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...

Examples

Embodiment Construction

[0023] On the φ300mm×4 tandem rolling mill, the steel grade is GBQ345, and the billet of 120×120mm is selected, and the second fire is used to form the material.

[0024] Such as figure 1 The pass system shown is designed as:

[0025] Rough rolling: box-shaped hole K13, pre-cut hole K12, deep-cut hole K11, K10, K9, K8, the slope of the side wall of each deep-cut hole is designed between 18-20%, and the above-mentioned deep-cut holes and other pass types Distributed on the first rolling mill, the reduction of each hole on the first rolling mill is larger than that of other rolling mills, the average elongation coefficient can be set to about 1.3, and the reduction of each pass should be as uniform as possible, which can reduce the subsequent The reduction amount of the pass is to reduce the problem of large pass current and rolling mill bounce, and to roll out a sufficient amount of leg length for billet opening.

[0026] Middle rolling: The middle rolling holes K7, K6, K5, ...

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...

Examples

Embodiment Construction

[0023] On the φ300mm×4 tandem rolling mill, the steel grade is GBQ345, and the billet of 120×120mm is selected, and the second fire is used to form the material.

[0024] Such as figure 1 The pass system shown is designed as:

[0025] Rough rolling: box-shaped hole K13, pre-cut hole K12, deep-cut hole K11, K10, K9, K8, the slope of the side wall of each deep-cut hole is designed between 18-20%, and the above-mentioned deep-cut holes and other pass types Distributed on the first rolling mill, the reduction of each hole on the first rolling mill is larger than that of other rolling mills, the average elongation coefficient can be set to about 1.3, and the reduction of each pass should be as uniform as possible, which can reduce the subsequent The reduction amount of the pass is to reduce the problem of large pass current and rolling mill bounce, and to roll out a sufficient amount of leg length for billet opening.

[0026] Middle rolling: The middle rolling holes K7, K6, K5, ...

Images