Milling head with through hole having centering and drive surfaces at tooth-receiving lobes, tool holder and rotary milling tool
AssigneeIscar, Ltd.
InventorMARTIN ULRICH ZETTLER
Life of this patent
Estimating the term…
Abstract
A rotary milling tool has a tool holder and a milling head releasably attached thereto. The milling head has a head through recess opening out to the head forward and rearward surfaces. The recess includes a plurality of radially extending tooth-receiving lobes. The tool holder has a projection which includes a plurality of radially extending teeth. When assembled the teeth are located in the tooth-receiving lobes and provide centering and torque transfer capabilities.
Claims38
A milling head (24) having a head central axis (B) that defines opposite forward and rearward directions (DF, DR) and about which the milling head (24) is rotatable in a rotational direction (R), the milling head (24) comprising:
- opposing head forward and rearward surfaces (26, 28) and a head peripheral surface (30) extending therebetween, the head peripheral surface (30) extending circumferentially about the head central axis (B);
- a plurality of angularly spaced apart peripherally disposed cutting portions (40);
- and
- a head through recess (44) extending along the head central axis (B) and opening out to the head forward and rearward surfaces (26,28), the head through recess (44) being delimited circumferentially by a recess peripheral surface (46) and comprising a plurality of angularly spaced apart tooth-receiving lobes (48) extending radially outwardly;
- wherein:
- the recess peripheral surface (46) comprises a plurality of driven surfaces (58) and a plurality of radial centering surfaces (62), all being located at the plurality of tooth-receiving lobes (48) and configured to abut corresponding surfaces on a tool holder (22), each driven surface (58) facing opposite the rotational direction (R) and each radial centering surface (62) facing radially inwardly;
- and
- the plurality of radial centering surfaces (62) are located radially outwards from the plurality of driven surfaces (58).
A tool holder (22), having a holder central axis (C) that defines opposite forward and rearward directions (DF, DR) and about which the tool holder (22) is rotatable in the rotational direction (R), the tool holder (22) comprising:
- a shank peripheral surface (72) which extends circumferentially about the holder central axis (C);
- a shank forward end surface (70) bounded by the shank peripheral surface (72) located at a forward end of the tool holder (22);
- and
- a shank projection (74) projecting from the shank forward end surface (70) along the holder central axis (C), the shank projection (74) being delimited circumferentially by a projection peripheral surface (76) and comprising a plurality of angularly spaced apart centering drive teeth (78) extending radially outwardly;
- wherein:
- the projection peripheral surface (76) comprises a plurality of driving surfaces (82) and a plurality of radial alignment surfaces (84), all being located at the plurality of centering drive teeth (78) and configured to abut corresponding surfaces on a milling head (24), each driving surface (82) facing the rotational direction (R) and each radial alignment surface (84) facing radially outwardly;
- and
- the plurality of radial alignment surfaces (84) are located radially outwards from the plurality of driving surfaces (82).
Dependencies are inferred from the claim text.