Surface Array Microstructure Arrangement Method for Point Cloud Describing Curved Surface Workpieces

Abstract

The invention provides a surface array microstructure arrangement method of a point cloud described curved surface workpiece, comprising: adopting a reverse engineering method to measure the external dimensions of the surface of a free curved surface workpiece to obtain a point cloud described curved surface; on the point cloud described curved surface, finding several vertex, add it to the vertex set; calculate the tangent plane Kt and the external normal vector Vt of the position of the point cloud describing the surface position of all points Pt in the vertex set; choose a space reference vector arbitrarily; on all tangent planes Kt, use its corresponding The Pt point of Pt is the geometric center point, which corresponds to the design graph Gt of a unit microstructure, and satisfies the angle between the same corresponding feature edge of the design graph on all tangent planes and the projection line of the spatial reference vector on Kt are fixed values. The point cloud described in the present invention describes the surface array microstructure arrangement method of curved surface workpieces with small processing error, compatible with various types of free curved surfaces, stable and convergent calculation scale, and high layout efficiency.

Description

technical field [0001] The invention belongs to the technical field of laser processing, and in particular relates to a method for arranging surface array microstructures of curved workpieces described by point clouds. 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 genera...

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