The importance of the elastic collet as a transmitter of force and precision in the machining system is indisputable. Even when machining workpieces with relatively low requirements for open roughness and precision, the accuracy of the collet should not be ignored. Now the vast majority of spindle dynamic balance for G1, taper hole runout 1-2u, while processing is the whole system at work. Not to mention the impact on the yield of the workpiece and tool life, good or bad collets on the spindle life is also critical.

With the improvement of dimensional accuracy and cylindricity level, the clamping force of the collet on the tool is linearly increased and the clamping force can be more uniformly transferred to the tool, and at the same time, improve the stability of the tool, the service life and the machining effect of the workpiece. With the improvement of the outer cone angle accuracy and surface roughness grade, the contact rate between the collet and the inner cone of the toolholder increases linearly, and the uniformity of clamping force transmission increases linearly, ensuring uniform force on the tool, avoiding deformation due to excessive local stress, and improving the service life of the tool.

The influence of different materials on the service life of the collet:

1. After salt spray test and wear resistance test on manganese steel, spring steel, chrome steel, stainless steel and other alloy steels, 3Gcr13M0 stainless steel, which is specially tempered, has both excellent corrosion resistance and abrasion resistance, and it can persistently maintain the stability of precision.

2. Collet radial runout on tool life and machining effect: In fact, radial runout not only affects the life of the tool more directly affect the machining accuracy and surface effect.

3. The impact of the dynamic balance of the cartridge on the machining effect: a good dynamic balance not only ensures the machining effect and stability, but also effectively extends the life of the spindle, shank and tool.

4. Collet bore size, cylindricity, external cone angle accuracy and roughness on the tool clamping force and service life: the following is the elastic collet in the machining test data comparison charts