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由木材、树脂、石膏或耐热性树脂材料制作成下模1,并将低熔点合金浇注在下模1中,制成与下靠模相应形状的上靠模M,并在M内部埋设冷却水管2。通过调节楔形压扳4,将上靠模M固定在底座3上,其表面由高熔点硬质金属和插数根钢丝针5构成。紧接着,一边使带刺的上靠模M冷却,一边喷镀与钢丝针5相同的或同种类型的硬质金属,在上面形成硬质金属层6。再将硅砂固定在该硬质金属层6的上面,形
The lower mold 1 is made of wood, resin, gypsum or heat-resistant resin material, and the low-melting alloy is poured into the lower mold 1 to form the upper mold M corresponding to the lower mold and the cooling water pipe 2. By adjusting the wedge-shaped pressure plate 4, the upper mold M is fixed on the base 3, and the surface thereof is composed of a high-melting-point hard metal and a plurality of steel wire needles 5. Next, the hard metal having the same type or the same type as that of the steel wire needle 5 is thermally sprayed while cooling the upper stamped upper mold M, and the hard metal layer 6 is formed thereon. Then the silica sand is fixed on the hard metal layer 6, shaped