Heat treatment device and heat treatment method

Abstract

The present invention relates to a heat treatment apparatus and a heat treatment method that control temperature distribution during cooling. There is provided a cooling step in which a heated treatment object is cooled using a cooling liquid in mist form, and heat treatment is performed by alternatingly repeating a first step (K1) in which the treatment object is cooled at a first mist density, and a second step (K2) in which the treatment object is cooled at a second mist density that is less dense than the first mist density.

Description

technical field [0001] The present invention relates to a heat treatment device and a heat treatment method, and is a heat treatment device that can be suitably used for treatments such as quenching of a treatment object, for example. [0002] This application claims priority based on Japanese Patent Application No. 2009-028900 filed in Japan on February 10, 2009, and Japanese Patent Application No. 2009-047227 filed in Japan on February 27, 2009, and uses the contents thereof here. Background technique [0003] In a heat treatment apparatus that heats and cools a metal material to be processed to perform a treatment such as quenching, when high-speed cooling is required, an oil-cooling type cooling device and a gas-cooling type cooling device have conventionally been used. In the cooling device of the above-mentioned oil cooling system, the cooling efficiency is excellent, but there is a problem that it is almost impossible to perform fine cooling control and the heat-treat...

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Problems solved by technology

[0007] If there is uneven distribution of spray density in the cooling chamber, the cooling characteristics will be different and there may be uneven temperature distribution on the object to be processed.

Also, when there are multiple objects to be processed, temperature differences may occur among the objects to be processed depending on the distribution of spray density

[0008] When uneven temperature distribution occurs on the object to be treated in this way, it may become a cause of deformation of the object to be processed, and when the object to be treated with uneven temperature distribution is used for quenching treatment, the object may be deformed. Can't get the same hardness

[0009] On the other hand, when a temperature difference occurs among a plurality of objects to be processed, there is a possibility of a quality difference among the objects to be processed, resulting in poor quality.

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