Curved surface workpiece surface array microstructure graph layout method

Abstract

The invention provides a curved surface workpiece surface array microstructure graph layout method. The method includes the following steps that the boundary dimension of the surface of a free curved surface workpiece is measured through a reverse engineering method, and a reconstructed curved surface is obtained; the reconstructed curved surface is divided into a plurality of curved surface equilateral triangles distributed in a seamless mode; the vertex coordinates Pi of all the nonredundant curved surface equilateral triangles are recorded, and the tangent planes Ki and the outer-normal vectors Vi of the positions of the reconstructed curved surface where the Pi is located are worked out; in all the tangent planes Ki or the planes parallel to the tangent planes Ki, the Pi points corresponding to the tangent planes Ki serve as the geometric center points, design graphs Gi of a unit microstructure are correspondingly distributed, and the requirement that the inclined angles between the same corresponding feature edge line of the design graphs of all the tangent planes and the projection lines of space benchmark vectors in the Ki are fixed values respectively is met. According to the curved surface workpiece surface array microstructure graph layout method, the calculation scale is stable, convergence is maintained, layout efficiency is high, and the layout and machining error of the surface array microstructure graphs can be completely eliminated.

Description

technical field [0001] The invention belongs to the technical field of laser processing, and in particular relates to a layout method for array microstructure graphics on the surface of a curved workpiece. Background technique [0002] In the field of mechanical industry and electronic industry, it is often necessary to prepare array microstructures on the surface of the formed free-form surface workpiece. Microstructure refers to the tiny topological shape of the surface with a surface shape accuracy of submicron level and surface roughness of nanometer level with specific functions. The most important feature of microstructure is the functionality of its structure. For example, the surface structure of microstructure surface optical components determines the reflection, transmission or diffraction performance of light, which is convenient for optical designers to optimize the optical system, reduce weight and reduce volume. Another feature is that they generally have a la...

AI Technical Summary

Problems solved by technology

The first method is to conduct offline virtual design based on the theoretical workpiece model and then process the actual workpiece online. However, since any free-form surface workpiece has machining tolerances during the processing of its free-form surface shape, this method does not consider the actual workpiece. The error between the external dimension and the theoretical workpiece model, the processing error is large

The second method is to conduct offline virtual layout and design based on surface array microstructure graphics, and then process the actual workpiece online. There are large deviations in both layout and processing