Electric heating – Metal heating – Cutting or disintegrating
Patent
1984-10-18
1987-10-06
Pellinen, A. D.
Electric heating
Metal heating
Cutting or disintegrating
19880301, 204297R, 204297M, 219 69R, 269235, B23H 702, B23Q 306, B23Q 315
Patent
active
046984755
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a workpiece pallet for fixing and transferring workpieces on machine tools, particularly spark-eroding cutting plants.
In conjunction with the large-scale machining of workpieces on machine tools, it is known to use gripping pallets and this practice is widely used. Generally such pellets are in the form of table-like plates with flutes, which are equipped on their lower bearing side with conveying, positioning and fixing means. The gripping pallets generally make it possible to reduce loading work and consequently the preparation time, particularly if the workpieces have to be guided over several working stations. Gripping pallets also reduce the idle times, because during the working of the workpiece on one pallet, a new workpiece can be fixed and/or prepared on another pallet. Special difficulties occur when using such known workpiece pallets on spark-eroding cutting plants. In such cutting plants, which have a path-controlled, continuous wire electrode, for example, randomly shaped prismatic workpieces can be produced. The workpiece is either cut from a larger piece of material, or conversely the surrounding outer shape represents the workpiece and the inner part is cut away as blanking waste. The operating sequences on such cutting plants are largely automated, so that they are eminently suitable for the large-scale machining of workpieces. The use of workpiece pallets on such machines makes it necessary for the pallet to be automatically loadable on the machine. While maintaining positioning precisions which satisfy the high precision requirements of tool construction and particularly the close tolerances which can be obtained with spark-eroding cutting plants. In addition, there is the difficulty that during spark-eroding cutting, the workpiece must be fixed yet freely accessible to the continuously transiting cutting wire. These requirements are not fulfilled by known workpiece pallets. In many cases, the workpiece must be changed manually after each machining stage. In this case, the alignment of the workpiece is also left to the operating personnel.
DOS No. 3127 495 discloses a pallet for transferring and storing workpieces, particularly for automatic workpiece loading means, and comprises an elongated basic body. The latter contains inserts with openings for the workpieces and a guide slot running in the longitudinal direction of the body. This guide slot cooperates with a guide rail in the workpiece loading means. The decisive disadvantage of this device is that the guide slot intersects the machining range of the workpiece or the action range of the tools on the machine tool, so that free access, particularly from below to the workpiece, is not ensured.
The problem addressed of the present invention is to provide a workpiece pallet which meets fine machining tolerances on machine tools, particularly spark-eroding cutting plants, and which also permits the handling of workpieces, together with their orderly loading and unloading for automatic machining on machine tools. In addition, the trouble-free removal of machining waste is desired.
This problem is solved by the present invention which provides a workpiece pallet for fixing and transferring workpieces in a wire-cutting spark erosion machine where the pallet includes a frame having an insert means for clamping the workpiece in the working zone of the machine, a quick-clamping device for securing the pallet with respect to the machine, and a transfer holder adapted to be coupled with an external transfer mechanism for transferring the pallet to and from the machine, the quick-clamping device and the transfer holder being located outside of the working zone to facilitate the uninterrupted machining of the workpiece. This measure on the one hand solves the aforementioned problem in a particularly effective manner and with simple means on the other hand ensures free access to either side of the workpiece, which is very advantageous particularly for the completely satisfactory supply and removal of the wire electrode in
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Herzog Peter
Lothenbach Michael
AG fur industrielle Elektronik AGIE
Evans Geoffrey S.
Pellinen A. D.
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