In order to obtain higher accuracy, the following points should be considered during the machining of the ball screw:
(1) The outer circle and rib can be processed in multiple times, and the cutting amount can be slowly reduced, thereby slowly reducing the cutting force and internal stress, reducing the machining deviation and improving the machining accuracy.
(2) The aging treatment should be stopped after each rough machining of the outer circle and rough machining to eliminate internal stress. The higher the precision requirements for the screw, the more times the aging treatment is performed.
(3) After each aging treatment, a new middle hole should be punched or the middle hole should be ground to repair the deformation during the aging treatment; remove the oxide scale, etc., so that the processing has a reliable and accurate positioning base.
(4) Before each processing, add two L screw outer circles (the cutting amount is very small), and then use the outer circle of the screw and the middle holes at both ends as the positioning base to process the thread, and gradually improve the rib machining accuracy.
The straightening and heat treatment process of the ball screw in the process is the key process to ensure the accuracy of the screw and avoid bending deformation. Straightening place.
It itself generates internal stress, which is obscure for a lead screw that requires high precision. When the internal stress tends to dissipate gradually, the lead screw will be deformed due to the dissipation of the internal stress, thus affecting the accuracy of the lead screw. For the precision screw with high precision requirements and large ball screw diameter, it is not relatively straight in the processing process, but the method of increasing the total radial allowance and the allowance between processes is used to cut off the tortuous deformation one by one. Aging treatment and separate processing before processing. In order to avoid the bending deformation of the screw rod due to its own weight, it should be stored in the corresponding vertical storage, and stopped in the pit furnace during heat treatment. Under normal circumstances, the rib of the unhardened screw is turned by turning, and the rib of the hardened screw is ground on the rib grinder. However, for rough machining of large tooth half angle, large pitch, lead screw, rib, etc., it should be turned before hardening.
Lishui Yongrun Precision Machinery's main products: linear modules, ball screws, linear guides, spherical splines, cross guides, motor seats, couplings, screw support seats, etc.