Cutters – for shaping – Rotary cutting tool – Face or end mill
Patent
1991-09-16
1993-06-29
Bishop, Steven C.
Cutters, for shaping
Rotary cutting tool
Face or end mill
76115, 144219, 408225, B23C 518
Patent
active
052228428
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a milling tool.
A milling tool is known having a shank to which a substantially flat first cutting-edge carrier having at least one cutting edge is fastened in a radially projecting, lobe-like manner. The cutting-edge carrier is intended to rotate about a crrier rotation axis located in its plane.
German Patent Specification 2,523,201 has already disclosed a two-piece spade drill. This spade drill consists of a cylindrical shank which is slit at the end face so that it roughly has the shape of a fork with two prongs. A flat, plane, carbide drill tip provided with two cutting edges is fastened in the slit. On account of this solution, it is possible to combine higher-grade cutting-edge material with inexpensive, lower-grade carrier material.
Like drills, end mills are also mainly suitable for absorbing axial forces. In this respect, drills and milling cutters are comparable with one another. For this reason, the abovementioned publication is also cited as prior art for the present invention.
A disadvantage of the known solution is the low strength, due to the shape, of the shank in the area of the forking. This disadvantage can be compensated for only to a limited extent even by the best joining techniques between the cutting-edge carrier and the shank. The consequences are unfavourable vibration behaviour, high wear caused by this at the cutting edges of the tool, rapid fatigue and fracture of the shank as well as inferior cutting or working quality.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved milling tool in which the above-mentioned disadvantages are at least partially cured or alleviated.
This object, and others which will be made more apparent hereinafter, are attained in a milling tool having a shank having a shank rotation axis and a flat first cutting-edge carrier having at least one cutting edge. The cutting-edge carrier is fastened to the shank in a radially projecting, lobe-like manner. The cutting-edge carrier is intended to rotate about a carrier rotation axis in its plane.
According to one form of the invention, the milling tool consists of a shank having a shank rotation axis and a substantially flat cutting-edge carrier having at least one cutting edge and at least two arched areas. The at least two arched areas are shaped and positioned to form a tubular socket in which the shank is held so that the cutting-edge carrier is attached to the shank in a radially projecting lobe-like manner and is rotatable about the shank rotation axis. The shank rotation axis is arranged in a plane of the substantially flat cutting-edge carrier.
In a preferred embodiment of this form of the invention two arched areas are arched in opposite directions from each other and are displaced from and parallel to the shank rotation axis to at least partially form the tubular socket.
According to another form of the invention, the milling tool consists of a shank having a shank rotation axis, a first cutting-edge carrier having at least one cutting edge and at least two arched areas and a second cutting-edge carrier having at least one cutting edge and at least two arched areas. The arched areas are shaped and positioned to form a tubular socket in which the shank is attached with both cutting-edge carriers radially projecting in a lob-like manner from the shank rotatable about the shank rotation axis.
In an advantageous modification of this other form of the invention, the at least two arched areas of the first cutting-edge carrier are spaced from each other axially, have surfaces normal to the shank rotation axis and arch in the same direction displaced from and parallel to the shank rotation axis and the at least two arched areas of the second cutting-edge carrier are spaced from each other axially, have surfaces normal to the shank rotation axis, arch in the same direction displaced from and parallel to the shank rotation axis so that the first and second cutting-edge carriers mutually overlap to form the tubular so
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patent: 1769433 (1930-07-01), Janson
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patent: 4541757 (1985-09-01), Reynolds et al.
patent: 4677886 (1987-07-01), Neu
Schweikert Karl
Weisser Helmut
Bishop Steven C.
Robert & Bosch GmbH
Striker Michael J.
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