The position of the casting in the mold during casting affects the quality of the precision casting, the dimensional accuracy, and the difficulty of the molding process.
The selection principle of the pouring position:
1. The important processing surface of the precision casting or the main processing surface is facing down or on the side: when pouring, the gas, molten slag and the sand in the mold will float upward, which may cause pores and slag inclusions in the upper part of the casting. Defects such as blisters, and the possibility of defects in the lower part of the casting, the organization is denser.
The casting position of the machine bed should be placed face down to ensure the quality of the important working face. The quality of the circumferential surface is relatively high. The vertical casting scheme is adopted to make the circumferential surface on the side to ensure uniform quality.
2. The casting of the precision casting is directed downward or obliquely: due to the strong thermal radiation of the molten metal on the upper part of the casting, the top sand-shaped expansion arches are even cracked, causing sand, blisters, etc. in the large plane. defect. The large flat face down or the oblique casting method can avoid large-scale production casting defects.
3. The thin wall of the precision casting is facing down, sideways or inclined: in order to prevent cold partitioning of the thin part of the casting and no defects, the thin wall with a larger area should be placed in the lower part of the casting or placed on the side wall or Tilt position.
4. The thickness of the precision casting should be placed on the top or on the side of the parting surface. The main purpose is to facilitate the feeding of the riser in the thick part.
Ningbo QS Machinery Inc
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