In the process of parts processing and manufacturing, due to the different production requirements and conditions of various parts, their manufacturing process plans are also different. When the same parts are produced using different process plans, their production efficiency and economic benefits also differ.

Precision machining of parts is not possible for all materials. Some materials have a hardness that exceeds the hardness of the machining machine, which may cause the machine to collapse. Therefore, these materials are not suitable for precision machining, unless they are made of special materials or laser cutting.

The processed materials are divided into two categories: metallic materials and non-metallic materials. For metallic materials, stainless steel has the highest hardness, followed by cast iron, followed by copper, and finally aluminum. The processing of ceramics, plastics, and other materials belongs to the processing of non-metallic materials.

The requirement for material hardness is that in some cases, the higher the hardness of the material, the better. However, it is limited to the hardness requirements of the machined parts, and the processed material cannot be too hard. If it is even harder than the machined parts, it cannot be processed. The material should be moderately soft and hard, at least one grade lower than the hardness of the machine parts, and it also depends on the purpose of the processed components, and the reasonable selection of materials for the machine parts.