HOT AIR CIRCULATION FURNACE

摘要

[Problem] To provide a hot air circulation furnace for reducing nonuniformity in a heat treatment temperature, the hot air circulation furnace being capable of temperature control based on a set temperature profile. [Solution] A hot air circulation furnace (10) comprises a circulation passage (14) for circulating gas in a furnace chamber (12A) in one direction, an air blower (16) for circulating the gas within the circulation passage (14), a heat source (18) for heating the gas, and a heat treatment chamber (20) for accommodating a heat-treated object. The heat-treated object is provided so as to be capable of rotating horizontally around an axis positioned in the center of the heat treatment chamber (20), gas inlets (24a) are provided in one side of the heat treatment chamber (20), gas outlets (24b) are provided in the other side, and the air blower (16) is provided in proximity to the outlets (24b) of the heat treatment chamber (20) such that the gas flows in one direction from the inlets (24a) to the outlets (24b) and such that an intake duct (16a) of the air blower (16) linearly faces the outlets (24b) of the heat treatment chamber (20). A temperature detector (22) for the circulating gas is provided to an outlet of the heat treatment chamber (20).