Now machine tool processing, tool processing, manufacturing industry technology continues to improve, over the past few years, attention to this aspect of the news can be known, manufacturing industry we can say every year in the number of very high increase, but not all the parts are domestic production, want better machinery and equipment, quality is more secure, will also choose to export accessories, export accessories, parts, tools, have to admit, the effect will be better.
Mechanical spare parts processing can not appear such a problem as the existence of differences, standard tolerances are defined by national standards, used to determine the size of the tolerance zone of any tolerance. Tolerance level to determine the accuracy of the size, the national standard tolerance group is divided into 20 levels, respectively, with IT01, IT0, IT1 ~ IT18, known as the standard tolerance, IT (International Tolerance) said the standard tolerance, when the basic size is certain, the higher the tolerance level, the smaller the standard tolerance value, the higher the accuracy of the size. The standard tolerance of holes and shafts with the same basic size and tolerance level are equal. For the convenience of use, the national standard of ≤ 500 basic size range is divided into 13 size segments
Product standardization itself includes the meaning of three aspects:
(1) the serialization of product varieties and specifications - the main parameters of the same type of product, type, size, basic structure, etc., in order to grade, made into a series of products, with fewer varieties of specifications to meet the needs of a wide range of users;
(2) the generalization of parts and components -- will be the same type or different types of products in the use of similar structure parts (such as bolts, bearing housing, couplings and reducers, etc.), after the unification to achieve universal interchangeability;
(3) product quality standardization -- product quality is the all enterprises " product quality standardization - product quality is the lifeline of all enterprises, to ensure qualified and stable product quality must do a good job in the design, processing technology, assembly inspection, and even packaging, storage and transportation and other aspects of standardization. In this way, we can be invincible in the fierce market competition.
