Production method of H-shaped steel beams

H-shaped steel can be produced by two methods: welding or rolling. Welding H-shaped steel is the process of cutting a strip of steel with appropriate thickness into a suitable width and welding the flange and web together on a continuous welding machine. Welding H-shaped steel has drawbacks such as high metal consumption, difficulty in ensuring uniform product performance, and limited size specifications. Therefore, H-shaped steel is mainly produced by rolling method. In modern steel rolling production, universal rolling mills are used to roll H-beams. The web of H-shaped steel is rolled between the upper and lower horizontal rollers, and the flange is simultaneously rolled and formed between the side of the horizontal roller and the vertical roller. Due to the fact that using only a universal rolling mill cannot apply pressure to the edge of the flange, it is necessary to install an edge rolling machine, commonly known as an edge rolling machine, behind the universal frame in order to apply pressure to the edge of the flange and control the width of the flange. In actual rolling operations, these two stands are used as a group to make the rolled piece pass back and forth several times (Figure 2a), or to make the rolled piece pass through a continuous rolling unit composed of several universal stands and one or two edge rolling stands. Each pass applies a certain amount of pressure to roll the blank into the desired shape and size of the product. At the flange of the rolled piece, due to sliding between the side of the horizontal roller and the rolled piece, the wear of the roller is relatively large. In order to ensure that the roll after heavy rolling can return to its original shape, the sides of the upper and lower horizontal rolls of the rough rolling unit and their corresponding vertical roll surfaces should be inclined at an angle of 3 ° to 8 °. To correct the inclination angle of the finished product flange, a universal rolling mill, also known as a universal finishing mill, is set up. The side of the horizontal roller is perpendicular to the axis of the horizontal roller or has a small inclination angle, generally not greater than 20 ', and the vertical roller is cylindrical