Explanation of heat treatment and accuracy in CNC machining

There are a lot of common sense of machining, but for us, these common sense are not enough to sum up, and there will always be something missing. Therefore, it is necessary to make up for and update the common sense, so that we can grasp more updated common sense in time, so as to have a complete and detailed understanding of machining.

Content 1: heat treatment in part machining technology

Heat treatment in part machining technology can usually be divided into preparation heat treatment and final heat treatment.

Preparation for heat treatment: it is intended to improve mechanical properties and eliminate internal stress in order to prepare for final heat treatment. It usually includes annealing, normalizing, quenching and tempering, aging treatment and other technologies. Prepare for heat treatment, usually after rough machining.

Final heat treatment: it is intended to improve the hardness and wear resistance of parts, including quenching, carburizing, nitriding and other technologies, which are usually carried out after semi finishing and before finishing.

Content 2: machining accuracy

The accuracy of machining is mainly reflected in the following aspects: scale accuracy, a few shape accuracy and mutual azimuth accuracy. Among them, a few shape accuracy includes roundness, straightness and flatness, and mutual azimuth accuracy includes parallelism, straightness and coaxiality.

Content 3: what are the methods to obtain machining accuracy?

Scale accuracy: there are mainly trial cutting method, adjustment method, scaling method and automatic control method.

A few shape accuracy: there are mainly orbit method, forming method and expansion method.

Mutual orientation accuracy: there are mainly direct installation method, alignment installation method and fixture installation method.

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