WO2025046702A1 - 工作機械のインデックス装置及びその制御方法 - Google Patents

工作機械のインデックス装置及びその制御方法 Download PDF

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Publication number
WO2025046702A1
WO2025046702A1 PCT/JP2023/030976 JP2023030976W WO2025046702A1 WO 2025046702 A1 WO2025046702 A1 WO 2025046702A1 JP 2023030976 W JP2023030976 W JP 2023030976W WO 2025046702 A1 WO2025046702 A1 WO 2025046702A1
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WO
WIPO (PCT)
Prior art keywords
machine tool
angle
index
index table
relative movement
Prior art date
Application number
PCT/JP2023/030976
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English (en)
French (fr)
Japanese (ja)
Inventor
昌宏 川田
Original Assignee
株式会社カワタテック
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.)
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Publication date
Application filed by 株式会社カワタテック filed Critical 株式会社カワタテック
Priority to PCT/JP2023/030976 priority Critical patent/WO2025046702A1/ja
Priority to JP2025528830A priority patent/JPWO2025046702A1/ja
Publication of WO2025046702A1 publication Critical patent/WO2025046702A1/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q16/00—Equipment for precise positioning of tool or work into particular locations not otherwise provided for
    • B23Q16/02—Indexing equipment
    • B23Q16/04—Indexing equipment having intermediate members, e.g. pawls, for locking the relatively movable parts in the indexed position
    • B23Q16/06—Rotary indexing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • B23Q3/18—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for positioning only

Definitions

  • This invention relates to an indexing device for a machine tool that machines a workpiece and a control method for the same.
  • the indexing device for a machine tool is equipped with an index table that indexes the workpiece, and a power transmission mechanism that transmits the extra relative movement between the spindle and main table of the machine tool to the rotational movement of the index table, in addition to the relative machining movement between the spindle and main table (see, for example, Patent Document 1).
  • This indexing device is installed on a machine tool and rotates the index table by the extra relative movement between the spindle and the main table. And because this indexing device rotates the index table by using the extra relative movement between the spindle and the main table of the machine tool, there is no need to have an electric, hydraulic or pneumatic drive device, and the configuration is simple and the cost is low. In addition, there is no need to install special electrical wiring, hydraulic piping or pneumatic piping for the drive device, so there are no space issues.
  • the amount of rotation of the index table relative to the amount of extra relative movement of the machine tool may differ for each machine tool depending on the structural characteristics and installation position of the machine tool on which the index device is installed. Therefore, even if the amount of extra relative movement of the machine tool is preset, it may not be possible to accurately rotate the index table to the specified angle.
  • the problem that this invention aims to solve is to provide an indexing device for a machine tool and a control method for the same that can accurately and easily rotate the index table to a specified angle.
  • an index device for a machine tool comprises: An indexing device for a machine tool that machines a workpiece, comprising: The indexing device is a housing to be installed on a main table of the machine tool; an index table that is rotatably supported by the housing and indexes the work; a power transmission mechanism for transmitting an extra relative movement between the spindle and the main table to the rotation of the index table in addition to the relative movement between the spindle and the main table of the machine tool for machining; an angle detection unit that detects the angle of the index table, The control unit of the machine tool is configured to use the angle detected by the angle detection unit to control the extra relative movement of the machine tool and rotate the index table to a predetermined angle.
  • the index device when the index device is installed on a machine tool, even if the index table is rotated by extra relative movement of the machine tool, the index table can be rotated accurately to a specified angle for each machine tool.
  • control unit uses the detected angle to feedback control the excess relative movement of the machine tool and rotate the index table to a predetermined angle.
  • the indexing device is feedback controlled using the detected angle, so that the index table can be rotated accurately to the specified angle even if a disturbance occurs in the motion transmission mechanism.
  • control unit includes a memory unit that uses the detected angle to store the coordinates of the extra relative movement of the machine tool relative to a specified angle of the index table, and controls the extra relative movement of the machine tool using a program that uses the coordinates for the specified angle as variables to rotate the index table to the specified angle.
  • the indexing device stores the coordinates of the extra relative movement of the machine tool for multiple predetermined angles of the index table, and by using a program in which the coordinates of the extra relative movement of the machine tool for multiple predetermined angles of the index table are used as variables, it is possible to quickly and accurately rotate the index table to a predetermined angle.
  • control unit inputs a skip signal when the detected angle reaches a predetermined angle.
  • the skip signal is input to the control unit of the machine tool based on the detected angle from the angle detection unit of the index table, making it possible to control the excess relative movement of the machine tool.
  • the power transmission mechanism is a push bar movably supported on the housing;
  • the housing further includes a push bar interlocking mechanism that is provided between the push bar and the index table and that interlocks with the push bar to rotate the index table.
  • a method for controlling an index device of a machine tool comprises the steps of:
  • a method for controlling an index device of a machine tool that machines a workpiece comprising the steps of:
  • the indexing device is a housing to be installed on a main table of the machine tool; an index table that is rotatably supported by the housing and indexes the work; a power transmission mechanism for transmitting an extra relative movement between the spindle and the main table to the rotation of the index table in addition to the relative movement between the spindle and the main table of the machine tool for machining;
  • the control method is detecting an angle of an index table; using the detected angle to cause an extra relative movement of the machine tool; and transmitting the extra relative movement of the machine tool to the rotation of the index table to rotate the index table to a predetermined angle.
  • the index table can be rotated accurately to a specified angle for each machine tool, even when excess relative movement of the machine tool is transmitted to the rotation of the index table.
  • the index device for a machine tool and the control method thereof according to the present invention can accurately rotate the index table to a specified angle.
  • FIG. 2 is a side view showing the index device and the machine tool.
  • FIG. FIG. FIG. 4 is an explanatory diagram showing a push bar interlocking mechanism.
  • FIG. 4 is a flowchart showing control of the index device and the machine tool in the first embodiment.
  • FIG. 4 is a flowchart showing control of a transmitter and a receiver in the first embodiment.
  • FIG. 11 is a flowchart showing control of an index device and a machine tool in a second embodiment.
  • FIG. 10 is a flowchart showing control of a transmitter and a receiver in the second embodiment.
  • the X-axis, Y-axis, and Z-axis are arranged at right angles to each other.
  • the index device 1 is configured separately from the machine tool 2 and is configured to be installed on the main table 20 of the machine tool 2 for use.
  • the index device 1 is configured to grip and index the workpiece W.
  • the machine tool 2 is configured to move the tool 210 attached to the spindle 21, thereby machining the workpiece W indexed by the index device 1.
  • the index device 1 includes a housing 11 and an index table 10.
  • the index table 10 is rotatably supported by the housing 11, and is configured so that a workpiece W is held on the index table 10.
  • the index table 10 is configured so as to be rotatable around a rotation axis 10a.
  • the indexing device 1 has a push bar 30 movably supported on the housing 11.
  • the machine tool 2 is equipped with a control unit 25.
  • the control unit 25 is a computer made up of a calculation unit such as a CPU, an auxiliary memory unit such as an HDD or SSD that stores various computer programs, a main memory unit such as a RAM that stores data for the calculation unit to execute the computer programs, an input unit such as a keyboard through which the operator enters data, and an output unit such as a display that displays information to the operator.
  • the control unit 25 moves the spindle 21 relative to the main table 20 and controls the spindle 21 to rotate at high speed, thereby machining the workpiece W indexed by the index device 1 installed on the main table 20.
  • control unit 25 generates an extra relative movement between the spindle 21 and the main table 20 in addition to the machining relative movement between the spindle 21 and the main table 20, and moves the push bar 30 by this extra relative movement.
  • the index device 1 is equipped with a power transmission mechanism 3 that transmits the excess relative movement between the spindle 21 of the machine tool 2 and the main table 20 to the rotation of the index table 10.
  • the power transmission mechanism 3 is provided inside the housing 11, and includes a lock mechanism 31 (Fig. 3) and a push bar interlocking mechanism 32 (Fig. 4).
  • the index table 10 is locked by the locking mechanism 31, and when the push bar 30 moves, the index table 10 is unlocked by the locking mechanism 31.
  • the locking mechanism 31 has a rod member 310, one end of which is formed with a toothed portion 311, which is configured to mesh with a gear (not shown) fixed to the index table 10.
  • the index table 10 is locked by the toothed portion 311 meshing with the gear of the index table 10.
  • a cam groove 313 is formed in the push bar 30, and a pin 312 is provided on the rod member 310 and inserted into the cam groove 313.
  • the cam groove 313 extends in the axial direction of the push bar 30 and is inclined obliquely.
  • the push bar interlocking mechanism 32 is provided between the push bar 30 and the index table 10 within the housing 11, and is interlocked with the push bar 30 to rotate the index table 10.
  • the push bar interlocking mechanism 32 has a feed pawl 321, which is attached to the push bar 30.
  • the push bar interlocking mechanism 32 also has a ratchet wheel 322, which is provided on the index table 10. As the push bar 30 moves, the feed pawl 321 engages with the teeth of the ratchet wheel 322, and the feed pawl 321 rotates the ratchet wheel 322 and the index table 10.
  • the index table 10 is rotated by the push bar interlocking mechanism 32.
  • control unit 25 causes additional relative movement between the spindle 21 and the main table 20, and first the spindle 21 and the tool 210 move in the XY directions to position the spindle 21 above the push bar 30. After that, the spindle 21 and the tool 210 move in the Z direction toward the push bar 30, the push bar 30 is pushed by the tool 210, and the index table 10 is unlocked by the locking mechanism 31.
  • the push bar 30 is then pushed by the spindle 21 and the tool 210, and the index table 10 is rotated by the push bar interlocking mechanism 32. Therefore, the workpiece W rotates integrally with the index table 10. After that, the spindle 21 and the tool 210 move away from the push bar 30, and the push bar 30 is returned to its original position by the spring 320.
  • the push bar 30 is then pushed by the spindle 21 and the tool 210, the push bar 30 returns to its original position by the spring 320, the push bar 30 pushes away again, and the index table 10 rotates again. This is repeated several times, and the index table 10 rotates by a predetermined angle. This causes the workpiece W to be indexed.
  • the spindle 21 and the tool 210 move away from the push bar 30 in the Z direction. Therefore, the index table 10 is locked by the locking mechanism 31.
  • the control unit 25 then causes relative machining movement between the spindle 21 and the main table 20, and the tool 210 is pressed against the workpiece W, and the workpiece W is machined by the tool 210.
  • the index device 1 is configured so that the index table 10 rotates due to the extra relative movement between the spindle 21 of the machine tool 2 and the main table 20, and due to the power transmission mechanism 3, so the index device 1 does not have a drive device such as a rotary motor for rotating the index table 10.
  • the indexing device 1 further includes an angle detection unit 4 that detects the angle of the index table 10.
  • the angle detection unit 4 is composed of an encoder connected to the rotation shaft 10a of the index table 10.
  • the indexing device 1 includes a transmitter 40 connected to the angle detection unit 4, and is configured so that a signal of the angle detected by the angle detection unit 4 is transmitted wirelessly or via wires by the transmitter 40.
  • the machine tool 2 also includes a receiver 23 that is configured to receive signals from the transmitter 40 wirelessly or via a wired connection.
  • the receiver 23 is connected to the control unit 25, and configured to sequentially send detected angle signals from the angle detection unit 4 to the control unit 25.
  • the control unit 25 uses the detected angle signals from the angle detection unit 4 to control the extra relative movement of the machine tool 2 and rotate the index table 10 to a specified angle.
  • the operator inputs and sets the target angle of the index table 10 into the control unit 25, and the target angle is stored in the memory unit 250 (FIG. 1) of the control unit 25 (step S10).
  • the control unit 25 then moves the spindle 21 in the X and Y directions to position it above the push bar 30 (step S11).
  • the control unit 25 transmits to the receiver 23 an operation start signal that starts the extra relative movement operation of the machine tool 2, and the set target angle (step S12).
  • the transmitter 40 sequentially transmits the current angle of the index table 10 detected by the angle detection unit 4 to the receiver 23 (step S30). Then, until the angle detected by the angle detection unit 4 from the receiver 23 reaches within the allowable range for the target angle, the transmitter 40 sequentially transmits the current angle of the index table 10 to the receiver 23 (step S31).
  • the tolerance for the target angle refers to the range of error (a few mm degrees) that is permitted for the target angle.
  • control unit 25 moves the spindle 21 in the Z direction to push the push bar 31 (step S13).
  • the index table 10 rotates (step S14).
  • the receiver 23 when the angle detected by the angle detector 4 from the transmitter 40 falls within the allowable range for the target angle, the receiver 23 outputs a skip signal (step S32). As shown in Fig. 5, the control unit 25 determines whether this skip signal has been input (step S15). When the skip signal has not been input, the control unit 25 determines whether the push bar 30 has reached the limit coordinate position (step S16).
  • the limit coordinate position refers to the coordinate of the spindle 21 up to the limit at which the push bar 30 can be pushed.
  • control unit 25 causes the spindle 21 to push the push bar 30 and rotate the index table 10 (steps S13, S14) until a skip signal is input (steps S15, S16).
  • step S15 and S16 If the push bar 30 reaches the limit coordinate position even though a skip signal has not been input (steps S15 and S16), the index table 10 cannot be rotated to the target angle, so the spindle 21 rises to lock the index table 10 (step S19) and the situation is treated as an indexing error (step S20).
  • the receiver 23 when the angle detected by the angle detector 4 from the transmitter 40 reaches within the allowable range for the target angle, the receiver 23 outputs a skip signal (step S32), and as shown in FIG. 5, the control unit 25 raises the spindle 21 and locks the index table 10 in response to the input of the skip signal (steps S15, S17).
  • the control unit 25 determines whether the angle detected by the angle detection unit 4 from the receiver 23 is within the allowable range for the target angle (step S18). Then, if the detected angle is within the allowable range of the target angle, the control unit 25 ends the operation of the extra relative movement of the machine tool 2. On the other hand, if the detected angle is not within the allowable range of the target angle, the control unit 25 returns to step S12, where it again transmits to the receiver 23 an operation start signal for starting the operation of the extra relative movement of the machine tool 2 and the set target angle (step S18).
  • control unit 25 is configured to constantly use the angle detected by the angle detection unit 4 to feedback control the excess relative movement of the machine tool 2 and rotate the index table 10 to the target angle.
  • a relative movement program for executing extra relative movements of the machine tool 2 is stored in the memory unit 250 of the control unit 25.
  • custom macro variables are assigned to a plurality of index angles at predetermined angle intervals in the index table 10. Therefore, as shown in FIG. 9, there is a variable list consisting of index angles and custom macro variables. Then, for each machine tool 2, coordinates are stored in the custom macro variables for each index angle, and the relative movement program is executed based on the custom macro variables in which the coordinates are stored. The procedure for storing coordinates in the custom macro variables for each index angle will be described below.
  • the operator inputs and sets a predetermined indexing angle of the index table 10 into the control unit 25, and the indexing angle is stored in the memory unit 250 (FIG. 1) of the control unit 25 (step S40).
  • the control unit 25 moves the spindle 21 in the XY directions to position it above the push bar 30 (step S41).
  • the control unit 25 transmits an operation start signal for starting the extra relative movement operation of the machine tool 2 and the set target angle to the receiver 23 (step S42).
  • the transmitter 40 sequentially transmits the current angle of the index table 10 detected by the angle detection unit 4 to the receiver 23 (step S50). Then, until the angle detected by the angle detection unit 4 from the receiver 23 reaches within the allowable range for the index angle, the transmitter 40 sequentially transmits the current angle of the index table 10 to the receiver 23 (step S51).
  • the tolerance for the index angle refers to the range of error (a few mm) permitted for the index angle.
  • control unit 25 moves the spindle 21 in the Z direction to push the push bar 31 (step S43).
  • the index table 10 rotates (step S44).
  • the receiver 23 when the angle detected by the angle detector 4 from the transmitter 40 reaches within the allowable range for the index angle, the receiver 23 outputs a skip signal (step S52). As shown in Fig. 7, the control unit 25 determines whether this skip signal has been input (step S45). When the skip signal has not been input, the control unit 25 determines whether the push bar 30 has reached the limit coordinate position (steps S45 and S46).
  • the limit coordinate position refers to the coordinate of the spindle 21 up to the limit at which the push bar 30 can be pushed.
  • control unit 25 causes the spindle 21 to push the push bar 30 and rotate the index table 10 (steps S43, S44) until a skip signal is input (steps S45, S46).
  • step S46 If the push bar 30 reaches the limit coordinate position even though a skip signal has not been input (step S46), the index table 10 cannot be rotated to the target angle, so the spindle 21 rises to lock the index table 10 (step S51) and the situation is treated as an indexing error (step S52).
  • step S52 when the detection angle of the angle detection unit 4 from the transmitter 40 reaches within the allowable range for the index angle, the receiver 23 outputs a skip signal (step S52), and as shown in FIG. 7, the coordinates of the spindle 21 are recorded in the temporary macro variables in the memory unit 250 of the control unit 25 (step S47).
  • a temporary macro variable is a custom macro variable that is configured to record coordinates when a skip signal is input. Then, the spindle 21 is raised and the index table 10 is locked (step S48).
  • the control unit 25 determines whether the angle detected by the angle detection unit 4 from the receiver 23 is within the allowable range for the index angle (step S49). If the detected angle is within the allowable range for the index angle, the coordinates of the temporary macro variable recorded in step S47 are recorded in the memory unit 250 of the control unit 25 as a custom macro variable for the index angle (step S50).
  • step S49 the control unit 25 returns to step S42, where it again transmits to the receiver 23 an operation start signal that starts the extra relative movement operation of the machine tool 2, and the set target angle.
  • coordinates can be recorded in the custom macro variables for multiple index angles.
  • coordinates are stored in the custom macro variables in a variable list consisting of index angles and custom macro variables. That is, for each machine tool 2, coordinates are stored in the custom macro variables for multiple index angles at predetermined angle intervals, and a relative movement program can be executed based on the custom macro variables for a predetermined index angle and their coordinates. Therefore, by executing a relative movement program based on the custom macro variables for a predetermined index angle and their coordinates without feedback control, the index table 10 can be rotated to a predetermined index angle.
  • the power transmission mechanism 3 of the index device 1 transmits the linear movement of the spindle 21 to the rotation of the index table 10 .
  • the power transmission mechanism 3 may transmit the rotation of the spindle 21 to the rotation of the index table 10 .
  • the extra relative movement of the machine tool 2 is performed by moving only the spindle 21.
  • only the main table 20 may move, or both the spindle 21 and the main table 20 may move.
  • the angle detection unit 4 may be, for example, a proximity sensor, an optical sensor, or a gyro sensor.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Machine Tool Positioning Apparatuses (AREA)
PCT/JP2023/030976 2023-08-28 2023-08-28 工作機械のインデックス装置及びその制御方法 WO2025046702A1 (ja)

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PCT/JP2023/030976 WO2025046702A1 (ja) 2023-08-28 2023-08-28 工作機械のインデックス装置及びその制御方法
JP2025528830A JPWO2025046702A1 (enrdf_load_stackoverflow) 2023-08-28 2023-08-28

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998025729A1 (fr) * 1996-12-13 1998-06-18 Citizen Watch Co., Ltd. Appareil d'indexage et son procede de commande et d'indexage
JP2001259969A (ja) * 2000-03-16 2001-09-25 Kawada Tekko Kk マシニングセンタのインデックス装置
JP2003159635A (ja) * 2001-09-17 2003-06-03 Koganei Corp 割出し装置
JP2008134861A (ja) * 2006-11-29 2008-06-12 Tsudakoma Corp 工作機械用回転割出し装置における駆動モータの駆動制御方法
JP2008155337A (ja) * 2006-12-26 2008-07-10 Toshiba Mach Co Ltd 割出装置
JP2020055083A (ja) * 2018-10-03 2020-04-09 川田鉄工株式会社 マシニングセンタのインデックス装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6339752A (ja) * 1986-08-02 1988-02-20 Kawada Tekko Kk インデツクス装置
JPH0756612A (ja) * 1993-08-11 1995-03-03 Fanuc Ltd 連続位置測定方式
JP2004205288A (ja) * 2002-12-24 2004-07-22 Mori Seiki Co Ltd 計測装置及びこれを備えた精度解析装置
JP2017091429A (ja) * 2015-11-17 2017-05-25 Dmg森精機株式会社 Ｎｃプログラム作成装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998025729A1 (fr) * 1996-12-13 1998-06-18 Citizen Watch Co., Ltd. Appareil d'indexage et son procede de commande et d'indexage
JP2001259969A (ja) * 2000-03-16 2001-09-25 Kawada Tekko Kk マシニングセンタのインデックス装置
JP2003159635A (ja) * 2001-09-17 2003-06-03 Koganei Corp 割出し装置
JP2008134861A (ja) * 2006-11-29 2008-06-12 Tsudakoma Corp 工作機械用回転割出し装置における駆動モータの駆動制御方法
JP2008155337A (ja) * 2006-12-26 2008-07-10 Toshiba Mach Co Ltd 割出装置
JP2020055083A (ja) * 2018-10-03 2020-04-09 川田鉄工株式会社 マシニングセンタのインデックス装置

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