Cutters – for shaping – Including holder having seat for inserted tool – With separate means to fasten tool to holder
Patent
1998-03-27
1999-12-21
Howell, Daniel W.
Cutters, for shaping
Including holder having seat for inserted tool
With separate means to fasten tool to holder
407101, 407102, B23B 2716
Patent
active
060040815
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a tool for cutting metal machining according to the preamble of claim 1. More specifically, the invention relates to a tool that makes possible a fastening of indexable cutting inserts with different numbers of cutting edges in one and the same insert seat.
The use of detachable, indexable cutting inserts is nowadays common practice for generally all cutting metal machining, i.e. for turning, milling, boring, etc. They are usually made of coated or uncoated cemented carbide, but some ceramic materials also occur. These different indexable cutting inserts may have very varying geometrical basic shapes, depending upon cutting economy and applications. They may e.g. be triangular, rhombic, square, rectangular, round, hexagonal and octagonal. Further, they may be double-sided or single-sided, depending on if cutting edges are present on both sides or only one side.
Common for all possible different insert shapes is that they require an insert seat in the holder per se adapted to the shape of the insert. Thus, square inserts normally require an insert seat with two mutually perpendicular support or bearing surfaces in the insert seat, a round insert requires a round support surface, or at least segments of such a surface, an insert with the shape of a regular hexagon necessitates two support surfaces that are angled by 120.degree. to each other (or two surfaces at a distance that are angled by 60.degree. to each other), etc. This means that a change of insert shape also requires a change of holders. This is time-consuming and, primarily, expensive.
The advantage with, e.g., a hexagonal insert in comparison with a square one, is of course that the hexagonal one has more cutting edges, more precisely for a single-sided insert, two more. Naturally, this involves a better cutting economy, since by one and the same insert, one in principle may extend the working time by 50%. However, some disadvantages with hexagonal cutting inserts is that they do not make possible the same cutting depth as for instance square inserts do (i.e., inserts with the same extension from the middle point to the operative cutting corner), and that they do not make possible 90.degree. milling or turning. Therefore, it is desirable or necessary to sometimes replace for instance square cutting inserts, whereby also the holder has to be replaced, as mentioned above.
For instance, in U.S. Pat. No. 4,966,500 holders are disclosed for different basic shapes of cutting inserts, such as square, hexagonal and octagonal. It may easily be understood that square and octagonal inserts could be fitted into the same insert seats, since both these have cutting edges located perpendicularly to each other. However, hexagonal inserts require their own holders, which may be seen in that citation.
Thus, a first object of the present invention is to improve the cutting economy by optimizing the number of cutting edges in one and the same holder.
A second object of the present invention is to provide an insert seat that may accommodate both square and hexagonal inserts.
Another object of the present invention is to provide a hexagonal insert that may fit in an insert seat for square inserts.
These and further objects have been achieved in a way that is surprising for the skilled man, by constructing a cutting insert seat and a cutting insert, respectively, with the features as defined in the claims 1 and 5.
For illustrative but non-limiting purposes, some preferred embodiments of the invention will now be further described with reference to the appended drawings.
FIG. 1 shows an exploded view of an insert seat according to the invention, in a perspective obliquely from above.
FIG. 2 shows an exploded view of a somewhat modified insert seat according to the invention, in perspective obliquely from above.
FIG. 3 shows the same insert seat as FIG. 1, but with a hexagonal insert instead of a square one.
FIG. 4 shows the corresponding insert and insert seat as FIG. 3, however without a shim.
FIG. 5 shows the bottom side of a hexagonal
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Hellstrom Lars
Kemper Erwin
Pantzar Goran
Roman Stefan
Scherbarth Stefan
Howell Daniel W.
Sandvik AB
Williams Mark
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