Application of Multi-step Gate and Runner System for Pouring Heavy Steel Castings by Bottom Pouring Ladle in Lost Foam Casting
Author of the article:LIU Lizhong
Author's Workplace：Hangzhou Guiju Casting Machinery Co.,Ltd.,Hangzhou 311400,China
Key Words：EPC process large steel castings bottom pouring ladle multistage buffer runner
Abstract：There are few cases in which the EPC process was applied to large steel castings. In addition to the carbon defects caused by foam model, the flow impact force of molten steel in the bottom pouring casting package would destroy the coating, which leaded to the cavity entering sand or the failure of the box was also the main reason. Therefore, the ceramic pipe runner is usually used in EPC for larger steel castings. Ceramic pipe runner is not only expensive, but also tedious to bury. The multistage buffer runner of foam mold can replace the ceramic pipe runner, which can simplify the casting system and make it convenient for workers to operate. Good production and application results have been obtained.
