FREE FALL TYPE HEAT TREATMENT METHOD AND HEAT TREATMENT FURNACE

摘要

PROBLEM TO BE SOLVED: To heat-treat a treated material in the form of a powder fluid or scale by heating it evenly up to a necessary temperature in a quick and fixed time. SOLUTION: A free fall type heat treatment furnace has a treated material charging part 4 for storing and feeding a treated material, a treated material discharging part 8 for dropping a fixed amount of the treated material per hour in a vacuum from the treated material charging part 4, a temperature raising part 9 for heating from the periphery the falling treated material as the treated material falling from the treated material discharging part 8 falls in the vacuum, a temperature holding part 17 for feeding the treated material heated in the temperature raising part 9 to heat it for a necessary time and maintain the temperature, and a cooling part 20 for cooling the treated material fed from the temperature holding part 17.