Wire EDM electrode wire reciprocating progressive wire-moving method and device

Abstract

The invention provides an electrode wire reciprocating progressive type wire winding method and device for WEDM (wire cut electrical discharge machining). The method and the device are characterized in that an electrode wire is controlled to perform continuous reciprocating motion, the advancing length is slightly larger than the retreating length each time, and by means of unequivalence of reciprocating wire winding, electrode wire loss is offset through whole micro propulsion of the electrode wire. The device is realized by adopting a double-wire-cylinder structure. A certain number (such as 1 mm) of new wires are always supplemented in each loop, so that the electrode wire loss is offset by the newly supplemented electrode wires (such as 1 mm) each time, the electrode wire loss in a machining process can be reduced, particularly, the effect is more obvious when a workpiece with high thickness and large cutting area is cut, and accordingly, the machining precision is improved; when a wire breaking phenomenon happens, the electrode wire can be subjected to void-cut to a wire breaking point along cutting joints with consistent width or performs in-situ wire penetration at the wire breaking point, and the machining efficiency is greatly improved.

Description

technical field [0001] The invention relates to a reciprocating wire electric discharge wire cutting technology, in particular to a reciprocating and progressive wire electric discharge wire cutting method and device for wire electric discharge cutting electrodes. Background technique [0002] High-speed reciprocating wire-cut electric discharge (HSWEDM) is a wire-cut electric discharge processing equipment with completely independent intellectual property rights in my country. Because of its high cost performance, it has been widely used in precision parts and mold processing and other fields. At present, the high-speed reciprocating wire EDM machine adopts the reciprocating wire-feeding method. The electrode wire on the wire drum of this wire-feeding method can be used repeatedly, and the operating cost is low, but it also has the following defects: [0003] (1) The wire winding method currently used usually has a wire length of 200-300m at a time. Since this section of el...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the loss of the electrode wire when the current high-speed reciprocating wire electric discharge (HSWEDM) machine tool cuts large thickness and large cutting area, which affects the processing accuracy, and returns to the origin when the wire breaks during the cutting process. Wire cutting will delay returning to the broken wire point and prolong the processing time due to the narrowing of the kerf, and the common problem of unilateral loose wires in the current wire feeding system. A reciprocating progressive wire feeding wire EDM electrode wire is invented. The method and device, which enable the electrode wire to complete the high-speed reciprocating wire movement on the one hand through the double wire cylinder, and at the same time, through the asymmetry of the reciprocating wire, the electrode wire is pushed forward in a small amount to offset the loss of the electrode wire, so that in the whole cutting During the process, the loss of the electrode wire is offset by the gradual advancement of the overall electrode wire, ensuring that in large-area cutting, the diameter of the electrode wire in the slit is basically unchanged, thus ensuring that the processing accuracy will not be lost due to the loss of the electrode wire. And when the broken wire occurs, the electrode wire can be cut quickly along the slit with the same width to the broken wire point or threaded in situ at the broken wire point

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