1 year ago

MDA Technologies 3/2016

MDA Technologies 3/2016

01 The dryspin lead

01 The dryspin lead screw unit operates without lubrication and maintenance. The high helix thread creates the prerequisite for low loadon the electric motor, precise positioning and minimised noise 02 With the Linearis system, ARIS is expanding its product range of actuators for precise linear motion The Linearis drives convert the rotation of the electric motors into a precise linear movement and thereby apply 600 to 2,500 N actuating force depending on the size. The “dryspin” technology developed by igus, in which a plastic nut made of wear-resistant high-performance polymer moves along a stainless steel high helix lead screw, is a central component of this drive system. This high helix lead screw units offer specific advantages. Dipl.-Ing. (FH) Michael Andersen, project manager design/development at Aris “The high pitch means that we achieve large strokes with relatively few rotations. This puts less stress on the drive, reduces the rotary speed and minimises the noise output.” Aris uses dryspin drives from igus with customised outer geometry of the nut. In the bearing block, two axial plain bearings made of igus high-performance polymer ‘iglidur Q’ ensure the absorption of high loads; at the same time the clearance of the unit can be set via the axial bearing. tested by igus – obviously with positive results. This collaboration contributed to a very short development time. Michael Andersen: “We arrived at the results faster than expected, which we need.” Among the tests performed by Aris in the in-house laboratory, besides the load tests of the Linearis system there were also a series of tests with different types of contamination. Only when all the tests were completed satisfactorily did Aris begin with the market launch. Rolf Schneider: “Linearis has established itself quickly – in the project planning of new systems and also in the retrofitting and upgrading of existing facilities.” Photographs: teaser fotolia, 01 and 03 Aris Stellantriebe GmbH, 02 and 04 igus GmbH Lubrication free operation Some customers who were introduced to the new drive by Aris were initially sceptical. Michael Andersen: “Initial reservations about the plastic material could easily be resolved with a bit of gentle persuasion. The service life calculations from igus and the test results from Aris speak for themselves, and the freedom from lubrication of the dry-running linear drive is a big plus in painting, just as in many other applications.” The same applies to the maintenance-free operation. The linear actuators used in these areas so far had to be lubricated once a week, which not only takes time, but also increases the risk of dirt accumulation. Moreover, as noted by the Aris sales personnel, for some customers the reference to igus components was a good “door opener”, which eliminated the scepticism about plastics. The first prototypes of the new linear drive were intensively tested in the Aris laboratory. The dismantled drive elements were then 03 ”Tried and tested” Aris tests the dryspin units under extreme conditions MACHINE ELEMENTS 04 Michael Hornung, igus product manager, linear and drive technology (left) and Dipl.-Ing. (FH) Michael Andersen, Project manager design/development at Aris (right) MDA Technologies 3/2016

Permanently sealed – independent of the pair of materials In practice leaks occur again and again in the region of the seal with screw-fit hydraulic components. The reason for this is that in the installation of hose pipes connections frequently the tightening torque is exceeded. With the new Ecovos fittings from Voswinkel GmbH with block stop safety the end of installation is displayed. The difference to the usual sealing cone fittings here is in the predetermined space between the two front faces of the components to be screwed together. This space prevents over tightening of the tightening torque and ensures that the prestressing necessary is achieved in the screw-threaded pair. This prevents the fitting loosening independently when placed under a load. Even when loosened and re-connected repeatedly the full sealing function is achieved. What is nor the block stop safety holds independent of the pair of materials. The user does not need to adjust the tightening torques, for example when pairing up the hose fitting with cast-iron or wrought-iron screw connectors. Ecovos hose fitting is supplied in nominal diameters of DN06 - DN16 and is expected to be available from the second quarter of 2016. Suction and lowpressure hose for extreme weather conditions For use in extreme weather conditions or in particularly tight uinstallation spaces e.g. construction vehicles the company Dietzel Hydraulik is presenting the suction and low-pressure hose 17A with temperature resistance from -40 to 100 °C. On the basis of its structure, of two high tension resistant braided textile insert linings and two parallel steel wire spirals, in comparison to the In the event of ... ROBA ® -topstop ® Securing instead of improvising Visit us at: Hall B5/Booth 403 Visit us at: MOTEK Stuttgart Hall 6/Booth 6325 standard SAE 100 R4 on average 66 percent better bending radii can be achieved. The hose is available in the nominal diameters DN19 to DN152. In addition Dietzel supplies tested systems, i.e. the integration in all available nominal diameters were tested using vacuum, density and bursting pressure tests. Integration is possible with ferrules and hose clamps. “As manufacturer of percision machining machines, we place high demands on quality, reliability and safety. This is why, for 25 yeras, we have trusted in ROBA-stop ® safety brakes by mayr ® power transmission.” Klaus Bauer, Head of Design and Development Machine Tools Factory, WALDRICH COBURG GmbH Attention! Safety-crictical axis. Use only ROBA-stop ® -brakes. D-87665 Mauerstetten,, Tel.: +49 (0) 8341/8040 your reliable partner


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