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  • Product Name: Sand mould--remove the pattern
  • Model No: Sand mould--remove the pattern
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Description : 2. For our American project—flat on one side; ribs on other side, closed at the bottom and top together, be filled with prepared casting sand or green sand—a slightly moist mixture of sand and clay; The color is red, so aluminum sand casting is named red sand casting; if make cast iron, the color of sand is black, so iron sand casting is named black sand cast. The sand is packed in through a vibratory process or press process. The pattern is placed on the sand. Other sand is rammed over and around the pattern. Finally a cover is placed on the box and it is turned and unlatched, so that the halves of the mold may be parted and the pattern with its sprue and vent patterns removed. Additional sizing may be added and any defects introduced by the removal of the pattern are corrected. The box is closed again. This forms a "green" mold which must be dried to receive the hot aluminum. If the mold is not sufficiently dried a steam explosion can occur that can throw molten aluminum. Sand may also be bonded by chemical binders, such as furane resins or amine-hardened resins.