Digital detecting method of bending angle of sheet metal part

Abstract

The invention provides a digital detecting method of the bending angle of a sheet metal part. The digital detecting method includes: building the point-cloud model C<D> of the appearance face of a part design model, extracting the bent edge base line L<IW> of the part design model, and building a normal plane, a point-cloud model split surface S<S> and a point-cloud model split plane F<S>; cutting and aligning the scanning point-cloud model C<O> of a formed part to obtain a point-cloud model C<MA>, splitting the point-cloud model C<MA>, and allowing the split point-cloud model to intersect with the normal plane Fi<NL> to obtain a point-cloud section coordinate set; respectively fitting the point-cloud coordinate set of a web-area section point-cloud model Ci<IW> and the point-cloud coordinate set of a bent-edge-area section point-cloud model Ci<IF> into straight lines, calculating the included angle of the two straight lines, calculating the bending angle of the formed part, and comparing bending angle with the bending of the design model to obtain the bending angle deviation of the formed part. The digital detecting method digitally detects the bending angle of the bending edge of the sheet metal part, can precisely the sheet metal part and can achieve batch detection of sheet metal parts.

Description

technical field [0001] The invention relates to a digital detection method for the bending angle of an edge-like sheet metal part, which belongs to the technical field of aircraft manufacturing. Background technique [0002] Frame-rib sheet metal parts are mainly used as secondary force-bearing parts in aircraft fuselage and wings. Frame-rib sheet metal parts are of different sizes and complex shapes. Frame rib parts are composed of flanges and webs. The web surface is generally kept flat, and there are flanges with different bending angles and heights distributed around the contours. The flanges generally have three forms: straight lines, convex curves, and concave curves. . Bends generally have variable curvature and variable bending angles. The flanges of frame rib parts are generally overlapped with structural parts such as long trusses and skins, which together constitute the aerodynamic shape of the aircraft, and the bending angle of the flanges is an important facto...

AI Technical Summary

Problems solved by technology

[0003] In engineering, the bending angle of frame-rib sheet metal parts is generally detected by the method of angle ruler measurement, and there is a certain measurement error; for variable bending angle bending, the angle deviation of a certain section position cannot be accurately determined, and the detection of such parts requires Inspection personnel with high inspection experience conduct inspection; angle ruler measurement cannot effectively collect product data, and a large amount of empirical data cannot be applied to the forming process design of subsequent products, resulting in a waste of process resources

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