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Metal Fabrication Processes - Metal Slitting and Shearing, Coil Slitting, Foil Slitting, Film Slitting
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Slitting is a shearing process, but rather than making cuts at the end of a workpiece like shearing, slitting us used to cut a wide coil or sheet of metal, foil or plastic into a number of narrower coils as the main coil is moved through the slitter. During the slitting process, the metal coil or plastic coil passes lengthwise through the slitter's circular blades. Slitting of heavier gauge metals can be accomplished with a machine quipped with shearign rolls instead of blades.
The slitting process characteristics include:
- being restricted to cutting relatively thin materials (up to about 3mm),
- leaving left-over burrs on slit edges of the narrower coals,
- its ability to be used on both ferrous and nonferrous metals,
- its categorization as a high production designed to control metal coil width.
Slitting can be used equally well for both sheet or coil rolls. Materials that can be slit include metals, foils, plastic films and plastic sheets. Slit rolls are typically rewound onto a smaller roll ready for use.
Slitting blades are designed depending on the job required. The three critical determinants of the blade configuration include:
- The workpiece material thickness
- The type of material to be slit
- The tolerances that must be held while slitting.
The slitting process is often used inline with another automated production process such as roll forming or CNC punching or folding to economically produce finished components.
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