Patent ID: 6390178
Filing Date: 2002-05-21
Classification: B22C

Abstract:
A method of operating a green-sand molding machine with the aid of a computer, said green-sand molding machine including a pattern plate, to compact green sand fed into a green-sand mold by applying pressure of squeezing to said green sand under a green-sand molding process to be carried out by said green-sand molding machine, said method comprising the steps of:(a) providing said computer with data for said green-sand molding process to be carried out by said green-sand molding machine, a design condition of said pattern plate, physical properties of said green sand, and said applied pressure of squeezing; (b) calculating by said computer a charging of green sand in said green-sand mold based on said data before said green-sand mold has been actually produced; (c) repeating said step (b) until a desired value for at least one of strength, porosity, and internal stress of said green-sand mold to be molded is obtained, while the applied pressure for squeezing is changed; and (d) operating said green-sand molding machine based on the result of said calculated charging of green sand in said green-sand mold so as to make a controlled amount for said green-sand molding wherein the calculating step (b) includes calculating movement of sand particles contained in said green sand and further wherein said steps (a) and (b) are repeated until said sand particles that are contained in said green sand stop moving.