Basınçlı döküm prosesinde iki farklı soğutma kanallı kalıpların döküm-kalıp arayüzey ısı transfer katsayısının nümerik olarak incelenmesi

Year 2022, , 283 - 300, 15.01.2022

Mehmet Kan , Osman İpek , Murat Koru

https://doi.org/10.17714/gumusfenbil.987451

Abstract

Basınçlı dökümde, döküm-kalıp arayüzey ısı transfer katsayısı (AITK) kalıp ve dökümü yapılan parçada meydana gelen yapısal değişimler ile katılaşma hızını etkileyen önemli unsurdur. AITK, döküm-kalıp arasında meydana gelen ısı transferi, katılaşma hızı, ergiyik metal ve kalıp sıcaklıkları, döküm ve kalıp malzemesi gibi birçok faktörlerden bağlı olarak değişim gösterir. Bu çalışmada, basınçlı döküm prosesinde klasik soğutma kanallı metal kalıp ile özgün soğutma kanallı metal kalıp için döküm-kalıp AITK’nın zamana bağlı değişimi nümerik olarak incelenmiştir. Basınçlı döküm prosesinde; döküm malzemesi olarak Al6061 alüminyum alaşımı kullanılacak metal kalıplar için AITK, sıcaklık dağılımı ve ısı transferi bakımından karşılaştırılması yapılmıştır. 0.5-10 s zaman aralığında yapılan analizlerde bu kalıplar ile ergiyik metal arasındaki AITK ve sıcaklıklar hesaplanmıştır. Özgün soğutma kanallı kalıpta klasik soğutma kanallı kalıba göre 1.33 kat daha iyi sıcaklık düşüşü gerçekleşmiştir. Özgün soğutma kanallı kalıpta klasik soğutma kanallı kalıba kıyasla 2.23 kat daha iyi ısı transfer katsayısı olduğu hesaplanmıştır. Sonuç olarak; özgün soğutma kanallı kalıpta AITK, sıcaklık dağılımı ve ısı transferinin daha iyi olduğu gözlemlenmiştir.

Keywords

Arayüzey ısı transfer katsayısı, Basınçlı döküm, HAD, Kalıp

Supporting Institution

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Project Number

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Thanks

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Numerical investigation of casting-mold interfacial heat transfer coefficient of molds with two different cooling channels in pressure casting process

Abstract

In the pressure casting, the casting-mold interface heat transfer coefficient (IHTC) is a significant element affecting the solidification rate with the structural changes occurring in the mold and the part being cast. IHTC varies depending on many factors such as heat transfer between molten metal and mold, solidification rate, casting and mold temperatures, casting, and mold material. In this study, the time-dependent variety of IHTC of casting for a conventional cooling channel metal mold and an original cooling channel metal mold in the pressure casting process was numerically investigated. In the pressure casting process, IHTC for metal molds using Al6061 aluminum alloy as casting material was compared in terms of temperature distribution and heat transfer. The IHTC and temperatures between these molds and the molten metal were calculated in the analyzes made in the 0.5-10 s time interval. In the original cooling channel mold, the temperature drop was 1.33 times better than the conventional cooling channel mold. It has been calculated that the original cooling channel mold has a 2.23 times better heat transfer coefficient compared to the conventional cooling channel mold. As a result, it was observed that IHTC, temperature distribution and heat transfer were better in the original cooling channel mold.

Keywords

Interface heat transfer coefficient, High pressure casting, CFD, Mold

Project Number

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