Explanation of Heat Treatment and Precision in Changzhou Mechanical Processing Technology
Content 1: Heat treatment in part machining process
The heat treatment in the machining process of parts can generally be divided into two types: preparatory heat treatment and final heat treatment.
Preparation heat treatment: Its purpose is to improve mechanical properties, eliminate internal stress, and prepare for final heat treatment, generally including annealing, normalizing, quenching and tempering, and aging treatment. Preparation heat treatment is usually carried out after rough machining.
Final heat treatment: Its purpose is to improve the hardness and wear resistance of the parts, including quenching, carburizing, nitriding and other processes, which are generally carried out after semi precision machining and before precision machining.
Content 2: Precision of Mechanical Processing
The accuracy of mechanical processing is mainly reflected in the following aspects: dimensional accuracy, geometric shape accuracy, and mutual position accuracy. Geometric shape accuracy includes roundness, straightness, and flatness, while mutual position accuracy includes parallelism, verticality, and coaxiality.
Content 3: What are the methods to obtain machining accuracy?
Dimensional accuracy: There are mainly methods such as trial cutting, adjustment, sizing, and automatic control.
Geometric shape accuracy: There are mainly methods such as trajectory method, forming method, and generative method.
Mutual position accuracy: There are mainly methods such as direct installation, alignment installation, and fixture installation.