Precision machining is a process that alters the shape, size, or performance of workpieces using machine tools. It is divided into cold processing and hot processing based on the temperature state of the workpiece being processed. Generally conducted at room temperature without causing chemical or phase changes in the workpiece, it is referred to as cold processing. Processing above or below room temperature typically induces chemical or phase changes in the workpiece, known as hot processing. Cold processing can be further classified into cutting and forging methods. Hot processing commonly includes heat treatment, forging, casting, and welding.