| 摘要 |
PURPOSE:To simplify stages and to imrpove working efficiency and productivity by subjecting ferrous members simultaneously to high frequency brazing and high frequency carburizing. CONSTITUTION:Articles 5 to be treated of cylindrical and disc shapes consisting of low carbon steel placed with a steel brazing filler metal 5' therebetween are placed on a receiving jig 4 for the articles to be treated in the furnace chamber 2 of a high frequency heating chamber 1. Gaseous nitrogen added with 0.5-30% gaseous hydrocarbon is fed through a feed port 6 into the chamber 2 and the articles 5, then the jig 4 is rotated. On the other hand, high frequency outputs are applied to a high frequency coil 3 to heat the articles to 1,100- 1,150 deg.C brazing and carburizing temps. Said temps. are held for 3-15 minutes to effect brazing of the articles 5 and cementation and diffusion of carbon into the surface layers thereof simultaneously. After the articles are slowly cooled from the carburizing temp. down to 850-800 deg.C hardening temp., the articles are immersed in a cooling medium 11 held at 60 deg.C in a hardening tank. |
