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US 12,427,564 B2Granted
Forming press and method for operating a forming press
AssigneeFiessler Elektronik GmbH & Co. KG
InventorLutz Fiessler
Life of this patent
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Abstract
A forming press having a machine bed on which a first tool is arranged, and having a tool carrier which is accommodated to the machine bed such that it can move relative thereto and further including a second tool and a drive for moving the tool carrier and a machine control for controlling the drive, and having a safety control for disabling the drive, wherein the safety control deactivates a first radiation detector if a first status signal, which results from a comparison between a first current position value with a first deactivation position value matches with a second status signal which results from a comparison between a second current position value with the first deactivation position value.
Claims10
A forming press comprising:
- a machine bed, on which a first tool is arranged;
- a tool carrier which is accommodated on the machine bed so as to be relatively movable with respect to the machine bed, wherein a second tool is accommodated to the tool carrier;
- a drive for moving the tool carrier, wherein the first tool and the second tool determine a working gap of variable size;
- a machine control for controlling the drive;
- and
- a safety control for disabling the drive, the safety control being connected to at least one radiation source which provides radiation beams and the safety control being further connected to a plurality of radiation detectors, which radiation detectors are arranged opposite the radiation source,
- wherein at least part of the radiation beams emanating from the radiation source being aligned along a working edge of the first tool, the drive comprising a position measuring system which provides a position signal as a function of a position of the tool carrier relative to the machine bed, the same position signal being provided to both the machine control and the safety control,
- wherein the machine control comprises at least one processor for cyclic processing of said position signal provided by the position measuring system in a first fast working cycle to calculate a first position value,
- wherein the safety control comprises at least one processor for cyclic processing of said position signal provided by the position measuring system in a second, slow operating cycle to calculate a second position value, wherein the second, slow operating cycle of the safety control is longer than the first fast working cycle of the machine control, and wherein the second position value is calculated using only said position signal provided by the position measuring system,
- wherein the safety control compares a first status signal with a second status signal for a deactivation of a first radiation detector at a predetermined first deactivation position, wherein the first status signal is determined by a comparison of a first current position value with a first deactivation position value,
- wherein the first current position value is obtained by adding a first position correction value to the first position value,
- wherein the second status signal is determined by a comparison of a second current position value with the first deactivation position value, wherein the second current position value is obtained by adding a second position correction value to the second position value, and
- wherein the safety control carries out the deactivation when the first status signal matches the second status signal.
10 more elements
A method for operating a forming press, comprising the steps:
- determining a position signal of a position measuring system for calculating a time-variable distance between a first tool, which is arranged on a machine bed, and a second tool, which is fixed to a tool carrier accommodated to the machine bed in a relatively movable manner and which position measuring system detects a size of a variable working gap between the second tool and the first tool;
- processing the position signal in at least one processor of a machine control, which machine control is operated with a first, fast working cycle, to calculate a first position value based on the position signal determined by the position measuring system;
- and
- processing the position signal in at least one processor a safety control which is operated with a second, slow operating cycle, to calculate a second position value, the second position value being calculated using only the position signal provided by the position measuring system,
- wherein the second, slow operating cycle of the safety control is longer than the first, fast working cycle of the machine control, and
- wherein the safety control processes a first detector signal of a first radiation detector and processes a second detector signal of a second radiation detector, which are disposed at a first lateral end portion of the second tool and which are illuminated by a radiation source oppositely disposed at a second end portion of the second tool, and
- wherein a distance of the first radiation detector from the second tool is greater than a distance of the second radiation detector from the second tool, and
- wherein the machine control provides a power supply for the drive, which drive is coupled to the tool carrier, if a gap width of the working gap is greater than a predetermined gap width, in order to reduce the gap width of the working gap with a first approach speed between the first tool and the second tool, the safety control carrying out a comparison between a first status signal and a second status signal, and
- wherein the first status signal is obtained by the machine control or by the safety control by a comparison of a first current position value with a first deactivation position value, wherein the first current position value is obtained by adding a first position correction value and the first position value, and
- wherein the second status signal is obtained by comparing a second current position value with the first deactivation position value, wherein the second current position value is obtained by adding a second position correction value and the second position value, and
- wherein the first radiation detector is deactivated when there is a match between the first status signal and the second status signal to avoid a disabling of the drive by the safety control due to an undesired interruption of the detection beams impinging on the radiation detector.
8 more elements
Dependencies are inferred from the claim text.