WO2023105633A1 - 砥石車のドレス方法及びドレス装置 - Google Patents

砥石車のドレス方法及びドレス装置 Download PDF

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Publication number
WO2023105633A1
WO2023105633A1 PCT/JP2021/044953 JP2021044953W WO2023105633A1 WO 2023105633 A1 WO2023105633 A1 WO 2023105633A1 JP 2021044953 W JP2021044953 W JP 2021044953W WO 2023105633 A1 WO2023105633 A1 WO 2023105633A1
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WO
WIPO (PCT)
Prior art keywords
grinding
dressing
grinding wheel
conditions
threshold
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/JP2021/044953
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English (en)
French (fr)
Japanese (ja)
Inventor
新樹 伊藤
聡太 小林
和寛 佐藤
剛正 北野
肇 伊藤
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.)
Kuroda Precision Industries Ltd
Original Assignee
Kuroda Precision Industries 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 Kuroda Precision Industries Ltd filed Critical Kuroda Precision Industries Ltd
Priority to PCT/JP2021/044953 priority Critical patent/WO2023105633A1/ja
Priority to JP2023565736A priority patent/JPWO2023105633A1/ja
Priority to CN202180096420.2A priority patent/CN117062690A/zh
Priority to TW111128581A priority patent/TWI895622B/zh
Publication of WO2023105633A1 publication Critical patent/WO2023105633A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/25—Drives or gearings; Equipment therefor for compensating grinding wheel abrasion resulting from dressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B53/00—Devices or means for dressing or conditioning abrasive surfaces

Definitions

  • the present invention relates to a method and device for dressing a grinding wheel in a grinding device.
  • Patent Document 1 As a device for detecting the dressing time of the grinding wheel in the grinding machine, the standard power consumption of the electric motor that drives the grinding wheel is compared with the power consumption during grinding. It is known that it is time to dress (for example, Patent Document 1).
  • the dressing of the grinding wheel should be done just enough to maintain proper grinding and to control the wear of the grinding wheel.
  • an algorithm for setting the dressing timing according to the grinding conditions has not been established.
  • the experience and knowledge of experts are not effectively used to set reproducible dressing times.
  • One aspect of the present invention for solving the above-mentioned problems is a grinding wheel dressing method, wherein the grinding load is monitored and operated by an operator while grinding is performed under predetermined grinding conditions using the grinding wheel. storing the load at the time when the trigger signal generating device generates the trigger signal as a dressing threshold in a storage medium together with the grinding conditions, and reading out the dressing threshold corresponding to the grinding conditions from the storage medium when performing the next grinding; The dressing threshold is used to dress the grinding wheel.
  • the reproducible dressing timing is set by effectively utilizing the operator's experience and knowledge regarding the dressing timing of the grinding wheel, and the grinding wheel is appropriately dressed with good reproducibility.
  • one aspect of the present invention is to monitor the grinding load under predetermined grinding conditions using a grinding wheel, and dress the grinding wheel to be prescribed according to the grinding conditions.
  • the setting of the dressing timing with reproducibility is appropriately performed by effectively utilizing the operator's experience and knowledge regarding the dressing timing of the grinding wheel, and the dressing of the grinding wheel is appropriately performed with good reproducibility.
  • the grinding load includes the power value of the electric motor that rotationally drives the grinding wheel or the rotational speed of the grinding wheel.
  • the grinding load can be monitored with high accuracy and excellent responsiveness.
  • the grinding conditions include the type of the grinding wheel, the material of the workpiece to be ground, the presence or absence of heat treatment of the workpiece, the rotation speed of the grinding wheel, the depth of cut for grinding, and the feed speed of the workpiece. including.
  • the storage medium preferably stores the dressing condition including the dressing amount and the rotational speed of the grinding wheel during dressing, together with the dressing threshold.
  • a grinding wheel dressing device comprising: a load monitoring device for monitoring the grinding load of the grinding wheel; A storage medium for storing the load indicating the arrival of time as a dressing threshold along with the grinding conditions, a trigger signal generating device operated by an operator to generate a trigger signal, and a grinding condition for a workpiece to be ground is stored in the storage medium. If pre-existing in the medium, dressing of the grinding wheel is performed when the load in grinding the workpiece reaches the corresponding dressing threshold, and for the workpiece to be ground, the grinding conditions are stored in the storage. and a dressing control device for storing the load at the time when the trigger signal generating device generates the trigger signal as the dressing threshold in the storage medium together with the grinding conditions, if not existing in the medium.
  • the setting of the dressing timing with reproducibility is appropriately performed by effectively utilizing the operator's experience and knowledge regarding the dressing timing of the grinding wheel, and the dressing of the grinding wheel is appropriately performed with good reproducibility.
  • the grinding load includes the power value of the electric motor that rotationally drives the grinding wheel or the rotational speed of the grinding wheel.
  • the grinding load can be monitored with high accuracy and excellent responsiveness.
  • reproducible setting of the dressing timing is appropriately performed by effectively utilizing the experience and knowledge of the skilled person regarding the dressing timing of the grinding wheel.
  • FIG. 1 is a perspective view showing an embodiment of a grinding apparatus suitable for implementing the grinding wheel dressing method and the grinding dressing method according to the present invention
  • FIG. Block diagram showing the control system of the grinding machine Flowchart showing a control flow according to one embodiment of the same grinding apparatus Flowchart showing a control flow according to another embodiment of the same grinding machine
  • the grinding device 10 is a surface grinding machine, and includes a bed (base) 11 fixedly arranged on the floor and a Y-axis table provided on the bed 11 so as to be movable in the Y-axis direction (back and forth direction). 12 and an X-axis table 14 provided on a Y-axis table 12 so as to be movable in the X-axis direction (horizontal direction).
  • a dresser 16 for dressing a grinding wheel 24, which will be described later, is attached to the end of the X-axis table 14 in the left-right direction.
  • a threshold for determining the timing of dressing the grinding wheel 24 (hereinafter referred to as a dressing threshold) is set with respect to the index indicating the grinding load. is executed.
  • a grinding load index is not particularly limited, but in the present embodiment, as an example of the grinding load index, the power value or the spindle rotation speed of the spindle motor 32 (see FIG. 2) is used. explain.
  • the grinding apparatus 10 includes a column 18 integrated with the bed 11, a spindle head 20 provided on the column 18 so as to be movable in the Z-axis direction (vertical direction), a spindle 22 provided on the spindle head 20, A disk-shaped grinding wheel 24 is replaceably attached to the spindle 22 .
  • the spindle head 20 is provided with a spindle motor (electric motor) 32 such as an induction motor for rotating the grinding wheel 24 .
  • Movement of the Y-axis table 12, the X-axis table 14, and the spindle head 20 in each axial direction is performed by a feed screw device (not shown) for each axis.
  • the grinding machine 10 has a Y-axis motor 26, an X-axis motor 28 and a Z-axis motor 30 that drive the feed screw devices of each axis.
  • a control device 40 that controls the grinding device 10 has a computerized numerical controller (CNC) 42 , a spindle inverter 44 and a programmable logic controller (PLC) 46 .
  • CNC computerized numerical controller
  • PLC programmable logic controller
  • the CNC 42 includes an electronically controlled processor that executes NC programs, and controls the Y-axis motor 26, X-axis motor 28 and Z-axis motor 30.
  • movement of the Y-axis table 12 in the Y-axis direction, movement of the X-axis table 14 in the X-axis direction, and movement of the spindle head 20 in the Z-axis direction are controlled.
  • the workpiece W on the X-axis table 14 is ground while the grinding wheel 24 is rotated by the spindle motor 32 .
  • the spindle inverter 44 receives a voltage command from a spindle speed setting unit 50 including a volume knob 51 (see FIG. 1) provided in the cabinet 41 of the control device 40, and adjusts the drive power for the spindle 22 based on the voltage command. Control. Thereby, the rotation speed of the spindle 22, in other words, the rotation speed of the grinding wheel 24 is controlled.
  • the PLC 46 has a PLC body 47 including a processor that executes a ladder program, an internal register 52 including rewritable storage elements for various parameters related to grinding and dressing, and a recipe storage function section 53 .
  • the PLC 46 includes a Y-axis speed select switch 54 provided in the cabinet 41, an input unit 56 such as a touch panel, a display unit 58 such as a liquid crystal panel, a dress set button (trigger signal generator) 60, a flash memory (SD card), and the like.
  • a storage device (storage medium) 62 is connected.
  • the PLC 46 is bus-connected to the CNC 42 and communicatively connected to the spindle inverter 44 .
  • the dress set button 60 is operated by the operator at any time during the grinding of the work W by the grinding wheel 24, that is, while the work W is being ground, and this operation generates a trigger signal indicating that the dressing time has come. and outputs the trigger signal to the control device 40 .
  • the control device 40 includes, as a monitoring device for monitoring the grinding load, a power detection unit 45 that detects the power value (voltage value) of the spindle motor 32, and a rotation speed of the spindle motor 32 (rotation speed of the grinding wheel 24).
  • a spindle rotation speed detector 34 is connected.
  • the PLC 46 inputs the power value of the spindle motor 32 detected by the power detector 45 and the spindle rotation speed detected by the spindle rotation speed detector 34 .
  • the power value of the spindle motor 32 increases as the grinding load increases.
  • the rotation speed of the spindle motor 32 decreases as the grinding load increases.
  • either the spindle rotation speed detection unit 34 or the power detection unit 45 may be provided.
  • the input unit 56 is operated by the operator and used to input the grinding range of the workpiece W, the grinding conditions, the dressing conditions of the grinding wheel 24, and the dressing threshold value (default value). Each of these input items is transferred from the input section 56 to the internal register 52 of the PLC 46 and stored in the internal register 52 .
  • the grinding range of the workpiece W is determined by the coordinate values of the grinding device 10 in the Y-axis direction and the X-axis direction. Grinding conditions for the workpiece W include the type of grinding wheel 24, the material of the workpiece W, the presence or absence of heat treatment of the workpiece W, the total removal amount, the amount of grinding cut, the amount of finish cut, the number of spark-outs, the X-axis feed rate, the left and right Feed speed, cross feed speed, machining range, spindle speed, etc.
  • the X-axis feed speed, the lateral feed speed, and the longitudinal feed speed belong to the work W feed speed.
  • the spindle speed belongs to the speed of the grinding wheel 24 .
  • Dressing conditions for the grinding wheel 24 include a threshold for dressing depending on the electric power value of the spindle motor 32 or the rotation speed of the grinding wheel 24 (spindle rotation speed), the amount of dressing cut, the rotation speed of the grinding wheel 24 (spindle rotation speed), and the forward/backward feed. speed, etc.
  • the dressing threshold is an index that indicates the advent of the time to dress the grinding wheel 24 .
  • the dressing threshold is set for each grinding condition and stored in the storage device 62 as a recipe paired with the grinding condition for each grinding condition.
  • a collection of recipes for each grinding condition stored in the storage device 62 is called a database 63 .
  • Dressing thresholds include those based on the power value of the main shaft motor 32 and those based on the rotation speed of the main shaft motor 32 .
  • the PLC 46 reads out the dressing threshold from the storage device 62 together with the grinding conditions, if the dressing threshold exists as one recipe in the storage device 62 together with the grinding conditions of the workpiece W to be ground.
  • the PLC 46 monitors the power value or rotation speed of the spindle motor 32 while grinding the workpiece W, and determines that it is time to dress the grinding wheel 24 when the power value or rotation speed reaches the read-out dressing threshold value.
  • a command to dress the grinding wheel 24 is output to the CNC 42 and the spindle inverter 44 .
  • dressing of the grinding wheel 24 is executed by the dresser 16 according to the dressing conditions specified in the corresponding recipe.
  • the PLC 46 monitors the generation of a trigger signal based on the operation of the dress set button 60 when the storage device 62 does not have a dress threshold corresponding to the grinding conditions of the workpiece W to be ground.
  • the dress set button 60 is operated by the operator at any time during the grinding of the workpiece W.
  • the operator operates the dress set button 60 when it is determined that it is time to dress the grinding wheel 24 based on observation of the actual grinding conditions such as the degree of occurrence of sound, vibration and sparks during the grinding operation of the workpiece W. do.
  • a trigger signal is generated by operating the dress set button 60 .
  • the PLC 46 sets the power value or rotation speed of the spindle motor 32 at the time of generation of the trigger signal in the internal register 52 as the dress threshold. After the grinding of one workpiece W is completed, the PLC 46 stores the dressing threshold written in the internal register 52 as one recipe in the database 63 of the storage device 62 together with the grinding conditions of the workpiece W by the recipe storage function unit 53. Write.
  • the asset (skill) related to determining the arrival of the dressing time based on the experience and knowledge of the expert will be used to set the dress threshold.
  • the PLC 46 performs the dressing including the grinding conditions and the dressing threshold described in the recipe. Transfer the condition to internal register 52 . Then, the control device 40 automatically grinds the workpiece W and dresses the grinding wheel 24 based on the grinding conditions and dressing conditions including the dressing threshold described in the recipe transferred to the internal register 52 .
  • the grinding wheel 24 can be appropriately dressed while effectively utilizing the dressing assets of the skilled operator, even if the skilled operator is absent.
  • the database 63 of the storage device 62 is searched for a recipe for the workpiece W to be ground next as a registered recipe (step S10). If there is no registered recipe (No at step S10), the database 63 is searched for a registered recipe containing at least one condition close to the grinding condition of the workpiece W to be ground next (step S11). These searches may be performed by an operator.
  • step S11 If there is no registered recipe containing conditions close to the grinding conditions of the workpiece W to be ground next in the database 63 (No at step S11), manual grinding of the workpiece W is started by the operator's operation (step S12). Manual grinding is performed while the operator adjusts the grinding conditions. Further, the operator determines that it is time to dress while adjusting the dressing conditions while observing the degree of generation of sound, vibration and spark during manual grinding of the workpiece W.
  • the dress threshold is set by the PLC 46 (step S14).
  • control device 40 starts automatic grinding under the adjusted grinding conditions. Then, the control device 40 monitors whether the power value of the spindle motor 32 detected by the power detector 45 or the spindle rotation speed detected by the spindle rotation speed detector 34 reaches the dress threshold. When the power value of the spindle motor 32 or the spindle rotation speed reaches the dressing threshold value, the control device 40 executes dressing (automatic dressing) of the grinding wheel 24 according to the adjusted dressing conditions (step S15).
  • step S16 Automatic grinding and automatic dressing are performed until the grinding of one workpiece W is completed.
  • the PLC 40 registers the grinding conditions and dressing threshold values of the grinding process that has been performed so far as one recipe in the database 63 of the storage device 62 (step S17).
  • step S11 If there is a registered recipe containing conditions close to the grinding conditions of the workpiece W to be ground next in the database 63 (Yes at step S11), the recipe is read from the storage device 62 by the operator's operation, and the grinding conditions of the recipe are set. It is set in the control device 40 (step S18).
  • manual grinding of the workpiece W is started by the operator's operation (step S19).
  • Manual grinding is performed while the operator adjusts grinding conditions other than the grinding conditions from the recipe. Further, the operator determines that it is time to dress while adjusting the dressing conditions while observing the degree of generation of sound, vibration and spark during manual grinding of the workpiece W.
  • the dress threshold is set by the PLC 46 (step S21).
  • control device 40 executes steps S15 to S17 described above.
  • step S10 If there is a registered recipe (Yes at step S10), the recipe is read from the database 63 of the storage device 62 into the PLC 52 under the operator's operation (step S22). When the reading is completed, automatic control by the control device 40 performs automatic grinding according to the grinding conditions of the recipe and automatic dressing according to the dressing threshold and dressing conditions of the recipe until the machining of one workpiece W is completed (step S23, step S24)
  • control routine indicated by this control flow is executed by the control device 40 .
  • the grinding conditions (recipes) stored in the database 63 of the storage device 62 are searched (step S30), and it is determined whether or not the grinding conditions for the next grinding are in the database 63 (step S31). This determination may include fuzzy search and similarity search in addition to perfect match.
  • step S31 If there are no grinding conditions (No at step S31), the operator or communication, etc. newly sets the grinding conditions to create a new recipe (step S32), and the workpiece W is ground according to the grinding conditions according to the new recipe (step S36).
  • step S34 it is determined whether or not the recipe has a dressing threshold value (step S34). If there is no dressing threshold (No at step S34), the workpiece W is ground under the grinding conditions described in the corresponding recipe (step S36). Also in this embodiment, the dress threshold value may be based on the power value of the spindle motor 32 or the number of rotations of the spindle.
  • step S34 If there is a dress threshold (Yes at step S34), the dress threshold is read from the database 63 and set in the control device 40 (step S35). After that, the workpiece W is ground according to the grinding conditions described in the corresponding recipe (step S36).
  • step S37 it is determined whether or not the recipe being used has a dress threshold (step S37). If there is no dressing threshold value (No at step S37), it is determined whether or not it is time to set a new dressing threshold value while the workpiece W is being ground (step S38). This determination is triggered by the operation of the dress set button 60 by the operator. When there is no trigger input (No at step S38), the end of grinding of the workpiece W is monitored (step S39).
  • step S38 When there is a trigger input (Yes at step S38), the power value or rotation speed of the spindle motor 32 at the time of trigger input is set as a dressing threshold value and stored in the database 63, that is, written to the corresponding recipe (step S40). At the same time, the grinding is stopped and the grinding wheel 24 is dressed (step S42).
  • step S41 it is determined whether or not the power value or rotation speed of the spindle motor 32 is at the dress threshold value.
  • the grinding is stopped and the grinding wheel 24 is dressed (step S42).
  • step S43 the end of grinding of the workpiece W is monitored.
  • the control device 40 is not limited to those including the CNC 42 and PLC 46, and may include a microcomputer.
  • the grinding apparatus 10 may be one in which the Y-axis table 12 is omitted and the column 18 moves in the Y-axis direction with respect to the bed 11 .
  • the grinding wheel 24 may be dressed not by the dresser 16 provided on the X-axis table 14 but by a rotary dressing method.
  • the spindle motor 32 may be controlled by a motor or a motor drive circuit other than an inverter-controlled induction motor.
  • Axial feed of the Y-axis table 12 and the X-axis table 14 may be hydraulically driven.
  • the Y-axis speed select switch 54, the dress set button 60 and the like may be provided on the bed 11 and the like.
  • the grinding wheel dressing method and dressing apparatus according to the present invention can also be applied to various machine tools other than surface grinders.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
PCT/JP2021/044953 2021-12-07 2021-12-07 砥石車のドレス方法及びドレス装置 Ceased WO2023105633A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PCT/JP2021/044953 WO2023105633A1 (ja) 2021-12-07 2021-12-07 砥石車のドレス方法及びドレス装置
JP2023565736A JPWO2023105633A1 (https=) 2021-12-07 2021-12-07
CN202180096420.2A CN117062690A (zh) 2021-12-07 2021-12-07 砂轮的修整方法以及修整装置
TW111128581A TWI895622B (zh) 2021-12-07 2022-07-29 研磨輪的修整方法及修整裝置

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PCT/JP2021/044953 WO2023105633A1 (ja) 2021-12-07 2021-12-07 砥石車のドレス方法及びドレス装置

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2859753B2 (ja) * 1991-03-25 1999-02-24 オークマ株式会社 導電性砥石のツルーイング方法
JP5039875B2 (ja) * 2009-11-24 2012-10-03 セイコーインスツル株式会社 ドレス装置、ドレス方法、及び数値制御プログラム
JP2021013984A (ja) * 2019-07-11 2021-02-12 株式会社ディスコ ドレス方法

Family Cites Families (9)

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Publication number Priority date Publication date Assignee Title
JPH03251366A (ja) * 1990-02-28 1991-11-08 Kubota Corp 砥石車のドレッシング時期検出装置
JP2000006020A (ja) * 1998-06-22 2000-01-11 Toshiba Mach Co Ltd 研削盤における半自動ドレッシング方法
JP2000135675A (ja) * 1998-10-28 2000-05-16 Okamoto Machine Tool Works Ltd 研削装置
JP2002086342A (ja) * 2000-09-13 2002-03-26 Toshiba Mach Co Ltd 研磨布の初期ドレッシング方法
CN103313822B (zh) * 2011-01-21 2016-04-20 株式会社捷太格特 磨削异常监视方法以及磨削异常监视装置
JP6926626B2 (ja) * 2016-04-28 2021-08-25 株式会社ジェイテクト 研削盤システム
WO2018163390A1 (ja) * 2017-03-09 2018-09-13 黒田精工株式会社 研削方法及び研削装置
JP7120958B2 (ja) * 2019-04-19 2022-08-17 ファナック株式会社 ドレッシング推定装置、及び制御装置
JP2021102247A (ja) * 2019-12-25 2021-07-15 株式会社ナガセインテグレックス 回転工具を用いた加工方法及び工作機械

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2859753B2 (ja) * 1991-03-25 1999-02-24 オークマ株式会社 導電性砥石のツルーイング方法
JP5039875B2 (ja) * 2009-11-24 2012-10-03 セイコーインスツル株式会社 ドレス装置、ドレス方法、及び数値制御プログラム
JP2021013984A (ja) * 2019-07-11 2021-02-12 株式会社ディスコ ドレス方法

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CN117062690A (zh) 2023-11-14

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