A spring is a mechanical part that works with elasticity. Parts made of elastic material under the action of external deformation, remove the external force and then restore the original state. Also for "spring". Generally made of spring steel. The type of spring complex and diverse, according to the shape points, mainly coil spring, scroll spring, leaf spring, shaped spring and so on.
For the spring industry, the long-term formation of a low-grade ordinary spring oversupply, high-end products (high strength, high stress, heterosexual parts, special materials) in short supply of passive situation. China's spring industry has been saturated production, according to expert statistics, China's annual production of spring has reached 4 billion, all kinds of spring products a total of 21 categories, more than 1,600 varieties, mainly valve spring, suspension spring, diaphragm spring Spring springs, hydraulic springs, oil pump springs, disc springs, high temperature springs, retaining springs, tension springs, torsion springs, compression springs, scroll springs and heterosexual springs. Spring industry in the "eight five", "Ninth Five-Year" period is relatively fast development, especially in Shanghai, Tianjin, Guangzhou, Shandong, Changchun, Chongqing and other regions developed rapidly, other regions have different degrees of development, Better than any other industry. Cars, motorcycles, motor vehicles, internal combustion engines, electrical, equipment, but also the development of these industries will lead to the development of the spring industry. In the face of the macroeconomic situation, the long-term accumulation of products formed by the industry is low, the organizational structure is loose, and the weak development capability is further highlighted. From the deep-seated excavation, mainly the market, the system and the mechanism of the industry. Inspectors believe that with the national The economy from the seller's market to the buyer's market changes, some deep-seated contradictions, especially over the years accumulated structural contradictions become increasingly prominent. The current industrial structure is unreasonable: the production capacity of some industries, product structure is irrational; technical structure is irrational, the level of major industrial equipment is low; small size of the organization, the lack of competitive strength and advantages of regional structure convergence, failed to reflect Comparative advantage and synergies.
According to the nature of the force, the spring can be divided into tension spring, compression spring, torsion spring and bending spring, according to the shape can be divided into a disc spring, ring spring, plate spring, coil spring, cut cone scroll spring and torsion spring , According to the production process can be divided into cold spring and hot coil spring. Ordinary cylindrical spring as a result of simple manufacturing, and can be made according to the load of various types, simple structure, so the most widely used. Spring manufacturing materials in general should have a high elastic limit, fatigue limit, impact toughness and good heat treatment performance, commonly used carbon spring steel, alloy spring steel, stainless steel spring and copper alloy, nickel alloy and rubber Wait. Spring manufacturing methods are cold roll and hot roll method. The diameter of the spring wire is less than 8 mm in general with a cold roll method, greater than 8 mm using a hot roll method. Some springs in the made after the pressure or shot peening, can improve the carrying capacity of the spring.
Note the problem
Due to product structure constraints, multi-strand spring generally has high strength, good performance characteristics. Requiring the material in the spring strength and toughness on the final performance to be guaranteed. Multi-strand spring in the processing process, should be noted that: 1, the support ring according to product requirements can choose cold and heat and two methods. The use of heat and the way does not allow the spring to sparks or whitening, silicon manganese steel temperature shall not be higher than 850 ℃. The support ring and the effective ring should be in effective contact, the gap shall not exceed 10% of the gap between the circle. 2, multi-strand spring characteristics can be determined by the adjustment lead, winding system can be adjusted when the cable distance. Twist pitch from 3 to 14 times the wire diameter, but generally take 8 to 13 times better. The spring force and free height, and end ring, diameter and wire performance are closely related, by adjusting one or several of them to be changed. 3, without supporting the ring of the spring and wire diameter too thin spring should not be welded head, but the end of the cable should not be obvious loose, should be burr. Where the need to weld the head of the multi-strand spring, the welding site length should be less than 3 times the cable diameter (up to no more than 10 mm). Heating length should be less than one turn, after welding should be smooth grinding, welding parts should be local welding low temperature annealing. 4, spring surface treatment can be carried out in general phosphating can also be other treatment. Where to be coated with zinc and cadmium, after plating should be carried out in addition to hydrogen treatment, in addition to hydrogen after pumping 3% (not less than 3) re-test set treatment, re-test may not have broken. Spring should remove the surface dirt, salt marks, scale, the method can be used to blow sand or gasoline cleaning method, but can not use pickling. 5, the important spring tightening time of 24 hours, ordinary spring for 6 hours or continuous compression 3 to 5 times, each time to maintain 3 to 5 seconds. When the pressure between the spring and the mandrel to the mandrel diameter of 10% is appropriate, the gap is too small is difficult to operate, the gap is too large to make the spring bending deformation. If one of the springs is broken when pressed, the rest should be reprocessed.