I beam pass design

The specifications of the I-beam are expressed by the centimeter value of the waist width, such as the No. 10 I-beam, whose waist width is 10cm. The types of I-beams are hot rolled ordinary I-beams, light I-beams and wide parallel leg I-beams (H-beams). The waist width of China's hot-rolled ordinary I-steel is 100 ~ 630mm, expressed as No.10 ~ No.63, and the slope of the inner side wall of the leg is 1:6. The pass system of rolling I-steel includes straight rolling pass system, diagonal rolling pass system and mixed pass system. In addition, I-beams can also use special rolling methods.

(1) Straight rolling pass system. The straight rolling pass system refers to the pass system in which the two open legs of the I-beam pass are on the same side of the roll axis at the same time and the waist is parallel to the roll axis.

Its advantages are that the roll axial force is small, the axial movement is small, there is no need for working bevel, the pass occupies the length of the roll body is small, and the roll body length can be matched with more passes under the condition of a certain length.

(2) cross rolling pass system. The pass system means that the two open legs of the I-beam pass are not in the same side of the waist at the same time, and the waist has an Angle with the horizontal axis.

(3) Mixed pass system. According to the characteristics of the rolling mill and the product, in order to give full play to the advantages of their respective systems and overcome the disadvantages, the mixed pass system is often used, that is, the combination of more than two systems. For example, the finished hole and the finished front hole adopt a straight leg diagonal rolling pass system, and other passes adopt a curved leg diagonal rolling system; Or the rough-rolling hole adopts the straight rolling system, and the last 3 to 4 fin-rolling holes adopt the straight leg diagonal piercing.

(4) Special rolling method. For some reason, when it is difficult to roll out the required I-steel by the usual rolling method, a special rolling method can be used to make full use of the skills of uneven deformation and pass design. For example, when the billet section is narrow and the wider I-beam steel is required to be rolled, the wave rolling method can be used; For example, when the billet is wider and smaller I-beams are required to be rolled, negative width spreading rolling can be used.