WO2020045300A1 - Coussin - Google Patents

Coussin Download PDF

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Publication number
WO2020045300A1
WO2020045300A1 PCT/JP2019/033114 JP2019033114W WO2020045300A1 WO 2020045300 A1 WO2020045300 A1 WO 2020045300A1 JP 2019033114 W JP2019033114 W JP 2019033114W WO 2020045300 A1 WO2020045300 A1 WO 2020045300A1
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WO
WIPO (PCT)
Prior art keywords
pressure
hydraulic
hydraulic pump
die cushion
relief valve
Prior art date
Application number
PCT/JP2019/033114
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English (en)
Japanese (ja)
Inventor
淳浩 上林
中村　博一
Original Assignee
ダイキン工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ダイキン工業株式会社 filed Critical ダイキン工業株式会社
Priority to EP19854535.2A priority Critical patent/EP3845324B1/fr
Publication of WO2020045300A1 publication Critical patent/WO2020045300A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/10—Devices controlling or operating blank holders independently, or in conjunction with dies
    • B21D24/14—Devices controlling or operating blank holders independently, or in conjunction with dies pneumatically or hydraulically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/26—Programme control arrangements

Definitions

  • a die cushion device using a hydraulic cylinder is used for a press machine (for example, see Japanese Patent Application Laid-Open No. 2006-142212 (Patent Document 1)).
  • the present disclosure proposes a die cushion device that suppresses surge pressure generated from a hydraulic cylinder in die cushion pressure control of a press machine.
  • Die cushion device of the present disclosure A hydraulic cylinder that moves the cushion pad up and down, A first hydraulic pump for supplying hydraulic oil from an oil tank to the hydraulic cylinder, A relief valve for returning hydraulic oil discharged from the hydraulic cylinder to the oil tank; A pressure sensor for detecting a pressure of hydraulic oil in a flow path between the hydraulic cylinder and the first hydraulic pump; A control device for controlling the number of revolutions of the first hydraulic pump according to the pressure of the hydraulic oil detected by the pressure sensor, The control device includes: When the pressure of the hydraulic oil detected by the pressure sensor is equal to or more than a predetermined pressure value, the first hydraulic pump is rotated in reverse.
  • the control device rotates the hydraulic pump in accordance with the pressure of hydraulic oil in the flow path between the hydraulic cylinder and the first hydraulic pump detected by the pressure sensor. Control the number.
  • the hydraulic pump is controlled by the control device. Reverse rotation.
  • a die cushion device includes: The pressure sensor detects a pressure of hydraulic oil, which is a die cushion pressure of the hydraulic cylinder,
  • the control device includes: By controlling the rotation speed of the first hydraulic pump according to the pressure of the hydraulic oil detected by the pressure sensor, the flow rate and the pressure of the hydraulic oil supplied from the first hydraulic pump to the hydraulic cylinder are controlled. Along with Controlling the number of revolutions of the first hydraulic pump so that the pressure of the hydraulic oil detected by the pressure sensor becomes a die cushion pressure command value; When the pressure of the hydraulic oil detected by the pressure sensor is equal to or higher than the set pressure of the relief valve, which is the predetermined pressure value, the first hydraulic pump is rotated in reverse.
  • the control device controls the number of rotations of the hydraulic pump in accordance with the pressure of the operating oil detected by the pressure sensor (corresponding to the die cushion pressure), whereby the hydraulic pump Controls the flow rate and pressure of hydraulic oil supplied from the hydraulic cylinder to the hydraulic cylinder.
  • a surge pressure is generated in the hydraulic cylinder during press forming, and the pressure of the hydraulic oil, which is the die cushion pressure of the hydraulic cylinder, is equal to the predetermined pressure value of the relief valve.
  • the hydraulic pump When the relief valve operates, the hydraulic oil discharged from the hydraulic cylinder is returned to the oil tank, and when the hydraulic oil pressure detected by the pressure sensor becomes equal to or higher than the set pressure of the relief valve, the hydraulic pump is controlled by the control device. To reverse rotation. By performing the pressure control by the hydraulic pump with high accuracy and high speed, it is possible to suppress the surge pressure generated from the hydraulic cylinder in the die cushion pressure control.
  • the flow path between the hydraulic cylinder and the first hydraulic pump is disposed closer to the first hydraulic pump than a connection point where the relief valve is connected, and is connected to the first hydraulic pump from the hydraulic cylinder. Equipped with a check valve that regulates the flow of hydraulic oil to the The set pressure of the relief valve is controlled by the pressure of the hydraulic oil discharged from the first hydraulic pump, When the pressure of the hydraulic oil detected by the pressure sensor is equal to or higher than the set pressure of the relief valve, the control device rotates the first hydraulic pump in the reverse direction to open the relief valve.
  • the control device when the pressure of the hydraulic oil detected by the pressure sensor is equal to or higher than the set pressure of the relief valve, the control device causes the hydraulic pump to rotate in the reverse direction. At this time, the relief valve operates to return the hydraulic oil discharged from the hydraulic cylinder to the oil tank.
  • a second hydraulic pump for controlling a set pressure of the relief valve includes: When the pressure of the hydraulic oil detected by the pressure sensor becomes equal to or higher than the set pressure of the relief valve, the first hydraulic pump is rotated in reverse, and the pressure of the hydraulic oil detected by the pressure sensor becomes the die cushion pressure. While controlling the number of revolutions of the hydraulic first pump so as to be a command value, After the reverse rotation of the first hydraulic pump starts, when the pressure of the hydraulic oil detected by the pressure sensor reaches the die cushion pressure command value, the set pressure of the relief valve is increased to close the relief valve, The number of rotations of the second hydraulic pump is controlled.
  • the control device when the pressure of the hydraulic oil detected by the pressure sensor becomes equal to or higher than the set pressure of the relief valve, the control device causes the hydraulic pump to rotate in the reverse direction, and the pressure of the hydraulic oil detected by the pressure sensor to die. The number of rotations of the hydraulic pump is controlled so that the cushion pressure command value is obtained.
  • the control device controls the relief valve so that the set pressure of the relief valve is increased and the relief valve is closed. Controls the rotation speed of the hydraulic pump.
  • a die cushion device includes: The first hydraulic pump has a discharge side connected to a vent port of the relief valve, The pressure sensor detects a vent pressure of the relief valve, The control device includes: Controlling the rotation speed of the first hydraulic pump according to the vent pressure of the relief valve detected by the pressure sensor; The control device includes: When the vent pressure of the relief valve detected by the pressure sensor is equal to or higher than the predetermined pressure value, the first hydraulic pump is rotated in the reverse direction.
  • reverse rotation of the first hydraulic pump means to rotate the first hydraulic pump in a direction opposite to the direction in which the hydraulic oil is discharged.
  • the relief valve in die cushion pressure control during press forming of a press machine, when the pressure of hydraulic oil discharged from a hydraulic cylinder becomes equal to or higher than a set pressure of a relief valve, the relief valve operates and is discharged from the hydraulic cylinder. Return the operating oil to the oil tank.
  • the surge pressure pushes the valve body of the relief valve to move and compress the vent chamber, thereby increasing the vent pressure of the relief valve. I do.
  • the control device causes the first hydraulic pump to rotate in the reverse direction.
  • a second hydraulic pump having a discharge port connected to a vent port of the relief valve;
  • the pressure sensor detects a vent pressure of the relief valve
  • the control device includes: Controlling the rotation speed of the first hydraulic pump according to the vent pressure of the relief valve detected by the pressure sensor; Controlling the set pressure of the relief valve by controlling the vent pressure of the relief valve with the pressure of the hydraulic oil discharged from the second hydraulic pump; When the vent pressure of the relief valve detected by the pressure sensor exceeds the predetermined pressure value, the first hydraulic pump and the second hydraulic pump are rotated in reverse.
  • the hydraulic oil discharged from the hydraulic cylinder during the die cushion operation is returned to the oil tank via the second hydraulic pump rotated in the reverse direction, so that heat generation (oil temperature rise) at the relief valve is reduced. Can be avoided.
  • the first hydraulic pump and the second hydraulic pump are rotated in reverse, and the second hydraulic pressure that rotates in reverse is rotated.
  • the rotation speed of the second hydraulic pump is controlled such that the die cushion pressure of the hydraulic cylinder becomes a die cushion pressure command value.
  • the relief valve is set to a higher pressure than before the start of the reverse rotation to close the relief valve.
  • the rotation speed of the first hydraulic pump is controlled.
  • the control device when the vent pressure of the relief valve detected by the pressure sensor becomes equal to or greater than the predetermined pressure value, the control device causes the first hydraulic pump and the second hydraulic pump to rotate in reverse, thereby causing the hydraulic cylinder to rotate. Returning the hydraulic oil discharged from the hydraulic cylinder to the oil tank via the second hydraulic pump by controlling the rotation speed of the second hydraulic pump so that the die cushion pressure becomes the die cushion pressure command value. Can be.
  • the die cushion pressure of the hydraulic cylinder reaches the die cushion pressure command value after the start of reverse rotation of the first hydraulic pump, the number of rotations of the first hydraulic pump is controlled to start reverse rotation of the set pressure of the relief valve. Close the relief valve higher than before.
  • the control device includes: The set pressure of the relief valve is controlled by controlling the vent pressure of the relief valve with the pressure of the hydraulic oil discharged from the first hydraulic pump.
  • the first hydraulic pump When the vent pressure of the relief valve detected by the pressure sensor becomes equal to or higher than the predetermined pressure value, the first hydraulic pump is rotated in the reverse direction so that the hydraulic oil discharged from the hydraulic cylinder through the relief valve is discharged.
  • the rotation speed of the first hydraulic pump is controlled such that the die cushion pressure of the hydraulic cylinder becomes a die cushion pressure command value while returning to the oil tank.
  • the control device when the vent pressure of the relief valve detected by the pressure sensor becomes equal to or more than the predetermined pressure value, the control device causes the first hydraulic pump to rotate in the reverse direction to release the hydraulic oil discharged from the hydraulic cylinder.
  • the rotation speed of the first hydraulic pump can be controlled such that the die cushion pressure of the hydraulic cylinder becomes the die cushion pressure command value while returning to the oil tank via the valve.
  • An oil passage between the hydraulic cylinder and the first hydraulic pump and a connection point of the oil passage to which the relief valve is connected are disposed closer to the first hydraulic pump than the oil passage. 1 is provided with a check valve for restricting the flow of hydraulic oil to the hydraulic pump.
  • the check valve switches the hydraulic cylinder from the hydraulic cylinder to the first hydraulic pump.
  • the check valve By restricting the flow of the hydraulic oil, all of the hydraulic oil discharged from the hydraulic cylinder can be returned to the oil tank via the relief valve.
  • An electromagnetic valve is provided between the hydraulic cylinder and the first hydraulic pump, and an electromagnetic valve disposed closer to the first hydraulic pump than a connection point of the oil path where the relief valve is connected.
  • the solenoid valve is closed and the first hydraulic pressure is applied from the hydraulic cylinder.
  • the flow of hydraulic oil to the pump can be reliably stopped, and the vent pressure of the relief valve detected by the pressure sensor is stabilized, so that stable control can be performed.
  • a throttle connecting the connection point side and the pressure sensor detects the pressure of hydraulic oil which is the die cushion pressure of the said hydraulic cylinder,
  • the die cushion apparatus characterized by the above-mentioned.
  • the effect of a rapid pressure change on die cushion pressure control is caused by the effect of a throttle connected to both ends of a check valve. Can be avoided and control stability can be ensured.
  • FIG. 1 is a schematic block diagram of a die cushion device according to a first embodiment of the present disclosure. It is a graph which shows operation of the above-mentioned die cushion device. It is a schematic block diagram of a die cushion device of a second embodiment of the present disclosure. It is a graph which shows operation of the above-mentioned die cushion device. It is a schematic block diagram of a die cushion device of a third embodiment of the present disclosure. It is a graph which shows operation of a die cushion device of a 3rd embodiment. It is a schematic block diagram of a die cushion device of a fourth embodiment of the present disclosure. It is a graph which shows operation of a die cushion device of a 4th embodiment.
  • FIG. 1 is a schematic block diagram of the die cushion device according to the first embodiment of the present disclosure.
  • the die cushion device includes a hydraulic cylinder 10 that moves a cushion pad 14 up and down, a hydraulic pump P that supplies hydraulic oil from a hydraulic tank T to the hydraulic cylinder 10, A motor M for driving the pump P, a relief valve 20 for returning hydraulic oil discharged from the hydraulic cylinder 10 to the oil tank T, a pressure sensor PS for detecting a pressure of the hydraulic oil as a die cushion pressure of the hydraulic cylinder 10, A check valve 30 that regulates the flow of hydraulic oil from the hydraulic cylinder 10 to the hydraulic pump P, and a control device 40 that controls the flow rate and pressure of hydraulic oil supplied from the hydraulic pump P to the hydraulic cylinder 10 are provided.
  • the hydraulic pump P is an example of a first hydraulic pump.
  • the hydraulic cylinder 10 includes a cylinder tube 11, a piston 12 reciprocating in the cylinder tube 11, and a piston rod 13 having one end connected to the piston 12.
  • a cushion pad 14 is connected to the other end of the piston rod 13 of the hydraulic cylinder 10.
  • the cushion pad 14 is supported by the hydraulic cylinder 10.
  • the cushion pad 14 is provided with a position sensor (not shown) for detecting the position of the cushion pad 14.
  • a position signal indicating the position of the cushion pad 14 is output from the position sensor to the control device 40.
  • the check valve 30 is disposed closer to the hydraulic pump P than the connection point of the flow path between the hydraulic cylinder 10 and the hydraulic pump P to which the relief valve 20 is connected.
  • the port 10 a of the hydraulic cylinder 10 is connected to the discharge side of the hydraulic pump P via a check valve 30.
  • the pressure sensor PS is connected to the port 10a of the hydraulic cylinder 10. A pressure signal is output from the pressure sensor PS to the control device 40.
  • the port 10a of the hydraulic cylinder 10 is connected to the inlet port 21 of the relief valve 20, and the outlet port 22 of the relief valve 20 is connected to the oil tank T.
  • the relief valve 20 is a pilot-operated relief valve, and connects the discharge side of the hydraulic pump P to a vent port 23 (pilot port) of the relief valve 20. Thereby, the discharge pressure (pilot pressure) of the hydraulic pump P is supplied to the vent port 23 of the relief valve 20, and the set pressure Pp of the relief valve 20 is controlled.
  • the control device 40 receives a die cushion pressure command signal representing a die cushion pressure command value, a position signal representing the position of the cushion pad 14, and a pressure signal from the pressure sensor PS, and outputs a drive signal for driving the motor M. Thereby, the rotation speed of the hydraulic pump P is controlled.
  • the die cushion pressure command signal is input from a main machine controller (not shown) of the press machine.
  • FIG. 2 shows the operation of the die cushion device.
  • the pressure of the hydraulic oil detected by the pressure sensor PS by the control device 40 is set to the die cushion pressure command value.
  • the rotation speed of the hydraulic pump P is controlled to keep the flow rate of the hydraulic pump P constant, and the pressure at the vent port 23 is set to a pressure corresponding to the die cushion pressure command value.
  • the surge pressure is superimposed on the die cushion pressure, and when the die cushion pressure at the port 10a of the hydraulic cylinder 10 becomes equal to or higher than the set pressure Pp of the relief valve 20, the relief valve 20 operates.
  • the operating oil discharged from the hydraulic cylinder 10 is returned to the oil tank T via the relief valve 20.
  • the pressure of the hydraulic oil detected by the pressure sensor PS becomes equal to or higher than the set pressure Pp of the relief valve 20, and the control device 40 rotates the hydraulic pump P in the reverse direction.
  • control device 40 controls the rotation speed of the hydraulic pump P so that the pressure of the hydraulic oil detected by the pressure sensor PS returns to the die cushion pressure command value.
  • the control device 40 controls the hydraulic pump P according to the pressure of the operating oil detected by the pressure sensor PS (corresponding to the die cushion pressure). By controlling the number of rotations, the flow rate and pressure of the hydraulic oil supplied from the hydraulic pump P to the hydraulic cylinder 10 are controlled.
  • the relief valve 20 In controlling the die cushion pressure of the press machine, when a surge pressure is generated in the hydraulic cylinder 10 during press forming and the die cushion pressure at the port 10a of the hydraulic cylinder 10 becomes equal to or higher than the set pressure Pp of the relief valve 20, the relief valve 20 When the operating oil discharged from the hydraulic cylinder 10 operates and returns to the oil tank T, and the pressure of the operating oil detected by the pressure sensor PS becomes equal to or higher than the set pressure Pp of the relief valve 20, the hydraulic pump P is controlled by the control device 40. To reverse rotation. The surge pressure generated from the hydraulic cylinder 10 can be suppressed by performing the die cushion pressure control by the hydraulic pump P with high accuracy and high speed.
  • the set pressure Pp of the vent port 23 of the pilot-operated relief valve 20 is directly controlled by the hydraulic pump P, as compared with the balance piston type relief valve having a slow response. No operation delay occurs, and the surge pressure can be reliably suppressed.
  • FIG. 3 is a schematic block diagram of a die cushion device according to a second embodiment of the present disclosure. 3, the same components as those in FIG. 1 are denoted by the same reference numerals.
  • the die cushion device includes a hydraulic cylinder 10 for moving the cushion pad 14 up and down, a hydraulic pump P1 for supplying hydraulic oil from the oil tank to the hydraulic cylinder 10, and a hydraulic pump P1.
  • a motor M1 for driving P1 a relief valve 20 for returning hydraulic oil discharged from the hydraulic cylinder 10 to the oil tank T, a pressure sensor PS for detecting a hydraulic oil pressure, which is a die cushion pressure of the hydraulic cylinder 10,
  • a control device 140 is provided for controlling the flow rate and pressure of hydraulic oil supplied from the pump P1 to the hydraulic cylinder 10.
  • the hydraulic pump P1 is an example of a first hydraulic pump.
  • the die cushion device includes a hydraulic pump P2 for controlling the set pressure Pp of the relief valve 20, and a motor M2 for driving the hydraulic pump P2.
  • the hydraulic pump P2 is an example of a second hydraulic pump, and has a smaller capacity than the hydraulic pump P1.
  • the port 10a of the hydraulic cylinder 10 is connected to the discharge side of the hydraulic pump P1.
  • the pressure sensor PS is connected to the port 10a of the hydraulic cylinder 10.
  • a pressure signal is output from pressure sensor PS to control device 140.
  • a position sensor (not shown) is provided on the cushion pad 14 supported by the hydraulic cylinder 10, and a position signal indicating the position of the cushion pad 14 is output from the position sensor to the control device 40.
  • the port 10a of the hydraulic cylinder 10 is connected to the inlet port 21 of the relief valve 20, and the outlet port 22 of the relief valve 20 is connected to the oil tank T.
  • the relief valve 20 is a pilot-operated relief valve, and connects the discharge side of the hydraulic pump P ⁇ b> 2 to the vent port 23 of the relief valve 20. As a result, the discharge pressure (pilot pressure) of the hydraulic pump P2 is supplied to the vent port 23 of the relief valve 20, and the set pressure Pp of the relief valve 20 is controlled.
  • Control device 140 receives a die cushion pressure command signal representing a die cushion pressure command value, a position signal representing the position of cushion pad 14, and a pressure signal from pressure sensor PS, and outputs a drive signal for driving motors M1 and M2. Thus, the rotational speeds of the hydraulic pumps P1 and P2 are controlled respectively.
  • the die cushion pressure command signal is input from a main machine controller (not shown) of the press machine.
  • FIG. 4 shows the operation of the die cushion device.
  • the pressure of the hydraulic oil detected by the pressure sensor PS by the control device 140 is set to the die cushion pressure command value.
  • the number of revolutions of the hydraulic pump P1 is controlled to keep the flow rate of the hydraulic pump P1 constant.
  • the control device 40 controls the rotation speed of the hydraulic pump P2 so that the set pressure Pp of the vent port 23 of the relief valve 20 becomes a pressure corresponding to the die cushion pressure command value.
  • the surge pressure is superimposed on the die cushion pressure.
  • the operating oil discharged from the hydraulic cylinder 10 is returned to the oil tank T via the relief valve 20.
  • the pressure of the hydraulic oil detected by the pressure sensor PS becomes equal to or higher than the die cushion pressure command value, and the control device 140 rotates the hydraulic pump P1 in the reverse direction.
  • control device 140 controls the hydraulic pump P1 to an appropriate rotation speed so that the pressure of the hydraulic oil detected by the pressure sensor PS returns to the die cushion pressure command value. Further, the control device 140 controls the number of revolutions of the hydraulic pump P2 so that the set pressure Pp of the relief valve 20 becomes higher than the pressure immediately before the external force is generated during the die cushion operation. , The relief valve 20 is closed.
  • the control device 140 increases the rotation speed of the hydraulic pump P1 according to the pressure of the operating oil detected by the pressure sensor PS (corresponding to the die cushion pressure). By controlling, the flow rate and pressure of the hydraulic oil supplied from the hydraulic pump P1 to the hydraulic cylinder 10 are controlled.
  • the relief valve 20 In controlling the die cushion pressure of the press machine, when a surge pressure is generated in the hydraulic cylinder 10 during press forming and the die cushion pressure at the port 10a of the hydraulic cylinder 10 becomes equal to or higher than the set pressure Pp of the relief valve 20, the relief valve 20 When the operating oil discharged from the hydraulic cylinder 10 is returned to the oil tank T and the pressure of the operating oil detected by the pressure sensor PS becomes equal to or higher than the set pressure Pp of the relief valve 20, the hydraulic pump P1 is controlled by the control device 140. To reverse rotation. The surge pressure generated from the hydraulic cylinder 10 can be suppressed by performing the die cushion pressure control by the hydraulic pump P1 with high accuracy and high speed.
  • the set pressure Pp of the vent port 23 of the pilot-operated relief valve 20 is directly controlled by the hydraulic pump P2, as compared with the balance piston type relief valve having a slow response. No operation delay occurs, and the surge pressure can be reliably suppressed.
  • the hydraulic oil discharged from the hydraulic cylinder 10 during the die cushion operation is returned to the oil tank T via the reversely rotated hydraulic pump P1, so that heat generation at the relief valve 20 (oil temperature). Rise) can be avoided.
  • the motor M1 rotates in the reverse direction by the hydraulic pump P1 rotating in the reverse direction, and the electric energy generated by the motor M1 is consumed by the regenerative resistor.
  • the cylinder diameter becomes large and the device becomes large, and it is difficult to adjust the pressure and precisely control the position because it uses the pressure of air with compressibility.
  • FIG. 5 is a schematic block diagram of a die cushion device according to a third embodiment of the present disclosure.
  • the die cushion device includes a hydraulic cylinder 10 for vertically moving a cushion pad 14 of a press machine (not shown), and hydraulic fluid from an oil tank T to the hydraulic cylinder 10.
  • a hydraulic pump P to be supplied a motor M for driving the hydraulic pump P, a relief valve 20 for returning hydraulic oil discharged from the hydraulic cylinder 10 to the oil tank T, and a flow of hydraulic oil from the hydraulic cylinder 10 to the hydraulic pump P
  • Check valve 30, a pressure sensor PS for detecting the vent pressure of the relief valve 20, and a control device 240 for controlling the flow rate and pressure of hydraulic oil supplied from the hydraulic pump P to the hydraulic cylinder 10.
  • the hydraulic pump P is an example of a first hydraulic pump.
  • the hydraulic cylinder 10 includes a cylinder tube 11, a piston 12 reciprocating in the cylinder tube 11, and a piston rod 13 having one end connected to the piston 12.
  • a cushion pad 14 is connected to the other end of the piston rod 13 of the hydraulic cylinder 10.
  • the cushion pad 14 is supported by the hydraulic cylinder 10.
  • the cushion pad 14 is provided with a position sensor (not shown) for detecting the position of the cushion pad 14.
  • a position signal indicating the position of the cushion pad 14 is output from the position sensor to the control device 240.
  • the check valve 30 is disposed on the oil pump between the hydraulic cylinder 10 and the hydraulic pump P and closer to the hydraulic pump P than the connection point of the oil passage where the relief valve 20 is connected.
  • the port 10 a of the hydraulic cylinder 10 is connected to the discharge side of the hydraulic pump P via a check valve 30.
  • a pressure sensor PS is connected between the discharge side of the hydraulic pump P and the check valve 30.
  • a pressure signal indicating the vent pressure of the relief valve 20 is output from the pressure sensor PS to the control device 240.
  • the port 10a of the hydraulic cylinder 10 is connected to the inlet port 21 of the relief valve 20, and the outlet port 22 of the relief valve 20 is connected to the oil tank T.
  • the relief valve 20 is a pilot-operated relief valve, and connects the discharge side of the hydraulic pump P to a vent port 23 of the relief valve 20. Thereby, the discharge pressure of the hydraulic pump P is supplied to the vent port 23 of the relief valve 20, and the set pressure Pset of the relief valve 20 is controlled.
  • Control device 240 receives a die cushion pressure command signal representing a die cushion pressure command value, a position signal representing the position of cushion pad 14, and a pressure signal from pressure sensor PS, and outputs a drive signal for driving motor M. Thereby, the rotation speed of the hydraulic pump P is controlled.
  • the die cushion pressure command signal is input from a main machine controller (not shown) of the press machine.
  • FIG. 6 shows the operation of the die cushion device.
  • the horizontal axis is time [arbitrary scale]
  • the vertical axis is pressure [arbitrary scale] and flow rate [arbitrary scale].
  • the control device 240 controls the relief valve 20 detected by the pressure sensor PS.
  • the rotational speed of the hydraulic pump P is controlled such that the die cushion pressure of the hydraulic cylinder 10 becomes the die cushion pressure command value based on the vent pressure of the hydraulic pump P.
  • the rotation speed of the hydraulic pump P is controlled by the control device 240 such that the pressure at the vent port 23 of the relief valve 20 becomes the set vent pressure Pv.
  • the relief valve 20 operates to return the hydraulic oil discharged from the hydraulic cylinder 10 to the oil tank T via the relief valve 20.
  • the control device 240 rotates the hydraulic pump P in the reverse direction.
  • the predetermined pressure value Pv is the same as the set vent pressure Pv, but the predetermined pressure value Pv may be larger than the set vent pressure.
  • the cushion pad 14 is pushed down at a predetermined speed by sliding, and the control device 240 controls the rotation speed of the hydraulic pump P so that the vent pressure detected by the pressure sensor PS returns to the set vent pressure Pv.
  • the control device 240 controls the number of rotations of the hydraulic pump P according to the vent pressure detected by the pressure sensor PS during press forming of the press machine. The flow rate and pressure of the hydraulic oil supplied from P to the hydraulic cylinder 10 are controlled.
  • the relief valve 20 operates to return the hydraulic oil discharged from the hydraulic cylinder 10 to the oil tank T, and when the vent pressure of the relief valve 20 detected by the pressure sensor PS becomes equal to or higher than a predetermined pressure value Pv, the control device 240 controls the hydraulic pump. Reverse P.
  • the surge pressure generated from the hydraulic cylinder 10 can be suppressed by performing the die cushion pressure control by the hydraulic pump P with high accuracy and high speed.
  • the vent pressure of the pilot-actuated relief valve 20 is directly controlled by the hydraulic pump P, compared to a balance piston-type relief valve having a slow response, so that the operation delay of the relief valve 20 occurs. Without doing so, the surge pressure can be reliably suppressed.
  • the control device 240 causes the hydraulic pump P to rotate in the reverse direction so that the die cushion pressure of the hydraulic cylinder 10 becomes the die cushion pressure.
  • the hydraulic oil discharged from the hydraulic cylinder 10 can be returned to the oil tank T via the relief valve 20.
  • FIG. 7 is a schematic block diagram of a die cushion device according to a fourth embodiment of the present disclosure.
  • the die cushion device of the fourth embodiment has the same configuration as the die cushion device of the third embodiment except for the solenoid valve 50 and the control device 340.
  • the die cushion device according to the fourth embodiment is configured such that the oil passage between the hydraulic cylinder 10 and the hydraulic pump P and the connection point of the oil passage on which the relief valve 20 is connected are closer to the hydraulic pump P side.
  • the solenoid valve 50 is disposed.
  • FIG. 8 shows the operation of the die cushion device.
  • the horizontal axis is time [arbitrary scale]
  • the vertical axis is pressure [arbitrary scale] and flow rate [arbitrary scale].
  • the control device 340 controls the hydraulic cylinder 10 based on the vent pressure of the relief valve 20 detected by the pressure sensor PS.
  • the rotational speed of the hydraulic pump P is controlled so that the die cushion pressure becomes the die cushion pressure command value.
  • the control device 340 controls the rotation speed of the hydraulic pump P so that the pressure at the vent port 23 of the relief valve 20 becomes the set vent pressure Pv.
  • the surge pressure is superimposed on the die cushion pressure.
  • the operating oil discharged from the hydraulic cylinder 10 is returned to the oil tank T via the relief valve 20.
  • the vent pressure of the relief valve 20 detected by the pressure sensor PS becomes equal to or higher than the predetermined pressure value Pv, the hydraulic pump P is rotated in the reverse direction.
  • the cushion pad 14 is pushed down at a predetermined speed by sliding, and the control device 340 controls the rotation speed of the hydraulic pump P so that the vent pressure detected by the pressure sensor PS returns to the set vent pressure Pv.
  • the die cushion device of the fourth embodiment has the same effects as the die cushion device of the third embodiment.
  • the die cushion device according to the fourth embodiment is different from the die cushion device including the check valve 30 according to the third embodiment in that the hydraulic pump P and the hydraulic cylinder 10 are connected to each other even when pressure overshoot or undershoot occurs. By reliably blocking the oil passage between the two, stable control is possible.
  • FIG. 9 is a schematic block diagram of a die cushion device according to a fifth embodiment of the present disclosure. 9, the same components as those of FIG. 5 are denoted by the same reference numerals.
  • the die cushion device drives a hydraulic cylinder 10 for moving the cushion pad 14 up and down, a hydraulic pump P2 for controlling a set pressure Pset of the relief valve 20, and a hydraulic pump P2.
  • M2 a hydraulic pump P1 for supplying hydraulic oil from the oil tank T to the hydraulic cylinder 10, a motor M1 for driving the hydraulic pump P1, and a relief for returning hydraulic oil discharged from the hydraulic cylinder 10 to the oil tank T.
  • a control device 440 for controlling the number of rotations of P1 and P2.
  • the controller 440 controls the flow rate and pressure of the hydraulic oil supplied to the vent port 23 of the relief valve 20 by controlling the rotation speed of the hydraulic pump P2.
  • the control device 440 controls the rotation speed of the hydraulic pump P1 to control the flow rate and pressure of the hydraulic oil supplied from the hydraulic pump P1 to the hydraulic cylinder 10.
  • the hydraulic pump P2 is an example of a second hydraulic pump.
  • the hydraulic pump P1 is an example of a first hydraulic pump.
  • the hydraulic pump P2 has a smaller capacity than the hydraulic pump P1.
  • the pressure sensor PS2 is connected to the vent port 23 of the relief valve 20.
  • a second pressure signal representing the vent pressure of the relief valve 20 is output from the pressure sensor PS2 to the control device 440.
  • the port 10a of the hydraulic cylinder 10 is connected to the discharge side of the hydraulic pump P1.
  • the pressure sensor PS1 is connected to the port 10a of the hydraulic cylinder 10.
  • the pressure sensor PS1 outputs a first pressure signal representing the die cushion pressure to the control device 440.
  • a position sensor (not shown) is provided on the cushion pad 14 supported by the hydraulic cylinder 10, and a position signal indicating the position of the cushion pad 14 is output from the position sensor to the control device 440.
  • the port 10a of the hydraulic cylinder 10 is connected to the inlet port 21 of the relief valve 20, and the outlet port 22 of the relief valve 20 is connected to the oil tank T.
  • the relief valve 20 is a pilot-operated relief valve, and connects the discharge side of the hydraulic pump P ⁇ b> 2 to the vent port 23 of the relief valve 20. Thereby, the discharge pressure of the hydraulic pump P2 is supplied to the vent port 23 of the relief valve 20, and the set pressure Pset of the relief valve 20 is controlled.
  • the control device 440 receives the die cushion pressure command signal representing the die cushion pressure command value, the position signal representing the position of the cushion pad 14, and the first and second pressure signals from the pressure sensors PS1, PS2, and receives the motors M1, M2. By outputting first and second drive signals for driving the motors, the rotational speeds of the hydraulic pumps P1 and P2 are controlled respectively.
  • the die cushion pressure command signal is input from a main machine controller (not shown) of the press machine.
  • FIG. 10 shows the operation of the die cushion device.
  • the horizontal axis is time [arbitrary scale]
  • the vertical axis is pressure [arbitrary scale] and flow rate [arbitrary scale].
  • the pressure of the hydraulic oil detected by the pressure sensor PS1 by the control device 440 is set to the die cushion pressure command value. And controls the rotation speed of the hydraulic pump P1.
  • the control device 440 controls the rotation speed of the hydraulic pump P2 so that the pressure at the vent port 23 of the relief valve 20 becomes the set vent pressure Pv1.
  • the hydraulic pump P1 rotates in the reverse direction, and the hydraulic oil discharged from the hydraulic cylinder 10 is discharged through the hydraulic pump P1.
  • the predetermined pressure value Pv1 is the same as the set vent pressure Pv1, but the predetermined pressure value Pv1 may be larger than the set vent pressure.
  • the cushion pad 14 is pushed down at a predetermined speed by sliding, and the control device 440 sets the hydraulic pump P1 to an appropriate rotation speed such that the pressure of the hydraulic oil detected by the pressure sensor PS1 returns to the die cushion pressure command value. Control.
  • the control device 440 controls the rotation speed of the hydraulic pump P2 to increase the pressure of the vent port 23 of the relief valve 20 to a set vent pressure Pv2 higher than the set vent pressure Pv1 immediately before an external force is generated during the die cushion operation.
  • the relief valve 20 is closed by changing the discharge pressure of the hydraulic pump P2 so that
  • the rotation of the hydraulic pump P1 is controlled by the control device 440 according to the vent pressure of the relief valve 20 (corresponding to the die cushion pressure) detected by the pressure sensor PS2 during press forming of the press machine.
  • the number By controlling the number, the flow rate and the pressure of the hydraulic oil supplied from the hydraulic pump P1 to the hydraulic cylinder 10 are controlled.
  • the relief valve 20 In controlling the die cushion pressure of the press machine, when a surge pressure is generated in the hydraulic cylinder 10 during press forming and the die cushion pressure at the port 10a of the hydraulic cylinder 10 becomes equal to or higher than the set pressure Pset of the relief valve 20, the relief valve 20 is activated.
  • the operating oil discharged from the hydraulic cylinder 10 by operating is returned to the oil tank T, and the vent pressure of the relief valve 20 detected by the pressure sensor PS2 becomes equal to or higher than a predetermined pressure value Pv1, or is detected by the pressure sensor PS1. Since the pressure of the hydraulic oil thus applied exceeds the die cushion pressure command value, the control device 440 causes the hydraulic pump P1 to rotate in the reverse direction.
  • the surge pressure generated from the hydraulic cylinder 10 can be suppressed by performing the die cushion pressure control by the hydraulic pump P1 with high accuracy and high speed.
  • the pressure of the pilot-operated relief valve 20 is directly controlled by the hydraulic pump P2 as compared with the balance piston-type relief valve which has a slow response, so that the operation delay of the relief valve 20 occurs. Therefore, the surge pressure can be reliably suppressed.
  • the hydraulic oil discharged from the hydraulic cylinder 10 during the die cushion operation is returned to the oil tank T via the reversely rotated hydraulic pump P1, so that heat generation at the relief valve 20 (oil temperature). Rise) can be avoided.
  • the motor M1 rotates in the reverse direction by the hydraulic pump P1 rotating in the reverse direction, and the electric energy generated by the motor M1 is consumed by the regenerative resistor.
  • the cylinder diameter becomes large and the device becomes large, and it is difficult to adjust the pressure and precisely control the position because it uses the pressure of air with compressibility.
  • the third to fifth embodiments can solve these problems.
  • the control device 440 causes the hydraulic pump P1 and the hydraulic pump P2 to rotate in reverse, so that the die cushion pressure of the hydraulic cylinder 10 is reduced.
  • the hydraulic oil discharged from the hydraulic cylinder 10 can be returned to the oil tank T via the hydraulic pump P1.
  • the number of rotations of the hydraulic pump P2 is controlled so that the set pressure of the relief valve 20 becomes the value before the start of the reverse rotation.
  • the relief valve 20 is closed by raising the set vent pressure Pv2 to be higher than the set vent pressure Pv1.
  • FIG. 11 is a schematic block diagram of a die cushion device according to a sixth embodiment of the present disclosure.
  • the die cushion device according to the sixth embodiment has the same configuration as the die cushion device according to the third embodiment except for the operations of the diaphragm 60 and the control device 540.
  • the throttles 60 are connected to both ends of the check valve 30 as shown in FIG.
  • FIG. 12 shows the operation of the die cushion device.
  • the horizontal axis is time [arbitrary scale]
  • the vertical axis is pressure [arbitrary scale] and flow rate [arbitrary scale].
  • the control device 540 controls the hydraulic oil detected by the pressure sensor PS. Based on the pressure, the rotation speed of the hydraulic pump P is controlled so that the die cushion pressure of the hydraulic cylinder 10 becomes the die cushion pressure command value. At this time, the control device 540 controls the rotation speed of the hydraulic pump P so that the pressure at the vent port 23 of the relief valve 20 becomes the set vent pressure Pv.
  • the relief valve 20 operates to return the hydraulic oil discharged from the hydraulic cylinder 10 to the oil tank T via the relief valve 20.
  • the cushion pad 14 is pushed down at a predetermined speed by sliding, and the control device 540 controls the rotation speed of the hydraulic pump P such that the pressure detected by the pressure sensor PS returns to the set vent pressure Pv.
  • the die cushion pressure of the hydraulic cylinder 10 is slightly higher than immediately before the surge pressure is generated due to the influence of the passage pressure loss and the flow-pressure characteristic of the relief valve 20, and the hydraulic cylinder pressure is lower than that of the third embodiment.
  • the die cushion pressure of 10 gradually approaches the die cushion pressure command value.
  • a surge pressure is generated in the hydraulic cylinder 10 during press forming, and the die cushion pressure of the port 10 a of the hydraulic cylinder 10 is reduced by the relief valve 20.
  • the relief valve 20 operates to return the hydraulic oil discharged from the hydraulic cylinder 10 to the oil tank T, and the surge pressure detected by the pressure sensor PS via the throttle 60 to a predetermined pressure value.
  • the control device 540 causes the hydraulic pump P to rotate in the reverse direction.
  • the die cushion device of the sixth embodiment is connected to both ends of the check valve 30 in a transition period when a surge pressure is generated in the hydraulic cylinder 10 in die cushion pressure control. Due to the effect of the throttle 60, the influence of a sudden pressure change on the die cushion pressure control can be avoided, and the stability of the control can be ensured.
  • check valve 30 is used in the sixth embodiment, an electromagnetic valve may be used instead of the check valve as in the fourth embodiment.
  • the die cushion device provided with one hydraulic cylinder 10 for moving the cushion pad 14 up and down has been described.
  • the die cushion device provided with a plurality of hydraulic cylinders for moving the cushion pad up and down has been described.
  • the invention may be applied.
  • Die cushion device of the present disclosure A hydraulic cylinder that moves the cushion pad up and down, A hydraulic pump for supplying hydraulic oil from an oil tank to the hydraulic cylinder, A relief valve for returning hydraulic oil discharged from the hydraulic cylinder to the oil tank; A pressure sensor for detecting a pressure of hydraulic oil, which is a die cushion pressure of the hydraulic cylinder, A control device that controls a flow rate and a pressure of hydraulic oil supplied from the hydraulic pump to the hydraulic cylinder by controlling a rotation speed of the hydraulic pump in accordance with a pressure of the hydraulic oil detected by the pressure sensor.
  • the control device includes: While controlling the rotation speed of the hydraulic pump, so that the pressure of the hydraulic oil detected by the pressure sensor becomes a die cushion pressure command value, When the pressure of the hydraulic oil detected by the pressure sensor is equal to or higher than the set pressure of the relief valve, the hydraulic pump is rotated in the reverse direction.
  • the control device controls the number of rotations of the hydraulic pump in accordance with the pressure of the operating oil detected by the pressure sensor (corresponding to the die cushion pressure), whereby the hydraulic pump Controls the flow rate and pressure of hydraulic oil supplied from the hydraulic cylinder to the hydraulic cylinder.
  • the pressure of hydraulic oil which is the die cushion pressure of the hydraulic cylinder, becomes equal to or higher than a set pressure of a relief valve, a relief valve is formed.
  • the control device Operates to return the hydraulic oil discharged from the hydraulic cylinder to the oil tank, and when the pressure of the hydraulic oil detected by the pressure sensor becomes equal to or higher than the set pressure of the relief valve, the control device causes the hydraulic pump to rotate in the reverse direction.
  • a flow path between the hydraulic cylinder and the hydraulic pump is disposed closer to the hydraulic pump than a connection point where the relief valve is connected, and regulates a flow of hydraulic oil from the hydraulic cylinder to the hydraulic pump. Equipped with a check valve, The set pressure of the relief valve is controlled by the pressure of the hydraulic oil discharged from the hydraulic pump, When the pressure of the hydraulic oil detected by the pressure sensor is equal to or higher than a set pressure of the relief valve, the control device rotates the hydraulic pump in the reverse direction to open the relief valve.
  • the control device when the pressure of the hydraulic oil detected by the pressure sensor is equal to or higher than the set pressure of the relief valve, the control device causes the hydraulic pump to rotate in the reverse direction. At this time, the relief valve operates to return the hydraulic oil discharged from the hydraulic cylinder to the oil tank.
  • a relief valve hydraulic pump for controlling the set pressure of the relief valve includes: When the pressure of the hydraulic oil detected by the pressure sensor becomes equal to or higher than the set pressure of the relief valve, the hydraulic pump is rotated in the reverse direction so that the pressure of the hydraulic oil detected by the pressure sensor becomes the die cushion pressure command value. So as to control the rotation speed of the hydraulic pump, When the pressure of the hydraulic oil detected by the pressure sensor reaches the die cushion pressure command value after the start of reverse rotation of the hydraulic pump, the relief valve is configured to increase the set pressure of the relief valve and close the relief valve. Control the rotation speed of the hydraulic pump.
  • the control device when the pressure of the hydraulic oil detected by the pressure sensor becomes equal to or higher than the set pressure of the relief valve, the control device causes the hydraulic pump to rotate in the reverse direction so that the pressure of the hydraulic oil detected by the pressure sensor is reduced. The number of rotations of the hydraulic pump is controlled so that the die cushion pressure command value is obtained.
  • the control device controls the relief valve so that the set pressure of the relief valve is increased and the relief valve is closed. Controls the rotation speed of the hydraulic pump.
  • Die cushion device of the present disclosure A hydraulic cylinder that moves the cushion pad up and down, A relief valve for returning hydraulic oil discharged from the hydraulic cylinder to an oil tank, A first hydraulic pump having a discharge side connected to a vent port of the relief valve; A pressure sensor for detecting a vent pressure of the relief valve, A control device for controlling the number of revolutions of the first hydraulic pump according to the vent pressure of the relief valve detected by the pressure sensor, The control device includes: When the vent pressure of the relief valve detected by the pressure sensor is equal to or higher than a predetermined pressure value, the first hydraulic pump is rotated in the reverse direction.
  • reverse rotation of the first hydraulic pump means to rotate the first hydraulic pump in a direction opposite to the direction in which the hydraulic oil is discharged.
  • the relief valve in die cushion pressure control during press forming of a press machine, when the pressure of hydraulic oil discharged from a hydraulic cylinder becomes equal to or higher than a set pressure of a relief valve, the relief valve operates and is discharged from the hydraulic cylinder. Return the operating oil to the oil tank.
  • the surge pressure pushes the valve body of the relief valve to move and compress the vent chamber, thereby increasing the vent pressure of the relief valve. I do.
  • the control device causes the first hydraulic pump to rotate in the reverse direction.
  • a second hydraulic pump that supplies hydraulic oil from the oil tank to the hydraulic cylinder includes: Controlling the set pressure of the relief valve by controlling the vent pressure of the relief valve with the pressure of the hydraulic oil discharged from the first hydraulic pump; When the vent pressure of the relief valve detected by the pressure sensor becomes equal to or higher than the predetermined pressure value, the second hydraulic pump is rotated in reverse.
  • the hydraulic oil discharged from the hydraulic cylinder during the die cushion operation is returned to the oil tank via the second hydraulic pump rotated in the reverse direction, so that heat generation (oil temperature rise) at the relief valve is reduced. Can be avoided.
  • the first hydraulic pump and the second hydraulic pump are rotated in reverse, and the second hydraulic pressure that rotates in reverse is rotated.
  • the rotation speed of the second hydraulic pump is controlled such that the die cushion pressure of the hydraulic cylinder becomes a die cushion pressure command value.
  • the relief valve is set to a higher pressure than before the start of the reverse rotation to close the relief valve.
  • the rotation speed of the first hydraulic pump is controlled.
  • the control device when the vent pressure of the relief valve detected by the pressure sensor becomes equal to or higher than the predetermined pressure value, the control device causes the first hydraulic pump and the second hydraulic pump to rotate in reverse, thereby causing the hydraulic cylinder to rotate. Returning the hydraulic oil discharged from the hydraulic cylinder to the oil tank via the second hydraulic pump by controlling the rotation speed of the second hydraulic pump so that the die cushion pressure becomes the die cushion pressure command value. Can be.
  • the die cushion pressure of the hydraulic cylinder reaches the die cushion pressure command value after the start of reverse rotation of the first hydraulic pump, the number of rotations of the first hydraulic pump is controlled to start reverse rotation of the set pressure of the relief valve. Close the relief valve higher than before.
  • the control device includes: The set pressure of the relief valve is controlled by controlling the vent pressure of the relief valve with the pressure of the hydraulic oil discharged from the first hydraulic pump.
  • the first hydraulic pump When the vent pressure of the relief valve detected by the pressure sensor becomes equal to or higher than the predetermined pressure value, the first hydraulic pump is rotated in the reverse direction so that the hydraulic oil discharged from the hydraulic cylinder through the relief valve is discharged.
  • the rotation speed of the first hydraulic pump is controlled such that the die cushion pressure of the hydraulic cylinder becomes a die cushion pressure command value while returning to the oil tank.
  • the control device when the vent pressure of the relief valve detected by the pressure sensor becomes equal to or more than the predetermined pressure value, the control device causes the first hydraulic pump to rotate in the reverse direction to release the hydraulic oil discharged from the hydraulic cylinder.
  • the rotation speed of the first hydraulic pump can be controlled such that the die cushion pressure of the hydraulic cylinder becomes the die cushion pressure command value while returning to the oil tank via the valve.
  • An oil passage between the hydraulic cylinder and the first hydraulic pump and a connection point of the oil passage to which the relief valve is connected are disposed closer to the first hydraulic pump than the oil passage. 1 is provided with a check valve for restricting the flow of hydraulic oil to the hydraulic pump.
  • the check valve switches the hydraulic cylinder from the hydraulic cylinder to the first hydraulic pump.
  • the check valve By restricting the flow of the hydraulic oil, all of the hydraulic oil discharged from the hydraulic cylinder can be returned to the oil tank via the relief valve.
  • An electromagnetic valve is provided between the hydraulic cylinder and the first hydraulic pump, and an electromagnetic valve disposed closer to the first hydraulic pump than a connection point of the oil path where the relief valve is connected.
  • the solenoid valve is closed and the first hydraulic pressure is applied from the hydraulic cylinder.
  • the flow of hydraulic oil to the pump can be reliably stopped, and the vent pressure of the relief valve detected by the pressure sensor is stabilized, so that stable control can be performed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Presses And Accessory Devices Thereof (AREA)

Abstract

Un coussin comprend : un cylindre hydraulique (10) pour déplacer un bloc coussin (14) vers le haut et vers le bas; une pompe hydraulique (P) pour fournir l'huile hydraulique au vérin hydraulique (10) à partir d'un réservoir d'huile (T); une soupape de surpression (20) pour renvoyer l'huile hydraulique évacuée du cylindre hydraulique (10) au réservoir d'huile; un capteur de pression (PS) pour détecter la pression de l'huile hydraulique, qui est la pression du coussin du cylindre hydraulique (10); et un dispositif de commande (40) pour commander le débit et la pression de l'huile hydraulique fournie au vérin hydraulique (10) par la pompe hydraulique (P). Le dispositif de commande (40) commande la fréquence de rotation de la pompe hydraulique (P) de sorte que la pression de l'huile hydraulique telle que détectée par le capteur de pression (PS) atteint une valeur de commande de pression de coussin, et amène la pompe hydraulique (P) à tourner en sens inverse lorsque la pression de l'huile hydraulique telle que détectée par le capteur de pression (PS) est égale ou supérieure à une pression de consigne de la soupape de surpression (20).
PCT/JP2019/033114 2018-08-31 2019-08-23 Coussin WO2020045300A1 (fr)

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CN112140613B (zh) * 2020-08-14 2022-07-26 中国船舶重工集团公司第七0四研究所 一种超高压小型油压机系统
JP7436892B2 (ja) 2022-07-21 2024-02-22 ダイキン工業株式会社 油圧装置

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JP2006142312A (ja) 2004-11-16 2006-06-08 Aida Eng Ltd プレス機械のダイクッション装置
US20080141668A1 (en) * 2006-12-13 2008-06-19 Michael Micklisch Electrohydraulic drawing press cushion drive
JP2018069297A (ja) * 2016-10-31 2018-05-10 アイダエンジニアリング株式会社 プレス機械のダイクッション装置

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EP2017071A4 (fr) * 2006-05-09 2010-12-01 Amino Corp Presse a commande inférieure
ES2631508T3 (es) * 2008-11-18 2017-08-31 Aida Engineering, Ltd. Dispositivo de amortiguación de troquel para una máquina de prensa
DE102011053615A1 (de) * 2011-09-14 2013-03-14 Ring Maschinenbau Gmbh & Co.Kg Verfahren zum Betreiben einer Stanze
JP5802230B2 (ja) * 2013-03-14 2015-10-28 アイダエンジニアリング株式会社 絞り成形方法及びサーボプレスシステム
JP5968385B2 (ja) * 2014-09-16 2016-08-10 アイダエンジニアリング株式会社 ダイクッション装置及びダイクッション装置の制御方法
DE102016120068A1 (de) * 2016-10-21 2018-04-26 Voith Patent Gmbh Hydraulischer Antrieb für eine Ziehkissenvorrichtung einer Presse
JP6551490B2 (ja) * 2017-11-02 2019-07-31 ダイキン工業株式会社 油圧装置

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Publication number Priority date Publication date Assignee Title
JP2006142312A (ja) 2004-11-16 2006-06-08 Aida Eng Ltd プレス機械のダイクッション装置
US20080141668A1 (en) * 2006-12-13 2008-06-19 Michael Micklisch Electrohydraulic drawing press cushion drive
JP2018069297A (ja) * 2016-10-31 2018-05-10 アイダエンジニアリング株式会社 プレス機械のダイクッション装置

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See also references of EP3845324A4

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JP6702491B1 (ja) 2020-06-03
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EP3845324B1 (fr) 2023-03-08
JP2020171959A (ja) 2020-10-22

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