发明名称 |
Process for forming shell molds |
摘要 |
A pattern holder 12 and a sand tank 14 are rotatably mounted on a frame 16 so that the pattern holder can be inverted over and sealably mounted atop the sand tank. A vented pattern 26 is secured to the pattern holder and forms a first chamber between one side of the pattern and the interior of the pattern holder. A second chamber 90 is formed between the other side of the pattern and the interior of the sand tank when the pattern holder adjoins the sand tank. O-ring seals 32 and 80 isolate the chambers from the atmosphere so that a partial vacuum can be formed therein. A mixture 84 of sand and a gas-curable binder is provided in the sand tank so that the mixture will fall onto the pattern upon inverting the sand tank over the pattern holder. A flexible line 42 is provided for controllably introducing a gas catalyst into the chamber 38 in order to cure a portion of the sand-binder mixture to form a shell mold 94 of a predetermined thickness on a pattern face 36 of the pattern. Flexible lines 41 and 43 are provided for evacuating and purging the chamber 38 at different stages in the process.
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申请公布号 |
US4312397(A) |
申请公布日期 |
1982.01.26 |
申请号 |
US19800140296 |
申请日期 |
1980.04.14 |
申请人 |
DEPENDABLE-FORDATH, INC. |
发明人 |
HARRIS, DAVID L.;TAYLOR, COLIN |
分类号 |
B22C9/12;B22C13/08;(IPC1-7):B22C9/12 |
主分类号 |
B22C9/12 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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