Rolling pass system for deformed channel steel

Abstract

The present invention discloses one kind of rolling pass system for deformed channel steel with leg length/channel width ratio of 0.8-1.1 in small scale rolling mill. The rolling pass system consists of directly deepening coarse rolling pass, butterfly type middle rolling pass arranged in narrow-wide-narrow rule and straight leg finish gage pass with optimized nip condition. The present invention has improved deforming condition to realize rolling large steel material in small rolling mill, and has the positive effects of raising rolling capacity of rolling mill, reducing pass height, reducing depth of roller slot, decreasing rolling load, etc.

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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