Determination Method and Pouring Skills of Precision Casting Pouring Surface

Determination Method and Pouring Skills of Precision Casting Pouring Surface

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

precision casting pouring

1. The importance of precision castings machined surface or main machined surface downward or on the side: when pouring, the gas, slag in the molten metal and sand particles in the mold will float up, which may cause defects such as pores, slag inclusion, sand holes and other defects in the upper part of the casting, however, under the possibility of defects in the lower part of the casting, the structure is denser.

a. The pouring position of the machine tool bed should face down the guide rail to ensure the quality of the important working face. The quality requirements of its circumferential surface are high, adopt vertical pouring scheme, The circumferential surface can be on the side to ensure uniform quality.

2. The large plane of precision castings is poured downward or inclined: due to the strong thermal radiation of the hot molten metal on the upper part of the mold during pouring, the top surface sand mold is expanded and arched or even cracked, causing sand inclusion on the large plane, defects such as sand holes. 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 down, standing on the side or inclined: in order to prevent the thin wall of the casting from causing cold insulation and casting defects, the thin wall with a larger area should be placed in the lower part of the casting, or make it in the side wall or inclined position.

4. The thick part 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 placement of risers in the thick part for feeding.

Precision Casting and Pouring Production

in 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 casting location: important machined surfaces of precision castings or main processing surface 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 tissue is dense under the possibility of defects in the lower part of the casting.

Stainless steel

large plane dumping or tilting of stainless steel precision casting: due to the strong thermal radiation of molten metal on the upper part of the mold, the top sand expansion arch, thus causing defects such as sand and sand holes on a large plane. Large plane-down or inclined casting methods can prevent large-scale casting defects.

The thin wall of the precision casting is downward, sideways or inclined: to prevent the cold partition wall of the thin-walled part of the casting from pouring or no pour out, the thin wall with a larger area should be wall place on part of the lower casting or on the lower part of the casting. Sidewall or inclined position. Most of the thickness of precision castings should be placed on the top or side of the parting surface. The main purpose is to facilitate the feeding of the riser into the thick-walled part.