WO2007004515A1 - 超音波加工スピンドル装置 - Google Patents

超音波加工スピンドル装置 Download PDF

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Publication number
WO2007004515A1
WO2007004515A1 PCT/JP2006/313007 JP2006313007W WO2007004515A1 WO 2007004515 A1 WO2007004515 A1 WO 2007004515A1 JP 2006313007 W JP2006313007 W JP 2006313007W WO 2007004515 A1 WO2007004515 A1 WO 2007004515A1
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WO
WIPO (PCT)
Prior art keywords
ultrasonic
coil
shaft
vibrator
spindle device
Prior art date
Application number
PCT/JP2006/313007
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English (en)
French (fr)
Inventor
Osamu Kubota
Takayuki Yui
Hideo Hurukawa
Original Assignee
Bosch Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Bosch Corporation filed Critical Bosch Corporation
Priority to US11/993,299 priority Critical patent/US20100158307A1/en
Priority to EP06767624A priority patent/EP1902798A1/en
Publication of WO2007004515A1 publication Critical patent/WO2007004515A1/ja

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B06GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06BMETHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B29/00Holders for non-rotary cutting tools; Boring bars or boring heads; Accessories for tool holders
    • B23B29/04Tool holders for a single cutting tool
    • B23B29/12Special arrangements on tool holders
    • B23B29/125Vibratory toolholders
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B37/00Boring by making use of ultrasonic energy
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B2270/00Details of turning, boring or drilling machines, processes or tools not otherwise provided for
    • B23B2270/10Use of ultrasound
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, 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
    • B23Q2230/00Special operations in a machine tool
    • B23Q2230/004Using a cutting tool reciprocating at high speeds, e.g. "fast tool"

Definitions

  • the present invention relates to an ultrasonic machining spindle apparatus, and more particularly to an apparatus for improving the reliability of power supply to an ultrasonic wave generating element, simplifying the structure, and the like.
  • an element that generates ultrasonic waves is usually attached in the vicinity of a rotary tool and rotates with the tool.
  • the powerful ultrasonic generating element needs to be supplied with an electric signal.
  • a slip ring is attached to the shaft on which the rotary tool is held, and the slider is slid with respect to the slip ring. It is most common to provide a power supply brush as possible.
  • Patent Document 1 Japanese Patent Laid-Open No. 2002-346817
  • the present invention has been made in view of the above-described circumstances, and enables stable supply of an electrical signal to an ultrasonic wave generating element that does not cause wear or damage and that does not require periodic replacement of parts. Therefore, an ultrasonic machining spindle device that can ensure high-speed rotation is also provided.
  • an ultrasonic wave having an axis on which a vibrator for generating ultrasonic waves for ultrasonically vibrating the machine tool is disposed while the machine tool is attached.
  • a processing pindle device
  • While the shaft is provided with a receiving means connected to the vibrator and receiving an excitation signal of the vibrator transmitted from the outside in a non-contact manner,
  • an ultrasonic machining spindle device provided with a transmitting means for transmitting an electric vibration signal to the ultrasonic element in a non-contact manner with respect to the receiving means.
  • the vibrator can be driven stably, and it is reliable. If an ultrasonic machining spindle device can be provided, it has a high effect.
  • the structure does not require, for example, a slip ring that restricts the rotational speed, so that a stable workpiece can be machined at a higher rotational speed than before.
  • FIG. 1 is a configuration diagram showing a configuration example of a main part of an ultrasonic machining spindle device according to an embodiment of the present invention.
  • FIG. 2 is a configuration diagram showing another arrangement example of the reception coil and the transmission coil in the configuration example shown in FIG.
  • FIG. 3 is a configuration diagram showing a configuration of main parts in a second configuration example of the ultrasonic machining spindle device according to the embodiment of the present invention.
  • FIG. 1 shows in particular the configuration of the machining spindle 101 which is the main part of the ultrasonic machining spindle apparatus S in the embodiment of the present invention and its vicinity, and the machining spindle 101 rotates around the bearing 2a or 2b.
  • the shaft 30 is supported and a high-frequency motor 50 for rotating the shaft 30, and the shaft 30 is provided with a vibrator 6, a horn 8, etc. as an ultrasonic wave generating element as will be described later.
  • a tool gripping portion 13 for attaching the work tool 9 is provided at the tip thereof.
  • bearings 2a and 2b by ball bearings are externally mounted on the outer periphery in the vicinity of both ends of the shaft 30, and the bearings 2a and 2b are provided in the present invention.
  • the ultrasonic machining spindle device S is supported by a fixed portion (not shown), whereby the shaft 30 is rotatably supported by the bearings 2a and 2b.
  • the bearings 2a and 2b are not limited to ball bearings, and any type can be used as long as the shaft 30 can be rotatably supported.
  • a fluid bearing such as an air bearing may be used.
  • a high frequency motor 50 is incorporated in the outer periphery of the portion near the center of the shaft 30 and slightly closer to the rear end side. That is, in the high-frequency motor 50, the rotor 51 is fixed to the outer peripheral surface of the shaft 30, while the stator 52 is disposed so as to surround the rotor 51. The shaft 30 can be rotated along with the rotation of the rotor 51.
  • the high-frequency motor 50 has a known and well-known configuration, a detailed description thereof will be omitted here.
  • the shaft 30 is configured to include the housing 1 and a vibrator 6 and a horn 8 disposed therein as will be described later.
  • the housing 1 is formed in an elongated hollow shape, and opens to the rear end side (the side opposite to the end where the tool gripping portion 13 is provided), and from the outside to an appropriate position along the central axis of the housing 1.
  • An oil passage 3 for supplying cutting oil is formed.
  • An arrangement hole 4 is formed so as to open to the other end side of the housing 1 while communicating with the oil passage 3.
  • the arrangement hole 4 is formed with a small diameter portion 5a that directly communicates with the oil passage 3 and a large diameter portion 5b that follows the small diameter portion 5a.
  • a vibrator 6 made of a piezoelectric element is accommodated in the small diameter portion 5a.
  • the transducer 6 is connected to an ultrasonic transducer 7 for converting the electrical vibration of the transducer 6 into ultrasonic vibration.
  • the transducer 6 has a large diameter portion 5b in the vicinity of the small diameter portion 5a. It has been arranged in.
  • the ultrasonic transducer 7 is connected to a horn 8 that is formed in a substantially cylindrical shape for efficiently transmitting ultrasonic vibrations and is disposed in the large-diameter portion 5b.
  • the horn 8 efficiently propagates the ultrasonic wave applied via the ultrasonic transducer 7 in the axial direction, and the force is also attached to the tool gripping portion 13 provided at the tip of the horn 8.
  • the ultrasonic vibration with the maximum amplitude to the machine tool 9 to be prepared it is set to an appropriate length according to the ultrasonic frequency used and its intensity.
  • the horn 8 according to the embodiment of the present invention has an end portion protruding from the housing 1 to the outside, and a tool gripping portion 13 is provided at that portion.
  • the machine tool is attached to the tool gripping part 13 by a shrink-fitting method or screws.
  • a shrink-fitting method or screws it is not necessary to be limited to a specific one and should be arbitrarily selected.
  • the shaft 30 according to the embodiment of the present invention is provided with a receiving coil 11 for supplying an electric signal to the vibrator 6 from the outside in a non-contact manner, and connected to the vibrator 6. Yes.
  • the receiving coil 11 is formed in a substantially cylindrical shape by being mounted on a receiving coil holder 11a formed in a hollow cylindrical shape made of an insulating member. Then, the housing 1 is fitted into the hollow portion of the receiving coil holder 1 la, and the receiving coil 11 is externally mounted at an appropriate position of the housing 1! /
  • a transmission coil 12 is provided so as to be coaxial with the reception coil 11 and surround the reception coil 11 with an appropriate interval.
  • the transmission coil 12 is attached to a fixed portion (not shown) of the ultrasonic machining spindle device S according to the embodiment of the present invention.
  • the transmission coil 12 is mounted so as to be cylindrical on the inner wall of a transmission coil holder 12a, which is an insulating member formed in a substantially hollow cylindrical shape.
  • An ultrasonic drive device 21 is connected to the transmission coil 12 so that a predetermined electric signal for the vibrator 6 is applied. Normally, the vibrator 6 is driven by applying a pulse signal, a sine wave signal, or the like, but such a predetermined signal is applied to the transmission coil 12 from the ultrasonic driving device 21.
  • the voltage and current corresponding to the change in the transmission coil 12 and the current in the transmission coil 12 are generated in the reception coil 11 by electromagnetic induction and applied to the vibrator 6. 6 will be driven.
  • a rectifier circuit or the like is provided between the receiving coil 11 and the vibrator 6 so that the voltage and current induced in the receiving coil 11 are converted to a desired level, waveform shaping, etc. It is also suitable as a configuration in which voltage is applied to.
  • the receiving coil 11 and the transmitting coil 12 are connected to the housing 1 in a ratio. Although it is disposed in the vicinity of the relatively central portion, it is of course not necessary to be limited to this. For example, it may be configured to be disposed on the rear end side of the housing 1 as shown in FIG.
  • the reception coil 11A is disposed at the step portion la formed at the rear end portion of the housing 1, while the transmission coil 12A is disposed coaxially with the reception coil 11A. ing.
  • the second configuration example is an example in which the reception coil 11B and the transmission coil 12B are arranged on the same virtual axis with an appropriate interval.
  • the receiving coil 11B is disposed in a stepped portion la formed at the rear end portion of the housing 1, and the center of the receiving coil 11B is virtually a virtual axis 30.
  • the central axis in other words, coincides with the virtual central axis of the housing 1.
  • the transmission coil 12B is provided on the virtual central axis of the reception coil 11B described above at an appropriate interval in the direction away from the shaft 30.
  • the transmission coil 12B is supported by a fixed portion (not shown) of the ultrasonic machining spindle device S.
  • the ultrasonic machining spindle device unlike the conventional one, a device that restricts the rotational speed of the shaft such as a slip ring is used for driving the vibrator 6. Therefore, it is possible to obtain a shaft rotation that is faster and more stable than the conventional one.
  • the configuration is such that electrical energy can be supplied to the ultrasonic transducer in a non-contact manner, and the configuration can be simplified and miniaturized as compared with the conventional case. It is particularly suitable for a device in which downsizing is desired.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Turning (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Drilling And Boring (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Abstract

 部品の摩耗や損傷を生ずることなく、また、定期的な部品交換を要することなく、超音波発生素子へ対する安定した電気信号の供給を可能する。  加工スピンドル101の軸30を構成するハウジング1の外周面には、振動子6に接続された受信コイル11が巻装される一方、その周囲には、同軸状に送信コイル12が適宜な間隔を隔てて設けられており、超音波駆動装置21から出力された振動子6を駆動するための所定の電気信号が送信コイル12に印加され、送信コイル12と受信コイル11間の電磁誘導により受信コイル11を介して振動子6へ所定の電気信号の印加が可能となっている。

Description

明 細 書
超音波加工スピンドル装置
技術分野
[0001] 本発明は、超音波加工スピンドル装置に係り、特に、超音波発生素子へ対する電 力供給の信頼性向上、構造の簡素化等を図ったものに関する。
背景技術
[0002] 近年、工具の軸方向に超音波振動を与えながら加工作業を行う超音波ミリングと称 される加工法を用いた工作機械が、加工精度の向上や切粉の円滑な排出等を実現 できることから種々提案されて!ヽる (例えば、特許文献 1等参照)。
このような超音波ミリングを行う装置において、超音波を発生する素子は、通常、回 転工具の近傍に取り付けられて、工具と共に回転する構造が採られている。そして、 力かる超音波発生素子は、電気信号の供給が必要であるが、この電気信号の供給 に際しては、回転工具が保持される軸にスリップリングを取り付けると共に、このスリツ プリングに対して摺動可能に給電ブラシを設けた構成とするのが最も一般的である。
[0003] し力しながら、上述のような従来の構成では、スリップリングと給電ブラシとが常に接 触するため、摩耗や損傷が激しぐそのため、給電ブラシの交換が頻繁となるばかり 力 安定で信頼性の高い加工作業が確保できないという問題に加え、スリップリング における摩耗や損傷の軽減のために回転数には限界があり、高速回転の要請に応 えることができな力つた。
特許文献 1 :特開 2002— 346817号公報
発明の開示
発明が解決しょうとする課題
[0004] 本発明は、上記実状に鑑みてなされたもので、摩耗や損傷を生ずることなぐまた、 定期的な部品交換を要することなぐ超音波発生素子へ対する安定した電気信号の 供給を可能とし、し力も、高速回転を確保することのできる超音波加工スピンドル装置 を提供するものである。
課題を解決するための手段 [0005] 本発明の形態によれば、工作工具が取着されると共に、前記工作工具を超音波振 動せしめる超音波を発生する振動子が配設されてなる軸を有してなる超音波加エス ピンドル装置であって、
前記軸には前記振動子に接続され、外部から非接触で送信された前記振動子の 励振信号を受信する受信手段が設けられる一方、
前記軸の近傍には、前記受信手段に対して非接触で前記超音波素子へ対する電 気振信号を送信する送信手段が設けられてなる超音波加工スピンドル装置が提供さ れる。
発明の効果
[0006] 本発明によれば、従来と異なり、振動子を駆動するための電気的エネルギーを軸の 周囲から非接触で供給できるので、かかる電気的得ネルギー供給のために摩耗、損 傷等するような部品がないばかりか、従来の給電ブラシのように定期的な交換を必要 とする部品を用いる必要がなぐそのため、振動子の駆動を安定して行うことができ、 ひ!、ては信頼性の高!、超音波加工スピンドル装置を提供することができると 、う効果 を奏するものである。
また、従来と異なり、回転速度に制限を及ぼすような例えば、スリップリングのような ものを必要としな 、構成であるため、従来に比してより高い回転数で安定した工作物 の加工ができると!、う効果を奏するものである。
図面の簡単な説明
[0007] [図 1]本発明の実施の形態における超音波加工スピンドル装置の主要部の構成例を 示す構成図である。
[図 2]図 1に示された構成例における受信コイルと送信コイルの他の配設例を示す構 成図である。
[図 3]本発明の実施の形態における超音波加工スピンドル装置の第 2の構成例にお ける主要部の構成を示す構成図である。
符号の説明
[0008] 1…ハウジング
2a, 2b…軸受け 6…振動子
7…超音波トランスデューサ
8· · ·ホーン
9…工作工具
11 · · ·受信コイル
12…送信コイル
30· · ·軸
50· · ·高周波モータ
101 · · ·カ卩エスピンドノレ
発明を実施するための最良の形態
[0009] 以下、本発明の実施の形態について、図 1乃至図 3を参照しつつ説明する。
なお、以下に説明する部材、配置等は本発明を限定するものではなぐ本発明の 趣旨の範囲内で種々改変することができるものである。
最初に、本発明の実施の形態における超音波加工スピンドル装置の構成例につい て、図 1を参照しつつ説明する。
図 1は、特に、本発明の実施の形態における超音波加工スピンドル装置 Sの主要部 となる加工スピンドル 101及びその近傍の構成を示したもので、加工スピンドル 101 は、軸受け 2aか 2bに回動可能に支持された軸 30と、この軸 30を回動するための高 周波モータ 50を有すると共に、軸 30には後述するように超音波発生素子としての振 動子 6、ホーン 8などが設けられ、また、その先端部には工作工具 9を取着する工具 把持部 13が設けられて構成されたものとなっている。
[0010] 以下、具体的に説明すれば、まず、軸 30の両端部近傍の外周には、ボールべァリ ングによる軸受け 2a, 2bが外装されると共に、この軸受け 2a, 2bは、本発明の実施 の形態における超音波加工スピンドル装置 Sの図示されない固定部位に支持される ようになっており、それによつて軸 30が回動可能に軸受け 2a, 2bによって支持された ものとなっている。なお、軸受け 2a, 2bは、ボールベアリングに限定される必要はなく 、軸 30を回動可能に支持できるものであれば種類を問わない。例えば、エアーベア リング等の流体軸受けであってもよい。 [0011] さらに、軸 30の中央付近力 やや後端部側へ寄った部位の外周には、高周波モー タ 50が組み込まれている。すなわち、高周波モータ 50は、軸 30の外周面にロータ 5 1が固着される一方、このロータ 51を囲むようにステータ 52が配置されたものとなって いる。そして、ロータ 51の回転と共に軸 30が回転できるようになつている。
なお、かかる高周波モータ 50は、公知 '周知の構成のものであるので、ここでの詳 細な説明は省略することとする。
[0012] 一方、軸 30は、ハウジング 1と、後述するようにその内部に配設される振動子 6、ホ ーン 8などを有して構成されたものとなって 、る。
ハウジング 1は、細長中空状に形成されて、その後端部側(工具把持部 13が設けら れる端部と反対側)に開口し、ハウジング 1の中心軸に沿って適宜な位置まで外部か ら切削油を供給するための油路 3が形成されている。そして、この油路 3に連通すると 共にハウジング 1の他端側に開口するようにして配設孔 4が穿設されて 、る。
配設孔 4は、油路 3に直接連通する小径部 5aと、この小径部 5aに続く大径部 5bと が形成されたものとなって 、る。
[0013] 小径部 5aには、例えば、圧電素子による振動子 6が収納されている。この振動子 6 には、振動子 6の電気的振動を超音波振動に変換するための超音波トランスデュー サ 7が接続されており、この構成例では、小径部 5a近傍の大径部 5b内に配設された ものとなっている。
そして、この超音波トランスデューサ 7には、超音波振動を効率よく伝導させるため のほぼ円柱状に形成されたホーン 8が接続されて大径部 5bに配設されたものとなつ ている。
[0014] ホーン 8は超音波トランスデューサ 7を介して印加された超音波をその軸方向に効 率よく伝搬させて、し力も、ホーン 8の先端部に設けられた工具把持部 13に取着され る工作工具 9に最大振幅で超音波振動を伝えるため、使用される超音波周波数やそ の強度等に応じて適宜な長さに設定されているものである。
[0015] 本発明の実施例におけるホーン 8は、その一端部近傍がハウジング 1から外部へ 突出して、その部分に工具把持部 13が設けられたものとなっている。
なお、工具把持部 13への工作工具の取り付けは、焼きばめ方式による固定やねじ を用いた固定などがあるが、本発明の実施の形態においては、特定のものに限定さ れる必要はなく任意に選択されるべきものである。
[0016] さらに、本発明の実施の形態の軸 30には、振動子 6に外部から非接触で電気信号 の供給を行うための受信コイル 11が設けられており、振動子 6に接続されている。す なわち、受信コイル 11は、絶縁部材からなる中空円筒状に形成された受信コイルホ ルダ 11aに卷装されてほぼ円筒状に形成されている。そして、この受信コイルホルダ 1 laの中空部分にハウジング 1が嵌挿されてハウジング 1の適宜な位置に受信コイル 11が外装されたものとなって!/、る。
[0017] 一方、この受信コイル 11に対して同軸状で、適宜な間隔を介して受信コイル 11を 囲むように送信コイル 12が設けられている。この送信コイル 12は、本発明の実施の 形態における超音波加工スピンドル装置 Sの図示されない固定部位に取り付けられ るものとなっている。
本発明の実施の形態における送信コイル 12は、ほぼ中空円筒状に形成された絶 縁部材カゝらなる送信コイルホルダ 12aの内壁に円筒状となるように卷装されたものと なっている。
[0018] この送信コイル 12には超音波駆動装置 21が接続されており、振動子 6へ対する所 定の電気信号が印加されるようになっている。通常、振動子 6の駆動は、パルス信号 や正弦波信号などの印加によって行われるが、超音波駆動装置 21からはそのような 所定の信号が送信コイル 12に印加されることとなる。
[0019] そして、送信コイル 12において生ずる電圧、電流変化によって、受信コイル 11には 電磁誘導により送信コイル 12における電圧、電流変化に応じた電圧、電流が生じ、 振動子 6に印加され、振動子 6が駆動されることとなる。なお、受信コイル 11と振動子 6との間に、整流回路等を設け、受信コイル 11に誘起された電圧、電流を所望のレ ベルへの変換、波形整形等を施した後に、振動子 6へ印加するような構成としても好 適である。
なお、超音波加工スピンドル装置 Sとしての全体的な動作は、公知のものと基本的 に変わるところがないので、その詳細な説明は省略することとする。
[0020] 上述の構成例においては、受信コイル 11及び送信コイル 12を、ハウジング 1の比 較的中央部近傍に配設したが、勿論これに限定される必要はなぐ例えば、図 2に示 されたようにハウジング 1の後端側に配設するような構成であってもよい。
すなわち、図 2においては、ハウジング 1の後端部に形成された段部 laに受信コィ ル 11Aが配設される一方、受信コイル 11Aと同軸状に送信コイル 12Aが配設された ものとなっている。
なお、動作、機能等については、図 1に示された構成例と基本的に変わるところは 無いので、再度の詳細な説明は省略することとする。
[0021] 次に、第 2の構成例について、図 3を参照しつつ説明する。なお、図 1に示された構 成例と同一の構成要素については、同一の符号を付して、その詳細な説明を省略し 、以下、異なる点を中心に説明する。
この第 2の構成例は、受信コイル 11Bと送信コイル 12Bを仮想的な同一軸上に適 宜な間隔を隔てて配設した例である。
[0022] すなわち、具体的には、受信コイル 11Bはハウジング 1の後端部に形成された段部 laに配設されたものとなっており、受信コイル 11Bの中心がほぼ軸 30の仮想的な中 心軸、換言すれば、ハウジング 1の仮想的な中心軸に一致するものとなっている。 一方、送信コイル 12Bは、上述の受信コイル 11Bの仮想的な中心軸上において、 軸 30から離れる方向へ適宜な間隔を隔てて設けられたものとなっている。そして、こ の送信コイル 12Bは、超音波加工スピンドル装置 Sの図示されない固定部位に支持 されるようになつている。
なお、動作、機能等については、図 1に示された構成例と基本的に変わるところは 無いので、再度の詳細な説明は省略することとする。
[0023] このように、本発明の実施の形態における超音波加工スピンドル装置においては、 従来と異なり、振動子 6の駆動のためにスリップリングのような軸の回転速度に制限を 及ぼすものを用いることがない構成であるために、従来に比してより高速で、かつ、安 定した軸回転を得ることができるものとなって 、る。
産業上の利用可能性
[0024] 超音波振動子へ対する電気的エネルギの供給が非接触で行えるよう構成されて、 従来に比して構成の簡素化、小型化が可能となっており、超音波加工スピンドル装 置であって、特に、小型化が所望されるものに適する。

Claims

請求の範囲
[1] 工作工具が取着されると共に、前記工作工具を超音波振動せしめる超音波を発生 する振動子が配設されてなる軸を有してなる超音波加工スピンドル装置であって、 前記軸には前記振動子に接続され、外部から非接触で送信された前記振動子の 励振信号を受信する受信手段が設けられる一方、
前記軸の近傍には、前記受信手段に対して非接触で前記超音波素子へ対する電 気信号を送信する送信手段が設けられてなることを特徴とする超音波加工スピンドル 装置。
[2] 受信手段は、軸に取着されたコイルを有してなり、送信手段は、前記軸に取着された コイルと電磁的に結合可能に前記軸近傍に設けられたコイルを有してなることを特徴 とする請求項 1記載の超音波加工スピンドル装置。
[3] 受信手段を構成するコイルは、軸の外周面に設けられる一方、送信手段を構成する コイルは、前記軸の外周面に設けられたコイルを囲むように同軸状に設けられてなる ことを特徴とする請求項 2記載の超音波加工スピンドル装置。
[4] 受信手段を構成するコイルと送信手段を構成するコイルは、仮想的な同一の軸上に
、適宜な間隔を隔てて設けられてなることを特徴とする請求項 2記載の超音波加エス ピンドル装置。
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