The friction influence on stress in micro extrusion

• Autorzy: Piwnik J. , Mogielnicki K.
• Języki publikacji: EN

Abstrakty

EN

Manufacturing of metallic parts by forming methods is industrially widespread due to high production rate, high accuracy, dimension’s and shape’s repeatability and good surface quality. The application of metal extrusion methods for the production of micro parts is possible, but there are some technological problems caused by small dimensions. Size effect is appearing. One of size effect symptom in micro extrusion, is a significant influence of rough contact between workpiece and tool while processing. In the case of rough contact without friction, material flows in the vicinity of the die surface. In order to explain more accurately a friction distribution in this area, the plastic wave friction model is proposed. This paper analyses specifications of a metal extrusion in micro scale. Using the friction model, a substitute friction shear factor m_z and its influence on extrusion loading curves is determined in relationship to size of asperities.

Słowa kluczowe

EN

mechanical property; microextrusion; rough friction; FEM simulation

PL

właściwości mechaniczne; mikroformowanie; symulacja MES

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2010
• Tom: Vol. 10, iss. 1 spec.
• Strony: 451--454
• Opis fizyczny: Bibliogr. 5 poz., rys., wykr.

Twórcy

autor

Piwnik J.

• The Department of Production Engineering, Bialystok Technical University, Wiejska street 45 C 15-351 Bialystok, Poland

autor

Mogielnicki K.

• The Department of Production Engineering, Bialystok Technical University, Wiejska street 45 C 15-351 Bialystok, Poland

Bibliografia

• [1] U. Engel, R. Eckstein, Microforming – from basic research to its realization, Journal of Materials Processing Technology 2002.
• [2] J. Piwnik, K. Mogielnicki, K. Garbala, Problems related to micro– extrusion process, Aparatura Badawcza i Dydaktyczna, 2010 (in Polish).
• [3] N. Krishnan, J. Cao, K. Dohda, Microforming: Study of friction conditions and the impact of low friction/high strength die coatings on the extrusion of micropins, ASME Journal of Manufacturing Science and Engineering, 129, 2007.
• [4] E. Vidal-Sallé, S. Boutabba, Y. Cui, J.C. Boyer, An improved plastic wave friction model for rough contact in axisymmetric modeling of bulk forming processes, International Journal of Material Forming, 2008.
• [5] J.M. Challen, and P.L.B. Oxley, An explanation of the different regimes of friction and wear using asperity deformation models, Wear 53 , 1979.