SAC METAL MALZEMELERİN ŞEKİLLENDİRİLEBİLİRLİK KRİTERLERİNİN DEĞERLENDİRİLMESİ

Bu makale için 12 Aralık 2024 tarihinde bir düzeltme yayımlandı. https://dergipark.org.tr/tr/pub/politeknik/article/1606270

Öz

Sac metal malzemelerden parçalar imal edilirken olası hataların öngörülmesi ya da sacın biçimlendirilebilme sınırlarının bilinmesi, kalıpların ekonomik tasarımı ve imalatı, ürün kalitesi, imalat hızı ve maliyet açısından son derece önemlidir. Diğer taraftan, sac metallerin deformasyon kabiliyetini değerlendirmek için Şekillendirme Sınır Diyagramı (ŞSD) yaygın olarak tercih edilmektedir. Sac malzemelerin gererek şekillendirme kabiliyetini ölçmek için faydalanılan bir diğer önemli yöntemlerden biri Erichsen şişirme testidir. Bu testte kalıp ile baskı plakası arasına sıkıştırılan sac küresel uçlu bir zımba ile şekillendirilir, sac yüzeyinde çatlak oluşumu başlayana kadar zımbanın aldığı mesafe Erichsen Sabiti (ES) olarak tanımlanır. Bu çalışmada, malzeme özelliklerinden ve deney şartlarından kaynaklanan faktörlerin ŞSD’ye ve ES değerine olan etkilerine yönelik yapılmış çalışmalar derlenmiş ve değerlendirilmiştir. Genel olarak pekleşme üsteli (n) değerinin büyümesi ve sıcaklığın yükselmesiyle sac malzemelerin şekillenebilirliğinin arttığı tespit edilmiştir. Literatürde sac kalınlığının ve zımba çapının artması ve ayrıca yağlayıcı kullanılması ile ES değerinin büyüdüğü saptanmıştır.

Anahtar Kelimeler

• Sac metal şekillendirme
• Şekillendirme Sınır Diyagramı
• Erichsen Sabiti

EVALUATION OF FORMABILITY CRITERIA FOR SHEET METAL MATERIALS

Bu makale için 12 Aralık 2024 tarihinde bir düzeltme yayımlandı. https://dergipark.org.tr/tr/pub/politeknik/article/1606270

Öz

Predicting potential failures while manufacturing parts from sheet metal materials or knowing the forming limits of the sheet is extremely important in terms of economic design and manufacturing of molds, product quality, production rate and cost. On the other hand, the Forming Limit Diagram (FLD) is widely preferred to evaluate the deformation ability of sheet metals. Another important method used to measure the stretch forming ability of sheet materials is the Erichsen cupping test. In this test, the sheet metal clamped between the die and the blank holder is formed with a spherical punch, and the distance taken by the punch until crack formation begins on the sheet surface is defined as the Erichsen Index (EI). In this study, researches related to the effects of the factors arising from material properties and experimental conditions on FLD and EI values were compiled and evaluated. In general, it has been detected that the formability of sheet materials increases with the increase of the strain hardening exponent (n) and the temperature. In the literature, it was found out that the EI value got larger with the increase in sheet thickness and punch diameter, as well as with lubrication.

Anahtar Kelimeler

• Sheet metal forming
• Forming Limit Diagram
• Erichsen Index

Kaynakça

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