PRECISION CASTING METHOD USING RUNNER HAVING SPECIFIED VOLUME AND MOLD THEREFOR

摘要

PURPOSE: A precision casting method and a mold therefor are provided to solve the problems caused by the riser effect and the end effect, thereby obtaining a precise and uniform cast iron. CONSTITUTION: The precision casting method comprises the modeling step(S10) of forming a wax model including a riser model having a volume more than ten-times of a casting forming part and a cast iron model connected thereto; the investing step(S20) of investing the wax model in a flask and filling the inside of the flask with an investment; the dewaxing-burn out step(S30) of heating the hardened investment to melt and remove the wax, thereby forming a mold; the casting step(S40) of mounting the mold on a casting machine, pouring a weld pool into the mold and leaving the mold in air to be hardened so that due to the difference of the cooling speed in mold, the cast iron in a runner is broken and heat conduction with outside is blocked; and the finishing step(S50) of performing the separation of the cast-iron from the mold and the post-treatment of the separated cast iron.