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Experimental Identification of Convective Heat Transfer in Machine Tools

by the thermal deformation state of the machine tool structure. Thus it is very important, in machine tool design, to have a good knowledge of the relation between temperature field and deformation. Consequently, it is important to know the relations among the ways of heat transfer through the structure. In the past, convective heat transfer was rather neglected compared to conductive heat transfer. With increasing accuracy the convective part of heat transfer needs to be taken into account. The phenomenon of convective heat transfer between a solid part and an ambient fluid is described by the heat transfer coefficient (HTC). Due to its complexity, this physical quantity needs to be evaluated experimentally, especially under the conditions of machine tool applications. The experimental approach is important in providing valuable data for the improvement of computational models. The paper describes a technique that is being developed for direct evaluation of HTC in machine tool applications. The method is based on a balance of thermal fluxes through a probe itself. Calibration of the probe is necessary. The experiments and tests performed on the latest probe design are described and previous measurements and results are discussed.