giao trinh ugs

1.

Bi 1trong NX

Cc thao tc chn

A. Cc phng php la chn hnh hc: Cc phng thc la chn trong NX rt a dng v tin dng cho ngi s dng.Khi la chn th con tr s hin th nh hnh . Sau y l mt s phng php la chn c bn : 1. La chn Feature : Ta c th la chn chi tit bng cch click chut v cc biu tng trn thanh cng c sau :

Ngoii ra ta cng c th la chn cc i tng mt cch d dng nh v b lc la chn. V d ta mun chn cc cnh ta c th chn Edge trong hnh sau :

2. Phng php la chn tng qut : Chn select all la chn tan b vt th.

Nu mun chn mt i tng no , ta c th r chut li gn i tng cho n khi i tng chuyn sang mu hng i vi cc i tng b che khut ta c th chn chng bng cch : chuyn cch hin th chi tit sang dngWireframe with Hidden Edges (nhp v biu tng ), hoc ta c th hin th cc i tng b khut bng cch nhp v biu tng Highlight Hidden Edges sau :

Mt cch khc la chn chnh xc cc i tng l dng cng c QuickPick. Cch tin hnh nh sau : ta r chut li gn chi tit, ch thi gian khong 2 giy ta s thy con tr hin ln nh hnh bn, click chut tri, ta s thy hp thoi QuickPick. Trong hp thoi QuickPick, cc i tng s c phn thnh cc nhm nh : All objects, Features, Body Objects v cc i tng s c highlight khi ta r chut ln cc tn i tng trong QuickPick. Ta chn i tng bng cch click tri chut.

3. Cc tng thch cho ngi dng (User Preferences) : Chn Preferences trn Menu bar. User Preferences c dng nh ngha cc thng s hin th nh tn chi tit, cch b tr (layouts), views Ngoii ra ta c th thit lp cho cc layer, mu, font cho cc chi tit. a. Giao din ngi dng (User Interface) Chn Preferences\User Interface. User Interface cho php ta ty chnh cch NX lm vic v tng tc vi cc c tnh do ta thit lp. Chng hn nh ta c th thay i v tr, kch thc hoc trng thi hin th ca ca s chnh, vng ha, hoc ca s hin th thng tin. General Tab : thit lp mc chnh xc hin th trong ca s thng tin. Layout Tab : thit lp v tr ca Resource bar. Macro Tab : thit lp khong thi gian cho mt m phng chuyn ng.

b. Visualization : Chn Preferences\Visualization. B. Thit lp Object Display : Object display c dng thay i cc thit lp nh mu, font, layer, trng thi hin th ca cc i tng. Click Preferences\ Object : ca s Object Preferences xut hin nh hnh bn. Trong ta c th ty chnh work layer, color, translucency cch th hai l ta click phi chut v in m trong Part Navigator, chn Edit Display. Ngi ra ta cng c th ng dng cc ty chnh ny cho tng i tng nh cc ng, cc mt

C. Cc trnh ng dng : Ta c th m cc trnh ng dng bng cch chn START trn thanh Standard Toolbar. Mt

khc ta c th chn cc ng dng khc t drop-down menu nh hnh bn. V d ta c th la chn phn Modeling, Drafting, Assembly Mc nh ca trnh ng dng l Modeling khi ta to mt file mi.

thay i ni dung bi: neverlose, 21-08-2010 lc 11:23 PM

http://my.opera.com/phuochaivn/blog/ each second count! YM: phuochai_qnTrch Dn

2.3.

Nhng ngi CM N neverlose v bi vit hu ch:vantutn (21-08-2010)22-08-2010 12:02 AM#3

neverlose

we only here today

nev erlose's Av atar

Tham gia ngy Oct 2009 n t tp. HCM Bi gi 850 Cm n : 569 c cm n 1,059 ln 420 bi

: Bi tp v phn modeling v assembly - theo NX5 for designer

Bi 2 CC FEATURE THNGDNG

1.1.NH NGHA : Features l cc phn t c nh ngha nh l cc hnh c bn, ng, mt, hay cc hnh khi. V d mt s feature thng dng nh : blocks (khi), cylinder (hnh tr), cones (hnh

cn) , spheres(hnh cu), extruded bodies (cc khi c to ra ko di), v revolved bodies (cc khi c to ra bng cch xoay trn).

1.2.CC KIU FEARURE : C 6 kiu feature : Reference features, Swept features, Remove features, Userdefined features, Extract features and Primitives. Cc kiu feature ny c cha trong menu Insert.

Click Insert chn la kiu feature.

Cc lnh thc thi ca Form Features c cha trong cc menu c nh du mu hnh trn. Cc biu tng ca Form Features cng c hin th trn thanh Formm Features Toolbar nh hnh di. Trn c cc lnh thc thi m bn thng xuyn s dng. Ngoi ra ta c th chn thm cc lnh khc vo bng cch click vo ADD OR REMOVE BUTTONS/ FORM FEATURE.

REFERENCE FEATURES : cho php ta thit lp cc mt tham kho, cc ng tham kho. Cc i tng tham kho ny h tr vic dng cc mt tr, mt cn, mt cu, cc vt trn xoay. Click vo INSERT DATUM/POINT m cc la chn khc ca Reference Feature : Datum Plane, Datum Axis, Datum CSYS, v Point SWEPT FEATURES : cho php ta dng cc hnh bng cch ko di hoc xoay trn mt i tng ban u. Swept Feature bao gm : Extruded Body Revolved Body Sweep along Guide Tube Styled Sweep Lnh thc thi : INSERT DESIGN FEATURE : dng cho extrude (ko di) hay Revolve (xoay trn). INSERT SWEEP : dng cho cc lnh cn li. REMOVE FEATURES : cho php to ra m hnh bng cch ct b i mt phn no ca hnh ban u.

Lnh thc thi : INSERT DESIGN FEATURE Remove Features bao gm : Hole (to l) Boss (to phn tr li trn mt phng) Pocket (to ti) Pad Slot (khe) Groove (rnh)

C th chn bng cch click chut vo cc icons sau : USER-DEFINED FEATURES : (kiu feature do ngi dng nh ngha cho php ngi dng nh ngha features mu ca mnh.

Lnh thc thi : INSERT DESIGN FEATURE USER DEFINED EXTRACT FEATURES : cho php to ra cc khi bng cch xut ra cc curve (ng cong), faces hoc l cc vng. Extract features bao gm : Extract Sheet from curves Bounded plane Thicken Sheet Sheet to Solid Assistant Lnh thc thi : INSERT ASSOCIATIVE COPY EXTRACT : dng cho ty chn extract.

ang chnh........thay i ni dung bi: neverlose, 22-08-2010 lc 12:31 AM


4.

22-08-2010 12:33 AM#4

neverlose

we only here today




Gc ta , chiu di cc cnh Chiu cao, hai im Hai im trn ng cho khi Chn Origin, Edge lengths by gi ta xc nh gc ta bng cch dng Point Constructor. Click vo biu tng POINT CONSTRUCTOR trn thanh Utility

Hp thoi Point Constructor xut hin. Mc nh XC, YC, ZC l 0. Cick OK Hp thoi Block xut hin. Ta xc nh cc thng s hnh hc nh sau : Length (XC) = 65 inches Width (YC) = 85 inches Height (ZC) = 20 inches Click OK xem ton b vt th: right-click chn Fit hoc nhn + F Right click chn ORIENT VIEW TRIMETRIC

Kt qu l ta s nhn c mt khi nh hnh v sau :

1.1.1.TO MT TRC (SHAFT) :

To mt trc vi hai phn hnh tr (cylinders) v 1 phn hnh cn (cone) ni li vi nhau nh hnh v :

To file mi vi tn Impeller_shaft.prt (n v Inch) Chn INSERT DESIGN FEATURE CYLINDER hoc nhp vo biu tng C 2 cch dng mt tr : Axis, Diameter, Height (trc , ng knh, chiu cao) Arc, Height (cung trn, chiu cao) Chn AXIS, DIAMETER, HEIGHT

Sau chn Vector Constructor gn biu tng Specify Vector

Click ZC chn chiu dng hnh theo dc trc Z. Click OK Tip theo, click vo biu tng Point Constructor k bn Specify Point thit lp gc ta cho cylinder. Thit lp cc ta XC, YC, ZC l 0 (trng

vi gc ta WCS) Nhp cc thng s vo ca s tip theo nh sau : Diameter = 4 inches Height = 18 inches Click OK, CANCEL Right-click v chn ORIENT VIEW ISOMETRIC to ra mt khi tr c nh hnh v sau :

Tip theo ta s to hnh cn phn cui ca hnh tr. Chn INSERT DESIGN FEATURE CONE hoc click vo biu tng

C nhiu cch to mt khi hnh cone : Diameters, Height (ng knh, chiu cao) Diameters, Half Angle (ng knh, gc cone) Base Diameter, Height, Half Angle (ng knh y, chiu cao, gc cone) Top Diameter, Height, Half Angle(ng knh nh, chiu cao, gc cone) Two Coaxial Arcs (2 cung trn ng trc) Chn DIAMETERS, HEIGHT

Trong hp thoi VECTOR ta chn Z-Axis, chiu vector theo chiu dng ca trc Z. Click OK Trong hp thoi CONE ta nhp cc thng s nh sau : Base diameter = 4 inches Top Diameter = 6 inches

Height = 10 inches Click OK

Ca s Point Constructor xut hin, ta chn biu tng Arc/Ellipse/Sphere Center hoc click vo biu tng , sau chn mt trn ca hnh tr va to lc ny. Hoc ta cng c th nhp cc ta nh sau : XC = 0 YC = 0 ZC = 18 Click OK Trn ca s BOOLEAN OPERATION, chn UNITE (NI). Phn hnh cone s c ni vo phn u ca hnh tr.

thay i ni dung bi: neverlose, 22-08-2010 lc 12:58 AM


5.

22-08-2010 01:04 AM#5

neverlose

we only here today




Click Cancel trn tt c cc ca s, kt qu ta s nhn c hnh v nh sau :

Click + F hin th ton b m hnh va v. Tip theo, chng ta s to mt phn hnh tr ni tip vo phn hnh cone va v. Lp li cc bc nh cch dng phn hnh tr u tin. Kch thc : diameter = 6 inches, height =

20 inches. M hnh nhn c s ging nh hnh sau :

1.1.REFERENCE FEATURES (CC FEATURE THAM CHIU) 1.1.1.DATUM PLANE (MT CHUN) : Cc mt chun (datum plane) l cc feature tham chiu h tr vic dng cc feature khc nh cylinder, cone, sphere, v cc m hnh trn xoay hoc to ra cc feature t nhiu gc khc nhau . Sau y,ta s to ra mt Datum Plane t mt mt cho trc. C nhiu cch to Datum Plane :

M Arborpress_plate.prt Chn INSERT DATUM/POINT DATUM PLANE. Cch khc l click vo biu tng Datum Plane trn thanh cng c FORM FEATURE

Hp thoi Datum Plane xut hin nh hnh v. Ta c nhiu la chn to Datum Plane nhng cc phin bn NX sau ny thng minh t la chn phng php thch hp, ty thuc vo i tng m ta chn nu ta chn kiu Infered (NX cng mc nh kiu ny)

Click mt trn ca khi hnh hp. Chiu vector to Datum Plane s hng ra. Do nu ta chn mt y to Datum Plane th chiu ca vector s hng xung. Nhp thng s cho OFFSET DISTANCE (khong cch t mt Datum Plane n mt ta chn) l 15 inches. ClickAPPLY. Ta c hnh sau :

Click CANCEL 1.1.2.DATUM AXIS (TRC THAM CHIU) : Trong phn ny ta hc cch to ra trc tham chiu Datum Axis. Datum Axis l mt feature tham kho c dng dng cc feature

khc nh Datum Plane, feature trn xoay hoc ko di ... Datum Axis khng to ra cc rng buc hnh hc vi cc i tng khc cng nh cc trc ta khc. Chn INSERT DATUM/POINT DATUM AXIS . Cch khc l nhp vo biu tng trong thanh From Feature nh hnh sau :

C nhiu phng php to ra Datum Axis. Cng ging nh cch dng Datum Plane, NX c kh nng la chn cch dng Datum Axis ty thuc vo i tng m ta chn (mc nh cng l Infered).

Chn TWO POINTS hoc biu tng ca n t ca s Datum Axis

Chn hai im trn khi nh trong hnh :

Click OK ta c ng cho nh hnh v, l Datum Axis.

1.2.SWEPT FEATURES (cc feature c to ra bng cch qut theo mt bin dng cho trc) : 1.2.1.EXTRUDED BODY : cho php ta v cc vt dng tm hoc khi c bng cch qut mt bin dng hnh hc theo mt phng vi khong cch xc nh. Sau y ta s lm mt

v d v cch to mt khi ch nht bng phng php trn. To v lu mt file mi vi tn Arborpress_rack.prt Right-click, chn ORIENT VIEW ISOMETRIC . Trc khi to ra khi ch nht ta cn v bin dng ca hnh ch nht, n s l nn ta dng nn khi ch nht. Chn INSERT CURVE LINE . Hoc c th chn biu tngthay i ni dung bi: neverlose, 22-08-2010 lc 01:12 AM

trn thanh toolbar.


6.

22-08-2010 01:24 AM#6

neverlose

we only here today


Tham gia ngy Oct 2009 n t tp. HCM Bi gi

850 Cm n : 569 c cm n 1,059 ln 420 bi


Hp thoi Line xut hin nh hnh v :

Di phn START POINT chn biu tng POINT CONSTRUCTOR Thit lp ta XC = 0, YC = 0, ZC = 0 v click OK. Ca s mi c m ra cho php ta xc nh im u v im cui ca on thng. Click biu tng POINT CONSTRUCTOR di END POINT v nhp vo ta XC = 0, YC = 25, ZC = 0 Click OK, sau click APPLY. Tip tc lp li cc bc trn to thnh

hnh ch nht. ta cc nh c cho nh sau :

Click OK sau mi ln nhp ta Click CANCEL sau khi tt c cc im c nhp ta . Ta s c mt hnh ch nht trng nh hnh sau

By gi ta s thc hin bc extrude to khi ch nht. Chn INSERT DESIGN FEATURE

EXTRUDE hoc click vo biu tng Hp thoi EXTRUDE xut hin, ta chn ln lt 4 cnh hnh ch nht theo th t hnh trn. Sau nhp vo cc thng s sau : START = 0, END = 20. Click OK

Ta c khi ch nht nh hnh sau :

1.1.REMOVE FEATURES (cc feature c to thnh bng cch ct b mt hay nhiu phn ca i tng ban u) : Hole : to cc l n gin, counter-bored, countersunk trong mt khi c. Boss : to mt khi tr n nh trn mt mt phng hoc mt tham chiu. Pocket : to phn rng bn trong khi c. Phn rng c th l hnh tr hoc hnh hp ch nht. Pad : to khi hnh ch nht trn mt b mt khi hin hnh. Slot : to ra ng rnh vo bn trong hoc xuyn qua khi hin hnh. Hnh dng ca ng rnh c th l ch T, U, Ball hoc

Dovetail. Groove : to rnh trn phn trn xoay Thread : to ren trn b mt tr ca mt khi c. By gi ta lm v d v cch to cc l (hole) M file Arborpress_plate.prt Chn INSERT DESIGN FEATURES HOLE hoc click vo biu tng Form Feature Toolbar. trn thanh

Trong ca s Hole ta nhp cc thng s sau : Diameter = 8 inches Depth = 25 inches Tip Angle = 118 degrees Chn mt trn ca khi hin hnh. Click OK

Ca s tip theo cho php ta xc nh v tr ca l.

Chn PERPENDICULAR t hp thoi Positioning u tin ta click chn cnh nh hnh bn di. Nhp thng s Distance = 10 in vo khung Current Expression Chn APPLY

Lm tng t cho cnh cn li vi Distance = 11,25 in Click OK ta c hnh sau.

Lp li cc bc trn to 5 l vi cc ta cho nh sau.

Cui cng ta c hnh nh sau.



7.

22-08-2010 01:34 AM#7

neverlose

we only here today




Bi 3CC THAO TC VI FEATUREFeature Operations l phn tip theo ca Form features. Trong chng ny chng ta s tm hiu cc chc nng s c ng dng vo cc mt hoc cc ng ca khi c hoc l feature m ta va to ra. Cc chc nng ny bao gm : taper, edge blend, face blend, chamfer, trim 3.1.KHI QUT : Feature operations c thc hin da trn form features lm smooth cc gc, to ra cc mt vt cone, lin kt hoc ct b cc khi ph to ra hnh v mong mun. V d mt s feature operations :

Sau y chng ta s tm hiu cc lnh ca feature operations v cng dng ca chng. 1.2.CC KIU FEATURE OPERATIONS : Cc feature operations trong NX bao gm : Edge blend, Face blend, Soft blend, Chamfer, Hollow, Instance, Sew, and Patch. Sau y ta s tm hiu chi tit cc lnh : Edge blend : dng bo trn gc vi bn knh xc nh Lnh : DESIGN FEATUREINSERT . Hoc click edge blend:

Chamfer : dng vt phng gc (gc trong hay gc ngoi) Lnh : DESIGN FEATURE.INSERT Hoc click Chamber:

a.Vt gc trong b.Vt gc ngoi Thread : thread (ren) ch c th to trn mt ca hnh tr. Chc nng ca thread l to ren trn cc b mt hnh tr, ren tri hay ren phi, ren trong hay ren ngoi. N cn cho ta nhiu phng php v ren nh cut, rolled , milled hay ground . Lnh : DESIGN FEATURE.INSERT Hoc click Thread:

Trim Body : dng ct cc khi c bng cc mt phng. Lnh : DESIGN FEATUREINSERT . Hoc click Trim Body:

Split Body : dng ct khi c ra thnh 2 phn (gn ging nh Trim) bi 1 mt phng

hoc tm mng. Lnh : DESIGN FEATURE.INSERT Hoc click Split Body :

Instance :dng to nhanh cc dy (array) theo bin dng hnh ch nht hay hnh trn. Lnh : INSERT ASSOCIATIVE COPY INSTANCE FEATURE.

Boolean Operations : bao gm unite, subtract, intersect. 1.UNITE : dng ni hai phn li vi nhau. Lnh : INSERT COMBINE BODIES UNITE. Hoc click :



8.

22-08-2010 01:43 AM#8

neverlose

we only here today


Tham gia ngy Oct 2009 n t tp. HCM Bi gi 850

Cm n : 569 c cm n 1,059 ln 420 bi


2.SUBTRACT : dng ct b phn no trn khi c. Lnh : INSERT COMBINE BODIES SUBTRACT. Hoc click :

2.INTERSECT : dng to ra hnh bng cch giao hai khi c li vi nhau. Lnh : INSERT COMBINE BODIES INTERSECT.Hoc click :

1.1.FEATURE OPERATIONS ON MODELS : 1.1.1.Dng m hnh vis lc gic : To file mi v lu li vi tn Impeller_hexa-bolt. Chn INSERT DESIGN FEATURE CYLINDER Hnh tr to ra phi c tm mt y trng vi gc ta v hng theo chiu dng trc Z. cc thng s ca hnh tr : ng knh 0,25 in, cao 1,5 in.

By gi ta s to mt tm trn ging u ca vis : To mt cylinder trn nh ca hnh tr va v. Kch thc : ng knh 0,387in, cao 0,0156in.

Trn ca s POINT CONSTRUCTOR, click vo CENTER. Click vo mt trn ca hnh tr mi v chn tm ca mt . Trong phn BOOLEAN chn UNITE. Click OK ta c hnh v nh bn di.

Lu li file. K tip ta s to u lc gic cho vis : Chn biu tng POLYGON trn thanh CURVE TOOLBAR. Trong ca s POLYGON, nhp 6 cnh

vo NUMBER OF SIDES. Click OK.

C 3 cch to a gic : INSCRIBED RADIUS SIDE OF POLYGON CIRCUMSCRIBED RADIUS

Chn SIDE OF POLYGON Trn ca s k, nhp cc thng s kch thc vo : Side = 0.246 inches Orientation Angle = 0.00 degree Click OK Trn ca s POINCONSTRUCTOR, chn biu tngCENTER Click mt nh ca phn u vis va v.

a gic v xong s ging nh hnh bn di, c th nhn c nh th ta chn ch WIREFRAME WITH DIM EDGES

K tip ta s ko di (extrude) phn a gic va v to phn u vis. Chn INSERT DESIGN FEATURE EXTRUDE Click vo 6 cnh ca a gic va v to bin dng cho vic extrude n. Nhp vo End Distance l 0.1876 inches Sau khi extrude ta c hnh v tng t nh sau :

Trn nh ca phn tr c ng knh 0,387in ta thm mt hnh tr khc vi cc thng s kch thc sau Diameter = 0.387 inches Height = 0.1875 inches Ta ch c th nhn thy phn hnh tr mng ny ch wireframe bi v n nm khut bn trong phn u lc gic. M hnh ch wireframe nh hnh di :

By gi ta s dng ng dng INTERSECT ca FEATURE OPERATIONS. Chn INSERT DESIGN FEATURE SPHERE Chn DIAMETER, CENTER Nhp vo kch thc ng knh l 0,55in Trn ca s POINT CONSTRUCTOR chn CENTER.

Chn mt y ca phn tr ta va v.

Click OK, ta thy xut hin hp thoi BOOLEAN OPERATION nh hnh bn. Chn INTERSECT Click chn phn u lc gic

Click OK ta c hnh bn di :

Sau y ta s v tip phn ren cho thn vis. Chn INSERT DESIGN FEATURE THREAD. Ta thy hp thoi THREAD nh hnh bn C 2 la chn chnh to ren l SYMBOLIC v DETAILED Click chn DETAILED Chn ren phi RIGHT HANDED Click chn thn vis Click OK

Cui cng ta c vis lc gic ging nh hnh bn di. Lu li file.



9.

22-08-2010 02:05 AM#9

neverlose

we only here today




1.1.1.Model a L Bar : Trong v d ny ta s ng dng cc chc nng trong feature operations nh edge blend, chamfer, v subtract. To file mi v lu li vi tn Arborpress_Lbar Chn INSERT DESIGN FEATURE BLOCK To mt khi hnh ch nht vi cc kch thc nh sau :

Length = 65 inches Width = 65 inches Height = 285 inches To mt khi ch nht khc cng nm gc ta vi kch thc sau : Length = 182 inches Width = 65 inches Height = 85 inches

C th bn cn phi dng POINT CONSTRUCTOR t khi hnh ch nht ny gc ta . Sau khi hon tt ta s thy hai khi nm nh hnh v sau :

By gi ta phi di chuyn khi th hai ln phn u ca khi th nht. Click EDIT TRANSFORM Chn khi th hai (khi nm ngang) Click OK Click TRANSLATE Chn DELTA Nhp 200 vo DZC v click OK Click MOVE sau CANCEL ca s k khng lp li qu trnh ny. Sau khi di chuyn ta c hnh sau :

Sau y ta s to mt l, c nhiu cch to l. y ta s to mt cylinder (hnh tr c), sau ta s tr i v li mt l vi kch thc ging hnh tr trn. Chn INSERT DESIGN FEATURE CYLINDER Trn ca Vector Constructor, chn biu tng trc YC Chn biu tng Point Constructor, nhp cc thng s xc nh im t tm ca cylinder : XC = 130 YC = -5 ZC = 242

Nhp cc thng s kch thc ca cylinder : Diameter = 35 Height = 100 Trong ty chn ca Boolean, chn Subtract Chn Block nm ngang

Click OK ta c hnh v nh bn di

By gi ta s to mt l khc cng trn khi nm ngang. nh v hng l theo hng ca trc Y Xc nh ta tm ca l nh sau : XC = 130 YC = 22.5 ZC = 242 Kch thc l : Diameter = 66 Height = 20 Ta cng lm tng t nh cc bc to l trn ta c hnh v sau (chn wireframe xem )

By gi ta s to mt rnh bng cch subtract mt block (ging nh to l nhng ta dng block thay v cylinder) Chn INSERT DESIGN FEATURE BLOCK Nhp cc thng s kch thc ca block nh sau : Length = 25 Width = 20 Height = 150

Xc nh v tr gc ca block bng cch chn Point Constructor v nhp vo cc thng s ta sau : XC = 157 YC = 22.5 ZC = 180 Ta s thy m hnh nh sau :

By gi ta s Subtract phn block va to vi cc l lc ny : Chn INSERT COMBINE BODIES SUBTRACT Click vo block v 2 l (lu Target : khi nm ngang, Tool : khi va to)

Khi ca s Class Selection xut hin, chn block va mi to Click OK ta s c hnh bn :

By gi ta s bo gc vung ca hai khi. thc hin c lnh ny ta phi ni (unite) hai khi li vi nhau : Chn INSERT COMBINE BODIES UNITE Click chn hai khi v chn OK Ta c hnh nh sau (sau khi Unite ta khng cn thy cc ng giao nhau gia hai khi)



10.

22-08-2010 02:25 AM#10

neverlose

we only here today




Chn INSERT DETAIL FEATURE EDGE BLEND i Default Radius sang 60 Chn cnh m mi tn trn hnh ang ch vo

Chn OK ta c hnh v sau :

Lm li cc bc tng t un gc trong vi bn knh l 30.

Lu li file. By gi ta s to 4 l khc, ta c th to l bng cch s dng chc nng Hole. Tuy nhin chng ta ang thc hnh phn

Feature Operations , nn ta s dng cc cch to l nh trn trnh by. To cc l c kch thc ging nhau :

Diameter = 8 Height = 20

To cc l theo hng ca trc X vi cc tm c xc nh nh sau :

Sau khi Subtract ta c hnh sau :

Cui cng ta to mt block v subtract n t cc block trn. To block vi cc kch thc sau :

Length = 60 Width = 20 Height = 66 Xc nh ta gc ca block (dng Point Constructor) XC = 130 YC = 22.5 ZC = 209.5 Sau khi to xong block, Subtract block ny t block nm ngang bng cch click vo block ban u, sau chn block va mi to.

Cui cng ta c hnh v nh sau :

1.1.1.Model a Hexagonal Nut (ai c lc gic) :

To file mi v lu li vi tn l Impeller_hexa-nut. Click biu tng hnh a gic t thanh cng c To hnh lc gic vi kch thc mi cnh l 0.28685 c tm trng vi gc ta .

n xut (extrude) hnh lc gic vi chiu cao 0.125 inc ta c hnh nh sau :

Chn INSERT DESIGN FEATURE SPHERE

Chn CENTER, DIAMETER

Nhp vo thng s ng knh = 0.57inc Dng Point Constructor xc n tm ca khi cu nh sau :

XC = 0 YC = 0 ZC = 0.125 Trong phn Boolean ta chn INTERSECT Ta c hnh v sau :

By gi ta s dng lnh Mirror

Chn EDIT TRANSFORM

Chn model v click OK Click MIRROR THROUGH A PLANE

Click chn mt phng cn cha cc cnh cha b vt (lu khng chn cc cnh) Click OK Click COPY Click CANCEL

1.

Ta c hnh v sau :

By gi ta ni 2 khi li vi nhau bng lnh UNITE Chn INSERT COMBINE BODIES UNITE Chn 2 khi v ni chng li

Ta s to l cho ai c bng cch to l ging nh trnh by cc phn trn To l theo phng Z vi cc kch thc

Diameter = 0.25 Height = 1

Tm ca hnh tr trng vi gc ta .

By gi ta dng lnh CHAMFER vt cnh bn trong ca ai c Chn INSERT DETAIL FEATURE> FEATURE CHAMFER Chn 2 ng trn bn trong v nm trn 2 mt ca ai c.

Trong Distance ta nhp vo thng s 0.0436 inc v click OK. Cui cng ta c mt ai c su cnh nh hnh v :

1.1.1.Model a (thanh rng) with Instances : M file Arborpress_rack.prt

Chn INSERT --> DESIGN FEATURE --> POCKET Trong hp thoi mi xut hin, ta chn RECTANGULAR

Chn mt trn ca thanh nh hnh v

Chn cnh tham chiu nh hnh v bn di

Ta thy xut hin ca s cc thng s nh sau :

Nhp vo cc thng s hnh hc ging nh hnh sau, sau click OK

Chn ch Wireframe c th nhn c r rng hn.

Khi ca s POSITIONING xut hin, ta la chn PERPENDICULAR.

Sau ta la chn 2 cnh nh trong hnh v v nhp thng s 37.8inc vo :

Lp li bc trn vi la chn 2 cnh nh hnh v v khong cch ti cnh tham chiu l 10 inc v chn OK 2 ln

Ta c hnh nh sau :

Tip theo ta s hon tt vic v cc rng ca thanh rng n khp vi cc rng ca bnh rng . Chn INSERT --> ASSOCIATIVE COPY--> INSTANCE FEATURE Chn RECTANGULAR ARRAY t la chn Chn RECTANGULAR POCKET t hp thoi INSTANCE nh hnh v :

Nhp cc thng s nh hnh di. Ta s to c 19 rnh tnh lun c rnh ban u.

Click OK Click YES

Click CANCEL Sau ta s to l ng knh 10 inc v su 20 inc nh hnh v bn di.



2.

22-08-2010 02:41 AM#12

neverlose

we only here today


Tham gia ngy Oct 2009

n t tp. HCM Bi gi 850 Cm n : 569 c cm n 1,059 ln 420 bi


Bi 4TO BN V 2D4.1.KHI QUT : ng dng Drafting da trn cc hnh chiu ca m hnh 3D nh bn di. Drafting gip cho ta d dng to ra cc hnh chiu trc giao, cc hnh chiu ph, kch thc v cc li ch thch.

Mt s cc c im hu ch ca ng dng Drafting l : Sau khi bn to ra hnh chiu th nht th cc hnh chiu cn li s d dng c to ra bng cch ging cc hnh chiu bng cch click chut. Mi hnh chiu c lin quan trc tip n m hnh 3D. V th khi ta thay i m hnh th bn v drafting cng s t ng cp nht cc thay i . Cc ghi ch ca bn v (kch thc, labels ) c t trc tip trong Drafting v t ng cp nht khi m hnh c s thay i.

1.2.DRAFTING OF MODELS :

1.2.1.Drafting : M file Arborpress_rack.prt Chn START ALL APPLICATIONS DRAFTING nh hnh v.

Trong hp thoi SHEET, ta chn sheet B, kch thc 11 x 7; trong CUSTOM SCALE chn t l 1 : 25. Sau click OK.

Ta s thy xut hin ca s DRAFTING nh sau :

Chn INSERT VIEW BASE VIEW Ta thy c hp thoi BASE VIEW. Trong phn VIEW ta chn FRONT. Trn ca s drafting ta c th thy c hnh chiu ca thanh rng. Ta c th di chuyn chut v click t hnh chiu v

tr mong mun.

Ta c th di chuyn chut c cc hnh chiu khc. Di y l mt s hnh :

Nu ta mun thm mt hnh chiu na sau khi ng file hoc chuyn sang cc lnh khc, ta lm nh lnh sau : Chn INSERT VIEW PROJECTED VIEW By gi ta to ra 2 hnh chiu ging nh hnh di y.

Click phi chut vo hnh chiu va to sau cng, chn ADD PROJECT VIEWS, di chuyn chut sang bn phi c hnh chiu nh sau :



3.

22-08-2010 02:52 AM#13

neverlose

we only here today




Bm ESCAPE trn bn phm thot lnh to hnh chiu. By gi ta s xa cc ng bin (khung hnh ch nht) c to ra trn cc hnh chiu. Chn PREFERENCES DRAFTING Hp thoi DRAFTING PREFERENCES xut hin, chn tab VIEW. B du kim DISPLAY BORDERS, click OK.

1.1.1.Dimentioning (ghi kch thc) :

By gi ta s ghi kch thc cho cc hnh chiu va v trn. C 2 cch ghi kch thc : Chn INSERT DIMENSION Click vo thanh cng c DIMENTION nh trong hnh

Chn INSERT DIMENSION INFERRED Hp thoi INFERED DIMENTION c m ra. N gip ta thay i cc thuc tnh kch thc ca bn v.

Phn VALUE cho php ta ghi cc kch thc danh ngha, dung sai Phn TEXT ghi cc nhm, cc yu cu k thut khc Phn SETTING l phn iu chnh cc thuc tnh ghi kch thc. y ta c th chn cc ty chnh l mc nh cho vic ghi kch thc. Ta ghi kch thc u tin, hnh chiu u tin (FRONT ) ta chn gc trn bn tri ca thanh rng, sau chn tip gc trn bn phi. Kch thc gia hai im ta va chn c hin th ra, ta c th chn v tr ca ng kch thc bng cch di chuyn chut. Click chut ghi kch thc nh hnh v sau :

Ta c th thay i cc thuc tnh ca kch thc ngay sau khi ghi n bng cch sau Click phi vo ng kich thc va to v chn STYLE. Tng CHARACTER SIZE n 0.2 v click OK.

Hon thnh vic ghi kch thc ta c bn v nh th ny.

1.1.2.Sectional View (hnh ct) : Ta s v hnh ct biu din su v bin dng ca l trn thanh rng. Chn INSERT VIEW SECTION VIEW Chn hnh chiu BOTTOM nh hnh v. Ta thy xut hin ng t nt mu cam vi hai mi tn ch hng nhn vo mt ct.

Click chut t ng t nt nh hnh trn. Di chuyn chut t hnh ct bn di nh hnh v.

Lu li file. 1.1.3.Lp bn v 2D v ghi kch thc cho boulon lc gic : M file Impeller_hexa-bolt.prt. Chn START DRAFTING Trn ca s Drawing, chn E-34 X 44 v thay i Numerator Scale valuesang 8.0.

Chn INSERT VIEW BASE VIEW Chn hnh chiu ng (FRONT) vo bn v, chn thm hai hnh chiu cnh v hnh chiu bng nh hnh v.

hin ln cc ng khut ta dng lnh PREFERENCES VIEW hoc nhp phi vo hnh chiu v chn STYLE. Trong ca s VIEW STYLE ta chnHIDDEN LINES, i trng thi INVISIBLE sang trng thi DASHED LINESnh hnh minh ha.

By gi ta s ghi kch thc cho boulon. Chn INSERT DIMENSIONS VERTICAL.

Ghi kch thc ging hnh minh ha. Chn INSERT DIMENSIONS PARALLEL Ghi 2 kch thc nh hnh minh ha.

ghi kch thc cho ren ta dng leader line. Click vo biu tng nh hnh v.

Trong ca s Annotation Editor ta nhp cc dng ch ghi kch thc vo : Right Hand 0.20 X 1.50 Pitch 0.05, Angle 60 Click chut vo thn ren v chn v tr, click ln na nh v tr dng ch.thay i ni dung bi: neverlose, 22-08-2010 lc 03:02 AM


4.

22-08-2010 03:19 AM#14

neverlose

we only here today




Bi 5CC THAO TC VI SKETCH

5.1.KHI QUT : Sketching hiu mt cch n gin l ta to cc ng bin trn mt phng 2D, sau c th dng cng c extruded, revolve, swept to nn hnh khi 3D t cc bin dng . y cng l mt cch chng ta to ra cc m hnh 3D c tnh cht phc tp cao.

Cc ng trong bn v sketch 2D c th rng buc vi nhau bng 2 cch : Rng buc v hnh hc (Geometric Constraints) Rng buc v kch thc (Dimentional Constraints) Nh chng ti ni trn, bn v sketch c th to nn hnh 3D bng nhiu cch. Sau y l mt s cch in hnh : Revolved (xoay trn bin dng)

Extruded (n xut)

Swept (qut theo mt bin dng)

Nhng tin ch ca vic dng Sketching so vi vic dng cc chc nng to 3D trc tip (Primitives) : Dng cho cc m hnh c bin dng phc tp. Cc ng trong sketch c nhng mi quan h rng buc vi nhau, ta c th d dng thay i cc thng s ca chng. Nu mt mt phng m ta ang lm vic vi sketch b thay i th n cng s thay i theo mt cch thch hp. Sketch c th tin dng cho ta iu khin cc bin dng hnh hc ca m hnh. c bit ta c th thay i cc bin dng ny sau khi v. 5.2.SKETCHING TO RA M HNH 3D : 5.2.1.Model an Arbor Press Base : To mt file mi v lu li vi tn l Arborpress_base.prt Chn INSERT SKETCH hoc click vo biu tng Ca s ty chn CREATE SKETCH xut hin. trong bn c th chn mt phng to sketch, hng sketch. Thng thng khi m Sketch th n s mc nh l mt phng X-Y, ta c th thay i mt phng bng cch chn trc

tip trn gc ta nh hnh v.

Chn XC YC plane v click OK. Mt phng sketch xut hin, y l mt 2D vi 2 trc X v Y. Mt mt phng ca m hnh 3D m ta to trc cng c th c s dng nh mt mt phng sketch. Hnh di y l ca s sketch vi nhiu chc nng phong ph :

Ta c th i tn ca sketch trong phn sau : 1.2.1.1.Thanh cng c Curve : Thanh cng c Curve cha nhiu chc nng to cc ng cong, ng spline, editing, extending, trimming, filleting mi loi chc nng c cch la chn khc nhau. Sau y ta s i chi tit tng chc nng : Profile : y l cng c to bin dng, c th l ng thng hoc ng cong. Ta c th truy bt im bng cch dng h trc ta , hoc nhp trc tip cc kch thc chiu di, gc ca cc ng ging hnh minh ha bn di.

Line : Dng v cc ng thng. Arc : dng v cung trn vi 2 cch : To cung trn vi cc ta cc im.

To cung trn vi tm, bn knh v gc tm hoc tm, im u v im cui.

Circle : dng v cc ng trn vi cc cch v tng t nh v cung trn. Quick Trim : dng ct cc on tha ca cc ng giao nhau. Studio Spline : dng to ra cc ng cong spline c bn.



5.

22-08-2010 03:28 AM#15

neverlose

we only here today




5.1.1.1.Constraints Toolbar :

Tt c cc ng trong NX c v bng vic truy bt im. V d mt ng thng c v bng cch truy bt 2 im. Trong mi trng 2D, mi im c 2 bc t do theo 2 phng trc X v Y. Nhng bc t do ny c th c rng buc li bng cch to ra cc quan h rng buc hnh hc hoc rng buc v kch thc. Sau y l mt s cc quan h rng buc chnh : Dimensional Constraints: (rng buc kch thc) Geometric Constraints:rng buc hnh hc Show all Constraints: Show/Remove Constraints: 1.1.1.2.Sketcher Toolbar : Orient View to Sketch: hin th sketch trong mt phng song song vi mn hnh. Reattach Sketch: chuyn sketch sang mt phng khc Update Model: khi thay i trong sketch m click biu tng ny, ta s thy kt qu m khng cn thot khi ch d sketch. By gi ta s v cc ng vi cc chc nng c cp trn : Chn INSERT PROFILE V hnh tng t nh hnh minh ha bn di.

By gi ta s thm vo cc rng buc. Nn thit lp cc rng buc v hnh hc trc, sau mi dng cc rng buc v kch thc. Chn INSERT CONSTRAINTS hoc click vo biu tng u tin ta s di tm ca cung trn v gc ta . Chn trc Y, sau chn tm ca cung trn. Click CONSTRAINTS. Lm li tng t nh bc trn vi trc X.

Chn 2 ng nghing v cho chng bng nhau v chiu di (Equal Length).

Lm tng t cho 2 ng thng ng di.

Chn 2 ng ngang y v cho chng nm ngang nhau (Collinear), sau cho tt c cc on thng ging nhau bng nhau v kch thc.

Chn cung trn v 2 cnh ni vi n. Click Tangent icon

Chn 2 cnh dc v rng buc chng di bng nhau.

Rng buc 2 ng ngang v cho chng thng hng, di bng nhau.

Chng ta va to cc rng buc v hnh hc, tip theo chng ta s to cc rng buc v kch thc. Khi chng ta thm cc rng buc v kch thc ta thy cc bc t do (mi tn vng) mt i. NX khng cho php to nhn i 2 kch thc ging nhau. iu ny cho thy s tin li khi ta rng buc bng quan h hnh hc trc quan h kch thc. Nu c mu thun gia rng buc v kch thc v rng buc hnh hc th cc i tng mu thun s hin th mu vng. Chn biu tng INFERED DIMENTIONS trong thanh cng cCONSTRAINTS Ghi kch thc ging hnh bn di.

Click EXIT SKETCH hon tt.thay i ni dung bi: neverlose, 22-08-2010 lc 03:33 AM


6.

22-08-2010 03:34 AM#16

neverlose

we only here today



Cm n : 569 c cm n 1,059 ln 420 bi


Click EXIT SKETCH hon tt. Click chn sketch v nhp phi, chn INSERT DESIGN FEATURE EXTRUDE n xut sketch theo phng Z vi chiu cao l 60inc

To l ng knh 4inc v cao 30inc im (0,35,0) trong h ta WCS. Cui cng ta ng vt th nh hnh v bn di.

Lu li file. 1.1.1.Model an Impeller Lower Casing To file mi vi tn Impeller_lower-casing.prt. M sketch vi mt phng XY V ng phc ha nh hnh v, dng lnh Profile .

Click INSERT POINT To mt im gc ta (0,0,0) v click OK Click CANCEL thot ca s POINT CONSTRUCTOR. Tip theo ta s thm cc rng buc, click biu tng CONSTRAINTS Chn im gc ta lc ny v click vo biu tng FIXED

Rng buc cc ng thng-ng cong, ng cong-ng cong tip tuyn vi nhau. Sau thm cc rng buc kch thc vo nh hnh bn di.

Chn tt c cc kch thc, right click chn HIDE n chng. Chn EDIT TRANSFORM Click nt TYPE FILTER, lc ra cc CURVE.

Chn cc ng cong v click OK trn ca s TRANSFORM. TRANSLATE v COPY n theo chiu m trc Y vi thng s l 0.5inc . Sau ni 2 u cc on thng nh hnh v.

Click EXIT SKETCH. Click INSERT DESIGN FEATURE REVOLVE Click chn sketch ta s thy c 10 i tng ng c chn.

Trong hp thoi AXIS, phn SPECIFY VECTOR ta chn chiu dng trc X. Trong phn SPECIFY POINT, nhp ta (0,0,0), lc cc ng phc ha s xoay trn quanh trc X. Nhp thng s gc bt u (START ANGLE) l 0. Gc kt thc (END ANGLE) l 180. Click OK.

By gi ta s to ra cc cnh nh sau Chn INSERT SKETCH Chn mt phng XY Chn EDIT TRANSFORM Lc ra cc CURVE trong phn TYPE FILTER Chn cc ng phc ha ngoi ging nh hnh minh ha sau.

Click OK, TRANSFORM, DELTA CLICK OK Click EXIT SKETCH Chn EDIT TRANSFORM Lc ra cc CURVE TRANSLATE ng curve di theo trc Y vi thng s l 1.5inc

Dng cc ng thng ni cc u mt ca cc ng li

Click INSERT DESIGN FEATURE EXTRUDE Chn cc ng phc ha ta va v trn v 2 on thng ni cc ng . n xut tm ny vi chiu dy l 0.5inc theo chiu m trc Z Ta s c hnh ging hnh di y.

By gi ta s chiu i xng phn va n xut bng lnh Mirror. Chn EDIT TRANSFORM Chn b lc l SOLID BODY, chn phn va n xut.

Chn MIRROR THROUGH A PLANE Chn trc Y trong hp thoi PLANE

Chn COPY v OK ta c hnh v nh sau

By gi ta s to tm khc u ca chi tit. To sketch mi v v ng phc ha nh sau (hnh ch nht kch thc 2 x 1.5 inc)

Thot khi sketch, chn REVOLVE v chn i tng sketch va v, xoay i tng quanh trc X vi gc xoay 180 . Cui cng ta c hnh v nh sau.

Lu li file.thay i ni dung bi: neverlose, 22-08-2010 lc 03:45 AM


7.

22-08-2010 03:47 AM#17

neverlose

we only here today




5.2.3.Model an impeller : To file mi v lu li vi tn Impeller_impeller.prt M mt sketch mi trn mt phng XY : INSERT SKETCH Click INSERT POINT to 2 im vi ta (0,0,0) v (11.75,6,0) Click vo biu tng ARC, click chn ARC BY CENTER AND ENDPOINTS. Click vo im ngay gc ta v v cung trn bn knh 1.5inc ging hnh bn di. Click vo im (11.75,6,0) v v cung trn bn knh 0.5inc. Click vo biu tng v cung trn qua 3 im (ARC BY 3 POINTS). Bt im u ca 2 cung v click vo ch bt k gia 2 cung ni chng li vi nhau. Lm tng t cho 2 im cui ca 2 cung. Click CONSTRAINTS, thm rng buc sao cho tt c cc cung u tip tuyn(tangent) vi nhau. Click vo im gc ta v chn FIXED. Hnh v sketch sau khi hon tt :

Sau thm cc rng buc kch thc nh hnh di.

Click EXIT SKETCH By gi ta s model dng hnh cone. Chn INSERT DESIGN FEATURE CONE Chn DIAMETER, HEIGHT Chn trc X Nhp cc thng s kch thc sau : Base Diameter = 15 inches Top Diameter = 8 inches Height = 16.25 inches Trong POINT CONSTRUCTOR, nhp ta (14,0,0)

Ta c hnh v nh sau :

n xut (EXTRUDED)ng phc ha vi chiu dy l 13inc.

Ni 2 khi li vi nhau bng lnh INSERT COMBINE BODIES UNITE Ta s to ra 5 cnh qut vi chc nng INSTANCE. Chn INSERT ASSOCIATIVE COPY INSTANCE FEATURE Chn CIRCULAR ARRAY

Chn EXTRUDED Nhp NUMBER = 5, ANGLE = 72 Click OK Chn POINT, DIRECTION Chn trc X trong phn SPECIFY VECTOR v chn im ti gc ta trong phn SPECIFY POINT. Click YES

By gi ta s to l cho trc v cht kha. To v ct (SUBTRACT) mt hnh tr ng knh 4inc , cao 16inc mt nn ln. Tng t cho mt nn nh ta cng SUBTRACT mt hnh tr vi ng knh l0.275inc, cao 0.25inc. Cui cng ta c hnh v nh sau :

Bi tp : Model an Impeller Upper Casing (kch thc ging vi Impeller Lower Casing)



8.

22-08-2010 08:43 AM#18

neverlose

we only here today




Bi 6CC FEATURE C BIN DNG T DO

1. 2. 3. 4. 5. 6.

6.1.Khi qut : 6.1.1.To Freeform Feature t cc im : Ta s to ra cc Freeform Feature bng cc im, c th s dng mt trong cc ty chn sau xy dng m hnh t cc im c cho trc. Click INSERT SURFACE From Point Cloud : nu bn c cc im nm ri rc Through Points : nu cc im c nh ngha sp xp thnh mt dy hnh ch nht. From Poles : nu cc im c nh ngha sp xp thnh mt dy hnh ch nht tip xc vi cc ng i xuyn qua chng.

6.1.2.Creating Freeform Features from Section Strings : Nucu trc hnh hc ca m hnh gm cc i tng c lin kt vi nhau (cc ng, mt, cnh ), ta c th dng mt trong 2 ty chn sau y to feature : Click INSERT MESH SURFACE Ruled : c dng khi c 2 dy gn song song nhau

Through Curves : c dng khi c 2 hay nhiu dy gn song song

Nu cu trc hnh hc ca m hnh cc dy gn song song nhau, v mt hay nhiu dy vung gc vi ng u tin, ta c th dng mt trong cc ty chn sau to feature :

Through Curve Mesh : dng khi c t nht 4 on dy tn ti

vi t nht 2 dy mi hng. Swept : dng khi c 2 on dy gn vung gc nhau.

6.1.3.Creating Freeform Features from Faces : Nu m hnh cha cc i tng dng tm hay l mt, ta c th dng 1 trong 2 cch sau to feature : Click INSERT OFFSET/SCALE Offset Surface : nu ta c mt i tng mt offset.

Extension : nu ta c mt mt v mt cnh, cnh cong, hay cc ng phc ha trn mt.

6.2.FREEFORM FEATURE MODELING : 6.2.1.Modeling with points : M file freeform_thrupoints.prt Click phi vo thanh cng c v nh du hin th cng c SURFACE Bn s thy 7 dy vi rt nhiu im nh hnh v bn di.

Chn INSERT SURFACE THROUGH POINTS Hoc click vo biu tng Ca s THROUGH POINTS xut hin nh hnh v

Chn MULTIPLE cho phn PATCH TYPE Chn NEITHER cho phn CLOSE ALONG Trong phn ROW DEGREE v phn COLUMN DEGREE nhp vo s 3 Click OK Ta s thy xut hin hp thoi k tip nh hnh

Click CHAIN FROM ALL Chn 2 im u v cui ca dy ngoi cng bn tri nh hnh minh ha

Dy u tin s c highlight nh hnh minh ha

Lp li bc la chn trn chn 4 dy u tin. Sau , mt hp thoi xut hin vi cu hi l tt c cc dy im c xc nh hay l ta mun xc nh thm cc dy khc.

Chn SPECIFY ANOTHER ROW, tin hnh cc bc cho n khi tt c cc dy c xc nh. Khi m tt c cc im c xc nh, ta chn ALL POINTS SPECIFIED Click CANCEL trn ca s THROUGH POINTS Click vo biu tng SHADED

Bn s thy mt surface ging nh hnh sau :

CH : KHNG LU LI FILE NYhttp://my.opera.com/phuochaivn/blog/ each second count! YM: phuochai_qnTrch Dn

9.

22-08-2010 08:54 AM#19

neverlose

we only here today




6.1.1.Modeling with a point cloud : M file freeform_cloud.prt m my im (POINT CLOUD) nh hnh v :

Chn INSERT SURFACE FROM POINT CLOUD hoc click vo biu tng trn thanh cng c. Mt hp thoi xut hin :

phn pha di ca hp thoi ta nhn thy dng ch Confirm Upon Apply. Ty chn ny cho php ta xem v phn tch feature trc khi to ra n. Phi chc chn rng khng nh du kim vo ty bin Confirm Upon Apply. Chn tt c cc im trn mn hnh bng cch ko th. Sau khi ta chn tt c cc im th s ging nh hnh minh ha bn di y :

Trn ca s, ta chn WCS cho h trc ta (COORDINATE SYSTEM). iu ny s gip gn h ta ca m my im vi gc ta ban u (ORIGINAL SYSTEM). Di phn BOUNDARY ta chn MINIMUM BOX. Ty chn ny l hnh thnh khung bao quanh m my im. Gi cc gi tr mc nh ca U v V DEGREE l 3 Click OK Click vo biu tng SHADED xem m hnh Cui cng ta c mt sheet nh hnh v.

Ch khng lu li file. 1.1.2.Modeling with curves : M file freeform_thrucurves_parameter.prt Cc ng phc ha c hnh nh sau :

Chn INSERT MESH SURFACE THROUGH CURVES hoc click vo biu tng trn thanh cng c. Trong hp thoi THROUGH CURVES, chn ng curve u tin (lu l chn ti mt im no bn tri ca ng curve )

Ta thy xut hin vector ch hng cui ng curve Click chut gia, click vo ng curve tip theo v click chut gia, mt mt cong c hnh thnh gia 2 ng curve nh hnh minh ha

Lm li cc bc to mt nh trn cho cc ng curve cn li, lu l phi click chut gia sau mi ln khi chn curve.

Trong phn ALIGNMENT v OUTPUT SURFACE ca hp thoi, ta chnSINGLE cho phn PATCH TYPE, chn PARAMETER cho phn ALIGNMENT, chn SIMPLE cho phn CONSTRUCTION. Khi chc nng SIMPLE c thc thi, NX s t tm cch to ra mt cong n gin nht, vi s lng mng (patch) l nh nht. Click OK Nu bn khng th nhn thy mt cong th chn biu tng shaded trn thanh cng c.

Lu l khng lu li file ny.

1.1.3.Modeling with curves and faces : M file freeform_thrucurves_faces.prt Trong hnh bn, ta thy c mt ng curve v 2 mt surface :

Chn INSERT MESH SURFACE THROUGH CURVES Chn cnh bn tri ca mt trn v click chut gia Tip theo chn cnh curve v click chut gia.

Trong hp thoi SETTING, b ty chn PRESERVE SHAPE

Phi chc chn l tt c cc mi tn cng ch mt hng, nu khng ta phiCANCEL v lp li bc trn. Trong hp thoi ALIGNMENT ta chn PARAMETER Trong hp thoi continuity chn G2 (CURVATURE) v chn 2 mt trn

Click APPLY

Tip theo chn cnh gia v click chut gia Chn cnh ca mt thp hn v click chut gia Click chut gia hon thnh vic chn curve Thay i thuc tnh sang g2 (curvature) trong hp thoi CONTINUITY Chn 3 mt di (nh hnh) v nhn chut gia

Chn mt bn va to ra cho rng buc CONTINUITY (lin tc) nh hnh trn Click APPLY v CANCEL Cui cng ta c hnh sau (khng lu li file)



10.

22-08-2010 09:12 AM#20

neverlose

we only here today



Cm n : 569 c cm n 1,059 ln 420 bi


Bi 7LP RP CHI TITTrong chng ny ta chng ta s hc cch lp rp cc chi tit. Hng ngy chng ta bt gp rt nhiu cc kt cu c lp rp t cc chi tit ring bit. Mi chi tit s c thit k v ch to mt cch ph hp m bo thun li cho vic lp rp sau ny. Trong chng ny ta s nghin cu hai phng php lp rp. Chng ta s thc hnh vi vi cnh tua bin v mt s chi tit c to t cc chng trc. 7.1.Khi qut : NX5 Assembly l mt file lp rp trong c cha nhiu chi tit ring bit. Chng c thm vo file lp rp nh nhng chi tit o v c lin kt vi file thit k gc. iu ny gip cho my khng cn phi to nhng vng nh khc nhau khi lu tr file. Tt c cc chi tit u c th c la chn v s dng trong qu trnh thit k, m bo iu kin thun li cho vic lp rp sau ny. Hnh bn di l s th hin cu trc ca mt kt cu lp rp :

7.2.Cc thut ng : Cm chi tit (Assembly) Mt cm chi tit l tp hp ca nhiu chi tit nh hoc cc cm chi tit ph vi nhau. File assembly c xem nh mt file chi tit trong c cha nhiu i tng lp rp. i tng lp rp (Component Object) Mt i tng lp rp cha ng dn t cm chi tit ti file gc ca chi tit lp rp. Chi tit lp rp (Component Part) Mt chi tit lp rp l mt file c ch nh bi i tng lp rp trong cm chi tit. cc bin dng ca n c lu tr trong chi tit lp rp, khng phi copy t cm chi tit.

7.3.Lp rp cc chi tit : C hai phng php c bn to mt chi tit lp rp : Phng php lp rp t trn xung (Top Down Approach) Phng php lp rp t di ln (Bottom Up Approach) 7.3.1.Phng php lp rp t trn xung (Top Down Approach) : Theo phng php ny, u tin ta phi to mt file lp rp, cc chi tit lp rp s c thit k trong . Sau cc chi

tit nh s c to ra. Phng php ny thng c dng nhiu khi thit k mt sn phm mi hon ton.

7.3.2.Phng php lp rp t di ln (Bottom Up Approach) : Khi dng phng php ny, cc chi tit lp rp s c to ra trc tin theo cch truyn thng v sau s c thm vo file lp rp. Phng php ny c mt u im l ta c th s dng li mt chi tit lp c thit k trc .

7.3.3.Kt hp : Bn c th kt hp c hai phng php vi nhau khi cn thit tng tnh linh hot trong qu trnh thit k lp rp. 7.4.Cc iu kin lin kt : Mi i tng s c lp rp tng ng vi mt i tng khc. c th lp rp cc chi tit li vi nhau th ta phi thm cc iu kin lin kt gia chng nh cc tng quan v v tr, cc rng buc hnh hc Cc iu kin ny c gi chung l rng buc lin kt. Mt mi ghp c th bao gm mt hoc nhiu hn mt rng buc lin kt. C tt c 8 rng buc lin kt : Mate : c dng lin kt hai mt phng i din li kht li vi nhau Align : lin kt cc mt phng ng phng nm ngang nhau Angle : lp rp hai i tng ca hai chi tit theo mt gc c nh Parallel : lp rp hai i tng song song nhau Perpendicular : lp rp hai i tng vung gc vi nhau Center : i tng c chn s nm chnh gia hai i tng khc, v d lp mt hnh tr di nm dc theo rnh vi

iu kin ng tm ca hnh tr nm gia rnh Distance : to mt khong offset dng hay m gia hai i tng Tangent : to mi tng quan tip xc gia hai i tng, trong phi c mt i tng c b mt cong, hnh trn, hoc hnh tr Hp thoi Mating Conditions (iu kin rng buc) hnh bn di :

7.5.Lp rp cnh tua bin : By gi chng ta s bt u tin hnh lp rp cc chi tit, cc chi tit c to ra t cc v d ca cc chng trc. To mt file mi v lu n li vi tn l Impeller_assembly.prt Chn APPLICATION MODELING Click APPLICATION ln na v phi m bo c du kim k bn dng chASSEMBLIES. Nu khng c th ta click vo

n Thanh cng c lp rp c to ra trn mn hnh nh sau :

Click vo ASSEMBLIES t menu bar

1.

Chng ta hu nh s dng nhiu ty chn COMPONENTS, trong bao gm: ADD COMPONENT : thm vo mt chi tit lp rp c to trc REPOSITION COMPONENT : xc nh li v tr ca cc chi tit MATE COMPONENT : lin kt cc chi tit li vi nhau Chn ASSEMBLIES COMPONENTS ADD COMPONEN T

Hp thoi Add Component c m ra :

Bn c th chn cc chi tit ang hin c hoc thm vo cc chi tit mi bng cch chn OPEN m file cn thm. Cc chi tit sau khi thm vo s nm phn LOADED PARTS. Click vo Impeller upper casing.prt Gi mc nh cc ty chn trong hp thoi PLACEMENT khng i. Bn c th nhn thy chi tit va thm vo nh hnh sau :

By gi chng ta s thm vo chi tit th hai :

Click vo ASSEMBLIES COMPONENTS ADD COMPONENT Chn Impeller lower casing.prt Trong hp thoi POSITIONING thay i ty chn sang MATE Chn APPLY Ta trn ca s xut hin mt ca s nh hin th chi tit va thm vo COMPONENT PREVIEW By gi chng ta s rp hai phn ca np tua bin li vi nhau : Phi chc chn rng chn biu tng Mate

Chn mt phng m mi tn ang ch trong ca s Component Preview hnh a di y.

Click chn mt phng ca Upper Casing (np trn) trn mn hnh chnh nh hnh b bn di. Bn c th cn phi xoay chi tit la chn c mt ny.

a) b) By gi chng ta bt u to rng buc th hai : Click vo biu tng ca rng buc Center trn ca s Mating Conditions u tin ta chn mt phng nm trn np di trong ca s Component Preview ging hnh a bn di.

Chn mt phng ca np trn ging hnh b bn di.

a) b) Chng ta s to mt rng buc na nh v cc bc t do ca np di : Click vo biu tng Align trn ca s Mating Conditions Chn hai mt phng, mt nm trn np di v mt nm np trn nh hnh bn di Click APPLY v chn OK

Sau khi lp rp ta c kt cu nh hnh v :

Tip theo ta s rp thm cnh tua bin vo : Click vo ASSEMBLIES COMPONENTS ADD COMPONENT M file Impeller impeller.prt Click OK Chng ta s ng dng rng buc v khong cch - Distance Click vo biu tng Distance trn ca s Mating Conditions Chn hai mt phng, mt trn np v mt trn cnh tuabin nh trong hnh

Trong Offset Expression nhp gi tr l -3

Trn ca s Mating Conditions chn Preview kt cu

Trn ca s Mating Conditions nhp phi chut vo rng buc Distance Chn ALTERNATE SOLUTION HOC

Click vo biu tng ny gn Selection Steps

By gi tuabin s quay theo hng nhn ng ca n :

By gi ta s ng dng rng buc Center : Click vo biu tng Center Chn hai mt phng, mt trn np v mt trn cnh tuabin nh trong hnh. Click APPLY v chn OK

Lu li file. Chng ta tip tc thm trc tuabin vo :

Click vo ASSEMBLIES COMPONENTS ADD COMPONENT M file Impeller shaft.prt Click OK Chn biu tng Center Chn hai mt phng, mt trn trc tuabin trong ca s Component Previewv mt trn cnh tuabin nh trong hnh

u tin, chn mt mt trn trc ca tuabin, sau chn mt y ca l trn cnh tuabin nh trong hnh Chn APPLY v click OK

Sau khi lp ta c cm chi tit nh trong hnh :


2.

22-08-2010 09:26 AM#22

neverlose

we only here today


Tham gia ngy Oct 2009 n t tp. HCM Bi gi

850 Cm n : 569 c cm n 1,059 ln 420 bi


Click ASSEMBLIES COMPONENTS ADD COMPONENT M file Impeller hexa bolt.prt Chn rng buc Center u tin ta chn mt ren ngoi trn bulong, sau chn b mt trong ca l nm np trn ca tuabin nh trong hnh

Chn rng buc Mate Chn mt phng trn bulong v mt phng nm trn vnh ca np trn nh trong hnh

Click APPLY v chn OK

Mi lp ging nh hnh sau :

Lm li nh bc trn cho chi tit c tn file l Impeller washer.prt Chn rng buc Center Chn mt trong ca vng m v mt ren ngoi ca bulong nh trong hnh

Chn rng buc Mate Chn mt phng u vng m, sau chn mt phng nm trn vnh ca np di tuabin nh trong hnh Click APPLY v chn OK

Mi ghp c hnh nh sau :

Thm file c tn l Impeller hexa nut.prt Chn rng buc Center Chn mt trong ca ai c v sau chn vnh ngoi ca vng m

Chn rng buc Mate Chn mt u ai c sau chn mt u di ca vng m nh trong hnh

Click APPLY v chn OK

Kt cu sau khi lp c dng nh sau :

Lp li cc bc tng t lp bulong ai c, vng m vo tt c cc l trn tuabin. Cui cng ta c kt cu lp rp tuabin hon chnh. C mt cch n gin hn lp bulong, ai c v vng m vo tuabin l ta c th lp rp 3 chi tit ny thnh mt cm chi

tit ph trong mt file lp rp. Sau ta c th lp c cm ny vo tuabin. Cm lp rp cui cng c dng nh hnh :

7.6.Xem cch tho ri cm chi tit lp rp : Trong phn ny chng ta s tm hiu cch tho ri cm chi tit c th quan st r hn tng chi tit. Trong thc t ngnh cng nghip hin nay th vic ny rt hu ch cho cc nh lp rp, n gip cho h bit c i tng no nn t v tr thch hp nht. Ngi s dng khng nn nhm ln l vic tho ri khng c ngha l xc nh li v tr ca tng chi tit m n ch gip ta c ci nhn r rng hn i vi tng chi tit ring bit. y bn c th quay tr v trng thi lp rp ban u bt k lc no. By gi chng ta bt u tho ri tuabin :http://my.opera.com/phuochaivn/blog/ each second count! YM: phuochai_qnTrch Dn

3.

22-08-2010 09:29 AM#23

neverlose

we only here today




Chn ASSEMBLIES EXPLODED VIEWS NEW EXPLOS ION Chn OK trong hp thoi Create Explosion Khi tin hnh tho ri, chng ta nn quyt nh xem cn da vo mt chi tit khc lm v tr tham chiu. Chi tit ny khng c di chuyn khi v tr ban u ca n. Trong trng hp ny th ta chn cnh tua bin l thch hp nht.

Click phi vo np trn ca tua bin v chn EDIT EXPLOSION Trong ca s Edit Explosion, click chn trc Z, gi chut v ko ln cho n khi Distance t gi tr l 20 nh trong hnh

Chn OK Click phi vo np di v chn EDIT EXPLOSION Tip tc click vo trc Z, gi chut v ko xung cho n khi Distance t gi tr -20 nh trong hnh Click OK

Click phi vo trc tuabin v chn EDIT EXPLOSION Ln ny ta click vo trc X, gi chut v ko sang phi n khi gi tr caDistance l -25 Chn OK

Chn tt c cc 6 bulong Click phi vo mt trong 6 ci v chn EDIT EXPLOSION Click vo trc Z, gi chut v ko ln n khi gi tr ca Distance l 25. Tt c 6 bulong u c nng ln cng mt lc. Chn OK

Tng t nh vy, ta di chuyn 6 ai c xung ta 30 v 6 vng m xung v tr -27. Hnh sau y th hin v tr cc chi tit sau khi tch ri :

Bn c th tr li trng thi lp rp ban u ca mt mi lp bng cch : Click phi vo mt chi tit v chn UNEXPLODE Hoc nu bn mun lp li ton b cm chi tit th ta lm nh sau : Chn ASSEMBLIES EXPLODED VIEWS UNEXPLODE COMPONENT Chn tt c cc kt cu v click OK

(ht)

giao trinh ugs

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