Incomplete cutoff of material causes a cutoff projection. Solidification or redeposition of material results in a recast bead. Plastic deformation of material includes lateral flow (Poisson burr), bending (rollover burr), and tearing of material from the workpiece (tear burr). Burrs may be classified by the physical manner of formation. There are three types of burrs that can be formed from machining operations: Poisson burr, rollover burr, and breakout burr. In the printmaking technique of drypoint, burr, which gives a rich fuzzy quality to the engraved line, is highly desirable-the great problem with the drypoint medium is that the burr rapidly diminishes after as few as ten impressions are printed. Deburring accounts for a significant portion of manufacturing costs. It may be present in the form of a fine wire on the edge of a freshly sharpened tool or as a raised portion of a surface this type of burr is commonly formed when a hammer strikes a surface.
Burrs are most commonly created by machining operations, such as grinding, drilling, milling, engraving or turning.
It is usually an unwanted piece of material and is removed with a deburring tool in a process called 'deburring'. Metal burr extending beyond the edge of the cut piece, view on the cut face (top) and from the bottom (bottom)Ī burr is a raised edge or small piece of material that remains attached to a workpiece after a modification process.
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