Xem mẫu
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Caáu truùc – Tính chaát vaät lieäu 10
- Generated by Foxit PDF Creator © Foxit Software
http://www.foxitsoftware.com For evaluation only.
Caáu truùc – Tính chaát vaät lieäu 11
- Generated by Foxit PDF Creator © Foxit Software
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1.2. Ñaëc ñieåm
cuûa CN gia coâng
polime
Ñaëc ñieåm chaûy cuûa vaät lieäu trong
quaù trình gia coâng.
Caùc phöông phaùp ñoát noùng vaät lieäu
polime
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1.2.1. Ñaëc ñieåm chaûy.
Doøng chaûy nhôùt – doøng chaûy aùp suaát.
Profil vaän toác:
* doøng chaûy nhôùt coù daïng thaúng.
* doøng chaûy aùp suaát coù daïng parabol hay parabol
bieán daïng.
Tieát dieän chaûy coù theå thay ñoåi doïc theo chieàu daøi chaûy do
quaù trình laøm nguoäi.
Quaù trình chaûy khoâng ñaúng nhieät
Quaù trình chaûy – Quaù trình ñònh höôùng phaân töû
Quaù trình chaûy – Quaù trình ñoát noùng
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- Generated by Foxit PDF Creator © Foxit Software
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1.2.2. Caùc phöông phaùp
ñoát noùng
Ñoát noùng beà maët.
Ñoát noùng noäi:
* Ñoát noùng baèng ma saùt nhôùt
* Ñoát noùng baèng doøng ñieän cao taàn
* Ñoát noùng baèng sieâu aâm
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ÑOÁT NOÙNG BEÀ MAËT
Ba è ng da ã n nhieät:
Td: Ñoát noùng trong khuoân, trong xy lanh nguyeân lieäu
...
Ba è ng ñoái löu nhieät:
Td: Ñoát noùng tröïc tieáp baèng hôi nöôùc, baèng khoâng khí
noùng ....
Ñoát noùng ba è ng böùc xaï:
Td: Ñoát noùng baèng ñeøn hoàng ngoaïi ....
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Daãn nhieät
Q T
k
A x
Ñoái löu nhieät
Q
h T2 T1
A
Böùc xaï nhieät
Q
4 4
T1 T2
A
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ÑOÁT NOÙNG NOÄI
Ba è ng ba è ng ma saùt nhôùt:
G . 2
Ba è ng doøng ñieän cao taàn:
fV 2
G 13.3 x1014 2 tan
b
Ba è ng sieâu aâm.
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- Generated by Foxit PDF Creator © Foxit Software
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- Generated by Foxit PDF Creator © Foxit Software
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Ñoát noùng beà maët Ñoát noùng noäi
TA TB TA TB
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1.3. QUAN HEÄ
TRONG CN GIA COÂNG
POLIME
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1.3.1. Quan heä SP-GC-
VL
SAÛN PHAÅM
GIA COÂNG
VAÄT LIEÄU
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Tính chaát söû duïng
Ñieàu kieän söû duïng
SAÛN PHAÅM
Giaù caû
Hình daïng
Tính chaát saûn phaåm
Ñieàu kieän söû duïng VAÄT LIEÄU
Giaù thaønh SP
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Hình daïng SP
SAÛN PHAÅM Dung sai kích thöôùc
Giaù caû, saûn löôïng
PP gia coâng
Thoâng soá gia coâng GIA COÂNG
Thieát bò gia coâng
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Tính chaát nhieät
VAÄT LIEÄU Tính chaát löu bieán
Tính chaát hoaù hoïc
PP gia coâng
Thieát bò gia coâng GIA COÂNG
Caùc giôùi haïn cuûa TB
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1.3.1. Quan heä chaát löôïng SP-
Gia coâng
SAÛN PHAÅM
SAÛN PHAÅM
GIA COÂNG
VAÄT LIEÄU
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1.4. Phaân loaïi PP Gia
coâng
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