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淬火冷却过程控制中的新认识与新技术
(北京华立精细化工公司,北京 102200)
发表于《金属热处理》2010年第10期
摘要:列举了行业内关于油与水性介质中淬火冷却方面的8种错误认识和错误做法。简单介绍了四阶段理论和蒸气膜内气体的流动规律及其对工件冷却快慢与冷却均匀性的影响。然后,介绍了用这些新知识开发出的10项可用于控制淬火冷却过程的新技术和新认识。它们是:1.交界线借用技术;2.超前扩展点的诱导技术;3.倒立气体堆;4.工件正放与斜放的不同冷却效果;5.阻止交界线扩展的隔离堤技术;6.表面冷却过程的五种图线表述方法;7.外形对称的工件得不到具有相似对称关系的淬火冷却效果;8.两种蒸气膜厚度测试方法和测试结果的对比;9.淬火介质的冷却特性曲线不是探棒表面的冷却信息;10. 应当向用户提供介质的哪些冷却特性信息。
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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