Patent ID: 8567478
Filing Date: 2013-10-29
Classification: B22C

Abstract:
1. A method for making upper and lower molds comprising the steps of: holding a match-plate between cope and drag flasks; inserting upper and lower squeezing members into respective openings of the cope and drag flasks, which openings are opposite to the match-plate, thereby defining upper and lower molding spaces; supplying molding sand to the upper and lower molding spaces; moving the upper and lower squeezing members forward to the match-plate to squeeze the molding sand in the upper and lower molding spaces to form the upper and lower molds, and backward from the match-plate after the squeezing of the molding sand has been completed; measuring respective squeezing pressure values of the upper and lower squeezing members as the squeezing members are moved forward and the molding sand is squeezed; determining a difference between the values measured; and comparing the difference to a predetermined tolerance of difference; wherein if the difference is larger than the predetermined tolerance, the squeezing member having the larger pressure is stopped from moving forward until the difference falls within the predetermined tolerance, and after the difference falls within the predetermined tolerance the squeezing member that had the larger pressure is moved forward again.