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Mining and Power Engineering

Janusz Skrzypacz

CAD/CATIA

Project co-financed by European Union within European Social Fund

THE DEVELOPMENT OF THE POTENTIAL AND ACADEMIC PROGRAMMES OF WROCŁAW UNIVERSITY OF TECHNOLOGY

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CAD/ CATIA

LECTURE 7

Part creation by a profile extrusion along a non-linear trajectory (4h)

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When it is necessary to create a part by profile extrusion along non-linear trajectory, the Rib

function has to be used. Two profiles are obligatory for the Rib function:

A profile, which can be an open or closed loop sketch.

A center curve, which can be open or closed and acts as the trajectory for the profile. It can

be created as a sketch or tangent continuous 3D wireframe element.

The Dialog box of Rib function is presented on the picture 1. The profile control options are shown in

the figure 2 and described below.

The Slot function works in similar way to Rib but this one removes material from solid (fig.4).

The Dialog box and all functions are identicall as in case of Rib function.

Fig.1 An example of an application of the Rib function

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Fig. 3 The Dialog box of the Rib function

Profile control options can be used to help control the rib or slot. The profile of the feature is controlled using the options from the Profile control pull-down menu.

The Keep Angle option maintains a constant angle between the profiles sketch support and the tangent of the center curve.

The Pulling Direction option causes the profile to be swept along the center curve with respect to a specified direction. The direction can be defined using a plane or an edge.

The Reference Surface option causes the profile to remain at a constant angle to a selected reference surface.

Fig.4 An example of an application of the Slot function

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When a Center Curve must be a complex curve (e.g. helix) , it is necessary to use Generative Shape

Design module (menu Start ==> Shape). User can switch between modules every time. In order to

define a helix curve, it is recommended to create two sketches (first define an axis of helix, second

define start point of helix) before Helix function would be selected (fig.5).

Fig. 5 An example of the sketches definition for a helix creation process

Helix function can be found in Curve Toolbox . The helix creation process and the Dialog box is

presented on the picture 7.

When the helix will be center line of the spring, it is necessary to sketch a spring profile that should

be located at the plane perpendicular to the helix at the starting point (fig.9). Definition of a such

plane is shown on the picture 8. Figure 9 presents an example of Rib function application to create a

Spring solid with usage helix as a Center Curve and profile located on the plane defined on the

picture 8.

Fig. 6 Functions collected at the Curve Toolbox.

Sketch for the axis definition

Sketch for the staring point

definition

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Fig. 7 An example of the helix creation process

Fig. 8 An example of plane definition with option: Normal to curve

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Fig. 9 The Rib application to define the Spring solid.

EXERCISES

Exercise 1

According to figure 10, create the part of the elbow with flanges.

Exercise 2

Create the Spring for the following parameters:

Wire diameter d = 5 mm,

Spring average diameter Dav = 50 mm,

Pitch p = 10 mm,

Spring height H = 55 mm.

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Exercise 3

Using the parts of the bolt and the nut from Lecture 5, create the Thread by usage Slot function

(fig.11). The thread parameters you can find below or in the internet (e.g.

http://www.pg.gda.pl/~wlitwin/pkm/gwinty%20metryczne.pdf)

Hint: Center Curve must be defined as Helix. Slot option has to be selected with Pulling Direction.

Fig. 11 The parts of the bolt and the nut with Thread made by Rib function.

Fig. 12 The thread parameters.

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