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Correction method of water quenching process under different arrangement densities of shafts

A technology of arrangement density and water quenching, which is applied in the field of quenching and cooling process, can solve the problems of not involving shaft parts and the change of interface heat transfer coefficient, so as to avoid water quenching cracking and reduce product performance fluctuations.

Active Publication Date: 2015-10-28
SHANGHAI JIAO TONG 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 water flow state and water temperature change on the quenching and cooling process caused by changes in the arrangement density of shaft parts, but the water flow state and water temperature change It has a significant impact on the cooling strength of water, that is to say, with the change of water flow state and water temperature, the interface heat transfer coefficient between water and quenched parts also changes significantly. Quenching cracking and reducing product performance fluctuations are of great significance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Water quenching of an alloy steel piece, the size of the alloy steel piece: Ф80*5000 (mm), adopts horizontal heating and horizontal quenching and cooling. The clamping method is: place 8 shafts horizontally, and the distance between the centers of each two shafts is 160mm; place 5 layers up and down, and the distance between the centers of each two layers is 160mm; through tests, it is concluded that the product performance that meets the requirements can be obtained when a single shaft is immersed in water for 240s. It is required to revise the quenching and cooling process under the current clamping method.

[0028] According to the numerical simulation method, the correction coefficient is 1.25, and the calculation formula for the water quenching time after correction is: t 修正 =K*t 标准 According to calculations, the immersion time of this clamping method should be 300s, and the alloy steel parts are cooled by immersion according to this time, so as to obtain product ...

Embodiment 2

[0030] An alloy steel piece is quenched by water-air alternate quenching and cooling process, the quenching medium is water and air, the size of the alloy steel piece: Ф150*5000 (mm), adopts horizontal heating and horizontal quenching and cooling. The clamping method is: place 6 pieces horizontally, and the center distance between each two pieces is 300mm; place 4 layers up and down, and the center distance between every two layers is 300mm. It is required to give the revised water-air alternate quenching and cooling process.

[0031] Methods as below:

[0032] (1) Determine the water-air alternate quenching and cooling process for a single shaft, that is, the first water cooling 120s + air cooling 150s + the second water cooling 180s + air cooling 200s + the third water cooling 150s;

[0033] (2) The revised water quenching time calculation formula: t 修正 =K*t 标准

[0034] In the formula: t 修正 is the corrected water quenching time; K is the correction coefficient; t 标准 is...

Embodiment 3

[0039] A certain alloy steel part is quenched by polymer water-soluble medium. The size of the alloy steel part: Ф80*5000 (mm), adopts vertical heating and vertical quenching cooling. The clamping method is: hoist 20 shafts around the center according to the distance between the centers of every two shafts of 200mm. Through the test, it can be concluded that when a single shaft is immersed in the polymer water-soluble medium for 360s, the required product performance can be obtained. It is required to revise the quenching and cooling process under the current clamping method.

[0040] According to the numerical simulation method, the correction coefficient is 1.20, and the calculation formula for the water quenching time after correction is: t 修正 =K*t 标准 According to the calculation, the immersion time of the clamping method in the polymer-based water-soluble medium should be 432s. According to this time, the alloy steel parts are immersed in the polymer-based water-soluble ...

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Abstract

The invention provides a water quenching process revised method of a shaft under different configuration densities. The method comprises the steps of (1) determining a water quenching process of a single shaft; (2) setting up a water quenching time computational formula after revising; (3) obtaining a revised coefficient through a test method, a numerical simulation method or an experience estimation method; (4) calculating the water quenching time after revising or each section of water quenching time in a water-air alternative quenching cooling process so as to obtain and execute the quenching cooling process after revising; and (5) carrying out property detection and statistics and assessment on the processed product, and adjusting the revising coefficient according to an assessment result. The water quenching process revising method of the shaft under different configuration densities has the important meaning on avoiding of the water quenching cracking and reduction of product property fluctuation.

Description

technical field [0001] The present invention relates to a quenching and cooling process, in particular to a water quenching process correction method for shafts under different arrangement densities. 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. Resea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D11/00C21D9/28
Inventor 陈乃录左训伟戎咏华
Owner SHANGHAI JIAO TONG UNIV
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