High Overload Conditions On The Ultima Te Load Bearing Capacity Of The Ball Screw Pair And The Research Of Servo Loading Test Bench

Because of its excellent linear transmission performance, precision ball screw has been one of important linear transmission elements in the spacecraft electric servo control systems, so the study of the bearing captivity under spaceflight conditions is very necessary. Based on the Hertz contact theory and elastic-plastic mechanics theory, combined with modern CAD/CAE software, the bearing capacity of the precision ball screw and the optimization design of structural parameters objective to increase the ultimate bearing capacity under a high overload condition were research in this paper. At the same time, ultimate bearing capacity test program and the precision ball screw servo loading test device were designed in this paper.Aim at high overload characteristics of aerospace condition, according to Hertz contact theory and elastic-plastic mechanical theory, the contact model of the ball with double circular raceway was established firstly, contact stress and strain formula in the elastic and plastic stage was given, and according to high overload conditions contact characteristics of precision ball screw, the analysis of too large plastic deformation could cause the failure of precision ball screw under the spaceflight condition and the formula for calculating the yield criterion and failure criteria was given in this paper, and the maximum allowable axial load which is based on the amount of plastic deformation was treated as an important indicator to measure the ultimate bearing capacity of ball screws under spaceflight conditions.Based on the research of the carrying capacity, ultimate bearing capacity of the precision ball screw can be improved by the improvement of rated static load, so in order to improve the static load rating, the numerical optimization design of some structural parameters in precision ball screw by GAOT Toolbox in MATLAB, and combined with the verification of ABAQUS finite element analysis, optimization program was finalized at last in this paper.At last, the ultimate bearing capacity test program was designed, and based on FCS multi-channel coordination loaded system, a precision ball screw servo load test bench was designed and developed in this paper, including the design of the test servo loading system, the motor drive module design, the data measurement acquisition system and test bench mechanical structure.