| 摘要 |
PCT No. PCT/EP95/04871 Sec. 371 Date Jun. 9, 1997 Sec. 102(e) Date Jun. 9, 1997 PCT Filed Dec. 11, 1995 PCT Pub. No. WO96/18471 PCT Pub. Date Jun. 20, 1996The invention pertains to a drilling tool for drilling in solid metal. It comprises a base body with flutes for chip removal and two interchangeable inserts (1) designed especially as reset bits, having the same shape and size and being arranged in a recess at the end of a flute at the front of the base body. The inserts (1) are situated at different radial distances from the drilling tool axis (30) with overlapping work ranges. The blade (4,4a) of the insert (1) is formed by two cutting edges (10, 10a) and (14, 14a) which together form an obtuse point angle (18). The insert (1) is characterized by an extended form in its longitudinal direction L with channel-like troughing of its faces (3) running essentially in the longitudinal direction and by an arrangement of the blades (4,4a) at the channel ends. Furthermore, the channel has a base surface (9) which with its longer parallelogram sides (6,7) forms an acute angle (8) with the longitudinal axis (2) of the insert (1). The shorter parallelogram sides form the one cutting edge (10, 10a ) of an insert blade (4, 4a ). The channel also comprises two lateral faces (12, 12a) flanking the longer parallelogram sides (6, 7) of the base surface (9), rising at an obtuse angle (31) from the base surface (9) and in each case forming an obtuse triangle. The base of this triangle coincides with one of the longer parallelogram sides (6, 7) in each case. The short legs of this triangle form other cutting edges (14, 14a ) which together with an adjoining shorter parallelogram side of the base surface (9) form an insert blade (4, 4a ). |
