Hidden exhaust structure, gating system and casting method of large casting

Abstract

The invention discloses a hidden exhaust structure of a large casting. The hidden exhaust structure of the large casting comprises a sand box; a runner and a mold cavity which communicate with each other are formed in the sand box; an exhaust component is further embedded in the sand box; the exhaust component is arranged above the mold cavity; the exhaust component comprises a plurality of sublimable air outlet strips which are arranged in parallel at intervals; a plurality of sublimable air outlet blocks are arranged on each air outlet strip at intervals; and the air outlet blocks communicate with the mold cavity. According to the hidden exhaust structure of the large casting, by means of a gating system and a technology of controlling the pressure of the mold cavity through molded surface hidden exhaust, the overall pressure value in the mold cavity is adjusted, uniform distribution of pressure is guaranteed, stable release of the pressure of the mold cavity is achieved, and later molten iron turbulence slag entrapment is avoided.

Description

technical field [0001] The invention belongs to the technical field of full mold casting, and specifically discloses a dark exhaust structure, a pouring system and a casting method of a large casting. Background technique [0002] The full mold casting uses polystyrene foam as the raw material to make the model, and directly pours the mold without taking it out during the pouring process. During the pouring process, the foamed plastic model is gasified and burned by the action of high-temperature molten iron, and the molten metal occupies the space of the model. A casting method that forms the desired casting shape. During the sublimation and combustion process of the foam model, a large amount of gas is generated by cracking, which leads to an increase in the cavity pressure in the mold, which in turn affects the filling speed of the liquid metal. [0003] In order to reduce the filling resistance of liquid metal, the technology mainly used at present is centralized exhaus...

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Problems solved by technology

[0004] It can be seen from the above that the concentrated exhaust technology mainly has the following problems: 1. The air pressure in the mold is not evenly distributed, and the molten iron flows turbulently; out of balance

Due to the different pressures on the molten iron layer, turbulent flow occurs on the liquid surface, resulting in slag entanglement in the casting, and the depth of the slag hole defect is too deep; 2. It affects safety. easy to cause safety risk

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