How to control the quality of glass laser marking machine?

Many factory technicians will use the laser marking operation of glass, but it is more difficult to be exquisite, and the mind is confused. Today, the editor will give you a brief description of the operation. During the operation of the laser marking machine, how should we control the quality of the glass laser marking machine?

In the continuous improvement and development of enterprise factories and manufacturing industries, a new technology makes the use of sealed carbon dioxide (CO2) lasers It has become a reality that the marking device can directly mark high-quality marks with clear outlines on the glass. This is a technology that can replace expensive solid-state lasers and traditional glass marking methods. 25W carbon dioxide (CO2) lasers can meet most of the requirements. Requirements for marking on glass.

The carbon dioxide (CO2) laser marks the glass by destroying the glass surface, so a certain number of cracks on the glass is allowed, but excessive cracks will cause unclear markings, potential weakening of the material strength, and more serious It is to make the substrate loose, but you don’t have to worry about it. Continuous experiments in laser engraving machine companies have found that precise control of the amount of material cracks during the marking process can avoid these problems. After summarizing, there are three methods that can be used. Control the type and number of cracks on the glass surface:

The first method is to use multiple laser radiation;

The second method is to use discrete points to form ring-shaped cracks;

The third method is to produce crack-like surface cracks.

First of all, the first method uses a laser radiation to produce a clear visible mark on the glass, but it must be noted that the direction of the crack and the stress pattern will change Expand in the direction perpendicular to the laser's movement.

In a short time or even a few days after the mark is printed, these cracks perpendicular to the moving direction of the laser will form new cracks, which will extend to the vicinity of the original mark to form fragments, which will affect the clarity of the mark.

Using multiple laser radiation, the area adjacent to the marking area is heated by heat conduction, so that these areas form a stress gradient and reduce the possibility of secondary fracture.

This method is very effective for marking on soda lime glass and borosilicate glass.

A laser irradiation is more effective for marking on fused silica glass and quartz glass, because these two materials have very low expansion coefficients.

The second method is to use a series of circular cracks to form text, bar codes, square or rectangular codes, and other shape code patterns.

The glass produces low-density ring-shaped cracks through heating and cooling cycles.

When the glass is heated, it expands and squeezes the surrounding materials. When the temperature rises to the softening point of the glass, the glass rapidly expands to form a low-density material that protrudes from the glass surface.

After heating, the glass shrinks to the initial surface position, but this relaxation time is the time for the formation of the entire low density, making it impossible to return to the initial position before the softening temperature.

Three different marking methods are used to mark the glass with a carbon dioxide (CO2) laser, that is, multiple laser passes; discrete points form ring-shaped cracks and cracks Shaped surface cracks.

Because the energy of the spot is Gaussian, the temperature at the center of the spot is higher.

When this high-temperature zone returns to near the starting position, the center of a ring-shaped crack is formed in this zone.

A stable ring-shaped crack is formed at the junction between the low-density formation zone and the standard-density zone.

This method is suitable for marking on common optical materials and tempered glass, chemically reinforced glass or common soda lime float glass.

The third method also uses the same heating and cooling process, which changes the surface of a certain volume of glass.

However, the size of the spot used in the third method is relatively large, and the boundary at the junction of the two density regions is not as clear as the ring crack method.

The marks produced by this method are not immediately visible, requiring a little pressure before starting to produce grid-like cracks along the laser marking area.

Use the generated non-fragmented cracked stripe filling pattern to form text, graphics and various codes.

Because this method requires a pure surface, clear marks can be printed with high-quality automotive glass.

If you can master the above methods, maybe you will be able to easily grasp the quality problems of the glass laser marking machine. I hope that the above content of Minsheng can help you what you need People!

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