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BAB 13
PROSES2 PENGECORAN LOGAM
1. CETAKAN SEKALI PAKAI
a. CETAKAN PASIR POLA DAN INTI (PATTERN & CORE)
CETAKAN DAN PEMBUATANYA OPERASI PENGECORANNYA
b. CETAKAN SEKALI PAKAI YANG LAIN. SHELL MOLDING
DENGAN POLA POLYSTYRENE INVESTMENT CASTING
2. CETAKAN PERMANEN
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CONTOH CORAN: RANGKA KOMPRESOR
BERAT !"" N
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1. CETAKAN PASIR
URUTAN LANGKAH2 PENGECORAN DNG CETAKANPASIR
D#$%a$ NDT (N$
'#*+,-# T#)
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POLA (PATTERN) DAN INTI (CORE)
P/a 0#0-/-- ++*a$ /#b- b#a* #'-- '* ' ++*a$
*'+4 %+$a 0#$%0#$a- #$5++a$.
Baa$: a5+4 /%a0 'a$ /a-4 0a-$% 0a-$% 0#0-/--
#+*a$%a$ 'a$ #/#b-a$
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Contoh pola yg lain.
A. P/a +$%%a/
B. P/a b#/a
C. P/a #*/#a
D. P/a '#$%a$ -#0 a/+*a$
E. P/a '#$%a$ aa$ #$5a0b+$%
6. Paa$ #$+$+$ +$+ /a *'a
G. P/a -a /#$%+$% +$+ -$-
5a$% b#a* 'a$ -a 'aa* +$+
a/+* /+*+
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P#$a0a$% ,#aa$ a-*
P*'+ b#*$%%a
Ca/# + 0#$aa$-$- (,*#) a%a* '
b#*%##* a-ba %a5a
a+$%. 6b78098, N;
6b : Ga5a a+$%
80: B#*a /%a0 ,a-*
8, : B#*a -$-
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Contoh Prosedur Pembuatan
Cetakan Pasir
A. B#/aa$ /a '-/#aa$ '-aa aa$ ,#aa$4 '*a%
-a '--- a-*.
B. D*a% #/a '-ba/- 'a$
aa$%a$ b#/aa$
/a '-/#aa$ '- aa$5a
C. C#aa$ #/a -a aa-
/#$%a '#$%a$ -$- < #*-$%
'-#$%a$5a.
'-ba/-
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CETAKAN
6-+* a-* ,#a:Pa-* ,#a a'a/a -/-,a (S-O2) aa+ -/-,a 5% '-,a0+* '$% 0-$#*a/
5% /a-$. 6a* #$#$+ a-* ,#a:Taa$ ++ -$%%-4 U+*a$ b+-*4
*aa 'a/a0 ,a0+*a$ (#*'-*-b+- '#$%a$ ba-) 'a$ b#$+ b+-*.
U+*a$ b+-* 5% #,-/ aa$ '-'aa #*0+aa$ ,*a$ 5% a/+4 #a-
++*a$ b+-* 5% b#a* 0#$-$%aa$ #*0#ab-/-a ,#aa$
(#0a0+a$ 0#/#a %a #/a0a #$+a$%a$ /%a0 ,a-* ).
B#$+ b+-* a-* 5% ' #*a+* 0#0b+a ,#aa$ /#b- +a 'a*-a'a b+-* 5a$% b+/a a*#$a #*0+aa$$5a a/-$% 0#$%+$,-4
$a0+$ a/ -$- 0#$+*+$a$ #*0#ab-/-a.
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Pa-* ,#a '-,a0+* '#$%a$ a-* 'a$ a$a /-a #ba%a- #$%-a
'#$%a$ a'a* 0a-$%2 ="> a-*4 3> a-* 'a$ ? > a$a /-a.
P#$%-a 5% /a-$ ' '-%+$aa$: *#-$ *%a$-, (#$/-, *#-$) 'a$
baa$ #$%-a -$*%a$-, ('-+0 -/-,a# 'a$ a#).
B#b#*aa baa$ #$%-a a$a #*/+ #0baa*a$ ,#aa$
'-a$a*a$5a: *#-$ 6+*a$ (#*'-*- aa @+*@+*a/ a//4 +*#a4'a$
@*0a/'#5'# )4 #$/-, 'a$ 0-$5a a/5'. C#aa$ a$a '-baa*
0#$-$%a /#b- +/#* 'a*- a'a ,#aa$ 5% #*/+ '-baa*(*a'--$a/) a*#$a +$%%++$ 'a/a0 +0/a *'+- 5% -$%%-
#0a0+a$ #$%$*/a$ '-0#$- #a ba-.
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MEMBENTUK RONGGA CETAKAN
TRADISIONAL DENGAN TANGAN
MEKANISASI 2)OLTING ('#$%a$ #$aa$%+$,a$%a$)
2)SUEEING ('#$%a$ #a$a$) 3)SLINGING ('-/#0a* '#$%a$ #,#aa$ -$%%-)
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INDIKATOR KUALITAS CETAKAN
PASIR
1. K+a: 0a0+ 0#0#*aa$a$ b#$+ 'a$ #*-a-ba a/-*a$ /%a0
2. P#*0#ab-/-a: aa-a ,#aa$ 0#/#a +'a*aa$a aa+ %a
3. Sab-/-a #*0a/:#0a0+a$ ,#aa$ -'a *#a(,*a,-$%) '-#*0+aa$ *$%%a ,#aa$ 'a$ *#ba(b+,/-$%) ' aa $a '% /%a0 ,a-*.
F. C//a-b-/-5: #0a0+a$ ,#aa$ 0#0b-a*a$
,*a$ 0#$5++ a$a 0#$%a/a0- *#a.. Daa '-'a+* +/a$%
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K/a-@-a- ,#aa$ a-*
K/a-@-a- ,#aa$ a-* 5% #*-$% '-%+$aa$:
1. G*##$'a$'
2. D*59a$'
3. S-$ 9'*-#'
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G*##$a$' M/'
T#*b+a 'a*- a-*4 a$a /-a 'a$ a-*.K#+$+$%a$:
K#+aa$5a ,++ ba%+
C//a-b-/-5 ba%+ P#*0#ab-/-a ba%+ D '-'a+* +/a$%M+*a
K#*+%-a$: Pa-* baa 'aa 0#$5#baba$ ,a,a4 #*%a$+$%
'a*- baa$ 'a$ b#$+ ,*a$
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D*59a$'
Ta$a /-a -'a '-%+$aa$4 #a-
0#$%%+$aa$ baa$ #$%-a *%a$- 4 'a$
,#aa$ '-baa* a'a #$ -$%%a 0#$,aa-
++ 2"" .' 32" "C. S##/a #0baa*a$4#*0+aa$ *$%%a ,#aa$ 0#$-$%a
#+aa$ 'a$ ##*aa$5a. P#$%$*/a$
'-0#$- /#b- ba%+ '-ba$'-$% %*##$a$'
0/' (,#aa$ baa)4 $a0+$ '#0--a$ D*59
a$' 0/' /#b- 0aa/4 'a$ *'+-@-a$5a 0#$+*+$
a*#$a '-#*/+a$$5a a+ #0baa*a$.
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S-$ 9'*-#'
#$- ,#aa$ -$- '-#*/# '#$%a$
0#$%#*-$%a$ #*0+aa$ *$%%a
%*##$a$' 0/' ##ba/ 1" .' 2 00
'#$%a$ 0#$%%+$aa$ *, (#0baa*
'% $/#)4 /a0+ #0a$a aa+ ,a*a
5a$% /a-$. M#$%%+$aa$ 0a#*-a/
#$%-a 5% ++ a%a* '-#*/##+aa$ #*0+aa$ 5a$% /#b- ba-.
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CETAKAN SEKALI PAKAI YANG LAIN.
J SHELL MOLDINGJ DENGAN POLA POLYSTYRENE
J INVESTMENT CASTING
J CETAKAN DNG PLASTER DAN KERAMIK(CERAMIC)
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Raa 0aa 0a#*-a/ a'+a$
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2. CETAKAN SEKALI PAKAI YG LAIN
(#/a-$ ,#aa$ a-*)
a. S#// 0/'-$% (,#aa$ +/-)
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S#// 0/'-$%
K#+$+$%a$: P#*0+aa$ ,#aa$ /#b-
a/+ '* ' ,#aa$ a-*(%*##$ a$' 0/')4#-$%%a a/-*a$ /%a0,a-* /#b- 0+'a 'a$a-/$5a /#b- a/+ b-a0#$,aa- 2. 0
T/#*a$- 5% b-a '-,aa- +%a ba%+ ".2 00
C//a-b-/-5 ba%+ '
0#$%-$'a*- b# aa+*#a$5a ,*a$.
P*#,/+'# 0a,-$-$%
K#*+%-a$: P/a /%a0 /#b- 0aa/ '*
' /a +$+ %*##$ a$',a-$%
T-'a #$0- -a 0/
*'+ #'-- L#b- a + #$%#,*a$
baa '% b#*a #*a*+*a$% 'a*- 1" %
C$ ,*a$:
*'a %-%-4 *+0a a+4b+-$%4 ,a0a@
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b. P#$%#,*a$ '% /a /55*#$#
P#$%#,*a$ '-/a+a$ '$% /a #a '-b-a*a$ '-'a/a0 ,#aa$. P/55*#$# /a$%+$% 0#$%+a b#%-+
/%a0 ,a-* '- +a$%.
/a
C+ & *+#
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,. VACUM MOLDING (a*a$%
'-%+$aa$ a*#$a 0aa/)
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'. INVESTMENT CASTING
1. P#0b+aa$ /a 'a*- /-/-$(a)4 '$% ,#aa$ 'a*-a5+
2. P/a '-*a- '% a/+*a$+a$% 5% +%a #*b+a '*a.
3. P#$,#/+a$ /a # '/0
0a#*-a/ aa$ ++-$%%-
F. Ha0-* #0+a#*0+aa$ /a #/a'-/a-- '% 0a#*-a/ aa$a$a.
. P/a '-ba/- +0#$%#/+a*a$ /-/-$4 '$%,a*a #0a$aa$.
. P#$+a$%a$ /%a0 ,a-*#'a/a0 *$%%a ,#aa$
?. P#0b$%a*a$ ,#aa$+ 0#$%a0b-/ *'+
,*a$
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KEUNTUNGAN:
1. Pa* (,*a$) '$% b#$+*+0- 'aa '-b+a a0a-# ba%-a$9ba%-a$*-$,-$5a.
2. T/#*a$- #0- 'aa'-,aa- -$%%a "."?00.
3. P#*0+aa$ a/+
F. 8a (/-/-$) 'aa '-%+$aa$ /a%-.
. P#$%#*aa$ /a$+ '%#0#-$a$ +0+$5a -'a'-#*/+a$ /a%- ($# a#*,#)
KEKURANGANNYA:
1. Maa/
2. Ha$5a + *'+ 5% #,-/.' ? /b.
S#0+a baa$ /%a0 ##*-baa4 a-$/# ##/4a'+a$ '$% -- /#b+* 5%-$%%- 'aa '-*#.
C$ ,*a$:
+'+ (b/a'#) 'a$0$#$ /a-$ 'a*- +*b-$4#*-aa$ 'a$ a/a ba$+#'#*a$ %-%-.
I$#0#$ ,a-$%
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S+'+ (b/a'#) a* 0#-$ +*b-$. P#*a-a$
ba%-a$ 5% #a*a a*-9a*- b#*+0/a 1"! b+a.
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PROSES9PROSES PENGECORAN
DENGAN CETAKAN PERMANEN
K#*+%-a$ #$%#,*a$ '#$%a$ cetakan sekali pakai a'a/a #-a *'+0#0#*/+a$ ,#aa$ ba*+.
Ka/a+ Cetakan permanen 'aa'-%+$aa$ b#*+/a$% a/-.
B#*-+ aa$ '-baa %:
P#$%#,*a$ '#$%a$ ,#aa$ #*0a$#$.D-# ,a-$%C#$*-@+%a/ ,a-$%.
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P#$%#,*a$ '#$%a$ ,#aa$ #*0a$#$
(#*0a$#$ 0/' ,a-$%)
T#*'-*- aa '+a ba%-a$ 5% '$% 0+'a '-b+a 'a$'-++ #,a*a #a.
C#aa$ #*b+a '* baa aa+ b#- +a$% D-0#$- 'a$ #aa*a$ #*0+aa$ ba%+
Baa$ 5% '-*#: A/+0-$+04 0a%$#-+04 #0ba%a '% a'+a$$5a4 b#- ,*
(+a$%). K++ + 0#$%/a baa$ baa4 ,#aa$ a*+ 'a*-baa$ 5% aa$ #0#*a+* -$%%-.
P#*0+aa$ *$%%a ' '-b#$+ '#$%a$ 0#$#0aa$-$-. Y% #*b+a 'a*- /%a0 +%a4 $a0+$ #*/+'-#*-0ba$%a$ #0+'aa$ #$%/#aa$ -$- #*#b+'a*- #0a$5a. Daa '-%+$aa$ -$- '* a-*4 'a/a0a/ -$- *# #$%#,*a$ '-#b+ semipermanent- mold casting.
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Ca*a #*a ba-, #*0a$#$ 0/'
,a-$%
La$%a #*-aa$ P#0a$aa$ ,#aa$:
a%a* /%a0 ,a-* '
0#$%a/-* # '/0 *$%%a
0#/a/+- a/+*a$ +a$% P#/a-a$: + 0#/#a
a$a. Da$ +
0#/+0a- #*0+aa$
,#aa$ a%a*0#0+'aa$
#$%a0b-/a$ ,*a$.
1)
2)
N#/
#$5#0*
I$-
F
R$%%a ,#aa$
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Gb. 3) #$+a$%a$ /%a0 ,a-*
Gb. F) ##/a #$+a$%a$ 'a$ b#%-+ /%a0 ,a-* 0#0b#+4 ,#aa$ #%#*a '-b+a 'a$ ,*a$ '-a0b-/4 %+$a
0#$%-$'a*- $*a- #$'-$%-$a$ 5% b#*/#b-a$. K$*a- b#*/#b-a$ ' 0#$5#baba$ *#a a'a ,*a$.
Gb. ) ,*a$ ##/a '-#/+a*a$ 'a*- ,#aa$.
5)3) 4)
C$ ,*a$: -$4 *+0a 0a
(+0 b'-#)4 bb* 0$#$ +
#aa 'a$ #$aa
F
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P#*0+aa$ a/+T/#*a$- #0-
C*a$ /#b- +a a*#$a *++* b+-* *-a/a/+
K#*+%-a$ ,#aa$ #*0a$#$U0+0$5a + /%a0 '$% -- /#b+* *#$'a
Ha$5a + *'+ 5% #'#*a$aHa$5a ,, + *'+- 0aa/4 -++$ '%$
0a- *#
K#+$+$%a$ ,#aa$ #*0a$#$
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Bb* a*-a- ,#aa$ #*0a$#$
A'a 3 a*-a- #$%#,*a$ '$% ,#aa$#*0a$#$. P*-$- 'aa*$5a a0a'#$%a$ ba-, #*0a$#$ < 0/' 5%
#/a '-baa4 5a-+:1. S/+ ,a-$%: '-0a$a ,*a$ #/a/+ b#*$%%a4
5% '-#*/# '%$ ,a*a 0#$+0aa$ #0ba/-#ba%-a$ b$ 5% b#/+0 0#0b#+4 5a-+ '-ba%-a$ 5% a+ '* #*0+aa$ ,#aa$. C$*'+: a*,a4 0a-$a$ '//.
2. L *#+*# ,a-$%
3. Va,++0 #*0a$#$ 9 0/' ,a-$%
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L#* < *#+*# ,a-$%
Da/a0 #*0a$#$ 0/' 'a$ /+ ,a-$% /%a0 ,a-* 0a+ # *$%%a ,#aa$ '-#baba$
a'a$5a %a5a %*a-a-4 #'a$%a$ ' / *#+*# ,a-$% '-%+$aa$ #a$a$ +'a*a4 /-.
Ga0ba* '- baa.
D- -$- '-%+$aa$ +'a*a #a$a$
*#$'a4 ".1 MPa4 + 0#$#a$
/%a0 ,a-*
L%a0 ,a-*
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Va,++0 #*0a$#$ 0/' ,a-$%
Ha0-* a0a '$% /9 *#+*# 0/' ,a-$%4
#*b#'aa$$5a a'a/a /%a0 'aa 0#$%a/-*
# 'a/a0 *$%%a ,#aa$ a*#$a '-#baba$
a'a$5a a*-a$ *+a$% a0a (a,++0) 'a*-*$%%a ,#aa$.
K#+$+$%a$ ,a*a -$- a'a/a *-a 'a$
,a,a <,a,a /a-$$5a (5% #*a- '$% *-a)
#*a #+aa$ /#b- ba-4 '-ba$'-$%a$ '$%,a*a #$%#,*a$ #a$a$ *#$'a.
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CETAKAN PERMANEN
(PENCETAKAN DIE CASTING)
L%a0 ,a-* '--$#-a$ # 'a/a0 *$%%a,#aa$4 '$% #a$a$ -$%%- ? .' 3" MPa
T#a$a$ #a '-#*aa$a$ #/a0a *# .'
#$%a0b-/a$ *'+.C#aa$$5a '-#b+ DIO#*a- '-# ,a-$% '-/a+a$ '% '-#9,a-$%
0a,-$#4 /-a Ga0ba* b#*-+. A'a '+a -#
0#-$4 5a-+: R+a$% a$a ( ,a0b#*) R+a$% '-$%-$ (,/' ,a0b#*)
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K$@-%+*a- +0+0 0#-$ #$,#a
D-# ,/-$%
,5/-$'#*
T%%/# 0#,a$-0
M-$% /a#$ G+-'# *'
Mab/# '-# a/@
6- '-# a/@
P+*-$% /#
,5/-$'#*
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M#-$ #$,#a *+a$% a$a
1. R$%%a ,#aa$ -a '--- /%a0 ,a-*
2. P*# #$,#aa$ #'a$% b#*/a$%+$%
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3. P#$%/#aa$ #$,a$ b#$'a #*a ##/a /%a0,a-* 0#0b#+ 'a$ ##,* 0#$aa$ b#$'a #*a aa0-$% '-# a/@ b#*%##* # -*-.
F. *'+
P*'+
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M#-$ #$,#a *+a$% '-$%-$
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M#-$ ,#a #$*-@+%a/
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H*-$a/:N73"π(2 % G6D)1C2
N :+a*a$ ,#aa$ *0;% :%*a@-a-G6 : G @a* (" .' !")
D : D-a0##* 'a/a0 'a*- ,#aa$ 00;R : D2V : K#,#aa$ a$%#$-a//-$-#*
6 7 02R (%a5a #$*-@+%a/)
G67 6 88 7 0% (b#*a ,*a$)
V#*-a/:
N73"πQ2 %L(R29Rb
2)12
R : *a'-+ 'a/a0 a/-$% aa
Rb : *a'-+ 'a/a0 ba%-a$ baa.
L : -$%%- ,*a$4 b-aa$5a 0a-0a/
'+a a/- D
P#$%-+$%a$ P+a*a$
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S#0- ,#$*-@+%a/
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,#$*-@+%#
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Da+*T+$%+ P#0baa*a$
(@+*$a,#)
Da/a0 #0+a *#
#$%#,*a$4 /%a0
a*+ '-a$aa$
-$%%a 0#$,a-* +
'-+a$% aa+ '-'*$%0a+ # 'a/a0 *$%%a
,#aa$. P#0a$aa$
'a$ #$,a-*a$ '-/a+a$
'- 'a+* +$%+#*a-a$ (@+*$a,#)
B#b#*aa -# 'a+* 5a$%
+0+0$5a a'a '- ab*-
#$%#,*a$
1. C+/a
2. D-*#, @+#/ @+*$a,#
3. C*+-b/# @+*$a,#
F. E/#,*-, a*, @+*$a,#
. I$'+,-$ @+*$a,#
7/23/2019 PROSES PENGECORAN(CASTING)
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C+/a
Ha$5a + b#- ,* -*$ #*'-*- aa -%
-*$ (besi mentah hasil dari
tanur tinggi:blast furnace)
'a$ ,*a (termasukriser, saluran turun, saluranmasuk dari sisa pengecoransebelumnya)
C#(ba+ba*a '-/a)6/+: ba+a+*
I*$4,#4
@/+4
+$+*
a'+a$
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C*+-b/# @+*$a,#
(-$'-*#, @+#/9@-*#' @+*$a,#)
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E/#,*-,9a*, @+*$a,#
L%a0 '-,a-*a$ '#$%a$ a$a 5%
b#*aa/ 'a*- b++* a- /-*-.
Bb* $@-%+*a- a'a 5% 0#$%%+$aa$ 2
aa+ 3 #/#*'a.
K$+0- 'a5a ,++ b#a* 5% 0a0+
0#0*'+- baa +a$% 2 .' "
$a0
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I$'+,-$ @+*$a,#
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M#$%%+$aa$ /-*- AC + 0#$-0b+/a$
0#'a$ 0a%$- ' /%a04 'a$ 0#$%a-/a$
a*+ /-*- -$'+- 5% ,#a 0#0a$aa$
/%a0. M#'a$ %a5a #/#*0a%$-0#$5#baba$ #$,a0+*a$ /%a0 ,a-*.
L%a0 ,a-* ' $a '$% #/#0#$ #0a$a4
% +a/-a 'a$ #0+*$-a$ a'+a$ #*a%a
'$% ba-. Baa$: baa4 b#- ,*4 'a$ a'+a$a/+0-$-+0.
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CACAT CORAN
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PENYEBAB CACAT
M- *+$: @/+-'-a +*a$%4 #0*+* +a$% *#$'a4 #$+a$%a$
#*/a/+ /a0ba4 'a$ #$a0a$% +a$% #*/a/+ --
C/' +: /%a0 ,a-* 0#$%a/-* b#*a0a a0a #a- -'a
b#*#0+ 0#$5a0b+$%. P#$5#bab a0a '$% 0- *+$
C/' : a'a$5a #*,-a$ #$+a$%a$4 0#0a'a (/-') 'a$#*#*a$%a '- ,*a$. P*#'+* #$+a$%a$ 'a$ -#0 a/+*a$
+a$% '-#*ba--.
S*-$a%# ,a-5: a-ba #$5++a$. Ra-#* #*/+ '-*a$,a$%
5a$% /a5a.
M-,**-5: #*a'- a'a a'+a$4 a-ba *# #0b#+a$ 5%b#*/a*+9/a*+.
H #a*-$%: ,//a-b-/-5 ,#aa$ 5% b+*+.
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Ca,a ,*a$ ,#aa$ a-*
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Sa$' b/: #*a'- '- ba%-a$ '#a a/-$% aa4 a-baa'a$5a %a 0#0b#$+ *$%%a2 ba/$. P#*0#ab-/-ab+*+ aa+ ,#aa$ #*/a/+ baa.
P-$/# #*a'- #'-- '- baa #*0+aa$. Sa0a
Sa$' a: a'a$5a #*- S,ab: #*0+aa$ aa*4 #*0+aa$ ,#aa$ 5% /#a
0a+ # #*0+aa$ ,*a$ P#$#*a-$: /%a0 ,a-* #*/a/+ #$,#*
M/' -@ a$a*a + 'a$ '*a% b#*%##* C*# -@: b#*%##* # aa a-ba %a5a a+$% M/' ,*a,: ,#aa$ +*a$% +a
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