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Extrusion and Drawing

Extrusion and Drawing. Manufacturing Processes. Outline. Extrusion Extrusion of Metals Extrusion Defects Extrusion Equipment Extrusion of Nonmetals Drawing Drawing Process Drawing Equipment. Extrusion.

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Extrusion and Drawing

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  1. Extrusion and Drawing Manufacturing Processes

  2. Outline • Extrusion • Extrusion of Metals • Extrusion Defects • Extrusion Equipment • Extrusion of Nonmetals • Drawing • Drawing Process • Drawing Equipment

  3. Extrusion A compression process in which the material is forced to flow through an opening to produce a shape with a specific cross-section input die product pump

  4. Examples of Extruded Parts

  5. Extrusion Metals Nonmetals

  6. Metal Extrusion Direct Extrusion A ram compresses the material, forcing it through the die Indirect Extrusion The die is mounted on the ram; the material is forced out in the opposite direction of the ram movement

  7. Direct Extrusion

  8. Indirect Extrusion

  9. Extrusion

  10. Extrusion

  11. Metal Flow

  12. Example of an Extrusion Machine

  13. Extrusion

  14. Extrusion Hot Extrusion Involves pre-heating the material above the recrystallization temperature to increase ductility Cold Extrusion Does not pre-heat material; used to produce parts in finished or near-finished form

  15. Extrusion Cold extrusion advantages: • Improved mechanical properties from work-hardening • Good control of dimensional tolerances • Improved surface finish (no oxide film) • No heating required • Competitive production rates and costs

  16. Extruded Metals Typical extruded metals (hot or cold) Aluminum, copper, magnesium, zinc, tin and alloys of these Steel alloys are usually extruded hot; softer steels may be extruded cold Others such as titanium and refractory metals may be extruded, but with difficulty

  17. Extruded Metals Extrusion Temperature Ranges Lead 200-250 °C Aluminum and its alloys 375-475 °C Copper and its alloys 650-975 °C Steels 875-1300 °C Refractory alloys 975-2200 °C

  18. Extrusion Defects

  19. Extrusion Dies

  20. Extrusion Dies

  21. Example of an Extrusion Die

  22. Extrusion of Nonmetals Materials rubber plastic solvents candy glass Products window seals door seals hose and tubing wire insulation candy canes

  23. Hot Feed and Cold Feed Extrusion Ribbon Pellets Cold Feed Extrusion Heating/melting Hot Feed Extrusion Temperature zones

  24. Extrusion of Nonmetals Candy Canes cone rollers candy

  25. Extrusion of Nonmetals Window Seals Cold Feed Extrusion input windup die extruder takeaway belt die

  26. Extrusion of Nonmetals Plastic Bags extruder die air cutting and sealing

  27. Example of a Dual Extruded Product

  28. Dual Extrusion Opposed Head extruder extruder die Piggy Back die extruder extruder

  29. Dual Extrusion – White Side Wall Black rubber die White rubber die Exit die

  30. Wire, Tube, Bar, Rod Drawing Extrusion pushes the material through the die; drawing pulls the material through the die

  31. Drawing Products electrical wire cable wire stock for fences, hangers, shopping carts etc. rod stock for nails, screws, rivets, springs etc. metal bars

  32. Drawing Process Advantages: • Close dimensional control • Good surface finish • Improved strength and hardness • Adaptability to mass production

  33. Drawing of a Wire

  34. Drawing

  35. Drawing Preparation of the work material: • Annealing • Cleaning • Pointing

  36. Single and Multi Stage Drawing

  37. Gold Gold is the most ductile metal that exists. 4 pounds of gold can be drawn into a wire that stretches across the country.

  38. Tube and Bar Drawing

  39. Draw Bench Production Process

  40. Summary Extrusion and drawing provide ways to form shapes with uniform cross sections at high production rates

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