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 I will introduce what is called non-standard parts it.
First of all, we know that non-standard parts are proposed relative to standard parts, so before understanding non-standard parts we need to know what is meant by standard parts. Standard parts refer to the structure, size, drawing, marking and other aspects have been completely standardized, and the common parts produced by professional factories, like 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 the 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 to elaborate is mainly the state did not set out strict standard specifications, no relevant parameters outside the provisions of the enterprise free control of other accessories. There are many varieties of non-standard parts, 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 prescribed by the customer, there is no certain paradigm. Products from casting to finishing completely need the corresponding quality control, the process is complex 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.