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JP3556599B2 - Core drill - Google Patents
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JP3556599B2 - Core drill - Google Patents

Core drill Download PDF

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Publication number
JP3556599B2
JP3556599B2 JP2001019483A JP2001019483A JP3556599B2 JP 3556599 B2 JP3556599 B2 JP 3556599B2 JP 2001019483 A JP2001019483 A JP 2001019483A JP 2001019483 A JP2001019483 A JP 2001019483A JP 3556599 B2 JP3556599 B2 JP 3556599B2
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Japan
Prior art keywords
drill portion
cylindrical
drill
cylindrical drill
chamfering
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Expired - Fee Related
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JP2001019483A
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Japanese (ja)
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JP2002219707A (en
Inventor
紘一 勝浦
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株式会社 ダイアック
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  • Drilling Tools (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、硬質脆性材料であるガラス板やファインセラミックス等に孔をあけるのに用いるコアドリルに関する。
【0002】
【従来の技術】
自動車のウインドガラス、建築用や家具用のガラス板等に孔をあけるのに用いられるコアドリルとして、モータ等の駆動源につながるシャンクの先端に、ダイヤモンド粉末層からなる刃部を形成したヘッドを有し、このヘッドによりガラス板に穿孔を行う円筒状ドリル部と、該円筒状ドリル部によって穿設された孔の周縁に、穿孔と同時に面取りを施すシーマ部を構成したものが、例えば実公昭60−183157号公報などに提案されている。
【0003】
【発明が解決しようとする課題】
前記従来のコアドリルにあっては、円筒状ドリル部およびシーマ部が一体構造であり、前記円筒状ドリル部およびシーマ部と被穿孔面との間に発生するガラス屑の逃げ場および切削面への冷却水の供給が十分に行われず、従って、前記コアドリルの回転数を低く抑えたり、頻繁にドレッシング作業を行う必要があり、穿孔効率が悪いという問題があった。
【0004】
また、円筒状ドリル部と、該円筒状ドリル部に対して軸方向位置調整自在に面取りドリル部を設けたコアドリルにおいては、前記円筒状ドリル部と前記面取りドリル部との間に形成されている微小間隙(相互に軸方向移動自在にするために必要)の存在によって、面取り面の下端に未研削のバリが残留し、該残留したバリが、その後の処理工程等において、孔内周へのクラックやピッチングの発生原因になる、という問題があった。
【0005】
本発明は、前記のような問題を解決するものであり、円筒状ドリル部と穿設する孔内周との間に、冷却水及びガラス屑を排出する間隙を設け、さらに面取り面の下端に、未研削のバリを残留させないようにして、孔内周へのクラックやチッピングの発生を防止できるコアドリルを、きわめて簡素な構成にて提供することを目的とする。
【0006】
【課題を解決するための手段】
前記目的を達成するために、本発明に係るコアドリルは、シャンクの下端に設けられた円筒状ドリル部と、前記シャンクの軸心に設けられて、前記円筒状ドリル部の円筒内に連通する冷却水孔と前記円筒状ドリル部の外周面に設けられて、該円筒状ドリル部の下端に至る平坦な第1のカット面とを備え、前記円筒状ドリル部の外周に、前記円筒状ドリル部によって穿設された孔の周縁の面取りを行うシーマ部を下端面に持った面取り用ドリル部が軸方向位置調整可能に嵌挿され、該面取り用ドリル部の内周面に、前記第1のカット面に嵌合する第2のカット面が設けられていることを特徴としている。
【0007】
これにより、前記シャンク単独でガラス板等に穿孔を行った場合には、穿孔中に生じるガラス屑を、前記冷却水孔を通して送られる冷却水とともに、前記第1のカット面と孔の内周面との間に生じる間隙を通して、速やかに排出することができる。
【0009】
また、前記円筒状ドリル部の第1のカット面が穿孔された孔内にあるとき、該孔の内周との間にガラス屑を排出させる間隙を作ることができるとともに、さらに、円筒状ドリル部と面取り用ドリル部との微小間隙の存在によって生じるバリの残留を防止し、該バリの残留、前記ガラス屑の滞留等による孔内周へのクラックやチッピングの発生を防止できる。加えて、前記面取り用ドリル部は、前記円筒状ドリル部に対して軸方向位置調整可能であるので、ガラスの厚さに対応した面取りが可能となる。
【0011】
【発明の実施の形態】
以下、本発明の実施の一形態を図について説明する。図1は、本発明のコアドリルの正面図、図2は、図1の縦断面図、図3は、分解図である。各図において、1はモータなどの駆動源に連結されるシャンク、2はシャンク1の下端に一体に設けられた円筒状ドリル部であり、該円筒状ドリル部2の下端部には、ダイヤモンド層等の刃部2aが形成されている。
【0012】
また、前記シャンク1の軸心には、円筒状ドリル部2の円筒内に連通する冷却水孔3が形成されており、孔あけ加工時に供給される冷却水が、この冷却水孔3を通って、下端部の前記刃部2aに供給されるように構成されている。
【0013】
さらに、前記円筒状ドリル部2には、その外周面の一部、図面実施の一形態では、前記円筒状ドリル部2の径方向の対向する2箇所に、該円筒状ドリル部2の下端部の前記刃部2aに至る平坦な第1のカット面6が形成されている。
【0014】
なお、前記構成の円筒状ドリル部2のみでもガラス等に対する穿孔が可能であるが、図面実施の一形態では、前記円筒状ドリル部2の外周に、円筒状の面取り用ドリル部4が嵌挿されて、該面取り用ドリル部4が前記円筒状ドリル部2に対して軸方向位置調整可能にされている。
【0015】
前記円筒状の面取り用ドリル部4は、その内周面に、前記円筒状ドリル部2の前記第1のカット面6に嵌合する平坦な第2のカット面7が設けられ、その下端面に、前記円筒状ドリル2によって穿設された孔8の周縁の面取りを行うダイヤモンド層等のテ−パ−状のシ−マ部4aが形成されている。
【0016】
従って、前記コアドリルの下端部を、図4のA−A線で切断すると、図5に示すように、前記円筒状ドリル部2がそのままの厚みとして表れ、一方、前記コアドリルの下端部を、図4のB−B線で切断すると、図6に示すように、円筒状ドリル部2の前記第1のカット面6が、前記の厚みと異なり薄く表れる。このため、前記円筒状ドリル部2の第1のカット面6と穿設される内径Dの孔8の内周との間には、図6に示す間隙d(平面視では、図4の三日月形状の間隙d)が生じる。
【0017】
なお、前記円筒状ドリル2に対する前記面取りドリル部4の軸方向位置調整は、前記面取り用ドリル部4に螺合された固定ねじ5を締め付け、あるいは緩めて、該固定ねじ5の先端を前記円筒状ドリル2の外周に加圧、あるいは該加圧を解除することによって固定、あるいは該固定の解除を行うことができる。
【0018】
前記構成のコアドリルでは、ガラス板Gに孔あけをする際には、モータ等を動力として回転する回転駆動部(図示せず)に前記シャンク1を装着する。続いて、冷却水を前記シャンク1の冷却水孔3に供給し、前記円筒状ドリル部2を前記回転駆動部によって回転させながら、その下端面を前記ガラス板Gの上面(下面でもよい)に押圧する。
【0019】
その結果、前記ガラス板Gには、図5に示すように、前記円筒状ドリル部2の円弧状部2bの外径に相当する寸法Dの孔8が形成される。同時に、前記冷却水孔3に注入された冷却水は、前記ガラス板Gの切削面に供給され、さらに前記円筒状ドリル部2と前記ガラスGの切削面を通り、切削されたガラス屑とともに、穿設された前記孔8の内周面と前記円筒状ドリル部2の前記第1カット面6との間に生じた前記間隙dから排出される。
【0020】
さらに、図面実施の形態では、前記円筒状ドリル部2に、前記面取り用ドリル部4が嵌挿されているため、前記孔8の穿設完了近くに、前記面取り用ドリル部4の前記シーマ部4aによって、前記孔8の周縁に面取り面9が形成される。
【0021】
前記のごとく、本発明によれば、前記円筒状ドリル部2に前記第1のカット面6を形成したため、実際に穿設される前記孔8の内周面と前記円筒状ドリル2の前記第1のカット面6との間に、前記間隙dを生じさせつつ穿孔が行われ、切削されたガラス屑は、前記間隙dを通って、前記冷却水孔3に供給された冷却水とともに迅速に排出される。
【0022】
さらに、前記円筒状ドリル部2と前記面取り用ドリル部4を相互の軸方向位置調整可能にするために、前記円筒状ドリル部2と前記面取り用ドリル部4間に形成されている微小間隙H(図4)の存在によって、前記面取り面9の下端に残留するバリも、前記面取り用ドリル部4に設けられた前記第2のカット面7が、実際に穿設される前記孔8の内周より内側を通過するため、自動的に除去されて前記間隙dから排出される。
【0023】
また、前記面取り用ドリル部4は、前記固定ねじ5を緩めることにより、前記円筒状ドリル2に対して軸方向位置調整可能とされている。従って、孔あけしようとするガラス板Gの厚さに対応させて、前記円筒状ドリル部2の所定の位置に前記面取り用ドリル部4を移動させて前記固定ねじ5により固定して必要とする面取りを容易に行うことができる。
【0024】
なお、前記実施の形態では、前記第1のカット面6および前記第2のカット面7をそれぞれ二箇所に設けた例を示したが、一箇所または三箇所以上とすることは任意である。また、前記第1のカット面6および前記第2のカット面7は、既存の円筒状ドリル部および面取り用ドリル部にカット加工を施すだけでよいため、本発明のコアドリルを簡単に提供することができる。
【0025】
また、前記の実施の一形態では、コアドリルを、前記円筒状ドリル部2と前記面取り用ドリル部4を一組として穿孔する場合として述べたが、前記第1のカット面6を持った円筒状ドリル部2のみで、ガラス板Gに対する穿孔が可能であり、したがって、前記孔8の周縁の面取りが不要な場合には、前記円筒状ドリル部2だけで穿孔を行えばよい。
【0026】
【発明の効果】
以上のように、本発明によれば、円筒状ドリル部の外周面に、該円筒状ドリル部の下端に至る平坦な第1のカット面を設けたので、この円筒状ドリル部のみの穿孔において、前記円筒状ドリル部の前記第1のカット面と穿孔中の孔の内周面との間に生じる間隙から切削されたガラス屑が供給された冷却水とともに迅速に排出される。
【0027】
さらに、前記円筒状ドリル部の外周に前記面取り用ドリル部を相互に軸方向位置調整可能に嵌挿し、同時に面取りを行う穿孔においては、さらに、前記円筒状ドリル部と前記面取りドリル部間の微小空間の存在によって残留するバリが、前記面取りドリル部に設けられた第2のカット面が、実際に穿設される孔の内周より内側を通過するため、自動的に除去され、従って、前記ガラス屑、バリ等による孔内周へのクラックやチッピングの発生を有効に防止できる。
【0028】
また、前記面取り用ドリル部が、前記円筒状ドリル部に対して軸方向位置調整可能であり、任意の軸方向位置で固定が可能であるので、ガラスの厚さに対応させた面取りが容易である。
【図面の簡単な説明】
【図1】本発明の実施の一形態に係るコアドリルの正面図である。
【図2】図1に示すコアドリルの縦断面図である。
【図3】図1に示すコアドリルの分解図である。
【図4】図1に示すコアドリルの拡大平面図である。
【図5】図4のA−A線断面図である。
【図6】図4のB−B線断面図である。
【符号の説明】
1 シャンク
2 円筒状ドリル部
2a 刃部
3 冷却水孔
4 面取り用ドリル部
4a シーマ部
5 固定ねじ
6 第1のカット面
7 第2のカット面
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a core drill used for drilling holes in a hard brittle material such as a glass plate or fine ceramics.
[0002]
[Prior art]
As a core drill used to drill holes in automotive wind glass, architectural and furniture glass plates, etc., it has a head with a cutting edge made of a diamond powder layer at the tip of a shank connected to a drive source such as a motor. A cylindrical drill portion for drilling a glass plate with the head and a seamer portion for chamfering the periphery of the hole drilled by the cylindrical drill portion at the same time as the drilling are disclosed in, for example, Japanese Utility Model Publication No. No. 183157.
[0003]
[Problems to be solved by the invention]
In the conventional core drill, the cylindrical drill portion and the seamer portion are of an integral structure, and the glass drill generated between the cylindrical drill portion and the seamer portion and the surface to be drilled is cooled to a relief area and a cutting surface. Water was not supplied sufficiently, and therefore, the number of rotations of the core drill had to be kept low, and frequent dressing work had to be performed, resulting in poor drilling efficiency.
[0004]
In a core drill provided with a cylindrical drill portion and a chamfered drill portion capable of adjusting the axial position with respect to the cylindrical drill portion, the core drill is formed between the cylindrical drill portion and the chamfered drill portion. Due to the existence of the minute gap (necessary to allow mutual mutual movement in the axial direction), ungrinded burrs remain at the lower end of the chamfered surface. There is a problem that it causes cracks and pitching.
[0005]
The present invention has been made to solve the above-described problems, and a gap for discharging cooling water and glass chips is provided between a cylindrical drill portion and an inner periphery of a hole to be drilled. It is another object of the present invention to provide a core drill having an extremely simple configuration capable of preventing the generation of cracks and chipping on the inner periphery of a hole without leaving unburred burrs.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a core drill according to the present invention includes a cylindrical drill portion provided at a lower end of a shank, and a cooling device provided at an axis of the shank and communicating with a cylinder of the cylindrical drill portion. and water holes, provided on the outer peripheral surface of the cylindrical drill portion, and a flat first cutting surface extending to the lower end of the cylindrical drill portion, the outer periphery of the cylindrical drill portion, the cylindrical A chamfering drill portion having a seamer portion for chamfering a peripheral edge of a hole formed by the drill portion on a lower end surface is inserted so as to be adjustable in an axial direction, and the inner peripheral surface of the chamfering drill portion has It is characterized in that a second cut surface that fits into the first cut surface is provided.
[0007]
Thus, when the shank is perforated on a glass plate or the like by itself, the glass chips generated during perforation are removed together with the cooling water sent through the cooling water hole and the first cut surface and the inner peripheral surface of the hole. Can be quickly discharged through a gap formed between
[0009]
In addition , when the first cut surface of the cylindrical drill portion is in the bored hole, a gap for discharging glass chips can be formed between the first cut surface and the inner periphery of the bore. It is possible to prevent the burrs remaining due to the existence of the minute gap between the drilling portion and the chamfering drill portion, and to prevent cracks and chipping from occurring in the inner periphery of the hole due to the burrs remaining and the stagnation of the glass chips. In addition, since the position of the chamfering drill portion can be adjusted in the axial direction with respect to the cylindrical drill portion, chamfering according to the thickness of the glass can be performed.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a core drill of the present invention, FIG. 2 is a longitudinal sectional view of FIG. 1, and FIG. 3 is an exploded view. In each of the figures, reference numeral 1 denotes a shank connected to a driving source such as a motor, and 2 denotes a cylindrical drill portion integrally provided at a lower end of the shank 1. The lower end of the cylindrical drill portion 2 includes a diamond layer. Is formed.
[0012]
A cooling water hole 3 communicating with the inside of the cylinder of the cylindrical drill portion 2 is formed in the shaft center of the shank 1, and cooling water supplied during drilling passes through the cooling water hole 3. And is supplied to the blade portion 2a at the lower end.
[0013]
Further, the cylindrical drill portion 2 has a part of an outer peripheral surface, and in one embodiment in the drawing, two lower ends of the cylindrical drill portion 2 at radially opposite positions of the cylindrical drill portion 2. A flat first cut surface 6 reaching the blade portion 2a is formed.
[0014]
It is to be noted that the cylindrical drill portion 2 having the above-described configuration can be used for drilling through glass or the like, but in the embodiment shown in the drawings, a cylindrical chamfering drill portion 4 is fitted around the cylindrical drill portion 2. Then, the position of the chamfering drill portion 4 can be adjusted in the axial direction with respect to the cylindrical drill portion 2.
[0015]
The cylindrical chamfering drill portion 4 is provided on its inner peripheral surface with a flat second cut surface 7 fitted to the first cut surface 6 of the cylindrical drill portion 2, and a lower end surface thereof. Further, a taper-shaped seam portion 4a such as a diamond layer for chamfering the periphery of the hole 8 formed by the cylindrical drill 2 is formed.
[0016]
Therefore, when the lower end portion of the core drill is cut along the line AA in FIG. 4, the cylindrical drill portion 2 appears as it is as shown in FIG. 5, while the lower end portion of the core drill is shown in FIG. When cut along the line BB of FIG. 4, the first cut surface 6 of the cylindrical drill portion 2 appears thinner than the above-described thickness, as shown in FIG. Therefore, between the first cut surface 6 of the cylindrical drill portion 2 and the inner periphery of the bore 8 having the inner diameter D, a gap d shown in FIG. A gap d) in the shape results.
[0017]
The axial position adjustment of the chamfering drill portion 4 with respect to the cylindrical drill 2 is performed by tightening or loosening a fixing screw 5 screwed to the chamfering drill portion 4, and fixing the tip of the fixing screw 5 to the cylindrical drill. Pressing or releasing the pressurization on the outer periphery of the drill 2 can fix or release the fixation.
[0018]
In the core drill having the above configuration, when drilling a hole in the glass plate G, the shank 1 is attached to a rotation drive unit (not shown) that rotates by using a motor or the like as power. Subsequently, cooling water is supplied to the cooling water hole 3 of the shank 1, and the lower end surface thereof is placed on the upper surface (or lower surface) of the glass plate G while rotating the cylindrical drill portion 2 by the rotation driving portion. Press.
[0019]
As a result, as shown in FIG. 5, a hole 8 having a dimension D corresponding to the outer diameter of the arc-shaped portion 2b of the cylindrical drill portion 2 is formed in the glass plate G, as shown in FIG. At the same time, the cooling water injected into the cooling water holes 3 is supplied to the cut surface of the glass plate G, and further passes through the cylindrical drill portion 2 and the cut surface of the glass G, and together with the cut glass chips, The fluid is discharged from the gap d generated between the inner peripheral surface of the bored hole 8 and the first cut surface 6 of the cylindrical drill portion 2.
[0020]
Furthermore, in the embodiment shown in the drawings, the chamfering drill portion 4 is inserted into the cylindrical drill portion 2, so that the seamer portion of the chamfering drill portion 4 is near the completion of the drilling of the hole 8. A chamfered surface 9 is formed on the periphery of the hole 8 by 4a.
[0021]
As described above, according to the present invention, since the first cut surface 6 is formed in the cylindrical drill portion 2, the inner peripheral surface of the hole 8 actually drilled and the first cut surface 6 of the cylindrical drill 2 are formed. Perforation is performed while the gap d is formed between the cut surface 6 and the first cut surface 6, and the cut glass dust quickly passes through the gap d together with the cooling water supplied to the cooling water hole 3. Is discharged.
[0022]
Further, in order to adjust the axial position of the cylindrical drill portion 2 and the chamfering drill portion 4 with each other, a minute gap H formed between the cylindrical drill portion 2 and the chamfering drill portion 4. Due to the presence of (FIG. 4), burrs remaining at the lower end of the chamfered surface 9 are also removed from the holes 8 where the second cut surfaces 7 provided on the chamfered drill portion 4 are actually drilled. Since it passes inside the circumference, it is automatically removed and discharged from the gap d.
[0023]
Further, the position of the chamfering drill portion 4 can be adjusted in the axial direction with respect to the cylindrical drill 2 by loosening the fixing screw 5. Therefore, it is necessary to move the chamfering drill portion 4 to a predetermined position of the cylindrical drill portion 2 according to the thickness of the glass plate G to be drilled, and fix the chamfering drill portion 4 with the fixing screw 5. Chamfering can be easily performed.
[0024]
Note that, in the above-described embodiment, an example in which the first cut surface 6 and the second cut surface 7 are provided at two locations is shown, but it is optional to provide one or three or more locations. Further, since the first cut surface 6 and the second cut surface 7 need only be formed by cutting existing cylindrical drill portions and chamfering drill portions, the core drill of the present invention can be easily provided. Can be.
[0025]
Further, in the above-described embodiment, the core drill is described as a case where the cylindrical drill portion 2 and the chamfering drill portion 4 are drilled as a set, but the cylindrical drill having the first cut surface 6 is formed. Drilling of the glass plate G is possible only with the drill portion 2. Therefore, when chamfering of the peripheral edge of the hole 8 is unnecessary, it is sufficient to perform drilling only with the cylindrical drill portion 2.
[0026]
【The invention's effect】
As described above, according to the present invention, the outer peripheral surface of the cylindrical drill portion is provided with the flat first cut surface reaching the lower end of the cylindrical drill portion. The glass chips cut from the gap formed between the first cut surface of the cylindrical drill portion and the inner peripheral surface of the hole being drilled are quickly discharged together with the supplied cooling water.
[0027]
Further, in the drilling in which the chamfering drill portions are inserted into the outer periphery of the cylindrical drill portion so as to be able to adjust the axial position with respect to each other and simultaneously chamfering, furthermore, a minute gap between the cylindrical drill portion and the chamfering drill portion is provided. The burrs remaining due to the presence of the space are automatically removed because the second cut surface provided in the chamfer drill portion passes inside the inner periphery of the hole actually drilled. Cracks and chipping on the inner periphery of the hole due to glass chips, burrs, and the like can be effectively prevented.
[0028]
Further, since the chamfering drill portion is axially adjustable with respect to the cylindrical drill portion and can be fixed at an arbitrary axial position, it is easy to chamfer the glass thickness. is there.
[Brief description of the drawings]
FIG. 1 is a front view of a core drill according to an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of the core drill shown in FIG.
FIG. 3 is an exploded view of the core drill shown in FIG.
FIG. 4 is an enlarged plan view of the core drill shown in FIG.
FIG. 5 is a sectional view taken along line AA of FIG. 4;
FIG. 6 is a sectional view taken along line BB of FIG. 4;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shank 2 Cylindrical drill part 2a Blade part 3 Cooling water hole 4 Chamfering drill part 4a Seamer part 5 Fixing screw 6 First cut surface 7 Second cut surface

Claims (1)

シャンクの下端に設けられた円筒状ドリル部と、前記シャンクの軸心に設けられて、前記円筒状ドリル部の円筒内に連通する冷却水孔と、前記円筒状ドリル部の外周面に設けられて、該円筒状ドリル部の下端に至る平坦な第1のカット面とを備え、前記円筒状ドリル部の外周に、前記円筒状ドリル部によって穿設された孔の周縁の面取りを行うシーマ部を下端面に持った面取り用ドリル部が軸方向位置調整可能に嵌挿され、該面取り用ドリル部の内周面に、前記第1のカット面に嵌合する第2のカット面が設けられていることを特徴とするコアドリル。A cylindrical drill portion provided at a lower end of the shank; a cooling water hole provided at an axis of the shank and communicating with a cylinder of the cylindrical drill portion; and a cooling water hole provided on an outer peripheral surface of the cylindrical drill portion. Te, and a flat first cutting surface extending to the lower end of the cylindrical drill portion, the outer periphery of the cylindrical drill unit performs chamfering the peripheral edge of the hole formed by the cylindrical drill portion CIMA A chamfered drill portion having a lower end portion is fitted and inserted so as to be axially adjustable, and a second cut surface fitted to the first cut surface is provided on an inner peripheral surface of the chamfer drill portion. Core drill characterized by being used .
JP2001019483A 2001-01-29 2001-01-29 Core drill Expired - Fee Related JP3556599B2 (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
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JP3556599B2 true JP3556599B2 (en) 2004-08-18

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Cited By (1)

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KR101487603B1 (en) * 2013-06-26 2015-01-29 김용성 Core drill for glass boring that sliding seamer is equiped

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CN100418682C (en) * 2004-01-16 2008-09-17 旭荣研磨加工株式会社 Drill for step hole formation
RU2365499C2 (en) * 2005-01-12 2009-08-27 Кабусики Кайся Миянага Water supply device for core drill
JP4693592B2 (en) * 2005-10-28 2011-06-01 日本碍子株式会社 Drilling tool
KR101727404B1 (en) * 2015-10-28 2017-04-14 최태섭 Drill for Metal Pipe Drilling
NL2018062B1 (en) * 2016-12-23 2018-07-02 Toproc A G Quick change tool
JP7157624B2 (en) * 2018-10-23 2022-10-20 株式会社ディスコ core drill
CN115781297A (en) * 2022-11-18 2023-03-14 丰县飞洋金属制品有限公司 Metal sheet reaming device for machine-building

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101487603B1 (en) * 2013-06-26 2015-01-29 김용성 Core drill for glass boring that sliding seamer is equiped

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