The position of the casting in the mold during pouring affects the quality of the precision casting, the dimensional accuracy, and the difficulty of the molding process. Selection principle of pouring position:


1. The important processing surface or main processing surface of the precision casting is facing down or 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 pores, slag, and slag in the upper part of the casting. Defects such as blisters, and the possibility of defects in the lower part of the casting, the structure is denser.

a. The pouring position of the machine bed should have the guide rail face down to ensure the quality of this important working surface. The quality of the circumferential surface is relatively high, and the vertical pouring scheme can be used to make the circumferential surface on the side to ensure uniform quality.

2. The large plane of the precision casting is poured downward or inclined: due to the strong heat radiation of the hot molten metal to the upper part of the mold during pouring, the top surface of the sand mold will expand and arch or even crack, causing sand inclusions, sand holes, etc. on the large surface. defect. The large plane facing down or the method of inclined pouring can avoid the production casting defects of the large plane.

3. The thin wall of the precision casting is facing downwards, standing on the side or inclined: In order to prevent the thin wall of the casting from producing cold barriers and failing to pour 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. Most of the thickness of precision castings should be placed on the top or on the side of the parting surface. The main purpose is to facilitate the placement of risers in thick areas for feeding.

Precision casting pouring production
During the casting process, the position of the casting in the mold will affect the quality, dimensional accuracy and difficulty of the molding process of stainless steel precision casting. The selection principle of the casting position: the important processing surface or main processing surface of the precision casting is facing down or side: when pouring, the gas in the molten metal, the slag and sand in the mold will float.

Defects such as holes, slag inclusions and bubbles may be caused in the upper part of the casting, and the structure is dense under the possibility of defects in the lower part of the casting.

Stainless steel zhu'j
The large surface of stainless steel precision casting is dumped or inclined: due to the strong heat radiation of the molten metal in the upper part of the mold, the sand-shaped expansion arch at the top causes defects such as sand and blisters on the large surface. Large flat-down or inclined casting methods can prevent casting defects in mass production.

The thin wall of the precision casting faces downward, sideways or inclined: In order to prevent the cold partition of the thin-walled part of the casting from being poured in or not poured out, the thin-walled wall with a larger area should be placed in a part of the lower casting or placed in the lower part of the casting. Side wall or inclined position. Most of the thickness of the precision casting should be placed on the top or side of the parting surface. The main purpose is to facilitate the feeding of the riser pipe into the thick-walled part.