Welcome to Solid Edge University 2015

Transcription

1 #SEU15 Welcome to Solid Edge University 2015 Realize innovation.

2 Surfacing: A Hands-on Experience Solid Edge isn t just a great tool for typical machinery design; it s also very powerful when it comes to creating complex shapes, like those found in consumer products. To show you Solid Edge s capabilities we re going to redesign the rear panel of an Actifry deep fryer from one of our French customers, Groupe SEB. I m sure you ve heard of their brands Rowenta, Moulinex, Krups, and Tefal. An industrial designer has come up with an aesthetically pleasing and functional design modification to the rear panel and we will use those sketches to redesign the panel using Solid Edge s powerful surfacing capabilities. Page 2

3 SEB Surfacing enhancement in SOLID EDGE ST6 have enabled us to create some models 40% faster compared to other CAD systems Olivier Pellerin IT Innovation Manager Page 3

4 Surface Modeling Surface based features Edges Rule Curves a major part of model definition. Highlight lines Silhouette edges, flow lines But surface shape is still important Edges and faces are mainly Bspline based. Typically start with a wire frame and add surfaces. Aesthetics is primary concern, function is secondary. Page 4

5 Surface Modeling A Surfacing Approach Exact edge control. Edges are NOT just the result of extrudes and cuts. Edges are developed through character curves. Page 5

6 Surface Modeling Character Curves Hard Edges Actual edges used to help define the flow of a surface. Typically curves are of importance for aesthetic definition. Soft Edges Horizon edges are typically visible from front, top, and end views. Important in defining the overall shape of the model. Soft Edges Hard Edges Page 6

7 Creating Curves 2D Curve Bspline Curve created on a sketch plane. Creating by clicking 3 or more points adds edit points and control vertices. Click and drag to define a freehand curve adds only control vertices. Keep it simple! Less edit points make the curve easier to adjust into smooth shapes. Page 7

8 Creating Curves Curves can also be defined by: Cross Curves which are created by projecting 2 curves and determining their intersection for a resulting curve Intersecting surfaces Projected sketches onto a surface Contour curves Sketching a curve directly onto a surface Page 8

9 Curvature: Solid Modeling vs.- Surface Modeling With traditional solid modeling, designers typically use sketch elements like lines and arcs to define extrusions and cuts in a solid model. Sketched fillets and rounds are tangent to lines and other arcs. You can t define curvature in the sketch element unless using Bspline curves. Page 9

10 Curvature: Solid Modeling vs.- Surface Modeling The result is reflections that have abrupt changes and it is clear to see where the curvature changes from one patch to the next. Page 10

11 Curvature: Solid Modeling vs.- Surface Modeling If this model was created using surface modeling techniques with curvature continuous 2D and 3D curves, the result is much more appealing! Page 11

12 Typical Workflows Use 3D curves to develop surfaces. Some additional 3D curves are obtained from surfaces. It is common to use Strip Surfaces to ensure continuous curvature across the mid-line on symmetric parts. Over-Building surfaces is also common to extend, trim and intersect surfaces to get the final design. Strip Surfaces Page 12

13 Techniques It is very difficult to model 100% accurately to the exact numbers for the curves at intersecting surfaces. It is typical, and more reliable, to overbuild surfaces and trim them back to each other, rather than determine the exact curve at the intersection and build surfaces from there. A surface that is too small is difficult to work with, but a surface that is too large, once trimmed, is never a problem. Making a surface larger than it needs to be helps to prevent extra edges from showing up in the model. One thing that gives surface modelers the most problems is building smooth transitions between faces and across edges. The best way to eliminate this difficulty is to eliminate the edges as much as possible. Page 13

14 Workflow REMEMBER - Every surface coming from an Industrial Design is not necessarily critical to the overall design. A tiny blend in this example has been modeled with many curves. There are some basic practices that are used for most surface model designs. Break the model up into as few surface patches as possible. Never surface model fillets, rounds and non-critical small blends. Let the software do what it is good at: Let Parasolid handle these once you have a solid model. Page 14

15 Techniques Surface modeling is a lot more work than solid modeling. Surface modeling forces you to work face, by face, by face, and faces must be manually fit together. These actions are all performed automatically in solid modeling. Where surfacing techniques become beneficial is in situations where solid modeling becomes clumsy or inefficient, or when a given modeling task is simply impossible with solids. Leave out detail that can be modeled later using solid modeling features. This is easier and with far less features in the solid. LETS GET STARTED! Page 15

16 Surfacing Open PJ857 ACTIFRY 1,5yp.asm from the Actifry folder Change the config to 01-Interior Components. Rotate to the back to see the Fan assembly. Change the config to 00-All. Note the new fan design is protruding through the back panel. Page 16

17 Surfacing Change the config to 02-Industrial Design Sketches. Note: The Industrial Designer has come up with an ergonomic solution for the interference problem. Cycle through the Front and Top views using the view cube to see the sketches. Page 17

18 Surfacing Select the rear panel and Edit-in-place ( d.par). If not displayed, CTRL+Q to show the ID sketches. Create a Sketch on the Top plane. CTRL+H to orient to a sketch plane view Zoom and pan to the part where we will add the feature to remove the interference. Page 18

19 Surfacing Start a 2D curve at about the center plane. Click and hold + drag a curve to match the top ID sketch. Holding the left mouse button down as you drag the curve prevents adding keypoints which can affect editing it to match the ID sketch correctly. Connect the endpoint to the Front plane. Page 19

20 Surfacing Increase the Degree of the curve to 5 Add a horiz/vert relationship to the first control vertex. Tweak the control vertices to match the curve. Exit the sketch. Page 20

21 Surfacing Rotate the model Show the Upper and Lower sketches at the bottom of the feature list. These were created parallel to the Top plane and relative to the top and bottom of the new feature in the industrial design sketch. Right click on the last Sketch feature in PathFinder and select Multi-Color Sketch Display Page 21

22 Surfacing Start a new Sketch on the Front Plane. CTL+H to transition to the sketch plane Zoom and pan to the part where we will add the feature to remove the interference. Select the Curve command from the radial menu. Holding down the ALT key through the entire process, left click and drag a curve matching the ID sketch. The ALT key keeps it from attaching to points as you are creating it. Page 22

23 Surfacing Connect the top and bottom endpoints to the Upper and Lower Sketches that you displayed earlier. Tweak the control vertices to best match the ID sketch. Exit the sketch. Page 23

24 Surfacing Right click on the last Sketch feature in PathFinder and select Multi-Color Sketch Display CTRL+Q to hide the Industrial Design sketches. Use BlueDot to connect the endpoint of the top view sketch and the one you just created. NOTE that BlueDot connects the sketches and is not dependent on creation order. Page 24

25 Surfacing Create an Extruded surface using the Front profile sketch curve. This is a strip surface used for construction. Hide the last sketch and All BlueDots. Page 25

26 Surfacing Create a BlueSurf between the Upper sketch, middle sketch and the Lower sketch. Use the edge of the strip surface as a guide curve. Change the tangency option to Tangent Continuous with the strip surface. If this is not available you had missed the step to hide the first 2D curve. Hide all sketches, curves and the extruded strip surface. Page 26

27 Surfacing From the Inspect tab turn on the Reflective Plane. Show the Rear Profile Sketch. Project this sketch onto the BlueSurf. Hide sketches. Turn off the reflective plane Page 27

28 Surfacing Trim the BlueSurf with the Projected curve. Select the face to remove. Hide curves. Page 28

29 Surfacing Mirror the surface about the Front plane. Stitch the surfaces together. Use default settings and dismiss the dialog. Page 29

30 Surfacing Use the Ruled surface command to generate a ruled surface around the perimeter of the surface body. Use the Taper to plane option. Select the Right plane to taper to. Set the length to mm and the taper angle to Page 30

31 Surfacing Hide all Ref. Planes Create a Surface Blend with a Constant Width between the ruled surface and the stitched surface mm radius. Point the arrows toward the inside of the part. 2x Page 31

32 Surfacing Create a Bounded surface to cap the ruled surface. Stitch the surfaces together. This creates a construction solid. Page 32

33 Surfacing Run the Emboss command. Select the part as the target to emboss. Select the construction solid as the tool body. Flip the side for the embossed feature. Accept the default thickness of 2.50 mm. Page 33

34 Surfacing Run the Round command. Press CTRL+Shift+D to disable dynamic preview as you select edges to round. Add a 5.00 mm round to convex side of the embossed feature (4 edges). Preview and finish but stay in the round command. Page 34

35 Surfacing Rotate the model and add a 7.00 mm round to the edges of the convex side of the feature. Dynamic preview is still disabled (5 edges). Finish the command. Save the model and Close and Return to the top level Assembly Page 35

36 Surfacing Change the display configuration to 03-No Lid Page 36

37 Surfacing Pan and zoom to the handle shroud ( A.par). Select the shroud and Edit in place. Note the broken up individual faces. Increase the sharpness to 4 or 5 Page 37

38 Surfacing From the inspect tab, display the Zebra striping to show the C1 edges Abrupt changes in direction. Run the Redefine surface command and select 6 individual top surfaces. Enable Replace faces on solid body. Change the common tangency option to Tangent Continuous and note the smooth transitions on edges and internal to the selection. Page 38

39 Surfacing Turn off the Zebra striping Change the sharpness to 3. This will speed up display as you return to the assembly as it would attempt to sharpen every curve in the assembly. Close and return to the top level assembly. Save and close the Assembly Page 39

40 Surfacing Free Styling! Let s Get Creative! We have the design of a simple ballpoint pen cap. The Goal: Use Surface Modeling to create an aesthetically pleasing and functional transitional housing from the basic Pen Cap for a Micro USB Drive. Page 40

41 Surfacing Free Styling! Open USB-PEN_Design.par from the Pen Cap Exercise folder. Show the Construction body (USB Drive) and the sketch by checking their display option in the PathFinder. Page 41

42 Surfacing Free Styling! The Plan: We will create planer sketches in the Front and Right views to define what the transition should look like. The existing sketch represents the rectangular size/shape we will transition to. Show the Front and right Reference Planes from the PathFinder. Page 42

43 Surfacing Free Styling! Because surfaces are driven and reliant on sketches and curves, surface modeling is done in the Ordered mode to preserve the history of these elements. Right mouse click in space and select Transition to Ordered Start a sketch. Create an offset Parallel Plane from the Right reference plane. Offset about 25 mm Page 43

44 Surfacing Free Styling! Transition to a sketch plane view by pressing CTRL+H. Select the Curve command from the Draw Group on the Home tab. Start the curve by clicking the endpoint of the top sketch and then click-and-drag a curve down to the inside of the pen body. When picking the ending point, stop short of the centerline and do not connect to the centerline. Press and holding the ALT key prevents connecting to any background geometry inadvertently. Page 44

45 Surfacing Free Styling! By using the click-and-drag curve creation method we end up with about 4 control vertices. Let s increase the control by increasing the degree of the curve from 3 to 4. Using the Horizontal/Vertical relationship, create a vertical relationship between the starting endpoint and the first control vertex. This guarantees the start of the curve to be perpendicular to the plane of the rectangular sketch. Page 45

46 Surfacing Free Styling! Adjust the curve by dragging the control vertices around. If you want more control you can always go back and increase the degree of the curve incrementally to add another control vertex to adjust. Select the curve and mirror about the center plane. Close out of the sketch. Page 46

47 Surfacing Free Styling! Next we will repeat this process to define the shape we want from the Front view. Create a new Sketch and define a Parallel plane from the Front reference plane. Offset about 25 mm. Transition to a sketch plane view by pressing CTRL+H. Page 47

48 Surfacing Free Styling! Just like before, select the Curve command from the Draw Group on the Home tab. Start the curve by clicking the endpoint of the top sketch and then click-and-drag a curve down to the inside of the pen body. Finish the curve roughly close to alignment with the first curves Page 48

49 Surfacing Free Styling! Like before, increase the degree of the curve to at least 4 to add more control. Create the vertical alignment between the starting endpoint nd the first control vertex. Tweak the curve to you liking. Page 49

50 Surfacing Free Styling! Once again, mirror the final curve about the center plane. Finish the sketch. Hide the reference planes. You now have profiles of what you would like the new area to look like from the front and right views Page 50

51 Surfacing Free Styling! The next step is to find the resulting 3D Cross curves from the intersections of the these 2D curves. Basically think of it as projecting a surface from each curve and the intersection of these surfaces would be the resulting cross curve. Page 51

52 Surfacing Free Styling! From the surfacing tab, click on the Cross curve command. Select one curve from each profile to get the resulting curve. Repeat this process until you have all 4 Cross curves generated. Page 52

53 Surfacing Free Styling! Hide the 2D curve sketches. Next we will create surfaces (4) between the curves using the BlueSurf command. Hide all sketches and curves. Page 53

54 Surfacing Free Styling! Create a Bounded surface on the top using the edges of the surfaces. Set selection option to Single. Stitch the 5 surfaces together. Add a 2.00 mm round to each corner Page 54

55 Surfacing Free Styling! If you rotate the model and look inside the cap, you will see that the surfaces extend through the cap. In order to successfully add this geometry, it will need to be trimmed. Copy the inside surface of the cap. From the right click context menu, Hide the Design Body. Page 55

56 Surfacing Free Styling! Using the Intersect command, select the 2 surface bodies. Select the area inside the copied cap surface to remove. Select the extending copied surface to trip it back to the stitched surface. Stitch the surfaces together to form a new construction solid. Page 56

57 Surfacing Free Styling! Now lets turn on the 2D Sketches and tweak the shape of this design. Show the 2 sketches under the Ordered header. Select a sketch and click Dynamic Edit. Tweak the curves using the control vertices and the watch the solid dynamically update to the changes. Caution: Avoid making extreme radical tweaks as it will slow down recalculation and may fail if surfaces overlap. Page 57

58 Surfacing Free Styling! Rename the new construction solid to USB Housing. Toggle the Construction Body to a Design Body. Double click to make it the Activate body. Check the box to show the Pen Cap body also. SAVE the part file Page 58

59 Surfacing Free Styling! You may also wish to change the size of the top rectangle. Show the Synchronous sketch. Edit the length dimension and/or width dimensions and again the solid will react. Hide the sketches Page 59

60 Surfacing Free Styling! Let s add a lip to the top face. Extrude and offset profile from the edge of the top face. Use Project to Sketch with the Offset option in the profile. Use Single Face to pick the outer edges and offset to the outside 1.00 mm. Extend up 2.00 mm. Page 60

61 Surfacing Free Styling! Add 1.00 mm rounds to the edges of the extrusion. After that, add another 1.00 mm round where those intersect the main body. Page 61

62 Surfacing Free Styling! Now let s subtract the USB Drive body from the housing. Select the Housing as the Target. Select the USB Drive as the Tool. Making the Pen Cap the Active body shows how the parts fit together. Select the Move Faces command to increase the size of the pocket for the PCB components on the Micro USB Drive. Page 62

63 Surfacing Free Styling! Finally let s unite the Pen Cap body with the USB Housing body to make them one. Select the Pen Cap as the Target. Select the USB housing as the Tool Add a 1.00 mm round to the intersecting edge. Use Edge/Corner option and fence select the edge. Make the round larger: mm Change to Shaded view to see how it will really look. Page 63

64 Surfacing Free Styling! Toggle the USB Drive to a Design Body. Save the Part file again. Now lets Publish the 2 Design Bodies into an Assembly of the Pen Cap and the Micro USB Drive. Select Multi-body Publish command and make sure the option is chacked to build the assembly, The Path and filenames leave as default. Click Save Files Page 64

65 Surfacing Free Styling! From the publish dialog box, double click the assembly at the bottom to open it in Solid Edge and see the final product. CONGRATULATIONS! Your design is complete! Page 65

66 Contact Doug Stainbrook Global Technical Business Development Mainstream Engineering/ Inc. Digital Factory Division 675 Discovery Drive Huntsville, AL United States Tel. :+1 (256) Fax :+1 (256) Mobile :+1 (256) Realize innovation. Page 66