Packaging steel strip cold rolling deformation zone process unit characteristics of pressure distribution and its influence

Packaging steel strip cold rolling deformation zone process unit pressure distribution characteristics and influence under the condition of cold rolling thin specimen measured unit pressure curve. , the unit of uneven distribution of sound pressure along the contact arc, has obvious peak and very close to the exit; Will enter and exit the unit pressure value of connection curve approximation is regarded as the way of metal hardening curve, it is the area of the unit under the pressure distribution curve can be divided into two parts: the following referred to as the basal part, reflect the effects of material properties in itself; The above called friction peak, reflect the effects of external factors such as friction conditions. Obviously, in addition to the material strain hardening characteristics of unit pressure distribution curve has obvious influence, the influence of friction condition is more serious, and so on. Because the unit pressure distribution curve has the above characteristics, so the cold rolling process has the characteristics of a series, and cause many adverse effects of cold rolling process. First of all, compared with the other rolling conditions, cold rolling process of average unit pressure p and rolling force p is very big, can be multiplied, and even several times to increase, the second, a lot of friction can be converted to friction heat, a dramatic heating effect of the cold rolling process, the temperature of the rollers and rolled piece can be increased to 100 - Above 120 ℃, and effective cooling should be on them, otherwise, will effect on the service life of roll, lubrication, power consumption and serious impact on product surface quality, etc. Finally, if the section of approximate maximum unit pressure is as neutral surface, neutral Angle & gamma; Is very small, the forward slip S is very small, usually only ( 1 - 5) %。 Measurement shows that the three racks in 350 mm cold tandem mill finished goods shelves, in some cases, even can produce negative phenomena of slide before. Theoretical analysis shows that when the negative forward slip after more than a certain critical value, can lead to a skid, make the rolling process is not stable, and scratch the strip surface and the surface of the roller.