WO2020079756A1 - Automatic tool exchanger - Google Patents

Automatic tool exchanger Download PDF

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Publication number
WO2020079756A1
WO2020079756A1 PCT/JP2018/038507 JP2018038507W WO2020079756A1 WO 2020079756 A1 WO2020079756 A1 WO 2020079756A1 JP 2018038507 W JP2018038507 W JP 2018038507W WO 2020079756 A1 WO2020079756 A1 WO 2020079756A1
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WO
WIPO (PCT)
Prior art keywords
tool
indexing
breakage
contact
automatic
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PCT/JP2018/038507
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French (fr)
Japanese (ja)
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WO2020079756A8 (en
Inventor
水田賢治
原口貴文
Original Assignee
株式会社Ｆｕｊｉ
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Application filed by 株式会社Ｆｕｊｉ filed Critical 株式会社Ｆｕｊｉ
Priority to PCT/JP2018/038507 priority Critical patent/WO2020079756A1/en
Priority to JP2020551636A priority patent/JP7030206B2/en
Publication of WO2020079756A1 publication Critical patent/WO2020079756A1/en
Publication of WO2020079756A8 publication Critical patent/WO2020079756A8/en

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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
    • B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
    • B23Q17/09—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring cutting pressure or for determining cutting-tool condition, e.g. cutting ability, load on tool
    • 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
    • B23Q3/155—Arrangements for automatic insertion or removal of tools, e.g. combined with manual handling
    • 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
    • B23Q3/155—Arrangements for automatic insertion or removal of tools, e.g. combined with manual handling
    • B23Q3/157—Arrangements for automatic insertion or removal of tools, e.g. combined with manual handling of rotary tools

Definitions

  • the present invention relates to an automatic tool changer with a tool breakage detection function for checking the presence or absence of breakage by contacting the cutting edge of a tool.
  • a touch sensor is arranged on the movement locus of the tool exchange arm, and when the tool exchange arm moves, pulls out the tool, and turns, the touch sensor waiting on the movement locus detects breakage of the tool edge. Done. Then, if the touch sensor is not in contact, it is determined that the tool is broken.
  • the first conventional example that uses an optical sensor may be affected by the coolant scattered in the machining chamber of the machine tool, causing erroneous detection due to refraction of light.
  • the sharp blade edge may diffract the light projected from the light projector and reach the light receiver without being blocked, which may also cause erroneous detection.
  • the tool breakage detection device is installed on the turning locus of the tool changing arm where the tool is transferred from the tool magazine to the spindle, or at the position where the magazine drum that moves forward and backward turns to change the tool with the spindle.
  • the installation position of such a tool breakage detection device is in the processing chamber where the tool is moved by the drive device, which is difficult to assemble with a small machine tool or the like, and is not preferable because chips and couran of the work are scattered.
  • an object of the present invention is to provide an automatic tool changer with a tool breakage detection function in order to solve such a problem.
  • An automatic tool changer is a tool indexing device that moves a plurality of tools held by a holding member in an upright posture along an oval path and stops a predetermined tool at an indexing position on the path. And a replacement tool displacement device that moves the tool at the indexing position to a replacement position with a mating device, and a contactor by an elevating mechanism corresponding to the height of the cutting edge of the tool on the path of the tool in the tool indexing device.
  • a tool breakage detection device that moves the tool, and a breakage determination device that determines the breakage of the tool based on a detection signal transmitted from the tool breakage detection device according to the presence or absence of contact of the contact with the cutting edge of the tool.
  • the tool indexing device moves the tool along the path of the oval, and the indexing tool further moves to the replacement position by the replacement tool displacement device, thereby exchanging the tool with the partner device. Is done.
  • the contact of the tool breakage detection device moves according to the height of the cutting edge, and a detection signal is sent to the breakage determination device according to the presence or absence of contact, and the tool breakage is detected. To be judged.
  • FIG. 1 is a perspective view of an internal structure showing a machining center.
  • the machining center 1 is entirely covered with a machine body cover, and a machining chamber for performing cutting work of a work is formed inside the machine center cover.
  • this machining center 1 is movable on the base 3 in the front-rear direction, and is assembled on a movable bed 11 having wheels.
  • the machining center 1 is provided with a spindle head 12 that holds a tool for machining a work piece in the front part.
  • the spindle head 12 has a spindle chuck 13 on which tools such as a drill, a reamer, and boring can be attached and detached, and a spindle motor 14 for rotating the tool held by the spindle chuck 13 is provided.
  • a chuck device 15 that rotatably grips a work to be processed is assembled below the spindle head 12.
  • the spindle head 12 is incorporated in a machining drive device for moving a tool mounted on the spindle chuck 13 in three axial directions with respect to a workpiece.
  • the Y-axis slide 21 is mounted movably in the machine longitudinal direction
  • the X-axis slide 22 is mounted movably in the machine width direction with respect to the Y-axis slide 21.
  • a Z-axis slide 23 is mounted on the X-axis slide 22 so as to be vertically movable
  • the spindle head 12 is mounted on the Z-axis slide 23.
  • FIG. 2 is a perspective view showing the automatic tool changer in a state of exchanging tools.
  • the automatic tool changer 10 is incorporated in a magazine main body 24, and normally, an opening / closing door 25 is closed as shown in FIG. 1 so that coolant and cutting dust scattered by machining a work can be shielded.
  • the opening / closing door 25 is opened as shown in FIG. 2, and a part of the automatic tool changer 10 is moved to the outside in accordance with the opening / closing door 25.
  • various types of tools T are mounted on the automatic tool changer 10, a concrete shape is omitted in FIG. 2 and all are represented by a cylindrical shape (the same applies to other drawings).
  • the automatic tool changer 10 is configured with a tool indexing device 10A that detachably holds a tool T by a tool holder 31 and moves the tool T to a predetermined position.
  • the tool holder 31 is configured such that the neck portion of the tool T is sandwiched by a pair of gripping claws.
  • a plurality of tool holders 31 are attached to an endless roller chain 33 at regular intervals.
  • the roller chain 33 is spanned by two sprockets 32 separated from each other in an elliptical shape, and its rotation is controlled by a drive motor (not shown).
  • a plurality of tools T are moved in the circumferential direction by the rotating roller chain 33, and the tool Tx to be used and the empty tool holder 31 can be indexed.
  • the tool indexing device 10A is assembled on the oval movable table 35, and the tool changing device 10B enables the reciprocating movement in the machine longitudinal direction.
  • the tool Tx indexed by the tool indexing device 10A and the empty tool holder 31 are configured to move to the tool exchange position 101 with the spindle chuck 13 outside the magazine body 24.
  • a guide rail 36 is laid on the inner bottom surface of the magazine body 24, and a guide block 37 of the movable table 35 is slidably fitted to the guide rail 36.
  • a nut constituting a ball screw is fixed to the lower side of the movable table 35, and a screw shaft 39 connected to the rotation shaft of the drive motor 38 is screwed into the nut.
  • the drive motor 38 is fixed to the magazine body 24 side. Therefore, the screw shaft 39 is rotated by the output from the drive motor 38, and the tool indexing device 10A is moved forward and backward in the longitudinal direction of the oval, that is, in the machine longitudinal direction.
  • the automatic tool changer 10 will be described with the opening / closing door 25 side as the front and the drive motor 38 side as the rear.
  • the automatic tool changer 10 is provided with a tool breakage detection device 10C for checking a tool breakage status such as a blade spill.
  • 3 to 5 are diagrams showing the tool breakage detection device 10C.
  • FIG. 3 is a perspective view showing the automatic tool changer 10 including the tool breakage detection device 10C from the rear side.
  • 4 is a plan view showing the rear part of the automatic tool changer 10
  • FIG. 5 is a side view showing the tool breakage detection device 10C.
  • the light emitter 501 and the light receiver 502 are provided for the tool T in the backward reversal position 203. Then, the breakage detection is performed depending on whether or not the cutting edge of the tool T passing through the backward reversal position blocks the light 510.
  • the tool breakage detection device that uses the optical sensor in this manner has difficulty in erroneous detection and adjustment as described in the above problem. Therefore, in the tool breakage detection device 10C of the present embodiment, there is a configuration in which the touch sensor 41 arranged at the tool detection position 201 can be moved in the vertical direction to match the cutting edge height of the tool Td that is various detection targets. Has been taken.
  • the tool breakage detection device 10C has a slide 42 that can move in the vertical direction, from which an arm 43 extends horizontally toward the front, and a touch sensor 41 is attached to the tip thereof.
  • a detection device main body 45 is fixed to the magazine main body 24 via a bracket 44, and the slide 42 is slidably attached to a guide 46 formed on the side surface thereof.
  • a drive motor 38 of the changeable tool displacement device 10B is installed at the center in the width direction. Therefore, the detection device body 45 is fixed at a position displaced from the center so as to avoid the drive motor 38, and the tool detection position 201 is provided in front of the backward reversal position 203.
  • the tool Td located at the tool detection position 201 is represented by a rod shape with a specific shape omitted so that the contact with the touch sensor 41 can be easily imagined.
  • a ball screw mechanism is provided inside the detection device body 45. That is, the screw shaft is assembled in the vertical direction via the bearing, and the nut member fixed to the slide 42 is screwed onto the screw shaft. Therefore, when the screw shaft rotates, the slide 42 integrated with the nut member can move vertically. Further, a servo motor 47 is fixed to the upper part of the detection device main body 45, and a belt is hung on a pulley fixed to a rotation shaft and a screw shaft of the detection device main body 45. The rotation control of the servo motor 47 enables positioning of the touch sensor 41. Has become.
  • the touch sensor 41 is configured such that when it comes into contact with the cutting edge of the tool Td such as a drill, the switch serving as the internal b contact is cut off and an OFF signal is sent to the control device 19 of the machining center 1.
  • the memory of the control device 19 stores the drive control of the automatic tool changer 10 that performs the breakage detection, and the breakage determination program for determining the presence or absence of the breakage based on the detection signal transmitted from the touch sensor 41. .
  • the switch of the touch sensor 41 may use an a contact.
  • the machining center 1 has a touch-panel operation display device attached to the front of the machine.
  • the operation display device is capable of displaying work information, operation screens, and the like, as well as allowing a worker to input dimensions of various tools T. Therefore, the height of the cutting edge is calculated by inputting the dimension value of the tool T to be used from the operation display device, and the rotation control of the servo motor 47 is performed based on the value when the breakage is detected. ing. Further, a holder number is assigned to each of the plurality of tool holders 31, and the relationship between the number and the dimension value of the attached tool T is managed. Therefore, even for the tools T having different sizes, the tool Td at the tool detection position 201 is obtained by the holder number, and the control for adjusting the height of the touch sensor 41 for each tool T is possible.
  • the operation of the automatic tool changer 10 will be described.
  • the tool T mounted on the spindle head 12 is rotated, and the workpiece gripped by the chuck device 15 is machined by drive control of the machining drive device in three axial directions.
  • the tool T in the spindle head 12 is exchanged according to the change in the machining content of the work W.
  • the roller chain 34 is rotated and the empty holder 31 not holding the tool T is sent to the indexing position 205, and then the opening / closing door 25 is opened and the movable table 35 is moved to the position shown in FIG. Move to the position shown in.
  • the empty tool holder 31 is placed at the tool exchange position 101, where the used tool T is delivered from the spindle head 12.
  • the roller chain 34 is rotated, the tool Tx to be replaced is sent to the indexing position 205, that is, the tool replacement position 101, and is delivered to the spindle head 12.
  • the movable table 35 is returned into the magazine body 24, and the opening / closing door 25 is closed.
  • the used tool T is sent as the detection target tool Td to the tool detection position 201 by the rotation of the roller chain 34, and the tool breakage detection device 10C detects the breakage.
  • the rotation of the servo motor 47 is converted into the movement of the slide 42 via the ball screw mechanism, and the height of the touch sensor 41 is adjusted. Specifically, the touch sensor 41 standing by at the lowered position moves up to the preset cutting edge height of the tool Td by driving the servo motor 47. At that time, when the touch sensor 41 comes into contact with the cutting edge of the tool Td, a detection signal indicating normality is sent to the control device 19, and it is determined that there is no abnormality in the tool Td. On the other hand, when the tool Td has a blade spill, the touch sensor 41 does not contact the blade tip, so that a detection signal indicating an abnormality is sent to the control device 19 and the tool Td is determined to be abnormal. To be done.
  • the touch sensor 41 mechanically detects that the blade edge of the tool Td is in contact, erroneous detection like an optical sensor does not occur. If erroneous detection occurs, especially if the cutting edge is determined to be broken even though the cutting edge is normal, a machining error has occurred on the workpiece, and it is necessary to temporarily stop the machining center 1 for tool replacement. The cycle time is greatly extended. In this respect, in the present embodiment, since the condition of the cutting edge is determined by the presence / absence of contact of the touch sensor 42, erroneous detection is eliminated, and unnecessary driving stop of the machining center 1 does not occur.
  • the tool breakage detection device 10C detects the breakage by moving the touch sensor 41 up and down, it is possible to deal with tools Td having different sizes, and it is not necessary to perform troublesome adjustment work unlike the optical sensor. . Further, since the operator sets and inputs the dimension value of the tool T to be mounted on the automatic tool changer 10 by the operation display device, the rotation control of the servo motor 47 according to the height of the cutting edge is performed, so that a plurality of different values are obtained. It is possible to easily deal with the handling of the tool T, the replacement of the tool, and the like.
  • the automatic tool changer 10 of the present embodiment is built in the magazine body 24, and the tool Tx indexed by the tool indexing device 10A and the like are moved by the replacement tool displacing device 10B, so that the entire structure is compact. ing.
  • the tool breakage detection device 10C is provided on the rear side of the automatic tool changer 10 like the replacement tool displacement device 10B, there is no effect on the machining chamber of the machining center 1 that executes cutting work or the like.
  • the processing chamber can be downsized, which leads to downsizing of the machining center 1.
  • the automatic tool changing device 10 configured to arrange the tool Tx to be processed at the tool changing position 101 by moving the tool indexing device 10A for indexing the tool T by the replacement tool displacement device 10B.
  • the tool indexing device may hold a plurality of tool holders
  • the exchange tool displacement device may arrange the tool extracted from the tool indexing device by the tool exchange arm to the tool exchange position.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automatic Tool Replacement In Machine Tools (AREA)
  • Machine Tool Sensing Apparatuses (AREA)
  • Drilling And Boring (AREA)

Abstract

An automatic tool exchanger with a tool breakage detection function, comprising: a tool-indexing device for moving multiple tools that are held by a holding member in an upright position along an elliptical path, and stopping a prescribed tool at an indexing position on the path; a replacing tool displacement device for moving the tool at the indexing position to the position for exchange with a partner device; a tool breakage detection device for positioning a contact according to the height of the tool edge of the tools on the tool path in the tool-indexing device, and moving the same by means of a vertical motion mechanism; and a breakage assessment device for assessing breakage of the tools on the basis of detection signals transmitted from the tool breakage detection device in accordance with the presence or absence of contact of said contact with the tool edges of the tools.

Description

自動工具交換機Automatic tool changer
　本発明は、工具の刃先への接触によって折損有無を確認する工具折損検知機能付きの自動工具交換機に関する。 The present invention relates to an automatic tool changer with a tool breakage detection function for checking the presence or absence of breakage by contacting the cutting edge of a tool.
　マシニングセンタなどの工作機械は、工具に刃こぼれ等の折損が生じていた場合に加工寸法に狂いなどが生じてしまうため、工具の折損を検知するための工具折損検知装置が設けられている。例えば、第１従来例としては、ローラチェーンの回転によって周回移動する工具の進路上に光センサが設置され、光の遮断の有無によって工具の状況を検知する工具折損検知装置がある。また、第２従来例として、下記特許文献１には、タッチセンサを使用した工具折損検知装置が開示されている。具体的には、工具交換アームの移動軌跡上にタッチセンサが配置され、工具交換アームが移動して工具を抜き出して旋回する際、その移動軌跡上に待機するタッチセンサによって工具刃先の折損検知が行われる。そして、タッチセンサが非接触であれば工具に折損が生じているとの判定が行なわれる。 Machine tools such as machining centers are equipped with a tool breakage detection device to detect breakage of the tool because the machining dimensions will be misaligned if the tool has breakage such as blade spillage. For example, as a first conventional example, there is a tool breakage detection device in which an optical sensor is installed on the path of a tool that is revolved by the rotation of a roller chain, and the condition of the tool is detected by the presence or absence of interruption of light. Further, as a second conventional example, Patent Literature 1 below discloses a tool breakage detection device using a touch sensor. Specifically, a touch sensor is arranged on the movement locus of the tool exchange arm, and when the tool exchange arm moves, pulls out the tool, and turns, the touch sensor waiting on the movement locus detects breakage of the tool edge. Done. Then, if the touch sensor is not in contact, it is determined that the tool is broken.
特開平１１－９０７８６号公報JP-A-11-90786
　しかし、光センサを使用した第１従来例は、工作機械の加工室内に飛散するクーラントの影響を受け、光の屈折などによって誤検知が生じてしまうことがある。また、尖った工具の刃先は、投光器から投射された光が回折してしまい、遮られることなく受光器に到達することがあり、やはり誤検知が生じ得る。また、光センサは、投光器と受光器について正確な折損検知を行なうための調整が難しかった。複数の種類の工具について折損検知を行う場合、工具によって検知する高さが異なってしまうと、異なる数だけ光センサが必要となり、更に調整作業が煩わしくなる。 However, the first conventional example that uses an optical sensor may be affected by the coolant scattered in the machining chamber of the machine tool, causing erroneous detection due to refraction of light. In addition, the sharp blade edge may diffract the light projected from the light projector and reach the light receiver without being blocked, which may also cause erroneous detection. Further, it has been difficult to adjust the optical sensor to accurately detect breakage of the light transmitter and the light receiver. When detecting breakage for a plurality of types of tools, if the heights to be detected differ depending on the tools, a different number of optical sensors are required, which further complicates the adjustment work.
　次に、タッチセンサを使用した第２従来例は、複数の工具が収納されたツールマガジンから主軸に移し換えられる過程で、工具について折損検知が行われる。そのため、工具折損検知装置は、ツールマガジンから主軸に工具が移し換えられる工具交換アームの旋回軌跡上や、前後進するマガジンドラムが旋回して主軸と工具交換する位置に設置される。そうした工具折損検知装置の設置位置は、駆動装置によって工具が移動する加工室内にあり、小型の工作機械などでは組み付けが難しくなるほか、ワークの切粉やクーランが飛散するため好ましくない。 Next, in the second conventional example that uses a touch sensor, breakage detection is performed on tools in the process of transferring from a tool magazine that stores multiple tools to a spindle. Therefore, the tool breakage detection device is installed on the turning locus of the tool changing arm where the tool is transferred from the tool magazine to the spindle, or at the position where the magazine drum that moves forward and backward turns to change the tool with the spindle. The installation position of such a tool breakage detection device is in the processing chamber where the tool is moved by the drive device, which is difficult to assemble with a small machine tool or the like, and is not preferable because chips and couran of the work are scattered.
　そこで、本発明は、かかる課題を解決すべく、工具折損検知機能付きの自動工具交換機を提供することを目的とする。 Therefore, an object of the present invention is to provide an automatic tool changer with a tool breakage detection function in order to solve such a problem.
　本発明の一態様における自動工具交換機は、起立した姿勢で保持部材によって保持した複数の工具を、長円形の進路に従って移動させ、所定の工具を進路上の割出し位置に停止させる工具割出し装置と、前記割出し位置の工具を相手装置との交換位置に移動させる交換工具変位装置と、前記工具割出し装置における工具の進路上にある工具の刃先高さに対応させ、昇降機構によって接触子を移動させる工具折損検知装置と、工具の刃先に対する前記接触子の接触の有無に従い前記工具折損検知装置から送信される検知信号に基づいて工具の折損を判定する折損判定装置とを有する。 An automatic tool changer according to an aspect of the present invention is a tool indexing device that moves a plurality of tools held by a holding member in an upright posture along an oval path and stops a predetermined tool at an indexing position on the path. And a replacement tool displacement device that moves the tool at the indexing position to a replacement position with a mating device, and a contactor by an elevating mechanism corresponding to the height of the cutting edge of the tool on the path of the tool in the tool indexing device. A tool breakage detection device that moves the tool, and a breakage determination device that determines the breakage of the tool based on a detection signal transmitted from the tool breakage detection device according to the presence or absence of contact of the contact with the cutting edge of the tool.
　前記構成によれば、工具割出し装置によって工具が長円形の進路に従って移動し、割出しされた工具が交換工具変位装置によって交換位置へと更に移動することにより、相手装置との間で工具交換が行われる。交換された使用後の工具に対しては、工具折損検知装置の接触子が刃先高さに対応して移動することにより、接触の有無に従い検知信号が折損判定装置に送信され、工具の折損が判定される。 According to the above configuration, the tool indexing device moves the tool along the path of the oval, and the indexing tool further moves to the replacement position by the replacement tool displacement device, thereby exchanging the tool with the partner device. Is done. For the used tool that has been replaced, the contact of the tool breakage detection device moves according to the height of the cutting edge, and a detection signal is sent to the breakage determination device according to the presence or absence of contact, and the tool breakage is detected. To be judged.
マシニングセンタを示した内部構造の斜視図である。It is a perspective view of the internal structure which showed the machining center. 工具交換状態の自動工具交換機を示した斜視図である。It is the perspective view which showed the automatic tool changer of a tool exchange state. 工具折損検知装置を含む自動工具交換機を後方側から示した斜視図である。It is the perspective view which showed the automatic tool changer containing the tool breakage detection device from the back side. 工具折損検知装置の後部を示した平面図である。It is a top view showing the rear part of a tool breakage detection device. 工具折損検知装置を示した側面図である。It is the side view which showed the tool breakage detection apparatus. 工具割出し装置における工具の移動進路を簡略的に示した平面図である。It is a top view which showed simply the moving course of the tool in a tool indexing device.
　次に、本発明に係る自動工具交換機の一実施形態について、図面を参照しながら以下に説明する。本実施形態では、マシニングセンタに組み込まれた自動工具交換機を例に挙げて説明する。図１は、マシニングセンタを示した内部構造の斜視図である。このマシニングセンタ１は、全体が機体カバーによって覆われ、その内部にワークの切削加工などを実行する加工室が構成されている。特に、このマシニングセンタ１は、ベース３の上を前後方向に移動可能にしたものであり、車輪を備える可動ベッド１１上に組み付けられている。 Next, an embodiment of an automatic tool changer according to the present invention will be described below with reference to the drawings. In this embodiment, an automatic tool changer incorporated in a machining center will be described as an example. FIG. 1 is a perspective view of an internal structure showing a machining center. The machining center 1 is entirely covered with a machine body cover, and a machining chamber for performing cutting work of a work is formed inside the machine center cover. In particular, this machining center 1 is movable on the base 3 in the front-rear direction, and is assembled on a movable bed 11 having wheels.
　マシニングセンタ１は、ワークに対して加工を行う工具を保持する主軸ヘッド１２が前部に設けられている。主軸ヘッド１２は、ドリルやリーマ、ボーリング等の工具の着脱が可能な主軸チャック１３を有し、その主軸チャック１３に保持された工具を回転させる主軸用モータ１４が設けられている。そして、主軸ヘッド１２の下方には、加工対象となるワークを回転可能に把持するチャック装置１５が組み付けられている。 The machining center 1 is provided with a spindle head 12 that holds a tool for machining a work piece in the front part. The spindle head 12 has a spindle chuck 13 on which tools such as a drill, a reamer, and boring can be attached and detached, and a spindle motor 14 for rotating the tool held by the spindle chuck 13 is provided. A chuck device 15 that rotatably grips a work to be processed is assembled below the spindle head 12.
　主軸ヘッド１２は、主軸チャック１３に装着した工具をワークに対して３軸方向に移動させるための加工駆動装置に組み込まれている。具体的には、Ｙ軸スライド２１が機体前後方向に移動自在に搭載され、そのＹ軸スライド２１に対してＸ軸スライド２２が機体幅方向に移動自在に搭載されている。更に、Ｘ軸スライド２２に対してＺ軸スライド２３が上下方向に移動自在に搭載され、そのＺ軸スライド２３に主軸ヘッド１２が搭載されている。 The spindle head 12 is incorporated in a machining drive device for moving a tool mounted on the spindle chuck 13 in three axial directions with respect to a workpiece. Specifically, the Y-axis slide 21 is mounted movably in the machine longitudinal direction, and the X-axis slide 22 is mounted movably in the machine width direction with respect to the Y-axis slide 21. Further, a Z-axis slide 23 is mounted on the X-axis slide 22 so as to be vertically movable, and the spindle head 12 is mounted on the Z-axis slide 23.
　マシニングセンタ１には、こうした加工駆動装置を搭載するようにしてツールマガジン１８が設けられている。ツールマガジン１８は、高さ方向に見てチャック装置１５と主軸ヘッド１２との間に複数の工具を収納したものであり、そのマガジン本体２４内に自動工具交換機１０（図２参照）が組み込まれている。そして、マシニングセンタ１には、主軸ヘッド１２やチャック装置１５あるいはＸ，Ｙ，Ｚ軸の駆動機構、さらに自動工具交換機１０などの駆動を制御するための制御装置１９が搭載されている。 The machining center 1 is provided with a tool magazine 18 so as to mount such a processing drive device. The tool magazine 18 stores a plurality of tools between the chuck device 15 and the spindle head 12 when viewed in the height direction, and the automatic tool changer 10 (see FIG. 2) is incorporated in the magazine body 24. ing. The machining center 1 is equipped with a spindle head 12, a chuck device 15, an X, Y and Z axis drive mechanism, and a control device 19 for controlling the drive of the automatic tool changer 10.
　次に、図２は、工具を交換する状態の自動工具交換機を示した斜視図である。自動工具交換機１０は、マガジン本体２４内に組み込まれ、通常時には図１に示すように開閉扉２５が閉じられ、ワークの加工によって飛び散るクーラントや切削屑などが遮られるようになっている。そして、工具交換時には図２に示すように開閉扉２５が開き、それに合わせて自動工具交換機１０の一部が外にまで移動するよう構成されている。なお、自動工具交換機１０には様々な種類の工具Ｔが装着されるが、図２には具体的な形状を省略して全て円筒形状で表現されている（他の図も同様である）。 Next, FIG. 2 is a perspective view showing the automatic tool changer in a state of exchanging tools. The automatic tool changer 10 is incorporated in a magazine main body 24, and normally, an opening / closing door 25 is closed as shown in FIG. 1 so that coolant and cutting dust scattered by machining a work can be shielded. When the tool is changed, the opening / closing door 25 is opened as shown in FIG. 2, and a part of the automatic tool changer 10 is moved to the outside in accordance with the opening / closing door 25. Although various types of tools T are mounted on the automatic tool changer 10, a concrete shape is omitted in FIG. 2 and all are represented by a cylindrical shape (the same applies to other drawings).
　自動工具交換機１０には、ツールホルダ３１によって工具Ｔを着脱可能に保持し、所定位置へと移動させる工具割出し装置１０Ａが構成されている。ツールホルダ３１は、一対の把持爪によって工具Ｔの首部を挟み込むようにしたものであり、工具割出し装置１０Ａでは、複数のツールホルダ３１が無端のローラチェーン３３に一定の間隔で取り付けられている。ローラチェーン３３は、距離を離した２個のスプロケット３２によって長円形になるように掛け渡され、不図示の駆動モータによって回転が制御されるようになっている。工具割出し装置１０Ａは、この回転するローラチェーン３３によって複数の工具Ｔが周方向に移動し、使用対象である工具Ｔｘや空のツールホルダ３１について割出しが可能となっている。 The automatic tool changer 10 is configured with a tool indexing device 10A that detachably holds a tool T by a tool holder 31 and moves the tool T to a predetermined position. The tool holder 31 is configured such that the neck portion of the tool T is sandwiched by a pair of gripping claws. In the tool indexing device 10A, a plurality of tool holders 31 are attached to an endless roller chain 33 at regular intervals. . The roller chain 33 is spanned by two sprockets 32 separated from each other in an elliptical shape, and its rotation is controlled by a drive motor (not shown). In the tool indexing device 10A, a plurality of tools T are moved in the circumferential direction by the rotating roller chain 33, and the tool Tx to be used and the empty tool holder 31 can be indexed.
　次に、自動工具交換機１０は、工具割出し装置１０Ａが長円形の可動テーブル３５上に組み付けられ、交換工具変位装置１０Ｂによって機体前後方向の往復移動が可能な構成となっている。具体的には、工具割出し装置１０Ａによって割出しされた工具Ｔｘや空のツールホルダ３１が、マガジン本体２４の外にある主軸チャック１３との工具交換位置１０１に移動するよう構成されている。 Next, in the automatic tool changer 10, the tool indexing device 10A is assembled on the oval movable table 35, and the tool changing device 10B enables the reciprocating movement in the machine longitudinal direction. Specifically, the tool Tx indexed by the tool indexing device 10A and the empty tool holder 31 are configured to move to the tool exchange position 101 with the spindle chuck 13 outside the magazine body 24.
　その交換工具変位装置１０Ｂは、マガジン本体２４の内部底面にガイドレール３６が敷設され、可動テーブル３５のガイドブロック３７がガイドレール３６に対して摺動可能に嵌め合わされている。可動テーブル３５の下側にはボールネジを構成するナットが固定され、そのナットに駆動モータ３８の回転軸に連結されたネジ軸３９が螺合している。駆動モータ３８はマガジン本体２４側に固定されている。そのため、駆動モータ３８からの出力によってネジ軸３９が回転し、工具割出し装置１０Ａが長円形の長手方向、すなわち機体前後方向に前進及び後退するようになっている。なお、本実施形態では、自動工具交換機１０について開閉扉２５側を前、駆動モータ３８側を後として説明する。 In the exchange tool displacement device 10B, a guide rail 36 is laid on the inner bottom surface of the magazine body 24, and a guide block 37 of the movable table 35 is slidably fitted to the guide rail 36. A nut constituting a ball screw is fixed to the lower side of the movable table 35, and a screw shaft 39 connected to the rotation shaft of the drive motor 38 is screwed into the nut. The drive motor 38 is fixed to the magazine body 24 side. Therefore, the screw shaft 39 is rotated by the output from the drive motor 38, and the tool indexing device 10A is moved forward and backward in the longitudinal direction of the oval, that is, in the machine longitudinal direction. In this embodiment, the automatic tool changer 10 will be described with the opening / closing door 25 side as the front and the drive motor 38 side as the rear.
　自動工具交換機１０には、刃こぼれなど工具の折損状況を確認するための工具折損検知装置１０Ｃが設けられている。図３乃至図５は、工具折損検知装置１０Ｃを示した図である。特に、図３は、工具折損検知装置１０Ｃを含む自動工具交換機１０を後方側から示した斜視図である。また、図４は、自動工具交換機１０の後部を示した平面図であり、図５は、工具折損検知装置１０Ｃを示した側面図である。 The automatic tool changer 10 is provided with a tool breakage detection device 10C for checking a tool breakage status such as a blade spill. 3 to 5 are diagrams showing the tool breakage detection device 10C. In particular, FIG. 3 is a perspective view showing the automatic tool changer 10 including the tool breakage detection device 10C from the rear side. 4 is a plan view showing the rear part of the automatic tool changer 10, and FIG. 5 is a side view showing the tool breakage detection device 10C.
　工具折損検知装置１０Ｃにはタッチセンサ４１が使用され、工具割出し装置１０Ａによって円周上を移動する工具Ｔのうち、工具検知位置２０１（図６参照）に位置決めされた工具Ｔｄについて行われる。ここで、図６は、工具割出し装置１０Ａにおける工具Ｔの移動進路を簡略的に示した平面図である。工具検知位置２０１は、図示するように長円形をした工具進路２００上にあって、前後方向に見た場合に、工具Ｔの移動方向が反転する長手方向端部の後方反転位置２０３の手前にある。一方、後方反転位置２０３とは反対の前方反転位置が工具Ｔｘの割出し位置２０５である。 The touch sensor 41 is used in the tool breakage detection device 10C, and the tool Td is positioned at the tool detection position 201 (see FIG. 6) among the tools T that move on the circumference by the tool indexing device 10A. Here, FIG. 6 is a plan view schematically showing the movement path of the tool T in the tool indexing device 10A. The tool detection position 201 is on the tool path 200 having an oval shape as shown in the drawing, and is located in front of the backward reversal position 203 at the longitudinal end where the moving direction of the tool T is reversed when viewed in the front-rear direction. is there. On the other hand, the front reversal position opposite to the rear reversal position 203 is the indexing position 205 of the tool Tx.
　ところで、従来のツールマガジンには、後方反転位置２０３の工具Ｔに対して投光器５０１と受光器５０２が設けられていた。そして、後方反転位置を通過する工具Ｔの刃先が光５１０を遮断するか否かによって折損検知が行われていた。しかし、こうして光センサを使用する工具折損検知装置は、前記課題でも述べたように誤検知や調整の難しさがあった。そこで、本実施形態の工具折損検知装置１０Ｃでは、工具検知位置２０１に配置したタッチセンサ４１を上下方向に移動させ、様々な検知対象となる具Ｔｄの刃先高さに合わせることが可能な構成が採られている。 By the way, in the conventional tool magazine, the light emitter 501 and the light receiver 502 are provided for the tool T in the backward reversal position 203. Then, the breakage detection is performed depending on whether or not the cutting edge of the tool T passing through the backward reversal position blocks the light 510. However, the tool breakage detection device that uses the optical sensor in this manner has difficulty in erroneous detection and adjustment as described in the above problem. Therefore, in the tool breakage detection device 10C of the present embodiment, there is a configuration in which the touch sensor 41 arranged at the tool detection position 201 can be moved in the vertical direction to match the cutting edge height of the tool Td that is various detection targets. Has been taken.
　工具折損検知装置１０Ｃは、鉛直方向に移動可能なスライド４２を有し、そこから前方に向けて水平にアーム４３が延び、その先端部にタッチセンサ４１が取り付けられている。マガジン本体２４にはブラケット４４を介して検知装置本体４５が固定され、スライド４２は、その側面に形成されたガイド４６に対して摺動可能に取り付けられている。 The tool breakage detection device 10C has a slide 42 that can move in the vertical direction, from which an arm 43 extends horizontally toward the front, and a touch sensor 41 is attached to the tip thereof. A detection device main body 45 is fixed to the magazine main body 24 via a bracket 44, and the slide 42 is slidably attached to a guide 46 formed on the side surface thereof.
　図３及び図４に示すように、自動工具交換機１０の後部には、幅方向中央に交換工具変位装置１０Ｂの駆動モータ３８が設置されている。そのため、駆動モータ３８を避けるように中央からずらした位置に検知装置本体４５が固定され、後方反転位置２０３の手前に工具検知位置２０１が設けられている。なお、図３及び図５において工具検知位置２０１に位置する工具Ｔｄについては、タッチセンサ４１との接触がイメージしやすいように、具体的な形状を省略して棒状に表現されている。 As shown in FIGS. 3 and 4, at the rear of the automatic tool changer 10, a drive motor 38 of the changeable tool displacement device 10B is installed at the center in the width direction. Therefore, the detection device body 45 is fixed at a position displaced from the center so as to avoid the drive motor 38, and the tool detection position 201 is provided in front of the backward reversal position 203. Note that, in FIGS. 3 and 5, the tool Td located at the tool detection position 201 is represented by a rod shape with a specific shape omitted so that the contact with the touch sensor 41 can be easily imagined.
　検知装置本体４５には、その内部にボールネジ機構が設けられている。すなわち、軸受けを介して鉛直方向にネジ軸が組み付けられ、そのネジ軸にはスライド４２に固定されたナット部材が螺合している。よって、ネジ軸が回転することにより、ナット部材と一体のスライド４２が上下方向に移動可能となっている。また、検知装置本体４５の上部にはサーボモータ４７が固定され、その回転軸とネジ軸とに固定されたプーリにベルトが掛けられ、サーボモータ４７の回転制御によってタッチセンサ４１の位置決めが可能になっている。 A ball screw mechanism is provided inside the detection device body 45. That is, the screw shaft is assembled in the vertical direction via the bearing, and the nut member fixed to the slide 42 is screwed onto the screw shaft. Therefore, when the screw shaft rotates, the slide 42 integrated with the nut member can move vertically. Further, a servo motor 47 is fixed to the upper part of the detection device main body 45, and a belt is hung on a pulley fixed to a rotation shaft and a screw shaft of the detection device main body 45. The rotation control of the servo motor 47 enables positioning of the touch sensor 41. Has become.
　タッチセンサ４１は、ドリルなど工具Ｔｄの刃先に接触することにより、内部のｂ接点であるスイッチが切れてＯＦＦ信号がマシニングセンタ１の制御装置１９へと送られるようになっている。制御装置１９のメモリには、折損検知を実行する自動工具交換機１０の駆動制御とともに、タッチセンサ４１から送信される検知信号に基づいて折損の有無を判定するための折損判定プログラムが格納されている。本実施形態では、タッチセンサ４１からＯＦＦ信号が送信された場合に、工具Ｔの刃先に折損が生じているとの判定が行われるようになっている。なお、タッチセンサ４１のスイッチにはａ接点を使用するようにしてもよい。 The touch sensor 41 is configured such that when it comes into contact with the cutting edge of the tool Td such as a drill, the switch serving as the internal b contact is cut off and an OFF signal is sent to the control device 19 of the machining center 1. The memory of the control device 19 stores the drive control of the automatic tool changer 10 that performs the breakage detection, and the breakage determination program for determining the presence or absence of the breakage based on the detection signal transmitted from the touch sensor 41. . In this embodiment, when the OFF signal is transmitted from the touch sensor 41, it is determined that the cutting edge of the tool T is broken. The switch of the touch sensor 41 may use an a contact.
　マシニングセンタ１は、タッチパネル式の操作表示装置が機体前面に取り付けられている。その操作表示装置は、作業情報や操作画面などの表示のほか、作業者によって様々な工具Ｔについての寸法入力などが可能になっている。従って、使用する工具Ｔの寸法値が操作表示装置から入力されることにより刃先の高さが算出され、折損検知の際にはその値に基づいてサーボモータ４７の回転制御が行われるようになっている。また、複数あるツールホルダ３１についてホルダ番号が付され、その番号と装着した工具Ｔの寸法値との関係とが管理される。そのため、寸法が異なる工具Ｔであっても、工具検知位置２０１の工具Ｔｄがホルダ番号によって求められ、タッチセンサ４１の高さを工具Ｔ毎に調整する制御が可能になっている。 The machining center 1 has a touch-panel operation display device attached to the front of the machine. The operation display device is capable of displaying work information, operation screens, and the like, as well as allowing a worker to input dimensions of various tools T. Therefore, the height of the cutting edge is calculated by inputting the dimension value of the tool T to be used from the operation display device, and the rotation control of the servo motor 47 is performed based on the value when the breakage is detected. ing. Further, a holder number is assigned to each of the plurality of tool holders 31, and the relationship between the number and the dimension value of the attached tool T is managed. Therefore, even for the tools T having different sizes, the tool Td at the tool detection position 201 is obtained by the holder number, and the control for adjusting the height of the touch sensor 41 for each tool T is possible.
　続いて、自動工具交換機１０の作用について説明する。まず、マシニングセンタ１では、主軸ヘッド１２に装着された工具Ｔに回転が与えられ、加工駆動装置に対する３軸方向の駆動制御により、チャック装置１５に把持されたワークに対して加工が行われる。そして、ワークＷに対する加工内容の変更に応じ、主軸ヘッド１２における工具Ｔの交換が行われる。工具Ｔの交換は、ローラチェーン３４に回転が与えられ、工具Ｔを保持していない空のホルダ３１が割出し位置２０５へと送られた後、開閉扉２５が開いて可動テーブル３５が図２に示す位置まで移動する。 Next, the operation of the automatic tool changer 10 will be described. First, in the machining center 1, the tool T mounted on the spindle head 12 is rotated, and the workpiece gripped by the chuck device 15 is machined by drive control of the machining drive device in three axial directions. Then, the tool T in the spindle head 12 is exchanged according to the change in the machining content of the work W. To replace the tool T, the roller chain 34 is rotated and the empty holder 31 not holding the tool T is sent to the indexing position 205, and then the opening / closing door 25 is opened and the movable table 35 is moved to the position shown in FIG. Move to the position shown in.
　空のツールホルダ３１は、工具交換位置１０１へと配置され、そこで主軸ヘッド１２から使用後の工具Ｔが受け渡される。その後、ローラチェーン３４に回転が与えられ、交換対象となる工具Ｔｘが割出し位置２０５つまり工具交換位置１０１へと送られ、主軸ヘッド１２に受け渡しされる。こうして工具交換が行われると、可動テーブル３５がマガジン本体２４内に戻されて開閉扉２５が閉じられる。そして、使用済みの工具Ｔが検知対象の工具Ｔｄとして、ローラチェーン３４の回転により工具検知位置２０１へと送られ、工具折損検知装置１０Ｃによる折損検知が行われる。 The empty tool holder 31 is placed at the tool exchange position 101, where the used tool T is delivered from the spindle head 12. After that, the roller chain 34 is rotated, the tool Tx to be replaced is sent to the indexing position 205, that is, the tool replacement position 101, and is delivered to the spindle head 12. When the tool is changed in this way, the movable table 35 is returned into the magazine body 24, and the opening / closing door 25 is closed. Then, the used tool T is sent as the detection target tool Td to the tool detection position 201 by the rotation of the roller chain 34, and the tool breakage detection device 10C detects the breakage.
　工具折損検知装置１０Ｃでは、サーボモータ４７の回転がボールネジ機構を介してスライド４２の移動に変換され、タッチセンサ４１の高さが調整される。具体的には、下降位置で待機するタッチセンサ４１が、サーボモータ４７の駆動により予め設定されている工具Ｔｄの刃先高さにまで上昇する。その際、タッチセンサ４１が工具Ｔｄの刃先に接触した場合には、正常を示す検知信号が制御装置１９へと送られ、工具Ｔｄについて異常が無いと判定される。一方で、工具Ｔｄに刃こぼれが生じているような場合には、タッチセンサ４１が刃先に接しないため、異常を示す検知信号が制御装置１９へと送られ、工具Ｔｄが異常であると判定される。 In the tool breakage detection device 10C, the rotation of the servo motor 47 is converted into the movement of the slide 42 via the ball screw mechanism, and the height of the touch sensor 41 is adjusted. Specifically, the touch sensor 41 standing by at the lowered position moves up to the preset cutting edge height of the tool Td by driving the servo motor 47. At that time, when the touch sensor 41 comes into contact with the cutting edge of the tool Td, a detection signal indicating normality is sent to the control device 19, and it is determined that there is no abnormality in the tool Td. On the other hand, when the tool Td has a blade spill, the touch sensor 41 does not contact the blade tip, so that a detection signal indicating an abnormality is sent to the control device 19 and the tool Td is determined to be abnormal. To be done.
　よって、本実施形態によれば、タッチセンサ４１が工具Ｔｄの刃先に接する機械的な検知が行われるため、光センサのような誤検知を生じることが無い。誤検知が生じた場合、特に刃先が正常であるにもかかわらず折損と判定されると、ワークに対する加工エラーが生じており、また工具交換を行うため、マシニングセンタ１を一旦停止させる必要が生じ、サイクルタイムが大幅にのびてしまう。この点、本実施形態では、タッチセンサ４２の接触の有無によって刃先の状況を判定するため、誤検知が無くなり、マシニングセンタ１の不要な駆動停止を生じさせることがなくなる。 Therefore, according to this embodiment, since the touch sensor 41 mechanically detects that the blade edge of the tool Td is in contact, erroneous detection like an optical sensor does not occur. If erroneous detection occurs, especially if the cutting edge is determined to be broken even though the cutting edge is normal, a machining error has occurred on the workpiece, and it is necessary to temporarily stop the machining center 1 for tool replacement. The cycle time is greatly extended. In this respect, in the present embodiment, since the condition of the cutting edge is determined by the presence / absence of contact of the touch sensor 42, erroneous detection is eliminated, and unnecessary driving stop of the machining center 1 does not occur.
　また、工具折損検知装置１０Ｃは、タッチセンサ４１を昇降させて折損検知を行うため、異なる寸法の工具Ｔｄであっても対応することができ、光センサのように煩わしい調整作業を行う必要がない。また、作業者が操作表示装置によって、自動工具交換機１０に装着する工具Ｔの寸法値を設定入力することにより、刃先の高さに応じたサーボモータ４７の回転制御が行われるため、複数の異なる工具Ｔの取り扱いや工具の取り換えなどに容易に対応することができる。 Further, since the tool breakage detection device 10C detects the breakage by moving the touch sensor 41 up and down, it is possible to deal with tools Td having different sizes, and it is not necessary to perform troublesome adjustment work unlike the optical sensor. . Further, since the operator sets and inputs the dimension value of the tool T to be mounted on the automatic tool changer 10 by the operation display device, the rotation control of the servo motor 47 according to the height of the cutting edge is performed, so that a plurality of different values are obtained. It is possible to easily deal with the handling of the tool T, the replacement of the tool, and the like.
　更に、本実施形態の自動工具交換機１０は、マガジン本体２４内に組み込まれ、工具割出し装置１０Ａによって割出しされた工具Ｔｘなどが、交換工具変位装置１０Ｂによって移動する全体がコンパクトな構成となっている。特に、工具折損検知装置１０Ｃが、交換工具変位装置１０Ｂと同様に自動工具交換機１０の後方側に設けられているため、切削加工などを実行するマシニングセンタ１の加工室に影響はない。この点、加工室を小さくすることができ、ひいてはマシニングセンタ１の小型化にもつながる。 Furthermore, the automatic tool changer 10 of the present embodiment is built in the magazine body 24, and the tool Tx indexed by the tool indexing device 10A and the like are moved by the replacement tool displacing device 10B, so that the entire structure is compact. ing. In particular, since the tool breakage detection device 10C is provided on the rear side of the automatic tool changer 10 like the replacement tool displacement device 10B, there is no effect on the machining chamber of the machining center 1 that executes cutting work or the like. In this respect, the processing chamber can be downsized, which leads to downsizing of the machining center 1.
　以上、本発明の一実施形態について説明したが、本発明はこれらに限定されるものではなく、その趣旨を逸脱しない範囲で様々な変更が可能である。
　前記実施形態では、工具Ｔを割出しする工具割出し装置１０Ａを交換工具変位装置１０Ｂが移動させることにより、加工対象となる工具Ｔｘを工具交換位置１０１へ配置させる構成の自動工具交換装置１０を示したが、これとは異なる構造の自動工具交換装置であっても対応可能である。例えば、工具割出し装置が複数のツールホルダを保持し、交換工具変位装置が、工具交換アームによって工具割出し装置から取りだした工具を工具交換位置へと配置させる構成であってもよい。 Although one embodiment of the present invention has been described above, the present invention is not limited to these, and various modifications can be made without departing from the spirit of the present invention.
In the above-described embodiment, the automatic tool changing device 10 configured to arrange the tool Tx to be processed at the tool changing position 101 by moving the tool indexing device 10A for indexing the tool T by the replacement tool displacement device 10B. Although shown, an automatic tool changer having a different structure can be used. For example, the tool indexing device may hold a plurality of tool holders, and the exchange tool displacement device may arrange the tool extracted from the tool indexing device by the tool exchange arm to the tool exchange position.
１…マシニングセンタ　１０…自動工具交換機　１０Ａ…工具割出し装置　１０Ｂ…交換工具変位装置　１０Ｃ…工具折損検知装置　１２…主軸ヘッド　１５…チャック装置　１８…ツールマガジン　１９…制御装置　３１…ツールホルダ　３３…ローラチェーン　４１…タッチセンサ　４２…スライド　４５…検知装置本体　４６…ガイド　４７…サーボモータ　１０１…工具交換位置　２０１…工具検知位置　２０５…割出し位置 1 ... Machining center 10 ... Automatic tool changer 10A ... Tool indexing device 10B ... Exchanged tool displacement device 10C ... Tool breakage detection device 12 ... Spindle head 15 ... Chuck device 18 ... Tool magazine 19 ... Control device 31 ... Tool holder 33 ... Roller chain 41 ... Touch sensor 42 ... Slide 45 ... Detection device body 46 ... Guide 47 ... Servo motor 101 ... Tool replacement position 201 ... Tool detection position 205 ... Indexing position

Claims (4)

  1. 　起立した姿勢で保持部材によって保持した複数の工具を、長円形の進路に従って移動させ、所定の工具を進路上の割出し位置に停止させる工具割出し装置と、
    　前記割出し位置の工具を相手装置との交換位置に移動させる交換工具変位装置と、
    　前記工具割出し装置における工具の進路上にある工具の刃先高さに対応させ、昇降機構によって接触子を移動させる工具折損検知装置と、
    　工具の刃先に対する前記接触子の接触の有無に従い前記工具折損検知装置から送信される検知信号に基づいて工具の折損を判定する折損判定装置と、
    を有する自動工具交換機。     A tool indexing device that moves a plurality of tools held by a holding member in an upright posture according to an oval path, and stops a predetermined tool at an indexing position on the path,
    A replacement tool displacement device for moving the tool at the indexing position to a replacement position with a counterpart device,
    A tool breakage detection device that corresponds to the height of the cutting edge of the tool on the path of the tool in the tool indexing device and moves the contactor by an elevating mechanism,
    A breakage determination device that determines the breakage of the tool based on the detection signal transmitted from the tool breakage detection device according to the presence or absence of the contact of the contact to the blade edge of the tool,
    Automatic tool changer with.
  2. 　前記工具割出し装置は、工具の移動方向が反転する長円形の長手方向端部に割出し位置があり、前記工具折損検知装置は、前記割出し位置とは反対の長手方向端部側において前記接触子が工具の刃先に接触するように組み付けられた請求項１に記載の自動工具交換機。 The tool indexing device has an indexing position at the longitudinal end portion of the oval in which the moving direction of the tool is reversed, and the tool breakage detection device is at the longitudinal end portion side opposite to the indexing position. The automatic tool changer according to claim 1, wherein the contactor is assembled so as to contact the cutting edge of the tool.
  3. 　前記交換工具変位装置は、箱形の交換機本体内に組み込まれた前記工具割出し装置を移動させ、割出し位置の工具を前記収納部から出し入れするものである請求項１または請求項２に記載の自動工具交換機。 The said exchange tool displacement apparatus moves the said tool indexing device incorporated in the box-shaped exchange machine main body, and takes in / outs the tool of the index position from the said accommodating part. Automatic tool changer.
  4. 　前記工具折損検知装置は、工具の移動方向が反転する長円形の長手方向端部の手前において、前記接触子が工具の刃先に接触するように組み付けられた請求項３に記載の自動工具交換機。
          The automatic tool changer according to claim 3, wherein the tool breakage detection device is assembled so that the contactor comes into contact with the blade edge of the tool before the end of the elliptical longitudinal direction in which the moving direction of the tool is reversed.
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