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High temperature short time ageing effect technique for beryllium bronze manufactured volute heilical spring

A helical spring and beryllium bronze technology, which is applied in the field of heat treatment aging strengthening technology, can solve problems such as greatly increased friction, spring waste, and spring manufacturing failure, and achieve high aging temperature, short aging time, and small deformation.

Inactive Publication Date: 2008-06-11
CHANGAN AUTOMOBILE (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the precipitation of the γ-phase of the beryllium bronze material in the α-phase grains and the effects of structural stress and thermal stress, as the internal structure of the beryllium bronze changes with the continuation of the aging time, the structural transformation causes each coil of the spring to deform. Deformation and mutual contact cause the friction between the rings to increase greatly, so that after the spring is pressed to the height of a ring when the external force is unloaded, the spring cannot bounce up and cannot return to the original initial state, which means that the manufacturing of the spring has failed. The spring is waste product
Therefore, the conventional heat treatment failure process cannot carry out the production of this kind of pagoda-shaped reel sheath spring at all.

Method used

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  • High temperature short time ageing effect technique for beryllium bronze manufactured volute heilical spring
  • High temperature short time ageing effect technique for beryllium bronze manufactured volute heilical spring
  • High temperature short time ageing effect technique for beryllium bronze manufactured volute heilical spring

Examples

Experimental program
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Effect test

example 1

[0012] Example 1: Part name: right sheath spring, material: QBe1.9Cr, raw material state: 780°C, water cooling, supersaturated α solid solution is obtained, and the shape of the part is shown in Figure 2. Technical requirements: ①Rotation: left. ②Total number of turns: 19③Effective number of turns: 17④Tolerance of non-uniformity of lift between turns is 2mm. ⑤The belt thickness is 0.30mm. ⑥Expanded length: 1103 mm. ⑦Heat treatment: aging. ⑧ Acceptance technical conditions shall be implemented according to WJ532-93.

[0013] First use the special spring mandrel shown in Figure 3 (technical requirements: ①The processing surface F is in a spiral shape. ②Direction: left-handed. ③Intercept: 5.5④Left angle: 0345⑤Total number of turns: 20⑥Axis line displacement: 7.25⑦ Material: 35⑧Heat treatment: HRC28-36) The non-ferrous metal material QBe1.9Cr with a width of 10 mm, a length of 1200 mm and a thickness of 0.30 mm is wound into shape, and the beryllium copper sheet at the big end...

example 2

[0014] Example 2: Part name: left sheath spring, material: QBe1.9Cr, raw material state: 780°C, water cooling, to obtain a supersaturated α solid solution state, the shape of the part is shown in Figure 4. (Technical requirements: ① Rotation: left. ② Total number of turns: 12. ③ Effective number of turns: 10. ④ Tolerance of non-uniformity of lift between turns: 2 mm. ⑤ Strip thickness: 0.30 mm. ⑥ Expanded length: 920 mm. ⑦ Heat treatment: Aging. ⑧ Acceptance technical conditions shall be implemented according to WJ532-93.)

[0015] First use the special spring-wound mandrel shown in Figure 5 (technical requirements: ① processing surface F is spiral. ② direction: left-handed. ③ intercept: 6 ④ lift angle: 0352 ⑤ total number of turns: 17 ⑥ axis line displacement: 6 ⑦ material: 35⑧Heat treatment: HRC28-36) The non-ferrous metal material QBe1.9Cr with a width of 10 mm, a length of 950 mm, and a thickness of 0.30 mm is made into a mold, and the beryllium bronze sheet at the big end...

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Abstract

The invention relates to a high temperature short time aging process for the flat spiral spring made of beryllium bronze. The invention is characterized in that firstly, the flat spiral spring of non-ferrous material of QBe1.9Cr is completely coiled around the mandrel axle, the main end of the spring is bound and fixed with an iron wire, the mandrel axle and the flat spiral spring are arranged in the salt tempering furnace for aging, the aging temperature is 345 plus or minus 2 DEG C, the aging holding time is 7 minutes, and after the aging soaking, the spring is arranged in the water of normal temperature of 5 to 30 DEG C to be cooled for 1 minute. The invention has the advantages that the aging time is short, the aging temperature is high, the deformation of the pagoda shaped spring is little, and the amount of deformation of each circle of the spring is smaller than 0.02 millimeter, the requirement of the enormous quantities production of the pagoda shaped spring can be fully met.

Description

technical field [0001] The invention relates to a heat treatment aging strengthening process of nonferrous metal material Qbe1.9C. Background technique [0002] The spiral coil spring made of beryllium bronze, commonly known as pagoda-shaped spring, due to the extremely high geometrical and dimensional accuracy requirements of the spring, the gap between the coils of the spring must be uniform. At present, the conventional non-ferrous metal material QBe1.9Cr heat treatment aging strengthening process is beryllium bronze solution treatment, the solution treatment temperature is 780°C-790°C, water cooling, the aging temperature is 310°C-330°C, and the aging holding time is 2 hours to 3 hours. Due to the precipitation of the γ-phase of the beryllium bronze material in the α-phase grains and the effects of structural stress and thermal stress, as the internal structure of the beryllium bronze changes with the continuation of the aging time, the structural transformation causes ...

Claims

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Application Information

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IPC IPC(8): C21D9/02C22F1/08
Inventor 付在再
Owner CHANGAN AUTOMOBILE (GRP) CO LTD
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