Numerical analysis of friction influence on the transverse welding phenomenon in the forward extrusion process

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

Abstrakty

EN

There is often a need to join billets being extruded in the forward extrusion processes in order to preserve the continuity of manufacturing of products. The primary problem connected with joining while extruding is to ensure the required state of stress, deformation and temperature assuring a good weld quality. The paper contains numerical analyses of the transverse joining processes of billets in the course of forward extruding. The impact of the friction between welded objects on the material flow in vicinity of the joints is analyzed. A numerical method for determination of the weld length at the longitudinal section, by assuming the homogeneity of the strain rate at both sides of the joined elements contact line, is proposed. Three cases of the forward extruding are analyzed. Two friction shear factors equal to m = 0.4 and m = 0.9 at the billets interface are modelled for each case and weld the lengths at the longitudinal sections are presented. In addition, distributions of the flowing material velocities and effective strains in the weld vicinity are added for all tested processes.

Słowa kluczowe

EN

extrusion; welding criteria; FE analysis

• Wydawca: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
• Czasopismo: Journal of Theoretical and Applied Mechanics
• Rocznik: 2014
• Tom: Vol. 52 nr 2
• Strony: 547--555
• Opis fizyczny: Bibliogr. 8 poz., rys.

Twórcy

autor

Piwnik J.

• Bialystok University of Technology, Faculty of Mechanical Engineering, Białystok, Poland

autor

Mogielnicki K.

• Bialystok University of Technology, Faculty of Mechanical Engineering, Białystok, Poland

autor

Kuprianowicz J.

• Bialystok University of Technology, Faculty of Mechanical Engineering, Białystok, Poland

Bibliografia

• 1. Akeret A., 1972, Properties of pressure welds in extruded aluminium alloy sections, Journal of the Institute of Metals, 100, 202-207
• 2. Bariani P.F., Bruschi S., Ghiotti A., 2006, Physical simulation of longitudinal welding in port-hole die extrusion, Cirp Annals – Manufacturing Technology, 55, 287-290
• 3. Ceretti E., Mazzoni L., Giardini C., 2009, Simulation of metal flow and welding prediction in porthole die extrusion: the influence of the geometrical parameters, International Journal of Material Forming, 2, 101-104
• 4. Donati L., Tomesani L., 2004, The prediction of seam welds quality in aluminum extrusion, Journal of Materials Processing Technology, 153/154, 366-373
• 5. Li Q., Harris C., Jolly M.R., 2003, Finite element modelling simulation of transverse welding phenomenon in aluminium extrusion process, Materials and Design, 24, 493-496
• 6. Piwnik J., 2010, Theory and Experiment in the Analysis of Extrusion Process, Bialystok University of Technology, Bialystok, 116-134
• 7. Piwnik J., Kuprianowicz J., Mogielnicki K., 2011, Numerical modeling of the welding phenomenon in forward aluminium extrusion process, Archives of Foundry Engineering, 11, 191-194
• 8. Plata M., Piwnik J., 2000, Theoretical and experimental analysis of seam weld formation in hot extrusion of aluminium alloys, Proceedings of 7th International Conferenc on ‘Aluminium extrusion technology’, Chicago, IL, USA, vol. I, 205-211