각종 주물사의 특성과 주강품 주조에 적합한 인공사 선택

Abstract

Natural silica sand was commonly used for sand casting of steel castings, and chromite sand was also used to suppress sand burn-on defect due to the lack of thermal properties of silica sand. However, there are disadvantages such as deterioration by repeated use, problems with mixing system sand, difficulty in separation and removal, increased load during molding due to high density, and waste containing chromium. Recently, industrial waste reduction and atmospheric environment improvement have been highlighted as important tasks in the casting industry. In order to solve the problems that occur when using conventional foundry sand and to improve the environment of casting factories, various artificial sands that can be applied instead of natural sands have been developed and introduced. Artificial sands can be classified into artificial sand manufactured by the Electric Arc Gas Atomization or Powder Flame Gas Atomization, artificial sand manufactured by the Spray Drying & sintering Process, artificial sand manufactured by the sintering & grinding Process. And exhibit different physical properties depending on the type of raw-minerals and manufacturing method. In this study, foundry sands suitable for casting steel products were selected through comparative evaluation tests on the physical properties of various foundry sands, mold strength, physical durability, thermal durability, casting of sand burn-on test piece.