How to solve the problem of big jump of CNC lathe chuck?

Fixture is six points (3+2+1: three points for surface fixing, two points for line setting and one point for fixing), and machining needs to solve deformation and runout.

Is the handle of the tool too long? Is the TOOL HOLDER rigid enough? Is the speed and feed rate appropriate? A series of problems will cause the Spring Collet to jump greatly.

During high-speed cutting, because of the large machining allowance and intermittent cutting, the milling process often produces vibration, which affects the machining accuracy and surface rough accuracy. Therefore, the NC high-speed cutting process can generally be divided into: rough machining - semi finishing - corner cleaning - finishing and other processes. For parts with high dry precision requirements, it is sometimes necessary to conduct secondary semi finishing, and then finish machining. After rough machining, the parts can be naturally cooled to eliminate the internal stress generated by rough machining and reduce deformation. The allowance left after rough machining shall be greater than the deformation, generally 1-2 mm. During finish machining, the finish machined surface of the part shall maintain a uniform machining allowance, generally 0.2~0.5mm, so that the tool is in a stable state during the machining process, which can greatly reduce the cutting deformation, obtain good surface processing quality and ensure the accuracy of the product.

The main reason for the tool radial runout during machining is that the radial runout is aggravated in radial cutting. Therefore, reducing radial cutting force is an important principle to reduce radial runout.

The following methods are used to reduce radial runout:

1. Use a sharp knife

2. The front face of the tool should be smooth

3. The cleanliness of the chuck shall be good

4. The selection of cutting quantity shall be reasonable

5. Reasonable selection of cutting fluid