Different quenching weight water-air alternative quenching process correction method

Abstract

The invention provides a different quenching weight water-air alternative quenching process correction method, which includes: (1) establishing a database containing the total water, the quenching piece weight, the quenching piece temperature drop range, and the total water-cooling time that are involved in quenching cooling; (2) calculating the total release of heat according to the quenching piece weight and the temperature drop range, and calculating the water temperature rise rate per unit time according to the total water and the total water-cooling time data involved in quenching cooling; (3) determining a water-air alternative quenching cooling process under a standard water temperature; (4) determining the temperature correction coefficients of each water quenching period in the water-air alternative quenching cooling process under different water temperatures; (5) calculating a corrected water quenching time according to a formula; (6) generating and carrying out the corrected water-air alternative quenching cooling process; and (7) performing performance detection and statistical evaluation on the treated product, and adjusting the temperature correction coefficients according to the evaluation result. The method provided in the invention is of important significance in avoiding water quenching cracking and reducing product performance fluctuation.

Description

technical field [0001] The invention relates to a quenching and cooling process, in particular to a correction method for water-air alternate quenching process with different quenching weights. 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 an...

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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 temperature changes caused by quenching weight changes on the quenching cooling process, and water temperature changes have a significant impact on the cooling strength of water, that is to say As the water temperature changes, the interface heat transfer coefficient between water and quenched parts also changes significantly. Considering the water temperature change is of great significance to avoid water quenching cracking and reduce product performance fluctuations.