Railway Vehicle Door Systems Double-headed Screw Transmission Performance And Machining Process Simulation

This paper taking the transmission system of rail transit vehicles door as its researching object and doing research.Firstly, researching and analysing the status of screw transmission in-dept. Based on the mastery of basic theory, completed the kinematic analysis of rotation roller screw screw transmission, and the relative sliding velocity between roller and screw, roller and nut is derived through the kinematic relations in rigid and elastic cases. At the end of this chapter, cited the screw currently used to analyse the result.Secondly, virtual prototype model is established based on ADAMS and doing the kinematics simulation of it. According to the results of theoretical calculations and the simulation results, we obtained the relative sliding velocity between roller and screw or nut, the facters influence it and the regularity of influence in cases of the initial status and after wear. All of the research above can provide the basis for reducing the friction and wear.In addition, with the modal analysis, we import the mnf files of result to ADAMS to establish the rigid-flexible mixed virtual prototype, and research the vibration of screw, get the movement stability of rail transit vehicles door. At the same time, by the input speed profile preferred the door is able to start-up and braking smoothly.Finally, I was researched the machining technology of the screw. On one hand, according to the structural characteristics, the requirements of performance and machining of the screw to select appropriate materials and heat treatment method, to test the mechanical properties, physical properties of the material after the heat treatment and formulate technological process; On the other hand, In order to solve the bending phenomenon caused by large milling force, we did the plastic forming simulation of milling to research milling force, stress, strain and temperature changes in process of milling use DEFORM-3D. Then doing the simulation of milling forces under different milling parameters and obtained the law of milling parameters influence on it. An optimal milling parameters is proposed to achieve minimum milling force with guarantee the the machining efficiency.