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Part shrinkage method and part shrinkage tooling

A technology of parts and shrinkage cavity, which is applied in the field of heat treatment, can solve the problems of increasing the risk of parts scrapping, and achieve the effect of ensuring the effect, reducing the increase of deformation, and reducing the increase of deformation

Active Publication Date: 2021-09-24
CHONGQING GEARBOX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the existing shrinkage cavity treatment technology can achieve the purpose of shrinkage cavity to a certain extent, the shrinkage cavity of parts is often accompanied by greater deformation, which increases the risk of scrapping parts

Method used

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  • Part shrinkage method and part shrinkage tooling

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Effect test

no. 1 Embodiment

[0038] The first specific embodiment of the present invention provides a method for part shrinkage. The part shrinkage method comprises the following steps:

[0039] Before entering the furnace, use the corresponding measuring tool to measure the short axis size of the inner hole of the part to be shrunk, and reasonably select the appropriate size of the inner film tooling according to the size;

[0040] When tires are mounted on parts to be shrunk, the inner film tooling is coaxially arranged in the hole of the part to form a combined part, wherein the difference between the outer diameter of the inner film tooling and the inner diameter of the part is greater than zero, preferably, the difference 200mm to 400mm;

[0041] Send the combined parts into the heat treatment furnace for shrinkage treatment.

[0042] Specifically, the above-mentioned "shrinkage cavity treatment" process includes the following steps:

[0043] Step S21: Heat the combined parts to 650±100°C and keep...

no. 2 Embodiment

[0051] The second specific embodiment of the present invention provides a part shrinkage tooling that can be applied to the part shrinkage method provided in the first specific embodiment of the present invention. see figure 1 , figure 1 It is a schematic diagram of the assembly structure of the parts shrinkage tooling and parts provided by the second specific embodiment of the present invention.

[0052] The part shrinkage tooling provided by the second specific embodiment of the present invention includes an inner film tooling 4, a base 1, a cover plate 6 and a plurality of gaskets. in:

[0053] The inner film tooling 4 is used to be coaxially arranged in the hole of the part 3 to be shrinked to form a combined part, and the shrinkage process is performed with the part 3, wherein the difference between the outer diameter of the inner film tooling and the inner diameter of the part 3 is greater than Zero, preferably, the difference is 200mm to 400mm;

[0054] The part 3 and...

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Abstract

The invention discloses a part shrinkage method and a part shrinkage tooling. The part shrinkage method comprises the following steps: when the part to be shrunk is mounted, the inner film tooling is coaxially arranged in the hole of the part to form a combined part, and the difference between the outer diameter of the inner film tooling and the inner diameter of the part is greater than Zero; then the combined parts are sent into the heat treatment furnace for shrinkage treatment. The part shrinkage method and the part shrinkage tooling provided by the present invention adopt the inner film tooling, which can continuously compensate for the heat loss of the part during the cooling and shrinkage process of the part, and reduce the increase in deformation of the part due to uneven cooling, thereby ensuring that the parts Shrinkage cavity effect, reducing the tendency of parts to increase deformation after shrinkage cavity.

Description

technical field [0001] The invention relates to the technical field of heat treatment, in particular to a part shrinkage method and a part shrinkage tooling. Background technique [0002] In the gear industry, the ring gear is a part of the gear, and as one of the transmission parts, its performance and quality directly affect the entire product. Due to the influence of the chemical composition uniformity, purity, hardenability, part structure design, forging process, machining process, heat treatment process and related equipment of the part material, the part will have excessive deformation or excessive expansion, resulting in Parts cannot be machined to a finished product. [0003] In view of the above situation, the shrinkage cavity treatment technology adopted in the prior art is: the parts are heated at a temperature above AC3 for a period of time and then air-cooled, or the parts are cooled at a temperature below Ar1 for a period of time and then cooled rapidly. (Wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/00C21D9/32
CPCC21D1/00C21D9/32
Inventor 黄文鹏唐跃飞党军玲仲博颖胡云权解明雨
Owner CHONGQING GEARBOX