MOLDING METHOD FOR CASTING MOLD

摘要

PURPOSE:To dry and harden molding sand quickly and firmly by improving the packability of the molding sand by blowing potassium silicate as a binder and passing hot air through the packed molding sand. CONSTITUTION:Molding sand contg. potassium silicate as a binder is packed into the cavity parts consisting of a top mold and a bottom mold 17; thereafter the top mold is removed and a cover member 22 is put on so as to cover a casting mold 21 and the mold 17. An upward and downward moving table 2 is moved upward by the extending operation of a cylinder 2 and the supply hole 24 of the member 22 is press stuck airtightly with the vent hole 13 of a clamping head 11 so as to be communicated therewith. Thereafter an electromagnetic stop valve 15 is opened to supply the heated and compressed air in a tank 7 through a hose 14, the hole 13 and the hole 24 into the member 22. The heated and compressed air passes through the inside of the mold 21 from the entire surface of the mold 21 and is discharged through an air release hole 5 after passing through vent holes 20, a recess 18 and a through-hole 4. Thus the moisture in the mold 21 is evaporated quickly and the molding sand is dried and hardened in a short time.