JP5934673B2 - Crank press machine - Google Patents

Description

  The present invention relates to a crank press machine including a flywheel, a wet clutch mechanism capable of transmitting the power of the flywheel to a crankshaft, and a clutch cylinder for driving the clutch mechanism.

  Conventionally, a clutch mechanism and a brake mechanism are provided between a flywheel to which rotational power is supplied from an external drive source and a crankshaft, and either one is selectively operated by a clutch cylinder. Crank press machines with a control device are known.

  For example, Patent Document 1 includes a hydraulic cylinder that supplies hydraulic oil to a clutch cylinder, a screw / nut mechanism that moves a piston of the hydraulic cylinder back and forth, and a servo motor that controls rotation of the screw / nut mechanism.

JP 2009-236173 A

  However, in the conventional crank press machine, in order to control the rotation of the large mass flywheel, the size of the clutch cylinder is large, and a large amount of high pressure oil must be fed into the pressure chamber.

  In the invention of the above-mentioned Patent Document 1, when the size of the clutch cylinder is increased, the size of the hydraulic cylinder to which the control servo motor is connected must be increased, and the servo motor for driving the hydraulic cylinder needs to be increased. As a result, there is a problem that the size of the crank press increases.

  The present invention has been made in view of the above points, and an object of the present invention is to obtain a crank press machine that can be easily controlled accurately without using a large servo motor.

  In order to achieve the above object, in the present invention, a circuit having another hydraulic power source is provided in addition to a circuit having a servo motor.

  Specifically, the first invention presupposes a crank press machine including a flywheel, a wet clutch mechanism capable of transmitting the power of the flywheel to the crankshaft, and a clutch cylinder that drives the clutch mechanism. And

The hydraulic circuit for supplying high pressure oil to the pressure chamber of the clutch cylinder is
A first circuit having a first hydraulic pressure source for raising the pressure in the pressure chamber to a full clutch pressure at which the clutch mechanism is completely connected;
A second circuit having a second hydraulic pressure source that supplies high pressure oil to a constant pressure lower than the full clutch pressure and capable of driving the clutch cylinder;
The first hydraulic power source includes a servo motor and a first hydraulic pump driven by the servo motor in the forward direction and the reverse direction .

In other words, the servo motor is advantageous in that precise and high-speed rotation control is possible, but in order to drive the clutch cylinder of the crank press machine at high speed only by the servo motor, the hydraulic pump is driven by a relatively large servo motor. It is necessary to feed high pressure oil into the pressure chamber of the clutch cylinder. However, according to the above configuration, not only the servo motor and the first hydraulic pump driven in the forward and reverse directions by the servo motor, but also the second hydraulic source, particularly when the clutch is engaged, is used. Since it can be fed, the clutch mechanism can be connected at high speed without increasing the size of the servo motor.

In the second invention, in the first invention,
A pressure sensor that detects that the pressure chamber reaches the constant pressure and stops the supply of high-pressure oil by the second circuit;
After the fixed pressure is exceeded, up to the full clutch pressure, the high-pressure oil is supplied only by the servo motor and the first hydraulic pump .

According to the above configuration, before the full clutch where the clutch mechanism is completely connected, the supply of the high pressure oil from the second hydraulic power source is stopped, and the high pressure oil is supplied only by the servo motor and the first hydraulic pump driven by the servo motor. Therefore, precise clutch control becomes possible.

In the third invention, the flywheel, the wet clutch mechanism capable of transmitting the power of the flywheel to the crankshaft, the clutch cylinder for driving the clutch mechanism, and the rotation of the crankshaft driven by the clutch cylinder On the premise of a crank press machine provided with a brake mechanism that stops the clutch and a spring member that biases the piston of the clutch cylinder toward the brake mechanism,
The hydraulic circuit for supplying high pressure oil to the pressure chamber of the clutch cylinder is as follows:
A logic circuit that releases high-pressure oil in the pressure chamber until a constant pressure that balances the spring member;
A servo motor for releasing high-pressure oil in the pressure chamber until the brake mechanism is fully connected from the constant pressure until the brake mechanism is completely connected, and a first hydraulic pump driven by the servo motor in the forward and reverse directions. Yes.

In other words, the servo motor is advantageous in that precise and high-speed rotation control is possible, but in order to drive the clutch cylinder of the crank press machine at high speed only by the servo motor, the hydraulic pump is driven by a relatively large servo motor. It is necessary to release the high pressure oil in the pressure chamber of the clutch cylinder and press the piston with the spring member. However, according to the above-described configuration, since the high-capacity high-pressure oil can be released by the logic circuit in order to activate the brake mechanism particularly after the clutch is released, the servo motor and the first driven in the forward direction and the reverse direction by the servo motor The brake mechanism can be applied at high speed without increasing the size of the hydraulic pump . On the other hand, since the high pressure oil in the pressure chamber can be released by the servo motor until the brake mechanism is fully connected, the brake control can be performed with high accuracy.

In the fourth invention, in the third invention,
The logic circuit is
A relief valve that allows high pressure oil to escape when the pressure is constant,
It is provided with a logic valve that opens while the relief valve is releasing high-pressure oil and releases high-pressure oil in the clutch cylinder, and closes when the relief valve stops releasing high-pressure oil.

  According to the above configuration, while the relief valve is releasing high pressure oil to a constant pressure, the logic valve is opened and the high pressure oil in the pressure chamber is released at high speed, and when the pressure chamber is reduced to a constant pressure, the relief valve is closed and the logic is closed. Since the valve is also closed, the high pressure oil in the pressure chamber can be released while performing precise control with a servo motor.

In the fifth invention, the flywheel, the wet clutch mechanism capable of transmitting the power of the flywheel to the crankshaft, the clutch cylinder driving the clutch mechanism, and the rotation of the crankshaft driven by the clutch cylinder On the premise of a crank press machine provided with a brake mechanism that stops the clutch and a spring member that biases the piston of the clutch cylinder toward the brake mechanism,
The hydraulic circuit for supplying high pressure oil to the pressure chamber of the clutch cylinder is as follows:
A first circuit having a first hydraulic pressure source including a servo motor that raises the pressure in the pressure chamber to a full clutch pressure at which the clutch mechanism is completely connected;
A second circuit having a second hydraulic pressure source for supplying high pressure oil to a constant pressure lower than the full clutch pressure and capable of driving the clutch cylinder;
A logic circuit that allows high-pressure oil to escape until a constant pressure is achieved that balances the spring member,
The servo motor is configured to release high-pressure oil in the pressure chamber from the constant pressure until the brake mechanism is fully connected to the brake mechanism.

  In other words, the servo motor is advantageous in that precise and high-speed rotation control is possible, but in order to drive the clutch cylinder of the crank press machine at high speed only by the servo motor, the hydraulic pump is driven by a relatively large servo motor. Therefore, it is necessary to feed the high pressure oil into the pressure chamber of the clutch cylinder to connect the clutch mechanism, or to release the high pressure oil in the pressure chamber to activate the brake mechanism. However, according to the above configuration, a high-capacity high-pressure oil at the time of clutch engagement is sent not only by the servo motor but also by using the second hydraulic power source, or when the brake mechanism is activated, the logic circuit is opened to make the high-pressure oil high speed. Therefore, without increasing the size of the servo motor, the clutch mechanism can be connected at high speed and the brake mechanism can be used.

  As described above, in the present invention, the first circuit having the first hydraulic pressure source including the servo motor that increases the pressure to the full clutch pressure at which the clutch mechanism is completely connected to the hydraulic circuit that supplies the high pressure oil to the clutch cylinder. And a second circuit having a second hydraulic pressure source that supplies high pressure oil to a constant pressure lower than the full clutch pressure and capable of driving the clutch cylinder.

  In addition, a hydraulic circuit that supplies high pressure oil to the clutch cylinder is driven by a logic circuit that releases high pressure oil until a constant pressure that balances with the spring member, and the clutch cylinder is driven from the constant pressure until the brake is fully connected to the brake mechanism. Servo motor to be installed.

  Therefore, according to these inventions, it is possible to obtain a crank press machine that can be easily controlled without using a large servo motor.

1 is a hydraulic circuit diagram of a crank press machine according to an embodiment of the present invention. It is a schematic diagram which simplifies and shows a clutch cylinder and its periphery. It is a graph which shows a mode that the clutch cylinder act | operates in time series.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  Although not shown in detail, the crank press according to the embodiment of the present invention includes a main motor that can switch between a driving state and an idling state, and the power of the main motor is transmitted to the flywheel 10. Yes. As shown in part in FIG. 2, the crank press machine further includes a crankshaft 11 that is rotated by a flywheel 10. One end of the crankshaft 11 is connected to the flywheel 10 via a wet disk type clutch mechanism 12. When the clutch mechanism 12 is connected, the rotational power of the flywheel 10 is transmitted to the crankshaft 11, and when the clutch mechanism 12 is released, the rotational power is cut off. A disc-type brake mechanism 13 that decelerates or stops the rotation of the crankshaft 11 is provided at a position facing the clutch mechanism 12.

  A slide is connected to the lower side of the crankshaft 11 via a connecting rod. The slide is configured to be reciprocated up and down between the upper standby position and the lower press position in conjunction with the crankshaft 11. The upper die of the die for forging press can be attached to the lower surface. The crank press is controlled by a control panel 9 (shown only in FIG. 1).

  As shown in FIG. 2, the clutch mechanism 12 includes an inner disk 10 a whose inner periphery is spline-coupled to a clutch boss portion 14 that is integrally fixed to the crankshaft 11 and an outer periphery that is spline-coupled to the flywheel 10 side. And an outer disk 10b.

  The brake mechanism 13 includes an inner disk 13a whose inner periphery is spline-coupled to a brake boss portion 15 that is rotatably and integrally fixed to the crankshaft 11, and an outer disk 13b whose outer periphery is spline-coupled to the case 16.

  A clutch cylinder 17 that can reciprocate along the crankshaft 11 is disposed between the clutch mechanism 12 and the brake mechanism 13. The clutch cylinder 17 includes a piston 17a, a rod 17b connected to the piston 17a, and a spring member 17c that presses the piston 17a toward the brake mechanism 13 side. With this configuration, when high pressure oil is introduced into the pressure chamber 17d on the opposite side of the spring member 17c, the spring member 17c is pushed back, and when the inner disk 10a is brought into close contact with the outer disk 10b, the clutch mechanism 12 is connected. By extracting the high pressure oil from the pressure chamber 17d, the inner disk 10a and the outer disk 10b are separated by the urging force of the spring member 17c, and the clutch is disconnected.

  In the present embodiment, by removing the high pressure oil from the pressure chamber 17d, the spring member 17c further presses the piston 17a, and the inner disk 13a and the outer disk 13b are in close contact with each other so that the brake mechanism 13 is effective. .

  And the crank press machine of this embodiment is provided with the hydraulic circuit 20 which sends high pressure oil into the pressure chamber 17d. As shown in FIG. 1, the hydraulic circuit 20 includes a first circuit 20a having a servo motor 21 that increases the pressure in the pressure chamber 17d to a full clutch pressure at which the clutch mechanism 12 is completely connected, and a full clutch pressure. And a second circuit 20b having a second hydraulic pressure source for supplying high-pressure oil to a constant pressure that can drive the clutch cylinder 17 at a low level. The servo motor 21 is controlled by the control panel 9.

  The first circuit 20 a includes a first piston pump 22 that is driven by the servomotor 21 in the forward direction and the reverse direction. The first piston pump 22 can discharge the hydraulic oil in the oil tank 23 to the pressure chamber 17d as high-pressure oil, and forcibly discharge the high-pressure oil in the pressure chamber 17d to the oil tank 23 by rotating in the reverse direction. It is also possible to do. The servo motor 21 and the first piston pump 22 constitute a first hydraulic power source. A hydraulic pump other than the piston pump may be used as the first hydraulic source.

  The second circuit 20b includes a constant torque motor 24, for example. A second piston pump 25 is connected to the constant torque motor 24. The constant torque motor 24 and the second piston pump 25 constitute a second hydraulic pressure source. As the second hydraulic pressure source, an electric motor other than the constant torque electric motor 24 may be used, and it is not necessary to perform rotation control with higher accuracy than the servo motor 21. Further, a hydraulic pump other than the piston pump may be used. A first electromagnetic valve 26 is provided on the discharge side of the second piston pump 25.

  The second circuit 20b is provided with an accumulator 27 for storing high-pressure oil from the second piston pump 25. The accumulator 27 prevents the pressure in the hydraulic circuit 20 from rapidly decreasing when a large volume of high-pressure oil is fed into the pressure chamber 17d.

  On the other hand, the hydraulic circuit 20 is provided with a pressure sensor 28 for detecting that the pressure chamber 17d becomes a constant pressure. For example, in this embodiment, when the pressure in the pressure chamber 17d is 2 MPa, it balances with the spring member 17c, and when it exceeds 5 MPa, the clutch mechanism 12 starts to be connected and becomes a half-clutch (soft clutch) state. It becomes a full clutch state that leads to. For example, the pressure sensor 28 detects that the pressure in the pressure chamber 17 d becomes a constant pressure of 5 MPa when the clutch mechanism 12 is connected, and sends a detection signal to the control panel 9. The control panel 9 that has received the signal is configured to send a signal to the first electromagnetic valve 26 to be in the OFF state shown in FIG. 1 and stop the supply of high-pressure oil from the second piston pump 25. After the pressure exceeds 5 MPa, the high pressure oil is supplied to the pressure chamber 17d only by the servo motor 21 until the full clutch pressure.

  The first circuit 20a is provided with a logic circuit 30 that allows the high-pressure oil in the pressure chamber 17d to escape until the pressure reaches 2 MPa that balances with the spring member 17c. The logic circuit 30 includes a relief valve 31 that releases high-pressure oil when the pressure reaches 2 MPa.

  A second solenoid valve 32 is provided on the discharge side of the relief valve 31. When the second electromagnetic valve 32 is OFF shown in FIG. 1, the high pressure oil of 2 MPa or more from the relief valve 31 is released to the oil tank 23, and when it is ON, the high pressure oil of 2 MPa or more from the relief valve 31 is not allowed to pass through. It is like that.

  The first circuit 20a is provided with a logic valve 33 that releases high-pressure oil in the clutch cylinder 17 while the relief valve 31 is releasing high-pressure oil, and closes when the relief valve 31 stops releasing high-pressure oil. . In order to control the logic valve 33, a shuttle valve 34 is disposed between the logic valve 33 and the relief valve 31. The logic valve 33 is configured to be closed by the pilot pressure from the shuttle valve 34.

  When the logic valve 33 is closed, the servo motor 21 allows the high pressure oil in the pressure chamber 17d to escape while adjusting the rotation until the brake mechanism 13 is fully connected.

  Next, the operation of the crank press according to this embodiment will be described.

  As illustrated in time series in FIG. 3, when the clutch mechanism 12 is connected and the power of the flywheel 10 is transmitted to the crankshaft 11, the first electromagnetic valve 26 and the second electromagnetic valve 32 are controlled by the control panel 9. Becomes ON, and the servo motor 21 is rotated forward. In order to quickly connect the clutch mechanism 12, not only the servomotor 21 but also the constant torque motor 24 is driven, and the high pressure oil from the oil tank 23 is rapidly supplied to the pressure chamber 17 d by the second piston pump 25. For this reason, the pressure of the pressure sensor 28 efficiently increases from 0 MPa to 5 MPa. At this time, in the logic circuit 30, the logic valve 33 is closed by the pilot pressure from the shuttle valve 34. Further, due to the action of the accumulator 27, the pressure in the hydraulic circuit 20 does not rapidly decrease even when a large volume of high-pressure oil is fed into the pressure chamber 17d.

  When the value of the pressure sensor 28 reaches 5 MPa, the signal is sent to the control panel 9, the first electromagnetic valve 26 is turned off, and the supply of high pressure oil is stopped. At 5 MPa, the clutch mechanism 12 is just before the half clutch state.

  Then, the pressure is gradually increased to 8 MPa while accurately controlling the servo motor 21 from the state where the pressure chamber 17d is 5 MPa. At 8 MPa, the clutch mechanism 12 is completely connected, the power of the flywheel 10 is transmitted to the crankshaft 11, and a pressing operation is performed. Since there is no need for further boosting by the servo motor 21, the servo motor 21 stops.

  Next, as shown in FIG. 1, when the second electromagnetic valve 32 is turned off by the control panel 9, the high pressure oil in the pressure chamber 17 d flows into the relief valve 31 through the shuttle valve 34. Since the relief valve 31 is relieved to 2 MPa, the high-pressure oil in the pressure chamber 17 d is discharged to the oil tank 23 through the second electromagnetic valve 32. Then, the pilot pressure that closed the logic valve 33 disappears, the logic valve 33 opens, and the high-pressure oil in the pressure chamber 17d is discharged to the oil tank 23 at once. At the same time, the servo motor 21 starts to reverse, and the high-pressure oil in the pressure chamber 17d is forcibly discharged to the oil tank 23. Thereby, the pressure in the pressure chamber 17d decreases, and the piston 17a pushed by the spring member 17c moves to the brake mechanism 13 side immediately before the brake mechanism 13 starts to work.

  Next, when the pressure in the pressure chamber 17 d is reduced to 2 MPa, the relief valve 31 is stopped and the logic valve 33 is closed again by the pilot pressure of the shuttle valve 34. Thereafter, the high-speed oil in the pressure chamber 17d is discharged with high accuracy by the reverse rotation operation of the servo motor 21, the brake mechanism 13 is completely connected and becomes a full brake, and the rotation of the crankshaft 11 is stopped.

  As described above, the servo motor 21 is advantageous in that precise and high-speed rotation control can be performed. However, in order to drive the clutch cylinder 17 of the crank press machine at high speed only by the servo motor 21, a relatively large servo motor 21 is used. It is necessary to drive the hydraulic pump to feed high pressure oil into the pressure chamber 17d of the clutch cylinder 17, or to release the high pressure oil in the pressure chamber 17d to activate the brake mechanism 13.

  However, in this embodiment, a large volume of high-pressure oil at the time of clutch engagement is sent to the pressure chamber 17d using not only the servo motor 21 but also the constant torque motor 24. Further, when the brake mechanism 13 is activated, the logic circuit 30 is opened to discharge high-pressure oil at a high speed. For this reason, the clutch mechanism 12 can be connected at high speed and the brake mechanism 13 can be effective without increasing the size of the servo motor 21.

  Before the full clutch in which the clutch mechanism 12 is completely connected, the supply of high-pressure oil from the constant torque motor 24 can be stopped and the high-pressure oil can be supplied from the servo motor 21, so that precise control is possible.

  Similarly, since the servo motor 21 can release the high-pressure oil in the pressure chamber 17d until the brake mechanism 13 is fully connected, the control can be performed with high accuracy.

  Therefore, according to the crank press machine according to the present embodiment, a crank press machine that can be easily controlled can be obtained without using the large servo motor 21.

(Other embodiments)
The present invention may be configured as follows with respect to the above embodiment.

  That is, in the above embodiment, the brake mechanism 13 and the clutch mechanism 12 are driven by one clutch cylinder 17, but the brake mechanism 13 is disposed at a position away from the clutch mechanism 12, and is separated from each other. You may be comprised so that it may drive with a cylinder.

  Further, when the servomotor 21 is driven in the forward direction, the first piston pump 22 does not directly discharge the hydraulic oil in the oil tank 23 but discharges hydraulic oil from the secondary side of the second piston pump 25. It may be a thing. In this case, the boosting capability required for the servo motor 21 can be reduced, and the degree of design freedom is further increased.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or a use.

9 Control panel
10 Flywheel
10a Inner disc
10b Outer disk
11 Crankshaft
12 Clutch mechanism
13 Brake mechanism
13a Inner disc
13b Outer disk
14 Clutch boss
15 Brake boss
16 cases
17 Clutch cylinder
17a piston
17b Rod
17c Spring member
17d pressure chamber
20 Hydraulic circuit
20a first circuit
20b Second circuit
21 Servo motor (first hydraulic power source)
22 First piston pump (first hydraulic power source)
23 Oil tank
24 constant torque motor (second hydraulic power source)
25 Second piston pump (second hydraulic power source)
26 1st solenoid valve
27 Accumulator
28 Pressure sensor
30 logic circuits
31 Relief valve
32 Second solenoid valve
33 Logic valve
34 Shuttle valve

Claims (5)

In a crank press machine comprising a flywheel, a wet clutch mechanism capable of transmitting the power of the flywheel to a crankshaft, and a clutch cylinder for driving the clutch mechanism,
The hydraulic circuit for supplying high pressure oil to the pressure chamber of the clutch cylinder is as follows:
A first circuit having a first hydraulic pressure source for raising the pressure in the pressure chamber to a full clutch pressure at which the clutch mechanism is completely connected;
A second circuit having a second hydraulic pressure source that supplies high pressure oil to a constant pressure lower than the full clutch pressure and capable of driving the clutch cylinder;
The crank press machine according to claim 1, wherein the first hydraulic pressure source includes a servo motor and a first hydraulic pump driven by the servo motor in a forward direction and a reverse direction . The crank press according to claim 1,
A pressure sensor that detects that the pressure chamber reaches the constant pressure and stops the supply of high-pressure oil by the second circuit;
A crank press machine configured to supply high-pressure oil only by the servo motor and the first hydraulic pump until the full clutch pressure is exceeded after the predetermined pressure is exceeded. A flywheel, a wet clutch mechanism capable of transmitting the power of the flywheel to the crankshaft, a clutch cylinder that drives the clutch mechanism, and a brake mechanism that is driven by the clutch cylinder and stops the rotation of the crankshaft. A crank press machine comprising a spring member for urging the piston of the clutch cylinder toward the brake mechanism,
The hydraulic circuit for supplying high pressure oil to the pressure chamber of the clutch cylinder is as follows:
A logic circuit that releases high-pressure oil in the pressure chamber until a constant pressure that balances the spring member;
A servo motor for releasing high-pressure oil in the pressure chamber until the brake mechanism is fully connected from the constant pressure until the brake mechanism is completely connected, and a first hydraulic pump driven by the servo motor in the forward and reverse directions. Crank press machine characterized by The crank press according to claim 3,
The logic circuit is
A relief valve that allows high pressure oil to escape when the pressure is constant,
A crank having a logic valve that opens while the relief valve is releasing high-pressure oil to release high-pressure oil in the clutch cylinder and closes when the relief valve stops releasing high-pressure oil. Press machine. A flywheel, a wet clutch mechanism capable of transmitting the power of the flywheel to the crankshaft, a clutch cylinder that drives the clutch mechanism, and a brake mechanism that is driven by the clutch cylinder and stops the rotation of the crankshaft. A crank press machine comprising a spring member for urging the piston of the clutch cylinder toward the brake mechanism,
The hydraulic circuit for supplying high pressure oil to the pressure chamber of the clutch cylinder is as follows:
A first circuit having a first hydraulic pressure source including a servo motor that raises the pressure in the pressure chamber to a full clutch pressure at which the clutch mechanism is completely connected;
A second circuit having a second hydraulic pressure source for supplying high pressure oil to a constant pressure lower than the full clutch pressure and capable of driving the clutch cylinder;
A logic circuit that allows high-pressure oil to escape until a constant pressure is achieved that balances the spring member,
The crank press machine according to claim 1, wherein the servo motor is configured to release high-pressure oil in the pressure chamber from the constant pressure until the brake mechanism is fully connected to the brake mechanism.

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