Unsteady thermal analysis of an injection mold by the boundary-element method

Satoru Yamamoto, Takaaki Matsuoka, Yoshinori Inoue, Hideroh Takahashi

Research output: Contribution to journalArticlepeer-review


An unsteady thermal analysis program has been developed to simulate transient heat transfer of molds in computer-aided engineering for injection molding of thermoplastics. The three-dimensional unsteady thermal conduction equation is solved by using the boundary-element method (BEM). Heat flux on the cavity and the runner during the cooling stage, which is calculated from one-dimensional thermal analysis by using the finite-difference method, is taken into consideration as boundary conditions. The change in boundary conditions due to mold opening is also taken into account in the boundary-element analysis. With the method, the mold temperatures of the past molding cycles are approximated by a set of average heat flux. Mold temperatures were calculated for the mold of a box-shaped part and were compared with experimental results. The calculated mold temperatures were in good agreement with the experimental ones during injection molding. The cycle average method was successfully applied to this analysis.

Original languageEnglish
Pages (from-to)666-677
Number of pages12
JournalHeat Transfer - Japanese Research
Issue number7
Publication statusPublished - 1992
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Fluid Flow and Transfer Processes


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