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![STL Format
• //Solid_STL.h
• typedef struct Stl1
• {
• unsigned char color;
• float nm[3], v1[3], v2[3], v3[3];
• struct Stl1 *next;
• }Stl;
• extern Stl *FirstStl, *spi;](https://image.slidesharecdn.com/partingadviser-introduction-160216090029/75/PartingAdviser-introduction-12-2048.jpg)
Uploaded byLiu PeiLing
PartingAdviser introduction
The document outlines the PartingAdviser tool, which focuses on efficient mold design by transforming surface plastic part models into extended Z maps for draft analysis and part separation. It describes a novel approach for identifying parting and hole edges without the need for complex B-rep edge-face relations, thus simplifying the design process. Future work includes enhancements such as parting line generation and improved control over vertical walls.
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PartingAdviser introduction
- 1. PartingAdviser A Mold DesignTool Product Design and Development GroupProduct Design and Development Group
- 2.
- 3. Parting is CavityDesign Core insert Cavity insert Parting face Parting line
- 4. See-through walls See-through top research Lookfrom Another Angle
- 5. Firstly we transformour surface plastic part model into Extended Z Map. Then we do draft analysis to detect undercut.
- 6. Secondly we explodethe part into core and cavity face groups. Our Extended Z Map is used to classify the part face into core, cavity, both direction, and undercut face groups. There is no parting line search or selection process until the next step. We don’t use the parting line to separate the core and cavity faces. Our method does not need to traverse the B-rep edge face relation map. The solid based mold cavity design needs to use extract region function to extract core or cavity sheet. Their extract region operation needs to traverse the B-rep edge-face relation map, which in turn needs a manifold solid.
- 7. Thirdly we performthe parting edge and hole edge loop search on the exploded core and cavity faces groups. The search algorithm is a very simple borderline search. There is no need to traverse the B-rep edge-face relation map. The parting edge loops are used to form the parting faces. The hole edge loops are used to fill the holes
- 8. Then the searchedholes are automatically filled. There is no need to pick the hole boundary edges, which is a very time-consuming process. However, the filling formula can be adjusted afterwards. This will provide the same flexibility as the manual hole filling.
- 9. Finally the searchedparting line loop is used to form the parting face. This parting face is used to form the core and cavity. This parting face is not used to split the part.
- 11.
- 12. STL Format • //Solid_STL.h •typedef struct Stl1 • { • unsigned char color; • float nm[3], v1[3], v2[3], v3[3]; • struct Stl1 *next; • }Stl; • extern Stl *FirstStl, *spi;
- 13. Future Work • Phase1 – Parting line generation from mesh edges – Selection and call back using OpenGL buffer – Adjust parting line by moving mesh • Phase 2 – Control parting line over vertical walls – Boolean operation for mesh – Precision issue – Web3D for CAD