Method for operating a punching press

A method for operating a punching press with a press plunger driven by a crank or eccentric drive with a first part of a machining tool, wherein the press plunger works in a machining zone of the punching press against a stationary clamping plate with an associated second part of the machining tool, and with a servo feed apparatus for intermittently feeding a band of material to be machined to the machining zone of the punching press,

• wherein in the intended punching operation of the punching press
• a) the press plunger is moved back and forth by the crank or eccentric drive between a first movement dead point (0°), in which the press plunger is at maximum distance from the clamping plate and the machining tool is at maximum opening, and a second movement dead point (180°), in which the press plunger is at minimum distance from the clamping plate and the machining tool is at maximum closing,
• b) the material band is advanced into the machining zone by a certain length in a first rotation angle window of the crank or eccentric drive around the first movement dead point (0°) by the servo feed apparatus and is machined with the machining tool in the feed pauses in a second rotation angle window of the crank or eccentric drive, which extends outside the first rotation window before and up to the second movement dead point (180°),
• c) the feed movement of the servo feed apparatus takes place according to an electronically defined feed movement profile, which is electronically synchronized to the rotation of the crank or eccentric drive in the first rotation angle window,
• wherein when a press stop is triggered outside the first rotation angle window, in the event that the rotation of the crank or eccentric drive after the triggering of the press stop does not come to a standstill latest at a certain rotation angle before the subsequent first rotation angle window or before entry into the subsequent first rotation angle window, the synchronization of the feed movement profile with the rotation of the crank or eccentric drive is cancelled when the first rotation angle window is reached and the feed movement profile is then followed independently of the rotation of the crank or eccentric drive.

A method for operating a punching press with a press plunger driven by a crank or eccentric drive with a first part of a machining tool, wherein the press plunger works in a machining zone of the punching press against a stationary clamping plate with an associated second part of the machining tool, and with a servo feed apparatus for intermittently feeding a band of material to be machined to the machining zone of the punching press,

• wherein in the intended punching operation of the punching press
• a) the press plunger is moved back and forth by the crank or eccentric drive between a first movement dead point (0°), in which the press plunger is at maximum distance from the clamping plate and the machining tool is at maximum opening, and a second movement dead point (180°), in which the press plunger is at minimum distance from the clamping plate and the machining tool is at maximum closing,
• b) the material band is advanced into the machining zone by a certain length in a first rotation angle window of the crank or eccentric drive around the first movement dead point (0°) by the servo feed apparatus and is machined with the machining tool in the feed pauses in a second rotation angle window of the crank or eccentric drive, which extends outside the first rotation window before and up to the second movement dead point (180°),
• c) the feed movement of the servo feed apparatus takes place according to an electronically defined feed movement profile, which is electronically synchronized to the rotation of the crank or eccentric drive in the first rotation angle window,
• wherein when a press stop is triggered outside the first rotation angle window, the synchronization of the feed movement profile with the rotation of the crank or eccentric drive is cancelled and no further feed movement of the servo feed apparatus takes place until a new start request is made.