Medium and thick plate roller type hot straightening machine: tips for accurate calculation of straightening force
In today's steel production process, the straightening of plates has become a link that cannot be ignored. Whether in construction, manufacturing or other industries, flat medium and thick plates can improve the efficiency of subsequent processes and product quality. The medium and thick plate roller type hot straightening machine is a high-tech equipment which is born to solve the problem of plate bending. It makes the plate return straight by applying an external force to ensure the stability and aesthetics of the final product.
The calculation of straightening force is one of the key techniques in the operation of the hot straightening machine of medium and thick plate roll. In order to achieve the ideal straightening effect, it is necessary to master the mechanical properties of the material, especially to understand the basic parameters such as elastic modulus, yield strength, thickness and width of the plate. When the bending deformation of a medium thick plate occurs, the external force is applied to the straightening roller, and the plate will bend in the opposite direction to achieve correction.
Understanding the physical principles behind these can make us more comfortable in practical applications. According to the bending theory of material mechanics, if we assume that the plate is an ideal elastic-plastic material, the size of the straightening force is closely related to the degree of deformation and material characteristics, and the plate will have plastic deformation when the bending moment caused by the external force exceeds its yield bending moment during the straightening process.
When calculating the elastic limit bending moment of medium and thick plates, we usually use a simple formula involving variables such as yield strength, width and thickness. For example, for a medium and thick plate with a rectangular section, the elastic limit bending moment is calculated as: bending moment = yield strength × width × thickness. With this formula, we can initially assess the response of the sheet to the application of external forces.
If the five-roll straightening machine is taken as an example, the process of calculating the straightening force will be relatively complicated. Assuming that the radius of the straightening roll is R and the distance between the adjacent rolls is D, the straightening force is calculated as follows: Straightening force = correction factor x sum of the radii of all the rolls involved in straightening. These parameters directly affect the amount of external force required in the straightening process. Especially when the coefficient of friction is taken into account, the calculation of the straightening force is no longer a simple numerical addition, and friction causes a significant increase in the force required to be applied, which needs to be adjusted accordingly.
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