Modelarea solidului compus

Modelarea solidului compus

1-Extrudarea cercurilor orizontale

Se incepe prin modelarea celor doua volume conice verticale ,exterior si interior-vezi anexa 1.

Comenzi utilizate:

Command:Circle

Specify center point for circle or[3P/2P/Ttr(tan tan radius)]:0,0

Specify radius of circle or[diameter]:52/2

Command:Circle

Specify center point for circle or.:0,0

Specify radius of circle or[Diameter]<24,5000>:40/2

Command:Extrude

Current wire frame density:ISOLINES=4

Select objects:se selecteaza cele doua cercuri

2 found

Select objects:<ENTER>

Specify height of extrusion or [Direction/Path/Taper angle]:t

Specify angle of taper for extrusion<0>:-10

Specify height of extrusion or.:138

2Crearea partilor orizontale

Se trece acum la modelarea volumelor orizontale,exterioare si interioare,din componenta piesei.

Pentru modelarea portiunii hexagonale,se modifica sistemul de coordinate,mutandu-l mai intai cu originea in capatul axei orizontale si apoi rotindu-l in jurul axei Y,pentru a adduce directia axei Zin lungul axei orizontale a piesei.Inainte de aceasta insa,actualul UCSse salveaza sub numele de UCS1.

Command:UCS

Current ucs name:*NO NAME*

Specify origin of UCS or .<World>:s

Enter name to save current UCS or [?]:UCS1

Command:UCS

Current ucs name:UCS1

Specify origin of UCS or    . <World>:81,0,69

Specify point on X-axis or <Accept>:<Enter>

Command:UCS

Current ucs name:*NO NAME*

Specify origin of UCS or . <World>:y

Specify rotation angle about Y axis <90>:-90

Command:Poligon-vezi anexa 4

Number of sides<4>:6

Specify center of    polygon or [Edge]:0,0

Enter an optio[Inscribed in circle/Circumscribed .]<|>:<ENTER>

Specify radius of circle:86/2

Command:Extrude(se extrudeaza profilul hexagonal) vezi anexa 4

Current wire frame density:ISOLINES=4

Select objects to extrude:se selecteaza hexagonal

1 found

Select objects:<Enter>

Specify height of extrusion .:29

Se genereaza apoi trei volume cilindrice:cilindrul exterior de diametru ø71 si inaltime 81 si cilindrii interiori de diametre ø67 si ø58,cu inaltimile 23,respectiv 81-vezi anexa 5

Command:Cylinder

Current wire frame density:ISOLINES=4

Specify center point for base or[3P/2P/Ttr/Elliptical]<0,0,0 >:<Enter>

Specify radius for base of cylinder or [Diameter]:71/2

Specify height or[2 Point/Axis endpoint]:81

Command:Cylinder

Current wire frame density:ISOLINES=4

Specify point for base or[3P/2P/Ttr/Elliptical]<0,0,0>:<Enter>

Specify radius for base of cylinder or [Diameter]:67/2

Specify height or[2Point/Axis endpoint]:81

Command:Cylinder

Current wire frame density:ISOLINES=4

Specify center point for base or[3P/2P/Ttr/Elliptical]<0,0,0>:<Enter>

Specify radius for base of cylinder or [Diameter]:58/2

Specify height or [2Point/Axis endpoint]:81

Datorita simetriei,volumele orizontale din partea opusa se pot construe prin comanda Mirror3D-Planul de simetrie este parallel cu planul XOY al UCS-ului current si este situate la dispozitia de 81 de unitati de acestea-vezi anexa 6.

Command:Mirror3d

Select object:se selecteaza cele trei volume cilindrice,impreuna cu volumul hexagonal,create anterior.

4 found Select objects:<Enter>

Specify first pointof mirror plane or.[./XY/.]<3 points>:xy

Specify point on XYplane<0,0,0>:0,0,81

Delete source objects?[Yes/No]:<Enter>

3Aplicarea operatiilor logice pentru extragerea gaurilor

Prin combinarea solidelor create,se obtine solidul compus.

Pentru inceput,se unesc volumele exterioare-trunchiul de con vertical mare,cele doua prisme hexagonale si cei doi cilindri de diametre 71øsi ø58-vezi anexa 8

Command:Union

Select objects:se selecteaza volumele exterioare

5 found

Select objects:<Enter>

Apoi se extrag din volumul creat prin reuniune volumele interioare-trunchiul de con vertical interior,cei doi cilindrii de diametre ø67si cei doi cilindri de diametre ø58

Command:Subtract

Select solids and regions to subtract from..

Select objects:se selecteaza volumul exterior

1 found Select objects:<Enter>

Select solids and regions to subtract.

Select objects:se selecteza volumele interioare

1 found Select objects:5 found

Select objects:<Enter>

4Finalizarea desenului 3D

In final se tesesc cei doi cilindri interiori de diametre 58ø-vezi anexa 9

Command:Chamfer

(TRIM mode)Current chamfer Dist1=10.0000,Dist2=10.0000

Select first line or.:se indica muchia care va fi tesita

Base surface selection.

Enter surface selection option[Next/OK(current)]<OK>:se indica suprafata exterioara F1

Specify base surface chamfer distance<0.0000>:2

Specify other surface chamfer distance<0.000>:2

Select an edge or[Loop]:se indica muchia care va fi eliminate prin tesire

Select an edge or[Loop]:<Enter>

Se repeat comanda pentru fata simetrica F2