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

本研究的目的是建立多任务机床中由进给运动引起的热偏差特性的测量和评价方法。本研究得出以下结论：研制了多任务机床Z、X方向直线运动热偏差特性测量系统。使用这些系统，实际评估了直线运动（X或Z轴）和摆动运动（B轴）的特性。由于这些评价结果与机器的结构形式和热源位置相对应，因此证明了该方法的有效性。通过对测量结果和机器结构形式等信息的综合评价，可以估计出热变形模式。由于该估计结果与试验过程中在机器某些位置测量到的温度变化相对应，因此该估计的有效性得到了澄清。为了使所提出的方法标准化，用两种测量系统对每个运动进行了测试。结果表明：1)使用目标固定在Z方向,热偏差特征评估sufficiently2),因为这个目标Z夹具的位置对应于工件的位置,加工精度上的热偏差的影响评估directly3)来评估热变形模式及其机制更清楚,有必要用X做测试夹具除了Z靶装置,综合和评价的结果。4)用Z型目标夹具进行测试适合于本方法的标准化。

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.