Three-strand splitting rolling method for ribbed steel bar

Abstract

The invention relates to a method for rolling rib steel bar, wherein it is characterized in that: the last rolling machine at middle roller group uses the square holes as R 6-9mm, depth 1-2mm, and same central distance and convex degree; the first one of fine roller group uses the flat holes with R 7-12mm, depth 2-5mm, unequal arc radials at left and right convex degree, and central distance larger than precutting hole, tangent hole and central distance is 1-2mm; the precutting hole has three same high lines and inner-outer angle difference at 2-4 degree of wedge sharp; the tangent hole is ellipse hole whose height-width ratio is 1. 02-1. 1 and three lines are same high. The invention can uniform rolling abrasion and low section error of tangent three rolled elements.

Description

technical field [0001] The invention belongs to the technical field of split rolling of ribbed steel bars, and in particular relates to a three-wire split rolling method of ribbed steel bars. Background technique [0002] The three-line slit rolling of ribbed steel bars is to use the special pass shape of the rolls in the rolling process to roll a billet longitudinally into Three parallel rolled pieces of the same shape and size are divided into three single rolled pieces by the splitting wheel installed behind the slitting hole, and then three finished products are rolled out through subsequent passes. At present, the three-wire slitting rolling technology mainly has the following problems: (1) The uneven deformation of the pre-cut hole is serious, resulting in uneven wear of the rolling groove, especially the wear of the inner and outer sides of the rolling groove of this pass type is not synchronized, and the outer wear is more than the inner wear large; (2) The rolled p...

AI Technical Summary

Problems solved by technology

At present, the three-wire slitting rolling technology mainly has the following problems: (1) The uneven deformation of the pre-cut hole is serious, resulting in uneven wear of the rolling groove, especially the inner and outer wear of the groove tip of the pass is not synchronized, and the outer wear is more than the inner wear large; (2) The rolled piece coming out of the vertical rolling hole enters the pre-cut hole with poor alignment, which makes the cross-sectional area error of the three rolled pieces after cutting larger, and is prone to product defects; (3) The rolled piece coming out of the cutting hole After the pieces are separated, they enter the next stand for rolling. The connecting strip of the rolled piece is not easy to be fully processed, and it is easy to produce folding defects in the finished product.

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