| 摘要 |
A metal cutting insert having a pair of cutting portions disposed on either side of a shank portion. Structure is formed on the metal cutting insert by which the insert is clamped to a tool holder which positions one of the cutting portions in a machining position. Each cutting portion includes a forward cutting edge and two side cutting edges. Each side cutting edge forms part of a shelf that includes chip controlling/breaking structure. Each side cutting edge is defined by the juncture of a cutting surface with an upper boundary of a side face and the chip controlling structure includes a chip deflecting surface located adjacent the side cutting surface that includes a plurality of concave recesses that generate localized stiffening of a chip as it moves along the chip deflecting surface. The forward cutting edge performs cutting operations on a rotating workpiece in a radial direction. Chip controlling structure located adjacent the forward cutting edge includes a downwardly sloping surface that forms part of a channel which extends from the forward cutting edge towards a shank portion of the insert. A pair of ridges located on either side of the channel rise upwardly and reach a height that is above the plane of the forward cutting edge. The width of the channel decreases in width for a portion of its extent. The ridges support and deflect a chip created by the forward cutting edge and generate localized stiffening of the chip in the region of the chip that is unsupported by the ridges. Radiused corner surfaces are provided which are especially effective as chip controlling surfaces during shallow turning operations.
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