| 摘要 |
PURPOSE:To easily manufacture a sheet type grind stone with high abrasive grain retaining force and high mechanical strength in large quantities by primarily sintering a mixture of cast iron powder, carbonyl-powder, and abrasive grains to form into a material for sheet and, after rolling, regularly sintering said material. CONSTITUTION:A mixture of cast iron powder 1, abrasive grains 2, and carbonyl powder 3 is primarily sintered and formed into a material for sheet having a flexual strength of 0.15kg/mm.<2> or more. In this case, a kind of bridge structure formed with weakly combined independent grains is formed between the cast iron powder 1 and the carbonyl powder 3, and the abrasive grain 2 is surrounded between the gap of this structure. Then, this material 6 for sheet is rolled and molded and, after a distance between the cast iron grain 1 and the carbonyl grain 3 is reduced, a secondary sintering (regular sintering) is carried out to provide a sufficient reaction between the cast iron grain 1, carbonyl grain 3, and a graphite grain, which have approached each other, thereby, forming a solid, unseparable cast iron structure around the abrasive grain 2, to obtain a sheet type grind stone having high abrasive grain retaining force and high mechanical strength.
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