A mortise-and-tenon combined pouring system for high-temperature alloy thin-walled parts and its manufacturing method

Abstract

The invention relates to the field of high-temperature alloy thin-wall precision casting for aero-engines, and specifically relates to a mortise-and-tenon combined pouring system and a manufacturing method for high-temperature alloy thin-walled parts. The specific scheme is to design a special tenon-tenon combined pouring system according to the actual situation of the casting Forming the sprue, and adopting measures such as supporting the wax mold with an inner gate, thereby reducing metallurgical defects such as porosity and improving the pass rate of castings.

Description

technical field [0001] The invention relates to the field of high-temperature alloy thin-wall precision casting for aero-engines, in particular to a mortise-and-tenon combined pouring system and a manufacturing method for high-temperature alloy thin-wall parts. Background technique [0002] The structural characteristics of the superalloy thin-walled parts of the tail nozzle of the aero-engine are complex grid-shaped and multi-rib thin-walled parts, which is not conducive to the sequential solidification of the castings. At the same time, the manual splicing and combination of wax patterns brings large random quality fluctuations. Casting and processing are difficult, and conventional metallurgical defects such as porosity are prone to occur. Due to the large outline size of thin-walled parts, the deformation of wax patterns is not easy to control, which ultimately leads to difficulty in guaranteeing the geometric dimensions of castings, and there are random deformations and ...

AI Technical Summary

Problems solved by technology

[0002] The structural characteristics of the superalloy thin-walled parts of the tail nozzle of the aero-engine are complex grid-shaped and multi-rib thin-walled parts, which is not conducive to the sequential solidification of the castings. At the same time, the manual splicing and combination of wax patterns brings large random quality fluctuations. Casting and processing are difficult, and conventional metallurgical defects such as porosity are prone to occur. Due to the large outline size of thin-walled parts, the deformation of wax patterns is not easy to control, which ultimately leads to difficulty in guaranteeing the geometric dimensions of castings, and there are random deformations and poor dimensional consistency. It is very difficult to calibrate the grid shape and multi-rib thin-walled parts

The casting master alloy is K424 high-temperature alloy, which has a series of advantages such as high strength, oxidation resistance and high-temperature structure stability, and can meet the special requirements of high-temperature load-bearing and ablation resistance of the expansion nozzle regulator. The window is narrow, prone to metallurgical defects such as looseness, and the bottom plate and crossbar of the casting are greatly deformed, which cannot well meet the requirements of machining and subsequent assembly

[0003] By combing the quality of castings and parts after machining, it is found that the regular metallurgical defects of scrapping are loose as the middle part of the two inner gates of the long rod. After the coating is made into the shell, this position is filled and closed by slurry. Insufficient heat dissipation is prone to loose metallurgical defects. The loose parts of the casting 1 are as attached to the instruction manual. figure 1 As shown; attached to the instruction manual figure 2 As shown, since the wax mold has a certain amount of deformation during cooling and shrinkage after the mold is released, and the two cross bars are suspended during the placing process, it is easy to cause deformation

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