Wax mold for precision casting of closed centrifugal vane wheel and wax mold manufacturing method

Abstract

The invention discloses a wax mold for precision casting of a closed centrifugal vane wheel. The wax mold comprises a base plate used for supporting and positioning of the whole mold, the base plate is provided with a lower mold used for forming of a bottom wax mold, a combined mold core used for overall mold filling of all air current channels and a combined upper mold used for forming of an upper wax mold and a lateral wax mold, and a wax mold containing cavity used for enabling the wax mold to be injected and forming the wax mold is formed by the lower mold, the combined mold core and the combined upper mold in an enclosing manner; and the combined mold core is of a complete ring-shaped structure which is formed by closely splicing multiple mold core units used for mold filling of single air current channels in the ring circumferential direction, and the combined mold core is formed by splicing the mold core units through a centering and positioning mechanism used for centering and positioning of the mold core units. Assembling, inspecting and replacing of the whole wax mold and the pressing technology and positioning of the wax mold are reliable, replacing operation of the mold core units is simple and easy to carry out, the difficulty of the wax mold manufacturing technology is greatly reduced, the technological steps of additionally making a mold core positioning fixture and integrally moving the mold core are omitted, and the technological efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of precision casting of aero-engine parts, in particular to a wax mold for precision casting of closed centrifugal impellers. In addition, the invention also relates 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. The working speed of this kind of parts is extremely high (20000r / min to 40000r / min), and it is necessary to compress the air to the design pressure under the condition of strong centrifugal load and other mechanical forces and complex aerodynamic forces, while having high efficiency . [0003] The closed centrifugal impeller has a closed air flow channel with a complex surface, and the 22 closed air flow cha...

AI Technical Summary

Problems solved by technology

[0006] The invention provides a wax mold and a wax mold manufacturing method for precision casting of a closed centrifugal impeller to solve the problem that the wax mold of a closed centrifugal impeller needs to be repositioned because the soluble core is assembled on the outside. The technical problem that it is easy to cause the breakage and damage of the soluble core during the core

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