The main reason for machining errors

1. The manufacturing error of the machine tool The manufacturing error of the machine tool mainly includes the spindle rotation error, the guide rail error and the transmission chain error. Spindle rotation error refers to the variation of the actual rotation axis of the spindle relative to its average rotation axis at each moment, which will directly affect the accuracy of the processed workpiece. The main reasons for the spindle rotation error are the spindle coaxiality error, the bearing itself error, the coaxiality error between the bearings, and the spindle winding. The guide rail is the benchmark for determining the relative positional relationship of various machine tool components on the machine tool, and it is also the benchmark for machine tool movement. The manufacturing error of the guide rail itself, the uneven wear of the guide rail and the installation quality are important factors that cause the guide rail error. Transmission chain error refers to the error of the relative movement between the transmission elements at both ends of the transmission chain. It is caused by the manufacturing and assembly errors of each component of the transmission chain, as well as the wear during use


2. The geometric error of the tool. Any tool will inevitably wear out during the cutting process, which will cause the size and shape of the workpiece to change. The influence of tool geometry error on machining error varies with the type of tool: when using fixed-size tools for machining, the tool manufacturing error will directly affect the machining accuracy of the workpiece; and for general tools (such as turning tools, etc.), the manufacturing error No direct influence on machining errors