Operation steps and normal temperature state of precision machining

Precision machining is a process of using processing machinery to change the shape or performance of a workpiece. According to the temperature state of the workpiece to be processed, it can be divided into cold processing and hot processing during use. Generally processing at room temperature, and does not cause chemical or phase changes of the workpiece, it is called cold processing.

Precision machining is generally higher or lower than normal temperature processing, which will directly cause the chemical or phase change of the workpiece, which is called thermal processing. Cold processing can be divided into cutting processing and pressure processing according to the difference in processing methods. Thermal processing commonly includes heat treatment, forging, casting and welding. The first is the requirement for the hardness of the material. For some occasions, the higher the hardness of the material, the better, but it is limited to the hardness requirements of the machined part. The machined material should not be too hard. If it is harder than the machine part, it cannot be machined.
Operation steps of precision machining
1. Finishing processing: This processing principle is roughly some grinding and polishing processing, which is usually a step after the product has completely completed the structure.
2. Face first, hole second: When making precision mechanical parts, for workpieces such as brackets, it needs to perform plane processing and mechanical hole processing. In order to make the precision error of the processed hole smaller, Machining the plane first and then machining the hole is helpful to reduce the error.
3. Divide the processing stage: when the product is in precision mechanical parts, different degrees of processing are required according to different product requirements, and the degree of processing needs to be divided. If the accuracy requirements are not high, then a simple roughing stage That's it. Product schedule requirements are becoming stricter and stricter, and semi-finishing and finishing stages will be carried out in the follow-up.
4. Benchmark first: When using mechanical equipment to process the product, a datum plane must be determined, so that there can be a positioning reference during subsequent processing. After the datum plane is determined, the datum plane must be set first Processed out. In precision mechanical parts, many workpieces are not produced at one time, but when the workpiece is produced, it is just a rough model.