Method for projection-type laser etching on free curved surface

Abstract

The invention discloses a method for projection-type laser etching on a free curved surface. By combining a laser galvanometer as well as a triaxial coordinate positioning technology and adopting the principles of partitioned parallel projection as well as height mapping, the invention directly conducts precise surface laser etching on the basis of a discrete point cloud model of a free curved surface part. The method has the characteristic that the laser etching properties such as the shape and size of a spot and the energy distribution remain unchanged within the focal depth range of a focusing lens, so that the free curved surface is converted into a plurality of plane subblocks for processing, and the high-precision processing efficiency of the free curved surface can be improved even by adopting the existing laser etching technology. The diameter of the focusing spot of a laser beam can reach tens of microns and is much smaller than the size of the part processed by a traditional knife tool; and the processing precision of nearly 10 microns can be realized by controlling the laser energy property. Under the premise of meeting the demands for high precision and high efficiency of pattern etching on the free curved surface, the method can realize high reliability and high flexibility in the processing of the free curved surface.

Description

technical field [0001] The invention belongs to the technical field of laser ultra-precision machining and free-form surface parts manufacturing, and relates to a precision etching processing method on the surface of free-form surface parts. Background technique [0002] In the field of machinery industry and electronic industry, it is often necessary to carry out precision etching on the surface of the formed free-form surface parts, such as engraving three-dimensional texture patterns or etching dense shallow grooves on the surface of the surface, which can obtain beautiful, wear-resistant or special Electromagnetic properties and other effects. However, since the free-form surface is an irregular, non-revolving, and non-developable surface, it is generally difficult to accurately describe it with mathematical equations. It is usually described by a series of discrete value points, that is, a discrete point cloud model. Among them, the point cloud data can be obtained dir...

AI Technical Summary

Problems solved by technology

This method relies on the 3D CAD model, and cannot directly process the surface of the existing part based on the discrete point cloud model of the free-form surface part.

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