FEATURE ON WORKHOLDING

Simplifying gripper configuration and integration

The task of configuring bespoke vacuum gripper systems that will meet the specific requirements of individual applications has never been easier thanks to the comprehensive digital configuration services now available from Schmalz. This range of digital services helps end users, machine builders and system integrators to achieve quick configuration of products such as Schmalz SLG lightweight gripping systems for individual applications. Tools such as filters, configurators, ordering aids and apps simplify the process – regardless of the stage of the project, whether it’s product design, procurement or operation.

A simple and highly intuitive six-stage process guides users through steps such as: selecting the workpiece; defining the application; selecting the type, number, size and positions of vacuum cups; and finally choosing a vacuum generator and robot mounting flange. The proposed SLG lightweight gripper then generates automatically and is shown in 3D on the basis of users input and responses to this series of intuitive choices.

At the end of the process, a summary of all of the information used to specify the gripper is available for download, together with valuable information for the end user or machine builder covering gripper dimensions, weights, air flow and gripping force.

Additional digital services available from Schmalz make it possible to simulate your handling process with a digital twin of the products selected, and test the function of the system long before it is actually built. For example, it is even possible to obtain information about the behaviour of a suction pad in its operational state. There are also a series of software and function modules that help integrate Schmalz products even more quickly into the end user’s process and control system.
For further information www.schmalz.com

Robot tool changing transformed

Whether it is for a high payload robot changing spot welding guns in the automotive sector, or smaller robot systems performing multiple handling or assembly operations, today’s tool-changing technology makes it possible to maximise robot flexibility.

Stäubli says that its MPS series robotic tool changers increase productivity for robots in all payload categories from all major manufacturers. Compared with the limited functionality of early-day tool changers, Stäubli’s latest-generation systems offer numerous different modules for the transmission of pneumatics, vacuum, signals, data transmission up to 10 Gbit/s, shielding, earthing, RFID tool coding and data storage.

The ability to combine these different technologies and modules makes it possible to configure a solution for a wide range of applications. Notably, the location of the transmission modules is highly flexible, allowing users to position them as required to suit the individual robot’s cable package. The robot-mounted component of the MPS tool changer incorporates all the services required to provide functionality for the various tools that the robot might use in production. On the tool-change element, the only transmission modules required are those relating to the operation of specific tools, which makes it possible to use multiple, individually configured tool elements with one robot mounted element, optimising the return on investment.

Cross-shaped guide surfaces combined with a spring-loaded ball locking system facilitate interconnection between the robot and tool sides of the MPS tool-changer system. This feature makes it possible to maintain the highest levels of precision throughout its entire product lifecycle. The tools always return to their original insertion position with a repeat accuracy of ±1.5 µm.

Stäubli tool-changing systems are available for robot payloads up to 1530 kg.
For further information www.staubli.com

ROTA THW3 receives design award

The ROTA THW3 flexible-jaw quick-change chuck from Schunk manages a balancing act between short set-up times and low maintenance. Its overall package of functional design, flexibility and sustainability also convinced the jury of the iF Design Award 2022.

Idea, form and function – these were just some of the criteria used by the design experts to determine this year’s winners of the iF Design Award. Aesthetically, the ROTA THW3 jaw quick-change chuck achieved high marks with its optimised outer geometry and fewer interfering edges. However, it was the chuck’s function that impressed on multiple levels. Schunk has cut down on weight in the product design, which helps to reduce energy input and enables faster acceleration and braking behaviour of the lathe. Nevertheless, the lathe chuck still has a highly rigid base body that ensures process-reliable clamping, even under maximum stress. Equipped with a quick-change jaw system, the ROTA THW3 can be quickly converted for a new range of parts and has a jaw repeat accuracy of <0.02 mm. In addition to its functionality, the jury was also impressed by the sustainable focus of the clamping device. Patented sealing has allowed cleaning and maintenance intervals to be up to 20 times longer than with comparable products, reducing the use of lubricants, cleaning agents and water, and helping to protect the environment. By using resources sparingly, it makes a successful contribution to sustainable production while ensuring optimal functionality. For further information www.schunk.com

New products from Roemheld

At the MACH 2022 exhibition last month, Roemheld showed for the first time in the UK a new, modular, sensor-based system that digitalises zero-point clamping by enabling the digital recording of its status. STARK.intelligence enables data on workpiece loading and unloading to be integrated directly into an automated manufacturing process. Information is also provided on the condition of the clamping equipment to facilitate its scheduled maintenance.

Each fixture is equipped with its own sensor box to measure position, temperature and pressure in real-time. A master unit receives data from several units and outputs the information to different devices via IO-Link. The device can be the machine tool’s control screen, computers in the quality assurance department or the service engineer’s smartphone.

It is possible to combine STARK.intelligence with various STARK zero-point clamping systems; it can retrofit easily to machine tables and quick-release fixture plates. Due to its modular design, users are able to choose between individual components or a complete solution, which may include the integration of an RFID interface that automatically detects pallets and workpieces.

Another introduction at the show was a range of compact bore clamps with a large clamping range for five-sided machining. The devices hold internally, exerting force both radially outwards and downwards against a support surface. The new models enable safe location in bores from 5.2 to 13.7 mm, so are suitable for clamping small workpieces. Bore size can be adjusted easily through interchangeable bushings while the clamping element remains in its fixture.
A third innovation at the exhibition was a compact flat-lever clamp designed for use on fixtures in machine tools with low-pressure hydraulics between 70 and 120 bar.

For further information
www.roemheld.co.uk

Wireless, intelligent clamping jaw

Röhm’s new iJaw clamping jaw allows the clamping force to be measured in real time during machining. The company says it therefore solves a problem for which there has been no accepted industrial solution up to now: that the correct setting of clamping force relies on operator experience.

Errors during machining due to incorrect clamping force or workpiece loss are thus pre-programmed. The Röhm iJaw integrates sensor technology for clamping force measurement, as well as wireless data transmission. Measurement takes place directly at the clamping point to the workpiece; data transmission to a gateway makes use of the upcoming industry-standard IO-Link Wireless. The gateway can connect to the machine control system via the integrated PROFINET interface and/or send the data to a cloud via the integrated LAN interface.

“We’ve identified seven very different scenarios in which the iJaw offers significant added value,” says Claus Faber, head of product management and marketing at Röhm.

The first three scenarios are about the ‘feeling’ before and during machining. Before machining, iJaw assists in feeding workpieces and setting up the clamping system. If errors occur, the measured clamping forces deviate from the target values and a manual or automated reaction can be initiated. During machining, clamping forces that are too high (risking workpiece damage) and clamping forces that are too low (insufficient to hold the workpiece) can be detected.

Further scenarios offer solutions for the evaluation of series and serial measurements. Here, the changing of clamping forces can be used to detect trends at an early stage. This includes the early detection of upcoming maintenance to maintain the clamping force or the wear of tools.

For further information
www.roehm.biz