shaving tool

A shaving tool is a die component that makes a second pass over the perimeter of a stamped or pierced part to remove a thin layer of material, typically 0.005 to 0.030 inches, left behind by the blanking or piercing punch. Unlike the main cutting edges that produce the initial cutout, the shaving tool operates at a slightly different clearance and encounters metal that is already partially separated, allowing it to shave away burrs, clean the edge, and achieve a finished dimension with tighter tolerance.

In a progressive die or compound die, the shaving tool sits in a separate station downstream from the blanking punch, or sometimes in the same station on a floating die. The tool works on the already-cut perimeter rather than shearing through full stock thickness. This two-stage process is more economical than trying to achieve a burr-free, finished edge in a single punch, since a blanking punch designed to cut clean would wear rapidly and require higher press tonnage than the blanking operation alone.

Material removal and edge quality

The shaving tool produces a sheared face rather than a machined surface. Material removal rates are low, typically a few ten-thousandths of an inch per edge. The tool must be kept sharp; dull shaving tools leave torn fibers rather than clean shearing, and this roughness can cause problems in subsequent forming, fastening, or plating operations. The amount of stock left for shaving is controlled by the blanking punch clearance and is commonly called the shaving allowance.

Common work materials include mild steel, stainless steel, and aluminum. The shaving tool itself is ground from tool steel or carbide and must maintain very close tolerances to the punch, as excessive clearance allows the part to shift during shaving and produces an uneven edge. Press control is important: if the shaving stroke is too short, the tool does not fully engage; if too long, it can dull unnecessarily or bend the freshly cut edge.

Shaving tools are most cost-effective on mid-volume to high-volume runs where die complexity is justified. On low-volume work or where edge finish is less critical, blanking alone may be sufficient. The term shaving reflects the light, finishing nature of the operation, borrowing from manual tool terminology where shaving removes only surface material.