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。
By measuring the cooling curve and quench severity of quenching oil at various flow rates, the relationship among the hardening capacity, quench severity and flow rate was established.
对淬火油在不同流速下的冷却曲线和淬火烈度进行了测量，建立了硬化能力、淬火烈度与介质流速三者之间的关系。
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