1, adjust the CNC lathe CNC lathe should be adjusted before machining CNC lathe, CNC lathe includes: the connection line between the spindle center and the tailstock center should be parallel to the full length of the guide rail; The centers of the spindle and tailstock center fixture should be coaxial; The gap between saddle, middle slide plate and small slide plate should be appropriate to prevent it from being too orange or too tight, because it will prick the knife, and too tight will lead to uneven feed.

2. Straightening of workpiece (including straightening before processing, during processing and finished product) Before processing, the bar is not straight, so bending cannot be eliminated by cutting. When straightening, hot straightening method should be adopted, but cold straightening method should not be adopted, and hammering should be avoided; In the process of machining, the hook straightening method is often used for straightening.

3, control stress clamping elbow should prevent prestress, make the workpiece deformation.

4. The grinding of the heel frame should be closely matched with the supporting claws and pillars of the heel frame, and the supporting claws should be made of ordinary cast iron or nylon 10 10. The supporting claw of CNC lathe should be in good contact with the surface of workpiece. When the diameter of the workpiece changes or different workpieces are replaced during machining, the supporting claw should be ground.

6. Adjust and repair the tool rest support claw, and start rough turning after selecting cutting parameters. After the NC lathe tool cuts the workpiece, immediately adjust the screw of the heel rest. When the longitudinal cutting is about 20-30mm in the feeding process, the outer supporting claw of the heel rest should be contacted with the workpiece processing surface quickly, then the upper supporting claw should be contacted, and finally the screw at the top should be tightened.

Extended data:

When turning the slender shaft, we should not only solve the bending and vibration caused by the insufficient rigidity of the slender shaft, but also pay attention to the phenomenon that the slender shaft is prone to taper, sag and bamboo joint.

1, and the taper is caused by the wear of different shafts or tools between the top stage and the spindle center. The solution is to adjust the accuracy of the machine tool, select better tool materials and adopt reasonable geometric angles.

2. Concave in the middle is a phenomenon that the two ends are big and the middle is small, which affects the straightness of the workpiece. The reason for this is that the supporting claw on the outside of the heel bracket is pressed too tightly. When it is close to the rear jacking shaft or headstock, the material has strong rigidity, so the diameter of both ends of the workpiece is large, while the rigidity in the middle is relatively weak, so the supporting claw will be pushed from the outside, thus increasing the cutting depth, so the middle is concave. The solution is to make the supporting claw neither too tight nor too loose.

3. The slub shape is the phenomenon that the diameter of the workpiece is unequal or the surface is uneven, and it is also caused by too tight (too loose) contact between the outer support claw of the tool holder and the workpiece or poor precision of the tool tip.

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