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


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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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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

Module 4a


Principle of the process structure process modeling defects design for manufacturing dfm

Solid profiles

Shaping Processes For Plastics - Extrusion

Die configurations and extruded products

Extruded product depends on the shape of die

Handouts 4c


Principle of the process structure process modeling defects design for manufacturing dfm

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


Principle of the process structure process modeling defects design for manufacturing dfm

Die configurations and extruded products

Defects in Extrusion – melt fracture

Turbulence flow at the entrance of the die

Handouts 4c


Principle of the process structure process modeling defects design for manufacturing dfm

Friction between die and extrudate

Die configurations and extruded products

Defects in Extrusion – sharkskin or bambooing

Handouts 4c


Principle of the process structure process modeling defects design for manufacturing dfm

Design For Manufacturing – Plastics Extrusion

Shrinkage is a root cause. In the figure below, there are three common types of problems

Handouts 4c


Principle of the process structure process modeling defects design for manufacturing dfm

Design For Manufacturing – Plastics Extrusion

Handouts 4c


Principle of the process structure process modeling defects design for manufacturing dfm

Design For Manufacturing – Plastics Extrusion

Handouts 4c


Principle of the process structure process modeling defects design for manufacturing dfm

Design For Manufacturing – Plastics Extrusion

DFM guideline – wall thickness:

Handouts 4c


Principle of the process structure process modeling defects design for manufacturing dfm

Design For Manufacturing – Plastics Extrusion

DFM guideline – wall thickness:

Handouts 4c


Principle of the process structure process modeling defects design for manufacturing dfm

Design For Manufacturing – Plastics Extrusion

DFM guideline – wall thickness:

Handouts 4c


Principle of the process structure process modeling defects design for manufacturing dfm

Design For Manufacturing – Plastics Extrusion

DFM guideline – sink marks:

Handouts 4c


Principle of the process structure process modeling defects design for manufacturing dfm

Design For Manufacturing – Plastics Extrusion

DFM guideline – hole location:

Handouts 4c


Principle of the process structure process modeling defects design for manufacturing dfm

Design For Manufacturing – Plastics Extrusion

DFM guideline – hole location:

Handouts 4c


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