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Convenient Clamping By Magnet

Convenient Clamping by Magnet

Here are some of the latest developments in magnetic clamping technology. Article by Schunk.

The clamping status of the SCHUNK MAGNOS square pole plates is displayed on the patented status display (green). The status can also be monitored and transmitted to the machine control system via the SCHUNK KEH plus control unit.

The electrically activated permanent magnetic clamping technology is considered an insider tip when it comes to reducing set-up time and low-deformation clamping of workpieces. With a bit of design finesse, even large-sized components can be clamped deformation-free in a matter of seconds and machined from five sides. Even in the field of standard modules, development is not standing still: Modern magnetic chucks allow visual or automated monitoring of the clamping process.

The secret of deformation-free workpiece clamping by means of a magnet lies, on the one hand, in the movable pole extensions and, on the other, in the optimized interfering contours. Comparable with a waterbed, the movable pole extensions flexibly attach to the workpiece in the case of electrically activated square pole plates and compensate for workpiece unevenness in the first set-up. Ferromagnetic raw parts can be clamped in this way deformation-free and machined in a single operation from five sides.

READ: Grippers for Collaborative Applications

In the second set-up, workpiece smoothness that cannot be achieved with any mechanical clamping device is possible: plane parallelism of up to 0.02 mm is not uncommon in practice. Unlike conventional set-ups with chuck jaws or clamping claws, punctiform damage and workpiece deformation are avoided. Instead, users benefit from maximum clamping precision and achievable workpiece smoothness. This advantage comes into play especially with large-area steel plates or other deformation-sensitive workpieces.

Clamping over a large surface area minimizes vibrations, and protects the machine spindle as well as the cutting edges. Operation is very simple: the ferromagnetic workpiece is placed on top and the magnetic chuck is activated by a short current pulse. Within a few seconds, the permanent magnet ensures a long-lasting secure hold, without the need of further energy input.

Magnetic Chucks Report the Clamping Status

Figure 3: The SCHUNK MAGNOS force measuring system detects both the position of the workpieces placed on the magnetic chuck, as well as the respective clamping force. The technology study shows what intelligent magnetic clamping solutions will do for industry 4.0 in the future.

On such technology is SCHUNK’s MAGNOS square pole plates, which are now equipped with a patented status display that permanently signals the current clamping state—even if the magnetic chuck has been decoupled from the control system. This leads to zero operating errors and increased process reliability. With this technology, the machine operator always has full control no matter if the magnetic chuck on the machine table has been activated.

READ: Gripping and Clamping Solutions for Process Automation

Another aspect is that the higher the degree of automation, the more frequently magnetic chucks are now pre-equipped, and stored like pallets in workpiece storages. Using the display, machine operators can now check at any time whether all magnetic chucks in the tool rack are properly activated.

Automated Clamping Procedure

SCHUNK also pursues the idea of simple control and monitoring of the clamping state in the modular control unit SCHUNK KEH plus. Depending on the basic version, one, two, four, or eight square or radial pole plates can be controlled with it—either directly or by using connection boxes via the control unit. The control unit provides information about the current clamping status of the magnetic chucks at any time. A 16-step holding force regulation process facilitates the alignment of the workpieces and allows the clamping of thin components.

READ: Miniaturisation In Clamping Technology Thanks To Additive Manufacturing

In addition, the magnetic chucks can be operated in automated applications via 78-pin PLC connection directly from the machine control system. To ensure process reliability, a detailed monitoring of each magnetic chuck is possible. To do this, the individual clamping state is transmitted via a PLC interface to the higher level plant control. The hand remote control SCHUNK MAGNOS HABE KEH plus, in turn, allows convenient manual control of up to eight magnetic chucks as well as their individual, 16-step holding force regulation. The control continuously provides information to the operator on the individual clamping status of the connected magnet chucks via LCD display and LED. Faults are shown on the display in the form of error codes.

App for Simulating the Clamping

Via an app that SCHUNK will soon provide for iOS and Android, registered users can simulate different clamping situations on SCHUNK MAGNOS square pole or radial pole plates free of charge. For this, only the basic data on the workpiece, the cutting parameters and the type of magnetic chuck have to be entered; the app already determines whether the holding forces are sufficient for machining. With the digital tool, SCHUNK enables a very fast assessment of machining operations. In addition, users can fully use the potential reserves of magnetic clamping technology.

Intelligent Magnetic Chuck with Force Measuring System

Figure 4: Using the SCHUNK MAGNOS HABE-S plus handheld remote control, SCHUNK MAGNOS magnetic chucks are particularly easy to actuate. The current clamping status is automatically displayed. The adhesive force can be set to 16 positions.

The SCHUNK MAGNOS force measuring system takes a significant step towards smart manufacturing. The intelligent magnetic clamping solution automatically records the respective position and size of the workpieces placed on the magnetic chuck, and determines the precise individual clamping force, thus, creating the precondition for continuous process monitoring as well as for automatic adaptation of the machining parameters to the size and quality of the individual workpieces. This means that in the future, the feed rate or the cutting speed can be increased on an individual basis with a large pole cover and high clamping force, or, in the case of low pole covers or low-ferromagnetic workpieces, can be reduced in such a way that process-reliable machining is ensured.

READ: SCHUNK Launches Powerful 24V Grippers For Small Components

Potential fields of application of the system include the processing of small and medium batches with automated parts handling, as well as machining operations where extensive process monitoring is required. The system paves the way for first-class, highly transparent, and flexible networked processes for Industry 4.0.

Magnetic Gripper for Machine Loading

When it comes to automated loading and unloading of machine tools, the importance of magnetic grippers with electro-permanent magnets has significantly increased. Reasons for this are the high power density and energy efficiency as well as the decidedly favourable interfering contour for handling.

The SCHUNK EGM series is designed for systems with a voltage range of > 400 V. Even the smallest size (26 mm x 98 mm) of the compact SCHUNK EGM-M monopole gripper is suitable for handling parts up to 7 kg. As the magnetic surface reaches right to the outer edge, no interfering contour needs to be taken into account. The SCHUNK Bipol grippers EGM-B, meanwhile, is designed for handling heavy and complex ferromagnetic parts, which are available with either one, two or four pairs of poles in different arrangements.

READ: SCHUNK Releases Versatile Clamping Module For Automated Machine Loading

Under ideal conditions, the EGM has gripping forces between 1.2 and 22.5 kN, depending on equipment, and is designed for maximum part weights up to 147 kg and material thicknesses from 3.5 mm. The compact SCHUNK EMH magnetic gripper is designed for systems on 24 V basis: as the electronics are completely installed in the gripper and it is actuated extremely easily via the digital I/O, the components require neither space in the electrical cabinet nor an external control electronics system. In order to increase process reliability, the gripper reports both the magnetization status and the workpiece presence. At the same time, errors are signalized via an LED display on the housing. Unlike magnetic grippers, no maintenance time between activations is required, meaning high cycle times can be achieved. The SCHUNK EMH magnetic gripper is available in four sizes for workpiece weights of up to 3.5 kg, 9 kg, 35 kg, and 70 kg. For handling thin components and sheets, the magnetic holding force can be adjusted in four stages.


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Gripping And Clamping Solutions For Process Automation

Gripping and Clamping Solutions for Process Automation

In this interview with Asia Pacific Metalworking Equipment News (APMEN), Vincent Teo, general manager of Schunk, talks about the gripping and clamping challenges that their customers are facing, and how they are helping them address these issues. Article by Stephen Las Marias.

Schunk is one of the leading providers of clamping technology and gripping systems worldwide. Founded in 1945 by Friedrich Schunk as a mechanical workshop, the company has grown to become what it is today under the leadership of his son, Heinz-Dieter Schunk. The company is now under the leadership of siblings Henrik A. Schunk and Kristina I. Schunk, the company founder’s grandchildren.

Schunk has more than 3,500 employees in nine production facilities and 34 subsidiaries as well as distribution partners in more than 50 countries. With more than 11,000 standard components, the company offers the world’s largest range of clamping technology and gripping systems from a single source. In particular, Schunk has 2,550 grippers—the broadest range of standard gripper components on the market—and its portfolio comprises more than 4,000 components.

Based in Singapore, Vincent Teo is the general manager of Schunk, where he is responsible for the Southeast Asia market, including Singapore, Indonesia, Thailand, Malaysia, Philippines, and Vietnam. In an interview with Asia Pacific Metalworking Equipment News (APMEN), Teo talks about the challenges that their customers are facing, and how they are helping them address these issues. He also talks about the trends shaping the clamping and gripping market, and his outlook for the industry.

APMEN: What is your company’s ‘sweet spot’?

Vincent Teo: Schunk understands the needs of manufacturing companies, which have assembly, handling and machining processes. Our products can apply in multiple manufacturing sectors.

APMEN: What sort of challenges are your customers facing?

Teo: Today, businesses face the challenge of getting skilled workers—and staff retention for many industries is becoming a struggle. This is even more severe for countries such as Singapore, which depends on foreign workers. If automation can help reduce these problems and improve work conditions, then more high-value jobs can be created.

APMEN: How is your company helping your customers address their problems?

Teo: We work together closely with our partners such as robot manufacturers and system integrators, and we aim to reach out to more customers to help them see the benefits of automation.

APMEN: What forces do you see driving the industry?

Teo: Collaborative robots, or cobots, have revolutionized many applications that were impossible to think of over a century ago. Less complicated programming equates to less man-hour training, making it cheaper for businesses to adopt robotics. This is game changer, and Schunk is working with the major players in this new era of robotics.

APMEN: What opportunities you are seeing in the Asia market for robotic clamping industry?

Teo: The trend towards automated loading on machining by robots is picking up in recent years. The company is well-positioned to support this growing demand with immediate solutions.

APMEN: What about the challenges in the region? How do you see the trade war between China and the US affecting the manufacturing industry?

Teo: There has been increased investments towards Asia. This is a good problem, where we see customers valuing more our solutions to help them to increase their productivity and capture more businesses.

APMEN: What are the latest developments in robotic clamping/gripping?

Teo: We constantly develop new products in anticipation of the needs of our customers. One example is our latest product, the VERO S NSE3 clamping module, which improves set-up time and has a repeatability accuracy of <0.005mm.

APMEN: How do you position yourself in this industry? What sets you and your solutions apart from the competition?

Teo: Schunk is a unique company, having clamping technology (CT) and gripping systems (GS) solutions. With more than 11,000 standard products, no other company has a comparable scale and size across the range of products. With integrated solutions for both, we provide our customers the best opportunity to automate their processes.

APMEN: What advice would you give your customers when it comes to choosing the correct robot clamping/gripping solution?

Teo: For the machining industry, some customers often invested in clamping solutions and realized later that they need to automate their processes. When they started to review, they will realize that their investments may not be future proof. This may further discourage them towards the automation idea. Our comprehensive CT products allow our customers to later upgrade with our GS products, as both offers seamless integration.

APMEN: The trend is toward smarter factories now, with the advent of Internet of Things (IoT), data analytics, etc. Where does Schunk come in in this environment?

Teo: Schunk sees the need to embrace new technologies. iTENDO, our intelligent hydraulic expansion toolholder for real-time process control, records the process directly on the tool, and transmits the data wirelessly to a receiving unit in the machine room for constant evaluation within the closed control loop. With iTENDO—the first intelligent toolholder on the market—Schunk is setting a milestone when it comes to digitalization in the metal cutting industry.

APMEN: What is your outlook for the robotic clamping/gripping industry in the next 12 to 18 months?

Teo: We understands our partners’ and customers’ needs. For gripping, we have come out recently with new products to address the growing demand for collaborative robot (cobots). For clamping, our latest NSE-A3 138 is specifically designed for automated machine loading. It has a pull down force up to 28kN with integrated bluff off function and media transfer units.




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Miniaturisation In Clamping Technology Thanks To Additive Manufacturing

Miniaturisation In Clamping Technology Thanks To Additive Manufacturing

Miniaturisation plays an important role in many industries, including machining manufacture. Therefore, clamping chucks also have to become smaller, more precise and more powerful. The requirements cannot be met with conventional manufacturing – MAPAL therefore relies on additive manufacturing by selective laser melting. Article by MAPAL.

Whether in electrical engineering, medical technology, the aerospace industry, the watch industry or robotics and mechanical engineering – many products are becoming ever smaller, yet smarter, more user-friendly and more powerful. The topic of space is therefore crucial. Because space is not only limited on the wrist, in trouser pockets, on board an aircraft or in the human body, but also in the production halls of companies.

This requirement gives rise to the demand for productivity in the smallest possible space, which transfers the cycle of miniaturisation to the entire value-added level. Machine and tool technology in this small sector requires more and more functions having to be fulfilled in the smallest space, also in the area of clamping technology.

Perfect Radial Run-Out And Optimum Balancing Value

The radial run-out accuracy of the clamping chucks for a chipping thickness in the range of a few thousandths of a millimetre must be almost zero. This is the only way to achieve good surfaces at maximum spindle speeds with a long tool life. In addition, it must be ensured that any contamination due to microparticles is excluded. Another important topic for machining in the miniature sector is the supply of coolant lubricant. Too much medium means complex downstream part cleaning, too little or no cooling leads to a loss in quality and productivity.

If handling should also be simple, conventional manufacturing reaches its limits. The smaller the tool and clamping chuck, the easier handling must be. Because with each reduction, the handling of external peripheral devices becomes more complicated and more difficult. With shrink or collet technology, it also takes considerably longer for the tools to be ready for use. In the case of multi-part attachments, the individual deviations of the components also add up to a considerable error chain.

Additive Manufacturing By Selective Laser Melting

At MAPAL additive manufacturing by selective laser melting is used in all product areas. And this is the case in all situations where additively manufactured products can offer clear added value for the customer. Thanks to this innovative manufacturing process, MAPAL has succeeded in manufacturing clamping chucks in miniature format with HSK-E25 connection, for example for direct clamping of tools with a diameter of 3 mm. And these miniature clamping chucks meet all of the above requirements.

The Smallest Clamping Chucks With The Best Properties

In order to guarantee radial run-out accuracy, the clamping technology specialists have integrated innovative clamping chamber systems into the new clamping chucks, which fit snugly against the tool shank. They are equipped with dirt grooves to displace microscopic dirt. The required balancing value is ensured thanks to internal balancing geometries including support structures, which also optimise weight and strength. Overall, with the chucks in a small format, there can be achieved a more homogeneous and spindle-friendly acceleration and braking of the entire tool system consisting of clamping chuck and tool.

Thanks to additive manufacturing, MAPAL has succeeded in equipping the clamping chucks for the miniature sector with decentralised coolant outlets. Using parameters such as coolant pressure, setting dimension and spindle speed, these outlets are designed in such a way that they convey the coolant lubricant directly to the cutting point. In the best case, a dosed loss lubrication, which makes subsequent cleaning of the parts superfluous, is achieved.

Very Easy Handling Without Peripheral Devices

The new clamping chucks from MAPAL in a small format enable simple and quick clamping of the tool. Neither training courses nor high retooling costs or expensive peripheral devices are required for implementation. Because the hydraulic chucks are operated using a simple screw.

New Possibilities – Not Only For Tool Clamping

The new small hydraulic chucks also open up new possibilities for workpiece clamping. For example, for clamping hip joint balls. Here the external hydraulic clamping technology is used. Specially shaped chip flutes inside the chuck and a special external geometry ensure that the balls are clamped very precisely and gently at the same time. In medical technology in particular, topics such as reproducible precision are of enormous importance. And this is ensured during machining thanks to the new chucks.



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