Aluminum Extrusion Troubleshooting

Round profile is egg shaped

Problem Description

A round extrusion becomes oval or egg-shaped rather than maintaining a uniform circular cross-section.

Cause–Correction Mapping
  • Improper flow to weld area under webs
    Cause in: Die

      Corrections

    • Make welding chamber deeper to increase flow, streamline webs.

  • Inadequate flow due to bearing length
    Cause in: Die

      Corrections

    • Bearing length should be double wall thickness and taper to shorter lengths away from center of billet; also shorten bearings under webs.

  • Light walls
    Cause in: Die

      Corrections

    • Check pin openings and adjust to correct wall thickness

  • Poor support tooling
    Cause in: Equipment

      Corrections

    • Use better fitting bolster.

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