Glass cutting machine manufacturer to introduce Mr Wade toughened glass is glass of a kind of prestressing force actually, to enhance the strength of the glass, use the method of chemistry or physics normally, form in vitreous surface press stress, glass bears offset above all when outside force surface layer stress, so as to improve the bearing capacity, enhance the wind resistance glass itself, through sex, impact, etc.
The deformation is mainly from aspects of toughened glass.
The first problem the precision of the roller table, followed by uneven stress problem.
The first point, roller problems caused by the bad flatness glass toughened glass cutting machine
manufacturer to introduce Mr Wade heating roller deformation usually, level of roller table glass tempering furnace is made of fused quartz or ceramic materials, it has good thermal shock and thermal stability, but because sometimes the internal structure of inhomogeneity may lead to produce hot deformation under the high temperature heating especially.
The roller thermal deformation inevitably cause a roller bending, also inevitably cause deformation movement on the surface of glass.
Second, caused by the uneven heating temperature of the thermal deformation of glass when heated up and down when the glass is passed to the heating surface temperature difference on the roller table, glass under the table and the surface contact, direct heating roller, in the form of conduction heat transfer with glass, the glass is heated by means of thermal radiation on the surface of the glass on the surface, the surface heat transfer rate is higher than on the surface of the heat transfer rate, when not taken as the auxiliary heating heat balance on the glass surface temperature is lower than the surface temperature, the glass is typical of the elastomer at the beginning of the heating, the thermal expansion coefficient of glass and is higher (
The linear expansion coefficient of glass for 9 x 10 /.
, due to the surface temperature is higher than the surface temperature, the surface of the expansion rate is higher than on the surface, make the glass up and bend around the glass from the table, the formation of glass in the middle is heated and only the middle roller support, when the glass is to continue with the position of the roller contact heating first reach the softening temperature and carry the full weight of the glass, glass in the middle part of the 'flow' deformation happens, ask thinning result in part of roller marks or even optical deformation, on the other hand, when the glass was heated to softening temperature all glass after flattening, but the difference in temperature did not disappear, this is the temperature was uniform cooling to room temperature glass on the surface of the heat is greater than the grim contraction and form to the thermal bending below.
Third, thermal deformation caused by uneven cooling glass cutting machine manufacturer
to introduce Mr Wade toughened glass is glass of permanent stress, the internal stress in glass also the imbalance will produce deformation: when the upper surface compressive stress is greater than the surface compressive stress to balance the stress under the glass bending down, again, on the surface compressive stress is greater than the surface compressive stress to balance the stress at the glass bending upwards, glass in the cooling process, because of the unequal upper and lower surface cooling rate, the cooling speed of the surface of the surface stress is greater than the cooling speed is slow.
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