In the process of sheet slitting line processing and shear production, many processing centers will have some similar common problems, regardless of the differences of equipment itself.

For example, burrs, sickle bending, winding staggered layers, multiple winding irregularities, edge waves after longitudinal shearing, etc., the most common of which are burrs and sickle bending.

What are burrs and camber? Burrs and camber in shearing process are similar to defects of main production line (continuous retreat, hot rolling, etc.) in steel mill, but slightly different.

A spiral impression appears on the edge. When the coil is unfolded, it will be found that the section at the edge of the strip is inconsistent. One section is all cut-off surface, and the other section is all tear surface. The burr of the whole steel strip section is also very large, and the width tolerance varies greatly, which is essentially a manifestation of sickle bending.

Similar fluctuations in cut-off surface and width do not affect the use of less demanding users. However, it will have a negative impact on the follow-up processing of high precision and high quality (such as high requirements for sickle bending when making shelves, and pits when making punching burrs fall), let alone the production of products with shear accuracy exceeding 0.1 MM.

Analysis of burr and camber defects in longitudinal cutting

The investigation and improvement of longitudinal burr and sickle bend are mainly focused on the longitudinal blade and its accessories. We can check by detecting and controlling some key parameters.

After inserting the blade, the clearance of different angles of the same cutting edge is measured. The clearance of the blade is measured once every 90 degrees of rotation. The structure shows that the difference between the minimum and maximum clearance is 0.12 mm among the four measuring points.

The discrepancy of blade clearance will affect the stress distribution of the slitting blade during shearing and the stability of the long-term operation of the blade. In the shearing process, the cutting edge is in a curved state, which not only causes burrs and sickle bending, but also leads to side waves.

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