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Patent Searching and Data


Title:
METHOD FOR PREVENTING QUENCHING CRACK
Document Type and Number:
Japanese Patent JPS6223925
Kind Code:
A
Abstract:

PURPOSE: To effectively prevent the quenching crack and overhardening of a product of a material in which the quenching crack is readily caused by filling molding sand for a CO2 process into a part of the product in which the quenching crack is probably caused and by quenching the product.

CONSTITUTION: When the product of a material in which the quenching crack is readily caused is quenched, the molding sand for a CO2 process consisting of about 100pts.wt. silica sand and about 7pts.wt. water glass is filled into a part of the product in which the quenching crack is probably caused or a part not to be overhardened. The part may be coated with the molding sand. After the molding sand is solidified by blowing gaseous CO2, the product is water-quenched. Thus, the quenching crack and overhardening of the product are provented.


Inventors:
WADA AKIO
Application Number:
JP1985000162866
Publication Date:
January 31, 1987
Filing Date:
July 25, 1985
Export Citation:
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Assignee:
MITSUBISHI HEAVY IND LTD
International Classes:
C21D1/18; C21D1/70; (IPC1-7): C21D1/18