Method and flaskless molding line for reducing mold shift of cope and drag that have been molded by flaskless molding machine and assembled

A flaskless molding line comprising:

• a flaskless molding machine that molds a cope and a drag by filling molding sand in an upper flask and a lower flask and squeezing it by means of an upper squeezing board and a lower squeezing board and that pushes out the cope and the drag that have been assembled from the upper flask and the lower flask onto the plate for receiving the mold;
• a device configured to transport the cope and the drag from the flaskless molding machine to a shake-out machine via a position where molten metal is poured into the cope and the drag from a pouring machine;
• a cylinder for pushing out the mold that pushes out the cope and the drag on the plate for receiving the mold to the device configured to transport the cope and the drag;
• a sensor that measures specific data at positions where a mold shift may occur during a process for manufacturing or taking out the cope and the drag;
• a controller that stores data on an allowable range for the specific data that are obtained and that determines if the obtained specific data are within the allowable range;
• and
• a device for detecting the mold shift that detects the mold shift of the cope and the drag, wherein the controller determines if the mold shift has occurred,
• wherein the controller modifies the allowable range for the specific data based on the determination on an occurrence of the mold shift.