Method For Producing Different Wall Thicknesses Of A Container Tube

Abstract

Method for producing a container tube ( 15 ), in particular a supporting means for a motor vehicle strut, with longitudinal sections of tube (I-IV) of different wall thicknesses and/or inner and/or outer diameters, following one after the other in the longitudinal direction, starting from a hollow and/or tubular blank ( 1 ), by means of repeated drawing and wall ironing by means of at least one drawing and wall ironing female die ( 6, 13, 16 ), applied to the outside of the blank, towards a male die ( 9, 19, 22 ), for example a punch or mandrel, in contact with the inside of the blank, wherein, for at least some of the longitudinal sections (I-IV), a change of the male die is carried out before they are drawn and wall ironed.

1 . A method for producing a container tube ( 15 ) with consecutive longitudinal sections of tube (kV) in the longitudinal direction of different wall thicknesses or inner and/or outer diameters, for use as a container, bracing or a support for a motor vehicle strut, starting from a hollow or tubular blank ( 1 ), which by means of repeated drawing and wall ironing by means of at least one drawing and wall ironing female die ( 6 ,  13 ,  16 ) applied to the outside of the blank towards a male die ( 9 ,  19 ,  22 ) in contact with the inside of the blank, said tube is stretched for at least a part of the longitudinal sections (I-IV) and its wall thickness or its inner or outer diameter is reduced by a specified dimension each time the tube is stretched, wherein for at least some of the longitudinal sections (kV) to be reduced, a change of the male die is carried out before the tube is drawn and wall ironed. 
     
     
         2 . The method according to  claim 1 , in which in a first drawing and wall ironing operation a first longitudinal section with reduced wall thickness is formed. 
     
     
         3 . The method according to  claim 2 , wherein the respective wall thickness of the tube is sized by using the one or multiple outside dimensions ( 11 ,  12 ) of one or multiple male dies ( 9 ,  19 ,  22 ) and respectively assigned or opposite interior dimensions ( 14 ) of one or multiple drawing and wall ironing female dies ( 6 ,  13 ,  16 ). 
     
     
         4 . The method according to  claim 3 , wherein one or multiple strip off means ( 18 ) are provided on a frontal aperture ( 4 ) of the container tube ( 15 ) aiding the insertion of the male die ( 9 ,  19 ,  22 ) or a change of the male dies. 
     
     
         5 . The method according to  claim 4 , wherein the number of male die changes depends on the number of desired changes in wall thickness. 
     
     
         6 . The method according to  claim 5 , wherein the container tube ( 15 ) is realized with a lightweight structural material. 
     
     
         7 . A method for producing a container tube ( 15 ) with consecutive longitudinal sections of tube (kV) in the longitudinal direction having different wall thicknesses or inner or outer diameters, the method comprising:
 starting from a hollow or tubular blank ( 1 ), repeatedly drawing and wall ironing the blank by means of at least one drawing and wall ironing female die ( 6 ,  13 ,  16 ) applied to the outside of the blank towards a male die ( 9 ,  19 ,  22 ) in contact with the inside of the blank, the blank being stretched for at least a part of the longitudinal sections (kV) and its wall thickness or its inner or outer diameter becoming reduced by a specified dimension each time the blank is stretched, wherein for at least some of the longitudinal sections (kV) to be reduced in wall thickness or diameter, a change of the male die is carried out before at least one of the repeated drawings and wall ironings of the blank.