1. The important processing of precision castings or the main processing side down or on the side: pouring, the metal liquid in the gas, slag and the sand in the mold will float, there may be cast the upper part of the pores, Trachoma and other defects, and the possibility of defects below the casting, the organization is more dense.
A. The position of the machine bed should be guided down to ensure the quality of the important working face. The circumferential surface of the high quality requirements, the use of vertical pouring program, the circumferential surface can be in the side, to ensure uniform quality.
2. The large flat face of the casting or pouring pouring: As the hot metal pouring on the upper part of the mold has a strong heat radiation, causing the top of the sand type expansion arch or even crack, so that the large plane sand, sand, etc. defect. Large flat face down or inclined pouring method to avoid large plane production casting defects.
3. The thin wall of the precision castings is facing downwards, sideways or tilted: To prevent the cold parts of the casting from being thin, and to devour the defects, place the larger wall in the lower part of the casting or make it in the side wall or Tilted position.
4. The thick part of the precision castings should be placed on the top or on the side of the parting surface. The main purpose is to facilitate the filling of the riser at the thick