A new centrifugal casting process which can manufacture hollow metal spheres in one step was developed. Hollow spheres with 70 mm O.D. and approximately 3 mm thickness were cast with Sn alloys and Al alloys. Process parameters, such as pouring temperature, rotation rate, the ratio of two axial rotation rates were optimized experimentally. In case of pure Sn and Sn-Cu eutectic alloy, good results were obtained with melt superheat of 120 deg C, rotation rate of 500 rpm and the rotation ratio of 0.9:1. In case of Al alloys, the alloy solidifying in mushy type could hardly be formed directly in metallic mold, while it was possible in sand mold. The wall thickness of the sphere can be varied by changing the pouring amount.
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机译：开发了一种新的离心铸造方法，可以在一步中制造空心金属球。带有70 mm O.D的空心球体。用Sn合金和Al合金铸造约3mm厚度。工艺参数，例如浇注温度，旋转速率，实验优化了两个轴向旋转速率的比例。在纯Sn和Sn-Cu共晶合金的情况下，用120℃的熔体过热，旋转速率为500rpm，旋转比为0.9：1，得到良好的结果。在Al合金的情况下，用糊状型固化的合金可以直接在金属模具中直接形成，而在砂模中可以。球体的壁厚可以通过改变浇注量而变化。
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