![]() This is the telltale sign of whether your set up is correct. The fourth component of the slitting process is the burr. When performed correctly, the slit edge will have a shiny shear zone, a darker fracture zone, and a defined straight line separating the two. Consequently, the fracture will not go to your slitter knives - your slitter knives must go to or line up with the fracture. Materials typically fracture at 7 deg to 9 deg depending on the type of material being slit, whether your knives align with the fracture plane or not. Not only is it the largest zone within the slitting process, it is also largely out of your control. The fracture zone is normally the largest zone within the slitting process. When the compressive forces exceed the material’s ultimate tensile strength, a fracture takes place. When looking at the edge of the strip, this is the shiny area. Secondly, a portion of the edge is burnished, which is sometimes referred to as the shear zone. The knife contact area deforms the material, which in turn creates the rollover. The rollover is the initial step when the knives come in contact with the material. The first two components of the process are rollover and burnish. The process of slitting is actually comprised of four separate and distinct components. When done correctly, you can produce a high quality cut with little or no burr. ![]() In order to actually cut the material, sufficient compressive forces must be applied to cause it to fracture. Slitting is not simply a function of shearing the material in two. To fully understand the slitting/shearing process is to understand fracture mechanics. To properly manage all of these variables on a day-to-day basis under the pressures of meeting a production schedule truly makes slitting an art. Horizontal knife clearance, depth of penetration, size of the stripper rings, material characteristics, as well as the slitting head or shear itself will all enter into the equation. When slitting or shearing material, many factors must be taken into consideration in order to produce a quality slit or sheared edge. ![]() Lubricants, Coolants, Metalworking Fluids.Computerized Maintenance Management Systems.Abrasives, Belts, Brushes, Grinding Wheels. ![]()
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