WO2022216246A1 - A press control method - Google Patents
A press control method Download PDFInfo
- Publication number
- WO2022216246A1 WO2022216246A1 PCT/TR2021/050711 TR2021050711W WO2022216246A1 WO 2022216246 A1 WO2022216246 A1 WO 2022216246A1 TR 2021050711 W TR2021050711 W TR 2021050711W WO 2022216246 A1 WO2022216246 A1 WO 2022216246A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- torque
- servo motor
- measurement module
- calculating
- module
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000005259 measurement Methods 0.000 claims abstract description 20
- 238000004364 calculation method Methods 0.000 claims abstract description 10
- 230000001105 regulatory effect Effects 0.000 claims 1
- 238000004458 analytical method Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000009740 moulding (composite fabrication) Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000002986 genetic algorithm method Methods 0.000 description 1
- 230000002068 genetic effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/14—Control arrangements for mechanically-driven presses
Definitions
- the present invention relates to a press control method for increasing the performance of a mechanical press with a hybrid mechanism used in processes such as forming, bending, punching, cutting, and drawing.
- Presses which are among the primary industrial machines today, are generally examined in two main groups. These are hydraulic presses and mechanical presses. Mechanical presses operate with the principle of transferring the kinetic energy accumulated by means of rotation of the flywheel onto the ram as force by a mechanism.
- servo press servo motor controlled presses
- servo motor curves are not distributed equally on the operating area. It reaches excessive torque/speed in one area, while torque/speed values remain low in another area. Therefore, the press cannot be accelerated as much as required. Since there is no die weight recognition and load entry point detection method in the press control methods used in the state of the art, the operation of the press is left to the operator's knowledge.
- Patent application no 2011/09163 known in the state of the art, discloses a servo mechanical press system with a hybrid mechanism.
- the press system comprises a frame, at least one cavity inside the frame, at least one flywheel which provides the mechanical energy required for the system, at least one motor which enables the flywheel to rotate, at least one upper mechanism which operates with the mechanical energy stored by the flywheel, at least one servo motor which converts the electric energy into mechanical energy, at least one lower mechanism which operates with the mechanical energy generated by the servo motor.
- the energy used in the invention of the application cannot be evenly distributed within the mechanism, and more energy is used in the press system and it not achieved sufficient performance. For this reason, the production rate decreases.
- the objective of the present invention is to provide a press control method for the press with hybrid mechanism to use the energy more efficiently.
- the objective of the present invention is to provide a press control method for a press system which increases production rate in dies used for processes such as forming, bending, punching, cutting, and drawing.
- a press control method preferably for more efficient operation of the servo mechanical press comprises the steps of - resetting the pressure of the pneumatic cylinders, torque measurement module making torque measurement through the crank link of the servo motor at certain points, calculating module calculating the die weight according to the torque values, calculating module calculating and applying the suitable pneumatic pressure according to the calculated die weight, recording information such as values of links of the servo hybrid mechanical press, servo motor torque and speed, product length limit, etc.
- product length measurement module determining the height of the product by means of dynamic calculation at the point at which the torque of the servo motor increases during the learning strokes, controller determining at least one control point according to the stroke, product length, upper dwell values, the controller calculating the value of shifting the servo motor motion profile so as to provide maximum spm (strokes per minute) or minimum torque according to the information received from the torque measurement module, calculation module, product length measurement module.
- the smart press control method of the present invention relates to a control method which enables to increase the performance of the servo hybrid mechanical press.
- the servo-mechanical press system with hybrid mechanism comprises a flywheel, a motor which enables the flywheel to be rotated and which is connected to the flywheel, an upper mechanism which operates with the mechanical energy generated by the flywheel, a servo motor which converts the electric energy into mechanical energy, and a lower mechanism which operates with the mechanical energy generated by the servo motor.
- the control method first it is required to determine the die weight of the press. Pneumatic balancing cylinder pressures are reset or fixed at a determined level.
- the torque measurement module performs torque measurement at certain angles of the crank link of the servo motor.
- the calculation module calculates the die weight from the kinetostatic. In this calculation, mass will be determined by comparing the force analysis performed with the ram without die in the static condition and the force analysis results in the state with the die.
- the link values of the servo hybrid mechanical press, inertial values, pneumatic cylinder diameter, expansion tank volumes, maximum product length, maximum and minimum stroke height, servo motor torque and speed value, maximum torque and speed of constant velocity motor of flywheel, transfer ratio of the servo motor, reference force value of the servo motor are recorded in the database.
- the motion profile relative to the maximum part length will be determined and the first stroke will be made.
- the product length measurement module determines the height of the product by comparing the torque value corresponding to the specific height in the servo torque value motion profile with the T ref value. If the torque value corresponding to the specific height in the servo torque value motion profile is lower than the T ref value, the height value will be decreased and the most suitable height value will be determined by continuing the trials until the T ref value is achieved.
- the controller determines more than one control point on the movement axis after determining the stroke height, product length, and upper dwell values.
- the controller calculates the maximum spm with optimum shifting value to minimize the maximum torque value or maximizes upper dwell value. Offsetting fall and rise zones to the right or left along the master axis, provided that the profile of the motion profile during forming remains fixed, is called shifting. The purpose here is to change the top dead center in the final motion profile of the ram, thereby balancing the torques in the rise and fall zones. Maximum torque value is minimized according to the shifting value determined by the controller. This calculation is made considering the limits given depending on the servo motor characteristics, changing the shifting angle and using multi-objective genetic algorithm, and the ideal one will be selected among the possible solutions.
- NSGA-II Pareto-optimal set comprised of solutions that do not suppress each other to be able to observe the changes between the objectives and offer alternatives for evaluating different situations in multi-objective problems.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Presses (AREA)
Abstract
The present invention relates to a press control method, preferably for more efficient operation of the servo hybrid mechanical press, comprising the process steps of resetting the pressure of the pneumatic cylinder, torque measurement module making torque measurement through the crank link of the servo motor at certain points, calculating module calculating the die weight according to the torque values, recording information such as values of links of the servo hybrid mechanical press, servo motor torque and speed, product length limit, etc. into a database, product length measurement module determining the length of the product by means of dynamic calculation at the point at which the torque of the servo motor increases during the learning strokes, controller determining at least one control point according to the stroke, product length, upper dwell values, the controller calculating the value of shifting the servo motor motion profile so as to provide maximum spm (strokes per minute) or minimum torque according to the information received from the torque measurement module, calculation module, product length measurement module.
Description
A PRESS CONTROL METHOD Field of the Invention
The present invention relates to a press control method for increasing the performance of a mechanical press with a hybrid mechanism used in processes such as forming, bending, punching, cutting, and drawing.
Background of the Invention
Presses, which are among the primary industrial machines today, are generally examined in two main groups. These are hydraulic presses and mechanical presses. Mechanical presses operate with the principle of transferring the kinetic energy accumulated by means of rotation of the flywheel onto the ram as force by a mechanism. Today, servo motor replaces the flywheel, and such presses are called servo motor controlled presses (servo press). In the state of the art, servo motor curves are not distributed equally on the operating area. It reaches excessive torque/speed in one area, while torque/speed values remain low in another area. Therefore, the press cannot be accelerated as much as required. Since there is no die weight recognition and load entry point detection method in the press control methods used in the state of the art, the operation of the press is left to the operator's knowledge.
Patent application no 2011/09163, known in the state of the art, discloses a servo mechanical press system with a hybrid mechanism. The press system comprises a frame, at least one cavity inside the frame, at least one flywheel which provides
the mechanical energy required for the system, at least one motor which enables the flywheel to rotate, at least one upper mechanism which operates with the mechanical energy stored by the flywheel, at least one servo motor which converts the electric energy into mechanical energy, at least one lower mechanism which operates with the mechanical energy generated by the servo motor. The energy used in the invention of the application cannot be evenly distributed within the mechanism, and more energy is used in the press system and it not achieved sufficient performance. For this reason, the production rate decreases.
The Problems Solved with the Invention
The objective of the present invention is to provide a press control method for the press with hybrid mechanism to use the energy more efficiently.
The objective of the present invention is to provide a press control method for a press system which increases production rate in dies used for processes such as forming, bending, punching, cutting, and drawing.
Detailed Description of the Invention
A press control method preferably for more efficient operation of the servo mechanical press comprises the steps of - resetting the pressure of the pneumatic cylinders, torque measurement module making torque measurement through the crank link of the servo motor at certain points, calculating module calculating the die weight according to the torque values, calculating module calculating and applying the suitable pneumatic pressure according to the calculated die weight,
recording information such as values of links of the servo hybrid mechanical press, servo motor torque and speed, product length limit, etc. into a database, product length measurement module determining the height of the product by means of dynamic calculation at the point at which the torque of the servo motor increases during the learning strokes, controller determining at least one control point according to the stroke, product length, upper dwell values, the controller calculating the value of shifting the servo motor motion profile so as to provide maximum spm (strokes per minute) or minimum torque according to the information received from the torque measurement module, calculation module, product length measurement module.
The smart press control method of the present invention relates to a control method which enables to increase the performance of the servo hybrid mechanical press. The servo-mechanical press system with hybrid mechanism comprises a flywheel, a motor which enables the flywheel to be rotated and which is connected to the flywheel, an upper mechanism which operates with the mechanical energy generated by the flywheel, a servo motor which converts the electric energy into mechanical energy, and a lower mechanism which operates with the mechanical energy generated by the servo motor.
In the control method, first it is required to determine the die weight of the press. Pneumatic balancing cylinder pressures are reset or fixed at a determined level. The torque measurement module performs torque measurement at certain angles of the crank link of the servo motor. Then, the calculation module calculates the die weight from the kinetostatic. In this calculation, mass will be determined by comparing the force analysis performed with the ram without die in the static condition and the force analysis results in the state with the die.
The link values of the servo hybrid mechanical press, inertial values, pneumatic cylinder diameter, expansion tank volumes, maximum product length, maximum
and minimum stroke height, servo motor torque and speed value, maximum torque and speed of constant velocity motor of flywheel, transfer ratio of the servo motor, reference force value of the servo motor are recorded in the database.
In order to determine the length of the product, the motion profile relative to the maximum part length will be determined and the first stroke will be made. The product length measurement module determines the height of the product by comparing the torque value corresponding to the specific height in the servo torque value motion profile with the Tref value. If the torque value corresponding to the specific height in the servo torque value motion profile is lower than the Tref value, the height value will be decreased and the most suitable height value will be determined by continuing the trials until the Tref value is achieved.
The controller determines more than one control point on the movement axis after determining the stroke height, product length, and upper dwell values.
The controller calculates the maximum spm with optimum shifting value to minimize the maximum torque value or maximizes upper dwell value. Offsetting fall and rise zones to the right or left along the master axis, provided that the profile of the motion profile during forming remains fixed, is called shifting. The purpose here is to change the top dead center in the final motion profile of the ram, thereby balancing the torques in the rise and fall zones. Maximum torque value is minimized according to the shifting value determined by the controller. This calculation is made considering the limits given depending on the servo motor characteristics, changing the shifting angle and using multi-objective genetic algorithm, and the ideal one will be selected among the possible solutions.
An example of the genetic algorithm method used here is the NSGA-II algorithm, which creates a Pareto-optimal set comprised of solutions that do not suppress each other to be able to observe the changes between the objectives and offer alternatives for evaluating different situations in multi-objective problems.
Claims
1. A press control method, preferably for more efficient operation of the servo mechanical press, comprising the steps of resetting the pressure of the pneumatic cylinder, torque measurement module making torque measurement through the crank link of the servo motor at certain points, calculating module calculating the die weight according to the torque values, calculating module calculating and applying the suitable pneumatic pressure according to the calculated die weight, recording information such as values of links of the servo hybrid mechanical press, servo motor torque and speed, product length limit, etc. into a database, product length measurement module determining the length of the product by means of dynamic calculation at the point at which the torque of the servo motor increases during the learning strokes, controller determining at least one control point according to the stroke, product length, upper dwell values, the controller calculating the value of shifting the servo motor motion profile so as to provide maximum spm (strokes per minute) or minimum torque according to the information received from the torque measurement module, calculation module, product length measurement module.
2. A press control method according to claim 1, characterized by the step of continuously regulating the shifting value of the press in the continuous operating mode according to the information coming from the torque measurement module, calculation module, product length measurement module , by means of applying the shifting value calculated by the controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202180098981.6A CN117480048A (en) | 2021-04-06 | 2021-07-09 | Control method of press |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TR2021/006155 | 2021-04-06 | ||
| TR202106155 | 2021-04-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2022216246A1 true WO2022216246A1 (en) | 2022-10-13 |
Family
ID=83545636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/TR2021/050711 WO2022216246A1 (en) | 2021-04-06 | 2021-07-09 | A press control method |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2022216246A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6337042B1 (en) * | 1999-04-20 | 2002-01-08 | Mitsubishi Denki Kabushiki Kaisha | Press machine and method of manufacturing pressed products |
| US20100170405A1 (en) * | 2006-04-06 | 2010-07-08 | Ihi Corporation | Press machine, control apparatus and control method of press machine |
| US20120111207A1 (en) * | 2010-11-09 | 2012-05-10 | Aida Engineering, Ltd. | Control device of servo press and method for controlling servo press |
-
2021
- 2021-07-09 WO PCT/TR2021/050711 patent/WO2022216246A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6337042B1 (en) * | 1999-04-20 | 2002-01-08 | Mitsubishi Denki Kabushiki Kaisha | Press machine and method of manufacturing pressed products |
| US20100170405A1 (en) * | 2006-04-06 | 2010-07-08 | Ihi Corporation | Press machine, control apparatus and control method of press machine |
| US20120111207A1 (en) * | 2010-11-09 | 2012-05-10 | Aida Engineering, Ltd. | Control device of servo press and method for controlling servo press |
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