HEATING FURNACE AND ITS CONTROL METHOD

Japanese Patent JP2010014314

A

To provide a heating furnace capable of reducing the amount of decarbonization of a workpiece, and its control method.

The heating furnace has a hearth 3, a furnace body 2 in which an opening 2b closed by the hearth 3 is formed at a lower part, and a hollow part 2a is formed in communication with the opening 2b, and a lifting means for lifting the hearth. A control means is provided for heating the hollow part 2a to 900C or higher and controlling the lifting means so that an aspect ratio x of the hollow part 2a satisfies 0.5x3.0, and the opening/closing speed v(mm/s) of the opening 2b with the hearth 3 satisfies 5v50.

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ISHIMORI YASUHIRO
OKITA SHIGERU

JP2008173764A

January 21, 2010

July 02, 2008

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NSK LTD

F27B3/28; C21D11/00; F27B3/06; F27D3/12; F27D7/06; F27D19/00

Tetsuya Mori
Yoshiaki Naito
Cui Shu Tetsu

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