Fastener application

Fasteners are a class of mechanical parts that are used for fastening connections and are extremely versatile. A wide variety of fasteners can be found on a variety of machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, meters and supplies. It is characterized by a wide variety of specifications, different performance uses, and the degree of standardization, serialization, and generalization is also extremely high. Therefore, some types of fasteners with existing national standards are also referred to as standard fasteners, or simply as standard parts. Fasteners are the most widely used mechanical foundation. As China joined the WTO in 2001 and entered the ranks of international trade powers. China's fastener products are exported to the world, and fastener products from all over the world are also pouring into the Chinese market. As one of China's large import and export products, fasteners are in line with international standards, and it is of great practical significance to promote the Chinese fastener enterprises to the world and promote the full participation of fastener enterprises in international cooperation and competition. Strategic significance. Due to the specifications, dimensions, tolerances, weights, performance, surface conditions, marking methods, and specific requirements for acceptance inspection, marking, and packaging for each specific fastener product.

Common testing equipment

The most important part of the development and design of fasteners is quality control. There are several major barriers from feeding to finished product shipment. These major barriers have different inspection methods. Firstly, the related materials are related to appearance, size, element, performance, detection of harmful substances, etc.; the process is more about appearance, size, tapping experiment, forging line; heat treatment is more appearance, hardness, torque, tension Metallographic and so on; surface treatment is more hydrogen embrittlement test, coating, salt spray, etc., including shipment of a hazardous substance test. In the size and appearance detection, common is the secondary element, profile measuring instrument, coordinate measuring machine, image sorting machine (this is a full selection machine); mechanical and chemical testing, mainly hardness machine (Lotus and Vickers) ), tensile machine, metallographic microscope; material testing, there is a spectrum analyzer, salt spray test machine.