Precision machining is a process of altering the shape, size, or performance of workpieces using machining equipment. According to the temperature state of the workpiece being processed, it is divided into cold working and hot working. Generally, cold working is performed at room temperature and does not cause chemical or phase changes in the workpiece. Hot working typically occurs at temperatures above or below room temperature, leading to chemical or phase changes in the workpiece. Cold working can be further categorized into cutting and pressure processing. Hot working commonly includes heat treatment, forging, casting, and welding.