Test optimization method for pre-tightening force of ball screw of feeding system of numerical control machine tool

Abstract

The invention relates to a test optimization method for the pre-tightening force of a ball screw of a feeding system of a numerical control machine tool. The test optimization method comprises the following steps: establishing a measuring system for the pre-tightening force of the ball screw; establishing an evaluation index system for the dynamic performance of the feeding system; designing a test variable according to an evaluation index, performing dynamic performance test by utilizing a laser interferometer and analyzing the rule of influence of the change of the pre-tightening force on the dynamic performance of the feeding system according to a test result; analyzing the dynamic performance of the feeding system by adopting a layering analysis method, thereby accurately acquiring the pre-tightening force corresponding to the optimal dynamic performance of the feeding system. According to the test optimization method provided by the invention, the measuring system for the pre-tightening force of the ball screw and the evaluation index system for the dynamic performance of the feeding system are combined for acquiring the rule of influence of the change of the pre-tightening force on the dynamic performance of the feeding system by analyzing the test result on the basis of repeated dynamic performance test of the feeding system, so that the optimized pre-tightening force can be accurately, simply and conveniently acquired and the earlier stage assembly and the later stage adjustment of the ball screw can be guided.

Description

technical field [0001] The invention relates to a test optimization method for the pretightening force of the feeding system of a numerical control machine tool. In particular, it relates to an experimental optimization method for the pretightening force of a ball screw in a feed system of a numerical control machine tool. Background technique [0002] Ball screw and rolling bearing are the basic mechanical transmission devices of the feed transmission system of CNC machine tools, and their pre-tightening degree directly affects the machining accuracy of CNC machine tools. The ball screw preload mainly includes the preload between the ball screw nut and the ball screw shaft end bearing. Since the pretightening force of the ball screw nut pair in the feed system cannot be directly measured, it can only be measured indirectly by using the pretightening torque, and after leaving the factory, the pretightening force between the ball screw nut pair has been determined. [0003]...

AI Technical Summary

Problems solved by technology

[0003] Since the ball screw is installed by pre-tensioning, the pre-tensioning of the ball screw is realized by pre-tightening the shaft end bearing of the ball screw. The specific stretching amount is determined according to the empirical formula, and it is difficult to reuse.

Images