When turning a large number of workpieces, a soft-claw chuck can be used in order to improve the positioning accuracy of the workpiece during machining and to save the auxiliary time during workpiece mounting. In order to change the diameter and shape of the claw surface arc at any time according to actual needs, the claws quenched by the three-jaw chuck are changed to low-carbon steel, copper or aluminum alloy claws. If the chuck jaws are two-piece, the claws can be replaced with soft metal; if the claws are integrated, a soft metal block can be fixed on the claws. After the claws of the soft jaw chuck are processed, the positioning accuracy of the workpiece can be improved.
For the new three-jaw chuck, the positioning accuracy after the workpiece is mounted is less than 0.01 mm. For example, the flat thread of the three-jaw chuck is worn more seriously, and the precision is poor. After the soft claw is processed, the positioning accuracy after the workpiece is installed can still be kept within 0.05 mm. The soft jaw chuck clamp has a machined surface or a soft metal that is not easy to pinch the surface. For thin-walled workpieces, fan-shaped claws can be used to increase the contact area with the workpiece and reduce the deformation of the workpiece. The soft-claw chuck is suitable for the machined surface as a positioning precision reference, and the semi-finishing and finishing of the workpiece is carried out in mass production. The correct adjustment and turning of the soft-claw chuck is the primary condition for ensuring the accuracy of the soft-claw chuck. The bottom surface of the soft claw and the positioning table should be slidably fitted and correctly positioned with the claw base.
The part of the soft claw used to clamp the workpiece is longer than the hard claw (10~15) mm, so that it can be turned for multiple times and must be matched; the diameter of the turning soft claw is the same as the diameter of the workpiece to be clamped, or larger or smaller. There is no guarantee of clamping accuracy. Generally, the turning diameter of the claw is about 0.2mm larger than the diameter of the workpiece, that is, the diameter of the workpiece to be clamped, and it should be controlled within a certain tolerance range. When the soft claw is turned, in order to eliminate the gap, a claw must be installed in the claw or outside the claw. Cylindrical or circular rings of appropriate diameter, which are in the position where the soft jaws are installed, should be in the same direction as the workpiece clamping, otherwise the positioning accuracy of the workpiece cannot be guaranteed. When the workpiece is clamped, the cylinder should be clamped inside the chuck jaws to make the soft claw surface of the car. When the workpiece is tightened, the ring should be installed outside the chuck claw and outside the soft claw.