I-beam pass design

 I-beam pass design

The specification of the I-beam is expressed in centimeters of the waist width, for example, the No. 10 I-beam has a waist width of 10cm. The types of I-beams are hot-rolled ordinary I-beams, light-duty I-beams, and wide parallel-leg I-beams (H-beams). The waist width of hot-rolled ordinary I-beams in my country is 100-630mm, expressed as No.10-No.63, and the slope of the inner wall of the legs is 1:6. The pass system for rolling I-beams includes direct rolling pass system, skew 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 opening 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.

The advantage is that the axial force of the roll is small, the axial movement is small, no working inclined surface is required, the length of the roll body occupied by the pass is small, and more pass types can be equipped under the condition of a certain length of the roll body.

(2) Cross rolling pass system. This pass system means that the two opening legs of the I-beam pass are not on the same side of the waist at the same time, and there is an angle between the waist and the horizontal axis.

(3) Mixed pass system. According to the characteristics of rolling mills and products, in order to give full play to the advantages of their respective systems and overcome their shortcomings, a mixed pass system is often used, that is, a combination of more than two systems. For example, the finished hole and the front hole of the finished product adopt the straight leg oblique rolling pass system, and the other pass adopts the bent leg oblique rolling system; or the rough rolling hole adopts the straight rolling system, and the last 3 to 4 finishing holes adopt the straight leg oblique rolling hole, etc. .

(4) Special rolling method. For some reason, when it is difficult to roll out the required I-beam 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 section of the billet is narrow and a wider I-beam is required to be rolled, the wave rolling method can be used; for example, when the billet is wider and a smaller I-beam is required to be rolled, negative width rolling can be used System etc.