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Method for heat treatment of expanding mold piece

A heat treatment method and die technology, which are used in heat treatment furnaces, heat treatment equipment, furnaces, etc.

Active Publication Date: 2014-12-10
衡阳市蒸湘星宇热处理厂 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the heat treatment process of similar dies

Method used

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  • Method for heat treatment of expanding mold piece
  • Method for heat treatment of expanding mold piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The die in this embodiment is a C12Mo1V1 die that has been quenched and deformed.

[0015] 1) Self-gravity shape correction: adopt the suspension method, enter the furnace at room temperature, raise the furnace temperature to 600 °C, add nitrogen to the furnace, add alcohol at a rate of 45 drops / min, and add kerosene at a rate of 25 drops / min. Heat preservation under atmosphere protection for 2.5h; raise the furnace temperature to 850°C, continue to add nitrogen into the furnace, add alcohol at a rate of 50 drops / min, add kerosene at 60 drops / min, and keep warm for 3h under the aforementioned atmosphere protection; put the furnace When the temperature rises to 1030°C, continue to add nitrogen into the furnace, add alcohol at a rate of 50 drops / min, add kerosene at a rate of 60 drops / min, and keep the temperature for 80 minutes under the protection of the aforementioned atmosphere; When the furnace temperature is cooled to 180 ℃, it is released;

[0016] 2) Quenching: P...

Embodiment 2

[0020] The die in this embodiment is a C12MoV die that has been quenched and deformed.

[0021] 1) Self-gravity shape correction: adopt the suspension method, enter the furnace at room temperature, raise the furnace temperature to 620°C, add nitrogen to the furnace, add alcohol at a rate of 42 drops / min, and add kerosene at a rate of 25 drops / min. Heat preservation under atmosphere protection for 2 hours; raise the furnace temperature to 850°C, continue to add nitrogen into the furnace, add alcohol at a rate of 48 drops / min, add kerosene at 55 drops / min, and keep warm for 2.5 hours under the aforementioned atmosphere protection; The temperature rises to 1010°C, continue to add nitrogen into the furnace, add alcohol at a rate of 48 drops / min, add kerosene at a rate of 55 drops / min, and keep the temperature for 60 minutes under the protection of the aforementioned atmosphere; When the furnace temperature is cooled to 180 ℃, it is released;

[0022] 2) Quenching: The enlarged di...

Embodiment 3

[0026] The die in this example is an unquenched C12MoV die with severe deformation.

[0027]1) Self-gravity shape correction: adopt the suspension method, enter the furnace at room temperature, raise the furnace temperature to 600 °C, add nitrogen to the furnace, add alcohol at a rate of 42 drops / min, and add kerosene at a rate of 25 drops / min. Heat preservation under atmosphere protection for 2 hours; raise the furnace temperature to 880°C, continue to add nitrogen into the furnace, add alcohol at a rate of 50 drops / min, add kerosene at 60 drops / min, and keep warm for 2.5 hours under the aforementioned atmosphere protection; stop heating , the fan is cooled by uniform temperature; when the furnace temperature is cooled to 180 ℃, it is released;

[0028] 2) Quenching: The enlarged diameter die that has undergone self-gravity correction by heating is suspended into the furnace, nitrogen is added to the furnace, the furnace temperature is raised to 550°C, and the temperature is ...

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Abstract

The invention discloses a method for heat treatment of a deformed expanding mold piece. The method comprises the following steps of: carrying out heating, hanging and self-gravity shape-correcting treatment on a quenched and seriously-deformed mold piece under the protection of an atmosphere formed by nitrogen, alcohol and kerosene, carrying out quenching treatment after cooling, and finally carrying out secondary tempering and flat plate shape correction; or carrying out heating, hanging and self-gravity shape-correcting treatment on an unquenched mold piece subjected to serious machining deformation under the protection of the atmosphere formed by nitrogen, alcohol and kerosene, carrying out quenching treatment after annealing and cooling, and finally carrying out the secondary tempering and flat plate shape correction. The quenched deformed mold piece and the unquenched deformed mold piece subjected to the treatments are good in flatness, the material quality of the mold piece is obviously improved in various parameters including bending strength, impact toughness, hardness and the like, the requirements for machining can be met, and the expanding mold piece cannot deform after machining.

Description

technical field [0001] The invention relates to a heat treatment method for a diameter-expanding die used in a mechanical diameter-expanding machine, in particular to a heat treatment method for a deformed diameter-expanding die. Background technique [0002] Expanding dies for mechanical expanding machines-die sheets are a very critical mold for forming steel pipes. At present, my country mainly buys them from German SMS MEER and Dutch FONTIJINE GROTNES. It is required to be able to expand 20,000 to 30,000 pipes stably. [0003] During the expansion process, in order to cause the expansion deformation of the steel pipe, the expansion machine dies need to withstand huge pressure and friction. In order to ensure the performance of the dies, the cold work die steels C12Mo1V1 and C12MoV with high wear resistance and micro deformation are currently used. preparation. Since the length / thickness of the die reaches 25, the heat treatment deformation is very serious, which brings g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/00C21D1/18
Inventor 王阳春王振生赵威为张孟恩杨双双郭源君宋力彭真
Owner 衡阳市蒸湘星宇热处理厂
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