Method for cooling metal parts having undergone a nitriding/nitrocarburising treatment in a molten salt bath, unit for implementing said method and the treated metal parts
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United States of America Patent
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Oct 11, 2016
Grant Date -
Aug 7, 2014
app pub date -
Jul 12, 2012
filing date -
Jul 15, 2011
priority date (Note) -
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Abstract
Before the end of the treatment of metal parts in a molten salt bath nitriding/nitrocarburizing station, a chamber, arranged so that the oxygen contained in the chamber can be discharged in order to create an inert atmosphere, is filled with a refrigerant in liquid form and with a strong capacity for volume expansion as it evaporates. All the parts treated are transferred into the chamber. The chamber is closed, and the parts are left in the chamber for a preset length of time to reach a temperature at which the salt congeals and forms a protective barrier. The parts are then removed and subjected to a rinsing operation.
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