o cool large masses faster.Р安放砂芯来制成铸件的凹形结构或内部特征。为了以后铸模匹配还要用到定位销。对大质量铸件可能需要加入冷却物来使其较快冷却。Р5. The patterns are removed, and the molds may be put through a baking stage to increase strength.Р6. Mold halves are mated and prepared for pouring metal.Р5. 取走型模,将铸模烘焙以增加强度。Р6. 匹配上下铸模,做好浇铸金属的准备。Р7. Metal is preheated in a furnace or crucible until is above the liquidus temperature in a suitable range (we don’t want the metal solidifying before the pour plete). The exact temperature may be closely controlled depending upon the application.Р7. 金属在熔炉或坩埚中预热到高于液化温度的一个合适范围内(不希望金属在浇铸完成前凝固)。确切的温度要根据应用场合严格控制。РDegassing, and other treatment processes may be done at this time, such as removal of impurities (i.e. slag). Some portion of this metal may be remelted scrap from previously cast parts—10% is reasonable.
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