Reverse control method of hollow turbine blade wall thickness deviation based on ceramic core positioning compensation

A technology of turbine blades and ceramic cores is applied in the field of reverse regulation of wall thickness deviation of hollow turbine blades based on positioning compensation of ceramic cores, which can solve problems such as excessive wall thickness of hollow turbine blades, improve the qualification rate and service life, and improve matching. relationship, the effect of precise control

Active Publication Date: 2022-05-20
SHANXI UNIV
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Problems solved by technology

[0004] Aiming at the current hollow turbine blade precision casting process due to insufficient ceramic core limit and non-uniform deformation of the shell caused by ceramic core position and posture drift, and then resulting in the problem of hollow turbine blade wall thickness out of tolerance, the present invention provides a ceramic core based Reverse control method of hollow turbine blade wall thickness deviation based on positioning compensation

Method used

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  • Reverse control method of hollow turbine blade wall thickness deviation based on ceramic core positioning compensation
  • Reverse control method of hollow turbine blade wall thickness deviation based on ceramic core positioning compensation
  • Reverse control method of hollow turbine blade wall thickness deviation based on ceramic core positioning compensation

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Embodiment Construction

[0050] figure 1 It is the preferred example of the hollow turbine blade of the aero-engine in the present invention, and its length and width are respectively: 138.7mm and 72.9mm.

[0051] In the following, the hollow turbine blade wall thickness deviation reverse regulation method based on ceramic core positioning compensation proposed by the present invention will be described in detail in combination with the example of the hollow turbine blade.

[0052] 1) Obtain the data of the inner and outer contour points of the actual hollow turbine blade

[0053] Use industrial CT to scan the critical section of the actual hollow turbine blade with wall thickness deviation. Among them, the key section is the five sections located at the blade edge curve with the largest curvature value and perpendicular to the direction of the blade stacking axis, such as figure 2 Shown; Afterwards, the inner and outer contour points of the leaf were extracted from the scanned grayscale image, and ...

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Abstract

The invention belongs to the technical field of investment casting precision casting of hollow turbine blades of aero-engines, and in particular relates to a reverse regulation method for wall thickness deviation of hollow turbine blades based on ceramic core positioning compensation. It includes the following steps: 1) Obtaining the data of the inner and outer contour points of the actual hollow turbine blade; 2) Three-dimensional iterative registration of the blade contour points and the design model; 3) Calculating the position and attitude drift of the ceramic core during the precision casting process; 4) Calculating the reverse direction of the ceramic core Offset; 5) Reverse offset ceramic core design model; 6) Adjust the size of the positioning element of the wax-type mold ceramic core. The invention aims at the serious problem of out-of-tolerance wall thickness and size of the hollow turbine blades of aero-engines. From the perspective of pottery core position and posture regulation, by adjusting the size of the ceramic core positioning components inside the wax-type mold, the space position and posture of the ceramic core inside the wax-type mold is changed, thereby forming " The "eccentric core" wax pattern finally achieves the purpose of improving the position matching relationship between the shell and the ceramic core, and realizing the precise control of the wall thickness accuracy of the hollow turbine blade.

Description

technical field [0001] The invention belongs to the technical field of investment casting precision casting of hollow turbine blades of aero-engines, and in particular relates to a reverse regulation method for wall thickness deviation of hollow turbine blades based on ceramic core positioning compensation. Background technique [0002] Hollow turbine blades are the core hot-end parts of aero-engines, and their forming accuracy has a direct impact on engine performance and life. At present, the shape accuracy of hollow turbine blades is mainly evaluated from two aspects: outline and wall thickness. Among them, wall thickness accuracy is a key indicator to ensure blade strength and cooling efficiency. However, judging from the implementation and application in the industry, at present, the wall thickness of the hollow turbine blade is seriously out of tolerance, and the pass rate is low. The leading cause of fatigue failure. Therefore, it is of great significance to study t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F30/17G06T17/00
CPCG06T17/00Y02E10/20
Inventor 崔康
Owner SHANXI UNIV
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