Aluminum Extrusion Troubleshooting

Chatter and snap rings

Problem Description

Periodic vibration or chatter marks appear, sometimes accompanied by snap-ring type surface damage.

Cause–Correction Mapping
  • Alloy press speed and press condition
    Cause in: Equipment

      Corrections

    • Cooler billets.

  • Bearing length
    Cause in: Die

      Corrections

    • Increase or decrease speed; repair or replace as required; clean die faces.

    • Shorten or lengthen bearings.

  • Container sealing area too large
    Cause in: Equipment

      Corrections

    • Decrease sealing surface area between die ring and liner.

  • Container sealing pressure inadequate
    Cause in: Equipment

      Corrections

    • Check container sealing pressure.

  • Tooling slipping or ‘snapping;’ under pressure
    Cause in: Die

      Corrections

    • Put graphite spray between the die and backer, and backer and bolster, to allow the tooling to move easily.

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