Patent ID: 8327913
Filing Date: 2012-12-11
Classification: B22D

Abstract:
1. A press for producing a casting from molten metal in a mold, said press comprising: a movable frame; an up-and-down means having a rod attached to the movable frame; a plate connected to an end portion of the rod of the up-and-down means; guide rods that extend perpendicularly upward from the plate and slide with respect to the moveable frame to guide the plate when the plate is moved up and down by the up-and-down means; an upper molding flask containing an upper sand mold having a convex portion; a fixing means attached to the plate to fix the upper molding flask thereto so that the convex portion of the upper sand mold faces downward; a fixed lower molding flask containing a lower sand mold having a concave portion facing upward and corresponding to the convex portion of the upper sand mold so that a cavity in the shape of a casting is formed when the upper sand mold is overlapped and pressed onto the lower sand mold to form a mold; a detection means attached to the end portion of the rod of the up-and-down means for detecting and obtaining information on the status of the upper sand mold, which upper sand mold is caused to overlap and be pressed against the lower sand mold by downward movement of the plate by the up-and-down means after molten metal has been poured into the convex portion of the lower sand mold; operation circuits for controlling movement of the movable frame, lifting and lowering movement of the up-and-down means, the fixing means, and the movement of the up-and-down means based on the information detected and obtained by the detection means, wherein the operation circuit for the up-and-down means has an input circuit that sets a speed of the up-and-down means at a predetermined first downward speed until the upper sand mold is lowered to a predetermined position just before the upper sand mold starts contacting a surface of molten metal in the lower sand mold, and then sets a speed of the up-and-down means at a predetermined second speed after the upper sand mold is further lowered beyond the predetermined position to overlap and press the upper sand mold against the lower sand mold and form the mold in which a casting is produced in said cavity; and a memory circuit that stores the information on the status of the upper mold, which is information on the pressure that the upper sand mold receives from the molten metal and the lower sand mold or a distance that the upper sand mold descends.