extrusion

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report ni benjie doroteo sa mantech

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extrusion

  1. 1. Presented to the class of Norberto de JesusDiscussant: Benjie F. Doroteo Jr. Powerpoint Templates Page 1
  2. 2. EXTRUSION PROCESS* it is a process used to create objects of afixed cross-section profile. A material ispushed or drawn through a die of thedesired cross-section.* it is used for manufacturing long andstraight metal parts. The shape of thecross-sections can be solid round,rectangular, to T shapes, L shapes andTubes etc. Extrusion is done by squeezingthe metal in a die by using a mechanical orhydraulic press.Powerpoint Templates Page 2
  3. 3. • Its ability to create very complex cross- sections.• Work materials that are brittle. It is because the material only encounters compressive and shear stresses. It also forms finished parts with an excellent surface finish. Powerpoint Templates Page 3
  4. 4. DISADVANTAGES ofExtrusion Process Powerpoint Templates Page 4
  5. 5. 1. Surface cracking- It occurs when the surface of an extrusion splits. This is generally caused by the high values of extrusion temperature, speed or friction. The cracking may also occur at lower temperatures, in case the extruded product temporarily sticks to the die. Powerpoint Templates Page 5
  6. 6. 2. Pipe- A flow pattern that draws the surface oxides and impurities to the center of the product. Such a pattern is normally caused by high friction or cooling of the outer regions of billet. Powerpoint Templates Page 6
  7. 7. 3. Internal cracking- It occurs when the center of extrusion develops cracks or voids. These cracks are directly attributed to a state of hydrostatic tensile stress at the centerline in the deformation zone in the die. Powerpoint Templates Page 7
  8. 8. COMMON EXTRUDED MATERIALS• Metals• Polymers• Ceramics• Concrete• Foodstuffs Powerpoint Templates Page 8
  9. 9. • Application of Extrusion Process: Trim parts as used in automobile and construction equipment, railings, window frame members, structural parts etc. Powerpoint Templates Page 9
  10. 10. SEJOURNET PROCESS (Ugine-Sejournet)• The Ugine-Sejournet or Sejournet, process is now used for other materials that have melting temperatures higher than steel or that require a narrow range of temperatures to extrude.• In 1950, Ugine Séjournet, of France, invented a process which uses glass as a lubricant for extruding steel. Powerpoint Templates Page 10
  11. 11. Powerpoint TemplatesUgine-Sejournet Process Page 11
  12. 12. Ugine Sejournet Type Extrusion Processes. The Ugine Sejournet extrusion process is used for high-alloy steel tubes and pipe such as those of stainless steel and specially shaped pipe. A descaled billet, heated to approximately 2300_F (1260_C), is placed in the vertical press compartment with an extrusion die at its bottom. After applying a hydraulic ram to the billet, a piercing mandrel within the ram punches the billet, producing a cylinder from which the punch piece is ejected through the extrusion die opening. Powerpoint Templates Page 12
  13. 13. Following this, the ram is activated to applypressure to the billet, and the billet is extrudedthrough the annulus formed between thepiercing mandrel and die cavity. In horizontalpresses, piercing is done as a separateoperation, or a hollow is used with amandreland die. Themandrels and dies are made ofhigh-alloy steels containing tungsten,molybdenum, and chromium having RockwellC hardness values of approximately 46.Powdered glass is the lubricant used in thisprocess. Powerpoint Templates Page 13
  14. 14. Advantages of Sejournet Process• Stronger products• Better dimension precision• Surface finish• Savings in material wasteDisadvantage of Sejournet Process• The extruded material should have a center barrier for metal support.• Powerpoint Templates Page 14
  15. 15. THANK YOU AND GOD BLESS US! Powerpoint Templates Page 15

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