Ntn Corporation

Tadayoshi Yoshioka

Masanori Ichikawa

Taichiro Furukawa

Yukio Hashimoto

Shingo Mizoguchi

Shinichi Takizawa

Katsumasa Toyoda

A carburization and quenching apparatus includes: a plurality of carburizing chambers for carburizing thin plate parts; a gas cooling chamber for cooling the thin plate parts carburized in the carburizing chambers; and a reservoir tank 3 connected to the gas cooling chamber for delivering a cooling gas into the gas cooling chamber. The plurality of carburizing chambers are positioned at an approximately equal distance from the gas cooling chamber to surround the gas cooling chamber. In a continuous furnace, thin plate parts can be transported successively at least between a carburizing chamber and a pressurized cooling chamber. The thin plate parts are carburized in the carburizing chamber and then rapidly quenched in the pressurized cooling chamber by cooling the thin plate parts with a pressurized gas which can be e.g. inert gas.

Carburization and quenching apparatus

A process for hardening a plurality of holed flat parts. The holed flat parts are heated by inserting a cantilever hanger into the holes of the holed flat parts to support them in vertical positions within a furnace. The holed flat parts are then removed from the hanger by inserting a moving fork into the holes of the holed flat parts and moved to a cooling section while being supported in the vertical positions on the moving fork. Then, the holed flat parts in the vertical positions are quenched in the cooling section by blowing a gas downward to them. Also disclosed is an apparatus for practicing the holed flat part hardening process. The apparatus comprises: a continuous furnace; a plurality of stands arranged in the continuous furnace and each having a cantilever hanger; a loader including a moving fork for hanging the holed flat parts on the hanger; an extractor including a moving fork for extracting the holed flat parts from the hanger; and a cooling section for blowing a gas downward to the holed flat parts supported by the moving fork of the extractor, to quench the holed flat parts.

Hardening process and apparatus for holed flat parts

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Shizuoka, Japan

Tadayoshi Yoshioka