School of Mechanical Engineering, Soongsil University, Seoul 06978, Korea.
Sensors (Basel). 2020 Oct 20;20(20):5916. doi: 10.3390/s20205916.
This paper describes a method for calibrating in-plane center alignment error (IPCA) that occurs when installing the circular motion slide (CMS). In this study, by combini ng the moving carriage of the CMS and the planar PKM (parallel kinematic mechanism) with the machine tool, the small workspace of the PKM is expanded, and the workpiece is placed on the table with the CMS installed is processed through the machine tool. However, to rigidly mount the CMS on the table, the preload between the guide and the support bearings must be adjusted with the eccentric bearing, and in this process, the IPCA occurs. After installing a reflective marker on the PKM, the PKM is slowly rotated along with the ring guide in the way of stop-and-go without the PKM's own motion. Then, using a machine vision camera installed at the top of the CMS, the IPCA, which is the difference between the actual center position and the nominal center position of the CMS with respect to the camera, can be successfully calibrated through the circular fitting process. Consequently, it was confirmed that the IPCA of 0.37 mm can be successfully identified with the proposed method.
本文介绍了一种校准安装圆形运动滑台 (CMS) 时发生的面内中心对准误差 (IPCA) 的方法。在这项研究中，通过将 CMS 的移动滑座和平面 PKM（并联运动机构）与机床相结合，扩展了 PKM 的小工作空间，并通过机床对安装有 CMS 的工作台上面的工件进行加工。然而，为了将 CMS 刚性地安装在工作台上，必须用偏心轴承调整导套和支撑轴承之间的预紧力，在此过程中会发生 IPCA。在 PKM 上安装反射标记后，PKM 会沿着带有止动功能的环形导套缓慢旋转，而无需 PKM 自身运动。然后，通过安装在 CMS 顶部的机器视觉相机，通过圆形拟合过程，可以成功校准 CMS 相对于相机的实际中心位置和标称中心位置之间的 IPCA，即 IPCA。因此，已经证实，通过所提出的方法可以成功识别出 0.37mm 的 IPCA。
