Method for laser machining workpieces

By forming a predetermined processing line on the material and forming spaced material modified parts with processing beams, the problem of difficult material crack direction control is solved, and high-quality material separation and smooth separation surfaces are achieved.

CN119731130AActive Publication Date: 2025-03-28TRUMPF (CHINA) CO LTD
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Patent Information

Application Number
CN202280098630.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2022-05-26
Publication Date
2025-03-28
Estimated Expiration
2042-05-26

AI Technical Summary

Technical Problem

The prior art is difficult to effectively control the formation direction and separation quality of cracks of materials during laser processing, resulting in unsmoothing material separation surface and may cause damage to the workpiece section.

Method used

By forming a predetermined processing line on the material by processing the beam, spaced material modification parts are formed one by one along the line time, the distance between adjacent material modification parts is controlled to ensure that the preferred direction of the crack is substantially parallel to the processing line.

Benefits of technology

The formation of approximately parallel cracks in the material is achieved, the smoothness and separation quality of material separation is improved, damage to the workpiece section is reduced, and the strength of the glass edge is improved.

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Abstract

The invention relates to a method for laser machining a workpiece (104) by means of a machining beam (114), the workpiece (104) comprising a material (102) which is transparent to a wavelength lambda of the machining beam (114), in which method a material modification (142) is formed in the material (102) along a predetermined machining line (134) by the action of the machining beam (114) on the material (102), in the method, a first group (144a) of spaced apart material modifications (142) is formed in the material (102), mutually adjacent material modifications (142) of the first group (144a) are formed one after the other in time and have a distance (d0) of at least 0.25 * lambda and / or at most 2.5 * lambda from one another, and in the method, a second group (144b) of spaced apart material modifications (142) is formed in the material (102) and has a distance (d0) of at least 0.25 * lambda and / or at most 2.5 * lambda from one another. Adjacent material modifications (142) of the second group (144b) are formed one after the other in time and have a distance (d0) of at least 0.25 * lambda and / or at most 2.5 * lambda from one another, and the shortest distance (d1) between the material modifications (142) of the first group (144a) and the material modifications (142) of the second group (144b) is at least 5 [mu] m.
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