Pouring system for hollow single crystal blade

Abstract

The invention discloses a pouring system for a hollow single crystal blade. The pouring system comprises a pouring cup, rectangular feeding blocks, blade wax pieces, crystal guide sections, a disc and a sprue. The sprue and the crystal guide sections are perpendicularly mounted on the disc. The upper end of the sprue is communicated with the pouring cup through a ceramic filter net. The lower end of the sprue is communicated with the crystal guide sections through ingates. The crystal guide sections are communicated with the lower ends of the blade wax pieces through spiral crystallizers. The upper ends of the blade wax pieces are communicated with the rectangular feeding blocks. The rectangular feeding blocks are communicated with the upper portion of the pouring cup through slag collecting gas vents. Feeding heads are further arranged at the upper ends of the blade wax pieces. The pouring system is reasonable in structure, the probability of inclusions, loosening, mixed crystals, a high-angle boundary, a low-angle boundary, zebra crystals and a crystal orientation deviation scrap rate of the single crystal blade is reduced, the product percent of pass is greatly increased, economic losses are reduced, the developing cycle is shortened, on time delivery of the blade is ensured, and the pouring system can be widely applied and popularized in the technical field of melted module precise casting.

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

Images