Gas-cooled single chamber heat treating furnace, and method for gas cooling in the furnace
AssigneeChugai Ro Co., Ltd.
InventorKinya Kisoda
Life of this patent
Estimating the term…
Abstract
A gas-cooled single-chamber type heat-treating furnace T in which cooling gas vents 9A and 9B opened and closed by doors 11A and 11B are provided on each of mutually opposed walls of an inner chamber 5 forming a processing room and cooling gas is circulated by opening the cooling gas vents 9A and 9B during gas cooling, wherein the cooling gas vents 9A and 9B of the inner chamber 5 are provided with lattice-shaped flow uniforming members 19 made of heat-resisting materials.
Claims6
A gas-cooled single-chamber heat-treating furnace, comprising:
- cooling gas vents opened and closed by doors provided on each of mutually opposed walls of an inner chamber forming a processing room;
- a first circulating fan located outside one end portion of the inner chamber, and a second circulating fan being located inside an opposite end portion of the inner chamber, the end portions being substantially orthogonal to the cooling gas vents provided in the mutually opposed walls;
- and
- cooling gas being circulated by the first circulating fan by opening the cooling gas vents during gas cooling,
- wherein the cooling gas vents of the inner chamber are provided with lattice-shaped flow uniforming members made of heat-resisting materials.
A gas cooling method in a gas-cooled single-chamber type heat-treating furnace in which a metallic material heated to a hardening temperature is cooled in a furnace atmosphere by forced convection, the method comprising the steps of:
- controlling a number of revolutions of the drive motor of a circulating fan for cooling or a circulating blower based on a difference between a preset cooling curve and an atmosphere temperature in the furnace or a metallic material temperature in the furnace obtained by comparing the atmosphere temperature or the metallic material temperature with the preset cooling curve;
- and
- keeping the drive motor running at its critic output even if a load increases due to a temperature change when an output of the drive motor reaches the critical output.
Dependencies are inferred from the claim text.