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

Mehdi ESKANDARZADE; Meysam NAJAFI ERSHADI

doi:https://doi.org/10.17482/uumfd.818759

Article Details

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

Authors:

Mehdi ESKANDARZADE | Meysam NAJAFI ERSHADI

Publisher:

Bursa Uludağ University

Main Topics:

Metallurgy | Engineering and applied operations | Manufacturing

Journal:

Uludağ University Journal of The Faculty of Engineering 2021 Vol.26 Issue 1, pp.65-78

Document Type:

Article

Publication Date:

4/2021

Document Language:

English

Document ID (Org No.):

2000628457

Frequency:

Tri-annual

eISSN:

2148-4155

pISSN:

2148-4147

DOI:

https://doi.org/10.17482/uumfd.818759

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. .

 

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.

Article Details

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

Authors: Mehdi ESKANDARZADE | Meysam NAJAFI ERSHADI

Publisher: Bursa Uludağ University

Main Topics: Metallurgy | Engineering and applied operations | Manufacturing

Journal: Uludağ University Journal of The Faculty of Engineering 2021 Vol.26 Issue 1, pp.65-78

Document Type: Article

Publication Date: 4/2021

Document Language: English

Document ID (Org No.): 2000628457

Frequency: Tri-annual

eISSN: 2148-4155

pISSN: 2148-4147

DOI: https://doi.org/10.17482/uumfd.818759

Issues

Authors:

Mehdi ESKANDARZADE | Meysam NAJAFI ERSHADI

Publisher:

Bursa Uludağ University

Main Topics:

Metallurgy | Engineering and applied operations | Manufacturing

Journal:

Uludağ University Journal of The Faculty of Engineering 2021 Vol.26 Issue 1, pp.65-78

Document Type:

Article

Publication Date:

4/2021

Document Language:

English

Document ID (Org No.):

2000628457

Frequency:

Tri-annual

eISSN:

2148-4155

pISSN:

2148-4147

DOI:

https://doi.org/10.17482/uumfd.818759