Metering device for metal casting machines, particularly low pressure casting machines

• US 4,047,558 A
• Filed: 06/25/1975
• Issued: 09/13/1977
• Est. Priority Date: 06/28/1974
• Status: Expired due to Term

• Current Assignee: Honsel Werke AG (Martinrea International Incorporated)
• Original Assignee: Honsel Werke AG (Martinrea International Incorporated)
• Inventors: Wiedenroth, Wolfgang, Kotthoff, Winfried
• Primary Examiner(s): Husar, Francis S.
• Assistant Examiner(s): Brown, John S.
• Application Number:
  US05/590,276
• Time in Patent Office: 811 Days
• Field of Search: 164/4, 164/119, 164/133, 164/154, 164/155, 164/157, 164/285, 164/306, 164/309, 425/145, 425/146, 425/147, 425/149, 235/151.1
• US Class Current: 164/309
• CPC Class Codes: B22D 18/08 Controlling, supervising, e.g. for safety reasons controlling or regulating in general G05

Abstract

A metering device and method for introducing molten metal from a reservoir into a mold, the metering device including a pilot valve, a control valve actuated by the pilot valve, and an analog computer controlling operation of the pilot valve, the computer receiving signals corresponding to the speed of filling of the mold, the magnitude of the pressure up to solidification of the first casting in the mold, and the change in pressure in the reservoir due to decrease in the metal level in the reservoir.

Claims

1. In a metal casting machine including a mold, a reservoir connected to the said mold, and gas pressure means connected to said reservoir for delivering molten metal from said reservoir to said mold, a pressure control device comprising a control valve, a pilot valve feeding said control valve with a predetermined gas pressure, and a conduit communicating said control valve with the pressure in said reservoir, said control valve functioning as a differential pressure valve to apply the difference in pressures across said control valve as a control for said gas pressure means.

2. A casting machine according to claim 1 in which said pilot valve is a servo valve electrically controllable by a computer.