DE1901279U - AUXILIARY DEVICE FOR SWITCHABLE MAGNETIC CLAMPING PLATES. - Google Patents

Description

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Deutsche Sd Edelstahlwerke Aktiengesellschaft, Krefeld, Oberschlesienstr; 16

It is known that ferromagnetic workpieces can be attached to the machine tool zi, especially during the magnetic soleplate. For this purpose, both electromagnetic and permanent magnetic clamping plates have been developed, the adhesive force of which can be switched on and off. Switchability is absolutely necessary because otherwise it would not be possible to lift larger workpieces from the clamping plate. At most they could be knocked down with a hammer parallel to the adhesive surface. This would then also disrupt the setting and clamping of the plate on the machine tool table. As is well known, it requires a very precise setting of the clamping plate on the work table, and even after spring renewed clamping of such a plate, the adhesive surface ₉ on which the workpieces are to be placed, be ground to compensate for the smallest on clamping errors.

This setting up of the clamping plates can also be done by the switching movement dee in the case of permanent magnetic plates required shift lever are disturbed. It is therefore often given preference to electromagnetic clamping plates.

Mt such clamping plates permanent magnetic and electro magnetic Type, relatively large workpieces can be clamped properly »Difficulties then arise, when small workpieces have to be clamped. These do not adhere properly to the switchable magnetic clamping plates. A switchable permanent magnetic clamping plate has a relatively

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• moderately coarse pole position on the adhesive surface, which does not allow to hold small workpieces properly so that they are also in the direction of the "acting loop or other machining druokes are perfectly fixed. This Naohteil is even stronger pronounced with electrically excited clamping plates.

The practitioner has in those cases where especially one Small number of small workpieces that have to be clamped for the purpose of machining helped by having such a small one Place the workpiece between ferromagnetic strips and plates, to prevent it from moving on the adhesive surface. Proceeding in this way is cumbersome and leads, for example, to profiled ones Workpieces are not always successful.

In order to grind angled pieces, magnetic clamping plates have been developed, which can be tilted around a central axis and adjusted to certain angular positions of the adhesive surfaces. Although can be with such a device a number of other grinding tasks solved, but editing is small and very small parts, for which there is also the small number of items for _s i in which they occur, is not worthwhile to create special clamping devices, this may now be magnetic or mechanical, the same sewing parts as described above.

An auxiliary device is also known ₉ which consists of a cuboid or also profiled block, which is composed of individual brass ο »the like. separate soft iron washers. It was assumed that with such an auxiliary device the effect of a finer pole pitch is achieved, in order to make even smaller workpieces stick, especially since it is also possible to profile the surfaces by grinding or other machining according to the workpiece to be clamped «Es it turns out, however, that although these auxiliary devices work well on the adhesive surface of the

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Clamping plate adhere ₉ that after the adhesive force exerted on its own adhesive surface is insufficient for small parts.

There is therefore a definite need for an auxiliary device which, with switchable magnetic clamping plates, can be used to magnetically clamp even small or very small ferromagnetic workpieces perfectly. According to the invention, such an auxiliary device is proposed as a close-knit series of permanent magnet plates and soft iron plates which is known per se and which is placed on a soft iron base plate. The purpose of this soft iron base plate is to allow this block-like auxiliary device to adhere to the switchable clamping plate. be made so large that it adheres perfectly and immovably to the activated permanent magnet plate with its soft iron plate. The narrow pole division on the adhesive surfaces of this auxiliary device ensures that small and very small workpieces are properly held. The narrow pole division comes about in a manner known per se in that soft iron plates with permanent magnet plates which are magnetized in the direction of their thickness _? be lined up in such a way that one soft iron plate is fed in with the same polarity from two adjacent permanent magnet plates. The polarity of the soft iron plate therefore changes in the direction of the extension of the adhesive surface. Barium ferrite is preferably used as the permanent magnet material.

It is most expedient to design the auxiliary device in such a way that two eagpolig © adhesive surfaces that are at right angles to one another be inserted into the angular space, which is formed by the base plate and a perpendicular side plate " This side plate can then be positioned above the level of the adjacent

fcartea, adhesive surface "so daö Sicli a Lifting eist been sucked out! © results, and further these Ansehlagleiate can also be made adjustable in height,

Such a device will usually be equipped with flat adhesive surfaces at right angles to one another. small workpiece © is required * This grinding of the surfaces for the purpose of profiling and also to compensate itXeiner Spanniangsiiamig ^ elteii "when setting up the ösl 4ie Snmdplatstct and the side plate mlis sw © i ₉ the Magaetreihiaag- einren-send end plates © form solid bases for the Sngpolrs & rung *

This auxiliary device allows "every complicated, ferrosaagnetic see W <srlsetüo & perfectly festauspasmöa »because the" blocky

in turn, you will find the switchable magnetic is liable and on your side as a consequence of the Engpolstarlcea and fifo? IClsintöiX © special g

Χϊι the Seiöhnuagt is a form of introduction to the Srfinäimg ia more perspective View shown «

In the example chosen, square © uaad iiuaäratiaoii © Weioheiseriplatten 2 gur Bildyjag eisiss försdgen OeMldes are lined up »25The permanent magnets 1 are magnetized in the middle of their plate hardness xmß. return in the series of two Saiiermagnetplatten lying soft.-iron plate © 2 equal © polarity on. » As a result, the polarity of the -wechselt Weicheiaenplatten Hichttmg in the surface of the cuboid formed off together · This Bngpolreihüng is placed on a Wöioheisenplatte 3, and Jawar voraugsweise tä ter & 2wischenschaltiQn a niohtferrosiagnstischen plate 4 _S

for example made of brass. With this soft iron plate 3, the auxiliary device can be placed on a clamping plate and on this are held * while the workpieces are on surfaces 5 and 6 can be placed on the stove in order to adhere firmly there.

It is particularly expedient to leave _s the two surfaces 5 and β extend completely at right angles to each other, it is also advantageous the edge ₉ - as indicated at 7 - to break.

"It is also advantageous to provide a second plate 8 made of soft iron with a brass plate 12 interposed _- which is at right angles to the base plate 3. It is also advisable to pull the plate 8 a short distance beyond the surface 5 so that a stop bar $ is created. this stop strip could also be designed so that it is adjustable in height, for example by such a bar is guided on the plate 8 by means of elongated holes and pins. If it is placed on the switchable disk ₉ to "äiä äiö auxiliary device, even such a stop bar is present, as is often the case with the clamping plates, which _{can be tilted and adjusted about a horizontal central axis 9} , the angled auxiliary device using this stop bar can serve to align the workpieces in a special way for the machining process «

In the example shown, end plates 1o and 11 are provided which delimit the series of magnets. These end plates 1o and 11 should form a solid frame with the base plate 4 and the side plate 8, which makes it possible to grind the surfaces 5 and 6 of the auxiliary device in a profiling manner and also to grind flat surfaces, as is necessary when setting up to compensate for small alignment errors "the framework ensures that _a even in heavy grinding or de? · necessary cohesion of the individual! ropes is given.

The auxiliary device can also take on other external shapes, see above e.g. be shorter and wider, i.e. have a more compact shape.

Claims (5)

Protection claims 1. Auxiliary device for switchable magnetic clamping plates, characterized in that a well-known close-pole juxtaposition of permanent magnet plates and TüTeieheisenplatten is placed on a soft iron base plate «, the clamping of the auxiliary device ^ on the switchable clamping plate is used » 2. Auxiliary device according to claim I ₉ . characterized in that two close-pole adhesive surfaces standing at right angles to one another are inserted into the angular space which is formed by the base plate and a side plate perpendicular thereto. 3. Auxiliary device according to claim T and 2 _S, characterized in that the one soft iron plate is pulled up relative to the adjacent plane to form a stop line. 4. Auxiliary device according to claim 3 _S, characterized in that the stop bar is adjustable in height. .5. Auxiliary device according to claims 1 to 4 _5, characterized in that the base plate and side plate with two end plates delimiting the magnet row form a solid frame for the narrow pole row in such a way that the cohesion is maintained even after repeated grinding.