Specialized metallurgical processes – compositions for use therei – Processes – Producing solid particulate free metal directly from liquid...
Patent
1995-11-03
1997-08-05
Wyszomierski, George
Specialized metallurgical processes, compositions for use therei
Processes
Producing solid particulate free metal directly from liquid...
75342, 75370, B22F 100
Patent
active
056537832
ABSTRACT:
A method for efficiently and accurately manufacturing fine metal balls such as solder is provided. A liquid is poured into a vertically elongated cylindrical container, where the liquid is heated up to a temperature higher than the melting point of the metal from its top to middle regions and maintained at a temperature lower than the melting point in the lower region. Metal pieces each of which is made to have a predetermined volume are dropped into the container. The metal pieces are heated and melted while passing the high-temperature region, and take the shape of a substantial sphere due to their own surface tension. However, when the balls reach the low-temperature region, they are cooled and solidified to become substantially perfect metal balls. Since this process can be successively performed, a large number of fine low-melting-point metal balls with high dimensional accuracy can be efficiently manufactured by combining the process with a wire cutter with a high accuracy.
REFERENCES:
patent: 2952868 (1960-09-01), Rowan
patent: 3063099 (1962-11-01), Turner et al.
patent: 4842654 (1989-06-01), Shindo et al.
Nippon Steel Corporation
Wyszomierski George
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