| 摘要 |
PROBLEM TO BE SOLVED: To provide a sand core for casting which can obtain a cast product excellent in a dimensional precision and also, easily separates from the cast product and easily collapses, and its manufacturing method. SOLUTION: This sand core 10 has three-layer structures laminated with a first coating layer 14 on the surface of a core body 12 and a second coating layer 16 in this order. In these layers, a part in the first coating layer 14 containing large grain diameter zircon flower, small grain diameter zircon flower and phenolic resin is embedded into the core body 12. Further, in the second coating layer 16 coating this first coating layer 14, mica is contained as a lubrication-giving agent. Then, the core body 12 is constituted by combining 'Thera Beads' (an artificial sand) grain with the phenolic resin. COPYRIGHT: (C)2003,JPO
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