Types of laser marking machines

Release time:

2020-10-18 12:05

Generally speaking, under the control of a computer, a laser marking machine causes a controlled relative movement between the marked workpiece and the laser beam, and the laser beam ablate the required symbols and patterns on the surface of the workpiece. Obviously, there are two ways for a laser marking machine to produce this relative motion: one is to fix the laser beam and move the workpiece; the other is to fix the workpiece and move the laser beam. For the former, a two-dimensional mechanical CNC (or computer-controlled) workbench is typically used to drag and mark the workpiece. The workpiece is driven by the workbench and moves according to the designed trajectory. Under fixed laser beam ablation, permanent marks are left on the surface of the workpiece.

The marking method of this laser marking machine is called "worksheet". The biggest advantage of this marking machine method is that the price is relatively low, but due to the limitations of the design of the mechanical movement mechanism, the marking speed is fast, but it is difficult to mark text and patterns, and it is impossible to mark photos. For the latter method, there are two common methods: Two connected optical mirrors are used to deflect the laser beam.

The laser beam emitted by the laser irradiates the first reflector, refracts 90° horizontally, and then irradiates the second reflector. The second mirror reflects the laser beam downward through the focusing lens and focuses it on the workpiece surface. The lens is fixed to the second mirror. As the first mirror moves along the laser axis, it drives the second mirror, which moves along the reflected laser beam.

These two actions are controlled by the computer. The combination of these two movements is the trajectory required to mark the pattern. This method of marking is called the "ritual of drawing" because it works on the same principle as a pen plotter. During the marking process, the two mirrors carry the laser beam and move widely, just like the laser beam flying around, so it is also called a "flying optical" marking machine.

Compared with "workbench" laser marking machines, its movement mechanism is lighter and simpler. However, since the optical path of the laser beam continuously changes during the marking process, it is difficult to maintain the final spot quality on the workpiece surface. This kind of laser marking machine is easy to mark on a large scale without reducing the energy density of the laser spot, but it is difficult to mark fine lines and the marking speed is slow.

The laser beam is deflected and moved through the galvanometer scanner. The laser beam emitted by the laser is sequentially projected to the first and second galvanometer scanners. They scan in the X and Y directions of the plane respectively. Under computer control, the laser beam is focused through a focusing lens and scanned on a flat surface.

This marking method is called "galvanometer scanning type" and has the advantages of fast trimming and fine marking. Can handle various exquisite characters and pattern marks. However, due to the high cost of marking, it is difficult to expand the scope of marking. However, due to its fast marking speed and precise marking, laser marking machines have become the main product.

Features of metal cutting machines

Structure of laser marking machine

Features of metal cutting machines

Structure of laser marking machine

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