chuong 3 co so thiet ke khuon

8/12/2019 Chuong 3 Co So Thiet Ke Khuon

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Ngy 25 thng 2 nm 2014 CHNG 3 C S THIT K KHUN

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CHNG I

C S THIT K KHUN

1.1. Gii thiu chung v khun mu to hnh.

Khun l dng c to hnh cho cc thit b da trn cc phng php to hnh khc nha.

Kch thc v kt cu ca khun ph thuc vo kch thc v hnh dng ca sn phm.

Thng thng vic phn loi khun da trn cc phng php gia cng nh: khun c, khun dp,khun rn

Cc c im cn ch khi thit k khun:Xc inh loi khun cn thit k.

Xc nh tnh nng k thut, tui th, hnh thc s dng ca khun.

La chn vt liu v phng php x l b mt to hnh khun.

La chn phng php ch to khun, trang thit b, my mc

1.2. Khun cho sn phm nha.

c s dng to hnh cho sn phm nha theo phng php gia cng khc nhau.

Vic phn loi khun cho sn phm nha ch yu da trn hai phng php: Phng php gia cngv theo kt cu khun.

Theo phng php gia cng nha c:


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- Khun p: Dng khun ny dng to hnh sn phm nha t nguyn

liu nha dng nung nng v p vo lng khun.

- Khun n: c s dng to ra cc sn phn dng tm, thanh, ng..

- Khung to hnh nhit p: S dng lc p tp hnh sn phm, loi

khng ny t c s dng.

- Khun thi nh hnh: c s dng to hnh cc chi tit rng nh

chai, l

Phn loi theo kt cu khun c:

Khun mt lng khun.

Khun nhiu lng khun.

Khun hai tm.

Khun ba tm.

Khun khng c h thng knh nha.

Khun nhiu tng

1.3. Phn loi khun.

1.3.1. Khun hai tm.

1.3.1.1. Kt cu chung ca mt b khun hai tm.


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Hnh 1.1 Kt cu khun hai tm.

1.3.1.2. Khun hai tm c knh dn ngui.

Khun hai tm l loi khun ph bin nht. so vi khun ba tm th khun hai tm n gin hn, rhn v c chu k p phun ngn hn.

i vi khun hai tm c mt lng khun th khng cn thit phi thit k knh dn nha mnha s in y trc tip vo lng khun thng qua bc cung phun.

i vi khun hai tm c nhiu lng khun th ta cn quan tm n vic thit k knh dn

nha v ming phun sao cho nha c th in y cc lng khun cng lc(vn cn bngdng chy ca nha)

V vn cn bng dng chy nha v i hi cc ming phun phi b tr thng hng vi cclng khun m vi thit k khun hai tm c nhiu lng khun gp hn ch i vi mt ssn phm nha nht nh. khc phc hin tng ny ngi ta dng n khun ba tm haykhun hai tm c knh dn nng.


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1.3.1.3. Khun hai tm c knh dn nng.

Khun hai tm c knh dn nng lun gi cho nha nng chy trong bc cung phun, knh dn vming phun. Nha ch ng c khi n chy vo lng khun. Khi khun m ra th ch c sn phmc ly ra ngoi. Khi khun ng th nha trong knh dn vn nng v tip tc in y vo lngkhun mt cch trc tip.

Hnh 1.2 Khun hai tm c knh dn nng

i vi loi khun ny, cc ming phun c t v tr trung tm ca cc lng khun. iu nyc ngha l kn dn phi c t xa mt phn khun.Nhng iu ny khng gy bt k tr ngi nocho vic thit k.

u im:

Tit kim vt liu.

Khng c vt ca ming phun trn sn phm.

Gim thi gian chu k p phun.

iu khin c s in y v dng chy ca nha.

Nhc im:

Gi thnh cao hn khun hai tm c knh dn ngui.

Kh i mu vt liu.

H thng iu khin nhit d b hng.

Khng thch hp vi nhng vt liu chu nhit km.

1.3.2. Khun ba tm.


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So vi khun hai tm th h thng knh dn nha ca khun ba tm c t trn tm th hai songsong vi mt phn khun chnh. Chnh nh tm th hai ny m knh dn v

cungphun cth cri ra

khi snphm khimkhun( tct uikeo).

Hnh 1.3: Khun ba tm

Khun ba tm c dng khi ton b h thng knh dn khng th b tr trn cng mt mt phngnh khung hai tm. iu ny c th l do:


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Khun c nhiu lng khun.

Khun c mt lng khun nhng phc tp nn cn hn mt v tr phun nha.

Kh khn trong vic chn v tr phun thch hp.

V cn phi cn bng dng chy nha gia cc kn dn vi nhau nn buc phi thit k knh

dn khng nm trn mt phn khun.

im c trng ca khun ba tm l t ct ui keo.


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Hnh 1.4: 1,2,3 Trnh t m

Cc tm trong khun

ba tm

u im.

Gi thnh thp hn khun hai tm c knh dn nng.

t b hng hc hn khun c knh dn nng.

C th ph hp vi vt liu chu nhit km.

Nhc im.

Chu k p phun tng do hnh trnh ca dng nha n c lng khun di.

Lng ph nhiu vt liu.

Cn p sut phun ln in y.

1.4. Thit k lng khun.

1.4.1. S lng khun.

Ta c th cn nhc chn s lng khun ph hp nh cc thng s sau:

Kch c ca my p phun ( Nng sut phun, lc kp ln nht).

Thi gian giao hng.

Yu cu v cht lng sn phm.

Kt cu v kch thc khun.

Gi thnh khun.S lng khun thng thng c thit k theo dy s 2, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128.V cc lng khun s d dng c sp xp theo hnh ch nht hoc hnh trn.

Thng thng ta c th tnh s lng khun cn thit trn khun bng cch da vo: s sn phm,nng sut phun, nng sut lm do ca my p phun, lc kp khun ca my.

1. S lng khun tnh theo s lng sn phm t hng.


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N=L.K.tc/(24.3600.tm)

Trong :

N: s lng khun ti thiu.

L: s sn phm trong l sn xut.

K: h s do ph phm K=i-k vi k l t l ph phm.

tc : thi gian ca mt chu k p phun(s)

tm:thi gian hon tt l sn phm(ngy).

2. S lng khun tnh theo nng sut phun ca my p phun

N=0,8.S/W

Trong :


S: nng sut phun ca my(gam/mt ln phun)

W: trng lng ca sn phm (gam).

3. S lng khun tnh theo nng sut lm do ca my.

N=P/(X.W)

Trong :

N : s lng khun ti thiu.

P: Nng sut lm do ca my (g/ph)

X: tn s phun trong mt pht

W: trng lng ca sn phm(g)

4. S lng khun tnh theo lc kp khun ca my

N=S.P/Fp

Trong :


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Fp : lc kp khun ti a ca my(N).

S: din tch b mt trung bnh ca sn phm k c cc rnh dn theo hng ng

khun(mm2).

P: p sut trong khun(Mpa).

1.4.2. Cch b tr cc lng khun.

Trn thc t , ngi ta thng b tr cc lngkhun the o kinh nghim m khng c bt kmt s tnh ton hay m phng no. Nhng nulm nh vy i khi ta gp phi mt s li trnsn phm. c bit vi nhng khun c cclng khun khc nhau, lm ta phi sa likhun do rt tn km v thi gian v chiph. Do trnh li ny ta m phng qutrnh in y ca tng lng khun m khngc h thng knh dn bit chng c iny nh th no. Khi y ta s thit k h thng

dn nha to s cn bng ng cho tng lng khun.

Hnh 1.5: Cch b tr lng khun thng gp

Khi b tr s lng khun, ta nn b tr cc lng khun theo s sau:


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Hnh 1.6: Cc kiu b tr lng khun dng hnh ch nht

Hnh 1.7: Kiu b tr lng khun dng trn v thng

1.5. Thit k h thng dn nha(Feed system).

H thng dn nha trong khun c tc dng a nha t vi phun ca my p phun vo cc lngkhun. H thng ny gm: Cung phun, knh dn v ming phun. Thng thng trong cc thit kngi ta thit k knh dn v ming phun trc ri mi n cung phun v kch thc ca cungphun ph thuc nhiu vo kch thc v min phun.


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Hnh 1.8: H thng dn nha

1.5.1. Cung phun(Sprue).

Cung phun ni trc tip vi vi phun ca my p a nha vo knh dn qua ming phun v vo

cc lng khun.

Hnh 1.9: V tr cung phun.

u cung phun nn cng nh cng tt nhng vn phi m bo s in y ng u gia cc lng

khun vi nhau. Gc cn ca cung phun cn phi ln thot khun nhng ng knh cungphun th khng nn qu ln s lm tng thi gian lm ngui v tn vt liu.


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Hnh 1.10: Kch thc cung phun cho thit k.

Trn thc t ngi ta t khi gia cng l cung phun lin trn khun t trc(tr nhng khun ngin, r) m dng bc cung phun tin cho vic gia cng thay th.

Hin ti, trn th trng c ba loi bc cung phun ph bin c v dng knh ngoi 12, 16, 20 tytheo khi lng ca sn phm, kch thc knh dn v ng knh ca vi phun trn my phun mta dng loi bc cung phun no cho ph hp.


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Hnh 1.11: Mt s loi bac cung phun

Hnh 1.12: Mt s loi vng inh v


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Hnh 1.13: Bc cung phun trn khun

Trn khun cung phun s c y ri khi khun cng lc vi sn phm. Do cn c b phnko cung phun lai trn tm di ng khi khun m m cung phun c th ri khi bc cungphun. Thm vo , ngi thit k c th li dng phn nha gi cung phun lm ui nguichm, nh m qu trnh in y cc lng khun tt hn.

Hnh 1.14: a) Dng cung phun c ko nh cn ngc(tt nht)


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b)Dng cung phun hnh ch Z

c)Dng cung phun c ko nh rnh vng(t dng)

d) Dng cung phun c ko nh cht dy u bi(t dng)

1.5.2. Cc knh dn( runner).

Cc knh dn nha l cu ni gia cc ming phun v cung phun. Chng lm nhim v a nhavo cc lng khun. V th khi thit k chng cn phi tun th mt s nguyn tc k thut mbo cht lng cho hu ht sn phm. Sau y l mt s nguyn tc m ta cn phi tun th:

Gim n mc ti thiu s thay i tit din knh dn.

Nha knh dn phi thot khun d dng.

Ton b chiu di knh dn nn cng ngn cng tt, trnh mt p lc v mt nhit trong qutrnh in y.

Mt ct knh dn phi ln m bo s in y cho ton b sn phm m khng lmthi gian chu k qu di, tn nhiu vt liu v lc kp ln.

1. Cc loi tit din ngang ca knh dn nha.

Knh dn c nhiu loi mt ct khc nhau nhng ph bin vn l cc loi mt ct ngang hnhtrn, hnh thang, hnh ch nht, hnh bn nguyt


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Hnh 1.15:Tit din ngang ca mt s loi knh dn.

Ty tng loi khun m ta thit k tit din knh dn cho ph hp. Mc d loi knh dn c titdin ngang hnh trn l tt nht nhng gi thnh gia cng cao nn trn thc t ngi ta hay dngknh dn c tit din ngang hnh thang hiu chnh hoc hnh thang v gi thnh gia cng thp hn.

Loi knh dn c tit din ngang hnh thang thng dng trong khun 3 tm v loi khun ny mtphn khun s d b lch nu ta dng knh dn c tit din hnh trn.

Hnh 1.16: Kh gia cng knh dn c tit din ngang hnh trn

so snh cc loi knh dn ngi ta dng ch s ng knh thy lc v s cn dng. Khi ngknh cng ln th s cn dng cng b. Ta c th tnh ng knh thy lc da vo cng thc sau:

Dh= 4A/P Trong

Dh: ng knh thy lc.

A: Din tch mt ct ngang.

P: Chu vi.


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2. Kch thc knh dn.

Vic tnh ton c c ng knh v chiu di knh dn ph hp l rt quan trng v khi cmt knh dn qu ln hay qu di s lm cn tr dng chy v gy ra mt p trn chnh n, tnnhiu vt liu v thi gian chu k phun p. Do , ta nn thit k knh dn nh mc c th

li dng nhit ma st trn n gia nhit cho nha lng gip qu trnh in y lng khun thunli hn v sn phm t b qu nhit.

Hnh 1.17: Kch thc cho thit k knh dn

Kch thc knh dn chnh

Mi ln r nhnh th ng knh knh dn nhnh phi nh hn knh dn chnh mt cht, v skinh t hn nu ta dng t vt liu.

Cng thc tnh ng knh knh dn chnh:

Dc= Dn.N1/3

Trong Dc: ng knh knh dn chnh(mm)

Dn: ng knh knh dn nhnh(mm)

N : s nhnh r.

ui ngui chm trn knh dn v cung phun.

phn vt liu ch r nhnh khng b ng c sm gy nghn dng ta nn thit k uingui chm. ui ngui chm s gip cho qu trnh in y din ra nhanh v tt hn.


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Hnh 1.18 Kch thc thit k ui ngui chm

1.5.3. Ming phun cho knh dn ngui(Gate).

Ming phun l ming ni knh dn vi lng khun. Ming phun c chc nng rt qua trng l anha in y lng khun v th nn vic tnh ton kch thc v b tr minh phun c nghaquyt nh n cht lng ca sn phm.

Hnh 1.19: Ming phun trn khun

1.5.3.1. Phn loi ming phun.

a. Ming phun ct bng tay


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Ming phun ct bng tay l mt loi ming phun dnh theo sn phm sau khi p phun. Ta s d dngnhn ra cc sn phm nha c ming phun ct bng tay qua vt ct cn li trn b mtsn phm. Do , vi loi ming phun ny nn thit k kch thc nh mc c th m bo tnh thm m cho sn phm.

Mt vi l do s dng loi ming phun ct bng tay.

- Sn phm cn ming phun ln gip in y tt.

- Sn phm lm bng vt liu t bin dng.

- Cn tit din rng c s phn phi lu lng ng thi nh m cc phn t si t c snh hng c trng.

b. Ming phun t ct

Ming phun t ct l loi ming phun t ri sn phm sau khi m khu. iu ny t

c nh vo kt cu khun(Khun ba tm). hoc h thng y cung phun v snphm.

Mt s l do dng ming phun t ct

khng phi thm nguyn cng ct hon thin sn phm.

Tnh thm m ca sn phm (du vt ming phun s cn li rt nh)

Gi thi gian chu k cn thit khng i qua tt c cc ln phun

1.5.3.1. Cc ming phun ct bng tay.

a. Ming phun trc tip

Loi ming phun trc tip thng c dng cho cc khun c mt lng khun, ni m vt liuc in y vo khun mt cch trc tip m khng thng qua h thng knh dn. Chnh vkhong qua h thng knh dn nn vic mt p lc trong qu trnh in y l rt b. Tuy nhin,nhc im ca loi ming phun ny l vt ct ln trn b mt sn phm. S co rt c quyt nhbi b dy ca sn phm v ng knh ming phun. in hnh l s co rt ca phn nha gn ming

phun s nh li v ti ming phun s ln. iu ny a n hu qu l ng sut cng gn ming phunln.


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Hnh 1.20: Ming phun trc tip v vt

ct n lai trn sn phm.

Hnh 1.21: Kch thc cho thit k ming phun trc tip


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b. Ming phun kiu bng.

Ming phun kiu bng thng dng lm gim ng sut trong lng khun v ngn nga li to uicho cc chi tit mng v phng. ng sut sinh ra trong lng khun s c tp trung bng m sc ct b sau khi phun p.

Ming phun kiu bng ph hp cho cc loi nha PC, Acrylic, SAN, ABS

Hnh 1.22: Ming phu kiu bng v vt ct m n li trn sn phm.

Kch thc khuyn dng cho thit k:


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Hnh 1.23: Kch thc cho thit k ming phun kiu bng

c. Ming phun cnh.

L loi ming phun thng dng, c th dng cho nhiu loi sn phm bi kt cu rt n gin vkhng cn chnh xc cao.

Ming phun kiu cnh c t trn mt phn khun v in y lng khun t bn hng trn haydi.


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Hnh 1.24: Ming phun kiu cnh v vt ct m n li trn sn phm.Kch thc khuyn dng cho thit k.

Hnh 1.25: Kch thc cho thit k ming phun cnh

d. Ming phun kiu gi.


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L loi ming phun tng t nh ming phun kiu cnh, ch khc nhau ch l ming phun nm lptrn mt sn phm.

Hnh 1.26: Ming phun kiu gi

e. Ming phun kiu qut.

Ming phun kiu qut thc cht cng l ming phun cnh c b mt rng b bin i. Ming phun

ny to dng chy m v cho php in y lng khun mt cch nhanh chng nn rt ph hp chonhng sn phm ln v dy. Thm vo , ming phun kiu qut cng to ra dng chy lan ta nngip trnh c ng hn ni c b dy mng trn sn phm.


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Hnh 1.27: Ming phun kiu qut v vt ct m n li trn sn phm.

Ming phun kiu qut nn c lm cn c hai b rng ln b dy c mt ct ngang khng i,iu ny gip m bo:

Vn tc chy bng hng s.

Ton b b rng c dng cho lu lng.

p sut nh nhau qua ton b rng.

Kch thc khuyn dng cho thit k.

Hnh 1.28: Kch thc thit k cho ming phun kiu qut.


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f. Ming phun kiu vng.

Ming phun kiu vng thch hp cho nhng sn phm c dng tr rng v gip hn ch vt hn, ktkh trong qu trnh in y v gim ng sut tp trung quanh ming phun. C hai loi ming phunkiu vng: Kiu vng ngoi ra kiu vng trong.

Hnh 1.29 a) Ming phun kiu vng ngoi.

b) Ming phun kiu vng trong.


D= (S+1,5) (4/3)S + k (mm)

L= 0,5 1,5

H= (2/5)S 2

r = 0,2S

k= 2 (mm) vi sn phm c di dng chy ngn v dy.


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h. Ming phun ngm.

Ming phun ngm thng c dng trong khun hai tm c nhiu lng khun. Khi thit k snphm nh v cn ct keo mt bn ta nn ngh n kiu ming phun ny.

Hnh 1.32: Ming phun ngm v vt ct li trn sn phm.

C hai loi ming phun ngm: Ming phun ngm dng thng v ming phun ngm dng cong.

Ming phun ngm dng thng:

Hnh 1.33: Cc loi ming phun ngm dng thng.


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Hnh 1.34:Qu trnh ct ming phun ngm dng thng.

Kch thc khuyn dng cho thit k.


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Hnh 1.35: Kch thc cho thit k ming phun ngm tiu chun.

Hnh 1.36: Kch thc cho thit k ming phun ngm hiu chnh.

Ming phun ngm dng cong:


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Hnh 1.37: Qu trnh ct ming phun ngm dng cong.


Hnh 1.38: Kch thc cho thit k knh dn v cung phun kiu ngm.


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Hnh 1.39: Kch thc cho thit k ming phun ngm dng cong.

1.6. H thng dn hng.

H thng dn hng gm cht dn hng v bc dn hng.

Hnh 1.40: H thng dn hng trn khun.

1. Cht dn hng.

1. Loi trn (Khng c vai)


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2. Loi c vai

2. Bc dn hng.

1. Loi trn.

2. Loi c vai.


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3. Loi khng vai t bi trn.

4. Loi c vai t bi trn.

1.7. H thng li mt bn.

Sau khi thit k xong mt phn khun cho sn phm, nhiu khi c mt s b phn trn sn phm bvng khng tho ra c theo hng m khun. Lc ny ta cn phi c mt h thng gi l hthng li mt bn tho cc phn b vng.


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1.7.1. Cc kt cu tho li mt bn nh hng m khun.

1.7.1.1. Cam cht xin.

Hnh 1.41 Tho li mt bn nh cam cht xin.

Hnh 1.42: Tho li mt bn bng cam cht xien kt hp l xo.


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Mt s kiu c chn c ch to sn cho li mt bn.

Kiu 1

Kiu 2


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Kiu 3: Ct sp hoc bi sp, i khi n gin ha ngi ta ch dng mt vin bi v mt lxo.

1.7.1.2. Cht c mt cam.

1.7.1.3. Cht do.


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1.7.1.4. Cht xin.


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Hnh 1.43: Khun dng cht xin kp.

1.7.1.6. Cam chn ch.


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1.7.1.7. Cht tho c li cn.


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Mt s kiu u tho ca cht c li cn.


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1.7.1.8. Trt theo ng cam.

1.8. H thng lm ngui khun.

Nha lng sau khi vo khun phi c lm ngui tht nhanh t c hnh dng nh ta mongmun. Nu lm ngui khun khng tt nha nng s gia nhit thm cho khun lm ko di chu kphun p. Do h thng lm ngui c vai tr ht sc quan trng v n quyt nh chu k phun p.


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1.8.1. Cc phng php lm ngui.

1.8.1.1. Lm ngui bng kh.

Khun c lm ngui bng kh nh vo s bc x nhit ca thp lm khun ra mi trng xungquanh.

Hnh 1.44: Khun c lm ngui bng kh.

1.8.1.2. Lm ngui bng nc hoc hn hp ethylenglycol v nc.

y l phng php c dng rng ri hin nay. Theo phng php ny, khun c lm nguinh vo cc knh dn cha cht lm ngui c b tr trong cc tm khun.


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Hnh 1.45: Khun lm ngui bng cht lng.

1.8.2. Nhng iu cn lu khi thit k h thng lm mt

- m bo lm ngui ng u cho ton b sn phm. Do , cn ch n vic lm ngui nhngphn dy nht ca sn phm.

1. ng ng nhit b) Knh dn ngui c) m nng.


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Hnh 1.46: B tr knh dn lm ngui u sn phm

Knh dn ngui nn c t gn mt phn khun khi c th lm ngui tt hn.

ng knh knh lm ngui thng ln hn 8mm, nn khng i trn ton b chiu di knh trnh cn dng v s tc nghn s lm trao i nhit khng tt.

Nhit chnh lch gia u vo v ra nm trong khong 2 n 3oC . Thng thng nhit

u vo nn thp hn nhit khun m ta mong mun l 10-20oC. Nhit chnh lch gia

cht lng lm ngui v thnh knh dn nn nm trong khong 2-5ol tt nht(theo ti liumoldflow).

Nn chia knh dn lm ngui thnh nhiu vng lm ngui. Khng nn thit k chiu di knhlm ngui qu di v d lm mt p lc v tng nhit trn n khin > 3oC.

Knh lm ngui phi c khoan c nhm to ra s chy ri trong knh. Dng chy ris trao i nhit tt hn dng chy tng t 3-5 ln.

Hnh 1.47 Knh dn ngui khng nn qu di.

1.9. H Thng y.


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Sau khi sn phm trong khun c lm ngui, khun c m ra. Lc ny, sn phm vn cn dnhtrn tm khun ng do s ht ca chn khng nn cn h thng y y sn phm rt ra.

1.9.1. H thng y dng cht y.

Cc cht y c gia cng rt chnh xc v c chn theo tiu chun. Thng thng, cc chty ch c gia cng chnh xc phn dn hng v c lp theo h thng trc. cng ca

thn cht khong 60-65 HRC, cng trn u cht khngr 30-35 HRC.

Hnh 1.48: Cc phn t trong h thng y.

Mt s loi cht y:


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1.9.2. H thng y dng li.

Li y dng y nhng sn phm c thnh mong v hnh dng phc tp. Trong trng hp nuta dng cht y trn th s khng hiu qu v khng c lc y, hoc nu lc th sn phmc vt hn su vo.

Hnh 1.49: H thng y dng li y.

1.9.3. H thng y dng ng y.

ng y dng y nhng sn phm c dng trn xoay hoc tm mng.


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Hnh 1.50: ng y v h thng y dng ng y.

1.9.4. H thng y dng tm tho.

Tm tho dng tho nhng sn phm dng hnh tr trn xoay hay hnh hp ch nht c b dythnh mng. Khun s dng h thng ny, sn phm s khng c du vt cht y nn m boc tnh thm m.


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Hnh 1.51: H thng y dng tm tho.

1.9.5. H thng y dng kh nn.

Hnh 1.52: H thng y dng kh nn kt hp tm tho.

i vi nhng sn phm nh x, chuc nhng lng khun su, khi sn phm ngui th chnkhng trong lng khun v li khun l rt ln nn sn phm kh c th thot khun c. Do ,cn c mt lc y ln v phn b u y sn phm thot khun. Li khuyn l ta nn dng lcthot kh nn kt hp vi tm tho y sn phm.


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Hnh 1.53: Cu to van kh.

Phng n n gin hn, khi ta b tr hai dng kh qua hai van kh trn c hai tm khun y snphm.

Hnh 1.54: Thi kh trn c hai tm khun y sn phm.

Hnh 1.55: Hai kiu van kh thng dng cho h thng thi kh trong hai na khun.

1.9.6. Cc h thng y c bit.

a) Kiu y hai tng loi 1:


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Hnh 1.56: Cht y hai tng kiu 1

Hnh 1.57:1) 2) 3) Qu trnh y cht y hai tng kiu 1.


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2. Kiu y hai tng loi 2:

Hnh 1.58: Cht y hai tng kiu 2.


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Hnh 1.59:1) 2) 3) Qu trnh y ca cht y hai tng kiu 2.


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CHNG II

MY P PHUN V CC THNG S GIA CNG

2.1. Cc kin thc c bn v my phun p.

2.1.1. Cu to chung.


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Hnh 2.1: Cu to chung ca my p phun

2.1.1.1. H thng h tr p phun (injection press support system):

L h thng gip vn hnh my p phun. H thng ny gm 4 h thng con:

Thn my (Frame)

H thng in (Electric system)

H thng thy lc ( Hydraulic system)

H thng lm ngui ( Cooling system)


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Hnh 2.2: H thng h tr p phun.

Cc h thng con trong h thng h tr p phun:

1. Thn my.

Lin kt cc h thng trn my li vi nhau.

2. H thng thy lc.

Cung cp lc ng v m khun, to ra v duy tr lc kp, lm cho trc vt quay vchuyn ng ti lui, to lc cho cht y v s trut ca li mt bn. H thng ny gmbm, van, motor, h thng ng, thng cha du,

Hnh 2.3: H thng thy lc.

3. H thng in.

H thng in cung cp ngun in cho motor v cc h thng iu khin nhit cho khoangcha vt liu nh cc bng nhit( Heater band) v m bo s an ton in cho ngi vnhnh my bng cng tc. H thng ny gm t in (Electric power cabinet) v h thng

dn.


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Hnh 2.4: H thng in.

4. H thng lm ngui.

H thng lm ngui cung cp nc hay dung dch Ethylenglycol lm ngui lngkhun, du thy lc v ngn khng cho nha th cung phu (feed throat) b nng chy. Vkhi nha cung phu b nng chy th phn nha th pha trn kh chy vo khoang cha

liu. Nhit trao i cho du thy lcvaof khong 90-120oF. B iu khin nhit nc(Water temprrature controller) cung cp lng nhit. p sut, dng chy thch hp lm

ngui nha nng trong khun.

Hnh 2.5: H thng lm ngui.


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2.1.1.2. H thng phun.

H thng phun lm nhim v a nha vo khun thng qua cc qu trnh cp nha, nn, khkh, lm chy do nha, phun nha, v nh hnh sn phm. H thng ny gm c cc bphn:

Phu cp liu(Hopper).

Khoang cha liu(berrel).

Cc bng gia nhit( Heaterband).

Trc vt( screw)

B hi t m( Non-returnassembly).

Vi phun( Nozzle).

Hnh 2.6: H thng phun.

Cc b phn chnh trong h thng phun:

1. Phu cp liu:

Cha vt liu nha dng vin cp vo khoang trn.

2. Khoang cha liu:

Cha nha v vt trn di chuyn qua li bn trong n. Khoang trn c gia nhitnh cc bng cp nhit. Nhit xung quanh khoang cha liu cung cp t 20%-30% nhit cn thit lm chy lng vt liu nha.

3. Bng gia nhit:


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Gip duy tr nhit khoang cha liu nha bn trong khoang lun duy tr trngthi chy do. Thng thng, trn mt my p nha c th c nhiu bng gia nhit (>2bng) c ci t vi cc nhit khc nhau to ra cc vng nhit thch hp choqu trnh p phun.

Hnh 2.7: Bng nhit.

4. Trc vt:

C chc nng nn, lm chy do v to p lc c th y nha chy do vo lngkhun.

Trc vt c cu to gm 3 vng c minh ha trong hnh 2.8:

Hnh 2.8: Cu to trc vt.

Vng cp liu (feed section): l vng gn phu cp liu nht, chim khong 50% chiu dihot ng ca trc vt(c ti liu cho l 60%) v c chc nng lm cho vt liu c li thnh


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khi v chuyn vt liu qua vng nn. Chiu su ca cc cnh vt vng ny l ln nht vkhng i.

Vng nn hay vng chuyn tip (Transition compression section): chim khong 25%chiu di hot ng ca trc vt (c ti liu cho l 20%). vng ny, ng knh ngoi catrc vt khng i nhng chiu su cc cnh vt thay i nh dn t vng cp liu n cuivng nh lng. Chnh nh cu to c bit ny m cc cnh vt lm cho nha b nn cht vo

thnh trong ca khoang cha liu, iu ny to ra nhit ma st, nhit ny cung cp khong hn70% lng nhit cn thit lm chy do vt liu.

Vng nh lng ( Metering section): Chim khong 25% chiu di hot ng ca trc vt(c ti liu cho l 20%), c chc nng cung cp nhit vt liu chy do mt cch ngnht v lm bn vt liu chy do vo khun qua cung phun. Chiu su cnh vt vng ny lb nht v hu nh khng i.

nh gi c kh nng lm chy do vt liu ca trc vt l cao hay thp ngi ta

da vo hai thng s chnh l: L/D v Df/Dm T l L/D nh nht l 20:1, t lDf/Dm thng l 3:1; 2,5:1 v 2:1.

5. B hi t m hay van hi t m:

B phn ny gm vng chn hnh nm, u trc vt v seat. Chc nng ny l to radng nha bn vo khun.

Hnh 2.9: B hi t m.

Khi trc vt li v th vng chn hnh nm di chuyn v hng vi phun v cho phpnha chy v pha trc u trc vt. Cn khi trc vt di chuyn v pha trc th vng chnhnh nm s di chuyn v hng phu v ng kiens vi seat khng cho nha chy ngc vsau.


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Hnh 2.10: Cc loi b hi t m.

6. Vi phun:

C chc nng ni khoang trn vi cung phun v phi c hnh dng m bo bt knkhoang trn vo v khun. Nhit vi phun nn c ci t ln hn hoc bng nhit chy ca vt liu(y l li khuyn ca cc nh cung cp vt liu) Trong qu trnh phun nhalng vo khun, vi phun phi thng hng vi bc cung phun v u vi phun nn c lpvi phn lm ca bc cung phun thng qua vi nh v m bo nha khng b phun rangoi v trnh mt p.

Hnh 2.11: V tr vi phun trong h thng phun.

C nhiu loi vi phun khc nhau, ty vo tng trng hp ng dng c th m tadng loi vi phun no cho thch hp. Thng thng ngi ta quan tm n mt s thng snh.


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ng hnh l ca u vi phun phi nh hn l ca bc cung phun mt cht( khong0,125- 0,75) cung phun thot ra ngoi v trnh cn dng.

Chiu di ca vi phun nn di hn chiu su ca bc cung phun( To dng n nh trckhi vo bc cung phun).

cn ty thuc vo vt liu p phun.

Hnh 2.12: Vi phun.

2.1.1.3. H thng kp.

H thng kp c chc nng ng, m khun, to lc kp v gi khun trong qu trnh lm ngui vy sn phm thot khi khun khi kt thc mt chu k p phun. H thng ny bao gm:

Cm y ca my (machine ejection)

Cm km (Clamp Cylinder)

Tm di ng (Moveable platen)

Tm c nh.(Stationary platen)

Nhng thanh ni(Tie bar)


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Hnh 2.13: H thng kp.

Cc b phn trong h thng kp:

1. Cm y (machine ejection).

Gm xilanh thy lc, tm y. v cn y. Chng c chc nng to ra lc y tcng vo tm y trn khun y sn phm ri khi khun.

Hnh 2.14: Cm y.

2. Cm km(Clamp cylinder).


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Thng c hai loi chnh, l loi dng c cu khuu v loi dng cc xi lanh thy lc.H thng ny c chc nng cung cp lc ng m khun v lc gi khun (Kmkhun) ng trong sut qu trnh phun.

Hnh 2.15: Cm km dng c cu khuu.


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Hnh 2.16: Cm km dng xilanh thy lc.

u nhc im ca cm km dng c cu khuu v xilanh thy lc

Loi km u im Nhc im

Km dng c cu khuu Gi thnh thp.

Di chuyn c cu kmnhanh.

T hm gim va p.

Cn bo dng thngxuyn.

Lc km khng tptrung vo gia tmkhun.

Kh hiu chnh.

Km dng xilanh thy lc Lp t khun nhanh.

Bit r p sut km.

D bo dng.

t lm vng tm khun.

Cn lng du thy lcln.

Tn nhiu nng lng.

Chu nh hng bi hs nn ca du.


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Lc km tp trung vo giatm khun.

3. Tm di ng ( Moveable platen).

L mt tm thp ln vi b mt c nhiu l thng vi tm i ng ca khun.

Chnh nh cc l thng ny m cn y c th tc ng lc vo tm y trn khun.Ngoi ra, trn tm di ng cn c cc l ren kp tm di ng ca khun. Tm ny dichuyn ti lui dc theo 4 thanh ni trong qu trnh phun p.

Hnh 2.17: Tm di ng v v tr ca n trn my phun p.

4. Tm c nh(Stationary platen).

Cng l mt tm thp ln c nhiu l thng vi tm c nh ca khun. Ngoi 4 l dnhng v cc l c ren kp tm c nh ca khun tng t nhu tm di ng, tm c


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nh cn c thm l vng nh v nh v tm c nh ca khun v m bo s thnghng gia cn y v cm phun( vi phun vi bc cung phun.

Hnh 2.18: Tm c nh v v tr ca n trn my p phun.

5. Cc thanh ni(Tie bar).

C kh nng co gin chng li p sut phun khi km to lc. Ngoi ra chng cn ctc dng dn hng cho tm di ng.


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Hnh 2.19: V tr cc thanh ni trn my.

2.1.2. Thi gian chu k p v cch rt ngn thi gian chu k.

2.1.2.1 Thi gian chu k p.

Thi gian chu k p l khong thi gian cn thit nha in y lng khun v b dy sn phm

ng c khong 90%. Nh vy thi gian chu k s l tng cc khong thi gian ca tng giai onp phun. Cc khong thi gian ny l

Thi gian phun.

Thi gian gi: gm thi gian nh hnh v thi gian lm lnh.

Thi gian m khun.

Thi gian ng khun: khng ng k c th b qua.

Hnh 2.20: Thi gian chu k.

2.1.2.2 Cch rt ngn thi gian chu k.Thng thng thi gian chu k tng l do{

Nhit ca khun v nhit chy do ca nha do.

Hi thng lm ngui thit k khng tt.

Tn nhiu thi gian trong giai on phun v gi.

Nh vy gim bt thi gian chu k ta s phi gii quyt cc vn sau:

Gim thi gian phun.

Gim thi gian gi.

Gim thi gian lm lnh n mc ti thiu.

Gim thi gian phun:


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Vic ny lin quan n vn mt p sut, s lng khun v b dy sn phm.

Mt p:

Xy ra trn h thng knh dn v ming phun. Mt p t th cc lng khun s in ynhanh hn nn thi gian in y gim v ngc li. Knh dn ln th s lm gim smt p nhng li lm tng thi gian lm lnh i vi knh dn ngui v nh hng n

nhit chy do ca nha trong knh dn nng. Ming phun ln cng lm gim s mtp nhng li li du vt ln trn sn phm.

Nh vy gim thi gian phun ta cn phi thit k h thng phun nha c kch thchp l(Ni k chng 1).

S lng khun:

S lng khun nhiu th thi gian chu k p phun tng nhng trong thit k s lngkhun phi m bo theo yu cu khch hng nn ta khng th gim s lng khun.

Tuy nhien ta c th ci thin thi gian chu k bng cch gim thiu chiu di ca hthng knh dn.

B dy sn phm

Nha s chy d hn trong nhng vng c b dy hn v th ta cn phi thit k b dysn phm mt cch hp l hoc c th b tr thm ming phun khi b dy sn phmqu mng gim thi gian phun/ Mi loi vt liu c chiu di dng chy ca ringn nn ta cn iu chnh p sut phun hp l.

Hnh 2.21: Nha d chy qua vng c b dy ln.

Gim thi gian gi.

ng knh ming phun tng th thi gian gi s tng v th ta c th gim ng knhming phun gim thi gian gi nhng cn phi m bo rng cc lng khun phi c


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in y (xem phn ming phun chng1). Nu khng th gim ng knh ming phunth ta c th ti thiu ha thi gian gi trn my phun p.

Gim thi gian lm lnh.

C hai yu t nh hng n thi gian lm lnh l nhit khun v nhit chy doca nha. Nu mt trong hai yu t ny tng th thi gian lm lnh s tng v thi gian chu k

cng s tng. V vy mun gim thi gian lm lnh ta phi iu chnh nhit ca khun vnhit chy do ca nha mt cch hp l.

Hnh 2.22: Nhit khun t l vi thi gian chu k phun p.

2.2. o v iu khin nhit trong qu trnh phun p.

Nhit ca khun ng vai tr quan trng, nh hng ti:

cht lng sn phm.

Chu k p phun.

co rt, bn v cc khuyt tt trn sn phm.

Do , nhit ca khun cn phi c o v c bin php iu chnh hp l. Hin ti c nhiuloi sonsor v cc ng h o nhit hin th s bn trn th trng. Cc loi ng h ny ch yuo nhit mt ngoi ca khoang cha liu, vi phun v cc b mt ca khun.


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Hnh 2.23: ng h v mt s loi cm bin o nhit.

2.3. Hnh nh mt s loi my p phun.


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CHNG III

GII THIU PHN MM PRO/ENGINEER WILDFIRE 2.0Hin ti, th trng phn mm ha trn th gii rt a dng, vic la chn phn mm no

phc v tt cho cng vic thc s l mt iu kh khn. Tuy nhin, c nm ch tiu cn bit khi

chn phn mm l:

- Tnh linh hot

- Tnh kh thi

- Tnh n gin

- Tnh biu din c

- Tnh kinh t.

Mt trong nhng phn mm c c nhng tnh nng trn nh Catia, Unigraphics NX, I-deas,Pro/Engineer Wildfire.y l bn phn mm c nh gi l rt mnh v rt ni ting tronglnh vc CAD/CAM/CNC. Ty vo th mnh ca mi phn mm m chng c nhng ng dng

chuyn bit: Catia, Unigraphics NX phc v trit cho ngnh cng nghip hng khng, t, tuthy. Pro/Engineer phc v rt tt cho ngnh c kh khun mu (thit k v gia cng) nh khundp, khun rn, khun nha. Pro/E c mt li th l gi r nn chim lnh cc th trng hngtrung v cao.

Hin nay, s ngi s dng Pro/E trn th gii rt nhiu, k c Vit Nam (chim trn 75%) nnchng ta s c c hi hc hi, trao i ln nhau nhng vn lin quan n CAD/CAM vi th giibn ngoi. Do vy, vic chn hc Pro/E l mt hng i tt cho chng ta trc khi vo ngh vcng l cch duy nht chng ta nm bt, ui kp trnh cng ngh ca th gii


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Pro/E l phn mm ca hng Prametric Technology, Corp. Mt phn mm thit k theo tham s,c nhiu tnh nng rt mnh trong lnh vc CAD/CAM/CAE, n mang li cho chng ta cc kh nngnh:

- M hnh ha trc tip vt th rn

- To cc module bng cc khi nim v phn t thit k.

- Thit k thng s.

- S dng c s d liu thng nht.

- C kh nng m phng ng hc, ng lc hc kt cu c kh.(Pro/Engineer Wildfire3.0).

Phn mm Pro/Engineer c cc module sau:

Pro/ASSEMBLY:to iu kin thit lp d dng chi tit vo h thng v di h thng.

N h tr cho phn lp rp v lp rp nhm, gii quyt tnh hung xung t, thit k thayi

Pro/DETAIL:module to trc tip m hnh 3D ca cc bn v thit k chun cho phnxng v ch to trong m bo lin kt 2 pha gia cc bn v v module 3D.

Pro/SHEETMETAL:module h tr thit k nhng chi tit c dng tm, v, v h trcho vic to lp cc chi tit pht trin k c chun b cho chng trnh NC cho sn xut.

Pro/SURFACE:module h tr v, to cc mt t do (Free Form), x l cc mt congv b mt phc tp.

Pro/MANUFACTURING:bao gm d liu NC, m phng, format d liu CL, th vincc phn t.

Pro/MESH:h tr ti to mng li cho vic phn tch phn t hu hn (FEA), xc nhiu kin bin, gn lin vi ANSYS, PATRAN, NASTRAN, ABAQUS, SUPERTAB vCOSMOS/M.

Pro/MECHANICA:M phng ng hc, kim nghim ng sut, chuyn v, bin dngtuyn tnh v phi tuyn, xc nh v d on kh nng ph hy vt liu

Pro/INTERFACE:to iu kin gn vi cc h CAD khc nh: iges, dxf, vdafs, render,SLA

Pro/PROJECT:xc nh iu khin d n thit k v t hp mt s i thit k vlp d n.


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Browser Controls Sash Controls Main Toolbar

Pro/FEATURE:m rng kh nng thit lp nhng phn t thit k bng th vin ca ccb phn, nhm, ti to cc hnh dng chun v di nhm.

Pro/DESIGN: h tr thnh lp m hnh 3D, s khi, xy dng k hoch thit k vmi quan h ph thuc, gip cho s phn tch nhanh v hiu qu v sp xp phng n.

Pro/LIBRARY:module cha th vin rng ln ca cc phn t trn chun (chi tit, phnt thit k tiu chun, dng c, khp ni), c th b sung hoc hiu chnh.

Pro/VIEW:module to iu kin kim tra m hnh ha chi tit v h thng t mthng quan st bt k, phng n, o nh. S dng c ci nhn nhanh tng th t ckt qu hoc mc ch phng nga.

Pro/DRAFT:module h tr biu din 2D, to iu kin c bn v ca cc h CADkhc v b sung module 3D v thit k thng s.

Pro/NLO:module h tr cho cng vic trong mng cc b, ha hp vi cc modulekhc ca h.

Pro/MOLD:module thit k khun.

Pro/DEVELOP (Pro/PROGRAM): module h tr vic lp trnh ng dng ring. Chacc th vin ca hm s C, th vin chng trnh con ca ngn ng lp trnh FORTRAN vc bit tip cn c vi cu trc thit lp cc h thng v cu trc d liu ca h thng.Ngoi ra, Pro/E cn c Pro/CASTING, Pro/LEGACY, Pro/TOOLKIT, Pro/PiPe

Vi nhng tnh nng gii thiu trn cho thy: Pro/Engineer l mt phn mmCAD/CAM/CAE rt mnh, c kh nng m hnh ha cc chi tit phc tp.

3.1. Giao din ngi dng trong pro/engineer wildfire 2.0.

Navigation Tab


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Message Area Browser WindowFeature Creation Toolbar

Graphics Windows

Navigation Windows

3.1.1. Main Toolbar.

y l nhng thanh cng c chnh ca ProE/Engineer vi nhng chc nng c cho trong bng.

tn Toolbar Chc nng


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File Qun l tp tin

Exit Hon chuyn thit k

ViewQuan st trong mi

trng

Model Display Cc dng hin th

Datum DisplayBt tt cc i tng

chun

3.1.2. Feature Creation Toolbar.

y l thanh cng c cha cc lnh thit k thng dng trong Pro/Engineer. Bng sau y xin giithiu mt s chc nng chnh trong mi trng thit k

Base Feature To cc chi tit thit k cs

Engineering

Feature

To cc chi tit theo yu

cu k thut.

Datum Feature To cc chi i tngchun

Edit Feature Cc lnh h tr gip victhit k gim bt thi gian

3.1.3. Navigation Browser.Ca s navigation c bn th.

Model tree: lit k ni dung v trnh t thit k.

Folder Brower: Duyt n cc th mc trong my tnh.

Favorites: Lu cc trang web a thch.

Conections: Kt ni vi dch v v tin ch, cng nh nhm thit k qua internet.


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Th Model Tree Th Folder Browser

3.1.4. Browser Windows.

Th hin nhng ni dung trong la chn ca th Navigation browser.

-Nu trong Navigation browser ta chn Favorites hay Conection th browser Windows s ng vaitr nh mt trnh duyt web.

3.1.5. Graphic Windows.

y l khng gian cha m hnh thit k. trong qu trnh thit k ta c th tng gim kch thc cavng khng gian ny bng cch click vo Sash Control ng tm thi ca s Browser.

3.1.6. Message Area.

Vng khng gian Pro/Engineer dng giao tip vi ngi s dng. Nhng ch dn v thao tctrong qu trnh thit k, nhng thng bo li m ngi dng mc phi, cch khc phc li

.c Pro/Engineer hin th trong vng ny.

3.2. Gii thiu cc lnh dng trong modul pro/design.

1. Cc lnh trong mi trng phc tho sketch.

Mi trng sketch trong Pro/Engineer cng ging nh cc phn mm thit k 3D khc. Trong mitrng ny c y cc cng c phc tho ra m hnh 2D bt k vi nhiu tin ch tr gip.


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Pro/Engineer l phn mm thit k theo tham s nn trong qu trnh dng m hnh sketch quatrng l dng c hnh dng gn ng sau mi to cc rng buc hnh hc cho cc i tngcng nh nhp cc tham s kch thc chnh xc.

Chn i tng hay kt thc lnhLnh ghi kch thcLnh v dng thng, ng tmLnh chnh sa kch thcLnh v hnh ch nhtLnh to rng buc hnh hcLnh v dng trnLnh vit chLnh v cung trnXn i tngLnh bo cung trnLy i xng i tngLnh v ng cong splineHon tt phc thoLnh v imng mi trng phc thoLnh copy cnh c sn

2. Cc lnh trong thit k m hnh 3D.

Pro/Engineer l phn mm rt tin ch trong vic to cc m hnh khi hp. vi y cc cng cdng hnh nh Extrude, revolve,, Variable section sweep tolls l lnh mi c phin bnPro/Engineer 2.0 lnh rt mnh to m hnh dng qut cho php dng hnh qut qua nhiu mtct c hnh dng khc nhau.

Bng sau s cho ta bit tc dng ca mt s lnh c bn trong module thit k.

Tn lnhBiu

tngChc nng

Extrude tooln mt tit din theo phng vung gcvi mt phng cha tit din mt chiucao nht nh.

Revolve toolXy dng vt th trn xoay bng cch quaymt tit din kn theo mt gc quanh mttrc xc nh.

Sweep toolQut mt tit din kn theo mt qu o chotrc.


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Variable section sweep tool Cho php bin thin mt ct dc theo quo qut ch khng c nh nh lnhSweep.

Boundery sweep blend toolLnh ny quan trng nht trong thit k, ns dng xy dng cc b mt t do.cc bmt kh c biu din ton hc.

Hole tool

Lnh dng to l trn cc b mt phng

C cc dng l c nh ngha nh l trn,bc, l c ren, v kt hp gia chng.

Rib tool Lnh dng to gn.

Shell toolLnh dng to dy u cho m hnh thitk. dy ny khng c t giao.

Draft toolLnh to mt nghing gia b mt ny vphp tuyn ca b mt khc.

Round tool Bo trn cc b mt giao nhau.

Chamfer tool Vt mp cc cnh giao nhau.

Sau khi s dng module thit k ti hon thnh sn phm V ng c qutnh hnh:


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3.3. gii thiu modulepro/moldesign

3.3.1.C s chung vtrnh t thit k.

Vic ng dng phn mm Pro/Engineer Wildfire 2.0 thit k khun mu v m phng cc qutrnh lp khun v tch khun to sn phm c ng dng nhiu cc nc cng nghip phttrin nh: M, Php, Canada... Khi s dng phn mm Pro/Engineer Wildfire 2.0 chng ta c thd dng to chi tit mu dng 3D trn module Design. Sau khi thit k xong chi tit mu, phnmm Pro/Engineer Wildfire 2.0 cho php chng ta tnh ton co rt ca vt liu, t ng thit khnh dng lng khun cho chi tit mu v m phng qu trnh tch khun vi chc nng MoldCavity.

Vi nhng c im nh vy, phn mm Pro/Engineer Wildfire 2.0 c th c ng dng thitk khun mu v h tr lp trnh gia cng khun cho cc my cng c CNC khu vc min TrungVit Nam hin nay.Vic s dng phn mm Pro/Engineer Wildfire 2.0 to mu, thit k khun v m phng

Qu trnh tch khun to sn phm c thc hin theo cc bc nh sau:

Thit k sn phm trong module Pro/Design

Add m hinh sn phm vo mi trng thit kkhun.

To phi cho sn phm.


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Thay i kt cu nhng ch cgc thot khun, dy khng

t yu cu.

Phn tch sn phm. Kim tra nghing thotkhun. Chiu dy sn phm.

NO

Xc nh mt phn khun cng nh cc volume phc v vic thn khun.YES

Tch khun, to ra cc tm khun c, khun ci.

Hon thin khu thit k.

T cc tm khun ta to ra cc i tng c qun l di mt file.prt


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Hon thnh lp t cho mt bkhun

Thit k cc l y, ng nc,l dn hng, cc l c ren

bt vt cc tm.

Gia cng chi tit cn chnh xc.trongmodul Pro/CN

M khun v m phng c kim tra va chm.

Thit k v Add cc tm khun: Tm kp trc, tm kp sau, Spaceblock..

Thit k cc cht y, cht dnhng,

Thit k cung phun, ng dn nha, ming phun.


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Vic ng dng phn mm Pro/Engineer Wildfire 2.0 thit k mu v t ng thit k khun liu cn thit khi ch to khun mu, c bit khi p dng cho cc my cng c CNC v:

+ C th kim tra trc hnh dng sn phm di dng 3D.

+ M phng c qu trnh tho lp khun trn mn hnh my tnh.

+ Trnh c trng hp siu nh v trong qu trnh thit k khun.

+ D dng hiu chnh kt cu khun.

+ Gim thi gian thit k, ch to khun mu.

+ a dng ha sn phm trn th trng.

+ Gim gi thnh sn phm.

+ Khai thc ti a hiu qu s dng my CNC.

____________________________________________________________________________

ng dng phn mm Pro/Engineer wildfire 2.0 trong thit k v gia cng khun p nha

chuong 3 co so thiet ke khuon

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