Materials used for precision machining are divided into two categories, metallic materials and non-metallic materials. For metal materials, the hardness is stainless steel the highest, followed by cast iron, followed by copper, and finally aluminum. The processing of ceramics, plastics, etc. belongs to the processing of non-metallic materials.
1. The first is the requirement for the hardness of the material. For some occasions, the higher the hardness of the material, the better, but it is limited to the hardness requirements of the machined parts. The processed material cannot be too hard. If it is harder than the machined parts, it cannot be processed.
2. Secondly, the material should be moderately soft and hard, at least one grade lower than the hardness of the machine parts. At the same time, it also depends on the function of the machined parts and the reasonable selection of materials for the parts.
In short, precision machining still has some requirements for materials, not all materials are suitable for processing, such as materials that are too soft or too hard, the former is not necessary for processing, while the latter cannot be processed.
Therefore, you must pay attention to the density of the material before processing. If the density is too high, it is equivalent to a large hardness. If the hardness exceeds the hardness of the machine parts (lathe turning tools), it cannot be processed, which will not only damage the parts, but also It will cause danger, such as the knife flying out and hurting people. Therefore, in general, for mechanical processing, the material quality should be lower than the hardness of the machine tool, so that it can be processed.