Explanation on Heat Treatment and Precision of Changzhou Machining Process

Content 1: Heat treatment in parts machining process

The heat treatment in the machining process of parts 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 in order to prepare for final heat treatment, generally including annealing, normalizing, tempering, and aging treatment. Perform preliminary heat treatment, typically after rough machining.

Final heat treatment: The purpose is to improve the hardness and wear resistance of parts, including quenching, carburizing, nitriding, and other processes. It is generally performed after semi finishing and before finishing.

Content 2: Machining accuracy

The accuracy of machining is mainly reflected in the following aspects: dimensional accuracy, geometric accuracy, and mutual positional accuracy. The geometric accuracy includes roundness, straightness, and flatness, while the mutual positional accuracy includes parallelism, perpendicularity, and coaxiality.

Content 3: What are the methods for obtaining machining accuracy?

Dimensional accuracy: There are mainly trial cutting method, adjustment method, sizing method, and automatic control method.

Geometric shape accuracy: There are mainly such methods as trajectory method, molding method, and generation method.

Mutual position accuracy: There are mainly direct installation methods, alignment installation methods, and fixture installation methods.