Compensation Method for Tool Setting Errors Based on Non-Contact On-Machine Measurement
Compensation Method for Tool Setting Errors Based on Non-Contact On-Machine Measurement
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DOI：
10.20965/ijat.2020.p0066
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发表时间：
2020-01-01
影响因子：
1.1
通讯作者：
Takeuchi, Yoshimi
中科院分区：
文献类型：
--
作者：
Xu, Meng;Nakamoto, Keiichi;Takeuchi, Yoshimi
光学零件的高精度制造需要高度集成的超精密切削技术。然而，由于加工对象的小型化和复杂化，各种微小的误差会对加工精度产生不利影响。在这些误差中，微小的设置误差严重影响加工精度，因为很难将刀具精确地放置在超精密机床上。进行了基于对刀误差补偿的多轴联动超精密切削加工。在这种补偿方法中，工件必须在试切后从机床上取下，以测量槽，从而检测实际刀具位置并计算设置误差。然而，工件被移除后，无法在超精密机床上完美更换。这使得难以自动进行设定误差补偿。为了解决这些问题，必须在不移除工件的情况下检测刀具定位。因此，在本研究中，开发了一种新的补偿方法，通过非接触测量与激光成像设备。此外，为了提高补偿性能，在超精密机床上对激光成像装置进行了标定。所提出的方法可以直接检测实际的刀具位置和机床坐标系上的刀具中心点坐标的计算。通过修改数控程序，最终实现对对刀误差的补偿。最后，进行了开槽实验，验证了该补偿方法的可行性。
The high-accuracy manufacturing of optical requires highly integrated ultraprecision cutting technologies. However, all sorts of small errors adversely affect machining accuracy because of the miniaturization and complexity of objects. Among these errors, slight setting errors critically impact machining accuracy because it is difficult to place a cutting tool accurately on a ultraprecision machine tool. The authors have conducted multi-axis control ultraprecision cutting based on tool setting errors compensation. In this compensation method, the workpiece must be removed from the machine tool after test cutting to measure grooves to detect actual tool positions and to calculate setting errors. However, after the workpiece is removed, it cannot be perfectly replaced on a ultraprecision machine tool. This makes it difficult to automate setting errors compensation. In order to solve these problems, tool positioning must be detected without removing the workpiece. Therefore, in this study, a novel compensation method is developed by means of non-contact measurement with a laser imaging device. Furthermore, in order to improve compensation performance, a laser imaging device is calibrated on an ultraprecision machine tool. The proposed method enables direct detection of actual tool position and calculation of the tool centerpoint coordinate on the machine coordinate system. By modifying an NC program, the tool setting errors can be finally compensated. The feasibility of the proposed compensation method is verified by conducting experiments of creating grooves.