PURPOSE: A motor press working machine is provided to reduce the time for the first process of press forming by transferring an upper die at a high speed and to increase torque during a process. CONSTITUTION: A motor press working machine comprises a slider(5) having a frame(4) and an upper die(6) and sliding along a pillar(3), a connecting unit for upwardly and downwardly moving the slider via a ball screw shaft(19) driven by an AC servo motor(9), and a lower die(22). Based on the position signals detected by a continuously variable transmission(10) installed between the AC servo motor and the ball screw shaft and a pulse scale(23) detecting the position of the upper die, the upper die pressurizes a workpiece(24) placed on the lower die. During a press forming process, the AC servo motor is in a torque increase mode. Otherwise, the upper die is rapidly lifted up and down by a controller(25).

Title
Motor press working machine having controller for rapidly lifting up and down upper die by detecting contacting position of upper die and workpiece and using continuously variable transmission
Application Number
1020040012559
Publication Number
1020040080973
Application Date
February 25, 2004
Publication Date
September 20, 2004
Inventor
Unno Keizo
Futamura Shoji
Assignee
Institute Of Technology Precision Electrical Discharge Works
IPC
B30B 01/18