| 摘要 |
A workpiece can be slotted and parted-off in various ways, for instance either plastically or by mechanically machining the workpiece with the aid of cutting inserts. Parting-off of a workpiece is effected in a manner corresponding to a normal lathe turning operation, in which the cutting insert, or lathe tool, is fed inwards after each revolution of the workpiece, through a distance which is equal to the thickness of the chip or swarf removed. The cutting tip of an indexable insert is normally ground to the width which corresponds to the space between flanks. With the intention of improving cutting insert economy with simplified manufacture, the inventive exchangeable insert (1) has been configured generally symmetrical in the form of a four-cornered plate with four cutting edges (4) in each corner and with plane-parallel abutment surfaces (5) disposed between the cutting edges and at right angles to each other. This results in a high degree of accuracy with respect to position and direction when attaching the cutting insert to the holder (3). Manufacture of the cutting insert is simplified considerably, by gathering several insert blanks into a pack and first grinding the blanks simultaneously to their correct external shape and then fitting each insert-blank in a fixture in a diamond pattern, in which the edges of each insert-blank can be ground individually to its intended form. |
