We know that precision machining can be divided into standard parts processing and non-standard parts processing according to the processing object. It is relatively easy to process standard parts, but it is relatively difficult to process non-standard parts. Many people do not know what is standard parts and what is non-standard parts. Then it is up to us, Grace. Chief Engineer will introduce to you what is called non-standard parts:
. First of all, we know that non-standard parts are proposed relative to standard parts, so we need to know what is called standard parts before we understand non-standard parts. Standard parts refer to parts and components, such as threaded parts, rolling bearings and so on, which have been completely standardized in structure, size, drawing, marking and other aspects and are produced by professional factories. Generally speaking, it includes standardized fasteners, connectors, transmission parts, seals, hydraulic components, pneumatic components, bearings, springs and other mechanical parts. In a narrow sense, only standardized fasteners are included. The standard parts commonly known in China are abbreviated as standard fasteners, which are narrow concepts, but the existence of broad concepts can not be excluded. In addition, there are also industry standard parts, such as automobile standard parts, die standard parts, etc., also belong to the generalized standard parts.
Non-standard parts processing professionals elaborated mainly that the state did not set strict standards and specifications, there is no relevant parameters, other accessories controlled by enterprises freely. There are many kinds of non-standard parts, and there is no very standardized classification at present. The general classification is as follows:
Metal non-standard parts:
Customers provide drawings, manufacturers use equipment to produce corresponding products according to drawings, usually molds, tolerance requirements, smoothness are prescribed by customers, there is no certain paradigm. From casting to finishing, products need corresponding quality control. The process is complex and changeable, and the general cost is higher than standard parts.
Non-metallic non-standard parts:
It is the processing of some non-metallic materials. For example, plastics, wood, stone and so on. In recent years, the development of plastic injection industry and plastic mould has been increasingly advanced. The introduction of surface design and programming numerical control has greatly improved the cost and tolerance level of non-standard processing.