A Method for Calculating Theoretical Thickness of Layup Based on Automatic Laying Technology

Abstract

A method for measuring and calculating the theoretical thickness of layers based on automatic wire laying technology, including the following steps: extracting the molded surface of the part to be formed, and representing the molded surface with a point cloud; according to the theoretical trajectory of the wire laying program, in the first laying Extract the centerline of each tow on the layer, and extract all the centerlines on the subsequent layer in turn; for any layer, find the perpendicular line between any point of the point cloud and any centerline on the layer, and the length of the perpendicular line; According to the calculated distance between the point and the center line, determine whether the point falls in the prepreg coverage area, and judge each point of the point cloud in turn, screen out the points that fall in the prepreg coverage area, and remove the points that fall in the prepreg coverage area. Points outside the area covered by the dipping material, the new point cloud is used to express the theoretical thickness of the layup; analyze all the layups, superimpose the point cloud representing the theoretical thickness of each layer, count the repeated points, and perform calculation according to the counting results Coloring, the count size corresponds to different color spectrums to express the final full-ply theoretical thickness.

Description

technical field [0001] The invention relates to the field of automatic wire laying, in particular to a method for calculating the theoretical thickness of a layup based on the automatic wire laying technology. Background technique [0002] The full name of the composite automatic laying technology is the automatic tow laying technology ATP (Automated TowPlace-ment), also known as the fiber laying technology (FiberPlacement). Automatic wire laying technology was proposed in the 1970s as a reform of winding and tape laying technology, aiming to overcome the "periodic, stable and non-overhead" aspects of winding technology and the "natural path" that automatic tape laying must follow. For the manufacture of composite fuselage structures, the core technology is the design and development of multi-filament tow placement heads and the development of corresponding material systems. Boeing and Hercules began to develop automatic wire laying technology in 1982, including equipment d...

AI Technical Summary

Problems solved by technology

[0004] The traditional thickness measurement method is to use ultrasound and other means to measure the composite material after curing. There is no way to characterize the theoretical thickness before curing. It can only rely on the experience of programmers to avoid overlapping triangles and achieve the theoretical thickness as much as possible. This method There are problems such as large errors and repeated trial and error

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