Analisa Proses Perpindahan Panas pada Pengecoran Paduan Al-12%Si dengan Metode Elemen Hingga

Muhammad Bahtiyar Firdaus, Mas Irfan Purbawanto Hidayat, Dian Mughni Fellicia
Submission Date: 2016-07-27 12:14:06
Accepted Date: 2017-01-26 11:12:52

Abstract


Piston merupakan salah satu komponen yang sangat penting bagi sebuah kendaraan. Di dalam sebuah industri, pembuatan piston dilakukan dengan cara pengecoran atau casting. Dalam proses pengecoran terdapat banyak fenomena umum yang tidak dapat dikontrol secara langsung seperti distribusi temperatur, tegangan termal, penyusutan serta deformasi cetakan. Oleh karena itu digunakan ANSYS Mechanical APDL yang berbasis metode elemen hingga untuk memprediksi fenomena dalam proses pengecoran. Digunakan pasir silika sebagai cetakan pasir dan SS304 sebagai permanent mold. Bahan coran yang digunakan adalah AL-12%Si. Ukuran piston Ninja 250R dijadikan referensi pada simulasi ini dimana memiliki dimensi bore dan stroke sebesar 62 mm dan 41.2 mm. Di dalam penelitian ini didapatkan pola distribusi temperatur serta tegangan termal dan juga shrinkage yang terjadi selama proses pengecoran dari kedua cetakan tersebut. Didapatkan nilai tegangan termal maksimum serta shrinkage sebesar 3.89E+09 Pa dan 31135.5 mm3 pada keseluruhan cetakan SS304 sedangkan pada keseluruhan cetakan pasir adalah 2.35E+08 Pa dan 600 mm3. Untuk bagian coran nilai tegangan termal maksimum dan shrinkage pada cetakan SS304 adalah 65228892.2 Pa dengang shrinkage sebesar 6.9457 mm3 dan pada cetakan pasir sebesar 258718.871 Pa dan 0.0245 mm3.

Keywords


Al-12%Si; Analisa elemen hingga; distribusi temperatur; pengecoran; shrinkage; tegangan termal

References


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