Tilt casting apparatus and tilt casting method

Abstract

The present disclosure relates to a tilt casting mold, a tilt casting apparatus, and a tilt casting method that can manufacture a molded product with a small quality difference without compensation for contraction of molten metal by forming a riser on a tilt casing mold and pressing the riser. According to an embodiment, there is provided a tilt casting mold that includes a cope and a drag, in which when the cope and the drag are combined, a predetermined cavity is formed therein and a riser is formed on a side of the cavity; a pouring cup is coupled to a surface having the riser of the drag; molten material is poured in the pouring cup and then the molten metal in the pouring cup is injected into the cavity by tilting the mold assembly composed of the cope, the drag, and the pouring cup.

1 . A tilt casting apparatus, comprising:
 a tilt casting mold that includes a cope and a drag, in which when the cope and the drag are combined, a predetermined cavity is formed therein and a riser is formed on a side of the cavity, a pouring cup is coupled to a surface having the riser of the drag, molten material is injected into the pouring cup and then the molten metal in the pouring cup is injected into the cavity by tilting a mold assembly composed of the cope, the drag, and the pouring cup;   a tilting apparatus injecting molten metal into the cavity by tilting the tilt casting mold at a predetermined speed; and   a pressing apparatus pressing the riser,   wherein the pressing apparatus includes:   a riser cover formed to accommodate the outer surface of the riser of the tilt casting mold and forming a predetermined sealed space including the riser by being fixed to the tilt casting mold; and   a piston accommodated inside the riser cover and pressing the riser in the sealed space formed by the riser cover fixed to the tilt casting mold, in which the pouring cup is separated after the molten metal is injected into the cavity by operating the tilting apparatus and the riser is pressed by the piston after the riser cover is fixed to the tilt casting mold to accommodate the riser, and   the tilt casting apparatus further includes a hydraulic apparatus pressing the riser cover, the piston, the cope, and the drag through a single hydraulic circuit,   wherein the hydraulic apparatus is controlled such that {circle around (1)} the magnitude of the pressure applied to the tilt casting mold by the riser cover is larger than the magnitude of the pressure applied to the molten metal by the piston and {circle around (2)} the magnitude of the pressure applied to the cope and the drag is larger than the magnitude of the pressure applied to the riser cover.   
     
     
         2 . The tilt casting apparatus of  claim 1 , wherein the hydraulic apparatus is configured such that the area of a cross-section perpendicular to a pressing direction of the riser cover is larger than that of the piston. 
     
     
         3 . The tilt casting apparatus of  claim 1 , wherein an electromagnet is disposed on a side of the riser cover such that the pressing apparatus brings the riser cover and the tilt casting mold in close contact with each other when the riser is pressed by the piston. 
     
     
         4 . The tilt casting apparatus of  claim 1 , wherein the riser cover and the tilt casting mold has fasteners corresponding to each other such that the pressing apparatus couples and fixes the riser cover and the tilt casting mold when the piston presses the riser. 
     
     
         5 . The tilt casting apparatus of  claim 1 , wherein the pressing apparatus is configured to start pressing the cavity under the condition of 0.8L 3 ≤L 2 (B/A−1)≤0.95L 3  in which (1) the cross-sectional area of the piston is A, (2) the internal cross-sectional area of the riser cover is B, (3) the insertion depth of the piston in the riser is L 1 , (4) the internal depth of the riser cover is L 2 , and (5) the depth of the riser is L 3 . 
     
     
         6 . A tilt casting method using the tilt casting apparatus of  claim 1  and comprising:
 a pouring cup coupling step of fixing a pouring cup to the tilt casting mold; 
 a first molten metal injection step of injecting molten metal into the pouring cup after the pouring cup-coupling step; 
 a second molten metal injection step of injecting the molten metal in the pouring cup into the cavity using gravity by tilting the tilt casting mold after the first molten metal injection step; 
 a pouring cup separation step of separating the pouring cup from the tilt casting mold after the second molten metal injection step; 
 a pressing preparation step of bringing the riser cover in close contact with the tilt casting mold to accommodate the riser after the pouring cup separation step; 
 a pressing step of pressing the molten metal in the riser by pushing the piston after the pressing preparation step; 
 a cooling step of cooling the molten metal during the pressing step; 
 a pressure removing step of separating the pressing apparatus from the tilt casting mold after the pressing step and the cooling step; and 
 a casting separation step of separating a casting from the tilt casting mold by separating the cope and the drag after the pressure removing step.