Wax mold manufacturing method for closed centrifugal impeller

Abstract

The invention discloses a method for manufacturing a max mold for a closed centrifugal impeller. The method comprises the following steps: a, designing a closed centrifugal impeller wax mold, and uniformly dividing the closed centrifugal impeller wax mold into a plurality of wax mold units along the axial thickness of the closed centrifugal impeller wax mold; b, sealing an air flow channel part, and performing overall mold filling on all air flow channels by using a ring-shaped ceramic mold core group; c, performing pressing molding on different wax mold units according to size design; d, assembling the wax mold units at two ends of the ring-shaped ceramic mold core group in sequence in the axial direction, and sealing joint seams; and e, checking adhesion parts of wax mold units and / or wax mold units and the ring-shaped ceramic mold core group, and removing excessive wax on the surface, thereby forming the closed centrifugal impeller wax mold. The closed centrifugal impeller wax mold manufactured by using the method disclosed by the invention is free of problem such as mold core breakage and wax mold shrinkage deformation, and the wax mold is simple and convenient in pressing molding and high in pass percent.

Description

technical field [0001] The invention relates to the technical field of precision casting of aero-engine parts, in particular to a wax mold manufacturing method for a closed centrifugal impeller. Background technique [0002] The closed centrifugal impeller is one of the key parts of the gas turbine and the key and core part of the centrifugal compressor of the gas turbine, which has a direct impact on the performance and structural integrity of the gas turbine. [0003] The blank of the closed centrifugal impeller has 22 closed air flow passages, and it is a one-time casting. The blank is produced by investment casting. In order to obtain 22 closed air flow channels, the air flow channels are mainly filled with ceramic cores. [0004] Using ceramic cores to form the airflow channel, the main process is: use ceramic core molds to press 22 individual ceramic cores, assemble the 22 individual ceramic cores into a whole ring through the assembly fixture, and then put the whole ...

AI Technical Summary

Problems solved by technology

[0006] The invention provides a wax mold manufacturing method for a closed centrifugal impeller to solve the problem that the closed centrifugal impeller wax mold uses a ceramic core to fill the air flow channel, and the ceramic core is easily damaged during the process of pressing the wax mold, resulting in the entire Castings are scrapped; thickness differences easily lead to technical problems of shrinkage and deformation

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