How to determine the pouring surface of precision casting

The determination of the precision casting pouring surface has the following situations:

The important processing surface or the main processing surface of the casting faces downward or is located on the side. During pouring, the gas in the molten metal, the slag and the sand in the mold will float up, which may cause defects such as pores, slag inclusions, and blisters in the upper part of the casting, while the lower part of the casting is less likely to have defects and has a denser structure.

The quality requirements of the circumferential surface are relatively high, and the vertical casting scheme can be used to make the circumferential surface on the side to ensure uniform quality.

Precision castings are cast with the large surface facing down or at an angle. Since the hot molten metal has strong thermal radiation on the upper part of the mold during pouring, the sand mold on the top surface expands, arches, or even cracks, causing defects such as sand inclusions and blisters on the large surface. Casting defects with the large surface facing down or at an angle can be avoided.