EP2703151A1 - Kurbelpresse mit zweifachem Schutzmechanismus und Steuerungsverfahren dafür - Google Patents

Kurbelpresse mit zweifachem Schutzmechanismus und Steuerungsverfahren dafür Download PDF

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Publication number
EP2703151A1
EP2703151A1 EP12182766.1A EP12182766A EP2703151A1 EP 2703151 A1 EP2703151 A1 EP 2703151A1 EP 12182766 A EP12182766 A EP 12182766A EP 2703151 A1 EP2703151 A1 EP 2703151A1
Authority
EP
European Patent Office
Prior art keywords
value
limit
strain
load
torque command
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.)
Withdrawn
Application number
EP12182766.1A
Other languages
English (en)
French (fr)
Inventor
Ya-Huei Guo
Tin-Chun Kuo
Jin-Hung Hsu
Ming-Yang Lin
Kuei-Chang Hsu
Yi-Wen Wang
Ju-Ru Tsai
Wei-Lun Hsu
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.)
Shieh Yih Machinery Industry Co Ltd
Original Assignee
Shieh Yih Machinery Industry Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shieh Yih Machinery Industry Co Ltd filed Critical Shieh Yih Machinery Industry Co Ltd
Priority to EP12182766.1A priority Critical patent/EP2703151A1/de
Publication of EP2703151A1 publication Critical patent/EP2703151A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/0094—Press load monitoring 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
    • B30B15/14—Control arrangements for mechanically-driven presses
    • B30B15/148—Electrical control arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/28—Arrangements for preventing distortion of, or damage to, presses or parts thereof

Definitions

  • the present invention relates to a crank press and a control method thereof, more particularly to a crank press with a dual protection mechanism and a control method thereof.
  • the punch device 900 includes a slider 90, a hydraulic tank 91 disposed in the slider 90, a cover block 92 disposed at a lateral wall of the slider 90, a hydraulic pump 93 disposed on the cover block 92, and an overload controller 94.
  • the slider 90 is formed with an opening 901 which communicates fluidly with the hydraulic tank 91.
  • the cover block 92 is disposed to cover the opening 901, and a hydraulic outlet 921 is formed through the cover block 92 and communicates fluidly with the opening 901.
  • the hydraulic pump 93 pumps hydraulic oil out of the hydraulic tank 91 and sends the hydraulic oil into a hydraulic cylinder 95 which is located above the hydraulic tank 91 via the hydraulic outlet 921.
  • the overload controller 94 detects pressure in the hydraulic cylinder 95.
  • a control system of the press machine may drive a clutch to disengage a power connection between the punch device 900 and a servo motor of the press machine, or may activate a brake for achieving an effect of overload protection.
  • control mechanism of the conventional hydraulic overload protector has the following drawbacks.
  • an object of the present invention is to provide a crank press which may be controlled precisely and which is provided with a dual protection mechanism, and a control method thereof.
  • a crank press comprises a machine body, a slider, a motor driver, a servo motor which is coupled to the slider and which is coupled to and driven by the motor driver to bring about movement of the slider with respect to the machine body, a command generator for generating a position command which is associated with control of the motor driver, an encoder, a strain detector module, a memory, and a controller.
  • the encoder measures an angle value associated with operation of the servo motor.
  • the strain detector module includes a strain detector unit and a strain control unit.
  • the strain detector module detects deformation of the machine body during movement of the slider within a pressing operation and generates a strain value corresponding to the deformation detected thereby.
  • the strain control unit receives the strain value from the strain detector unit and converts the strain value into a converted load value.
  • the memory stores at least one relation between an angle value and each of an upper torsion limit and an upper load limit corresponding thereto.
  • the controller includes a torsion control unit and a load control unit.
  • the torsion control unit receives the position command from the command generator and the angle value measured by the encoder, calculates a torque command value based on the position command, reads from the memory the upper torsion limit corresponding to the angle value received thereby, determines whether the torque command value exceeds the upper torsion limit, outputs the torque command value to the motor driver for driving the servo motor according to the torque command value when the torque command value does not exceed the upper torsion limit, and outputs the upper torsion limit to the motor driver for driving the servo motor according to the upper torsion limit when the torque command value exceeds the upper torsion limit.
  • the load control unit receives the converted load value from the strain control unit and the angle value measured by the encoder, reads from the memory the upper load limit corresponding to the angle value received thereby, determines whether the converted load value exceeds the upper load limit, and controls the motor driver to stop driving the servo motor when the converted load value exceeds the upper load limit.
  • a control method for a crank press that includes a machine body, a slider, a motor driver, a servo motor which is coupled to the slider and which is coupled to and driven by the motor driver to bring about movement of the slider with respect to the machine body, and a command generator for generating a position command which is associated with control of the motor driver.
  • the control method comprises the steps of:
  • step e) further includes generating an alarm when the converted load value exceeds the upper load limit.
  • the crank press with a dual protection mechanism and the control method thereof may have a torque feedback control function so as to implement a first overload protection mechanism.
  • the crank press and the control method thereof may implement a second overload protection mechanism.
  • a preferred embodiment of a crank press 100 with a dual protection mechanism comprises a machine body 11, a slider 12, a controller 13, a motor driver 141, a servo motor 142 which is coupled to the slider 12 and which is coupled to and driven by the motor driver 141, a command generator 17, an encoder 143, a strain detector module 15, and a memory 16.
  • the command generator 17 generates, based on a predetermined program or a user operation, a position command which is associated with control of the motor driver 141, and transmits the position command to the controller 13.
  • the controller 13 controls, based on the position command, the motor driver 141 to drive the servo motor 142 to bring about movement of the slider 12 with respect to the machine body 11 via a crankshaft and a connecting rod (not shown).
  • the controller 13 includes a torsion control unit 131 and a load control unit 132. Detailed operations thereof will be described in the following paragraphs.
  • the memory 16 stores at least one relation between an angle value and each of an upper torsion limit and an upper load limit corresponding thereto.
  • the relation is stored in a form of a table such as a lookup table 161 shown in Figure 3 .
  • the lookup table 161 stores predetermined angle values, upper torsion limits, and upper load limits.
  • the encoder 143 detects a rotational position of the servo motor 142, i.e., measures an angle value associated with operation of the servo motor 142, and provides the angle value measured thereby to the controller 13.
  • the strain detector module 15 obtains a converted load value associated with a pressing operation of the slider 12. The pressing operation is implemented by means of the movement of the slider 12 with respect to the machine body 11.
  • the strain detector module 15 includes a strain detector unit 151 and a strain control unit 152.
  • the strain detector unit 151 detects deformation of the machine body 11 during movement of the slider 12 within the pressing operation and generates a strain value corresponding to the deformation detected thereby.
  • the slider 12 is provided with a mold, and a workpiece is disposed on the machine body 11 corresponding to the mold.
  • the mold is bought by the slider 12 to press the workpiece, the workpiece simultaneously presses the machine body 11 and a reaction force is applied to the machine body 11 via the slider 12 (see the arrows depicted in Figure 2 ) so as to result in the elastic deformation of the machine body 11.
  • the strain detector unit 151 is disposed on lateral walls of the machine body 11 which in general have a substantially higher degree of instantaneous elastic deformation.
  • the strain control unit 152 receives the strain value from the strain detector unit 151 and converts the strain value into a converted load value. Specifically, the strain value and the converted load value have a substantially linear relationship therebetween, and a linear equation may be derived based on the linear relationship. Therefore, the strain control unit 152 converts the strain value into the converted load value according to the linear equation.
  • the strain detector unit 151 is a strain gauge
  • the strain control unit 152 is a tonnage monitor, such as that available from Murata Machinery, LTD, and variations thereof.
  • the torsion control unit 131 of the controller 13 performs steps 301-308, i.e., a first overload protection mechanism, and the load control unit 132 of the controller 13 performs steps 401-405, i.e., a second overload protection mechanism.
  • the first overload protection mechanism is illustrated hereinafter.
  • step 301 the torsion control unit 131 receives the angle value measured by the encoder 143.
  • step 302 the torsion control unit 131 receives the position command from the command generator 17.
  • steps 303 and 304 the torsion control unit 131 substitutes the position command and the angle value into a closed-loop logic operation so as to obtain a torque command value.
  • step 305 the torsion control unit 131 reads from the memory 16 the upper torsion limit corresponding to the angle value received thereby.
  • step 306 the torsion control unit 131 determines whether the torque command value exceeds the upper torsion limit.
  • step 307 the torsion control unit 131 outputs the torque command value to the motor driver 141 for driving the servo motor 142 according to the torque command value when the torque command value does not exceed the upper torsion limit.
  • step 308 the torsion control unit 131 outputs the upper torsion limit to the motor driver 141 for driving the servo motor 142 according to the upper torsion limit when the torque command value exceeds the upper torsion limit.
  • the second overload protection mechanism is illustrated hereinafter.
  • step 401 the load control unit 132 receives the converted load value from the strain control unit 152 and the angle value measured by the encoder 143.
  • step 402 the load control unit 132 reads from the memory 16 the upper load limit corresponding to the angle value received thereby.
  • step 403 the load control unit 132 determines whether the converted load value exceeds the upper load limit.
  • step 404 the load control unit 132 controls the motor driver 141 to drive the servo motor 142 to operate normally when the converted load value does not exceed the upper load limit.
  • step 405 the load control unit 132 controls the motor driver 141 to stop driving the servo motor 142 when the converted load value exceeds the upper load limit.
  • the crank press 100 further generates an alarm when the converted load value exceeds the upper load limit.
  • the second overload protection mechanism is designed because, during movement of the slider 12 within the pressing operation, an actual pressing force attributed to the pressing operation of the slider 12 is usually greater than a pressing force attributed to a capable output torque of the servo motor 142 for bringing about movement of the slider 12 as a result of an effect of inertia force. Therefore, in the preferred embodiment of the crank press 100, by means of the strain detector module 15, the strain detector unit 151 may detect deformation of the machine body 11 during movement of the slider 12 within the pressing operation, such that the controller 13 may implement an emergency shutdown or alarm generation according to the converted load value and the predetermined upper load limit so as to achieve an effect of active protection.
  • the present invention has a torque feedback control function so as to implement the first overload protection mechanism. Moreover, by means of the strain detector module 15 detecting deformation of the machine body 11 during movement of the slider 12 within the pressing operation, the present invention may implement the second overload protection mechanism.
  • the crank press 100 of the present invention thus has a dual protection mechanism.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Presses (AREA)
EP12182766.1A 2012-09-03 2012-09-03 Kurbelpresse mit zweifachem Schutzmechanismus und Steuerungsverfahren dafür Withdrawn EP2703151A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12182766.1A EP2703151A1 (de) 2012-09-03 2012-09-03 Kurbelpresse mit zweifachem Schutzmechanismus und Steuerungsverfahren dafür

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12182766.1A EP2703151A1 (de) 2012-09-03 2012-09-03 Kurbelpresse mit zweifachem Schutzmechanismus und Steuerungsverfahren dafür

Publications (1)

Publication Number Publication Date
EP2703151A1 true EP2703151A1 (de) 2014-03-05

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Application Number Title Priority Date Filing Date
EP12182766.1A Withdrawn EP2703151A1 (de) 2012-09-03 2012-09-03 Kurbelpresse mit zweifachem Schutzmechanismus und Steuerungsverfahren dafür

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EP (1) EP2703151A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016027645A1 (ja) * 2014-08-19 2016-02-25 コマツ産機株式会社 制御システム、プレス機械、及びプレス機械の制御方法
JP2018167328A (ja) * 2018-08-09 2018-11-01 コマツ産機株式会社 制御システム、プレス機械、及びプレス機械の制御方法
CN110239140A (zh) * 2019-06-13 2019-09-17 博众精工科技股份有限公司 一种基于输入整形的伺服压合设备压力控制方法
CN113946137A (zh) * 2020-07-15 2022-01-18 山东省科学院激光研究所 一种采用传动机构间隙速度限制的冲击抑制装置与方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5578000A (en) * 1978-12-06 1980-06-12 Komatsu Ltd Eccentric load monitoring device of pressing machine
GB2177832A (en) * 1985-07-01 1987-01-28 Charles Hoai Chi Method and apparatus for protecting press from being damaged by overload conditions
JP2004174562A (ja) * 2002-11-27 2004-06-24 Komatsu Ltd 電動サーボプレスの過負荷脱出方法
JP2004174591A (ja) * 2002-11-29 2004-06-24 Komatsu Ltd 電動サーボプレスの機械保護方法
US20110132208A1 (en) * 2009-12-04 2011-06-09 Hitachi, Ltd. Controlling Device for Servo Press, Controlling Method for the Same and Servo Press Equipped with the Controlling Device
US20120111207A1 (en) * 2010-11-09 2012-05-10 Aida Engineering, Ltd. Control device of servo press and method for controlling servo press

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5578000A (en) * 1978-12-06 1980-06-12 Komatsu Ltd Eccentric load monitoring device of pressing machine
GB2177832A (en) * 1985-07-01 1987-01-28 Charles Hoai Chi Method and apparatus for protecting press from being damaged by overload conditions
JP2004174562A (ja) * 2002-11-27 2004-06-24 Komatsu Ltd 電動サーボプレスの過負荷脱出方法
JP2004174591A (ja) * 2002-11-29 2004-06-24 Komatsu Ltd 電動サーボプレスの機械保護方法
US20110132208A1 (en) * 2009-12-04 2011-06-09 Hitachi, Ltd. Controlling Device for Servo Press, Controlling Method for the Same and Servo Press Equipped with the Controlling Device
US20120111207A1 (en) * 2010-11-09 2012-05-10 Aida Engineering, Ltd. Control device of servo press and method for controlling servo press

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016027645A1 (ja) * 2014-08-19 2016-02-25 コマツ産機株式会社 制御システム、プレス機械、及びプレス機械の制御方法
JP2016043359A (ja) * 2014-08-19 2016-04-04 コマツ産機株式会社 制御システム、プレス機械、及びプレス機械の制御方法
CN106536177A (zh) * 2014-08-19 2017-03-22 小松产机株式会社 控制系统、压力机及压力机的控制方法
CN106536177B (zh) * 2014-08-19 2019-11-19 小松产机株式会社 控制系统、压力机及压力机的控制方法
US10576705B2 (en) 2014-08-19 2020-03-03 Komatsu Industries Corporation Control system, press machine, and control method for press machine
JP2018167328A (ja) * 2018-08-09 2018-11-01 コマツ産機株式会社 制御システム、プレス機械、及びプレス機械の制御方法
CN110239140A (zh) * 2019-06-13 2019-09-17 博众精工科技股份有限公司 一种基于输入整形的伺服压合设备压力控制方法
CN110239140B (zh) * 2019-06-13 2021-06-15 博众精工科技股份有限公司 一种基于输入整形的伺服压合设备压力控制方法
CN113946137A (zh) * 2020-07-15 2022-01-18 山东省科学院激光研究所 一种采用传动机构间隙速度限制的冲击抑制装置与方法
CN113946137B (zh) * 2020-07-15 2024-06-04 山东省科学院激光研究所 一种采用传动机构间隙速度限制的冲击抑制装置与方法

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