How to solve the problem of deformation of precision CNC turning parts in machining?

The deformation of precision CNC turning parts in machining is a difficult problem to solve. The reason for the deformation must be analyzed first, and then countermeasures can be taken.

Here is the content list:

l Reduce the internal stress of precision CNC turning parts

l Improve the clamping method of precision CNC turning parts

Reduce the internal stress of precision CNC turning parts

Natural or artificial aging, as well as vibration treatment, can help partially alleviate the internal stresses within precision CNC turning parts. Pre-processing is another effective method for managing these parts. For larger blanks of precision CNC turning parts, the significant margin can lead to considerable deformation post-processing. By pre-processing the excess part of the blank and reducing the margin on each section, not only can the deformation in subsequent processing stages be minimized, but also some of the internal stress in the precision CNC turning parts can be released after the pre-processed parts have been set aside for a while.

Improve the clamping method of precision CNC turning parts

For thin-walled precision CNC turning parts that lack rigidity, the following clamping techniques can help reduce deformation:

1. For thin-walled bushing precision CNC turning parts, using a three-jaw self-centering chuck or spring chuck clamped radially often results in deformation once the chuck is released after processing. Instead, a method that applies pressure to the axial end face of the precision CNC turning parts, which have better rigidity, should be employed. To align the inner hole of the part, a custom-threaded mandrel can be inserted through the inner hole of the precision CNC turning parts, and a cover plate used to press against the end face, secured with a nut. This setup helps avoid clamping deformation when machining the outer circle, ensuring satisfactory machining accuracy.

2. When machining thin-walled, thin plate precision CNC turning parts, it is advisable to use vacuum suction cups to achieve a uniform clamping force, followed by a minimal amount of cutting, which can effectively prevent deformation of the precision CNC turning parts.

3. The packing method can also be utilized to enhance the rigidity of thin-wall precision CNC turning parts during processing. Filling the interior of the parts with a medium can reduce deformation during clamping and cutting. For instance, precision CNC turning parts can be filled with a urea melt containing 3% to 6% potassium nitrate. After processing, the parts can be immersed in water or alcohol to dissolve and remove the filling material. Pre-processing of precision CNC turning parts is an effective method to manage deformation.

Kunshan JST Industry Co., Ltd is a professional CNC machining parts manufacturer, which was applied to the field of medical, aerospace & aviation, electronics, security & safety, industrial equipment, and automotive. In addition, we could also manufacture the custom parts of casting & forging, metal fabrication, and plastic injection parts. Our company has adhered to the principle of Innovation, Diversity, and International.