JP3954715B2

JP3954715B2 - Tool chuck

Info

Publication number: JP3954715B2
Application number: JP05588098A
Authority: JP
Inventors: 均石川
Original assignee: NT Tool Corp
Current assignee: NT Tool Corp
Priority date: 1998-02-20
Filing date: 1998-02-20
Publication date: 2007-08-08
Anticipated expiration: 2018-02-20
Also published as: JPH11235608A

Description

【０００１】
【発明の属する技術分野】
本発明は工具を装着保持する為の工具チャックに関し、詳しくはチャック筒を加熱、冷却することによって工具の抜差し、固定が行われるようにした工具チャックに関する。
【０００２】
【従来の技術】
先部に、工具を装着する為の工具保持孔を有するチャック筒を備え、そのチャック筒を加熱膨張させることによって工具保持孔内に工具の挿入を可能にし、チャック筒が冷却することによって工具保持孔が収縮して工具を締付保持するようにしてある工具チャックは知られている。
【０００３】
上記構成の工具チャックは、チャック筒の先端に工具を締付ける為の特別な締付リング等の付加物を要しない為、先端の径を細くできる利点がある。またチャック筒と工具との一体性も良く精度も高い特長がある。
【０００４】
【発明が解決しようとする課題】
この従来の工具チャックでは加工作業中において工具が折れたとき等、工具の取換を急いで行なわねばならないとき、チャック筒の加熱膨張に時間が掛るその上に、チャック筒の冷却に随分と長い時間を要し、その間、加工作業を休み、ラインを止めねばならぬという作業効率の低下をもたらす問題点があった。
【０００５】
本件出願の工具チャックは、上記従来技術の問題点を解決する為に提供するものである。
本件出願の目的は、チャック筒の加熱、冷却によって工具の取替、固定が可能で、チャック筒の先端に太径の原因となる締付リングを要せず、先細のチャック筒が得られるようにした工具チャックを提供しようとするものである。
他の目的は、チャック筒の加熱時のみならず、冷却時の冷却時間が大幅に短くなり、しかもチャック筒の曲げ、又は捻れに対して強く、或は締付の強度が充分得られるようにした工具チャックを提供しようとするものである。
他の目的及び利点は図面及びそれに関連した以下の説明により容易に明らかになるであろう。
【０００６】
【課題を解決するための手段】
本願発明における工具チャックは、先部に、工具を装着する為の工具保持孔を有するチャック筒（３）を備え、そのチャック筒を加熱膨張させることによって工具保持孔内に工具（９）の挿入を可能にし、チャック筒が冷却することによって工具保持孔（８）が収縮して工具を締付保持するようにしてある工具チャックにおいて、
上記チャック筒（３）は、中心部に工具保持孔（８）を備え、
その工具保持孔の周囲には工具を締付保持する為の筒状の収縮締付部（ 3c ）を備え、
さらに上記筒状の収縮締付部（ 3c ）の外周位置には、夫々筒心方向に長く形成し、かつ、深さをチャック筒の外周面（１１）から上記筒状の収縮締付部（ 3c ）に至る深さに形成した複数の凹溝（ 13 ・・・ 13 ）を備えると共に、
夫々筒心方向に長く形成してあって、かつ、両側の側壁面からも放熱効果が得られるように上記凹溝（ 13 ・・・ 13 ）に両側の側壁面を対向させた状態で複数の凹溝の間に補強リブ（ 14 、・・・ 14 ）を夫々介在状態で備えさせ、
しかも、上記複数の補強リブ（ 14 、・・・ 14 ）の夫々は筒状の収縮締付部（ 3c ）と一体材で形成したものである。
また好ましくは、先部に、工具を装着する為の工具保持孔を有するチャック筒（ 3e ）を備え、そのチャック筒を加熱膨張させることによって工具保持孔内に工具の挿入を可能にし、チャック筒が冷却することによって工具保持孔（ 8e ）が収縮して工具を締付保持するようにしてある工具チャックにおいて、
上記チャック筒（ 3e ）は、中心部に工具保持孔（ 8e ）を備え、
その工具保持孔（ 8e ）の周囲には工具を締付保持する為の筒状の収縮締付部（ 3ce ）を備え、さらに上記筒状の収縮締付部（ 3ce ）の外周位置には、深さをチャック筒の外周面から上記筒状の収縮締付部（ 3ce ）に至る深さに形成し、穴の周壁面からも放熱効果が得られるようにした多数の凹陥状の穴（ 33 ・・・ 33 ）を縦横に列設すると共に、
それら多数の凹陥状の穴（ 33 ・・・ 33 ）の列設状態は、凹陥状の穴相互間に、筒心方向に向けて長く、かつ連続状になった複数の補強リブ（ 34 ・・・ 34 ）と、周方向に向けて長く、かつ連続状になった複数の補強リブ（ 34 ・・・ 34 ）が夫々形成されるように配列してあり、しかも、上記の筒心方向に向けて長い複数の補強リブ（ 34 ・・・ 34 ）と、周方向に向けて長い複数の補強リブ（ 34 ・・・ 34 ）は夫々筒状の収縮締付部（ 3ce ）と一体材で形成したものである。
【０００７】
【発明の実施の形態】
以下本願発明の実施の形態を示す図面について説明する。図１乃至図３において、符号２〜９は従来より知られている工具チャックの構成と略同様の構成、機能を有するものを示す。１はチャック本体であり、前部側に、外周を緩い先細テーパ面としたチャック筒３を構成すると共に、後部側がマシニングセンタ等のスピンドルに対して着脱自在に取り付けられる先細テーパ状のシャンク部２となり、中央部外周にマニュピュレーター把持用等のＶ溝５を周設具備するチャック位置決め用鍔部４を備えている。６は切削に用いる工具等、加工用の工具９の差込深さを調節する為に進退自在にした位置決め部材、７はそれの操作孔、8は工具保持孔を示す。なお、部材６、及び工具９に液体通過孔を設け、操作孔７から冷却液を工具９の先に流すようにしたものもある。
【０００８】
次にチャック筒３は、これを加熱膨張させることによって工具保持孔８内に工具９の元部の挿入を可能にし、チャック筒３が冷却することによって工具保持孔８が収縮して工具９の元部を締付一体化して保持するようにしてある。工具保持孔８の内径は、工具９の元部外径よりもやや小さく形成してあり、加熱膨張によって工具９の外径より大きくなり、工具９の元部を先端3aから工具保持孔８内に摺動状に挿入できるようにしてある。
【０００９】
次に上記チャック筒３の外周部3bには、工具保持孔８の周壁8a近くに筒状の収縮締付部3cが残る程度の深さにした複数の凹溝13、13・・・13を形成し、かつ凹溝13の相互間には夫々放射方向に向けて張出す補強リブ14を形成具備させている。上記凹溝13は図に示す如く、チャック筒３の筒心方向に平行に向けてあり、従って上記補強リブ14もチャック筒の筒心と同方向に向って延びる。このようにすると、チャック筒３の外周面11を切れ目なく結んだ場合に比較して外気に接する面は多くなり、任意の熱源Ｆ、例えば、バーナーによって加熱する場合は熱吸収が早く、放冷する場合も放熱効果がよくなる。また補強リブ14は、凹溝13に対して図3の比率で形成することにより、上記の高い放熱効果を維持しながら、曲げ方向（半径方向）に対しては大きな肉厚14aを維持し、大きな耐曲げ力を維持する。
【００１０】
上記構成のものにあっては、工具９の取替時、チャック筒３の外周面11に向けて熱源（例えばバーナーの燃焼ガス、その他の熱線等）を与え、チャック筒３を加熱膨張させると、工具保持孔８から工具９を抜取ることができ、直ちに他の工具９を挿入し、自然放冷させるとチャック筒の工具保持孔８の周囲に位置する収縮締付部3cは収縮して工具９を締付一体化する。この場合の一般的な所要時間は図６に示すように、本願発明に係る工具チャック(D)は、外周径が同じ従来品(E)に比較して昇温が早いは勿論、放冷においても、収縮完了の温度（50℃）に達する時間が早く、約70％でよい。即ち、従来品(Ｂ)が１２分必要なのに対し、8分余という短さでよい。
なお上記のように構成すると、図１、２図に示す工具チャックは次のような機能があり、吸熱、放熱効果が高く、工具９の取替作業を図８の(Ｄ線)に示す如く短時間で早く行うことができる。また筒状の収縮締付部3cは、補強リブが存在するところでは実質的に肉厚となり、凹溝の位置では肉薄となり、収縮状態に斑が生じる。従って工具９の元部外面においては、締付斑が生じ、全周均等に締付けられるよりも、把持状態が良くなる。
【００１１】
次に、図１の工具チャックとはチャック筒3eにおける外周部3beの凹溝33及び補強リブ34の構造の点において異なる例を示す図４、５について説明する。複数の凹溝33は、夫々チャック筒3eの外周面に散設してあり、夫々は円柱形の穴状で、凹陥状に形成してある。補強リブ34は夫々図示のように残る部材で周方向及び軸心方向に向けて連続状に位置させてある。即ち、図示のように多数の凹陥状の穴33の列設状態は、凹陥状の穴33相互間に、筒心方向に向けて長く、かつ連続状になった複数の補強リブ34と、周方向に向けて長く、かつ連続状になった複数の補強リブ34が夫々形成されるように配列してある。
このように構成すると、捻れに対して耐える力が大きく、かつ図１、２図に示す工具チャックと同様に表面積が拡大し、吸熱、放熱効果が高く、工具９の取替作業を図６の(Ｄ線)に示す如く短時間で早く行うことができる。また筒状の収縮締付部3ceは、補強リブ34が存在するところでは実質的に肉厚となり、凹溝33の位置では肉薄となり、収縮状態に斑が生じる。従って工具９の元部外面においては、軸心方向に締付斑が生じ、全周均等に締付けられるよりも、把持状態が良くなる。
なお、図４、５において機能上前述の図１〜３のものと同一又は均等構成と考えられる部分には、前述の図１〜３と同一の符号にアルファベットのｅを付して重複する説明を省略した。
【００１２】
【発明の効果】
以上のように本願発明は、加熱、冷却によって工具９の抜取り、差込、締付ができるので、チャック筒３の先を細く形成できる利点がある。
【００１３】
その上、工具９の取替に当たっては、チャック筒３が短時間で昇温し、短時間で冷却するので、工具９の取替を早くすることのできる作業上の効果もある。
【００１４】
特に、本願発明の上記チャック筒にあっては、
中心部に工具保持孔を備え、その工具保持孔の周囲には工具を締付保持する為の筒状の収縮締付部を備え、さらに上記筒状の収縮締付部の外周位置には、夫々筒心方向に長く形成し、かつ、深さをチャック筒の外周面から上記筒状の収縮締付部に至る深さに形成した複数の凹溝を周設すると共に、夫々筒心方向に長く形成してあって、かつ、両側の側壁面からも放熱効果が得られるように上記凹溝に両側の側壁面を対向させた状態で上記複数の凹溝の間に夫々介在する状態で周設された複数の補強リブを備えるものであるから、
複数の凹溝底面からの放熱効果があると共に、複数の補強リブの両側壁面及び外周面からの広い面積からの放熱効果があり、工具９の取替を早くすることのできる作業上の効果がある。
【００１５】
また上記複数の凹溝の間に夫々介在する状態で放熱効果を高める為に周設された複数のリブ 14 、 14 ・・・は、夫々筒心方向に長く形成してあるから、
上記チャック筒にあっては、広い面積からの放熱効果を得る為に複数の凹溝 13 、 13 ・・が周設されているにも拘わらず、図１における鍔部４と先端 3a の間の曲げに対する応力は極めて高い（腰折れ防止効果が大きい）ものとなり、加工中において、軸心の曲がりを防止することができる。
このことは、上記チャック筒に装着した刃物９の先端が放射方向に振れることを防止し、加工精度を高める上に効果がある。
さらに「複数の凹溝 13 、 13 ・・」を周設しても、夫々筒心方向に長く形成した複数のリブ 14 、 14 ・・・の存在により、図１における鍔部４と先端 3a の間の曲げに対する応力は極めて高いものとなっているから、特段上記のチャック筒を太い径にする必要は無く、結局、チャック筒は細長く形成して、壁の際を加工したり、深い穴を加工するに適するものとして提供することができる効果がある。
【００１６】
また、上記のように「筒状の収縮締付部の外周位置には、夫々筒心方向に長く形成し、かつ、深さをチャック筒の外周面から上記筒状の収縮締付部に至る深さに形成した複数の凹溝を周設すると共に、夫々筒心方向に長く形成してあって、かつ、両側の側壁面からも放熱効果が得られるように上記複数の凹溝の間に夫々介在する状態で周設され、しかも、上記筒状の収縮締付部と一体材で形成してある複数の補強リブを備えるものである」から、上記チャック筒３（図４、５では符号 3e ）にあって、締め付け状態では、複数の凹溝23の夫々の位置では肉薄となり、軸心方向に長く形成された複数の補強リブ（図 1 〜３では符号 14 、・・・ 14 、・図４、５では符号３４）の位置では肉厚となって、周方向において収縮状態に斑が生じる。
従って工具９の元部外面においては、回転方向に締付斑が生じ、全周均等に締付けられるよりも、すこぶる強力な把持状態が得られる効果もある。
【００１７】
更に本願発明における請求項２に記載のチャック筒にあって、「筒状の収縮締付部の外周位置には、深さをチャック筒の外周面から上記筒状の収縮締付部に至る深さに形成し、穴の周壁面からも放熱効果が得られるようにした多数の凹陥状の穴を列設すると共に、
それら多数の凹陥状の穴の列設状態は、凹陥状の穴相互間に、筒心方向に向けて長く、かつ連続状になった複数の補強リブと、周方向に向けて長く、かつ連続状になった複数の補強リブが夫々形成されるように配列してあり、
しかも、上記の筒心方向に向けて長い複数の補強リブと、周方向に向けて長い複数の補強リブは夫々筒状の収縮締付部と一体材で形成した」場合においては、図４、図５からも知ることができるように、前述した、即ち、図 1 〜図 3 に示される上記チャック筒の場合と同旨の夫々優れた有用性のある複数の効果が得られる。
【図面の簡単な説明】
【図１】工具チャックの断面図。
【図２】工具チャックの正面図。
【図３】図１のＡ−Ａ’断面図。
【図４】図１とは異なる構成のチャック筒を備えるチャック筒の一部破断図。
【図５】図４のＣ−Ｃ’断面図。
【図６】従来品との昇温、降温状態を比較する為の温度曲線図。
【符号の説明】
１工具チャック
３チャック筒
3c 収縮締付部
８工具保持孔
９工具
11 外周面
13 凹溝
14 補強リブ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tool chuck for mounting and holding a tool, and more particularly to a tool chuck in which a tool is inserted and removed by heating and cooling a chuck cylinder.
[0002]
[Prior art]
A chuck cylinder having a tool holding hole for mounting a tool is provided at the tip, and the tool can be inserted into the tool holding hole by heating and expanding the chuck cylinder, and the tool holding is performed by cooling the chuck cylinder. Tool chucks are known in which the hole shrinks to hold the tool in place.
[0003]
The tool chuck having the above-described configuration has an advantage that the diameter of the tip can be reduced because an additional product such as a special tightening ring for fastening the tool to the tip of the chuck cylinder is not required. In addition, the chuck cylinder and the tool are well integrated with high accuracy.
[0004]
[Problems to be solved by the invention]
In the case of this conventional tool chuck, when the tool needs to be replaced quickly, such as when the tool is broken during processing, it takes time to heat and expand the chuck cylinder, and the cooling of the chuck cylinder is much longer. There was a problem that it took time, and during that time, the machining work was interrupted and the line had to be stopped, resulting in a decrease in work efficiency.
[0005]
The tool chuck of the present application is provided to solve the above-described problems of the prior art.
The purpose of the present application is to allow replacement and fixing of the tool by heating and cooling of the chuck cylinder, so that a tapered chuck cylinder can be obtained without requiring a clamping ring that causes a large diameter at the tip of the chuck cylinder. An object of the present invention is to provide a tool chuck.
Another purpose is not only to heat the chuck cylinder but also to significantly shorten the cooling time during cooling, and to be strong against bending or twisting of the chuck cylinder or to obtain sufficient tightening strength. An attempt is made to provide a tool chuck.
Other objects and advantages will be readily apparent from the drawings and the following description associated therewith.
[0006]
[Means for Solving the Problems]
The tool chuck according to the present invention is provided with a chuck cylinder (3) having a tool holding hole for mounting a tool at the tip, and the tool (9) is inserted into the tool holding hole by heating and expanding the chuck cylinder. In the tool chuck in which the tool holding hole (8) is contracted by the chuck cylinder being cooled and the tool is clamped and held,
The chuck cylinder (3) includes a tool holding hole (8) at the center,
Around the tool holding hole is equipped with a cylindrical shrinkage tightening part ( 3c ) for tightening and holding the tool ,
Further, at the outer peripheral position of the cylindrical shrinkage tightening portion ( 3c ), each of the cylindrical shrinkage tightening portions ( 3c ) is formed long in the tube center direction, and the depth is changed from the outer peripheral surface (11) of the chuck tube to the cylindrical shrinkage tightening portion ( 3c ) with a plurality of grooves ( 13 ... 13 ) formed to a depth up to
Each of the plurality of grooves is formed in a state where the side wall surfaces on both sides are opposed to the concave grooves ( 13 ... 13 ) so as to be long in the cylindrical direction and to obtain a heat radiation effect from the side wall surfaces on both sides. Reinforcing ribs ( 14 , ... 14 ) are provided between the concave grooves ,
Moreover, each of the plurality of reinforcing ribs ( 14 ,... 14 ) is formed of an integral material with the cylindrical shrinkage tightening portion ( 3c ) .
Preferably, a chuck cylinder ( 3e ) having a tool holding hole for mounting a tool is provided at the tip , and the chuck cylinder is heated and expanded so that the tool can be inserted into the tool holding hole. In the tool chuck in which the tool holding hole ( 8e ) contracts by cooling and the tool is clamped and held,
The chuck cylinder ( 3e ) has a tool holding hole ( 8e ) in the center,
Around the tool holding hole ( 8e ), there is a cylindrical shrinkage tightening part ( 3ce ) for tightening and holding the tool, and at the outer peripheral position of the cylindrical shrinkage tightening part ( 3ce ), A number of recessed holes ( 33 ) are formed so that the depth extends from the outer peripheral surface of the chuck cylinder to the cylindrical shrinkage tightening part ( 3ce ), and the heat dissipation effect is also obtained from the peripheral wall surface of the hole. ... 33 ) are arranged vertically and horizontally,
The arrangement of these many recessed holes ( 33 ... 33 ) is such that a plurality of reinforcing ribs ( 34, ... ) That are long and continuous in the direction of the cylinder center between the recessed holes. · and 34), long toward the circumferential direction, and a plurality of reinforcing ribs in continuous form (34 ... 34) Yes and arranged to be respectively formed, moreover, directed to the above cylinder axis direction A plurality of long and long reinforcing ribs ( 34 ... 34 ) and a plurality of reinforcing ribs ( 34 ... 34 ) that are long in the circumferential direction are formed of a single member with a cylindrical shrinkage fastening portion ( 3ce ). It is a thing.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, drawings showing embodiments of the present invention will be described. 1 to 3, reference numerals 2 to 9 denote components having substantially the same configuration and function as those of conventionally known tool chucks. Reference numeral 1 denotes a chuck body. A chuck cylinder 3 having a tapered taper surface with a loose outer periphery is formed on the front side, and a tapered side shank portion 2 is detachably attached to a spindle such as a machining center on the rear side. Further, a chuck positioning collar 4 having a V-groove 5 for gripping a manipulator around the center is provided. Reference numeral 6 denotes a positioning member which can be moved forward and backward to adjust the insertion depth of the working tool 9 such as a tool used for cutting, 7 is an operation hole thereof, and 8 is a tool holding hole. In some cases, a liquid passage hole is provided in the member 6 and the tool 9, and a coolant is allowed to flow from the operation hole 7 to the tip of the tool 9.
[0008]
Next, the chuck cylinder 3 is heated and expanded so that the tool 9 can be inserted into the tool holding hole 8. When the chuck cylinder 3 is cooled, the tool holding hole 8 contracts and the tool 9 The base part is clamped and held together. The inner diameter of the tool holding hole 8 is formed slightly smaller than the outer diameter of the original part of the tool 9 and becomes larger than the outer diameter of the tool 9 due to thermal expansion, and the original part of the tool 9 extends from the tip 3a into the tool holding hole 8. Can be inserted in a sliding manner.
[0009]
Next, a plurality of concave grooves 13, 13... 13 are formed in the outer peripheral portion 3b of the chuck cylinder 3 so as to leave a cylindrical shrinkage tightening portion 3c near the peripheral wall 8a of the tool holding hole 8. Reinforcing ribs 14 that are formed and that extend in the radial direction are formed between the concave grooves 13. As shown in the drawing, the concave groove 13 is directed parallel to the cylinder center direction of the chuck cylinder 3, and therefore the reinforcing rib 14 also extends in the same direction as the cylinder axis of the chuck cylinder. In this way, the number of surfaces that come into contact with the outside air is increased as compared with the case where the outer peripheral surface 11 of the chuck cylinder 3 is connected without breaks. When it does, the heat dissipation effect is improved. In addition, the reinforcing rib 14 is formed at a ratio of FIG. 3 with respect to the concave groove 13 to maintain a large thickness 14a in the bending direction (radial direction) while maintaining the above high heat dissipation effect, Maintain high bending strength.
[0010]
In the above configuration, when the tool 9 is replaced, a heat source (for example, burner combustion gas, other heat rays) is applied to the outer peripheral surface 11 of the chuck cylinder 3, and the chuck cylinder 3 is heated and expanded. The tool 9 can be removed from the tool holding hole 8, and when another tool 9 is immediately inserted and allowed to cool naturally, the shrinkage tightening portion 3c located around the tool holding hole 8 of the chuck cylinder contracts. The tool 9 is tightened and integrated. As shown in FIG. 6, the general time required in this case is that the tool chuck (D) according to the present invention has a higher temperature rise than the conventional product (E) having the same outer diameter, and is also allowed to cool. However, it takes about 70% to reach the temperature at which the shrinkage is completed (50 ° C.) quickly. That is, while the conventional product (B) requires 12 minutes, it may be as short as 8 minutes.
When configured as described above, the tool chuck shown in FIGS. 1 and 2 has the following functions, has high heat absorption and heat dissipation effects, and the tool 9 replacement operation is as shown in FIG. 8 (D line). It can be done quickly in a short time. Further, the cylindrical shrinkage tightening portion 3c is substantially thick where the reinforcing rib is present, thin at the position of the concave groove, and unevenness occurs in the contracted state. Accordingly, tightening spots are generated on the outer surface of the base portion of the tool 9, and the gripping state is improved compared to the case where the entire periphery is tightened evenly.
[0011]
Next, FIGS. 4 and 5 showing an example different from the tool chuck of FIG. 1 in the structure of the concave groove 33 and the reinforcing rib 34 of the outer peripheral portion 3be in the chuck cylinder 3e will be described. The plurality of concave grooves 33 are scattered on the outer peripheral surface of the chuck cylinder 3e, and each has a cylindrical hole shape and is formed in a concave shape. Reinforcing ribs 34 are remaining members as shown in the figure, and are continuously located in the circumferential direction and the axial direction. That is, as shown in the figure, the arrayed state of a large number of recessed holes 33 is formed between the recessed holes 33 and a plurality of reinforcing ribs 34 that are long and continuous in the cylinder center direction, and the circumferential direction. A plurality of reinforcing ribs 34 that are long in the direction and continuous are formed so as to be formed.
When configured in this manner, the force to withstand twisting is large, and the surface area is increased in the same manner as the tool chuck shown in FIGS. 1 and 2, and the heat absorption and heat radiation effects are high. As shown in (D line), it can be performed quickly in a short time. Further, the cylindrical shrinkage tightening portion 3ce is substantially thick where the reinforcing ribs 34 are present, thin at the position of the concave groove 33, and unevenness occurs in the contracted state. Therefore, on the outer surface of the base portion of the tool 9, tightening spots are generated in the axial direction, and the gripping state is improved compared to the case where the entire periphery is tightened uniformly.
In FIGS. 4 and 5, parts that are functionally the same as or equivalent to those in FIGS. 1 to 3 described above are denoted by the same reference numerals as those in FIGS. Was omitted.
[001 2 ]
【The invention's effect】
As described above, the present invention has an advantage that the tip of the chuck cylinder 3 can be formed thin because the tool 9 can be extracted, inserted, and tightened by heating and cooling.
[00 13 ]
In addition, when the tool 9 is replaced, the chuck cylinder 3 is heated in a short time and cooled in a short time, so that there is also an operational effect that can quickly replace the tool 9.
[00 14 ]
In particular, in the chuck cylinder of the present invention ,
A tool holding hole is provided at the center, a cylindrical shrinkage tightening part for tightening and holding the tool is provided around the tool holding hole, and an outer peripheral position of the cylindrical shrinkage tightening part is A plurality of grooves are formed so as to be long in the cylinder center direction and the depth is formed from the outer peripheral surface of the chuck cylinder to the cylindrical shrinkage tightening portion. It is formed in a long shape, and in a state where it is interposed between the plurality of concave grooves, with the side wall surfaces on both sides facing the concave groove so that a heat radiation effect can be obtained from both side wall surfaces. Because it has a plurality of reinforcing ribs installed,
There is a heat dissipation effect from the bottom surfaces of the plurality of concave grooves, a heat dissipation effect from a wide area from the both side walls and the outer peripheral surface of the plurality of reinforcing ribs, and an operational effect that can speed up the replacement of the tool 9 is there.
[0015]
In addition, the plurality of ribs 14 , 14 ... Provided in order to enhance the heat dissipation effect in a state of being interposed between the plurality of concave grooves, respectively, are formed long in the cylinder center direction.
In the above chuck cylinder, a plurality of concave grooves 13 , 13 ... Are provided in order to obtain a heat radiation effect from a wide area , but between the flange 4 and the tip 3a in FIG. The stress for bending becomes extremely high (the effect of preventing hip breakage is great), and bending of the shaft center can be prevented during processing.
This prevents the tip of the blade 9 attached to the chuck cylinder from swinging in the radial direction, and is effective in increasing the processing accuracy.
Furthermore even if "a plurality of grooves 13, 13 ..." was circumferentially by the presence of a plurality of ribs 14, 14 ... which is elongated in the respective cylinder axis direction, of the flange portion 4 and the tip 3a in FIG. 1 Since the stress against bending is extremely high, it is not necessary to make the above-mentioned chuck cylinder particularly thick, after all, the chuck cylinder is formed to be elongated, and the edge of the wall is processed or a deep hole is formed. There exists an effect which can be provided as a thing suitable for processing.
[0016]
In addition, as described above, “the cylindrical shrinkage tightening portion is formed to be long in the cylinder center direction at the outer peripheral position, and the depth extends from the outer peripheral surface of the chuck tube to the cylindrical shrinkage tightening portion. A plurality of concave grooves formed at a depth are provided around each of the plurality of concave grooves so as to be long in the cylinder center direction and to obtain a heat radiation effect from the side wall surfaces on both sides. The chuck cylinder 3 (reference numerals in FIGS. 4 and 5) is provided with a plurality of reinforcing ribs that are provided around the cylindrical shrinkage tightening portion and formed integrally with each other. in the 3e), the clamping state, becomes thin at the position of each of a plurality of grooves 23, a plurality of reinforcing ribs elongated in the axial direction (Fig. 1-3 in code 14, ... 14, - 4 and 5, the thickness becomes thick at the position 34), and unevenness occurs in the contracted state in the circumferential direction .
Therefore, on the outer surface of the base part of the tool 9, tightening spots are generated in the rotation direction, and there is an effect that a much stronger gripping state can be obtained rather than tightening evenly all around.
[0017]
Furthermore, in the chuck cylinder according to claim 2 of the present invention, “the depth at the outer peripheral position of the cylindrical shrinkage tightening portion is a depth from the outer peripheral surface of the chuck tube to the cylindrical shrinkage tightening portion. In addition to arranging a large number of recessed holes that are formed in such a way that a heat dissipation effect can be obtained from the peripheral wall surface of the hole,
The arrangement of the many recessed holes is continuous between the recessed holes and is continuous in a long and continuous manner with a plurality of reinforcing ribs that are long and continuous in the cylindrical direction. Are arranged so that a plurality of reinforcing ribs are formed,
In addition, in the case where the plurality of reinforcing ribs that are long in the cylindrical center direction and the plurality of reinforcing ribs that are long in the circumferential direction are each formed of a cylindrical shrinkage tightening portion and an integral material, FIG. As can be seen from FIG. 5 , a plurality of advantageous effects each having the same advantages as those of the above-described chuck cylinder shown in FIGS . 1 to 3 can be obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a tool chuck.
FIG. 2 is a front view of a tool chuck.
FIG. 3 is a cross-sectional view taken along the line AA ′ in FIG.
FIG. 4 is a partially cutaway view of a chuck cylinder including a chuck cylinder having a configuration different from that of FIG.
5 is a cross-sectional view taken along the line CC ′ of FIG.
FIG. 6 is a temperature curve diagram for comparing temperature rise and temperature drop states with a conventional product.
[Explanation of symbols]
1 Tool chuck 3 Chuck cylinder
3c Shrink tightening part 8 Tool holding hole 9 Tool
11 Outer surface
13 groove
14 Reinforcement rib

Claims

The tip is provided with a chuck cylinder (3) having a tool holding hole for mounting a tool, and the chuck cylinder is heated and expanded so that the tool (9) can be inserted into the tool holding hole. In the tool chuck in which the tool holding hole (8) contracts by cooling and the tool is clamped and held,
The chuck cylinder (3)
A tool holding hole (8) is provided in the center,
Around the tool holding hole ( 8 ), there is a cylindrical shrinkage tightening part ( 3c ) for tightening and holding the tool .
Further, at the outer peripheral position of the cylindrical shrinkage tightening portion ( 3c ), each of the cylindrical shrinkage tightening portions ( 3c ) is formed long in the tube center direction, and the depth is changed from the outer peripheral surface (11) of the chuck tube to the cylindrical shrinkage tightening portion ( 3c ) with a plurality of grooves ( 13 ... 13 ) formed to a depth up to
Each of the plurality of grooves is formed in a state where the side wall surfaces on both sides are opposed to the concave grooves ( 13 ... 13 ) so as to be long in the cylindrical direction and to obtain a heat radiation effect from the side wall surfaces on both sides. Reinforcing ribs ( 14 , ... 14 ) are provided between the concave grooves ,
Moreover, each of the plurality of reinforcing ribs ( 14 ,... 14 ) is formed integrally with the cylindrical shrinkage tightening portion ( 3c ) .

A chuck cylinder ( 3e ) having a tool holding hole for attaching a tool is provided at the tip , and the chuck cylinder is cooled by allowing the tool to be inserted into the tool holding hole by heating and expanding the chuck cylinder. In the tool chuck in which the tool holding hole ( 8e ) is shrunk to hold the tool by tightening,
The chuck cylinder ( 3e )
With a tool holding hole ( 8e ) in the center,
Around the tool holding hole ( 8e ), there is a cylindrical shrinkage tightening part ( 3ce ) for tightening and holding the tool, and at the outer peripheral position of the cylindrical shrinkage tightening part ( 3ce ), A number of recessed holes ( 33 ) are formed so that the depth extends from the outer peripheral surface of the chuck cylinder to the cylindrical shrinkage tightening part ( 3ce ), and the heat dissipation effect is also obtained from the peripheral wall surface of the hole. ... 33 ) are arranged vertically and horizontally,
The arrangement of these many recessed holes ( 33 ... 33 ) is such that a plurality of reinforcing ribs ( 34, ... ) That are long and continuous in the direction of the cylinder center between the recessed holes. · and 34), long toward the circumferential direction, and a plurality of reinforcing ribs in continuous form (34 ... 34) Yes and arranged to be respectively formed,
In addition, the plurality of reinforcing ribs ( 34 ... 34 ) that are long in the cylinder center direction and the plurality of reinforcing ribs ( 34 ... 34 ) that are long in the circumferential direction are respectively cylindrical shrinkage tightening portions. ( 3ce ) and a tool chuck characterized by being formed of an integral material .