Precision machining is accomplished by using precision machine tools, precision measuring tools and measuring instruments under strictly controlled environmental conditions. Machining accuracy reaching and exceeding 0.1 micron is called ultra-precision machining.

The technological functions of precision machining are:

①The geometry and mutual azimuth accuracy of the parts reach the micron or arc second level;

②The distance or feature size tolerance of parts is below micron;

③The microscopic unevenness of the surface of the part (the uniform height difference of the surface unevenness) is less than 0.1 microns;

④ Mutual accessories can meet the requirements of cooperation;

⑤Some parts can also meet the requirements of precise mechanics or other physical characteristics;

In the aerospace industry, precision machining is mainly used to process precision mechanical parts in aircraft control equipment, such as precision cooperating parts in hydraulic and pneumatic servo mechanisms, gyroscope structures, shells, air and liquid bearing components, and Float and so on. The precision parts of aircraft have messy structure, low rigidity, high precision requirements, and difficult-to-process materials account for a large proportion.

What are the specific requirements for materials for precision mechanical parts processing?

1. Requirements for data hardness

In some cases, the higher the hardness, the better the material, but for precision mechanical parts processing, the material can only be limited to the hardness of the lathe tool. If the material is harder than the lathe tool, it cannot be processed. .

2. The data should be moderately soft and hard

The machining data of precision mechanical parts must be at least lower than the hardness of the lathe tool. At the same time, it is necessary to understand the purpose of precision mechanical parts, so as to choose a suitable lathe tool for processing.

3. Pay attention to the density of data

Before processing precision mechanical parts, you must pay attention to the density of the data. If the density is too high, the hardness is also very large, but the hardness exceeds the hardness of the lathe tool, and the processing cannot be performed, not only the damaged lathe tool, It will also cause dangers such as broken turning of the turning tool.

Precision machining has certain requirements for the quality of the material, and not all materials are suitable. If the material is too soft, there is no need for precision machining. If the material is too hard, the lathe tool cannot be processed. In short, when processing precision mechanical parts, the hardness of the processing materials must be lower than the hardness of the lathe tool to perform precision machining.