Thermal Expansion of a Leadscrew

概要

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A leadscrew which is used in an up-to-date machine tool, measuring machine and so on requires very high accuracy. In practical use, a leadscrew may thermally expand due to heat sources such as an oil tank or undoubtedly to frictional heat between the leadscrew and the mating nut. Thermal expansion of a leadscrew lowers the working accuracy of the machine, as if the latter has a pitch error. This paper treats experimental and theoretical analysis on the thermal expansion of leadscrews which are used in a thread grinder and a thread cutting lathe. As the result, the following are clarified. (1) Theoretical analysis of temperature-rise and thermal expansion due to frictional heat shows good agreement with the experimental results. (2) Thermal expansion of a leadscrew mounted on a thread grinding machine is much influenced by the heat sources such as an oil tank as well as the frictional heat. (3) Thermal expansion of a leadscrew mounted on a screw cutting lathe is exclusively influenced by the frictional heat.
一般社団法人日本機械学会の論文