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Water-air-water quenching heat treatment process for T10 steel screw taps for machines

A machine-used tap and water quenching technology, which is applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems such as insufficient hardenability of workpieces, achieve no harm to health, high economic benefits, and reduced deformation and cracking Effect

Inactive Publication Date: 2015-06-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a water-air-water quenching heat treatment process for T10 steel machine taps, which can solve the defects produced by the traditional quenching process, and does not generate oily fumes during the production process, thereby reducing environmental pollution and improving due to oil quenching. The disadvantage of insufficient hardenability of the workpiece, increase the hardness, improve its structure and performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Diameter φ6mm T10 steel machine tap, containing C: 1.01%, Si: 0.33%, Mn: 0.35%, P: 0.030%, S: 0.030%;

[0021] 1) Heat the machine tap to 780°C and keep it warm for 2 hours to make it austenitized;

[0022] 2) Put the machine tap into the water medium to quench and cool for 6 seconds;

[0023] 3) Take the machine tap out of the water and place it in the air to cool for 11 seconds;

[0024] 4) Put the machine tap into the water medium and cool to room temperature;

[0025] 5) Transfer the machine tap into a tempering furnace at 200°C for tempering heat treatment for 3.5 hours;

[0026] 6) Air-cool the machine tap to room temperature;

[0027] After testing, the surface hardness can reach 63HRC, and the core hardness can reach 53HRC. The toughness and service life are stronger than those of conventional heat treatment, and the phenomenon of deformation and cracking is greatly reduced.

Embodiment 2

[0029] Diameter φ6mm T10 steel machine tap, containing C: 1.01%, Si: 0.33%, Mn: 0.35%, P: 0.030%, S: 0.030%;

[0030] 1) Heat the machine tap to 800°C and keep it warm for 2 hours to make it austenitized;

[0031] 2) Put the machine tap into the water medium for quenching and cooling for 5 seconds;

[0032] 3) Take the machine tap out of the water and place it in the air to cool for 10 seconds;

[0033] 4) Put the machine tap into the water medium and cool it down to 30°C;

[0034] 5) Transfer the machine tap into a tempering furnace at 180°C for tempering heat treatment for 3 hours;

[0035] 6) Air-cool the machine tap to room temperature;

[0036] After testing, the surface hardness can reach 62HRC, and the core hardness can reach 51HRC. The toughness and service life are stronger than those of conventional heat treatment, and the phenomenon of deformation and cracking is greatly reduced.

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Abstract

The invention relates to a water-air-water quenching heat treatment process for T10 steel screw taps for machines. The water-air-water quenching heat treatment process includes steps of 1), heating the screw taps for the machines, preserving heat of the screw taps and austenitizing the screw taps for the machines; 2), quenching and cooling the screw taps in water media; 3), taking the screw taps out of water and cooling the screw taps in air; 4), cooling the screw taps in water media until the temperatures of the screw taps reach the room temperature; 5), shifting the screw taps for the machines into tempering furnaces and carrying out tempering heat treatment on the screw taps for the machines; 6), cooling the screw taps for the machines by air until the temperatures of the screw taps for the machines reach the room temperature. Compared with the traditional process, the water-air-water quenching heat treatment process has the advantages that the water-air-water quenching heat treatment process is free of lampblack or fire hazards or harm to the physical health of operators and is low in medium cost and high in economic benefit; international service standards can be completely met by the treated screw taps for the machines, the surface hardness of the screw taps for the machines can reach 61HRC at least, the hardness of cores of the screw taps for the machines can reach 50HRC at least, the toughness of the screw taps for the machines can be improved as compared with conventional heat treatment, the service lives of the screw taps for the machines can be prolonged as compared with the conventional heat treatment, and deformation and cracking of the screw taps for the machines can be greatly reduced.

Description

technical field [0001] The invention relates to a high-carbon steel tool quenching heat treatment process, in particular to a water-air-water quenching heat treatment process for taps used in T10 steel machines. Background technique [0002] In the traditional heat treatment process, some steps use oil for quenching, but there are shortcomings when using oil quenching, because a large amount of oily smoke is generated during quenching, which pollutes the environment, and using oil quenching at the same time will make the workpiece fail to meet the corresponding hardness and use requirements . [0003] If a green quenching heat treatment method is adopted, such as water-air-water quenching process, it can not only ensure that the environment will not be polluted during the production process, protect the health of workers, and at the same time make the structure and mechanical properties of steel meet the requirements and directly generate economic benefits. benefit, it is v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D6/00C21D9/52
Inventor 郑卫刚尹佳成
Owner WUHAN UNIV OF TECH
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