JP6561092B2 - Bending roll - Google Patents

Description

  The present invention relates to a bending roll that is bent while a metal plate is reciprocated between an upper roll and a pair of lower rolls.

  The bending roll includes an upper roll and a pair of lower rolls parallel to the upper roll. The metal plate is reciprocated by rotating each lower roll while the metal plate is held between the upper roll and each lower roll. It is a device for bending while moving.

  In a general bending roll, each lower roll is rotationally driven from an electric motor through a speed reducer, but the other operating members are powered by a hydraulic pump driven by another electric motor. It is actuated by the movement of a hydraulic drive member supplied. For example, the upper roll is usually moved up and down by a linear movement of a hydraulic cylinder supplied with hydraulic oil from a hydraulic pump when a metal plate is formed, and by a rotary movement of a hydraulic motor supplied with hydraulic oil from the same hydraulic pump. It moves in the front-rear direction (horizontal direction orthogonal to the axial direction) integrally with the frames on both sides that support the upper roll, and is rotated by another hydraulic motor to prevent slippage with the metal plate (For example, refer to Patent Document 1).

  In addition to the upper roll, one end of the upper roll is rotatably supported, and a frame on one side (hereinafter also referred to as a “falling frame”) that falls over when the formed metal plate is taken out, or a metal plate. A material stopper that stops the metal plate at a predetermined position and moves up to a position that blocks the progress of the metal plate passed between the upper roll and each lower roll before forming so that the hydraulic pump operates as a power source. Often has become.

JP 2001-219225 A

  By the way, in the bending roll as described above, the electric motor that drives the hydraulic pump that is the power source of the operating member other than the lower roll is normally operated at the rated rotation, and the operating member that uses the hydraulic pump as the power source is operated. When not, the hydraulic oil delivered from the hydraulic pump is discharged to the tank by the unload circuit, and the hydraulic oil is not supplied to the hydraulic drive member. For this reason, the power consumption of the electric motor that drives the hydraulic pump is large, and the noise of the electric motor and the hydraulic pump has been a problem.

  Therefore, an object of the present invention is to reduce power consumption and noise of an electric motor that drives a hydraulic pump of a bending roll.

  In order to solve the above-described problems, the present invention includes an upper roll and a pair of lower rolls disposed on both front and rear sides below the upper roll, and holds a metal plate between the upper roll and each lower roll. In this state, in the bending roll which is bent while reciprocating the metal plate by rotationally driving the lower rolls, at least one of the operating members other than the lower rolls is a hydraulic pump driven by an electric motor. Is operated by the movement of a hydraulic drive member supplied with hydraulic oil from the hydraulic pump, and when the operation member using the hydraulic pump as a power source is not operated, the hydraulic drive member from the hydraulic pump Drive the electric motor at a lower rotational speed than when operating the operating member without supplying hydraulic oil to the motor, or stop the electric motor Adopted the configuration in which.

  That is, when not actuating the operating member that uses the hydraulic pump as a power source, by lowering the rotational speed of the electric motor that drives the hydraulic pump than when operating the operating member, or by stopping the electric motor, The electric power consumption and noise are made smaller than when the motor is always operated at the rated speed.

  Here, the operating members other than the respective lower rolls support the upper roll that moves up and down, rotates, or moves back and forth during the molding of the metal plate, and rotatably supports one end of the upper roll. A material that stops the metal plate at a predetermined position by rising to a position that blocks the progress of the metal plate passed between the upper roll and each lower roll before forming the metal plate before the metal plate is formed. At least one of the stoppers is included.

  The electric motor that drives the hydraulic pump is preferably inverter-controlled.

  As described above, in the bending roll according to the present invention, when the operating member using the hydraulic pump as a power source is not operated, the number of rotations of the electric motor that drives the hydraulic pump is made lower than when the operating member is operated. Alternatively, since the electric motor is stopped, power consumption and noise can be reduced as compared with the case where the electric motor is always operated at the rated speed.

Front view of the bending roll of the embodiment Right side view of FIG. Left side view of FIG. Explanatory drawing of metal plate forming work by bending roll of FIG. Schematic explanatory diagram of the material stopper of the bending roll of FIG. The graph which shows the electric power behavior of the electric motor which drives the hydraulic pump of the bending roll of FIG. A graph showing the power behavior of a motor that drives a hydraulic pump of a conventional bending roll

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 3, the bending roll includes an upper roll 1, a pair of lower rolls 2 arranged in parallel with the upper roll 1 on both front and rear sides below the upper roll 1, and each lower roll 2. Two pairs of backup rolls 3 that support the axially central portion from the lower front and rear sides, left and right upper frames 4 and 5 that support both ends of the upper roll 1, and lower frames that support both ends of each lower roll 2 6 is provided. And as shown in FIG. 4, the upper roll 1 is moved to the front-back direction position according to molding conditions, the metal plate A is clamped between the upper roll 1 and each lower roll 2, and each lower roll 2 is bent. In such a state that the lower roll 2 is rotationally driven with the back-up roll 3 corrected, the metal plate A is bent while being reciprocated.

  Each of the upper frames 4 and 5 is formed in a substantially gate shape, and a leg portion between a bearing portion 6 a provided on the upper surface of the lower frame 6 and a support plate 7 fixed to the front and rear surfaces of the lower frame 6. A support shaft 8 is provided between the bearing portion 6a and the front and rear support plates 7 and extends in the front-rear direction. The support shaft 8 is fixed to the bearing portion 6 a and the support plate 7 of the lower frame 6, and the leg portions of the upper frames 4 and 5 are slidable with respect to the support shaft 8.

  Thereby, the upper frame 4 on the left side in FIG. 1 can be moved back and forth, and when the formed metal plate A is taken out, the left upper frame 4 is turned away from one end of the upper roll 1 to the left (falling down). It is a frame. On the other hand, the upper frame 5 on the right side in FIG. 1 cannot move away from the other end of the upper roll 1 because the other end of the upper roll 1 is extended outward in the axial direction. Only possible.

  Further, a hydraulic cylinder 9 is attached to the upper end portions of the upper frames 4 and 5 with the rod 9a facing downward, and the lower end of the rod 9a is attached to a bearing 10 that rotatably supports the end portion of the upper roll 1. The upper roll 1 is moved up and down by the operation of both hydraulic cylinders 9. The rise of the upper roll 1 is regulated by a gate-shaped stopper 11 that is fixed to the lower frame 6 so as to straddle the extended portion 1 a at the other end of the upper roll 1.

  The lower frame 6 has a closed end portion of a two-stage hydraulic cylinder 12 rotatably attached to a lower portion of one end surface thereof. Then, the tip of the second-stage rod 12a of the hydraulic cylinder 12 is rotatably connected to the overturning frame 4, and the overturning / restoring operation of the overturning frame 4 is performed by the hydraulic cylinder 12 extending and contracting while rotating. It has come to be.

  A rectangular parallelepiped motor case 13 is provided on the upper surface of the other end of the lower frame 6. In the motor case 13, the main shaft 14 of the first electric motor is connected to a pulley 16 via a belt 15, and a gear 17 connected to the pulley 16 via a speed reducer (not shown) is connected to each lower roll 2. The lower roll 2 is driven to rotate by the first electric motor, and meshes with a gear 18 fitted and fixed to the outer periphery of the end portion.

  A rectangular parallelepiped pump case 19 is provided on the upper surface of the motor case 13, and a second electric motor 20 that drives a hydraulic pump (not shown) housed in the pump case 19 is installed on the upper surface of the pump case 19. Has been. As the second electric motor 20, an inverter-controlled one is used. The hydraulic pump is connected to a hydraulic motor 21 connected to an extended portion 1 a at the other end of the upper roll 1 and serves as a power source for rotating the upper roll 1.

  Further, a hydraulic motor 23, which is a part of a mechanism for moving up and down a stand 22 that supports both ends of each backup roll 3, is fixed to the lower frame 6 on the front surface of the center portion. A hydraulic motor 24 that is a part of a mechanism for moving the upper frames 4 and 5 integrally with the upper roll 1 back and forth is fixed to the upper surface on the right side of the hydraulic motor 23 for raising and lowering the backup roll 3. .

  Further, as schematically shown in FIG. 5, behind the lower roll 2 on the rear surface side, the progress of the metal plate A passed between the upper roll 1 and each lower roll 2 is blocked before the metal plate A is formed. A material stopper 25 is provided that rises to a position and stops the metal plate A at a predetermined position. The material stopper 25 is raised and lowered by the operation of a hydraulic cylinder (not shown).

  The hydraulic pump driven by the second electric motor 20 is connected to the hydraulic motor 21 for rotating the upper roll 1 as described above, as well as the hydraulic cylinder 9 for raising and lowering the upper roll 1 and the falling frame 4. A hydraulic cylinder 12 for restoration, a hydraulic motor 23 for raising and lowering the backup roll 3, an upper roll 1 (each upper frame 4, 5), a hydraulic motor 24 for moving back and forth, and a material stopper 25. Acting members other than the lower roll 2, that is, a power source for the upper roll 1, the falling frame 4, the backup roll 3, and the material stopper 25.

  A control panel 26 for controlling each operating member including the lower roll 2 is attached to the front side of the motor case 13, and a digital display panel 27 is attached to the upper surface of the right upper frame 5.

  This bending roll has the above-described configuration, and the molding operation is as follows. That is, first, as shown in FIG. 5, the metal plate A is passed between the upper roll 1 and each lower roll 2 with the upper roll 1 and the material stopper 25 raised, and the metal plate A is moved by the material stopper 25. Stop in place. Next, the upper roll 1 and the material stopper 25 are lowered, the metal plate A is held between the upper roll 1 and each lower roll 2, and each lower roll 2 is driven to rotate, whereby the metal plate A is reciprocated. Bend and mold. At the time of bending, the height of the upper roll 1, the position in the front-rear direction, and the height of each backup roll 3 are adjusted according to the molding conditions, and the upper roll 1 is driven to rotate in some cases. And when shaping | molding is completed, rotation of each lower roll 2 (and upper roll 1) will be stopped, the fall frame 4 will be fallen, and the metal plate A will be taken out. Thereafter, the fall frame 4 is raised and restored in preparation for the next molding operation.

  Here, the lower roll 2 is rotationally driven by the first electric motor, but the other operating members (the upper roll 1, the falling frame 4, the backup roll 3, and the material stopper 25) are driven by the second electric motor 20. The hydraulic pump is used as a power source, and the hydraulic pump is operated by the movement of each hydraulic drive member (hydraulic cylinder and hydraulic motor) supplied with hydraulic oil from the hydraulic pump.

  In this embodiment, the second electric motor 20 is always operated. However, when none of the operation members using the hydraulic pump as a power source is operated, the hydraulic oil is supplied from the hydraulic pump to each hydraulic drive member. The rotational speed of the second electric motor 20 is set lower than when one or more operating members are operated in a state where the operation is not performed. Thereby, compared with the case where the electric motor which drives a hydraulic pump is conventionally drive | operated by rated rotation, power consumption can be reduced. In addition, the noise of the electric motor and hydraulic pump during the metal plate forming operation is smaller than before, and the device is environmentally friendly.

  In order to confirm the power consumption reduction effect of the above embodiment, the following experiment was performed. In the experiment, the same metal plate forming operation was performed with the embodiment and the conventional bending roll, the electric energy of the second electric motor that drives the hydraulic pump was measured during the operation, and the measurement results were compared. 6 and 7 show examples of the power behavior of the embodiment and the conventional bending roll, respectively. 6 and 7, the upper roll is moved up and down, moved back and forth, the lower roll is rotated, the fall frame is turned over and restored, and the upper roll is not driven to rotate. Lifting up and down the backup roll is not included in the measurement range.

  As can be seen from the comparison between FIG. 6 and FIG. 7, the apparent power of the embodiment when the operation member other than the lower roll is not operated is considerably lower than the conventional one. And although illustration is abbreviate | omitted, in this example, the integrated electric power of embodiment is about 1/2 of the past, and it was confirmed that power consumption is reduced significantly by this invention.

  In addition, the rotation speed of the 2nd electric motor of embodiment when operating members other than a lower roll are not operated can be set arbitrarily, and the power saving effect of an embodiment becomes large, so that the rotation speed is made small.

  Further, in the above-described embodiment, the rotational speed of the second electric motor is lowered when none of the operating members other than the lower roll is operated, but the second electric motor can also be stopped. In that case, the pressure of the hydraulic pump is monitored by a sensor, and control for driving the second electric motor is performed only when it is sensed that the pressure has dropped below a predetermined value.

  Of course, the present invention can also be applied to a backup roll and a bending roll having no material stopper as in the embodiment.

1 Upper roll 2 Lower roll 3 Backup roll 4 Upper frame (falling frame)
5 Upper frame 6 Lower frame 9, 12 Hydraulic cylinder (hydraulic drive member)
20 Second electric motor 21, 23, 24 Hydraulic motor (hydraulic drive member)
25 Material stopper A Metal plate

Claims (2)

An upper roll and a pair of lower rolls arranged on both front and lower sides of the upper roll, and the first electric motor with each lower roll held in a state where a metal plate is held between the upper roll and each lower roll. In the bending roll that bends and forms while reciprocating the metal plate,
The upper roll uses a hydraulic pump driven by a second electric motor as a power source and is moved up and down by a hydraulic cylinder to which hydraulic oil is supplied from the hydraulic pump, and each lower roll is driven to rotate by the first electric motor. among you are bending the metal plate forming, when not lifting the on rolls, with no supply hydraulic fluid from the hydraulic pump to the hydraulic cylinder, than the rotational speed of when you lift the upper roll A bending roll characterized in that the second electric motor is driven at a lower rotational speed or the second electric motor is stopped. The bending roll according to claim 1, wherein the second electric motor that drives the hydraulic pump is inverter-controlled.

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