Precision machining is a process that alters the shape, size, or performance of workpieces using machining equipment. Depending on the temperature state of the workpiece being processed, it is divided into cold working and hot working. Generally, it is processed at room temperature without causing any chemical or phase changes in the workpiece, which is referred to as cold working. Typically, processing at temperatures above or below room temperature will induce chemical or phase changes in the workpiece, known as hot working. Cold working can be further categorized into cutting and pressure processing. Hot working commonly includes heat treatment, forging, casting, and welding.