New CNC cutting technology for special glass

With the expansion of the display area of the full screen mobile phone, the distance between the right angle of the display area and the rounded corner of the mobile phone edge is also narrowed, which is easy to cause damage. Therefore, the special-shaped cutting technology is particularly important under the full screen. And profiled cutting also makes CNC technology play a more important role.

As a professional CNC R & D, production and sales manufacturer, Jiujiu Seiko has a number of CNC research patents and is committed to engraving CAD / CAM technology. It has made great achievements in the design of precision engraving machine and engraving technology, and realized the process of NC technology to industrialization.

Wang Shanning, the director of Jiujiu Seiko, also gave a wonderful share at the meeting as the naming agent of the second season “full screen” meeting. Wang Shanning said that the traditional LCD screen cutting is generally realized by laser or knife wheel, while the CNC process is only used as an auxiliary tool. However, in the era of special-shaped screen cutting, due to the high requirements for the strength and thickness of the screen itself, as well as the bonding of the double-layer LCD screen and other factors, CNC will play a greater role in the special-shaped cutting of the full screen.

The cutting of special-shaped screen is divided into cutting at different positions such as C angle, l angle, R angle and U-shaped groove. Among them, 2C angle (single layer), 2C + 2R (double layer), 2C + L (double layer) and 2C + 2R + U (double layer) are the four most important combination cutting at present. For CNC, the cutting at these positions needs to be improved in many aspects. If the fixture is improved, it needs to make the angle directly on the fixture to facilitate positioning; The vacuum hole should be made small to prevent the glass deformation caused by excessive suction; In addition, vacuum suction points should be designed at the processing parts to prevent glass shake during processing due to insufficient vacuum; Finally, pay attention to avoiding voids in the processing parts.

Wang Shanning said that CNC has obvious advantages in special-shaped cutting, such as high grinding accuracy, machining accuracy ≤ 0.015mm, and edge collapse ≤ 0.03mm; High strength, the maximum bearing pressure is 110MPa; In terms of cost, CNC also has an advantage. In the same efficiency of cutting / grinding equipment, CNC procurement cost has an overwhelming advantage; The degree of automation is high. In addition, according to different processing accuracy and speed requirements, CNC can choose a variety of processing models and schemes such as single axis machine, double axis machine and full-automatic production machine.

Wang Shanning also made no secret of the difficulties of CNC grinding.

Wang Shanning said that one of the difficulties lies in the brittleness, ultra-thin and high-precision characteristics of the overall screen, which determines that the difficulty of CNC grinding lies in the control of the amount of edge collapse.

In this regard, Wang Shanning also provided corresponding solutions. First, the accuracy of the grinding head. The lens accuracy of the grinding head mounted on the main shaft requires that the runout is within 0.005mm. The smaller, the higher the accuracy; Second, the accuracy of the main shaft. The vibration during the high-speed operation of the main shaft is required to be within 0.5m/s. The smaller the value, the higher the accuracy; Third, the vibration of the machine tool during operation is required to be within 6.5m/s, and the smaller the value, the higher the accuracy; The fourth is to maintain high speed, low feed and low cutting amount during processing.

The second difficulty lies in the control and efficiency of the edge collapse of U-groove cutting and grinding. Wang Shanning believes that the solution is that the grinding head diameter should be less than 30% of the R angle of the U-shaped groove, and the walking angle speed should be 30% lower than the linear speed.

Wang Shanning finally concluded that the cutting of CNC as a special-shaped screen is far from reaching the mature stage, and it is still changing and excessive. As far as the industry is concerned, in the future, the single axis machine will transition to the double axis machine, and the double axis machine will transition to the automatic production line. Most importantly, the combination mode of CNC + laser will become an important trend of the industry.