The hottest technology of laser cutting thin glass

2022-08-17
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Laser cutting thin glass technology

nowadays, the quality requirements for glass products are getting higher and higher. In addition to considering different material characteristics, processing technology must also achieve more precise, detailed and pure processing results, and innovative laser cutting technology has become the standard of glass cutting in many industries. In the increasingly demanding markets such as electronics, there is an urgent need for innovative glass cutting technology

traditional glass cutting methods use cemented carbide or diamond tools, which are widely used in many applications. Its cutting process is divided into two steps. First, the glass is used with a diamond tip or a hard alloy grinding wheel to produce a crack on the surface of the glass; Then, the second step is to use mechanical means to separate the glass along the crack line

however, there are some defects in carving and cutting with this method. The removal of materials will lead to the generation of debris, fragments and micro cracks, which will reduce the strength of the cutting edge, so another cleaning process is required. The deep cracks caused by this process are usually not perpendicular to the glass surface, because the dividing line generated by mechanical force is generally non vertical. Moreover, due to technical and technological problems, the output loss caused by mechanical force acting on thin glass is also a negative factor

these defects can be improved by using stress-free glass and further optimizing the tooling for segmentation. However, it is still impossible to completely avoid the systematic contradiction between the vertical cutting line and the prevention of edge debris/cracks. The development of laser technology has brought solutions to these quality problems

laser marking and segmentation

different from traditional mechanical cutting tools, the energy of the laser beam cuts the glass in a non-contact way. This energy heats the specified part of the workpiece to a predetermined temperature. This rapid heating process is followed by rapid cooling, which causes a vertical stress band in the glass, and a crack without debris or cracks appears in this direction. Because cracks are only caused by heat, not mechanical reasons, there will be no debris and microcracks. Therefore, the intensity of laser cutting edge is as strong as that of traditional engraving and segmentation methods. It is stronger than that used in research institutes, colleges and universities, metallurgical steel manufacturing, shipbuilding and other industries. The need for finishing has also been reduced. Here is a detailed share of the operation of the oil delivery valve and oil return valve: low or not at all. In addition, the occurrence of glass fragments can also be completely avoided

for laser engraving, under the action of laser beam heating and subsequent cooling process, the glass surface is marked with a depth of about 10mm (about 10% of the glass thickness). The glass can then be divided in the direction of the scribe. Because this technology does not produce any glass fragments, the common burrs and low strength of the cutting edge are also avoided, and the subsequent polishing and grinding processes are no longer needed. More importantly, compared with the glass segmented by the traditional method, the glass processed by this method has a crushing resistance of up to three times. For glass with a thickness between 5mm and 1mm, it is possible to complete the overall cutting even in one step. Segmentation and subsequent polishing, grinding, washing and other steps are no longer required. The strength of the cutting edge can be measured by the standardized four point bending test from din-en. A piece of glass is fixed on two rollers, and the other two rollers are used to generate the required bending force on the upper surface of the glass. Under this force, the glass can be divided into two parts. The test is repeated about 100 times to obtain appropriate reliable statistics about the possibility of segmentation

in most cases, laser scribing and cutting are the choice for mass processing. Its advantages lie in high processing speed, high precision and simple parameter setting. However, when cutting many different lines and processing time is sufficient, overall cutting is a more attractive method because it has dry cooling and no additional cutting steps. In both cases, high-quality cutting edges will be produced. It can be seen that if laser cutting glass is used, it can save time and improve the processing quality

laser cutting in production

it is not easy to transplant a new and mature technology to mass production lines for processing high-tech products. From the perspective of customers, before implementation, this technology must be an automated and reliable solution, which has not only been fully proved, but also considered the economy. In practice, the application of innovative technology is only effective in two cases: the introduction of new products requires new production means to achieve innovative features or reduce production costs by reducing processing steps, or the existing production needs huge improvement of production methods to alleviate economic pressure

in the flat panel display industry, it took five years for the promotion of laser cutting technology to find its place in the production line, provided that it has experienced thousands of hours of application verification in many processing lines. Now, it is usually considered to be used for the production of new products with the risk of glass breakage, or for the manufacture of communication mobile products with glass in the electronic industry, or other products with fragile parts containing thin glass, such as sensors, touch panels or glass shells

processing is usually carried out in clean rooms, just like the biochemical industry, because these are very sensitive to particles generated by traditional cutting or grinding steps. For example, the base material covered with DNA code (biochemical bar code) or the material cut into pieces by laser is used for product testing. For laser cutting technology, the next most potential application industries will be solar energy industry and automobile industry

just like the development of laser technology in the metal processing industry for many years, the laser cutting technology for glass processing will continue to develop; This technology will be widely used in the processing of different products to replace the traditional means. However, the traditional glass processing method will maintain its important position in the processing of most glass products in the future. Generally speaking, in these applications, the processing quality of cutting edges is not very high

laser shape cutting is an innovative technology, which will find a place in the electronics, automotive or construction industries. In addition to laser cutting glass, many other means of laser processing glass are in the stage of further development and testing, such as drilling, chamfering, and coating removal. These processes require different kinds of lasers, such as green lasers

the mature CO2 laser cutting technology is used to process other fragile materials, such as ceramic materials for manufacturing wafers in the electronic industry. Other materials commonly used in the semiconductor industry are also expected to become the object of laser processing, as long as they can pass the test and be put into actual production

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