Support Rail Vibration Characteristics And The Effect On The Stability Of The Barycenter Offset Of Low-speed Movement Research

In the field of machine tool design, sliding guide rail system due to its large carrying capacity, strong stiffness, good vibration absorption and vibration reduction, become the most widely used form of machine tool guideway, especially suitable for the occasion of heavy duty machine tools or carry heavy large workpiece. Sliding guide rail system, however, because of the sliding friction between combination of the state, in the low speed heavy working conditions is often unstable crawl phenomenon occurred campaign and seriously affected by processing quality of workpiece. Therefore, the stick-slip phenomenon has become the hot topics in the study of many scholars on the slide guide system problem. Scholars have a lot of experimental research, theoretical analysis the mechanism of the stick-slip phenomenon explanation, influence factors, such as suppression method the results of the study. However, most of scholars on the analysis of slide guide system without considering the support guideway and the vibration characteristics of lathe bed components and artifacts barycenter offset caused two guide interface uneven effect on moving guide rail and the motion state. Slide guide based on the actual working status, this paper build its physical model for dynamic mathematical model of numerical simulation by MATLAB/Simulink simulation function, the numerical simulation for sliding guide rail system, variable factors which should be considered as a system, different motion simulation of slide guide. Eventually get to support the vibration of the rail system factors and the center of gravity offset influence on slide guide motions, for improve the low-speed movement stability of slide guide system to provide some theoretical support. The main research work of this article is divided into the following several parts:(1) slide guide based on the actual working status, will tend to support the conveyor components and dynamic rail system components are simplified as two degrees of freedom of movement, and their respective vibration factors as variables into consideration, build the slide guide of dual physical model and two degrees of freedom dynamic system, the more close to the actual working condition of describes the slide guide low speed motion state.(2) the use of symbols of viscous damping slide guide system, explains the stability of the slide guide, and according to the size of the viscous damping, the slide guide status under different driving speed will be divided into stick-slip state, transition state, and no creeping state, and to analyze the slide guide.(3) will tend to support the rail vibration factors as variables, the slide guide system under different motion state numerical simulation, and get the influence law of its movement on the slide guide of the whole system, to improve the sliding guide rail movement stability at low speed to provide some theoretical support. Two guide rail(4) the workpiece center of gravity offset caused by uneven as consideration, analyzed the movement of the slide guide. Make two supporting conveyor components and dynamic rail parts as the three degrees of freedom of movement system, and constructs a model of ternary physical slide guide. And the migration coefficient is introduced to set up the dynamic system three free sliding guide rail. Migration coefficient as a variable, the numerical simulation for the system, get the workpiece center of gravity offset the influence law of different motion state of slide guide.