Device for stamping and punching through a sheet-like workpiece

Abstract

A device for stamping a depression in a sheet-like workpiece and for piercing the workpiece in the region of the stamped depression, including a punch unit and a die unit between which the workpiece can be positioned. The punch unit has a punch with a forming punch and with a piercing punch. The forming punch bears against a side of the workpiece in the region of the depression during the stamping of the depression. The piercing punch pierces the workpiece in the region of the depression. The forming punch and the piercing punch are moved along a joining axis of the device. The forming punch and the piercing punch are accommodated in a punch housing, and the forming punch and the piercing punch are driven via a common hydraulic supply system relative to the punch housing along the joining axis of the device.

1 . A device for stamping a depression in a sheet-like workpiece and for piercing the workpiece in the region of the stamped depression, comprising a punch unit and a die unit opposite the punch unit, wherein the workpiece which can be processed by the device can be positioned between the punch unit and the die unit, wherein the punch unit has a punch with a forming punch and with a piercing punch, wherein the forming punch is designed to come to bear against a side of the workpiece in the region of the depression during the stamping of the depression, and wherein the piercing punch is configured to pierce the workpiece in the region of the depression, wherein the forming punch and the piercing punch can be moved by being driven along a joining axis of the device, wherein the forming punch and the piercing punch are accommodated in a punch housing, wherein the forming punch and the piercing punch can be driven via a common hydraulic supply system relative to the punch housing along the joining axis of the device. 
     
     
         2 . The device as claimed in  claim 1 , wherein the punch unit has a first hydraulic space and a second hydraulic space which are hydraulically separated from each other inside the punch housing. 
     
     
         3 . The device as claimed in  claim 2 , wherein the first hydraulic space is connected to the hydraulic supply system via a first hydraulic connection. 
     
     
         4 . The device as claimed in  claim 2 , wherein the second hydraulic space of the punch unit is connected to the hydraulic supply system via a second hydraulic connection. 
     
     
         5 . The device as claimed in  claim 2 , wherein the first hydraulic space and the second hydraulic space are connected to a high-pressure space of the hydraulic supply system. 
     
     
         6 . The device as claimed in  claim 2 , wherein the first hydraulic space of the punch unit only acts on a forward stroke side of the piercing punch. 
     
     
         7 . The device as claimed in  claim 2 , wherein the second hydraulic space of the punch unit acts on a return stroke side of the piercing punch and on a forward stroke side of the forming punch. 
     
     
         8 . The device as claimed in  claim 3 , wherein the first hydraulic connection comprises a valve arrangement for opening and/or closing the first hydraulic connection. 
     
     
         9 . The device as claimed in  claim 4 , wherein the second hydraulic connection cannot be shut off. 
     
     
         10 . The device as claimed in  claim 2 , wherein the first hydraulic space is connected to a low-pressure space of the hydraulic supply system. 
     
     
         11 . The device as claimed in  claim 3 , wherein the first hydraulic connection is connected to a low-pressure space of the hydraulic supply system via an interconnection. 
     
     
         12 . The device as claimed in  claim 8 , wherein the valve arrangement for opening and/or closing a connecting section is formed between the high-pressure space and the interconnection. 
     
     
         13 . The device as claimed in  claim 1 , wherein the hydraulic supply system comprises a hydropneumatic pressure intensifier device. 
     
     
         14 . The device as claimed in  claim 1 , further comprising a drive designed to drive the punch unit in such a way that the forming punch and the piercing punch can be driven jointly relative to the die unit along the joining axis of the device.