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公开(公告)号：US11254993B2
公开(公告)日：2022-02-22
申请号：US15744454
申请日：2016-07-15
申请人： I2C CO., LTD. , Tohoku University
摘要： For the purpose of providing a method of die cast product of spheroidal graphite cast iron and a die cast product of spheroidal graphite cast iron having the number of spherical graphites of 3000/mm2 or more in an as cast state, there is disclosed a method of die cast product of ultrafine spheroidal graphite cast iron, including the steps of: a melting step of heating and melting raw materials made of cast iron to obtain source melting metal; a spheroidizing treatment step in which a spheroidizing treatment is performed; an inoculation step of inoculating; and a casting step of casting in a die mold. The amount of nitrogen is adjusted so that the amount of nitrogen generated in the time of melting becomes 0.9 ppm (mass) or less.
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公开(公告)号：US11845999B2
公开(公告)日：2023-12-19
申请号：US17548542
申请日：2021-12-12
申请人： I2C CO., LTD , TOHOKU UNIVERSITY
发明人： Haruki Itofuji , Masayuki Itamura
IPC分类号： C21C1/10
CPC分类号： C21C1/10
摘要： The present invention provides a die-cast product producing method and a spheroidizing agent of a spherical graphite cast iron with ultrafine spherical graphite by simple method and good reproducibility.
The present invention provides a sand mold producing method and a spheroidizing agent capable of producing an ultrafine spherical graphite cast iron with good reproducibility even in a sand mold thin walled spherical graphite cast iron, which has solidification cooling conditions equivalent to those of a metal mold.
The present invention provides a producing method of a die-cast product of a spherical graphite cast iron using a spheroidizing agent, in which a C amount is 0.5 mass % or more, a total nitrogen amount N is 150 ppm (by mass) or less, and a nitrogen amount generated during melting is 15 ppm (by mass) or less, in a producing method of a sand mold cast product of a thin walled spherical graphite cast iron having a melting process, a spheroidizing process, an inoculation process, and a casting process.-
公开(公告)号：US11745258B2
公开(公告)日：2023-09-05
申请号：US16761807
申请日：2018-04-25
申请人： I2C Co., Ltd , UBE STEEL CO., LTD.
发明人： Haruki Itofuji , Yutaka Miyamoto
CPC分类号： B22D46/00 , C21C1/10 , G01N25/06 , G01N33/205
摘要： A casting solidification analysis method, which can analyze positions of shrinkage cavities more accurately than in the past, a casting method using the above method, and an electronic program are provided. A following casting solidification analysis method is provided. An amount of expansion/shrinkage for each solidification step length separated by inflection points in a cooling curve is determined, by setting a solid phase ratio at a completion of pouring to 0, setting a solid phase ratio at an end of solidification to 1.0, and determining the expansion/shrinkage amount for the each solidification step length by proportionally distributing the each solidification step length to the total solid phase ratio length.
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公开(公告)号：US11920205B2
公开(公告)日：2024-03-05
申请号：US17664429
申请日：2022-05-23
发明人： Masayuki Itamura , Haruki Itofuji , Mitsuru Adachi
摘要： The present invention provides a casting method and cast product of spherical graphite cast iron, in which, even with a small modulus, there is no chill, the spherical graphite in the tissue is further made ultrafine, the dispersion of the particle diameter is small, and the number of the particles is several times that of the conventional one in the as cast state where heat treatment is not carried out. A casting method of a spherical graphite cast iron includes a melting process, a spheroidizing treatment process, an inoculation process, and a casting process, in which the original molten metal after the inoculation process is poured and filled up to a product space through a gate of a metal mold; where the original molten metal is controlled to a semi-solidification temperature range, before being filled up to the product space.
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