Cutters – for shaping – Rotary cutting tool – Including holder having seat for inserted tool
Patent
1996-06-10
1998-03-17
Pitts, A. L.
Cutters, for shaping
Rotary cutting tool
Including holder having seat for inserted tool
407113, 407114, B23P 1528
Patent
active
057279101
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a milling and drilling tool for producing openings such as fits, blind holes, or threaded holes having any diameter within predetermined range in a solid material, with the milling and drilling tool being rotatably guided and axially displaced along a circular path about an axis of an opening by, e.g., by a CNC-controlled machine-tool, and being provided with face cutting edges, which are arranged on a cutting insert for forming a cored opening, with the face cutting edges having an inwardly directed V-shaped cutting edge geometry, and with inner and outer flank cutting edges and radius-formed cutting edge transition.
2. Background of the Invention
German publications Nos. 3,909,077 and 3,831,046 disclose milling cutters of the above-mentioned type for forming bores, fits, recesses, threads in solid material when used in CNC machine tools or the like. In order to form a cored recess or bore with a single cutting unit, cutting inserts having outer and inner flank cutting edges and two radius-shaped face cutting edges are used. With this cutting edge geometry forming of fits in solid material became possible due to the reduction in axial resistance, and this cutting geometry substantially increased the operating life of the face cutting edges because the latter continuously come out of the cutting engagement due to the circular nature of the milling process. Both systems have certain drawbacks as during forming of fits so during forming of a thread. A substantial drawback of the reversible cutting insert of the German publication No. 3,909,077 consists in that two plates are used to form a milling cutter having the above-described cutting edge geometry, whereby the number of cutting edges, which can be used, is substantially limited because only a limited number of cutting inserts can be mounted on a milling cutter shank. In addition, securing of a milling cutter shank is difficult and, thereby, is naturally very expensive. The problem associated with cutting inserts of the German publication No. 3,831,046 consists in that, because of the manner of their mounting they cannot be formed as reversible inserts, and besides, their mounting is technically complicated and, therefore, expensive. In addition, during the milling process, the inserts have a tendency to become loose. A further problem with conventionally used reversible cutting inserts consists in that the flank edges should have a substantial length in order to insure, on one hand, an adequate stability and on the other hand, their appropriate mounting on the milling cutter shank. This drawback adversely affects the intended use of the insert, in particular, when the insert is used for forming fits in the solid material, because the flank cutting edges should be arranged on the milling cutter shank at a precise angle relative to the cutter axis, almost with a hundred percent precision, to insure cutting of a corresponding fit, otherwise the cut bore would have a larger dimension in the upper region than in the lower region or at the cutter base. Also, thereby the reversible cutting edges would unnecessary premature partially wear off. Thereby, it was determined in practice that with such a tool, because of the required length of the flank cutting edges, the necessary fit dimensions cannot be obtained. A further problem consists in that the cutting area of the reversible insert, which provides for rough machining, does not have an ideal cutting edge geometry, and this is associated with increased energy and power requirements which the machine tool must meet, and in addition, the service life of the cutter insert is decreased.
A further problem consists in the need to adjust each cutting edge separately circumferentially and angularly in the micron region because, as the practice has shown, without the possibility of a such circumferential adjustment, forming of a fit with a tool, which is equipped with a plurality of reversible cutting inserts, in a contemplated milling pro
REFERENCES:
patent: 4572042 (1986-02-01), Wilman
patent: 5145295 (1992-09-01), Satran
patent: 5232319 (1993-08-01), Satran
patent: 5593255 (1997-01-01), Satran
Pitts A. L.
Williams Mark
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