Procede de fabrication d'une piece de carrosserie de vehicule automobile, piece de carrosserie

Abstract

The present invention relates to a method of fabricating a motor vehicle bodywork part comprising a metal sheet. The metal sheet is shaped after previously being coated with a surface covering suitable for acting as a mechanical bonding interface with a thermoplastic material. The invention also provides a bodywork part, in particular a fender, a door, or a tailgate.

1 . A method of fabricating a motor vehicle bodywork part comprising a metal sheet, wherein the metal sheet is shaped after prior coating with a surface covering capable of acting as a mechanical bonding interface with a thermoplastic material.  
   
   
       2 . A method according to  claim 1 , in which a reactivatable material is used as the surface covering.  
   
   
       3 . A method according to  claim 1 , in which a thermoplastic material is overmolded onto the pre-coated sheet so that the surface covering acts as a bonding interface, which thermoplastic material serves to constitute a member.  
   
   
       4 . A method according to  claim 2 , in which the surface covering is reactivated and a member made of a thermoplastic material is applied thereto with the surface covering acting as a bonding interface.  
   
   
       5 . A method according to  claim 3 , in which a substance that is compatible with the plastics material of the member is used as the surface covering.  
   
   
       6 . A method according to  claim 5 , in which the member is made of a plastics material having a substance in common with the surface covering coated on the metal sheet.  
   
   
       7 . A method according to  claim 3 , in which bonding between the member and the surface covering is enhanced by using a metal sheet having a surface covering comprising a binder, said covering being covered on its face remote from the metal sheet with a film of thermoplastics material made of the same material as the member.  
   
   
       8 . A method according to  claim 3 , in which the overmolded member comprises a material selected from a group consisting of polypropylene and polyamide.  
   
   
       9 . A method according to  claim 3 , in which an area of metal sheet coated in the surface covering is not covered by the member of thermoplastic material, and is referred to as a free area.  
   
   
       10 . A method according to  claim 9 , in which the free area acts as a bonding interface with a component other than the member.  
   
   
       11 . A method according to  claim 3 , in which the member is selected from at least one of the elements in the group consisting of a liner; fastener means; reinforcing means; a noise screen; docking means for the bodywork part; and a spacer.  
   
   
       12 . A method according to  claim 1 , in which the metal sheet is coated with the surface covering as soon as the metal sheet is fabricated.  
   
   
       13 . A method according to  claim 1 , in which the metal sheet is coated with the surface covering immediately prior to the metal sheet being shaped.  
   
   
       14 . A method according to  claim 1 , in which the surface covering coated on the metal sheet includes a material selected from a group consisting of polypropylene and polyamide.  
   
   
       15 . A method according to  claim 1 , in which the shaping of the metal sheet includes a step of folding or stamping.  
   
   
       16 . A motor vehicle bodywork part comprising a metal sheet and fabricated by shaping the metal sheet after prior coating with a surface covering capable of acting as a mechanical bonding interface with a thermoplastic material.  
   
   
       17 - 21 . (canceled)  
   
   
       22 . The motor vehicle bodywork part of  claim 16 , wherein the bodywork part is selected from a group consisting of a door, a tailgate, a hood and a roof.  
   
   
       23 . A method according to  claim 3 , in which the applied member comprises a material selected from a group consisting of polypropylene and of polyamide.