During the casting process, the position of the casting in the mold will affect the quality of Precision casting, dimensional accuracy and the difficulty of the forming process. The principle of selecting the pouring position: the important or main machining surface of the precision casting is facing down or side: during pouring, the gas, slag and sand in the mold will float upwards, which may form pores and slag inclusion castings The upper part. Defects such as blisters and the possibility of defects in the lower part of the casting make the tissue denser.
One. The casting position of the machine tool should be with the guide rail facing down to ensure the quality of important working surfaces. The quality of the circumferential surface is relatively high. The vertical casting scheme ensures uniform quality of the sides.
The casting of precision castings is facing down or tilted: due to the strong heat radiation of the molten metal in the upper part of the casting, the sand-like expansion arch at the top even breaks, resulting in sand, water bubbles, etc. On the big plane. defect. Large flat face down or oblique casting methods can avoid casting defects in mass production.
The thin wall of the stainless steel castings china is facing downward, sideways or inclined: In order to prevent the thin wall of the casting from being cold-separated and free of defects, a thin wall with a large area should be placed on the lower part of the casting. Cast or placed in a side or inclined position. 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 risers into thick-walled sections.