METHOD FOR PREPARATORILY BAKING HOLDER AND APPARATUS FOR DETERMINING COMPLETION OF PREPARATORY BAKING

摘要

PROBLEM TO BE SOLVED: To provide a method for preparatorily baking a holder, which can give a stable nitriding potential and a nitriding quality to a workpiece in the first heat treatment of the workpiece without performing a complicated preparation work, when heat-treating the workpiece in a heat treatment furnace into which ammonia gas is supplied, and to provide an apparatus for determining the completion of preparatory baking.

SOLUTION: The method for preparatorily baking the holder 22 which is used when the workpiece 21 to be heat-treated in the heat treatment furnace 2 into which the ammonia gas is supplied is placed in the heat treatment furnace 2 includes: preparatorily baking the holder 22 which is mounted in the heat treatment furnace 2 before heat-treating the workpiece 21; measuring a concentration of remaining ammonia in an atmospheric gas in the heat treatment furnace 2 which is preparatorily baking the holder; and determining the completion of the preparatory baking of the holder 22 based on a value of the measured concentration of the remaining ammonia.

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