Control of laser drilling size and precision of laser cutting machine

(1) Aperture size control a laser with a small divergence angle (0.001 to 0.003 rad) is used, and a small aperture can be obtained by shortening the focal length or reducing the output energy. For high melting point. The material with good thermal conductivity can realize the micro-hole processing with the aperture of 0.01 to 1mm, and the minimum aperture can reach 0.001mm.

(2) Hole depth control to improve the output energy of the laser, using reasonable pulse width (the better the material and thermal conductivity is, the shorter the pulse width is), using the fundamental mode (light intensity distribution is Gaussian single mode) can obtain a large hole depth. For the deep hole with small aperture, it is better to irradiate it with laser for many times, and to drill it with an objective lens with short focal length (15 ~ 30 mm).

(3) To improve the roundness of the hole machined by laser, the laser mode adopts the basic mode machining, the aspherical lens is used as the focusing lens, and the optical axis of the lens is coincident with that of the laser beam, and the workpiece is suitable to deviate from the focusing point and proper laser energy is selected.

(4) Decrease the taper of the hole. Generally, the taper of the hole increases with the increase of its aperture ratio. The proper laser output energy or small energy for multiple irradiation, shorter focal length, small refractive index of lens and reducing the angle between the incident ray and the optical axis can reduce the taper.

In the laser cutting machine adopting a flying light path, only the cutting head moves along the X and Y directions in the cutting process, and the worktable position is fixed. In addition, there is a fixed optical path flying beam transmission form of articulated movable arm, which is called constant flying optical path, referred to as constant optical path.

From the equipment drive mode, there are X, Y axis selection of unilateral servo motor with the corresponding reducer, with high-precision rack and pinion drive structure;Both sides of the X axis are equipped with servo motors and corresponding speed reducers, with high-precision gear and rack drive structure, with dual gears to eliminate reverse backlash drive mode;Servo motor configuration with high precision ball screw direct drive, using disc motor with large inertia direct gear, rack drive;There is also a direct drive structure of linear motor.Different lasers are selected according to the processing performance, processing material, shape and size of the user, and the lasers available for matching include CO2 axial fast flow laser, RF board debugging laser, swirl laser, solid laser and fiber laser.