一、概况我厂设备M1450型万能外圆磨床是1963年上海机床厂出产的产品。由于年久失修,精度丧失,特别是对一些精度较高的内孔磨削,只好依靠夹具的精度来弥补,这样辅助时间长,精度不稳定,操作极不方便,有些高精度的内孔就无法加工。例如我厂产品零件φ500分度板(图1)的内孔为290mm,锥度1:3,孔长60mm。要求不圆度不超过2μm,用塞规涂色检查接触面在80％以上,光洁度▽8,无振纹。材料为耐磨铸铁。由于机床的精度差,长期以来不能稳定生产,有时最后要用研磨来弥补。为此,1982年6月我们对该机床进行了全面改装,其中重点对头架进行了结构改进,使头架的几项主要精度大幅度的提高,头架改 First, an overview of our plant M1450 Universal Cylindrical Grinder 1963 Shanghai Machine Tool Works produced products. As a result of disrepair, loss of precision, especially for some high precision bore grinding, had to rely on the accuracy of the fixture to make up, so aided a long time, the accuracy of instability, the operation is very inconvenient, and some high-precision bore Unable to process. For example, my factory product parts φ500 indexing board (Figure 1) bore 290mm, taper 1: 3, hole length 60mm. Requires non-roundness of not more than 2μm, with Cypriot coloring check the contact surface in more than 80%, finish ▽ 8, no vibration pattern. Material is wear-resistant cast iron. Due to the poor precision of the machine tool, it has not been possible for a long time to be produced in a stable manner and, at the end, it is sometimes used to make up with grinding. To this end, in June 1982 we carried out a comprehensive conversion of the machine tool, focusing on the structure of the head frame has been improved so that the head frame of several major precision greatly improved,