The current physical toughening method commonly used in glass cutting machines is to heat the glass to the softening point (about 650 ℃). At this time, the glass can still maintain the original shape, but the particles in the glass have a certain migration ability. So that the internal stress is quickly eliminated, blowing and quenching, when the temperature is balanced, the glass surface generates compressive stress, and the inner layer generates tensile stress, that is, the glass generates a uniform and regularly distributed internal stress, which improves The tensile strength of glass as a brittle material improves the bending and impact strength of glass. At the same time, due to the existence of uniform stress inside the glass, once the glass is broken by an impact that exceeds its strength and can withstand, it will explode into small particles under the action of internal stress, which improves its safety. Therefore, steel.
During the tempering process of the glass tempering furnace, wind spots and stress spots are generally generated. The wind spots are formed during the cooling process due to uneven cooling due to uneven cooling, which will be observed under a special angle. See the light and dark stripes on the glass surface. Stress spots are also caused by uneven stress. For example, in the heating process, there is a temperature difference between the edge and the middle of the furnace, resulting in uneven stress. There is currently no way to completely avoid stress spots, but a well-designed tempering equipment can minimize the visibility of stress spots.
