Solid drill with indexable insert

Abstract

The invention relates to a solid drill with an indexable insert comprising four identical cutting edges (30) arranged at a distance above a supporting base (42) and each extending between two cutting-edge corners (28 ', 28 ''). The cutting edges are each bounded by a cutting face (46) and a clearance face (48), with the inclusion of a wedge angle (belta). Of the cutting edges (30), one in each case is in an active operating position during the drilling operation. To permit optimum adaptation to the cutting conditions and drilling characteristics, varying over the length of the cutting edge of the drilling tool, it is proposed according to the invention that the height (h) of the four cutting edges (30), measured from the plane of the supporting base (42), and/or the clearance angle (alpha) varies over the length of the respective cutting edges (30).

Description

[0001] This application is a divisional application of the Chinese invention patent application with the application number "200780034776.3". The filing date of the original application is August 31, 2007 (the PCT international application date), the application number is "200780034776.3" (the PCT international application number is PCT / EP2007 / 059108), and the name of the invention is "Indexable blade and the Application of Indexable Inserts in Solid Drills". technical field [0002] The invention relates to a solid drill bit with indexable inserts, the indexable inserts have a support base, four side support surfaces protruding from the support base and four identical cutting edges arranged at a certain height above the support base distance, extending between the two tool tips respectively, and each cutting edge passes through a rake face ( cutting face) and a flank face ( free surface), and of these cutting edges, there is always a cutting edge in the actual use positio...

AI Technical Summary

Problems solved by technology

However, these measures are limited because the four-fold symmetry of the insert in the region of the cutting edge requires restrictions in terms of shape and because, in order to achieve sufficient clamping precision, only relatively simple contour shapes are permitted for the insert seat

On the other hand, during drilling with solid drills of this type, different cutting speeds occur from the inside to the outside due to the characteristic conditions of their geometry, which lead to differences along the effective cutting edges of the known indexable inserts. wear and tear

Furthermore, in the case of square indexable inserts, unlike the known triangular inserts with arrow-tip-shaped cutting edges, problems arise especially with regard to the centering of the drill at the start of drilling, which have been used hitherto measures have not satisfactorily addressed the

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