Method and device for closed-loop control of ram movement and ram forces in multi-point servo hybrid presses
AssigneeSchuler Pressen GmbH
InventorsUWE DARR, BERND MORITZ
Life of this patent
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Abstract
A method for the control of a ram movement and ram forces of multi-point servo hybrid presses, where the positions, speeds and forces to drive the ram can be controlled independently of each other by the servo motor, which is assigned to each pressure point or each group of pressure points, for the main drive for the ram movement in the main function and the hydraulic pressure cushions, which are separately assigned to each pressure point of the ram, in an auxiliary function, to influence process-induced position and force settings of the ram in a combinatory interaction to achieve an active control of draw depth and tilt.
Claims23
A method for the control of the ram movement and the ram forces of multi-point servo hybrid presses, where the positions, speeds and forces to drive the ram (4) can be controlled independently of each other by the servo motor (13), which is assigned to each pressure point (6, 8) or each group of pressure points (6, 7 and 8, 9), for the main drive for the ram movement in the main function and the hydraulic pressure cushions (15), which are separately assigned to each pressure point (6 to 9) of the ram (4), in an auxiliary function, to influence process-induced position and force settings of the ram (4) in a combinatory interaction to achieve an active control of draw depth and tilt.
A method for the control of the ram movement and the ram forces of multi-point servo hybrid presses, where the positions, speeds and forces to drive the ram (4) can be controlled independently of each other by the servo motor (13), which is assigned to each pressure point (6, 6.8) or each group of pressure points (6, 6.7 and 8.9, 9) for the main drive for the ram movement of the ram (4) as main function and the hydraulic pressure cushions (90), which are separately assigned to each pressure point (2 to 5) as an auxiliary function of the ram (4), in a combinatory interaction, to influence process-induced positional and force settings of the ram (4) which are required by the process for an active control of penetration depth and tilt.
A method for the control of the ram movement and the ram forces of multi-point servo hybrid presses, where the positions, speeds and forces to drive the ram (4) can be controlled independently of each other by the servo motor (13), which is assigned to each pressure point (6, 6.8) or each group of pressure points (6, 7 and 8, 9), of the main drive for the ram movement as main function of the ram (4) and the hydraulic pressure cushions (90), which are separately assigned to each pressure point (6 to 9) of the ram (4) in an auxiliary function, to influence, in a combinatory interaction, process-induced positional and force settings of the ram (4) which are required by the process for an active control of penetration depth and tilt.
A device to control the ram movement and the ram forces of servo-electric warm-forming machines, wherein,
- the positions, speeds and torques or forces of the servo motors (13) for driving the pressure points (6 to 9) of the ram (4) in the multi-point servo hybrid press can be controlled by means of a position cam disc (57) controlled by a virtual control shaft and the positions, speeds and forces of the hydraulic pressure cushions (15) assigned to the pressure points (6 to 9) of the ram 4 can each be controlled by an NC control device (18), and
- the key part of the NC control device (18) for the servo motors (13) separately assigned to each pressure point (6 to 9) of the ram (4) for the main drive and a functional unit for the sequential control (46) to control the force of the hydraulic pressure cushions (6 to 9) in the auxiliary function, comprises:
- a functional unit to store machine and die data (47);
- a functional unit to calculate the pressure point-specific curves of the target value of the force (48a) for the hydraulic pressure cushion (15);
- a functional unit for the force control of the hydraulic pressure cushions (50);
- a functional unit to calculate the target position curves for the pressure points of the ram with correction (52b);
- and
- a functional unit for the position control of the pressure points of the ram (54) in the main function.
A device to control the ram movement and the ram forces of servo-electric warm-forming machines, wherein,
- the positions, speeds and torques or forces of the servo motors (13) for driving the pressure points (6 to 9) of the ram (4) in the multi-point servo hybrid press can be controlled by means of a position cam disc (57) controlled by a virtual control shaft and the positions, speeds and forces of the hydraulic pressure cushions (15) assigned to the pressure points (6 to 9) of the ram 4 can each be controlled by an NC control device (18), and
- the key part of the NC control device (18) for the servo motors (13) separately assigned to each pressure point (6 to 9) of the ram (4) for the main drive and to control the force of the hydraulic pressure cushions (6 to 9) for the auxiliary function comprises:
- a sequential control (46);
- a storage device for machine and die data (47);
- a functional unit to calculate the pressure point-specific curves of the target force value (48a) for the hydraulic pressure cushions (15);
- a functional unit for the force control of the hydraulic pressure cushions (50.1);
- a functional unit to calculate the pressure point-specific curves of the target position with initial correction values (80);
- a functional unit for the position control of the pressure points of the ram (54) as the main function;
- a functional unit (81) to calculate the pressure point-specific force correction values (63), whose input values are the measurand signals of the actual force value (59) and actual temperature value (61) feedback, and whose output values summed together with the output values of the functional unit to calculate the pressure point-specific curves of the target force value (48a) determine the input values into the functional unit to control the force of the hydraulic pressure cushions (50.1);
- and
- a functional unit (82) to calculate the pressure point-specific positional offsets (67), whose input values are the measurand signals of the actual cushioning value (59) feedback and whose output values summed together with the output values of the functional unit to calculate the pressure point-specific curves of the target position with initial correction values (80) and the actual temperature value (61) feedback determine the input values into the functional unit for the positional control of the pressure points of the ram (54).
A device to control the ram movement and the ram forces of servo-electric warm-forming machines, wherein
- the positions, speeds and torques or forces of the servo motors (13) for driving the pressure points (6 to 9) of the ram (4) in the multi-point servo hybrid press can each be controlled by means of a position cam disc (57) controlled by a virtual control shaft and the positions, speeds and forces of the process cushions (90) for the second auxiliary function can each be controlled by an NC control device (18), and
- the key part of the NC control device (18) for the servo motors (13) separately assigned to each pressure point (6 to 9) of the ram (4) for the main drive and for the force control of the process cushions (90) for the second auxiliary function comprises:
- a functional unit for the sequential control (46);
- a functional unit to store machine and die data (47);
- a functional unit to calculate the cushion-specific curves of the target force value (91) for the process cushions (90);
- a functional unit for the force control of the process cushions (92);
- a functional unit to calculate the target position curves for the pressure points of the ram with correction (52b);
- and
- a functional unit for the position control of the pressure points of the ram (54) as the main function.
A device to control the ram movement and the ram forces of servo-electric warm-forming machines, wherein,
- the positions, speeds and torques or forces of the servo motors (13) for driving the pressure points (6 to 9) of the ram (4) in the multi-point servo hybrid press can each be controlled by means of a position cam disc (57) controlled by a virtual control shaft and the positions, speeds and forces of the process cushions (90) for the second auxiliary function can be controlled by an NC control device (18), and
- the key part of the NC control device (18) for the servo motors (13) separately assigned to each pressure point (6 to 9) of the ram (4) for the main drive and for the force control of the process cushions (90) for the second auxiliary function comprises:
- a sequential control (46);
- a storage device for machine and die data (47);
- a functional unit to calculate the cushion-specific curves of the target force value (91) for the process cushions (90);
- a functional unit for the force control of the process cushions (92);
- a functional unit to calculate the pressure point-specific curves of the target position with initial correction values (80);
- a functional unit for the position control of the pressure points of the ram (54) as the main function;
- a functional unit (93) to calculate the cushion-specific force correction values (63), whose input values are the measurand signals of the actual force value (59) and actual temperature value (61) feedback and whose output values summed together with the output values of the functional unit to calculate the cushion-specific curves of the target force value (91) determine the input values into the functional unit for the force control of the process cushions (92);
- and
- a functional unit (82) to calculate the pressure point-specific positional offsets (67), whose input values are the measurand signals of the actual cushioning value (59) feedback and whose output values summed together with the output values of the functional unit to calculate the pressure point-specific curves of the target position with initial correction values (80) and the actual temperature value (61) feedback determine the input values into the functional unit for the positional control of the pressure points of the ram (54).
A device to control the ram movement and the ram forces of servo-electric warm-forming machines, wherein,
- the positions, speeds and torques or forces of the servo motors (13) for driving the pressure points (6 to 9) of the ram (4) in the multi-point servo hybrid press can each be controlled by means of a position cam disc (57) controlled by a virtual control shaft and the positions, speeds and forces of the hydraulic pressure cushions (15) assigned to the pressure points (6 to 9) of the ram 4 for the first auxiliary function and the process cushions (90) for the second auxiliary function can each be controlled by an NC control device (18), and
- the key part of the NC control device (18) for the servo motors (13) separately assigned to each pressure point (6 to 9) of the ram (4) for the main drive and for the force control of the hydraulic pressure cushions (6 to 9) and for the force control of the process cushions (90) for the second auxiliary function comprises:
- a functional unit for the sequential control (46);
- a functional unit to store machine and die data (47);
- a functional unit to calculate the pressure point-specific curves of the target force value with correction (48b) for the hydraulic pressure cushions (15) of the first auxiliary function;
- a functional unit for the force control of the hydraulic pressure cushions (50);
- a functional unit to calculate the cushion-specific curves of the target force value (91) for the process cushions (90) of the second auxiliary function;
- a functional unit for the force control of the process cushions (92);
- a functional unit to calculate the target position curves for the pressure points of the ram (52a);
- and
- a functional unit for the position control of the pressure points of the ram (54) as the main function.
A device to control the ram movement and the ram forces of servo-electric warm-forming machines, wherein,
- the positions, speeds and torques or forces of the servo motors (13) for driving the pressure points (6 to 9) of the ram (4) in the multi-point servo hybrid press can each be controlled by means of a position cam disc (57) controlled by a virtual control shaft and the positions, speeds and forces of the hydraulic pressure cushions (15) assigned to the pressure points (6 to 9) of the ram 4 for the first auxiliary function and the process cushions (90) for the second auxiliary function can each be controlled by an NC control device (18), and
- the key part of the NC control device (18) for the servo motors (13) separately assigned to each pressure point (6 to 9) of the ram (4) for the main drive and for the force control of the hydraulic pressure cushions (6 to 9) and for the force control of the process cushions (90) for the second auxiliary function comprises:
- a sequential control (46);
- a storage device for machine and die data (47);
- a functional unit to calculate the pressure point-specific curves of the target force value (48a) for the hydraulic pressure cushions (15) of the first auxiliary function;
- a functional unit for the force control of the hydraulic pressure cushions (50.1);
- a functional unit to calculate the cushion-specific curves of the target force value (91) for the process cushions (90) of the second auxiliary function;
- a functional unit for the force control of the process cushions (92);
- a functional unit to calculate the pressure point-specific curves of the target position with initial correction values (80);
- a functional unit for the position control of the pressure points of the ram (54) as the main function;
- a functional unit (81) to calculate the pressure point-specific force correction values (63), whose input values are the measurand signals of the actual cushioning value (56) feedback;
- and whose output values summed together with the output values of the functional unit to calculate the pressure point-specific curves of the target force value (48a) determine the input values into the functional unit for the force control of the hydraulic pressure cushions (50.1);
- and
- a functional unit (93) to calculate the cushion-specific force correction values (63), whose input values are the measurand signals of the actual force value (59) and actual temperature value (61) feedback and whose output values summed together with the output values of the functional unit to calculate the cushion-specific curves of the target force value (91) determine the input values into the functional unit for the force control of the hydraulic bed cushions (92).
Dependencies are inferred from the claim text.