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  •  當前位置:精細淬火冷卻技術 >> 淬火冷卻過程控制中的新認識與新技術
    淬火冷卻過程控制中的新認識與新技術
    (北京華立精細化工公司,北京 102200)
    發表于《金屬熱處理》2010年第10期
    摘要:列舉了行業內關于油與水性介質中淬火冷卻方面的8種錯誤認識和錯誤做法。簡單介紹了四階段理論和蒸氣膜內氣體的流動規律及其對工件冷卻快慢與冷卻均勻性的影響。然后,介紹了用這些新知識開發出的10項可用于控制淬火冷卻過程的新技術和新認識。它們是:1.交界線借用技術;2.超前擴展點的誘導技術;3.倒立氣體堆;4.工件正放與斜放的不同冷卻效果;5.阻止交界線擴展的隔離堤技術;6.表面冷卻過程的五種圖線表述方法;7.外形對稱的工件得不到具有相似對稱關系的淬火冷卻效果;8.兩種蒸氣膜厚度測試方法和測試結果的對比;9.淬火介質的冷卻特性曲線不是探棒表面的冷卻信息;10. 應當向用戶提供介質的哪些冷卻特性信息。
    New Cognitions & Techniques about Control of Quenching Cooling Process
    (Beijing Huali Fine Chemical Co., Beijing 102200, China)
    Abstract: Firstly, eight wrong ideas as well as some improper methods in the field of quenching when using quenchants like oil or water are presented here. Then the four-stage theory, the law of gas flow in vapor blanket and their influence upon the cooling rate and evenness of work pieces are discussed. Afterwards, new techniques and cognitions developed from the studies above to be used in the process of quenching cooling are presented as follows: 1.The technique of borrowing of demarcation line; 2. the induction of the hyper-spreading spot; 3.Upside down heap of gas; 4. Different cooling effects for work piece placed in a straight way or in an oblique way; 5. The technique of isolation dike to stop demarcation line spreading; 6. Five methodologies of sketches or curves of surface cooling process; 7. No similar symmetrical quenching cooling effects can be attained for work pieces with symmetrical forms; 8. Comparison between two measure methods for the thickness of vapor blanket and their results; 9. Cooling curves of quenching media are not the cooling information of the surface of the test probe; and 10. What cooling information about quenching media should be presented to users.



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