Cutters – for shaping – Including holder having seat for inserted tool – Tool adjustable relative to holder
Reexamination Certificate
2002-01-30
2004-08-03
Wellington, A. L. (Department: 3722)
Cutters, for shaping
Including holder having seat for inserted tool
Tool adjustable relative to holder
C407S104000
Reexamination Certificate
active
06769843
ABSTRACT:
This application claims priority under 35 U.S.C. §§119 and/or 365 to Patent Application Serial No. 0100252-6 filed in Sweden on Jan. 30, 2001, the entire content of which is hereby incorporated by reference.
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a tool holder for cutting inserts for chip removing machining, the tool holder comprising a head, as well as a seat having side surfaces which engage side edges of the clamped-in cutting insert. One of the side surfaces of the seat is flexible.
PRIOR ART
In a leaflet from ISCAR, entitled “ISCAR's New Clamping System for Profiling Tools” conventional prior art is shown, which is illustrated herein in
FIGS. 10 and 11
, as well as a further development of prior art, which is illustrated in
FIG. 12
herein.
As is seen in
FIGS. 10 and 11
, in the conventional prior art there is disclosed a three-point abutment. In case the cutting insert S is exposed to a force Fc
1
acting from the right, see
FIG. 10
, the cutting insert S will abut at two points CP
1
and CP
2
against the stiffer side surface
100
of a holder
102
and at one point CP
3
against a more resilient side surface
104
. This is illustrated in
FIG. 10
by an angle &dgr;
1
formed between the cutting insert S and the more resilient side surface.
If the force Fc
2
acting on the cutting insert S comes from the left, see
FIG. 11
, the cutting insert S will abut against the stiffer side surface at one point CP
1
and at two points CP
3
and CP
4
against the more resilient side surface. This is illustrated in
FIG. 11
by an angle &dgr;2 formed between the cutting insert S and the stiffer side surface.
Clamping of the cutting insert S is normally effected with a so-called rocking pin
106
, possibly in combination with a top clamp. This has turned out to be insufficient in a number of applications, i.e., the position of the cutting insert is not anchored in the holder to a sufficiently high degree of accuracy. This is particularly valid for this elongated type of cutting insert where large movements of the insert occurs if the insert is exposed to varying loads from differing directions, which is the case in, for instance, copy turning.
As can be seen in the prior art illustrated in
FIG. 12
, the insert seat is provided with a self-adjusting wedge W which abuts against a side surface of the cutting insert, the wedge being movable and self-adjusting to the cutting insert so that a four-point abutment CP
1
, CP
2
, CP
3
, CP
4
is obtained. Since the self-adjusting wedge is movable, the fixation of the cutting insert in the insert seat will also in this case be inadequate for certain applications.
A turning tool having a replaceable indexable insert is previously known from DE 37 14 055. In certain of the embodiments, see
FIGS. 4
,
4
a
and
5
, of a timing tool according to DE 37 14 055, a flat wedge abutting against the indexable insert is provided with opposite slots, the open ends of which break through the longitudinal side edges of the flat wedge. The flat wedge abuts against the indexable insert with two contact points. A disadvantage of this known turning tool is that if the side surface of the insert seat that is integrated with the proper turning tool is damaged or becomes worn out, the entire turning tool has to be replaced, which is disadvantageous from the point of view of cost. As for the forces being transferred from the indexable insert to the two contact points of the flat wedge, said forces will pass past the open ends of the slots, which means that the slots are compressed in the area of the open ends thereof. Thus, the flat wedge will give way and thereby not give any active support to the cutting insert when the same tries to turn because of the external forces affecting the insert tip.
AIMS AND FEATURES OF THE INVENTION
A primary aim of the present invention is to provide a tool holder of the above-mentioned kind, where an exceptionally accurate clamping of the cutting insert in the insert seat is obtained, this notwithstanding that the cutting insert is exposed to varying sizes and/or directions of loading during, for instance, copy turning. The consequence of this is increased dimensional precision through the use of the tool holder.
Yet another aim of the present invention is that the cutting insert is to be anchored in the insert seat by means of a so-called four-point abutment.
Another aim of the present invention is that the insert seat should align automatically to the cutting insert when the same is anchored in the appurtenant insert seat thereof.
SUMMARY OF THE INVENTION
The present invention relates to a tool holder for holding a cutting insert for chip removing machining. The holder comprises a head and a support surface disposed on the head and adapted to support a cutting insert. A plate-shaped member is removably secured on the head and includes two fingers forming respective side surfaces disposed on respective sides of the support surface. The side surfaces face one another and extend generally perpendicularly to the support surface. Each of the side surfaces includes a recess disposed intermediate opposite ends thereof, wherein each side surface defines spaced apart contact areas. One of the fingers includes a through-slot spaced from the respective side surface and extending generally therealong to render that support surface flexible.
Preferably, a passage extends between an intermediate portion of the flexible side surface and an intermediate portion of the through-slot.
Preferably, the plate-shaped member includes a first serrated surface seated on a second serrated surface of the head to define a serrated connection between the plate-shaped member and the head. The serrated connection is omitted at one of the fingers.
REFERENCES:
patent: 3623201 (1971-11-01), Gustafson
patent: 4035890 (1977-07-01), Eriksson et al.
patent: 4283163 (1981-08-01), Grafe et al.
patent: 4533283 (1985-08-01), Satran et al.
patent: 4714384 (1987-12-01), Lagerberg
patent: 6126366 (2000-10-01), Lundblad
patent: 6244789 (2001-06-01), Tsuda
patent: 6270294 (2001-08-01), Sjoo et al.
patent: 6481936 (2002-11-01), Hecht
patent: 2002/0131829 (2002-09-01), Persson et al.
patent: 25 44 877 (1976-04-01), None
patent: 37 14 055 (1987-11-01), None
patent: 3714055 (1987-11-01), None
Burns Doane Swecker & Mathis L.L.P.
Sandvik AB
Walsh Brian D.
Wellington A. L.
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