The concept and principle of medium wire cutting machine

Release time:

2024-03-11

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Medium wire walking belongs to the category of reciprocating high-speed wire walking EDM wire cutting machine tools. It realizes multiple cutting functions on high-speed reciprocating wire walking EDM wire cutting machines, which are commonly known as “medium wire cutting”.Medium wire walking technology points out here that the so-called “medium wire walking” does not mean that the wire walking speed is between high speed and low speed, but a composite wire walking machine tool, that is, the principle of wire walking is to use high-speed (8-12m/s) wire walking during roughing, and low-speed (1-3m/s) wire walking during finishing, so that the work is relatively stable, the jitter is small, and the material deformation and molybdenum wire loss are reduced through multiple cuts. The error caused by the loss of molybdenum wire, the processing quality is also relatively improved, and the processing quality can be between the high-speed wire walking machine and the low-speed wire walking machine.Therefore, it can be said that what the user refers to as “medium wire walking” is actually a reciprocating wire walking EDM wire cutting machine that draws on the processing technology of some low-speed wire walking machines, and realizes stripe-free cutting and multiple cutting.The medium wire-walking technology has been derived from practice. In multiple cuts, the first cutting task is mainly high-speed and stable cutting. High-peak current and longer pulse width standards can be selected for high-current cutting to obtain a higher cutting speed.The task of the second cutting is to refine and ensure the dimensional accuracy of the processing.Medium specifications can be selected so that the roughness Ra after the second cutting is between 1.4 and 1.7µm. In order to achieve the purpose of finishing, the low-speed wire walking method is usually used. The wire walking speed is 1 to 3m/s, and the tracking feed speed is limited to a certain range to eliminate round-trip cutting stripes and obtain the required machining dimensional accuracy.

The task of the third, fourth or more cuts (currently, the wire-walking control software can achieve up to seven cuts) is polishing and polishing, and the minimum pulse width (currently the minimum can be divided into 1µs) can be used for polishing, and the peak current varies with the processing surface quality requirements. In fact, the finishing process is a kind of electric spark grinding, the processing volume is very small, and the size of the workpiece will not be changed.The wire-walking method is like the second cutting, and the low-speed wire-walking speed limit can be used to feed.In the processing process of medium-wire technology, multiple cuts also need to pay attention to deformation treatment, because when the workpiece is cut online, with the action of the original internal stress and the influence of the processing thermal stress generated by the spark discharge, it will produce undirected and irregular deformation, which will make the subsequent cutting uneven in thickness and thickness, which affects the processing quality and machining accuracy.Therefore, different processing margins need to be reserved according to different materials, so that the workpiece can fully release the internal stress and completely torsional deformation, and there can be sufficient margin for fine cutting in multiple subsequent cuts, so that the final size of the workpiece can be guaranteed.

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