Note: Descriptions are shown in the official language in which they were submitted.
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1
Dliethod aad tool holder for tura3.ng inner contours
on workpieces
The invention relates to a method and a tool holder for
turning inner contours on workpieces.
~t'ool turrets which are zitLed with tools belong to the
prior art. Thc3c tools h3vc in each ca~c been developed
for a predetermined machining operation, so that, for
each machining operation on a "pccific worJcpiccc con-
tour, a tool specially matched thereto and having a
tool holder had to be u~cd hitherto. For thi3 purpo3e,
the machine tool must be traversed to a reference posi-
tion which lies outside the region of colliEion with
Lhe workpiece during the tool change. 1n the process,
the tool turret is aligned with the desirod tool, so
l.tidt the latter eats SubS~c~uently be brought into en-
gagement for the machining.
The obj ect of tha invention is to provide a method and
n W ~l holder t~~~ turmity ,liuier contours on workpiece5,
in which the time for approaching the reference posi-
tior~ Lur Ltie tuul change amci rur dppt~oacriinq the work-
piece in and from this same referenc~ position is not
re~uir~ci, 5~ LI~aL mauluimiy vpez~ations can be carried
t pffir_.iently with ~hc,rt cycle times during which a
plurality of tools have i;o COme into e1-~ydgen1e11t in ac
cort~iannP wi i:h the manhi ni ng sPdtlencQ
Thi g nhjp~t i s arhi PV'Pt'j arrnrrling to the invention with
a method having the features of claim 1 and a tool
holder having the xeatures os patent claim a.. The g»h-
claim3 related thereto advantageously develop the tool
holder as claimed in patent claim 2.
i5
The Luul holder dc;c:uwdiiy to the invention permits the
asp of a plurality of different tools for various ma-
chining tasks . In this way, the tcrUl c;lid~i~e, Lor exam-
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WO 00/35618 PCT/EP99/09788
ple inside a central bore of a workpieoe, ~dkes place
wit-.hnut the machine tool having to assume a reference
position fvr the purpose of a Luul caldrlc~~. The down
r.imPS for moving the tools into the tool-change clear
ante position, for example Ly inrl~xiuy 1.11e l.oul turret,
and for approachi ng the work~,i Pce with thr~ other tool
are thus not required. As a results ~.11-l.' iLld(,;111111r1CJ ~:1II1~5
per workpiPCP are substani:ially rprlucPd. The machining
itaclf is effected more quickly and mo~:e cost
ettectivPly.
The to~1 h~1 dPr aaa~rdi.ng rn thp invention for turning
inoide contour3 on workpieces is explained in mete de-
tail with reference to the drawings arr,~rdi ng t-.n fi gs
to 3 .
Fig, 1 Shows a Schematic view of the tool holder with
chuck and tool turret.
Fig. 2 shows a section A-A through the mounted w~rk-
piece in a front view of the tool holder
equipped with tools.
Fig . 3 Slows a plait view of a tool holder according to
the invention.
Fig. 4 shows an enlarged detail (detail x) of the tool
I;lUlt~~t' ctC:C:Vt'G11r1Ca LU fig. 3.
A workpiece 3 to be machined is sl~uwm iti Lids 1 and Z,
this wnrkpipra ~ hping machined at the inner contour.
In thi3 ca3e, different tools are used fuz elm 5djoe
workpiece ~. l~he workpiPOP .3 t~ he machined is mounted
in a chuck 1 with attached chuck j aws 2 . Tlic ~liu~k 7, is
Ldstened to a work spindle (not shown), which is accom_
modated in a headEtock. The axis of rotation of the
wozk spindle is in alignment With the longitudinal axis
of thp nhurk 1 and the longitudinal axiE of the work
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- 3
p.~ec~ 3. the work spindle is motor-driven and transmits
the rotary movement to the chuck 1_a9 shown by arrow 4.
The inner contours 3h, 3B and 3C, for example, are to
k~e produced on the workpiece 3 by machining. For pxam-
rle, an intArnal turning tool is required fox machining
Lt~e contour 3A, a facing tool is required for machining
the contour 3C, and a recessing tool i;, required for
maoluimicic~ l.~i~ c;~W~ur 38.
lU
These Lc,mls tld.ve c,iirre~eul. yeometriCal forms adapted to
the machining requirements and are uaed one after an-
other iii a sequeilcc F'rL~d~Letw.~jled by the CNC program by
appropriate turning of the holder 5.
A~~nrdin? to firl. 1, the tool holder 5 has a circular
end face ~' ~.n which a plurality ut diLlerent cutting
i-nols provided with different cutting geometxy are ar-
ranged. For example, the cutting L~~l~ 6, 7 dnd 8 of
different cr~nfiguratinn are used by radial indexing of
the tool holder 5 about its longituairial axis . The ra-
dial indexing to the different cui-.iri nc~ tn~l.s H, 7 and 6
i3 indicated by arrow 9. The tool hul~lez ~ is d~uvuuuo-
dated in a tool-holder plate 11 of a turret head 10 of
a machine tool, such as, for example, a laLW . The Lut~-
ret head 10 is rastened to a g»i cep ho»sinrl (not shown)
which is mounted on a guide System which is traversable
in Lhe two aXes X and G, preferably at ri c~ht- anr~J_es to
one another, by means of the CNC axe3.
~0
A plurality of tool holders 5 having different cutting
tool, 6 Lor ditrerent production programs are attached
to the periphery of the tool-holder plate 11. =n the
exemplary eic~uciimeciL stmwn, the inner Contour 3!1 of the
bore of thp w~rkpip~p 3, f~r_ example, is machined with
the cutting tool 6. The flat face 3C, for example, is
then machined with the cutti.nc7 tnnl 7. For this pur-
Pose, the tool 6 is moved into a clearance posit~Lon in
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~:he X-axis direction. The cutting tool 7, by irideXlrig
the Lool holder 5, is Lhen brought into the po3ition
'Fnr the recessing 3B and after that i, moved into a
clearance Yu5lLion again, anti the cutting tool 9 is
brought into use by appropriate ii~dCxiriq by means of
the tu~~ret head 10.
A fru~lL view of the tool holder 5 is shown in fig, 2,
~ n which, for e~.ample, the cutting tool 6 uLl Lye tool
hol~lc~ 5 is in the machining pos i t-. i nn , The holder 5
shows, for example, the number of tools 6, 7 aW 8,
which is dot~rrnime~i by the workpi a~a geometry to be
pr~W.iced_ Care is to be taken when tooling the l~old~r 5
that adjace«L c:uC.Linq tools do not co I I i ~3p during the
mat-.pining of thA workpieee inner contour (cf. t~,c~, 2,
item 20),
Shown in fig. 3 is a LuuZ holder 5 which is preferably
prOVlded with screw-in or push-in inserto 30. The cut-
ting tools 6, 7, 8, eLc;., axe each inseri:Pd by the
shank i ni-~ 'I-~'1P~P insr~rts 30 . The inacrt3 30 are ar-
ranged close to the outer pet'~,phery oP the tool holder
5, According to fig_ 3, cutting tips, a3 tools, are
faetcned with clamping scrcw~ L~ the insert 30, which
is secured r_o r.hP t.~n I holder 5 by means of a Screw 31 .
. In the peripheral region, the tool lwlder has V-grooves
32 into which the cylindrical inserts or carriers 30
can be clamped (see fig. 4) , Irl l.liis case, the tool
ud.criexs, on account of their cylindrical shape, arc
3« simple to produce and can also Le ~~'odu~~d cost-
efrec:tively in series.
In a further emLuc~iwent of Lhe i nvpntion, the tool
holder 5 may bye fitted with a plurality of identivcl
3$ different cutting tools, Lug with at least two ratting
tools.
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The.numbor of cutting tools depends oil Che geometry of
the workpiece 3 tc hP produced and may con3cquently
vary, 3o that a specific tool gel. may be attached to a
tool holder 5 whit-.h can he assigned to the workpiece. A
plurality of tool holders ~ wlzic;>~i are tooled in a dif-
ferent manner permit rapid mac-.hining of different work
piece gcomctrie3 with e~.tremely 'l~crL re-setting times.
Completely tooled Lool ho.lhAr~ 5 permit repeated u,,c
without additional adju3ting work.
