Why is the workpiece processed by wire cutting easy to deform? How to prevent?

Split a piece of bamboo from the middle, and the two halves of the bamboo will bend. The most half will bend less and the smaller half will bend more. This is that the material itself will have stress. The splitting process breaks the balance state of the original stress of the material and restores the balance through deformation. The same is true of workpiece deformation in WEDM. The cutting process breaks the original stress balance of the workpiece.

The deformation of WEDM is related to the structure of the workpiece. The concave and convex dies with narrow and long shape are easy to deform, and the size of deformation is related to the complexity of shape and the ratio of length to width; Workpieces with thin 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 machining accuracy requirements, there will be obvious deviation in the size and affect the machining shape of the workpiece.

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

Preventive measures for machining deformation of precision parts:

1) Rough machining or stress relief cutting before cutting

2) Machining threading hole

3) Optimize machining path

4) Multiple cutting

5) Optimization of processing technology of multi hole concave formwork

6) Set multi segment retention

Qijiang precision has long been committed to the processing of metal and plastic parts with high precision, high difficulty and easy deformation, the small and medium-sized batch production and manufacturing of light alloy and composite materials (such as aluminum alloy, carbon fiber, etc.), and the procurement and customization of robot parts.