Shearing is a metal fabricating process used to cut straight lines on flat metal stock. During the shearing process, an upper blade and a lower blade are forced past each other with the space between them determined by a required offset. Normally, one of the blades remains stationary.
The shearing process characteristics include:
The illustration that follows provides a two-dimensional look at a typical metal shearing process. Note how the upper shear blade fractures the metal workpiece held in place by the workholding devices. The sheared piece drops away.
Typically, the upper shear blade is mounted at an angle to the lower blade that is normally mounted horizontally. The shearing process performs only fundamental straight-line cutting but any geometrical shape with a straight line cut can usually be produced on a shear.
Metal shearing can be performed on sheet, strip, bar, plate, and even angle stock. Bar and angle materials can only be cut to length. However, many shapes can be produced by shearing sheet and plate.
Materials that are commonly sheared include:
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