Apparatus for joining metal sheets by punch riveting or penetration staking (clinching)

Abstract

Apparatus for joining metal sheets by punch riveting or penetration staking (clinching) with the die ( 10; 20 ), wherein the die ( 10; 20 ) at least partly has been coated with a carbon layer, preferably a “diamond-like carbon”-(DLC)-coating or a carbon layer applied by plasma-coating or sputtering.

1 . Apparatus for joining metal sheets by punch riveting or penetration staking (clinching) having a die ( 10 ;  20 ), characterized in that the die ( 10 ;  20 ) at least partly is coated with a carbon layer.  
     
     
         2 . Apparatus according to claims  1 , characterized in that the die ( 10 ;  20 ) in the area facing the point of joining is coated with a carbon layer.  
     
     
         3 . Apparatus according to  claim 1  or  2 , for penetration staking (clinching) with an additional punch ( 30 ), characterized in that the punch ( 30 ), too, at least partly is coated with a carbon layer.  
     
     
         4 . Apparatus according to  claim 3 , in which the die ( 20 ) is having an anvil ( 22 ) with jaws ( 21 ) movable laterally thereon, characterized in that as well the anvil ( 22 ) as the jaws ( 21 ) at least partly are coated with a carbon layer.  
     
     
         5 . Apparatus according to any of the  claims 1  to  4 , characterized in that the carbon coating is a “diamond-like carbon”-(DLC)-coating.  
     
     
         6 . Apparatus according to any of the  claims 1  to  4 , characterized in that the carbon layer is applied by plasma-coating or sputtering.