Machine tool and method for controlling a machine tool
AssigneeSMW-Autoblok Spannsysteme GmbH
InventorEckhard Maurer
Life of this patent
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Abstract
It is already know from the prior art to provide machine tools with a clamping device, in which a portion of the control is transferred to the clamping device. This simplifies the connection to the available machine control and allows a simplified coupling of the clamping device to the machine tool. However, in spite of the inductive coupling between the machine control and the clamping device control, it is not ensured that process data sets reach their intended destination. This situation is addressed by the present invention in that a clamping device control is allocated to the clamping device, two redundant microprocessors are included, which analyze received process data sets independently of each other and, in the case of an error, transfer the clamping device into a safe state.
Claims12
A machine tool with a stationary machine control (10) and a rotating clamping device (1), wherein the machine control (10) communicates with a clamping device control (20) that is rotating with the rotating clamping device (1) with the intermediate connection of a coupling unit (7), wherein the coupling unit (7) provides a contactless data connection from the machine control (10) to the clamping device control (20), wherein the clamping device control (20) comprises a control unit (21) for actuating advancement means for activating clamping means (2, 3) of the rotating clamping device (1) and at least two redundant microprocessors (22, 23) allocated to the control unit (21), via which process data sets received by the machine control (10) via the control unit (21) can be verified independently of each other and/or process data received by process sensors can be used independently of each other in process data sets and can be transmitted via the control unit (21) to the machine control (10),
- characterized in that respectively at least one force sensor (35, 36) or clamping signal transmitter is allocated to the clamping means (2, 3) and the at least one force sensor (35, 36) or clamping signal transmitter is respectively data-connected solely with one of the at least two redundant microprocessors (22, 23), or the at least one force sensors (35, 36) or clamping signal transmitters of the clamping means (2, 3) are allocated to the at least two redundant microprocessors (22, 23), and the at least one force sensors (35, 36) or clamping signal transmitters of opposing clamping means of the clamping means (2, 3) are allocated to different microprocessors of the at least two redundant microprocessors (22, 23).
A method for controlling a machine tool with a stationary machine control (10) and a rotating clamping device (1), wherein the machine control (10) communicates with a clamping device control (20) that is rotating with the rotating clamping device (1) with the intermediate connection of a coupling unit (7), wherein the coupling unit (7) provides a contactless data connection from the machine control (10) to the clamping device control (20), and the clamping device control (20) comprises a control unit (21) for actuating advancement means for activating clamping means (2, 3) of the rotating clamping device (1), and process data sets sent by the machine control (10) to the clamping device control (20) are independently checked by two redundant microprocessors (22, 23) and/or the two redundant microprocessors (22, 23) use process data received from process sensors independently of each other to generate process data sets and transmit the process data sets to the machine control (10) via the control unit (21),
- characterized in that that respectively at least one force sensor (35, 36) or clamping signal transmitter is allocated to the clamping means (2, 3), and process data sets sent therefrom are respectively checked solely by one of the two redundant microprocessors (22, 23), or the at least one force sensors (35, 36) or clamping signal transmitters of the clamping means (2, 3) are allocated to the two redundant microprocessors (22, 23) and the at least one force sensors (35, 36) or clamping signal transmitters of opposing clamping means of the clamping means (2, 3) are allocated to different microprocessors of the two redundant microprocessors (22, 23) for checking the process data sets that are sent.
Dependencies are inferred from the claim text.