Aluminum Extrusion Troubleshooting

Shifting Walls

Problem Description

Walls shift position relative to intended geometry, often progressively during production.

Cause–Correction Mapping
  • Insufficient billet temperature
    Cause in: Equipment

      Corrections

    • Increase billet temperature.

  • Poorly designed die
    Cause in: Die

      Corrections

    • Redesign die to balance flow, reduce extrusion pressure or strengthen die.

  • Soft die/housing/mandrel
    Cause in: Die

      Corrections

    • Replace or have die maker reheat treat.

      Advantage: Proper balance of walls, increase in production, and reduction in die breakage.

Please note that the information provided in this article is intended to be a general guide to the causes and corrections of Shifting Walls 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.