The Study On The Precision Recession Modeling And The Precision Retaining Ability Test Of Rolling Functional Component

Rolling functional component is composed of the parts based on rolling friction instead of sliding friction characteristics.It includes several kinds such as ball screws,linear ball guides etc.The advantage of highly efficient energy,precision positioning,and precision guidance make it widely used in machine tools,medical,aerospace,automotive and other fields.Rimming at the precision retaining ability problems of the domestic rolling functional component,the basic theories of precision retaining ability of rolling linear guide and ball screw on VMC850 E vertical machining center were researched,the relevant precision retaining ability teat-bed was designed as well as its test scheme was made in the background of the national major science and technology project "Demonstration application of domestic rolling functional components in medium and high grade CNC machine tools",which can provide theoretical basis and detection methods for the precision improvement of the rolling functional components.Firstly,the movement mechanism and factors of precision recession of the rolling linear guide and ball screw were analyzed and summarized.The two main causes are elastic deformation and friction wear.Based on Hertz elastic contact theory,the stress and deformation the contact points between the rolling elements and raceway under the loading were analyzed,the elastic deformation calculation model was built.Based on Archard wear theory,the motion characteristic and the structure feature,the wear extent of the rolling element and the raceway was predicted by theoretical arithmetic.On the basis of the both,the precision model of the rolling guide and the ball screw were respectively established,which can be used to analyze the variation of the accuracy of the recession more accurately.Then,in order to improve the domestic detection technology of the rolling functional components,the new test-bed was designed based on VMC850 E,which include the testing institution,numerical control system,and the hardware platform.The three-dimensional model of the test-bed was established by SolidWorks.Moreover,the dynamic equivalent average load of the rolling linear guide slider and the ball screw were calculated.The test load was determined according to the calculation results.Base on the test load and test-bed,the constant stress accelerated life test method and the corresponding data analysis and evaluation methods were used,and the rolling linear guide was tested.