Cooling channel free surface optimisation for additively manufactured casting tools

Tongyan Zeng, Essam Abo-Serie, Manus Henry, James Jewkes

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Abstract

In the present study, an algorithm has been developed using the adjoint method to optimise the position and cross-section of an internal cooling channel for a 3D printed tool steel insert for use in the aluminium die-casting process. The algorithm enables the development of an optimised complex industrial mould with relatively low computational cost. A transient model is validated against multiple experimental trials, providing an adapted interface heat transfer coefficient. A steady state thermal model, based on the casting cycle and thermal behaviour at the mould surface, is developed to evaluate the spatial distribution of temperature and to serve as the initial solution for the subsequent optimisation stage. The adjoint model is then applied to optimise the cooling channel emphasising the minimisation of the temperature standard deviation for the mould surface. The original transient model is applied to the optimised mould configuration via calibration using experimental data obtained from a dedicated aluminium furnace. The optimised cooling channel geometry, which uses a non-uniform cross-section across the entire pipe surface region, improves the pressure drop and cooling uniformity across the mould/cast interface by 24.2% and 31.6%, respectively. The model has been used to optimise cooling channels for a range of industrial high-pressure aluminium die-casting (HPADC) inserts. This has yielded a significant improvement in the mould operational lifetime, rising to almost 130,000 shots compared to 40,000 shots for prior designs.

Original languageEnglish
Pages (from-to)1293-1315
Number of pages23
JournalInternational Journal of Advanced Manufacturing Technology
Volume127
Issue number3-4
Early online date26 May 2023
DOIs
Publication statusPublished - 1 Jul 2023

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Funder

The author would like to acknowledge CastAlum Team for their contribution and the technical support. The authors would like also to acknowledge Innovate UK project no P16874 and Engineering and Physical Sciences Research Council EPSRC Reference EP/V02695X/1 for the fund.

Keywords

  • Adjoint optimisation
  • Aluminium high-pressure die-cooling
  • Conformal cooling
  • Die cooling optimisation

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Software
  • Mechanical Engineering
  • Computer Science Applications
  • Industrial and Manufacturing Engineering

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