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Fastener Testing Instrument
Oct 13, 2017

Fasteners are a kind of mechanical parts that are tightly connected and widely used. Fasteners, industry widely used, including energy, electronics, electrical appliances, machinery, chemical industry, metallurgy, mold, hydraulic, and so on, in all kinds of machinery, equipment, vehicles, ships, railways, Bridges, buildings, structures, tools, instruments, chemical industry, instrument and apparatus, such as the above, you can see all kinds of fasteners, is the most widely used mechanical components. It is characterized by a wide variety of specifications, different performance USES, and a high degree of standardization, serialization and generalization. As a result, some of the fasteners that already have national standards are called standard fasteners, or standard ones for short

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Fasteners are a kind of mechanical parts which are tightly connected and widely used. All kinds of fasteners can be seen in all kinds of machinery, equipment, vehicles, ships, railways, Bridges, buildings, structures, tools, instruments, instruments and supplies. It is characterized by a wide variety of specifications, different performance USES, and a high degree of standardization, serialization and generalization. Therefore, there are also some fasteners that have already established national standards as standard fasteners, or standard parts. Fasteners are the most widely used mechanical bases. China joined the WTO in 2001 and entered the ranks of international trade powers. China's fastener products are exported to countries around the world, and the fastener products from countries around the world are also constantly flooding into the Chinese market. Fasteners, as one of our country into the products of the large volume, in line with international standards, to promote China's fastener enterprises move towards the world, promote the fastener enterprises fully participate in international cooperation and competition, all have important practical significance and strategic significance. The specifications, dimensions, tolerances, weight, performance, surface conditions, marking methods, and acceptance inspection, marking and packaging of each specific fastener products are required.

Commonly used testing instrument

The most important part of the development and design of fasteners is quality control. There are several major passes from incoming materials to finished products, which have different inspection methods. The first feed is related to appearance, size, element, performance, hazardous material detection, etc. The process aspect is more appearance, size, percussion experiment, forging streamline; Heat treatment is more about appearance, hardness, torque, pull, gold, etc. Surface treatment is more of some hydrogen embrittlement test, coating, salt mist and so on, including shipment has a harmful material detection. In terms of size and appearance, the common ones are quadratic, contour measuring instrument, three-coordinate measuring instrument and image sorting machine (this is an all-selecting machine). In mechanical and chemical testing, there are mainly hardness machines (lolo and vickers), pull machine and metallographic microscope. There is a spectrum analyzer and salt mist testing machine.

Fasteners include bolts, studs, bolts, nuts, washers, and pins. Lock or killed often occurred in stainless steel, aluminum alloy and titanium alloy materials fasteners, the metal alloy is anti-corrosion performance, the surface damage, produce a thin layer of metal surface in the oxide layer to prevent further corrosion. When the stainless steel fastener is locked, the pressure and heat generated between the tooth lines can damage the oxide layer, blocking or cutting between the metal threads, and thus the phenomenon of adhesion. When this happens, the stainless steel fastener will be completely locked and can no longer be removed or locked. Usually this series of blocks, shears, slits, and locks occur in just a few seconds, so correct knowledge of such fasteners can prevent this phenomenon

1. Select product a correctly. Before using, confirm whether the mechanical properties of the product can meet the requirements of use, such as the tensile strength of the screw and the guarantee load of the nut. The length of the screw should be chosen properly, the nut 1-2 will prevail after tightening. B. Before using, check whether the thread is rough and whether there is iron or dirt between the threads, which often leads to the lock. C. It can be used to lubricate the fastener before using. It is recommended to use butter, molybdenum disulphide, mica, graphite or talcum powder to lubricate and generally use the wax treatment to lubricate the lock and lock

2. Pay attention to the use of the method a. The speed of the incoming speed should be appropriate and not too fast. Use the torque wrench or socket wrench as far as possible to avoid using the adjustable spanner or electric wrench. Too fast can cause temperature to rise rapidly and result in lock. B. The direction of the force, the nut must be straight in the axis of the screw. C. The use of gaskets can effectively prevent lock overlocking problems.





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