Machining Impossible Shapes

On November 9-11, 1998,85 participants, representing 17 countries, gathered in Aubum Hills, Michigan, at the Chrysler Tech Center, to attend a workshop "SSM'98" (or Sculptured Surface Machining '98) organized by IFIP Working Group 5.3. This was the first major workshop on sculptured surface machining since the CAM-I sponsored conference "Machining Impossible Surfaces" held in 1981. The purpose of the SSM'98 workshop, entitled "Machining Impossible Shapes", was to promote a cross-fertilization of ideas among three communities: industrial users, CAM software developers and academic researchers. There were 17 participants who were "industrial users", 15 represented CAM software developers, 4 were from the machine tool industry, with the remainder being academic researchers. The format of the meeting included 40 presentations in 9 sessions, 4 keynote speeches and a sufficient amount of time for informal discussion amongst the participants. One of the most valuable aspects of the workshop was the opportunity for participants to meet informally and to discuss their mutual interests. This led to two "participant organized" sessions on five axis machining and on machine tool controllers.

Contenu

1. Industrial Users Perspectives.- Cutting Molds/Dies from Scan data.- Experiences from a Quantum Leap Improvement in Turbine Manufacturing.- A Generative Approach for Die Pattern Machining.- 2. Computational Geometry for SSM.- Geometric Contribution to 3-axis Milling of Sculptured Surfaces.- Efficiency of Multi-Axis NC Machining of Sculptured Part Surfaces.- Best-fit of Sculptured Surfaces.- Point-based Geometric Modelling.- 3. Geometric Simulation and NC Verification.- Virtual Machining and the Manufacturing Model.- Virtual CNC with Performance Error Modeling.- Fast Simulation of Sculptured Surface Milling with 3-axis NC Machine.- Simulation of Ball-nose End Milling Operations Selection of Geometric Resolution Parameters.- 4. Cutting Force Modeling for SSM.- Machining Process Modeling for Intelligent Rough Machining of Sculptured Parts.- Bridging the Gap between Tool Path generation for SSM and Computer Aided Process Modelling Techniques.- Automatic Five-Axis CNC Feedrate Selection via Discrete Mechanistic, Geometric, and Machine Model Integration.- Milling Simulation with an Adaptive Strategy.- Deformed Swept Volume Analysis to NC Machining Simulation with Cutter Deflection.- 5. Shape Reverse Engineering.- Segmentation and Surface Fitting in Reverse Engineering [Keynote paper].- Surface Reconstruction from Point Clouds.- Reverse Engineering Employing a Wrap-Around SurfaceTriangle Set.- Manufacturability of Reverse Engineered CAD-models: a case study.- Measurement Uncertainty due to Work-piece Error Interaction with Sampling Period.- 6. Virtual and Rapid Prototyping.- Design Evaluation of Virtual Clay Models using Selective Laser Sintering.- Finding Near-Optimal Build Orientations for Shape Deposition Manufacturing.- A Layered 5-axis Machining Method.- BuildingVery Large Complex Shapes using a Flexible Blade Cutter.- Machining Large Complex Shapes using a 7 DoF Device.- 7. Three Axis Tool Path Generation Methods.- Optimal Tool Selection for Interference-free Sculptured Surface Machining.- Exact Polyhedral Machining.- Optimal Tool Path Generation for 2 ½ D Milling of Dies and Molds.- Pencil Curve Tracing via Virtual Digitizing.- 8. High Speed Machining.- High Performance Machining for Die/Mold Manufacturing R&D in Progress, [Keynote paper].- 5-axis High Speed NURBS-machining on a New Parallel Kinematic-machine.- HSC-Appropriate NC Programming in Die and Mould Manufacturing.- High Speed Machining (HSC) of Sculptured Surfaces in Die and Mold Manufacturing.- 9. Five Axis Tool Path Generation Methods.- Optimized NC-toolpath Generation for 5-axis Machining of Complex Surfaces.- Adaptive Tool Path Planning for 5-Axis Sculptured Surface Machining by Machining Strip Evaluation.- Curvature Matched Machining Methods Versus Commercial CAD Methods.- Five Axis Control Sculptured Surface Machining Using Conicoid End Mill.- A Unified Approach to Accessibility in 5-axis Freeform Milling Environments.