Channel steel is a long strip steel with groove section, which belongs to carbon structural steel for construction and machinery. It is a section steel with complex section, and its section shape is groove shape. Channel steel is mainly used for building structure, curtain wall engineering, mechanical equipment and vehicle manufacturing.
1. In view of the slow cooling speed of the cooling bed, a water mist fan is added in the cooling bed area to improve the cooling speed of the cooling bed area, and a group of water mist nozzles are added at one ruler in front of the shear to reduce the temperature of the shear part of the channel steel, so as to avoid the shear defects caused by the high steel temperature.
2. In view of the problems existing in the design of channel steel shear blade, combined with the actual production situation, the shear blade is designed as the shape shown in Figure 2 (taking 100# channel steel as an example). The width of the upper shear edge is changed from 100mm to 99mm to reduce the gap between the upper shear edge in the left and right directions and improve the shear quality of the two corners of the channel steel; The circular arc size of the two corners of the lower shear edge is changed from r8mm to r7mm to improve the shear overlap of the two corners and the shear quality of the shoulder of the channel steel; The upper width of the lower shear edge is changed from 79mm to 80mm, and the lower width is changed from 97mm to 94mm, so that the slope of the leg end of the lower shear edge is less than the slope of the finished channel steel pass. In this way, when the leg is cut, the upper and lower directions of the leg will not be stressed at the same time, so as to reduce the shear force and improve the shear quality.
3. Through the data regression analysis of the actual shear quality and shear clearance of each specification of channel steel, the shear clearance specifications of each specification are formulated, specifically: 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 thickness of 0.20 ~ 1.00mm are made. When replacing the cutting edge each time, measure the clearance first, and then select the corresponding gasket to ensure that the shear clearance is controlled within the process requirements.