Method for designing roller shape of two-roller straightener concave roller

Abstract

The invention relates to a method for designing a roller shape of a two-roller straightener concave roller and belongs to the technical field of two-roller straighteners. The method comprises the following steps that firstly, stress distribution of bar material straightening actual deformation is determined; secondly, a formula of a straightening reverse bending ratio is determined according to bar material straightening deformation characteristics; thirdly, on the basis, combining abrasion of straightening force on a roller face, residual stress and influence of an elastic core on hidden danger deflection, the reverse bending ratio of a roller lumbar segment is determined; finally, the reverse bending ratios of the roller lumbar segment and a roller thoracic segment are determined by a remnant curvature formula. The reverse bending ratios of all segments are related with the following variates : Cw = {delta, eta, sigma<t>, sigma<6> epsilon<t>}, wherein the delta is an elastic region ratio, the eta is a ratio of the maximum deformation stress to yield limit, the sigma<t> is the yield limit, and the sigma<6> epsilon<t> is the straightening maximum deformation stress corresponding to the <6> epsilon<t>. On the premise of ensuring the stable straightening quality, the straightening straightness accuracy of the bar materials is improved, the abrasion on the rollers is reduced, the import amount of foreign straightening rollers is reduced, and the enterprise cost is saved.

Description

technical field [0001] The invention belongs to the technical field of two-roll straightening machines, and in particular relates to a design method for a concave roll profile curve of a two-roll straightening machine. Background technique [0002] Bars are affected by various factors during rolling, heat treatment, and transportation, and often have defects in shape and multi-directional bending. In order to eliminate these defects and obtain high-quality finished products, bars need to be straightened on a straightening machine . The straightening roller is the key part of the two-roller straightening machine. Its main function is to cause multiple continuous elastic-plastic deformations of the bar to achieve the purpose of straightening. In the straightening process, the concave roll plays a key role in the bending and straightening of the bar. The design of the convex roll is more and more simple and practical because it only supports the bar. Therefore, the two-roll st...

AI Technical Summary

Problems solved by technology

Equal curvature anti-bending roll shape is designed based on the principle of full contact and plane meshing. The solution to the geometric relationship of the roll shape is accurate, but it is difficult to determine the anti-bending rate ratio for different specifications of bars

At the same time, the description of the material properties in the design of the single arc and equal curvature reverse bending rolls is not accurate enough, and the hardening phenomenon of the material is not considered, resulting in poor straightening accuracy of the bar, which cannot meet the current requirements for high-precision bars

[0003] As far as we know, there is no literature so far to establish the anti-bending rate ratio model with hardening coefficient and the hidden deflection prediction model of bar straightening, and predict the secondary recovery of different grades and specifications of bars to ensure the stability of straightening quality

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