The Research On The Influence Of Temperature Variation To The Fit Accuracy Of Mechanical Elements

With the development of high science & technology and precision theory, the influence of temperature on manufacturing and measuring accuracy of mechanical elements has been paid more and more attention to. Now, the research on thermal deformation of mechanical parts is one of focuses in mechanical science. This subject is supported by National Natural Science Foundation of China ("Research on Fundamental Theory of Thermal Error for Mechanical Fit and Its Application", No.50075023). The theory on thermal deformation of mechanical elements in non-uniform temperature distribution is mainly studied. Many experiments have been finished and some new ideas have been attained.In the paper, typical parts, such as shaft, sleeve and sphere, are selected as study objects. On the basis of enough information, the models of thermal distribution of parts are provided in terms of theory on heat conduction. Applying elasticity and thermal elasticity, thermal stress and thermal deformation are computed. So, the theories of heat conduction, elasticity and thermal elasticity are used together.The focus of this paper is to analyze the thermal deformation of spindle and clearance of bearing, at the same time, the computing method is presented in theory. The thermal deformation during grinding is studied, then, some practical and effective methods are given. At last, different heating ways are carried out to obtain enough data with elements of different materials and shapes in experiments. Some new ideas are introduced according to the analysis of experimental results. The paper is of importance to later research on non-uniform temperature distribution.