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Multi-arc specially-shaped hole

A technology of special-shaped holes and arcs, which is applied in the direction of supporting elements of blades, engine elements, machines/engines, etc., to achieve the effect of improving service life and reducing stress concentration

Active Publication Date: 2013-10-02
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0007] The invention provides a multi-arc special-shaped hole, which effectively solves the stress concentration phenomenon of the existing engine turbine disk, the bolt hole on the compressor disk, the pressure equalization hole and other hole structures, and improves the service life of the structure.

Method used

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Embodiment Construction

[0043] Please refer to figure 2As shown, the diameter of the circular bolt hole before improvement is defined as a . The maximum longitudinal profile of the special-shaped hole profile is a, the maximum transverse profile is b, and a≤b is required. The geometric profile of multi-arc shaped holes is composed of eight smooth and tangent arcs. It is stipulated that the contour of the hole is symmetrical about the Y axis, and the eight arcs are respectively a top main arc R1 (R1 is the radius), a bottom main arc R2 (R2 is the radius), and two side main circles that are symmetrical about the Y axis Arc R3 (R3 is the radius), two upper transition arcs R4 (R4 is the radius) symmetrical about the Y axis, and two lower transition arcs R5 (R5 is the radius) symmetrical about the Y axis.

[0044] figure 2 The outline of the middle dotted line is the outline of the base circle in the original design, and the outline of the eight-segment arc shaped hole is determined by a total of 5 ...

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Abstract

A multi-arc specially-shaped hole comprises a largest lengthwise outline a and a largest crosswise outline b, wherein the largest lengthwise outline a is smaller than or equal to the largest crosswise outline b. The geometric outline of the multi-arc specially-shaped hole is formed by eight arcs which are tangent smoothly. The eight arcs comprise a top portion main arc with radius R1, a bottom main arc with radius R2, two side main arcs with radius R3 which are symmetrical about the Y axis, two upper transition arcs with radius R4 which are symmetrical about the Y-axis and two lower transition arcs with radius R5 which are symmetrical about Y-axis. The multi-arc specially-shaped hole effectively solves the problems of stress concentration of hole structures such as bolt holes and pressure equalizing holes in an existing engine turbine disc and an existing compressor disc, and the service life of the structure can be prolonged.

Description

technical field [0001] The invention relates to a hole structure such as a bolt hole, a pin hole, a vent hole and the like used in an aeroengine rotor structure, in particular to a multi-arc shaped hole. Background technique [0002] Bolt holes, pin holes, and vent holes are common structures on the aero-engine wheel, and their weakening of the load-bearing capacity of the wheel will reduce the overall strength of the structure. At the same time, because the cross-section of the existing hole is circular, serious stress concentration will occur when bearing multi-axial loads with different stress values ​​in all directions, which will lead to radial crack failures and have a significant impact on the life of the wheel. [0003] In the design and manufacture of the engine, for the stress concentration problem of the pressure equalization holes and bolt holes on the wheel disc, technological measures such as hole edge chamfering and polishing are often adopted to reduce the da...

Claims

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Application Information

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IPC IPC(8): F01D5/02
Inventor 郭海丁陈秋任张超王佳
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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