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Principle of the process Structure Process modeling Defects Design For Manufacturing (DFM)

Principle of the process Structure Process modeling Defects Design For Manufacturing (DFM) Process variation. Solid profiles. Shaping Processes For Plastics - Extrusion. Die configurations and extruded products. Extruded product depends on the shape of die. Desired shape. Correction.

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Principle of the process Structure Process modeling Defects Design For Manufacturing (DFM)

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  1. Principle of the process Structure Process modeling Defects Design For Manufacturing (DFM) Process variation Module 4a

  2. Solid profiles Shaping Processes For Plastics - Extrusion Die configurations and extruded products Extruded product depends on the shape of die Handouts 4c

  3. Desired shape Correction Die configurations and extruded products The main quality problem is related to die swell. There are several methods to overcome the die swell a. Increase die opening length b. A draw operation follows the extrusion c. For non-round shape, a correction is needed. Handouts 4c

  4. Die configurations and extruded products Defects in Extrusion – melt fracture Turbulence flow at the entrance of the die Handouts 4c

  5. Friction between die and extrudate Die configurations and extruded products Defects in Extrusion – sharkskin or bambooing Handouts 4c

  6. Design For Manufacturing – Plastics Extrusion Shrinkage is a root cause. In the figure below, there are three common types of problems Handouts 4c

  7. Design For Manufacturing – Plastics Extrusion Handouts 4c

  8. Design For Manufacturing – Plastics Extrusion Handouts 4c

  9. Design For Manufacturing – Plastics Extrusion DFM guideline – wall thickness: Handouts 4c

  10. Design For Manufacturing – Plastics Extrusion DFM guideline – wall thickness: Handouts 4c

  11. Design For Manufacturing – Plastics Extrusion DFM guideline – wall thickness: Handouts 4c

  12. Design For Manufacturing – Plastics Extrusion DFM guideline – sink marks: Handouts 4c

  13. Design For Manufacturing – Plastics Extrusion DFM guideline – hole location: Handouts 4c

  14. Design For Manufacturing – Plastics Extrusion DFM guideline – hole location: Handouts 4c

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