Die cushion apparatus of press machine

Abstract

A die cushion apparatus of a press machine which makes possible to manufacture a plurality of types of products of different sizes by one press machine and capable of minimizing a production facility, and which comprises a plurality of die cushion units, each having a cushion pad and a rise and fall drive unit for vertically driving the cushion pad, that are aligned in a direction perpendicular to a work conveying direction, and a control unit capable of individually and independently controlling the plurality of die cushion units.

1 . A die cushion apparatus of a press machine, comprising: 
 a plurality of die cushion units each having a cushion pad and an elevating drive unit that vertically moves the cushion pad, wherein    all the die cushion units are aligned in a line in a bed in a direction perpendicular to a work conveying direction in a positional state for use simultaneously in one step of pressing, and    the cushion pad of at least one die cushion unit moves in a vertical direction individually and independently from other of the cushion pads of the plurality of die cushion units.    
   
   
       2 . The die cushion apparatus of the press machine according to  claim 1 , further comprising a control unit individually and independently controlling the plurality of die cushion units.  
   
   
       3 . The die cushion apparatus of the press machine according to  claim 2 , wherein the control unit controls the plurality of die cushion units in synchronism with each other that are operated for a work common to each other.  
   
   
       4 . The die cushion apparatus of the press machine according to  claim 1 , wherein the plurality of die cushion units operate synchronously with each other for forming different works.  
   
   
       5 . The die cushion apparatus of the press machine according to  claim 2 , wherein the control unit controls the plurality of die cushion units to operate synchronously with each other for forming different works.  
   
   
       6 . The die cushion apparatus of the press machine according to  claim 2 , wherein, when a width of a work in the alignment direction of the plurality of die cushion pads is narrow, the control unit controls only the cushion pad that is located at a press center.