3. Gate ① The parting surface should not be closed […]
① The parting surface should not be closed immediately after the metal liquid enters the mold. The overflow groove and exhaust groove should not directly impact the core. After the flow of molten metal into the cast-in type as ribs and fins, the thick-walled thin wall to fill the like.
② When selecting the position of the gate, make the metal liquid flow as short as possible. When using the multi-strand gate, to prevent the liquid metal type confluent after several strands, impact each other, thereby generating a vortex aeration and oxidation inclusions and other defects.
③ thick gate thin-walled inner member smaller pieces should be appropriate to ensure the necessary filling speed, should be provided to facilitate the removal of the gate, the body does not have the casting defect (meat).
① overflow channel to facilitate the removal of the casting from, and as far as possible without damaging the cast body.
② When the exhaust groove defines the overflow tank, the overflow opening location to be noted, to avoid premature clogging exhaust groove, the exhaust groove inoperative.
③ several overflow outlet should not be opened on the same or isopipe defines a wide thick overflow port, to avoid the cold liquid in the liquid metal, slag, gas, and other paint back to the pocket from the overflow tank , resulting in casting defects.