Efficient and generalized method for measurement and evaluation of thermal deviation characteristics in Multi-task machine

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The purpose of this research is to establish the method for measurement and evaluation of thermal deviation characteristics caused by feed motions in Multi-task machine. The followings are revealed by this research.1. The measuring systems for evaluation of thermal deviation characteristics caused by linear motion in Z or X direction were developed for a multi-task machine. Using these systems, the characteristics were actually evaluated for liner motions (X or Z axis) and swing motion (B axis). Since these evaluation results corresponded to the structural form and the location of heat sources in the machine, the validity of this proposed method was clarified.2. The estimation of the thermal deformation mode is possible with synthetic evaluation of the measurement results and the information, such as a structural form of the machine. Since this estimation result corresponded to the temperature changes measured at some locations in the machine during the test, the validity of the estimation was clarified.3. For the standardization of this proposed method, the tests for each motion were done with two kinds of the measuring system. As the results, the followings were made clear.1) Using the target fixture in Z direction, the thermal deviation characteristics are evaluated sufficiently2) Since the location of this Z target fixture corresponds to the workpiece position, influence of the thermal deviations on the machining accuracy is evaluated directly3) To evaluate the thermal deformation mode and its mechanism more clearly, it is necessary to do the tests with the X target fixture in addition to the Z target fixture, and to evaluate the both results synthetically.4) Test with the Z target fixture is appropriate for the standardization of this proposed method.