Model for predicting resilience of bar subjected to two roll straightening
A bar and straightening technology, applied in special data processing applications, instruments, electrical and digital data processing, etc., can solve the problems affecting the calculation accuracy of springback, offset, and the distribution of stress on the section of the bar.
Active Publication Date: 2015-08-26
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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At the same time, the neutral layer will shift to the compression side during the straightening process, which will affect the stress distribution of the bar section, and then affect the calculation accuracy of the springback
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[0046] According to the bar material and specifications produced by a steel factory, alloy steel 40Cr was selected for springback verification. The specific parameters are as follows: yield limit =410MPa, modulus of elasticity E =206GPa, hardening coefficient =0.02812, diameter d =28mm, the original deflection is 10mm / m.
[0047] According to the above data, in the reverse bending radius =915mm, the springback deflection is calculated according to the formula =4.51mm; the experimental value is 4.34mm, and the relative error is 3.92%.
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The invention relates to a method for predicting resilience of a bar subjected to two roll straightening, and belongs to the technical field of two-roll straightening machines. The method comprises the followings steps: firstly, determining the offset of a stress neutral layer when the rod is subjected to straightening; then, determining a deformation-hardening coefficient and tension-compression stress distribution according to different straightening processes and deformation characteristics of rods in different specifications; finally, determining the model for predicting rebound bending moment and straightening rebound deflection by combining a pure bending and rebound theory, wherein the rebound deflection delta is related to the following variables of R, sigma<t>, lambda, xi, psi, kappa, I, E, L, B, n, R0, Rw, P and tau; R represents a rod radius; sigma<t> represents the yield limit; lambda represents a hardening coefficient; xi represents an elastic region ratio; psi represents a neutral layer offset radius ratio; k represents an anti-bend rate; I represents rod section moment of inertia; E represents modulus of elasticity; L represents the distance between the two end points in three-point bending; B represents a plastic coefficient; n represents a hardening index; R0 represents an initial bending radius; Rw represents an anti-bend radius; P represents straightening force; tau represents a correction coefficient. According to the method, a straightening and deformation process can be truly reflected, and the straightening theory can be perfected; resilience in the straightening process can be accurately predicted, and bases for the roll shape design and process parameter establishment are provided.
Description
technical field [0001] The invention belongs to the technical field of two-roller straightening machines, and in particular relates to a method for establishing a springback prediction model for bar two-roller straightening and an accurate calculation method for the springback amount. Background technique [0002] With the rapid development of society and the domestic machinery industry, the demand and quality requirements for high-strength alloy steel bars are increasing day by day, among which the straightness requirement reaches 1mm / m, or even less than 0.5mm / m, otherwise the removal of materials in subsequent processing The amount is very large, the loss is serious, and the cost increases sharply. Therefore, the requirements for the straightness of the bar after straightening are very strict. Two-roll straightening, as the last process of bar finishing, is the key technology to ensure the straightness index of bar after straightening. At the same time, two-roll straighte...
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Inventor 范沁红马自勇马立峰黄庆学马立东王荣军
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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