Aluminum Extrusion Troubleshooting

Starving walls

Problem Description

Certain wall sections receive insufficient metal flow, leading to incomplete fill or weak areas.

Cause–Correction Mapping
  • Billet too cold
    Cause in: Equipment

      Corrections

    • Increase billet temperature and achieve desired diametrical and linear temperature uniformity.

  • Excess press speed
    Cause in: Equipment

      Corrections

    • Reduce press speed

  • Improper feed
    Cause in: Die

      Corrections

    • Increase volume by machining die.

      Advantage: Increase in production, lower scrap rate and better quality produce.

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