Patent ID: 8672017

Claim:
A method for green sand molding comprising the steps of: filling the green sand into a flask while fluidizing the green sand by low pressure aeration at a pressure between 0.05 and 0.18 MPa; and squeezing the green sand that has been filled in the flask; wherein a mold is produced so that the friability of the mold is 10 or less, where the friability is a value that is calculated by the steps of: putting the mold in a rotating cylindrical sieve that has a diameter of 177.8 mm and USA sieve size No. 8, which is a sieve having openings of 2.38 mm; rotating the cylindrical sieve at 57 rpm for 60 seconds; dividing the weight of the sand that has passed through the sieve by the weight of the sand that has been put into the sieve; and multiplying the quotient by 100.