Title:
PRESSURIZE-CONTROL METHOD IN LOW PRESSURE CASTING AND DEVICE THEREFOR
Document Type and Number:
Japanese Patent JP3388019
Kind Code:
B2
Abstract:
PURPOSE: To obtain a high grade product by eliminating the casting defect 7 caused by the surface condition of molten metal.
CONSTITUTION: At the time of detecting that the molten metal is filled up into a cavity in a mold, with a filling detection circuit 22, a reference pressurizing pattern is corrected. The pressure applied to the molten metal surface according to the reference pressurizing pattern after correcting, is controlled with a flow rate adjusting valve control part 29. The differential value between the set pressure value of the reference pressurizing pattern after correcting and the pressure value of the reference pressurizing pattern before correcting, is calculated with a differential pressure arithmetic part 30. The set pressure value of the reference pressurizing pattern in the period till filling up the molten metal into the cavity in the mold in the following casting process based on the calculated differential pressure, is corrected with a set pressure correcting part 31.
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Inventors:
Nobuyuki Matsubayashi
Tohru Takeshita
Tohru Takeshita
Application Number:
JP9947494A
Publication Date:
March 17, 2003
Filing Date:
May 13, 1994
Export Citation:
Assignee:
Mazda Corporation Inc
International Classes:
B22D18/04; B22D18/08; (IPC1-7): B22D18/08; B22D18/04
Domestic Patent References:
| JP62248551A | ||||
| JP2251355A | ||||
| JP596356A | ||||
| JP5228604A |
Attorney, Agent or Firm:
Kenzo Hara