Explanation of heat treatment and precision of mechanical processing technology, Nanjing Precision Engineering Co., ltd
There is already a lot of knowledge about mechanical processing, but for us, this knowledge is not enough to be comprehensively summarized, and there will always be omissions. Therefore, knowledge needs to be supplemented and updated, so that we can master more updated knowledge in time, so as to have a comprehensive and detailed understanding of mechanical processing.
Content 1: Heat treatment in parts precision machining process heat treatment in parts machining process can generally be divided into two types: preliminary heat treatment and final heat treatment.
Preliminary heat treatment: its purpose is to improve mechanical properties and eliminate internal stress so as to prepare for final heat treatment, which generally includes annealing, normalizing, quenching and tempering and aging treatment.
Preliminary heat treatment is usually carried out after rough machining.
Final heat treatment: its purpose is to improve the hardness and wear resistance of parts, including quenching, carburizing, nitriding and other processes, which are generally carried out after semi-finishing and before finishing.
Content 2: precision of mechanical processing the precision of mechanical processing is mainly reflected in the following aspects: dimensional precision, geometric shape precision and mutual position precision, among them, geometric shape accuracy includes roundness, straightness, flatness, etc. Mutual position accuracy includes parallelism, verticality, coaxiality, etc.
Content 3: What are the methods to obtain machining accuracy?
Dimensional accuracy: There are mainly trial cutting method, adjustment method, sizing method and automatic control method.
Geometric Shape Accuracy: There are mainly trajectory method, molding method and expansion method.
Mutual position accuracy: There are mainly direct installation method, alignment installation method and fixture installation method.
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