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Quenching method for hot work die steel

A technology of hot working die steel and cooling method, which is applied in the field of metal heat treatment, can solve the problems of fast cooling speed, workpiece deformation, uneven thermal expansion and contraction, etc., to reduce deformation, facilitate production and use, and avoid deformation out of tolerance and scrap Effect

Pending Publication Date: 2014-11-26
FOSHAN SUMMIT NIKKA MOLD & METAL PROD CO LTD
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  • Abstract
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Problems solved by technology

However, the cooling speed is fast, and the internal stress caused by the uneven thermal expansion and contraction inside the workpiece may deform or crack the workpiece.

Method used

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  • Quenching method for hot work die steel
  • Quenching method for hot work die steel

Examples

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Embodiment example 1

[0022] Please see attached figure 1 , a method for quenching and cooling hot work die steel, the method sequence includes the following steps:

[0023] (1) Place the hot-work die steel workpiece that has been quenched and protected to be heat-treated in a high-pressure vacuum furnace, set the vacuum process parameters according to the technical requirements of the hot-work die steel workpiece, and raise the temperature in stages according to the set process parameters. After reaching the quenching temperature of the set vacuum process, heat preservation is carried out at the quenching temperature, and the heat preservation time refers to the set vacuum process;

[0024] (2) After the heat preservation process described in step (1) is over, the hot-work die steel workpiece through step (1) is subjected to temperature-controlled cooling in a temperature zone above 650° C. in the high-pressure vacuum furnace, and the hot-work die steel workpiece is Control the temperature and co...

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Abstract

The invention discloses a quenching method for hot work die steel. According to the method, after protection is carried out according to the shape and size of a hot working die, a hot work die steel workpiece is treated in the manner of segmented temperature-controlled cooling under the condition of a temperature above martensite initiating transformation temperature; control of temperature in a high-pressure vacuum furnace is realized by using computer analog technology, the law of changing of the rotating speed of a fan with a temperature field in the furnace is controlled to realize automatic adjusting, so temperature changes of the die in the furnace is controlled. The quenching method for hot work die steel provided by the invention fully reduces temperature difference between and thermal stress on the surface of the hot work die steel workpiece and a core material, enables influence of thermal stress on quenching deformation to be greatly weakened when a hot work die steel material transforms from an austenite structure state to a martensite structure state, reduces cracking risks of the hot work die by changing cooling rates during quenching and allows a high impact toughness value to be obtained.

Description

technical field [0001] The invention relates to a metal heat treatment method, in particular to a quenching and cooling method for hot work die steel. Background technique [0002] In recent years, with the rapid development of my country's manufacturing industry, the mold industry and die steel manufacturers have made great progress. put forward higher requirements. In the prior art, the thickness of the hot work mold is generally about 100mm to 300mm. During the cooling process of the hot work mold, there is a certain difference in the cooling rate between the surface and the core. If the difference is large enough, it may cause the cooling rate to exceed the critical cooling rate. Part of it transforms into martensite, and the core area below the critical cooling rate will inevitably produce upper bainite structure during quenching. The larger the size of the die steel, the larger the area occupied by the upper bainite structure. The formation of bainite structure will s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/19
Inventor 陈涛
Owner FOSHAN SUMMIT NIKKA MOLD & METAL PROD CO LTD
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