Method for production of multi-cored helical springs

FIELD: technological processes.

SUBSTANCE: method includes cable twisting and its coiling onto holder with simultaneous kinking and stretching of wire at the same operation, cutting of spring with specified length, welding of cores, thermal treatment, measurement of geometric and power parameters and application of protective coating. In order to achieve springs resistance and reduce deviations in height, after thermal treatment spring is pressed by axial load that exceeds F3 within the limits up to 300F3, where F3 is spring force at maximum deformation. If required, repeated pressing is done by load increased proportionally to ratio of required yield to yield from application of the first load. At that loads may be vibrational.

EFFECT: higher dynamic strength, with accurate and time-stable elastic properties in process of their operation with contact of turns.

3 cl

 

The invention relates to the manufacture of stranded helical compression spring in mechanical engineering.

A known method of manufacturing a stranded springs in U.S. Pat. RU # 2186652 S1, which includes the twisting and stretching of the wire, the strand of wire and winding it on a mandrel in a single operation with a simultaneous twisting and stretching of the wire. Wound the spring of desired length is cut off and sent for welding lived, heat treatment, measurement, geometric and strength parameters, applying a protective coating. This method can improve the performance of manufacturing springs for how separate [6] the manufacture of rope and coiling rope on the frame.

However, fabricated or otherwise stranded springs when working in conditions of impact or force of contact of the coils and cause contact reactions in the coils prematurely lose altitude and power settings, despite the use of samevolume compression springs force the maximum deformation of F3at onset 6 to 48 hours

The technical result, which is aimed invention is to provide a method allowing to make springs high dynamic strength, accurate and stable over time elastic characteristics when operating with the contact turns.

The technical result of the achievements is moved due to the new operations of the technological process and their new sequence, namely, the invention consists in that the method of manufacture of springs comprising a strand of wire and winding it on a mandrel, which is carried out in one operation with a simultaneous twisting and stretching wire, cut wound spring of a given length, the welding of the ends of the wire, heat treated spring, metering geometric and strength parameters and the protective coating, characterized in that after heat treatment to produce the pressing spring by precipitation axial load, the value of which exceeds F3and less than 300 F3where F3- force of the spring at its maximum deformation, and produce a re-pressing of the spring load is increased in proportion to the ratio of the desired precipitation of the spring to the sediment from the application of the initial load. When this load is applied by the vibration. When the desired height of the spring re-pressing is not required.

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 [2] provides precision springs in height and load. Time of application of the load with the seconds or fractions of a second. For a more uniform load distribution over the cross section of the coils of the spring it makes vibration [3].

The determination of the allowance for a draught of spring and the load is known and described in the literature: the allowance should be more precipitation in the spring in the product is approximately 1.5 allowance under normal senegalian, and be qualified by testing springs [6].

To effect the winding of the spring, you can use the Device for manufacturing a stranded coil springs" Pat. RU # 2210455 C1 [4]; to compress the spring, you can use the Device to contact samevolume springs" Pat. RU # 2251036 C1 [5]. Their work is represented in the above patents.

The method is as follows. In the device set filled wire coils on the number of veins springs, fix the ends of the wires (conductors) to the mandrel for winding the spring. Include the device, through which the winding of the spring to the desired length. Coiled spring cut, produce welding of the ends of the wire and heat treatment, Perform an operation of pressing the spring axial load, the value of which exceeds F3and less than 300 F3where F3- force of the spring at its maximum deformation, and produce a re-pressing of the spring load is increased in proportion to the ratio of the desired precipitation of the spring to the sediment on the application of the initial axial load. Measure geometric and strength parameters of the spring, cause the protective coating, produce preservation and packaging. When implementing the proposed method of manufacturing a multi-strand coil springs increases their resistance to contact turns.

Note: under the heat treatment of the spring means hardening with subsequent tempering in accordance with the procedures adopted for a certain brand of spring steels [7]. For patented wire applies only vacation.

Reference materials

1. Patent RU No. 2186652 C1, MCL B21F 35/00, 7/00, 01.08.2001.

2. A.S. The USSR 554915, MCL B21F 35/00, 10.07.1975.

3. A.S. The USSR 580474, MCL G01M 13/00, B21F 35/00, 19.07.1976.

4. Patent RU No. 2210455 C1, MCL B21F 35/00, 29.07.2002.

5. Patent RU No. 2251036 C1, MCL F16F 1/04, B21F 35/00 / 14.10.2003.

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 multi-strand coil springs, comprising a strand of wire rope and winding it on a mandrel, which is carried out in one operation with a simultaneous twisting and stretching wire, cut wound springs of desired length, the welding of the ends of the wire, heat treated spring, metering geometric and strength parameters and the protective coating, characterized in that the term after the processing to produce the pressing spring by precipitation axial load, the value of which exceeds F3and less than 300F3where F3- force of the spring at its maximum deformation.

2. The method according to claim 1, characterized in that to produce a re-pressing of the spring load is increased in proportion to the ratio of the desired precipitation of the spring to precipitate from the initial application of the axial load.

3. The method according to claim 1 or 2, characterized in that the load applied by the vibration.



 

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