Drawing unit and corresponding method for metal products

Abstract

Unit for drawing metal products including at least one motorized roller configured to support and move at least one oblong metal product along an axis of feed, and at least two contrast rollers configured to rotate idly about respective axes of rotation and disposed opposite said at least one motorized roller. The disclosure also concerns a method to draw oblong metal products.

1 . A drawing unit ( 10 ) for moving at least one metal product (P 1 , P 2 ) along an axis of feed (X), comprising at least two contrast rollers ( 15 ,  16 ;  17 ,  18 ) configured to rotate about respective axes of rotation (F 1 , F 2 ; F 3 , F 4 ) and disposed opposite at least one motorized roller ( 12 ,  13 ), with respect to said axis of feed (X), wherein said at least two contrast rollers ( 15 ,  16 ;  17 ,  18 ) are selectively mobile with respect to said at least one motorized roller ( 12 ,  13 ) along an axis of transverse movement (T) substantially parallel to said axes of rotation (F 1 , F 2 ; F 3 , F 4 ). 
     
     
         2 . The drawing unit ( 10 ) as in  claim 1 , wherein said at least two contrast rollers ( 15 ,  16 ;  17 ,  18 ) are substantially facing each other and substantially coaxial. 
     
     
         3 . The drawing unit ( 10 ) as in  claim 1 , wherein, said at least two contrast rollers ( 15 ,  16 ;  17 ,  18 ) are opposite the same motorized roller ( 12 ,  13 ). 
     
     
         4 . The drawing unit ( 10 ) as in  claim 1 , wherein it comprises a base ( 11 ), with which said at least one motorized roller ( 12 ,  13 ) is operatively associated, and a second support ( 22 ) with which said contrast rollers ( 15 ,  16 ;  17 ,  18 ) are operatively associated, said second support ( 22 ) being able to be selectively moved with respect to said base ( 11 ) along said axis of transverse movement (T). 
     
     
         5 . The drawing unit ( 10 ) as in  claim 4 , wherein that said at least two contrast rollers ( 15 ,  16 ;  17 ,  18 ) are associated with a first support ( 21 ) which can be selectively moved with respect to said second support ( 22 ) and in the direction of said at least one motorized roller ( 12 ,  13 ) along a first axis of movement (A) orthogonal to said axis of feed (X). 
     
     
         6 . The drawing unit ( 10 ) as in  claim 4 , wherein that said at least two contrast rollers ( 15 ,  16 ;  17 ,  18 ) can be selectively moved with respect to said first support ( 21 ) in directions parallel to said first axis of movement (A), in an independent manner with respect to each other. 
     
     
         7 . The drawing unit ( 10 ) as in  claim 5 , wherein it comprises at least two pairs ( 19 ,  20 ) of contrast rollers ( 15 ,  16 ;  17 ,  18 ) adjacent to each other in a direction substantially parallel to said axis of feed (X) and opposite, with respect to said axis of feed (X), respective motorized rollers ( 12 ,  13 ), and in that homologous contrast rollers ( 15 ,  17 ;  16 ,  18 ) of different pairs ( 19 ,  20 ) are pivoted to respective contrast supports ( 23 ,  24 ) associated with said first support ( 21 ). 
     
     
         8 . The drawing unit ( 10 ) as in  claim 4 , wherein it comprises a transducer device ( 26 ) configured to monitor the distance of said second support ( 22 ) with respect to said base ( 11 ). 
     
     
         9 . A method to draw at least one metal product comprising a drawing step in which oblong metal products (P 1 , P 2 ) are moved, along an axis of feed (X), by means of at least one motorized roller ( 12 ,  13 ) to which there are opposed, with respect to said axis of feed (X), at least two contrast rollers ( 15 ,  16 ;  17 ,  18 ) rotating about respective axes of rotation (F 1 , F 2 ; F 3 , F 4 ), wherein it comprises at least one adjustment step in which the reciprocal position between said at least two contrast rollers ( 15 ,  16 ;  17 ,  18 ) and said at least one motorized roller ( 12 ,  13 ) is adjusted along an axis of transverse movement (T) substantially parallel to said axes of rotation (F 1 , F 2 ; F 3 , F 4 ). 
     
     
         10 . The method as in  claim 9 , wherein said at least two contrast rollers ( 15 ,  16 ;  17 ,  18 ) are substantially facing each other and substantially coaxial. 
     
     
         11 . The method as in  claim 9 , wherein said at least two contrast rollers ( 15 ,  16 ;  17 ,  18 ) are opposite the same motorized roller ( 12 ,  13 ). 
     
     
         12 . The method as in  claim 9 , wherein in said drawing step at least two metal products (P 1 , P 2 ) are drawn at the same time, wherein a first contrast roller ( 15 ;  17 ) of said at least two contrast rollers ( 15 ,  16 ;  17 ,  18 ) acts only on a first metal product (P 1 ) wherein a second contrast roller ( 16 ;  18 ) of said at least two contrast rollers ( 15 ,  16 ;  17 ,  18 ) acts only on a second metal product (P 2 ) different from said first metal product (P 1 ). 
     
     
         13 . The method as in  claim 9 , wherein said adjustment step provides to move said at least two contrast rollers ( 15 ,  16 ;  17 ,  18 ) with respect to said at least one motorized roller ( 12 ,  13 ) along said axis of transverse movement (T). 
     
     
         14 . The method as in  claim 9 , wherein said adjustment step occurs as a function of the nominal diameter (ϕ 1 , ϕ 2 , ϕ 3 ) of said metal products (P 1 , P 2 ).