​Precision metal parts processing, not all materials can be precision processed, for example, if some materials with too high hardness exceed the hardness of the machined parts, some special materials are not suitable for precision precision processing, so precision processing has some effects on the material.

What are the specific requirements? Let me introduce to you as follows:

The first is the requirement of material hardness. 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 machined material should not be too hard. If it is harder than the machine part, it cannot be processed.

Secondly, the material is moderately hard and soft, at least one grade lower than the hardness of the machine part. At the same time, it also depends on the purpose of the processed device and the rational selection of the machine part.

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, the basic one is to pay attention to the density of the material before processing in the mechanical parts processing plant. If the density is too large, the hardness is also large, and if the hardness exceeds the hardness of the machine (lathe tool), it cannot be processed. , Not only will damage the parts, but also cause danger, such as the turning tool flying out and hurting people. Therefore, in general, for mechanical processing, the material material must be lower than the hardness of the machine knife in order to be processed.

For precision parts processing, the main size requirements, such as the diameter of the cylinder, have strict requirements, and the positive and negative errors are within the specified requirements to be qualified parts, otherwise they are unqualified parts; there are also specific and strict requirements for length, width and height. There are also regulations for positive and negative errors. For example, if the diameter of a built-in cylinder (take a simple basic component as an example) is too large and exceeds the allowable error range, it will cause the situation that it cannot be inserted. If the actual diameter is too small If the lower limit of the allowable negative value of the error is exceeded, the insertion will be too loose and the problem of not firmness will occur. These are unqualified products, or the length of the cylinder is too long or too short, which exceeds the allowable range of error. They are all unqualified products. They must be discarded or reprocessed, which will inevitably increase the cost.