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The Reason Of The Rolling Speed Of Cold Foil Lunch Box Sep 06, 2017

The reason of the rolling speed of Cold Foil lunch box
 1, the performance of foil rolling mill.
    2, the quality of blank. If the thickness of the larger volatility, plate or end face bad, in order to maximize the quality of Cold Foil after rolling should be used low-speed rolling.
    3, rolling oil. In the case where the other conditions are the same, the rolling speed decreases with the increase of the additive content in the rolling oil and the increase in the degree of the lust of the rolling oil, and increases as the temperature of the rolling oil increases.
    4, roll roughness. In other cases, the rolling speed decreases with the increase of the roughness of the work roll, and increases with the decrease of the roughness.
    5, Cold Foil shape. During the rolling process of the aluminum box, the temperature of the rolling deformation zone changes rapidly due to the effect of deformation heat and frictional heat, so that the roll roll shape changes. The cold-foil shape of the rolled plate will change with the change of the roll shape. For the cold-rolled rolling mill with manual control plate shape, the change of the Cold Foil shape depends entirely on the observation of the operator, and then manually control the bending roll Or rolling force and the nozzle of the injection volume, if the rolling speed is too fast, the operator's ability to keep up, the shape control is very difficult. Even a finest operator, the control of the rolling speed is generally not more than 700-800m / min, the best online level in more than 1801.
    When the rolling speed exceeds 800 m / min, in order to obtain a good plate quality, it must use plate automatic control system. As the plate-shaped automatic control system uses automatic spray, automatic bending roll, automatic tilt, more advanced rolling mill also uses VC, DRS and other plate-shaped control technology, so that the aluminum box rolling speed and plate control level Improve the Cold Foil on-line shape can be controlled at levels below 191-201.
    6, the surface quality. In other conditions with the same conditions, the rolling speed is low, the film between the roll thin, aluminum tip surface closer to the roll surface, rolled out of the Cold Foil brightness is good. The rolling speed is high, the thickness of the film between the rolls is thick, and the brightness of the rolled aluminum grid is poor. Therefore, in the non-finished pass, high-speed rolling should be used to improve the production efficiency, but in the production of finished products, Of the brightness is good, should reduce the rolling speed, the appropriate increase in tension, the 0.006-0.007mm thickness of the Cold Foil bimodal rolling speed is generally not more than 600m / min.
Factors Affecting the Quality of Cold Foil Containers
    First, the quality of blank
    As the intermediate product in the production of foil, the microstructure, microstructure and surface quality will directly affect the structure and performance of the final product. The thinner the product, the greater the impact of the organizational structure. Compared with the hot-rolled billet, the amount of deformation of the casting and rolling is much smaller, and its quality is more direct to the final product.
   (1) purity
    Most of the Cold Foil is made of 99.0% -99.5% of the industrial pure aluminum processing, usually the higher the purity, the lower the tensile strength, the greater the elongation. And improve the impurity content can enhance the tensile strength of the move, while the elongation decreases. However, when the purity of aluminum is too low, the brittleness of the material increases, the rolling performance deteriorates, and pinholes are liable to occur, and it is not suitable for rolling thin products.
   (2) Cold Foil Impurities Industrial pure aluminum usually contains impurities such as Fe, Si, Cu, Mn, Ti, B, C, etc., some impurities are inherent, and some are deliberately added.
   (3) Fe-Si-Al compounds are always present in the second phase and the compound industrial pure aluminum. The second phase after as-cast and homogenization is close to equilibrium. Cold Foil It is difficult to occur in the process of cold type, The number of changes will remain in the final foil product. The type, particle size, shape, distribution, quantity, etc. of the second phase will have an important effect on the strength, processability, fatigue resistance, corrosion resistance and other properties of the material. Especially the double-zero foil, the grain is usually larger than the box thickness, the grain was two-dimensional arrangement [56_58], the number of adjacent grains less, grain boundary was flat mesh distribution, compared with the block material , The second phase is more likely to affect the mechanical properties of the box.
   (4) grain size When the original grain size is relatively coarse, especially twin, twin organization has a strong direction, Cold Foil is difficult to break, coarse grain processing area hardening rate, deformation difficult, making the box Material organization and performance unevenness, rolling plate shape is difficult to control, and may even produce broken belt. Coarse grain of the casting belt also by the cold ceremony to 0.5_ annealing, the grain will remain coarse, uneven organization, the other surface to produce "white bars", and increase the pinhole rate of the product. Therefore, the average grain size requirement is less than 70 ^ 011 [22]. But does not mean that the smaller the grain size the better, although the grain refinement can increase the plasticity of the material, but also increase the deformation resistance, high degree of hardening when dairy, it is difficult to milk out the thin box.
   (Al-Ti-B or Al-Ti-C), Cold Foil the introduction of heterogeneous knot nucleation, can refine the cast microstructure, reduce the grain refinement agent The hot cracking tendency of the ingot and the improvement of the uniformity of the structure, especially for the rolling material used for rolling or extrusion, can significantly improve the surface quality and processability of the deformed product and reduce the surface defects.