Casting mold shaping apparatus and casting mold shaping method

A method for making a mold using a casting mold shaping apparatus including a driving mechanism with a fluctuation in a force generated in an output unit, and a pressure adjustment device for adjusting the fluctuation in the force of the driving mechanism outputted to the output unit so as to decrease, causing the pressing member to generate a predetermined pressing force necessary for pressing casting sands, the casting mold shaping method comprising:

• an initial pressing force setting step of setting an initial pressing force of the pressing member for pressing the casting sands charged into the molding space formed by an upper filling frame, a molding flask, a carrier plate to which a pattern is fixed, and a lower filling frame to a value higher than a highest pressing force in a scheduled squeezing;
• a back-surface-side preliminary squeezing step of adjusting the pressing force of the pressing member, in a first squeezing to be performed from above the pattern toward a back surface of the pattern, to a first pressing force by the pressure adjustment device;
• a pattern-surface-side squeezing step for adjusting the pressing force of the pressing member, in a second squeezing to be performed upwardly from the pattern surface side, to a second pressing force higher than the first pressing force;
• and
• a back-surface-side main squeezing step of adjusting the pressing force of the pressing member, in a third squeezing to be performed from above the pattern toward the back surface of the pattern, to a third pressing force higher than the second pressing force and lower than the initial pressing force.