Method for molding

Abstract

A method for molding by which the density of sand of a mold is almost uniform. The method includes a step of forming a molding space by using a flask, using an auxiliary flask that has a lower opening that is connectable to an upper opening of the flask, using a squeeze head that has a squeeze board and has a plurality of squeeze feet that pass through the squeeze board and vertically move, and using a pattern plate, a step of filling the molding sand into the molding space, and a step of squeezing the molding sand by lowering the squeeze head, wherein the squeeze feet that face a concavity of a pattern are lowered at the same time as the step of squeezing starts or during the step of squeezing.

1 . A method for molding by using molding sand wherein a flask and a pattern plate are used, the method comprising the steps of:
 forming a molding space by using the flask, using an auxiliary flask that has a lower opening that is connectable to an upper opening of the flask, using a squeeze head that has a squeeze board that can enter and withdraw from the auxiliary flask and has a plurality of squeeze feet that pass through the squeeze board and vertically move in relation to the squeeze board, and using the pattern plate;   filling the molding sand into the molding space, which molding sand has been stored in a hopper for filling the molding sand; and   squeezing the molding sand by lowering the squeeze head;   wherein the squeeze feet that face a concavity of a pattern that is formed in the pattern plate are lowered at the same time as the step of squeezing starts or during the step of squeezing.   
     
     
         2 . The method for molding of  claim 1 , wherein a pressure to lower the squeeze feet that face the concavity of the pattern that is formed in the pattern plate is adjusted. 
     
     
         3 . The method for molding of  claim 1 , wherein, in the step of squeezing, a pressure for squeezing that is a pressure to squeeze the molding sand is measured, and
 wherein if the measured pressure for squeezing reaches a predetermined pressure, the squeeze feet that face the concavity of the pattern that is formed in the pattern plate start to be lowered.   
     
     
         4 . The method for molding of  claim 1 , wherein, in the step of squeezing, a downward distance of the squeeze head to squeeze the molding sand is measured, and
 wherein, if the measured downward distance reaches a predetermined distance, the squeeze feet that face a concavity of the pattern that is formed in the pattern plate start to be lowered.   
     
     
         5 . The method for molding of  claim 1 , wherein, in the step of forming the molding space, the squeeze feet that face the convexity of the pattern that is formed in the pattern plate are lowered, and then the step of filling is carried out. 
     
     
         6 . The method for molding of  claim 5 , wherein after the step of filling, the step of squeezing is carried out after the squeeze feet that face the convexity of the pattern that is formed in the pattern plate are lifted or while the squeeze feet are being lifted. 
     
     
         7 . The method for molding of  claim 1 , wherein a frame that encloses, and vertically slides on, the outer circumference of the pattern plate, is used, and
 wherein the molding space is partially formed by means of the frame.