Aluminum Extrusion Troubleshooting

Hot Tears

Problem Description

Cracks form in the extrusion due to thermal and stress conditions.

Cause–Correction Mapping
  • Alloy
    Cause in: Equipment

      Corrections

    • Cooler billets.

  • Bearing length
    Cause in: Die

      Corrections

    • Shorten bearings.

  • Billet length
    Cause in: Equipment

      Corrections

    • Shorter billets result in lower temperature.

  • Excess billet temperature
    Cause in: Equipment

      Corrections

    • Reduce billet temperature and ensure conformity to temperature requirements.

      Disadvantage: May reduce production.
  • Excessive press speed
    Cause in: Equipment

      Corrections

    • Reduce press speed.

      Advantage: Increased real production by lowering scrap rate.
  • Improper feed
    Cause in: Die

      Corrections

    • Modify die ports to increase feed or volume.

  • Press speed
    Cause in: Equipment

      Corrections

    • Increase speed in certain alloys, possibility of eliminating with higher speeds.

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