What should be paid attention to in the operation of small steel furnace
The small tempering furnace uses physical or chemical methods to form a compressive stress layer on the surface of glass and a tensile stress layer inside the glass. When the glass is subjected to external force, the compressive stress layer can offset part of the tensile stress to avoid glass breakage, so as to improve the glass strength. Moreover, the microcracks on the glass surface become more subtle under this kind of compressive stress, and the strength of the glass is improved to a certain extent.
Small steel furnace
At present, the physical tempering method commonly used in small-scale tempering furnace is to heat the glass to the softening point (about 650 ℃), at this time, the glass can still keep its original shape, but the particles in the glass have certain migration ability, so the internal stress can be eliminated quickly by structural adjustment, and then the tempered glass in the glass tempering furnace is blown and quenched. When the temperature is balanced, the surface of the glass will be changed In other words, the glass produces a uniform and regular internal stress, which improves the tensile strength of glass as a brittle material, so as to improve the bending and impact strength of glass.
At the same time, due to the existence of uniform stress in the glass, once the glass is broken due to the impact which exceeds its strength, the glass will self explode into small particles under the effect of internal stress, which improves its safety. Therefore, the manufacturer of small-scale tempering furnace said that tempered glass can also be called prestressed glass or safety glass.
During the tempering process of glass tempering furnace manufacturers, wind spots and stress spots are generally produced. Wind spots are caused by uneven stress of glass due to uneven cooling in the cooling process. When observed from a certain special angle, the glass surface presents light and dark stripes. The stress spot is also caused by the uneven stress. For example, in the heating process, there is a temperature difference between the edge and the middle of the furnace, which leads to the uneven stress. At present, there is no way to avoid stress spots completely, but the visibility of stress spots can be greatly reduced by well-designed tempering equipment.