Drop hardening: the process of dropping small cups and cones and all rollers directly from the drop hardening furnace into an oil bath which quenches them.

是指将小尺寸的外圈，内圈和所有滚动体直接从熔炉里抛到冷却油中进行淬火的工艺过程。

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The paper discussed the rebuilding process of oil pit type furnace and the effect of saving energy after it had been rebuilded.

本文论述了燃油多罐井式炉的改造过程及改造后取得的节能效果。

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To introduce the structure and atmosphere control system of oil burning open fire furnace. The effect of atmosphere in the furnace on heat treatment process is analyzed.

介绍明火燃气加热炉的结构及炉内气氛控制系统，分析炉内气氛对钢丝热处理工艺的影响。

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