JP6768536B2 - Forging press equipment - Google Patents

Description

The present invention relates to a forging press device.

Some forging press devices include a knockout portion for projecting a forged object to be molded from a mold (see, for example, Patent Document 1). In addition, there is a system in which a forging press device and a transfer device cooperate to perform from molding to transfer of an object to be molded. In such a system, when the forging press device forges the object to be molded, the knockout portion projects the object to be molded from the mold, and the projected object to be molded is conveyed by the transfer device.

JP-A-2010-207857

The operation of one cycle of the forging press includes a process in which the knockout portion protrudes the object to be formed from the mold and moves the object to be formed to a position where the transfer device can grip the object. In order to improve the production efficiency of forged products, it is required to shorten the operating time of the knockout portion in addition to shortening the time of other processes.

The knockout portion requires a relatively large force to project the forged object to be molded from the mold, and further requires a stroke to move the object to be molded to a position where the transfer device can grip it. Therefore, in order to shorten the operating time of the knockout section, it is necessary to significantly increase the capacity of the power supply section of the knockout section. The power supply unit corresponds to a hydraulic unit that supplies hydraulic pressure if it is a hydraulic knockout unit, and corresponds to a power supply board if it is an electric knockout unit. If the capacity of the power supply unit is significantly increased, the size of the power supply unit becomes large, which raises the problem that it becomes difficult to secure the installation space of the power supply unit.

An object of the present invention is to provide a forging press device capable of avoiding an increase in size of a power supply unit of a knockout unit while shortening the operating time of the knockout unit.

The forging press device according to the present invention is
A slide that moves the mold forward and backward,
An eccentric shaft that moves the slide forward and backward by rotating,
A transmission shaft that penetrates the inside of the eccentric shaft and is rotatable relative to the eccentric shaft,
The drive mechanism that rotates the transmission shaft and
A speed reducer that slows down the rotation of the transmission shaft and transmits it to the eccentric shaft.
A knockout portion that projects the molded object from the mold and
An energy recovery unit connected to the transmission shaft, recovering the rotational energy of the transmission shaft, and supplying the energy to the knockout unit.
It was configured to include.

According to the present invention, it is possible to avoid an increase in size of the power supply unit of the knockout unit while shortening the operating time of the knockout unit.

It is a block diagram which shows the forging press apparatus which concerns on 1st Embodiment of this invention. It is a figure which shows a detailed example of a hydraulic circuit part. It is a time chart which shows the operation of each part of the forging press apparatus of 1st Embodiment. It is a figure which shows an example of the electric circuit part in the forging press apparatus which concerns on 2nd Embodiment of this invention.

Hereinafter, each embodiment of the present invention will be described in detail with reference to the drawings.

(First Embodiment)
FIG. 1 is a configuration diagram showing a forging press device according to the first embodiment of the present invention.

As shown in FIG. 1, the forging press device 1 according to the first embodiment includes a crown 21, an upright 22, a bed 23, a slide 18, a guide 19, and a bolster 24. The lower mold 32 is fixed to the upper part of the bolster 24. The upper mold 31 is fixed to the lower part of the slide 18.

The crown 21, the upright 22, and the bed 23 are frame portions that support each drive portion of the forging press device 1. The crown 21, the upright 22 and the bed 23 are fastened to each other by inserting the tie rod 25a into them and tightening them with the tie rod nut 25b.

The bolster 24 is fixed to the bed 23. The slide 18 is guided by the guide 19 so as to be able to move forward and backward, for example, in the vertical direction. The guide 19 is supported by a frame portion such as an upright 22. By lowering the slide 18, the upper die 31 and the lower die 32 come close to each other, and the workpiece can be forged between them. The direction in which the slide 18 advances and retreats is not particularly limited, but will be described below assuming that the slide 18 advances and retreats in the vertical direction.

A transport device 40 is provided in the vicinity of the forging press device 1. The transfer device 40 may also be referred to as a transfer feeder. After molding the object to be molded, the upper mold 31 and the lower mold 32 are separated from each other, and then the transfer device 40 conveys the object to be molded.

<Power transmission mechanism>
The forging press device 1 includes a motor 11, a flywheel 12, a clutch brake 13, a transmission shaft 14, a speed reducer 15, an exen shaft 16, a connecting rod 17, and a control unit 2 as a configuration for raising and lowering the slide 18. Of these, the motor 11, the flywheel 12, and the clutch brake 13 correspond to an example of the drive mechanism according to the present invention.

The motor 11 is fixed to a frame portion such as a crown 21. The spindle portion 16a of the eccentric shaft 16 is rotatably supported by a frame portion such as a crown 21 or an upright 22 via a bearing 41. The clutch brake 13 and the speed reducer 15 are supported by a frame portion such as a crown 21 or an upright 22 via a frame member.

The motor 11 is, for example, an induction motor, and generates power for raising and lowering the slide 18. The power of the motor 11 is transmitted to the flywheel 12 via, for example, the belt 11a, and rotates the flywheel 12.

The clutch brake 13 can interrupt the flywheel 12 and the transmission shaft 14, and when these are connected, the rotational motion of the flywheel 12 is transmitted to the transmission shaft 14. Further, the clutch brake 13 intermittently connects the transmission shaft 14 and the fixed portion. The fixed portion is, for example, a frame portion such as an upright 22 or a member fixed to the frame portion.

The eccentric shaft 16 has a hollow portion penetrating along the rotation center axis. The transmission shaft 14 is rotatably arranged in the hollow portion relative to the eccentric shaft 16. The transmission shaft 14 transmits the rotational motion of the flywheel 12 to the speed reducer 15. The speed reducer 15 decelerates the rotational movement of the transmission shaft 14 and transmits it to the eccentric shaft 16.

The eccentric shaft 16 has an eccentric portion 16b that is eccentric with respect to the spindle portion 16a, and the eccentric portion 16b is connected to the connecting rod 17. The connecting rod 17 connects the eccentric shaft 16 and the slide 18, converts the rotational motion of the eccentric shaft 16 into a linear motion, and transmits the linear motion to the slide 18.

Since the eccentric shaft 16 is configured to rotate once in one cycle of the forging press, the rotation speed is low. On the other hand, in the present embodiment, by having the transmission shaft 14 and the speed reducer 15, the rotational speeds of the motor 11 and the flywheel 12 can be increased as compared with the configuration in which the flywheel and the eccentric shaft are directly connected. .. As a result, the forging press device 1 can be operated efficiently.

The control unit 2 controls the drive and stop of the motor 11 and the disengagement of the clutch brake 13. The flywheel 12 is rotationally driven by driving the motor 11 under the control of the control unit 2. Further, when the clutch brake 13 connects the flywheel 12 and the transmission shaft 14 under the control of the control unit 2, the motion is transmitted to the transmission shaft 14, the reduction gear 15, the eccentric shaft 16 and the connecting rod 17, and the slide 18 moves up and down. .. Further, when the clutch brake 13 connects the transmission shaft 14 to the fixed portion under the control of the control unit 2, the rotation of the transmission shaft 14 is braked, and this braking force is transmitted to the speed reducer 15 and the executor shaft 16 to slide 18. The ascent and descent is braked.

<Knockout section>
The forging press device 1 further includes a knockout section 51, a hydraulic circuit section 52, and an energy recovery section 53.

The knockout portion 51 has a knockout pin 51a that can move from the inner surface portion of the lower mold 32 into the mold, and a hydraulic cylinder 51b that drives the knockout pin 51a. The hydraulic cylinder 51b is supported by the bed 23 and is hydraulically driven. When the hydraulic cylinder 51b is driven, the knockout pin 51a protrudes the molded object from the lower mold 32 and raises it to a position where the transport device 40 can be gripped.

FIG. 2 is a diagram showing a detailed example of the hydraulic circuit. In FIG. 2, the main body 1A of the forging press device 1 is shown in a simplified manner. Further, the hydraulic cylinder 51b is drawn separately from the main body 1A. The main body 1A refers to a portion of the forging press device 1 excluding the hydraulic circuit.

As shown in FIGS. 1 and 2, the hydraulic circuit for driving the knockout unit 51 includes a hydraulic cylinder 51b, a hydraulic circuit unit 52, an energy recovery unit 53, and a tank 54. As shown in FIG. 2, the hydraulic circuit unit 52 includes an accumulator unit 71, a hydraulic unit 72, and a control valve 73.

The energy recovery unit 53 includes a pump 53a connected to the transmission shaft 14. As the transmission shaft 14 rotates, the rotating portion of the pump 53a rotates, and the hydraulic oil is sent out from the tank 54. When a load is applied to the hydraulic oil delivered from the pump 53a, the pump 53a recovers energy from the transmission shaft 14, and a braking force is applied from the pump 53a to the transmission shaft 14. On the other hand, when no load is applied to the hydraulic oil delivered from the pump 53a, the pump 53a does not recover energy from the transmission shaft 14, and the transmission shaft 14 can rotate without receiving a large resistance from the pump 53a.

The pressure accumulator 71 includes a recovery valve 711, a check valve 712, an accumulator 713, and a release valve 714. The pressure accumulator 71 can accumulate pressure by pressurizing the hydraulic oil with the energy recovered by the energy recovery unit 53. The pressure accumulator 71 may be provided with a safety valve such as a relief valve upstream of the check valve 712.

The recovery valve 711 switches between a loaded state in which the hydraulic oil delivered from the pump 53a is sent to the check valve 712 side and a no-load state in which the hydraulic oil is sent to the tank 715. By this switching, the state of the energy recovery unit 53 is switched between the energy recovery state and the non-recovery state. The recovery valve 711 is switched and controlled by the control unit 2.

The check valve 712 prevents the hydraulic oil from being sent back from the accumulator 713 to the recovery valve 711. High pressure is applied to the oil passage on the accumulator 713 side from the check valve 712.

The accumulator 713 can accumulate hydraulic oil pressure.

The release valve 714 is provided in the oil passage between the accumulator 713 and the control valve 73, and can switch between a state in which the hydraulic pressure accumulated in the accumulator 713 is discharged to the control valve 73 side and a non-release state. The release valve 714 is switched and controlled by the control unit 2.

The hydraulic unit 72 is a power supply source that is driven by an external power source to pressurize hydraulic oil, and includes an electric motor 721, a pump 722, and a check valve 723. The hydraulic unit 72 may be provided with a safety valve such as a relief valve upstream of the check valve 723.

The check valve 723 prevents the hydraulic oil from being sent back from the output port of the hydraulic unit 72 to the pump 722.

The pump 722 applies pressure to the hydraulic oil by driving the electric motor 721 and sends the hydraulic oil from the tank 724 through the check valve 723 from the output port of the hydraulic unit 72. The electric motor 721 is driven and controlled by the control unit 2.

The control valve 73 is a valve that controls the operation of the hydraulic cylinder 51b. The control valve 73 sends the hydraulic oil pressurized by one or both of the accumulator 71 and the hydraulic unit 72 in the direction of pushing the piston d to the hydraulic cylinder 51b (ON) and in the direction of pulling back the piston d. It is possible to switch to the state (OFF). The control valve 73 is switched and controlled by the control unit 2.

<Arrangement of components>
The transmission shaft 14 penetrates the inside of the eccentric shaft 16 and is arranged coaxially with the eccentric shaft 16. The flywheel 12 and the clutch brake 13 are arranged in the vicinity of one end of the transmission shaft 14 in the axial direction. The speed reducer 15 is arranged near the other end of the transmission shaft 14 in the axial direction, that is, near the opposite end of the flywheel 12 and the clutch brake 13. The flywheel 12, the clutch brake 13, and the speed reducer 15 are arranged coaxially with the eccentric shaft 16.

With such an arrangement, the heavy flywheel 12 and the clutch brake 13 and the heavy speed reducer 15 can be distributed and arranged on both sides of the eccentric shaft 16 in the axial direction. As a result, a good weight balance of the forging press device 1 can be achieved. Further, a transmission shaft 14 penetrating the inside of the eccentric shaft 16 is interposed between the flywheel 12 and the speed reducer 15. Therefore, a good weight balance of the forging press device 1 can be achieved by interposing the transmission shaft 14 while adopting a configuration in which the rotary motion of the motor 11 is decelerated by the speed reducer 15 and transmitted to the eccentric shaft 16. ..

Further, on the extension of the axis of the transmission shaft 14, a rotary joint 43 for supplying hydraulic oil to the clutch brake 13 is arranged outside the clutch brake 13. With such an arrangement, hydraulic oil can be efficiently sent to the clutch brake 13, and the number of parts can be reduced. The rotary joint 43 is connected to a supply means (for example, a tank, a pump, etc.) (for example, a tank and a pump) for supplying hydraulic oil.

The energy recovery unit 53 is arranged on the axis extension of the transmission shaft 14 on the opposite side of the rotary joint 43 with the transmission shaft 14 interposed therebetween. With such an arrangement, the rotating portion of the pump 53a and the transmission shaft 14 can be directly connected, and the number of parts can be reduced as compared with the case where the transmission mechanism such as a two-axis gear is interposed and connected. You can plan.

<Cycle operation>
Subsequently, the cycle operation of the forging press of the forging press device 1 according to the first embodiment will be described. FIG. 3 is a time chart showing the operation of each part of the forging press device. FIG. 3A shows the movement of the slide 18 and the hydraulic cylinder 51b, and FIGS. 3B to 3F show the pump 53a, the recovery valve 711, the discharge valve 714, the control valve 73, and the hydraulic unit 72, respectively. Shows the operation of.

The slide 18 moves up and down as shown in FIG. 3A by the drive control of the motor 11 and the intermittent control of the clutch brake 13. Specifically, first, the slide 18 descends in the period T1 from the state where the slide 18 is stopped upward, then the object to be molded is pressure-molded in the period T2 near the bottom dead center, and then rises in the period T3. When the slide 18 is raised, the clutch brake 13 applies a braking force to the transmission shaft 14. Then, the slide 18 stops upward.

During the periods T1, T2, and T3, the transmission shaft 14 rotates, which causes the pump 53a of the energy recovery unit 53 to rotate, as shown in FIG. 3B. On the other hand, when the slide 18 is stopped, the pump 53a is stopped.

As shown in FIG. 3C, the recovery valve 711 is switched to the loaded state during the period T3 and to the unloaded state during the other period under the control of the control unit 2. As a result, during the period T3 when the slide 18 rises, the inertial energy of the eccentric shaft 16 and the slide 18 is recovered by the energy recovery unit 53 via the transmission shaft 14 and the speed reducer 15. The energy recovery unit 53 sends hydraulic oil to the accumulator 713 by the recovered energy, and supplies hydraulic pressure to the accumulator 713. Further, when the slide 18 rises, a braking force acts on the eccentric shaft 16 and the slide 18 due to the recovery of energy.

As shown in FIG. 3D, the release valve 714 is switched to a state of discharging hydraulic pressure during the period T4 from the pressure molding to the completion of the operation of the hydraulic cylinder 51b under the control of the control unit 2. Be done.

As shown in FIG. 3F, in the hydraulic unit 72, for example, the electric motor 721 is constantly driven to apply hydraulic pressure to the output port of the hydraulic unit 72. By such operation of the hydraulic unit 72 and the discharge valve 714, high hydraulic pressure is supplied to the input port of the control valve 73 at least during the period T4.

As shown in FIG. 3 (E), the state of the control valve 73 is switched by the control of the control unit 2 in a predetermined period T4 after the completion of pressure molding. Specifically, during the ascending period of the slide 18, the control valve 73 is switched to deliver hydraulic oil to the hydraulic cylinder 51b in the direction of pushing the piston d (ON). As a result, the hydraulic cylinder 51b is driven, and the knockout pin 51a projects the molded object from the lower mold 32 and moves it to a position where the transfer device 40 can be gripped. Subsequently, the control valve 73 maintains this state (ON) at least until the transfer device 40 grips the object to be molded and starts the transfer. After that, the control valve 73 is switched so as to send hydraulic oil in the direction of pulling back the piston d to the hydraulic cylinder 51b (OFF). As a result, the hydraulic cylinder 51b is driven, and the knockout pin 51a moves to the inner surface portion of the lower mold 32. This completes the operation of one forming cycle of the forging press.

As described above, according to the forging press device 1 of the first embodiment, the energy recovery unit 53 recovers the inertial energy of the slide 18 and the eccentric shaft 16, and the recovered energy is used to apply hydraulic pressure to the knockout unit 51. Be supplied. A large amount of power can be supplied to the knockout portion 51 without significantly improving the capacity of the hydraulic unit 72 by the amount of the supplied hydraulic pressure. As a result, the operating time of the knockout portion 51 can be shortened while avoiding an increase in the size of the hydraulic unit 72. The configuration of the pressure accumulator 71 is smaller in size than the configuration of the hydraulic unit 72. Therefore, the production efficiency of the forging press can be improved by shortening the operating time of the knockout portion 51. Further, by avoiding the increase in size of the hydraulic unit 72, it becomes easy to secure the entire arrangement space of the power supply unit of the knockout unit 51 including the accumulator unit 71 and the control valve 73.

Further, according to the forging press device 1 of the first embodiment, the energy recovery unit 53 is connected to the transmission shaft 14 and recovers the rotational energy from the transmission shaft 14. Since the eccentric shaft 16 does not rotate at a very high speed, if the pump 53a of the energy recovery unit 53 is rotated by the rotation of the eccentric shaft 16, the energy recovery efficiency becomes low. However, by recovering the energy from the transmission shaft 14, high energy recovery efficiency by the energy recovery unit 53 can be obtained.

Further, according to the forging press device 1 of the first embodiment, the energy recovery unit 53 recovers energy during the period T3 (see FIG. 3) when the slide 18 rises. Therefore, as compared with the case where there is no recovery configuration, a part of the energy discharged at the time of braking the clutch brake 13 can be effectively utilized as the power of the knockout unit 51.

Further, according to the forging press device 1 of the first embodiment, the energy recovery unit 53 is arranged on the extension of the axis of the transmission shaft 14 and is connected to the transmission shaft 14. Therefore, the number of parts can be reduced as compared with the case where a transmission mechanism such as a biaxial gear is interposed between the energy recovery unit 53 and the transmission shaft 14. Further, the energy recovery unit 53 is provided on one end side and the other end side of the transmission shaft 14 on which the speed reducer 15 is arranged. Therefore, even if the rotary joint 43 for supplying hydraulic oil to the clutch brake 13 is arranged on the other end side of the transmission shaft 14, the energy recovery unit 53 can be arranged without interfering with the rotary joint 43.

(Second Embodiment)
FIG. 4 is a diagram showing an example of an electric circuit unit in the forging press device according to the second embodiment of the present invention. The forging press device according to the second embodiment is different from the first embodiment in that an electric knockout portion 51 is adopted. A detailed description of the same configuration as that of the first embodiment will be omitted.

The forging press device according to the second embodiment includes an electric drive device 51c as a configuration for driving the knockout pin 51a. As the drive device 51c, for example, an actuator for moving the plunger d1 forward and backward can be adopted. The drive device 51c is supported by the bed 23.

Further, the forging press device according to the second embodiment has a power supply board 83, a generator 53b, a converter 81, a power storage unit 82, a power supply board 83, a drive circuit 84, and a control unit 2A as a configuration for driving the drive device 51c. To be equipped.

The generator 53b is provided in the energy recovery unit 53, is connected to the transmission shaft 14, and recovers the rotational energy of the transmission shaft 14 by the rotation of the transmission shaft 14 to generate electricity. When the converter 81 inputs a current, the generator 53b is loaded and recovers energy. On the other hand, in the generator 53b, since the converter 81 cuts off the current, no load is applied and energy is not recovered.

Under the control of the control unit 2A, the converter 81 inputs a current from the generator 53b during the period of recovering the energy of the transmission shaft 14, converts the electric power, and stores it in the power storage unit 82. Further, the converter 81 cuts off the current of the generator 53b under the control of the control unit 2A during the period when the energy of the transmission shaft 14 is not recovered.

The power storage unit 82 is a secondary battery, a high-capacity capacitor, or the like, and outputs the stored power to the drive circuit 84.

The power supply board 83 is equipped with a power supply circuit, converts the power received from the external power supply E, and outputs the power to the drive circuit 84.

The drive circuit 84 receives the electric power supplied from the power supply board 83 and the power storage unit 82 under the control of the control unit 2A, and outputs a current to the drive device 51c. The drive circuit 84 drives the drive device 51c in the direction of pushing out the plunger d1 at a predetermined timing, and drives the drive device 51c in the direction of pulling back the plunger d1 at another predetermined timing. The drive timing of the drive device 51c is, for example, the same as the drive timing of the hydraulic cylinder 51b of the first embodiment (see FIG. 3A).

As described above, according to the forging press apparatus of the second embodiment, the energy recovery unit 53 converts the rotational energy from the transmission shaft 14 into electric power and recovers it, and this electric power is used to drive the knockout unit 51. Therefore, it is possible to increase the driving ability of the knockout unit 51 and shorten the operating time of the knockout unit 51. Further, even if the operation time is shortened, it is not necessary to significantly increase the capacity of the power supply board 83, and it is possible to avoid the increase in size of the power supply board 83.

Each embodiment of the present invention has been described above. However, the present invention is not limited to the above embodiment. For example, in the above embodiment, the knockout portion 51 is arranged on the bed 23, but the knockout portion is provided on the slide 18 and the knockout pin is moved from the inner surface of the upper mold 31 into the mold. It may be a configuration. Further, in the above embodiment, the energy recovery unit 53 recovers the energy during the period when the slide 18 rises, but the energy may be recovered during the other period. Further, an example in which the hydraulic unit 72 is provided in the first embodiment and the power supply board 83 that receives the external power source E is provided in the second embodiment is shown. However, the hydraulic unit 72 or the power supply board 83 may be omitted as long as the knockout unit 51 can be driven only by the energy recovered by the energy recovery unit 53. Further, in the above embodiment, an example in which hydraulic oil is used as the hydraulic fluid is shown, but other fluids may be used as the hydraulic fluid. In that case, the portion described as hydraulic pressure in the embodiment may be read as hydraulic pressure. In addition, the details shown in the embodiment such as the hydraulic circuit for driving the knockout unit 51, the electric circuit for driving the drive device 51c, and the operation timing of the knockout unit 51 can be appropriately changed without departing from the spirit of the invention.

1 Forging press device 2 Control unit 11 Motor 12 Flywheel 13 Clutch brake 14 Transmission shaft 15 Reducer 16 Excen shaft 17 Connecting rod 18 Slide 21 Crown 22 Upright 23 Bed 24 Bolster 31 Upper mold 32 Lower mold 51 Knockout part 51a Knockout Pin 51b Hydraulic cylinder 51c Drive device 52 Hydraulic circuit part 53 Energy recovery part 53a Pump 53b Generator 71 Accumulation part 72 Hydraulic unit 73 Control valve 81 Converter 82 Power storage part 83 Power supply board 84 Drive circuit 711 Recovery valve 713 Accumulator 714 Release valve 721 Electric Motor 722 pump

Claims (6)

A slide that moves the mold forward and backward,
An eccentric shaft that moves the slide forward and backward by rotating,
A transmission shaft that penetrates the inside of the eccentric shaft and is rotatable relative to the eccentric shaft,
The drive mechanism that rotates the transmission shaft and
A speed reducer that slows down the rotation of the transmission shaft and transmits it to the eccentric shaft.
A knockout portion that projects the molded object from the mold and
An energy recovery unit connected to the transmission shaft, recovering the rotational energy of the transmission shaft, and supplying the recovered energy to the knockout unit.
Forging press equipment equipped with. The knockout part is
A knockout pin that protrudes the object to be molded,
It has a cylinder that moves the knockout pin by the hydraulic pressure of the working fluid.
The energy recovery unit applies pressure to the working fluid with the recovered energy.
The forging press device according to claim 1. The knockout part is
A knockout pin that protrudes the object to be molded,
It has an electric drive device that moves the knockout pin, and
The energy recovery unit generates electric power supplied to the electric drive device by the recovered energy.
The forging press device according to claim 1. The energy recovery unit recovers energy during the ascending period of the slide in one molding cycle.
The forging press device according to any one of claims 1 to 3. The energy recovery unit is arranged on the axis extension of the transmission shaft.
The forging press device according to any one of claims 1 to 4. The drive mechanism includes a flywheel and a clutch brake arranged in one axial direction of the transmission shaft.
The energy recovery unit is arranged opposite to the flywheel and the clutch brake with the transmission shaft in between.
The forging press device according to claim 5.

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