Besides technical process preparation, there are few operation instructions of LS wire cut EDM machine, this article will introduce them to you.

Implement a small number of multiple cuts

The small and multiple cutting method refers to the use of the same diameter electrode wire to cut the same surface twice or more. The finishing allowance is reserved before the first cutting, and then the remaining finishing allowance , Switch to finishing conditions, use the same track program to reduce the offset in stages, and then perform cutting. Generally can be divided into 1 to 5 cuttings. Except for the first processing, the processing volume is generally gradually reduced from tens of micrometers to a few micrometers, especially for the last time with more processing times, the processing volume should be small, that is, several Microns. A small amount and multiple cuts can make the workpiece have an incomparable surface quality in a single cut, and the more the number of processing, the better the surface quality of the workpiece. The specific value is generally determined by the machining parameters of the machine tool.

The use of small and multiple cutting methods can reduce the deformation of the workpiece material during the wire cutting process, effectively improve the machining accuracy of the workpiece and improve the surface quality. A certain margin can be left during rough machining or semi-finishing to compensate for the material's stress balance The deformation caused by the destruction and the machining allowance required in the last finishing process can obtain a satisfactory processing effect. It is a simple and convenient method and measure to control and improve the quality of the processed surface, but the productivity is reduced.

Arrange the cutting route reasonably

The guiding ideology of this measure is to avoid destroying the original internal stress balance of the workpiece material as much as possible, and to prevent the workpiece material from being significantly deformed due to the unreasonable cutting route arrangement due to the action of the fixture during the cutting process, resulting in a decrease in the quality and accuracy of the cutting surface . In general, a reasonable cutting route should arrange the cutting section that separates the workpiece from the clamping part at the end of the general cutting program, and set the pause point at a position close to the clamping end of the blank.

Choose cutting parameters correctly 

Wire parameters, water parameters, and electrical parameters should be reasonably controlled and adjusted during wire cut EDM machine processing.

When the tension of the electrode wire is large, the amplitude of its vibration is reduced, the discharge efficiency is relatively improved, and the cutting speed can be increased. High speed of electrode wire can reduce the chance of wire breakage and short circuit, and increase the cutting speed, but too high will increase the vibration of the electrode wire and affect the cutting speed. In order to ensure that the workpiece has higher machining accuracy and surface quality, the wire speed and wire tension parameters provided by the machine tool manufacturer can be appropriately increased.

Increasing the pressure and flow rate of the working fluid makes it easier to discharge the ablated materials, which can increase the cutting speed. However, if it is too high, it will cause the electrode wire to vibrate, affect the cutting speed, and maintain the laminar flow to the limit.

Short pulse width, high peak current, and positive polarity processing are widely used in rough machining. The ultra-short pulse width (hundred nanoseconds) and single pulse energy (a few microjoules) are used for finishing, which can significantly improve the quality of the processed surface.

In addition, a stable power supply voltage should be maintained. Unstable power supply voltage will result in instability at both ends of the electrode and the workpiece, which will cause instability in the breakdown discharge process and affect the processing quality of the workpiece.

Control the distance between the upper wire guide and the workpiece

Low speed wire cut electrical discharge machine processing can be processed by distance close processing, that is, the distance between the upper wire guide and the workpiece is as close as possible (about 0.05 to 0.10 mm) to avoid the influence of excessive wire amplitude due to the long distance workpiece processing quality.