1. Precision machining generally refers to the machining method with machining accuracy up to 1 micron.

2. Precision machining is realized by using precision machine tools, precision measuring tools and meters under strictly controlled environmental conditions.

3. Precision machining mainly includes fine turning, fine boring, fine milling, fine grinding and grinding.

4. The process effect of precision machining is:

① The geometric shape and mutual position accuracy of parts reach micron or angular second level;

② The boundary or feature dimension tolerance of parts is less than micron;

③ The micro unevenness of part surface (average height difference of surface unevenness) is less than 0.1 micron;

④ Mutual fittings can meet the requirements of combining force;

⑤ Some parts can also meet the requirements of accurate mechanical or other physical properties.

Production process refers to the whole process of making products from raw materials (or semi-finished products). For machine production, it includes the transportation and preservation of raw materials, production preparation, blank manufacturing, parts processing and heat treatment, product assembly, commissioning, painting and packaging, etc. The content of production process is very extensive. Modern enterprises use the principles and methods of system engineering to organize and guide production. Dalian precision machining regards the production process as a production system with input and output. It can make the management of the enterprise scientific and make the enterprise more adaptable and competitive

In the production process, the process of directly changing the shape, size and performance of raw materials (or blanks) into finished products is called technological process. It is the main part of the production process. For example, casting, forging and welding of blanks; Heat treatment to change material properties; The machining of parts belongs to the process. The technological process is composed of one or several sequential processes.

Process is the basic unit of technological process. The so-called process refers to the part of the process that is continuously completed for one or a group of workpieces in a working place. The main feature of a process is that the processing object, equipment and operator are not changed, and the content of the process is completed continuously.

Production types production types are usually divided into three categories

1. Single piece production produces a part individually and rarely repeatedly.

2. The production of manufacturing the same parts in batches.

3. Mass production when the manufacturing quantity of products is large, most workplaces often repeat the production of a certain process of a part.

When drawing up the process of parts, due to different production types of parts, the processing methods, machine tools and equipment, clamping and measuring tools, blanks and technical requirements for workers are very different.