Transcript
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P L A S T I C
I N J E C
T I O N
M O L D
I N G
T Y P E
O F
P L A S T
I C I N
J E C T I
O N
M O L D
I N G
& I T S
C Y C
L E
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DIFFERENT TYPES OF
INJECTION MOLDING• Co-injection(sandic!"#o$din%
• F&si'$e($ost so$&'$e"co)e injection#o$din%
• Gas-assisted injection #o$din%
• In-#o$d deco)ation and in #o$d$a#ination
• Injection-co#*)ession #o$din%
• Injection #o$din% o+ $i,&id si$icone )&''e)
• Inse)t and o&tse)t #o$din%
•
La#e$$a) (#ic)o$ae)" injection #o$din%• Lo-*)ess&)e injection #o$din%
• Mic)oinjection #o$din%
• Mic)oce$$&$a) #o$din%
• M&$tico#*onent injection#o$din%(o.e)#o$din%"
• M&$ti*$e $i.e-+eed injection #o$din%
• Pode) injection #o$din%
•
P&s!-P&$$ injection #o$din%• Reaction injection #o$din%
• Resin t)ans+e) #o$din%
• R!eo#o$din%
• St)&ct&)a$ +oa# injection #o$din%
• St)&ct&)a$ )eaction injection #o$din%
•
T!in-a$$ #o$din%• /i')ation %as injection #o$din%
• 0ate) assisted injection #o$din%
• R&''e) injection
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Custom PlasticsInjection moldin
g- Well suited for high-quality, high- volume part manufacturing.
#ost .e)sati$e o+ a$$ injection #o$din% tec!ni,&es1
.a) in si2e and a)e )ated 'ased on *)ess&)e o) tonna%e1
#an t*es o+ *$astic )esins and additi.es &sed to inc)ease its 3e4i'i$it +o) desi%ne)s and en%inee)s1
t!e)e a)e #an en!ance#ents and c&sto#i2ation tec!ni,&es t!at can 'e &sed to *)od&ce t!e desi)ed5nis! and st)&ct&)e1 Injection #o$ds !ic! a)e &s&a$$ #ade +)o# stee$ contain ca.ities t!at i$$ +o)#t!e *a)ts1 Me$ted *$astic is injected into t!e #o$d 5$$in% t!e ca.ities1 T!e #o$d is coo$ed and t!e
*a)ts a)e ejected ' *ins1 T!is *)ocess is si#i$a) to a je$$o #o$d !ic! is 5$$ed t!en coo$ed to c)eatet!e 5na$ *)od&ct1
T!e #o$d #a7in% costs a)e )e$ati.e$ !i%!8 !oe.e) t!e cost *e) *a)t is .e) econo#ica$1
Lo *a)t cost a$on% it! )esin and 5nis! o*tions !a.e a$$ cont)i'&ted to injection #o$din%9s *o*&$a)it
in toda9s #an&+act&)in% $andsca*e1
MOLDING
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TYPES OF INJECTIONMOLDING
Blo !olding" Well suited for hollo o#jects, li$e #ottles
Fo$$os 'asic ste*s +o&nd in %$ass '$oin%1
A *a)ison (!eated *$astic #ass %ene)a$$ a t&'e" is in3ated 'ai)1
T!e ai) *&s!es t!e *$astic a%ainst t!e #o$d to +o)# desi)eds!a*e1 Once coo$ed t!e *$astic is ejected1
:i%! .o$&#e One-*iece !o$$o o'jects
C)eates .e) &ni+o)# t!in a$$ed containe)s e4t)e#e$econo#ica$
I1e18 ;ott$es
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TYPES OF INJECTIONMOLDING
Compression!olding " Well suited for larger o#jects li$e auto
parts.
A !eated *$astic #ate)ia$ is *$aced in a !eated #o$d
Co#*)essed into s!a*e1
P$astic can 'e in '&$7 '&t &s&a$$ in s!eets1
C&)in% (!eatin% *)oc" to #aintain its inte%)it1
Re#o.ed +)o# t!e #o$d1 I+ s!eetin% *$astic #ate)ia$ is &sed t!e #ate)ia$ is 5)stt)i##ed in t!e #o$d t!en )e#o.ed1
:i%!-st)en%t! co#*o&nds ie8 t!e)#osettin% )esins 5'e)%$ass and )ein+o)ced *$astics1
In.a$&a'$e *)ocess +o) t!e a&to#oti.e ind&st)1
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TYPES OF INJECTION
MOLDING%&trusion !olding" Well suited for long hollo formed applications li$e tu#ing,
pipes and stras.
E4t)&des t!e #e$ted *$astic di)ect$ into a die1
T!e die s!a*e not a #o$d dete)#ines t!e s!a*e o+ t!e 5na$*)od&ct1
T!e e4t)&ded <t&'in%= is coo$ed and can 'e c&t o) )o$$ed +o)
s!i*#ent1
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TYPES OF INJECTIONMOLDING
'otational!olding
('otomolding)" Well suited for large, hollo, one-piece parts.
>ses !i%! te#*e)at&)es and )otationa$ #o.e#ent to coat t!e inside o+ t!e #o$d and +o)#t!e *a)t1
T!e constant )otation o+ t!e #o$d c)eates cent)i+&%a$ +o)ce +o)#in% e.en-a$$ed *)od&cts1
S&ited to $a)%e !o$$o containe)s s&c! as tan7s s$o *)ocess1
:oe.e) .e) econo#ica$ *)ocess +o) *a)tic&$a) a**$ications and can 'e c!ea*e) t!anot!e) t*es o+ #o$din%1
/e) $itt$e #ate)ia$ is asted &sin% t!is *)ocess and e4cess #ate)ia$ can o+ten 'e )e-&sed#a7in% it an econo#ica$ and en.i)on#enta$$ .ia'$e #an&+act&)in% *)ocess1
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TYPES OF INJECTIONMOLDING
C*+CI*+• Eac! t*e !as its strengths and ea$nesses1
•
;e aare o+ t!e functions o+ eac! t*e to +&$5$$ t!eneed o+ t!e #an&+act&)e)
• /arious di0erent a**)oac! +o) #an&+act&)in%
so$&tion
• S!o&$d %et
insightful consultsa'o&t
a**$ications and suita#le materials'e+o)e *)oceedin% it! one #an&+act&)in% *)ocess
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Mo$dC$osed
Po$#e)
Injection
Mate)ia$S!)in7a
%e
>nsc)eo+ Mo$d
Coo$in%and
Re#o.a$
INJECTION MOLDING CYCLE Mo$d is c$osed
Injection o+ t!e*o$#e) into t!e
#o$d ca.it &nti$t!e ca.it is 5$$ed
!o$din%*)ess&)e is#aintained toco#*ensate+o) #ate)ia$s!)in7a%e
0!en sc)et&)ns ne4t s!ot is+ed to t!e +)ontsc)e1 T!isca&ses t!e sc)eto )et)act as t!ene4t s!ot is
0!en sc)et&)ns ne4t
s!ot is +edto t!e +)ontsc)e1 T!isca&ses t!esc)e to)et)act as
t!e ne4ts!ot is*)e*a)ed
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P L A S T I C
I N J E C
T I O N M O
L D I N G
I N J E
C T I
O N
A N D C L
A M P I
N G
> N I T
S
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INJECTION >NIT
1 method of injection2
- hydraulic plunger- rotating scre (e&truder)
3unction2
- 4etermine the amount of molten plastic entering the moldcavity (shot)
- 3ill mold cavity ith molten plastic - !elt plastic pellets into molten form
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ROTATING SCRE0 MET:OD
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:YDRA>LIC PL>NGER
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F>NCTION OF TORPEDO
5he function of the torpedo in the heating 6one is to spread the
polymer melt into thin 7lm in close contact ith the heatedcylinder alls. 5he 7ns, hich $eep the torpedo centered,also conduct heat from the cylinder alls to the torpedo,although in some machines the torpedo is heated separately
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CLAMPING >NIT
3unction2
- 5o hold and press the mold together
Considerations2
- a high 7lling pressure acts on the inside of the cavity.
- parting surfaces of the mold try to e&pand outard due tothis
pressure
- it is necessary to clamp the mold so that it does not open
- 8ash ill #e generated if the parting surfaces open evenvery slightly
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TYPES OF CLAMPING >NIT
5oggle clamp
9ydraulic clamp
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CLAMPING AND INJECTION PROCESS
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