Casting technological method of graphite titanium alloy casting

Abstract

The invention relates to the field of titanium alloy casting, particularly to a casting technological method of a graphite titanium alloy casting. The casting technological method comprises the stepsof acquiring an optimal casting angle according to a three-dimensional digital model of the graphite titanium alloy casting by virtue of Huazhu CAE simulation software; then, parting a pouring gate digital model established based on the optimal casting angle; processing graphite into graphite theoretical casting molds, carrying out degassing treatment, splicing the graphite theoretical casting molds, and carrying out vacuum inclined centrifugal casting, so as to obtain the graphite titanium alloy casting. According to the casting technological method, fall flow of molten titanium can be effectively relieved, the purpose that molten titanium sequentially solidifies is achieved, besides, inner shrinkage cavity defects of the casting are eliminated through feeding of centrifugal force, flow mark defects of the surface of the casting can be decreased as well, product quality of the titanium alloy casting is integrally improved, follow-up welding repairing trimming is reduced, the production cycle of a product is shortened, and production cost is reduced.

Description

technical field [0001] The invention relates to the field of titanium alloy casting, in particular to a casting process method for a graphite-type titanium alloy casting. Background technique [0002] There are currently two relatively mature production methods for machining graphite-type titanium alloy castings, one is gravity casting (static casting), and the other is centrifugal casting. [0003] Conventional gravity casting is a casting process in which the molten metal flows into the machined graphite mold in a static state through its own gravity. Due to the structure of the casting, the design of the runner will inevitably cause turbulent flow of the molten metal in the cavity due to the large height drop, which will cause the surface of the casting to Flow marks are formed, and the large drop will also cause the molten metal to solidify too quickly, resulting in uneven solidification, which cannot achieve sequential solidification and form shrinkage cavity defects; c...

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Problems solved by technology

[0003] Conventional gravity casting is a casting process in which the molten metal flows into the machined graphite mold in a static state through its own gravity. Due to the structure of the casting, the design of the runner will inevitably cause turbulent flow of the molten metal in the cavity due to the large height drop, which will cause the surface of the casting to Flow marks are formed, and the large drop will also cause the molten metal to solidify too quickly, resulting in uneven solidification, which cannot achieve sequential solidification and form shrinkage cavity defects; centrifugal casting is to rotate the graphite mold by mechanical means, and the molten metal is directly poured into the rotating graphite The casting mold makes it fast filling, reduces the heat energy loss during the casting process, and reduces the difference in superheat, thereby reducing the formation of shrinkage cavities. At the same time, centrifugal casting can also refine the grains and improve the quality of castings. As the centrifugal force increases, the linear velocity of the molten metal in the mold increases compared to the linear velocity of gravity casting. The impact of the molten metal on the inner wall of the graphite cavity may cause defects in graphite slag inclusions inside the casting, and the acceleration of the flow velocity may also cause graphite The more serious turbulent flow of molten metal in the cavity will cause flow marks on the surface of the casting and reduce the quality of the casting

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