WO2022025059A1 - ロボットシステム - Google Patents

ロボットシステム Download PDF

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Publication number
WO2022025059A1
WO2022025059A1 PCT/JP2021/027743 JP2021027743W WO2022025059A1 WO 2022025059 A1 WO2022025059 A1 WO 2022025059A1 JP 2021027743 W JP2021027743 W JP 2021027743W WO 2022025059 A1 WO2022025059 A1 WO 2022025059A1
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WO
WIPO (PCT)
Prior art keywords
robot
error
parameter
unit
reference point
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.)
Ceased
Application number
PCT/JP2021/027743
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English (en)
French (fr)
Japanese (ja)
Inventor
邦彦 原田
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.)
Fanuc Corp
Original Assignee
Fanuc Corp
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 Fanuc Corp filed Critical Fanuc Corp
Priority to US18/002,434 priority Critical patent/US12311542B2/en
Priority to CN202180060434.9A priority patent/CN116194252B/zh
Priority to JP2022539496A priority patent/JP7401682B2/ja
Priority to DE112021004072.3T priority patent/DE112021004072B4/de
Publication of WO2022025059A1 publication Critical patent/WO2022025059A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
    • B25J9/00—Program-controlled manipulators
    • B25J9/10—Program-controlled manipulators characterised by positioning means for manipulator elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
    • B25J9/00—Program-controlled manipulators
    • B25J9/16—Program controls
    • B25J9/1679—Program controls characterised by the tasks executed
    • B25J9/1692—Calibration of manipulator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
    • B25J9/00—Program-controlled manipulators
    • B25J9/16—Program controls
    • B25J9/1656—Program controls characterised by programming, planning systems for manipulators
    • B25J9/1664—Program controls characterised by programming, planning systems for manipulators characterised by motion, path, trajectory planning
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/39—Robotics, robotics to robotics hand
    • G05B2219/39055—Correction of end effector attachment, calculated from model and real position

Definitions

  • the present invention relates to a robot system.
  • the position of the reference point at the end of the robot is calculated based on the distance between the drive axes (link length) and the angular position of the drive axes.
  • an error may occur between the position of the reference point calculated from the angle command value of the drive shaft and the position where the reference point is actually positioned due to various factors. Therefore, it is being studied to compensate for the error between the theoretical position of the reference point and the actual position with respect to the command value to the robot by using a plurality of error parameters.
  • it has been proposed to install a three-dimensional measuring device in order to measure the actual position of the reference point see, for example, Patent Document 1).
  • the robot system includes a robot having a plurality of drive axes, a measuring device attached to the end of the robot, a target mark fixed to the work space of the robot, and a robot that controls the robot.
  • a control device, and the robot control device includes a parameter storage unit that stores a plurality of error parameters used for calculating the position of a reference point at the end of the robot, and the robot in consideration of the error parameters.
  • a command value generator that generates a command value indicating the position or speed of each drive shaft, a relative position of the target mark measured by the measuring device with respect to the measuring device, and the target mark.
  • a position information acquisition unit that acquires the position information of the reference point based on the coordinate position in the user coordinate system that specifies the operation of the robot, and a parameter that corrects the error parameter based on the command value and the position information. It has a correction unit and.
  • the robot control device it is possible to easily set an error parameter that enables accurate calculation of the position of the reference point of the robot.
  • FIG. 1 is a diagram showing a configuration of a robot system 1 according to an embodiment of the present disclosure.
  • the robot system 1 includes a robot 10, a measuring device 20, a target mark 30, and a robot control device 40.
  • the robot 10 has a plurality of drive shafts.
  • the robot 10 is typically a vertical articulated robot, but may be a scalar type robot, a parallel link type robot, a Cartesian coordinate type robot, or the like.
  • a work head 11 corresponding to a required work such as a processing head for processing a work and a holding head for holding the work, is attached to the end of the robot 10.
  • the measuring device 20 is attached to the end of the robot 10.
  • the measuring device 20 may be fixed to a work head 11 attached to the end of the robot 10, or may be fixed to a link at the end to which the work head 11 is attached.
  • the measuring device 20 is a three-dimensional laser scanner that measures the three-dimensional shape of the surface of an object using, for example, a laser, and calculates the distance to the subject for each plane position based on the disparity between the images taken by the two cameras. It is possible to use a three-dimensional vision sensor, a two-dimensional camera that calculates a three-dimensional relative position of the subject with respect to the measuring device 20 based on the target image stored in advance and the size thereof.
  • the measuring device 20 can also be used as a sensor for confirming the work during the work of the robot system 1.
  • the target mark 30 is fixed in the work space of the robot 10, and the coordinate position in the user coordinate system that specifies the operation of the robot 10 is specified in advance.
  • the robot system 1 is a reference point at the end of the robot based on the coordinate position of the known target mark 30 and the relative position between the measuring device 20 and the target mark 30 in the user coordinate system that specifies the operation of the robot 10. Measure the position and orientation.
  • the robot system 1 preferably includes a plurality of target marks 30 dispersedly arranged in the work space so that the relative position with the target mark 30 can be measured by the measuring device 20 in various postures of the robot 10. ..
  • the target mark 30 preferably has a shape such as a sphere or a cube having symmetry so that the measuring device 20 can specify the center position from any direction. Further, it is more preferable that the target mark 30 has a shape or pattern in which the measuring device 20 can recognize the direction thereof. "Shape or pattern" includes both shapes and patterns. Since the rough orientation of the target mark 30 can be specified from the posture of the robot 10, the shape or pattern of the target mark 30 may have characteristic points indicating the orientation at regular angular intervals.
  • the robot control device 40 controls the robot 10.
  • the robot control device 40 includes a parameter storage unit 41, a command value generation unit 42, a position information acquisition unit 43, a sensitivity calculation unit 44, a target selection unit 45, a parameter correction unit 46, an evaluation unit 47, and weights.
  • the configuration may include a determination unit 48 and a program generation unit 49.
  • the robot control device 40 can be realized by introducing an appropriate control program into a computer device having a CPU, a memory, and the like.
  • Each of the above components categorizes the functions of the robot control device 40, and may not be clearly distinguishable in the functions and the program structure.
  • the parameter storage unit 41 stores a plurality of error parameters used for calculating the accurate position of the reference point at the end of the robot 10 from the command value indicating the position or speed of each drive axis of the robot 10. .
  • the error parameters are the theoretical position (theoretical position) of the reference point calculated by the angle of each drive axis of the robot 10 and the distance between the drive axes, and the actual reference point caused by the mechanical error of the robot 10. It is set to compensate for the difference from the position (actual position).
  • the command value generation unit 42 In order to operate the robot according to the program, the command value generation unit 42 considers the error parameters stored in the parameter storage unit 41, and instructs the robot 10 the position or speed at which each drive shaft should be. To generate. That is, the command value generation unit 42 has a command value such that the position calculated using the error parameter (calculated position), that is, the position obtained by adding the correction by the error parameter to the theoretical position is the position required in the program. To generate.
  • the position information acquisition unit 43 determines the reference point at the end of the robot 10 based on the relative position of the target mark 30 measured by the measuring device 20 with respect to the measuring device 20 and the coordinate position of the target mark 30 in the user coordinate system. Acquires position information indicating the actual position (actual position). That is, in the position information acquisition unit 43, the coordinate system of the measuring device 20 and the position where the target mark 30 is fixed are determined based on the position and orientation of the target mark 30 in the coordinate system of the measuring device 20 measured by the measuring device 20. Identify the relationship with the specified user coordinate system.
  • the position information acquisition unit 43 calculates the coordinate position of the reference point of the measurement device 20 and the end of the robot 10 in the user coordinate system by converting the coordinate position of the target mark 30 in the coordinate system of the measurement device 20. ..
  • the user coordinate system may be a reference coordinate system based on the installation position of the robot.
  • the sensitivity calculation unit 44 calculates a sensitivity value indicating the magnitude (sensitivity) of the change amount of the calculation position (calculation position) of the reference point with respect to the change amount for each error parameter.
  • the sensitivity value may be an independent evaluation point, a ranking, or a rank value obtained by grouping the sensitivities.
  • the target selection unit 45 selects an error parameter to be calculated by the parameter correction unit 46 based on the sensitivity value calculated by the sensitivity calculation unit 44.
  • the target selection unit 45 may select a constant error parameter having a higher sensitivity value, or may select an error parameter having a sensitivity higher than a certain level, for example, the number of position information obtained based on a machining program or the like.
  • the number of error parameters to be selected may be increased or decreased according to the above.
  • the target selection unit 45 may select the error parameter to be calculated based on the weight set for each error parameter and the sensitivity value calculated by the sensitivity calculation unit 44. By weighting the sensitivity value calculated by the sensitivity calculation unit 44, priority is given to correction not only for errors that have a large effect in the state where position information is acquired, but also for error parameters that are predicted to have a large effect on the structure of the robot 10. You can raise the ranking and get the appropriate error parameters more quickly.
  • the parameter correction unit 46 corrects the error parameter based on the command value for the robot 10 output by the command value generation unit 42 and the position information acquired by the position information acquisition unit 43. At this time, the parameter correction unit 46 corrects only the error parameter to be corrected, assuming that the error parameters other than the correction target selected by the target selection unit 45 do not affect the position of the reference point of the robot 10.
  • the actual robot 10 Since the actual robot 10 has a very complicated mechanism, it is necessary to use an extremely large number of error parameters in order to reflect all the error factors. Further, since it affects the positioning error caused by various factors such as the configuration of the work head 11 and the operation pattern of the robot 10, the appropriate error parameter value depends on the processing mode, the configuration of the program for processing, and the like. Can change. Therefore, in order to calculate accurate values of all error parameters, it is necessary to position the robot 10 in various operation patterns and acquire a large amount of position information. For example, if the robot 10 is a 6-axis articulated robot, the number of combinations of required command values and position information exceeds 100.
  • the parameter correction unit 46 uses only a part of the error parameters selected by the target selection unit 45 as unknown variables to be calculated, and assumes that the other error parameters are invariant (constant at the current value).
  • the value of the error parameter selected by the target selection unit 45 so that the position of the actual reference point can be calculated more accurately from the command value by analyzing the relationship between the command value and the actual position (actual position) of the reference point. To correct. This makes it possible to obtain a set of error parameters that can relatively accurately identify the position of the reference point of the robot 10, although it is not necessarily exact, with a relatively small number of position information.
  • the sensitivity calculation unit 44, the target selection unit 45, and the parameter correction unit 46 may perform calculations for each of the position information. That is, every time the position information acquisition unit 43 acquires the position information, the sensitivity calculation unit 44 recalculates the sensitivity value, the target selection unit 45 reselects the correction target, and the parameter correction unit 46 corrects the error parameter. And may be done. As a result, the error parameter can be corrected step by step, and the error parameter can be surely optimized.
  • the evaluation unit 47 determines whether or not the deviation between the calculated position of the reference point calculated using the error parameter and the actual position of the reference point indicated by the position information is within a predetermined range. When the evaluation unit 47 determines that the deviation between the calculated position of the reference point of the robot 10 and the actual position is sufficiently small, the process for correcting the error parameter is stopped to effectively set the error parameter. The time it takes to get it can be shortened. The correction of the error parameter may be restarted when a predetermined event such as the operation stop of the robot system 1, the change of the machining program, or the emergency stop occurs.
  • the weight determination unit 48 determines the weight according to the content of the maintenance work performed on the robot 10. Therefore, the weight determination unit 48 may be configured to accept input of maintenance work contents by the operator. For example, when a motor is replaced, the error factors associated with the replaced motor may change, and therefore the associated error parameters may need to be significantly modified. In this way, by increasing the weight of the sensitivity value of the error parameter that is likely to need to be corrected by the maintenance work, the positioning error due to the maintenance work can be quickly compensated.
  • the weight of the sensitivity value of the error parameter is held for each measurement data, and the mechanical error parameter of the robot after the maintenance work is calculated using the measurement data before and after the maintenance work by switching the weight before and after the maintenance work. May be.
  • the program generation unit 49 generates an operation program that causes the robot 10 to take a plurality of postures so that the target mark 30 can be measured from a plurality of directions by the measuring device 20. Specifically, based on the coordinate position of the given target mark 30, the posture of the robot 10 is sequentially changed so that the measuring device 20 faces the target mark 30 from a plurality of predetermined directions at a fixed distance. Generate an operation program. This operation program may be generated so that the calculated position considering the error parameter stored in the parameter storage unit 41 at that time becomes the coordinate position determined based on the coordinate position of the target mark 30, and the error parameter may be generated. The theoretical position not considered may be generated so as to be a coordinate position determined based on the coordinate position of the target mark 30.
  • FIG. 2 shows a procedure for correcting an error parameter by the robot control device 40.
  • the error parameter correction includes an operation program generation process (step S1), a positioning process (step S2), a sensitivity value calculation process (step S3), a correction target selection process (step S4), and a position information acquisition process (step). It is performed by a method including S5), a parameter correction step (step S6), and an evaluation step (step S7).
  • the program generation unit 49 In the operation program generation step of step S1, the program generation unit 49 generates an operation program based on the coordinate position of the target mark 30.
  • the command value generation unit 42 In the positioning step of step S2, the command value generation unit 42 generates a command value for positioning the robot 10 according to the calibration program generated by the program generation unit 49.
  • the sensitivity calculation unit 44 calculates the sensitivity values for all the error parameters based on the command value and the position information.
  • the target selection unit 45 selects an error parameter having a higher sensitivity value as a correction target.
  • the position information acquisition unit 43 acquires the position information of the reference point of the robot 10, that is, measures the three-dimensional position of the reference point.
  • the parameter correction unit 46 corrects the error parameter selected in the correction target selection step so that the calculation position approaches the actual position, that is, the value of the error parameter stored in the parameter storage unit 41 is corrected. Correct.
  • the evaluation unit 47 determines the calculation position of the reference point of the robot 10 calculated from the command value generated by the command value generation unit 42 using the error parameter currently stored in the parameter storage unit 41. , It is confirmed whether or not the deviation of the reference point indicated by the position information acquired by the position information acquisition unit 43 from the actual position is within a predetermined range. If the deviation between the calculated position and the actual position is within a predetermined range, the error parameter stored in the parameter storage unit 41 is considered to be appropriate, and this process is terminated. If the deviation between the calculated position and the actual position is not within the predetermined range, the process returns to step S2, the robot 10 is positioned according to the next instruction of the calibration program, and the subsequent steps are repeated. In this way, by repeating the steps from step S2 to step S6, new information is acquired and error parameters are corrected repeatedly, the error parameters are corrected to more appropriate values, and the positioning accuracy of the robot is gradually improved. can.
  • the robot system 1 is compared in order to correct the error parameter by using the relative position between the measuring device 20 attached to the end of the robot 10 and the target mark 30 whose position is specified in the user coordinate system.
  • the configuration is simple, it is possible to easily set an error parameter that enables the position of the reference point of the robot 10 to be calculated accurately.
  • the program generation unit 49 generates an operation program for specifying the optimum posture of the robot 10 for correcting the error parameter, so that the error parameter can be corrected efficiently.
  • the robot control device 40 targets only a small number of error parameters whose sensitivity value is selected by the target selection unit 45, it is possible to obtain relatively accurate error parameters with a relatively small number of position information. That is, the robot system 1 can improve the positioning accuracy of the robot 10 relatively easily.
  • the robot system according to the present disclosure may correct the error parameter based on a plurality of position information, instead of correcting the error parameter each time the position information is acquired.
  • the robot system according to the present disclosure may select an error parameter to be corrected from preset candidates without using a sensitivity value. Further, the robot system according to the present disclosure may analyze all error parameters as unknown variables without limiting the correction target.
  • the user may provide an operation program for correcting the error parameter, or the error parameter may be corrected until the operation program is completed without evaluation by the evaluation unit. good.

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  • Engineering & Computer Science (AREA)
  • Robotics (AREA)
  • Mechanical Engineering (AREA)
  • Manipulator (AREA)
  • Numerical Control (AREA)
  • Automation & Control Theory (AREA)
  • Physics & Mathematics (AREA)
  • Artificial Intelligence (AREA)
  • Evolutionary Computation (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Software Systems (AREA)
PCT/JP2021/027743 2020-07-29 2021-07-27 ロボットシステム Ceased WO2022025059A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US18/002,434 US12311542B2 (en) 2020-07-29 2021-07-27 Robot system
CN202180060434.9A CN116194252B (zh) 2020-07-29 2021-07-27 机器人系统
JP2022539496A JP7401682B2 (ja) 2020-07-29 2021-07-27 ロボットシステム
DE112021004072.3T DE112021004072B4 (de) 2020-07-29 2021-07-27 Robotersystem

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Application Number Priority Date Filing Date Title
JP2020-127932 2020-07-29
JP2020127932 2020-07-29

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WO2022025059A1 true WO2022025059A1 (ja) 2022-02-03

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JP (1) JP7401682B2 (https=)
CN (1) CN116194252B (https=)
DE (1) DE112021004072B4 (https=)
WO (1) WO2022025059A1 (https=)

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