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Hydraulic clamping elements for clamping of workpieces

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Hydraulic clamping elements for clamping of workpieces


Press release S005/2010
Sturdy swing mechanism
ROEMHELD continues the proved swing clamp line with numerous improvements


Highest flexibility offers the proved swing clamp line with sturdy swing mechanism that ROEMHELD continues now with again improved product characteristics. Different design changes have been made that lead to significant performance enhancing compared with the previous models.

The variant with flange at the top often used on the market is available in four sizes and enables high clamping forces with relatively low oil pressures. Also a use under difficult operating conditions is possible without any problems: Due to the sturdy swing mechanism without overload protection device the angle position of the clamping arm remains the same after a slight collision with the workpiece during loading or unloading. Also a collision during the clamping process is not critical.

Five different possibilities for position monitoring
Very advantageous for the universal use are the five different possibilities for position monitoring, a feature that is not offered by any other competitor. The complete control is made via the integrated pneumatic ports in the flange or - according to the request - by additional position monitoring possibilities that are available as accessories.

Due to this flexibility the double-acting swing clamps are especially suitable for the use in clamping fixtures with workpiece change by handling systems, in transfer lines, automatic manufacturing systems or special machine tools. This applies also to complete test systems for motors, gears or axes.

High process safety due to sturdy design
For high flow rates the swing speed of the new swing clamp is limited by installed throttle points. Due to the sturdy design and a strengthening of the material, now also operating pressures of max. 350 bar are possible.

Beside the standard FKM wiper at the piston rod, which has a high chemical resistance against aggressive cutting fluids, the swing clamp can be equipped with a metallic wiper. The metallic wiper protects the FKM wiper against mechanical damage especially in the case of heavy cutting operations.

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Press release S004/2010
Small and excellent
Hydraulic threaded-body work support from ROEMHELD with minimum dimensions


For very versatile production processes, optimum positioning and clamping nowadays are the requirements for high-quality final products. Especially for applications with limited space the newly launched threaded-body work supports of the market leader for hydraulic clamping systems ROEMHELD offers an excellent protection against vibration and deflection during the machining of the workpiece.

The single-acting work supports (M26 x 1.5), designed for a maximum operating pressure of up to 350 bar, have a thin-walled locking bush in their body that circularly locks the movable support plunger when pressurising the element. The minimum distance of the support points is 30mm. The interior parts are corrosion resistant and the hardened contact bolt is specially sealed. The standard metallic wiper edge and the FKM wiper provide for high process safety.

Three types of function
The ROEMHELD work supports offer three different procedures for the contact of the support plunger. The work supports can be used with spring pressure, air pressure or oil pressure combined with spring force. When using the spring force, the support plunger is maintained by spring force in the extended position. When inserting the workpiece into the fixture, the support plunger is pushed back and contacts the surface to be supported with spring force. If the workpiece is clamped, the increasing hydraulic pressure locks the support plunger and thus forces in axis direction can be compensated.

When pneumatically pressurised the support plunger moves against the already clamped workpiece. The contact force can be adjusted by means of a pneumatic pressure reducing valve.

When pressurised by hydraulic pressure, a little bolt extends and the support plunger contacts the already clamped workpiece with spring force. Due to the increasing hydraulic pressure the support plunger will be clamped.

The work supports must only be operated with a sealed contact bolt. Special versions can be realised in cooperation with the ROEMHELD experts.

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Press release S003/2010
Minimum space required space
ROEMHELD compact clamp opens clamping lever by 90 degrees


That's really ingenious – the patented system of the ROEMHELD compact clamp enables loading of the workpiece into the fixture independently of the lever length. A clamping recess in the workpiece a little bit wider than the clamping lever is sufficient as clamping surface.

Generally compact clamps are designed for application in hydraulic clamping fixtures where oil supply is effected through drilled channels in the fixture body. With the patented ROEMHELD system, the compact clamp requires only minimum space and is therefore particularly suited for clamping fixtures that allow only little space for the installation of hydraulic clamping elements.

Unimpeded loading and unloading of the clamping fixture
The hydraulic double-acting compact clamp, designed for a maximum operating pressure of 250 bar, is the only hinge clamp on the market that opens the lever by 90 degrees. In unclamping position the clamping lever is swung up so that the workpiece can be easily unloaded. Therewith the target of unimpeded loading and unloading of the clamping fixture is met.

Due to a defined vertical stroke, workpiece clamping without side loads is possible thus significantly increasing the process safety for the machining of clamped workpieces. That applies especially to test systems for motors and gears or the use in assembly lines.

Two different standard clamping levers are designed. Long clamping levers are adaptable to the workpiece.

The version with cover is inserted into open bore holes and enables the smallest possible building height. For versions without cover, a closed pocket hole is required. The respective pneumatic clamping monitoring of the clamping position is already a standard feature - just as the metallic wiper edge for the piston rod.

Four different sizes from 2.5 kN to 10.5 kN are available. Any mounting position of the compact clamps is possible. If special versions are required, the extensive process know-how as well as the long-time experience of the ROEMHELD experts are at the users' disposal in order to combine the different variants for individual applications.

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Press release S002/2010
For complicated geometries
Start for ROEMHELD swing clamps without swing stroke


Actually the principle is quite simple: The hydraulic swing clamp without swing stroke is a double-acting pull-type cylinder where a part of the piston stroke is used to swing the piston rod without axial stroke. This allows the clamping arm to easily enter in recesses that are only insignificantly higher than the clamping arm.

The ROEMHELD experts with their high potential of experiences now have realised in a technically perfect way, what sounds simple in theory . Where up to now clamping points have to be kept free for loading and unloading of the fixture, now also recesses can be used for clamping. The piston rod together with the clamping arm is rotated without axial stroke to the desired direction and after the completion of the swing motion above the clamping point the linear clamping stroke is effected. To make this principle a reality, a higher production expense and more interior components that are perfectly matched are required compared to traditional swing clamps.

Ideal for complex design workpieces
Especially for complex shaped cast parts or aluminium parts with complicated ribbing it is ideal, if no swing stroke is required. Besides the high process safety, there is a further time saving due to a clamping lever that can be swung into a recess. The demand for up to date fast loading and unloading of the workpiece to be machined is thereby met.

The swing clamp with its compact flange design and its maximum operating pressure of 350 bar is optionally available with clockwise or counterclockwise swing motion. The standard swing angle is 90°, but special swing angles between 20° and 70° are available on request as well. Also the metallic wiper that protects the standard FKM wiper against mechanical damage can be selected as an option. An electric or pneumatic position monitoring is optionally available.

The reinforced swing mechanism without overload protection device endures a collision of the clamping arm with the workpiece up to a pressure of 100 bar during the swing motion.

Focused on a high-precision fabrication and a way of thinking oriented at the customer, ROEMHELD has looked for a purposeful solution for clamping tasks and has implemented an application-oriented solution.

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Press release S001/2010
Brabant Components use ROEMHELD Know-How
"ROEMHELD brought the solution to the point"


First use of position-flexible clamps in the production of cast parts that are sensitive to deformations
For the Dutch company Brabant Components, a double-edged situation arose already in 2008.With every successful project realised by the specialist for casting of demanding parts out of different magnesium alloys as well as aluminium alloys, the requests of the customers, e.g. of the automotive industry, grew with every successful project – time pressure, part variety combined with increased quality standards. To sum up, there was an increasing risk in the manufacturing process, that the workpiece would be deformed during manufacturing or even would crack under these conditions. "A high-quality oil sump today must not only be absolutely tight. It is a complex workpiece, that also assumes auxiliary functions at the motor and serves different mounting components", describes production manager W. A. van de Ven the initial situation. Who intends in this situation to deliver exactly according to the customer's demand and does not want to fall behind with delivery cannot afford failures in its production.

Minimum displacement forces for optimum results
The excellent qualities of ROEMHELD in hydraulic power workholding were best well known to the Dutch. Both companies cooperated already successfully in an earlier project. After a joint analysis of the problems, the developers of ROEMHELD put their solution on the table. The new position-flexible clamp with separate locking port. The double-acting clamping element can precisely support and clamp the oil sump so that an optimum result is guaranteed with maximized production speed. "In addition, it had to be guaranteed that the roughness required for further processing is maintained at the workpiece edges. With their new clamping element, ROEMHELD brought the solution to the point. " praises Mr. van de Ven the target-oriented collaboration. A further advantage of the new clamp is the vibration-cushioning feature and the simultaneous holding force of 10 kN at an operating pressure of 250 bar. These were the preconditions.

Clamping application, precise conversion
The required adaptations to integrate the clamping element into the process at Brabant Components were easy. The design engineers selected the version with lateral hose guide for the hydraulics supply. These high-pressure hoses are connected to the U-shaped connection housing and to the clamping unit where in addition the use of compressed air protection is provided to effectively prevent the penetration of coolants. "We were in the position to fall back on the high experience potential of our specialists for the solution of this complex clamping task. So the workpiece support point, adjustable in four positions, was perfectly matched with the workpiece to be clamped, so that the double-acting hydraulic cylinder can optimally bring the clamping lever to its position, "Harald Rausch, sales manager at ROEMHELD, points out the signification of the know how gathered in many years. Once correctly aligned, the oil sump is firmly clamped "like a gripper", however can absorb machining forces in the pendulum area to avoid unintentional deformations at the workpiece. A second clamping circuit locks the clamp so that forces from all directions can be compensated. Instead of an additional clamping circuit, also a sequence valve would be suitable for this task.

The basic principle is flexibility
This workpiece clamping system for oil sumps first seemed to require a difficult special solution. With decisive consequences for the long-term precision and correspondingly also the amortization. Automotive suppliers of course include these factors in the development of new machining procedures. With the "floating clamp" of the ROEMHELD modular system the negative consequences of too rigid clamping had been taken into consideration and already in the first step of the development a multitude of later application possibilities were worked out. That reflects also the well-reasoned range of accessories and the flexible application possibilities of the clamping system. For a higher precision, long-life cycle and repeatability the connecting hoses are provided with a swarf protection and can be easily cleaned, thereby the negative effects even of abrasive swarf formation can be reduced. Regular lubrication reduces the displacement forces at the workpiece during clamping.

Up to date: fast loading and unloading
Altogether two of the new ROEMHELD clamps with inductive proximity switch are used in the present fixture solution. They ensure in a sensitive production process that constant results can be delivered, which correspond absolutely to the specifications. A potential that is very difficult to be found in the market at present. Besides the process safety, a further time saving is achieved by the clamping lever that swings into a clamping recess. Thereby a fast loading and unloading is possible. Due to these good ideas the specialist of power workholding in Laubach, Germany, could reach the international top. On the basis of high-precision production and a customer-oriented way of thinking, purposeful solutions are sought for clamping task and implemented with regard to the corresponding application.

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Press release S004/2009
ROEMHELD with a new generation of threaded-body work supports
Metallic wiper edge and stainless interior parts for higher process safety


Wear, above all caused by penetrating swarf or the use of aggressive coolants, often in connection with high pressures, presents today a central challenge for work supports with permanent load. A simple sealing ring cannot effectively protect the interior parts against damages in the long run. The corrosion will damage the mobile interior parts.

With the new generation of threaded-body work supports, develloped by the ROEMHELD experts in the Hessian Laubach and now introduced, exactly these problems can be solved. With a metallic wiper edge and the use of stainless steel for the interior parts the new work supports even resist strong loads, they are well sealed against penetrating fluids and prove to be extremely resistant to corrosion. A solution demanded by the market that will convince the users.

Optional sharp-edged orifice to adapt the maximum flow rate
The smallest version of the new work support is available in two sizes with a load of about 6.5 and 9.5 kN. The stroke is about 8 and 15 mm respectively. The proved threaded-body version saves space and prevents the appearance of vibrations or deflexions of workpieces. By means of the now optionally available sharp-edged orifice an adaptation of the supplied oil flow rate can be effected. Thus a flexible control and limitation of hydraulic fluids is possible. A significant improvement of the process safety is the result.

Easy to adapt and able to combine
The single-acting work support, whose contact force is minimized by a spring or can be pneumatically adjusted, can be combined with other clamping elements without any problems. It has to be considered that the work supports, in principle, are not suited to accept side loads and that the loads to be expected will remain within the range of use. For example in connection with a swing clamp, the clamping and load forces must be calculated so that sufficient reserves will still be available for the compensation of the machining forces. The maximum operating pressure is 500 bar; that enables their use for a wide range of applications in fixture building and power workholding.

If a special version is required, it is possible to look for an individual solution together with the ROEMHELD experts. The large know-how and the long-time experience of ROEMHELD offer a safe basis for customer-specific problem solutions - also with regard to the costs.

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Press release S003/2009
Proved Line of Centring and Clamping Elements
with Diameters of 25 to 250 mm


The new centring and clamping elements are ideal tools for the machining of workpieces made of cast iron, grey cast iron or aluminium die casting, but they are also suitable for the use in the field of component machining in testing lines. Workpieces which are clamped hydraulically by the new ROEMHELD clamps with centring function can be machined from all sides.
This new line designed by the market leader for hydraulic clamping systems is an optimum combination of a double-acting pull-type cylinder equipped with a segment clamping bushing, which is pulled by a tie rod over a fixed cone.

Workpieces with cast or machined bores, reliefes or break-outs, can be easily loaded to the fixture with the concentric positioning and clamping elements and concentrically clamped or positioned for machining. Due to this combination of 2 and 3-point elements the bore clamp is particularly suitable for centring and clamping of workpieces with smoothly machined bores with diameters from 25 to 250 mm and a support surface square to the hole axis for versatile applications.

The compact design, the high clamping force with high repetitive accuracy of clamping, a hardened support surface as well as further advantages complete the 2 and 3-point centring and clamping elements to be excellent tools. The maximum operating pressure is 250 bar.
The precise adaptation to the corresponding task is made by the selection of the different sizes and the correspondingly-adapted contact bolts.

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Press release S002/2009
New ROEMHELD Swing Clamp with Inductive Position Monitoring
Electrical monitoring of the clamping arm position is possible


With a maximum operating pressure of 500 bar and a reinforced swing mechanism without overload protection device the new ROEMHELD swing clamp with inductive position monitoring is particularly suitable for the use in clamping fixtures with automated workpiece change as well as automated manufacturing systems.
The well-proven line with sturdy swing mechanism enhanced by ROEMHELD experts now allows as well electrical monitoring of the clamping arm position. Protected by a cap and sealed against unexpected penetratation of coolants, the two inductive proximity switches are located in a nut. Both are connected to a common socket. One proximity switch signals the position "Unclamped", the other the position "Clamped". By customized and standard connections the interpretation unit can be easily connected for continuous control of the clamping arm motion.

Omission of the overload protection device increases the process safety
To increase the process safety, the line with reinforced swing mechanism was designed without snap-out overload protection device. During clamping the reinforced swing mechanism endures an unintended collision of the clamping arm with the workpiece up to a pressure of 100 bar. In addition the swing clamp is insensitive against high flow rates due to integrated orifices.

The new double-acting swing clamp with inductive position monitoring is available in two sizes. Any mounting position is possible. By using different clamping arms that are available as accessory, for every application the optimum effective clamping force can be obtained as a function of the operating pressure.

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Press release S001/2009
ROEMHELD presents new swing clamp line with sturdy swing mechanism
Higher clamping force and higher process safety


As conventional clamping element for clamping of workpieces ROEMHELD presents now its swing clamp line with sturdy swing mechanism. For the first design model of this line, which shall be completed in the medium term by further versions with higher clamping force, several design changes have been made that lead to a significant performance enhancing compared with the existing models.
By optimization of the piston material with high-tensile material also stronger clamping arms can be used with this line and thereby the performance of the sturdy swing mechanism can be used more specifically. This increases not only the long-life cycle of the product, but above all the process safety. The sturdy swing mechanism even endures a collision of the clamping arm with the workpiece at maximum operating pressure.

75 per cent higher clamping force
By up to 75 per cent higher clamping force compared with the comparable previous model, the new swing clamp can now be used better particularly for machining from several sides. Especially for clamping fixtures with workpiece change by handling systems, the new swing takes advantage as well as for its use in transfer lines, automated manufacturing systems, assembly lines or test systems as for example for motors, gears or axes.
Also the design of the standard clamping arms was adapted. Due to the reinforcement of the material the maximum operating pressure is now 350 bar. Thus higher clamping forces can be obtained with the same clamping arm length by increasing the operating pressure. Or for the same clamping force longer clamping arms can be mounted.

Pneumatic position monitoring and metallic wipers as option
The optionally-available pneumatic position monitoring allows the control of the swing clamp in the position "Clamped" by means of a spring-loaded control tappet. To operate the tappet a control vane has to be connected at the clamping arm.
Beside the standard FKM wiper, which has a high chemical resistance against aggressive cutting fluids, the swing clamp can be equipped with a metallic wiper. The metallic wiper protects the FKM wiper against mechanical damage especially in the case of heavy cutting operations. In order to quickly introduce these improvements into the production process, location hole and dimensions remain the same compared with the previous series so that a quick exchange is guaranteed. Only the length is a little bit increased due to the prolongation of the clamping arm seat and the piston rod.

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Press release R001/2008
Hydraulic high-pressure clamping elements improve significantly the efficiency of resources and energy of the manufacturer as well as of the users

The worldwide climate and environmental protection debate is now also of importance for the industry. High costs for energy and resources require particularly from the manufacturing industry new ways with regard to the efficient use of energy and resources. The medium-sized enterprise ROEMHELD located in Laubach (Germany) pioneers in this field by taking measures relevant to environment. However not only the cost efficiency, which takes centre stage of all efforts all times, but also the concern about the future of the sensitive environment get the company consciously think about the possibilities to optimise the production processes and the products with regard to a more efficient use of resources.

Keep an eye on the overall process
Already when developing new products, the efficient use of resources and a continuous improvement of the eco-balance are in the focus of all development efforts. As well the idea that the customer can save additional resources, when operating his installation, is of importance. And all that is made on the base of worldwide leading technical standards determined by ROEMHELD .
The savings behaviour up to now limited to the exchange of traditional bulbs by low-energy light bulbs and further simple measures is now extended step by step to individual processes of manufacturing and the later application at the customer's plant. Engineers and experts include the cost of ownership in their development ideas - and think until the end of a life cycle, the waste disposal.

Small steps or big jump?
It is certainly important to save 5 or 10 % when supplying production plants with heat, water, cold or light. Only the multiple use of water can result in significant savings. Every small step, also in the awareness of the employees, helps to approach the target of environment protection. However, the desired jumps in results are mostly only obtained by new conceptual designs and approaches.
At ROEMHELD this means to push through technologically demanding developments against the trend. Especially the Asian competition pursues the way to operate clamping systems with low pressures, ROEMHELD however selected a different constructional, technically more difficult approach and increased the clamping pressure up to 500 bar. The effects are amazing: the clamping elements with higher clamping force can be designed significantly smaller and small clamping elements save:
- steel for production,
- oil, since smaller hydraulic clamping elements require less filling quantity,
- energy, since due to smaller clamping elements the working area can be better used, the workpiece accessibility will be increased and consequently more working cycles can be effected in one clamping position and finally the production cycles are shortened and the total energy consumption is reduced.
- operating expenses, since less raw and auxiliary materials are required for operation.
- disposal costs, since less materials have to be disposed at the end of the life cycle.
The percentages of savings are remarkable: the high-pressure clamping elements have a construction volume up to 80 per cent smaller than clamping elements for low pressures. This means a drastically reduced material usage and less chip production required for the production of the clamping elements. The total energy balance from raw materials production and smelting up to the use of the finished product is improved by up to 40 per cent. And the customer has a further purchase-decisive advantage: with a far higher performance the high-pressure clamping elements are offered at a lower price than comparable low-pressure clamping elements. And this pays off. The demand for high-pressure clamping elements is pleasantly high.

Clamping power units in cycling mode save energy
The fact that the clamping systems can be equipped with clamping power units with turning off motors supports also the energy efficiency, even though for the time being cost saving and longer life of the motors were the main concern of the development engineers. But if the cost saving is finally also of benefit for the environment, this is of course a welcome secondary effect.

Sensitised environmental awareness should slip into all business processes
The possibility to look at the horizon instead of just at the issues of the own department helps to keep an eye on the overall process. This motivates individuals to stand up for the whole. ROEMHELD recognised that the care of the employees for the development of the environment can also result in improvements for the own production processes. The company will support this positive commitment in the future. Beside the expansion of the technological leadership of ROEMHELD , this commitment will lead to protect the customer’s energy and raw material resources and will result in direct savings.

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Press release S003/2007
ROEMHELD ’s consequent expansion for the supply of filters
New high-pressure filter with filtration at both sides


In the supply lines of valves and intensifiers there are frequently swarf and other dirt particles. To protect hydraulic elements against contamination normally screen disks are inserted in the filter elements. But quite often people refrain from a required filtering. However contaminations lead to malfunctioning of valves, cylinders and intensifiers and thereby to increased wear as well as increased costs.

As first supplier ROEMHELD launches at the EMO 2007 a bi-directional inline filter with significant advantages compared to the up to now widespread screen disks. For example there are considerably less operating expenses due to quick cleaning processes, since the filter has only to be flushed and reinserted. In addition, function safety of the installations and life are considerably increased.

Increased safety guarantees quick return on investment
The novel filter is also pressure-resistant up to 350 bar in case of complete clogging by dirt and allows a lower dynamic pressure at a given flow rate than traditional filters. The filtration at both sides – independent of the flow direction – saves additional costs for otherwise required tubing. The filter equipped with a stainless steel filter insert has a filtration performance of 10 µm and is also available as plug-in filter. At the EMO 2007 ROEMHELD presents for a start 3 versions of the new stainless steel filter generation:
- bidirectional manifold mounting filters with filtration independently of the flow direction
- a plug-in version for applications without tubing
- and a compact version for applications in limited space.

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Press release S002/2007
ROEMHELD Innovation ready for EMO 2007
Hydraulic sequence valve for series production


For the realisation of independent sequence controls in clamping fixtures the new patented hydraulic valve from ROEMHELD offers many new possibilities. The sequence system presented at the EMO 2007 allows the realisation of pressure-independent sequence controls without any faulty operation. So that unreliable and not constant sequence controls due to unexpected pressure variations are now a thing of the past.

Increased process safety – less costs
This valve composed by a base body with an integrated hydraulic piston and a mechanically-operated opening valve offers two adjusting possibilities for the adjustment of the temporary switching sequences: a throttle screw for the base setting as well as an adjusting screw for the precise adjustment. With constant hydraulic conditions a high reproducibility of the adjusted switching sequences can be obtained. This leads to a significant increase of the process safety, a minimisation of rejects and the avoidance of tool crash. In addition, costs for design and installation are reduced since less control valves and lines are required. The compact design facilitates the installation directly at the clamping fixture. This saves also time and money. Parallel or series connection of several valves is possible.

The valves are normally preadjusted to a system pressure of 150 bar and have to be adjusted only once to the hydraulic conditions with regard to pressure, viscosity and temperature.

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Press release S001/2007
ROEMHELD Innovation ready for EMO 2007
New patented coupling element without coupling stroke


In the complete machine tool and plant manufacturing sector coupling elements are required for the connection of hydraulic lines for very different manufacturing processes. With an innovative solution ROEMHELD presents now at the EMO a world novelty.
Docking elements without coupling stroke which have been designed especially for depressurised coupling and uncoupling of any sort of hydraulic lines. These automatically closing couplings do not have protruding elements for sealing and have a flat surface. An exact positioning is not required, since the system allows a radial positioning tolerance of up to 2 mm. Due to the space-saving exterior dimensions the new couplings can also be integrated extremely well in designs where limited space makes a standard coupling change difficult.

New liberties for the design
Thanks to the new design the coupling stroke is no longer required, whereby the possibilities of application are significantly increased. In addition, the danger of contamination is considerably reduced due to the flat surfaces. The cleaning process is easier. Furthermore wear of the sealing rings is minimised. With this element a functioning coupling system with a maximum operating pressure of 200 bar is now for the first time on the market. Design limitations known until now cease to exist and new possibilities of application arise.

The threaded-body coupling elements without coupling stroke are available as a version with reduced spring force and as a version with standard spring.

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Press release S005/2006
Minis with maximum clamping force
Worldwide the smallest swing clamp and hinge clamp from ROEMHELD


Also in the field of hydraulic swing clamps and hinge clamps, which are used for clamping of workpieces, that require free clamping points for loading and unloading of the fixture, miniaturisation proceeds continuously.
With the worldwide smallest hydraulic mini swing clamps and hinge clamps from series production ROEMHELD, the market leader for hydraulic clamping systems sets new standards in the field of dimensions. Despite of their compact dimensions the new minis meet all technical requirements as their big brothers.

Above all on swivel fixtures in multi-axle machining centres the mini swing clamps excel by their space advantage. The threaded-body swing clamp has a flange diameter of approx. 26 mm and a piston rod diameter of only 6 mm and a clamping stroke of 8 mm. Despite of their narrow and very low design they are double-acting and guarantee thereby the same high process safety as the bigger versions. Especially in the case of machining from several sides the investment pays off very quickly by saving of several clamping processes. In order to expand the possibilities of applications, all swing clamps can optionally be equipped with clamping arm or clamping arm assembly. The minis are available with clockwise and counterclockwise rotation.

By launching the actually smallest hydraulic swing clamp on the market, ROEMHELD not only emphasises strongly their leading position in the field of hydraulic clamping elements, but influences decisively the development of the market by pathbreaking innovations.

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Press release S004/2006
Highest safety even in case of pressure drop
ROEMHELD presents a new hydraulic clamping and supporting element with round body


Even in case of a pressure drop in the hydraulic system the workpiece to be machined will remain clamped firmly and safely with the new, cartridge-type clamping and supporting element which has been presented recently by ROEMHELD. Due to the special design with wedge-shaped cross piston, it will be avoided that the clamping piston will be pushed back – as in traditional clamping elements – if the machining force is higher than the hydraulic clamping force. The geometry of the clamping and supporting element with a maximum operating pressure of 300 bar, that is up to now unique on the market, is designed with self-locking function.

This element designed especially for machining from multiple sides opens up a significant saving potential besides a high process safety. Where up to now several individual clamping processes had to be effected, today a single clamping process can be sufficient. Especially in cramped installation conditions the new round design of the market leader for hydraulic clamping elements brings all its strength to bear.

Re-clamping with hydraulic pressure
If the workpiece yields during the machining process or the contact bolt digs deeper into the material due to machining forces or vibrations, the maintenance-free, double-acting clamping and supporting element re-clamps with the existing hydraulic pressure. Especially for automated applications, where high process safety is demanded, this is a decisive argument for investment. Forces which are directed against the clamping force – for example machining forces - will be supported with a negligible elasticity of the wedge-shaped piston.

At the moment there are three different types on the market. The cartridge type allows direct installation in the clamping fixture in horizontal or vertical position. This facilitates a space-saving arrangement that is of advantage in case of critical installation conditions. In addition, also extended piston rods with inductive or pneumatic position control as well as built-in housing or intermediate plates for height adjustment are available.

Besides the new round design, the double-acting clamping and supporting element is already available in traditional design, which offers also all advantages of the innovative series.

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Press release S003/2006
More scope for the design engineer
New development from ROEMHELD: Fixture clamps for automatic operations


The target for development was well-defined: A fixture clamp for automatic operations should be designed, which can be used repeatedly as design element for small and medium lot sizes.
ROEMHELD presented the recently convincing result: A fixture clamp for automatic operations as standard clamping system for fixtures. Due to its simple integration in fixtures or mounted on a plate for quick changes, the clamp is launched onto the market in three types – with fixed jaw, concentric or position flexible.

The narrow design with a jaw width between 40 mm and 65 mm a high accessibility from all sides is guaranteed. The jaw guide results in a high rigidity. Now an ideal clamping system – double-acting and with high clamping force – is available to standardise a little bit the present special fixtures. Exchangeable clamping jaws increase the flexibility for applications. An optimum swarf protection and discharge of coolants provide correspondingly long service life.
The type “fixed jaw” with an additional air connection allows a workpiece contact control or blow off of the jaw support.

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Press release S002/2006
Clamping and centring with one element
ROEMHELD presents a new bore clamp with centring function

Workpieces which are clamped hydraulically by the new bore clamp with centring function from ROEMHELD can be machined from all sides. This bore clamp designed by the market leader for hydraulic clamping systems is an optimum combination of a double-acting pull-type cylinder equipped with a segment clamping bushing, which is pulled by a tie rod over a fixed cone.

Due to this combination the bore clamp is particularly suitable for centring and clamping of workpieces with smoothly machined bores with diameters from 16 to 46 mm and a support surface square to the hole axis. The sectioning of the complete clamping range in 5 sub-ranges allows an optimum adaptation of tie-rods, conus and workpiece support. The maximum operating pressure, with a very high low-clamping force in each case, ranges from 50 to 350 bar. Oil supply is possible through connecting threads as well as drilled channels.

The compact design, the high clamping force with a repetitive accuracy of clamping of 0.005 mm, standard FKM seals, a hardened support surface as well as further advantages complete the bore clamp and due to these features the bore clamp is an excellent tool for numerous clamping applications in the field of machine tool constructions.

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Press release S001/2006
New and manifold use
ROEMHELD presents the first size of the new hinge clamp series

ROEMHELD, market leader for hydraulic clamping systems, presents with the new hinge clamp equipped with standard metallic wiper the first hydraulic clamping element of a four-part series, which will be completed by further sizes in the near future.

The hinge clamp size 1, placed in a favourable price segment, excels by its numerous installation and connecting possibilities as well as a maximum operating pressure of 250 bar. Loading and unloading of the fixture is made with retracted clamping lever, which can be adapted to the workpiece; the clamping lever mechanism is easy to clean. Small recesses or ribs in the workpiece to be clamped, which are only a little bit wider than the clamping lever, are sufficient as clamping surface.

Clamping without side loads avoid deformation of workpieces
When pressurising the element, the piston moves upwards and swivels the clamping lever over the hinges forwards and at the same time downwards onto the workpiece. The piston force is deviated by 180° and is available as clamping force with virtually no loss of efficiency. The special kinematics allows clamping nearly without side loads of workpieces which are very sensitive against deformation. For example in case of sensitive aluminium parts a workpiece deformation will be avoided.

The big variety of variants as well as the compact design with high clamping force offers the engineer numerous possibilities to integrate the ROEMHELD hinge clamp in its own design. For further automation optionally also inductive or pneumatic controls of the unclamping position and the clamping area are offered. This allows the perfect use of the new hinge clamp in series production for example with aluminium machining.

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Press release S004/2005
New at the EMO - Clamping with the claw
ROEMHELD presents the extended family of position flexible clamps


A completely-new designed position flexible clamping claw is presented by ROEMHELD, market leader for hydraulic clamping systems, at the EMO 2005 from September 14th to September 21st in Hanover.

With this new clamping claw the family of position flexible clamping systems of ROEMHELD is consequently completed. The systems are particularly used in the automotive industry and by their suppliers, by manufacturers of components, in machine tool construction and by wage processors for supporting and clamping of unstable workpiece sections. They adapt themselves to the position of the clamping point without deforming it and ensure thereby reproducible machining processes.

In the case of the position flexible clamping claw the piston force is available as clamping force with virtually no loss of efficiency, since the force is deviated by 180° by the clamping lever. The kinematics of the clamping lever are designed so that the clamping lever can swivel back behind the front edge of the element when unclamping the workpiece and thereby new workpieces can be inserted without any impediments for machining.

Less re-machining = significant increase in productivity
Especially in case of very unstable workpieces deformations can occur by the contact of traditional support bolts. After final clamping not acceptable tolerances occur at the workpiece. Using position flexible clamping elements only very low displacement forces act on the workpiece. In addition the workpiece support point is adjustable and can be mounted in 4 different positions. This offfers the highest possible flexibility for adaptation to very different workpiece geometries and for compensation of machining forces. This effect is also supported by a separate port for the locking function. Thereby the interior housing which has been designed „with floating effect” can be adapted in the pendulum range of the clamping element to the workpiece. Then machining forces from all directions can be compensated.
By an additional check air connection ingress of swarf and coolants will be avoided. Therefore the life and sensitivity of the clamp are increased.

With the extension of their family of position flexible clamping elements ROEMHELD emphasises their leading position in the range of hydraulic clamping elements with an innovative novelty: the position flexible clamping claw.

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Press release S003/2005
No interfering cross forces by ROEMHELD swing clamps with pendulum eye
More process safety by reduced workpiece deformation


An element which up to now was only available as special design, ROEMHELD, the market leader for hydraulic clamping systems, offers now a standard series product to their customers: a hydraulic swing clamp with so-called pendulum eye for simple mounting of a pendulum clamping arm.
Using this swing clamp workpiece deformations due to cross forces during clamping are nearly completely avoided. Especially for workpieces, where the clamping points must be free for loading and unloading of the fixture, the system which is ready for series production offers numerous advantages.

Significant time savings by simple handling
The design with pendulum eye allows simple mounting or dismounting for workpiece change and offers thereby a considerable time saving compared with previous processes. Due to the pendulum eye in the piston rod of the swing clamp the pendulum clamping arm can be quickly and easily mounted. The vertical force introduction due to the support within the fixture or a second workpiece avoids cross forces and workpiece deformation at the clamping point. The very solid swivel mechanism has been designed for very short cycle times and the version with extended piston rod allows also pneumatic or electrical position monitoring. Beside the standard FKM wiper the optionally available metallic wiper increases significantly life especially in cutting processes.

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Press release S002/2005
Position flexible clamp from ROEMHELD ideal for difficult clamping tasks
Flexible and low-cost solutions for clamping of unstable workpieces


For every design engineer the avoidance of deformations due to clamping of workpieces is quite often a challenge which is very difficult to realise. Especially the increased use of aluminium or thinner-walled workpieces because of weight or costs require often an expensive special design to get optimum conditions for workpiece machining. Especially for the solution of such tasks the actually unique clamping system of ROEMHELD, the leader for hydraulic clamping systems, is of advantage.

The inclusion of special designs saves time and costs
Special solutions for supporting and clamping of unstable workpieces up to now normally time-consuming and expensive are a thing of the past. The solution is the position flexible clamp of ROEMHELD: a small vice with two movable jaws, which are operated by a common hydraulic port. The workpiece will be clamped nippers-like (floating), independently of its position within the clamping area. The jaws adapt to the position of the clamping point by interior as well as exterior clamping without deforming it. In addition the clamping jaws act at the same time as cushioning of vibrations and compensate machining forces from all directions. This guarantees a high repeatability of machining process with low tolerances - the decisive extra process safety. According to the machining task even a complete additional workpiece clamping can be saved. Due to its compactness a better accessibility to the workpiece is possible. This facilitates for example cutting and thereby cleaning processes. For the user there is the further advantage that ROEMHELD standard jaws can individually be adapted to the corresponding application of the customer.

Cooperation in the design period offers process and cost advantages
ROEMHELD, the leading company in the field of hydraulic power workholding for metal-cutting production engineering, offers its customers, cooperation during the design process. This allows the realisation of decisive process and cost advantages for the customer from the beginning.

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Press release S001/2004
Innovative wiper systems increase life of hydraulic clamping elements
New ROEMHELD concept for more process safety


Modern production processes make highest demands on the used tools and cooling lubricants in workpiece machining as well as on the elements for workpiece clamping. Only sturdy and functional components with long life guarantee optimum and smooth processes in workpiece clamping. Römheld GmbH, Laubach (Germany), worldwide leader in the market for hydraulic clamping technics, presents new wiper systems for swing clamps and work supports.

Newly-designed metallic wiper also for HSC processes and dry machining
Hydraulic swing clamps used for clamping of tools are considerably loaded by high machining speeds and chemically corrosive coolants with pressures up to 70 bar. Also hot swarf, which accumulate during dry machining and burn in, damage the material. All hydraulic clamping and supporting elements, which are normally located directly in the swarf area and are exposed to coolants, have to be equipped with a wiper which avoids penetration of swarf and coolants into the piston rod guide.

Double protection prolongs life
ROEMHELD presents for its swing clamps a new metallic wiper, which in combination with the already available standard FKM wiper offers an almost complete protection against external influences and thereby takes into account the increased demands for workpiece machining.
The new metallic wiper consists of a hardened, sharp-edged wiper disk with radial compensation, which counteracts the eccentric load of the piston rod of the swing clamp. This guarantees a perfect contact of the wiper disk in each piston position. This metallic wiper deflects the largest part of the coolants and swarf. The standard FKM wiper mounted below the new metallic wiper avoids additionally the penetration of liquids.

Wiper for work supports also for retrofitting
Also work supports can be equipped with a new wiper system. A brass wiper especially developed for this application offers a good mechanical stability as well as resistance to aggressive coolants by an integrated FKM wiper. Its exterior roof-shaped contours provide an immediate drain off of coolants and avoid the formation of pools. Work supports which are already in use can be retrofitted with the new wiper system at the manufacturer's workshop.

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Hydraulic cylinders for linear motions of every type






Clamping and industrial power units | Hydraulic pressure generators


Press release A002/2005
Mobile test bench from ROEMHELD for higher process safety in fixture building
Considerable time and cost savings available using hydraulic clamping fixtures


For fixture building in the metal processing industry function monitoring of hydraulic clamping fixtures was up to now connected with time and cost consuming inspection efforts to be carried out before delivery to the customer.
With a mobile test bench, particularly for hydraulic clamping fixtures, ROEMHELD offers the conditions for significant cost and time savings in case of increased process safety. Quick and cost saving tests of pressure loss as well as long-term tests with optimum filtration of the displaced oil volume can be effected with every hydraulic fixture equipped with up to 12 passages and a maximum pressure of 250 bar. The function sequence will be programmed by the operator himself. User guidance and the use of extended functionalities are effected by a touch screen.

New test system unique on the market
If up to now individual pressure generators have been required and thereby individual functions had to be triggered and checked, the ROEMHELD test bench simulates all required functions. The corresponding sensor mechanism as stroke end controls or pneumatic monitoring are also considered in the test run. Up to now this system is unique on the market.

For fixture builders as well as for end users for example in the automotive industry the new system offers clear advantages: The individual construction of expensive test fixtures is no longer required. Beside these immediately effective cost savings also the required time will be considerably reduced. In addition manufacturing processes will run safer. Machine failures due to errors in the fixture will be decisively reduced and thereby cost-intensive re-machining will also be reduced. If very different fixtures will alternately be used, the new investment will pay off particularly quickly, since the expense will be limited to an indispensable minimum by the new text bench of ROEMHELD.

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Press release A001/2004
Simple and safe: New power unit with two-hand control from ROEMHELD
Reworked hydraulic control with 4/3 directional control valve (poppet type) provides more safety in clamping and forming processes with operating pressures up to 500 bar


With new power units equipped with two-hand controls ROEMHELD makes an active contribution to occupational safety when using hydraulic fixtures for power-operated processes as workpiece clamping, forming, punching, and pressing. Power units with two-hand control are used if there is a risk of injury for the operator during the motion cycle of hydraulically-operated fixtures.
According to the functions the hydraulic control used up to now required up to four hydraulic valves, which have been replaced now by only one 4/3 directional control valve. Without any tubing the poppet type 4/3 directional control valve is mounted directly to a newly-designed valve block. This valve block has been designed so that pressure switches as further hydraulic control elements can also be mounted directly on this block. Due to their optional arrangement different functions can be easily obtained.

An adaptation of the two-hand controls allows also easy realisation of manual coupling processes. The maximum pressure range of power units is up to 500 bar. Due to the reduced number of hydraulic valves and their connecting elements the power unit has a simple and function-safe design, which guarantees highest process safety and optimum protection of the operator.

Reduction of components offers further advantages
The reduction of components does not only provide safety-related advantages. First, the space required for the hydraulic control elements will be reduced. The reduction of components becomes also apparent with regard to the costs. In addition the expenses for mounting are reduced, since no tubing is required. A further advantage for the customer: a reduced purchase price.

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Assembly and handling technology


Press release M002/2005
The new modular system of ROEMHELD increases the efficiency in assembly technics
Combination of standard components creates multiple possibilities for the fixation of workpieces


Assembly processes in machine construction can be reduced to a few basic operations even with very different products. Based on this knowledge ROEMHELD, a leading company in the field of power workholding, has developed components in the form of handling modules, which can be used to cover most of the operations to be carried out.

For manual assembly of products for machine construction a fitter requires besides aids for lifting and lowering, rotating, swivelling, tilting and passing on above all support for the fixation of workpieces. For this purpose the subassemblies and individual parts to be connected have to be brought to the most favourable position for assembly. The modular system of ROEMHELD with its multitude of element supports the fitters decision in the required working steps and thereby reduces considerably the process times as well as the physical load for the operators.

Higher efficiency especially for piece production, small or mid-sized batches!
Piece production, small and mid-sized batches require frequent changes of assembly tasks. In order to be in the position to cope also in this field with the increasing cost and time pressure, the use of multiple useable and flexible installations is inevitably required. With the ROEMHELD modular system costs for expensive special designs are considerably reduced.

If in the progress of assembly the product to be moved and positioned becomes bigger and heavier, there is in addition the requirement to use ergonomically optimized, flexible and economically favourable installations for the handling. ROEMHELD has considered this, during the development and planning of new handling modules.
The customers have to provide the possibility for fixation of assembly units. This can be geometrical interfaces like T-slots or bore holes, but also pneumatic or hydraulic clamping elements, so that e.g. swing clamps, work supports and block cylinders can be used to support the manual action of the fitter. If several operations will be combined in a more complex assembly installation, additional standardized coupling points are required.

By involving ROEMHELD in the planned assembly processes, the foundations are laid to meet all demands for efficiency, high quality of the end products, safety and at the same time ergonomic working in machine construction.

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Press release M001/2004
Sensitive control of high forces
Buffer fabrication for railway applications with complex hydraulic control from ROEMHELD


When mounting railway wagon buffers very different push and pull forces have to be controlled to connect the different process steps without problems. This is in the end the condition for an ergonomic and quality-oriented assembly. A special challenge are the nested compression springs, whose high spring forces have to be kept constant, to make the process reproducible.

Individual solution for press technique
The expert for assembly and handling technics ROEMHELD, Laubach (Germany), offers solutions for this application, which provide with an electro-hydraulic control a constant speed during extension and retraction. This process has to be effected without jerks, otherwise the assembly process will be much more difficult. The occuring forces vary in a range of 1 to 50 kN.
This solution engineered by ROEMHELD, especially for the demands of the buffer fabrication, guarantees the transmission of enormous forces, but also a very sensitive cylinder operation in all load steps. The return forces of the compression spring are kept constant. For the assembly a considerable relief, which saves time and makes the process calculable. Especially for such complex applications the specialists of ROEMHELD deliver individually adapted clamping systems, which offer more than only the transmission of the required forces to the respective components.

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Linear actuator technology


Press release L001/2004
Multi-function bed with ROEMHELD actuation technics revolutionises decubitus prophylaxis
New principle takes care of patients and relieves nursing staff when moving patients to another position is required


The traditional methods of decubitus prophylaxis will be soon a thing of the past. Where today patients are put from the back position in one of the two side positions, a multi-function bed of RoPa Technics B.V. Netherlands, with actuation technics of ROEMHELD will give considerable relief.

Putting into another position will be made by an intermittent, electronically-controlled inclination of the complete bed overlay. According to the principle of the inclined plane a continuously changing point load of the patient will be obtained in a stable back position. The adjustable angel of inclination up to max. 12° in the respective side position as well as definable interval times for changing the position allow a maximum adaptation to the state of health of the patient. The nursing staff will thereby save valuable time, and also the physical load for nurses and patients will be considerably reduced.

High safety and reliability due to many years of know-how
Manufacturer of hospital and nursing beds trust for more than 30 years regarding the selection of actuation and control technics for their beds in the reliability and the high safety standard of the products of ROEMHELD.
The manufacturer of electro- and hydro-mechanical linear units also supplies actuation and control technics for the adjustment of inclination at operating tables as well as height, back rest and foot rest adjustment at delivery beds and gynaecological chairs.

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System solutions for production engineering





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