A rolling pass system for special-shaped channel steel

Abstract

The invention discloses a special-shaped channel-steel pass system capable of smoothly rolling out a special cross-section between leg length / waist width=0.8-1.1 by using a rolling mill with a smaller specification. The present invention is composed of directly cut deep rough rolling holes, butterfly middle rolling holes arranged according to the rule of narrow-width-narrow, and straight-leg finished holes with optimized rolling mill biting conditions. It can be fully utilized, and the rolled piece can be forced to extend to the horizontal section. At the same time, the straight-leg control port is canceled, so that the rolled piece can be rolled through several butterfly holes with control ports alternately facing in turn, and then directly enter a straight-leg finished hole for rolling. This can fully improve the deformation conditions of the rolling mill, realize the rolling of large materials in small rolling mills, improve the capacity of the rolling mill and the technical and economic indicators, and bring about a lower pass height, shallower grooves on the rolls, and reduced rolling loads, etc. positive effect. Compared with the channel steel of the existing standard section, the invention can produce the special-shaped channel steel with thinner and longer legs, smaller inclination of the inner side of the legs and thicker waist.

Description

technical field [0001] The invention belongs to the technical field of rolling channel steel, and more specifically relates to the technical field of special-shaped channel steel rolling pass system. Background technique [0002] Maanshan Iron & Steel Co., Ltd. was entrusted by Chery Automobile Co., Ltd. to trial-produce a channel steel with a special cross-section for automobiles. The steel grade is equivalent to GBQ345, but the shape and size of the end face of the channel steel are also very different from the channel steel with the closest domestic standard cross-section shape. s difference. See figure 2 , image 3 , figure 2 It is the section shape of the channel steel required by Chery, the waist width h is 79mm, the waist thickness d is 11.0mm, the leg length b74mm, and the average leg thickness t is 5.35mm; image 3 for domestic and figure 2 The cross-sectional view of the standard channel steel with the closest shape, the waist width h is 80mm, the waist thickn...

AI Technical Summary

Problems solved by technology

[0005] However, this pass system does not make full use of the advantages of the bent leg section, and there are two straight leg control ports before the final finished hole, that is to say, the rolled piece must be straight before the finished product, so the pass system and Compared with the straight-leg slotted hole system, the width direction of the pass pattern is increased greatly, while the height direction is limited.

Therefore, this kind of pass system cannot smoothly roll the Chery channel steel of the aforementioned shape and size.

Because: 1. The pass system is designed to match the channel steel with standard section. Compared with the channel steel with longer legs, the pass height is still higher, and the roll groove is still deeper; 2. The pass system is rolled For channel steel with a thick waist and thin legs, it will be difficult to straighten the rolled piece because the waist is too thick, and defects such as waves and thinning will easily occur if the legs are too thin

3. The slope of the inner wall of the channel steel is smaller, and the rolling difficulty is more difficult. However, the above-mentioned patented technical solution is to roll a channel steel with a larger slope of the inner wall through a large-slope pass. It is difficult to use such a pass. Rolling the rolled piece with a small slope on the inner side wall

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