Sand mold casting technology is a casting method of sand as the main molding material to prepare mold,is***traditional casting method.Due to its own characteristics(not subject to the shape,size,complexity and type of alloy***,production cycle is short,low cost),so sand casting is still a wide range of casting methods used in casting production,especially single or small batch casting!

　　Today to introduce the sand mold casting process***basic eight processes:sand distribution,molding,core-making,melting,pouring,cleaning,processing,inspection.

　　A,with sand

　　Molding sand and core sand need to be prepared in the sand distribution stage for molding.Generally,sand mixer is used to stir the old drawing and appropriate amount of clay.

　　Second,the system of touch

　　In the stage of mold making,molds and core boxes are made according to the drawings of spare parts.Generally,wooden molds and mass production can be used for individual pieces to make plastic molds or metal molds(commonly known as iron or steel molds),and mold plates can be made for mass castings.Now the mold is basically using engraving machine so the production cycle is greatly shortened,the mold generally needs 2~10 days.

　　Third,core making

　　Modeling(core making)stage:including modeling(forming the cavity of casting with molding sand),core making(forming the inner shape of casting),mold making(putting the nixin into the mold cavity and closing the upper and lower sand boxes).Molding is the key link in casting.

　　Four,melting

　　Melting stage:according to the required metal into the distribution of chemical composition,select the appropriate melting furnace alloy material,the formation of qualified liquid metal liquid(including qualified composition,qualified temperature).Cupola or electric furnace are commonly used in smelting.

　　Five,pouring

　　Pouring stage:the molten iron from the electric furnace is poured into the finished mold with a molten iron bag.The pouring speed should be paid attention to so that the molten iron can fill the whole cavity.In addition,pouring iron is more dangerous need to pay attention to safety!

　　Sixth,to clean up

　　Cleaning stage:after pouring,after the molten metal has solidified,take a hammer to remove the gate and shake out the sand of the casting,and then use a sandblasting machine for sandblasting,so that the casting surface will appear very clean!On the requirements are not strict casting blank after inspection can be basically out of the factory.

　　Seven,processing

　　Casting processing,for some special requirements of casting or casting can not meet the requirements,may need to be simple processing.Generally,grinding wheel or polishing machine is used to remove burrs and make casting more bright and clean.

　　Eight,inspection

　　Casting inspection,casting inspection is generally in the process of cleaning or processing stage,the unqualified have been found out.However,there are some casting requirements,which need to be checked again.For example,some castings require a 5 cm shaft to be inserted through the center hole.