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  •  當前位置:精細淬火冷卻技術 >> 決定淬火工件表面冷卻快慢的兩個新因素
    決定淬火工件表面冷卻快慢的兩個新因素
    (北京華立精細化工公司,北京 102200,中國)
    Two New Factors Determining the Cooling Rate of Work Piece Surface during Quenching
    Beijing Huali Fine Chemical Co. Ltd., Beijing 102200, China
    發表于《熱處理》2014年第6期
    摘要:用標準探棒檢測出的油或者水的冷卻速度曲線既不能反映探棒表面的冷卻情況,也不能用來推測工件表面的冷卻過程。要了解工件表面的冷卻情況,須對工件的冷卻過程做直接觀測。匯總多項直接觀測和研究結果后發現,除了淬火介質的冷卻能力和所在局部的有效厚度這兩項因素之外,在不同表面的蒸汽膜內氣體的流動情況和表面從蒸汽膜向沸騰冷卻方式轉型的先后次序,對試樣表面冷卻的快慢和整個工件冷卻的均勻性都會產生巨大影響。揭示了后兩類因素影響工件冷卻快慢和冷卻均勻性的基本規律。利用這兩類新因素的作用規律,可以在淬火冷卻過程中對同一工件上不同表面部分的冷卻快慢分別加以控制。把這類控制技術稱為精細淬火冷卻技術。
    Abstract: The temperature cooling rate curves of oil and water detected by a standard probe can neither reflect the cooling status of the probe surface nor can they be used to make deductions about the cooling process of the work piece surface. In order to gain information about the cooling status of a work piece surface, the cooling process of the sample should be observed directly. By studying and summarizing several observation results, it is found that apart from two factors (the cooling capability of the quenching medium and the effective thickness of a certain surface point), the gas flow within the vapor blankets of different surfaces and the sequence of transfer from vapor blanket stage to boiling stage could both greatly influence the cooling rate of a given surface point and then the cooling uniformity of the whole work piece. The effect mechanisms of the two new factors on the cooling rate and uniformity of the work piece is investigated in this paper. According to the effect law of the new factors, the cooling rates of different parts of the work piece surface can be controlled separately in the quenching process. This kind of control technique is called fine quenching technology.

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