WO1998057776A1 - Detecteur de position utilisant un palpeur a palier magnetique - Google Patents

Detecteur de position utilisant un palpeur a palier magnetique Download PDF

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Publication number
WO1998057776A1
WO1998057776A1 PCT/JP1998/002730 JP9802730W WO9857776A1 WO 1998057776 A1 WO1998057776 A1 WO 1998057776A1 JP 9802730 W JP9802730 W JP 9802730W WO 9857776 A1 WO9857776 A1 WO 9857776A1
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WO
WIPO (PCT)
Prior art keywords
magnetic bearing
tool
spindle
current
work
Prior art date
Application number
PCT/JP1998/002730
Other languages
English (en)
Japanese (ja)
Inventor
Yoshimasa Oda
Original Assignee
Seiko Seiki Kabushiki Kaisha
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 Seiko Seiki Kabushiki Kaisha filed Critical Seiko Seiki Kabushiki Kaisha
Publication of WO1998057776A1 publication Critical patent/WO1998057776A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
    • F16C32/0406—Magnetic bearings
    • F16C32/044—Active magnetic bearings
    • 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
    • B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
    • B23Q17/22—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring existing or desired position of tool or work
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2322/00—Apparatus used in shaping articles
    • F16C2322/39—General build up of machine tools, e.g. spindles, slides, actuators

Definitions

  • the present invention relates to a position detection device using a magnetic bearing spindle, and more particularly to a position detection device using a magnetic bearing spindle that can perform both processing and position detection using the same magnetic bearing spindle.
  • a separate probe (5) was required to determine the relative positional relationship between the spindle (1) of the machine tool (machining center) and the reference plane (line) of the work (3).
  • the evening probe (5) when the probe (5a) comes into contact with each part of the work (3), the X-Y coordinate or the X-Y-Z coordinate of the contact point is displayed.
  • the evening probe (5) is attached to the tip of the spindle (1).
  • the probe (5a) is extracted by touching the side surface which is the reference surface of the work (3).
  • the probe (5a) is extracted by contacting the tip of the probe (5a) with the upper surface which is the reference surface of the work (3).
  • FIG. 6 shows a state where the holding part (11) and the reel (13) are attached to the main shaft (1).
  • the XY coordinate position measured by the touch probe (5) differs from the actual processing position by the tool (13). Furthermore, this delicate mounting error is different every time the Tsutuchi probe (5) is attached and detached, and is poor in reproducibility and unstable. In addition, the evening probe (5) requires a separate power supply and display unit (7) in addition to the machine tool. Further, the subtle mounting error in the X-Y coordinate direction may be different depending on the rotation angle of the main shaft (1).
  • the present invention has been made in view of such conventional problems, and has as its object to provide a position detecting device using a magnetic bearing spindle that can perform both processing and position detection using the same magnetic bearing spindle. Aim. Disclosure of the invention
  • the present invention comprises at least one set of radial electromagnets for controlling the radial position of the spindle, an axial electromagnet for controlling the axial position of the spindle, and a tool attached to the tip of the spindle.
  • a magnetic bearing spindle movable on a spatial position coordinate or fixed at a predetermined position, a work machined by the magnetic bearing spindle, and a moving means for moving and / or fixing the work at a predetermined position; Due to the movement by the moving means or the magnetic bearing spindle, the radius at which the tool comes into contact with the work is adjusted.
  • Current change detecting means for detecting a change in current of at least one of the directional electromagnet and the axial electromagnet; spatial position coordinates where the tool is in contact with the workpiece based on the current change detected by the current change detecting means.
  • it is provided with a position calculating means for calculating the plane position coordinates.
  • the magnetic bearing spindle is stationary with the main shaft magnetically levitated in the air.
  • Magnetic bearing spindles are equipped with radial electromagnets to control the radial position of the spindle.
  • One set of radial electromagnets is provided for a three-axis control magnetic bearing, and two sets of radial electromagnets are provided in the axial direction for a five-axis control magnetic bearing.
  • the present invention is applicable regardless of the number of sets of radial electromagnets.
  • An axial electromagnet is provided to control the axial position of the main shaft.
  • a tool is attached to the tip of the spindle.
  • the magnetic bearing spindle is movable on a spatial position coordinate or fixed at a predetermined position, while the work is moved and / or fixed at a predetermined position by a moving means.
  • the moving means refers to all means capable of moving and fixing a work, such as a table or a robot. In the case of a table, the moving means is moved while being placed on the table, and then fixed or fixed at a predetermined position in advance. This work is processed by a magnetic bearing spindle. When processing, it is necessary to initially set the position where the work is placed or to confirm it appropriately.
  • the tool attached to the tip of the spindle is moved and / or the work is moved by moving means.
  • the current change detecting means detects a current change in the radial electromagnet and the axial electromagnet generated when the tool comes into contact with the workpiece.
  • the current change may be detected by a set of electromagnetic stones.However, in order to extract the current change more sensitively, the radius closer to the workpiece is used. It is desirable to detect with a directional electromagnet. Then, the position calculating means calculates spatial position coordinates or plane position coordinates at which the tool is in contact with the workpiece from the moving distance and the moving direction of the tool side and / or the work side based on the detected current change.
  • the tool has a cylindrical portion other than the cutting edge and has a predetermined length, the accuracy in the X-Y coordinate direction can be ensured by contacting the cylindrical portion with the workpiece. At this time, processing can be started continuously after the position is set or the position is confirmed.
  • the tool can be a cylinder with no cutting edge with the same length and diameter as the tool used for actual machining work only at the time of position setting or position confirmation. In this case, the position can be measured with high accuracy regardless of which part of the cylinder is brought into contact with the work. Thus, the tool may be changed according to the shape and size of the work.
  • the position setting and the like can be performed easily and inexpensively by modifying the magnetic bearing spindle and the existing computer software. No special power supply or equipment is required. Also, it can be linked with the processing work. Further, after confirming the space coordinate position, the trouble of manually setting the read value on the computer side is eliminated. Also, since the tool is used at the time of machining or the same length and diameter are used, the influence of errors due to the attachment and detachment of the tool can be minimized.
  • the spindle in the calculation of the plane position coordinates by the position calculation means, is rotated so as to make one rotation a plurality of times at equal rotation angles, and an average value of the plane position coordinates calculated for each time is calculated. It is characterized by plane position coordinates.
  • the main shaft is rotated so as to make one rotation by a plurality of equal rotation angles, and the average of the plane position coordinates calculated for each time is obtained.
  • the current change detecting means may include a bias current applied to the electromagnet such that detection of a current change of at least one of the radial electromagnet and the axial electromagnet can be performed even at an equal amplification factor. Is characterized by being smaller than the rated bias current. The detection of the current change by the radial magnet and the axial magnet can be increased by reducing the bias current applied to these electromagnets below the rated bias current, as the rigidity of the bearing becomes weaker. If the detected current change is completely distinguished from noise and is large enough to be compared with the low value by the current change detection means, no special amplifier is required. Therefore, since the amplifier is not required, the circuit can be simply and space-savingly constructed at a low cost. BRIEF DESCRIPTION OF THE FIGURES
  • FIG. 1 is a configuration diagram showing an embodiment of the present invention.
  • FIG. 2 is a diagram illustrating a state in which the tool is in horizontal contact with the workpiece.
  • FIG. 3 is a diagram showing a state in which the tool is in vertical contact with the workpiece.
  • FIG. 4 is a diagram illustrating a method of calculating plane position coordinates.
  • FIG. 5 is a diagram showing a situation where a separate probe is required separately to obtain the relative positional relationship between the main shaft of the machine tool and the workpiece.
  • Figure 6 is a diagram showing the holding group and the tool attached to the spindle.
  • a magnetic bearing spindle (20) is a five-axis control magnetic bearing and includes a radial electromagnet (21) on an upper side and a radial electromagnet (23) on a lower side. ing.
  • the radial electromagnet (21) controls the radial position of the upper side of the main shaft (1).
  • a metal disk (25) is fixed to the c- main shaft (1), which controls the radial position of the lower side of the main shaft (1) in the radial electromagnet (23).
  • the axial electromagnet (27) controls the axial position by attracting the metal disk (25).
  • the main shaft (1) is magnetically levitated in the air by a radial electromagnet (21), a radial electromagnet (23) and an axial electromagnet (27), and is rotated by a high frequency motor (29) (not shown). It is like that.
  • a tool (31) is attached to the tip of the spindle (1).
  • the tool (31) is a cylinder having no cutting edge with the same length and diameter as the cutting tool used for the actual machining operation.
  • the magnetic bearing spindle (20) is movable on spatial position coordinates.
  • the work (3) is placed on a table (33) and fixed at a predetermined position.
  • the current change detector (35) detects the current change that appears in the radial electromagnet (23) when the tool (31) comes into contact with the work (3) when the main shaft (1) is not rotating. It is supposed to. Further, the current change detector (45) detects a current change appearing in the axial electromagnet (27) generated when the tool (31) comes into contact with the work (3) when the main shaft (1) is not rotated.
  • the current change detector (35) and the current change detector (45) correspond to a current change detection means. Based on the current change detected by the current change detector (35) and the current change detector (45), the position calculator (37) calculates the position of the tool (1) from the moving distance and the moving direction of the spindle (1). 31) calculates spatial position coordinates or planar position coordinates in contact with the work (3), and corresponds to position calculating means.
  • the magnetic bearing spindle (20) is driven by passing a predetermined bias current through the radial electromagnets (21), the radial electromagnets (23) and the axial electromagnets (27). Magnetically levitated in the air.
  • the high-frequency motor (29) is not operating, and the main shaft (1) is stationary without rotating.
  • the magnetic bearing spindle (20) is moved in the X-Y coordinate direction toward the workpiece (3).
  • the tool (31) is brought into contact with a predetermined reference plane (line) of the workpiece (3) (Fig. 2 (B)).
  • the instant run-out of the tool (31) is transmitted to the spindle (1).
  • a current flows through the radial electromagnet (23) so that the instantaneous deflection of the main shaft (1) is suppressed.
  • the change in current at this time is shown in Fig. 2 (C).
  • the current change detector (35) detects this change in current. Changes in current are distinguished from noise by using a threshold or more.
  • the magnetic bearing spindle (20) is moved in the Z coordinate direction toward the work (3). Then, a predetermined reference plane (line) of the work (3) is brought into contact with the tool (31) (FIG. 3 (B)).
  • the instant run-out of the tool (31) is transmitted to the spindle (1).
  • a current flows through the axial electromagnet (27) so that the instantaneous deflection of the main shaft (1) is suppressed.
  • the change in current at this time is shown in Fig. 3 (C).
  • the current change detector (45) detects this change in current. Changes in current are distinguished from noise by using a threshold or more.
  • the position calculator (37) the current change detector (35) Based on the current change detected by the current change detector (45) and the current change detected by the current change detector (45), the spatial position coordinates of the tool (31) in contact with the work (3) are determined from the moving distance and moving direction of the spindle (1). Alternatively, plane position coordinates are calculated.
  • the magnitude of the current change of the radial electromagnet (23) or the axial electromagnet (27) varies depending on the rigidity of the magnetic bearing.
  • an amplifier (36) (not shown) can be used to detect a change in current. May be required. However, if the rigidity of the magnetic bearing is reduced, the change in current can be detected without using the amplifier (36).
  • the XY coordinate direction and the Z coordinate direction can be performed independently. The rigidity in the X-Y coordinate direction can be reduced by lowering the bias current of the radial electromagnet (23), and the rigidity in the Z coordinate direction can be reduced by lowering the bias current of the axial electromagnet (27). . Therefore, since the amplifier (36) is not required, the circuit can be simply configured, space-saving and inexpensive.
  • the tool (31) is a cylinder having no cutting edge with the same length and diameter as the tool used for actual machining work. This is to accurately grasp the spatial position coordinates and the like when the blade actually contacts the mark (3). However, when the tool (31) has a cylindrical portion in addition to the blade portion, the blade (31) may be used as it is. However, in order to accurately grasp the spatial position coordinates, the cylindrical part of the tool (31) is used for position measurement. In this case, processing can be started continuously after position setting or position confirmation. Thus, machining and position measurement can be performed using the same magnetic bearing spindle (20).
  • the rotation angle of the main shaft (1) is arbitrary Detecting the position with only one angle becomes more susceptible to the bias of the main shaft (1). Therefore, as shown in Fig. 4, the plane position coordinates are calculated by, for example, rotating the main spindle (1) three times at a constant rotation angle (120 degrees) so that one rotation is made. Calculate the plane position coordinates by making contact with (3) (3 points C1, C2 and C3 in Fig. 4). Then, an average of the calculated plane position coordinates is obtained, and this average value is used as the plane position coordinates. As a result, the influence on the plane position coordinates due to the deviation of the main shaft (1) can be minimized. Industrial applicability
  • the present invention by detecting a change in current of a radial electromagnet or the like when a tool attached to the front end of a spindle of a magnetic bearing spindle comes into contact with a work, the tool is brought into contact with the work. Since it is configured to calculate the calculated spatial position coordinates, it is possible to easily and inexpensively set the position by modifying the magnetic bearing spindle and existing computer software.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)
  • Turning (AREA)
  • Machine Tool Sensing Apparatuses (AREA)

Abstract

Ce détecteur de position utilisant un palpeur à palier magnétique permet à la fois de travailler et de détecter une position. On déplace ce détecteur de position à palpeur magnétique (20) vers une pièce (3) sur les coordonnées X-Y et on amène un instrument (31) à entrer en contact avec une surface (ligne) de référence préétablie de la pièce (3). Lorsque l'instrument (31) entre en contact avec la surface (ligne) de référence, l'écart immédiat dont il témoigne est transmis à la tige principale du palpeur (20). Un courant électrique est envoyé sur un électro-aimant radial (23) dans une direction visant à supprimer le courant induit par l'écart de la tige (1). Ce courant ayant subi des variations est détecté par un détecteur de variation de courant (35). Un détecteur de position (37) calcule à quel emplacement sur les coordonnées planimétriques l'instrument (31) arrive au contact de la pièce (3) et ce, au moyen de la distance de déplacement, de la direction du déplacement, etc., de la tige principale (1) en se fondant sur la variation du courant. La variation du courant dans la direction de la coordonnée Z, à savoir dans le sens vertical, est, de surcroît, calculée de la même manière à l'aide d'un électro-aimant (27) placé dans le sens axial, etc.
PCT/JP1998/002730 1997-06-18 1998-06-18 Detecteur de position utilisant un palpeur a palier magnetique WO1998057776A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP9/177645 1997-06-18
JP17764597A JPH1110487A (ja) 1997-06-18 1997-06-18 磁気軸受スピンドルを用いた位置検出装置

Publications (1)

Publication Number Publication Date
WO1998057776A1 true WO1998057776A1 (fr) 1998-12-23

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PCT/JP1998/002730 WO1998057776A1 (fr) 1997-06-18 1998-06-18 Detecteur de position utilisant un palpeur a palier magnetique

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WO (1) WO1998057776A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007085419A1 (fr) * 2006-01-25 2007-08-02 Robert Bosch Gmbh Procédé et dispositif pour contrôler des caractéristiques d'un élément d'outil
WO2020174585A1 (fr) * 2019-02-26 2020-09-03 国立大学法人東海国立大学機構 Dispositif de coupe et programme d'identification de position de contact

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6328541A (ja) * 1986-07-16 1988-02-06 Fuaasuto Giken:Kk 工作機械におけるワ−ク等の原点設定方法
JPH01252343A (ja) * 1988-03-30 1989-10-09 Seiko Seiki Co Ltd 接触位置検出装置および該装置を用いた工作機械
JPH0232868B2 (fr) * 1984-09-08 1990-07-24 Ntn Toyo Bearing Co Ltd

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0232868B2 (fr) * 1984-09-08 1990-07-24 Ntn Toyo Bearing Co Ltd
JPS6328541A (ja) * 1986-07-16 1988-02-06 Fuaasuto Giken:Kk 工作機械におけるワ−ク等の原点設定方法
JPH01252343A (ja) * 1988-03-30 1989-10-09 Seiko Seiki Co Ltd 接触位置検出装置および該装置を用いた工作機械

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007085419A1 (fr) * 2006-01-25 2007-08-02 Robert Bosch Gmbh Procédé et dispositif pour contrôler des caractéristiques d'un élément d'outil
WO2020174585A1 (fr) * 2019-02-26 2020-09-03 国立大学法人東海国立大学機構 Dispositif de coupe et programme d'identification de position de contact
US11883973B2 (en) 2019-02-26 2024-01-30 National University Corporation Tokai National Higher Education And Research System Cutting apparatus and contact position specifying program

Also Published As

Publication number Publication date
JPH1110487A (ja) 1999-01-19

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