A Study on the Effect of Surface Color in Regard to Thermal Deformation of a Machine Tool : Experiment Using a Practical Machine and Investigation in Case of a Structure with Coating Box Elements

Abstract

As higher precision machining is required, reducing the thermal deformation of a machine tool becomes more important. Hence, in the previous report, the relationship between thermal radiation and surface color has been experimentally investigated. And some results was concluded; there was the relationship between thermal radiation and surface color on an ordinary temperature and the heat transfer was influenced significantly from the thermal radiation, in addition, the accuracy of the bench lathe model was also affected by its surface color. In this report, the relationship between thermal deformation and surface color on a practical NC milling machine has been experimentally investigated and the relationship between thermal deformation and surface color of a structure with some coating box elements has been also investigated by FEM analysis. It is concluded from the results that surface color of a machine structure is effective in order to reduce thermal deformation on the practical machine and thermal deformation of a machine tool is influenced significantly from combination of color on the surfaces which are front and rear surfaces on the box wall and a structural surface.