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HC VIN K THUT QUN S
KHOA HNG KHNG V TR
BI GiNG MN HC
H THNG SN XUT LINH HOT
TS. Trn c Tng
B mn CNTB & HKVTin thoi: 0973 991486
Email: [email protected]
TS. Trn c Tng Khoa HKVT
5. Xu hng linh hot ha QTSX
4. M hnh, cu trc ca HTSX
2. Lch s pht trin ca cc HTSX
Ni dung
3. Vai tr ca my tnh trong SX
1. Khi nim cbn v QTSX
Chng 1: Cc khi nim c bn v FMS
6. H thng sn xut linh hot FMS
7. H thng sn xut tch hp CIM
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1. Khi nim c bn v qu trnh SX
Qu trnh sx l qu trnh mcon ngi, bng tr lc v vt lc
ca mnh, thng qua cc cng c sx, tc ng ln i tngsx, thay i cc thuc tnh ca n bin n thnh sn phm,tha mn yu cu tiu dng ca x hi.
- Hot ng sn xut chduy nht c con ngi.
- Trong hot ng sx, con ngi phi vn dng tr lc v vt lc
- Cng c sx l khu trung gian truyn tc ng ca con ngiln i tng. Trnh ca cng c sx phn nh trnh casx: lao ng th cng, cgii ha hay t ng ha.
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- Hiu qu ca sx c gi l cao nu nhvi mt chi ph nhtnh cho sx m nhn c sn phm c gi tr cao, hay nhnc sn phm c gi tr nht nh vi chi ph sx thp.
Vai tr ca cng c sn xut, trnh v tnh cht ca cng csn xut quyt nh trnh v tnh cht ca qu trnh snxut, cn c vo ngi ta phn bit cc dng sn xut.Dng sn xut tin tin hin nay: FMS (Flexible ManufacturingSystems), CIM (Computer Integrated Manufacturing)
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2. Lch s pht trin ca cc HTSX
SX cng nghip tri qua cc giai on:
- SX th cng
- Ckh ha
- T ng ha
- v tip theo lgiai on ca s tch hp cc qu trnh sx t ng.
S tch hp ca cng ngh t ng c bit n vi tn gi SXtch hp my tnh (Computer Integrated Manufacturing-CIM).
S tch hp cho php t chc dng thng tin v vt liu tt hn.Mc ch chnh l loi b bottle-necks, bng vic khai thc tthn kh nng ca nh my. Mt phn ca khi nim CIM l ngdng ca cng ngh sn xut linh hot FMS.
Khi nim v FMS c a ra bi Williamson ti London nm1960s. H thng ny lc u c gi l H thng 24, v nclp hot ng 24h/ngy di s iu khin ca my tnh.
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Lch s pht trin ca cc HTSX
1700s
1800s
1900s
SX th cng
Ckh ha
T ng ha
Transistor, Mch tch hp,My tnh s, My vi tnh
Cc my CNC, robot, my tnh c lp
Networks
S tch hp ca cc phn xng
2000s
Cc t bo SX
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S pht trin ca cng ngh sx
Sc lao ng ca con ngi vng vtNgh th cng
Ckh ha cc nh my u tin
Sn xut hng khi (s lng trung bnh)
Sn xut hng khi (s lng ln)
Bt u pht trin NC (Numerical Control) t ng ha
Bt u pht trin CAD trong NC nh: CNC, DNC
Pht trin CAD, CAM, khi nim v CIM
Cc h thng CIM tin tin: CAD, CAPP, FMS, . . .
Khi nim v CIM lin kt ton cu1997
1990
1980
1970
1955
1950
1930
1900
1750
1600
SX ton cu trn cs CIM lin kt ton cu
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3. Vai tr ca my tnh trong sn xut
My tnh c nh hng rt ln n tt c cc hot ng camt nh my. Trong mt nh my hin i, mi qu trnh, mib phn c tch hp thnh mt h thng di s iu khinca my tnh (CIM).
So vi cng ngh truyn thng CIM c th:- Gim 15-30% gi thnh thit k- Gim 30-60% thi gian ch to chi tit- Tng nng xut 40-70%- Nng cao cht lng sn phm, gim ph liu 20-25%
- Nng cao cht lng thit k Cng da vo s tch hp my tnh vo HTSX, quan nim v
CIM vquan im ng dng CIM cc nc c s khcnhau:
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- Cc nc chu u c kinh nghim v cng ngh truyn thng
v SXLH, ci ng k thut c o to tt,Do vy, ccnc chu u nhn mnh vai tr ca cc h thng SXLH, tchhp kinh nghim qun l, k thut, th lnh ngh vo CIM
- Cc cng ty Nht nhn mnh sn lng, quan tm nhiu sxsn lng sn phm ln trong thi gian ngn. V vy u tins dng cc thit b kh trnh, cc trung tm gia cng linhhot,
- Cc c.ty M quan tm nhiu n tnh n nh ca sx,quan tmn vn ca cc c.ty u tvo thit b, hn ch s dnglao ng r tin. Chnh sch ca M l cung cp thit b vdng c thay cho con ngi trong h thng CIM
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4. M hnh, cu trc ca HTSX
4.1 M hnh sn xut hin i- c trng cbn ca mt nh my hin i l s dng my tnh
trong mi hot ng k thut, sx v kinh doanh: thit k, lp khoch,iu hnh, gim st,iu khin thit b,
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H thng trn gm:
- 3 thit b gia cng, 1 Robot lp rp, 1 trm kim tra
- u vo c mt kho vt liu
- u ra c kho thnh phm
- Mt xe t hnh (AGV) lm nhim v vn chuyn vt liu vbn thnh phm
- H c tch hp vi mt h thng my tnh c ni mng,gip cc cng vic t k thut, k hoch,iu , gim st ntrc tip iu khin cc thit b.
- Phn mm gm c mt h thng CSDL (d liu v phng
php, ch CN, ngun lc cho sx, yu cu v cht lng vs lng sn phm)
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Cc chc nng chnh ca HTSX
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Hot ng ca mi chc nngnhsau:
- Thng tin vo c cha trong b
m (buffer)
- Khi c tn hiu vo h thng gi lnh
start n im quyt nh 1 kch hot h thng,ng thi
gi tn hiu phn hi v trung tm bo thit b sn sng
- Khi thc hin xong,thng tin c gi n im quyt nh 2
kch hot chc nng tip theo
- Thng tin c x l c cha trong b m ra- Qu trnh x l vt liu cng xy ra theo cch tng t
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V d:
- Gi s mt quy trnh gia cng tin
v vt liu th c a n u
vo buffer.
- H thng gi mt tn hiu start ti
im quyt nh 1
- Mt tn hiu phn hi t my cng c bo my sn sngcho gia cng
- Phi c gi sang my gia cng
- Khi gia cng hon tt, mt tn hiu c to im quyt nh2 bo cho h thng l chi tit c gia cng xong.
- Thng tin ny c s dng chuyn chi tit ra buffer ura.
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4.2 Cc thnh phn ca CIM
CAD: s dng my tnh trgip cng vic thit k, tnh
ton k thut
CAPP: s dng my tnh trongvic thit k qu trnh cngngh ch to sn phm (chunb cng ngh)
CAM: s dng my tr giptrong qu trnh sx: to chngtrnh gia cng,iu khin hthng sx, h thng m bovt tthit b
CAQ: s dng my tnh trong
cng tc m bo, qun l chtlng sn phm
PP&C: bao gm kha cnh t chc caCIM, nhk hoch ha ngun lc
(MRPI), k hoch ha cung ng vt t(MRPII), k hoch tin , x l nhng,iu hnh sx.
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4.3 Cu trc theo chc nng ca HTSX
Xt theo chc nng, cc thnh phn ca mt HTSX c th cchia thnh 2 nhm:
- Nhm t chc sn xut, gm cc chc nng:
Nhn, lp k hoch thc hin viu khin sx theo n hng. MtCSDL trung tm cha d liu v s l n hng, cc know-howcng ngh
- Nhm k thut v sn xut, c cc chc nng: pht trin snphm, thit k, cng ngh, v.v
- Hai nhm ny c lin h mt thit vi nhau m bo cc chtiukinh t, k thut ca c qu trnh.
- Vng logistics biu din hng dch chuyn ca lung thng tin vvt liu trong sx theo kha cnh kinh t-t chc sx (theo phngngang) v k thut-sx (theo phng dc)
- Vng kim sot cht lng biu din chc nng kim sot chtlng trong qu trnh thit k v sx.
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Cu trc theo chc nng ca HTSX
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4.4 Cu trc theo th bc ca HTSX
HTSX, kinh doanhcu doanh nghipc b tr theoth bc.
Cao nht l xnghip.
Tip theo l cccp: sx, phnxng, thit b.
Mi cp c hthng my tnhring v gia cccp l h thngmng truynthng
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Cu trc theo th bc ca HTSX
Cp x nghip: tp trung cc chc nng
- Pht trin sn phm (thit k, chun b cng ngh, lp khoch cht lng sn phm)
- K hoch sx (lp danh mc sn phm, k hoch cung ng,.)
- Kinh doanh (hch ton, tiu th sn phm,)
- cp ny my tnh s l lng thng tin ln trong cc CSDLtrung tm. Mng my tnh c t chc theo din rng (WideArea Network-WAN).
Cp sn xut: thc hin mi cng vic trc tip to ra snphm.
- Cc nhu cu v thit b chnh (my cng c, t bo sx,); thitb vn chuyn v dng c c xc nh v gim st
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- Cc my tnh m bo chc nng qun l khu vc viukhin ton b cc h thng thit b sx v l my ch trong ccmng cc b ca cc phn xng.
- QTSX c chia nh, thc hin ni tip hoc song song vphn phi cho cc phn xng.
Cp phn xng:- m bo gim st viu khin sx trong cc phn xng
ring bit.- Thng tin cp ny c x l theo thi gian thc.
Cp iu khin thit b:- C chc nng gim st viu khin cc thit b ring l- Cc my tnh l cc microcomputer, cung cp chng trnh
hoc cc thng s cng ngh
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5. Xu hng linh hot ha QTSX
5.1 Cc dng t chc SXCc HTSX hin i c th c phn thnh 5 dng, ty theo
tnh linh hot ca chng
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My CNC:- L thit b linh hot nht. Khi cn thay i sn phm chcn
t cc tham s ca phi, thay dao v np chng trnh mi.- Vi cc tin ch lp trnh ngy cng phong ph, cc cng c
tr gip lp trnh CAD/CAM, to cho my CNC c kh nngthch ng rt linh hot vi s thay i sn phm.
T bo sx- L mt nhm thit b, gm vi my CNC hoc mt vi trung
tm gia cng CNC, c nhim v gia cng mt nhm sn phmnht nh.- Cc trung tm gia cng thng c nhiu trc, c cc h thng
cp phi v thay dao t ng nn c th gia cng cc chi titphc tp, nng sut cao, t i hi s can thip ca con ngi.
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V d: trung tm gia cng CNC 5-trc
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H thng sn xut linh hot
- Gm c mt s my CNC c b tr theo trnh t cng nghv lin kt vi nhau bng cc thit b vn chuyn.
- Ngoi cc thit b ging nht bo sx, trong FMS cn c mytnh trung tm iu phi hot ng ca ton h thng.
- Nu mt FMS c kh nng ng thi gia cng mt nhm(batch) sn phm th ncn c gi l dy chuyn nhm.
Dy chuyn sx
- L dng t chc sx cng nht.
- Gm cc thit b (ch yu l chuyn dng),c b tr chtch theo tin trnh cng ngh, lin kt vi nhau bng 1 hthng thit b vn chuyn lin hon.
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- Cc nguyn cng cng ngh c thit k cht ch khng chtheo ni dung m c theo thi gian,m bo nhp sx.
- Dy chuyn sx cho nng xut cao, cht lng sn phm nnh
- Tuy nhin n khng c kh nng thch ng vi s thay i casn phm. Khi thay i sn phm th phi thit k, lp t lidy chuyn
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5.2 Nhu cu p dng SXLH
- Dy chuyn cng tuy m bo cht lng tt v gi thnhthp nhng khng p ng c nhu cu ca th trng. Doth hiu ca ngi tiu dng thay i nhanh, khin cho chu ktn ti ca sn phm ngn i. Ngha l s loi sn phm tngv s lng mi loi gim.
- Do vy, nhu cu v dng sn xut linh hot ngy cng tng.
Tnh kinh t- Gim thi gian chun b mi khi chuyn sang loi sn phm
mi
- Nng sut gia cng cao nh gim thiu thi gian my- Gim chi phlng cng nhn do khng i hi tay ngh cao.
Cht lng sn phmc m bo bi- Cng ngh n nh- T ng ha gia cng v lp rp
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- T ng ha vn chuyn v cung cp vt liu- T ng ha kim tra cht lng gia cc giai on- S dng cc dng c, g tiu chun- Hn ch cc cng vic i hi s can thip trc tip ca con
ngi
Tnh linh hot- H thng c th p ng cc n hng nhanh vi s lng
khc nhau.- H thng d dng thch ng vi s thay i phng n sn
phm v nhng yu cu ca khch hng mi hi t s thayi g, dng c, chng trnh
- H thng d dng nng cp p ng s tng sn phm hocthay i cng ngh.
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6. HTSX linh hot (FMS)
6.1 M t vnh ngha v FMS
nh ngha v FMS tng i phong ph v trong nhiu khacnh n ph thuc vo quan im ca ngi s dng, nh:FMS bao gm ci g v n s c s dng nhth no?
- FMS gm mt lot cc my cng c t ng hay cc thit b sxkt ni cng nhau cng vi mt h thng vn chuyn vt liu,h thng my tnh iu khin
- FMS gm mt nhm my NC c th sn xut mt nhm sn
phm, c h thng cp vt liu t ng v my tnh iu khintrung tm cn bng vic khai thc ngun lc, gip h thng cth thch nghi t ng vi s thay i cc chi tit sx v khilng sn phm
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- FMS l mt h thng t ng da trn cng ngh nhm, linkt vi iu khin tch hp my tnh v mt nhm my sx
v vn chuyn cc chi tit t ng cho vic gia cng lin hon.
- Mt cng ngh gip cc nh my t c thi gian yu cu
ca khch hng tt hn, gi thnh sn phm thp hn, v cht
lng cao hn do s pht trin qun l viu khin ngun
lc
- Theo quan im t ng ha: Mt h thng sx linh hot l mt
dng ca t ng ha linh hot trong mt s my cng c
c lin kt cng nhau bi h thng vn chuyn vt liu, v
tt c cc b phn ca h thng c iu khin bi mt my
tnh trung tm
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- Da trn quan im v my cng c: mt nhm t bo sx linkt bi mt h thng vn chuyn vt liu v mt my tnh trungtm c gi l mt h thng sx linh hot. Vic kt hp viu khin my tnh lm cho cc sn phm c sx vi githnh c khi chsx vi khi lng nh
Mt h thng FMS tht s c kh nng x l vi nhiu chngloi sn phm khc nhau, khi cn thit c th sn xut bt kmt sn phm no trong s chng, khng theo th t.
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p ng yu cu trn, FMS cn c mt s kiu linh hot:
N cn linh hot p ng s thay i v khi lng sx vs thay i sn phm, nhn cc sn phm mi, v thch ngvi s thay i v cng ngh v thit k.
FMS cng i hi s linh hot trong vic x l cc tnh hungkhng c d bo trc nhvn thi gian hng my,thay i k hoch t xut, kh nng pht trin khi m rng hthng.
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6.2 Cu trc ca FMS
V c bn, FMS c to bi cc phn t phn cng v phnmm
- Cc phn t phn cng l xc thc v c th nhn thy c,nhcc my CNC, thit b vn chuyn vt liu (robot hay xe thnh), h thng dao c, my o ta , trm lm sch chi tit,thit b phn cng my tnh.
- Cc phn t phn mm khng hin hu v s c, nhccchng trnh NC, phn mm qun l v s lu thng, thng tinv dao, file th t lm vic ca my CMM,
Theo cu trc th FMS l mt t hp ca t bo gia cng tng v t bo kim tra t ng,c lin kt vi nhau thnhmt h thng nht, theo dng vt liu vi s tr gip ca h
thng vn chuyn phi t ng viu khin nh mng mytnh
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6.3 Phn loi FMS
Da vo kinh nghim ng dng FMS cc nc ngi taphn FMS ra 3 loi:
Loi 1: khng ph thuc vo dng vt liu ca t bo gia cngt ng (ng ngha vi m un t ng)
- Loi ny c cu to t cc my vn nng vi iu khintheo chng trnh s, cho php lin kt vi my tnh iukhin.
- FMS loi 1c s dng trong nhng trng hp m chi titc thi gian gia cng ln (qu trnh gia cng c tp trungtrn mt my)
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Loi 2: Gm cc t bo gia cng t ng vn nng c iukhin t mng my tnh v h thng vn chuyn phi t ng.
- Trong FMS loi 2 cc chi tit cng loi c th c gia cngtheo nhiu tin trnh cng ngh khc nhau trn mt t bo giacng t ng (m un sx t ng).
- FMS loi 2c s dng rng ri trong nhng trng hp khichi tit c thi gian gia cng khng ln
Loi 3: l dy chuyn t ng linh hot. Trong FMS loi nymi nguyn cng c thc hin chtrn mt my
- H thng vn chuyn phi m bo tin trnh cng cho mi chi
tit vthng thng nc thc hin di dng bng tihay my qua vng.
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Ngoi ra ngi ta cn phn kiu FMS ra:
- FMS tun t: sx tng lot chi tit sau lp k hoch vchun b cho sx lot tip theo (ging nhdy chuyn sx linhhot lot nh)
- FMS ngu nhin: SX bt k mt chi tit no mt thi gian.
- FMS m un: cho php ngi s dng m rng ra cc loitrn.
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6.4 S cn thit ca FMS
Mc tiu chnh trong sx l my nhn c vt liu hoc chi titng thi gian. Qu nhiu hoc qu sm to s ng. Qu
t hoc qu chm gy ra s chm tr tin v my khnghot ng. Kt qu trong nhiu trng hp l s dng khnght kh nng khai thc ca thit b.
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Gii php FMS
FMS gip qun l viu khin cc nhn t kh kim sottrong khi vn p ng yu cu ca khch hng bng cch:
Nng cao iu khin sn xut qua:
- Gim s thay i kh kim sot
- Trang b cc phng tin nhn bit v s l nhanh vinhng sai lch trong k hoch sn xut
- Gim s ph thuc vo con ngi
Gim lao ng trc tip qua:
- Gim s vn hnh ca cng nhn
- Loi b s ph thuc vo k nng ca th my
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Nng cao vic sl vi
- Nhng thay i v k thut- Thi gian dng my- Li dao- Vn chuyn vn liu chm
Nng cao s thch nghi qua s ng b ha nhanh v d dngvi khi lng sn phm thay i, v thm sn phm mi
Tng kh nng khai thc my qua vic loi b thi gian setupmy, khai thc cc tnh nng t ng thay th s can thipbng tay
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6.4 ng dng ca FMS
FMS c p chnh trong cc lnh vc sn xut sau:
- Gia cng ct kim loi- To hnh kim loi
- Lp rp
- Hn
- X l b mt
- Kim tra
- Kim nghim
Trong
cng ngh FMS
c s
d
ng ph
bin nh
t ltrong gia cng ct kim loi
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7. HTSX tch hp (CIM)
7.1 Cc nh ngha v CIM
CIM l gii php ng dng cc my tnh v mng lin kt chuyncc cng ngh ring l thnh cc h thng sx tch hp trnh cao. C nhiu nh ngha v CIM, ty thuc vo mc ch ng dngca n:
- Theo hi ca nhng nh sx- SME (Society of ManufacturingEngineers): CIM l mt h thng tch hp c kh nng cung cp str gip ca my tnh cho tt c cc chc nng thng mi, baogm cc hot ng t khu tip nhn n hng cho n cung cpsn phm ca mt nh my sx.
- Theo t in cng ngh tin tin: CIM l mt nh my t ng haton phn, ni m tt c cc qu trnh sx c tch hp vciu khin ca my tnh.
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- Theo nh ngha ca cng ty my tnh IBM: CIM l mt ngdng, c kh nng cung cp cs nhn thc cho vic tchhp dng thng tin ca thit k sn phm, ca k hoch sx,ca vic thit lp viu khin cc nguyn cng
- Theo hng SEMENS: CIM khng phi l mt sn phm honthin m l mt chin lc v l mt khi nim t cc mcch th trng ca mt nh my.
Mc ch ca CIM ltng li nhun ca nhsx. tng linhun cc nh sx phi ko ngng nng cao nng sut v chtlng sn phm,ng thi phi tng tnh linh hot ca HTSX
nh cng ngh tin tin ca CIM.
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CIM cu im:- Tnh linh hot ca sn phm v ca sn lng- Nng cao nng sut v cht lng gia cng- Hon thin giao din gia thit k v sx- Gim lao ng trc tip vlao ng gin tip- Thit k cnng sut v chnh xc cao- Tiu chun ha cao- Tit kim thi gian v mt bng sx
- To cs d liu chung loi tr cc b phn cha d liuc lp.- Loi tr cc cng vic lp li khng cn thit- Gim thi gian gim st sx v s cn b thc hin cng vic
ny
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7.2 Cc thnh phn ca CIM
TS. Trn c Tng Khoa HKVT
Phm vi ca CAD/CAM v CIM
CIM bao gm tt c ccchc nng cng ngh caCAD/CAM cng nhhotng kinh doanh ca cngty.
Mt h thng CIM l tngthng p dng cng nghmy tnh vo tt c cchot ng sn xut v x
l thng tin trong sn xut,t nhn n hng, thit kv sn xut n vnchuyn hng ha v h trsau bn hng.
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Cc phn t t ng ha ca h CIM
TS. Trn c Tng Khoa HKVT
7.3 Xu hng pht trin ca CIM
C2 hng tip cn CIM: tip cn trn xung (top - down)hoc di ln (bottom-up)
Tip cn trn xung
u im:
- Cu trc h thng (cc loi m un, quan h th bc gia ccm un v dng thng tin qua chng) c th c xc nhmt cch cht ch
- S dng tt hn cc phn mm tiu chun
- Vic thit lp cc m un theo th bc t trn xung lm chovic kim tra tng cp mt cch d dng (nh m phng)trc khi chuyn xung cp sau
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Nhc im:
- Thng cc m un c mua t bn ngoi nn c th kohon ton ph hp vi trnh qun l v sx hin ti
- Gy khkhn cho vic nng cp trong tng lai
Tip cn di ln
u im:
- Cc m un c th xy dng ng thi v vn hnh c lpvi nhau, v vy thi gian c th c rt ngn
- Nu iu kin ti chnh khng cho php th c th hin i hatng phn ca h thng.
Nhc im:- Khm bo s ng b ca phn cng v phn mm
TS. Trn c Tng Khoa HKVT
Cng c th tip cn CIM t cc nhn t ring bit:
- Xut pht tCAM: do cc nh cng ngh tin hnh, nhm tng ha qu trnh sx, vn chuyn, kho tng, kim tra
- Xut pht tPP&C(Production Planning & Control): Gii phpny xut pht t pha t chc vi mc tiu ci thin cng tck hoch ha,iu sx, ci thin cc chtiu kinh t: gim
th
i gian chun b
sx, ho
ch
nh h
p l lo
t s
n ph
m, gi
mchu k sx v sn phm tn trong phn xng.
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- Xut pht tCAD/CAM: l s ng dng ng b cc phn
h CAD, CAM, CAQ. Gii php ny khc phc tnh trng mtng b, trng lp cc yu t k thut.
- Gii php CIM: l kt hp gia CAD/CAM v PP&C, c th btu bng tch hp cc cng on c t ng ha vimng truyn thng vc s d liu trung tm.
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