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Correction method of water quenching time under different initial water temperature

A technology of time correction and temperature correction coefficient, which is applied in the field of quenching and cooling technology, can solve problems such as not involving water quenching, and achieve the effect of avoiding water quenching cracking and reducing product performance fluctuations

Active Publication Date: 2016-06-01
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technology in this document has obvious effects on avoiding cracking of alloy steel parts. However, this document does not involve the influence of the initial water temperature of water quenching on the water quenching time, and the initial water temperature has a significant impact on the cooling strength of water. Considering the factor of initial water temperature It is of great significance to avoid water quenching cracking of alloy steel and reduce product performance fluctuations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Water quenching of an alloy steel piece, through experiments, it is concluded that when the water temperature is 20°C and the immersion time is 240s, the required product performance can be obtained; now the water temperature is 30°C, in order to ensure that the alloy steel piece is quenched at a water temperature of 30°C to obtain The same performance as 20℃ water temperature quenching, need to adjust the immersion time.

[0028] The temperature correction coefficient obtained by the cooling characteristic curve method is 1.10, then the calculation formula for the corrected water quenching time is: t 修正 =K*t 标准 According to the calculation, when the water temperature is 30°C, the immersion time should be 264s; according to this time, the alloy steel parts are cooled by immersion in water, and the product performance is similar to that of the water temperature of 20°C and the immersion time of 240s.

Embodiment 2

[0030] An alloy steel part is quenched by water-air alternate quenching and cooling process. When the water temperature is 20°C, the process is: water cooling 120s + air cooling 150s + water cooling 180s + air cooling 200s + water cooling 150s. It is required to give the process when the water temperature is 15°C.

[0031] The temperature correction coefficient obtained by the heat transfer coefficient method is 0.95, then the formula for calculating the water quenching time after correction is: t 修正 =K*t 标准 According to the calculation, when the water temperature is 15°C, the process is: water cooling 114s + air cooling 150s + water cooling 171s + air cooling 200s + water cooling 143s; according to this process, the alloy steel parts are quenched and cooled, and the product performance is similar to that of the water temperature of 20°C.

Embodiment 3

[0033] An alloy steel part is quenched with a polymer water-soluble medium. Through experiments, it is concluded that: when the medium temperature is 20°C and the immersion time is 320s, the required product performance can be obtained; now the medium temperature is 40°C, in order to ensure that the alloy steel Quenching the parts at a medium temperature of 40°C can obtain the same performance as quenching at a medium temperature of 20°C, and the immersion time needs to be adjusted.

[0034] The temperature correction coefficient obtained by the empirical estimation method is 1.25, then the formula for calculating the quenching time after correction is: t 修正 =K*t 标准 According to the calculation, when the medium temperature is 40°C, the immersion time should be 400s; according to this time, the alloy steel parts are cooled by immersion, that is, the performance of the product is similar to that of the medium temperature of 20°C when the immersion time is 320s.

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Abstract

The invention provides a water quenching time correction method at different initial water temperatures. The method comprises the following concrete steps: (1) determining a water quenching technology or a water-air alternative quenching technology at a standard temperature; (2) determining a correction coefficient of the water quenching time, wherein the correction coefficient changes along with a change of the initial water temperature; (3) calculating the corrected water quenching time according to the formula, t[correction]=K*t[standard]; (4) executing quenching process according to the corrected technology; (5) carrying out performance detection and statistical estimation on the product processed according to the corrected quenching technology, and then correcting the temperature correction coefficient according to the estimation result. The water quenching time correction method at different initial water temperatures disclosed by the invention has important significance on avoidance of water quenching cracking and reduction of product performance fluctuation.

Description

technical field [0001] The invention relates to a quenching and cooling process, in particular to a method for correcting water quenching time at different initial water temperatures. Background technique [0002] Quenching is the process of heating the quenched piece to the austenite temperature and then rapidly cooling it below a certain temperature to obtain a martensite or bainite structure. In order to avoid quenching cracks, alloy steel is generally quenched by oil, and water quenching is rarely used. Alloy steel water quenching generally adopts batch quenching or water-air alternate quenching to avoid cracking. Therefore, the key to water quenching of alloy steel is to control the time of water quenching and air cooling, that is, to accurately implement the water-air alternate time-controlled quenching and cooling process. [0003] After searching the existing technical literature, it was found that Chen Nailu, Zuo Xunwei, Xu Jun, Zhang Weimin. Research and applicat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D11/00C21D1/18
Inventor 陈乃录左训伟戎咏华
Owner SHANGHAI JIAOTONG UNIV
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