Special cold iron sand core and preparation method thereof

Abstract

The invention discloses a special cold iron sand core and a preparation method thereof. The special cold iron sand core comprises a sand core body, wherein the sand core body comprises a circumferential surface, a core head arranged at the upper end of the circumferential surface, and a core seat at the lower end, the circumferential surface of the sand core body is a conical surface with a smallupper end and a large lower end, the circumferential surface of the sand core body is uniformly provided with venting holes, and the center of the sand core body is provided with an venting passage penetrating through the core head and the core seat. The cold iron sand core replaces a resin sand core, thereby accelerating the cooling speed of a hot section of a ductile iron casting, reducing the defects of shrinkage porosity and pores at the hot section of the casting, and preventing the defects of gray spot sulfuration at an inner hole processing part of the ductile iron casting. The processis simple, the venting is convenient, and a product can be reused, thereby ensuring the quality of the casting and reducing the production cost.

Description

technical field [0001] The invention relates to the field of casting production, in particular to a special chilled iron sand core for casting production of nodular iron elevator rotor parts. Background technique [0002] In the production of castings, sand cores are generally used to form the inner cavity, holes and parts of the casting that cannot produce sand through the sand core. In order to obtain qualified castings, the sand core must have sufficient strength and rigidity; in castings During the forming process, the gas generated by the sand core can be discharged out of the mold in time; when the casting shrinks, the resistance is small, and the sand is easy to clean. In the casting production of ductile iron elevator rotor parts, due to the use characteristics of the product, the quality requirements for the interior and inner hole of the product are high, and any defects such as shrinkage cavity, porosity, porosity, and slag inclusion are not allowed, and furan is ...

AI Technical Summary

Problems solved by technology

However, the furan resin sand core is used as the inner hole of the rotor, and the cold iron is not convenient to install. After the inner hole of the casting is processed, it is easy to produce gray spots, sulfur seepage defects, and shrinkage defects at the intersection of the inner hole and the hot joint.

Images