Surface Array Microstructure Laser Machining Method of Point Cloud Describing Curved Surface Workpieces

Abstract

The invention provides a surface array microstructure laser processing method for a curved surface workpiece described by a point cloud, comprising: using a reverse engineering method to measure and model the shape of a free curved surface workpiece to be processed, and to design graphics for the surface array microstructure based on the point cloud described curved surface Layout; then plan the laser etching processing path for the design graphics, adjust the spatial orientation of the laser processing head relative to the free-form surface workpiece according to the tangent plane where the processing path is located, the geometric center point, and the corresponding external normal vector, so that the laser beam is along the normal direction Shoot to the free-form surface workpiece, and perform laser etching of geometric lines one by one. The layout design of the surface array microstructure graphics of the present invention has nothing to do with the curvature distribution and change of the free-form surface, and is compatible with various types of free-form surfaces. The calculation scale is stable and convergent, and the layout efficiency is high; the surface array microstructure is completely eliminated. The layout and processing errors of the graphics ensure the accuracy and stability of the laser etching process quality.

Description

technical field [0001] The invention belongs to the technical field of laser processing, and in particular relates to a surface array microstructure laser processing method for a curved surface workpiece described by a point cloud. 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 tha...

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