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A few important introductions to the effects of precision machining processes

2022-10-13

What is precision machining? It is a process of changing the external dimensions or properties of a workpiece with machining machinery. It can be divided into cold machining and hot machining.

Cold machining is generally done at room temperature and does not cause chemical or physical changes in the workpiece. Processing at a temperature higher or lower than room temperature generally causes chemical or physical changes in the workpiece and is called thermal processing. Cold machining can be divided into cutting and pressure machining according to the difference of processing methods. Hot working commonly includes heat treatment, forging, casting and welding.

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The process effects of precision machining are as follows.

1, the geometry and mutual position accuracy of the part to micron or arc second level ;

2, the boundaries of the part or feature size tolerance in microns or less;

3, the part surface microscopic unevenness (surface unevenness average height difference) is less than 0.1 micron;

4, the mutual parts can meet the requirements of the fit force;

5, some parts can also meet the precise mechanical or other physical characteristics of the requirements, such as the torsional stiffness of the float gyroscope torsion bar, the stiffness coefficient of the flexible components, etc..

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Precision machining is achieved under strictly controlled environmental conditions, using precision machine tools and precision gauges and gauges. Machining accuracy up to and beyond 0.1 micron is called ultra-precision machining. In the aerospace industry, precision machining is mainly used to process precision mechanical parts in aircraft control equipment, such as precision mating parts in hydraulic and pneumatic servo mechanisms, gyroscope frames and housings, air and liquid float bearing assemblies and floats, etc. The structure of precision parts of aircraft is complex, small stiffness, high precision required, and the proportion of difficult to machine materials is large.

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A few important introductions to the effects of precision machining processes

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