High-speed steel cryogenic treatment process

A technology of cryogenic treatment and high-speed steel, applied in the field of heat treatment technology, can solve the problems of expensive equipment and long treatment time, and achieve the effects of fast cooling speed and temperature recovery speed, shortened cryogenic treatment time, and cheap treatment equipment.

Inactive Publication Date: 2014-01-22
SANMING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of gas cryogenic treatment process can certainly improve the service life and mechanical properties of high-sp...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1, a cryogenic treatment process for high-speed steel parts, comprising the following steps

[0017] (1) Suspend the high-speed steel parts that have been heat-treated and cooled to room temperature above the liquid nitrogen surface of the cryogenic treatment device for 20 minutes, or place them in a low-temperature environment with a temperature of -130°C for slow cooling and hold for 30 minutes ;

[0018] (2) Dip the workpiece into liquid nitrogen for liquid cryogenic treatment, the temperature of liquid nitrogen is -196°C; the immersion time of high-speed steel parts in liquid nitrogen is 3 hours;

[0019] (3) Take the workpiece out of the liquid nitrogen directly and place it in the environment of a programmable temperature-controlled heating device with an initial temperature of -130°C and slowly return to temperature for 30 minutes, and then return to room temperature in the air for slow return to temperature The processing time should depend on the si...

Embodiment 2

[0025] Embodiment 2, a cryogenic treatment process for high-speed steel parts, comprising the following steps

[0026] (1) Suspend the high-speed steel parts that have been heat-treated and cooled to room temperature above the liquid nitrogen surface of the cryogenic treatment device for 28 minutes, or place them in a low-temperature environment with a temperature of -125°C for slow cooling and hold for 35 minutes ;

[0027] (2) Dip the workpiece into liquid nitrogen for liquid cryogenic treatment, the temperature of liquid nitrogen is -188°C; the immersion time of high-speed steel parts in liquid nitrogen is 4 hours;

[0028] (3) Take the workpiece out of the liquid nitrogen directly and place it in the environment of a programmable temperature-controlling heating device with an initial temperature of -125°C and slowly return to temperature for 35 minutes, then place it in the air and return to room temperature for slow return to temperature The processing time should depend...

Embodiment 3

[0034] Embodiment 3, a cryogenic treatment process for high-speed steel parts, comprising the following steps

[0035] (1) Suspend the high-speed steel parts that have been heat-treated and cooled to room temperature above the liquid nitrogen surface of the cryogenic treatment device for 35 minutes, or place them in a low-temperature environment with a temperature of -120°C for slow cooling and hold for 40 minutes ;

[0036] (2) Dip the workpiece into liquid nitrogen for liquid cryogenic treatment, the temperature of liquid nitrogen is -180°C; the immersion time of high-speed steel parts in liquid nitrogen is 5 hours;

[0037] (3) Take the workpiece directly from the liquid nitrogen and place it in the environment of a programmable temperature-controlling heating device with an initial temperature of -120°C and slowly return to temperature for 40 minutes, and then return to room temperature in the air for slow return to temperature The processing time should depend on the siz...

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PUM

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Abstract

The invention discloses a high-speed steel cryogenic treatment process which comprises steps as follows: (1), a workpiece which finishes heat treatment and is cooled to the room temperature is suspended above a liquid nitrogen level for 20-35 minutes, or placed in a low-temperature environment at the temperature ranging from subzero 130 DEG C to subzero 120 DEG C and cooled slowly for heat preservation for 30-40 minutes; (2) the workpiece is immersed into liquid nitrogen for cryogenic treatment at the temperature ranging from subzero 196 DEG C to subzero 180 DEG C for 3-5 hours; (3) the workpiece is directly taken out from the liquid nitrogen and placed in a warming device, slowly heated for 30-40 minutes and then placed in the air to be heated to the room temperature for slow heating treatment, wherein the initial temperature of the warming device ranges from subzero 130 DEG C to subzero 120 DEG C, and the temperature of the warming device can be controlled programmatically; (4), the steps are repeated for 2-3 times; and (5) the workpiece is placed in a muffle furnace with a set temperature of 200 DEG C, tempered for one hour and then air-cooled to the room temperature. According to the process, the treatment time is short, the treatment equipment is relatively cheap, and the treatment effect is more ideal.

Description

technical field [0001] The invention belongs to the technical field of heat treatment technology, and relates to the heat treatment technology of high-speed steel, in particular to the cryogenic treatment technology of high-speed steel parts. Background technique [0002] Tungsten-molybdenum W6Mo5Cr4V2 high-speed steel (M2) is mainly used for machine tool tools, such as twist drills, taps, broaches, saw blades, milling cutters and other tools with complex shapes. The main advantages of the material are high toughness and good carbide uniformity, good hardness and wear resistance, and can withstand large vibration and impact loads. However, the heat treatment process steps of high-speed steel materials are cumbersome, and each procedure must be strictly controlled, and the entire batch of materials will be reimbursed if there is any carelessness. At the same time, the current method to improve the overall performance of cutting tools is mainly heat treatment, such as optimiz...

Claims

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Application Information

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IPC IPC(8): C21D6/04
Inventor 晋芳伟周志明魏剑熊昌炯吴龙
Owner SANMING UNIV
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