Fast Identification Method of the Heat Transfer Coefficient

Abstract

The demands on machining accuracy have been increasing lately and therefore research of thermal behaviour of machine tool structures is crucial for successful manufacturing. Generated heat diffuses into the structure of the machine tool components, this process is affected by heat sinks such as heat transfer on the surfaces and cooling systems. Meanwhile the heat warms up the structure of the machine tool and thermal dilatation deforms the structure, which subsequently affects machining accuracy in a negative way. Different systems are used to eliminate the thermal error, but their efficiency corresponds to the quality of the thermal machine tool model. The key problems of machine tool thermal error reduction are in the thermal model itself, in the fast, or even real-time, identification of the heat sources and the heat transfer coefficients on the surfaces. This paper brings up a new fast identification method of the heat transfer coefficient, which is founded on an analytical description of the heat transfer in a thin plate. The method is easily applicable on existing structures at a low cost