A pneumatic control system for superplastic forming of a hot forming device

Abstract

An embodiment of the present invention discloses a pneumatic control system for superplastic forming of a hot forming device. The system includes: a high-pressure gas cylinder, a high-pressure filter, an inlet pressure sensor, a pilot reducing valve, a pilot electro-pneumatic proportional valve, an outlet pressure sensor, a voltage stabilizing component, an intake valve, a pressure relief component, and a lower controller. The high-pressure gas cylinder is connected to the high-pressure filter to provide a high-pressure gas power source to the high-pressure filter; the high-pressure filter is connected to the pilot reducing valve and the pilot electro-pneumatic proportional valve to output pure gas to the pilot reducing valve and the pilot electro-pneumatic proportional valve; the pilot reducing valve reduces and stabilizes the pressure of the gas source to a fixed value so that the pilot electro-pneumatic proportional valve obtains a stable gas source power. The embodiment of the present invention can keep the workpiece in a high-pressure state through the cooperation of the pilot electro-pneumatic proportional valve and the exhaust valve, so that the whole system is in a high-precision and high-efficiency working state.

Description

Technical Field

[0001] The present invention relates to the technical field of superplastic forming, and in particular to a pneumatic control system for superplastic forming of a hot forming device. Background Art

[0002] In order to ensure the transverse fatigue strength and toughness of materials and save production task time, it is necessary to perform superplastic forming on workpieces.

[0003] Currently, the superplastic forming system of a hot forming device uses a combination of a pressure gauge, a gas flow regulating valve, and a ball valve as the main adjustment method. The gas flow regulating valve is generally manually adjusted, and the gas flow regulating valve is operated by observing the pressure feedback by the pressure gauge. When the gas pressure is higher than the set value, the ball valve is operated. The main function of the ball valve is to relieve pressure; when the gas pressure is manually adjusted, it requires manpower, and during the operation process, it needs to be carefully operated and the gas pressure cannot be accurately controlled. Due to the foregoing structure, the pneumatic control system of the superplastic of the hot forming device wastes manpower and material resources and has poor control accuracy. Summary of the Invention

[0004] The technical problem solved by the present invention is: overcoming the deficiencies of the prior art, and providing a pneumatic control system for superplastic forming of a hot forming device.

[0005] In order to solve the above technical problem, an embodiment of the present invention provides a pneumatic control system for superplastic forming of a hot forming device. The system includes: a high-pressure gas cylinder, a high-pressure filter, an inlet pressure sensor, a pilot reducing valve, a pilot electro-pneumatic proportional valve, an outlet pressure sensor, a voltage stabilizing component, an intake valve, a pressure relief component, and a lower controller. Among them,

[0006] The high-pressure gas cylinder is communicated with the high-pressure filter to provide a high-pressure gas power source for the high-pressure filter;

[0007] The high-pressure filter is connected to the pilot reducing valve and the pilot electro-pneumatic proportional valve to output pure gas to the pilot reducing valve and the pilot electro-pneumatic proportional valve;

[0008] The pilot reducing valve reduces and stabilizes the pressure of the gas source to a fixed value so that the pilot electro-pneumatic proportional valve obtains a stable gas source power;

[0009] The pilot electro-pneumatic proportional valve is arranged on the output end side of the pilot reducing valve. A control signal is output by the lower controller, and the control signal is converted into a low-pressure pressure signal through the electro-pneumatic proportional valve;

[0010] The gas proportional valve is arranged on the output end side of the high-pressure filter to adjust the high-pressure gas output by the high-pressure filter;

[0011] The low-pressure gas pressure signal converted by the electro-hydraulic proportional valve controls the valve opening of the gas proportional valve to control the high-pressure intake pressure;

[0012] The inlet pressure sensor is arranged on the output end side of the high-pressure filter to detect the pressure detection value generated by the intake source gas and send the pressure detection value to the lower controller;

[0013] The outlet pressure sensor is arranged on the output end side of the pilot electro-hydraulic proportional valve to detect the pressure inside the high-pressure workpiece to generate a pressure detection value and send the pressure detection value to the lower controller;

[0014] The voltage stabilizing component is arranged on the output end side of the pressure sensor to buffer and stabilize the gas pressure output by the pilot electro-hydraulic proportional valve;

[0015] The intake valve is arranged on the output end side of the voltage stabilizing component to control whether to intake gas into the high-pressure workpiece;

[0016] The lower controller controls the working states of the pilot electro-hydraulic proportional valve, the intake valve and the exhaust valve according to the feedback operation of the pressure detection value and the set pressure value range;

[0017] The pressure relief component, when the pressure of the high-pressure workpiece exceeds the set pressure value range or after the entire work process is completed, controls the exhaust valve and the pneumatic valve to open through the lower controller, so that the gas in the high-pressure workpiece is discharged.

[0018] Optionally, the voltage stabilizing component is an accumulator and a stop valve;

[0019] The accumulator is used to buffer and stabilize the high-pressure gas when the pilot electro-hydraulic proportional valve outputs high-pressure gas.

[0020] Optionally, the pressure relief component is an exhaust valve and a pneumatic valve;

[0021] The pressure relief component, when the pressure of the high-pressure workpiece exceeds the set pressure value range or after the entire work process is completed, makes the lower controller control the pneumatic valve and the exhaust valve to open, so that the gas in the high-pressure workpiece is discharged.

[0022] Optionally, when the lower controller receives the set pressure value and the pressure boost time sent by the upper controller, it controls the pilot electro-hydraulic proportional valve to start working and controls the intake valve to open.

[0023] Optionally, the pressure sensor, the pilot electro-hydraulic proportional valve, the intake valve and the exhaust valve generate working state signals and send the working state signals to the lower controller.

[0024] Optionally, the inlet pressure sensor is disposed on the output side of the high-pressure filter to detect the pressure detection value generated by the intake source gas and send the pressure detection value to the lower controller;

[0025] The outlet pressure sensor is disposed on the output side of the pilot electric proportional valve to detect the pressure inside the high-pressure workpiece to generate a pressure detection value and send the pressure detection value to the lower controller.

[0026] Optionally, the lower controller is a structure composed of an electric proportional valve and a gas proportional valve through the pilot electric proportional valve;

[0027] Wherein, the electric proportional valve is disposed on the output side of the pilot pressure reducing valve, and the lower controller outputs a control signal, and converts the control signal into a low-pressure signal through the electric proportional valve;

[0028] The low-pressure gas pressure signal converted by the electric proportional valve controls the valve opening of the gas proportional valve to control the high-pressure intake pressure.

[0029] Optionally, the system further includes: an upper controller or an input device;

[0030] The upper controller is used to input the set pressure value;

[0031] The upper controller communicates with the lower controller to send the set pressure value range to the lower controller.

[0032] Optionally, the system further includes: an output device,

[0033] The lower controller sends the pressure detection value to the upper controller;

[0034] The output device is used to display and output the pressure detection value.

[0035] The advantages of the present invention compared with the prior art are as follows: In the embodiment of the present invention, a pilot electric proportional valve and a pilot pressure reducing valve are used to regulate the output of high-pressure gas, an outlet pressure sensor is used to actively test the actual pressure value of the high-pressure gas, and the exhaust valve is used to avoid overpressure in the workpiece; after the pressure in the workpiece reaches the preset pressure range, the pilot electric proportional valve and the exhaust valve can be coordinated to keep the high-pressure state in the workpiece, so that the whole system is in a high-precision and high-efficiency working state. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic structural diagram of a pneumatic control system for superplastic forming of a hot forming device provided by an embodiment of the present invention;

[0037] Reference Signs:

[0038] 1 - High-pressure gas cylinder, 2 - High-pressure filter, 3 - Inlet pressure sensor, 4 - Pilot reducing valve, 5 - Pilot electro-pneumatic proportional valve, 6 - Pressure stabilizing component, 7 - Outlet pressure sensor, 8 - Pneumatic valve, 9 - Exhaust valve, 10 - Lower controller, 11 - Workpiece. Detailed implementation mode

[0039] Referring to Figure 1 , a structural schematic diagram of a pneumatic control system for superplastic forming of a hot forming device provided by an embodiment of the present invention is shown. As Figure 1 shown, the system may include: a high-pressure gas cylinder 1, a high-pressure filter 2, an inlet pressure sensor 3, a pilot reducing valve 4, a pilot electro-pneumatic proportional valve 5, an outlet pressure sensor 7, a pressure stabilizing component 6, a pneumatic valve 8, an exhaust valve 9, a pressure relief component, a lower controller 10, and a workpiece 11.

[0040] The high-pressure gas cylinder 1 is used to store high-pressure gas for production, and input pure high-pressure gas to the workpiece through the high-pressure filter. This high-pressure gas is an inert gas, such as nitrogen, argon, etc.

[0041] The high-pressure filter 2 is used to filter out solid and liquid impurities in compressed air below 4 Mpa and output pure gas to the pilot reducing valve and the pneumatic proportional valve.

[0042] The inlet pressure sensor 3 is used to test the gas pressure of the input high-pressure gas and transmit the collected signal to the lower controller 10.

[0043] The pilot reducing valve 4 is used to reduce and stabilize the pressure of the gas source to a fixed value so that the proportional valve can obtain stable gas source power for electro-pneumatic proportional valve control;

[0044] The pilot electro-pneumatic proportional valve 5 is a structural body composed of an electro-pneumatic proportional valve and a gas proportional valve.

[0045] Among them, the electro-pneumatic proportional valve is arranged on the output end side of the pilot reducing valve, and a control signal is output by the lower controller 10, and the control signal is converted into a low-pressure pressure signal through the electro-pneumatic proportional valve.

[0046] The gas proportional valve is arranged on the output end side of the high-pressure filter and is used to adjust the high-pressure gas output by the high-pressure filter.

[0047] The valve opening of the gas proportional valve is controlled by the low-pressure gas pressure signal converted by the electro-pneumatic proportional valve, so as to accurately control the high-pressure intake pressure.

[0048] The pressure stabilizing component 6 includes an accumulator and a stop valve. The pressure stabilizing component 6 is arranged on the output end side of the pressure sensor and is used to buffer and stabilize the gas pressure output by the pilot electro-pneumatic proportional valve.

[0049] The pneumatic valve 8 is output with a control signal by the lower controller 10 and is used to input high-pressure gas into the die workpiece 11. When used simultaneously with the exhaust valve 9, a control signal is output by the lower controller 10,

[0050] The outlet pressure sensor 7 is used to test the high-pressure gas pressure in the workpiece 11 and collect signals for transmission to the lower controller 10.

[0051] The system provided by the embodiment of the present invention, in addition to including the foregoing components, may further include an upper controller and an input device. Among them, the input device is used to input the foregoing set pressure value range to the upper controller; the upper controller communicates with the lower controller 10 and sends the foregoing set pressure value range to the lower controller 10.

[0052] The lower controller 10 may also send the received pressure detection value to the upper controller. In addition, the pneumatic control system may further include an output device; the output device is used to display the output pressure detection value, so that the user can understand the pressure change situation during the test process in real time. In the specific application of this embodiment, the upper controller and the lower controller 10 may communicate using protocols such as TPC / IP, or may communicate using other existing bus protocols, and the embodiments of this specification do not make special limitations.

[0053] In addition, the pneumatic control system may further include an output device; the output device is used to display the pressure detection value obtained by the upper controller; in the foregoing application, when the lower controller 10 can obtain the working state signals of each working component and send the foregoing working state signals to the upper controller, the output device may further output the working states of each working component.

[0054] In specific applications, the foregoing input device and output device may be integrated into one device, for example, may be integrated into a touch display screen.

[0055] In addition, the pneumatic control system may further include a control component such as a button to control whether the system starts up or shuts down emergently.

[0056] In practical applications, the forming of the workpiece is in a specific die with a certain external pressure applied. When the workpiece is being formed, it is a P-T curve, and as time increases, the gas pressure gradually increases; it can be seen from this that superplastic forming is a very long process, and during the superplastic process, stable and precise pressure is an important indicator of whether a product is qualified.

[0057] The specific embodiments described in this application can enable those skilled in the art to understand this application more comprehensively, but do not limit this application in any way. Therefore, those skilled in the art should understand that modifications or equivalent replacements are still made to this application; and all technical solutions and their improvements that do not depart from the spirit and technical essence of this application should be covered by the protection scope of the patent of this application.

[0058] The content not described in detail in the specification of the present invention belongs to the well-known technology of those skilled in the art.

Claims

1. A pneumatic control system for superplastic forming of a hot forming device, characterized in that, The system includes: a high-pressure gas cylinder, a high-pressure filter, an inlet pressure sensor, a pilot pressure reducing valve, a pilot electro-hydraulic proportional valve, an outlet pressure sensor, a pressure stabilizing component, an intake valve, a pressure relief component, and a lower-level controller. Among them, the high-pressure gas cylinder is connected to the high-pressure filter to provide a high-pressure gas power source for the high-pressure filter; the high-pressure filter is connected to the pilot pressure reducing valve and the pilot electro-hydraulic proportional valve to output pure gas to the pilot pressure reducing valve and the pilot electro-hydraulic proportional valve; the pilot pressure reducing valve reduces and stabilizes the pressure of the gas source to a fixed value so that the pilot electro-hydraulic proportional valve obtains a stable gas source power; the pilot electro-hydraulic proportional valve is arranged on the output end side of the pilot pressure reducing valve. The lower-level controller outputs a control signal, and converts the control signal into a low-pressure signal through the electro-hydraulic proportional valve; the gas proportional valve is arranged on the output end side of the high-pressure filter to adjust the high-pressure gas output by the high-pressure filter; the low-pressure gas pressure signal converted by the electro-hydraulic proportional valve controls the valve opening of the gas proportional valve to control the high-pressure intake pressure; the inlet pressure sensor is arranged on the output end side of the high-pressure filter to detect the pressure detection value generated by detecting the intake gas source, and send the pressure detection value to the lower-level controller; the outlet pressure sensor is arranged on the output end side of the pilot electro-hydraulic proportional valve to detect the pressure inside the high-pressure workpiece to generate a pressure detection value, and send the pressure detection value to the lower-level controller; the pressure stabilizing component is arranged on the output end side of the pressure sensor to buffer and stabilize the gas pressure output by the pilot electro-hydraulic proportional valve; the intake valve is arranged on the output end side of the pressure stabilizing component to control whether to intake gas into the high-pressure workpiece; the pressure relief component is an exhaust valve and a pneumatic valve. When the pressure in the high-pressure workpiece exceeds the set pressure value range or after the entire work process is completed, the exhaust valve and the pneumatic valve are controlled to open by the lower-level controller to discharge the gas inside the high-pressure workpiece; the lower-level controller controls the working states of the pilot electro-hydraulic proportional valve, the intake valve, and the exhaust valve according to the feedback operation of the pressure detection value and the set pressure value range.

2. The system according to claim 1, wherein The system further includes: an upper-level controller or an input device; the upper-level controller is used to input the set pressure value; the upper-level controller communicates with the lower-level controller to send the set pressure value range to the lower-level controller.

3. The system according to claim 1, wherein The pressure stabilizing component is an accumulator and a stop valve; the accumulator is used to buffer and stabilize the high-pressure gas when the pilot electro-hydraulic proportional valve outputs high-pressure gas.

4. The system according to claim 2, wherein When the lower-level controller receives the set pressure value and the pressure boost time sent by the upper-level controller, it controls the pilot electro-hydraulic proportional valve to start working and controls the intake valve to open.

5. The system according to claim 1, wherein the pressure sensor, the pilot electro-hydraulic proportional valve, the intake valve, and the exhaust valve generate working state signals and send the working state signals to the lower-level controller.

6. The system according to claim 1, wherein The imported pressure sensor is arranged on the output end side of the high-pressure filter to detect the pressure detection value generated by the intake source gas and send the pressure detection value to the lower controller; The outlet pressure sensor is arranged on the output end side of the pilot electric proportional valve to detect the pressure inside the high-pressure workpiece to generate a pressure detection value and send the pressure detection value to the lower controller.

7. The system according to claim 1, wherein The lower controller is a structure composed of an electric proportional valve and a gas proportional valve through the pilot electric proportional valve; Among them, the electric proportional valve is arranged on the output end side of the pilot pressure reducing valve, and the lower controller outputs a control signal, and converts the control signal into a low-pressure pressure signal through the electric proportional valve; The low-pressure gas pressure signal converted by the electric proportional valve controls the valve opening of the gas proportional valve to control the high-pressure intake pressure.

8. The system according to claim 2, wherein The system further includes: an output device, The lower controller sends the pressure detection value to the upper controller; The output device displays and outputs the pressure detection value.

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