EP3427854B1 - Presse-plieuse utilisant un mécanisme d'augmentation de force - Google Patents

Presse-plieuse utilisant un mécanisme d'augmentation de force Download PDF

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Publication number
EP3427854B1
EP3427854B1 EP17763132.2A EP17763132A EP3427854B1 EP 3427854 B1 EP3427854 B1 EP 3427854B1 EP 17763132 A EP17763132 A EP 17763132A EP 3427854 B1 EP3427854 B1 EP 3427854B1
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EP
European Patent Office
Prior art keywords
eccentric shaft
press brake
force
actuator
lower table
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP17763132.2A
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German (de)
English (en)
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EP3427854A1 (fr
EP3427854A4 (fr
Inventor
Taishi Suzuki
Makoto Aoki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Amada Co Ltd
Original Assignee
Amada Holdings Co Ltd
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Publication date
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Publication of EP3427854A4 publication Critical patent/EP3427854A4/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • B30B15/24—Control arrangements for fluid-driven presses controlling the movement of a plurality of actuating members to maintain parallel movement of the platen or press beam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • B21D5/0272—Deflection compensating means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/02—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by lever mechanism
    • B30B1/06—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by lever mechanism operated by cams, eccentrics, or cranks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/10—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by toggle mechanism
    • B30B1/14—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by toggle mechanism operated by cams, eccentrics, or cranks

Definitions

  • the present invention relates to a press brake, and in further detail, relates to a press brake in which, at a time of performing a crowning of a lower table by rotating an eccentric shaft, the crowning is performed by rotating said eccentric shaft with a force increased by a force-increasing mechanism (servo mechanism).
  • the press brake is equipped with C-shaped left and right side frames. On a lower front side of the side frames, a lower table is provided. Then, on an upper front side of the side frames, an upper table facing with the lower table is provided to be freely movable up or down.
  • a plate shaped workpiece is mounted and positioned on a lower mold installed on said lower table. Then, by pressing said workpiece by an upper mold provided in the upper table, a bending processing of the workpiece is carried out by a cooperation of the upper and lower molds.
  • both end sides in left and right of the lower table are fixed to the left and right side frames, and both end sides in left and right of the upper table are supported to be freely movable up or down on said side frames. Consequently, due to a reaction force at a time of carrying out the bending processing of the workpiece, the central portions of the upper and lower tables have a tendency to be curved in directions for mutually separating. Therefore, when the bending processing of the workpiece is carried out, a bending angle in vicinity of the central portion of the workpiece becomes looser (larger) than bending angles in vicinity of the both end portions in left and right, and the workpiece becomes vessel shaped.
  • curving the central portion of the lower table in an upper direction in correspondence to the curving of the upper table in the upper direction, so as to maintain the curving of the upper and lower tables to be parallel, i.e., the crowning, has been performed.
  • Curving the central portion of the lower table in the upper direction will require a large force, so that a hydraulic cylinder has been used as an actuator.
  • a configuration described in said Patent Documents 1 and 2 is a configuration in which an output shaft of a motor and an eccentric shaft are directly coupled via a coupling. Consequently, a large size motor is used as the motor, and there has been a desire for downsizing the motor in order to realize an energy saving and a compactness of the overall configuration.
  • the present invention has been made in view of the problems as described above, and its object is to provide a press brake capable of realizing a downsizing and a compactness of an actuator, and capable of realizing an energy saving.
  • each lever member is integrally provided with each eccentric shaft which is provided to be extended in a direction intersecting with respect to left and right shaft centers of each eccentric shaft, and each link member with a tip end portion pivotally connected to a tip end portion of said each lever member, in which a pivotally connected base end portion side of said each link member in a direction intersecting with respect to a longitudinal direction of each link member is pushed or pulled by said actuator.
  • each eccentric shaft in left and right is respectively equipped with a plurality of eccentric shafts arranged in parallel in a left-right direction, and the plurality of eccentric shafts provided to be arranged in parallel and configured to be rotated in an identical direction synchronously.
  • a press brake wherein the left and right eccentric shaft mechanisms are provided with intervals in a left-right direction, and a force-increasing mechanism is provided individually between said each actuator and said each eccentric shaft mechanism, so as to operate said each eccentric shaft mechanism individually.
  • said eccentric shaft is equipped with a plurality of eccentric shafts arranged in parallel in a left-right direction
  • said toggle mechanism is equipped with a tip end portion of each link member pivotally connected to a tip end portion of each lever member that is integrally provided with each eccentric shaft provided to be arranged in parallel, in which a pivotally connected base end side portion of said each link member is pushed or pulled by said actuator.
  • said actuator is a servo motor
  • a member to push or pull the pivotally connected portion of said each link member is a ball nut screwed to be freely reciprocating with a ball screw to be rotated by said servo motor.
  • said ball screw is arranged within a plane parallel to a plate surface of the lower table, and a rotational axis of the servo motor is arranged within a plane parallel to a plate surface of said lower table.
  • said press brake wherein the left and right eccentric shafts for performing a crowning of said lower table are provided to be freely rotatable on said lower table, both end sides of a freely expansion operable connection member are provided to be connected to free end sides in each force-increasing link mechanism with a base end side connected to said left and right eccentric shafts, and an actuator for performing an expansion or contraction operation of said connection member is provided at said connection member.
  • connection member is equipped with ball screw mechanisms at both end sides, and equipped with actuators for operating the ball screw mechanisms on both end sides individually.
  • said force-increasing link mechanism is equipped with a tip end portion of each link member pivotally connected to a tip end portion of a respective lever member with a base end portion connected to each eccentric shaft provided adjacently, one link member in said each link member is provided to be longer than another link member, a base end portion side of another link member is provided to be pivotally connected at a middle position in said one link member, and an end portion of said connection member is connected to a base end portion side in said one link member.
  • said press brake wherein the left and right eccentric shafts for performing a crowning of said lower table are provided to be freely rotatable on said lower table, a force-increasing mechanism for transmitting an output of an actuator to said each eccentric shaft with a force increased is provided between the actuator for rotating said each eccentric shaft and said eccentric shaft, and a biasing means for assisting an operation of said actuator when said eccentric shaft is rotated by said actuator is provided.
  • said press brake wherein the both end sides of a freely expandable connection member are provided to be connected to free end sides in each force-increasing link mechanism with a base end side connected to said left and right eccentric shafts, the connection member is equipped with ball screw mechanisms at both end sides of this connection member, actuators for operating the ball screw mechanisms at the both end sides individually are provided, and a biasing means for assisting an operation of each actuator when said each force-increasing link mechanism is operated by said each actuator is provided.
  • said press brake wherein the left and right eccentric shafts for performing a crowning of said lower table are provided to be freely rotatable on said lower table, both end sides of a freely expandable connection member are provided to be connected to free end sides in each force-increasing link mechanism with a base end side connected to said left and right eccentric shafts, actuators for rotating ball screw mechanisms provided at this connection member are provided at said connection member, and a biasing means for assisting operations of said actuators when said each force-increasing link mechanism is operated by said actuators via said connection member is provided at each force-increasing link mechanism.
  • said biasing means is a compression spring.
  • the force-increasing mechanism is interposed between the actuator for rotating the eccentric shaft and the eccentric shaft, and the output of the actuator is transmitted with a force increased. Consequently, it is possible to provide a press brake capable of realizing a downsizing and a compactness of an actuator, and capable of realizing an energy saving.
  • a press brake 1 is equipped with C-shaped left and right side frames 3L and 3R on both sides in a left-right direction (X-axis direction).
  • a plate shaped lower table 5 On a lower front side of these side frames 3L and 3R, both end sides in left and right of a plate shaped lower table 5 are supported.
  • both end sides in left and right of an upper table 7 as a ram are supported to be freely movable up or down.
  • ram lifting and lowering operation devices 9L and 9R configured from a hydraulic cylinder, a ball screw mechanism and the like, for example, are installed.
  • a plate shaped workpiece is mounted and positioned on a lower mold (omitted to be shown in the figure) installed on the lower table 5. Then, the workpiece is pressed by lowering an upper mold (omitted to be shown in the figure) installed on the upper table 7. In this way, when the workpiece is pressed, the bending processing of the workpiece is carried out by a cooperation of the upper and lower molds.
  • said lower table 5 is attached to the lower front side of said side frames 3L and 3R via bolts and the like (omitted to be shown in the figure). Then, on a front and a back of said lower table 5, a front plate 11 and a back plate 13 are provided. Said front plate 11 and back plate 13 of the lower table 5 are integrally provided via left and right pivots 15L and 15R that are piercing through them respectively in a front-back direction.
  • said eccentric shaft units 19L and 19R are provided, as shown in Fig. 3 , with front and back bearing blocks 21F and 21B separated in front and back for which movements in an up-down direction are regulated within the piercing holes 17L and 17R in said front plate 11 and back plate 13.
  • plate thicknesses of the front and back bearing blocks 21F and 21B are thicknesses nearly equal to plate thicknesses of said front plate 11 and back plate 13.
  • an interval in the front-back direction is provided to be nearly equal to an interval in the front-back direction between said front plate 11 and back plate 13.
  • both end sides in front and back of a pair of left and right eccentric shafts 23 in an identical configuration are supported to be freely rotatable.
  • bearing flanges 25 are provided respectively, and both end sides in front and back of the eccentric shaft 23 are supported to be freely rotatable on these bearing flanges 25. Then, between the front and back bearing flanges 25, an eccentric portion 23E of a large diameter is provided in said eccentric shaft 23. On this eccentric portion 23E, a lifting and lowering block 29 is supported via a plurality of bearings 27.
  • Said lifting and lowering block 29 is arranged to be capable of moving up or down between the front and back bearing blocks 21F and 21B. Then, on an upper side of the lifting and lowering block 29, a pressing plate 29A for pressing an upper side in the piercing holes 17L and 17R formed on the lower table 5 is provided. Note that said lifting and lowering block 29 has its rotation regulated so as not to follow at a time of the rotation of the eccentric shaft 23. Then, between a lower side of said lifting and lowering block 29 and a lower side of the piercing holes 17L and 17R in the lower table 5, a clearance for permitting the lower table 5 to move up or down by the rotation of said eccentric shaft 23 is provided.
  • each lifting and lowering block 29 will be moving up or down with respect to the front and back bearing blocks 21F and 21B.
  • the bearing blocks 21F and 21B in the eccentric shaft units 19L and 19R are in a state of having an up and down movement regulated by the front plate 11 and the back plate 13, so that at a time of the up movement of said lifting and lowering block 29, the lower table 5 will be pressed in the upper direction with respect to the front plate 11 and the back plate 13. Namely, the crowning operation will be performed.
  • said eccentric shaft units 19L and 19R are in a configuration equipped with a plurality of eccentric shafts 23, so that a load at a time of performing the crowning by pressing the lower table 5 in the upper direction is shared by each eccentric shaft 23. Consequently, comparing to the case of using a single configuration for the eccentric shaft, it is possible to make each eccentric shaft 23 thinner, so that it is possible to realize a compactness by suppressing a height dimension in the up-down direction.
  • the left and right eccentric shaft units 19L and 19R provided within the left and right piercing holes 17L and 17R will have their operation directions to be mutually reverse directions in a left and right symmetric configuration.
  • an actuation device (actuator) 31 is provided on a back side of said back plate 13. More specifically, on the back side of said back plate 13, a support bracket 33 is attached, and on this support bracket 33, a servo motor 35 is installed. Also, on said support bracket 33, a ball screw 37 to be rotated by said servo motor 35 is provided to be vertical and freely rotatable. Then, on this ball screw 37, a nut member 39 is screwed to be freely movable up or down. Consequently, when said servo motor 35 is forwardly or reversely rotated, the ball screw 37 is forwardly or reversely rotated, and the nut member 39 is moved up or down.
  • force-increasing mechanisms 41L and 41R are provided between said actuation device 31 and each eccentric shaft 23 between said actuation device 31 and each eccentric shaft 23.
  • This force-increasing mechanism 41 has a function for transmitting the output of said actuation device 31 to said each eccentric shaft 23 with a force increased, and in the present embodiment, it is configured from a toggle mechanism, which is configured as follows.
  • a base end portion of a long lever member 43 extended in a direction intersecting (orthogonal) with respect to an axial center of each eccentric shaft 23 is fixed integrally.
  • a tip end portion of said each lever member 43 in respective eccentric units 19L and 19R is pivotally connected to a connection member 47 via a hinge pin 45.
  • tip end portions of respective lever members 43 are pivotally connected with each other via the connection member 47.
  • respective lever members 43 in the left and right eccentric shaft units 19L and 19R are rotated. Consequently, respective eccentric shafts 23 in the left and right eccentric shaft units 19L and 19R are rotated in respectively reverse directions synchronously. In this way, when each eccentric shaft 23 is rotated, each eccentric portion 23E in each eccentric shaft 23 is gradually lifted from a lowered position. Thus, the crowning is performed as the lower table 5 is pressed in the upper direction by the pressing plate 29A provided at each lifting and lowering block 29 in the left and right eccentric shaft units 19L and 19R.
  • said eccentric shafts 23 are rotated via the force-increasing mechanisms 41L and 41R configured from toggle mechanisms. Consequently, when the eccentric shafts are rotated, they are rotated by increasing force of the output of said actuation device 31.
  • the actuation device (actuator) for moving up or down (pushing or pulling) said push and pull member 53 is not to be limited to the above described configuration, and it is also possible to use the fluid pressure cylinder and the like, for example.
  • the left and right eccentric shaft units 55L and 55R corresponding to the left and right eccentric shaft units 19L and 19R described above are internally installed in said piercing holes 17L and 17R, similarly as said eccentric shaft units 19L and 19R.
  • left and right eccentric shafts 57L and 57R corresponding to said eccentric shafts 23 are respectively provided.
  • These eccentric shafts 57L and 57R differ from the configuration of the eccentric shaft units 19L and 19R described above in that they are configured to be left-right symmetric, and that they are configured to be rotated in mutually reverse directions. However, the remaining configuration is identical in configuration and identical in function, so that the explanation about details of the eccentric shaft units 55L and 55R will be omitted.
  • a configuration of an actuation device (actuator) 69 for moving said push and pull member 67 up or down is a similar configuration as the actuation device 31 described above, so that constituent elements for realizing identical functions will be given the identical reference numerals and the overlapping explanation will be omitted.
  • the nut member 39 and the push and pull member 67 are integrally connected via a connection rod 71.
  • the lever members 59L and 59R and the link members 61L and 61R for rotating a pair of left and right eccentric shafts 57L and 57R in the left and right eccentric shaft units 55L and 55R constitute toggle mechanisms 73L and 73R as an example of the force-increasing mechanism. Consequently, when the servo motors 35 in the left and right actuation devices 69 are driven and the ball screw 37 are rotated forwardly or reversely, the nut member 39 is moved up or down. Thus, the link members 61L and 61R are pushed or pulled via the push and pull member 67.
  • actuation devices 69 for actuating the left and right eccentric shaft units 55L and 55R are provided individually. Consequently, it is possible to actuate the left and right eccentric shaft units 55L and 55R individually. Namely, it is possible to perform the crowning on left side and on right side individually in the lower table 5.
  • a configuration of the force-increasing mechanism (servo mechanism) to be a configuration for rotating the eccentric shaft via a lever crank mechanism utilizing "leverage", for example.
  • a location for providing said actuator is not to be limited to the back plate, and it is also possible to be the front plate. Moreover, it is also possible to be a part of the frames such as the left and right side frames.
  • Fig. 6 shows a configuration of a force-increasing (servo) mechanism of the third embodiment, for rotating the eccentric shafts provided in the eccentric shaft units.
  • servo force-increasing
  • the eccentric shaft units 55L and 55R are arranged within the piercing holes 17L and 17R formed on the front plate 11, the lower table 5 and the back plate 13, the eccentric shaft units 55L and 55R are arranged. Then, on the left and right eccentric shafts 57L and 57R provided in these eccentric shaft units 55L and 55R (see Fig. 7(b) ), the base end portions of the lever members 59L and 59R that constitute parts of the long toggle mechanisms 73L and 73R that are the force-increasing mechanisms are attached integrally.
  • the tip end portions of the link members 61L and 61R are pivotally connected via the hinge pins 63.
  • the link member 61R on one side is configured to be longer than the link member 61L on the other side.
  • the base end portion in the link member 61L on the other side is pivotally connected to a middle position of the link member 61R on one side via a pivot 81.
  • the lever members 59L and 59R and the link members 61L and 61R constitute force-increasing link mechanisms (the toggle mechanisms 73L and 73R). Then, to the tip end portions (free end portions) of the left and right link members 61R in the left and right force-increasing link mechanisms, both end portions of a freely expandable connection member 83 for rotating the eccentric shafts 57L and 57R via the force-increasing link mechanisms are pivotally connected via pivots 85.
  • connection member 83 described above is divided into a first connection portion 83A provided with a ball screw 87 to be freely rotatable, and a second connection portion 83B provided with a ball nut 89 screwed with said ball screw 87. Then, on said first connection portion 83A, a servo motor 91 for rotating said ball screw 87 is provided.
  • Fig. 8 shows the fourth embodiment for rotating the eccentric shafts provided in the eccentric shaft units.
  • this embodiment is a configuration in which the connection member 83 for actuating the left and right eccentric shaft units 55L and 55R via the left and right toggle mechanisms 73L and 73R is divided into three.
  • Fig. 9 shows the fifth embodiment.
  • this fifth embodiment it is a configuration in which the left and right eccentric shaft units 55L and 55R provided within the left and right piercing holes 17L and 17R formed through the front plate 11, the lower table 5 and the back plate 13 are actuated individually by the left and right toggle mechanisms 93L and 93R.
  • the left and right toggle mechanisms 93L and 93R are in configurations which are identical or left-right symmetric, a configuration of the toggle mechanism 93L on one side will be explained, and an explanation will be omitted for a configuration of the toggle mechanism 93R on the other side. Also, those constituent elements for realizing identical functions as the constituent elements in the embodiments described above will be given the identical reference numerals and the overlapping explanation will be omitted.
  • the left and right eccentric shafts 57L and 57R are provided (see Fig. 11 ), and to these eccentric shafts 57L and 57R, the base end portions of the lever members 59L and 59R are attached.
  • tip end portions of T-shaped link members 95L and 95R are pivotally connected via the hinge pins 63 (see Fig. 13 ). Then, base end portions of the link members 95L and 95R described above are pivotally connected to the push and pull member 67 via the pivot 65.
  • the push and pull member 67 described above is moved up or down by the servo motor 35 attached to the back plate 13. Namely, said servo motor 35 is supported by the support bracket 33 attached to the back side of said back plate 13. Then, to said support bracket 33, the ball screw 37 to be rotated by the servo motor 35 is supported vertically and to be freely rotatable. With this ball screw 37, the nut member 39 integrally connected to said push and pull member 67 is screwed to be freely movable up or down.
  • the push and pull member 67 will be moved up or down via the nut member 39.
  • the eccentric shafts 57L and 57R in the eccentric shaft unit 55L are rotated via the toggle mechanism 93L configured from the link members 95L and 95R and the lever members 59L and 59R.
  • the eccentric shafts 57L and 57R are rotated by said servo motor 35 as an actuator.
  • a biasing means for assisting the operation of said servo motor 35 is provided.
  • end portion plates 99 are provided on sides in the left-right direction of said link members 95L and 95R. These end portion plates 99 are integrally provided on both end portions of a plurality of guide rods 97 that are long in the left-right direction. In a middle position in the left-right direction of said guide rods 97, left and right slide plates 101 with L-shape in cross section that are freely moving closer or apart are supported to be freely movable.
  • coil springs 103 are installed between said end portion plates 99 and said slide plates 101. These coil springs 103 constitute the biasing means for assisting the operation of said servo motor 35. Namely, the coil springs 103 are already compressed, and always functioning in a direction for moving the left and right slide plates 101 closer to each other.
  • seating plates 105 are respectively provided on portions of the hinge pins 63 described above. Then, between these seating plates 105, a plurality of coil springs 107 as the biasing means are installed.
  • respective coil springs 103 assist the left and right slide plates 101 by pressing in a direction of moving closer to each other.
  • the coil springs 107 assist the left and right hinge pints 63 in a direction of moving apart.
  • the respective coil springs 103 and 107 as the biasing means are going to assist the driving of the servo motor 35 at a time of performing the crowning of the lower table 5. Consequently, it is possible to realize the downsizing of the servo motor 35, and it is possible to realize the energy saving. Also, in said configuration, the left and right eccentric shaft units 55L and 55R can be actuated individually. Therefore, in the case of carrying out the step bending of the workpiece by changing a position in the left-right direction of the lower table 5, it is possible to perform the crowning of the lower table 5 in correspondence to each bending processing position.
  • Fig. 14 shows the sixth embodiment, which does not fall under the scope of protection of the claims and do not form part of the invention.
  • This embodiment corresponds to a combination of the embodiment described above and shown in Figs. 9 to 13 and the embodiment of the connection member 83 in the embodiment shown in Fig. 8 . Consequently, constituent elements for realizing identical functions will be given the identical reference numerals and the overlapping explanation will be omitted.
  • this sixth embodiment it is a configuration in which the left and right toggle mechanisms 93L and 93R are operated to be interlocking. Namely, in this sixth embodiment, the servo motor 35 in the embodiment shown in Fig. 9 is omitted. Then, in the link member 95L in the toggle mechanisms 93L and 93R, the arm portion 95LA is formed to be largely protruding in an upper direction from a portion of the pivot 102, as shown in Fig. 15 . In the configuration described above, it is a configuration in which the connection member 83 according to the embodiment shown in Fig. 8 is provided at the left and right arm portions 95LA.
  • the plurality of coil springs 103 and 107 are going to be assisting the operation of the servo motor 91, so that the similar effect as described above can be realized.
  • Fig. 18 to Fig. 21 show the seventh embodiment, which does not fall under the scope of protection of the claims and do not form part of the invention.
  • this seventh embodiment it is a configuration in which the coil springs as the biasing means are provided on the left and right toggle mechanisms 93L and 93R, and the left and right toggle mechanisms 93L and 93R are operated to be interlocking by a single servo motor.
  • the toggle mechanisms 93L and 93R are such that the lever members 59L and 59R are attached to the respective eccentric shafts 57L and 57R in the left and right eccentric shaft units 55L and 55R (see Fig. 21 ), similarly as the configuration described above. Then, to said respective lever members 59L and 59R, the link members 61L and 61R are pivotally connected respectively via the hinge pins 63. The respective link members 61L and 61R described above are pivotally connected via the pivot 65. With the configuration described above, the toggle mechanisms 93L and 93R are configured by the respective lever members 59L and 59R and link members 61L and 61R.
  • connection member 83 is pivotally connected. Consequently, by expanding or contracting and actuating the connection member 83 as the ball screw 87 is rotated forwardly or reversely by the servo motor 91 provided on the connection member 83, the both toggle mechanisms 93L and 93R are actuated to be interlocking. Therefore, the crowning will be performed as the eccentric shafts 57L and 57R in the left and right eccentric shaft units 55L and 55R are rotated simultaneously in interlocked manner.
  • the biasing means for assisting the rotations of the eccentric shafts 57L and 57R at a time of performing the crowning as described above is configured as follows (see Fig. 20 ).
  • the biasing means is provided with biasing means 109A and 109B for respectively assisting the link members 61L and 61R individually.
  • the biasing means 109A is provided with a seating plate 113 pivotally attached to be freely rotatable to the back plate 13 via a pivot 111. It is also provided with a seating plate 117 pivotally attached to the link member 61L via a pivot 115. Then, between said seating plates 113 and 117, coil springs 119 are installed. These coil springs 119 assist by operating to press the link member 61L.
  • the biasing means 109B is provided with a seating plate 123 pivotally attached to be freely rotatable to the back plate 13 via a pivot 121. It is also provided with a bracket 127 pivotally attached to the link member 61R via a pivot 125. Then, a rod 129 integrally provided to this bracket 127 is piercing through said seating plat 123 to be freely slidable, and a seating plate 131 is provided at a tip end portion of this rod 129. Then, between said seating plate 123 and the seating plate 131, coil springs 133 are installed.
  • said biasing means 109B assist by operating to pull the link member 61R.
  • the eccentric shafts are rotated via the toggle mechanism as an example of the force-increasing mechanism (servo mechanism). Therefore, it is possible to realize the downsizing of the actuator for rotating the eccentric shafts.
  • the biasing means for assisting the operation of the toggle mechanism (force-increasing link mechanism) for rotating said eccentric shafts. Therefore, by the synergy effect of the effect due to the toggle mechanism and the effect due to the biasing means, it is possible to make the actuator more downsized.
  • biasing means it is not to be limited to the coil springs as described above, and it is also possible to use gas springs and the like, for example.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Press Drives And Press Lines (AREA)

Claims (14)

  1. Presse plieuse (1) équipée d'une plaque avant (11) et d'une plaque arrière (13) à l'avant et à l'arrière d'une table inférieure (5) qui est attachée au côté inférieur de châssis latéraux gauche et droit (3L, 3R) dans la presse plieuse (1), et équipée d'une table supérieure (7) pourvue d'un moule supérieur pour mettre en œuvre un processus de pliage d'une pièce en forme de plaque en coopération avec un moule inférieur pourvu avec ladite table inférieure (5), afin de pouvoir se déplacer librement vers le haut ou vers le bas sur un côté supérieur desdits châssis latéraux gauche et droit (3L, 3R), la presse plieuse (1) comprenant des axes excentriques gauche et droit (23, 57L, 57R) pour mettre en œuvre le couronnement de ladite table inférieure (5), dans laquelle les axes excentriques (23, 57L, 57R) sont pourvus de manière à pouvoir tourner librement sur ladite table inférieure (5), et un mécanisme de démultiplication de force (41) est pourvu pour transmettre une force augmentée en sortie d'un actionneur (31, 69) vers chaque dit axe excentrique (23, 57L, 57R) entre l'actionneur (31, 69) qui fait tourner lesdits axes excentriques (23, 57L, 57R) et chaque dit axe excentrique (23, 57L, 57R),
    la presse plieuse (1) étant caractérisée en ce que
    ledit mécanisme de démultiplication de force (41) est configuré avec un mécanisme de commutation (41L, 41R, 73L, 73R, 93L, 93R).
  2. Presse plieuse (1) selon la revendication 1 dans laquelle, dans ledit mécanisme de démultiplication de force (41), chaque élément de levier (43, 59L, 59R) est pourvu de manière intégrée de chaque axe excentrique (23, 57L, 57R), qui est pourvu pour être déployé dans une direction qui intersecte les centres d'axe gauche et droit de chaque axe excentrique (23, 57L, 57R), et chaque élément de liaison (49L, 49R, 61L, 61R, 95L, 95R) est pourvu d'une portion d'extrémité connectée de manière pivotante à une portion d'extrémité de chaque dit élément de levier (43, 59L, 59R), dans laquelle un côté portion d'extrémité de base de chaque dit élément de liaison (49L, 49R, 61L, 61R, 95L, 95R) connecté de manière pivotante dans une direction qui intersecte une direction longitudinale de chaque élément de liaison (49L, 49R, 61L, 61R, 95L, 95R) est poussé ou tiré par ledit actionneur (31, 69).
  3. Presse plieuse (1) selon la revendication 1 ou 2, dans laquelle chaque axe excentrique (23, 57L, 57R) gauche et droit est équipé respectivement d'une pluralité d'axes excentriques (23, 57L, 57R) agencés parallèlement en direction gauche-droite, et les axes de la pluralité d'axes excentriques (23, 57L, 57R) sont pourvus pour être agencés en parallèle et configurés pour tourner de manière synchrone dans une même direction.
  4. Presse plieuse (1) selon la revendication 1, dans laquelle les mécanismes d'axe excentrique gauche et droit sont pourvus à intervalles en direction gauche-droite, et le mécanisme de démultiplication de force (41) est pourvu individuellement entre chaque dit actionneur (31, 69) et chaque dit mécanisme d'axe excentrique, de manière à actionner individuellement chaque dit mécanisme d'axe excentrique.
  5. Presse plieuse (1) selon la revendication 1, dans laquelle ledit axe excentrique (23, 57L, 57R) est équipé d'une pluralité d'axes excentriques (23, 57L, 57R) agencés en parallèle en direction gauche-droite, et ledit mécanisme de commutation (73L, 73R) est équipé d'une portion d'extrémité de chaque élément de liaison (49L, 49R, 61L, 61R, 95L, 95R) connectée de manière pivotante à une portion d'extrémité de chaque élément de levier (43, 59L, 59R) qui est pourvue de manière intégrée de chaque axe excentrique (23, 57L, 57R), pourvue pour être agencée en parallèle, dans laquelle une portion de côté d'extrémité de base connectée de manière pivotante de chaque élément de liaison (49L, 49R, 61L, 61R, 95L, 95R) est poussée ou tirée par ledit actionneur (31, 69).
  6. Presse plieuse (1) selon l'une quelconque des revendications 1 à 4, dans laquelle ledit actionneur (31, 69) est un servomoteur, et un élément pour pousser ou tirer la portion connectée de manière pivotante de chaque dit élément de liaison (49L, 49R, 61L, 61R, 95L, 95R) est un écrou à billes (89) vissé de façon à pouvoir aller et venir librement avec une vis à billes (87) à entraîner en rotation par ledit servomoteur.
  7. Presse plieuse (1) selon la revendication 1, dans laquelle ladite vis à billes (87) est agencée dans un plan parallèle à une surface de plateau de la table inférieure (5), et un axe de rotation du servomoteur (35) est agencé dans un plan parallèle à une surface de plateau de ladite table inférieure (5).
  8. Presse plieuse (1) selon la revendication 1, dans laquelle des axes excentriques gauche et droit (23, 57L, 57R) destinés à mettre en œuvre un couronnement de ladite table inférieure (5) sont pourvus pour être librement rotatifs sur ladite table inférieure (5), les deux côtés d'extrémité d'un élément de connexion actionnable avec une expansion libre (47, 83) sont pourvus pour être connectés aux côtés d'extrémité libres dans chaque mécanisme de liaison à démultiplication de force avec un côté d'extrémité de base connecté auxdits axes excentriques gauche et droit (23, 57L, 57R), et un actionneur (31, 69) pour mettre en œuvre une opération d'expansion ou de contraction dudit élément de connexion (83) est pourvu sur ledit élément de connexion (83).
  9. Presse plieuse (1) selon la revendication 1, dans laquelle ledit élément de connexion (47, 83) est équipé de mécanismes de vis à billes aux deux côtés d'extrémité, et équipé d'actionneurs (31) pour actionner individuellement les mécanismes de vis à billes sur les deux côtés d'extrémité.
  10. Presse plieuse (1) selon la revendication 8 ou 9, dans laquelle ledit mécanisme de liaison à démultiplication de force est équipé d'une portion d'extrémité de chaque élément de liaison (49L, 49R, 61L, 61R, 95L, 95R) connectée de manière pivotante à une portion d'extrémité d'un élément de levier respectif (43, 59L, 59R) avec une portion d'extrémité de base connectée à chaque axe excentrique (23, 57L, 57R) pourvu de manière adjacente, un élément de liaison (95L, 95R) dans chaque dit élément de liaison (49L, 49R, 61L, 61R, 95L, 95R) est pourvu pour être plus long qu'un autre élément de liaison (95L, 95R), un côté portion d'extrémité de base d'un autre élément de liaison (49L, 49R, 61L, 61R, 95L, 95R) est pourvu pour être connecté de manière pivotante à une position médiane dans ledit élément de liaison (49L, 49R, 95L, 95R), et une portion d'extrémité dudit élément de connexion (47, 83) est connectée à un côté portion d'extrémité de base dans ledit élément de liaison (49L, 49R, 61L, 61R, 95L, 95R).
  11. Presse plieuse (1) selon la revendication 1, dans laquelle des axes excentriques gauche et droit (23, 57L, 57R) destinés à mettre en œuvre le couronnement de ladite table inférieure (5) sont pourvus pour être librement rotatifs sur ladite table inférieure (5), le mécanisme de démultiplication de force (41) pour transmettre comme sortie d'un actionneur (31, 69) à chaque dit axe excentrique (23, 57L, 57R) une force démultipliée est pourvu entre l'actionneur (31, 69) pour faire tourner chaque dit axe excentrique (23, 57L, 57R) et ledit axe excentrique (23, 57L, 57R), et un moyen de contrainte pour assister un actionnement dudit actionneur (31, 69) quand ledit axe excentrique (23, 57L, 57R) est mis en rotation par ledit actionneur (31, 69) est pourvu.
  12. Presse plieuse (1) selon la revendication 1, dans laquelle les deux côtés d'extrémité d'un élément de connexion à expansion libre (47, 83) sont pourvus pour être connectés aux côtés d'extrémité libres dans chaque mécanisme de liaison à démultiplication de force avec un côté d'extrémité de base connecté auxdits axes excentriques gauche et droit (23, 57L, 57R), l'élément de connexion (47, 83) est équipé de mécanismes de vis à billes aux deux côtés d'extrémité de cet élément de connexion (47, 83), des actionneurs (31) pour actionner individuellement les mécanismes de vis à billes aux deux côtés d'extrémité sont pourvus, et un moyen de contrainte pour assister le fonctionnement de chaque actionneur (31, 69) quand chaque dit mécanisme de liaison à démultiplication de force est actionné par chaque dit actionneur (31, 69) est pourvu.
  13. Presse plieuse (1) selon la revendication 1, dans laquelle des axes excentriques gauche et droit (23, 57L, 57R) destinés à mettre en œuvre un couronnement de ladite table inférieure (5) sont pourvus pour être librement rotatifs sur ladite table inférieure (5), les deux côtés d'extrémité d'un élément de connexion à expansion libre (47, 83) sont pourvus pour être connectés aux côtés d'extrémité libres dans chaque mécanisme de liaison à démultiplication de force avec un côté d'extrémité de base connecté auxdits axes excentriques gauche et droit (23, 57L, 57R), des actionneurs (31) pour faire tourner des mécanismes de vis à billes pourvus sur cet élément de connexion (47, 83) sont pourvus sur chaque élément de connexion (47, 83), et un moyen de contrainte pour assister les actionnements desdits actionneurs (31) quand chaque dit mécanisme de liaison à démultiplication de force est actionné par lesdits actionneurs (31) via ledit élément de connexion (47, 83) est pourvu sur chaque mécanisme de liaison à démultiplication de force.
  14. Presse plieuse (1) selon l'une quelconque des revendications 11, 12 et 13, dans laquelle ledit moyen de contrainte est un ressort de compression.
EP17763132.2A 2016-03-11 2017-03-03 Presse-plieuse utilisant un mécanisme d'augmentation de force Active EP3427854B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2016047798 2016-03-11
JP2017000111A JP6175200B1 (ja) 2016-03-11 2017-01-04 プレスブレーキのクラウニング方法及びプレスブレーキ
PCT/JP2017/008581 WO2017154792A1 (fr) 2016-03-11 2017-03-03 Procédé de bombement à la presse-plieuse utilisant un mécanisme d'augmentation de force, et presse-plieuse

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EP3427854A4 EP3427854A4 (fr) 2019-03-27
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CN108608480B (zh) * 2018-04-13 2024-02-23 浙江奥星工贸有限公司 一种裁断机的横梁升降机构及升降方法
CN109848263B (zh) * 2019-01-29 2024-04-05 廊坊中德汽车座椅制造有限公司 汽车座椅u型头枕骨架折弯机

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JPH08129938A (ja) * 1994-09-08 1996-05-21 Chubu Electric Power Co Inc 電力用開閉機器の電動式開閉操作装置
JP2927192B2 (ja) * 1994-10-03 1999-07-28 村田機械株式会社 パンチ駆動装置
JP6457805B2 (ja) * 2014-02-27 2019-01-23 株式会社アマダホールディングス 曲げ加工装置

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JP6175200B1 (ja) 2017-08-02
EP3427854A1 (fr) 2019-01-16
EP3427854A4 (fr) 2019-03-27
WO2017154792A1 (fr) 2017-09-14
JP2017164809A (ja) 2017-09-21

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