A gating system for hollow single crystal blades

Abstract

The invention discloses a pouring system for a hollow single crystal blade, comprising a sprue cup, a feeding rectangular block, a blade wax piece, a seeding section, a disk and a sprue, the sprue and the seeding section They are respectively installed vertically on the disc, the upper end of the sprue is connected with the sprue cup through the ceramic filter, and the lower end is connected with the seeding section through the inner runner, and the seeding section is connected with the lower end of the blade wax part through the spiral crystal selector. The upper end of the blade wax part communicates with the feeding rectangular block, and the feeding rectangular block communicates with the upper part of the sprue cup through the slag collecting vent hole, and the upper end of the blade wax part is also provided with a feeding riser. The gating system of the present invention has a reasonable structure, which reduces the scrapping rate of inclusions, looseness, miscellaneous crystals, high-angle grain boundaries, small-angle grain boundaries, zebra crystals, and crystal orientation deviations of single crystal blades, greatly improves the product qualification rate, and reduces economic costs. Loss, shorten the development cycle, ensure timely delivery of blades, and can be widely promoted and applied in the field of investment precision casting technology.

Description

technical field [0001] The invention relates to a pouring system for hollow single-crystal blades, which belongs to the technical field of investment precision casting. Background technique [0002] The working blade of a certain turbine is a complex air-cooled hollow single crystal blade, and its shape is composed of a blade body, a mounting plate, an extension and a tenon. Among them, the thickness of the leaf body wall varies greatly, the thickest is 3.5mm, and the thinnest is 0.5mm. In the casting process of this type of turbine working blades, a top pouring gating system is usually used. The gating system is composed of a sprue cup, an upper disc runner, a support rod and a crystal selector. Blades cast using this gating system are prone to inclusions. , loose, miscellaneous crystals, high-angle grain boundaries, small-angle grain boundaries, zebra crystals, and crystal orientation deviations cannot meet the technical requirements. The casting scrap rate is over 95%, a...

AI Technical Summary

Problems solved by technology

This type of turbine working blade usually adopts top pouring gating system in the casting process. , loose, miscellaneous crystals, large-angle grain boundaries, small-angle grain boundaries, zebra crystals, and crystal orientation deviations cannot meet the technical requirements. The casting scrap rate is over 95%, and the pass rate is less than 5%, resulting in a large number of blade scrapping, resulting in huge economic loss, while the development cycle is extended, and the blades cannot be delivered on time

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