JP2001328014A - Chuck - Google Patents
ChuckInfo
- Publication number
- JP2001328014A JP2001328014A JP2000153131A JP2000153131A JP2001328014A JP 2001328014 A JP2001328014 A JP 2001328014A JP 2000153131 A JP2000153131 A JP 2000153131A JP 2000153131 A JP2000153131 A JP 2000153131A JP 2001328014 A JP2001328014 A JP 2001328014A
- Authority
- JP
- Japan
- Prior art keywords
- collet
- yoke
- chuck
- permanent magnet
- pole
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
Landscapes
- Gripping On Spindles (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】被把持体の外径をコレットを
縮径させることにより均一な圧力で把持するもので丸材
の加工若しくは計測又は工具の把持に使用するチャック
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chuck for holding an object to be gripped with a uniform pressure by reducing the outer diameter of a body to be gripped, and for processing or measuring a round material or gripping a tool.
【0002】[0002]
【従来の技術】現在、ホルダにおける丸材例えばドリル
やフライス工具のクランプ方式は手締めが一般的であ
る。手締め方式の代表的なものとして、(1)コレット
ホルダ,(2)ハイドロチャックがある。コレットホル
ダはホルダ本体先端部のナットを回転させコレットを軸
芯方向に移動させることにより縮径させコレットの中心
穴に嵌入した丸軸を外周から均等に押圧して把持するも
ので、工具を用いてナットを螺入させる場合には軸の固
定は強固である。また、ハイドロチャックは、ホルダ本
体に内蔵されたオイルの高い圧力と金属スリーブの弾性
変形を利用して挿入した丸軸を強く把持するもので金属
スリーブの形状によりチャック内径から均等な圧力を丸
軸に加えることが可能である。金属スリーブを弾性変形
させるための工具はレンチであり、作業は手締めであ
る。2. Description of the Related Art At present, hand clamping is generally used for clamping a round material such as a drill or a milling tool in a holder. Representative examples of the hand tightening method include (1) a collet holder and (2) a hydro chuck. The collet holder is designed to reduce the diameter by rotating the nut at the tip of the holder main body and moving the collet in the axial direction to uniformly press and hold the round shaft fitted in the center hole of the collet from the outer periphery using a tool. When the nut is screwed in, the shaft is firmly fixed. In addition, the hydro chuck uses the high pressure of the oil built into the holder body and the elastic deformation of the metal sleeve to strongly grip the inserted round shaft. It is possible to add A tool for elastically deforming the metal sleeve is a wrench, and the work is hand-tightened.
【0003】[0003]
【発明が解決しようとする課題】従来技術における丸材
のクランプ方式は手締めが一般的である。また、手締め
の際には、シャンク部を保持してねじ部を締めつける段
取り工具が必要である。主軸の高速回転化に伴いシャン
クの形状にも複数の規格が存在するようになったので、
これに対応するために締め付け段取り部の付け替え等に
工夫が必要となっている。更にホルダの種類やサイズご
とに違った締め付け具が必要なので、これらの段取りや
工具の管理に労力と時間を要する。従来のホルダでは固
定時のクランプ力は、ねじの締め付けを手締めで行うの
でクランプ力にばらつきが生じやすい。またねじ部に強
度が必要なためホルダ部の材質が制限され、把持できる
工具の種類にも制限がある。本発明は従来技術の有する
このような問題に鑑みなされたものであり、その目的と
するところは、コレットを縮径させる際に締め付ける工
具や段取りを必要とせず、一定の緊定力を発生させるこ
とができるバランスの良好で高精度なチャックを提供し
ようとするものである。In the prior art, the method of clamping a round material is generally manual tightening. In the case of manual tightening, a setup tool for holding the shank and tightening the screw is required. With the high speed rotation of the spindle, there are several standards for the shank shape.
In order to cope with this, it is necessary to devise a method of replacing a fastening setup part. Further, different fasteners are required for each type and size of the holder, so that the setup and management of the tools require labor and time. In the conventional holder, the clamping force at the time of fixing tends to vary because the screw is manually tightened. Further, the strength of the screw portion is required, so that the material of the holder portion is limited, and the types of tools that can be gripped are also limited. SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems of the related art, and has as its object to generate a constant tightening force without the need for a tool or setup to reduce the diameter of a collet. It is an object of the present invention to provide a high-precision chuck having a good balance that can be performed.
【0004】[0004]
【課題を解決するための手段】上記目的を達成するため
に請求項1に記載された本発明のチャックは、中心に丸
材を把持する孔と外周の少なくとも一端寄りに軸テーパ
を形成した縮径可能なコレットと、該コレットを芯出し
するチャック本体と緊定体の少なくとも一方に前記軸テ
ーパに対応するテーパ孔を設けて該コレットを位置決め
するコレット位置決め部材と、前記チャック本体と緊定
体のいずれか一方に励磁磁石を設け励磁時に他方を吸着
させて前記コレットを縮径するコレット縮径部材を含ん
でなり、コレットの縮径により丸材を把持するものであ
る。According to a first aspect of the present invention, there is provided a chuck according to the first aspect of the present invention, wherein a hole for holding a round material is formed at the center and an axial taper is formed at least at one end of the outer periphery. A possible collet, a collet positioning member for positioning the collet by providing a taper hole corresponding to the shaft taper in at least one of the chuck body and the tensioning body for centering the collet, and the chuck body and the tensioning body. A collet reducing member is provided on one of the magnets to reduce the diameter of the collet by attracting the other magnet at the time of excitation.
【0005】請求項1のチャックは、コレットを縮径さ
せる手段として、コレットの芯出しとコレットの縮径を
するためにチャック本体と緊定体とからなるコレット位
置決め部材を設ける。チャック本体と緊定体とがコレッ
トを挟持して接近させるためにねじを用いず、協力な磁
石の吸引力を利用することにより達成している。従って
コレットを縮径させる力は常に一定であり、格別の段取
りや工具を必要としない。In the chuck according to the first aspect, as a means for reducing the diameter of the collet, a collet positioning member including a chuck body and a tightening body is provided for centering the collet and reducing the diameter of the collet. This is achieved by using a cooperative magnet's attractive force without using a screw to clamp the collet between the chuck body and the tightening body and approach them. Therefore, the force for reducing the diameter of the collet is always constant, and no special setup or tool is required.
【0006】また、請求項2に記載された本発明のチャ
ックは、前記コレット縮径部材が、前記チャック本体ま
たは前記緊定体のいずれか一方の中心穴の外周にその軸
芯に対し対称かつ平行に一対以上設けた第1継鉄の各側
面に第1永久磁石のN極面を吸着させて形成したN型継
鉄と、前記第1継鉄の各側面に前記第1永久磁石のS極
面を吸着させて形成したS型継鉄と、前記N型継鉄の一
端には第2永久磁石のS極面を前記S型継鉄の一端には
第2永久磁石のN極面を吸着させて前記第2永久磁石を
同一端に揃えて前記N型継鉄と前記S型継鉄を交互に配
列し方形状または円形状に構成した磁石構造体と、前記
第2永久磁石のそれぞれの外周に通電用コイルを巻回し
た励磁コイルと、該励磁コイルへの通電により前記N型
継鉄の前記第1継鉄の他端にN極を発生させ前記S型継
鉄の前記第1継鉄の他端にS極の磁極を発生させ前記緊
定体または前記チャック本体のいずれかを吸引して前記
コレットを縮径させ、前記励磁コイルへの通電方向を逆
にして前記他端に発生したN極及びS極の磁極を消失さ
せて前記第2継鉄の吸引を解消して前記コレットの径を
回復するようにしたものである。According to a second aspect of the present invention, in the chuck of the present invention, the collet reduced-diameter member is symmetrical with respect to an axis thereof around an outer periphery of a center hole of one of the chuck body and the tightening body. An N-type yoke formed by adsorbing the N pole surface of the first permanent magnet on each side surface of the first yoke provided in parallel with one or more pairs, and the S of the first permanent magnet is formed on each side surface of the first yoke. An S-type yoke formed by adsorbing a pole surface, an S-pole surface of a second permanent magnet at one end of the N-type yoke, and an N-pole surface of a second permanent magnet at one end of the S-type yoke. A magnet structure in which the N-type yoke and the S-type yoke are alternately arranged by adsorbing and aligning the second permanent magnets at the same end to form a square or circular shape, and the second permanent magnet, respectively. An exciting coil in which an energizing coil is wound around the outer periphery of the first coil; The other end of the S-type yoke generates an N-pole at the other end, and the S-type yoke generates a S-pole at the other end of the first yoke, and attracts either the tensioner or the chuck body to shrink the collet. And the direction of energization to the exciting coil is reversed so that the N-pole and S-pole generated at the other end are eliminated to eliminate the suction of the second yoke and recover the diameter of the collet. It was made.
【0007】請求項2のチャックは、コレット縮径部材
として強力な吸引力を発生する磁石構造体を設けてい
る。磁石構造体の励磁コイルへの最初の短時間の通電に
よた第1継鉄の端面にN極とS極を交互に発生させて第
2継鉄との間に永続的に磁気回路を形成させて吸着を持
続させる。この状態で、次の短時間の逆方向通電によ
り、第1継鉄の端面のN極とS極は消失する。その結
果、第2継鉄との間の磁気回路も消失し吸着から解放さ
れる。従ってコレットの縮径を維持するため常時通電す
る必要がないので、そのための装置が不要である。The chuck according to a second aspect of the present invention is provided with a magnet structure that generates a strong attractive force as a collet diameter reducing member. An N-pole and an S-pole are alternately generated on the end face of the first yoke by the first short-time energization of the exciting coil of the magnet structure to form a permanent magnetic circuit with the second yoke. To maintain adsorption. In this state, the N-pole and the S-pole on the end face of the first yoke disappear by the next short-time reverse energization. As a result, the magnetic circuit with the second yoke also disappears and is released from the adsorption. Therefore, since it is not necessary to constantly supply power to maintain the diameter of the collet reduced, a device for this purpose is not required.
【0008】また請求項3に記載された本発明のチャッ
クは、前記第1継鉄の断面が角形形状に形成されてなる
ものである。請求項3のチャックは、工具の形状と重量
により工具を支えるのに充分な磁石の吸引力を確保する
ために必要な条件とチャックに許容される外形に求めら
れる条件とから第1継鉄の形状が設計されることを意味
している。According to a third aspect of the present invention, there is provided the chuck, wherein the cross section of the first yoke is formed in a square shape. The chuck according to claim 3 is characterized in that the first yoke is made up of a condition necessary for securing a magnet attraction force sufficient to support the tool by the shape and weight of the tool and a condition required for an outer shape allowed for the chuck. It means that the shape is designed.
【0009】請求項4に記載された本発明のチャック
は、前記第1継鉄の断面が扇形状に形成されてなるもの
である。請求項4のチャックは、第1継鉄の形状を扇形
状に設計した場合は外形を円形状にコンパクトな設計が
可能となる。According to a fourth aspect of the present invention, there is provided the chuck, wherein the cross section of the first yoke is formed in a fan shape. In the chuck of the fourth aspect, when the shape of the first yoke is designed to be a fan shape, the outer shape can be designed to be compact with a circular shape.
【0010】また請求項5に記載された本発明のチャッ
クは、前記励磁石コイルに通電して前記コレットを縮径
させる前に、装着後の前記チャック本体と前記緊定体間
で磁力を作用させるよう前記緊定体または前記チャック
本体の少なくとも一方に第3永久磁石を設けてなるもの
である。請求項5のチャックは、主軸のテーパの穴にチ
ャック本体を装着後にチャック本体のテーパ穴にコレッ
トを嵌着し、緊定体でコレットを軸方向へ押し進めコレ
ットがチャック本体のテーパ穴に完全に密着した状態で
緊定体の両者を第3永久磁石で吸引させておくようにし
たもので、チャックを竪形主軸に装着する際は緊定体の
落下防止となる。励磁コイルに通電して第1継鉄と第2
継鉄が吸着するまで第3永久磁石で吸引させておくもの
である。Further, in the chuck according to the present invention, a magnetic force acts between the chuck body after the mounting and the tensioning member before energizing the exciting magnet coil to reduce the diameter of the collet. A third permanent magnet is provided on at least one of the tightening body and the chuck body so as to perform the operation. In the chuck according to the fifth aspect, the collet is fitted into the tapered hole of the chuck body after the chuck body is mounted in the tapered hole of the main shaft, and the collet is pushed in the axial direction by the tightening body, and the collet is completely inserted into the tapered hole of the chuck body. Both of the tightening bodies are attracted by the third permanent magnet in a state where they are in close contact with each other. When the chuck is mounted on the vertical spindle, the tightening bodies are prevented from dropping. Energize the exciting coil to make the first yoke and the second yoke
Until the yoke is adsorbed, it is attracted by the third permanent magnet.
【0011】また、請求項6に記載された本発明のチャ
ックは、前記緊定体と前記チャック本体との間で前記第
3永久磁石による磁力を作用させる前に、前記チャック
本体と前記緊定体とを係合させる螺合またはバイヨネッ
ト結合の係合部を設けてなり、該係合部脱出後に前記チ
ャック本体の軸芯方向に移動して該チャック本体と前記
緊定体とを吸引させるものである。請求項6のチャック
は、前記チャック本体と前記緊定体の通電前の係合をよ
り確実にするものである。Further, in the chuck according to the present invention, the chuck body and the tensioning member may be connected to each other before the magnetic force by the third permanent magnet is applied between the clamping member and the chuck body. A threaded or bayonet-coupled engaging portion for engaging the body, and moving out of the engaging portion in the axial direction of the chuck body to suck the chuck body and the tensioning body. It is. In the chuck according to the sixth aspect, the engagement between the chuck body and the tensioning member before energization is further ensured.
【0012】[0012]
【発明の実施の形態】以下本発明の実施の形態を図面に
基づいて説明する。図1は本発明の実施例1のチャック
1の断面図である。チャック本体2に磁石構造体4が設
けられている。図3は図1に示すチャック本体2に設け
た磁石構造体4の拡大断面図である。磁石構造体4の給
電部、第3永久磁石による緊定体3の仮保持部5,チャ
ック本体2と緊定体3との螺合またはバイヨネットによ
る係合部6を示している。図3ではチャック本体2と緊
定体3の両者にコレット7の案内穴を設けているのに対
しチャック本体2側のみコレット7の案内穴を設けた実
施例を示している。図5(a)(b)(c)は磁石構造
体4を構成するN型継鉄とS型継鉄の配置図である。図
6(a)(b)は、磁石構造体4を構成するN型継鉄と
S型継鉄の機能説明図である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a chuck 1 according to a first embodiment of the present invention. A magnet structure 4 is provided on the chuck body 2. FIG. 3 is an enlarged sectional view of the magnet structure 4 provided on the chuck body 2 shown in FIG. The power supply unit of the magnet structure 4, the temporary holding unit 5 of the tightening body 3 by the third permanent magnet 5, and the engaging unit 6 of the chuck body 2 and the tightening body 3 by screwing or bayonet are shown. FIG. 3 shows an embodiment in which the guide holes for the collet 7 are provided on both the chuck body 2 and the tensioning member 3, whereas the guide holes for the collet 7 are provided only on the chuck body 2 side. FIGS. 5A, 5B, and 5C are layout diagrams of an N-type yoke and an S-type yoke constituting the magnet structure 4. FIG. FIGS. 6A and 6B are explanatory diagrams of functions of the N-type yoke and the S-type yoke constituting the magnet structure 4.
【0013】[0013]
【実施例】〔実施例1〕図1において、磁石構造体4
(図5に示す)はチャック本体2に設けられている。コ
レット7は縮径するスプリングコレットであって、チャ
ック本体2のテーパ穴2aとこの穴と対峙する緊定体3
のテーパ穴3aにより挟持されている。コレット7には
中心に丸材8が挿入可能に丸穴が穿孔されている。丸材
8としては、ドリル,フライス工具または被計測ワーク
等が考えられる。椀状に形成されテーパ穴3aが底部中
央に刻設された緊定体3は、上部内径部とチャック本体
2の下端外径部とはねじまたはバイヨネットで係合する
ように係合部6が設けられている。[Embodiment 1] In FIG.
(Shown in FIG. 5) is provided on the chuck body 2. The collet 7 is a spring collet that reduces its diameter, and includes a tapered hole 2a of the chuck body 2 and a tension member 3 facing the hole.
Of the tapered hole 3a. A round hole is formed in the collet 7 so that a round material 8 can be inserted into the center. As the round material 8, a drill, a milling tool, a work to be measured, or the like can be considered. The tightening body 3 formed in a bowl shape and having a tapered hole 3a engraved at the center of the bottom has an engaging portion 6 which is engaged with the upper inner diameter portion and the lower outer diameter portion of the chuck body 2 by a screw or bayonet. Is provided.
【0014】コレット7がテーパ穴面2bを有するチャ
ック本体2と緊定体3で挟持され、緊定体3がホルダ本
体2との係合部6を脱出しコレット7がテーパ穴2aと
テーパ穴3aとで位置決めされた状態となる。この位置
決め状態は、チャック本体2と緊定体3の材質により、
両者の対峙する端面に第3永久磁石9を設けて吸引させ
隙間S1で保持される。仮保持する第3永久磁石9の吸
引力は、コレット7を縮径させる程の軸方向力を有しな
くて良い。吸引されている状態では緊定体3と第1継鉄
10との間にはS2の隙間が残されている。A collet 7 is sandwiched between the chuck body 2 having the tapered hole surface 2b and the tightening member 3, and the tightening member 3 escapes from the engagement portion 6 with the holder body 2, and the collet 7 forms the tapered hole 2a and the tapered hole. 3a. This positioning state depends on the material of the chuck body 2 and the tension body 3.
A third permanent magnet 9 is provided on the end faces facing each other and is attracted and held in the gap S1. The attraction force of the temporarily held third permanent magnet 9 does not have to have an axial force enough to reduce the diameter of the collet 7. In the state of being sucked, a gap of S2 is left between the tension member 3 and the first yoke 10.
【0015】図3に示す緊定体3の材質がアルミニュー
ム系軽金属やその他の非鉄金属または非帯磁性金属の場
合、第1継鉄に相対する面に第2継鉄20を別に付加す
る必要がある。チャック1,11,21を構成するコレ
ット7,22の縮径を操作する磁石構造体4の基本的な
構成は共通する。しかし、丸材8の直径寸法によりコレ
ット7の形状寸法が、また丸材8の重量からコレット7
を縮径させる磁石構造体4の外形寸法が設計上定められ
る。チャックは、取扱上外形寸法をなるべく小さく構成
するのが望ましい。従って許容される寸法内で最大の吸
引力を発揮する磁石構造体4を設計するよう要求され
る。When the material of the tension member 3 shown in FIG. 3 is an aluminum-based light metal or other non-ferrous metal or non-magnetic metal, a second yoke 20 must be separately added to the surface facing the first yoke. There is. The basic structure of the magnet structure 4 for controlling the diameter reduction of the collets 7, 22 constituting the chucks 1, 11, 21 is common. However, the shape and size of the collet 7 depend on the diameter of the round material 8, and the collet 7 depends on the weight of the round material 8.
The outer dimensions of the magnet structure 4 for reducing the diameter are determined by design. It is desirable that the chuck be configured to have as small an external dimension as possible in handling. Therefore, it is required to design the magnet structure 4 that exhibits the maximum attractive force within the allowable dimensions.
【0016】図5は、磁石構造体4を構成するN型継鉄
12,S型継鉄13の配置図で、実施例1乃至3に共通
して適用可能である。図5(a)は、コレット7の装着
面2aを中心に、その外周部分に面取りした断面四辺形
の第1継鉄10を方形状に配置したものである。第1継
鉄10と第1永久磁石14の構成は後述する。図5
(b)は、第1継鉄10の断面を扇形に形成し、外周を
多角形にして第1永久磁石14を配したもので磁石構造
体4を小型に構成できる。FIG. 5 is a layout view of the N-type yoke 12 and the S-type yoke 13 constituting the magnet structure 4 and can be applied commonly to the first to third embodiments. FIG. 5A is a diagram in which a first yoke 10 having a quadrangular cross section chamfered on an outer peripheral portion of the mounting surface 2a of the collet 7 is arranged in a square shape. The configuration of the first yoke 10 and the first permanent magnet 14 will be described later. FIG.
2B, the cross section of the first yoke 10 is formed in a sector shape, the outer periphery is polygonal, and the first permanent magnets 14 are arranged, so that the magnet structure 4 can be made compact.
【0017】図5(c)はコレット7の形状が大きい場
合の第1継鉄10の配置図であって、第1継鉄10は細
分化されるがN型継鉄12とS型継鉄13とで構成する
磁石構造体4の吸引力は増大させることができるのでコ
レット7を縮径させる能力は大きく設計することができ
る。FIG. 5C is a layout view of the first yoke 10 when the shape of the collet 7 is large. The first yoke 10 is subdivided, but the N-type yoke 12 and the S-type yoke 12 are provided. 13 can increase the attraction force of the magnet structure 4 composed of the magnet 13 and the collet 7 can be designed to have a large ability to reduce the diameter.
【0018】次に、N型継鉄12とS型継鉄13におけ
る第1継鉄10と第1永久磁石14との構成について説
明する。この構成は実施例1乃至3に共通して適用可能
である。図6は磁石構造体4の断面図を示している。図
6(a)においてチャック本体2(または緊定体3)に
N型継鉄12とS型継鉄13が隣接して配置されてい
る。N型継鉄とは偶数の第1継鉄10が隣接する側面に
1以上の第1永久磁石14のN極面を吸着させたものを
いい、S型継鉄とはS極面を吸着して形成したものをい
う。Next, the configuration of the first yoke 10 and the first permanent magnet 14 in the N-type yoke 12 and the S-type yoke 13 will be described. This configuration can be applied commonly to the first to third embodiments. FIG. 6 shows a sectional view of the magnet structure 4. In FIG. 6A, an N-type yoke 12 and an S-type yoke 13 are arranged adjacent to the chuck body 2 (or the tension member 3). The N-type yoke refers to an even number of first yoke 10 having the N pole face of one or more first permanent magnets 14 attracted to the adjacent side face, and the S-type yoke attracts the S pole face. Means the one formed.
【0019】第1永久磁石14を吸着させていないN型
継鉄12の一端10cには第2永久磁石15のS極の磁
極面を吸着させ、S型継鉄13の一端には第2永久磁石
15のN極の磁極面を吸着させる。第2永久磁石15と
第1継鉄10との吸着面に直交する軸線とし第2永久磁
石15の外周には励磁コイル16が巻回されている。第
1継鉄10の他端10dには第2継鉄17が隙間S2だ
け離れて設けられている。S2の隙間が0になるのは、
励磁コイル16に通電され、第1継鉄10の端面10a
側にN型継鉄12の場合はN極が生じ、S型継鉄13の
場合にS極が生じ、第2継鉄20との間で磁気回路が形
成され、第2継鉄20が吸引される場合である〔図6
(a)〕。ここで第2継鉄20を別部品として付加する
のはチャック本体2または緊定体3が磁気回路を形成し
ない場合である。The S pole face of the second permanent magnet 15 is attracted to one end 10c of the N-type yoke 12 to which the first permanent magnet 14 is not attracted. The magnetic pole surface of the N pole of the magnet 15 is attracted. An exciting coil 16 is wound around the outer periphery of the second permanent magnet 15 along an axis perpendicular to the attraction surface between the second permanent magnet 15 and the first yoke 10. A second yoke 17 is provided at the other end 10d of the first yoke 10 with a gap S2 therebetween. The gap of S2 becomes 0 because
When the excitation coil 16 is energized, the end face 10a of the first yoke 10
In the case of the N-type yoke 12, an N pole is generated, and in the case of the S-type yoke 13, an S pole is generated. A magnetic circuit is formed with the second yoke 20, and the second yoke 20 is attracted. [Figure 6]
(A)]. Here, the second yoke 20 is added as a separate component when the chuck body 2 or the tensioning body 3 does not form a magnetic circuit.
【0020】次に図3,図6にもとづき本発明の磁石構
造体4の作用について説明する。チャック本体2の中心
のテーパ穴2aにコレット7を嵌着し、緊定体3のテー
パ穴3aに係合させつつ緊定体3とチャック本体2との
係合部6で係合させる。緊定体3をチャック本体4に第
3永久磁石9で吸引されている。この段階では第1継鉄
10は励磁コイル16には通電されていないので第1継
鉄の端部10aには極性は表れていないので吸引力は作
用しない。図3及び図6において、第2継鉄20が示さ
れている。図6(a)(b)ではコレット7の図示は省
略されている。図1では緊定体3が、図2ではチャック
本体2が第2継鉄の機能を果たしている。Next, the operation of the magnet structure 4 of the present invention will be described with reference to FIGS. The collet 7 is fitted into the center tapered hole 2 a of the chuck body 2, and is engaged with the engaging portion 6 between the tightening body 3 and the chuck body 2 while engaging the taper hole 3 a of the tightening body 3. The tension member 3 is attracted to the chuck body 4 by the third permanent magnet 9. At this stage, since the first yoke 10 is not energized to the exciting coil 16, no polarity appears at the end 10 a of the first yoke, so that no attractive force acts. 3 and 6, the second yoke 20 is shown. 6 (a) and 6 (b), the illustration of the collet 7 is omitted. In FIG. 1, the tension body 3 functions as a second yoke, and in FIG. 2, the chuck body 2 functions as a second yoke.
【0021】図6(a)において、励磁コイル16に通
電される前は、N型継鉄12は第1永久磁石14と第2
永久磁石15と第1継鉄10との間で磁気回路が形成さ
れており、第1継鉄10の端面10dには極性を生じて
いない。図6(b)は、励磁コイル16に一定時間通電
し電流を遮断した状態を示している。In FIG. 6A, before the excitation coil 16 is energized, the N-type yoke 12 is connected to the first permanent magnet 14 and the second permanent magnet 14.
A magnetic circuit is formed between the permanent magnet 15 and the first yoke 10, and the end face 10d of the first yoke 10 has no polarity. FIG. 6B shows a state in which the excitation coil 16 is energized for a certain period of time to cut off the current.
【0022】図3において、図示しない給電用接触子に
給電リング19を接触させるようチャック1を移動し給
電させると、導線17を経由して励磁コイル16は励磁
される。図6(b)において励磁コイル16の端部は、
第2永久磁石15の極性と逆の極性を示すように励磁さ
れるので第1継鉄10は交互にN極,S極を示すように
なりN型継鉄12とS型継鉄13が形成される。その結
果、第1継鉄10と第2継鉄20は閉磁気回路を形成す
るようになり吸引作用が強く働くこととなる。In FIG. 3, when the chuck 1 is moved and supplied with power so that the power supply ring 19 is brought into contact with a power supply contact (not shown), the excitation coil 16 is excited via the conducting wire 17. In FIG. 6B, the end of the exciting coil 16 is
Since the first yoke 10 is excited so as to show the polarity opposite to the polarity of the second permanent magnet 15, the first yoke 10 shows the N pole and the S pole alternately, and the N-type yoke 12 and the S-type yoke 13 are formed. Is done. As a result, the first yoke 10 and the second yoke 20 form a closed magnetic circuit, and the attraction function is strongly exerted.
【0023】このようにチャック本体2と緊定体3が吸
引され,隙間S2が0になってコレット7は縮径し丸材
8を把持することとなる。このように通電を断っても磁
気回路は継続して維持される。次に再度通電すると図6
(b)で示す状態から図6(a)の状態になり第1継鉄
10の端部10bの極性は消失し第1継鉄10と第2継
鉄20とは離れる。As described above, the chuck body 2 and the tension member 3 are sucked, the gap S2 becomes zero, and the collet 7 is reduced in diameter and grips the round material 8. Thus, the magnetic circuit is continuously maintained even when the energization is stopped. Next, when power is supplied again, FIG.
The state shown in FIG. 6B changes to the state shown in FIG. 6A, the polarity of the end 10b of the first yoke 10 disappears, and the first yoke 10 and the second yoke 20 are separated.
【0024】〔実施例2〕図2は、本発明実施例2のチ
ャック11の断面図である。磁石構造体4が緊定体に設
けられている。図2に示すチャック11では、磁石構造
体4は緊定体3に設けられている。この点に基づく設計
上の変更以外は、図1に示すチャック1と構成は共通す
るので説明は省略する。Embodiment 2 FIG. 2 is a sectional view of a chuck 11 according to Embodiment 2 of the present invention. A magnet structure 4 is provided on the clamp. In the chuck 11 shown in FIG. 2, the magnet structure 4 is provided on the tension member 3. Except for the design change based on this point, the configuration is common to the chuck 1 shown in FIG.
【0025】図3は、チャック1の磁石構造体4を構成
に含む拡大断面図である。図3において、磁石構造体4
のN型継鉄12,S型継鉄13は図6にも例示するよう
に、チャックの中心に対し対称の位置に配列されてい
る。第1継鉄の10a部分に磁極を発生させるため励磁
コイル16に通電する。通電は絶縁体18で支持される
給電体19がチャック本体2のフランジ部2cに設けら
れている。給電体19に接続した導線17はチャック本
体2に穿孔した穴2cを通り励磁コイル16に接続され
ている。通電により第1継鉄10の端部10aにはN型
継鉄12にはN極が、S型継鉄にはS極が発生する。FIG. 3 is an enlarged sectional view of the structure of the chuck 1 including the magnet structure 4. In FIG. 3, the magnet structure 4
The N-type yoke 12 and the S-type yoke 13 are arranged at symmetrical positions with respect to the center of the chuck as illustrated in FIG. The excitation coil 16 is energized to generate a magnetic pole at the portion 10a of the first yoke. For power supply, a power supply 19 supported by an insulator 18 is provided on a flange 2 c of the chuck body 2. The conducting wire 17 connected to the power supply 19 is connected to the exciting coil 16 through a hole 2 c formed in the chuck body 2. The N-type yoke 12 has an N-pole at the end 10a of the first yoke 10 and an S-pole at the S-type yoke upon energization.
【0026】緊定体3の底面3bには緊定体3の材質が
非磁性体のときはリング状の第2継鉄17を特別に付加
して第1継鉄に発生した磁極と磁気回路を形成して緊定
体3を吸引し隙間S2を圧縮する。S2の隙間が圧縮さ
れることによりコレット7は縮径して被把持丸材8を外
径から均等に押圧して把持させる。図5に示すN型継鉄
とS型継鉄の配置図は実施例2に適用可能である。実施
例1で説明したのでここでは説明を省略する。図6に示
す磁石構造体の機能はすでに説明したので省略する。When the material of the tension member 3 is a non-magnetic material, a ring-shaped second yoke 17 is specially added to the bottom surface 3b of the tension member 3 so that a magnetic pole generated in the first yoke and a magnetic circuit are formed. Is formed to suck the tension member 3 and compress the gap S2. When the gap of S2 is compressed, the collet 7 is reduced in diameter, and the pressed round material 8 is evenly pressed from the outer diameter to be gripped. The arrangement diagram of the N-type yoke and the S-type yoke shown in FIG. 5 is applicable to the second embodiment. Since the description has been made in the first embodiment, the description is omitted here. The function of the magnet structure shown in FIG.
【0027】〔実施例3〕図4は本発明実施例3のチャ
ック21の主要部の断面図である。図4に示すチャック
21は、チャック本体2に磁石構造体4を設けているの
は図3のチャック1と共通する。コレット22は、テー
パ穴2aに対応する軸テーパ面で位置決めされ端面22
aが緊定体23と一体の押さえ板24の押さえ面24a
の端面と当接し軸方向に第3永久磁石9の吸引力で仮保
持されている。緊定体23の径方向は、チャック本体2
の外径面2eで緊定体23の内径面23aが案内されて
いる。緊定体23とチャック本体2との係合部6の関
係、緊定体23を第3永久磁石を作用させる関係、緊定
体23を磁石構造体4で強力に吸引する関係および第2
継鉄を付加する関係は図1に基づき説明した通りであ
る。図5に基づき実施例1で説明したN型継鉄とS型継
鉄の配置は共通する。図6に示す磁石構造体の機能はす
でに説明したので省略する。Third Embodiment FIG. 4 is a sectional view of a main part of a chuck 21 according to a third embodiment of the present invention. The chuck 21 shown in FIG. 4 is similar to the chuck 1 in FIG. 3 in that the magnet structure 4 is provided on the chuck body 2. The collet 22 is positioned at an axial tapered surface corresponding to the tapered hole 2a,
a is the holding surface 24a of the holding plate 24 integrated with the tension member 23
And is temporarily held in the axial direction by the attractive force of the third permanent magnet 9. The radial direction of the tension member 23 is the chuck body 2
The inner diameter surface 23a of the tensioning member 23 is guided by the outer diameter surface 2e. The relationship between the engaging portion 6 between the tension member 23 and the chuck body 2, the relationship between the tension member 23 and the third permanent magnet, the relationship between the tension member 23 being strongly attracted by the magnet structure 4, and the second relationship.
The relationship of adding the yoke is as described with reference to FIG. The arrangement of the N-type yoke and the S-type yoke described in the first embodiment with reference to FIG. 5 is common. The function of the magnet structure shown in FIG.
【0028】[0028]
【発明の効果】本発明の装置は上述のように構成されて
いるので次に記載する効果を奏する。丸材をチャックに
固定する場合に、まず、チャックのシャンク部を保持し
てねじを締めつける段取りが必要であり、シャンクの多
様化により段取りの準備と管理のための工数も必要とな
る。また締め付け工具の種類も増加し、管理も頻繁に成
りがちである。Since the apparatus according to the present invention is constructed as described above, the following effects can be obtained. When the round material is fixed to the chuck, first, a setup for holding the shank portion of the chuck and tightening the screws is necessary, and diversification of the shank requires preparation preparation and man-hours for management. In addition, types of tightening tools are increased, and management tends to be performed frequently.
【0029】本発明のチャックの使用により、丸材をチ
ャックへ取着するときに段取りを要せず、また締め付け
工具も必要でなくなる。また一定の工具把持力が得ら
れ、チャックの回転バランスも極めて良好となる。更に
繰り返し緊定精度に優れ、緊定作業上の労力・時間ロス
を減少させるのに有効である。磁石構造体の励磁コイル
への通電が常時通電でない点も経済性に優れている。By using the chuck of the present invention, no setup is required when the round material is attached to the chuck, and no tightening tool is required. In addition, a constant tool gripping force is obtained, and the rotation balance of the chuck is extremely good. Furthermore, it is excellent in repetitive tightening accuracy and is effective in reducing labor and time loss in the tightening operation. The fact that current is not always supplied to the excitation coil of the magnet structure is also economically advantageous.
【図1】本発明の実施例1に記載したチャックの断面図
である。コレットの案内面をチャック本体と緊定体の双
方に設け、チャック本体側に磁石構造体を設けた実施例
の図である。FIG. 1 is a cross-sectional view of a chuck described in Embodiment 1 of the present invention. FIG. 6 is a view of an embodiment in which a guide surface of a collet is provided on both the chuck body and the tightening body, and a magnet structure is provided on the chuck body side.
【図2】本発明の実施例2に記載したチャックの断面図
である。コレットの案内面をチャック本体と緊定体の双
方に設け、緊定体側に磁石構造体を設けた実施例の図で
ある。FIG. 2 is a cross-sectional view of a chuck described in Embodiment 2 of the present invention. FIG. 4 is a view of an embodiment in which a guide surface of a collet is provided on both the chuck body and the tightening body, and a magnet structure is provided on the tightening body side.
【図3】本発明のチャックの図1の磁石構造体拡大図で
ある。励磁コイルへの給電部、第3永久磁石による仮保
持部、チャック本体と緊定体の螺合部を含む図である。FIG. 3 is an enlarged view of the magnet structure of FIG. 1 of the chuck of the present invention. It is a figure including a power supply part to an excitation coil, a temporary holding part by the third permanent magnet, and a screwed part of the chuck body and the tightening body.
【図4】本発明の実施例3に記載したチャックの磁石構
造体拡大図である。チャック本体側に磁石構造体を設
け、緊定体が非帯磁性金属でありコレットの案内面がチ
ャック本体側にのみ設けられた図である。FIG. 4 is an enlarged view of a magnet structure of a chuck described in Embodiment 3 of the present invention. FIG. 4 is a diagram in which a magnet structure is provided on the chuck body side, the tensioning body is a non-magnetized metal, and a guide surface of a collet is provided only on the chuck body side.
【図5】本発明の磁石構造体におけるN型継鉄とS型継
鉄の配列図。実施例1乃至3に記載のチャックに適用さ
れる。(a)は方形配置の例、小径コレットに適用可、
(b)は円形配置の例、中径コレットに適用可、(c)
は方形配置の例、大径コレットに適用可。FIG. 5 is an arrangement diagram of an N-type yoke and an S-type yoke in the magnet structure of the present invention. This is applied to the chucks described in the first to third embodiments. (A) is an example of a square arrangement, applicable to small diameter collets,
(B) is an example of a circular arrangement, applicable to medium-diameter collets, (c)
Is a square arrangement, applicable to large diameter collets.
【図6】本発明を構成する磁石構造体の(a)は通電脱
磁と、(b)は通電着磁の場合の説明図。実施例1乃至
3に記載のチャックに適用される。(a)は励磁コイル
に第2永久磁石の磁性と同一の極性を生ずるように一時
通電した場合。第1継鉄と第2継鉄間に磁気回路は生じ
ない。(b)は励磁コイルに第2永久磁石の磁極と反対
の極性を生ずるように一時通電した場合の図である。な
お図6ではコレットは省略されている。FIGS. 6A and 6B are explanatory diagrams of a magnet structure constituting the present invention in the case of energization demagnetization, and FIG. This is applied to the chucks described in the first to third embodiments. (A) is a case in which the excitation coil is temporarily energized so as to have the same polarity as the magnetism of the second permanent magnet. There is no magnetic circuit between the first yoke and the second yoke. (B) is a diagram when the excitation coil is temporarily energized so as to generate a polarity opposite to the magnetic pole of the second permanent magnet. In FIG. 6, the collet is omitted.
1,11,21 チャック 2 チャック本体 3 緊定体 4 磁石構造体 5 仮保持部 6 係合部 7,22 コレット 8 丸材 9 第3永久磁石 10 第1継鉄 12 N型継鉄 13 S型継鉄 14 第1永久磁石 15 第2永久磁石 16 励磁コイル 17 導線 18 絶縁体 19 給電体 20 第2継鉄 23 押さえ板 DESCRIPTION OF SYMBOLS 1, 11, 21 Chuck 2 Chuck main body 3 Tension body 4 Magnet structure 5 Temporary holding part 6 Engaging part 7,22 Collet 8 Round material 9 Third permanent magnet 10 First yoke 12 N-type yoke 13 S-type yoke Iron 14 First permanent magnet 15 Second permanent magnet 16 Excitation coil 17 Conductor 18 Insulator 19 Feeder 20 Second yoke 23 Holding plate
Claims (6)
とも一端寄りに軸テーパを形成した縮径可能なコレット
と、該コレットを芯出しするチャック本体と緊定体の少
なくとも一方に前記軸テーパに対応するテーパ孔を設け
て該コレットを位置決めするコレット位置決め部材と、
前記チャック本体と緊定体のいずれか一方に励磁磁石を
設け励磁時に他方を吸着させて前記コレットを縮径する
コレット縮径部材を含んでなり、コレットの縮径により
丸材を把持するチャック。1. A collapsible collet having a hole for holding a round material at the center thereof and an axial taper formed at least at one end of an outer periphery thereof, and the axial taper provided on at least one of a chuck body and a tightening body for centering the collet. A collet positioning member for positioning the collet by providing a tapered hole corresponding to
A chuck comprising a collet reducing member for reducing the diameter of the collet by providing an exciting magnet on one of the chuck body and the tensioning body to attract the other during excitation and reducing the diameter of the collet.
本体または前記緊定体のいずれか一方の中心穴の外周に
その軸芯に対し対称かつ平行に一対以上設けた第1継鉄
の各側面に第1永久磁石のN極面を吸着させて形成した
N型継鉄と、前記第1継鉄の各側面に前記第1永久磁石
のS極面を吸着させて形成したS型継鉄と、前記N型継
鉄の一端には第2永久磁石のS極面を前記S型継鉄の一
端には第2永久磁石のN極面を吸着させて前記第2永久
磁石を同一端に揃えて前記N型継鉄と前記S型継鉄を交
互に配列し方形状または円形状に構成した磁石構造体
と、前記第2永久磁石のそれぞれの外周に通電用コイル
を巻回した励磁コイルと、該励磁コイルへの通電により
前記N型継鉄の前記第1継鉄の他端にN極を発生させ前
記S型継鉄の前記第1継鉄の他端にS極の磁極を発生さ
せ前記緊定体または前記ホルダ本体のいずれかを吸引し
て前記コレットを縮径させ、前記励磁コイルへの通電方
向を逆にして前記他端に発生したN極及びS極の磁極を
消失させて前記第2継鉄の吸引を解消して前記コレット
の径を回復するようにした請求項1に記載のチャック。2. A side face of a first yoke in which one or more pairs of said collet reducing members are provided symmetrically and parallel to the axis thereof around the center hole of one of said chuck body and said tightening body. An N-type yoke formed by adsorbing the N-pole surface of the first permanent magnet; and an S-type yoke formed by adsorbing the S-pole surface of the first permanent magnet on each side surface of the first yoke. The S pole face of the second permanent magnet is attracted to one end of the N-type yoke and the N pole face of the second permanent magnet is attracted to one end of the S-type yoke to align the second permanent magnet with the same end. A magnet structure in which the N-type yoke and the S-type yoke are alternately arranged to form a square or circular shape, and an exciting coil in which a current-carrying coil is wound around each outer periphery of the second permanent magnet. An N pole is generated at the other end of the first yoke of the N-type yoke by energizing the exciting coil, and the first type of the S-type yoke is generated. A magnetic pole of S pole is generated at the other end of the yoke, and the collet is contracted by sucking either the tightening body or the holder body, and the direction of current supply to the exciting coil is reversed to the other end. The chuck according to claim 1, wherein the generated magnetic poles of the N pole and the S pole are eliminated to eliminate the suction of the second yoke and recover the diameter of the collet.
てなる請求項2に記載のチャック。3. The chuck according to claim 2, wherein a cross section of the first yoke is formed in a square shape.
てなる請求項2記載のチャック。4. The chuck according to claim 2, wherein the cross section of the first yoke is formed in a fan shape.
トを縮径させる前に、装着後の前記チャック本体と前記
緊定体間で磁力を作用させるよう前記緊定体または前記
チャック本体の少なくとも一方に第3永久磁石を設けて
なる請求項1または2に記載のチャック。5. Before the energizing magnet coil is energized to reduce the diameter of the collet, at least one of the tensioning body or the chuck body is configured to apply a magnetic force between the attached chuck body and the tensioning body. 3. The chuck according to claim 1, wherein a third permanent magnet is provided on one side.
前記第3永久磁石による磁力を作用させる前に、前記チ
ャック本体と前記緊定体とを係合させる螺合またはバイ
ヨネット結合の係合部を設けてなり、該係合部脱出後に
前記チャック本体の軸芯方向に移動して該チャック本体
と前記緊定体とを吸引させる請求項3に記載のチャッ
ク。6. A screw or bayonet connection for engaging the chuck body and the tension member before applying a magnetic force by the third permanent magnet between the tension member and the chuck body. The chuck according to claim 3, further comprising a joining portion, wherein the chuck body moves in the axial direction of the chuck main body after the engagement portion escapes to suck the chuck main body and the tension member.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000153131A JP2001328014A (en) | 2000-05-24 | 2000-05-24 | Chuck |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000153131A JP2001328014A (en) | 2000-05-24 | 2000-05-24 | Chuck |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2001328014A true JP2001328014A (en) | 2001-11-27 |
Family
ID=18658451
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2000153131A Pending JP2001328014A (en) | 2000-05-24 | 2000-05-24 | Chuck |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2001328014A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008188731A (en) * | 2007-02-06 | 2008-08-21 | Koganei Corp | Chuck |
JP2015223656A (en) * | 2014-05-27 | 2015-12-14 | ファナック株式会社 | Tool gripping mechanism |
JP2019084635A (en) * | 2017-11-08 | 2019-06-06 | 株式会社Fuji | Chuck device |
US20220056951A1 (en) * | 2020-08-20 | 2022-02-24 | Zippy Robotics, Inc. | High-speed, low runout spindle assembly |
-
2000
- 2000-05-24 JP JP2000153131A patent/JP2001328014A/en active Pending
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008188731A (en) * | 2007-02-06 | 2008-08-21 | Koganei Corp | Chuck |
JP2015223656A (en) * | 2014-05-27 | 2015-12-14 | ファナック株式会社 | Tool gripping mechanism |
US9849551B2 (en) | 2014-05-27 | 2017-12-26 | Fanuc Corporation | Tool gripping mechanism |
JP2019084635A (en) * | 2017-11-08 | 2019-06-06 | 株式会社Fuji | Chuck device |
JP7015149B2 (en) | 2017-11-08 | 2022-02-02 | 株式会社Fuji | Chuck device |
US20220056951A1 (en) * | 2020-08-20 | 2022-02-24 | Zippy Robotics, Inc. | High-speed, low runout spindle assembly |
US11931848B2 (en) * | 2020-08-20 | 2024-03-19 | Zippy Robotics, Inc. | High-speed, low runout spindle assembly |
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