Liquid feeding method and liquid feeding device for CNC wire cutting

Abstract

The invention discloses a numerical control wire-cutting fluid feeding method and a fluid feeding device; when wire-cutting machining is carried out on a workpiece, working fluid is enabled to spray to a molybdenum wire machining area all the time along a gap space machined on the workpiece; an included angle between a spraying direction of the working fluid and a molybdenum wire is N which is greater than 0 degree and less than 90 degrees. According to the method and the device disclosed by the invention, the cut gap space is utilized skillfully and a large-volume fluid feeding channel is formed between the machined molybdenum wire and a nozzle, so the fluid feeding amount of the channel is expanded timely and effectively, the fluid resistance of a working fluid discharge channel is reduced, the fluid exchange capacity in the molybdenum wire machining area is obviously improved, the problems of secondary discharge or short circuit and the like due to poor chip removal are prevented, and the wire-cutting machining efficiency and quality are ensured.

Description

technical field [0001] The invention belongs to the technical field of wire cutting, and in particular relates to a liquid feeding method and a liquid feeding device for digitally controlled wire cutting. Background technique [0002] Wire cutting process is to use continuously moving thin metal wire as electrode to perform pulse spark discharge on the workpiece to etch metal or cut into shape. This equipment is mainly used for processing superhard steel, hard alloy, various complex and precise workpieces. . Electrode wire is a thin metal wire (usually called molybdenum wire) made of precious metals such as molybdenum. The molybdenum wire discharges with the workpiece through the working fluid medium (emulsion, electrolyte, etc.), and corrodes the metal to achieve the purpose of cutting and forming. . [0003] In recent years, with the continuous development of automation technology, various CNC wire cutting equipment has gradually become popular in the electrical processi...

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Problems solved by technology

[0003] In recent years, with the continuous development of automation technology, various CNC wire cutting equipment has gradually become popular in the electrical processing industry, and its mechanical precision, position closed-loop control, high-frequency power supply and other technologies have reached a high level. However, as an integrated The three major functions of the discharge medium, chip removal carrier and cooling electrode are the working fluid, and its replenishment technology is relatively lagging behind, which has always been a technical problem that hinders the improvement of processing efficiency and quality

Existing wire-cutting machine tools are supplied with liquid through a guide nozzle water spray plate (hereinafter referred to as the liquid spray plate) placed directly above the molybdenum wire processing point. There are many small holes around the guide wire nozzle on the liquid spray plate to realize spraying. Fluid function, the chips after the workpiece is electroeroded can only be discharged from top to bottom by the working fluid. Since there is only a 0.025mm annular processing space for liquid supply, the space for the liquid inlet channel is narrow, and the electroerosion chips are discharged in a single direction. Poor chip removal can easily lead to the following consequences:

[0004] 1. Unsmooth discharge of electric erosion chips will cause significant changes in the composition of the working fluid, seriously affecting the discharge effect of electric machining, resulting in a decrease in the efficiency and quality of wire cutting processing, and even causing broken wires

[0005] 2. High-speed and high-efficiency cutting with wide pulse and high current will produce larger and more electric erosion chips

Once the chip removal is not smooth, it is easy to cause unstable cutting process or wire breakage. Therefore, this is also the main reason why many machine tools cannot achieve high-efficiency cutting with wide pulse and high current.

[0006] 3. Due to the short circuit caused by poor chip removal, the gap voltage acquisition signal is low, and the CNC system will automatically reduce the processing speed according to the signal, thus affecting the processing efficiency

[0007] 4. Due to poor chip removal, it will directly affect the surface roughness and machining accuracy of the workpiece

Due to the narrow space of electro-erosion machining, it will often cause poor chip removal, and it is easy to cause problems such as secondary discharge or short circuit, which will affect the processing efficiency and quality, and even cause broken wires.

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