切点跟踪磨削新原理的研究

The journals and crankpins of crankshaft for automotive engine need to be ground for engineering application. Usually, they are ground separately in two grinding machines in home and abroad, one machine is for journals and the other for crankpins. Therefore, there are some shortages: Machining efficiency is lower; it is difficult to obtain the necessary machining accuracy and surface quality; two sets of grinding machines, large installation area and much investment are needed. Simultaneously, it is lack of basic research for highly efficiency machining of this kind of components, and this kind of high precision grinding machine used in production are imported from abroad. This project is a basic research for the grinding of crankshaft parts, in which a new grinding method------- tangential point tracing grinding, is developed.The principle of the new grinding method is studied, in which the grindings of the crankshaft and camshaft are as the objects, the kinematics, dynamics, and grinding mechanics are theoretically researched. The kinesiology models for crankshaft and camshaft are separately founded. The grinding accuracy, surface quality and their influence are analyzed. The influence of the stiffness of crankshaft on dimension accuracy is analyzed and the mathematical model of compensation to the errors caused by the stiffness is developed. A NC grinding machine is reconstructed, some tooling are designed and manufactured for the experiments of tangential point tracing grinding. The experiments to crankshaft for the new grinding methods are successfully done, the grinding force is measured, and some important results are obtained.It is obvious from the experiments that the new grinding method------ tangential point tracing grinding, is suitable to the grinding of crankshaft parts (of which the distance from the geometric center of the grinding surface of the part to the real rotating center while ground is large ). The principle of grinding is correct, and the method is feasible. The very important first hand materials are provided by the studying results for the design of grinding machine and NC programming of tangential point tracing grinding

许多异型零件（例如汽车发动机曲轴）都需要进行磨削加工。现有的加工方法存在着生产效率低、加工精度和表面质量难以保证、设备和厂房的投资大等问题。本项目就是为解决这些问题而研究一种新的磨削方法，即切点跟踪磨削法，并对其运动学、磨削机理、加工精度、表面质量、磨削力等进行分析、建模和实验等研究，具有极其重要的理论意义和实用价值。