Hybrid Ceramic Ball Screw Pair Stiffness Impact On The Positioning Accuracy Of Machine Tool

As a kind of precise transmission device, in the process of working, the ball screw axialcontact stiffness has a great impact on CNC machine tool performance, especiallypositioning accuracy. Hybrid ceramic ball screws derived from conventional steel ballscrew and often used in underloading occasions have emerged as a promising new productand offered significant potential profits. Presently the techniques of hybrid ceramic ballscrews are at original stage, and some theoretical researches and experiments involed arecomplex and difficult to be accomplished.This paper has a comparision with matal and ceramics for the phisical and mechanicalproperties and performance, and finally selects silicon nitride ceramic material as ballscrew’s material, analysize the impact on the positioning accuracy due to the changes inthe material.Describes the stiffness of the rolling ball screw system, analyse these factors one byone, and validates these by finiting element software, and then compares and analyzes itsinfluence on positioning accuracy. Based on the Hertz theory, establishes the model ofpoint contacting, Analysize the characteristic of ball screw pair, Establishes a single nutand double nut contact characteristics analysing mathematical model, Derivats the axialdeformation and axial contact stiffness’ formulation, and use finiting element software toanalysize them for technology and verification. At last, analysize the dynamicperformance of the hybrid ceramic ball screw pair, analysize the hige speed and low speedperformance, and analysize the modal of it, and then compares the analysis withtheoretical results and finite element results.