Intro ductio Introduc tion n to the th e Fre Freestyl estyle e Surf urface ace Modeling Process Module Overview: This tutor This oria iall is an ov over erv vie iew w of the fr free eeffor orm m su surrfac ace e mod odel elin ing g and su surrfa face ce mod odel elin ing g par ara adig igm ms use sed d within with in Creo C reo Param P arametric. etric. You Y ou also also learn how the freeform paradigm paradigm can be broken into the Style Style and Freestyle tools. Since the Freestyle tool is the focus of this module, you learn about the freestyle modeling process.
Objectives: After successfully completing this module, you will be able to: Understand and describe describe freestyle surface modeling. Understand and describe the surface modeling paradigms paradigms used used in Creo C reo Param P arametric. etric. Understand and describe a typical Creo C reo Param P arametric etric freestyle freestyle modeling process process..
Concept: Intro Concept: ntroduct duct ion to Free Freeform Surface Modeling Introducti on to Fre Freeform eform Surface Modeling Modeling Freeform surface modeling enables you to design models that have: Geom Geo metric shapes with high curvatures, curvatures, or o r curvature curvature in two directions. Fluid, sculpted, or organic shapes. Shapes that are difficult or impossible to design using parametric surface features. Smooth shapes with tangent or curvature continuity.
Figure 1, Figure 2, and Figure 3 are examples of models that you can create using freeform surface modeling techniques.
Figure 1 – Motor Motor cycl e Helmet Helmet
Figure 2 – Water Faucet
Common Freeform Surface Modeling Scenarios The following are standard scenarios in which freeform surface modeling yields better results, since it requires interactive modeling: Your colleague has developed a foam model of a product shape. Y ou create a model that matches the mock-up. You receive an e-mail attachment with the concept sketches of a molded suitcase. You develop a Creo Parametric model. You have drawings of an automobile mirror with views and sections. You create a digital model of the mirror. The internal components of a Personal Digital Assistant (PDA) are known. You intuitively create the body design. You design a toy based on the data available in IGES form.
Concept: Understanding Surface Modeling Paradigms Understanding Surface Modeling Paradigms There are two surface modeling paradigms in Creo Parametric: Parametric surface modeling: o Parametric surface modeling uses techniques similar to solid modeling. Creates surface features that are ultimately driven by dimensions, parameters, or o mathematical equations.
Figure 1 – Inner Door Panel
o
Parametric surface modeling forms the basis for the other surface modeling course: Surfacing using Creo Parametric.
Freeform surface modeling: Creates surface features that are driven by intuition, feel, and aesthetic requirements. o
Figure 2 – Outer Door Panel o
Freeform surface modeling, which forms the basis for this course, has two available applications: Style Less parametric control over the geometry. Style curves and surfaces used to create the geometry. Style curves can be manipulated and refined to complete the stylized geometry. Freestyle No parametric control over the geometry. Start with a primitive shape, such as a sphere or cube. Manipulate entities of a control mesh to transform the primitive shape into the stylized geometry.
Selecting a Surface Modeling Paradigm Both of these approaches can deliver the required surface model shape. You can select a suitable approach based on the following factors: The design input: o Hard data and dimension values. Sketches or conceptual drawings. o The design intent:
o
o
Designers with industrial design or artistic backgrounds may prefer the Style or Freestyle tools. Designers with no understanding of surface patch structures may prefer using the Freestyle tool.
Concept: Typical Freestyle Surface Modeling Process Import an Image as a Reference
Figure 1 – Import an Image as a Reference
This step in the process is optional, but using a sketch as a reference helps define key characteristics of your design. You can use the sketch to define overall relative size, the location of edges, openings, creases and so on.
Insert a Prim iti ve Shape
Figure 2 – Insert a Primiti ve Shape
The Freestyle tool provides you with a set of 2-D and 3-D primitive shapes, such as circles, spheres, cubes, and so on, which are used as the starting point for the design. Once placed in the model, a primitive shape can be scaled to fit relative to the imported conceptual sketch.
Manipulate the Prim iti ve Shape
Figure 3 – Manipulate the Primit ive Shape
The primitive shape has a control mesh surrounding it The mesh elements can be manipulated by
Ad d Cr eases and Other Featur es to Comp lete the Model
Figure 4 – Add Creases and Other Features t o Complete th e Model
Once the general shape is complete, you can add finishing features such as creases, rounds, thickness, and so on to complete the geometry.
Procedure: Freestyle Process Exercise Objectives Import an image as a modeling reference. Insert a primitive shape as a starting point for the model. Manipulate the control mesh surrounding the primitive to create the stylized shape. Add creases, rounds, and other features such as the thicken feature to complete the model. You have been provided a graphic that represents a design for a detergent bottle. You will take that 2-D image, import it, and create a 3-D model.
Task 1. Open the model and import an image for reference. 1. Open the BOTTLE.PRT part model.
Click Open in the ribbon. In the File Open dialog box, click Working Directory . Double-click Process, right-click the Freestyle-Process folder, and select Set Worki ng Directory. Double-click the Freestyle-Process folder to view its contents. Select BOTTLE.PRT and click Open .
2. Enable only the following Datum Display types:
3. Insert a graphic to use as a reference. Select the View tab. Select Images from the Model Display group drop-down list.
Click Ad d from the Image group. Select datum plane FRONT from the model tree. Click Working Directory in the Open dialog box, then doubleclick BOTTLE.J PG.
Figure 2
4. Select FRONT from the Named Views toolbar.
list in the In Graphics
5. Click Fit from the Fit group. 6. Select Vertical. 7. Drag the ends of the scale marker to the position shown.
8. Double-click the scale dimension and edit the value to 250. 9. Click Fit to disable it. 10. Move the section to the position shown. 11. Click OK
.
Figure 4
Task 2. Start a style feature and add a primitive shape to the model. 1. Select the Model tab. 2. Click Freestyle
from the Surfaces group.
3. Select Sphere from the Primitives group drop-down menu. 4. Drag a selection box around the control mesh. 5. Click Scale from the Manipulation group. 6. Press CTRL and drag the red handle until the model appears as shown.
Figure 5
7. Disable Csys Display Plane Display . 8. Press CTRL+D to return to standard orientation.
Task 3. Transform the geometry to create the shape. 1. Select the right face, then right-click and select Extrude from the circular menu. 2. Drag the green handle to the left. 3. Select one of the top surfaces, then press CTRL and select the other surface. 4. Right-click and select Extrude . 5. Drag the blue handle to the position shown.
Figure 6
6. Select the edge shown.
7. Select 1 Split from the Edge Split types drop-down menu. 8. Select the bottom-right surface, then right-click and select Extrude . 9. Select the upper-right surface, then right-click and select Extrude
.
Figure 8
10. Select the surface shown and drag it down.
Figure 9
Figure 10
12. Drag the blue handle up to the position shown.
Figure 11
13. Select the surface shown and drag it to the position shown.
14. Select the right face, and rotate and drag it to the position shown.
Figure 13
15. With the previous surface still selected, press CTRL and select the surface shown.
Figure 14
16. Right-click and select Connect
from the circular menu.
Figure 15
Task 4. Tweak the geometry to better fit the sketch. 1. Select FRONT from the Named Views list in the In Graphics toolbar. 2. Drag a selection box around the vertex, making sure that you include the upper right vertex. 3. Drag the center of the drag handle to move the geometry to the position shown.
Figure 16
4. Drag a selection box around the two vertices on the far right of the handle to select the entire right face. 5. Drag the face to the position shown.
6. Drag a selection box around the bottom three vertices to select the bottom surfaces. 7. Drag the surface to the position shown.
Figure 18
8. Drag a selection box around the four left vertices. 9. Drag the surface to the position shown.
Figure 19
10. Drag a selection box around the upper-right corner. 11. Drag the center of the drag handle to move the vertex to the position shown.
12. Drag a selection box around the top three vertices. 13. Rotate the surface slightly, then drag the selected vertices to the position shown.
Figure 21
Task 5. Scale the width of the bottl e body and handle. 1. Rotate the model as shown. 2. Press CTRL and select the additional five surfaces shown. 3. Click Scale from the Manipulation group. 4. Drag the green handle to increase the width to the position shown.
Figure 22
5. Rotate the model as shown. 6. Select the right surface of the handle and use the blue drag handle to scale it as shown.
Task 6. Add a crease to th e model for locating the label. 1. Rotate the model as shown. 2. Press CTRL and select the three surfaces shown. 3. Click Scale if necessary. 4. Drag the blue handle to provide enough space for the label.
Figure 24
5. With the three surfaces still selected, select 25% from the Face Split types drop-down menu. 6. Select the upper edge, press SHIFT and hover over the same edge until the chain highlights, then select the chain.
7. Press CTRL, select the lower-top horizontal edge of the label area, then also press SHIFT and hover over the same edge and right-click until the correct chain highlights, then select the chain.
Figure 26
8. Right-click and select Crease . 9. Select the three surfaces of the inner portion of the label area. 10. Click Scale if necessary. 11. Drag the red and green handles until the model appears as shown.
12. Select the top front surface and scale it using the planar handle, as shown.
Figure 28
13. Select the top two surfaces. 14. Type 50 in the Alter the amount of crease field of the Crease group in the ribbon. 15. Select Soft.
Figure 29
16. Select the bottom two surfaces. 17. Type 75 in the Alter the amount of crease field of the Crease group in the ribbon. 18. Select Soft if necessary. 19. Click OK to complete the freestyle feature.
Task 7. Add f eatures to compl ete the model. 1. Select the edges shown.
Figure 31
2. Click Round . 3. Edit the radius to 5 and click Complete Feature
.
4. To create the spout, click Extrude from the Shapes group. 5. Select datum plane TOP from the model tree. 6. Select TOP from the Named Views
list in the In Graphics toolbar.
7. Click Center and Point from the Sketching group. 8. Sketch the circle approximately as shown.
10. Select FRONT from the Named list in the In Graphics Views toolbar. 11. Edit the height of the extruded feature to 215. 12. Click Surface from the dashboard. 13. Click Complete Feature . 14. Press CTRL+D to return to standard orientation. Figure 33
15. Select the extrude feature, then press CTRL and select the freestyle feature. 16. Click Merge . 17. Click the bottom arrow so that it points outward toward the bottle.
18. Click Complete Feature . 19. Add a round with a radius of 5 to the edge between the spout and the bottle.
Figure 35
20. Click Complete Feature
.
21. Edit the selection filter in the lower-right corner from Smart to Quilts . 22. Select the bottle. 23. Click Thicken . 24. Edit the value to 0.5.
