Precautions for lost foam casting

There are certain specifications and requirements for lost foam casting, and the following aspects should be paid attention to in the molding process: lost foam casting generally uses silica sand, and its silica content is required to be above 85% ~ 90%. From the aspects of air permeability and refractoriness, cast steel and iron castings generally use silica sand with a particle size of 0.850~0.300mm. First put a layer of dry sand with a thickness of about 100mm on the bottom cloth of the sand box, and then place the EPS mold and spruer brushed with paint in the center of the sand box, and shake while filling the sand until the dry sand is about 50mm from the top surface of the sand box, stop adding sand, cover the dry sand with a plastic film, and then place the gate cup at the top of the straight gate, and remove a layer of loose sand on the film to prevent molten iron from splashing down during pouring, burning through the film and causing air leakage collapse.