Constellium Neuf-brisach

Constellium Issoire

Guillaume Delgrange

Olivier Rebuffet

Estelle Muller

Christophe Chabriol

Romain-Fabrice Bernes

The invention relates to a method for producing a stamped component of motor vehicle bodywork or body structure from aluminium alloy comprising the steps of producing a metal sheet or strip of thickness between 1.0 and 3.5 mm in an alloy of composition (% by weight): Si: 0.60-0.85; Fe: 0.05-0.25; Cu: 0.05-0.30; Mn: 0.05-0.30; Mg: 0.50-1.00; Ti: 0.02-0.10; V: 0.00-0.10 with Ti+V&#x2264;0.10, other elements each &#x3c;0.05, and &#x3c;0.15 in total, remainder aluminium, with Mg&#x3c;&#x2212;2.67&#xd7;Si+2.87, dissolving and steeping, pre-tempering, maturation for between 72 hours and 6 months, stamping, tempering at a temperature of around 205&#xb0; C. with a hold time between 30 and 170 minutes or tempering at a time-temperature equivalent, painting and 'bake hardening' of the paints at a temperature of 150 to 190&#xb0; C. for 15 to 30 minutes.

Method for manufacturing a structure component for a motor vehicle body

The invention relates to a vacuum chamber element obtained by machining and surface treatment of a plate of thickness at least equal to 10 mm made of aluminium alloy composed as follows (as percentages by weight), Si: 0.4-0.7, Mg: 0.4-1.0; the Mg/Si ratio as a percentage by weight being less than 1.8; Ti: 0.01-0.15, Fe 0.08-0.25; Cu &#x3c;0.35; Mn &#x3c;0.4; Cr: &#x3c;0.25; Zn &#x3c;0.04; other elements &#x3c;0.05 each and &#x3c;0.15 in total, the rest aluminium, characterized in that the grain size of said plate is such that the mean linear intercept length, measured in plane L/TC according to standard ASTM E112, is at least equal to 350 &#x3bc;m between surface and &#xbd; thickness. The invention also relates to the method of manufacturing of such a vacuum chamber element. The products according to the invention are particularly advantageous, particularly in terms of resistance to creep deformation at high temperature, while having high properties of corrosion resistance, homogeneity of properties in thickness and machinability.

Aluminium alloy vacuum chamber elements stable at high temperature

The invention relates to a method for manufacturing a stamped motor vehicle bodywork or shell-structure component made of an aluminium alloy, comprising the steps of manufacturing a metal sheet or strip with a thickness of 0 to 3.5 mm made of an alloy with the following composition (wt %): Si: 0.60-0.85; Fe: 0.05-0.25; Cu: 0.05-0.30; Mn: 0.05-0.30; Mg: 0.50-0.00; Ti: 0.02-0.15; V: 0.00-0.15; other elements &#x3c;0.05 each and &#x3c;0.15 in total, remainder aluminium, with Mg&#x3c;&#x2212;2.67&#xd7;Si+2.87, solution heat treating and quenching, pre-tempering, ageing for 72 hours to 6 months, stamping, tempering at a temperature of around 205&#xb0; C. with a dwell time of 180 to 480 minutes or tempering at an equivalent time and temperature, painting and 'bake hardening' at a temperature of 150 to 190&#xb0; C. for 15 to 30 min. The invention also relates to a stamped motor vehicle bodywork or shell-structure component, further referred to as 'body in white' produced by such a method.

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Grenoble, France

Guillaume Delgrange