EXPERIMENTAL INVESTIGATION OF THE PERFORMANCE OF

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BSc in Mechanical Engineering
PROJECT TITLE
EXPERIMENTAL INVESTIGATION OF THE PERFORMANCE OF
COATED DIES WITH DIFFERENT GEOMETRIES AFTER HOT
AND COLD EXTRUSION OF ALUMINUM
Submitted by GEORGE GEORGIOU
Supervisor Dr.-Eng. Antonios Lontos
NICOSIA, 12/09/2014
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TABLE OF CONTENTS
1. INTRODUCTION 2. HOT EXTRUSION EXPERIMENTAL
PROCEDURE 3. COLD EXTRUSION EXPERIMENTAL
PROCEDURE 4. CONCLUSIONS
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1. INTRODUCTION
Coating Material Hardness (HV pl)
Aluspeed 3200
Supernitride (SN) 2600
DLC 2500
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Extrusion equipment - Pressing Load Measurement
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Aluminum billets (AA6061)
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2. HOT EXTRUSION EXPERIMENTAL PROCEDURE
Hot extrusion aluminum product roughness
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3. COLD EXTRUSION EXPERIMENTAL PROCEDURE
Billets for cold extrusion
Billets for hot extrusion
Cold extrusion tests
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Pressing load and mandrel movement
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Dies and products after cold extrusion
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Experimental results after cold extrusion
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4. CONCLUSIONS

• Dies with no coating demonstrate earlier and
  worst damage. The critical area that was damaged
  is the circumference of the hole.
• For the same case the uncoated die with 8o
  extrusion angle appear better performance and
  better quality roughness of the extruded
  aluminum.
• The best behavior from all the applied coating
  types was demonstrated from the aluspeed coating.
  
• The coated dies with the supernitride and DLC
  coatings, in the beginning of the experiments
  appear to have a good behavior. After a number of
  tests both coatings were slightly detached from
  the inside area oh the hole. Probably the
  geometry of the dies prevents the good coating
  adhesion with the material of the dies.

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FUTURE WORK

• New and more suitable coatings will be
  investigated on extrusion dies.
• Further simulations and research for most
  promising die geometry.
• Large scale of extrusion tests with various
  coated dies and new geometries.
• The simulating and experimental work will expand
  to other processes such as forging, drawing,
  casting, punching and polymer processing.

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Thank You for your attention