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
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[0043] Please refer to figure 2As shown, the diameter of the round bolt through hole before the improvement is defined as a . The maximum longitudinal profile of the profiled hole profile is a, the maximum lateral profile is b, and a≤b is required. The geometric contour of the multi-arc special-shaped hole is composed of eight smooth and tangent arcs. The outline of the specified hole is symmetrical about the Y axis, and the eight arcs are 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 dashed line is the outline of the base circle in the original design, and the outline of the eight-segment arc special-shaped hole is determined by a total of 5 radial dimens...
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