Casting mold, and production method thereof
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United States of America Patent
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Nov 17, 2020
Grant Date -
Jul 26, 2018
app pub date -
Jan 24, 2018
filing date -
Jan 25, 2017
priority date (Note) -
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Abstract
A casting mold and a production method thereof with which exfoliation of coating is controlled and liquidity of molten metal can be maintained are provided. This casting mold 1 includes a surface processing part 3 in which a plurality of groove parts 5 of a grid groove 4 formed in a surface of a molten metal contact part of a mold material 2 is coated with a carbon film 6. In this surface processing part 3, a width W1 of the groove parts 5 is 35 μm or narrower, skewness Ssk of three-dimensional surface roughness is in a range of −0.8 to −0.2, and indentation hardness of the carbon film 6 tested by a nanoindenter is 1000 N/mm2 or higher. With this arrangement, it is possible to optimize the surface processing part 3 in such a manner that a penetration rate of the molten metal (aluminum 10) is controlled to be low and the coating (carbon film 6) is unlikely to exfoliate from the groove parts 5.
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