People have been cutting glass through various forms of traditional techniques for centuries, usually by sharpening the surface of the glass with sharp and hard tools (such as diamond or carbide wheels) and then applying mechanical breaking force to allow the glass to follow The scratches are completely separated. In automatic systems, glass separation is often achieved by a "gate bar" that is pressed onto the glass.
Unfortunately, this approach has a number of drawbacks, especially in today's environments where increasingly thinner substrates are used in flat panel displays (FPDs). The main drawbacks include that the mechanical force exerted by the scoring tool causes the material to produce fine cracks, the subsequent breaking steps cause small gaps and debris, and the cutting edges are not necessarily perpendicular to the glass surface. In addition, mechanical cutting leaves considerable mechanical stress on the edges of the finished product. In fact, when the thickness of the substrate is less than 1 mm, since the glass is particularly susceptible to breakage, it has been difficult to use the mechanical cutting method at this time. In order to prevent cracking or breakage of the glass after undergoing the first cutting process, it may be necessary to sand or polish the cutting surface. In addition, cleaning may have to be arranged after processing to remove debris that may interfere with subsequent processes, such as circuit formation (when glass is used as a substrate in microelectronics manufacturing).
For manufacturers, the arrangement of various edge grinding and cleaning processes after processing will undoubtedly increase manufacturing man-hours and costs. These links can also have a negative impact on the environment, including the production of unmanageable debris or the use of large amounts of water for cleaning purposes. In addition, the demand for curved edges (especially FPD for portable devices) is increasing, and the mechanical cutting of glass does not support the edge of the cutting curve.
These limitations are particularly acute given the current trends in glass use. Specifically, current market trends include higher precision parts, more complex shapes and cuts, ultra-thin (less than 1 mm) substrates, and chemically strengthened glass (the mechanical method does not yet support cutting). Kind of glass).
Then the application technology of glass laser cutting machine in the precise processing environment, what advantages does laser cutting have compared with traditional machining methods?
There are many laser technologies for glass cutting, and these technologies are implemented in a variety of ways. However, the main advantages of all these glass laser cutting techniques have some similarities.
First of all, all laser cutting methods use a non-contact processing process, which greatly avoids the problem of fine cracks and debris. Secondly, the residual stress left in the glass by the laser cutting method is extremely small (the residual stress of the different cutting methods is different), and thus the strength of the cutting edge is higher. This is very important. If the residual stress is too large, even if the force is applied at the center of the glass plate, the edge of the glass will often be broken. As a result, laser-cut glass can withstand 1-2 times more force than mechanically cut glass.
Laser cutting machine also reduces the number of process steps due to little or no need for subsequent cleaning or polishing stages. Therefore, although the investment cost of the laser cutting table is higher than that of the mechanical system, the total investment in laser cutting is lower than that of the machining system because no additional grinding machine is required. In addition to the reduced demand for post-processing and cleaning work, laser cutting is more environmentally friendly than mechanical methods and consumes less water (or no water at all). Finally, some laser cutting methods support glass curve cutting. Today's demand for curve cutting is growing, especially in the mobile phone manufacturing industry, where manufacturers want to produce more complex screens, including punching holes in materials to accommodate buttons, controls, LEDs and camera lenses.