In production practice, it is often encountered that the processing of holes that are equally divided on the circumference is encountered. For example, the key part of the ladle turret of the slab continuous casting machine--the pin wheel wheel body, the 80-φ65H7 pin hole on the wheel body has higher dimensional accuracy and position accuracy, mainly because it can affect the entire ladle turret The smoothness of operation and the accuracy of the positioning of the ladle, so the machining accuracy of the 80-φ65H7 pin hole on the wheel body is the key factor to ensure the smooth operation of the rotary table. According to the existing equipment and processing capacity of our factory, the pin wheel wheel body was originally set to stand sideways and fixed on the W200HC boring and milling machine. The pin hole was processed by the automatic digital display device of the boring and milling machine and the spindle of the mobile machine tool. Considering that the diameter of the wheel body is large (φ2880mm), the number of circumference divisions is large, and due to the various parts of the machine tool
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