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An online control method and control system for the pressing process of a forging press

A technology of pressing process and control method, which is applied to the driving device of forging presses, etc., can solve problems such as uncontrollable system stability, and achieve the effect of ensuring system stability and improving efficiency

Active Publication Date: 2022-04-01
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] To this end, it is necessary to provide an online control method that combines data and models suitable for high-precision forging machines, to solve the problem that traditional methods cannot control the stability of the system during the learning process, to improve the learning efficiency of online reinforcement learning, and to reduce the computational complexity. quantity

Method used

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  • An online control method and control system for the pressing process of a forging press
  • An online control method and control system for the pressing process of a forging press
  • An online control method and control system for the pressing process of a forging press

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0111] Example 1: Low constant speed state

[0112] The slider is set to 0.03mm / s, and since the pressure is very slow, the water consumption of the oil in the hydraulic cylinder is small, and the proportional servo valve has a large variable diameter loss pressure due to the small opening degree. Therefore, the opening degree of the proportional servo valve is a hydraulic cylinder working pressure and a circulation flowing through the servo valve pressure loss. Since the contraindication search is a random search, a certain random search is shown, this embodiment has tested 5 times for the lower pressure process. Figure 2A Is a speed diagram, Figure 2B It is a schematic diagram of the output of the controller, and the different colors represent each test.

[0113] From Figure 2B It can be seen that each curve is not fully covered, which reflects that each control value is not completely consistent with the method of the present invention. Figure 2A These control values ​​are re...

Embodiment 2

[0115] Example 2: Variable Speed ​​State

[0116] The speed is set to 0.08mm / s from the beginning, after 0.04mm / s, the final output 0.06mm / s, the process description, as shown in the formula (17)

[0117]

[0118] This embodiment repeats the application effect of 5 times to test the recommended method. Figure 3A It is a schematic diagram of the pressing process in the shift state; Figure 3b It is a schematic diagram of the output of the controller.

[0119] From Figure 3A It can be seen that each curve can track the speed of setting up in different speed changes, at 1-30 speed set value of 0.08, the maximum peak 0.0812 occurs in the 5th, minimum 0.0788; at 50 The speed set value of 0.04, the maximum peak 0.0406 occurs in the 3rd, minimum 0.0394, occurs in the first, 2, 3, 4 times; at 80-100 period speed setpoint is 0.06, the maximum peak value The minimum peak is 0.0609 and 0.0394, respectively, and the relative error is 1.5%. The mean and residuals of each time are shown ...

Embodiment 3

[0122] Example 3: Effect of sampling cycle

[0123] This embodiment tested the impact of the method recommended by the method of different sampling cycle. The sampling cycle is selected for 1-5 minutes, and the reference speed is selected from 0.04mm / s, the result is as Figure 4A and 4b Indicated. When the controller starts at the beginning, the automatic control is performed in the online control method according to the present invention. Figure 4A The curve in the middle represents the slider under different sampling cycles, Figure 4b Reflects the output of the controller under different sampling cycles. As can be seen from the figure, the different sampling cycles have a large influence, the sampling cycle is short, the duration of the transient process is short; the sampling cycle is long, the transition time is longer. The main reason is that the control amount obtained by the recommended method is constant in a sampling cycle. When the sampling period is short, it can adap...

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Abstract

The invention discloses an online control method and a control system for the pressing process of a forging press. The control method includes: obtaining the state information of the sampling point at the first moment, randomly selecting the opening control amount of the regulating mechanism, obtaining the state information of the sampling point at the second moment, and calculating the absolute value of the actual speed and the set speed at the two moments The difference between the instantaneous reward value is obtained; the overall value of the suppression process is estimated to obtain the time series error of the two moments; the relationship between the control amount and the state variable of the suppression process is derived, and the taboo algorithm is used to obtain the optimal opening of the regulating mechanism in the current state value, which further causes the piston to change; return to step 3 and repeat the execution to converge until the value of the opening control amount of the regulating mechanism no longer changes. The invention realizes the on-line control of the forging press by adopting the combination of reinforcement learning and taboo search, reduces the dependence on the accuracy of the model, and improves the work efficiency at the same time.

Description

Technical field [0001] The present invention belongs to the online control of the forging machine, and in particular to an online control method suitable for use in a high precision forging machine pressing process. Background technique [0002] The existing forging hydraulic press adopts a high-precision control method such as sliding mode control, adaptive control, can achieve difficult for fori quality control, thereby reducing the difficulty of processing processes. However, its control effect is greatly affected by the accuracy of the model, and as the extension of the model use period will have a model inaccurate, this will lead to the ability to control the function, how to find an automatic and environmental change The matching control method is an urgent problem to be solved. [0003] Although existing data acquisition systems and smart sensor technologies can be more convenient to obtain the forging data of the forging machine, because the high-precision forging machine...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J9/20
CPCB21J9/20
Inventor 张大鹏高志伟
Owner TIANJIN UNIV
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