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Applications of fasteners
Jun 17, 2017

Fasteners are a kind of mechanical parts which are widely used for fastening and connecting. A wide variety of fasteners can be found on all kinds of machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, instruments and supplies. It is characterized by a variety of specifications, performance, use of different, and standardization, serialization, generalization of the species is also very high. As a result, some types of fasteners that are already national standards are called standard fasteners, or referred to as standard parts. Fasteners are the most widely used mechanical basic parts. With China's accession to the WTO in 2001, and entered the ranks of international trade powers. Fastener products in China have been exported to many countries and fasteners all over the world. Fasteners as China's import and export of a large amount of products with international standards, to promote Chinese fastener enterprises to the world, to promote the fastener enterprises to fully participate in international cooperation and competition, all has the important practical significance and strategic significance. Requirements for specifications, dimensions, tolerances, weights, properties, surface conditions, marking methods, and requirements for acceptance, inspection, marking and packaging of each particular fastener product.

Common inspection instruments

Fastener development and design of the most important link is quality control, from the expected delivery of finished products have several big pass, these big pass there are different ways of inspection. The first feeding related is the appearance, size, elements, performance, the detection of harmful substances and so on; the process is more appearance, size, experiment, flow line; heat treatment is more appearance, hardness, torque, tension, metallographic etc.; surface treatment is more a test, salt spray coating, hydrogen embrittlement so, including shipments have a detection of harmful substances.

In size and appearance inspection, is common in the two dimension, profilometer, three coordinate measuring instrument, image sorting machine (this is a select machine);

The main mechanical and chemical tests are hardness machine (Rockwell and Vivtorinox), tensile machine and metallographic microscope;

There is a spectrum analyzer and a salt fog test machine for material inspection.

Spare parts

It usually consists of the following 12 types of parts:

Bolt: a type of fastener consisting of two parts, head and screw (cylinder with outer thread), which must be fitted with nuts for fastening and connecting two parts with through holes. This form of connection is called bolted connection. If the nut is screwed down from the bolt, the two parts can be separated, so the bolt connection belongs to the detachable connection.

Stud: a type of fastener that has no head and is threaded only at both ends. When connecting, one end must be screwed into a part with an inner threaded hole, the other end through a part with a through hole, and then screwed on the nut, even if the two parts are fastened and connected into a whole. This type of connection is called stud connection, and it also belongs to removable connection. The utility model is mainly used for occasions where the thickness of a connecting component is large, the structure is compact, or the bolt connection is not suitable for frequent disassembly.

Screw: it is also a kind of fastener made up of two parts: head and screw. They can be divided into three kinds according to their usage: machine screw, fastening screw and special use screw. The machine is mainly used for fastening a screw thread hole and fastening parts, connection between a part with a through hole, do not need to match the nut (this connection is called screw connection, also belongs to the detachable connection; also can be matched with a nut for two with a through hole between the parts are tightly connected.) A fastening screw is used primarily to secure the relative position between two parts. Special purpose screws, such as rings, screws, etc. for lifting parts.

Nut: with internal thread hole, the shape is flat six prism, there is a flat square cylindrical or flat cylindrical, with bolts, studs or machine screws for fastening connecting two parts, make it become a whole.

5. self tapping screw: similar to machine screw, but screw thread is screw thread for special self tapping screw. For fastening two thin metal components, make it become a whole, members need to make holes, because the screw has high hardness, can be directly screwed into the member Kong Zhong, the response of the internal thread forming member

6. wood screw machine screw is similar, but the thread on the screw for wood screws with the special thread, can be directly screwed into the wooden components (or parts), used to put a hole with the metal (or metal parts) with a wooden component fastening together. This connection also belongs to removable connections.

7.: the shape of a washer type fastener oblate ring. Between the supporting surface is arranged on the bolts, screws or nuts and connecting parts surface, plays an increasing connecting parts contact surface area, reduce the pressure per unit area and protect the connected part surface is not damaged; another kind of elastic washer, also prevents the nut loosening.

8. ring: for the machine or equipment in the shaft slot or slot, play a role in preventing the shaft or hole on the left and right movement.

9. pin: mainly for parts positioning, and some can also be used for parts connection, fixed parts, transmission power or locking other fasteners.

10. rivet: a type of fastener consisting of two parts, head and nail bar, used to fasten the parts (or components) that connect the two through holes so as to form a whole. This form of connection is called rivet joint, or riveting. Generic and non removable connection. The rivets on the part must be destroyed because the two parts that are joined together are to be separated.

11. assembly and connection Deputy: assembly is a kind of combination fastener supply, such as a machine (or screw bolts, screws and washers (self) or spring washers, lock washers) combined supply; vice refers to a connecting fastener, a special bolt nut and washer combination supply

12. steel wire thread sleeve: steel wire screw sleeve is a new type of thread connecting element, which is made of high strength and high precision corrosion resistant diamond wire. Shaped like a spring mounted on the substrate specific screw hole, the inner surface of the standard threads, and screws (bolts) when combined, can significantly improve the connection strength and wear resistance; especially in aluminum, magnesium, iron, plastic and other low strength materials. The locking type is provided with a ring or a plurality of locking rings on the common type foundation. Xinxiang Yongda Industrial Co. Ltd. is a professional manufacturer of steel wire Lo sets of steel wire Lo sets, thread suggestions embedded aluminum, magnesium alloy, cast iron, glass steel, plastic and low strength of engineering materials, M, MJ thread to form a standard, with continuous strength, impact resistance and abrasion resistance, and dispersion stress protection matrix thread, greatly prolong the service life of the matrix. At the same time, improve the stress condition of the thread, forming elastic connection, eliminate the pitch and tooth type half angle error between the internal and external thread, the thread on the uniform load distribution, protect the matrix thread is not damaged, prolong the service life

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