Method and device of local heat treatment for thin-walled tubular parts

Abstract

The invention discloses a method and a device of local heat treatment for thin-walled tubular parts. A high-frequency induction heater is used as a heating source. The inner diameter of a high-frequency induction ring of the high-frequency induction heater is 5-30mm larger than the outer diameter of a heating-expected area of the thin-walled tubular part. The high-frequency induction ring with the heating power is capable of heating the heating-expected area of the thin-walled tubular part to required heating temperature in 10-60 seconds. When the thin-walled tubular part is subjected to local heat treatment, an auxiliary heating sleeve tool is used to sleeve the local heat area to be subjected to heat treatment. A gap between the inner surface of the heating sleeve tool and the sleeved position of the thin-walled tubular part is larger than 0.1mm and smaller than 1mm. The wall thickness of the heating sleeve tool is 2-10mm. The thin-walled tubular part is rotated around a center line of the high-frequency induction ring. The method and the method have the advantages that the heat area can be controlled effectively, heating is even, product quality is high and stable, operation is simple, manufacturing and using costs are low, and the method and the device are applicable to batch production, and the like.

Description

technical field [0001] The invention relates to a method and device for local heat treatment of thin-walled tubular parts, and belongs to the technical field of local heat treatment of thin-walled parts. Background technique [0002] At present, most heat treatment devices are only suitable for overall treatment of workpieces, and there are few methods and devices for partial heat treatment of workpieces. Especially for local heat treatment of small thin-walled parts, it is still an unbroken technical problem. When heat treating thin-walled parts, due to its small effective heating area and volume, there are still some problems in the prior art: a) The heat conduction is too fast during the heating process, and the heating area is not easy to control, especially in the local annealing process It is often easy to exceed the set annealing area; b) uneven heating can easily cause excessive local temperature differences, often part of the area is lower than the set temperature ...

AI Technical Summary

Problems solved by technology

[0002] At present, most heat treatment devices are only suitable for overall treatment of workpieces, and there are few methods and devices for local heat treatment of workpieces

Especially for local heat treatment of small thin-walled parts, it is still an unbroken technical problem

When heat treating thin-walled parts, due to its small effective heating area and volume, there are still some problems in the prior art: a) The heat conduction is too fast during the heating process, and the heating area is not easy to control, especially in the local annealing process It is often easy to exceed the set annealing area; b) 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, failing to reach Requirements for partial heat treatment; c) 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

Therefore, the existing local heat treatment methods for thin-walled parts are still not ideal enough to meet the needs of production and use.

Images