Channel Steel Improvement Measures

1. In view of the slow cooling speed of the cold bed, the water mist fan is added in the cold bed area to improve the cooling speed of the cold bed area, and a set of water mist nozzle is added at a double size in front of the shear machine to reduce the temperature of the shear part of the channel steel, thus avoiding the shear defect caused by high steel temperature.
2. In view of the problems existing in the design of channel steel cutting edge, combined with the actual production situation, the cutting edge is designed as the shape shown in Figure 2 (taking 100# channel steel as an example). The width of the upper cutting edge is changed from 100mm to 99mm, the gap between the upper cutting edge and the left and right direction is reduced, and the shearing quality of the two corners of the channel steel is improved. The arc size of the two corners of the lower cutting edge is changed from R8mm to R7mm, which increases the shear overlap of the two corners and improves the shear quality of the channel steel shoulder. The upper width of the lower cutting edge is changed from 79mm to 80mm, and the lower width is changed from 97mm to 94mm, so that the slope of the lower cutting edge leg is less than the slope of the finished channel steel pass, so that when the leg is cut, the upper and lower parts of the leg will not be stressed at the same time, thereby reducing the shear force and improving the shear quality.
3. Through the data regression analysis of the actual shear quality and shear gap of channel steel of each specification, the shear gap specifications of each specification are formulated, which are as follows: 63# channel steel is 0.20 ~ 0.30mm, 80# channel steel is 0.20 ~ 0.35mm, 100# channel steel is 0.25 ~ 0.35mm, 120# channel steel is 0.25 ~ 0.40mm, and different gaskets with a thickness of 0.20 ~ 1.00mm are made. Each time the cutting edge is replaced, the clearance is measured first, and then the corresponding gasket is selected to ensure that the shear clearance is controlled within the process requirements.