Beam splitting double-focus-point laser processing head

Abstract

The invention provides a beam splitting double-focus-point laser processing head, which comprises a light path cavity, a cavity connecting box, a servo motor and an external connecting flange, wherein the light path cavity is connected with an output shaft of the servo motor through a shaft coupler, a beam splitting mirror, a first reflecting mirror, a second reflecting mirror, a third reflecting mirror, a focusing mirror and two telescopic sleeves are arranged inside the light path cavity, the beam splitting mirror and the first reflecting mirror are respectively and fixedly arranged on the side wall of the light path cavity through a regulating mirror seat, the second reflecting mirror and the third reflecting mirror are respectively arranged on the telescopic ends of the two telescopic sleeves through a regulating mirror seat, and the fixing ends of the telescopic sleeves are arranged on the side wall of the light path cavity. The beam splitting double-focus-point laser processing head has the advantages that an incident laser beam is subjected to space beam splitting, the front focusing point and the back focusing point are realized, the relative space position between the double light beam focusing points is changed, the utilization efficiency of laser energy is improved, the laser welding plasma shielding effect can be effectively inhabited, the processing depth is improved, and the laser processing quality is improved.

Description

technical field [0001] The invention belongs to the field of laser processing, and in particular relates to a beam-splitting double-focus point laser processing head. Background technique [0002] At present, with the continuous development of commercial high-power lasers, the power density of fiber laser welding can reach 10 6 -10 8 W / cm 2 , Compared with the traditional thick plate welding technology, fiber laser welding has the advantages of high speed and extremely small post-weld deformation. However, the process of high-power fiber laser welding thick plates is relatively complicated, and the small holes produced during welding are extremely unstable, and welding defects such as spatter, surface collapse, and bottom hump are prone to occur, which not only affects the appearance of the weld, but also affects the mechanical properties of the weld. [0003] Laser welding is to join two or more solid materials in a local area with limited space, so that the workpiece is...

AI Technical Summary

Problems solved by technology

If the molten pool is too large or too small, or if the evaporation is serious, it will lead to the failure of welding

In addition, the final quality of the weld may also deteriorate due to changes in other factors, such as evaporation of alloy components, excessive temperature gradients (causing hot cracks), and instability of weld pool volume and geometry (causing porosity and holes) etc.

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