Method for making highly loaded compression springs

FIELD: manufacture of helical compression springs operating at impingement of their turns in condition of elevated temperatures.

SUBSTANCE: after coiling spring with pitch more than that of ready spring, the last is subjected to heat treatment and shot-blast hardening. After thermal compression and scragging spring or simultaneously with said operations, turns of spring are subjected to plastic strengthening. In order to realize it, spring is compressed by action of load consisting of 10 - 300 F3 where F3 - spring force at maximum deformation.

EFFECT: possibility for making springs with improved dynamic strength and with accurate stable in time elastic characteristics.

4 cl

 

The invention relates to a technology of manufacturing a helical compression spring, including hardened or ground to the winding of the wire, working with collisions turns at higher temperatures.

A known method of manufacturing the suspension springs of the vehicle with a favorable distribution of residual stresses in the cross section of a coil, the resulting plastic precipitation by Saavalainen compression force maximum deformation F3on 6÷48 hours, and blast work hardening [1]. This method increases the service life and increases the strength of the spring, but it is applicable only for the manufacture of springs with a large cross-sectional diameter of a coil - spring suspension with a diameter of d≥12 mm, as with the effect of work hardening on the relaxation of the load slightly. And in the manufacture by this method springs with a small diameter coil, such as valve springs with diameter d=3.6 mm, hardening to a large extent influence the relaxation of the load and there is a significant dispersion of the length of the spring, i.e. its power settings. Therefore, this method is not suitable for the manufacture of springs, working with collisions turns at higher temperatures.

Not suitable and method of manufacture [2] spring suspensions VAZ - wrapped, heat treatment, shot blasting, cold precipitate three times to accoutrement compression, the protective coating is in the operation of the vehicle collision occurs coils and because of the resulting contact reaction spring loses altitude and power settings.

A known method of manufacturing a high-loaded compression spring, which includes the winding of the spring, heat treatment, polishing the ends of the blast hardening, thermocalc and three cold draught, characterized in that thermocalc is carried out at a temperature of 200÷250°C [3]. The method is as follows. On spring-coiling machine serves hardened to the winding wire and wound the spring with a step above the step, ready to spring. Then in a furnace to produce a vacation at a temperature of 410°C. Further, the heat-treated springs grind the ends. After 100% of romcontrol and washing carried out the blast hardening on the shot-blasting plant cell-type and subsequent thermocalc force maximum deformation F3at a temperature of 240°in a special oven. Then, after washing three precipitation remove facets on the two ends of the spring in accordance with the requirements of the drawing. The last operation - phosphate, preservation and packaging. When the sequence of technological operations the value of the relaxation load senegalian for 48 hours at a temperature of 130°C is 2÷4%.

However, this method has drawbacks. He h is suitable for springs, working in dynamic mode with collisions of the coils due to the formation of contact reactions in coils, leading to premature upsetting springs and the loss of geometric and strength parameters. Moreover, the grinding of coils and chamfer on the ends of the springs after heat treatment violates created by heat treatment of the structure of the material of the springs, which reduces their quality - these operations should be carried out prior to the heat treatment. And the so-called triple sediment springs - short-term maximum compression force deformation of F3[4] is commonly used to test for the presence of cracks and the quality of performance of previous operations: largest occurred while modifying the height of the spring is supposed to judge the quality of the process. But because of lack of time for stabilization of precipitation this method does not give a complete picture of the quality of the spring.

Therefore, this method does not guarantee an acceptable quality of springs working with collisions turns at higher temperatures.

However, the presence of certain operations and their execution order allows you to take it as a prototype.

The technical result, which is aimed invention is to provide a method allowing to make springs high dynamic strength, precision is stable in time elastic characteristics when working with collisions turns at higher temperatures.

The technical result is achieved due to the new operations of the technological process and their new sequence, namely, the invention consists in that in the method of manufacturing a high-loaded compression spring comprising a winding spring increments exceeding the ready springs, heat treatment and shot blasting work hardening, characterized in that exercise thermocalc or senegalian springs, after or simultaneously with termousadki produce plastic hardening it turns by compressing the spring load component 10÷300 F3where F3- spring force at maximum deformation. Plastic hardening coils of the spring is carried out by application thereto of the initial load, providing the minimum permissible draught, and the subsequent application of repeated loads, increased in proportion to the ratio of the desired precipitation to precipitate from the application of the initial load. When this load to compress the spring when the plastic hardening can be applied vibration. With increased requirements for power settings springs after winding produce editing and polishing the ends with the removal of chamfers on them.

As the initial load when the plastic hardening of the coils of the spring, and the magnitude of the step when wrapped under the padding of the world who are sufficiently illuminated [5] in the literature, and not cause problems.

When the sequence of technological operations produce technological draught of spring, the largest superior draught of spring in the product, which formed a favorable stress state on the surface and inside of the coils of the spring which counteracts the occurrence of precipitation during the spring. Use the double load [6], which reduces the variation of the power parameters of the springs in relation to the set standards by 1/3. Make load vibration, which ensures uniform distribution over the cross section of the coils of the spring [7]. This enhances the resistance of the springs when working in the product and the accuracy of its manufacturing on the length and load, reduced waste sorting springs, decreases the magnitude of the relaxation load tests Saavalainen for 48 hours at a temperature of 130°With up to 2.5%. Because plastic hardening coils load 10÷300 F3occurs within a fraction of a second [5], the duration of operation of the plastic hardening is ˜1÷5 that reduces production cycle springs.

The method is as follows. On spring-coiling machine serves hardened or polished before winding wire wound spring with a step above the step, ready to spring. Produce tarmoola otcu springs. After 100% of romcontrol and washing carried out the blast hardening. After thermocalc or samevolume produce plastic hardening coils to achieve the desired height of its spring compression load 10÷300 F3and thermocalc and plastic hardening coils can be carried out simultaneously. Then measure the parameters of the spring. The last operation of a protective coating, preservation and packaging. In the manufacture of precise power settings springs after winding their rule and grind the ends with the removal of chamfers on them.

Sources of information

1. Patent EP 0645462 A1, CL 21 D 9/02, 29.03.95.

2. Semakov VLADIMIR variety of models spring suspensions VAZ, their manufacture, operation and interchangeability // driving, 1998, No. 5, s-245.

3. Patent RU 2208056 21 D 9/02, 08.02.2001.

4. GOST 13765-86. Springs cylindrical helical compression and tension steel of circular cross section. M: Gosstandart, 1986.

5. Zemljanushnov POSTGRADUATE, Tabanco, Y.M. improving the quality of the springs. Stavropol: Sevkat, 2001, 93 S.

6. USSR author's certificate 554915, M CL 21 f 35/00, 1975.

7. USSR author's certificate 580474, M CL G 01 M 13/00, 21 f 35/00, 1976.

1. A method of manufacturing a high-loaded compression spring comprising a winding spring increments exceeding the ready springs, heat treated springs and blast hardening, Otley is audica fact, what does thermocalc or senegalian spring, after or simultaneously produce plastic hardening it turns by compressing the spring load component 10-300 F3where F3- spring force at maximum warp.

2. The method according to claim 1, characterized in that the plastic hardening of the coils of the spring is carried out by application thereto of the initial load, providing the minimum permissible draught, and the subsequent application of repeated loads, increased in proportion to the ratio of the desired precipitation to precipitate from the application of the initial load.

3. The method according to claim 1 or 2, characterized in that the load to compress the spring when the plastic hardening is applied vibration.

4. The method according to claim 1 or 2, characterized in that after the winding produce the edit springs and polishing it ends with the removal of chamfers on them.



 

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