上海交通大学：《现代机械工程图学》教学资源（实践课件）06_UG：Free Form Feature ME 250：Design & Manufacturing I

UG:Free Form Feature ME 250:Design Manufacturing I School of Mechanical Engineering Shanghai Jiao Tong University 1

Shanghai Jiao Tong University 1 UG: Free Form Feature ME 250: Design & Manufacturing I School of Mechanical Engineering

Outline ■Introduction Create and Edit Splines ■Create Surfaces ■ Summary Shanghai Jiao Tong University 2

Shanghai Jiao Tong University 2 Outline n Introduction n Create and Edit Splines n Create Surfaces n Summary

Introduction Create the curves used to construct sheet bodies. Create the sheet bodies that will define the surfaces that make up the solid. Shanghai Jiao Tong University 3

Shanghai Jiao Tong University 3 Introduction n Create the curves used to construct sheet bodies. n Create the sheet bodies that will define the surfaces that make up the solid

Examples Shanghai Jiao Tong University 4

Shanghai Jiao Tong University 4 Examples

Examples <C Shanghai Jiao Tong University 5

Shanghai Jiao Tong University 5 Examples

Examples Shanghai Jiao Tong University 6

Shanghai Jiao Tong University 6 Examples

Objectives Create simple well-defined geometry that captures the design intent. Analyze the sheet bodies/curves for continuity and flow as well as their relationship to surrounding geometry. Edit the sheet bodies/curves in the areas that need modifications. Shanghai Jiao Tong University 7

Shanghai Jiao Tong University 7 Objectives n Create simple well-defined geometry that captures the design intent. n Analyze the sheet bodies/curves for continuity and flow as well as their relationship to surrounding geometry. n Edit the sheet bodies/curves in the areas that need modifications

Free Form Modeling Process Point based Curve based Sheet based Free Form Feature Create/Analysis/Edit Form Feature Operation Feature Sew/Thicken/Trim Body Extract Solid Sheet Note: Sew/Thicken Point based sheet is non parametric Curve_based sheet is parametric(Smart Sheet)100% Sheet_based sheet is most parametric Shanghai Jiao Tong University 8

Shanghai Jiao Tong University 8 Free Form Modeling Process Point _ based Curve _based Sheet _ based Free Form Feature Create/Analysis/Edit Form Feature & Operation Feature Sew/Thicken/Trim Body Solid Sheet Extract Note: Sew/Thicken  Point _based sheet is non parametric  Curve _based sheet is parametric (Smart Sheet) 100%  Sheet _based sheet is most parametric

Free Form Modeling Process General Process: Create Analysis Spline(Optional): Build“Primary Sheet'”: 口四例 Build“Transition Sheet”: +3.7770 Analysis Face Analysis-Face +5.6655 Edit Free Form Feature +1133 Note:Using Edit-→Features→Parameters. or Using MB3 pop menu on node within +INF PNT。 -11.331 Build Solid Body: -5,6655 -3,7770 Shanghai Jiao Tong University 9

Shanghai Jiao Tong University 9 Free Form Modeling Process General Process： Ø Create & Analysis Spline (Optional) ： Ø Build “Primary Sheet” ： Ø Build “Transition Sheet” ： Ø Analysis Face ：Analysis → Face Ø Edit Free Form Feature Note: Using Edit→ Features → Parameters… or Using MB3 pop menu on node within PNT。 Ø Build Solid Body：

Curves Most Free Form Modeling applications will require the use of a previously created edge or generating curve. It is important to control the complexity of these curves,as the complexity will be passed on to its associated body. Shanghai Jiao Tong University 10

Shanghai Jiao Tong University 10 Curves n Most Free Form Modeling applications will require the use of a previously created edge or generating curve. n It is important to control the complexity of these curves, as the complexity will be passed on to its associated body