Cutting by use of rotating axially moving tool – With means to apply transient – fluent medium to work or product – Including tool with duct
Reexamination Certificate
2003-08-26
2009-08-18
Howell, Daniel W (Department: 3726)
Cutting by use of rotating axially moving tool
With means to apply transient, fluent medium to work or product
Including tool with duct
C408S230000, C408S713000
Reexamination Certificate
active
07575400
ABSTRACT:
The invention relates to a dual-cutting drilling tool. The drilling tool comprises a base body (14) which is rotatable about a drill axis (36) and in which two plate seats (16) are arranged on the front face thereof for receiving identically configured alternating cutting plates (16). The alternative cutting plates are respectively provided on a main cutting edge (28) thereof with an adjacent first face (30), forming a cutting wedge, and a free surface (24). The main cutting edges (28) of the alternating cutting plates (20) complement each other in the region of a central, offset cutting part (28′), forming a cross-cutting edge which is interrupted by a center hole (60). The aim of the Invention is to reduce the risk of breakage in the center area of the alternating cutting plates and to provide better guidance for the tool. According to the invention, slanting guiding inclinations (56) are provided on the free surface of the alternating cutting places (20), extending from an apex line (54) to the center corner (46) of the plates. The free surfaces (24) are positively inclined in a radially outer region in the direction of advancement and are negatively inclined in the region of the guiding inclinations (56) thereof.
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Kruszynski Jacek
Leuze Peter
Morlok Helmut
Schuett Henry
Flynn ,Thiel, Boutell & Tanis, P.C.
Howell Daniel W
Komet Group Holding GmbH
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