Double-laser composite cutting high-precision drilling method

Abstract

The invention provides a double-laser composite cutting high-precision drilling method. The drilling method comprises the following steps: installing a laser cutting head at the position of a machining head of a laser machining machine tool, wherein the laser cutting head can output double laser beams, one laser beam is a high-power hot melting cutting laser beam, and the other laser beam is an ultra-fast pulse precision trimming laser beam; adjusting the relative orientation of the laser cutting head and a workpiece so as to enable the two laser beams output by the laser cutting head to be perpendicular or incident on the surface of the workpiece at a certain deviation angle and to focus on the surface of the workpiece, wherein the optical axes of the two focused laser beams are coaxial or parallel; and starting the composite cutting process in any one of three ways. By means of the double-laser composite cutting high-precision drilling method, a surface hardening layer cannot be generated, therefore, traditional machining methods such as milling, boring, drilling, turning and the like do not needed for removing the surface hardening layer, and the method can be directly used fordrilling important metal parts, such as bolt holes, pin holes and other holes with impact or fatigue loads.

Description

technical field [0001] The invention belongs to the field of laser processing, and in particular relates to a high-precision hole-making method of double-laser composite cutting. Background technique [0002] Laser cutting is the use of a focused high-power-density laser beam to irradiate the workpiece, so that the irradiated metal material is rapidly melted, vaporized, ablated or reached the ignition point, and at the same time the molten material is blown away by the high-speed airflow coaxial with the beam, so as to achieve the workpiece cut open. Like traditional plasma cutting and oxyacetylene cutting, laser cutting is one of the thermal cutting methods. [0003] In the process of laser cutting section, there are inevitably two defects. One is that at the beginning, turning and end positions of the laser cutting path, there is always a vertical pit or The ridge (along the direction of the optical axis) defect has a relatively large surface roughness; secondly, because...

AI Technical Summary

Problems solved by technology

However, ultra-fast laser micromachining technology inherently has the disadvantage of low processing efficiency, and its "micromachining" characteristics are obviously not suitable for making holes in general metal parts, and the cost performance is too low