Why is the workpiece easily deformed by wire cutting?

When a bamboo is split from the middle, both halves of the bamboo will become bent. Most of them are less bent, while the others are more bent. This means that the material itself will have stress, and the splitting process will break the balance of the original stress of the material and restore the balance through deformation. The same is true of workpiece deformation in wire cutting, because the cutting process breaks the original stress balance of the workpiece.

The deformation of WEDM is related to the structure of the workpiece. The narrow and long concave and convex dies are easy to deform, and their deformation is related to the complexity of the shape and the length width ratio; Workpieces with thinner wall thickness are prone to deformation.

If the deformation is very small, it can be almost ignored within the accuracy range required by CNC machining. However, if the deformation exceeds the requirements of processing accuracy, it will cause obvious deviation in the size and affect the processing shape of the workpiece.

There are many reasons for the deformation of wire cutting, such as material problems, heat treatment problems, structural design problems, process planning problems, workpiece clamping and cutting path selection problems during wire cutting. These various reasons will lead to deformation of internal stress of materials.

Preventive measures for machining deformation of precision parts

1) Rough machining or stress relief cutting before cutting

2) Processing threading hole

3) Optimize machining path

4) Multiple cuts

5) Optimization of processing technology of multi hole concave template

6) Set multi segment persistence