To provide a vacuum carburizing furnace by which, even if vacuum carburizing is performed at a high temperature of about 1,050°C, at the time of exhausting atmospheric gas from a heating chamber under the carburizing, failures, e.g., that an exhaust pipe is clogged with graphite, soot or tar, or a flow rate control valve in an exhaust passage is clogged with tar so as to be made impossible of controlling are not caused, and which can be continuously operated over a long period.
In the vacuum carburizing furnace, a gas introduction pipe 5 for introducing gas for vacuum carburizing into a heating furnace 1 is opened at the bottom part of the heating chamber 1, further, piping 3a for exhausting atmospheric gas in the heating chamber 1 is opened at the ceiling part of the heating chamber 1, and also, a cooling means 4 for cooling the piping 3a at the outside of the furnace is provided. Thus, the vacuum carburizing furnace promptly passes the gas in the exhaust pipe 3a in the temperature range of 300 to 800°C at which tar is easy to be generated so as to suppress the generation of tar.
HASHIMOTO HIROYUKI
KO ZAIGAKU
| JPS62270761A | 1987-11-25 | |||
| JPS63175154U | 1988-11-14 | |||
| JP2001240954A | 2001-09-04 | |||
| JP2003119558A | 2003-04-23 | |||
| JPS5354135A | 1978-05-17 | |||
| JPH01180957A | 1989-07-18 | |||
| JPH06193761A | 1994-07-15 |
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