High-temperature alloy thin-walled workpiece tenon-and-mortise combined type pouring system and manufacturing method

Abstract

The invention relates to the field of aero-engine high-temperature alloy thin-wall precision casting, in particular to a high-temperature alloy thin-wall part tenon-and-mortise combined type pouring system and a manufacturing method. According to the specific scheme, measures that a special tenon-and-mortise combined type pouring system forming pouring gate is designed according to the actual condition of a casting, and a supporting effect is achieved in a manner that a wax mold is provided with a flow gate are taken, so that metallurgical defects such as looseness are reduced, and the yield of the casting is increased.

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 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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