Vacuum isothermal forging hydraulic machine hydraulic sliding block speed control system and method

Abstract

The invention discloses a speed control system and method for a hydraulic sliding block of a vacuum isothermal forging hydraulic machine, and the system comprises a management terminal, a detection system and a control system, the management terminal is in bidirectional connection with the detection system, and the detection system is in bidirectional connection with the control system. The detection system comprises a detection module, a data acquisition module, a data processing module and a data sending module, and the output end of the detection module is connected with the input end of the data acquisition module. According to the speed control system and method for the hydraulic sliding block of the vacuum isothermal forging hydraulic machine, high-precision control over the speed of the sliding block is achieved through the high-precision displacement sensor and an improved PID control algorithm, the speed control precision can reach + / -0.1 mm / s, speed fluctuation is effectively reduced, the forging quality is improved, and when materials with extremely high speed precision requirements are forged, the speed control precision is greatly improved. Uniform internal structure of the forge piece can be ensured, defects are reduced, and the product percent of pass is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of forging, and particularly to a hydraulic slider speed control system and method for a vacuum isothermal forging hydraulic press. Background Technique

[0002] Vacuum isothermal forging is a process in which a blank is heated above the recrystallization temperature in a vacuum environment and plastically processed at a slow deformation speed. This process can obtain forgings with uniform structure, fine grains, and excellent mechanical properties, and is particularly suitable for the forming of difficult-to-deform materials.

[0003] During the vacuum isothermal forging process, the speed control accuracy of the hydraulic press slider directly affects the quality and production efficiency of the forgings. The existing slider speed control systems usually adopt open-loop control or simple closed-loop control, which are difficult to achieve high-precision speed control and are prone to problems such as speed fluctuations and response lags, resulting in unstable dimensional accuracy and poor surface quality of the forgings. Therefore, the present invention provides a hydraulic slider speed control system and method for a vacuum isothermal forging hydraulic press. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a hydraulic slider speed control system and method for a vacuum isothermal forging hydraulic press, which solves the problems that the existing slider speed control systems usually adopt open-loop control or simple closed-loop control, are difficult to achieve high-precision speed control, are prone to problems such as speed fluctuations and response lags, and thus lead to unstable dimensional accuracy and poor surface quality of the forgings.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A hydraulic slider speed control system for a vacuum isothermal forging hydraulic press includes a management terminal, a detection system, and a control system. The management terminal is bidirectionally connected to the detection system, and the detection system is bidirectionally connected to the control system. The detection system includes a detection module, a data acquisition module, a data processing module, and a data sending module. The output end of the detection module is connected to the input end of the data acquisition module, the output end of the data acquisition module is connected to the input end of the data processing module, and the output end of the data processing module is connected to the input end of the data sending module;

[0006] The detection module includes a pressure detection unit, a displacement detection unit, and an oil temperature detection unit.

[0007] Preferably, the data processing module includes a data filtering unit and a data differentiation unit.

[0008] Preferably, the control system includes a data receiving module, a data comparison module, a PID control algorithm module, a data generation module, a data transmission module, and a driving module. The output end of the data receiving module is connected to the input end of the data comparison module, and the output end of the data comparison module is connected to the input end of the PID control algorithm module.

[0009] Preferably, the output end of the PID control algorithm module is connected to the input end of the data generation module, the output end of the data generation module is connected to the input end of the data transmission module, and the output end of the data transmission module is connected to the input end of the driving module.

[0010] Preferably, the driving module includes a flow control unit, a hydraulic power unit, and a vacuum control unit.

[0011] Preferably, the management terminal includes a system parameter setting module, an operation status display module, and a fault diagnosis module.

[0012] Preferably, the operation status display module includes a data collection unit, a data conversion unit, a data modeling unit, a data imaging unit, and a data display unit. The output end of the data collection unit is connected to the input end of the data conversion unit, the output end of the data conversion unit is connected to the input end of the data modeling unit, the output end of the data modeling unit is connected to the input end of the data imaging unit, and the output end of the data imaging unit is connected to the input end of the data display unit.

[0013] The present invention also discloses a method for controlling the speed of a hydraulic slider of a vacuum isothermal forging hydraulic press, which specifically includes the following steps:

[0014] S1. Displacement detection: Use a high-precision displacement sensor to detect the real-time displacement of the hydraulic press slider, and collect and transmit the displacement data information to the data processing module through the data acquisition module;

[0015] S2. Data processing: Filter the displacement data information through the data processing module to remove noise and interference in the displacement data information, and perform differential processing on the filtered displacement data information to calculate the real-time speed of the slider, and send the real-time speed data to the control system;

[0016] S3. Speed comparison and control algorithm calculation: The control system compares the set speed value and the real-time speed data received, calculates the deviation between the two, and uses an improved PID control algorithm to calculate and generate a control signal according to the speed deviation, and transmits the control signal to the driving module through the data transmission module;

[0017] S4. Drive control: After receiving the control signal, the drive module controls the opening degree of the electro-hydraulic servo valve, adjusts the oil flow rate and pressure entering the hydraulic cylinder, and thus controls the speed of the slider.

[0018] S5. Vacuum control: The vacuum control unit is used to maintain the vacuum degree in the forging chamber to ensure that the forging process is carried out in a vacuum environment.

[0019] S6. Parameter setting and monitoring: System parameters are set through the system parameter setting module, and the operating status of the system is monitored in real time through the operating status display module.

[0020] Beneficial effects

[0021] The present invention provides a hydraulic slider speed control system and method for a vacuum isothermal forging hydraulic press. Compared with the prior art, it has the following beneficial effects:

[0022] 1. The hydraulic slider speed control system and method for the vacuum isothermal forging hydraulic press achieve high-precision control of the slider speed through a high-precision displacement sensor and an improved PID control algorithm. The speed control accuracy can reach ±0.1 mm / s, effectively reducing speed fluctuations, improving the quality of forgings. When forging materials with extremely high requirements for speed accuracy, it can ensure uniform internal structure of forgings, reduce the generation of defects, and improve the product qualification rate.

[0023] 2. The hydraulic slider speed control system and method for the vacuum isothermal forging hydraulic press can effectively suppress various interferences through the improved PID control algorithm, ensure the stability of speed, with small speed fluctuations, and improve the response speed of the system through the differential preview strategy, ensuring that the slider can quickly respond to speed commands. The parameter self-adaptive adjustment strategy enables the system to adapt to different loads and working conditions, optimizing the control performance.

[0024] 3. The hydraulic slider speed control system and method for the vacuum isothermal forging hydraulic press are provided with a management terminal. Using the system parameter setting module makes the operation simpler and more convenient, and using the operating status display module enables users to more intuitively monitor the operating status of the system. Description of the drawings

[0025] Figure 1 It is the general principle block diagram of the present invention;

[0026] Figure 2 It is the principle block diagram of the management terminal of the present invention;

[0027] Figure 3 It is the principle block diagram of the operating status display module of the present invention;

[0028] Figure 4 It is the principle block diagram of the detection system of the present invention;

[0029] Figure 5 This is the principle block diagram of the control system of the present invention.

[0030] In the figure: 1 - management terminal, 11 - system parameter setting module, 12 - operating status display module, 121 - data collection unit, 122 - data conversion unit, 123 - data modeling unit, 124 - data imaging unit, 125 - data display unit, 13 - fault diagnosis module, 2 - detection system, 21 - detection module, 211 - pressure detection unit, 212 - displacement detection unit, 213 - oil temperature detection unit, 22 - data acquisition module, 23 - data processing module, 231 - data filtering unit, 232 - data differentiation unit, 24 - data sending module, 3 - control system, 31 - data receiving module, 32 - data comparison module, 33 - PID control algorithm module, 34 - data generation module, 35 - data transmission module, 36 - drive module, 361 - flow control unit, 362 - hydraulic power unit, 363 - vacuum control unit. Specific implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] Please refer to Figures 1-5 , the present invention provides a technical solution:

[0033] A hydraulic slider speed control system for a vacuum isothermal forging hydraulic press, including a management terminal 1, a detection system 2 and a control system 3. The management terminal 1 is bidirectionally connected to the detection system 2, and the detection system 2 is bidirectionally connected to the control system 3. The detection system 2 includes a detection module 21, a data acquisition module 22, a data processing module 23 and a data sending module 24. The output end of the detection module 21 is connected to the input end of the data acquisition module 22, the output end of the data acquisition module 22 is connected to the input end of the data processing module 23, and the output end of the data processing module 23 is connected to the input end of the data sending module 24;

[0034] The detection module 21 includes a pressure detection unit 211, a displacement detection unit 212 and an oil temperature detection unit 213.

[0035] In the embodiment of the present invention, the data processing module 23 includes a data filtering unit 231 and a data differentiation unit 232.

[0036] In an embodiment of the present invention, the control system 3 includes a data receiving module 31, a data comparison module 32, a PID control algorithm module 33, a data generation module 34, a data transmission module 35, and a drive module 36. The output end of the data receiving module 31 is connected to the input end of the data comparison module 32, and the output end of the data comparison module 32 is connected to the input end of the PID control algorithm module 33.

[0037] In an embodiment of the present invention, the output end of the PID control algorithm module 33 is connected to the input end of the data generation module 34, the output end of the data generation module 34 is connected to the input end of the data transmission module 35, and the output end of the data transmission module 35 is connected to the input end of the drive module 36.

[0038] In an embodiment of the present invention, the drive module 36 includes a flow control unit 361, a hydraulic power unit 362, and a vacuum control unit 363.

[0039] In an embodiment of the present invention, the management terminal 1 includes a system parameter setting module 11, an operating state display module 12, and a fault diagnosis module 13.

[0040] In an embodiment of the present invention, the operating state display module 12 includes a data collection unit 121, a data conversion unit 122, a data modeling unit 123, a data imaging unit 124, and a data display unit 125. The output end of the data collection unit 121 is connected to the input end of the data conversion unit 122, the output end of the data conversion unit 122 is connected to the input end of the data modeling unit 123, the output end of the data modeling unit 123 is connected to the input end of the data imaging unit 124, and the output end of the data imaging unit 124 is connected to the input end of the data display unit 125.

[0041] The present invention also discloses a method for controlling the speed of a hydraulic slider of a vacuum isothermal forging hydraulic press, which specifically includes the following steps:

[0042] S1. Displacement detection: Use a high-precision displacement sensor to detect the real-time displacement of the hydraulic press slider, and collect and transmit the displacement data information to the data processing module 23 through the data acquisition module 22;

[0043] The high-precision displacement sensor uses a high-precision grating scale to detect the displacement of the slider in real time. The measurement accuracy of the grating scale can reach the micron level, meeting the requirements of the system for high-precision measurement.

[0044] S2. Data processing: Filter the displacement data information through the data processing module 23 to remove the noise and interference in the displacement data information, perform differential processing on the filtered displacement data information, calculate the real-time speed of the slider, and send the real-time speed data to the control system 3;

[0045] Filtering mainly uses a filter to process the input signal. Through specific algorithms or mathematical models, unwanted components in the signal such as noise are removed or weakened, while the useful signal of interest is retained.

[0046] S3. Speed comparison and control algorithm calculation: The control system 3 compares the set speed value with the real-time speed data it receives, calculates the deviation between the two, and uses an improved PID control algorithm to calculate and generate a control signal based on the speed deviation, and transmits the control signal to the drive module 36 through the data transmission module 35;

[0047] The three parameters (K_p), (K_i), (K_d) of the PID control algorithm are reasonably set according to the system's dynamic characteristics and performance requirements. To further improve the control performance, the following improvement measures are adopted in this embodiment:

[0048] Anti-integral saturation strategy: When the speed deviation is large, the accumulation of the integral term may cause the control output to exceed the reasonable range, resulting in integral saturation. To avoid this problem, the accumulation of the integral term is restricted in this embodiment. When the accumulation of the integral term reaches a certain threshold, the accumulation of the integral term is stopped until the speed deviation decreases to a certain extent and then the integration continues.

[0049] Differential preview strategy: The differential link is applied to the feedback signal, that is, the speed signal, rather than the deviation signal. This can avoid excessive response to sudden changes in the set speed, improve the anti-interference ability of the system, and at the same time can predict the change trend of the speed in advance and accelerate the response speed of the system.

[0050] Parameter adaptive adjustment strategy: According to the system operation state and load changes, the PID parameters are adjusted online. For example, in the system startup stage, the value of (K_p) can be appropriately increased to accelerate the response speed; in the steady-state operation stage, the value of (K_p) can be appropriately decreased to improve the stability of the system.

[0051] The control algorithm is an improved PID control algorithm. The improved PID control algorithm includes:

[0052] Anti-integral saturation strategy: When the speed deviation is large, restrict the accumulation of the integral term to prevent the occurrence of integral saturation;

[0053] Differential preview strategy: Apply the differential link to the feedback signal to improve the response speed and anti-interference ability of the system;

[0054] Parameter adaptive adjustment strategy: According to the system operation state and load changes, adjust the PID parameters online to optimize the control performance.

[0055] S4. Drive Control: After receiving the control signal, the drive module 36 controls the opening degree of the electro-hydraulic servo valve, adjusts the oil flow rate and pressure entering the hydraulic cylinder, and thus controls the speed of the slider.

[0056] The hydraulic power unit 362 includes a hydraulic pump, a hydraulic cylinder, an oil tank, a filter, a cooler, and a heater, and is used to provide power for the movement of the slider and maintain the cleanliness and temperature stability of the oil.

[0057] S5. Vacuum Control: The vacuum control unit 363 maintains the vacuum degree of the forging chamber to ensure that the forging process is carried out in a vacuum environment.

[0058] The vacuum control unit 363 mainly includes a vacuum pump, a vacuum needle, and a vacuum valve, and is used to maintain the vacuum environment of the forging chamber.

[0059] S6. Parameter Setting and Monitoring: The system parameters are set through the system parameter setting module 11, and the operating status of the system is monitored in real time through the operating status display module 12.

[0060] Through a high-precision displacement sensor and an improved PID control algorithm, high-precision control of the slider speed is achieved. The speed control accuracy can reach ±0.1 mm / s, effectively reducing speed fluctuations, improving the quality of forgings. When forging materials with extremely high requirements for speed accuracy, it can ensure uniform internal structure of forgings, reduce defect generation, and improve the product qualification rate.

[0061] The improved PID control algorithm can effectively suppress various interferences, ensure the stability of the speed, with small speed fluctuations, and improve the response speed of the system through the differential preview strategy, ensuring that the slider can quickly respond to speed commands. The parameter adaptive adjustment strategy enables the system to adapt to different loads and working conditions and optimize the control performance.

[0062] By setting up the management terminal 1, the operation is made more simple and convenient by using the system parameter setting module 11, and the user can more intuitively monitor the operating status of the system by using the operating status display module 12.

[0063] Meanwhile, the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0064] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0065] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic slider speed control system for a vacuum isothermal forging hydraulic press, comprising a management terminal (1), a detection system (2) and a control system (3). The management terminal (1) is bidirectionally connected to the detection system (2), and the detection system (2) is bidirectionally connected to the control system (3), characterized in that: The detection system (2) includes a detection module (21), a data acquisition module (22), a data processing module (23), and a data sending module (24). The output end of the detection module (21) is connected to the input end of the data acquisition module (22), the output end of the data acquisition module (22) is connected to the input end of the data processing module (23), and the output end of the data processing module (23) is connected to the input end of the data sending module (24); The detection module (21) includes a pressure detection unit (211), a displacement detection unit (212), and an oil temperature detection unit (213).

2. The hydraulic slider speed control system of a vacuum isothermal forging hydraulic press according to claim 1, wherein: The data processing module (23) includes a data filtering unit (231) and a data differentiation unit (232).

3. A hydraulic slider speed control system for a vacuum isothermal forging hydraulic press according to claim 1, characterized in that: The control system (3) includes a data receiving module (31), a data comparison module (32), a PID control algorithm module (33), a data generation module (34), a data transmission module (35), and a driving module (36). The output end of the data receiving module (31) is connected to the input end of the data comparison module (32), and the output end of the data comparison module (32) is connected to the input end of the PID control algorithm module (33).

4. A hydraulic slider speed control system for a vacuum isothermal forging hydraulic press according to claim 3, characterized in that: The output end of the PID control algorithm module (33) is connected to the input end of the data generation module (34), the output end of the data generation module (34) is connected to the input end of the data transmission module (35), and the output end of the data transmission module (35) is connected to the input end of the driving module (36).

5. A hydraulic slider speed control system for a vacuum isothermal forging hydraulic press according to claim 3, characterized in that: The driving module (36) includes a flow control unit (361), a hydraulic power unit (362), and a vacuum control unit (363).

6. A hydraulic slider speed control system for a vacuum isothermal forging hydraulic press according to claim 1, characterized in that: The management terminal (1) includes a system parameter setting module (11), an operating state display module (12), and a fault diagnosis module (13).

7. A hydraulic slider speed control system for a vacuum isothermal forging hydraulic press according to claim 6, characterized in that: The operating state display module (12) includes a data collection unit (121), a data conversion unit (122), a data modeling unit (123), a data imaging unit (124), and a data display unit (125). The output end of the data collection unit (121) is connected to the input end of the data conversion unit (122), the output end of the data conversion unit (122) is connected to the input end of the data modeling unit (123), the output end of the data modeling unit (123) is connected to the input end of the data imaging unit (124), and the output end of the data imaging unit (124) is connected to the input end of the data display unit (125).

8. Implementing a method for controlling the speed of a hydraulic slider of a vacuum isothermal forging hydraulic press as claimed in claims 1-7, specifically including the following steps: S1. Displacement detection: Using a high-precision displacement sensor to detect the real-time displacement of the hydraulic press slider, collecting the displacement data information through the data acquisition module (22) and transmitting it to the data processing module (23); S2. Data processing: The displacement data information is filtered by the data processing module (23) to remove noise and interference in the displacement data information, and the filtered displacement data information is differentiated to calculate the real-time speed of the slider, and the real-time speed data is sent to the control system (3); S3. Speed comparison and control algorithm calculation: The control system (3) compares the received set speed value with the real-time speed data, calculates the deviation between the two, and uses an improved PID control algorithm to calculate and generate a control signal according to the speed deviation, and the control signal is sent to the drive module (36) through the data transmission module (35); S4. Drive control: After receiving the control signal, the drive module (36) controls the opening of the electro-hydraulic servo valve to adjust the oil flow and pressure entering the hydraulic cylinder, thereby controlling the speed of the slider; S5. Vacuum control: The vacuum control unit (363) is used to maintain the vacuum degree of the forging chamber to ensure that the forging process is carried out in a vacuum environment; S6. Parameter setting and monitoring: System parameters are set through the system parameter setting module (11), and the operating state of the system is monitored in real time through the operating state display module (12).

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