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MDA Technologies 3/2016

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MDA Technologies 3/2016

Bending vibration

Bending vibration damping for wheeled loaders Argo-Hytos provides vibration damping systems in different forms of construction and combinations of function for springless mobile utility machinery. Common to all is that the movement of the bucket or the Schaufel lifting arm structure is uncoupled from the vehicle using a hydraulic accumulator. Pipe-break protection and constant access to the storage areas just as easy to ingrate as pump safety devices and outlet valves. The individual functional modules can be combined into a specific control block and integrated into the hydraulic system on hand without a great effort. The installation can be designed both for series production as well as for retro-fitting. W.E.St. Elektronik’s new multifunctional power amplifier The company W.E.St. Elektronik GmbH has developed a new power amplifier for a directional valve with 2 solenoids, or for 2 independent pressure or throttle valves with 1 solenoid, which combines many features of previous amplifiers in a single device. This results in shorter delivery times and enables a wide range of applications and a cost-effective store keeping for customers. Various adjustable parameters e.g. the free adjustment of the nominal solenoid-current, a very robust closed loop current control and a better signal resolution allow for an optimum adaptation to valves of various manufacturers. This leads to further cost reduction because a familiarization in different power amplifiers is not necessary. Another advantage is the integrated USB interface, which enables the parameterization with an inexpensive standard USB cable. Special programming cables are no longer required. A higher processing power, secure data saving with automatic error correction, higher MTTFD values and last but not least the DNV-GL certification is further significant features. www.w-e-st.de/en www.argo-hytos.com Wandfluh and HED co-operate in the field of controls Wandfluh and the US electronics manufacturer HED have signed a co-operation agreement. The first projects have already been successfully carried out. One of the applications is for a lumber transport trailer with a payload of 10 t, which in inaccessible terrain can be hydraulically accelerated or slowed too from the display in the towing vehicle. Wandfluh defined the overall concept here and programmed the HED components. The extended product sector makes customer specific hydraulic solutions in the moving or stationary sector possible. The components integrated in this way will come onto the market under the label of “Wandfluh powered by HED”. www.wandfluh.com

Cycloid gears as key technologies in tooling machines DRIVE TECHNOLOGIES Martin Pointner With fast tool changes and highly dynamic machining cycles, machine tool manufacturers are constantly increasing the performance of their systems. A glance at the industry media shows: On a highly competitive market, it is not unusual for new generations of machines to enter the market with a performance boost of up to 30 percent. Sumitomo Drive Technologies is supporting this development with its Fine Cyclo gearbox series, which enables increased productivity thanks to its physical operating principle, and especially, its zero mechanical backlash and high moment stiffness. Zero backlash and moment stiffness are among the most significant factors in achieving a positive correlation between productivity and production quality in machine tools. Elements such as rotary tables, swing tables and turrets must provide high torsional and moment stiffness so that machine tools can manufacture components both quickly and accurately. Every small deviation that measurably offsets an active force, decreases the speed at which workpieces can be machined within narrowly defined tolerances for dimensional accuracy or surface quality. Thanks to zero backlash, cycloid gearboxes by Sumitomo Drive Technologies have increasingly become a key technology. The high torque density also ensures that single-stage and double-stage cycloid gearboxes can be space-efficiently integrated in the machine layout. The advantages of the cycloid principle — Sumitomo Drive Technologies offers the widest selection of single and double-stage cycloid gearboxes on the market — in comparison to conventional gearboxes will become clear from the following application examples. More productivity thanks to fast tool changes In addition to the precisely controlled movement of the tools and workpieces during machining, high dynamics and precision are extremely important during tool changes. Every increase in speed has a direct impact on the productivity of a machining centre, by reducing unproductive processing time. Disc and chain magazines provide the option to retain tools in a machine. The rotative drive Author: Dipl.-Ing. (FH) Martin Pointner is product manager MCD at Sumitomo (SHI) Cyclo Drive Germany GmbH in Markt Indersdorf/Germany axle has the task of positioning (usually between 40 and 120) tools in front of the removal unit with high precision and speed. On disc magazines, these tools are horizontally arranged on the outer radius of the rotative axis, and on chain magazines - as the name would suggest - along a driven chain. This design has two effects on the gearbox. On the one hand, the required speed in conjunction with the robust design enables acceleration torques of well over 3 000 Nm. On the other hand, the high bending moments must be taken into account in the gearbox design. These result from the 90-degree angle between the disc magazine and drive axle, or from the chain tension, if applicable. The high bending moments permitted by the gearboxes of Sumitomo Drive Technologies make it possible to achieve this challenging task without an additional bearing - and also delivers savings in space as well as further savings through the elimination of components. If bending moments are to be completely avoided in an application, the special design of the Fine Cyclo gearbox enables the output to be realised via the external housing. The load then sits directly between the two main bearings. In the Fine Cyclo series of cycloid gearboxes by Sumitomo Drive Technologies, even the single-stage version can deliver acceleration torques of up to 7610 Nm. The double-stage version can achieve up to 30,000 Nm. These values are the result of the special design of the cycloid drives. Conventional gearboxes have interlocking pinions, whereas cycloid gearboxes transfer the torque via an eccentric shaft, cycloid discs and ring gear housing. In contrast to conventional planetary gearboxes, in which a small number of teeth bear the entire load, on a cycloid disc gearbox the load is distributed across at least 30 percent of the area of the cycloid discs, of which two or three are installed per stage respectively. In practice, this principle makes Cyclo gearboxes extremely shock-resistant and torsionally stiff. Especially in applications in which heavy loads must be positioned quickly, accurately and with high repeat precision, the gearbox is the Achilles heel of the drive axle. Due to their design, toothed gearboxes must cope with peak loads on only a small number of teeth and limited bearing surfaces. As a result, there is a high risk of long teeth, which are prone to bending, becoming deformed, as well as a strong tendency towards high wear on the tooth flanks due to friction. In contrast, cycloid drives offer flat and broad cam motions, which can deal with even heavy loads without taking any damage. Friction generates heat - and this has an adverse effect on production quality, especially in machine tools, due to the expansion of materials which is difficult to control. In Cyclo gearboxes from the Fine Cyclo series by Sumitomo Drive Technologies, the trans- MDA Technologies 3/2016