Thiết kế flash - Parametric sketching

Parametric SketchingMotivationSolid primitives not typically supported in parametric modelers  must create a 2D profile, then sweepFeature Creation ProcedureChoose sketch plane, either a:Default work planePlanar face of existing featureWork planeRough sketchSome geometric constraints appliedAdd/delete geometric constraintsParametric dimensioningFeature creationRepeat 1 - 5Construction GeometryGeometry created as part of the parametric modeling process that does not represent actual part geometry. Includes:Work planesWork axesWork pointsConstruction geometry appears in feature treeDefault Construction Geometry: InventorWork planes – mutually perpendicularYZXZXYWork AxesX (red)Y (green)Z (blue)Work PointOrigin of WCSRough SketchParametric sketching imitates actual sketching process  rough, approximateSketch Plane ViewsView normal to sketch planeIsometric ViewGeometric ConstraintsTypical constraints include: vertical, horizontal, collinear, concentric, tangent, etc.Inventor constraintsDisplay Geometric ConstraintsSoftware includes option to show constraintsAdd/Delete ConstraintsUser can manually (explicitly) add constraintsequaltangentconcentricParametric DimensionsAdd parametric dimensions to fully constrain profileEach parametric dimension has two components:Numerical valueNameFully Constrained SketchParametric Dimensions - 2Default parameter names (e.g., d0) can be changedEquations can be used to generate parameter valueUnder and Over-constrained SketchesUnder-constrainedOver-constrainedVertical position of hole not specifiedAngle not necessaryParametric Sketching