JP3190089U

JP3190089U - Collet chuck structure

Info

Publication number: JP3190089U
Application number: JP2014000518U
Authority: JP
Inventors: 桐茂 ▲リョウ▼
Original assignee: 裕可有限公司
Filing date: 2014-02-03
Publication date: 2014-04-17
Anticipated expiration: 2024-02-03

Abstract

【課題】十分な挟持力を持たせ、長いブレードと短いブレードのどちらのドリルにも適用できるコレットチャック構造を提供する。
【解決手段】前後端面を貫通するセンターバレル３０と、後端へ徐々に縮小する後錐部４０と、前端へ徐々に縮小し、後錐部より長い前錐部５０と、外周面に設けられ且つ前後錐部の間に位置する環溝６０と、前端面から後錐部に延伸し且つ後端面まで貫通しない複数の前切断溝と、後錐部から前錐部に延伸し且つ外周面からセンターバレルに貫通し、複数の前切断溝と交錯設置される複数の後切断溝と、を含み、隣り合う前切断溝間にコレットチャックを形成し、その前端の内側面にセンターバレル中心へ凸設するクリップブロック７２を有し、クリップブロックが前錐部の半分より短く、複数の後切断溝が複数の開放溝８１と封止溝８２を含み、開放溝の前端が密閉状を呈して後端が開口状を呈し、封止溝の前後端が密閉状を呈する。
【選択図】図９The present invention provides a collet chuck structure that has a sufficient clamping force and can be applied to both long blade and short blade drills.
A center barrel 30 penetrating the front and rear end surfaces, a rear cone portion 40 that gradually decreases toward the rear end, a front cone portion 50 that gradually decreases toward the front end and is longer than the rear cone portion, and an outer peripheral surface are provided. And an annular groove 60 located between the front and rear conical portions, a plurality of front cutting grooves extending from the front end surface to the rear conical portion and not penetrating to the rear end surface, and extending from the rear conical portion to the front conical portion and from the outer peripheral surface A plurality of rear cutting grooves penetrating the center barrel and crossing with a plurality of front cutting grooves, and forming a collet chuck between adjacent front cutting grooves and projecting toward the center of the center barrel on the inner surface of the front end A clip block 72 is provided, the clip block is shorter than half of the front cone portion, a plurality of rear cutting grooves include a plurality of open grooves 81 and a sealing groove 82, and the front end of the open groove is hermetically sealed The ends have an opening shape, and the front and rear ends of the sealing groove have a sealed shape.
[Selection] Figure 9

Description

本考案は、ドリルを挟持固定することに用いるコレットチャック構造方面の技術分野に関し、特に、十分な挟持力を有し、長い刃のドリル及び短い刃のドリルを挟持することに適用可能なコレットチャック構造に関する。 The present invention relates to a technical field of a collet chuck structure used to clamp and fix a drill, and in particular, has a sufficient clamping force and can be applied to clamp a long blade drill and a short blade drill. Concerning structure.

台湾公告第Ｍ２８４４８３号の専利は、一般によく見られるブレード又はドリル研磨機上に応用されるコレットチャック構造であり、その構造は、図１〜図３に示すように、主に固定部材１０、ナット１１及び該固定部材１０及び該ナット１１の間に挟み設けられるコレットチャック１２を含み、そのうち、該コレットチャック１２は、前後端面を貫通するセンターバレル１３、後方へ向けて徐々に縮小する後錐部１４、前方へ向けて徐々に縮小し且つ該後錐部１４より長い前錐部１５、前端面から該後錐部１４に延伸し且つ後端面を貫通しない複数の前切断溝１６及び後端面１６から該前錐部１５に延伸し且つ該前端面を貫通しない複数の後切断溝１７を含む。各２つの互いに隣り合う前切断溝１６の間は、それぞれクリップ爪１８を形成し、該クリップ爪１８の前端の内側面にそれぞれ該センターバレル１３の中央へ凸設するクリップブロック１９を有し、該クリップブロック１９の長さは、該前錐部１５の半分より大きい。該複数のクリップ爪１８のクリップブロック１９は、該センターバレル１３の前端にクリップ孔１９０を囲う。そのうち、該前切断溝１６及び該後切断溝１７の数量は、それぞれ８つであるか、それぞれ６つであることができる。 Taiwan Patent No. M284443 has a collet chuck structure that is applied to a blade or a drill grinder which is commonly seen. The structure is mainly composed of a fixing member 10 and a nut as shown in FIGS. 11 and a collet chuck 12 sandwiched between the fixing member 10 and the nut 11, of which the collet chuck 12 includes a center barrel 13 that penetrates the front and rear end surfaces, and a rear cone portion that gradually shrinks rearward. 14, a front conical portion 15 that gradually shrinks forward and is longer than the rear conical portion 14, a plurality of front cutting grooves 16 that extend from the front end surface to the rear conical portion 14 and do not penetrate the rear end surface, and the rear end surface 16 A plurality of rear cutting grooves 17 extending from the front cone portion 15 to the front cone portion 15 and not penetrating the front end face. A clip claw 18 is formed between each two adjacent front cutting grooves 16, and a clip block 19 is provided on the inner surface of the front end of the clip claw 18 so as to project to the center of the center barrel 13, respectively. The length of the clip block 19 is greater than half of the front cone 15. The clip blocks 19 of the plurality of clip claws 18 surround the clip hole 190 at the front end of the center barrel 13. Among them, the number of the front cutting groove 16 and the rear cutting groove 17 may be 8 or 6 respectively.

図３から分かるように、該従来のコレットチャック１２の前錐部１５の長さがＨであり、クリップブロック１９の長さがｈである。従って、該従来のコレットチャック１２を用いて短いブレード２１のドリル２０を挟持する時（即ち、該ドリル２０のブレード２１が該クリップ孔１９０に貫通設置され、該ドリル２０のブレード柄２２が該クリップ孔１９０後側のセンターバレル１３に貫通設置される時）、該クリップブロック１９の長さが該前錐部１５の半分（それは、前錐部１５の後端に近接する）より大きいので、該ドリル２０のブレード２１は、該コレットチャック１２の前端に僅かな長さＬを突出することしかできない。この短い長さは、短時間の使用後に摩損によりコレットチャック１２の前端に接近して使用することができなくなる可能性があり、更には、加工の深度の制限により使用できなくなるので、該従来のコレットチャック１２は、長いブレード２１のドリル２０を挟持することにしか適用することができず、短いブレード２１のドリル２０に適合することができず、従って、一旦該ドリル２０のブレード２１が一定の長さまで使用されると、使用できなくなり、廃棄しなければならず、該ドリル２０は、実際に依然として少なくとも該クリップブロック１９に挟まれる短くないブレード２１が十分に使用されることができずに浪費され、特に長いブレード２１のドリル２０の使用寿命は、大幅に短縮される。 As can be seen from FIG. 3, the length of the front cone 15 of the conventional collet chuck 12 is H, and the length of the clip block 19 is h. Therefore, when the drill 20 of the short blade 21 is clamped using the conventional collet chuck 12 (that is, the blade 21 of the drill 20 is installed through the clip hole 190, and the blade handle 22 of the drill 20 is Since the length of the clip block 19 is larger than half of the front cone 15 (which is close to the rear end of the front cone 15) when being installed through the center barrel 13 on the rear side of the hole 190, The blade 21 of the drill 20 can only project a slight length L at the front end of the collet chuck 12. This short length may not be able to be used in close proximity to the front end of the collet chuck 12 due to wear after a short period of use, and furthermore, it cannot be used due to processing depth limitations. The collet chuck 12 can only be applied to pinching the drill 20 of the long blade 21 and cannot be adapted to the drill 20 of the short blade 21, so that once the blade 21 of the drill 20 is fixed, When used to length, it becomes unusable and must be discarded, and the drill 20 is actually wasted because at least the non-short blade 21 sandwiched between the clip blocks 19 cannot be fully used. In particular, the service life of the drill 20 with a particularly long blade 21 is greatly reduced.

特開平８−３２３５１６号公報JP-A-8-323516

従来のコレットチャック構造は、長いブレードのドリルにのみ適合でき、短いブレードのドリルに適用できず、浪費及び消耗材料のコストを増加させる問題を招く。 Conventional collet chuck structures can only be adapted to long blade drills and cannot be applied to short blade drills, resulting in increased waste and cost of consumable materials.

本考案は、コレットチャック構造を提供し、それは、センターバレル、後錐部、前錐部、環溝、複数の前切断溝及び複数の後切断溝を含む。そのうち、該センターバレルは、前後端面を貫通し、且つドリルを貫通設置させることができる。該後錐部は、後端に位置し、且つ後方へ向けて漸近的に縮小する。該前錐部は、前端に位置し、且つ前方へ向けて漸近的に縮小し、該前錐部の長さは、該後錐部より大きい。該環溝は、該周面に設けられ、且つ該前後錐部の間に位置する。該複数の前切断溝は、該前錐部から該後錐部に延伸され、それは、該周面から該センターバレルまで貫通し、且つ前端が前端面に延伸して開口を呈し、後端が後端面に貫通せずに密閉状を呈する。各２つの隣り合う前切断溝の間は、クリップ爪をそれぞれ形成し、該クリップ爪の前端の内側面は、それぞれ該センターバレルの中央へ凸設するクリップブロックを有し、該ドリルのブレードを挟ませることができ、且つ該クリップブロックの長さは、該前錐部の半分より小さい。該複数の後切断溝は、該後錐部から該前錐部に延伸し、且つ該周面から該センターバレルに貫通する。該複数の後切断溝は、該複数の前切断溝と交錯設置を呈し、且つ複数の開放溝及び複数の封止溝を含む。該複数の開放溝の前端は、前端面まで貫通せずに密閉状を呈し、後端は、後端面に貫通して開口状を呈し、該複数の封止溝の前後端は、何れも前後端面まで貫通せず、密閉状を呈する。 The present invention provides a collet chuck structure, which includes a center barrel, a rear cone, a front cone, an annular groove, a plurality of front cutting grooves and a plurality of rear cutting grooves. Among them, the center barrel can penetrate the front and rear end faces and can be installed to penetrate the drill. The rear cone portion is located at the rear end and is asymptotically reduced toward the rear. The front cone portion is located at the front end and asymptotically decreases toward the front, and the length of the front cone portion is larger than that of the rear cone portion. The annular groove is provided on the peripheral surface and is located between the front and rear conical portions. The plurality of front cutting grooves extend from the front cone portion to the rear cone portion, which penetrates from the peripheral surface to the center barrel, and the front end extends to the front end surface to form an opening, and the rear end is It shows a sealed shape without penetrating the rear end face. A clip claw is formed between each two adjacent front cutting grooves, and the inner surface of the front end of the clip claw has a clip block projecting toward the center of the center barrel, and the drill blade The clip block can be sandwiched and the length of the clip block is less than half of the front cone. The plurality of rear cutting grooves extend from the rear cone portion to the front cone portion, and penetrate the center barrel from the peripheral surface. The plurality of post-cutting grooves are arranged to intersect with the plurality of front-cutting grooves, and include a plurality of open grooves and a plurality of sealing grooves. The front ends of the plurality of open grooves exhibit a sealed shape without penetrating to the front end surface, the rear ends penetrate through the rear end surface and exhibit an opening shape, and the front and rear ends of the plurality of sealing grooves are both front and rear It does not penetrate to the end face and exhibits a sealed shape.

本考案が提供するコレットチャック構造は、該クリップブロックの長さが該前錐部の半分より小さい設計によって、該コレットチャックが短いブレードのドリルを挟持する時、該ドリルのブレードが該コレットチャックの前端に比較的長い長さを突出でき、特に、該複数の後切断溝及び該複数の前切断溝が交錯設置を呈する設計を利用し、該複数の後切断溝の後端に開口状を呈する開放溝の数量を該前切断溝の数量より少なくさせ、従って、該複数の前切断溝が形成する複数のクリップ爪にこれにより比較的強い剛性を持たせ、相対して、該負数のクリップ爪前端のクリップブロックに比較的大きな支持力を持たせ、挟まれるドリルが研磨又は加工時に偏り、揺動の状況を発生しないようにする。特に、その突出するブレードは、比較的長い時間使用させることができ、該クリップブロックに挟まれるブレードが僅かであることにより、該ドリルが有効利用されることができ、浪費を効率的に減少させ、消耗材料コストを大幅に低減する。 The collet chuck structure provided by the present invention has a design in which the length of the clip block is less than half of the front cone, so that when the collet chuck clamps a short blade drill, the drill blade is connected to the collet chuck. A relatively long length can be projected at the front end, and in particular, the plurality of rear cutting grooves and the plurality of front cutting grooves can be installed in an intersecting manner, and the rear end of the plurality of rear cutting grooves has an opening shape. The number of open grooves is less than the number of the front cut grooves, and thus the plurality of clip claws formed by the plurality of front cut grooves have a relatively strong rigidity, and the negative number of the clip claws A relatively large supporting force is given to the clip block at the front end so that the sandwiched drill is not biased during polishing or processing, and a swinging situation does not occur. In particular, the protruding blade can be used for a relatively long time, and the few blades sandwiched by the clip block allow the drill to be used effectively, effectively reducing waste. , Drastically reduce the cost of consumable materials.

公知のコレットチャックの立体分解説明図である。It is three-dimensional decomposition explanatory drawing of a well-known collet chuck. 公知のコレットチャックの後側面の平面拡大説明図である。It is a plane expansion explanatory view of the back side of a publicly known collet chuck. 公知のコレットチャックの組み合わせ断面拡大説明図である。It is combination sectional expansion explanatory drawing of a well-known collet chuck. 公知の前側面の立体説明図である。It is a three-dimensional explanatory drawing of a known front side surface. 本考案の後側面の立体説明図である。It is a three-dimensional explanatory drawing of the rear side of the present invention. 本考案の後側面の平面拡大説明図である。It is a plane expansion explanatory view of the back side of the present invention. 図６のＡ−Ａ断面の説明図である。It is explanatory drawing of the AA cross section of FIG. 図６のＢ−Ｂ断面の説明図である。It is explanatory drawing of the BB cross section of FIG. 本考案の組み合わせ断面説明図である。It is combination sectional explanatory drawing of this invention.

図４〜図９に示すように、本考案が記載するコレットチャック構造は、センターバレル３０、後錐部４０、前錐部５０、環溝６０、複数の前切断溝７０及び複数の後切断溝８０を含む。 As shown in FIGS. 4 to 9, the collet chuck structure described in the present invention includes a center barrel 30, a rear cone 40, a front cone 50, an annular groove 60, a plurality of front cutting grooves 70, and a plurality of rear cutting grooves. 80.

該センターバレル３０は、前後端面を貫通し、且つドリル２０を貫通設置させることができる。 The center barrel 30 can penetrate the front and rear end faces and can be installed to penetrate the drill 20.

該後錐部４０は、後端に配置され、且つ後方へ向けて漸近的に縮小する。 The rear cone 40 is disposed at the rear end and asymptotically shrinks backward.

該後錐部５０は、前端に配置され、且つ前方へ向けて漸近的に縮小し、該前錐部５０の長さは、該後錐部４０より長い。 The rear cone 50 is disposed at the front end and asymptotically decreases toward the front, and the length of the front cone 50 is longer than that of the rear cone 40.

該環溝６０は、外周面に設けられ、且つ該前後錐部５０，４０の間に位置する。 The annular groove 60 is provided on the outer peripheral surface and is located between the front and rear conical portions 50 and 40.

該複数の前切断溝７０は、該前錐部５０から該後錐部４０に延伸し、それは、外周面から該センターバレル３０まで貫通する。該前切断溝７０の前端は、前端面に延伸して開口状を呈し、後端は、後端面まで貫通せずに密閉状を呈する。各２つの隣り合う前切断溝７０の間は、クリップ爪７１をそれぞれ形成し、該クリップ爪７１の前端の内側面は、それぞれ該センターバレル３０の中央へ凸設するクリップブロック７２を有し、該ドリル２０のブレード２１を挟ませることができ、且つ該クリップブロック７２の長さｈ’は、該前錐部５０の長さＨの半分より小さい（ｈ’＜Ｈ／２）。該複数のクリップ爪７１のクリップブロック７２は、該センターバレル３０の前端においてクリップ孔７３を囲い、該クリップ孔７３は、該ドリル２０のブレード２１を貫通設置させることができ、クリップ孔７３後側のセンターバレル３０は、該ドリル２０のブレード柄２２を貫通設置させることができる。 The plurality of front cutting grooves 70 extend from the front cone 50 to the rear cone 40, which penetrates from the outer peripheral surface to the center barrel 30. The front end of the front cutting groove 70 extends to the front end surface to have an opening shape, and the rear end has a sealed shape without penetrating to the rear end surface. A clip claw 71 is formed between each two adjacent front cutting grooves 70, and the inner surface of the front end of the clip claw 71 has a clip block 72 that protrudes toward the center of the center barrel 30. The blade 21 of the drill 20 can be sandwiched, and the length h ′ of the clip block 72 is smaller than half the length H of the front cone 50 (h ′ <H / 2). The clip blocks 72 of the plurality of clip claws 71 surround the clip hole 73 at the front end of the center barrel 30, and the clip hole 73 can be installed to penetrate the blade 21 of the drill 20. The center barrel 30 can have the blade handle 22 of the drill 20 installed therethrough.

該複数の後切断溝８０は、該後錐部４０から該前錐部５０に延伸し、且つ該周面から該センターバレル３０に貫通する。該複数の後切断溝８０は、該複数の前切断溝７０と交錯設置を呈し、且つ複数の開放溝８１及び複数の封止溝８２を含む。該複数の開放溝８１の前端は、前端面まで貫通せずに密閉状を呈し、後端は、後端面に貫通して開口状を呈する。該複数の封止溝８２の前後端は、何れも前後端面まで貫通せず、密閉状を呈し、即ち、該封止溝８２の後端は、後端面まで切断されず、両側溝壁を接続する接続ブロック８３を有し、それに密閉を形成させる。 The plurality of rear cutting grooves 80 extend from the rear cone 40 to the front cone 50 and penetrate the center barrel 30 from the peripheral surface. The plurality of post-cutting grooves 80 intersect with the plurality of front-cutting grooves 70 and include a plurality of open grooves 81 and a plurality of sealing grooves 82. The front ends of the plurality of open grooves 81 have a sealed shape without penetrating to the front end surface, and the rear end penetrates the rear end surface and has an opening shape. The front and rear ends of the plurality of sealing grooves 82 do not penetrate to the front and rear end faces, and are sealed. That is, the rear ends of the sealing grooves 82 are not cut to the rear end face and connect the groove walls on both sides. A connecting block 83 for forming a hermetic seal.

本考案において、該前切断溝７０及び該後切断溝８０の数量は、それぞれ８つであり、そのうち、該後切断溝８０は、４つの開放溝８１及び４つの封止溝８２を含む。また、該前切断溝７０及び該後切断溝８０の数量は、それぞれ６つであることができ、そのうち、該後切断溝８０は、３つの開放溝８１及び３つの封止溝８２を含む。 In the present invention, the number of the front cutting groove 70 and the rear cutting groove 80 is eight, and the rear cutting groove 80 includes four open grooves 81 and four sealing grooves 82. In addition, the number of the front cutting groove 70 and the rear cutting groove 80 may be six, of which the rear cutting groove 80 includes three open grooves 81 and three sealing grooves 82.

本考案のコレットチャック構造は、該クリップブロック７２の長さｈ’が該前錐部５０の長さＨの半分より小さい構造設計によって、該コレットチャックが短いブレード２１のドリル２０を挟持する時、該ドリル２０のブレード２１が該コレットチャックの前端に比較的長い長さＬ’を突出できる。特に、該複数の後切断溝８０及び該複数の前切断溝７０が交錯設置を呈する設計を利用し、該複数の後切断溝８０の後端に開口状を呈する開放溝８１の数量を該前切断溝７０の数量より少なくさせ、従って、該複数の前切断溝７０が形成する複数のクリップ爪７１にこれにより比較的強い剛性を持たせ、相対して、該負数のクリップ爪７１前端のクリップブロック７２に比較的大きな支持力を持たせ、挟まれるドリル２０が研磨又は加工時に偏り又は揺動の状況を発生しないようにすることができる。特に、その突出するブレード２１は、比較的長い時間使用させることができ、該クリップブロック７２に挟まれるブレード２１（即ち、該コレットチャックの中に位置するブレード２１）が僅かであることにより、該ドリル２０が有効利用されることができ、浪費を効率的に減少させ、消耗材料コストを大幅に低減する。 The collet chuck structure of the present invention has a structure design in which the length h ′ of the clip block 72 is smaller than half of the length H of the front cone 50, so that the collet chuck sandwiches the drill 20 of the short blade 21. The blade 21 of the drill 20 can project a relatively long length L ′ at the front end of the collet chuck. In particular, by utilizing a design in which the plurality of rear cutting grooves 80 and the plurality of front cutting grooves 70 are arranged in a crossing manner, the number of the open grooves 81 having an opening at the rear end of the plurality of rear cutting grooves 80 is set to the front. Accordingly, the plurality of clip claws 71 formed by the plurality of front cut grooves 70 have a relatively strong rigidity, so that the clip of the front end of the negative number of the clip claws 71 is made smaller. The block 72 can be provided with a relatively large supporting force so that the sandwiched drill 20 does not generate a bias or swinging situation during polishing or processing. In particular, the protruding blade 21 can be used for a relatively long time, and the blade 21 sandwiched by the clip block 72 (that is, the blade 21 located in the collet chuck) is small. The drill 20 can be used effectively, reducing waste efficiently and significantly reducing consumable material costs.

以上の実施例による本考案の詳細な説明は本考案の範囲を制限するものではない。本技術に熟知する者が、本考案の範囲内にて行う変更や調整を行っても、本考案の重要な意義は失われず、本考案の範囲に含まれる。 The detailed description of the present invention according to the above embodiments does not limit the scope of the present invention. Even if a person familiar with the present technology makes changes or adjustments within the scope of the present invention, the important significance of the present invention is not lost and is included in the scope of the present invention.

１０固定部材
１１ナット
１２コレットチャック
１３センターバレル
１４後錐部
１５前錐部
１６前切断溝
１７後切断溝
１８クリップ爪
１９クリップブロック
１９０クリップ孔
２０ドリル
２１ブレード
２２ブレード柄
３０センターバレル
４０後錐部
５０前錐部
６０環溝
７０クリップ爪
７２クリップブロック
７３クリップ孔
８０後切断溝
８１開放溝
８２封止溝
８３接続ブロック DESCRIPTION OF SYMBOLS 10 Fixing member 11 Nut 12 Collet chuck 13 Center barrel 14 Rear cone part 15 Front cone part 16 Front cut groove 17 Rear cut groove 18 Clip claw 19 Clip block 190 Clip hole 20 Drill 21 Blade 22 Blade handle 30 Center barrel 40 Rear cone part 50 Front cone 60 Ring groove 70 Clip claw 72 Clip block 73 Clip hole 80 Rear cut groove 81 Open groove 82 Seal groove 83 Connection block

Claims

A center barrel capable of penetrating the front and rear end faces and allowing the drill to penetrate,
A rear cone located at the rear end and asymptotically reduced toward the rear;
A front cone that is located at the front end and asymptotically shrinks forward and is longer than the rear cone;
An annular groove provided on the outer peripheral surface and located between the front and rear conical portions;
The front cone extends from the front cone to the rear cone, penetrates from the outer peripheral surface to the center barrel, and the front end extends to the front end surface to form an opening, and the rear end does not penetrate to the rear end surface and is sealed. A plurality of front cutting grooves, each having a clip claw between two adjacent front cutting grooves, and a clip block protruding from the center barrel on the inner surface of the front end of the clip claw. A plurality of front cutting grooves that can sandwich the blade of the drill and that the length of the clip block is less than half of the front cone,
A plurality of rear cutting grooves extending from the rear cone portion to the front cone portion and penetrating from the outer peripheral surface to the center barrel, wherein the plurality of cutting grooves are installed to intersect with the plurality of front cutting grooves; and Including a plurality of open grooves and a plurality of sealing grooves, the front ends of the plurality of open grooves exhibit a sealed shape without penetrating to the front end surface, and the rear end penetrates the rear end surface to exhibit an open shape, The front and rear ends of the sealing groove are a plurality of post-cutting grooves that are hermetically sealed without penetrating the front and rear end surfaces,
Collet chuck structure including.

The plurality of clip blocks enclose a clip hole at a front end of the center barrel, and the clip hole can penetrate the blade of the drill, and the center barrel behind the clip hole has a blade handle of the drill The collet chuck structure according to claim 1, wherein the collet chuck structure can be installed.

2. The collet chuck structure according to claim 1, wherein a rear end of the sealing groove has a connection block for connecting both side groove walls to form a sealed shape.

The collet chuck structure according to claim 1, wherein the number of the front cutting grooves is eight, the number of the rear cutting grooves is eight, and the rear cutting grooves include four open grooves and four sealing grooves. .

The collet chuck according to claim 1, wherein the number of the front cutting grooves is six, the number of the rear cutting grooves is six, and the rear cutting grooves include three open grooves and three sealing grooves. Construction.