How to Choose the Direction and Point of Action of the Clamping Force of CNC Machine Tools?

1. The clamping force should be directed toward the main positioning reference. The workpiece has a verticality requirement with the /4 surface. Therefore, the A surface is used as the main positioning base surface during processing, and the direction of the clamping force F should be directed toward the /4 surface. If the clamping force is changed to the B surface, due to the angle error between the side /4 of the CNC lathe part and the bottom surface B, the positioning position of the workpiece is destroyed during clamping, affecting the verticality requirement of the hole and /4 surface.

2. The point of action of the clamping force should fall within the support range of the positioning element and be close to the geometric center of the supporting element. The clamping force acts outside the supporting surface, causing the workpiece to tilt and move, destroying the positioning of the workpiece.

3. The direction of the clamping force should be conducive to reducing the size of the clamping force. When drilling hole A, the direction of the clamping force is the same as the axial cutting force F. The direction of the workpiece gravity C is the same, and the clamping force required for the processing process is smaller.

4. The direction and point of action of the clamping force should be applied to the direction and position with better rigidity of the CNC lathe parts. The axial rigidity of the thin-walled sleeve workpiece is better than the radial rigidity, and the clamping force should be applied in the axial direction; when the thin-walled box is clamped, it should act on the convex edge with better rigidity; when the box has no convex edge, the single-point clamping can be changed to three-point clamping.

5. The point of action of the clamping force should be as close to the workpiece processing surface as possible. In order to improve the rigidity of the workpiece processing part and prevent or reduce the vibration of the workpiece, the point of action of the clamping force should be as close to the processing surface as possible. When the fork is clamped, the main clamping force F: acts vertically on the main positioning base surface, and auxiliary supports are set near the processing surface. When applying appropriate auxiliary clamping force, the installation rigidity of the workpiece can be improved.