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Application of fasteners and common testing instruments

2020-11-23

The general term for a class of mechanical parts used when two or more parts (or components) are fastened and connected into a whole.
application
Fasteners are a type of mechanical parts that are used for fastening connections and are extremely widely used. All kinds of fasteners can be seen on various machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, meters and supplies. It is characterized by a wide variety of specifications, different performance and uses, and a high degree of standardization, serialization, and generalization. Therefore, some people call a type of fasteners that have national standards as standard fasteners, or simply standard parts. Fasteners are the most widely used mechanical basic parts. With my country's accession to the WTO in 2001, it has entered the ranks of major international trading nations. my country's fastener products are exported in large quantities to countries around the world, and fastener products from all over the world are also pouring into the Chinese market. Fasteners, as one of the products with a large import and export volume in my country, are in line with international standards. It is of great practical significance to promote Chinese fastener companies to the world and to promote fastener companies to fully participate in international cooperation and competition. Strategic significance. Due to the specifications, dimensions, tolerances, weight, performance, surface conditions, marking methods of each specific fastener product, as well as the specific requirements for acceptance inspection, marking and packaging items
Common testing equipment
The most important link in the development and design of fasteners is quality control. There are several major barriers from input to finished product shipment. These major barriers have different inspection methods. First of all, the input materials are related to appearance, size, element, performance, hazardous substance detection, etc.; process aspects are more appearance, size, percussion experiment, forging flow line; heat treatment is more appearance, hardness, torque, tension , Metallography, etc.; surface treatment is more of some hydrogen embrittlement tests, coatings, salt spray, etc., including a hazardous substance test shipped. In terms of size and appearance inspection, the common ones are the two-dimensional, contour measuring instrument, three-coordinate measuring instrument, and image sorting machine (this is a full-selection machine); in mechanical and chemical inspection, there are mainly hardness machines (Rockwell and Vickers ), tensile tester, metallographic microscope; for material inspection, there is a spectrum analyzer and salt spray tester.

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