关键词: 热变形误差；形体热变形系数；精确热膨胀系数；非相似性；最佳热配合

Abstract:

In the field of precision mechanism and engineering technology, the thermal deformation errors are often the dominate cause among the factors affecting the accuracy. After years of experimental and theoretical study of the thermal deformation, the authors presented the following theories: thermal deformation coefficient of the part, precise thermal expansion coefficient, non-similarity in thermal deformation of the part, optimal thermal fitting theory of the hole and shaft, and briefly introduced self-developed high-accuracy four-dimensional experimental equipment of the thermal deformation.Finally the main problems being studied subsequently of the thermal deformation theory in the field of precision mechanism was also presented.

Key words: thermal deformation error, thermal deformation coefficient of the part, precision thermal expansion coefficient, non-similarity, optimal thermal fitting