The Dynamic Characteristic and Finite Element Analysis on Wheelset Driving System of Underfloor Wheelset Lathe

Abstract

Wheelset driving system is a key function unit of CNC underfloor wheelset lathe, its properties and accuracy play a decisive role for working accuracy of the wheelset (trains, subways etc) tread. At first, it analyses the force of cutting point for wheelsets, and then, contact mechanics analysis and delivering power analysis are established based on friction wheels and wheelsets’ actual contact mechanics equations on wheelset driving system in this paper. At last, in order to analyze wheelset driving system’s rigidity and degree of deformation with loading condition, modeling analysis and static force analysis are set up in the finite element software after building wheelset driving system’s three-dimensional model. Introduction Wheelset driving systems, which fulfill motion importantly by friction driving, is one of the main technical characteristics of CNC underfloor wheelset lathe. Furthermore, the improvement of CNC underfloor wheelset lathe is accomplished start from that point. At present, two friction wheels are fastened on each side of the friction wheel bearing frame separately by horizontal pressure floating support equipment to finish turing rather rapid and scientific. What’s more, each of the friction wheel’s parameters such as location of the rising, size of stress and speed of the floating up and down etc, are controlled and detected respectively by horizontal pressure floating support equipment, which will bring significant breakthrough on the overall performances of CNC underfloor wheelset lathe. Therefore, for the above-mentioned many advantages, CNC underfloor wheelset lathe is concerned by many specialists and scholars at home and abroad. As regards driving systems, C.Segieth put forward its elastic suspension and isolability [1]. H.Hoedei and A. Haigermoser contrasted and evaluated the stability of the locomotive for driving systems in suspension way [2]. Josef Kolerus acquired the stable conditions to avoid stick-slip vibration for locomotive driving systems by simplifying linear model of locomotive driving systems [3].Martin B. Sebald came up with boundary conditions to choose driving systems and based on driving system structure to make a comparison for driving performance and running properties [4]. Xiyong Zhao and Yongfang Wu provided a overall suspension pattern for driving system’s suspension of high-speed locomotive bogie and made a great many of researches [5]. Dingchang Jin investigated driving system’s suspension parameter’s influence for the lateral dynamic performance of a locomotive [6]. Yongfang Wu established a locomotive dynamics model for motor frame hanging driving device and made an attempt on simulated calculation of pulley idling process [7]. Zan Luo and Dingchang Jin investigated the longitudinal and transverse stiffness of driving system’s suspension condition for the influence of acceleration of vibration and locomotive stationary [8, 9]. In conclusion, although many scholars at home and aboard have studied modeling simulation, mechanical vibration and stability of machine tools and locomotive’s driving systems, they seldom care about the study of driving system’s dynamics of CNC underfloor wheelset lathe. This paper analyze the wheels under the action of cutting force and friction wheels and wheels contact mechanics, and then to calculate the stress on the friction wheels and driving wheel’s force and moment. At last, in order to analyze wheelset driving system’s rigidity and degree of deformation International Conference on Mechanics and Civil Engineering (ICMCE 2014) © 2014. The authors Published by Atlantis Press 292 with loading condition, modeling analysis and static force analysis are set up in the finite element software after building wheelset driving system’s three-dimensional model. The model and analysis conclusion of this paper will contribute to improve overall performances and avoid driving system’s lose efficacy. Formulations On the basis of transmission relationship of CNC underfloor wheelset lathe, the structure diagram is as shown in Fig.1. Fig. 1 Cutting Transmission Schematic Diagram The Establishment of the Mechanical Model of Wheel Cutting Point In the process of cutting, the cutting force of cutting point as shown in Fig.1 of 1. On three directions equations under the cutting force is as follows: