Bottom gating system with ingate in circular cross section

Abstract

The invention discloses a bottom gating system with an ingate in circular cross section, which belongs to the technical field of casting, the existing gating system is not applicable to gating large casts, high in rejection rate and easy to lead the casts to produce stress and porosity so as to cause the high rejection rate of the casts. The bottom gating system comprises a mold cavity and a main sprue, a runner, a sub-sprue and a sub-runner in sequential connection, and is characterized in that the sub-runner is connected to the bottom part of the mold cavity via the ingate in the circular cross section. The bottom gating system can reduce the volume of a sand box, reduce the consumption of molding sand and further greatly reduce the production cost by adopting the ingate in the circular cross section; the bottom gating system can further lead molten metal to flow into the mold cavity smoothly, effectively prevent oxidizing slag which is produced by turbulent flow of the molten metal from being entangled into the mold cavity, prevent the production of slag inclusion in the cast, and further improve the quality of the cast; as molten iron enters into the mold cavity through the ingate in the circular cross section, the bottom gating system is difficult to produce temperature difference, and can reduce the production of the porosity and ensure the quality of the cast; and the operation is convenient.

Description

Technical field [0001] The invention belongs to the field of casting technology, in particular to a bottom casting type pouring system of a runner in a ring-shaped section. Background technique [0002] In the prior art, the speed of molten metal flowing into the cavity is generally controlled by one of the following gating systems: one is to set a plurality of scattered flat trapezoidal inner runners with connected cavity on one side of the bottom runner. The other is to set a plurality of scattered ceramic pipe inner runners connected to the cavity on the lower side of the bottom runner. [0003] Of the two aforementioned pouring systems, the first one cannot meet the requirements of large flow and low flow rate, and is not suitable for pouring large castings. In particular, when molten metal flows into the cavity through this place, the temperature of the casting at the corresponding inner runner is high and far away The temperature of the part of the inner runner is low, that ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved and the technical task proposed by the present invention are to overcome the defect that the existing gating system tends to cause stress and looseness of the castings, resulting in high rejection rate of the castings, and to provide a bottom pouring gating system with an annular section inner runner

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