A method of increasing the force value of tension spring

A technology of tension spring and force value, which is applied in the field of spring manufacturing, can solve the problems of low force value, small initial tension that cannot meet the design requirements, and difficulty in reaching the force value performance required by use, so as to achieve the effect of increasing force value

Active Publication Date: 2016-06-01
HARBIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the processing of tension springs is formed by winding one-time lathe. During the winding process, workers manually control the coil material or the advancement of straight material to complete the winding process of tension spring. Generally, the diameter of the coil material is large, and the straight material is in the middle of the winding process. There will be no pre-tightening force during winding, resulting in gaps in the tension spring during winding, which will directly affect the force value of the spring. For helicopters and springs that require high stress for key components, it is difficult to achieve the force value performance required for use.
[0003] In the production of helicopters, the centrifugal stop block spring is used for the propeller hoop to limit the undulating effect. This part requires high performance and the preload force must meet certain requirements to meet the force value of the drawing. The existing processing method has low force value. Small initial tension can not meet the design requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of centrifugal stopper spring

[0029] Drawing requirements:

[0030] Material: 1Cr18Ni9 steel wire diameter: Outer diameter of spring:

[0031] Free height: 60.5±1mm Working circle: 38.5±1

[0032] The first point of force: when the length is 68.4, the force value is 15.2±1.06N

[0033] The second point of force: when the length is 94.4, the force value is 22.5±1.57N

[0034] 1. Turner: For the first winding, place the steel wire on the material rack as a coil, and fix one end of the material at the feed clamp of the lathe. According to the requirements of the drawing, select the hanging buckle and pitch, and perform close winding processing to ensure the outer diameter of the spring:

[0035] 2. Cutting: Leave a margin for secondary winding at each end according to the required length, and ensure that the number of working turns is 44.5-46.5 to cut the steel wire.

[0036] 3. Tempering treatment: The first-wrapped workpiece is kept in a tempering circulating temperi...

Embodiment 2

[0048] Preparation of centrifugal stopper spring

[0049] Drawing requirements:

[0050] Material: 70C steel wire diameter: Outer diameter of spring:

[0051] Free height: 50±1mm working circle: 22±1

[0052] The first point of force: when the length is 65, the force value is 57±4N

[0053] The second point of force: when the length is 75, the force value is 70±6N

[0054] 1. Turner: For the first winding, place the steel wire on the material rack as a coil, and fix one end of the material at the feed clamp of the lathe. According to the requirements of the drawing, select the hanging buckle and pitch, and perform close winding processing to ensure the outer diameter of the spring:

[0055] 2. Cutting: Leave a margin for secondary winding at each end according to the required length to ensure that the number of working turns is 22-24 to cut the steel wire.

[0056] 3. Tempering treatment: The first-wrapped workpiece is kept in a tempering circulating tempering furnace at a temperature o...

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PUM

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Abstract

The invention belongs to a spring manufacturing technology, and relates to a method for increasing the force value of an extension spring. The method adopts a twice winding technology; a certain stress is generated during the first winding; a pre-tightening force is effectively increased for the second winding because of the principle that the greater the acting force is, the greater the counter-acting force is during the second winding; thus, the force value of the spring is increased, unnecessary trial-manufacture and waste are avoided, and the rolled throughput yield of the elastic part is increased. The method is not only applicable to springs at key parts of a helicopter but also applicable to processing and production of all major parts requiring higher stress.

Description

Technical field [0001] The invention belongs to spring manufacturing technology and relates to a method for improving the force value of a tension spring. Background technique [0002] At present, the processing of the tension spring is formed by winding a lathe. During the winding process, the winding process of the tension spring is completed by the worker's manual control of the coil or the advancement of the straight material. Generally, the diameter of the coil is larger and the straight material is in No pre-tightening force is generated during winding, so that the tension spring produces a gap during winding and directly affects the force value of the spring. For helicopters and key components that require high stress springs, it is difficult to achieve the required force performance. [0003] In the production of helicopters, the centrifugal stopper spring is used for the propeller hoop to limit the undulation. This part requires high performance and the pre-tightening forc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 王勇缨
Owner HARBIN
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