Blank holder device for a drawing device for producing hollow cylindrical bodies

Abstract

A blank holder device for a drawing device, for example a drawing press. The blank holder device has a blank holder sleeve, which, in a predetermined position exerts a blank holder force on a blank part. The sleeve is fastened to a head part and is stationary relative to it. To move the blank holder sleeve in a stroke direction, the head part is borne, through a head part guiding arrangement, at least at two front guide locations, to undergo translational motion in a stroke direction, and it is braced to be essentially stationary in all directions at right angles to the stroke direction. On the side opposite the blank holder sleeve, the head part is connected with at least one drive element of the blank holder drive device and that can, together with the head part, be moved by a motor and a coupling arrangement in the stroke direction.

What is claimed is: 
     
         1 . A blank holder device ( 22 ) for a drawing device ( 10 ) for producing hollow cylindrical bodies, with a blank holder sleeve ( 43 ) that is fastened to a head part ( 23 ), with a blank holder drive device ( 24 ) that has at least one drive element ( 25 ) that is translation-movable in a stroke direction (H) at which the head part ( 23 ) is arranged, the blank holder drive device ( 24 ) being adapted to move the blank holder sleeve ( 43 ) in a stroke direction (H) between an initial position (I) and a blank holder position (II), the blank holder sleeve ( 43 ) having a sleeve end face ( 44 ) that, in the blank holder position (II), presses a blank part ( 14 ) with a blank holder force (F) against a clamping surface ( 62 ), with a head part guiding arrangement ( 50 ) that is adapted to translation-movably bear the head part ( 23 ) in the stroke direction (H) at least at two front guide locations ( 51 ), and to support it against movements in other degrees of freedom. 
     
     
         2 . A blank holder device according to  claim 1 , characterized in that the head part guiding arrangement ( 50 ) has at least two head part guiding units ( 52 ), each of which has a guide element ( 53 ) extending in a stroke direction (H) and a guide bearing part ( 55 ) slidably borne at it. 
     
     
         3 . A blank holder device according to  claim 2 , characterized in that the guide element ( 53 ) is formed by a guide rod ( 54 ) and that the guide bearing part ( 55 ) surrounds the guide rod ( 54 ) at the respective front guide location ( 51 ). 
     
     
         4 . A blank holder device according to  claim 2 , characterized in that the guide bearing parts ( 55 ) of the head part guiding units ( 52 ) are arranged at the head part ( 23 ) and that the guide elements ( 53 ) are arranged at a machine frame or a machine base ( 39 ). 
     
     
         5 . A blank holder device according to  claim 4 , characterized in that the head part ( 23 ) extends in a transverse direction (Q) at a right angle to the stroke direction (H) from one of the guide elements ( 53 ) to another one of the guide elements ( 53 ). 
     
     
         6 . A blank holder device according to  claim 2 , characterized in that two of the at least two front guide locations ( 51 ) of the head part guiding arrangement ( 52 ) are arranged with a first transverse spacing (d 1 ) in a transverse direction (Q) at right angles to the stroke direction (H). 
     
     
         7 . A blank holder device according to  claim 1 , characterized in that a drive guide arrangement ( 63 ) is provided that bears the at least one drive element ( 25 ) of the blank holder drive device ( 24 ) translation-movable at least at one back guide location ( 64 ). 
     
     
         8 . A blank holder device according to  claim 7 , characterized in that at least two drive elements ( 25 ) are provided, each of which is translation-movably borne at a back guide location ( 64 ) by the drive guide arrangement ( 63 ), a second transverse spacing (d 2 ) of the back guide locations ( 64 ) being smaller in a transverse direction (Q) at a right angle to the stroke direction (H) than a first transverse spacing (d 1 ) of the front guide locations ( 51 ) of the head part guiding arrangement ( 50 ). 
     
     
         9 . A blank holder device according to  claim 7 , characterized in that the back guide locations ( 64 ) are arranged with a spacing to the head part ( 23 ) in a stroke direction (H). 
     
     
         10 . A blank holder device according to  claim 1 , characterized in that the blank holder drive device ( 24 ) has a motor ( 31 ) and a coupling arrangement ( 30 ), that is coupled with the at least one drive element ( 25 ) at a coupling location ( 29 ), and creating a drive connection between the motor ( 31 ) and the at least one drive element ( 25 ). 
     
     
         11 . A blank holder device according to  claim 7 , characterized in that the blank holder drive device ( 24 ) has a motor ( 31 ) and a coupling arrangement ( 30 ), that is coupled with the at least one drive element ( 25 ) at a coupling location ( 29 ), and creating a drive connection between the motor ( 31 ) and the at least one drive element ( 25 ), every drive element ( 25 ) is borne at a back guide location ( 64 ) between the coupling location ( 29 ) and the head part ( 23 ). 
     
     
         12 . A blank holder device according to  claim 11 , characterized in that every drive element ( 25 ) extends away from the head part ( 23 ) in a stroke direction (H), starting from the coupling location ( 29 ), toward a back end ( 28 ), and is borne at a back guide location ( 64 ) between the coupling location ( 29 ) and the back end ( 28 ). 
     
     
         13 . A blank holder device according to  claim 1 , characterized in that the head part ( 23 ) has a central through opening ( 71 ) for a drawing punch ( 12 ) that is arranged movably along a main axis (A) in the stroke direction (H). 
     
     
         14 . A blank holder device according to  claim 10 , characterized in that the blank holder sleeve ( 43 ) is arranged coaxial with the main axis (A). 
     
     
         15 . A blank holder device according to  claim 7 , characterized in that the blank holder drive device ( 24 ) has a motor ( 31 ) and a coupling arrangement ( 30 ), that is coupled with the at least one drive element ( 25 ) at a coupling location ( 29 ), and creating a drive connection between the motor ( 31 ) and the at least one drive element ( 25 ), every drive element ( 25 ) extends away from the head part ( 23 ) in a stroke direction (H), starting from the coupling location ( 29 ), toward a back end ( 28 ), and is borne at a back guide location ( 64 ) between the coupling location ( 29 ) and the back end ( 28 ).