METHOD FOR PARTIAL NITRIDING AND QUENCHING AND PARTIAL CARBURIZING AND QUENCHING FOR PARTS

摘要

PURPOSE: To execute partial nitriding and quenching or partial carburizing and quenching only to a desired part without using a nitriding preventing agent or a carburizing preventing agent. ;CONSTITUTION: The figure is a one in which the edge part of a drilling tapping screw 1 is subjected to partial nitriding and quenching. A holding plate 3 fitted to the lower part of a vessel 4 is provided with a hole in which a screw 1 can be inserted, and the screw 1 is hung down to this hole. The lower part of the screw 1 is immersed in a treating soln. 2 and is subjected to nitriding treatment. Compressed air is introduced into the vessel 4 via a regulator 6 for regulating inflow pressure from a gas inflow pipe 5, flows out from the space between the hole of the holding plate 3 and the screw 1 and covers the part over the treating soln. 2, so that a nitrided film can be formed only on the surface of the immersed part without nitriding caused by a gas generated from the liq. face of the treating soln. 2 or the like.;COPYRIGHT: (C)1993,JPO&Japio