Local annealing method and annealing device for high temperature alloy steel blind rivet sleeve

Abstract

The invention discloses a local annealing method and an annealing device for a rivet cover of a high-temperature alloy self-plugging rivet. The method comprises the step of annealing the rivet cover locally by forming a temperature field with a temperature gradient in a heating process of the rivet. The annealing device employed by the annealing device for the rivet cover of the high-temperature alloy self-plugging rivet comprises a heating system and an auxiliary heating cover externally sleeving the rivet cover. According to the method and device disclosed by the invention, the temperature of the local heating region of the rivet cover can be precisely controlled in a production process of the self-plugging rivet, and the local heat treatment effect is relatively good, so that the hardness of the rivet cover changes in gradient, the production quality of the rivet cover is stable, the quality of the rivet cover is improved, the rate of finished products is improved, the operation is simple, batch production is facilitated, and the heat treatment process is precisely controlled.

Description

technical field [0001] The invention relates to an annealing technology for a blind rivet sleeve, in particular to a local annealing method and an annealing device for a high-temperature alloy steel blind rivet sleeve. Background technique [0002] High-temperature alloy steel (A-286) blind rivet sets are aviation standard parts. The volume and effective heating area of ​​the blind rivet sleeve are very small, and there are some problems in the heat treatment process: the heat transfer on the surface of the nail sleeve is too fast during the high-frequency induction heating process, and the heating area is difficult to control, especially during partial annealing. It is often easy to exceed the set annealing area; uneven heating can easily cause excessive local temperature differences, often part of the area is lower than the set temperature of heat treatment, while the temperature of other areas is higher, and even causes parts to crack, failing to achieve local heat treatm...

AI Technical Summary

Problems solved by technology

The volume and effective heating area of ​​the blind rivet sleeve are very small, and there are some problems in the heat treatment process: the heat transfer on the surface of the nail sleeve is too fast during the high-frequency induction heating process, and the heating area is difficult to control, especially during partial annealing. It is often easy to exceed the set annealing area; uneven heating can easily cause excessive local temperature differences, often part of the area is lower than the set temperature of heat treatment, while the temperature of other areas is too high, even causing parts to crack, and the local heat treatment cannot be achieved. Requirements: Inaccurate control of the heat treatment process, poor repeatability, the operation process is often only based on worker experience, poor product quality stability in mass production, and low yield

[0003] Therefore, in the production process of blind rivet sets, there are disadvantages such as poor local heat treatment effect, unstable product quality, poor product quality, low yield, high cost, difficulty in mass production, and inaccurate heat treatment process control.

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