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Volume 23 (2024)
Volume 23, Issue 2
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International Journal of Materials Engineering and Technology
International Journal of Materials Engineering and Technology
Volume 1, Issue 2, Pages 145 - 160 (April 2009)
EFFECTS OF PUNCH COOLING ON FORMABILITY OF AZ31 MAGNESIUM ALLOY SHEETS DURING HOT FORMING
S. H. Zhang (P. R. China), L. M. Ren (P. R. China), G. Palumbo (Italy), D. Sorgente (Italy) and L. Tricarico (Italy)
Abstract:
Magnesium alloys are the lightest structural materials and have many predominant advantages. However, their industrial applications are heavily limited because of their very poor formability at room temperature. The present research was aimed to gain more insights into the formability of magnesium alloy AZ31 (aluminum 3wt.%, zinc 1wt.%) and to have first-hand knowledge of the correlations between materials properties and the process conditions. A tool system combining inverse drawing approach with local heating and cooling system was applied to investigate the formability of rectangular AZ31 cups during warm deep drawing. Conventional warm deep drawing process was also carried out to determine the proper process parameters and to investigate how much the formability of a magnesium alloy sheet can be enhanced by the new technique. A new optical measurement system was employed to measure the thickness distribution of the workpiece. The investigation indicated that the blank flange temperature in the range of 200-230°C was suitable for using the local punch cooling and heating technique. When setting the blank flange temperature as 230°C, rectangular cups were successfully obtained by the new technique at the maximum forming speed of 120mm/min. The effects of the process parameters on the formability of rectangular cup drawing were analyzed. A warm deep drawing process window was constructed as the forming speed and the forming temperature were taken into account.
Keywords and phrases:
magnesium alloy, warm deep drawing, local heating and cooling, formability, fracture, rectangular cup.
Communicated by M. Misbahul Amin
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P-ISSN: 0975-0444
E-ISSN: 2584-0339
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