What causes the failure of precision parts processing?

When processing precision parts, the quality of the product will be affected by various reasons, eventually leading to product processing failure. There are several reasons for this consequence, so now let's briefly talk about the analysis of the reasons for the failure of precision parts processing?
The reasons for product failure can be summarized into four aspects: material, installation and use, processing and design.
1. Material reasons Improper material selection is the main cause of material failure. The most common thing is that designers make decisions based only on the general performance indicators of the material, and defects in the material itself are also the reason.
2. When installing and using parts that have failed, too loose or too tight fit, improper fixation, poor alignment and improper operation may cause failure.
3. In terms of processing, poor control of the processing technology will cause various defects and cause failure. For example, improper control of the heat treatment process leads to overheating, insufficient tempering, decarburization, etc. Overheating or overburning, etc. Poor cold processing technology will cause the finish to be too low, the tool marks to be too deep, grinding cracks, etc., which can lead to the failure of the parts.
4. The first design reason is that the parts fail due to unreasonable design structure and shape. For example, there are obvious stress concentration sources in the high-stress areas of the parts. The second is an error in estimating the working conditions of the parts, such as underestimating possible overloads during work, resulting in insufficient load-bearing capacity of the designed parts.