JP4273377B2 - Drill chuck and chuck device - Google Patents

Drill chuck and chuck device Download PDF

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JP4273377B2
JP4273377B2 JP29352499A JP29352499A JP4273377B2 JP 4273377 B2 JP4273377 B2 JP 4273377B2 JP 29352499 A JP29352499 A JP 29352499A JP 29352499 A JP29352499 A JP 29352499A JP 4273377 B2 JP4273377 B2 JP 4273377B2
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peripheral surface
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JP2001113403A (en
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愃 田島
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株式会社ツガミツール
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【０００１】
【発明の属する技術分野】
本発明は例えば自動旋盤やフライス盤等の工作機械に用いられるドリルチャック及びチャック装置に関するものである。
【０００２】
【従来の技術】
従来この種のドリルチャックとして、工作機械の主軸の先端部に装着される支持部材内にコレット部材を内装し、このコレット部材は両端部にそれぞれ先細りのテーパー面が形成されていると共に複数個の割溝がすり割り溝が形成され、軸線方向の進退動作により半径方向に拡縮径動作してドリルを把持釈放可能に形成され、該支持部材の先端部外周面に形成された雄螺子部に締付弛緩回動によりコレット部材を進退動作させるチャックナットの雌螺子部を螺着して構成したものが知られている。
【０００３】
【発明が解決しようとする課題】
しかしながらこれら従来構造の場合、上記支持部材の先端部外周面に形成された雄螺子部及びチャックナットの内周面に形成された雌螺子部はいずれもネジ研削加工がなされ、ネジ研削加工により支持部材の軸線とチャックナットの軸線との同軸度を確保し、コレットチャックの把持精度及び把持力を高める構造になっており、このネジ研削加工は一般の旋削加工に比べて加工が厄介であると共に高度の熟練を必要とするため、製作コストの低減を図ることができないという不都合を有している。
【０００４】
【課題を解決するための手段】
本発明はこれら課題を解決することを目的とするもので、本発明のうちで、請求項１記載の発明は、工作機械の主軸の先端部に装着保持される支持部材と、支持部材の先端部に装着されるコレット部材と、支持部材の先端部外周面に形成された雄螺子部に螺着可能な雌螺子部が形成され、コレット部材を支持部材に保持すると共にコレット部材を軸線方向に押込動作させ、コレット部材を縮径動作させるチャックナットとを備えてなり、上記コレット部材は上記支持部材の先端部に装着される保持部材と、該保持部材に割溝間隙を存して放射状に環状配置され、該チャックナットの締付回動により半径方向に縮径動作してドリルを把持可能な複数個のコレット爪とからなり、上記支持部材の外周面に位置規正外周面を形成すると共にチャックナットの内周面に該位置規正外周面に密嵌して支持部材とコレット爪との相対位置を規正する位置規正内周面を形成してなることを特徴とするドリルチャックにある。
【０００５】
又、請求項２記載の発明は、上記支持部材の外周面の雄螺子部の前後位置に位置規正外周面を形成すると共にチャックナットの内周面の雌螺子部の前後位置に該位置規正外周面に密嵌して支持部材とコレット爪との相対位置を規正する位置規正内周面を形成してなることを特徴とするものであり、又、請求項３記載の発明は、上記保持部材を上記支持部材の装着穴に嵌合可能な筒状に形成し、該保持部材の内周面に複数個のコレット爪の基部を遊動状態に止着してなることを特徴とするものであり、又、請求項４記載の発明は、上記コレット爪の中央外周部に環状凸部を形成し、該環状凸部の外周面に先広がりのテーパー外周面を形成し、上記支持部材の先端部内周面にテーパー外周面に摺動嵌合可能なテーパー内周面を形成し、該コレット爪の環状凸部の前段面に当接可能な内段面をチャックナットに形成してなることを特徴とするものである。
【０００６】
又、請求項５記載の発明は、工作機械の主軸の先端部に支持部材を装着保持し、該支持部材の先端部に保持部材により割溝間隙を存して放射状に環状配置され、軸線方向の押込動作により半径方向に縮径動作してドリルを把持可能な複数個のコレット爪からなるコレット部材を装着し、支持部材の先端部外周面に形成された雄螺子部に締付回動によりコレット爪を押込動作させるチャックナットの雌螺子部を螺着し、支持部材の外周面に位置規正外周面を形成すると共にチャックナットの内周面に該位置規正外周面に密嵌して支持部材とコレット爪との相対位置を規正する位置規正内周面を形成してなることを特徴とするチャック装置にある。
【０００７】
又、請求項６記載の発明は、上記支持部材の外周面の雄螺子部の前後位置に位置規正外周面を形成すると共にチャックナットの内周面の雌螺子部の前後位置に該位置規正外周面に密嵌して支持部材とコレット爪との相対位置を規正する位置規正内周面を形成してなることを特徴とするものであり、又、請求項７記載の発明は、上記保持部材を上記支持部材の装着穴に嵌合可能な筒状に形成し、該保持部材の内周面に複数個のコレット爪の基部を遊動状態に止着してなることを特徴とするものである。
【０００８】
【発明の実施の形態】
図１乃至図７は本発明の実施の形態例を示し、図１乃至図６は第一形態例、図７は第二形態例である。
【０００９】
図１乃至図６の第一形態例において、１は主軸であって、図示省略の工作機械に回転駆動自在に横設され、この筒状の主軸１の先端部に支持部材２を装着し、支持部材２の先端部にコレット部材３を装着し、支持部材２の先端部外周面に雄螺子部２ａを形成し、雄螺子部２ａにチャックナット４の雌螺子部４ａを螺着し、コレット部材３を支持部材２に保持すると共にコレット部材３を軸線方向に押込動作させ、コレット部材３を縮径動作させるように構成している。
【００１０】
このコレット部材３は、上記支持部材２の先端部の装着穴２ｂに装着される保持部材５と、保持部材５に割溝間隙Ｒを存して放射状に環状配置され、チャックナット４の締付回動により軸線方向に押込動作して半径方向に縮径動作し、ドリルＷを把持釈放可能な三個のコレット爪３ａ・３ａ・３ａとからなり、上記支持部材２の外周面の雄螺子部２ａの前後位置に主軸１に対しての同軸度を高めた位置規正外周面６・６を形成すると共に上記チャックナット４の内周面の雌螺子部４ａの前後位置に位置規正外周面６・６に密嵌して支持部材２とコレット爪３との相対位置を規正する、支持部材２に対しての同軸度を高めた位置規正内周面７・７を形成して構成している。尚、位置規正外周面６・６及び位置規正内周面７・７は前後二カ所位置でなくて一ケ所又はその他複数箇所に形成することもある。
【００１１】
この場合三個のコレット爪３ａ・３ａ・３ａの中央外周部に環状凸部３ｂを形成し、環状凸部３ｂの外周面に先広がりのテーパー外周面３ｃを形成し、支持部材２の先端部内周面にテーパー外周面３ｃに摺動嵌合可能なテーパー内周面２ｃを形成し、チャックナット４の内段面４ｂによりコレット爪３ａ・３ａ・３ａの環状凸部３ｂの前段面３ｄを当接可能に形成し、チャックナット４の前部に内穴面４ｃを形成し、筒状の保持部材５に三個の螺子穴５ａ・５ａ・５ａを形成すると共にレンチ挿通穴５ｂ・５ｂ・５ｂを形成し、コレット爪３ａ・３ａ・３ａに遊挿溝３ｅ・３ｅ・３ｅを形成すると共に止着穴３ｆ・３ｆ・３ｆを形成し、螺子穴５ａ・５ａ・５ａにレンチ挿通穴５ｂ・５ｂ・５ｂ及び遊挿溝３ｅ・３ｅ・３ｅより図示省略の六角棒レンチを挿通して止着穴３ｆ・３ｆ・３ｆを介して止めボルト８・８・８を挿通して保持部材５の内周面に複数個のコレット爪３ａ・３ａ・３ａの基部を遊動状態に止着し、チャックナット４の締付回動によりテーパー外周面３ｃとテーパー内周面２ｃとの摺動嵌合により軸線方向に押込動作しつつ半径方向に縮径動作してドリルＷを把持可能に構成している。
【００１２】
又、この場合、チャックナット４に回動用穴４ｄを複数個形成し、図示省略の手回し工具のピンを回動用孔４ｄに差し込んで回動することによりコレット部材３の着脱交換を行うことができ、ナット部材の外周面にスパナ等を掛けて回す構造に比べて、周囲の配置スペースを確保できるように構成している。
【００１３】
この実施の第一形態例は上記構成であるから、図６の如く、支持部材２の装着穴２ｂにコレット部材３を装着し、チャックナット４の内周面の雌螺子部４ａを支持部材２の先端部外周面の雄螺子部２ａに螺着し、コレット部材３の前段面３ｄにチャックナット４の内段面４ｂを当接し、チャックナット４の更なる締付回動によりコレット部材３を図中左方向に押動すると、テーパー外周面３ｃとテーパー内周面２ｃとの摺動嵌合によりコレット爪３ａ・３ａ・３ａは、図１の如く、半径方向に縮径動作し、これによりドリルＷをコレット爪３ａ・３ａ・３ａにより把持することになり、又、図１の把持状態において、チャックナット４を弛緩回動すると、テーパー外周面３ｃとテーパー内周面２ｃとの摺動嵌合によりコレット爪３ａ・３ａ・３ａは、半径方向に拡径動作可能となり、これによりドリルＷをコレット爪３ａ・３ａ・３ａにより釈放することになる。
【００１４】
この際、上記支持部材２の外周面に位置規正外周面６を形成すると共にチャックナット４の内周面に該位置規正外周面６に密嵌して支持部材２とコレット爪３ａ・３ａ・３ａとの相対位置を規正する位置規正内周面７を形成してなるから、位置規正外周面６と位置規正内周面７との密嵌時において、支持部材２の軸線とチャックナット４の軸線との同軸度を確保することができ、ひいては、支持部材２とコレット爪３ａ・３ａ・３ａとの相対位置としての同軸度が確保され、このため、支持部材２の先端部外周面の雄螺子部２ａ及びチャックナット４の内周面の雌螺子部４ａのネジ研削加工を不要とすることができ、汎用のねじ切り加工により製作することができ、それだけ高度の熟練を要せずに容易に製作することができ、製作コストの低減を図ることができる。
【００１５】
又、この場合、上記支持部材２の外周面の雄螺子部２ａの前後位置に位置規正外周面６を形成すると共にチャックナット４の内周面の雌螺子部４ａの前後位置に該位置規正外周面６に密嵌して支持部材２とコレット爪３ａ・３ａ・３ａとの相対位置を規正する位置規正内周面７を形成してなるから、前後位置の位置規正外周面６・６と前後位置の位置規正内周面７・７との嵌合により支持部材２の軸線とチャックナット４の軸線との同軸度を一層良好に確保することができ、又、この場合、保持部材５を上記支持部材２の装着穴２ａに嵌合可能な筒状に形成し、保持部材５の内周面に複数個のコレット爪３ａ・３ａ・３ａの基部を遊動状態に止着してなるから、コレット爪３ａ・３ａ・３ａの縮径動作を容易に行うことができ、又、この場合、上記コレット爪３ａの中央外周部に環状凸部３ｂを形成し、環状凸部３ｂの外周面に先広がりのテーパー外周面３ｃを形成し、上記支持部材２の先端部内周面にテーパー外周面３ｃに摺動嵌合可能なテーパー内周面２ｃを形成し、コレット爪３ａ・３ａ・３ａの環状凸部３ｂの前段面３ｄに当接可能な内段面４ｃをチャックナット４に形成してなるから、チャックナット４の締付回動により容易にコレット爪３ａ・３ａ・３ａを押込動作させることができ、コレット爪３ａ・３ａ・３ａの縮径動作を容易に行うことができる。
【００１６】
又、この場合、コレット部材３と保持部材５とを別途に製作することができ、それぞれ異なった熱処理や表面硬化処理等の処理加工を行うことができ、製作が容易となり、製作コストの低減及び保管の利便性を図ることができる。
【００１７】
又、この場合、チャックナット４に回動用穴４ｄを複数個形成し、図示省略の手回し工具のピンを回動用孔４ｄに差し込んで回動することによりコレット部材３の着脱交換を行うことができ、ナット部材の外周面にスパナ等を掛けて回す構造に比べて、周囲の配置スペースを確保でき、それだけスペースの有効利用を図ることができる。
【００１８】
図７の実施の第二形態例は別例構造であって、この場合、支持部材２の外径とチャックナット４の外径を同一外径に設定し、これにより一層小型化を図るようにしている。
【００１９】
この第二形態例にあっても、上記第一形態例と同様な作用効果を得ることができると共に小型化を図ることができる。
【００２０】
尚、本発明は上記実施の形態例に限られるものではなく、支持部材２、コレット部材３、チャックナット４等の構造や形態並びに数等は適宜設計して変更される。
【００２１】
【発明の効果】
本発明は上述の如く、請求項１又は５記載の発明にあっては、支持部材の外周面に位置規正外周面を形成すると共にチャックナットの内周面に該位置規正外周面に密嵌して支持部材とコレット爪との相対位置を規正する位置規正内周面を形成してなるから、位置規正外周面と位置規正内周面との密嵌時において、支持部材の軸線とチャックナットの軸線との同軸度を確保することができ、ひいては、支持部材とコレット爪との相対位置としての同軸度が確保され、このため、支持部材の先端部外周面の雄螺子部及びチャックナットの内周面の雌螺子部のネジ研削加工を不要とすることができ、汎用のねじ切り加工により製作することができ、それだけ高度の熟練を要せずに容易に製作することができ、製作コストの低減を図ることができる。
【００２２】
又、請求項２又は６記載の発明にあっては、上記支持部材の外周面の雄螺子部の前後位置に位置規正外周面を形成すると共にチャックナットの内周面の雌螺子部の前後位置に該位置規正外周面に密嵌して支持部材とコレット爪との相対位置を規正する位置規正内周面を形成してなるから、前後位置の位置規正外周面と前後位置の位置規正内周面との嵌合により支持部材の軸線とチャックナットの軸線との同軸度を一層良好に確保することができ、請求項３又は７記載の発明にあっては、上記保持部材を上記支持部材の装着穴に嵌合可能な筒状に形成し、保持部材の内周面に複数個のコレット爪の基部を遊動状態に止着してなるから、コレット爪の縮径動作を容易に行うことができ、又、請求項４記載の発明にあっては、上記コレット爪の中央外周部に環状凸部を形成し、環状凸部の外周面に先広がりのテーパー外周面を形成し、上記支持部材の先端部内周面にテーパー外周面に摺動嵌合可能なテーパー内周面を形成し、コレット爪の環状凸部の前段面に当接可能な内段面をチャックナットに形成してなるから、チャックナットの締付回動により容易にコレット爪を押込動作させることができ、コレット爪の縮径動作を容易に行うことができる。
【００２３】
以上の如く、所期の目的を充分達成することができる。
【図面の簡単な説明】
【図１】本発明の実施の第一形態例の断面図である。
【図２】本発明の実施の第一形態例の側面図である。
【図３】本発明の実施の第一形態例の横断面図である。
【図４】本発明の実施の第一形態例の分解斜視図である。
【図５】本発明の実施の第一形態例の斜視図である。
【図６】本発明の実施の第一形態例の部分断面図である。
【図７】本発明の実施の第二形態例の断面図である。
【符号の説明】
Ｗ ドリル
Ｒ 割溝間隙
１ 主軸
２ 支持部材
２ａ 雄螺子部
３ コレット部材
３ａ コレット爪
４ チャックナット
４ａ 雌螺子部
５ 保持部材
６ 位置規正外周面
７ 位置規正内周面[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drill chuck and a chuck device used for a machine tool such as an automatic lathe or a milling machine.
[0002]
[Prior art]
Conventionally, as this type of drill chuck, a collet member is internally provided in a support member attached to the tip of a spindle of a machine tool, and the collet member has a tapered surface formed at each end and a plurality of taper surfaces. The split groove is formed into a slit groove, and is formed so that the drill can be gripped and released by moving in the radial direction by advancing and retracting in the axial direction, and is tightened to the male screw portion formed on the outer peripheral surface of the distal end portion of the support member. There is known a structure in which a female screw portion of a chuck nut that moves a collet member forward and backward by attaching and rotating is screwed.
[0003]
[Problems to be solved by the invention]
However, in the case of these conventional structures, both the male screw portion formed on the outer peripheral surface of the tip end portion of the support member and the female screw portion formed on the inner peripheral surface of the chuck nut are subjected to screw grinding, and are supported by screw grinding. It is structured to ensure the coaxiality between the axis of the member and the axis of the chuck nut, and to increase the gripping accuracy and gripping force of the collet chuck, and this thread grinding is more troublesome than general turning. Since a high level of skill is required, the manufacturing cost cannot be reduced.
[0004]
[Means for Solving the Problems]
SUMMARY OF THE INVENTION The present invention aims to solve these problems. Among the present inventions, the invention according to claim 1 is a support member that is mounted and held at the tip of the spindle of the machine tool, and the tip of the support member. A collet member to be mounted on the support portion and a female screw portion that can be screwed to a male screw portion formed on the outer peripheral surface of the front end portion of the support member. The collet member is held by the support member and the collet member is axially A chuck nut that pushes the collet member to reduce the diameter of the collet member, and the collet member is radially provided with a holding member attached to a distal end portion of the support member and a gap between the holding members. A plurality of collet claws that are annularly arranged and radially contracted by tightening rotation of the chuck nut to grip a drill, and form a position-regulating outer peripheral surface on the outer peripheral surface of the support member Chuck In the drill chuck, characterized in that by forming a position regulating inner circumferential surface of the inner peripheral surface of Tsu bets for regulating the relative position between and closely fitted to the position regulating outer peripheral surface support member and a collet claw.
[0005]
According to a second aspect of the present invention, a position-regulating outer peripheral surface is formed at the front and rear positions of the male screw portion on the outer peripheral surface of the support member, and the position-regulating outer periphery is disposed at the front and rear positions of the female screw portion on the inner peripheral surface of the chuck nut. A position regulating inner peripheral surface that regulates a relative position between the support member and the collet claw by being closely fitted to the surface is formed, and the invention according to claim 3 is characterized in that the holding member is Is formed in a cylindrical shape that can be fitted into the mounting hole of the support member, and a base of a plurality of collet claws is fixed to the inner peripheral surface of the holding member in a floating state. According to a fourth aspect of the present invention, an annular convex portion is formed on a central outer peripheral portion of the collet claw, a tapered outer peripheral surface is formed on the outer peripheral surface of the annular convex portion, A tapered inner peripheral surface that can be slidably fitted to the tapered outer peripheral surface is formed on the peripheral surface, and the collet The inner step surface capable of contacting the front surface of the annular projection and is characterized in that obtained by forming the chuck nut.
[0006]
According to the fifth aspect of the present invention, a supporting member is mounted and held at the tip of the spindle of the machine tool, and the tip of the supporting member is radially arranged with a split groove gap by the holding member. A collet member made up of a plurality of collet claws capable of gripping a drill by reducing the diameter in the radial direction by the pushing operation is attached to the male screw portion formed on the outer peripheral surface of the distal end portion of the support member by tightening rotation. A female screw portion of a chuck nut that pushes the collet claw is screwed, and a position regulating outer peripheral surface is formed on the outer peripheral surface of the support member, and the position regulating outer peripheral surface of the chuck nut is closely fitted to the position regulating outer peripheral surface. The chuck device is characterized by forming a position-regulating inner peripheral surface that regulates a relative position between the pin and the collet claw.
[0007]
According to a sixth aspect of the present invention, a position-regulating outer peripheral surface is formed at the front and rear positions of the male screw portion on the outer peripheral surface of the support member, and the position-regulating outer periphery is disposed at the front and rear positions of the female screw portion on the inner peripheral surface of the chuck nut. A position regulating inner peripheral surface is formed which is tightly fitted to the surface and regulates the relative position between the support member and the collet claw. The invention according to claim 7 is characterized in that the holding member is Is formed in a cylindrical shape that can be fitted into the mounting hole of the support member, and a base of a plurality of collet claws is fixed to the inner peripheral surface of the holding member in a floating state. .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
1 to 7 show an embodiment of the present invention, FIGS. 1 to 6 show a first embodiment, and FIG. 7 shows a second embodiment.
[0009]
In the first embodiment shown in FIGS. 1 to 6, reference numeral 1 denotes a main shaft, which is horizontally disposed on a machine tool (not shown) so as to be freely rotatable. A support member 2 is attached to the tip of the cylindrical main shaft 1, A collet member 3 is attached to the distal end portion of the support member 2, a male screw portion 2a is formed on the outer peripheral surface of the distal end portion of the support member 2, and a female screw portion 4a of the chuck nut 4 is screwed to the male screw portion 2a. While the member 3 is held by the support member 2, the collet member 3 is pushed in the axial direction, and the collet member 3 is reduced in diameter.
[0010]
The collet member 3 is radially disposed in the holding member 5 mounted in the mounting hole 2b at the tip end portion of the support member 2 and the holding member 5 with a split groove gap R, and the chuck nut 4 is tightened. It consists of three collet claws 3a, 3a, 3a that can push and move in the axial direction by rotation and reduce the diameter in the radial direction, and can hold and release the drill W. The male screw portion on the outer peripheral surface of the support member 2 Position regulating outer circumferential surfaces 6 and 6 having increased coaxiality with respect to the main shaft 1 are formed at the front and rear positions of 2a, and the position regulating outer circumferential surfaces 6 and 6 are disposed at the front and rear positions of the female screw portion 4a on the inner circumferential surface of the chuck nut 4. 6 is formed so as to form a position-regulating inner peripheral surface 7, 7 that is closely fitted to 6 and regulates the relative position between the support member 2 and the collet claw 3 and has a high degree of coaxiality with respect to the support member 2. The position regulating outer peripheral surfaces 6 and 6 and the position regulating inner circumferential surfaces 7 and 7 may be formed at one place or a plurality of other places instead of the two front and rear positions.
[0011]
In this case, an annular convex portion 3b is formed on the central outer peripheral portion of the three collet claws 3a, 3a, 3a, and a tapered outer peripheral surface 3c is formed on the outer peripheral surface of the annular convex portion 3b. A tapered inner peripheral surface 2c that can be slidably fitted to the tapered outer peripheral surface 3c is formed on the peripheral surface, and the front step surface 3d of the annular projection 3b of the collet claw 3a, 3a, 3a is abutted by the inner step surface 4b of the chuck nut 4. An inner hole surface 4c is formed at the front portion of the chuck nut 4, three screw holes 5a, 5a, and 5a are formed in the cylindrical holding member 5, and wrench insertion holes 5b, 5b, and 5b are formed. Are formed in the collet claws 3a, 3a, 3a, and the fixing holes 3f, 3f, 3f are formed, and the wrench insertion holes 5b, 5b are formed in the screw holes 5a, 5a, 5a.・ Six illustrations omitted from 5b and loose insertion grooves 3e, 3e Insert a bar wrench and insert the set bolts 8, 8, 8 through the fixing holes 3 f, 3 f, 3 f, and loosely move the bases of the plurality of collet claws 3 a, 3 a, 3 a on the inner peripheral surface of the holding member 5. The drill W is fixed in the state, and the diameter of the drill W is reduced in the radial direction while pushing in the axial direction by sliding fitting between the tapered outer peripheral surface 3c and the tapered inner peripheral surface 2c by the tightening rotation of the chuck nut 4. It is configured to be grippable.
[0012]
Further, in this case, the collet member 3 can be attached and detached by forming a plurality of turning holes 4d in the chuck nut 4 and inserting a turning tool pin (not shown) into the turning hole 4d to turn. Compared to a structure in which a nut or the like is applied to the outer peripheral surface of the nut member, the surrounding arrangement space can be secured.
[0013]
Since the first embodiment of the present embodiment is configured as described above, the collet member 3 is mounted in the mounting hole 2b of the support member 2 and the female screw portion 4a on the inner peripheral surface of the chuck nut 4 is connected to the support member 2 as shown in FIG. The collet member 3 is screwed to the male screw portion 2 a on the outer peripheral surface of the tip portion, the inner step surface 4 b of the chuck nut 4 is brought into contact with the front step surface 3 d of the collet member 3, and the collet member 3 is moved by further tightening rotation of the chuck nut 4. When it is pushed in the left direction in the figure, the collet claws 3a, 3a, 3a are contracted radially in the radial direction as shown in FIG. 1 due to the sliding fit between the taper outer peripheral surface 3c and the taper inner peripheral surface 2c. When the drill W is gripped by the collet claws 3a, 3a, 3a, and the chuck nut 4 is rotated loosely in the gripping state of FIG. 1, the taper outer peripheral surface 3c and the taper inner peripheral surface 2c are slidably fitted. Collet nails 3a, 3a, a is made possible expanded operation radially, so that thereby release the drill W by collet claw 3a · 3a · 3a.
[0014]
At this time, the position adjusting outer peripheral surface 6 is formed on the outer peripheral surface of the support member 2 and the position adjusting outer peripheral surface 6 is closely fitted to the inner peripheral surface of the chuck nut 4 so as to support the support member 2 and the collet claws 3a, 3a, 3a. And the axial line of the support member 2 and the chuck nut 4 when the position-regulating outer peripheral surface 6 and the position-regulating inner peripheral surface 7 are closely fitted. As a result, the coaxiality as a relative position between the support member 2 and the collet claws 3a, 3a, and 3a is ensured. Therefore, the male screw on the outer peripheral surface of the front end portion of the support member 2 is secured. It is possible to eliminate the need for thread grinding of the female threaded portion 4a on the inner peripheral surface of the portion 2a and the chuck nut 4, and it can be manufactured by general-purpose threading, and can be easily manufactured without requiring high skill. Can be produced at low cost It can be achieved.
[0015]
Further, in this case, the position regulating outer peripheral surface 6 is formed at the front and rear positions of the male screw portion 2 a on the outer peripheral surface of the support member 2, and the position regulating outer periphery is provided at the front and rear positions of the female screw portion 4 a on the inner peripheral surface of the chuck nut 4. The position regulating inner peripheral surface 7 is formed by tightly fitting to the surface 6 to regulate the relative position between the support member 2 and the collet claws 3a, 3a, 3a. The coaxiality between the axis of the support member 2 and the axis of the chuck nut 4 can be further ensured by fitting with the position regulating inner peripheral surfaces 7 and 7, and in this case, the holding member 5 can be The collet is formed in a cylindrical shape that can be fitted into the mounting hole 2a of the support member 2, and the base portions of the plurality of collet claws 3a, 3a, 3a are fixed to the inner peripheral surface of the holding member 5 in a floating state. The diameter of the claws 3a, 3a, 3a can be easily reduced, and in this case An annular convex portion 3b is formed on the central outer peripheral portion of the collet claw 3a, a tapered outer peripheral surface 3c is formed on the outer peripheral surface of the annular convex portion 3b, and a tapered outer peripheral surface 3c is formed on the inner peripheral surface of the distal end portion of the support member 2. A taper inner peripheral surface 2c that can be slidably fitted to the chuck nut 4 is formed, and an inner step surface 4c that can contact the front step surface 3d of the annular projection 3b of the collet claws 3a, 3a, 3a is formed on the chuck nut 4. Therefore, the collet claws 3a, 3a, 3a can be easily pushed by the tightening rotation of the chuck nut 4, and the diameter reducing operation of the collet claws 3a, 3a, 3a can be easily performed.
[0016]
Further, in this case, the collet member 3 and the holding member 5 can be manufactured separately, and processing such as different heat treatments and surface hardening treatments can be performed, making the manufacture easy, reducing the manufacturing cost, and Convenient storage can be achieved.
[0017]
Further, in this case, the collet member 3 can be attached and detached by forming a plurality of turning holes 4d in the chuck nut 4 and inserting a turning tool pin (not shown) into the turning hole 4d to turn. Compared to the structure in which the outer circumferential surface of the nut member is rotated with a spanner or the like, the surrounding arrangement space can be secured, and the space can be used effectively.
[0018]
The second embodiment shown in FIG. 7 has another structure. In this case, the outer diameter of the support member 2 and the outer diameter of the chuck nut 4 are set to the same outer diameter, thereby further reducing the size. ing.
[0019]
Even in the second embodiment, it is possible to obtain the same effect as the first embodiment and to reduce the size.
[0020]
The present invention is not limited to the above embodiment, and the structure, form, number, and the like of the support member 2, the collet member 3, the chuck nut 4 and the like are appropriately designed and changed.
[0021]
【The invention's effect】
As described above, according to the present invention, the position regulating outer peripheral surface is formed on the outer circumferential surface of the support member, and the position regulating outer circumferential surface is closely fitted to the inner circumferential surface of the chuck nut. In this case, the position regulating inner circumferential surface for regulating the relative position between the support member and the collet claw is formed. Therefore, when the position regulating outer circumferential surface and the position regulating inner circumferential surface are closely fitted, the axis of the supporting member and the chuck nut The coaxiality with the axis can be ensured, and as a result, the coaxiality as the relative position between the support member and the collet claw is secured. Thread grinding of the female thread on the peripheral surface can be eliminated, and it can be manufactured by general-purpose threading, and it can be easily manufactured without requiring a high level of skill, reducing manufacturing costs. Can be achieved.
[0022]
In the invention according to claim 2 or 6, the position-regulating outer peripheral surface is formed at the front and rear positions of the male screw portion on the outer peripheral surface of the support member, and the front and rear positions of the female screw portion on the inner peripheral surface of the chuck nut The position regulation inner peripheral surface for tightly fitting to the position regulation outer peripheral surface to regulate the relative position between the support member and the collet claw is formed, so that the position regulation outer circumferential surface at the front and rear positions and the position regulation inner circumference at the front and rear positions are formed. The coaxiality between the axis of the support member and the axis of the chuck nut can be further ensured by fitting with the surface. In the invention according to claim 3 or 7, the holding member is attached to the support member. It is formed in a cylindrical shape that can be fitted into the mounting hole, and the base of the plurality of collet claws is fixed to the inner peripheral surface of the holding member in a floating state, so that the collet claw can be easily reduced in diameter. In the invention according to claim 4, the center of the collet claw A tapered inner peripheral surface that forms an annular convex portion on the peripheral portion, forms a tapered outer peripheral surface that widens forward on the outer peripheral surface of the annular convex portion, and can be slidably fitted to the tapered outer peripheral surface on the inner peripheral surface of the tip portion of the support member. Since the chuck nut is formed with an inner step surface that can contact the front step surface of the annular convex part of the collet claw, the collet claw can be easily pushed in by tightening and rotating the chuck nut. The collet claw can be easily reduced in diameter.
[0023]
As described above, the intended purpose can be sufficiently achieved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a first embodiment of the present invention.
FIG. 2 is a side view of the first embodiment of the present invention.
FIG. 3 is a cross-sectional view of a first embodiment of the present invention.
FIG. 4 is an exploded perspective view of a first embodiment of the present invention.
FIG. 5 is a perspective view of a first embodiment of the present invention.
FIG. 6 is a partial sectional view of a first embodiment of the present invention.
FIG. 7 is a cross-sectional view of a second embodiment of the present invention.
[Explanation of symbols]
W Drill R Split groove clearance 1 Main shaft 2 Support member 2a Male screw part 3 Collet member 3a Collet claw 4 Chuck nut 4a Female screw part 5 Holding member 6 Position regulating outer peripheral surface 7 Position regulating inner peripheral surface

Claims (7)

工作機械の主軸の先端部に装着保持される支持部材と、支持部材の先端部に装着されるコレット部材と、支持部材の先端部外周面に形成された雄螺子部に螺着可能な雌螺子部が形成され、コレット部材を支持部材に保持すると共にコレット部材を軸線方向に押込動作させ、コレット部材を縮径動作させるチャックナットとを備えてなり、上記コレット部材は上記支持部材の先端部に装着される保持部材と、該保持部材に割溝間隙を存して放射状に環状配置され、該チャックナットの締付回動により半径方向に縮径動作してドリルを把持可能な複数個のコレット爪とからなり、上記支持部材の外周面に位置規正外周面を形成すると共にチャックナットの内周面に該位置規正外周面に密嵌して支持部材とコレット爪との相対位置を規正する位置規正内周面を形成してなることを特徴とするドリルチャック。A support member attached to and held at the tip of the spindle of the machine tool, a collet member attached to the tip of the support member, and a female screw that can be screwed into a male screw formed on the outer peripheral surface of the tip of the support member And a chuck nut that holds the collet member on the support member and pushes the collet member in the axial direction to reduce the diameter of the collet member. The collet member is disposed at the tip of the support member. A holding member to be mounted, and a plurality of collets that are arranged radially in the holding member with a split groove gap, and are capable of gripping a drill by radially reducing the diameter by tightening rotation of the chuck nut A position that is formed with a claw and that forms a position-regulating outer peripheral surface on the outer peripheral surface of the support member and that closely fits the position-regulating outer peripheral surface on the inner peripheral surface of the chuck nut to regulate the relative position between the support member and the collet claw Rule Drill chuck, characterized in that by forming a inner circumferential surface. 上記支持部材の外周面の雄螺子部の前後位置に位置規正外周面を形成すると共にチャックナットの内周面の雌螺子部の前後位置に該位置規正外周面に密嵌して支持部材とコレット爪との相対位置を規正する位置規正内周面を形成してなることを特徴とする請求項１記載のドリルチャック。A position-regulating outer peripheral surface is formed at the front and rear positions of the male screw portion on the outer peripheral surface of the support member, and the support member and the collet are closely fitted to the position-regulating outer peripheral surface at the front and rear positions of the female screw portion on the inner peripheral surface of the chuck nut. 2. The drill chuck according to claim 1, wherein a position regulating inner peripheral surface for regulating a relative position with the claw is formed. 上記保持部材を上記支持部材の装着穴に嵌合可能な筒状に形成し、該保持部材の内周面に複数個のコレット爪の基部を遊動状態に止着してなることを特徴とする請求項１又は２記載のドリルチャック。The holding member is formed in a cylindrical shape that can be fitted into the mounting hole of the support member, and a plurality of collet claw bases are fixed to the inner peripheral surface of the holding member in a floating state. The drill chuck according to claim 1 or 2. 上記コレット爪の中央外周部に環状凸部を形成し、該環状凸部の外周面に先広がりのテーパー外周面を形成し、上記支持部材の先端部内周面にテーパー外周面に摺動嵌合可能なテーパー内周面を形成し、該コレット爪の環状凸部の前段面に当接可能な内段面をチャックナットに形成してなることを特徴とする請求項１〜３のいずれか１項に記載のドリルチャック。An annular convex portion is formed on the central outer peripheral portion of the collet claw, a tapered outer peripheral surface is formed on the outer peripheral surface of the annular convex portion, and the tapered outer peripheral surface is slidably fitted to the inner peripheral surface of the tip end portion of the support member. 4. A taper inner peripheral surface is formed, and an inner step surface capable of contacting the front step surface of the annular convex portion of the collet claw is formed on the chuck nut. The drill chuck according to the item. 工作機械の主軸の先端部に支持部材を装着保持し、該支持部材の先端部に保持部材により割溝間隙を存して放射状に環状配置され、軸線方向の押込動作により半径方向に縮径動作してドリルを把持可能な複数個のコレット爪からなるコレット部材を装着し、支持部材の先端部外周面に形成された雄螺子部に締付回動によりコレット爪を押込動作させるチャックナットの雌螺子部を螺着し、支持部材の外周面に位置規正外周面を形成すると共にチャックナットの内周面に該位置規正外周面に密嵌して支持部材とコレット爪との相対位置を規正する位置規正内周面を形成してなることを特徴とするチャック装置。A support member is mounted and held at the tip of the main spindle of the machine tool, and the tip of the support member is radially annularly arranged with a split groove gap by the holding member, and is radially reduced by an axial pushing operation. A chuck nut female that is fitted with a collet member composed of a plurality of collet claws capable of gripping a drill and pushes the collet claw into a male screw portion formed on the outer peripheral surface of the front end portion of the support member by tightening rotation. The screw portion is screwed to form a position-regulating outer peripheral surface on the outer peripheral surface of the support member, and the relative position between the support member and the collet claw is regulated by closely fitting the position-regulating outer peripheral surface to the inner peripheral surface of the chuck nut. A chuck device comprising a position regulating inner peripheral surface. 上記支持部材の外周面の雄螺子部の前後位置に位置規正外周面を形成すると共にチャックナットの内周面の雌螺子部の前後位置に該位置規正外周面に密嵌して支持部材とコレット爪との相対位置を規正する位置規正内周面を形成してなることを特徴とする請求項５記載のチャック装置。A position-regulating outer peripheral surface is formed at the front and rear positions of the male screw portion on the outer peripheral surface of the support member, and the support member and the collet are closely fitted to the position-regulating outer peripheral surface at the front and rear positions of the female screw portion on the inner peripheral surface of the chuck nut. 6. The chuck device according to claim 5, wherein a position regulating inner peripheral surface for regulating a relative position with the claw is formed. 上記保持部材を上記支持部材の装着穴に嵌合可能な筒状に形成し、該保持部材の内周面に複数個のコレット爪の基部を遊動状態に止着してなることを特徴とする請求項４又は５記載のチャック装置。The holding member is formed in a cylindrical shape that can be fitted into the mounting hole of the support member, and a plurality of collet claw bases are fixed to the inner peripheral surface of the holding member in a floating state. The chuck device according to claim 4 or 5.
JP29352499A 1999-10-15 1999-10-15 Drill chuck and chuck device Expired - Fee Related JP4273377B2 (en)

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US8888420B2 (en) * 2007-03-15 2014-11-18 Primetool Mfg, Inc. Tool chucking apparatus
CN104619445B (en) * 2012-08-17 2016-10-19 长野自动机械株式会社 Collet, head and there is the processing unit (plant) of collet
CN113020643B (en) * 2021-03-29 2022-05-03 成都工贸职业技术学院 High-precision full-contact-surface chuck
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