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Top pouring type mold filling system of directional solidification turbine blades

A turbine blade, directional solidification technology, applied in the direction of mold, core, mold composition, etc., can solve the problem of high scrap rate of directional solidified turbine blades, reduce the generation of inclusions and oxides, eliminate turbulence, and reduce oxidation the effect of things

Active Publication Date: 2021-10-15
CHINA HANGFA SOUTH IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a top-injection filling system for directional solidification turbine blades to solve the technical problem of high scrap rate of directional solidification turbine blades manufactured by the existing top-injection filling system

Method used

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  • Top pouring type mold filling system of directional solidification turbine blades
  • Top pouring type mold filling system of directional solidification turbine blades

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Embodiment Construction

[0022] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in various ways defined and covered below.

[0023] Such as figure 2 As shown, the preferred embodiment of the present invention provides a top injection filling system for directional solidified turbine blades, which includes a sprue cup 1, a first ceramic filter screen 2, a sprue 3, an ingate 4, a casting type cavity 5 and crystallizer 6, a plurality of said casting cavity 5 is evenly distributed along the circumference on said crystallizer 6, and the ingate 51 of each casting cavity 5 passes through a said inrunner 4 and said straight line The bottom of the sprue 3 is connected, each of the in-runners 4 is inclined upward, and the first ceramic filter screen 2 is arranged on the top of the sprue 3, and the sprue 3 is large at the top and small at the bottom. structure, the sprue cup 1 is arranged on the...

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Abstract

The invention discloses a top pouring type mold filling system of directional solidification turbine blades. A sprue with a big-end-up structure is arranged below a pouring cup, so that a larger and larger flow limiting effect is generated on fallen molten metal, a part of turbulent flow is effectively eliminated, the splashing effect is eliminated, and the generation of inclusions and oxides is reduced; the top of each casting cavity communicates with the bottom of the sprue through ingates which are obliquely arranged upwards, the ingates are provided with filter screens, large uphill resistance is formed, the flow speed of the molten metal can be further reduced, turbulent flow is further eliminated, and inclusions in the molten metal have a great chance to be attached to the inner walls of the ingates; and moreover, the molten metal can generate a siphonic effect when flowing into the casting cavities from the ingates, so that the flow speed of the molten metal is limited again, the molten metal is prevented from falling in an accelerated manner under the action of gravity in the final mold filling stage and colliding with the bottoms of the casting cavities to cause regeneration of inclusions, and the rejection rate of the inclusions is further reduced.

Description

technical field [0001] The invention relates to the technical field of investment casting of turbine blades, in particular to a top injection type filling system for directionally solidified turbine blades. Background technique [0002] Industrially, the casting of gas turbine blades for aero-engines is usually carried out in a vacuum furnace, and the casting mold is a ceramic shell sintered from refractory materials, which is prepared by investment molding process. In a vacuum furnace (the residual atmospheric pressure is about 1-10Pa), the key casting process of the turbine blade is as follows: the mold shell is preheated to a certain temperature, the master alloy is remelted in the crucible, and the crucible is tilted to pour the molten metal into the mold. The shell sprue cup and the filling system inside the mold shell guide the molten metal into the part cavity, the part cavity is filled, the part solidifies, and the mold shell cools. When pouring molten metal, the he...

Claims

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Application Information

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IPC IPC(8): B22C9/08B22C9/04B22C9/20
CPCB22C9/082B22C9/086B22C9/088B22C9/04B22C9/20Y02P10/25
Inventor 张龙飞谢维钟文惠丁鹏飞黄秋玉盛俊英
Owner CHINA HANGFA SOUTH IND CO LTD
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