In recent years, various companies have conducted in-depth research on the selection and management of standard parts, and have developed corresponding corporate standards to control the quality of standard fasteners. Although standard fasteners are highly standardized and specialized parts, the quality varies greatly depending on the manufacturer. In order to keep the quality of standard fasteners under control, it is necessary to establish standardized corporate standards and strengthen them. Quality control measures for standard fasteners. The factory develops enterprise standards from three aspects of specifications, technical inspection and management, and strengthens the management of fasteners commonly used in diesel locomotives. Standard fasteners There are many types of standard fasteners, and each variety has a large number of specifications. How to select the fasteners suitable for the needs of enterprises in these various varieties and specifications requires comprehensive and detailed statistical work. After statistics, the variety, specifications and frequency of use that the company has adopted will be clear at a glance. On this basis, scientific and reasonable simple work will be carried out to minimize the procurement specifications of standard fasteners on the premise of meeting production needs. And quantity, cost savings, reduced inventory, and good for production management. Now we use the fasteners 6 of our factory standard DL44001) 20005 diesel locomotive as an example to illustrate the selection of fasteners commonly used in our products. In the statistics of the standard fasteners for the pin-type fasteners, the commonly used cotter pin, taper pin, taper pin, cylindrical pin, open taper pin, elastic cylindrical pin, screw taper pin, pin eight are determined. In the statistics of the taper pin specifications, the commonly used specifications d (nominal diameter) are 6, 3, 6, 8, 10, 12, etc., and the length is between L20-L80.
Technical inspection of standard fasteners Due to the wide variety of standard fasteners, there are ten categories as described at the beginning of the article, and each type of standard fastener has many varieties; although the standard fastener structure of each type There are differences, but if the same type of standard fasteners, such as bolts and nuts, have some commonalities, some common contents of them can be made into standards, and their test methods, inspection rules, qualification judgments, and uniformity are specified. Standard fasteners are accepted into the factory to improve the quality of standard fasteners. Now we take the factory standard DL49001-965 standard fasteners into the factory inspection 6 as an example to illustrate the contents of the standard fastener technical inspection. Inspection items In the inspection items, the standard fasteners are to be inspected for surface defects, dimensions, mechanical properties and chemical composition of the materials.
Inspection procedures and inspection methods In the inspection procedures and inspection methods, the inspection methods, acceptance procedures and qualified judgments of standard fasteners are specified. For example, in the non-destructive inspection of bolts, screws and studs, if any quenching cracks on any part, wrinkles on the support surface and below are found, the batch is a non-conforming product. In the dimensional inspection of standard fasteners, the specified ratio of key fasteners is 4.4, the general fasteners are 6.2, and the code names and names of key fasteners for rolling stock products are listed in the standard appendix. ,material. When testing the mechanical properties of standard fasteners, the fasteners shall be tested for hardness according to the corresponding standards. When there is any dispute over the studs and screws in the key fasteners, the hardness value in the hardness test shall be the lowest. A sample was then tested for tensile strength. Finally, the standard also stipulates that when the supplier fails to submit a rejection of the rejected product in accordance with this standard, the arbitration inspection of the relevant items shall be carried out in accordance with the provisions of GB90-855 fastener inspection, marking and packaging. Entry inspection of standard fasteners is important. In the past, our factory's sampling of standard fasteners was simply to measure the size and appearance, while other items to be tested were not made. Many of our products were used in areas with harsh natural environmental conditions, such as wet tropics. Areas, dry and cold areas, islands, heavy salt spray areas, etc. Therefore, the quality of standard fasteners will directly affect the quality of our factory's rolling stock products, strengthen the inspection of fasteners into the factory, and strictly enforce the corporate standards, which is conducive to Improve the quality of our factory's rolling stock products.
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