Method for manufacture of compression springs

FIELD: technological processes.

SUBSTANCE: method includes coiling of spring from polished or patented wire with pitch that exceeds pitch of finished spring, thermal treatment, shotcasting riveting and spring pressing by means of its yield by axial load of (10÷300) F3 value, where F3 is spring force at maximum deformation. At that high-temperature thermomechanical treatment of wire is carried out prior to spring coiling.

EFFECT: spring operational properties are improved.

5 cl

 

The invention relates to a technology for manufacturing a helical compression spring operating in normal mode or with the impact of coils, patented or sanded 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 compression springs, in U.S. Pat. RU # 2275270 S1, which includes the winding of the spring increments exceeding the ready springs, heat treatment, shot blasting work hardening, after blasting work hardening perform an operation of pressing the spring axial load (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 [5]. When this load can be vibration [6]. 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.

But when the springs are under high temperatures, there is sludge and loss of performance properties. Therefore, before the operation of winding the spring wire should be subjected to a high temperature (vtmo) thermomechanical processing [1], which is based on the combination of operations hot processing of metals by pressure rolling, drawing, bending or wrapped at small radii) followed by immediate quenching with regulated temperature and time settings. After WTO provides increased strength, increased fatigue strength (including low-cycle), as well as fracture resistance, ductility and impact strength, temperature decreases hladolomkosti, virtually eliminating reversible temper embrittlement and reduced hydrogen embrittlement. In addition, the material of the wire may be subjected once or twice, the electroslag remelting, which reduces the size of nonmetallic inclusions and increases stamina springs. In the manufacture of wire to remove the defects of the outer surface can be applied to the turning of the cutting head, grinding, polishing.

The proposed technological process of manufacturing of compression springs out of the ordinary, sanded or patented wire comprising the winding of the spring increments exceeding the ready springs, heat treatment and shot blasting work hardening, pressing spring axial load component (10÷30)F3where F3- spring force at maximum deformation, characterized in that before the winding of the spring make the process of high-temperature thermomechanical processing of wire and, if necessary, leave. When Tanavoli the years of the first spring exerting a load, providing the minimum allowable draught when working in the product, and then make a re-load, increased in proportion to the ratio of the desired precipitation to precipitate from the application of the initial load [5]. When this load can be applied vibration [6]. 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 refacing is known and sufficiently lit [3, 4] in the literature and do not cause difficulties.

The method is as follows. Polished or patented wire is subjected to WTO and, if necessary, leave, then the wire serves to spring-coiling machine or machine and wound the spring with a step above the step, ready to spring. Produce heat treatment of springs. After 100% of romcontrol and washing carried out the blast hardening. After producing the pressing springs to achieve the desired height of its spring compression load (10÷300)F3. 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 a shot who eat them chamfers.

Note. Methods of high-temperature thermomechanical hardening varied and are presented in the following patents.

1. A.S. 528989 the USSR, IPC B21F 3/04. A method of manufacturing springs. / I. Shavrin, Redkin L.M., Kreknin LT No. 2100900/02; Appl. 31.01.75; publ. 25.09.76. Bull. No. 35. - 2 C.

2. A.S. 882687 the USSR, IPC B21F 3/04, B21F 35/00, C21D 9/02. A method of manufacturing springs. / I. Shavrin, Redkin L.M., Konyshev V.N., Kotel'nikov A.V., Yakovlev UT, Grigoriev VK - No. 2782490/25-12; claimed 19.06.79; publ. 23.11.81. Bull. No. 43. - 2 C.

3. A.S. 1234018 SU, IPC B21F 35/00. Method of manufacturing large springs. / I. Shavrin, Redkin L.M., Shcherbakov V., Maslov LN, Konyshev NR. No. 3781269/25-12; claimed 13.08.84; publ. 30.05.86. Bull. No. 20. - 2 C.

4. A.S. 1509161 SU, IPC B21F 3/04. A method of manufacturing springs. / Redkin L.M., Konyshev V.N., Fry A.A., Kotel'nikov A.V. No. 4341421/31-12; claimed 10.12.87; publ. 23.09.89. Bull. No. 35. - 2 C.

In the testing of integrated technology spring making industry developed technical specifications for the supply of reinforced thermo wire from steel SA - TU AI 347-82 (INIT); steel HF and SA - TU AI B3-350-88 (INIT) and THE VZ-350-88 (IZHSTAL) [4].

Consider in detail the method according to A.S. 1509161 SU. Wire of alloy steel is subjected to high-temperature thermomechanical treatment by drawing on a special installation, and after vtmo give the average vacation. Next, the wire is t cold plastic deformation by drawing with the degree of deformation 15...50% (for a section of about 2 mm - 50%, more than 5 mm - 15%). Cold coiling machines or flexible manufacture springs with subsequent tempering at a temperature not exceeding the temperature tempering hardened wire.

The application of cold plastic deformation with degree less than 15% leads to uneven hardened state in the cross section of the wire, leading mainly to the hardening of the surface layers of metal. Subsequent cold deformation during winding operations, samevolume will neutralize the effect of the preliminary hardening. Deformation with degree more than 50% starts to build in reinforced thermo material wire pockets of local strain, which lead to the appearance of fatigue cracks and thus to a premature failure of the springs.

The method was tested in the manufacture of springs, injector of diesel engine wire HF - utmo ⊘ 2.6 mm, the number of working turns of 6.5, the total number of turns of 8.5, height 26 mm, the outer diameter of 11.8 mm as the material for the study used the wire from steel HF 3.5 mm after WTO by drawing on a special installation, electrohouse on the hardness HRC42-48 at a temperature of 350-400°With this same setup and cold plastic deformation by drawing on the mill 1/550 up to a diameter of 2.6 mm After winding the springs were released at 320±10°during the 1 o'clock

Experienced spring experience fatigue stand. The comparison is made with endurance serial springs and spring wire HF-vtmo (without hardening). Studies have shown that endurance experienced springs made of steel HF - vtmo with additional cold plastic deformation of the wire above the endurance of the control springs 1.8-2.5 times. Thus, the proposed method provides improved performance springs.

But not in the working conditions of the spring with the power contact or collision orbits.

Sources of information

1. Ruhstadt A.G. spring steel and alloys. / M: metallurgy, 1982.

2. Patent RU No. 2275270 C1 IPC B21F 35/04, C21D 9/02, 2006.

3. Tabanco, Y.M. problems of high-speed production of springs and their solutions. The monograph. - Stavropol: OOO "the World of data", 2007, 152 S.

4. Zemljanushnov POSTGRADUATE Calculation of helical compression springs at the contact senegalian. The monograph. - Stavropol: "Agrus", 2008, 136 S.

5. USSR author's certificate 554915, MCL B21F 35/00, 1975.

6. USSR author's certificate 580474, MCL G01M 13/00, B21F 35/00, 1976.

1. A method of manufacturing compression springs, sanded or patented wire comprising the winding of the spring increments exceeding the ready springs, heat treatment, shot blasting work hardening and the pressing spring by precipitation OS is howling load value (10÷ 300)F3where F3- spring force at maximum deformation, characterized in that before the winding of the spring produce high-temperature thermomechanical processing of wire.

2. The method according to claim 1, characterized in that the pressing make 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 applied by the 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.

5. The method according to claim 1, characterized in that make a vacation of a wire held by high-temperature thermomechanical processing.



 

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FIELD: technological processes.

SUBSTANCE: method includes coiling of spring from polished or strengthened wire with pitch that exceeds pitch of finished spring, thermal treatment, shotcasting riveting, thermosetting or hardening. Afterwards or simultaneously with thermosetting, spring plastic strengthening is carried out by its compression by axial load, which makes (10÷300)F3, where F3 is spring force at its maximum deformation. Prior to spring coiling, high-temperature or low-temperature thermomechanical strengthening of wire is carried out, and spring compression by axial load is done in process of its heating up to tempering or quenching temperature.

EFFECT: improved operational properties of spring.

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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.

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FIELD: manufacture of jewelry articles, possibly manufacture of gold-alloy small springs of locks of snap hooks in jewelry industry.

SUBSTANCE: method comprises steps of winding from wire prepared by deforming alloy at several stage with intermediate annealing between said stages small spring; at last stage deforming alloy by drawing at total reduction degree exceeding 85% but less than 95%. Preferably drawing of wire is started from initial diameter of wire din = 1mm till final diameter df = 0.35 mm for 13 passes at total reduction degree 87.3%. Spring is made of gold alloy with purity 385.

EFFECT: enhanced elastic properties of spring, improved manufacturing process for realizing the method.

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FIELD: manufacturing and testing of spring, possible usage in industrial branches, manufacturing and using springs: mechanical engineering, aviation engineering, automobile engineering, tool-making industry, etc.

SUBSTANCE: device for contact predeformation of springs contains lower immobile plate and lower moving plate, mounted on which with possible re-mounting along outer diameter of spring are guiding supports for same. Spring is positioned between lower and upper inserts, on end surfaces of which screw surfaces are made, repeating profile of edge coils of spring. Inserts have stops, lower insert being positioned on lower moving plate between re-mountable guiding supports, and spring being mounted so that it is in contact by edge coils with screw surfaces of inserts and abuts by end of edge coils against stops of inserts. Upper insert is made with ball surface, interacting with ball surface of puncheon, held on lower immobile plate are guiding bars and stops, limiting edge positions of lower moving plate, which is provided with mechanism for its movement into working zone under the puncheon and backwards.

EFFECT: increased labor productivity during predeformation of springs and during adjustment of device for predeformation of springs with different sizes.

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FIELD: technological processes.

SUBSTANCE: bar is heated up to the temperature that provides homogenisation of steel high-temperature phase. Then spring is wound from bar at its heating temperature. At that spring is subjected to turn-by-turn tempering. Tempering of every turn is carried out after its winding and after-winding ageing in time sufficient for steel polygonisation for complication of recrystallisation rearranging of its structure. Final thermal treatment of spring is carried out by means of its tempering.

EFFECT: higher strength and operational durability of produced spring.

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