WO2000062010A1 - Position sensor and contact needle - Google Patents

Position sensor and contact needle Download PDF

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Publication number
WO2000062010A1
WO2000062010A1 PCT/JP2000/002220 JP0002220W WO0062010A1 WO 2000062010 A1 WO2000062010 A1 WO 2000062010A1 JP 0002220 W JP0002220 W JP 0002220W WO 0062010 A1 WO0062010 A1 WO 0062010A1
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WO
WIPO (PCT)
Prior art keywords
contact
position detector
contact body
tool
sphere
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Application number
PCT/JP2000/002220
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French (fr)
Japanese (ja)
Inventor
Norio Fukuhisa
Original Assignee
Nisshin Sangyo Co., Ltd.
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Application filed by Nisshin Sangyo Co., Ltd. filed Critical Nisshin Sangyo Co., Ltd.
Publication of WO2000062010A1 publication Critical patent/WO2000062010A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/004—Measuring arrangements characterised by the use of mechanical techniques for measuring coordinates of points
    • G01B5/008—Measuring arrangements characterised by the use of mechanical techniques for measuring coordinates of points using coordinate measuring machines
    • G01B5/012—Contact-making feeler heads therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B1/00—Measuring instruments characterised by the selection of material therefor

Definitions

  • the present invention relates to a position detector for detecting a relative position between a tool or a tool holder of a machine tool and a work by contact, and a contact needle thereof.
  • the position detector which detects the relative positional relationship between the work and the tool attached to the machine tool by contact, has a contact end that can move in the evacuation direction at the time of contact and is biased and held at a predetermined stable position. I have.
  • this type of position detector there are a type in which the main body is attached to a tool holder of a machine tool, and a type in which the main body is attached to a workpiece by a magnet or the like.
  • FIG. 2 The former example is shown in FIG. 2, in which a battery 3 is housed in a plastic case 2 housed in a body 1, an anode of an LED 4 is connected to the anode of the battery 3, and a power sword is connected to the body 1.
  • the contact needle 5 is attached to the main body 1 while the disc-shaped base 6 is electrically insulated via an insulator 7 and pressed against the support leg 9 by a panel 8. I have.
  • the support leg 9 is screwed into the main body 1 and finely adjusts the position of the contact needle 5 by screwing it back and forth.
  • the base 6 of the contact needle is connected to the cathode of the battery 3 by the lead wire 11.
  • FIG. 4 An example of the latter is shown in FIG. 4, in which an upper part of the main body 1 is provided with a contact plate 5 which is movable in a downward direction in an electrically insulated state and is projected upward by a panel 8 to be urged by a panel 8. I have.
  • the contact end at the upper end of the contact plate 5 is a plane parallel to the bottom surface 14 of the main body 1, and the contact plate 5 and the main body 1 are connected by a conducting wire 11 in which the LED 4 and the battery 3 are connected in series.
  • the position detector configured as described above, after the main body 1 is attached to the workpiece 13 and the tool 15 is moved to contact the contact plate 5, the electric circuit passing through the machine tool is closed and the LED is closed. 4 lights up, and the position of the work is detected.
  • the contact body of this type of position detector is required to be an electric conductor, be inexpensive, and have the required hardness and wear resistance. Pairing steels with good properties and excellent mechanical properties by quenching and tempering are often used.
  • the circuit When the position of the work is detected by such a conventional position detector, the circuit is opened and closed, and the contact body repeatedly switches between an energized state and a non-energized state, and the contact body is sequentially magnetized. For this reason, chips generated by cutting or the like adhere to the contact body and intervene between the contact body and the workpiece or tool during position detection, causing a measurement error.
  • the contact body is an elongated contact needle, the contact needle is pulled by the magnetic force when the contact needle is approached from the side of the work, and the contact needle is slightly bent, causing a measurement error.
  • the contact body is made of a non-magnetic metal material such as austenitic stainless steel or duralumin, the above problem can be solved.However, the non-magnetic metal material has a low hardness and wear and tear due to repeated contact and separation with the workpiece and tool. A measurement error occurs due to deformation. Disclosure of the invention
  • the present invention enables accurate position detection by obtaining a non-magnetic contact body that is durable and does not cause measurement errors.
  • the contact end of the contact body 5 is formed of a nonmagnetic material in which approximately 6 to 16% of nickel is mixed as a binder into one byte of tungsten.
  • the contact body 5 is attached to the position detector main body while being evacuated and biased to a predetermined stable position in an electrically insulated state.
  • the contact body 5 is connected to the contact detection circuits 3 and 4, and the contact body 5 and the main body 1 are electrically connected via the tool 15 of the machine tool or the tool holder 12 and the work 13 At this time, the contact detection circuits 3 and 4 are opened and closed, and the relative positional relationship between the workpiece and the tool or tool holder is detected.
  • the handle 17 is a general
  • the sphere 16 is made of a non-magnetic material in which nickel is mixed as a binder with tungsten carbide.
  • the above sphere 16 is mixed with 4 to 16%, optimally around 6% of nickel in a fine powder of tungsten force and sintered at a high temperature, molded into a molten state, and then rolled. It is obtained by polishing while polishing.
  • the non-magnetic material for forming the handle include austenitic stainless steel, duralumin, and beryllium copper. The material obtained by age hardening of perilith copper has high mechanical strength and is not easily deformed.
  • the contact needle of the position detector of the present invention is a ball made of a non-magnetic material obtained by mixing nickel as a binder into a byte of tungsten and sintering, and an age hardened beryllium copper.
  • the spherical body 16 is formed into a perfect circle by joining an austenitic stainless steel male screw 18 by welding or bonding and screwing it into the screw hole provided at the tip of the handlebar 17 to fix it.
  • the structure is interchangeable and can be supplied individually.
  • the contact end of the contact body is made of a non-magnetic material obtained by mixing nickel as a binder into the tungsten carbide and sintering the contact body, so that the contact end can be given high hardness, and the contact end can be worn. And a decrease in position detection accuracy due to deformation or deformation.
  • FIG. 1 is a perspective view of a first embodiment of a contact body (contact needle) of the present invention.
  • FIG. 2 is a side view showing the position detector of the first embodiment and a measuring method thereof.
  • FIG. 3 is a perspective view of a second embodiment of the contact body of the present invention.
  • FIG. 4 is a side view showing the position detector of the second embodiment and a measuring method thereof.
  • reference numeral 1 is the body of the position detector, 3 is the battery, 4 is the LED, 5 is the contact body, 1 is the tool holder, 1 is the work holder, 13 is the work, 15 is the tool, 16 is the sphere, and 17 is Handle rod, 18 is a male screw.
  • FIG. 1 and 2 are views showing a first embodiment of the present invention.
  • the overall structure of the position detector shown in Fig. 2 has been described above.
  • the contact body (contact needle) 5 shown in FIG. 1 is formed by a sphere 16 and a handle 17.
  • Handle rod 17 is made of perilith copper It is manufactured by age hardening at a temperature of about 350 ° C after the cutting process.
  • Sphere 16 is prepared by adding 6% nickel to fine powder of tungsten carpite, melting nickel at a high temperature, mixing it with a stainless steel bite, and sintering the spherical surface in a mold to grind the peripheral surface. It is manufactured by making a male thread 18 of SUS304 electric resistance welded at one place on the circumference.
  • SUS304 is basically non-magnetic, but is magnetized during processing, and is returned to non-magnetic by solution heat treatment after mechanical processing. In this way, the entire handle rod 17 can be manufactured by using non-magnetic SUS 304 or the like.
  • the male screw 18 can be bonded to the handle 17 with an adhesive such as an epoxy resin adhesive, in addition to electric resistance welding such as spot welding. When bonding, it is preferable because a hole is provided in the peripheral surface of the sphere by electric discharge machining, and the male screw is bonded in a state fitted in the hole.
  • the sphere 16 is fixed to the tip of the handle rod 17 by screwing the male screw 18 into an axial female screw hole provided at the tip of the handle rod 17.
  • the base end of the handlebar 17 has a large diameter, and the axial screw provided at the base end of the disk 6 supported by floating on the main body via the insulator and biasing it to the neutral position is supported.
  • the contact needle 5 is attached to the main body 1 in a state of being electrically insulated by being screwed into the center hole.
  • the position detector of the first embodiment is attached to the tool holder 12 and the tip of the contact needle 5 is brought into contact with the side surface of the work 13 so that the work 13 and the tool holder 12 can move in the horizontal direction. Detect the positional relationship.
  • the detection needle 5 is held at a stable position by pressing the disk 6 against the support leg 9 with the panel 8, and can be retracted to the side after contacting the work.
  • FIGS. 3 and 4 show a second embodiment of the present invention.
  • the contact body 5 of this embodiment is formed by processing austenitic stainless steel into a disk shape with a sliding shaft centered on the lower surface, and using nickel as a bonding material with tungsten carbide on the upper surface of the disk, which is the contact end with the tool. Sinter the mixed non-magnetic material and polish its surface It is manufactured by doing.
  • the position detector of the second embodiment is mounted on the work 13 and the tip of the tool 15 is brought into contact with the upper surface of the contact body 5, so that the positional relationship between the work 13 and the tool 15 in the height direction Is detected.
  • the detector 5 is held in a stable position by pressing against the upper stroke end with the panel 8 and can be retracted downward after contacting the tool.
  • the position detector and the contact body of the present invention can be used to detect the relative positional relationship between a tool and a tool when processing a metal work.
  • the position detector and the contact body of the present invention are used, measurement errors due to the magnetization of the contact body serving as the detection end can be avoided, and the problem of a decrease in the hardness of the contact end does not occur. Therefore, it is possible to prevent the occurrence of measurement errors due to magnetization or wear of the contact end or deformation of the surface, thereby enabling accurate position detection and improving the durability of the detection end.

Abstract

The contact tip of a contact body of a position sensor for sensing a work is made of a nonmagnetic material containing tungsten carbide and about 6 to 16% of nickel as a binder. The contact body is connected to a contact sensing circuit in a state where it is electrically insulated. When the contact body is electrically connected through a tool and tool holder of the machine and through the work, the contact sensing circuit is switched on/off to measure the relative position between the work and the tool and tool holder. If the contact body is a thin contact needle, the rod is made of a nonmagnetic material, or preferably an age-hardened material of beryllium copper. Degradation of the measurement accuracy due to magnetization of the contact body is prevented.

Description

明 細 書 位置検出器及びその接触針 技術分野  Description Position detector and its contact needle
この発明は、 接触により工作機械の工具ないし工具ホルダとワークとの相 対位置を検出する位置検出器及びその接触針に関するものである。 背景技術  The present invention relates to a position detector for detecting a relative position between a tool or a tool holder of a machine tool and a work by contact, and a contact needle thereof. Background art
工作機械に取付けられたワークと工具との相対位置関係を接触により検出 する位置検出器は、 接触時に退避方向に移動可能でかつ所定の安定位置に付 勢して保持された接触端を備えている。 この種の位置検出器は、 その本体が 工作機械の工具ホルダに取り付けられるものと、 本体が磁石等によりワーク に取り付けられるものとがある。  The position detector, which detects the relative positional relationship between the work and the tool attached to the machine tool by contact, has a contact end that can move in the evacuation direction at the time of contact and is biased and held at a predetermined stable position. I have. In this type of position detector, there are a type in which the main body is attached to a tool holder of a machine tool, and a type in which the main body is attached to a workpiece by a magnet or the like.
前者の例は図 2に示されており、 本体 1に収納されたプラスチックケース 2に電池 3が収納され、 L E D 4のアノードが電池 3の陽極に、 力ソードが 本体 1に接続されている。 接触針 5は、 その円板状の基部 6を、 絶縁体 7を 介して電気的に絶縁した状態で、 かつ、 パネ 8により支持脚 9に押接した状 態で、 本体 1に装着されている。 支持脚 9は本体 1に螺合されており、 これ を螺進退させることにより、 接触針 5の位置を微調整する。接触針の基部 6 は電池 3の陰極にリード線 1 1で接続されている。  The former example is shown in FIG. 2, in which a battery 3 is housed in a plastic case 2 housed in a body 1, an anode of an LED 4 is connected to the anode of the battery 3, and a power sword is connected to the body 1. The contact needle 5 is attached to the main body 1 while the disc-shaped base 6 is electrically insulated via an insulator 7 and pressed against the support leg 9 by a panel 8. I have. The support leg 9 is screwed into the main body 1 and finely adjusts the position of the contact needle 5 by screwing it back and forth. The base 6 of the contact needle is connected to the cathode of the battery 3 by the lead wire 11.
このように構成された位置検出器は、 本体 1を工作機械の工具ホルダ 1 2 に取り付けて接触針 5をワーク 1 3に接触させると、 工作機械を通る電気回 路が閉成されて L E D 4が点灯し、 ワーク 1 3の位置が検出される。 後者の例は、 図 4に示されており、 本体 1の上部に電気的に絶縁された状 態で下方に移動自在かつ上方にパネ 8で付勢されて突出する接触板 5が設け られている。接触板 5の上端の接触端は本体 1の底面 1 4と平行な平面で、 この接触板 5と本体 1とは L E D 4と電池 3とを直列接続した導線 1 1で接 続されている。 When the main body 1 is attached to the tool holder 12 of the machine tool and the contact needle 5 is brought into contact with the workpiece 13, the electric circuit passing through the machine tool is closed and the position Lights up, and the position of work 13 is detected. An example of the latter is shown in FIG. 4, in which an upper part of the main body 1 is provided with a contact plate 5 which is movable in a downward direction in an electrically insulated state and is projected upward by a panel 8 to be urged by a panel 8. I have. The contact end at the upper end of the contact plate 5 is a plane parallel to the bottom surface 14 of the main body 1, and the contact plate 5 and the main body 1 are connected by a conducting wire 11 in which the LED 4 and the battery 3 are connected in series.
このように構成された位置検出器は、 その本体 1をワーク 1 3に取り付け たあと、 工具 1 5を移動して接触板 5に接触させると、 工作機械を通る電気 回路が閉成されて L E D 4が点灯し、 ワークの位置が検出される。  With the position detector configured as described above, after the main body 1 is attached to the workpiece 13 and the tool 15 is moved to contact the contact plate 5, the electric circuit passing through the machine tool is closed and the LED is closed. 4 lights up, and the position of the work is detected.
以上のように、 この種の位置検出器の接触体には、 電気導体であること、 安価であること、 必要な硬さと耐摩耗性を備えていること等が要求されるの で、 焼き入れ性が良好で焼き入れ焼き戻しにより優れた機械的性質を発揮す るペアリング鋼が多く用いられている。  As described above, the contact body of this type of position detector is required to be an electric conductor, be inexpensive, and have the required hardness and wear resistance. Pairing steels with good properties and excellent mechanical properties by quenching and tempering are often used.
このような従来の位置検出器でワークの位置を検出する場合、 回路が開閉 されて接触体が通電状態と非通電状態とを繰り返すことになり、 接触体が次 第に磁気を帯びてくる。このため切削加工等で生じた切粉が接触体に付着し、 位置検出時に接触体とワークや工具との間に介在して測定誤差を生ずる。 ま た接触体が細長い接触針であるときは、 接触針をワークの側方から接近させ たとき磁力で接触針が引かれて僅かに屈曲して測定誤差を生ずる。  When the position of the work is detected by such a conventional position detector, the circuit is opened and closed, and the contact body repeatedly switches between an energized state and a non-energized state, and the contact body is sequentially magnetized. For this reason, chips generated by cutting or the like adhere to the contact body and intervene between the contact body and the workpiece or tool during position detection, causing a measurement error. When the contact body is an elongated contact needle, the contact needle is pulled by the magnetic force when the contact needle is approached from the side of the work, and the contact needle is slightly bent, causing a measurement error.
接触体をオーステナイト系ステンレス鋼やジュラルミンなどの非磁性金属 材で製造すれば、 上記問題を解决できるが、 非磁性金属材は硬度が低く、 ヮ ークゃ工具との繰り返し当接離隔により摩耗や変形による測定誤差を生じる。 発明の開示  If the contact body is made of a non-magnetic metal material such as austenitic stainless steel or duralumin, the above problem can be solved.However, the non-magnetic metal material has a low hardness and wear and tear due to repeated contact and separation with the workpiece and tool. A measurement error occurs due to deformation. Disclosure of the invention
この発明は、 耐久性があり、 測定誤差を生じない非磁性の接触体を得るこ とにより、 正確な位置検出を可能にしたものである。 この発明に係る位置検出器は、 その接触体 5の接触端を、 タングステン力 一バイ卜に結合材としてニッケル約 6〜1 6 %を混入した非磁性材で形成し ている。 The present invention enables accurate position detection by obtaining a non-magnetic contact body that is durable and does not cause measurement errors. In the position detector according to the present invention, the contact end of the contact body 5 is formed of a nonmagnetic material in which approximately 6 to 16% of nickel is mixed as a binder into one byte of tungsten.
この接触体 5は、 電気的に絶縁された状態で退避可能かつ所定の安定位置 に付勢して、 位置検出器本体に取り付けられている。 接触体 5は接触検出回 路 3、 4に接続されており、 接触体 5と本体 1とが工作機械の工具 1 5ない し工具ホルダ 1 2及びワーク 1 3を介して電気的に導通されたときに、 接触 検出回路 3、 4が開閉されて、 ワークと工具ないし工具ホルダとの相対位置 関係が検出される。  The contact body 5 is attached to the position detector main body while being evacuated and biased to a predetermined stable position in an electrically insulated state. The contact body 5 is connected to the contact detection circuits 3 and 4, and the contact body 5 and the main body 1 are electrically connected via the tool 15 of the machine tool or the tool holder 12 and the work 13 At this time, the contact detection circuits 3 and 4 are opened and closed, and the relative positional relationship between the workpiece and the tool or tool holder is detected.
接触体 5が接触端となる球体 1 6とこの球体を本体から離れた位置に保持 する細長い柄杆 1 7とを含んで構成された接触針であるときは、 柄杆 1 7を 一般的な非磁性材で製作し、 球体 1 6をタングステンカーバイトに結合材と してニッケルを混入した非磁性材で製作する。  When the contact body 5 is a contact needle comprising a sphere 16 serving as a contact end and an elongated handle 17 holding the sphere away from the main body, the handle 17 is a general The sphere 16 is made of a non-magnetic material in which nickel is mixed as a binder with tungsten carbide.
上記球体 1 6は、 タングステン力一バイ 卜の微粉末に 4〜1 6 %、 最適に は 6 %前後のニッケルを混入して高温で焼結し、 溶融状態のものを成形した あと転動させながら研磨することにより得られる。 柄杆を製作する非磁性材 としてはオーステナイト系ステンレス鋼、 ジュラルミン、 ベリリューム銅な どを例示することができる。 ペリリューム銅を時効硬化処理した材料は、 機 械的強度が高く変形しにくい。  The above sphere 16 is mixed with 4 to 16%, optimally around 6% of nickel in a fine powder of tungsten force and sintered at a high temperature, molded into a molten state, and then rolled. It is obtained by polishing while polishing. Examples of the non-magnetic material for forming the handle include austenitic stainless steel, duralumin, and beryllium copper. The material obtained by age hardening of perilith copper has high mechanical strength and is not easily deformed.
この発明の位置検出器の接触針は、 タングステン力一バイ卜に結合材とし てニッケルを混入して焼結してなる非磁性材で製作された先端の球体 1 6と、 ベリリューム銅を時効硬化処理した非磁性材で製作された細長い柄杆 1 7と を備えている。 球体 1 6は、 真円に成形したものにオーステナイ卜系ステン レス鋼の雄ネジ 1 8を溶接や接着により接合し、 柄杆 1 7の先端に設けたネ ジ孔に螺合して固定する構造とすれば、交換可能であり、個別に供給できる。 接触体 5を非磁性材で形成することにより、 接触検出回路の開閉動作によ つて接触体が磁化するのを防止できる。 そして接触体の接触端をタングステ ンカーバイ ト粉末に結合材としてニッケルを混入して焼結してなる非磁性材 で製作することにより、 接触端に高い硬度を付与することができ、 接触端の 摩耗や変形による位置検出精度の低下を防止できる。 The contact needle of the position detector of the present invention is a ball made of a non-magnetic material obtained by mixing nickel as a binder into a byte of tungsten and sintering, and an age hardened beryllium copper. An elongated handle 17 made of a treated non-magnetic material. The spherical body 16 is formed into a perfect circle by joining an austenitic stainless steel male screw 18 by welding or bonding and screwing it into the screw hole provided at the tip of the handlebar 17 to fix it. The structure is interchangeable and can be supplied individually. By forming the contact body 5 from a non-magnetic material, it is possible to prevent the contact body from being magnetized by the opening / closing operation of the contact detection circuit. The contact end of the contact body is made of a non-magnetic material obtained by mixing nickel as a binder into the tungsten carbide and sintering the contact body, so that the contact end can be given high hardness, and the contact end can be worn. And a decrease in position detection accuracy due to deformation or deformation.
この利点は、 接触体が細長い柄杆を備えた接触針であるときに、 磁力によ る柄杆の傾きが防止されるので、 特に有効に発揮される。 接触針の細長い柄 杆は、 外力による屈曲変形を受けやすいが、 この柄杆の材料としてべリリュ 一ム銅を時効硬化処理した硬い材料を用いることにより、 柄杆の屈曲変形に よる測定精度の低下も防止できる。 また接触端を球体とすることにより、 総 ての方向からの正確な位置検出が可能である。 図面の簡単な説明  This advantage is particularly effective when the contact body is a contact needle having an elongated handle rod, because the inclination of the handle rod due to magnetic force is prevented. The slender handle rod of the contact needle is susceptible to bending deformation due to external force. The drop can also be prevented. By using a spherical contact end, accurate position detection from all directions is possible. BRIEF DESCRIPTION OF THE FIGURES
図 1は、 この発明の接触体 （接触針） の第 1実施例の斜視図である。 図 2 は、第 1実施例の位置検出器及びその測定方法を示す側面図である。図 3は、 この発明の接触体の第 2実施例の斜視図である。 図 4は、 第 2実施例の位置 検出器及びその測定方法を示す側面図である。  FIG. 1 is a perspective view of a first embodiment of a contact body (contact needle) of the present invention. FIG. 2 is a side view showing the position detector of the first embodiment and a measuring method thereof. FIG. 3 is a perspective view of a second embodiment of the contact body of the present invention. FIG. 4 is a side view showing the position detector of the second embodiment and a measuring method thereof.
図において、 符号の 1は位置検出器の本体、 3は電池、 4は L E D、 5は 接触体、 1 2は工具ホルダ、 1 3はワーク、 1 5は工具、 1 6は球体、 1 7 は柄杆、 1 8は雄ネジである。 発明の実施のための最良の形態  In the figure, reference numeral 1 is the body of the position detector, 3 is the battery, 4 is the LED, 5 is the contact body, 1 is the tool holder, 1 is the work holder, 13 is the work, 15 is the tool, 16 is the sphere, and 17 is Handle rod, 18 is a male screw. BEST MODE FOR CARRYING OUT THE INVENTION
図 1及び図 2は本発明の第 1実施例を示した図である。 図 2に示す位置検 出器の全体構造については前述した。 図 1に示す接触体 （接触針） 5は球体 1 6と柄杆 1 7とで形成されている。 柄杆 1 7は、 ペリリューム銅を所定寸 法に切削加工したあと約 3 5 0度の温度で時効硬化処理をして製作されてい る。 球体 1 6は、 タングステンカーパイトの微粉末に 6 %のニッケルを加え て高温下でニッケルを溶融して夕ングステンカ一バイトと混合し、 型内で球 形に焼結したものの周面を研磨して真円とし、 その周面の 1ケ所に S U S 3 0 4の雄ネジ 1 8を電気抵抗溶接して製作されている。 1 and 2 are views showing a first embodiment of the present invention. The overall structure of the position detector shown in Fig. 2 has been described above. The contact body (contact needle) 5 shown in FIG. 1 is formed by a sphere 16 and a handle 17. Handle rod 17 is made of perilith copper It is manufactured by age hardening at a temperature of about 350 ° C after the cutting process. Sphere 16 is prepared by adding 6% nickel to fine powder of tungsten carpite, melting nickel at a high temperature, mixing it with a stainless steel bite, and sintering the spherical surface in a mold to grind the peripheral surface. It is manufactured by making a male thread 18 of SUS304 electric resistance welded at one place on the circumference.
S U S 3 0 4は、 基本的には非磁性であるが、 加工中に磁化するので、 機 械加工後固溶化熱処理して非磁性に戻している。 このようにして非磁性にし た S U S 3 0 4などで柄杆 1 7全体を製作することもできる。雄ネジ 1 8は、 スポット溶接などの電気抵抗溶接の他、 エポキシ樹脂系接着材等の接着剤で 柄杆 1 7に接着することもできる。 接着する際は、 球体の周面に放電加工で 孔を設けて雄ネジをこの孔に嵌合した状態で接着するので好ましい。 球体 1 6は、 雄ネジ 1 8を柄杆 1 7の先端に設けた軸方向の雌ネジ孔に螺合するこ とにより、 柄杆 1 7の先端に固定される。  SUS304 is basically non-magnetic, but is magnetized during processing, and is returned to non-magnetic by solution heat treatment after mechanical processing. In this way, the entire handle rod 17 can be manufactured by using non-magnetic SUS 304 or the like. The male screw 18 can be bonded to the handle 17 with an adhesive such as an epoxy resin adhesive, in addition to electric resistance welding such as spot welding. When bonding, it is preferable because a hole is provided in the peripheral surface of the sphere by electric discharge machining, and the male screw is bonded in a state fitted in the hole. The sphere 16 is fixed to the tip of the handle rod 17 by screwing the male screw 18 into an axial female screw hole provided at the tip of the handle rod 17.
柄杆 1 7の基端は径大となっており、 この基端に設けた軸方向のネジを、 絶縁体を介して本体に遊動かつ中立位置に付勢して支持された円板 6の中心 孔に螺合して、 接触針 5を本体 1に電気的に絶縁した状態で装着している。 この第 1実施例の位置検出器は、 工具ホルダ 1 2に取り付けてその接触針 5の先端をワーク 1 3の側面に接触させることにより、 ワーク 1 3と工具ホ ルダ 1 2との横方向の位置関係を検出する。 検出針 5は、 円板 6をパネ 8で 支持脚 9に押接することにより安定位置に保持されて、 ワークと接触したあ と側方にに退避可能である。  The base end of the handlebar 17 has a large diameter, and the axial screw provided at the base end of the disk 6 supported by floating on the main body via the insulator and biasing it to the neutral position is supported. The contact needle 5 is attached to the main body 1 in a state of being electrically insulated by being screwed into the center hole. The position detector of the first embodiment is attached to the tool holder 12 and the tip of the contact needle 5 is brought into contact with the side surface of the work 13 so that the work 13 and the tool holder 12 can move in the horizontal direction. Detect the positional relationship. The detection needle 5 is held at a stable position by pressing the disk 6 against the support leg 9 with the panel 8, and can be retracted to the side after contacting the work.
図 3及び図 4はこの発明の第 2実施例を示したものである。 この実施例の 接触体 5は、 オーステナイト系ステンレス鋼を下面中心に摺動軸を備えた円 盤状に加工し、 工具との接触端となる円盤の上面にタングステンカーバイト に結合材としてニッケルを混入してなる非磁性材を焼結してその表面を研磨 することにより製作されている。 FIGS. 3 and 4 show a second embodiment of the present invention. The contact body 5 of this embodiment is formed by processing austenitic stainless steel into a disk shape with a sliding shaft centered on the lower surface, and using nickel as a bonding material with tungsten carbide on the upper surface of the disk, which is the contact end with the tool. Sinter the mixed non-magnetic material and polish its surface It is manufactured by doing.
この第 2実施例の位置検出器は、 ワーク 1 3に取り付けてその接触体 5の 上面に工具 1 5の先端を接触させることにより、 ワーク 1 3と工具 1 5との 高さ方向の位置関係を検出する。 検出体 5は、 パネ 8で上方のストローク端 に押接して安定位置に保持されており、 工具と接触したあと下方に退避可能 である。 産業上の利用可能性  The position detector of the second embodiment is mounted on the work 13 and the tip of the tool 15 is brought into contact with the upper surface of the contact body 5, so that the positional relationship between the work 13 and the tool 15 in the height direction Is detected. The detector 5 is held in a stable position by pressing against the upper stroke end with the panel 8 and can be retracted downward after contacting the tool. Industrial applicability
この発明の位置検出器及びその接触体は、 金属ワークの加工に際してヮ一 クと工具の相対位置関係を検出するのに用いることができる。 この発明の位 置検出器及び接触体を用いたときは、 検出端となる接触体の磁化による計測 誤差の発生を避けることができ、 接触端の硬度低下の問題も生じない。 従つ て接触端の磁化や摩耗ないし表面の変形による計測誤差の発生を防止でき、 正確な位置検出が可能になると共に、 検出端の耐久性も向上する。  INDUSTRIAL APPLICABILITY The position detector and the contact body of the present invention can be used to detect the relative positional relationship between a tool and a tool when processing a metal work. When the position detector and the contact body of the present invention are used, measurement errors due to the magnetization of the contact body serving as the detection end can be avoided, and the problem of a decrease in the hardness of the contact end does not occur. Therefore, it is possible to prevent the occurrence of measurement errors due to magnetization or wear of the contact end or deformation of the surface, thereby enabling accurate position detection and improving the durability of the detection end.

Claims

請 求 の 範 囲 The scope of the claims
1 . 電気的に絶縁された状態で所定の安定位置を保持する退避移動可能な 接触体 (5)と、 当該接触体に接続された接触検出回路 (3、4)とを備え、 当該接 触検出回路で接触体 (5)とワーク又は工具ないし工具ホルダとの接触を電気 的に検出する位置検出器において、 接触体 (5 )の接触端がタングステンカー パイトにニッケルを結合材として混入してなる非磁性材で形成されているこ とを特徴とする、 位置検出器。 1. A retractable and movable contact body (5) for maintaining a predetermined stable position in an electrically insulated state, and a contact detection circuit (3, 4) connected to the contact body. In a position detector that electrically detects the contact between the contact body (5) and the workpiece or tool or tool holder with the detection circuit, the contact end of the contact body (5) is mixed with nickel as a binder in tungsten carpite. A position detector characterized by being formed of a non-magnetic material.
2 . 接触体 ( 5)が接触端である先端の球体 ( 16 )と当該球体を本体から離れ た位置に保持する細長い柄杆（17)とを含む接触針であり、 前記柄杆が非磁性 材で製作され、 前記球体がタングステンカーバイ 卜にニッケルを結合材とし て混入してなる非磁性材で製作されていることを特徴とする、 請求の範囲第2. A contact needle comprising a sphere (16) at the tip where the contact body (5) is a contact end and an elongated handle (17) for holding the sphere at a position away from the main body, wherein the handle is non-magnetic. The sphere is made of a non-magnetic material obtained by mixing nickel as a binder into tungsten carbide.
1項記載の位置検出器。 The position detector according to item 1.
3 . 細長い柄杆 ( 17)とその一端に固定された球体 ( 16 )とを備え、 前記球体 がタングステンカーバイトにニッケルを結合材として混入してなる非磁性材 で製作され、 前記柄杆がベリリューム銅を時効硬化処理した非磁性材で製作 されている、 位置検出器の接触針。 3. It has an elongated handle (17) and a sphere (16) fixed to one end thereof, wherein the sphere is made of a non-magnetic material obtained by mixing nickel as a binder into tungsten carbide, and A contact needle for a position detector made of a non-magnetic material obtained by age hardening beryllium copper.
4 . タングステン力一バイ卜にニッケルを結合材として混入してなる非磁 性材で製作された球体 ( 16 )であって、 その周面に柄杆 ( 17)の先端に螺合する 雄ネジ（ 18 )が接合されている、 位置検出器の接触針の接触端。 4. A spherical body (16) made of a non-magnetic material in which nickel is mixed as a binder with one byte of tungsten, and an external thread on the periphery of which is screwed to the tip of a handle (17) The contact end of the contact needle of the position detector to which (18) is joined.
PCT/JP2000/002220 1999-04-07 2000-04-06 Position sensor and contact needle WO2000062010A1 (en)

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