The surface molding sand of the sand mold and sand core is easy to fall off, and it is easy to collapse when the box is closed, and it is easy to cause sand and fleshy defects on the castings.
The surface molding sand of sand mold and sand core is easy to fall off, and it is easy to collapse when closing the box, which is easy to cause sand inclusion and fleshy defects on the casting
The molding sand on the surface of the mold and sand core is easy to fall off and collapse when the mold is closed, which easily causes sand inclusion and fleshy defects on the castings.