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Method for the manufacture of molds using casting sand or another mixture of raw material particles

  • US 4,546,810 A
  • Filed: 08/11/1983
  • Issued: 10/15/1985
  • Est. Priority Date: 12/11/1981
  • Status: Expired
First Claim
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1. A method for manufacturing molds from casting sand or other mixture comprising raw material particles, binder and water, by applying a pressure surge wave to said casting sand or other mixture in a closed chamber, said pressure surge wave being formed by a process comprising the steps of:

  • (a) starting from atmospheric pressure in said chamber, increasing said pressure with a pressure gradient of at least about 50 atmospheres/sec to a maximum pressure of at least about 2 atmospheres;

    (b) maintaining said maximum pressure of at least about 2 atmospheres for at least about 0.01 seconds;

    (c) reducing said pressure from said maximum pressure to atmospheric pressure within at least about 0.2 seconds from the initiation of the pressure increase.

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