How does the small laser marking machine control the quality of the glass laser marking machine?

Many factory technicians will use the glass laser marking operation, but it is more difficult to achieve exquisiteness, and the mind is confused. Today, Xiaobian will briefly talk about the operation of the laser marking machine. How should we control the quality of the glass laser marking machine during the operation?

laser marking technology

Among the improvements and developments, a new technology makes it possible to make sharp, high-quality marks directly on glass using a sealed-off carbon dioxide (CO2) laser marker, which can replace expensive solid-state lasers. And the technology of traditional glass marking methods, 25W carbon dioxide (CO2) laser can meet most of the requirements of marking on glass. Carbon dioxide (CO2) lasers mark on glass by destroying the glass surface, so a certain number of cracks on the glass are allowed, but excessive cracks will lead to unclear markings, potential weakening of material strength, and more serious damage to the substrate. It becomes loose, but you don’t have to worry about it. In the continuous experiments of laser engraving machine companies, it is found that these problems can be avoided by accurately controlling the amount of cracks in the material during the marking process. Type and number of cracks produced:

The first method uses multiple laser irradiations;

The second method It is to use discrete points to form annular cracks;

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

First of all, the first method uses a single laser radiation to produce a sharp and visible mark on the glass, but it must be noted that cracks and The direction of the stress pattern will expand perpendicular to the direction of the laser movement. In a short time or even a few days after the mark is printed, these cracks perpendicular to the direction of the laser movement will form new cracks, which will expand to the vicinity of the original mark and form fragments, thus affecting the clarity of the mark. Using multiple laser irradiations, the areas adjacent to the marked area are heated by thermal conduction, thereby forming a stress gradient in these areas and reducing the possibility of secondary cracking. Marking on soda lime and borosilicate glass is very effective with this method. One laser radiation is effective for marking on fused silica glass and quartz glass, because these two materials have low coefficients of expansion.

The second method uses a series of annular cracks to form text, barcodes, square or rectangular codes, and other Shape code pattern. Glass develops low-density annular cracks through heating and cooling cycles. When the glass is heated, it expands and squeezes the surrounding material. When the temperature rises to the softening point of the glass, the glass rapidly expands to form a dome of low-density material that protrudes from the glass surface. The glass shrinks to its initial surface position after heating, but this relaxation time is the time for the formation of the entire low density, preventing it from returning to the initial position before the softening temperature.

The glass was marked with a carbon dioxide (CO2) laser using three different marking methods, i.e. multiple laser passes; discrete dots formed rings cracks and crack-like surface cracks. Since the spot energy is Gaussian, the temperature at the center of the spot is higher. When this high temperature region returns to near the starting position, the center of the annular crack forms in this region. A stable annular crack forms at the junction between the low-density formation region and the standard-density region. This method is suitable for marking on common optical materials and tempered glass, chemically strengthened glass or common soda lime float glass.

The third method also uses the same heating and cooling process, which is to make a certain volume of glass Surface changes. However, the size of the spot used in the third method is relatively large, and the boundary line at the junction of the two density regions is not as clear as the annular crack method. The marks produced by this method are not immediately visible, requiring a little pressure before grid cracks begin to develop along the laser marked area. Text, graphics and various codes are formed by filling the pattern with the resulting non-fragmented, crack-like stripes. Because this method requires a pristine surface, high-quality automotive glass can be used to print clear markings.

If you can master the above methods, maybe you can easily master the quality of the glass laser marking machine. Content can help those who need it!

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