The friction in rod forward and backward micro extrusion

• Autorzy: Piwnik J. , Mogielnicki K. , Gabrylewski M. , Baranowski P.
• Języki publikacji: EN

Abstrakty

EN

Micro parts are increasingly applied in industry because of the trend to miniaturization every day devices. Microforming is a method of manufacturing metal micro elements using a plastic treatment. This kind of production ensures high productivity, shapes and dimensions repeatability and good surface quality. Size effect connected with small dimensions affects changes in treatment processes of micro parts. While forming in micro scale, surface roughness is size independent and does not decrease with decreasing detail dimensions. The article presents schemas for forward and backward extrusion of metal rods. Using FEM, tool’s roughness as a triangle wave has been assumed, taking into account thereby size effect. Influence of roughness on extrusion forces by comparison with traditional flat tools and constant friction shear factor m has been specified. Impact of roughness caused growth of extrusion forces while forward extruding. On the contrary, backward extrusion ensured stable required forces, regardless of a surface structure.

Słowa kluczowe

EN

mechanical property; microforming; microextrusion; friction shear factor; 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: 447--450
• Opis fizyczny: Bibliogr. 6 poz., rys., wykr.

Twórcy

autor

Piwnik J.

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

autor

Mogielnicki K.

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

autor

Gabrylewski M.

• Centralny Ośrodek Badawczo-Rozwojowy Aparatury Badawczej i Dydaktycznej COBRABiD, Łucka street 15, 00-842 Warsaw, Poland

autor

Baranowski P.

• Centralny Ośrodek Badawczo-Rozwojowy Aparatury Badawczej i Dydaktycznej COBRABiD, Łucka street 15, 00-842 Warsaw, Poland

Bibliografia

• [1] J. Piwnik, The mechanics of metal extrusion processes, Wydawnictwa Politechniki Białostockiej, 1991 (in Polish).
• [2] J. Piwnik, The mechanics of plastic flow in the metal extrusion problems, Wydawnictwa WSE, Białystok, 2010.
• [3] J. Cao, Fundamentals of microforming processes, Department of Mechanical Engineering Northwestern University, 2006.
• [4] U. Engel, R. Eckstein, Microforming–from basic research to its realization, Journal of Materials Processing Technology 2002.
• [5] 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, 151 2004.
• [6] J. Jeon, A. Bramley, A friction model for microforming, The International Journal of Advanced Manufacturing Technology, Vol. 33, 2007.