Compression springs

Springs of compression carry out the main function (compression) under the influence of loadings. As in operating time their length decreases, in not loaded state rounds of springs should not adjoin. The main standard by which are guided at production of springs, - GOST 16118-70. It is possible to find the declared groups of accuracy of springs which is around three in it.

The main distinctions are deformations and loadings. On the other hand, production of springs with uncontrollable parameters of loading is not forbidden, so - is quite admissible. In the parallel planes which are perpendicular the forming spring there have to be rounds of the springs working for compression, which are called basic rounds. For this purpose the long spring is put on a mandrel that also provides reliable fixing. The basic round, as well as in former cases, is drawn in to those that are as it is possible closer from it. The end face gives in to careful polishing. End faces can be ground too, however it becomes only at the request of the customer

GOST 9389-75 describes production of springs of compression by method of a cold navivka. According to the document, future product in this case is exposed only to low-temperature holiday. Training is necessary only to those springs as which material chose brand of steel for which high-temperature processing is provided. At production of a product also repeated process of training is allowed, however it can be carried out only once, otherwise the spring will lose the functional qualities.

Distinctive feature of all springs of this look is the long distance between rounds that the name "spring step" also carries. Naturally, this distance has no constant number, and changes depending on extent of deformation of a product under the influence of external loadings. The extreme, a little drawn in rounds of springs have the special surface processed so that efforts are evenly distributed on a spring axis. It is accepted to call this surface a tortsovka.

Technological process of production of the springs working for compression difficult also has several stages. Also state standards regulate such methods of work on future product:

• Cold navivka. At the same time diameter of a wire undertakes from 0,1 mm, but no more than 10 mm. Process happens on special machines or on pruzhinonavivochny automatic machines;
• Hot navivka. Then diameter of a bar will make no more than 50 mm, and minimum - 10 mm.

The main material serving for production of springs of compression has to maintain works at a temperature up to 120 degrees Celsius. Most often use: 1) a cold-drawn wire, according to GOST 9389-75; 2) the spring and spring alloyed and carbonaceous steel in accordance with GOST 14959-79 (14963-78). The last has several subspecies: 55C2; 60C2A; 60C2XA; 60S2HFA.

Excellent characteristics for production of springs have all four appearance.