In the statistics of the taper pin specifications, the commonly used specifications d (nominal diameter) are three, three, four, five, six, eight, eight, and the like, and the length is between 16 and 100 mm. This statistical result was fully considered when setting standards, which reduced the procurement specifications and quantity of standard parts, saved costs, reduced inventory, and facilitated production management. At the same time, the standard method also specifies the marking method of the standard parts on the drawings and technical documents, which is conducive to the standardization and standardization of the drawings and technical documents, and also facilitates the unification of technical management. The standard has strong pertinence and operability. 2 Standard parts technical standards Because there are many types of standard parts, there are ten categories as mentioned at the beginning of the article, and each type of standard parts has many varieties; although each type The standard parts are different in structure, but if they are the same type of standard parts, such as bolts and nuts, there are some commonalities. Some common contents can be formulated into technical specifications, specifying their technical requirements, test methods, Inspection rules, qualification judgment and packaging, transportation, storage and signs, etc., to standardize the acceptance of standard parts, improve the quality of standard parts. Technical requirements In the "Technical Requirements", the requirements for the material of the bolt, the accuracy level of the thread, the surface requirements, the performance and grade, the tolerance level, the surface treatment, and the surface defects are specified. For example, in the "surface requirements" we specify that the surface of the thread is not allowed to have cracks and bumps and burrs that prevent the thread gauge from being freely screwed in, and that the double cusps, dents and buckles that do not affect the use are not allowed to be incomplete; Surface requirements are not allowed to affect the use of dents, burrs, rust, round blunt, flash, burns and scale; the basic requirements for the head of the bolt and the screw to the head must be followed. Technical requirements are the basic requirements for the product and are the norms that must be followed. Test method In the "test method", the hardness test and the tensile test method of the bolt are specified, and the mechanical property value to be achieved, the test instrument, the matters to be noted, and the arbitration test are specified. In the "inspection rules", the inspection rules specify the items to be inspected, the inspection methods, the acceptance procedures, and the qualifications. For example, for routine inspection items such as appearance, size, thread, etc., it is required to conduct random inspection for each batch of supply, and 5 samples are taken from the same specification each time. If one is unqualified, then 5 pieces are taken, and 2 pieces are accumulated. (including 2) If the above does not meet the requirements, it will be judged as unqualified, otherwise it will be judged as qualified; for items requiring regular inspection, such as mechanical properties, coating thickness, chemical composition, etc., it is required to conduct at least one inspection, acceptance procedure and routine every year. Check the same. The management of standard parts management standard parts involves various functional departments of the enterprise, such as supply, design, process, inspection, etc. How to organically integrate the work related to standard parts of these departments to make them better for production It is necessary to develop a standard piece of enterprise management standards. Locks Accessories,Rod Control Locks,Window Seals,Sponge Rubber Tapes Ningbo Hengchieh Locking Technology Co., Ltd. , http://www.hengchieh.com