Compression spring producing method

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

SUBSTANCE: after coiling spring with pitch exceeding pitch of ready spring, the last is subjected to heat treatment and shot-blast hardening. Then spring is compressed by action of axial load consisting of 10 - 300 F3 where F3 - spring force at maximum deformation. It is possible to perform secondary compression of spring by action of load increased in proportion to relation of target camber to camber value caused by first load. Spring may be subjected to action of vibration loads. In order to satisfy high demands made to force parameters of spring the last is dressed after twisting and ends of spring are ground and chamfered.

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

4 cl

 

The invention relates to a method of manufacturing helical compression spring, working with collisions of turns of the usual, hardened or polished prior to coiling wire. Can be used in the manufacture of springs, working both at normal and at high 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, which is produced by the spring compression force maximum deformation F36-÷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 (coil spring diameter d≥12 mm), as the effect of work hardening on the relaxation of the load slightly. In addition, this method is not suitable for the manufacture of springs, working with collisions of turns: during operation of the vehicle will be collision orbits and for the associated contact reactions spring loses altitude and power settings.

For the same reason, unfit and method of manufacture [2] spring suspensions VAZ: wrapped, heat treatment, shot blasting, cold sludge triple compression, application of protective coatings. COI is lizama this cold draught briefly three spring compression force maximum deformation F 3typically used to correct uneven step of coils springs and some stabilization, including testing for the presence of cracks and the quality of performance of previous operations. Largest occurred while modifying the height of the springs are supposed to judge the quality of the process. But because of lack of time to stabilize precipitation - recommended 6÷48 hours - this method does not guarantee the stability of the suspension springs, and does not give a complete picture of the quality of the springs.

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 about the Ki and 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. It is not suitable for springs operating 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 because insufficient time to stabilize precipitation does not guarantee the quality of the spring. Therefore, this method, as mentioned above, is not acceptable for springs, working with collisions turns. 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 develop a process that can improve the quality of manufacturing springs, accurate and stable over time elastic characteristics when the springs with the collisions of the coils.

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 compression spring, which includes the winding of the spring increments exceeding the ready springs, heat treatment, shot blasting work hardening, characterized in that after blast of cold work hardening perform an operation of pressing the spring axial load of 10÷300 F3where F3- spring force at maximum deformation, and re-pressing, load, increased in proportion to the ratio of the desired precipitation to precipitate from the app first loads. When this load can be vibrating. When the desired height of the spring re-pressing is not required. With increased requirements for power settings springs after winding produce editing and polishing the ends with the removal of chamfers on them.

Thanks to the operation of pressing is the plastic hardening design: creates a favorable stress state on the surface and inside of the coils of the spring which counteracts the occurrence of precipitation in the spring, and using the method of proportional loading [4] provides precision springs in height and load. Time of application of the load - seconds or fractions of a second. For more than the uniform load distribution over the cross section of the coils of the spring it makes vibration [5].

The determination of the allowance for a draught of spring and the load is known and described in the literature: allowance must be greater than the amount of the allowance under the draught of the above technologies and precipitation during the spring in the product is approximately 1.5 allowance under normal senegalian, and be qualified by testing springs [6].

In the implementation of the proposed method the resistance of the spring increases 1.5÷2 times relatively springs, manufactured using the above methods.

The method is as follows. On spring-coiling machine serves regular, hardened or polished before winding wire wound spring with a step above the step, ready to spring. Produce heat treatment of springs - quenched and tempered, and carry out the blast hardening. After blasting work hardening perform an operation of pressing the spring axial load within 10÷300 F3and re-load, increased in proportion to the ratio of the desired precipitation to precipitate from the app first loads. Then the protective coating and the measurements of parameters of the spring, preservation and packaging. In the manufacture of highly accurate power settings springs after winding their rule and grind the ends with the removal of chamfers on them.

Note: under the heat treatment of the spring assumes its hardening with subsequent tempering in with the accordance with the modes, accepted for a certain brand of spring steels [7].

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 // Behind the wheel. 1998. No. 5, s-245.

3. Patent RU 2208056 C2, C 21 D 9/02, 08.02.2001.

4. A.S. USSR 554915, MCL 21 F 35/00, 10.07.75.

5. A.S. USSR 580474, MCL G 01 M 13/00, 21 F 35/00, 1976.

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

7. Ruhstadt A.G. spring steel and alloys. M.: metallurgy, 1982, 400 S.

1. A method of manufacturing a compression spring, which includes the winding of the spring increments exceeding the ready springs, heat treatment, shot blasting work hardening, characterized in that to achieve the resistance of the spring and reduce altitude deviations after blast of cold work hardening perform an operation of pressing the spring axial load in the range 10-300 F3where F3- spring force at maximum warp.

2. The method according to claim 1, characterized in that the spring makes a re-load, 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 exerting vibration.

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



 

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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.

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