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  •  當前位置:精細淬火冷卻技術 >> 淬火冷卻中工件的正放與斜放
    淬火冷卻中工件的正放與斜放
    (北京華立精細化工公司 北京昌平 102200)
    發表于《熱處理技術與裝備》2009年第1、2期
    摘要:攝像記錄了多種試樣以正放和不同的斜放方式在油中淬火的冷卻過程。研究對比了不同放置方式下試樣冷卻的快慢和冷卻的均勻性。結果表明,和試樣正放相比,試樣斜放冷卻得既快而又均勻。冷卻過程中,在水平向下的表面上觀測到倒立的氣體堆。倒立氣體堆的存在極大地減慢了所在表面的冷卻速度,在工件上造成了很大的溫度差。推測了倒立氣體堆的形成機理和演變過程。提出了防止出現倒立氣體堆的方法。蒸汽膜內氣體的流動規律和中間階段特性是引起上述現象和差異的原因。它們對試樣淬火冷卻效果的影響可歸結成兩類:一是在工件上造成了顯著的相對厚度差,二是使形狀對稱的工件得不到具有相似對稱關系的冷卻效果。
    How to Place Your Workpiece during oil Quenching
    (Beijing Huali Fine Chemical Co. , Beijing 102200, China)
    Abstract: The oil quenching process of different workpieces placed in straight way and other various inclined ways were videoed. This study compared the cooling rate and evenness of the workpieces under different placement ways. The results show that compared with straight sample, inclined sample can be cooled down faster and evenly. During the cooling process, an upside-down heap of gas is observed at the downwards-facing horizontal surface. The existence of the upside-down heap of gas greatly decreased the cooling rate of the downwards-facing horizontal surface, thus led to a great difference in temperature between different areas of the workpiece. This study also presumed the formation mechanism and evolution process of the upside-down heap of gas, and a method for preventing the emergence of it is put forward. The flowing rule of gas inside the vapor blanket and the middle stage properties are the reasons for the above mentioned phenomena and differences. The cooling effect of all above tests revealed two characteristics: (1) significant relative differences in thickness occurred between different parts of a workpiece; and (2) symmetrically shaped workpiece can not receive corresponding symmetrical cooling effect.



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