Injection riser and riser device for improving internal defects of castings

Abstract

The invention provides an injection riser and an injection riser device for improving internal defects of castings. The injection riser comprises a riser shell, a piston, an elastic assembly and a connecting hook. The riser shell is provided with an inner cavity, the bottom end of the inner cavity is an opening end, the inner cavity comprises a riser effective section and a containing section, and the riser effective section is close to the opening end. The piston is arranged in the riser effective section, and a retainer is arranged at the bottom of the piston. The elastic assembly is connected between the top wall of the inner cavity and the piston. The connecting hook is connected between the top of the riser shell and the retainer and is used for fixing the piston and keeping the elastic assembly in an energy storage state. When the bottom end of the connecting hook is fused by molten iron, the elastic assembly releases stored energy and acts on the piston, and the molten iron in the riser effective section is pushed into the castings so as to conduct feeding on defective parts. When the castings have the defects of shrinkage cavities and shrinkage porosity, the molten iron can be injected into the defective parts of the castings in time to eliminate the defects, the structure performance is improved, the feeding efficiency of the riser is improved, the feeding distance is increased, and the feeding reliability and controllability of the riser are enhanced.

Description

technical field [0001] The invention belongs to the technical field of casting molding, and in particular relates to an injection riser and a riser device for improving internal defects of castings. Background technique [0002] The zero defect inside the casting has a significant effect on the improvement of the mechanical properties of the casting. The internal quality defects of castings (shrinkage cavity, shrinkage porosity) generally have strict requirements. For the produced castings, the internal quality defects should be reduced as much as possible, so that the defects can be completely eliminated. [0003] At this stage, the means to solve the shrinkage cavity and shrinkage defects inside the casting are to use ordinary risers, heating risers or thermal insulation risers, etc. When ordinary risers are used to solve defects, there are problems such as low feeding efficiency and short feeding distance. The feeding efficiency of ordinary risers is only about 15%; the ...

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Problems solved by technology

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide an injection riser and a riser device for improving the internal defects of castings, which is used to solve the problem of low feeding efficiency and feeding distance of the riser in the prior art. Problems with short and unreliable packing

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