JPH1148015A - Drill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drill which can be used until the cutting length becomes considerably short and which can make accurate holes even in a thick work. SOLUTION: In a drill which is attached to a driller such as a drilling machine, and rotationally driven to drill holes in a member to be drilled, a drill body 10 having a cutting edge at the tip and a spiral cutting edge on the outer peripheral surface, and holders 20, 22 to be attached to a driller, are separately formed and detachably screwed in each other. The length of the holders can be chosen according to the change in the length of the drill body due to regrinding. The screw for screwing up the drill and the holder is one which can be screwed in by the rotation of the driller.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明はドリルに関し、特に
刃長が短くなるまで使用でき、しかも厚いワークに対し
ても正確な穴をあけられるようにしたドリルに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drill, and more particularly, to a drill that can be used until the blade length is reduced and that can accurately drill a thick workpiece.

【０００２】[0002]

【従来の技術】ワークに穴あけを行う場合、ボール盤や
マシニングセンター等の汎用穴あけ機械、専用穴あけ機
械を用い、ドリルで穴あけを行うことが多い。現在使用
されているドリルは図３に示されるように、先端にのみ
刃を、外周面に螺旋状の切刃を有するドリル本体５０、
穴あけ機械に取付けられるホルダー部５１及び両者の間
に設けられる柄５２から構成されている。2. Description of the Related Art In the case of drilling a workpiece, a general-purpose drilling machine such as a drilling machine or a machining center or a dedicated drilling machine is used to drill a hole in many cases. As shown in FIG. 3, a currently used drill has a drill body 50 having a blade at a tip only and a spiral cutting blade on an outer peripheral surface.
It is composed of a holder 51 attached to a drilling machine and a handle 52 provided between the two.

【０００３】通常、ドリル本体５０の先端のみ刃はシン
ニングを行って切削抵抗を小さくし、ワークへの喰い込
みを確保することが行われているが、多数のワークに穴
あけを行った場合、ドリル先端ののみ刃が磨耗してワー
クへの喰い込み性能が劣ってくることから、先端のみ刃
を再研磨することが行われる。Normally, only the cutting edge of the drill body 50 is thinned to reduce the cutting resistance and secure biting into the work. However, when a large number of works are drilled, a drill is formed. Since only the tip blade is worn and the biting performance into the work is deteriorated, re-polishing of the tip only blade is performed.

【０００４】[0004]

【発明が解決しようとする課題】ところで、上述のドリ
ル先端の再研磨は理論的にはドリル本体５０の切刃のあ
るところ、即ちドリル本体５０の根元まで可能である
が、図４に示されるように、ドリル本体５０の刃長Ｌ0
が短くなって穴あけに寄与するドリルの有効長さがワー
ク６０の厚みＬ以下になると、ドリルがワーク６０を貫
通できないことから、ドリルの有効長さがワーク６０の
厚みＬ以下になるまで再研磨することはできない。その
結果、従来は穴あけを行うべきワーク６０が厚い場合に
はドリル本体５０に大部分の切刃を残したままで使用で
きなくなるという問題があった。By the way, the above-mentioned re-grinding of the tip of the drill can theoretically be performed at the place where the cutting edge of the drill body 50 is present, that is, up to the root of the drill body 50, but is shown in FIG. Thus, the blade length L0 of the drill body 50
When the effective length of the drill contributing to drilling becomes shorter than the thickness L of the work 60, the drill cannot penetrate the work 60. Therefore, re-grinding is performed until the effective length of the drill becomes less than the thickness L of the work 60. I can't. As a result, conventionally, when the work 60 to be drilled is thick, there is a problem that the drill body 50 cannot be used with most of the cutting edges remaining.

【０００５】これに対し、ドリルの柄を長くする方法が
提案されるが、ドリルの全長が長くなると、穴あけ中に
ドリルの振れが起こって穴径が大きくなったり、ドリル
の曲がりが起こったりする。また、穴あけ機械のドリル
の送りストロークにも限度があり、ドリルの全長が長い
新品の時には使用できないこともある。On the other hand, a method of increasing the length of a drill handle has been proposed. However, if the total length of the drill is long, the drill will run out during drilling and the hole diameter will increase, or the drill will bend. . In addition, the feed stroke of the drill of the drilling machine is limited, and the drill may not be used when the drill has a long overall length.

【０００６】本発明はかかる問題点に鑑み、刃長が短く
なるまで使用でき、しかも厚いワークに対しても正確な
穴をあけることのできるようにしたドリルを提供するこ
とを課題とする。SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a drill which can be used until the blade length is reduced, and which can accurately drill a thick workpiece.

【０００７】[0007]

【課題を解決するための手段】そこで、本発明に係るド
リルは、ボール盤等の穴あけ機械に取付けられ、回転駆
動されてワークに穴をあけるドリルにおいて、先端にの
み刃を、外周面に螺旋状の切刃を各々有するドリル本体
と、上記穴あけ機械に取付けられるホルダーとが別体に
形成されて相互に着脱可能に螺合されており、上記ドリ
ル本体の再研磨による長さの変化に応じて上記ホルダー
の長さを選択可能となしたことを特徴とする。Accordingly, a drill according to the present invention is mounted on a drilling machine such as a drilling machine and is driven to rotate to form a hole in a work. The drill body each having a cutting edge and a holder attached to the drilling machine are formed separately and screwed removably to each other, and according to a change in length due to re-grinding of the drill body. The length of the holder can be selected.

【０００８】本発明の特徴の１つはドリル本体とホルダ
ーを別体にし、ドリル本体の長さに応じてホルダーの長
さを選択できるようにした点にある。これにより、ドリ
ル本体を再研磨して刃長が短くなってもホルダーの長さ
を選択して適切なドリル有効長さに設定できるばかりで
なく、ボール盤等のドリルの送りストロークとの関係で
使用が制限されることもない。また、従来のように柄を
長くしていないので、穴あけ中にドリルの振れが起こっ
て穴径が大きくなったり、ドリルの曲がりが起こったり
することはなく、正確な穴あけができる。One of the features of the present invention is that the drill body and the holder are separated, and the length of the holder can be selected according to the length of the drill body. As a result, even if the drill body is re-ground and the blade length is shortened, not only can the holder length be selected and the appropriate drill effective length can be set, but it can also be used in relation to the feed stroke of drills such as drilling machines. Is not restricted. Further, since the handle is not elongated as in the conventional case, the drill does not run out during drilling, so that the hole diameter does not increase and the drill does not bend. Therefore, accurate drilling can be performed.

【０００９】ドリルには柄のある形式と、柄のない形式
とがある。柄のない形式の場合にはホルダーをドリル本
体に直接螺合させればよい。他方、柄のある形式の場
合、柄とホルダーとを螺合させればよい。即ち、本発明
に係るドリルは、ボール盤等の穴あけ機械に取付けら
れ、回転駆動されて被穿孔部材に穴をあけるドリルにお
いて、ほぼ円柱状をなし、その外周面に螺旋状の切刃が
形成され、回転にて穴を穿設するドリル本体と、該ドリ
ル本体の後端に一体に形成され、その後端部分に雄ねじ
又は雌ねじが形成された柄と、上記ドリル本体とは別体
に形成され、相互に異なる長さを有し、先端部分に上記
柄の雄ねじ又は雌ねじと螺合しうる雌ねじ又は雄ねじが
形成され、上記穴あけ機械に上記ドリル本体の長さに応
じて選択的に取付けられる少なくとも２本のホルダーと
を備えたことを特徴とする。There are two types of drills, one with a handle and the other without a handle. In the case of a type without a handle, the holder may be directly screwed into the drill body. On the other hand, in the case of a type having a handle, the handle and the holder may be screwed together. That is, the drill according to the present invention is attached to a drilling machine such as a drilling machine, and is a rotary drill that drills a hole in a member to be drilled, has a substantially cylindrical shape, and has a spiral cutting edge formed on an outer peripheral surface thereof. A drill body for drilling a hole by rotation, a handle integrally formed at the rear end of the drill body, and a male or female screw formed at the rear end portion, and the drill body is formed separately, At least two female threads or male threads having different lengths and capable of being screwed with the male or female threads of the handle at the tip portion and selectively attached to the drilling machine according to the length of the drill body. And a book holder.

【００１０】また、ドリルの回転によって柄とホルダー
の雄ねじ及び雌ねじの螺合が外れるとドリル本来の機能
を発揮できず、好ましくない。そこで、柄及びホルダー
の雄ねじ及び雌ねじは穴あけ機械の回転によって螺合し
うるねじとするのがよい。Further, if the male screw and the female screw of the handle and the holder are disengaged by the rotation of the drill, the original function of the drill cannot be exhibited, which is not preferable. Therefore, it is preferable that the male screw and the female screw of the handle and the holder are screws that can be screwed together by rotation of the drilling machine.

【００１１】さらに、ドリル本体を最短まで再研磨して
も使用できるように、ホルダーのうちの最長のものは最
短となったドリル本体と組み合わされて厚いワークに対
するドリル有効長さを確保しうる長さに設定するのが好
ましい。Furthermore, the longest one of the holders is combined with the shortest drill body so that the drill body can be used even if the drill body is polished to the shortest length, so that the effective length of the drill for a thick work can be ensured. It is preferable to set the value to

【００１２】[0012]

【作用及び発明の効果】本発明によれば、ドリル本体の
先端が磨耗し、これを再研磨していって刃長が短くなっ
た場合、ドリル本体からホルダーを外し、適切な長さの
ホルダーを選択してドリル本体に螺合させることによっ
て適切なドリル有効長さに設定できる結果、ドリル本体
の根元まで再研磨して使用することができる。しかも、
ドリル自体の長さは従来と同じにできるので、ドリル長
さがボール盤等のドリルの送りストロークを越える長さ
になることがない。According to the present invention, when the tip of the drill body is worn and polished again and the blade length is shortened, the holder is removed from the drill body and a holder of an appropriate length is removed. As a result, the effective drill length can be set to an appropriate value by screwing the drill body to the drill body. As a result, the base of the drill body can be re-ground and used. Moreover,
Since the length of the drill itself can be made the same as the conventional one, the length of the drill does not exceed the feed stroke of the drill such as a drilling machine.

【００１３】また、ホルダーの長さを選択できるように
し、柄自体の長さは従来と同じにできるので、穴あけ中
にドリルの振れや曲がりが起こることはなく、正確な穴
あけができる。Further, since the length of the holder can be selected and the length of the handle itself can be made the same as that of the conventional case, the drill does not run out or bend during drilling, and accurate drilling can be performed.

【００１４】[0014]

【発明の実施の形態】以下、本発明を添付図面に示す具
体例に基づいて説明する。図１及び図２は本発明のドリ
ルの好ましい実施形態を示す。本例のドリルはドリル本
体１０と長さの異なる２本のホルダー２０、２２との組
合せから構成されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to specific examples shown in the accompanying drawings. 1 and 2 show a preferred embodiment of the drill of the present invention. The drill according to the present embodiment includes a combination of a drill body 10 and two holders 20 and 22 having different lengths.

【００１５】ドリル本体１０は全体としてぼほ円柱状を
なし、その外周面には螺旋状に切刃が形成され、先端に
はのみ刃が形成され、のみ刃はシンニングされている。
また、ドリル本体１０の後端には小径の柄１１が一体に
形成され、該柄１１の後端部分の外周面には雄ねじを有
する雄ねじ部１２が一体に形成されている。The drill body 10 has a substantially cylindrical shape as a whole, and has a spiral cutting blade formed on the outer peripheral surface thereof, a blade formed only at the tip, and a thin blade is thinned.
A small-diameter handle 11 is integrally formed on the rear end of the drill body 10, and a male screw portion 12 having a male screw is integrally formed on the outer peripheral surface of the rear end portion of the handle 11.

【００１６】他方、２つのホルダー２０、２２はともに
ボール盤等の穴あけ機械のチャック等の取付部に取付け
られる形状をなし、該ホルダー２０、２２の先端部分に
は柄１１の雄ねじ部１２と螺合しうる雌ねじ２１、２３
が形成されている。On the other hand, the two holders 20 and 22 are both shaped to be attached to a mounting portion such as a chuck of a drilling machine such as a drilling machine, and the leading ends of the holders 20 and 22 are screwed with the male screw portion 12 of the handle 11. Female screw 21, 23
Are formed.

【００１７】また、ホルダー２０、２２は相互に異なる
長さを有し、長いホルダー２０はドリル本体１０が根元
まで再研磨されて最短となった時にこれと組み合わされ
て厚いワーク６０に対するドリル有効長さを確保しうる
長さに設定され、短いホルダー２２は新品のドリル本体
１０と組み合わして使用されてもボール盤等のドリルの
送りストロークを越えない長さに設定されている。Further, the holders 20 and 22 have different lengths from each other, and the long holder 20 is combined with the drill body 10 when the drill body 10 is polished to the root and becomes the shortest, so that the effective drill length for the thick work 60 is increased. The short holder 22 is set to a length that does not exceed the feed stroke of a drill such as a drilling machine even when used in combination with a new drill body 10.

【００１８】ドリル本体１０が新品の場合、図２の(a)
に示されるように、短いホルダー２２と組合せて使用す
るが、ドリル本体１０が十分な長さを有するので、全体
として適切なドリル有効長さとなり、厚いワーク６０に
対しても確実に穴あけを行うことができ、又ドリル全長
が長くなりすぎることがないので、ボール盤等の送りス
トロークとの関係で使用を制限されることもない。When the drill body 10 is new, FIG.
Is used in combination with the short holder 22, as shown in FIG. 5, the drill body 10 has a sufficient length, so that an appropriate effective drill length is obtained as a whole and the thick workpiece 60 is reliably drilled. In addition, since the total length of the drill does not become too long, the use of the drill is not restricted in relation to the feed stroke of a drilling machine or the like.

【００１９】ドリル本体１０の先端の再研磨が繰り返さ
れてドリル本体１０の長さが短くなると、図２の(b) に
示されるように、長いホルダー２０と組合せて使用す
る。すると、ホルダー２０が十分な長さを有するので、
ドリル本体１０が短いにもかかわらず、ドリル全体とし
ては適切かつ十分なドリル有効長さとなり、厚いワーク
６０に対しても確実に穴あけを行うことができる。その
結果、ドリル本体１０は再研磨によって十分に短くなる
まで使用することができる。When the length of the drill body 10 is shortened due to repeated re-grinding of the tip of the drill body 10, it is used in combination with a long holder 20, as shown in FIG. 2 (b). Then, since the holder 20 has a sufficient length,
Although the drill main body 10 is short, the effective length of the drill as a whole is appropriate and sufficient, and the drilling can be reliably performed even on the thick workpiece 60. As a result, the drill body 10 can be used until it becomes sufficiently short by re-grinding.

【図面の簡単な説明】[Brief description of the drawings]

【図１】 本発明に係るドリルの好ましい実施形態を示
す図である。FIG. 1 is a view showing a preferred embodiment of a drill according to the present invention.

【図２】 上記ドリルの新品時(a) 及び短く再研磨した
時(b) における使用方法を示す図である。FIG. 2 is a diagram showing how to use the drill when it is new (a) and when it is polished shortly (b).

【図３】 従来のドリルを示す図である。FIG. 3 is a view showing a conventional drill.

【図４】 発明が解決しようとする課題を説明するため
の図である。FIG. 4 is a diagram for explaining a problem to be solved by the invention.

【符号の説明】[Explanation of symbols]

１０ ドリル本体 １１ 柄 １２ 雄ねじ ２０ 長いホルダー ２１ 雌ねじ ２２ 短いホルダー ２３ 雌ねじ ６０ 被穿孔部材 DESCRIPTION OF SYMBOLS 10 Drill main body 11 Handle 12 Male screw 20 Long holder 21 Female screw 22 Short holder 23 Female screw 60 Drilled member

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 ボール盤等の穴あけ機械に取付けられ、
回転駆動されてワークに穴をあけるドリルにおいて、 先端にのみ刃を、外周面に螺旋状の切刃を各々有するド
リル本体と、上記穴あけ機械に取付けられるホルダーと
が別体に形成されて相互に着脱可能に螺合されており、
上記ドリル本体の再研磨による長さの変化に応じて上記
ホルダーの長さを選択可能となしたことを特徴とするド
リル。Claims: 1. It is attached to a drilling machine such as a drilling machine,
In a drill driven to rotate and drill a hole in a work, a drill body having a blade only at a tip and a helical cutting blade on an outer peripheral surface, and a holder attached to the drilling machine are formed separately and mutually separated. It is screwed detachably,
A drill characterized in that the length of the holder can be selected according to a change in length due to re-grinding of the drill body. 【請求項２】 ボール盤等の穴あけ機械に取付けられ、
回転駆動されて被穿孔部材に穴をあけるドリルにおい
て、 ほぼ円柱状をなし、その先端にのみ刃が、外周面に螺旋
状の切刃が各々形成され、回転にて穴を穿設するドリル
本体と、 該ドリル本体の後端に一体に形成され、その後端部分に
雄ねじ又は雌ねじが形成された柄と、 上記ドリル本体とは別体に形成され、相互に異なる長さ
を有し、先端部分に上記柄の雄ねじ又は雌ねじと螺合し
うる雌ねじ又は雄ねじが形成され、上記穴あけ機械に上
記ドリル本体の再研磨による長さの変化に応じて選択的
に取付けられる少なくとも２本のホルダーとを備えたこ
とを特徴とするドリル。2. It is attached to a drilling machine such as a drilling machine,
In a drill that is driven to rotate and drills a hole in a member to be drilled, the drill body has a substantially cylindrical shape, a blade is formed only at the tip, and a helical cutting blade is formed on the outer peripheral surface, and the hole is drilled by rotation. A handle formed integrally with a rear end of the drill body and having a male screw or a female screw formed at a rear end thereof; and a drill body formed separately from the drill body and having different lengths from each other. And at least two holders which are formed with a female screw or a male screw which can be screwed with the male screw or the female screw of the handle, and which are selectively attached to the drilling machine in accordance with a change in length due to re-grinding of the drill body. A drill characterized in that: 【請求項３】 上記柄及びホルダーの雄ねじ及び雌ねじ
が上記穴あけ機械の回転によって螺合しうるねじである
請求項２記載のドリル。3. The drill according to claim 2, wherein the male screw and the female screw of the handle and the holder are screws that can be screwed together by rotation of the drilling machine.