Modular Forming Tool, Modular Forming Tool Set and Method for Producing Substantially Rotationally Symmetrical Parts

Abstract

Modular forming tool ( 1 ), in particular pressing tool, preferably for producing essentially rotationally symmetrical parts, comprising at least one primary tool ( 10 ), in particular a core, at least one reinforcing tube ( 30 ) and at least one auxiliary tool ( 50 ), the forming tool ( 1 ) extending along a longitudinal extension direction (L), the primary tool ( 10 ) having a workpiece machining surface ( 12 ), a sheath surface ( 14 ) and two end surfaces ( 16 ), the workpiece machining surface ( 12 ) contacting or being designed to contact a workpiece, the sheath surface ( 14 ) delimiting the primary tool ( 10 ) in a radial direction (R), wherein the end surfaces ( 16 ) delimit the primary tool ( 10 ) in the longitudinal extension direction (L), wherein the reinforcing tube ( 30 ) has an inner sheath surface ( 32 ) and an outer sheath surface ( 34 ), wherein the primary tool ( 10 ) is pressed into the reinforcing tube ( 30 ) indirectly and/or directly via the sheath surface ( 14 ), so that the primary tool ( 10 ) is secured relative to the reinforcing tube ( 30 ) in the radial direction (R), wherein the inner sheath surface ( 32 ) and the outer sheath surface ( 34 ) each have an interference fit, wherein the auxiliary tool ( 50 ) is bounded in the longitudinal direction of extension (L) by cover surfaces ( 56 ), wherein the auxiliary tool ( 50 ) is bounded outwardly in the radial direction (R) by a circumferential surface ( 54 ), and wherein the circumferential surface ( 54 ) has a clearance fit in the radial direction (R).

1 . Modular forming tool ( 1 ), in particular press tool,
 comprising at least one primary tool ( 10 ), in particular a core,   at least one reinforcement tube ( 30 ) and   at least one auxiliary tool ( 50 ),   wherein the forming tool ( 1 ) extends along a longitudinal extension direction (L),   wherein the primary tool ( 10 ) has a workpiece machining surface ( 12 ), a sheath surface ( 14 ), and two end surfaces ( 16 ),   wherein the workpiece machining surface ( 12 ) contacts or is adapted to contact a workpiece,   wherein the sheath surface ( 14 ) bounds the primary tool ( 10 ) in a radial direction   (R),   wherein the end surfaces ( 16 ) delimit the primary tool ( 10 ) in the longitudinal extension direction (L),   wherein the reinforcing tube ( 30 ) has an inner sheath surface ( 32 ) and an outer sheath surface ( 34 ),   wherein the primary tool ( 10 ) is pressed into the reinforcing tube ( 30 ) indirectly and/or directly via the sheath surface ( 14 ), so that the primary tool ( 10 ) is secured relative to the reinforcing tube ( 30 ) in the radial direction (R),   wherein the inner sheath surface ( 32 ) and the outer sheath surface ( 34 ) each have an interference fit,   wherein the auxiliary tool ( 50 ) is limited in the longitudinal extension direction (L) by cover surfaces ( 56 ),   wherein the auxiliary tool ( 50 ) is bounded outwardly in the radial direction (R) by a circumferential surface ( 54 ),   wherein the circumferential surface ( 54 ) has a clearance fit in the radial direction (R), and   wherein the modular forming tool ( 1 ) is a punch.   
     
     
         2 . Modular forming tool ( 1 ) according to  claim 1 ,
 wherein the forming tool ( 1 ) has an outer tool holder ( 60 ),   wherein all of the primary tools ( 10 ), reinforcing tubes ( 30 ) and auxiliary tools ( 50 ) of the forming tool ( 1 ) extend at least partially within the tool holder ( 60 ).   
     
     
         3 . Modular forming tool ( 1 ) according to  claim 1 ,
 wherein at least one cover surface ( 56 ) of an auxiliary tool ( 50 ) directly contacts a reinforcing tube ( 30 ) and/or a primary tool ( 10 ).   
     
     
         4 . Modular forming tool ( 1 ) according to  claim 1 ,
 wherein at least one cover surface ( 56 ) of an auxiliary tool ( 50 ) is free of reinforcement tube contact and/or primary tool contact.   
     
     
         5 . Modular forming tool ( 1 ) according to  claim 1 ,
 wherein the outer dimension of the circumferential surface ( 54 ) of at least one auxiliary tool ( 50 ) substantially corresponds to the nominal dimension of the outer sheath surface ( 34 ) of a reinforcing tube ( 30 ).   
     
     
         6 . Modular forming tool ( 1 ) according to  claim 1 ,
 wherein the forming tool ( 1 ) comprises a plurality of reinforcing tubes ( 30 ),   wherein the reinforcing tubes ( 30 ) surround the primary tool ( 10 ), in particular all primary tools ( 10 ), in the radial direction (R).   
     
     
         7 . Modular forming tool ( 1 ) according to  claim 1 ,
 wherein at least one end surface ( 16 ) of a primary tool ( 10 ), in particular of each primary tool ( 10 ), terminates flush in the longitudinal extension direction (L) with a reinforcing tube ( 30 ).   
     
     
         8 . Modular forming tool ( 1 ) according to  claim 1 ,
 wherein at least one end surface ( 16 ) of a primary tool ( 10 ), in particular of each primary tool ( 10 ), terminates flush in the longitudinal extension direction (L) with all reinforcing tube(s) ( 30 ) surrounding the respective primary tool ( 10 ).   
     
     
         9 . Modular forming tool ( 1 ) according to  claim 1 ,
 wherein the reinforcing tubes ( 30 ) and/or the auxiliary tools ( 50 ) are made of rolling bearing steel.   
     
     
         10 . Modular forming tool ( 1 ) according to  claim 1 ,
 wherein the reinforcing tubes ( 30 ) are formed such that all reinforcing tubes ( 30 ) having substantially the same outer dimension in radial direction (R) also have substantially the same inner dimension in radial direction (R).   
     
     
         11 . Modular forming tool ( 1 ) according to  claim 1 ,
 wherein at least the inner reinforcing tubes ( 30 ), preferably all reinforcing tubes ( 30 ), are formed such that the ratio of the inner dimension in radial direction (R) to the outer dimension in radial direction (R) is in a range of 0.7 to 0.98, preferably in a range of 0.8 to 0.97 and particularly preferably in a range of 0.85 to 0.95.   
     
     
         12 . Modular forming tool ( 1 ) according to  claim 1 ,
 wherein the modular forming tool ( 1 ) is limited in longitudinal extension direction (L) by a screw plug ( 70 ).   
     
     
         13 . Modular forming tool ( 1 ) according to  claim 1 ,
 wherein the screw plug ( 70 ) has a threaded section ( 72 ),   wherein the threaded section ( 72 ) has a nominal diameter that is between an inner   dimension and an outer dimension of a reinforcing tube ( 30 ) of the forming tool ( 1 ).   
     
     
         14 . Modular forming tool set comprising two modular forming tools ( 1 ) according to  claim 1 ,
 wherein the one modular forming tool is a punch ( 2 ), and   wherein the second modular forming tool ( 1 ) is a die ( 3 ).   
     
     
         15 . Method of manufacturing substantially rotationally symmetrical parts comprising the steps:
 Provision of a workpiece blank and   Forming the workpiece blank by a modular forming tool ( 1 ) according to  claim 1 .