US20200171561A1 - Press system - Google Patents

Press system Download PDF

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Publication number
US20200171561A1
US20200171561A1 US16/615,540 US201816615540A US2020171561A1 US 20200171561 A1 US20200171561 A1 US 20200171561A1 US 201816615540 A US201816615540 A US 201816615540A US 2020171561 A1 US2020171561 A1 US 2020171561A1
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United States
Prior art keywords
slide
height
feed
workpiece
press
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.)
Abandoned
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US16/615,540
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English (en)
Inventor
Hitoshi Sakurai
Koyo YAMAZAKI
Atsuo Oketani
Toshihiro Minami
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Komatsu Industries Corp
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Komatsu Industries Corp
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Publication of US20200171561A1 publication Critical patent/US20200171561A1/en
Abandoned legal-status Critical Current

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    • 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
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/02—Advancing work in relation to the stroke of the die or tool
    • B21D43/021—Control or correction devices in association with moving strips
    • 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
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/02—Advancing work in relation to the stroke of the die or tool
    • B21D43/04—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
    • B21D43/08—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by rollers
    • B21D43/09—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by rollers by one or more pairs of rollers for feeding sheet or strip material
    • 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
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/14—Control arrangements for mechanically-driven presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/30—Feeding material to presses

Definitions

  • the present invention relates to a press system.
  • Japanese Patent Laying-Open No. 2013-184222 discloses a method of setting a rotary motion at the time when a crankshaft is rotated by a servo motor in a conventional press.
  • PTL 1 Japanese Patent Laying-Open No. 2013-184222
  • An object of the present invention is to provide a press system capable of achieving an improved production rate.
  • a press system includes a press portion, a transportation portion, and a controller.
  • the press portion includes an electric motor, an eccentric mechanism, a slide, and a bolster.
  • the eccentric mechanism converts a rotary motion by the electric motor into an upward and downward motion.
  • An upper die can be attached to the slide and the slide is driven upward and downward with the eccentric mechanism being interposed.
  • a lower die can be attached to the bolster.
  • the press portion is configured to press work a workpiece by upward and downward movement of the slide with respect to the bolster.
  • the transportation portion is configured to transport the workpiece.
  • the controller is configured to control the press portion and the transportation portion.
  • the controller is configured to have the slide driven upward and downward based on a prescribed press motion.
  • a position of the slide where the workpiece can be transported without interfering with the upper die is defined as a feed-allowable height, and a position higher than the feed-allowable height and highest in the press motion is defined as a stand-by height.
  • the controller is also configured to have the workpiece transported while the slide is moving between the feed-allowable height and the stand-by height.
  • a production rate can be improved.
  • FIG. 1 is a diagram illustrating a construction of a press system based on an embodiment.
  • FIG. 2 is a perspective view of a press apparatus based on the embodiment.
  • FIG. 3 is a lateral cross-sectional view showing a main portion of the press apparatus.
  • FIG. 4 is a plan view of a partial cross-section showing another main portion of the press apparatus.
  • FIG. 5 is a diagram illustrating overview of a drive system of the press system based on the embodiment.
  • FIG. 6 is a functional block diagram of a CPU based on the embodiment.
  • FIG. 7 is a schematic diagram showing arrangement of a die and a workpiece when a slide is located at a feed-allowable height.
  • FIG. 8 is a schematic diagram showing arrangement of the die and the workpiece when the slide is located at a touch position.
  • FIG. 9 is a schematic diagram showing arrangement of the die and the workpiece when the slide is located at a work end position.
  • FIG. 10 is a first diagram illustrating an angle of rotation of a main shaft corresponding to each position representing a slide position parameter.
  • FIG. 11 is a second diagram illustrating an angle of rotation of the main shaft corresponding to each position representing a slide position parameter.
  • FIG. 12 is a flowchart illustrating generation of a motion in the press system based on the embodiment.
  • FIG. 13 is a diagram showing a press motion and a feeder motion generated by the press system based on the embodiment.
  • FIG. 14 is a diagram showing an approach to setting of a monitoring position.
  • the present example relates to a press apparatus and describes a forward feed press apparatus by way of example.
  • FIG. 1 is a diagram illustrating a construction of a press system based on an embodiment.
  • the press system includes an uncoiler 100 , a leveler feeder (a transportation portion) 200 , a press apparatus (a press portion) 10 , and a conveyor 120 .
  • a coil material (a strip plate) is wound around uncoiler 100 .
  • press working of the coil material as a workpiece (material) will be described.
  • the coil material unwound from uncoiler 100 is transported to press apparatus 10 by leveler feeder 200 .
  • Leveler feeder 200 adjusts a position of a feed height of the coil material transported from uncoiler 100 to press apparatus 10 and transports the coil material to press apparatus 10 under an operation condition (a feeder motion) in a set direction of transportation.
  • Press apparatus 10 press works the coil material transported from leveler feeder 200 .
  • Conveyor 120 transports the workpiece formed by press working by press apparatus 10 . Conveyor 120 can also transport the formed workpiece, for example, to a next press apparatus.
  • Components in the press system are in synchronization with one another, and a series of operations is sequentially and successively performed.
  • the coil material is transported from uncoiler 100 via leveler feeder 200 to press apparatus 10 .
  • press apparatus 10 performs press working, and the worked workpiece is transported by conveyor 120 .
  • a series of processes above is repeated.
  • Leveler feeder 200 is operated in accordance with an instruction from press apparatus 10 .
  • a controller configured to control leveler feeder 200 is provided in press apparatus 10 .
  • controller configured to control leveler feeder 200 is provided in press apparatus 10
  • limitation thereto is not intended, and for example, a controller configured to control press apparatus 10 may be provided on a side of leveler feeder 200 .
  • a controller configured to control press apparatus 10 and leveler feeder 200 may be arranged at a position different from press apparatus 10 and leveler feeder 200 to remotely control press apparatus 10 and leveler feeder 200 .
  • the embodiment describes an example in which a single controller controls both of leveler feeder 200 and press apparatus 10 .
  • FIG. 2 is a perspective view of press apparatus 10 based on the embodiment.
  • FIG. 2 shows a forward feed press apparatus without a plunger by way of example.
  • Press apparatus 10 includes a main body frame 2 , a slide 20 , a bed 4 , a bolster 5 , a control panel 6 , and a controller 40 .
  • Slide 20 is supported in a substantially central portion of main body frame 2 of press apparatus 10 as being vertically movable.
  • Bolster 5 attached onto bed 4 is arranged under slide 20 .
  • Controller 40 is provided laterally to main body frame 2 .
  • Control panel 6 connected to controller 40 is provided laterally to main body frame 2 and in front of controller 40 .
  • An upper die of dice for working a workpiece is removably attached to a lower surface of slide 20 .
  • a lower die of the dice for working a workpiece is removably attached to an upper surface of bolster 5 .
  • a prescribed workpiece corresponding to the dice is placed on the lower die, the upper die is lowered together with slide 20 , and the workpiece is press worked as being sandwiched between the upper die and the lower die.
  • a remote controller (remote control unit) 70 provided to communicate with a main body of press apparatus 10 and to allow external remote control is provided.
  • An operator a person responsible for operation
  • Remote controller 70 can communicate with controller 40 to operate press apparatus 10 in accordance with an instruction therefrom.
  • remote controller 70 is provided with an up button 72 and a down button 74 for vertically operating slide 20 and an enter button 76 .
  • Control panel 6 is provided to input various types of data necessary for controlling press apparatus 10 , and includes a switch and a numeric keypad for inputting data and a display configured to show a setting screen and data output from press apparatus 10 .
  • Such a programmable display that a transparent touch switch panel is attached to a front surface of a graphic display such as a liquid crystal display or a plasma display is adopted as a display.
  • Control panel 6 may include a data input device which receives input of data from an external storage medium such as an integrated circuit (IC) card where data set in advance is stored or a communication device which transmits and receives data wirelessly or through a communication line.
  • IC integrated circuit
  • press apparatus 10 Although the present example describes a construction in which both of control panel 6 and remote controller 70 are provided for press apparatus 10 , the construction of press apparatus 10 is by way of example and limitation thereto is not intended. For example, only one of control panel 6 and remote controller 70 may be provided for press apparatus 10 .
  • FIG. 3 is a lateral cross-sectional view showing a main portion of press apparatus 10 .
  • press apparatus 10 is implemented by a servo press.
  • Press apparatus 10 includes a servo motor 121 , a spherical hole 33 A, a screw shaft 37 , a spherical portion 37 A, a thread portion 37 B, and a connecting rod main body 38 .
  • Press apparatus 10 further includes a female thread portion 38 A, a connecting rod 39 , a main shaft 110 , an eccentric portion 110 A, a side frame 111 , bearing portions 112 to 114 , a main gear 115 , a power transmission shaft 116 , a transmission gear 116 A, bearing portions 117 and 118 , and a pulley 119 .
  • servo motor 121 drives slide 20 .
  • Servo motor 121 represents one example of an electric motor.
  • spherical hole 33 A provided in an upper portion of slide 20
  • spherical portion 37 A provided at a lower end of screw shaft 37 for adjusting a die height is rotatably inserted so as not to come off.
  • Spherical hole 33 A and spherical portion 37 A make up a spherical joint.
  • Thread portion 37 B of screw shaft 37 is exposed upward through slide 20 , and screwed to female thread portion 38 A of connecting rod main body 38 provided above screw shaft 37 .
  • Screw shaft 37 and connecting rod main body 38 make up extendable connecting rod 39 .
  • the die height refers to a distance from a lower surface of slide 20 at the time when slide 20 is arranged at a bottom dead center to an upper surface of bolster 5 .
  • connecting rod 39 is rotatably coupled to eccentric portion 110 A like a crank provided in main shaft 110 .
  • Main shaft 110 is movably supported by bearing portions 112 , 113 , and 114 located at three front and rear locations between a pair of left and right thick side frames 111 which form main body frame 2 .
  • Main gear 115 is attached to a rear portion of main shaft 110 .
  • Main gear 115 is meshed with transmission gear 116 A of power transmission shaft 116 provided below.
  • Power transmission shaft 116 is movably supported by bearing portions 117 and 118 located at two front and rear locations between side frames 111 .
  • Power transmission shaft 116 has a rear end attached to driven pulley 119 .
  • Pulley 119 is driven by servo motor 121 arranged below.
  • Press apparatus 10 further includes a bracket 122 , an output shaft 121 A, a pulley 123 , a belt 124 , a bracket 125 , a position detector 126 , a rod 127 , a position sensor 128 , an auxiliary frame 129 , and bolts 131 and 132 .
  • Servo motor 121 is supported between side frames 111 with bracket 122 substantially in an L shape being interposed.
  • Servo motor 121 has output shaft 121 A projecting along a front-rear direction of press apparatus 10 , and motive power is transmitted by belt 124 wound around driving pulley 123 provided on output shaft 121 A and driven pulley 119 .
  • a pair of brackets 125 projecting rearward between side frames 111 from two upper and lower locations is attached on a rear surface side of slide 20 .
  • Rod 127 which implements position detector 126 such as a linear scale is attached between upper and lower brackets 125 .
  • Rod 127 is provided with a scale for detecting a vertical position of slide 20 and vertically movably fitted into position sensor 128 similarly implementing position detector 126 .
  • Position sensor 128 is fixed to auxiliary frame 129 provided in one side frame 111 .
  • Auxiliary frame 129 is formed in a vertically elongated manner.
  • the auxiliary frame has a lower portion attached to side frame 111 by bolt 131 and an upper portion vertically slidably supported by bolt 132 inserted in a vertically elongated hole.
  • Auxiliary frame 129 has thus only any one side (a lower side in the present embodiment) of upper and lower sides fixed to side frame 111 and has the other side vertically movably supported. Therefore, the auxiliary frame is not affected by contraction and extension caused by variation in temperature of side frame 111 .
  • Position sensor 128 can thus accurately detect a slide position and a die height position without being affected by such contraction and extension of side frame 111 .
  • FIG. 4 is a plan view of a partial cross-section showing another main portion of press apparatus 10 .
  • slide position adjustment mechanism 133 is constituted of a worm wheel 134 attached to an outer circumference of spherical portion 37 A with a pin 37 C being interposed, a worm gear 135 meshed with worm wheel 134 , an input gear 136 attached to an end of worm gear 135 , and an induction motor 138 including an output gear 137 ( FIG. 3 ) meshed with input gear 136 .
  • Induction motor 138 is in a flat shape shorter in axial length and constructed to be compact. Screw shaft 37 can be turned by a rotary motion of induction motor 138 with worm wheel 134 being interposed. A length of screwing between thread portion 37 B of screw shaft 37 and female thread portion 38 A of connecting rod main body 38 is thus varied to adjust the slide position of slide 20 and the die height.
  • FIG. 5 is a diagram illustrating overview of a drive system of the press system based on the embodiment.
  • leveler feeder 200 includes a transportation roller 63 , a servo motor 62 , an encoder 64 , a feed completion detector 68 , and a servo amplifier 60 .
  • Press apparatus 10 includes controller 40 , a servo amplifier 66 , servo motor 121 , an encoder 65 , main gear 115 , main shaft 110 , eccentric portion 110 A, slide 20 , an upper die 22 A, a lower die 22 B, and bolster 5 .
  • Controller 40 includes a central processing unit (CPU) 42 , a memory 44 , a communication circuit 46 , and an input unit 48 .
  • CPU central processing unit
  • Communication circuit 46 is provided to be able to communicate with remote controller 70 .
  • CPU 42 outputs a target value to servo amplifier 60 .
  • Servo amplifier 60 gives a speed instruction to servo motor 62 based on the target value.
  • Transportation roller 63 performs an operation to transport a workpiece W as servo motor 62 is driven.
  • Feed completion detector 68 determines whether or not an operation to transport workpiece W has been completed. When the feed completion detector detects completion of the transportation operation and stop of workpiece W, the feed completion detector outputs a result of detection to CPU 42 as a feed completion signal.
  • Encoder 64 outputs a feedback signal based on the number of rotations of servo motor 62 in accordance with the speed instruction to servo amplifier 60 .
  • Servo amplifier 60 adjusts the number of rotations of servo motor 62 to a value in accordance with the target value by controlling supply of electric power to servo motor 62 based on the feedback signal from encoder 64 .
  • CPU 42 controls a speed of transportation in the operation to transport workpiece W.
  • Servo amplifier 66 gives a speed instruction to servo motor 121 based on the target value.
  • Main gear 115 drives main shaft 110 as servo motor 121 is driven.
  • eccentric portion 110 A is rotated.
  • Eccentric portion 110 A is coupled to slide 20 , and slide 20 to which upper die 22 A is attached moves upward and downward in accordance with a rotation of eccentric portion 110 A.
  • Eccentric portion 110 A implements an eccentric mechanism which converts a rotary motion by servo motor 121 into an upward and downward motion of slide 20 .
  • slide 20 is driven upward and downward and lowered to a position of the bottom dead center under an operation condition (press motion) in the set upward and downward direction, press working of workpiece W transported to a position between upper die 22 A and lower die 22 B is performed.
  • Upper die 22 A is a movable die which is attached to slide 20 and is reciprocatively vertically moved integrally with slide 20 with upward and downward movement of slide 20 .
  • Lower die 22 B is a fixed die attached to bolster 5 and placed and fixed onto bolster 5 . As slide 20 moves upward and downward with respect to bolster 5 , workpiece W is sandwiched between upper die 22 A and lower die 22 B and press worked.
  • Encoder 65 outputs a feedback signal based on the number of rotations of servo motor 121 in accordance with a speed instruction to servo amplifier 66 .
  • Servo amplifier 66 adjusts the number of rotations of servo motor 121 to a value in accordance with the target value by controlling supply of electric power to servo motor 121 based on the feedback signal from encoder 65 .
  • CPU 42 controls a speed of slide 20 in the upward and downward movement.
  • CPU 42 based on the embodiment performs processing for synchronizing a transportation operation by leveler feeder 200 (which is also simply referred to as a feeder) with the upward and downward movement of slide 20 of press apparatus 10 based on control data stored in memory 44 .
  • leveler feeder 200 which is also simply referred to as a feeder
  • memory 44 stores control data in which upward and downward movement of slide 20 is associated with a workpiece transportation operation by leveler feeder 200 .
  • Input unit 48 accepts input of various parameters.
  • input unit 48 accepts input of a parameter through control panel 6 or remote controller 70 .
  • An operator inputs various parameters by operating a switch and a numeric keypad in control panel 6 or each button on remote controller 70 .
  • Control panel 6 and remote controller 70 implement the operation portion in the embodiment.
  • a parameter received by input unit 48 includes a slide position parameter relating to a position of slide 20 in the upward and downward direction with respect to bolster 5 .
  • a parameter received by input unit 48 includes a transportation parameter relating to an operation by leveler feeder 200 .
  • FIG. 6 is a functional block diagram of CPU 42 based on the embodiment.
  • CPU 42 includes a touch speed generator 51 , a press motion generator 53 , a feeder motion generator 55 , a motion synthesizer 56 , and an execution unit 58 .
  • Each one in the functional block diagram is implemented in coordination with each component (such as communication circuit 46 ) by execution by CPU 42 of a prescribed application program stored in memory 44 .
  • Touch speed generator 51 sets a speed (touch speed) of slide 20 at the time when slide 20 is lowered and upper die 22 A comes in contact with workpiece W based on a material property and a thickness of workpiece W input to input unit 48 .
  • Press motion generator 53 automatically generates a press motion based on a slide position parameter input to input unit 48 .
  • the slide position parameter includes a feed-allowable height, a touch position, and a work end position.
  • Feeder motion generator 55 automatically generates a feeder motion based on a transportation parameter input to input unit 48 .
  • the transportation parameter includes a feed length.
  • Motion synthesizer 56 automatically generates a synthesized motion by automatically synthesizing the press motion generated by press motion generator 53 and a feeder motion generated by feeder motion generator 55 .
  • the feed-allowable height refers to a lower limit of a position of slide 20 where upper die 22 A does not interfere with transported workpiece W.
  • FIG. 7 is a schematic diagram showing arrangement of the die and workpiece W when slide 20 is located at the feed-allowable height. When slide 20 is distant from bolster 5 by a distance greater than the feed-allowable height, workpiece W can be transported without interfering with upper die 22 A.
  • the touch position refers to a position of slide 20 at the time when upper die 22 A comes in contact with workpiece W.
  • FIG. 8 is a schematic diagram showing arrangement of the die and workpiece W when slide 20 is located at the touch position.
  • the work end position refers to a position of slide 20 at the time point of end of press working of workpiece W.
  • FIG. 9 is a schematic diagram showing arrangement of the die and workpiece W when slide 20 is located at the work end position.
  • the feed length refers to a length of transportation of workpiece W by leveler feeder 200 in the direction of transportation of workpiece W after end of press working of workpiece W and before start of next press working.
  • a speed of transportation of workpiece W transported by leveler feeder 200 is referred to as a feed rate.
  • the feed rate is saved in memory 44 .
  • the feed rate may be included in a transportation parameter input to input unit 48 .
  • press motion generator 53 When press motion generator 53 generates a press motion, an operation mode for maximizing an amount of production per unit time is set. Furthermore, a production rate (unit: shot per minute (SPM)) is set.
  • SPM shot per minute
  • the operation mode includes a rotary motion, a reverse motion, and a pendular motion.
  • the rotary motion refers to an operation mode in which eccentric portion 110 A ( FIG. 3 ) is rotated in one direction to drive slide 20 in one cycle.
  • the reverse motion refers to an operation mode in which slide 20 is reversely driven between a down stroke and an up stroke between two angles of rotation corresponding to prescribed lower limit position and upper limit position set between angles of rotation of eccentric portion 110 A corresponding to the top dead center and the bottom dead center of slide 20 .
  • the pendular motion refers to an operation mode in which slide 20 is reciprocatively driven across the bottom dead center by setting as two upper limit positions, two angles of rotation distant by a prescribed angle in a direction of forward rotation and a direction of reverse rotation from a bottom dead center angle of rotation of eccentric portion 110 A corresponding to the bottom dead center of slide 20 and rotationally driving the slide in one direction from one upper limit position across the bottom dead center angle of rotation to the other upper limit position.
  • Execution unit 58 controls a transportation operation by leveler feeder 200 and press working by press apparatus 10 based on a synthesized motion generated by motion synthesizer 56 . Specifically, execution unit 58 outputs a target value for driving servo motors 62 and 121 to servo amplifiers 60 and 66 based on the synthesized motion, and performs synchronization processing for synchronizing the press motion and the feeder motion with each other.
  • FIG. 10 is a first diagram illustrating an angle of rotation of main shaft 110 corresponding to each position representing a slide position parameter.
  • FIG. 10 shows angles of rotation of main shaft 110 corresponding to a top dead center TDC, a bottom dead center BDC, a stand-by height P 0 , a monitoring position Pa, a feed-allowable height P 1 , a touch position P 2 , a work end position P 3 , a jump prevention height P 4 , a feed-allowable height P 5 , and a stand-by height P 6 of slide 20 .
  • FIG. 10 shows each position representing a slide position parameter when main shaft 110 is rotated clockwise in the figure.
  • the operation mode of slide 20 is set to the pendular motion in which the slide is reciprocatively driven across bottom dead center BDC with stand-by heights P 0 and P 6 being defined as upper limit positions.
  • Slide 20 starts lowering from stand-by height P 0 , sequentially passes monitoring position Pa, feed-allowable height P 1 , touch position P 2 , and work end position P 3 , reaches bottom dead center BDC, moves upward from bottom dead center BDC, sequentially passes jump prevention height P 4 and feed-allowable height P 5 , moves to stand-by height P 6 , and stops. Since stand-by heights P 0 and P 6 are located at positions lower than top dead center TDC, slide 20 never passes top dead center TDC.
  • stand-by height P 0 is located at a position higher than feed-allowable height P 1 .
  • Stand-by height P 6 is located at a position higher than feed-allowable height P 5 .
  • Stand-by heights P 0 and P 6 are located at a highest position in a press motion.
  • Monitoring position Pa is set at a position higher than feed-allowable height P 1 and lower than stand-by height P 0 in the upward and downward direction of slide 20 .
  • Work end position P 3 is set as a position higher than bottom dead center BDC. Lowered slide 20 passes work end position P 3 before reaching bottom dead center BDC.
  • Jump prevention height P 4 is set as a position higher than bottom dead center BDC. Slide 20 starts moving upward after it passes bottom dead center BDC, and passes jump prevention height P 4 . In order to prevent wobble of workpiece W between upper die 22 A and lower die 22 B at the time when upper die 22 A is raised after end of press working of workpiece W, a speed of slide 20 while it is moved from work end position P 3 to jump prevention height P 4 is set to be low.
  • a different position of jump prevention height P 4 can be set for each condition of a material property, a thickness, and a method of working of workpiece W.
  • Set jump prevention height P 4 is saved in memory 44 ( FIG. 5 ).
  • jump prevention height P 4 is set by making trials a plurality of times before starting working.
  • FIG. 11 is a second diagram illustrating an angle of rotation of main shaft 110 corresponding to each position representing a slide position parameter.
  • FIG. 11 shows angles of rotation of main shaft 110 corresponding to top dead center TDC, bottom dead center BDC, stand-by height P 0 , monitoring position Pa, feed-allowable height P 1 , touch position P 2 , work end position P 3 , jump prevention height P 4 , feed-allowable height P 5 , and stand-by height P 6 of slide 20 as in FIG. 10 .
  • FIG. 11 shows each position representing a slide position parameter when main shaft 110 is rotated counterclockwise in the figure.
  • Stand-by height P 0 shown in FIG. 11 is a position the same as stand-by height P 6 which represents a stop position of slide 20 shown in FIG. 10 .
  • Monitoring position Pa, feed-allowable height P 1 , touch position P 2 , work end position P 3 , jump prevention height P 4 , and feed-allowable height P 5 shown in FIGS. 10 and 11 are set in line symmetry with respect to a straight line which passes through top dead center TDC and bottom dead center BDC in FIGS. 10 and 11 .
  • Stand-by height P 6 shown in FIG. 11 is a position the same as stand-by height P 0 which represents a movement start position of slide 20 shown in FIG. 10 .
  • Slide 20 starts lowering from stand-by height P 0 , sequentially passes monitoring position Pa, feed-allowable height P 1 , touch position P 2 , and work end position P 3 , reaches bottom dead center BDC, starts moving upward from bottom dead center BDC, sequentially passes jump prevention height P 4 and feed-allowable height P 5 , moves to stand-by height P 6 , and stops.
  • FIG. 12 is a flowchart illustrating generation of a motion in the press system based on the embodiment.
  • step S 1 various parameters are input to input unit 48 . Specifically, an operator inputs parameters necessary for generating a motion by operating control panel 6 or remote controller 70 ( FIG. 2 ).
  • step S 2 a touch speed is set.
  • touch speed generator 51 sets a touch speed by referring to a touch speed table for each material property of workpiece W stored in memory 44 ( FIG. 5 ) of controller 40 , based on input material property and thickness of workpiece W.
  • step S 3 a feeder motion is generated.
  • feeder motion generator 55 generates a feeder motion based on input feed length and feed rate.
  • FIG. 13 is a diagram showing a press motion and a feeder motion generated by the press system based on the embodiment.
  • the abscissa in the graph in FIG. 13 (A) represents time and the ordinate represents an angular speed ⁇ of main shaft 110 based on rotational drive by servo motor 121 .
  • An angular speed (max represents a value set as a maximum value of the angular speed of main shaft 110 .
  • An angular speed ⁇ 1 represents an angular speed of main shaft 110 corresponding to a touch speed set in step S 2 .
  • a lowering speed of slide 20 is set to a touch speed.
  • a prescribed value of an acceleration at the time of increase or decrease in transportation speed is saved in memory 44 .
  • the feeder motion is generated as set forth above.
  • step S 4 a press motion is generated.
  • press motion generator 53 generates a press motion based on the input feed-allowable height (P 1 ), touch position (P 2 ), and work end position (P 3 ) and the touch speed set in step S 2 .
  • stand-by height P 0 refers to a position where slide 20 remains stopped, and hence angular speed ⁇ of main shaft 110 at stand-by height P 0 is zero.
  • Stand-by height P 0 is set as a position from which the main shaft can be accelerated to maximum angular speed ⁇ max at an angle of rotation corresponding to feed-allowable height P 1 by being accelerated at a prescribed acceleration.
  • Slide 20 starts lowering from stand-by height P 0 toward bottom dead center BDC, and is accelerated at a prescribed acceleration until main shaft 110 reaches maximum angular speed ⁇ max.
  • Main shaft 110 reaches its maximum angular speed ⁇ max when slide 20 passes feed-allowable height P 1 .
  • Slide 20 passes feed-allowable height P 1 at the maximum speed.
  • Main shaft 110 completes acceleration before slide 20 passes feed-allowable height P 1 as slide 20 is lowered.
  • Main shaft 110 is decelerated from maximum angular speed ⁇ max and rotated at angular speed ⁇ 1 at the time point when slide 20 reaches touch position P 2 . Thereafter, main shaft 110 is rotated at equal angular speed ⁇ 1 until slide 20 reaches work end position P 3 . Slide 20 is thus lowered at the touch speed from touch position P 2 to work end position P 3 .
  • main shaft 110 (and slide 20 ) starts acceleration. While slide 20 is moving between work end position P 3 and jump prevention height P 4 , in order to prevent wobble of workpiece W, slide 20 is moved at a speed slightly higher than the touch speed and main shaft 110 is rotated at a speed slightly higher than angular speed ⁇ 1 .
  • main shaft 110 is again accelerated at a prescribed acceleration until maximum angular speed ⁇ max is reached. After maximum speed ⁇ max is reached, rotation of main shaft 110 at maximum angular speed ⁇ max is continued until slide 20 reaches feed-allowable height P 5 . Slide 20 passes feed-allowable height P 5 at the maximum speed.
  • main shaft 110 is decelerated at a prescribed acceleration from maximum angular speed ⁇ max.
  • Main shaft 110 starts deceleration after it passes feed-allowable height P 5 as slide 20 is moved upward.
  • Main shaft 110 stops rotation at the time point when slide 20 reaches stand-by height P 6 .
  • Slide 20 stops at a position at stand-by height P 6 .
  • Stand-by height P 6 is set as a position where the main shaft is decelerated to a zero angular speed by deceleration at a prescribed acceleration from an angle of rotation corresponding to feed-allowable height P 5 .
  • the press motion is generated as set forth above.
  • step S 5 a synthesized motion is generated.
  • motion synthesizer 56 generates a synthesized motion by synthesizing the feeder motion generated in step S 3 and the press motion generated in step S 4 .
  • Slide 20 which has stopped at stand-by height P 6 starts lowering after lapse of a prescribed time period.
  • Main shaft 110 which has stopped rotation when slide 20 reached stand-by height P 6 starts rotation in a reverse direction after lapse of the prescribed time period.
  • a time period elapsed since start of transportation of workpiece Was usual until completion of feed in transportation of workpiece W by a feed length at a prescribed acceleration and at a set feed rate is referred to as a feeder movement time period.
  • Main shaft 110 starts rotation such that slide 20 reaches monitoring position Pa after lapse of a press waiting time (margin) ts since a time point of lapse of the feeder movement time period.
  • Leveler feeder 200 stops its operation while slide 20 is accelerated. Feed of workpiece W has been completed press waiting time (margin) ts before the time point when slide 20 lowered from stand-by height P 0 reaches monitoring position Pa higher than feed-allowable height P 1 . Feed of workpiece W has been completed by the time point when slide 20 reaches feed-allowable height P 1 .
  • FIG. 14 is a diagram showing an approach to setting of monitoring position Pa.
  • the abscissa in the graph in FIGS. 14 (A) and (B) represents time.
  • the ordinate in the graph in FIG. 14 (A) represents a position P of slide 20 .
  • the ordinate in the graph in FIG. 14 (B) represents angular speed co of main shaft 110 based on rotational drive by servo motor 121 .
  • a solid line in FIG. 14 (A) represents a position of slide 20 when the slide is lowered as being accelerated at a prescribed acceleration until time Ta and forced stop of slide 20 is started at time Ta
  • a solid line in FIG. 14 (B) represents an angular speed of main shaft 110 when the main shaft is rotated as being accelerated at a prescribed angular acceleration until time Ta and forced stop of rotation of main shaft 110 is started at time Ta
  • a dashed line in FIG. 14 (A) represents a position of slide 20 after time Ta when slide 20 is lowered in a normal operation
  • a dashed line in FIG. 14 (B) represents an angular speed of main shaft 110 after time Ta when main shaft 110 is rotated in a normal operation.
  • stand-by height P 0 refers to a position where slide 20 remains stopped, and hence angular speed co of main shaft 110 at stand-by height P 0 is zero.
  • Main shaft 110 is accelerated at a prescribed acceleration so as to reach maximum angular speed co at the time when slide 20 passes feed-allowable height P 1 .
  • slide 20 reaches monitoring position Pa.
  • controller 40 determines whether or not completion of feed of workpiece W has been detected. Controller 40 determines whether or not it has received input of a feed completion signal indicating completion of transportation of workpiece W from feed completion detector 68 ( FIG. 5 ) at time Ta a prescribed time period after start of lowering of slide 20 from stand-by height P 0 .
  • controller 40 forces slide 20 to stop.
  • main shaft 110 is decelerated at a prescribed acceleration after time Ta.
  • a stop position Pb where slide 20 stops is higher than feed-allowable height P 1 as shown in FIG. 14 (A).
  • Monitoring position Pa is thus set such that slide 20 which has started lowering from stand-by height P 0 and reached monitoring position Pa can start deceleration at monitoring position Pa and stop at stop position Pb higher than feed-allowable height P 1 when completion of feed of workpiece W has not been detected.
  • step S 6 workpiece W is worked in accordance with the generated synthesized motion.
  • Execution unit 58 has press working of workpiece W performed based on the generated synthesized motion.
  • step S 7 whether or not a result of working of workpiece W based on the synthesized motion generated in step S 5 is appropriate is determined.
  • torque required for rotation of main shaft 110 is calculated based on a current value of servo motor 121 , and when the torque exceeds an allowable value, the result of working is determined as inappropriate.
  • vibration generated during working is determined, and when vibration exceeds an allowable value, the result of working is determined as inappropriate.
  • the allowable value of torque or vibration has been saved in memory 44 .
  • step S 8 the synthesized motion is modified in step S 8 .
  • a speed other than the speed during press working that is, the touch speed of slide 20 (angular speed ⁇ 1 of main shaft 110 )
  • the touch speed of slide 20 angular speed ⁇ 1 of main shaft 110
  • step S 6 After the synthesized motion is modified, the process returns to step S 6 , where workpiece W is worked in accordance with the modified synthesized motion. In succession, in step S 7 , whether or not the result of working of workpiece W based on the modified synthesized motion is appropriate is determined.
  • step S 7 When the result of working is determined as appropriate (YES in step S 7 ), the process proceeds to step S 9 , where the synthesized motion is saved in memory 44 .
  • step S 10 the result is output. Values input as a slide position parameter and a transportation parameter and a set and calculated value determined with automatic generation of a motion are shown on the display of control panel 6 , so that an operator can readily know a state of operation by the press system by viewing that screen on the display.
  • stand-by height P 0 located at a position higher than feed-allowable height P 1 is set and stand-by height P 6 located at a position higher than feed-allowable height P 5 is set.
  • transportation of workpiece W is started while slide 20 is moving between feed-allowable height P 5 and stand-by height P 6 , and transportation thereof is completed while slide 20 is moving between stand-by height P 0 and feed-allowable height P 1 .
  • Transportation of workpiece W and movement of slide 20 overlap in time.
  • main shaft 110 has been decelerated from maximum angular speed ⁇ max to zero by the time when slide 20 reaches stand-by height P 6 after it passed feed-allowable height P 5 . Therefore, servo motor 121 has also been decelerated by the time when slide 20 reaches stand-by height P 6 after it passed feed-allowable height P 5 . Transportation of workpiece W by leveler feeder 200 is started during deceleration of servo motor 121 .
  • stand-by height P 6 is desirably set at a position closer to feed-allowable height P 5 .
  • deceleration of main shaft 110 is started after slide 20 passes feed-allowable height P 5 . Therefore, while slide 20 is moving upward, deceleration of servo motor 121 is started after slide 20 passes feed-allowable height P 5 . Servo motor 121 has not yet been decelerated at the time of passage by feed-allowable height P 5 . Slide 20 passes feed-allowable height P 5 at the highest speed. By doing so, a time period for slide 20 to be moved from feed-allowable height P 1 across bottom dead center BDC to feed-allowable height P 5 can reliably be shortened.
  • main shaft 110 has been accelerated from a zero angular speed to maximum angular speed (max by the time when slide 20 reaches feed-allowable height P 1 after it starts movement from stand-by height P 0 . Therefore, servo motor 121 has also been accelerated while slide 20 is moving from stand-by height P 0 to feed-allowable height P 1 . Transportation of workpiece W by leveler feeder 200 is completed during acceleration of servo motor 121 .
  • stand-by height P 0 is desirably set at a position closer to feed-allowable height P 1 .
  • main shaft 110 has completed acceleration before slide 20 passes feed-allowable height P 1 . Therefore, as slide 20 is lowered, acceleration of servo motor 121 has been completed before slide 20 passes feed-allowable height P 1 . By the time point of passage by feed-allowable height P 1 , servo motor 121 has reached the highest speed. Slide 20 passes feed-allowable height P 1 at the highest speed. By doing so, a time period for slide 20 to be moved from feed-allowable height P 1 across bottom dead center BDC to feed-allowable height P 5 can reliably be shortened.
  • stand-by height P 0 and monitoring position Pa are set such that when completion of feed of workpiece W has not been detected at the time point when slide 20 lowered from stand-by height P 0 reaches monitoring position Pa, slide 20 can be stopped at stop position Pb higher than feed-allowable height P 1 . Even though an abnormal condition occurs during transportation of workpiece W, interference between workpiece W and a die can thus reliably be avoided.
  • the press apparatus is not limited to those of the construction described in the embodiment, and the press apparatus may be constructed such that a plunger and a plunger holder are interposed between the connecting rod and the slide.
  • An eccentric mechanism may have a crankshaft structure or a drum structure.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Control Of Presses (AREA)
US16/615,540 2017-09-22 2018-06-08 Press system Abandoned US20200171561A1 (en)

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JP2017182584A JP7080612B2 (ja) 2017-09-22 2017-09-22 プレスシステム
JP2017-182584 2017-09-22
PCT/JP2018/022064 WO2019058654A1 (ja) 2017-09-22 2018-06-08 プレスシステム

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US20200171561A1 true US20200171561A1 (en) 2020-06-04

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US16/615,540 Abandoned US20200171561A1 (en) 2017-09-22 2018-06-08 Press system

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CN (1) CN110520227B (zh)
DE (1) DE112018001445T5 (zh)
WO (1) WO2019058654A1 (zh)

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JP7220485B2 (ja) * 2021-02-15 2023-02-10 大野精工株式会社 プレス装置
DE102021126436B3 (de) * 2021-10-12 2023-01-05 Textor Maschinenbau GmbH Presseinrichtung

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JP3818748B2 (ja) * 1997-08-19 2006-09-06 株式会社小松製作所 サーボプレスの起動位置設定装置及びその方法
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WO2019058654A1 (ja) 2019-03-28
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JP2019055426A (ja) 2019-04-11
DE112018001445T5 (de) 2019-12-12
CN110520227B (zh) 2021-12-07

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