Vertical type pressure casting method

Details Vertical type pressure casting method Vertical type pressure casting method

B - Operations, Transporting

22

D

22/172

B22D 17/12 (2006.01)

Patent

CA 1191327

ABSTRACT OF THE DISCLOSURE The gist of the construction, casting conditions and program for a casting method capable of attaining the above object of the present invention resides in a method compris- ing the steps of closing gates with a counter tip after lower and upper molds heated to a predetermined temperature have been clamped, pouring melt into a sleeve in which a plunger tip is lifted a predetermined distance, lowering the plunger tip while displacing the counter tip to a predetermined position to open the gates, which are formed such that the ratio of the volume of products to the cross-sectional area of the gates is 20-40 (the volume of products (cm3)/cross-sectional area of gates (cm2) = 20-40), to allow the melt to flow into cavities via the gates by the force of gravity alone with the plunger tip reaching the upper surface of the melt the moment a percentage of the melt placed in the cavities has reached a value between 20 and 70%, and pressure-filling the cavities with the melt by the plunger tip with the melt passing through the gates at 0.4-0.8 m/sec.

403386

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