Pressure welding machine and pressure welding method

Abstract

The invention relates to a pressure welding method and a pressure welding machine ( 1 ) which is provided with a frame ( 10 ), two welding heads ( 13, 14 ), mobile along a feed axis ( 41 ), and two adjusting units ( 17, 18 ) comprising feed drives ( 23 ) for the welding heads ( 13, 14 ). The two adjusting units ( 17, 18 ) are mounted so as to be axially movable ( 41 ) on the frame ( 10 ) and are interlinked with an adjusting drive ( 25 ) by means of a common adjusting element ( 26 ) and supported in a closed system of forces while receiving the pressure welding forces, thereby relieving the frame ( 10 ). The adjusting element ( 26 ) is configured as a continuous spindle ( 27 ) having two self-locking threads ( 28, 29 ) that run in opposite directions.

1 . A pressure welding machine comprising: 
 a frame;    two welding heads, which are movable along a feed axis; two adjusting units with feed drives for said welding heads, said two adjusting units are being mounted axially movably at said frame;    a common adjusting element and    an adjusting drive, said adjusting units being connected among one another to said adjusting drive +by means of said common adjusting element and being supported.    
     
     
         2 . A pressure welding machine in accordance with  claim 1 , wherein said adjusting element is designed as a continuous spindles with two threads, which are directed in opposite directions and are connected to nuts at said adjusting units.  
     
     
         3 . A pressure welding machine in accordance with  claim 1 , wherein said threads are designed as motion threads, comprising ball or trapezoid threads.  
     
     
         4 . A pressure welding machine in accordance with  claim 1 , wherein said spindle is arranged under said welding heads and said adjusting units in machine bed of said frame.  
     
     
         5 . A pressure welding machine in accordance with  claim 1 , wherein said adjusting drive a has a controllable motor comprising an electric motor, for driving said spindle.  
     
     
         6 . A pressure welding machine in accordance with  claim 1 , wherein said frame has a carriage guide for the positive-locking mounting and guiding of travel carriages of the welding heads and said adjusting units.  
     
     
         7 . A pressure welding machine in accordance with  claim 6 , further comprising a mobile central clamping device for a central workpiece, which is mounted movably at said carriage guide and guided between said welding heads.  
     
     
         8 . A pressure welding machine in accordance with  claim 7 , wherein said central clamping device has two spaced workpiece holders, which have holder carriages mounted movably at said carriage guide.  
     
     
         9 . A pressure welding machine in accordance with  claim 1 , wherein said workpiece holders are connected to their said respective associated adjusting unit by a carriage adjuster.  
     
     
         10 . A pressure welding machine in accordance with one of the  claim 9 , wherein said carriage adjusters have a carrier and a spring for relative evading motions at the connection point with said workpiece holder.  
     
     
         11 . A pressure welding machine, especially in accordance with  claim 1 , further comprising a measuring means for measuring the true feeds and the pure workpiece shortening without elastic deformation.  
     
     
         12 . A pressure welding machine in accordance with  claim 11 , wherein said measuring means has at least one measuring unit arranged between a workpiece holder and said associated welding head.  
     
     
         13 . A pressure welding machine in accordance with  claim 12 , wherein said measuring unit has a scale and a measuring head, which are arranged movably in relation to one another at said workpiece holder and at said associated welding head.  
     
     
         14 . A pressure welding machine in accordance with  claim 11 , wherein said measuring means has a central measuring unit between said workpiece holders and/or said welding heads.  
     
     
         15 . A pressure welding machine in accordance with  claim 1 , further comprises a friction welding machine or as a machine for welding with moving arc.  
     
     
         16 . A method for pressure welding a plurality of said workpieces along a, preferably common feed axis, the method comprising: 
 providing a pressure welding machine with a frame, two said welding heads movable along a feed axis, and two said adjusting units with feed drives for said welding heads;    moving said outer workpieces are moved relative to one another by said two adjusting units mounted axially movably at said frame;    mutually supporting said adjusting units in an adjustable manner while absorbing the pressure welding forces in a closed system of forces.    
     
     
         17 . A method in accordance with  claim 16 , wherein said adjusting units and a central clamping device are positioned simultaneously and synchronously for a central workpiece.  
     
     
         18 . A method in accordance with  claim 17 , wherein the true feeds and the workpiece shortenings are measured during pressure welding without the elastic deformations of said central workpiece that occur during upsetting.