Nowadays, in the metal industry, due to the continuous expansion of mechanical equipment, the demand for screws and nuts in the past few years is increasing. In 2019, the production of such non-standard parts is even more numerous. It is the development trend in the market.
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 commonly used parts, such as threaded parts, rolling bearings, etc., which are fully standardized in terms of structure, size, drawing, marking, etc., and are produced by professional factories.
Generalized includes standardized fasteners, joints, transmissions, seals, hydraulic components, pneumatic components, bearings, springs and other mechanical parts.
In the narrow sense, only standardized fasteners are included. The standard part in China is the abbreviation of standard fasteners, which is a narrow concept, but cannot exclude the existence of general concepts. In addition, there are also industry standard parts, such as automotive standard parts, mold standard parts, etc., which are also generalized standard parts.
The non-standard parts processing professionals explained that the country has not set strict standard specifications, and there are no other parameters that are freely controlled by the enterprise. There are many varieties of non-standard parts, and there is currently no very standardized classification. The general classification is as follows:
Metal non-standard parts:
The drawings are provided by the customer, and the manufacturer uses the equipment to produce the corresponding products according to the drawings. Usually, the molds are mostly, the tolerance requirements, and the finish are all specified by the customer, and there is no certain paradigm. The product requires complete quality control from casting to finishing, the process is complex and variability, and the general cost is higher than the standard parts.
Non-metallic non-standard parts:
It is the processing of some non-metallic materials. Such as plastics, wood, stone, etc. In recent years, the injection molding industry, the development of plastic molds has been increasingly refined, surface design, programming CNC reference, so that the cost and tolerance level of non-standard parts processing has been greatly improved.
