高级建模技术

Advanced Modeling TechniquesMark Biasotti CAD Discipline LeadMain Form vs. Localized featuresMain FormLocal FeatureRobustness, Shelling etc.Chances are this will NOT ShellChances are this WILLTrue Hybrid Surface/Solid ModelingAbility to go from Solid bodies to Surface bodies back to Solid bodies in same part file.Add Split Line Delete Face Add SurfaceSolid Solid Surface SurfaceMake SolidSolidImporting Design IntentCurves – Importing Design Intent§ 2D reference Profiles of Front, Side § Brought into part via import geometry and placed on sketch planeTIPS For Importing Design Intent1) Use DXF import to a drawing or IGES import to a sketch. 2) Setup up reference sketches of this imported geometry at the beginning of your part that represent the Front, Top, Side of the Design. 3) Use the Modify Sketch tool to position the import sketches. 4) Use Tools/Sketch Tools/Insert Picture when no “hard” geometry exists.C1 TangencyCurvature Plot shows rateof curvature at section ofsurfacesC2 ContinuityNo “Radii”used; all C2connection of surfacesCurve and Surface Analysis Open GL Shading PhotoWorks Shading Face CurvatureFace Zebra Stripes (intersection curve)Inspect Curvature(intersection curve)Multiple edges as a result of the cutSolidWorks switches side of cut along existing split line edge and alternates the side of cut to remove SolidWorks switches side of cut along existing split line edge and alternates the side of cut to removeSolidSolidSurface SolidSurfaceAdd Split LineDelete FaceAdd Surface Make SolidResolving AmbiguityUse Replace Face instead of Knit-thickenSurface Features in SolidWorksLoft Sweep FillPlanar ShapeExtrude Revolve C2 Fillets2D Sketch Curves§Spline sketch entity§Inspect Curvature Plot Dynamically§Moving Frames for “tweaking”internal points along the splineCurvature PlotMoving FrameSketch Profiles for Surfacing§ Multiple arc segments § No Continuity § More edges in surface § Profile more susceptible to failureSketch Profiles for Surfacing§ A few or one spline elements §Continuity §Fewer Interim ISO lines §Profile less susceptible to failure2D Sketch CurvesFit Spline Function automatically overlays single Spline entity onto existing sketch Elements.Arc segment sketchFitted Spline Function2pt Sketch SplineWhen to use Fill over Loft3 Sided Loft will not offset because of degenerate vertex between common loft profile vertices. Using LoftUsing Fill degenerate vertexLoft with Guide Curve TangencyProfile 1 (with Tangency Guide Curve 4 (with Tangency) Guide Curve 3 (internal) Guide Curve 2 (internal) Profile 2 (with Tangency Guide Curve 1 (with Tangency)Using Fill Different methods –Loft to Point Loft between profile and sketch Point.Key is making sketch point “normal toprofile.Sketch Point (tangency normal toprofile that sketch point plane wascreated)Guide Curves (4ea.)Sketch ProfileDifferent methods –Loft 3 Profiles Loft between three sketch profiles; allwith common end vertices.Profile 2Guide CurveProfile 3Profile 1GuidesSweep profile thru 2 guides to tangent end point Guide Curve 1Path ProfileProfile is swept to a point by Guide curves Guide Curve 2Guide Closed loop Sweep profile thru 2 guides to tangentend pointPath ProfileProfile is swept aroundcircular path and followsGuide curve 1Guide Curve 1Different methods –Using Fill with Constraint CurvesFill Surface built to single boundary with curves constraining cross sectionConstraintCurve 1Boundary ConstraintCurve 2Lofted SurfaceClose Loop Loft with one Guide CurveGuide CurveProfile 2Profile 3Profile 4Profile 1Exerciseexercise/exercise-knit-make-solid.SLDPRT 1)Open file andextrude a surfaceusingsketch ”Sketch-for-side-top-surf “.2)Use the endcondition “mid-planemaking sure surfacesextend beyondexisting remotesurfaces.Exercise3)Select the surface body filter tool(customize it in if you don’t have it in yourfilters toolbar) and INSERT/SURFACE/KNIT 4)Select the five surface bodies and completethe knit feature.Exercise5)Deselect the surface bodiesfilter.6)INSERT/SURFACE/TRIM andselect the Surface-knit1 as thetrim tool.7)Click on the inner part of theSurface-extrude5 and RMB OK.8)Shift select the last two featuresin the FM andINSERT/SURFACE/KNIT andcomplete the feature.Exercise9)The final step is to makeyour surface body solid.Go toINSERT/BOSS/THICKEN.10)Check the “Create Solidfrom enclose volume.11)Click OK12)Your surface body is nowa solid part.Use Multi-thickness settings to get shell to “solve”.Shelling Problems.2 inch multi-thickness Here allows shell to “solve”.25 inch multi-thickness .125 inch shellShelling Tips§ Test Surfaces as you build by using Offset Surface. § Cut away rest of model that you know is error free § Work within the shell while it is Suppress. § Beware of some Variable Fillets that will not shell. § Use multi-thickness to “help” shell to solve. § Avoid “3 Sided” or “Triangular” surfaces. § Avoid Cut-with-Surface along surface to solid edges.Replace Face/sReplacement Surface/sTarget Face/s to be replaceTrim Notice that surface does not have to bound target faceReplace FaceDelete FaceDelete FacesBase Part TechniqueBase PartSurfaces can now be includedDerived PartsSplit Part TechniqueMaster Model with Part All Solid parts “Split out” line QuiltsDerived PartsSplit Part TechniqueBeware, Split Parts who’s Master Part fails, can not be (currently) redefined!。