4. gating system sistem saluran
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7/24/2019 4. Gating System Sistem Saluran
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SISTEM SALURAN(GATING SYSTEM)
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Gating system (sistem saluran)
Bagian-bagian saluran pengecran!Pouring basin
Gate
sprue
Runner
MOULD CAVITY
Riser
Runner exten
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Bagian-bagian
sistem saluran(gating system)
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GATING RATI"
Gating rati! perban#ingan luas penampang sprue (As)$
runner (Ar ) #an gate (Ag)
Gating ratio
Pressurized Un pressurized
As>Ar>Ag AsArAg
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%euntungan sistem &ressuri'e#
Menamin pengisian lgam cair e #alam
rngga cetaan
Untu multiple gates$ lau aliran #i tiapgate aan relati* sama
&a#a umumnya +lume lgam lebi,
se#iit
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%erugian sistem pressuri'e#
Tera#i pla aliran turbulen
Lau yang tinggi aan menyebaban
tera#i ersi cetaan$ si#a lgam
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%euntungan un pressuri'e#
Lau lgam cair lebi, lambat #iban#ing
pressuri'e# system
Luas penampang main besar aan
Turbu!ensi ber"urang
Tida" ter#adi
se$buran !oga$ %air"e da!a$ rongga
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%erugian sistem un pressuri'e#
esain sistem saluran ,arus bai agar pengisianlgam cair teramin
Lau aliran tiap gate ti#a sama
Uuran runner #an gate besar
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./ Mampu menamin pengisian lgam cair
0/ Meng,in#ari ersi inti #an cetaan
1/ Mencega, tran masu
2/ Mengurangi turbulensi #an pembentuan #rss3/ Mencega, u#ara4gas tereba
5/ Menciptaan pembeuan terara,
P&R&'CA'AA'GATI'G (Y(T&M
YA'G )AI* A*A' +
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Tubulensi aliran
Turbulensi ti#a mungin #i,ilangan 6AN7A
#iurangi
intrl #engan bilangan Reynl#
Re80999 aliran streamline
Re:0999 mulai turbulen
#alam gating sistem 09998Re809999
baa Re:1399
µ
ρ Vd =Re
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6uum %ntinuitas Aliran
;<A.=.<A0=0
&ersamaan Bernulli untu aliran
Bila #itinau pa#a permuaan puring basin
#an uung terba>a, Sprue maa aan
#iperle,$#ianggap tanpa lsses
ρ ρ
2
2
21
1
1
22
P h
g
V P h
g
V ++=++
ghV 2=
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Bila lsses aliran #iper,itungan
engan :
hb a#ala, e,ilangan energi aliran pa#a belan
hf energi yang ,ilang aibat gesean
g
V K h b
b2
=
b f hh P
hV P
hV ++++=++
ρ ρ
2
22
1
11
=
g
V
d
fLh
p
f 2
2
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esign ?riteria *r &uring Basin
Pouring Basin ,arus #irancang untu #apat
menciptaan aliran seragam #an stea#y state
#engan segera/ %n#isi ini #apat #icapai
#engan !
./ Bentu yang streamline
0/ Menggunaan saringan1/ Memberi #am A!iran stead,
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&erencanaan Sprue
Lgam cair atu, pa#a spreu
aan e,ilangan teanan tapi
memperle, ecepatan
&la aliran aan menyebaban
#in#ing rnt$ aliran turbulen$+rte@ pa#a #asar sprue
Bentu sprue #ibuat taper
untu meng,in#arinya
Berlau !
1
2
2
1
h
h
A
A=
A-
A.
/-
/.
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Menurut persamaan tersebut maa bentu ,arus
parabli$ secara pratis #i#eati #engan membentu
ra#ius pa#a pintu masu sprue Sprue (luasan terecil < choke) menentuan lau aliran
lgam cair #an pouring tie
!hoke Area
"engan: <berat ben#a cran$ e<e*isien n''le$
#<#ensitas lgam cair$ t<puring time$ ,<,ea# e*eti*lgam cair
ght d eW C
A
2..
=
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&uring time
La#u tinggi
&rosi %eta"an
Per$u"aan "asar(usut ber!ebi/an
d!!
La#u renda/Pengisian tida"se$purna0)e"u ter!a!u %epat
Opti$u$pouring ti$e 1
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Kuningan (brass)$ perunggu (brn'e) puring time
ber+ariasi antara 15-45 detik untu ben#a urang #ari
.39 g
Coran baja$ bila berat ben#a cr (lb)
%<.$0 untu berat .99 lb$ %<9$2 untu berat .99 999 lb
W K t =
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Besi tuang elabuberat : .999 lb
berat 8 .999 lb
# berat ben#a cr $ *lui#ity *actr
Logam ringan
#ituang #engan *l> ratelambat untu meng,in#ariturbulensi$timbulnya gas#an #rss
3
853,095,0 wT K t
+=
wT
K t
+=
853,095,0
40
Fluidity K =
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Ne@t Time Re*erence ! R/B/ Gupta$ .$ %oun&r' Engineering $ Satya
praas,an$ Ne> el,i/
NECT TIMED//
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