We know that precision machining according to the processing object can be divided into standard parts processing and non-standard parts processing, relatively speaking, standard parts processing is relatively easy, while the processing of non-standard parts is relatively difficult, many people do not distinguish what is standard parts what is non-standard parts, then the next to introduce what is called non-standard parts it!
First of all, we know that non-standard parts are relative to the standard parts proposed, so before understanding the non-standard parts we need to know what is called standard parts.
Standard parts are the structure, size, drawing, marking and other aspects have been completely standardized, and the common parts produced by professional factories, such as threaded parts, rolling bearings, etc.. In a broad sense, it includes standardized fasteners, links, transmission parts, seals, hydraulic components, pneumatic components, bearings, springs and other mechanical parts. Narrow sense only includes standardized fasteners. Domestic commonly known as standard parts is the abbreviation of standard fasteners, is a narrow concept, but can not exclude the existence of a broad concept. In addition there are industry standard parts, such as automotive standard parts, mold standard parts, etc., also belong to the broad sense of standard parts.
Non-standard parts processing professionals elaborate mainly the state did not set out strict standard specifications, no relevant parameters beyond the provisions of the enterprise free control of other accessories. There are many varieties of non-standard parts, and there is no very standard classification. Roughly classified as follows.
Metal non-standard parts:
By the customer to provide drawings, manufacturers according to the drawings using equipment to produce the corresponding products, usually the majority of molds, tolerance requirements, finish are specified by the customer, there is no certain paradigm. The products need corresponding quality control from casting to finishing, the process is complicated and variable, and the general cost is higher than standard parts.
Non-metallic non-standard parts.
It is the processing of some non-metallic materials. Such as plastic, wood, stone, etc. In recent years, the injection molding industry, the development of plastic molds increasingly sophisticated, surface design, programming CNC references, so that the cost of non-standard processing and tolerance levels have been greatly improved.