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Principle of the process Design For Manufacturing (DFM)

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Presentation on theme: "Principle of the process Design For Manufacturing (DFM)"— Presentation transcript:

1 Principle of the process Design For Manufacturing (DFM)
Structure Process modeling Defects / control Design For Manufacturing (DFM) Process variation Module 5c

2 Shaping Processes For Plastics - Extrusion
Die configurations and extruded products Extruded product depends on the shape of die Solid profiles Module 5c

3 Die configurations and extruded products
The main quality problem is related to There are several methods to overcome the die swell a. Increase die opening length b. A operation follows the extrusion c. For non-round shape, a correction is needed. Correction Desired shape Module 5c

4 Die configurations and extruded products
Defects in Extrusion – melt fracture Turbulence flow at the entrance of the die Module 5c

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

6 Principle of the process Design For Manufacturing (DFM)
Structure Process modeling Defects / control Design For Manufacturing (DFM) Process variation Module 5c

7 Design For Manufacturing – Plastics Extrusion
is a root cause. In the figure below, there are three common types of problems Module 5c

8 Design For Manufacturing – Plastics Extrusion
Module 5c

9 Design For Manufacturing – Plastics Extrusion
Module 5c

10 Design For Manufacturing – Plastics Extrusion
DFM guideline – wall thickness: Module 5c

11 Design For Manufacturing – Plastics Extrusion
DFM guideline – wall thickness: Module 5c

12 Design For Manufacturing – Plastics Extrusion
DFM guideline – wall thickness: Module 5c

13 Design For Manufacturing – Plastics Extrusion
DFM guideline – sink marks: Module 5c

14 Design For Manufacturing – Plastics Extrusion
DFM guideline – hole location: Module 5c

15 Design For Manufacturing – Plastics Extrusion
DFM guideline – hole location: Module 5c


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