| 摘要 |
PURPOSE:To reduce considerably a total treatment time and to improve the durability of the furnace material in a heating chamber, by using a high-frequency heating means in place of a graphite heater as a heating means for a high-temp. carburization device. CONSTITUTION:An inlet door 4 is opened and the material 2 placed on a tray 1 is charged as it is into a charging chamber 3, then the door 4 is closed. Thereupon, the pressures in the chamber 3 and a heating chamber 6 are reduced and maintained to and at about 1Torr. On the other hand, the pressure in a cooling chamber 14 is reduced and maintained to and at 1-300Torr with a vacuum pump 20. An intermediate door 8 is then opened, and the material 2 is conveyed from the chamber 3 to the chamber 6, the door 8 is closed, and the material 2 is moved up to the prescribed position in a high-frequency heating coil 10 and is set therein. A high-frequency output is applied from an oscillator 12 to the coil 10, and only the required part of the material 2 is quickly heated up to a required temp. Gaseous hydrocarbon is fed into the chambers 6, 14. The material 2 is brought down to the home position after a required time, then the door 16 is opened and the material 2 is conveyed from the chamber 6 into a chamber 14. |
