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Heat treatment tool and method eliminating structural heredity of low-carbon alloy steel disc-shaped part and reducing deformation

A technology of low-carbon alloy steel and heat treatment methods, applied in heat treatment furnaces, heat treatment equipment, quenching devices, etc., can solve problems such as high technical and management requirements, inability to meet deformation requirements, and decline in production efficiency, and achieve the elimination of tissue genetics , good comprehensive mechanical properties, long-term effect

Inactive Publication Date: 2018-07-27
NANJING INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used equipment for parts heat treatment includes pit furnaces, quenching oil tanks, box-type tempering furnaces, etc. Using conventional heat treatment methods, disc-shaped parts are laid flat in the furnace or stacked in the furnace after using tooling intervals, quenched in the furnace, and placed directly after cleaning. Tempering in the tempering furnace has been proven to be unable to meet the deformation requirements
In order to reduce the warping of parts, some manufacturers weld the parts in pairs before quenching, and then cut them after tempering. This method consumes manpower and material resources and greatly reduces production efficiency.
For example, if a quenching press is introduced and the shape-correcting force is applied at the same time as quenching, not only the shape-correcting effect is unknown, but also the initial investment is high, requiring high technical and management levels, and only one-piece heat treatment can be performed, and the production efficiency will also decrease.

Method used

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  • Heat treatment tool and method eliminating structural heredity of low-carbon alloy steel disc-shaped part and reducing deformation
  • Heat treatment tool and method eliminating structural heredity of low-carbon alloy steel disc-shaped part and reducing deformation
  • Heat treatment tool and method eliminating structural heredity of low-carbon alloy steel disc-shaped part and reducing deformation

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Comparison scheme
Effect test

Embodiment 1

[0037] A heat treatment method for eliminating microstructure inheritance and reducing deformation of low-carbon alloy steel disc-shaped parts, comprising the following steps:

[0038] S01. Suspension loading of disc-shaped parts: The disc-shaped parts are hung on the quenching anti-deformation tooling and placed in the well-type quenching heating furnace; the purpose is to realize the hanging furnace loading method of the disc-shaped parts in the well-type quenching heating furnace, and then When the disc-shaped part is heated, the direction of gravity is changed from axial to radial, and all directions are not restricted when heated and expanded after hanging, and the expansion occurs evenly;

[0039] S02. Normalizing for the first time: heat the disc-shaped parts suspended on the quenching anti-deformation tooling to 640°C in a well-type quenching heating furnace, keep it for 2 hours, continue heating to 840°C, keep it for 2 hours, and heat it again to 940°C. Keep warm for ...

Embodiment 2

[0047] A heat treatment method for eliminating microstructure inheritance and reducing deformation of low-carbon alloy steel disc-shaped parts, comprising the following steps:

[0048] S01. The disc-shaped parts are hung in the furnace: the disc-shaped parts are hung on the quenching and anti-deformation tooling, and placed in the well-type quenching heating furnace;

[0049] S02. Normalizing for the first time: heat the disc-shaped parts suspended on the quenching anti-deformation tooling to 650°C in a well-type quenching heating furnace, keep it for 2.5 hours, continue heating to 850°C, keep it for 2.5 hours, and heat it again to 970°C ℃, keep warm for 9 hours, take out the oven and air cool to room temperature;

[0050] S03, the second normalizing: Put the disc-shaped parts suspended on the quenching anti-deformation tooling into the well-type quenching heating furnace again and heat to 650°C, keep it for 2.5h, continue heating to 850°C, keep it for 2.5h, and heat again To...

Embodiment 3

[0055] A heat treatment method for eliminating microstructure inheritance and reducing deformation of low-carbon alloy steel disc-shaped parts, comprising the following steps:

[0056] S01. The disc-shaped parts are hung in the furnace: the disc-shaped parts are hung on the quenching and anti-deformation tooling, and placed in the well-type quenching heating furnace;

[0057] S02. First normalizing: heat the disc-shaped part suspended on the quenching and deformation-proof tooling to 660°C in a well-type quenching furnace, keep it for 3 hours, continue to heat it to 860°C, hold it for 3 hours, and heat it again to 1000°C. Keep warm for 12 hours, take out of the oven and air cool to room temperature;

[0058] S03, the second normalizing: Put the disc-shaped parts suspended on the quenching anti-deformation tooling into the well-type quenching heating furnace again and heat to 660°C, keep it for 3h, continue to heat to 860°C, keep it for 3h, and heat it again to 930°C ℃, keep w...

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PUM

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Abstract

The invention discloses a heat treatment tool and method eliminating structural heredity of a low-carbon alloy steel disc-shaped part and reducing deformation and belongs to the technical field of metal heat treatment. Simple operation conditions are adopted, and the effects that grains are refined, structural heredity is eliminated, and deformation of the large-size disc-shaped part is reduced are achieved. The heat treatment method comprises the following steps of part hanging and charging, the first time of normalizing, the second time of normalizing, quenching, cleaning, part modificationand high temperature tempering. During part charging and part modification, a quenching anti-deformation tool and a tempering sizing tool are used. The quenching anti-deformation tool comprises a chassis, suspender, a cross-shaped material frame, a sleeve and a locating pin, the purpose is to achieve part hanging and charging of the first step of the heat treatment method, and thus warping, ellipse, plane taper, end face run-out and other deformation conditions during part heat treatment are reduced. The tempering sizing tool is of an annular structure and can supports up the part after charging, and sizing is further conducted through part self weight during tempering.

Description

technical field [0001] The invention belongs to the technical field of metal heat treatment, and in particular relates to a heat treatment tool and method for eliminating the inheritance of the microstructure of low-carbon alloy steel disc-shaped parts and reducing deformation. Background technique [0002] The genetic phenomenon of microstructure in steel means that the original non-equilibrium microstructure (martensite, bainite, Widmanstatten microstructure, etc.) after a certain heat treatment, the new austenite grains formed are not refined, but retained The original coarse grain phenomenon is eliminated. When the structure before heating is relatively coarse, the austenite structure after heating is relatively coarse; when the structure before heating is relatively fine, the austenite structure after heating is fine. That is, the grain size after tissue inheritance is directly affected by the original tissue. Under the premise of a steel grade, when the structure is b...

Claims

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Application Information

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IPC IPC(8): C21D9/00C21D1/62
CPCC21D9/0068C21D1/62
Inventor 丛园巨佳张保森胡谦朱帅帅戴玉明王章忠
Owner NANJING INST OF TECH