Importance

Loading Importance Indicators...

Abstract

A method for operating a punching press with a press plunger driven by a crank drive, which operates in a machining zone of the punching press against a stationary clamping plate, and with a servo feed apparatus for intermittently feeding a band of material to be processed to the machining zone. In punching mode, the press plunger is moved back and forth by the crank drive between a first movement dead point (0°), in which the press plunger is at maximum distance from the clamping plate, and a second movement dead point (180°), in which the press plunger is at minimum distance from the clamping plate. In the process, the material band is pushed by the servo feed apparatus around the first movement dead point (0°) in a first rotation angle window (3) of the crank drive by a certain length into the machining zone and processed in a second rotation angle window during the feed pauses. The feed movement of the servo feed drive takes place according to an electronically defined feed movement profile (5), which is followed in the first rotation angle window (3) in an electronically synchronized manner to the rotation of the crank drive (4). When a press stop (6) is triggered in the first rotation angle window (3), the synchronization of the feed movement profile (5) with the rotation of the crank drive (4) is canceled and the feed movement profile (5) is moved to the end independently of the rotation of the crank drive (4). This mode of operation reduces the maximum torque requirement of the feed axes for servo feeds operated angularly synchronously with the crank drive of the press plunger, so that smaller and therefore more cost-effective servo drives can be used or more load can be moved with a given servo drive.

Loading the Abstract Image...

First Claim