Phn 4 Wireframe & Surface

Chng 2.

Wireframe & Surface: Khung dy v b mt.

Phn ny s gii thiu cho bn cch v nhng khung, nhng b mt dng tm mng c bin dng khng n thun l mt phng m c th l nhng b mt cong, mt c bin dng phc tp trong h trc to 3 chiu.

2.1. Getting Started: Khi to.

Vic bt u khi to nhng b mt dng tm, bn nn thc hin theo lnh to chi tit sau:

2.1.1. Creating Wireframe Construction Elements: Khi to cc b mt c bn .

1. M File GettingStartedWireframeAndSurface.CATPart trong document.

2. Nhn chut vo biu tng Line . Khi hp thoi Line xut hin.

3. Dng chut nhn vo im giao gia phn cong v phn vung trn tng chi tit .

4. Tng t vi cc im khc trn hai chi tit.

5. Nhn OK xc nh hon thnh cng vic. Khi bn thu c.

2.1.2.Creating a First Loft Surface: Khi to b mt tm cong.

1. Nhn chut vo biu tng Loft . Khi hp thoi Loft xut hin.

2. La chn hai ng cong trn hai chi tit ban u.

3. Bn cn thay i hng ca mi tn phi nh nhau.

4. Nhn OK xc nh hon thnh cng vic. Khi bn c kt qu.

2.1.3. Creating Two Swept Surfaces: Khi to b mt cong th hai.

1. Nhn chut vo biu tng Swept . Khi hp thoi Swept xut hin.

2. La chn ng thng ng trn chi tit ln lm Profile.3. La chn tip ng thng khi to ban u pha di lm ng dn th nht (Guide Curve).

4. La chn bin dng ng cong va khi to lm ng dn th hai (Guide Curve).

5. Kch OK xc nh hon thnh cng vic. Khi bn thu c kt qu.

6. Lm tng t nh trn vi phn cn li

2.1.4. Joining Surfaces: Ni mt .

1. Nhn chut vo biu tng Join . Khi hp thoi Join xut hin

2. La chn b mt Loft v 2 b mt Swept trn.

3. Nhn chut vo OK. Kh bn thu c kt qu

2.1.5. Closing the Surfaces: Khi to b mt ng.

1. La chn Part Design from the Start -> Mechanical Design t menu.

2. Nhn chut vo biu tng Close Surface . Khi hp thoi Close Surface xut hin.

3.Kch chut vo OK. Khi ta c kt qu.

2.2. Basic Tasks.

Phn ny gii thiu cch khi to cc c tnh hnh hc trong h trc to 3D nh khi to mt im, ng, mt phng mi

2.2.1. Creating Points: Khi to im.

C cc phng php khi to im nh sau:

by coordinates.

on a curve.

on a plane.

on a surface.

at a circle center.

tangent point on a curve.

between.

1. M File Points3D-1.CATPart trong document.2. Nhn chut vo biu tng Point . Khi hp thoi Point xut hin .

3. La chn kiu xc nh im trong khng gian trong phn Point Type hp thoi. V d y bn chn l curve.

4. Nhn chut vo trc tip chi tit trn mn hnh.

5. Tng t nh vy bn hy th vi cc la chn On plane, On surface, circle, circular arc, or ellipse, tangent, between. Trong phn Point Type thy s khc nhau gia chng.

2.2.2. Creating Lines: Khi to ng.

C cc cch khi to mt ng thng sau:

point to point.

point and direction.

angle or normal to curve.

angent to curve.

normal to surface.

bisecting.

1. M File Lines1.CATPart trong document.2. Nhn chut vo biu tng Line . Khi y hp thoi Line xut hin.

3. Nh ni trn bn la chn mt trong cc kiu khi to ng thng trong phn Line Type trn hp thoi. V d y bn chn l Point- Point.

4. Xc nh im u v im cui ngay trn chi tit.

5. Khi bn thu c kt qu.

6. Tng t nh vy hy th vi cc la chn khc thy c s khc nhau gia chng.

2.2.3. Creating Planes: Khi to mt mt phng.

C cc cch khi to mt mt phng nh sau:

offset from a plane

parallel through point

angle/normal to a plane

through three points

through two lines

through a point and a line

through a planar curve

normal to a curve

tangent to a surface

from its equation

mean through points

1. M File Planes1.CATPart trong document.2. Nhn chut vo biu tng Plane .Khi hp thoi Plane xut hin.

3. La chn b mt cn khi to v nhp gi tr khong cch vo trong hp thoi. V d y bn nhp gi tr l 20mm.

4. Kch tip vo biu tng Repeat Object. Mt hp thoi na li xut hin.

5. Nhp gi tr s lng mt phng mun khi to ng thi cng lc vo hp thoi ny. V d y bn nhp gi tr l 10.

6. Nhn OK. Khi bn thu c.

7. Lm tng t nh vy vi cc la chn khc trong phn Pline Type thy s khc nhau gia chng.

2.2.4. Creating Planes Between Other Planes: Khi to nhng mt phng nm gia hai mt phng cho trc.

1. M File Planes1.CATPart trong document.2. Nhn chut vo biu tng Planes Repetition . Khi hp thoi Planes Repetition xut hin.

3. La chn hai mt phng gii hn bng cch nhy trc tip vo chi tit trn mn hnh.

4. La chn s lng mt phng nm gia hai mt phng trn, v d bn nhp gi tr l 7 vo hp thoi. Khi bn thu c kt qu.

2.2.5. Creating Conics: Khi to gc.

1. M File Conic1.CATPart trong document.

2. Nhn chut vo biu tng Conic . Khi hp thoi Conic xut hin.

3. in cc thng s ng cong dng nn tu thuc vo kiu ng cong m ta khi to ban u.

4. Chn mt phng ko di l mt phng xy.

5. Chn im bt u ko di to thnh ng cong l im u ca cnh th nht.

6. Chn tip im cui to thnh ng cong l im u ca cnh th hai.

7. Chn tip hai ng thng vo phn Tangets. 8. Nhp bn knh gc ln vo phn cn li trong hp thoi v d y bn nhp gi tr l 0,5.

9. Nhn OK. Khi bn thu c kt qu.

2.2.6. Creating a Helix: Khi to ng xon dng l xo .

1. M File Helix.CATPart trong document.2. Nhn chut vo biu tng Helix . Khi hp thoi Helix xut hin.

3. La chn mt im lm im bt u v ng lm ng tm cho ng xon.

4. Nhp tip gi tr bn knh ca ng xon v chiu cao bc xon vo trong hp thoi.V d y bn nhp gi tr tng ng l 20mm v 100mm.

5. Nhn chut vo OK. Khi bn thu c kt qu.

2.2.7. Creating Parallel Curves: Khi to nhng ng cong song song.

1. M File ParallelCurve1.CATPart trong document.2. Nhn chut vo biu tng Parallel Curve .Khi y hp thoi Parallel Curve xut hin.

3. La chn ng cong ban u. V d y l Spline.14. La chn tip mt phng hoc b mt lm nhim v dn hng. V d l Fill.1.5. Nhp gi tr khong cch cn khi to ng cong th 2 v hng cn khi to. V d bn nhp gi tr 15mm.

6. Nhn OK, khi bn thu c.

7. Bn cng c th to theo hai hng khi bn nhn vo biu tng Both Sides.

2.2.8. Create extruded surfaces: Ko di b mt khi to.

1. M File Extrude1.CATPart trong document.2. Nhn chut vo biu tng Extrude . Khi hp thoi Extrude xut hin.

3. La chn bin dng b mt cn ko di. y ban u ch l mt ng cong bt k.

4. La chn tip mt phng lm mt phng dn hng cho bin dng b mt trn.

5. Nhp gi tr v kch thc b mt mun khi to v d bn nhp gi tr 20mm.

6. Bn cng c th cho kch thc ca b mt rng theo hai hng.

7. Kch OK xc nh hon thnh cng vic. Khi bn thu c kt qu.

2.2.9. Creating Spherical Surfaces: Khi to hnh cu.

1. M File Sphere1.CATPart trong document.2. Nhn chut vo biu tng Sphere. Khi hp thoi Sphere xut hin.

3. Trong hp thoi c hai cch khi to hnh cu tng ng vi hai biu tng.

4. La chn mt trong hai biu tng trn hp thoi. Khi gi tr cc gc mc nh ngay trn hp thoi. Tuy nhin bn cng c th thay i chng v gc v v bn knh qu cu.

5. Kch OK xc nh hon thnh cng vic. Khi bn thu c.

6. Nu bn la chn biu tng. Khi bn thu c kt qu.

2.2.10. Creating Filling Surfaces: Khi to mt cong t nhng ng cong ban u.

1. M File Fill1.CATPart trong document.2. Nhn chut vo biu tng Fill . Khi hp thoi Fill xut hin.

3. La chn hai ng cong v hai ng thng trn mt phng ngang.

4.Nhn OK. Khi bn thu c kt qu.

2.2.11. Joining Surfaces or Curves: Ghp ni cc b mt hoc cc ng cong

1. M File Join1.CATPart trong document.2. Nhn chut vo biu tng Join . Khi hp thoi Join xut hin.

3. y khng gii hn s lng b mt hoc ng cong l 2. Bn c th chn nhiu hn.

4. Nhn OK. Khi bn thu c.

2.2.12.Performing a Symmetry on Geometry:Khi to chi tit i xng.

1. M File Transform1.CATPart trong document.2. Nhn chut vo biu tng Symmetry . Khi hp thoi Symmetry xut hin.

3. La chn bin dng chi tit cn to.

4. La chn tip im, ng, hoc mt lm i xng.

5. Nhn OK. Khi bn thu c kt qu.

2.2.13. Rotating Geometry: Xoay trn mt bin dng chi tit.

1. M File Transform1.CATPart trong document.2. Nhn chut vo biu tng Rotate . Khi hp thoi Rotate xut hin.

3. La chn bin dng chi tit cn xoay.

4. La chn tip ng thng lm trc quay.

5. Nhp gi tr gc quay vo hp thoi. V d y bn nhp gi tr l 900.

6. Nhn OK. Khi bn thu c.

2.2.14. Extrapolating Surfaces.

1. M File Extrapolate1.CATPart trong document.

2. Nhn chut vo biu tng Extrapolate . Hp thoi Extrapolate xut hin.

3. La chn ng gianh gii Boundary. V d y bn chn ng cong bao ngoi.

4. La chn tip mt cong ngoi suy Extrapolated. V d y bn chn l ng cong u ban u.

5. Nhp gi tr kch thc b mt cong cn ko di. V d y l 60mm

6. Nhn OK. Khi bn thu c kt qu.

2.2.15. Splitting Geometry: Phn tch hnh hc.

1. M File Split1.CATPart trong document.2. Nhn chut vo biu tng Split . Hp thoi Split xut hin.

3. La chn b mt cn phn tch .

4. La chn b mt cn ct i.

5. Nhn OK. Khi bn thu c kt qu.

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