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FETHER,STON r..A I~ np2/012 WO 00/35618 PCT/EP99/0970~
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-29!05 ' 01 12 ~ 5d FAX +d9 89 92805ddd cA o2s52as2 2ooi-o5-2s ; ~TNICH ~
FETHERSTON GA IQ Op3l012 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 29/05 'ni 12:5d FAg +d9 89 92s45ddd CA 02352892 2001-05-29; ~NIr..H ~
FETHERSTON GA IQ40d/012 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 23!05 ' O1 12 ~ 55 FAR +d9 89 92805ddd CA 02352892 2001-05-29 ; ~~Irg ~
FETHERSTON rA IQ pp5lp12 wo 00/35018 pcT/Erp~/p9788 ~: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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FETgERSTON rA y'44B/4i2 WU UU/35H'I >3 PCT/EF99/09700 - 5 _ 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.