Non-standard turned parts

Standard parts refer to commonly used parts (parts) that have been completely standardized in terms of structure, size, drawing, marking, etc., and are produced by professional factories, such as screw parts, keys, pins, bearings. , etc. In a broad sense, it includes standardized fasteners, connecting parts, transmission parts, seals, hydraulic components, pneumatic components, bearings, springs and other mechanical parts. The narrow sense includes only standardized fasteners. Commonly known standard parts in China are short for standard fasteners, which is a limited concept, but the existence of a broad concept cannot be ruled out. In addition, there are industry standard parts, such as automobile standard parts, mold standard parts, etc., which also belong to generalized standard parts.

Non-standard spare parts are mainly other parts that the company freely controls, except that the country has not set strict standard specifications and there are no relevant parameter regulations. There are many varieties of non-standard parts and there is no very standardized classification. Approximately classified as follows:

Non-standard metal parts: The customer provides the drawing, and the manufacturer uses the equipment to produce the corresponding product according to the drawing. Generally, most molds are molds. Tolerance and smoothness requirements are specified by the customer and there is no set paradigm. The product requires corresponding quality control from casting to finishing. The process is complex and variable, and the overall cost is higher than standard parts.

Non-standard non-metallic 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 has become increasingly sophisticated, surface design and the introduction of programmed numerical control have greatly improved the cost and tolerance level of unmanufactured products. standard processing.