Method for determining the parallelism of ball linear guide assembly based on the dynamic characteristics of CNC machine tool feed system

Abstract

A method for determining the assembly parallelism of ball linear guides based on the dynamic characteristics of the feed system of CNC machine tools. Firstly, the relationship between the assembly parallelism error of linear guides and the contact deformation of the guide rail slider balls is analyzed, and the ball bearings are deduced based on the elastic Hertzian contact theory. The contact stiffness and the equivalent normal stiffness and tangential stiffness relational expressions of the slider pair were further analyzed to obtain the change law of the equivalent stiffness of the guide rail slider pair with the parallelism error of the linear guide rail; and then the hybrid element method was used to establish the table system The variable coefficient dynamic equation analyzes the influence of different parallelism errors of the linear guide rail on the dynamic characteristics of the system, and provides a theoretical basis for enterprise engineers to actively design the parallelism error of the linear guide rail according to technical requirements to ensure the consistency of the dynamic characteristics of the feed table system.

Description

technical field [0001] The invention relates to the technical field of machine tool equipment design and manufacture, in particular to a method for determining the assembly parallelism of a ball linear guide rail based on the dynamic characteristics of a feed system of a numerically controlled machine tool. Background technique [0002] As the working machine of the manufacturing industry, CNC machine tools have been widely used in aerospace, automobile, shipbuilding and other manufacturing fields, and the ball linear guide rail feed system is a key functional component of CNC machine tools. The quality of its dynamic characteristics will eventually affect Processing quality of parts. When the span of the guide rail and the structural size of the slider are fixed, the assembly process of the linear guide rail, such as the straightness of the guide rail, the parallelism between the guide rails, etc., directly affects the relative pose and dynamic combination of the machine to...

AI Technical Summary

Problems solved by technology

[0003] For the determination of the parallelism of the guide rails of the ball linear guide rail feeding system, the design and assembly are mostly determined based on engineering experience, which will lead to differences in the assembly of the parallelism of the guide rails by different people, resulting in different modal frequency distributions of the system , will eventually affect the processing quality of the parts

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