MANUFACTURE OF HOT WORKING DIE

Japanese Patent JP3911750

B2

PROBLEM TO BE SOLVED: To obtain the long life of working die having high toughness and low strain by heating the die stock worked a hot die steel at the quenching temperature, throwing it into coolant to quench, drawing it up from coolant before reaching the martensitic transformation point and cooling it up to the ordinary temperature under the condition that strain is straightened.
SOLUTION: The stock 1B strained by heating or cooling is obtained in the case of manufacturing the stock 1A applied die sinking. Although the most direct method for straightening the strain like thin is to apply a mechanical stress to the die stock under air cooling, another method is to apply a thermal stress, about a cooling metal to the strained stack 1B and quickly cool the extended side. For example, the heating temperature of 1000-1050°C at the time of quenching, typically the central temperature of 1030°C is preferably for SKD 61 steel as the temperature condition, and air cooling after throwing it into coolant is preferably executed when the surface temperature of the strained stock 1B is within the range of +200°C to -100°C to the martensitic transformation point. By this way, the generation of cracks is prevented.

WO/2002/092251	TUBE CORRUGATING APPARATUS AND METHOD
JP2848701	INDUSTRIAL APPLICABILITY: Tension molding method and apparatus

Takehiro Oki
Tamaki Yanagisawa
Hayashi Kiyohide
Ishikawa Sakaichi

JP1059697A

May 09, 2007

January 23, 1997

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Daido Steel Co., Ltd.
Daido Amister Co., Ltd.

B21D3/00; B21D37/20; C21D9/00; C22C38/00; C22C38/24; C22C38/46; (IPC1-7): B21D37/20; B21D3/00; C21D9/00; C22C38/00; C22C38/24; C22C38/46

JP6322444A
JP60149716A
JP52104456A

Sooo Suga

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