AlSi9Cu3(Fe) ALAŞIMININ YÜKSEK BASINÇLI DÖKÜMÜNDE TASARIM KRİTERLERİNİN POROZİTEYE ETKİSİNİN TEORİK VE DENEYSEL OLARAK ARAŞTIRILMASI

Yıl 2022, Cilt: 23 Sayı: 1, 25 - 36, 30.06.2022

Tahir Altınbalık , F. Atahan Yüksel

Öz

Bu çalışmanın amacı, yüksek basınçlı döküm (HPDC) prosesiyle elde edilen parçaların porozite nedeniyle reddedilmesini önlemektir. Kalıp tasarımı otomotiv endüstrisinde kullanılan bir motor bağlantı parçasının HPDC ile üretimi için yapılmıştır. Çalışma için dikkate alınan proses parametreleri, yolluk ve hava cebi sayısı, sviç noktası konumu ve ikinci faz hız değeridir. Hava cebi ve yolluk sayısı simülasyonlara göre belirlenmiştir. Yolluk sayısını belirlemek için 5 temel parametre dikkate alınarak simülasyonlar yapılmış ve kalıpta türbülanslı malzeme akışı olmamasına özen gösterilmiştir. Daha sonra simülasyon çalışmaları ile sviç noktasının konumu ve ikinci faz hızı belirlenmiştir. Simülasyon çalışmaları tamamlandıktan sonra kalıplar işlenmiştir. Daha sonra AlSi9Cu3(Fe) alaşımı kullanılarak basınçlı döküm işlemi gerçekleştirilmiştir. Üretilen parçalarda, bilgisayarlı tomografi (CT) ve optik mikroskop (OM) kullanılarak gözeneklilik kontrolü yapılmıştır. Porozite seviyesi standartlara göre çok düşük ve kabul edilebilir mertebede bulunmuştur.

Anahtar Kelimeler

HPDC, Sviç uzunluğu, Prozite, Hava cebi

Teşekkür

Aslar Pres Döküm A.Ş.'ye teşekkür ederiz

THEORETICAL and EXPERIMENTAL INVESTIGATION of the EFFECT of DESIGN CRITERIA on POROSITY in HPDC of AlSi9Cu3(Fe) ALLOY

Öz

The aim of present study is to prevent the rejection of parts because of the porosity during the high pressure die casting (HPDC) process. Die design was carried out for the production of the engine connection part for automotive industry with HPDC. Process parameters taken into consideration for study are number of runner and airflow, switch point location and second phase speed value. Number of aiflows and runner was determined acoording to simulations. In order to determine the number of runners, simulations were made by considering 5 basic parameters and care was taken not to turbulent material flow in the mold. Then, the location of the switch point and the second phase speed were determined by simulation studies. After the simulation studies were completed, the molds were manufactured. Then, HPDC process was carried out using AlSi9Cu3(Fe) alloy. The casted parts were analyzed by means of porosity using computed tomography (CT) and optical microscope (OM). The porosity level was found to be very low and acceptable according to the standards.

Anahtar Kelimeler

HPDC, Switch length, Porosity, Airflow

Kaynakça

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