JP6159614B2 - Electric servo press machine and its operating method - Google Patents

Description

  The present invention relates to an electric servo press suitable for high-speed operation and an operation method thereof.

  One type of press is an electric servo press. In this electric servo press machine, for example, an electric servo motor is used as a drive source for reciprocating a slide to which a mold is attached. This electric servo press machine is suitable for high-speed press operation because it can reciprocate the slide at high speed and accurately control the movement by controlling the electric servo motor.

  By the way, for the quick transition from the start of the press machine to the press process, when the electric servo press machine is started, the electric servo motor is larger than the torque required during the press process. Torque is required. Therefore, the electric servo motor of the press machine is selected and used so as to exhibit the maximum torque required for starting the press machine (see, for example, Patent Document 1).

  Further, when a large single electric servo motor is used as the drive source to achieve a desired torque, the inertial force of the electric servo motor increases, which may hinder accurate control. Therefore, it has been attempted to reduce the overall inertia force of the electric servo motor by realizing a large torque required at the time of starting the press machine by parallel operation of the two electric servo motors (for example, Patent Document 2).

  Moreover, according to the former prior art, the regenerative electric power energy obtained by the electric servo motor when braking of the press machine is stopped can be stored in the power storage device. However, the braking time during which regenerative power energy is obtained is extremely short compared to the operation time of the press process operation excluding the start-up operation and the braking operation of the press machine. Therefore, the electric power stored in the power storage device by the regenerative power energy is too small to be used as driving energy for an auxiliary device such as a material supply device provided in a press. As a result, the regenerative power energy cannot be substantially used as drive energy for the auxiliary device.

JP 2010-131656 A JP 11-226799 A

  Therefore, an object of the present invention is to reduce the overall inertia force of the electric servo motor of the electric servo press machine and to make efficient use of energy.

  The present invention is directed to an electric servo press that drives a single crankshaft in cooperation with a plurality of electric servomotors. The basic concept of the present invention is as follows.

In the present invention, a plurality of electric servo motors are operated as a drive source for starting the electric servo press, and a predetermined torque necessary for a quick start is applied to the crankshaft in cooperation with the plurality of electric servo motors. Is done. During operation of the press process after startup, the plurality of one also less of the electric servo motor continues to be actuated to impart a torque required to operate the pressing step to the crank shaft while the other, said plurality of At least one other of the electric servomotors is operated as a generator that receives torque from the crankshaft. The electric power generated by this generator is stored in the power storage device. Electrical energy stored in said power storage device is used as the driving energy of the auxiliary devices as the electric servo press machine the work piece supply device provided on the electric servo press machine in order to supply the workpiece to .

More specifically, the operation method of the electric servo press machine according to the present invention, each of at least two electric servo motor operable is the power, the rotational motion of the crank shaft which is rotated by the driving of the electric servo motor An electric servo press including a slide that reciprocates along with the object is intended. In the operation method according to the present invention, the at least two electric servo motors are operated synchronously by the power source for activation of the electric servo press machine, and are necessary at the time of activation jointly by operation of the electric servo motors. A certain torque is applied to the crankshaft, and after starting the electric servo press machine, some of the at least two electric servo motors continue to operate with the power source for the operation of the press process. Thus, a predetermined torque smaller than the torque at the time of start-up is continuously applied to the crankshaft, and other electric servomotors except the part of the at least two electric servomotors are operated by the rotation of the crankshaft. Functioning as a generator, and storing electric power generated by the power generation action in a power storage device, Characterized by utilizing the power stored in the location as a driving energy of the auxiliary devices of the electric servo press machine.

  If necessary, in order to quickly stop braking of the electric servo press in the pressing step, the at least two electric servo motors are operated as regenerative brakes, and the electric servo motors are quickly stopped by regenerative brake operation. The braking torque required for the above can be applied to the crankshaft.

It said at least two electric servo motor may be constituted by two electric servo motor, wherein at least during the starting operation of the electric servo press machine, also at the time of braking for the electric servo press machine as required, of one The electric servo motor may be a master servo motor that is directly controlled by the control circuit, and the other electric servo motor may be a slave servo motor that follows the master servo motor.

An electric servo press according to the present invention includes a crankshaft having a main shaft portion and an eccentric shaft portion, the main shaft portion being rotatably supported by a frame, and the crankshaft rotating around the main shaft portion. a control circuit for each of the rotating shaft to the main shaft portion of the crankshaft to control the first and second electric servo motor which is operatively connected, rotation of the first and second electric servo motor so, A link mechanism that connects the eccentric shaft portion of the crankshaft and the slide to reciprocate the slide toward and away from the bolster as the crankshaft rotates, and an electric servomotor as a drive source, A material conveying device that operates to convey the workpiece between the bolster and the slide in synchronization with the reciprocating motion of the slide, and the electric power of the second electric servo motor and the material conveying device. A power storage device connected to the servo motor, and under the control of the control circuit, the first and second electric servo motors provide the torque required at the start for the start of the electric servo press. The first electric servomotor is operated synchronously to be applied to the crankshaft, and the first electric servomotor is to apply a torque necessary for the operation of the press process to the crankshaft for the operation of the press process of the electric servo press machine. At the same time, the second electric servomotor is operated as a generator that operates by rotation of the crankshaft to store electricity in the power storage device, and the electric servomotor of the material conveying device is stored in the power storage device. It is operated using energy.

  The first and second electric servo motors may be constituted by a pair of electric servo motors in which the respective rotating shafts are coupled to each of both main shaft portions provided at both ends of the crankshaft through coupling. it can.

  Each of the electric servomotors preferably has a rated torque of about 1/3 of the maximum torque required for starting the crankshaft.

Under the control of the control circuit, the first electric servo motor can function as a master servo motor during the start-up operation of the electric servo press. In this case, the second electric servo motor functions as a slave servo motor that follows the first electric servo motor.

  The material conveying device may be a material feeding device that handles a plurality of processed portions of the workpiece in a continuous state.

  Further, the material conveying device can be a transfer feeding device that handles workpieces separated from each other.

In the present invention, when starting the electric servo press machine that requires a larger torque than that during operation of the pressing process, the total torque of each electric servo motor is applied to the crank shaft as a torque required for the start. Is done. Further, during the operation of the press process after startup, the first electric servo motor, which is a part of the plurality of electric servo motors, continues to apply the torque necessary for the press process to the crankshaft. At the same time, during the operation of the pressing process, the second electric servo motor which is the remaining part of the plurality of electric servo motors operates as a generator. Since the operation time of this pressing process is generally extremely long compared to the moment when the start time and the braking time are instantaneous, the power generation action of the second electric servo motor that operates as a power generator. Thus, the power storage device stores enough power to be used as driving energy for the auxiliary device such as the workpiece material supply device.

Therefore, according to the present invention, it is possible to reduce the overall inertia force of the electric servomotor by sharing the drive source of the crankshaft of the electric servo press with the plurality of electric servomotors. In addition to this, it is possible to generate drive energy of a drive source of an accessory device such as a material transport device by a power generation action during a press process operation of the electric servo press by the second electric servo motor. Can be used efficiently.

It is a front sectional view of the electric servo press machine concerning the present invention. It is sectional drawing obtained along line II-II of the electric servo press shown in FIG. It is a left view of the electric servo press shown in FIG. FIG. 2 is a connection diagram schematically showing an electrical connection relationship between an electric servo motor of the electric servo press shown in FIG. 1 and its control system.

  In FIG. 1, an electric servo press according to the present invention is indicated generally by the reference numeral 10. As is well known in the art, the electric servo press machine 10 has a bed 12a having a rectangular plane shape as clearly shown in FIG. 2, and columns 12b rising vertically from the four corners of the bed, A well-known frame 12 having a generally rectangular frame crown 12c supported above and spaced from the bed 12a via the column is included.

  As shown in FIG. 1, a crankshaft 14 extending horizontally across the opposite side walls of the crown is rotatably supported in the crown 12c. In the illustrated example, the crankshaft 14 includes a pair of main shaft portions 14a and 14a constituting both end portions of the crankshaft 14, and a central eccentric shaft portion 14b disposed at the center between the pair of main shaft portions 14a and 14a. And a pair of both-side eccentric shaft portions 14c, 14c disposed on both sides of the central eccentric shaft portion.

  The pair of main shaft portions 14a, 14a are formed so that their axes coincide with each other, and are respectively rotatably supported on the side walls of the crown 12c. The pair of both side eccentric shaft portions 14c, 14c are formed to be eccentric with each other in the same phase with respect to the main shaft portions 14a, 14a. Further, the central eccentric shaft portion 14b is formed to be eccentric with respect to the main shaft portions 14a and 14a with a phase difference of 180 degrees from the both side eccentric shaft portions 14c and 14c.

  A pair of electric servomotors 16 and 18 are supported via brackets 20 on the both side walls of the crown 12c. Each of the electric servomotors 16 and 18 is disposed with the respective rotating shafts 16 a and 18 a protruding toward the corresponding end of the crankshaft 14. Couplings 22 are provided at the outer ends of the pair of main shaft portions 14 a, 14 a constituting both ends of the crankshaft 14, and both ends of the crankshaft 14 correspond to the corresponding electric servomotors via the couplings 22. The rotary shafts 16a and 18b of the 16 and 18 are operatively coupled to each other. Also, a conventionally well-known braking device 24 is provided in relation to the rotating shaft 16a of one electric servomotor 16.

  Each column 12b is formed with a guide portion 30 for guiding the slide 28 in the vertical direction above the bolster 26 disposed on the bed 12a. A pair of plungers 34 are provided on the upper portion of the slide 28 so as to vertically penetrate toward the corresponding pair of eccentric shaft portions 14c, 14c through the through holes 32 formed in the bottom wall portion of the crown 12c. Yes. Each plunger 34 is connected to each of the corresponding eccentric shaft portions 14c and 14c via the link mechanism 36 at the top thereof.

  In the example shown in the figure, the link mechanism 36 is pivotally attached to the opposite eccentric shaft portions 14c, 14c at the upper ends, and the lower ends are connected to the corresponding plungers 34 via pins 38 parallel to the eccentric shaft portion 14c. It consists of a pair of link members called the made connection.

  On the other hand, a well-known balancer weight 42 is pivotally attached via a link member 40 to a central eccentric shaft portion 14b formed in a phase opposite to the pair of both side eccentric shaft portions 14c, 14c.

  As will be described later, when the crankshaft 14 is driven and rotated in one direction around the pair of main shaft portions 14a and 14a by the drive of the pair of electric servomotors 16 and 18, the slide mechanism slides by the motion conversion function of the link mechanism 36. 28 is reciprocated toward and away from the bolster 26. Although not shown, for example, an upper mold and a lower mold constituting a press portion are arranged on the surfaces corresponding to each other of the slide 28 and the bolster 26, respectively.

  As is well known in the art, the balancer weight 42 suppresses vibration due to an unbalanced couple acting on the crankshaft 14 due to the reciprocal motion of the slide 28 accompanying the above-described rotation of the crankshaft 14, The operation of the electric servo press 10 is stabilized.

  A material conveying device 44 for conveying a workpiece is attached to the bed 12a of the frame 12 between the slide 28 and the bolster 26, that is, between the upper mold and the lower mold. The material conveying device 44 includes an electric servomotor 46 that can operate in synchronization with the electric servomotors 16 and 18. As shown in FIG. 2, the electric servo motor 46 is attached to the drive pulley 48 attached to the rotating shaft 46a, and to the main drive shaft 44a of the material conveying device 44 as shown in FIG. A driving force is applied to the main drive shaft 44a through a timing belt 52 that goes around the driven pulley 50. Thereby, the electric servo motor 46 acts as a drive source for the material conveying device 44.

  The material conveyance device 44 is a material conveyance device that continuously handles a plurality of workpiece portions of the workpiece by, for example, continuously feeding a coil-like workpiece in synchronization with the operation of the slide 28. . This type of material conveying device is generally suitable for use as a primary processing feeder. Instead of this, the material conveying device 44 is a transfer feeding device that handles the separated workpieces by conveying the separated workpieces continuously in synchronization with the operation of the slide 28. can do. This transfer feeder is generally used as a secondary processing feeder.

  As a representative example of the material conveying device 44 that handles continuous workpieces, there is a gripper feeding device including a movable gripper and a stationary gripper as described in, for example, Japanese Patent Application Laid-Open No. 2011-88193. Moreover, as a typical example of a transfer feeding apparatus that handles workpieces separated from each other, there is a transfer feeding apparatus described in, for example, Japanese Patent Application Laid-Open No. 2003-33833.

  As is well known in the art, all of the material conveying devices 44 described above have their main drive shaft 44a driven and rotated in synchronism with the reciprocating motion of the slide 28, so that the work material is moved to the upper mold and the lower mold. It is supplied between the slide 28 and the bolster 26 so as to be sequentially subjected to proper processing in the press section such as a mold.

  The electric circuit of the electric servo press 10 is schematically shown in FIG. Servo amplifiers 54, 56 and 58 serving as drive circuits are connected to the electric servomotors 16, 18 and 46, respectively.

  In other words, the first electric servomotor 16 that is one of the pair of electric servomotors 16 and 18 is connected to a servo amplifier 54 that receives rotation information of the rotary shaft 16a. A servo amplifier 56 is connected to the second electric servomotor 18, which is the other of the pair of electric servomotors 16, 18, for receiving rotation information of the rotation shaft 18a. A servo amplifier 58 is connected to the third electric servo motor 46, which is an electric servo motor of the material conveying device 44, for receiving rotation information of the rotary shaft 46a. Each servomotor 16, 18 and 46 can be rotated under the control of the control circuit 60 based on the rotation information from the respective encoders 16a, 16b and 46b by the power from the AC power supply 62 in the illustrated example.

  Each of the servo amplifiers 54, 56 and 58 is appropriately incorporated with an AC / DC and DC / AC converter depending on whether an alternating current or a direct current is used as the power source 62, as is well known. Yes.

  In addition, power is generated between the servo amplifier 56 of the second electric servomotor 18 and the servo amplifier 58 of the third electric servomotor 46 when the second electric servomotor 18 operates as a generator, as will be described later. A power storage device 64 is connected to store the stored power and supply the stored power to the third electric servo motor 46 via the servo amplifier 58.

  The control circuit 60 supplies the first and second electric servo motors 16 and 18 to give the crankshaft 14 with the torque necessary for the activation via the servo amplifiers 54 and 56 for the activation of the electric servo press 10. Operate in one direction synchronously. In order to quickly shift to the pressing process after the startup, a torque larger than the torque required in the pressing process is applied.

  In order to apply a torque larger than the torque required in this pressing process, the first and second electric servomotors 16 and 18 have a phase exceeding, for example, about half the torque value n required for quick start-up. A pair of electric servomotors 16, 18 having equal rated torque is used. Therefore, when the electric servo press 10 is started, an appropriate driving torque can be applied to the crankshaft 14 by driving both the electric servomotors 16 and 18, and the electric servo press 10 can be quickly transferred to the pressing process. Can do.

  Thus, when operating both the electric servomotors 16 and 18 in synchronization, the first electric servomotor 16 is caused to function as a master servomotor, and the second electric servomotor 18 is driven by the first electric servomotor 16. In order to simplify the configuration of the control system, it is desirable to function as a slave servo motor.

  When the electric servo press 10 shifts to the pressing process, the control circuit 60 continues to apply the torque necessary for maintaining the pressing process by the first electric servo motor 16 to the crankshaft 14. Continue to operate. In this pressing process, the crankshaft 14 requires only a very small torque compared to the above-described startup. Accordingly, when the process proceeds to the pressing step, the second electric servomotor 18 is operated as a generator by the rotation of the crankshaft 14 under the control of the control circuit 60.

  In this case, a part of the torque of the first electric servomotor 16 is consumed by the rotation of the generator 18, but the electric servomotor can generally be operated to exhibit about three times the rated torque. Therefore, the control circuit 60 controls the rotation of the first electric servomotor 16 so that a torque necessary for performing an appropriate pressing process can be applied to the crankshaft 14 within a controllable range. The electric power generated by the power generation action by the operation of the second electric servo motor 18 during the pressing process is stored in the power storage device 64.

  During the pressing process described above, the third electric servo motor 46 of the material conveying device 44 operates to supply the workpiece to the pressing unit with the electric power stored in the power storage device 64 under the control of the control circuit 60. Is done. However, when the third electric servo motor 46 cannot be operated properly only by the electric power stored in the power storage device 64, the control circuit 60 uses the electric power from the power source 62 as an auxiliary to the third electric servo motor 46. The motor 46 is activated.

  Further, when the braking of the electric servo press 10 is stopped, the braking device 24 is operated, but for more effective braking, the control circuit 60 may include both the first and second electric servomotors 16 as necessary. , 18 are operated as a regenerative brake. By this regenerative braking operation, the two electric servomotors 16 and 18 jointly apply a braking torque having a larger value to the crankshaft 14 as compared with the torque during the pressing process described above. Therefore, when braking of the electric servo press 10 is stopped, the electric servo press 10 can be braked only by the braking force of the braking device 24. However, as described above, the synchronized regeneration of both the electric servo motors 16 and 18 during braking. Brake torque can be applied to the crankshaft 14 by the brake operation, which makes it possible to shift more quickly due to the stopped state of the electric servo press machine 10 than when the brake device 24 alone is braked.

  In the electric servo press 10 according to the present invention, as described above, when the electric servo press 10 which requires a larger rotational torque than the operation of the press process is started, The total rotational torque of each electric servo motor is applied as a torque necessary for starting the crankshaft 14. Further, during the operation of the pressing process after startup, the first electric servomotor 16 that is a part of the plurality of electric servomotors 16 and 18 continues to apply the rotational torque necessary for the pressing process to the crankshaft 14. At the same time, during the operation of the pressing process, the second electric servo motor 18 which is the remaining part of the plurality of electric servo motors 16 and 18 operates as a generator.

  Since the operation time of this pressing process is generally extremely long compared to the start time and the braking time, the power generation action of the second electric servo motor 18 operating as a generator The power storage device 64 stores sufficient power to be used as drive energy for the workpiece supply device 44.

  Therefore, according to the electric servo press machine 10 according to the present invention, the drive force of the crankshaft 14 of the press machine 10 is shared by the plurality of electric servo motors 16 and 18, so that the overall inertia force of the electric servo motor is increased. Can be reduced. In addition to this, a drive source of an accessory device such as the material conveying device 44 is generated by the power generation action during the press process operation of the press 10 by the second electric servomotor 18 of the plurality of electric servomotors 16, 18. The driving energy for 46 can be generated, and the energy can be used efficiently.

  When the braking is stopped, the second electric servo motor 18 connected to the power storage device 64 can be operated as a generator instead of applying reverse torque from the second electric servo motor 18 to the crankshaft 14. it can.

  In the above description, the electric power stored in the power storage device 64 is used as driving energy for an auxiliary device such as a workpiece material supply device. The power storage device 64 can be used as a power source for various auxiliary devices added to the press 10.

  The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention. For example, an example in which both electric servomotors 16 and 18 are operatively coupled to the crankshaft 14 via the coupling 22 is shown. Alternatively, a plurality of first electric servomotors 16 or a plurality of second electric servomotors 18 can be operatively coupled to the crankshaft 14 via, for example, pulleys and timing belts.

DESCRIPTION OF SYMBOLS 10 Electric servo press machine 12 Frame 14 Crankshaft 14a, 14a Main shaft part of crankshaft 14c Eccentric shaft part of crankshaft 16, 18 A pair of electric servomotors 22 Coupling 26 Bolster 28 Slide 36 Link mechanism 44 Material conveying device (auxiliary device) )
46 Electric Servo Motor of Material Transfer Device 60 Control Circuit 62 AC Power Supply 64 Power Storage Device

Claims (12)

Operation of an electric servo press machine including at least two electric servo motors each operable by a power source, and a slide that reciprocates with the rotational movement of a single crankshaft driven and rotated by driving of the electric servo motor A method,
For the activation of the electric servo press machine, the at least two electric servo motors are operated synchronously by the power source, and a torque required at the time of activation is given to the crankshaft by the operation of the electric servo motors;
After starting the electric servo press machine, for the operation of the pressing process, the electric servo motor of some of the at least two electric servo motors is continuously operated by the power source and the torque at the time of starting the crankshaft A predetermined torque smaller than that of the electric servomotor, and the other electric servomotors excluding the part of the at least two electric servomotors function as a generator that operates by rotation of the crankshaft. Storing the generated power in a power storage device,
An electric servo press machine operating method, wherein the electric power stored in the power storage device is used as operating energy of an auxiliary device of the electric servo press machine.   Further, in order to stop the pressing process, the at least two electric servo motors are operated as regenerative brakes, and a braking torque necessary for quick stop is applied to the crankshaft by regenerative brake operation of the electric servo motors. The driving | running method of Claim 1 containing these.   The at least two electric servo motors are two electric servo motors, and during the start-up operation of the electric servo press, one of the electric servo motors functions as a master servo motor that is directly controlled by a control circuit. The operation method according to claim 1, wherein the other electric servomotor functions as a slave servomotor driven by the master servomotor.   The auxiliary device has an electric servo motor that is operated by the electric power of the power storage device and is operated in synchronization with the operation of the electric servo press as a drive source, and the workpiece is activated by the operation of the electric servo motor. The operation method according to claim 1, which is a material conveying device that continuously supplies the material.   The operation method according to claim 4, wherein the material conveying device is a material feeding device that handles a plurality of parts to be processed in a continuous state.   The operation method according to claim 4, wherein the material conveying device is a transfer feeding device that handles workpieces separated from each other. A crankshaft having a main shaft portion and an eccentric shaft portion, the main shaft portion being rotatably supported by a frame, and the main shaft portion of the crankshaft to rotate the crankshaft around the main shaft portion, respectively. first and second electric servo motor rotating shaft is operatively connected to a control circuit for controlling the rotation of said first and second electric servo motor, the slide with the rotation movement of the crank shaft A link mechanism that connects the eccentric shaft portion of the crankshaft and the slide to reciprocate in a direction toward and away from the bolster, and an electric servo motor as a drive source, and is processed in synchronization with the reciprocating motion of the slide A power storage device connected to a material transfer device that operates to transfer a material between the bolster and the slide, the second electric servo motor, and the electric servo motor of the material transfer device; The door a including electric servo press machine,
Under the control of the control circuit, in order to start the electric servo press, the first and second electric servo motors are operated in synchronism so as to apply a torque necessary for starting to the crankshaft, For the operation of the press process of the electric servo press machine, the first electric servo motor is operated to apply a torque necessary for the operation of the press process to the crankshaft, and at the same time, the second electric servo motor is Actuated as a generator that operates by the rotational force of the crankshaft to store power in the power storage device,
An electric servo press machine in which an electric servo motor of the material conveying device is operated using electric energy stored in the power storage device.   The said 1st and 2nd electric servomotor consists of a pair of electric servomotor by which each said rotating shaft was couple | bonded via the coupling with each of the both main shaft parts provided in the both ends of the said crankshaft. 7. The electric servo press machine according to 7.   9. The electric servo press according to claim 8, wherein each of the electric servo motors has a rated torque of about 1/3 of a maximum torque required for starting the crankshaft.   Under the control of the control circuit, during the start-up operation of the electric servo press machine, the first electric servo motor functions as a master servo motor, and the second electric servo motor serves as the first electric servo motor. The electric servo press according to claim 8, which functions as a slave servo motor to be driven.   The electric servo press according to claim 7, wherein the material conveying device is a material feeding device that handles a plurality of processed portions of a processed material in a continuous state.   The electric servo press according to claim 7, wherein the material conveying device is a transfer feeding device that handles workpieces separated from each other.

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