Synchronous floating hydraulic control system for upper and lower ejection cylinders of a forging hydraulic press

Abstract

This invention relates to the field of hydraulic press technology, and more particularly to a synchronous floating hydraulic control system for the upper and lower ejector cylinders of a forging hydraulic press. The system includes an upper control unit connected to the upper ejector cylinder, a lower control unit connected to the lower ejector cylinder, and a programmable logic controller (PLC). The PLC controls the lower control unit to lift the lower piston of the lower ejector cylinder upwards, allowing a loading robot to place the billet on top of the lower piston. The PLC then regulates the upper control unit according to a clamping force balance formula to extend the upper piston of the upper ejector cylinder downwards, clamping the billet between the upper and lower pistons. The PLC regulates the upper and lower control units through the ejection force balance formula to control the synchronous movement of the upper and lower pistons, thus completing the automatic billet loading process. This invention improves the automation control effect of the upper and lower ejector cylinders of the forging hydraulic press and increases the automatic billet loading rate.

Description

Technical Field

[0001] This invention relates to the field of hydraulic press technology, and in particular to a synchronous floating hydraulic control system for the upper and lower ejector cylinders of a forging hydraulic press. Background Technology

[0002] With the rapid development of hydraulic press technology, isothermal forging hydraulic presses are moving towards automation and unmanned operation. Traditional hydraulic control systems for the upper and lower ejector cylinders of isothermal forging hydraulic presses are gradually revealing their limitations when facing the demands of modern production, as they cannot achieve automated adjustment and intelligent collaborative operation. Specifically, traditional systems, limited by their mechanical structure and fixed logic control modes, have significant shortcomings in the following aspects:

[0003] Lack of adaptive adjustment capability: Traditional systems rely on manually preset parameters (such as ejection pressure and speed threshold). When the material and size of the forged workpiece change, they cannot automatically adjust the hydraulic output of the ejector cylinder according to the real-time working conditions. For example, in the isothermal forging process of titanium alloy, when the material flow stress changes with temperature fluctuations, traditional systems have difficulty dynamically matching the ejection force, which may lead to forging demolding deformation or overload of the ejection mechanism.

[0004] Insufficient precision in multi-cylinder coordinated control: When the upper and lower ejector cylinders eject synchronously or in steps, traditional hydraulic systems rely solely on mechanical synchronization or simple pressure closed-loop control, making it difficult to achieve micron-level displacement synchronization precision. In the production of precision forgings (such as aero-engine blades), this error may lead to uneven mold wear or excessive flash on the forgings, affecting the product qualification rate.

[0005] Weak fault warning and self-healing capabilities: The system lacks a sensor network and data analysis module, making it unable to monitor key parameters such as hydraulic oil contamination and cylinder displacement deviation in real time. When faults such as oil circuit leakage or proportional valve sticking occur, they often require manual inspection, leading to increased downtime and maintenance costs, and failing to meet the "predictive maintenance" requirements of unmanned production lines. Summary of the Invention

[0006] The present invention aims to at least solve one of the technical problems existing in the related art. To this end, the present invention provides a synchronous floating hydraulic control system for the upper and lower ejector cylinders of a forging hydraulic press, which solves the technical problems of difficult adaptive adjustment and poor coordination in the prior art, improves the coordinated adjustment capability of the upper and lower ejector cylinders, improves the automation control effect of the upper and lower ejector cylinders of the forging hydraulic press, and increases the automatic feeding rate of billets.

[0007] This invention provides a synchronous floating hydraulic control system for the upper and lower ejector cylinders of a forging hydraulic press, including an upper control unit connected to the upper ejector cylinder, a lower control unit connected to the lower ejector cylinder, and a programmable controller connected to the upper control unit and the lower control unit. The upper control unit and the lower control unit are connected to an oil tank.

[0008] The programmable controller controls the lower control unit to control the lower plunger of the lower ejector cylinder to push upward, so that the loading robot places the billet on top of the lower plunger. Then, the programmable controller adjusts the upper control unit according to the clamping force balance formula to control the upper plunger of the upper ejector cylinder to extend downward, so that the billet is clamped between the upper plunger and the lower plunger.

[0009] The clamping force balance formula is: ,

[0010] in, This indicates the clamping force of the upper ejector cylinder. This indicates the working pressure of the upper cylinder. This indicates the effective area of ​​the upper plunger. This represents the weight of the billet. This represents the frictional force at the clamping contact surfaces of the upper and lower pistons.

[0011] A further improvement of the synchronous floating hydraulic control system for the upper and lower ejector cylinders of a forging hydraulic press of the present invention is that the upper control unit includes a first proportional pump source, a first proportional servo valve, a first upper proportional pressure valve, a second upper proportional pressure valve, a first upper pressure sensor, a second upper pressure sensor, a third upper pressure sensor, and an upper displacement sensor.

[0012] The first proportional pump source is connected to the oil tank. The first proportional pump source is provided with a first oil outlet. The first proportional servo valve is connected to the first oil outlet. The first proportional servo valve has a first valve oil outlet and a second valve oil outlet. The first valve oil outlet and the first upper interface of the upper ejector cylinder are connected through a first oil circuit pipe. The second valve oil outlet and the second upper interface of the upper ejector cylinder are connected through a second oil circuit pipe.

[0013] The first upper proportional pressure valve is connected to the oil tank and the first oil circuit pipeline, and the second upper proportional pressure valve is connected to the oil tank and the second oil circuit pipeline.

[0014] The first upper pressure sensor is disposed between the first proportional servo valve and the first proportional pump source, the second upper pressure sensor is disposed in the first oil circuit pipeline, the third upper pressure sensor is disposed in the second oil circuit pipeline, and the upper displacement sensor is connected to the upper ejector cylinder.

[0015] A further improvement of the synchronous floating hydraulic control system for the upper and lower ejector cylinders of a forging hydraulic press of the present invention is that the programmable controller regulates the upper control unit and the lower control unit through the ejector force balance formula to control the upper piston and the lower piston to move synchronously, so as to complete the automatic feeding of the billet.

[0016] The formula for balancing the top output force is: ,

[0017] in, This indicates the pressure of the first proportional pressure valve on the upper ejector cylinder. This indicates the pressure of the second proportional pressure valve on the upper ejector cylinder. This represents the sum of the weight of the billet, the weight of the upper piston, and the frictional force between the upper and lower pistons.

[0018] A further improvement of the synchronous floating hydraulic control system for the upper and lower ejector cylinders of a forging hydraulic press of the present invention is that the lower control unit includes a second proportional pump source, a second proportional servo valve, a first lower proportional pressure valve, a second lower proportional pressure valve, a first lower pressure sensor, a second lower pressure sensor, a third lower pressure sensor, and a lower displacement sensor.

[0019] The second proportional pump source is connected to the oil tank. The second proportional pump source is provided with a second oil outlet. The second proportional servo valve is connected to the second oil outlet. The second proportional servo valve has a third valve outlet and a fourth valve outlet. The third valve outlet and the first lower interface of the lower ejector cylinder are connected through a third oil circuit pipe. The fourth valve outlet and the second lower interface of the lower ejector cylinder are connected through a fourth oil circuit pipe.

[0020] The first lower proportional pressure valve is connected to the oil tank and the third oil circuit pipeline, and the second lower proportional pressure valve is connected to the oil tank and the fourth oil circuit pipeline;

[0021] The first downward pressure sensor is disposed between the second proportional servo valve and the second proportional pump source, the second downward pressure sensor is disposed in the third oil circuit pipeline, the third downward pressure sensor is disposed in the fourth oil circuit pipeline, and the downward displacement sensor is connected to the downward ejector cylinder.

[0022] A further improvement of the synchronous floating hydraulic control system for the upper and lower ejector cylinders of a forging hydraulic press of the present invention is that the programmable controller is provided with a speed control formula.

[0023] The speed control formula is:

[0024] in, This indicates the speed difference between the upper and lower cylinder ejection points. This indicates the displacement change value of the upper ejector cylinder. This indicates the displacement change of the lower ejector cylinder. This represents the derivative of the displacement of the upper ejector cylinder with respect to time, i.e., the velocity of the upper ejector cylinder. This represents the derivative of the displacement of the lower ejector cylinder with respect to time, i.e., the velocity of the lower ejector cylinder.

[0025] A further improvement of the synchronous floating hydraulic control system for the upper and lower ejector cylinders of a forging hydraulic press of the present invention is that the programmable controller is equipped with a flow control formula.

[0026] The flow control formula is:

[0027] in, This indicates the flow rate of either the first or second proportional servo valve. Indicates the proportional parameter. Indicates the integration parameter. This represents the differential parameter.

[0028] A further improvement of the present invention regarding the synchronous floating hydraulic control system for the upper and lower ejector cylinders of a forging hydraulic press lies in that the programmable controller will... The analog output module converts the signal into a 4~20mA control signal, which is then used to regulate the flow rate of the first proportional servo valve or the second proportional servo valve.

[0029] A further improvement of the present invention regarding the synchronous floating hydraulic control system for the upper and lower ejector cylinders of a forging hydraulic press lies in that the programmable controller will... The analog output module converts the signal into a ±10V control signal, which is then used to regulate the flow rate of the first or second proportional servo valve.

[0030] A further improvement of the present invention regarding the synchronous floating hydraulic control system for the upper and lower ejector cylinders of a forging hydraulic press lies in the following: The control error is 0.5 mm / s.

[0031] This invention achieves stable clamping of the billet by setting clamping force balance formulas and ejection force balance formulas in a programmable controller. It uses a proportional pump source to control the rapid regulation of hydraulic oil, a proportional servo valve to control the micro-speed regulation of hydraulic oil, and a pressure sensor and proportional pressure valve to achieve precise control of hydraulic oil flow. Combined with the displacement rate of a displacement sensor, the speed control formula and flow control formula in the programmable controller precisely regulate the hydraulic oil flow, achieving precise position control of the upper and lower ejection cylinders. This allows the upper and lower ejection cylinders to move synchronously and accurately, improving the stability of billet loading.

[0032] The control system of this invention significantly improves the stability of billet feeding. Because the upper and lower ejector cylinders can move precisely and synchronously, the billet is stably clamped during the processing, thereby avoiding processing errors caused by billet shaking or misalignment, and improving the processing accuracy and quality of the product.

[0033] The intelligent monitoring function of the control system of this invention further enhances the safety and reliability of the equipment. When abnormal hydraulic oil pressure is detected, the system can immediately activate the early warning mechanism to promptly remind operators to take appropriate measures, effectively preventing equipment failure or safety accidents. This not only ensures the normal operation of the production line but also reduces downtime and maintenance costs caused by equipment failure.

[0034] The precise control capabilities of the control system in this invention also result in excellent energy efficiency. By precisely controlling the flow and pressure of the hydraulic oil, the system can rationally allocate energy according to actual processing needs, avoiding unnecessary energy waste and reducing production costs.

[0035] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of a synchronous floating hydraulic control system for the upper and lower ejector cylinders of a forging hydraulic press provided by the present invention.

[0038] Figure label:

[0039] 101, First proportional pump source; 201, First proportional servo valve; 301, First upper proportional pressure valve; 401, Second upper proportional pressure valve; 501, First upper pressure sensor; 601, Second upper pressure sensor; 701, Third upper pressure sensor; 801, Upper ejector cylinder; 901, Upper displacement sensor;

[0040] 102, Second proportional pump source; 202, Second proportional servo valve; 302, First lower proportional pressure valve; 402, Second lower proportional pressure valve; 502, First lower pressure sensor; 602, Second lower pressure sensor; 702, Third lower pressure sensor; 802, Lower ejector cylinder; 902, Lower displacement sensor. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention. The following embodiments are used to illustrate this invention but should not be used to limit the scope of this invention.

[0042] The following is combined Figure 1 The present invention describes a synchronous floating hydraulic control system for the upper and lower ejector cylinders of a forging hydraulic press, comprising an upper control unit connected to the upper ejector cylinder 801, a lower control unit connected to the lower ejector cylinder 802, and a programmable controller connected to the upper control unit and the lower control unit, wherein the upper control unit and the lower control unit are connected to an oil tank.

[0043] The programmable controller controls the lower control unit to operate, thereby controlling the lower plunger of the lower ejector cylinder 802 to push upward, so that the loading robot places the billet on top of the lower plunger. Then, the programmable controller adjusts the operation of the upper control unit according to the clamping force balance formula, thereby controlling the upper plunger of the upper ejector cylinder 801 to extend downward, so that the billet is clamped between the upper plunger and the lower plunger.

[0044] The clamping force balance formula is: ,

[0045] in, This indicates the clamping force of the upper ejector cylinder. This indicates the working pressure of the upper cylinder. This indicates the effective area of ​​the upper plunger. This represents the weight of the billet. This represents the frictional force at the clamping contact surfaces of the upper and lower pistons.

[0046] In a preferred embodiment of the synchronous floating hydraulic control system for the upper and lower ejector cylinders of a forging hydraulic press, the upper control unit includes a first proportional pump source 101, a first proportional servo valve 201, a first upper proportional pressure valve 301, a second upper proportional pressure valve 401, a first upper pressure sensor 501, a second upper pressure sensor 601, a third upper pressure sensor 701, and an upper displacement sensor 901.

[0047] The first proportional pump source 101 is connected to the oil tank. The first proportional pump source 101 is provided with a first oil outlet. The first proportional servo valve 201 is connected to the first oil outlet. The first proportional servo valve 201 has a first valve oil outlet and a second valve oil outlet. The first valve oil outlet and the first upper interface of the upper ejector cylinder 801 are connected through a first oil circuit pipe. The second valve oil outlet and the second upper interface of the upper ejector cylinder 801 are connected through a second oil circuit pipe.

[0048] The first upper proportional pressure valve 301 is connected to the oil tank and the first oil circuit pipeline, and the second upper proportional pressure valve 401 is connected to the oil tank and the second oil circuit pipeline.

[0049] The first upper pressure sensor 501 is disposed between the first proportional servo valve 201 and the first proportional pump source 101, the second upper pressure sensor 601 is disposed in the first oil circuit pipeline, the third upper pressure sensor 701 is disposed in the second oil circuit pipeline, and the upper displacement sensor 901 is connected to the upper ejector cylinder 801.

[0050] Specifically, the programmable controller regulates the upper control unit and the lower control unit through the top output force balance formula to control the upper plunger and the lower plunger to move synchronously, so as to complete the automatic feeding of the billet;

[0051] The formula for balancing the top output force is: ,

[0052] in, This indicates that the pressure measured by the first proportional pressure valve of the upper ejector cylinder is converted into the ejector force of the upper ejector cylinder. This indicates that the pressure measured by the second proportional pressure valve of the upper ejector cylinder is converted into the ejector force of the upper ejector cylinder. This represents the sum of the weight of the billet, the weight of the upper piston, and the frictional force between the upper and lower pistons.

[0053] Furthermore, the lower control unit includes a second proportional pump source 102, a second proportional servo valve 202, a first lower proportional pressure valve 302, a second lower proportional pressure valve 402, a first lower pressure sensor 502, a second lower pressure sensor 602, a third lower pressure sensor 702, and a lower displacement sensor 902.

[0054] The second proportional pump source 102 is connected to the oil tank. The second proportional pump source 102 is provided with a second oil outlet. The second proportional servo valve 202 is connected to the second oil outlet. The second proportional servo valve 202 has a third valve oil outlet and a fourth valve oil outlet. The third valve oil outlet and the first lower interface of the lower ejector cylinder 802 are connected through a third oil circuit pipe. The fourth valve oil outlet and the second lower interface of the lower ejector cylinder 802 are connected through a fourth oil circuit pipe.

[0055] The first lower proportional pressure valve 302 is connected to the oil tank and the third oil circuit pipeline, and the second lower proportional pressure valve 402 is connected to the oil tank and the fourth oil circuit pipeline;

[0056] The first downpressure sensor 502 is disposed between the second proportional servo valve 202 and the second proportional pump source 102, the second downpressure sensor 602 is disposed in the third oil circuit pipeline, the third downpressure sensor 702 is disposed in the fourth oil circuit pipeline, and the downdisplacement sensor 902 is connected to the downpour cylinder 802.

[0057] Furthermore, the programmable controller is equipped with a speed control formula;

[0058] The speed control formula is:

[0059] in, This indicates the speed difference between the upper and lower cylinder ejection points. This indicates the displacement change value of the upper ejector cylinder. This indicates the displacement change of the lower ejector cylinder. This represents the derivative of the displacement of the upper ejector cylinder with respect to time, i.e., the velocity of the upper ejector cylinder. This represents the derivative of the displacement of the lower ejector cylinder with respect to time, i.e., the velocity of the lower ejector cylinder.

[0060] Furthermore, the programmable controller is equipped with a flow control formula;

[0061] The flow control formula is:

[0062] in, This indicates the flow rate of either the first or second proportional servo valve. Indicates the proportional parameter. Indicates the integration parameter. This represents the differential parameter.

[0063] Specifically, the proportional parameter, integral parameter, and derivative parameter are fixed parameter settings based on the control system, and can be set according to control requirements.

[0064] Preferably, in one specific embodiment The value is 0.8. The value is 0.05. The value is 0.1.

[0065] Furthermore, the programmable controller will The analog output module converts the signal into a 4~20mA control signal, which is then used to regulate the flow rate of the first proportional servo valve or the second proportional servo valve.

[0066] Furthermore, the programmable controller will The analog output module converts the signal into a ±10V control signal, which is then used to regulate the flow rate of the first or second proportional servo valve.

[0067] Furthermore, The control error is 0.5 mm / s.

[0068] In one specific embodiment, taking the machining of an aluminum alloy forging as an example:

[0069] Step 1: Set specific parameters: Set the weight of the billet to 102kg in the programmable controller, then the gravity of the billet... Approximately 1000N, setting the effective area of ​​the upper piston. It is 0.0113m 2 Set the working pressure of the ejector cylinder The calculated clamping force of the upper ejector cylinder is 1.5 MPa. ;

[0070] Based on the material of the billet and the materials of the upper and lower pistons, the coefficient of kinetic friction is 0.3. Therefore, the following can be estimated: The value is 300N. At this time, 16950N>1300N, which meets the clamping requirements and can prevent the billet from slipping. The programmable controller controls the upper piston to extend through the upper control unit so that the aluminum alloy forging is stably clamped between the upper piston and the lower piston.

[0071] Step Two: The sum of the weight of the billet, the weight of the upper piston, and the frictional force between the upper and lower pistons is 1800N. The second upper proportional pressure valve is in pressurized state, and the pressure of the first upper proportional pressure valve is set to 2.2MPa. ,

[0072] The pressure of the second upper proportional pressure valve is 1.8 MPa. The second upper proportional pressure valve is in passive oil discharge mode, mainly determined by the system back pressure. An upper limit can be set. ;

[0073] Finally, the output force balance formula was used for verification: 24860N + 1800N = 26660N > 20340N, which satisfies the downward condition;

[0074] Step 3: Set specific parameters: target synchronous downlink speed ;

[0075] Set the synchronization control accuracy requirements: cumulative position error < ±0.2mm, instantaneous speed difference ;

[0076] If at a certain moment the movement speed of the upper ejector cylinder is detected to be 15.3 mm / s and the movement speed of the lower ejector cylinder is 14.5 mm / s, then the speed difference between the upper and lower ejector cylinders is... =0.8mm / s, which exceeds the allowable range for instantaneous velocity difference;

[0077] Programmable Logic Controller (PLC) Calculate flow A negative value indicates that the flow rate to the upper ejector cylinder needs to be slightly reduced or the flow rate to the lower ejector cylinder needs to be increased.

[0078] The programmable controller converts the calculated flow adjustment command into a ±10V or 4~20mA signal, which acts on the first or second proportional servo valve to fine-tune its opening or flow distribution, quickly adjusting the flow rate. Reduce and maintain the speed within ±0.5 mm / s to ensure that the upper and lower cylinders descend synchronously;

[0079] After the billet is pressed, the second upper proportional pressure valve pressurizes, the first upper proportional pressure valve passively discharges oil, and at the same time, the upper control unit and the lower control unit are adjusted according to the ejection force balance formula to achieve synchronous upward movement of the upper ejection cylinder and the lower ejection cylinder.

[0080] Step 4: The feeding robot clamps the material, the upper ejector cylinder and the lower ejector cylinder retract, and the feeding robot discharges the material, completing the automatic feeding of the billet.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A synchronous floating hydraulic control system for the upper and lower ejector cylinders of a forging hydraulic press, characterized in that, It includes an upper control unit connected to the upper ejector cylinder, a lower control unit connected to the lower ejector cylinder, and a programmable controller connected to the upper control unit and the lower control unit, wherein the upper control unit and the lower control unit are connected to the oil tank; The programmable controller controls the lower control unit to control the lower plunger of the lower ejector cylinder to push upward, so that the loading robot places the billet on top of the lower plunger. Then, the programmable controller adjusts the upper control unit according to the clamping force balance formula to control the upper plunger of the upper ejector cylinder to extend downward, so that the billet is clamped between the upper plunger and the lower plunger. The clamping force balance formula is: , in, This indicates the clamping force of the upper ejector cylinder. This indicates the working pressure of the upper cylinder. This indicates the effective area of ​​the upper plunger. This represents the weight of the billet. This represents the frictional force at the clamping contact surfaces of the upper and lower pistons. The upper control unit includes a first proportional pump source, a first proportional servo valve, a first upper proportional pressure valve, a second upper proportional pressure valve, a first upper pressure sensor, a second upper pressure sensor, a third upper pressure sensor, and an upper displacement sensor. The first proportional pump source is connected to the oil tank. The first proportional pump source is provided with a first oil outlet. The first proportional servo valve is connected to the first oil outlet. The first proportional servo valve has a first valve oil outlet and a second valve oil outlet. The first valve oil outlet and the first upper interface of the upper ejector cylinder are connected through a first oil circuit pipe. The second valve oil outlet and the second upper interface of the upper ejector cylinder are connected through a second oil circuit pipe. The first upper proportional pressure valve is connected to the oil tank and the first oil circuit pipeline, and the second upper proportional pressure valve is connected to the oil tank and the second oil circuit pipeline. The first upper pressure sensor is disposed between the first proportional servo valve and the first proportional pump source, the second upper pressure sensor is disposed in the first oil circuit pipeline, the third upper pressure sensor is disposed in the second oil circuit pipeline, and the upper displacement sensor is connected to the upper ejector cylinder. The lower control unit includes a second proportional pump source, a second proportional servo valve, a first lower proportional pressure valve, a second lower proportional pressure valve, a first lower pressure sensor, a second lower pressure sensor, a third lower pressure sensor, and a lower displacement sensor; The second proportional pump source is connected to the oil tank. The second proportional pump source is provided with a second oil outlet. The second proportional servo valve is connected to the second oil outlet. The second proportional servo valve has a third valve outlet and a fourth valve outlet. The third valve outlet and the first lower interface of the lower ejector cylinder are connected through a third oil circuit pipe. The fourth valve outlet and the second lower interface of the lower ejector cylinder are connected through a fourth oil circuit pipe. The first lower proportional pressure valve is connected to the oil tank and the third oil circuit pipeline, and the second lower proportional pressure valve is connected to the oil tank and the fourth oil circuit pipeline; The first downward pressure sensor is disposed between the second proportional servo valve and the second proportional pump source, the second downward pressure sensor is disposed in the third oil circuit pipeline, the third downward pressure sensor is disposed in the fourth oil circuit pipeline, and the downward displacement sensor is connected to the downward ejector cylinder; The programmable controller is equipped with a speed control formula; The speed control formula is: in, This indicates the speed difference between the upper and lower cylinder ejection points. This indicates the displacement change value of the upper ejector cylinder. This indicates the displacement change of the lower ejector cylinder. This represents the derivative of the displacement of the upper ejector cylinder with respect to time, i.e., the velocity of the upper ejector cylinder. This represents the derivative of the displacement of the lower ejector cylinder with respect to time, i.e., the velocity of the lower ejector cylinder. The programmable controller is equipped with a flow control formula; The flow control formula is: in, This indicates the flow rate of either the first or second proportional servo valve. Indicates the proportional parameter. Indicates the integration parameter. This represents the differential parameter.

2. A synchronized floating hydraulic control system for upper and lower knockout cylinders of a forging hydraulic press according to claim 1, characterized in that, The programmable controller regulates the upper control unit and the lower control unit through the top force balance formula to control the upper plunger and the lower plunger to move synchronously, so as to complete the automatic feeding of the billet; The ejection force balance formula is: , in, This indicates the pressure of the first proportional pressure valve on the upper ejector cylinder. This indicates the pressure of the second proportional pressure valve on the upper ejector cylinder. This represents the sum of the weight of the billet, the weight of the upper piston, and the frictional force between the upper and lower pistons.

3. A synchronized floating hydraulic control system for upper and lower knockout cylinders of a forging press as set forth in claim 1, characterized in that, The programmable controller will The analog output module converts the signal into a 4~20mA control signal, which is then used to regulate the flow rate of the first proportional servo valve or the second proportional servo valve.

4. The upper and lower ejecting cylinder synchronous floating hydraulic control system of a forging hydraulic press according to claim 1, characterized in that, The programmable controller will The analog output module converts the signal into a ±10V control signal, which is then used to regulate the flow rate of the first or second proportional servo valve.

5. The synchronized floating hydraulic control system for upper and lower eject cylinders of a forging hydraulic press according to claim 1, characterized in that, The regulation error is 0.5 mm / s.

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