Chain conveyor remelt ingot casting improvement

J. Grandfield, V. Nguyen, P. Rohan, M. Couper, K. Oswald

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

4 Citations (Scopus)

Abstract

Millions of tonnes of aluminum are produced on open mould chain conveyor ingot casting machines every year. Operators and thus manufacturers of these machines are interested in reducing the oxide levels in the ingots and reducing production costs by improving productivity. In addition to optimization of the current process through increased understanding, CAST has developed two patented technologies for ingot casting; a low dross filling system (CASTfill) and a mould design (CASTmould) with reduced ingot solidification time allowing 20% productivity increase. This paper describes the methodology used and application of various mathematical models including Smooth Particle Hydrodynamics (SPH). Protype filling system designs were tested on a full scale pilot system. The ingot/mould interface heat transfer was studied and measurements made of air gap formation and mould deformation on a purpose built rig which duplicates machine conditions. Relatively simple 2D inverse and 3D thermal models were used to gain insight by conducting simple sensitivity studies. The air gap formation controls the heat flow and the solidification time. Investigations were made into the use of helium. Alsim, a fully coupled 3D thermal stress model capable of predicting ingot and mould deformation and air gap formation was also applied to the problem. New mould designs were proposed and tested on the rig. Following successful plant testing both CASTfill and CASTmould have been adopted at a number of smelters.

Original languageEnglish
Title of host publicationLight Metals 2008 - Proceedings of the technical sessions presented by the TMS Aluminum Committee at the TMS 2008 Annual Meeting and Exhibition
Pages671-677
Number of pages7
Publication statusPublished - 30 Jun 2008
Externally publishedYes
EventTechnical Session on Light Metals held at the TMS Annual Meeting 2008 - New Orleans, United States of America
Duration: 9 Mar 200812 Mar 2008

Conference

ConferenceTechnical Session on Light Metals held at the TMS Annual Meeting 2008
Abbreviated titleLight Metals 2008
CountryUnited States of America
CityNew Orleans
Period9/03/0812/03/08

Keywords

  • Air gap
  • Filling
  • Ingot casting
  • Modeling
  • Oxide
  • Solidification

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