Method for projection-type laser etching on free curved surface

A laser etching method and free technology, applied in laser welding equipment, metal processing equipment, welding equipment, etc., can solve the problem of inability to perform secondary processing, and achieve the effect of low equipment cost and simple process

Active Publication Date: 2010-07-28
武汉飞能达激光技术有限公司
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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.

Method used

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  • Method for projection-type laser etching on free curved surface
  • Method for projection-type laser etching on free curved surface

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Embodiment Construction

[0020] The projection-type laser etching method on the free-form surface provided by the present invention adopts a general-purpose "3+2" axis CNC laser processing machine tool, and the machine tool includes an XYZ three-axis motion positioning mechanism and a two-axis laser galvanometer scanning device. The sub-block positioning is realized through the XY two axes, and the Z-axis moving mechanism cooperates with the laser vibrating mirror to perform sub-block projection processing. The method includes the following steps:

[0021] (1) Establish a discrete point cloud model of the free-form surface part surface in the XYZ rectangular coordinate system. The point cloud data either directly comes from converting the 3D solid model of the computer-aided design (CAD) free-form surface part into a point cloud data type, or from Point cloud data obtained by reverse engineering measurement of existing free-form surface parts;

[0022] (2) Divide the graphics or patterns to be etched ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/00B23K26/362
Inventor 曹宇曾晓雁段军
Owner 武汉飞能达激光技术有限公司
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