Deformations in micro extrusion of metals

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

Abstrakty

EN

Production technologies of small dimensions metallic elements are known for a long time. They are produced by machining methods: turning, milling, polishing. Recently, methods for manufacturing small details by forming are developed – microforming. This process is characterized by the high dimensions accuracy and the surface smoothness of received items and the high production rate. When a forming process is scaled down to micro dimensions, the microstructure of the workpiece, the surface topology of the workpiece and that of the tooling remain unchanged. Size effect is appearing. This paper analyses specifications of a metal extrusion in micro scale. To determine the impact of the tool surface roughness on deformation process the numerical model of roughness as triangle wave were developed. In paper the influence of the wave presence on the material flow is described. Impact of the forming conditions on extrusion forces there is also characterized.

Słowa kluczowe

EN

mechanical properties; micro-extrusion; rough friction; FEM simulation

PL

właściwości mechaniczne; wytłaczanie; tarcie; MES

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2010
• Tom: Vol. 10, iss. 3 spec.
• Strony: 87--90
• Opis fizyczny: Bibliogr. 8 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] J. Piwnik, The mechanics of plastic flow in the metal extrusion problems, Wydawnictwa WSE, Bialystok, 2010.
• [2] U. Engel, R. Eckstein, Microforming – from basic research to its realization, Journal of Materials Processing Technology, 2002.
• [3] J. Cao, N. Krishnan, Z. Wang, H. Lu, W.K. Liu, A. Swanson, Microforming -Experimental investigation of the extrusion process for micropins and its numerical simulation using RKEM, ASME Journal of Manufacturing Science and Engineering, Vol. 126, 2004.
• [4] J. Piwnik, K. Mogielnicki, K. Garbala, Problems related to micro–extrusion process, Aparatura Badawcza i Dydaktyczna, 2010 (in Polish).
• [5] F. Vollertsen, H. Schulze Niehoff, Z. Hu, State of the art in micro forming, International Journal of Machine Tools & Manufacture, Vol. 46, 2006.
• [6] M. Geiger, A. Messner, U. Engel , Production of microparts – size effects in bulk metal forming, similarity theory, Production Engineering, Vol. IV/1 1997.
• [7] F. Vollertsen, Z. Hu, H. Schulze Niehoff, C. Theiler, State of the art in micro forming and investigations into micro deep drawing, Journal of Materials Processing Technology, Vol. 151, 2004.
• [8] H.J. Jeon, A.N. Bramley, A Friction Model for Microforming, The International Journal of Advanced Manufacturing Technology, Vol. 33, 2007.