EXPERIMENTAL AND NUMERICAL INVESTIGATION OF THE FRICTIONAL FORCES IN EQUAL CHANNEL ANGULAR PRESSING

Abstract

The main limitation of the Equal Channel Angular Pressing (ECAP) is the very high required punching force for pushing the metallic sample to next channel. Frictional forces in ECAP process are responsible for very high required punching force. The participation of exit and entrance channels in total friction force has not been studied experimentally hitherto. Through the current study, two ECAP dies (1) with two channels (normal ECAP die) and (2) with only one channel (the exit channel was missed) were manufactured. Three-dimensional finite element analysis was conducted. The effect of the exit channel on the total punching force, sample geometry, and grain refinement rate were investigated experimentally and numerically. According to the results, the exit channel has a considerable effect on the amount of minimum required punching force and the grain refinement in ECAP process. The comparisons showed that, the trend of the results from experimental investigations were in good agreement with numerical analysis. 

Keywords

• Equal channel angular pressing
• Friction
• Punching force
• Finite element method

Eşit Kanal Açısal Presleme Sürtünme Kuvvetlerinin Deneysel ve Sayısal İncelenmesi

Abstract

Eşit Kanal Açısal Preslemenin (EKAP) temel sınırlaması, metal numuneyi kalıbın içine itmek için gereken yüksek zımbalama kuvvetidir. Gerekli yüksek zımbalama kuvvetinden EKAP sürecindeki sürtünme kuvvetleri sorumludur. Çıkış ve giriş kanallarının toplam sürtünme kuvvetine katılımı şimdiye kadar deneysel olarak incelenmemiştir. Bu çalışma sayesinde, iki kanallı (normal EKAP kalıbı) ve yalnızca bir kanallı (çıkış kanalı yok) olmak üzere iki EKAP kalıbı (1) (2) üretilmiştir. Üç boyutlu sonlu elemanlar analizi yapılmıştır. Çıkış kanalının toplam zımbalama kuvveti, numune geometrisi ve tane inceltme oranı üzerindeki etkisi deneysel ve sayısal olarak incelenmiştir. Sonuçlar, çıkış kanalının, EKAP sürecinde gerekli asgari zımbalama kuvveti miktarı ve tane inceltme üzerinde önemli bir etkiye sahip olduğunu göstermiştir. Yapılan karşılaştırmalar, deneysel araştırmaların sonuçlarının sayısal analiz ile uyumlu olduğunu göstermiştir.

Keywords

• Eşit kanal açısal presleme
• Sürtünme
• Zımbalama kuvveti
• Sonlu eleman yöntemi

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