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ArticleName | Development of the theory of calculating the force indicators of rolling along the length of thin bands and strips |

DOI | 10.17580/chm.2023.11.03 |

ArticleAuthor | R. L. Shatalov |

ArticleAuthorData | Moscow Polytechnic University, Moscow, Russia |

Abstract | The results of an experimental study of the distribution of external longitudinal stresses measured by a magnetoanisotropic sensor (MAS) over a width of 250 mm of a steel 08kp strip with a thickness of about 1 mm during cold rolling at the exit of the mill 205/360×500 are presented. It has been experimentally established that the magnitude and distribution of contact stresses across the width of the strip are affected by the magnitude and nature of the distribution of longitudinal stresses in the outer parts of the roll. An increase in tensile stresses in the outer parts of the strip leads to a decrease in the normal contact stresses and the average pressure of the metal on the rolls, and vice versa. An equation is proposed for calculating the coefficient of influence of uneven longitudinal stresses on the pressure of the metal on the rolls. Using CAD, computer modeling and calculation of the deformation and force indicators of thin strip rolling were carried out, taking into account the influence of the characteristics of the outer parts of the rolled product on the deformation zone. Changes in the rolling forces along the length of thin strips of 08kp steel on a 150×235 mill equipped with a microcontroller system for measuring the loads on the rolls are shown. Measurements showed that the rolling force during deformation of the end sections of the strips is 2–3 times less than the middle part of the rolled product, due to the weak influence of the outer parts of the strip on the pressure and rolling force. A quantitative analysis of changes in the size of strips and rolling forces in stationary and unsteady sections along the length of the strip has been carried out. The equation for determining the average pressure of the metal on the rolls has been refined, taking into account the influence of the external parts and the rigidity of the strip on the deformation zone during thin-sheet rolling. It is shown that the proposed equations can significantly improve the accuracy of pressure calculation and determination of rolling forces along the length of thin strips and strips. Taking into account the influence of the characteristics of the outer "hard" parts of the strip makes it possible to reduce the error in determining the average pressure, on average from 23.8 to 4.9%. |

keywords | Rolling pressure and force, outer parts and strip stiffness, rolling mill 205/360×500, steel 08kp, mill 150×235, magnetoanisotropic sensor (MAS), microcontroller force measurement system, measurement of longitudinal stresses along the width of strips, CAD |

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