Casting production method of large spheroidal graphite cast iron grinding disc with cavity

Abstract

The invention provides a casting production method of a large spheroidal graphite cast iron grinding disc with a cavity. The method is characterized in that a mold is divided into two parts accordingto the height of a first layer of sand box during molding; after a lower mold is produced, the sand boxes are detached layer by layer, the second part of the mold is hoisted away, and the first part of the mold is turned over to produce an upper mold; and after the upper mold is produced, all the sand boxes are combined again, then a sand core is hoisted into a pouring mold again, and finally molten iron pouring is carried out. According to the method, the mold is divided into two parts, and the sand core is placed in the upper mold, so that the problems of flat firing and sand core floating are effectively prevented.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a casting production method of a large ductile iron grinding disc with a chamber. Background technique [0002] At present, there are only 2-3 domestic manufacturers of large-scale grinding discs. The production of grinding discs of other companies adopts the large end of the casting to be located in the lower mold and the upper and lower molds to separate the molded plate. The main defects of this production method are as follows: [0003] 1. It is necessary to make two parts of the mold, such as the upper mold and the lower mold, and the mold has a template, and the mold manufacturing cost is high; [0004] 2. The large end of the casting is located in the lower mold, so that most of the molten iron in the cavity is located in the lower mold, which is prone to the risk of fire escape. In order to avoid fire escape, it is necessary to increase the amount of sand consumed, result...

AI Technical Summary

Problems solved by technology

[0003] 1. It is necessary to make two parts of the mold, such as the upper mold and the lower mold, and the mold has a template, and the mold manufacturing cost is high;

[0004] 2. The large end of the casting is located in the lower mold, so that most of the molten iron in the cavity is located in the lower mold, which is prone to the risk of fire escape. In order to avoid fire escape, it is necessary to increase the amount of sand consumed, resulting in a large amount of sand used in the casting and higher production costs;

[0005] 3. The sand core of the weight-reducing chamber of the casting is located in the lower mold, which needs to be fixed on the lower mold with bolts, and the molten iron wraps the entire sand core. When pouring, the gas in the sand core cannot be discharged from the mold cavity, and the gas enters the molten iron and easily forms pores; at the same time The sand core is easy to float up due to the buoyancy of the molten iron, which leads to a small wall thickness of the casting

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