Note: Descriptions are shown in the official language in which they were submitted.
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~ CA 02548486 2006-06-O1
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P802S88/WO/1
Dai,n~erChrYsler AG
Forming tool
The invention relates to a forming die in aCCOx~aanao
with the preatttble of patent Cla3,m 1.
R foraging 8~.e of the gener~,a type ie known Prom
D1~ 1 Q 1 3 9 13 5 Al . In the C document , the f e~rt~.ug die ha,s
a vent lice which i.s foxcned as a passage, ruaa~ within a
8i.e block of the foxmiug die and connects the shaping
to ~rpaaa fox~cned by the die cavity to the area surroundfac~
the die. Dur~.ng the ~3haQing of the workpieoe, the nix
which ~.s present in the a?aaping ~apaae ~.s dieplaved out
of the form~.ug die by the detation of the workpieco.
If a workp~.ecse, in thin case in the form of a hollvar
profiled section, is then i.naerted into xhe shaping
space of the fonni.ag die and p3.acod under pxesaura, the
warkpiece tc~lds 3t~telf to accurately matcah the cavity
of the shaping space . Since Che~ vent l~.~pe opens out at
the cavity, the opening where ~.t opens out dorms au
extsemeiy undesirable mark on the s~oxlSpiece an account
of the high ooateect prees~ure with which the workp~.ece
is preened onto the -eav~ay to achieve the required
eontovur accuracy. The vpe~ing of the line may coca be
s0 large thafi the workpiece is proceed i~ato the Li~ao,
where ~,t is urides~.rably stamped out, which ~.u=vitablyr
Leads to the part, be~.ng scrapped.
~k~e ~.nvez~tian i s based on the ob j act of further
developing a fvx~ming die of the generic type a.sz such a ~
3 o war thaC contours wh3.Gh axe uriaf f acted by the
arrangement of passages eonnectix~g the shaping space to
the area guxroundiag the die are ach~.eved i.a a simple
way during the ehapiiag of the workpiece.
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Aceord3,ng to the invention, th~.s obj act ~.a achieved by
the featuteg of gatent claim 1.
7~1a a result of a liquid-petmeetble and gas-pe~de~ble
insert body being ax'ranged in the fotliling die, a
~xripheral region of which forces a pox~t~.on of the
cavity, alsd on account of the fluidic ooaneetion of the
paosage to this inert body, the op~aing where the
passage opens out is vovered, with the result that no
ianprint of this opening i,s fox~ned on the workplace ~ah~n
3.t is bG~.xig pressed onto the cavity by tbs forming
process, ire parCtculax in the. calibxation phase.
Therefore, the ct~ntours of the v~orkpiece remain
uaafteoted during shaping. Si~ace the insert body !.s
2~ pexmeable to liquid and gas, thB Euaction of the
passage, namely that of discharging and ii! ap?2~rixte
else supplying lic~,uid or a gam, for example ai.r. ins
Completely r~taiued. An insert body of this type is
sidle to produce and can readily be installed in the
die after the recess intend~d for it ha~3 been fo~id.
when a certain state of wear has been reached, the
insert body can be exahatzged with little diffiaul.ty
u~ir~.g suitable securing mesas , Moreover, the ~,nv~tiou
obviates the prob7.em of predeter~uj.ning the eorxect
Z~ position for forming the passage, since the insert body
means that the raedia which axe to be disehargdd fin
the cavity are captured over a certait~ area rather than
iu punatfform fashion and can pass through the insert
body vi~'tually unimpeded until they reach th.e open~,rag
of the passage, wh3.ah s that accurate pos~.t~.on3ng
of the passage is no loagcr r~ecassary; the passage carp
noW open out at any desired position of the 3,usext
body,
tri a part~.cutarly preferred reEinemeat of the iaventiox~
as described in claim 2, the iz~aGrt body coasiats of a
porous ainta~red metal. This iz~ particular ensures that
the iz~sart body is able to withstand, the contact
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pressures re~tu7.t3,ng from the deformation without berg
damaged. The pvros~ity is effected by sim~pls pores and
' u~icropast~agem through which liquids and gastea can
penetrate.
zn a further preferred configuration og the invention
according to claim 3, the ~.nsezt body is an ultrafius
:sieve or a diaphragm. If sin ultrafine sieve ig used, it
should be eneu~ed that the mesh is deeigncd to b1 as
3.0 rigid and du~rab~.G as possible and the mesh size ~.a kept
as sma..ll as posasib~.e, so that on the oue hand the
contact preea~uxea can be absorbed and ou the othex baud
ari it~pxirit of the meshes on the v~~rkp~.ece is prevented.
Tf s diaphragm is selected, the diaphrsgcg shauld
~.ikewiee be designed to be rigid iri order in this wsy
to Cope with the contact pressures. of eourge, the
diaphragm must be des~.gaed in such a Way ae to be
permeab~.e to liguids and ga,se~s. In addit~.ou to casiplete
permeability in this respect, ee~tipera~eabili.ty of the
diaphragm is also eoncefvable. Ultrafine si~wes and
dietph7~agmS are 3,nexpeusive, very s~.mple to produce and
particular7.y simple to apply to the die. Ire thi.s case,
it ~,a also possible for existing foratixlg dies to be
retxofi.tted with an i.~xsext body of this types with only
~ 5 a very Small am4unt of ef fort .
sn a further particularly preferred configuration of
the form~.ng din according to the iaventiat. as described
in claim 4, tl~e form~.ng die is a hydroforming die, in
which case the workpieee is foamed by a peripher$lly
continuous hollow pxofi~.ed section. zf the terming die
ie used as a hydrogoxming die. -th.e coaf~.guration of the
form:fng die in accordance with the invention is highly
advantageous, since it is known that is the
hydrotorm3.ng process extremely h~.gh pressuxeS are
exexted on the ho7,lowr prof3,J.ed section, vrthich likewise
lea4s to immense contact pressures of Ghe hollow
profiled section aga~.nst the die cavity. Sinv~ as a
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result the shape of the cavity is highly accurately
rtpxnduced or: the hollow pmf,iled section, the yvay in
' wl'~iah the i.nvex~tf on prevents imp=ints of the opeuiagg
of passages cor~neated to the shaping space is highly
ittportant . Ass a result, the outer Comtour of the hollow
profiled aectiau, which is of toieranoe~fxee and highly
accurate configuration as a result of the hydxoformiag
process, im retai~aed without it being necessary to
dispense with the supply or xemowal of liquids or gs,Aes
from the shaping s~pave or into the shaping space.
Ttie invention is explained in more detail below on the
basis of an exet~lary embod3meat illustrated in the
araw~.ng, is which the figure, is the toxin of a latex~l
lougitud~.na1 section, shows a forming die according to
the invention with ~,naest bodies arranged att the
shaping apace.
xhe figure illustrates a hydroforming die formed ag
forming d~.e ~,, whioh has a cavity 3 fortn~i,~ a shaping
space, into which a vrorkpiece (in this case a hollow
prof~.led sectiot~f is introduced. The forming die. i taaay~
also be a deep-drawing die. A plurality of pas~sagas 4,
5, 6 arid ~, which eosZnect the shaping space 2 to the
area surs~ouading the die, hazre beerz Imachinad into the
forming die, Ths pa~aeagea a to ~ are used to supply
easd/or discharge lubrivaat to the hollo~o profiled
section whi.ah has beau introduced into the foxmi~ag d~.e
I, in order to xeduCa the friction between. the hollow
progiled sect~.ot~ and the cavity 3 during the forming
pxocesa. The passages ~ to ~ can a~.eo be used to
d~.scharge air aszd pressure- medium. which otherw~.se, on
account of being enclosed ~.n the shaping space 2, would
hugely impede the forming process. Air and pressurized
fluid in the shaping space 2 or~,g~.r~,ate oa the one hatzd
from the voXume of air which has not been ex$elXed
during closure of the forming die 1 and oa the other
hand, with regard to the pressurized f7,uid, ,from tw4
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pressuxized fluid gxaCtions, namely the preSsuriaed
flui4 which flows out after removal of a fully shaped
hollow profiled section from the formi~ag die 1 sad the
pressurized fluid which undesirably enters the gap
S between hvllo~r profiled section axed cavity 3, peBSing
~.atc the shaping apace 2, during tilling of tha hol~.ow
profiled section.
A plurality of liquid-permeable and gas-pezmeable
1,0 insert boc9iss 8 are integrated ixi tht ioraaing die l and
are each acaodated J.n a x~cess 9 in the die 1 sear
to the ghapiug spare. Although the inse~.-t bodies 8 in
this case aonarist of a poroum elu,tQred atetal, it ip
also possible for them to be foamed by an ultriviirie
~5 sieve er a diaphragm. The peripk~ex~al regioxi to of the
insert bodies 8 whioh faces the Shaping spao~ 2 3t~self
in. sash cage foams a portion ef the oa~r~.ty 3, ~w~th the
resu~.t that there are no discout~.nuit3eg is the pxofile
of the cavity 3. The passages 4 to 7 which xvtl tpithin
20 Che tormirig die s opan Out at a reax fide 7.1 of tha
respective inaext body 8 outside sa~.d peripheral, region
10. Qty aecourit og the porosity of the iixsert body 8,
the air or pressurized fluid Gan penetrate through the
pores and/qr micrope~sgages of the insert body 8 l,nto
z5 the passages 4 to 7, from whf.eh they are di.aeharged
from tte fortnirtg die either thxcugh the force of
gravity or by taeans of e~ suitable punk. Therefore, a3x
axxd pressux~.~ed f~.u3;d can eaSi~.y be di~sp~.aced by the
workplace, Which is moving eves vloeer to they cav~.ty 3,
30 out of the $hap~.ng space 2 isZto the passages ~ to 7 via
the lnsext bodiefs 8, without x~n impxiat of the ogeni,ag
of the passages 4 to 7 being fortaed after the wo_rkpiece
camas into contact ~rith the ca~ri.t~r 3.
35 Furthermore, it is also aonceivahXe to use an insert
body 8 which includes relatively large parts of the die
aaviCy 3 az~d in this case comprit~es a plurality of
regions o~ the Cavity 3 which are prone to iaaluaions
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of media and therefore require dievhatrge of air and
pressurised fluid. rt is is~ th~.s case suffidi~nt for
only a single passage to be conneotad to this elongntc
invert body s. since on account of the displacempat
pressure originating from the workpi.ece which i.s being
shaped, the air a~ld the pressuri2ed fluid can e~lso
penetrate through lateral, oblique and/or labyriath-
like micropassages and pores in the ~.nsert body 8 in
order to enter the passage 4, s, 6 or 7. As ~ a resu~.t,
there is rio rieeci for aadura0.te positioning of Che
passage 4, 5, 6 or 7, which leads to considexabl.e
simpligication of the design of the die s, end tkte
production of the passage can be automated during
manufacture of the die ~. , It is in this case pos~sib~.e
to select a loaatior~ wh~.eh is the t~tost appropriate both
for the disahaxge of the media and for the desig~a of
the die.
Furthermore, it is cozwei.vable for the hydroforcn3.ng die
1 to be ccniigu~red for the widening o! plates, in which
case the workpiece is formed by two prat~s on tap of
one another, which are vlataped ia~ the forming die 1.
between its upper and lower d~.e blocks. A tZuidia
3ntErnal high pressure is gcneratea between the p~.ate~e
by means of a lance-like ~alunger which ig assigned to
the fortnix~g die 1, has at least one axial. pres$uri~aed
f~.uid pafssage inside it and is inaexted between the
plates, with the result that these plates are expanded
to form a hollow profiled section.
