Apparatus for the production of stretched wire

Abstract

A stretching machine ( 21 ) for the production of discontinuously stretched wire ( 31 ) comprises a rolltype straightening mill ( 22 ), a first roll-type advancing unit ( 23 ), a first clamping device ( 24 ), which is capable of being moved on a hydraulic linear booster ( 25 ), and a second clamping device ( 28 ), to which a cutting device ( 29 ) is attached. A pushed-in rolled wire ( 31 ) to be stretched is prestraightened by the roll-type straightening mill ( 22 ) and is advanced to the second clamping device ( 28 ) by the first rolltype advancing unit ( 23 ). Subsequently, the wire ( 31 ) is held by the two clamping devices ( 24 and 28 ), the first clamping device ( 24 ) being moved opposite to the push-in direction by the amount of a degree of stretching and correspondingly cold-forming the rolled wire. By means of the apparatus, a favourable yield-point ratio is achieved, the strain properties being maintained. By means of a sensor, the final values of, for example, the steel stress are detected, stored and used for the further production of the stretched wires.

1 . Apparatus for the industrial production of discontinuously stretched wire ( 31 ), with two spaced-apart clamping devices ( 24  and  28 ), at least one ( 24 ) of which is capable of being moved by the amount of a stretching length, characterized in that at least one of the said clamping devices ( 24  or  28 ) is equipped with a sensor for determining the wire stress.  
     
     
         2 . Apparatus according to  claim 1 , characterized in that means for introducing or advancing the wire in the wire longitudinal direction are provided.  
     
     
         3 . Apparatus according to  claim 1 , characterized in that it is provided on the entry side with a roll-type straightening mill ( 22 ).  
     
     
         4 . Apparatus according to  claim 3 , characterized in that a first roll-type advancing unit ( 23 ), a first clamping device ( 24 ), a straightening section ( 32 ) and a second clamping device ( 28 ) are arranged downstream of the roll-type straightening mill ( 22 ) in the direction of advance of the wire.  
     
     
         5 . Apparatus according to  claim 4 , characterized in that a second roll-type advancing unit is arranged between the straightening section ( 32 ) and the second clamping device ( 28 ).  
     
     
         6 . Apparatus according to  claim 4 , characterized in that the first clamping device ( 24 ) is arranged on a linear hydraulic power booster ( 25 ).  
     
     
         7 . Apparatus according to  claim 5 , characterized in that the first clamping device ( 24 ) is arranged on a linear hydraulic power booster ( 25 ).  
     
     
         8 . Apparatus according to  claim 1 , characterized in that a pressure cell is arranged as a sensor on the fixed clamping device ( 28 ).  
     
     
         9 . Apparatus according to  claim 1 , characterized in that it has on the exit side a cutting unit ( 29 ) for cutting the stretched wire ( 31 ) to length.  
     
     
         10 . Apparatus according to  claim 8 , characterized in that it has on the exit side a receptacle for the intermediate storage of the cut-to-length stretched wire ( 31 ).  
     
     
         11 . Apparatus according to  claim 1 , characterized in that it comprises a control device which sets the stretching length on the basis of a measured wire stress.  
     
     
         12 . Plant with a wire-mesh welding machine and with a preceding apparatus ( 21 ) for the production of discontinuously stretched wire ( 31 ), with two spaced-apart clamping devices ( 24  and  28 ), at least one ( 24 ) of which is capable of being moved by the amount of a stretching length, characterized in that at least one of these is equipped with a sensor for determining the wire stress.  
     
     
         13 . Method for the industrial production of discontinuously stretched wire, a wire portion ( 31 ) to be machined being gripped by two clamping devices ( 24  and  28 ) and being stretched, characterized in that, by means of a sensor for measuring the wire stress and of a travel sensor, a stress/strain dependence is recorded, and in that the latter is stored, assigned to the wire portion, for further processing.  
     
     
         14 . Method for the industrial production of discontinuously stretched wire, a wire portion ( 31 ) to be machined being gripped by two clamping devices ( 24  and  28 ) and being stretched, characterized in that, by means of a sensor for measuring the wire stress and of a travel sensor, a stress/strain dependence is recorded, and in that the stretching length is automatically adapted continuously on the basis of statistic evaluations of the stress/strain dependence.  
     
     
         15 . Method for the industrial production of discontinuously stretched wire, a wire portion ( 31 ) to be machined being gripped by two clamping devices ( 24  and  28 ) and being stretched, characterized in that, by means of a sensor for measuring the wire stress and of a travel sensor, a stress/strain dependence is recorded, and in that the stretching length is related to a stress threshold value which defines the conclusion of a preflattening phase.  
     
     
         16 . Method according to  claim 15 , characterized in that the stress threshold value is determined individually for each wire portion ( 31 ).  
     
     
         17 . Method according to one of  claims 13  to  16 , characterized in that the wire ( 31 ) is introduced automatically in the wire longitudinal direction and is cut to length automatically after stretching.