Laser multi-focus dynamic machining method and system

Abstract

The invention discloses a laser multi-focus dynamic machining method and system, and belongs to the technical field of laser machining application. The method includes the steps that multiple same-optical-axis focus points incoming into a to-be-machined object do back and forth movement at set frequency along the direction of the optical axis, and therefore each laser focus does linear back and forth movement in the thickness direction of the to-be-machined object, and therefore the static point heating manner is converted into linear dynamic heating manner. The invention further provides a device for achieving the above method. A multi-focus derivative system or multi-focusing-lens set is adopted for enabling lasers to form multiple laser focuses in the to-be-machined transparent material. By means of the method, high quality and high efficiency cutting separation of the thicker transparent fragile material can be achieved. The device is relatively simple in structure and easy to control.

Description

technical field [0001] The invention belongs to the technical field of laser processing applications, and in particular relates to a laser multi-focus dynamic processing method and system. Background technique [0002] When laser cutting and separating transmissive brittle materials, laser thermal crack control method is usually used. The principle of cutting and separation is: using the high absorption rate of a transparent material for a laser beam to form a surface to absorb laser light energy, heating the surface of a transparent brittle material, or using the characteristics of a low absorption rate of a transparent brittle material for a certain laser beam to make the laser The beam runs through the entire transparent and brittle material, forming a body to absorb the laser light energy, and heating the transparent and brittle material as a whole. The heated part of the material forms a larger compressive stress due to expansion. With the movement of the laser beam, ...

AI Technical Summary

Problems solved by technology

[0008] However, this method also requires an increase in the number of static laser focal points as the thickness of the material increases, resulting in an increase in the number of focusing lenses in the multi-focus lens group. The laser energy loss increases due to absorption. On the other hand, with the increase in the number of focusing lenses, it not only increases the difficulty of design and production, but also increases the cost sharply. Moreover, the error of making each lens will also lead to an increase in the cumulative error of the multi-focus lens group. , which increases the error of each focus position and the difficulty of adjusting the same optical axis of each focusing film

[0009] Therefore, it is necessary to develop a new type of laser multi-focus dynamic processing method and system to overcome the problem of cutting and separating thicker transparent brittle materials in the prior art

Images