Method for electrically conductively connecting a contact piece to an electrical conductor, and corresponding arrangement

Abstract

A method is provided for electrically conductively connecting a contact part on the basis of copper to an electrical conductor composed of a plurality of individual wires containing aluminum. A cup-shaped contact part which has a bottom and a cylindrical sleeve, which is integrally connected to the bottom and protrudes from the bottom, is pushed with tight contact of the sleeve against the conductor to such an extent until the end face of the conductor rests against the bottom of the contact part. Consequently, at least one rotating tool ( 6 ) is applied with sustained pressure, until due to increased temperature of the conductor, the conductor is softened to such an extent that it integrally connects with the contact part. The wall of the contact part is not broken through by the tool. Finally, the tool is removed from the contact part.

1 . Method for electrically conductively connecting a contact part on the basis of copper to an electrical conductor composed of a plurality of individual wires containing aluminum, said method comprising the steps of
 a cup-shaped contact part, which includes a bottom and a cylindrical sleeve integrally connected to and projecting away from the bottom with tight contact of the sleeve to the conductor, is pushed onto the conductor until the end face of the conductor rests against the bottom of the contact part;   by means of which subsequently to the contact part is at least one rotating tool placed with sustained pressure, at least in the area of the bottom of the contact part, until the material of the conductor is softened due no the increased temperature of the material of the conductor due to friction to such an extent that it integrally connects to the contact part,   wherein the wall of t contact part is not broken by the tool; and   finally the tool is removed from the contact part.   
     
     
         2 . Method according to  claim 1 , wherein the contact part and the conductor are heated by the rotating tool while maintaining the pressure exerted by the tool on the contact part to such an extent until the material of the conductor is welded by diffusion to the contact part. 
     
     
         3 . Arrangement for carrying out the method according to  claim 1 , wherein the tool has an end face which serves as a friction surface which is determined for contact with the contact part whose radial dimensions are smaller than the radial dimensions of the bottom of the contact part. 
     
     
         4 . Arrangement according to  claim 3 , wherein the tool has at its end face a protrusion protruding from the end face for contacting the contact part. 
     
     
         5 . Arrangement according to  claim 4 , wherein the protrusion is arranged symmetrically with the axis of the tool. 
     
     
         6 . Arrangement according to  claim 4 , wherein the protrusion is arranged eccentrically with the axis of tool. 
     
     
         7 . Arrangement according to  claim 4 , wherein the protrusion is constructed so as to be pin-like. 
     
     
         8 . Arrangement according to  claim 7 , wherein the protrusion is constructed to be cylindrical. 
     
     
         9 . Arrangement according to  claim 8 , wherein the protrusion has a chamfered or rounded tip. 
     
     
         10 . Arrangement according to  claim 7 , wherein the protrusion is constructed conically, with dimensions which decrease with increasing distance from the tool. 
     
     
         11 . Arrangement according to one of  claim 7 , wherein the protrusion is provided with a thread. 
     
     
         12 . Arrangement according to  claim 7 , wherein the protrusion is constructed so as to form an acute angle facing away from the tool.