We know that precision machining can be divided into standard parts processing and non-standard parts processing according to the processing objects. Relatively speaking, standard parts processing is relatively easy. Non-standard parts processing is relatively difficult, and many people do not Distinguish what is standard and what is non-standard
First of all, we know that non-standard parts are proposed relative to standard parts, so we must know what is called standard parts before we understand non-standard parts. Standard parts refer to components that have been completely standardized in terms of structure, dimensions, drawing, marking, etc., and are commonly used by professional manufacturers, such as threaded parts, rolling bearings, and the like. Generalized include standardized fasteners, fasteners, transmissions, seals, hydraulic components, pneumatic components, bearings, springs and other mechanical parts. The narrow sense only includes standardized fasteners. The commonly known standard part in China is the abbreviation for standard fasteners, which is a narrow sense concept, but it cannot exclude the existence of generalized concepts. In addition there are industry standard parts, such as automotive standard parts, mold standard parts, etc., also belong to the broad standard parts.
Non-standard parts processing professionals elaborate mainly on the fact that the country has not set strict standard specifications, and there are no other related parameters, and other accessories freely controlled by the company. There are many varieties of non-standard parts, there is no very standardized classification. Roughly classified as follows:
Non-standard metal parts:
Drawings provided by customers, manufacturers use the equipment according to the drawings to produce the corresponding products, usually the majority of molds, tolerance requirements, finishes are specified by the customer, there is no certain paradigm. From casting to finishing, the product completely requires corresponding quality control, the process is complex and the variability is large, and the general cost is higher than the standard part.
Non-metallic non-standard parts:
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 NC reference, making non-standard processing costs and tolerance levels have greatly improved