RMP Templete PPT
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Transcript of RMP Templete PPT
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Rapid Manufacturing Processes 1
FUSED DEPOSITION
MODELLING PRINCIPLE
SNDEEP R!
1"#"1#
MNUFCTURING
ENGG$
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INTRODUCTION
Fused deposition &ode'ing (FDM) is an additi*e
&anufacturing tec+no'og, co&&on', used for &ode'ing-protot,ping- and production app'ications$
FDM .or/s on an 0additi*e0 princip'e , 'a,ing do.n
&ateria' in 'a,ers2 a p'astic fi'a&ent or &eta' .ire isun.ound fro& a coi' and supp'ies &ateria' to produce a part$
T+e tec+no'og, .as de*e'oped , S$ Scott Cru&p in t+e 'ate
1345s and .as co&&ercia'i6ed in 1335$
T+e ter& fused deposition &ode'ing and its are*iation to
FDM are trade&ar/ed , Stratas,s Inc$
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Rapid Manufacturing Processes #
PROCESS Main part of a FDM is a &o*a'e (78,) no66'e$
Mo'ten po',&eric &ateria' co&es t+roug+ t+is no66'e
.+ic+ gets deposited on t+e sustrate$
9or/+ead is contro''ed in t+e x-y p'ane during eac+
'a,er$
:ui'd &ateria' is +eated s'ig+t', ao*e its &e'ting
point so it can so'idifies easi',$
One 'a,er .i'' co'd .e'ds to pre*ious 'a,er$
Part is faricated fro& t+e ase up- using a 'a,er8,8
'a,er procedure$
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Rapid Manufacturing Processes ;
:SIC PRINCIPLES
Loading and 'i
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MTERIL LODING
T+e FDMs can e e
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LI>UIFICTION
?eat is app'ied , +eater coi's .rapped around t+ec+a&er and t+is +eat is app'ied to &aintain a constant
te&perature in t+e &e't$
T+e ui'd &ateria' is +eated s'ig+t', ao*e
(appro7i&ate', 5$" C) its &e'ting te&perature$ It is done so t+at it so'idifies .it+in a *er, s+ort ti&e
(appro7i&ate', 5$1 s) after e7trusion and co'd8.e'ds to
t+e pre*ious 'a,er$
T+e fi'a&ents are +eated into a se&i8'i
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EATRUSION Materia' f'o. t+roug+ t+e no66'e is contro''ed , t+e
pressure drop et.een t+e c+a&er and t+e surrounding
at&osp+ere$
rc+i&edean scre. e7truder is used to descrie t+e
e7trusion &ec+anis&$
T+e *o'u&etric f'o. caused , t+e scre. in t+e no66'e-
/no.n as drag f'o. >D
T+e *o'u&etric f'o. due to pressure f'o. in t+e c+anne' is
>p$
In order for &ateria' to e7trude fro& t+e output no66'e-
t+e pressure f'o. >P&ust e7ceed t+e drag f'o. >Dto
gi*e a tota' f'o.$
.
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SOLIDIFICTION
Once t+e &ateria' is e7truded- it s+ou'd idea'', re&aint+e sa&e s+ape and si6e$
Gra*it, and surface tension &a, cause t+e &ateria' to
c+ange s+ape$
T+e &ateria' &a, s+rin/ upon dr,ing and coo'ing- as.e'' as possi', eco&ing porous$
T+is can e &ini&i6ed , ensuring t+e te&perature
differentia' et.een t+e c+a&er and t+e surrounding
at&osp+ere is /ept to a &ini&u&$ T+is can e done , use of a contro''ed en*iron&enta'
c+a&er .+en ui'ding t+e part$
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POSITIONL CONTROL
P'otting &ust e coordinated .it+ t+e e7trusion rate toensure s&oot+ and consistent deposition$
n, c+ange in direction resu't in a dece'eration
fo''o.ed , acce'eration$
T+e corresponding &ateria' f'o. rate &ust &atc+ t+isc+ange in speed -ot+er.ise- too &uc+ or too 'itt'e
&ateria' .i'' e deposited in a particu'ar region$
9+i'e c+eaper s,ste&s often &a/e use of e'ts dri*en
, stepper &otors- +ig+er cost s,ste&s t,pica'', use
ser*o dri*es .it+ 'eadscre. tec+no'og,$
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:ONDING
For +eat8ased s,ste&s t+ere &ust e sufficientresidua' +eat energ, to acti*ate t+e surfaces of t+e
adBacent regions- causing onding$
If t+ere is insufficient energ,- t+e regions &a, ad+ere-
ut t+ere .ou'd e a distinct oundar, et.een ne.and pre*ious', deposited &ateria'$
T+is can represent a fracture surface .+ere t+e
&ateria's can e easi', separated$
Too &uc+ energ, &a, cause t+e pre*ious', deposited
&ateria' to f'o.- .+ic+ in turn &a, resu't in a poor',
defined part$
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SUPPORT MTERIL More recent FDM s,ste&s inc'ude t.o no66'es- one for
part &ateria' and ot+er for support &ateria'$
In FDM- a supporting structure is re
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Fused deposition
modelling
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FDM 3000
by Stratasys
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COMPRISION 9IT? OT?ER PROCESSES
SL and Po',!et use p+otopo',&ers t+at can e sensiti*eto &oisture$ FDM protot,pes are unaffected , &oisture$
T+e, retain t+eir origina' &ec+anica' properties and
di&ensiona' accurac,$
For co&&on tip si6es and ui'd para&eters- t+e
&ini&u& feature si6e ranges fro& 5$51= to 5$5%; in
.+ic+ is 'arger t+an t+at of SL and Po',!et$
FDM offers a .ide range of ui'd en*e'opes$ Ma7u&-
t+e iggest- offers parts si6es up to %#$= 7 13$@ 7 %#$=
inc+es$ Prodig, P'us- t+e s&a''est- +as an en*e'ope of 4 7
4 7 1% inc+es$
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DNTGES
?ig+ strengt+
It is cost8effecti*e
9aterproof
It can use :S(cr,'onitri'e utadiene st,rene).+ic+ is a co&&on t+er&op'astic po',&er$ Its g'ass
transition te&perature is appro7i&ate', 15" C (%%1
F)) &ateria' for its i&pact resistance and toug+ness-
and &u'tip'e &ateria' co'ors are a*ai'a'e
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DISDNTGES
ccurac, is re'ati*e', 'o. and is difficu't to ui'dparts .it+ co&p'icated detai's$
Poor strengt+ in *ertica' direction$
S'o. for ui'ding a &ass part$
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