Aluminum Extrusion Troubleshooting

Shifting on multi-hole die

Problem Description

Profiles from different holes shift relative to each other, causing non-uniform geometry.

Cause–Correction Mapping
  • Container alignment
    Cause in: Equipment

      Corrections

    • Realign.

  • Cracks in armpits/ webs
    Cause in: Die

      Corrections

    • Check design and replace tool; adjust flow, pin-out.

  • Deflected housing face
    Cause in: Die

      Corrections

    • Check hardness of tool; check tool design; replace die; short term; flow; pin-out and correct.

  • Poor support tooling
    Cause in: Die

      Corrections

    • Replace or repair support tooling.

  • Uneven billet temperature
    Cause in: Equipment

      Corrections

    • Adjust/repair.

  • Uneven container temperature
    Cause in: Equipment

      Corrections

    • Adjust/repair and consider dual temperature central container.

  • Uneven flow
    Cause in: Die

      Corrections

    • Balance by milling/grinding.

      Advantage: If flow correctable good die service will result; otherwise other corrections will result in short term production; other than flow, other corrections will get order out.
  • Uneven pin-outs
    Cause in: Die

      Corrections

    • Pin-out and adjust flow.

Please note that the information provided in this article is intended to be a general guide to the causes and corrections of Shifting on multi-hole die in aluminum extrusion. However, it is important to note that the specific cause and correction of any particular defect will vary depending on the specific extrusion process, alloy, and other factors. Therefore, it is important to consult with an experienced and professional engineer to ensure that the correct diagnosis is made and the most suitable correction is chosen.