JP6597924B1 - Drilling bit - Google Patents

Drilling bit Download PDF

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JP6597924B1
JP6597924B1 JP2019059538A JP2019059538A JP6597924B1 JP 6597924 B1 JP6597924 B1 JP 6597924B1 JP 2019059538 A JP2019059538 A JP 2019059538A JP 2019059538 A JP2019059538 A JP 2019059538A JP 6597924 B1 JP6597924 B1 JP 6597924B1
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cutting edge
side ridge
tip
main body
depression
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央 高遠
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Tungaloy Corp
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Abstract

【課題】軟岩層を効率的に削ることができる掘削ビットを提供すること。【解決手段】二つ以上の板状の切れ刃チップ２０と、切れ刃チップ２０を固定するための略円筒形状の本体部１０と、を備え、各切れ刃チップ２０に対して工具回転方向前方に空間を形成するための第１の窪み１２と、第１の窪み１２に連続する第２の窪み１３と、先端視したとき、切れ刃チップ２０の一つは、本体部１０の回転中心軸線を越えて配置されており、第１の窪み１２は各切れ刃チップ２０のすくい面の一部に隣接し、なおかつ本体部１０の先端に向って開放されて形成され、第２の窪み１３は本体部１０の先端に向って開放されて形成され、先端視したとき、第１の窪み１２および第２の窪み１３が占める割合が、工具径によって規定される領域に対して６５％以上７５％以下である掘削ビット１００。【選択図】 図２An excavation bit capable of efficiently cutting a soft rock layer is provided. SOLUTION: Two or more plate-shaped cutting edge tips 20 and a substantially cylindrical main body 10 for fixing the cutting edge tips 20 are provided, and the front of the cutting edge tips 20 in the tool rotation direction is provided. The first dent 12 for forming a space in the first dent, the second dent 13 continuous to the first dent 12, and one of the cutting edge tips 20 when viewed from the front end is the rotation center axis of the main body 10. The first recess 12 is formed adjacent to a part of the rake face of each cutting edge tip 20 and opened toward the tip of the main body 10, and the second recess 13 is The ratio of the first recess 12 and the second recess 13 is 65% or more and 75% with respect to the region defined by the tool diameter when viewed from the front end. Drilling bit 100 which is: [Selection] Figure 2

Description

本発明は掘削工具に用いられるビット、特に二重管式掘削工具に用いられるビットに関する。 The present invention relates to a bit used for a drilling tool, and more particularly to a bit used for a double-pipe type drilling tool.

従来掘削に用いられる工具として、特許文献１に開示されているような二重管式掘削工具が知られている。二重管式掘削工具は、前面に掘削刃を備えるインナービットと、前面または側面に掘削刃を備える筒状のアウタービットとによって掘削ビットを構成し、インナービットをアウタービットに挿入して着脱自在に一体化し、一体化された掘削ビットに回転および打撃を加えながら掘削する。 As a tool conventionally used for excavation, a double-pipe excavation tool as disclosed in Patent Document 1 is known. The double-pipe type drilling tool is composed of an inner bit with a drilling blade on the front and a cylindrical outer bit with a drilling blade on the front or side, and the inner bit is inserted into the outer bit and can be removed. And drilling while rotating and hitting the integrated drill bit.

特開２０１０−１４４５０号公報JP 2010-14450 A

ビットの形状によらず軟岩層では硬岩層に比べて１回転当たりの排出土砂が多くそれらを取り込む必要がある。しかしながら特許文献１に開示されているような形状のビットでは、点当たりで仕事をするため排出土砂を取り込むことが困難である。取り込むことができなかった土砂は詰まりの原因となり、掘削作業を中断しなければならなかったり、機械自体が破損したりする。本発明は上述した課題に鑑みて、軟岩層を効率的に削ることができ、取り込みやすい土砂を形成する掘削ビットを提供することを目的とする。 Regardless of the shape of the bit, the soft rock layer requires a larger amount of discharged sediment per rotation than the hard rock layer. However, in the bit having a shape as disclosed in Patent Document 1, it is difficult to take in the discharged earth and sand because it works per point. The earth and sand that could not be taken in would cause clogging, and the excavation work had to be interrupted, or the machine itself could be damaged. In view of the above-described problems, an object of the present invention is to provide an excavation bit that can efficiently cut a soft rock layer and form earth and sand that can be easily taken up.

本発明にかかる掘削ビットは、二つ以上の板状の切れ刃チップと、前記切れ刃チップを固定するための略円筒形状の本体部と、を備え、前記本体部は前記切れ刃チップを取り付けるためのチップ取り付け部と、各前記切れ刃チップに対して工具回転方向前方に空間を形成するための第１の窪みと、前記第１の窪みに連続する第２の窪みと、前記第１の窪みに形成された開口部から流体を噴射させるための流路と、を備え、先端視したとき、前記切れ刃チップの一つは、前記本体部の回転中心軸線を越えて配置されており、前記第１の窪みは各前記切れ刃チップのすくい面の一部に隣接し、なおかつ前記本体部の先端に向って開放されて形成され、前記第２の窪みは前記本体部の先端に向って開放されて形成され、
前記流路は前記本体部の内部に形成され、先端視したとき、前記第１の窪みおよび前記第２の窪みが占める割合が、工具径によって規定される領域に対して６５％以上７５％以下である。 The excavation bit according to the present invention includes two or more plate-shaped cutting edge tips and a substantially cylindrical main body portion for fixing the cutting edge tips, and the main body portion attaches the cutting edge tips. A first dent for forming a space in front of the tool rotation direction with respect to each of the cutting edge tips, a second dent continuous to the first dent, and the first dent A flow path for injecting a fluid from an opening formed in the depression, and when viewed from the tip, one of the cutting edge tips is disposed beyond the rotation center axis of the main body, The first recess is formed adjacent to a part of the rake face of each cutting edge tip and opened toward the tip of the main body, and the second recess is directed to the tip of the main body. Open and formed,
The flow path is formed inside the main body, and when viewed from the tip, the ratio of the first depression and the second depression is 65% or more and 75% or less with respect to the region defined by the tool diameter. It is.

本発明の掘削ビットによれば、複数の板状の切れ刃チップを用いるため、切れ刃が線（面）当たりで仕事をすることになり、効果的に軟岩層を掘削することができる。また、切れ刃チップが工具の回転軸線を越えて配置されるため効率的に掘削が可能になる。さらに、切れ刃チップのすくい面に隣接して大きく窪みが形成され、その窪みの表面に形成された開口部から水が噴射されるため、生じた土砂を効率的に地上へ押し流すことができる。 According to the excavation bit of the present invention, since a plurality of plate-like cutting edge tips are used, the cutting edge performs work per line (surface), and the soft rock layer can be excavated effectively. Further, since the cutting edge tip is disposed beyond the rotation axis of the tool, excavation can be efficiently performed. In addition, a large depression is formed adjacent to the rake face of the cutting edge tip, and water is ejected from an opening formed in the surface of the depression, so that the generated earth and sand can be efficiently pushed to the ground.

図１は本発明の第１の実施形態に係る掘削ビットの斜視図である。FIG. 1 is a perspective view of a drill bit according to the first embodiment of the present invention. 図２は図１の掘削ビットを先端視した図である。FIG. 2 is a front view of the excavation bit of FIG. 図３は図２のＩＩＩ−ＩＩＩ断面図である。3 is a cross-sectional view taken along the line III-III in FIG. 図４は図１の掘削ビットの側面図である。4 is a side view of the excavation bit of FIG. 図５は図１の掘削ビットの側面図である。FIG. 5 is a side view of the excavation bit of FIG. 図６は図１の掘削ビットの本体部だけを示す斜視図である。FIG. 6 is a perspective view showing only the main body of the excavation bit of FIG. 図７は図１の掘削ビットの切れ刃チップだけを示す斜視図である。FIG. 7 is a perspective view showing only the cutting edge tip of the excavation bit of FIG. 1. 図８は本発明の第２の実施形態に係る掘削ビットの斜視図である。FIG. 8 is a perspective view of a drill bit according to the second embodiment of the present invention. 図９は図８の掘削ビットを先端視した図である。FIG. 9 is a front view of the excavation bit of FIG. 図１０は図８の掘削ビットの側面図である。FIG. 10 is a side view of the excavation bit of FIG. 図１１は図８の掘削ビットの側面図である。FIG. 11 is a side view of the excavation bit of FIG.

本発明の掘削ビットの一実施形態について図面を用いて説明する。本実施形態の掘削ビット１００は、二重管掘削工具に用いられるビットであり、いわゆるルーフ型と呼称される形状に類似している。具体的には、掘削ビット１００は全体的に略円筒形状の本体部１０と、本体部１０の先端に二つ取り付けられた板状の切れ刃チップ２０と、を備える。 An embodiment of a drill bit according to the present invention will be described with reference to the drawings. The excavation bit 100 of this embodiment is a bit used for a double pipe excavation tool, and has a shape similar to a so-called roof type. Specifically, the excavation bit 100 includes a generally cylindrical main body 10 and two plate-shaped cutting edge tips 20 attached to the tip of the main body 10.

図７に示すように、切れ刃チップ２０のすくい面２１は、最も長い第１の辺稜部２１ａと、第１の辺稜部２１ａから垂直に延びる第２の辺稜部２１ｂおよび第３の辺稜部２１ｃと、互いに鈍角に交差し第２の辺稜部２１ｂおよび第３の辺稜部２１ｃに接続する第４の辺稜部２１ｄおよび第５の辺稜部２１ｅと、で構成された五角形状になっている。第４の辺稜部２１ｄおよび第５の辺稜部２１ｅが切れ刃として作用し、第５の辺稜部２１ｅが第４の辺稜部２１ｄよりも長くなっている。第１の辺稜部２１ａに接続する側面は本体部１０に形成されるチップ取り付け部との当接面となり、切れ刃チップ２０の工具回転軸方向への移動を拘束する。 As shown in FIG. 7, the rake face 21 of the cutting edge tip 20 includes a longest first side ridge 21a, a second side ridge 21b that extends perpendicularly from the first side ridge 21a, and a third side ridge 21b. The side ridge portion 21c and the fourth side ridge portion 21d and the fifth side ridge portion 21e that intersect with each other at an obtuse angle and are connected to the second side ridge portion 21b and the third side ridge portion 21c. It has a pentagonal shape. The fourth side ridge part 21d and the fifth side ridge part 21e act as cutting edges, and the fifth side ridge part 21e is longer than the fourth side ridge part 21d. The side surface connected to the first side ridge portion 21a serves as a contact surface with the tip mounting portion formed on the main body portion 10, and restrains the movement of the cutting edge tip 20 in the tool rotation axis direction.

図１から図６に示すように、本体部１０はその先端に形成された溝状のチップ取り付け部１１と、各切れ刃チップ２０の工具回転方向前方に設けられた第１の窪み１２と、第１の窪み１２に隣接して形成される第２の窪み１３と、本体部１０の内部に形成される一本の大流路１４と、大流路１４から分岐して第１の窪み１２に開口部を形成する小流路１５と、を備える。 As shown in FIGS. 1 to 6, the main body 10 has a groove-shaped tip attachment portion 11 formed at the tip thereof, a first recess 12 provided in the front of the tool rotation direction of each cutting edge tip 20, and A second depression 13 formed adjacent to the first depression 12, a single large flow path 14 formed inside the main body 10, and the first depression 12 branched from the large flow path 14. And a small channel 15 that forms an opening.

チップ取り付け部１１は四つの面で構成されており、一つは切れ刃チップ２０の第１の辺稜部２１ａに接続する側面と当接し、一つは切れ刃チップ２０のすくい面２１に対向する側面と当接し、一つは切れ刃チップ２０の第２の辺稜部２１ｂに接続する側面と当接し、一つは切れ刃チップ２０のすくい面２１に当接する。 The tip attaching portion 11 is composed of four surfaces, one abutting against the side surface connected to the first side ridge portion 21a of the cutting edge tip 20, and one facing the rake face 21 of the cutting edge tip 20. One is in contact with the side connected to the second side ridge portion 21 b of the cutting edge tip 20, and one is in contact with the rake face 21 of the cutting edge tip 20.

第１の窪み１２は切れ刃チップ２０のすくい面２１に隣接して形成されている。そのため、すくい面２１の一部は露出した状態になっている。また、第１の窪み１２は曲面で構成され、本体部１０の先端に向って開放されている。言いかえると、第１の窪み１２は本体部１０をその先端から抉ったような形状に形成されている。そのため、掘削により生成された土砂が円滑に移動できるようにするための空間が十分に確保されている。同じく第２の窪み１３も曲面で構成され、本体部１０の先端に向って開放されている。
本体部１０を先端視したとき、図２に示すように、二つずつある第１の窪み１２および第２の窪み１３が工具径Ｄによって規定される領域Ｓに占める割合は６５％以上７５％以下になっている。
図２に示すように、各切れ刃チップ２０は工具回転中心軸付近に極力隙間が形成されないように隣接し、なおかつ領域Ｓを二等分する仮想線Ｌを跨ぐように配置される。 The first recess 12 is formed adjacent to the rake face 21 of the cutting edge tip 20. Therefore, a part of the rake face 21 is exposed. The first recess 12 is formed of a curved surface and is opened toward the tip of the main body 10. In other words, the first recess 12 is formed in a shape like the main body portion 10 is rolled from the tip. Therefore, a sufficient space is ensured so that the earth and sand generated by excavation can move smoothly. Similarly, the second recess 13 is also formed of a curved surface and is opened toward the tip of the main body 10.
When the front end of the main body 10 is viewed, as shown in FIG. 2, the ratio of the two first dents 12 and two second dents 13 to the region S defined by the tool diameter D is 65% or more and 75%. It is as follows.
As shown in FIG. 2, the respective cutting edge tips 20 are arranged so as to be adjacent to each other so as not to form a gap as much as possible in the vicinity of the tool rotation center axis, and to straddle the virtual line L that bisects the region S.

次に掘削ビット１００が奏する効果について説明する。掘削ビット１００が備える切れ刃チップ２０はその一方端が掘削ビット１００の回転中心軸線を越えるように配置されており、それに伴って切れ刃も回転中心軸線を越えるように配置される。さらに、第１の窪み１２に加えて第２の窪み１３も形成されており、小流路１５の開口部が第２の窪み１３に形成されている。このことにより、小流路１５の開口部から噴射される水によって効率よく土砂を後方に押し流すことができるようになる。また掘削ビット１００を先端視したとき、第１の窪み１２および第２の窪み１３が領域Ｓに対して６５％以上７５％以下であるため、掘削ビット１００は十分な強度があるにもかかわらず、噴射された水が通過するのに十分な大きさの空間が確保され、なおかつ軽量化も実現している。 Next, the effect produced by the excavation bit 100 will be described. The cutting edge tip 20 included in the excavation bit 100 is disposed so that one end thereof exceeds the rotation center axis of the excavation bit 100, and accordingly, the cutting edge is also disposed so as to exceed the rotation center axis. Furthermore, in addition to the first recess 12, a second recess 13 is also formed, and an opening of the small flow path 15 is formed in the second recess 13. As a result, the earth and sand can be efficiently pushed backward by the water sprayed from the opening of the small flow path 15. Further, when the excavation bit 100 is viewed from the tip, since the first depression 12 and the second depression 13 are 65% or more and 75% or less with respect to the region S, the excavation bit 100 has sufficient strength. In addition, a space large enough to allow the jetted water to pass through is secured, and the weight is also reduced.

次に第２の実施形態について説明する。第２実施形態については上述した第１の実施形態と同じ機能の部分には第１実施形態の説明で用いた符号と同じ符号を使用して説明を省略し、第１の実施形態とは異なる部分についてのみ説明する。 Next, a second embodiment will be described. In the second embodiment, the same functions as those in the first embodiment described above are denoted by the same reference numerals as those used in the description of the first embodiment, and the description thereof is omitted, which is different from the first embodiment. Only the part will be described.

第２の実施形態の掘削工具２００は、切れ刃チップ２０を三つ備えており、そのうちの一つが掘削工具２００の回転中心軸線を越えて配置されている。各切れ刃チップ２０に隣接して第１の窪み１２が形成され、第１の窪み１２に隣接して第２の窪み１３が形成される。
このように、切れ刃チップ２０を三つ以上備える場合には少なくともその一つが掘削工具２００の回転中心軸線を越えて配置されれば第１の実施形態と同様の効率的な掘削が可能になる。 The excavation tool 200 of the second embodiment includes three cutting edge tips 20, one of which is disposed beyond the rotation center axis of the excavation tool 200. A first recess 12 is formed adjacent to each cutting edge tip 20, and a second recess 13 is formed adjacent to the first recess 12.
Thus, when three or more cutting edge tips 20 are provided, if at least one of them is disposed beyond the rotation center axis of the excavation tool 200, the same efficient excavation as that in the first embodiment becomes possible. .

以上、本発明についてその一実施形態を例に説明したが、本発明は上記の実施形態に限定されない。例えば、切れ刃チップ２０は四つ以上用いてもよい。 As mentioned above, although one embodiment was described as an example about the present invention, the present invention is not limited to the above-mentioned embodiment. For example, four or more cutting edge tips 20 may be used.

１０…本体部、１１…チップ取り付け部、１２…第１の窪み、１３…第２の窪み、１４…大流路、１５…小流路、２０…切れ刃チップ、２１…すくい面、１００…掘削ビット、Ｓ…工具径によって規定される領域 DESCRIPTION OF SYMBOLS 10 ... Main-body part, 11 ... Tip attachment part, 12 ... 1st hollow, 13 ... 2nd hollow, 14 ... Large flow path, 15 ... Small flow path, 20 ... Cutting edge chip, 21 ... Rake face, 100 ... Drill bit, S ... Area defined by tool diameter

Claims (1)

二つ以上の板状の切れ刃チップと、
前記切れ刃チップを固定するための略円筒形状の本体部と、を備え、
前記切れ刃チップの第１の端面は、第１の辺稜部と、前記第１の辺稜部に対して垂直に接続する第２の辺稜部および第３の辺稜部と、前記第２の辺稜部に接続する第４の辺稜部と、前記第３の辺稜部に接続する第５の辺稜部とを有する五角形であって、且つ前記第４の辺稜部と前記第５の辺稜部とは鈍角に交差し、前記第５の辺稜部は前記第４の辺稜部よりも長く、前記切れ刃チップの前記第１の辺稜部に接続する前記第１の端面とは異なる第２の端面が当接面として作用し、
前記本体部は、前記切れ刃チップの前記第２の端面に当接する当接面を有する前記切れ刃チップを取り付けるためのチップ取り付け部と、
各前記切れ刃チップに対して工具回転方向前方に空間を形成するための第１の窪みと、
前記第１の窪みに連続して形成される第２の窪みと、
前記第１の窪みに形成された開口部から流体を噴射させるための流路と、を備え、
先端視したとき、前記切れ刃チップの一つは、前記本体部の回転中心軸線を越えて配置されており、
前記第１の窪みは各前記切れ刃チップのすくい面の一部に隣接し、なおかつ前記本体部の先端に向って開放されて形成され、
前記第２の窪みは前記本体部の先端に向って開放されて形成され、
前記流路は前記本体部の内部に形成され、
先端視したとき、前記第１の窪みおよび前記第２の窪みが占める割合が、工具径によって規定される領域に対して６５％以上７５％以下である
掘削ビット Two or more plate-shaped cutting edge tips;
A substantially cylindrical main body for fixing the cutting edge tip,
The first end surface of the cutting edge tip includes a first side ridge portion, a second side ridge portion and a third side ridge portion that are connected perpendicularly to the first side ridge portion, and the first side ridge portion, A pentagon having a fourth side ridge connected to the second side ridge, and a fifth side ridge connected to the third side ridge, and the fourth side ridge and the The fifth side ridge intersects an obtuse angle, the fifth side ridge is longer than the fourth side ridge, and is connected to the first side ridge of the cutting edge tip. A second end surface different from the end surface of the first surface acts as a contact surface;
The main body portion has a tip attachment portion for attaching the cutting edge tip having a contact surface that comes into contact with the second end surface of the cutting edge tip ;
A first recess for forming a space in front of the tool rotation direction with respect to each of the cutting edge tips;
A second depression formed continuously with the first depression;
A flow path for injecting fluid from an opening formed in the first depression,
When viewed from the tip, one of the cutting edge tips is disposed beyond the rotation center axis of the main body,
The first recess is formed adjacent to a part of the rake face of each cutting edge tip and opened toward the tip of the main body,
The second depression is formed to open toward the tip of the main body,
The flow path is formed inside the main body,
A drill bit in which the ratio of the first depression and the second depression is 65% or more and 75% or less with respect to the region defined by the tool diameter when viewed from the tip.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2246812A (en) * 1938-09-26 1941-06-24 Felix L Pivoto Welded on blade bit
US2521791A (en) * 1945-09-21 1950-09-12 George G Harrington Replaceable blade bit
US3434554A (en) * 1967-03-08 1969-03-25 Gen Electric Cutter bit for drills
US4190125A (en) * 1977-11-09 1980-02-26 Fansteel Inc. Drill bit and steel combination for improved fluid flow
JPS58180990U (en) * 1982-05-28 1983-12-02 古河鉱業株式会社 Rod for mudstone drilling
FI68293B (en) * 1982-11-30 1985-04-30 Airam Ab Oy FOERFARANDE I LAONGHAOLBERGBORRNING OCH BORRSTAONGSYSTEM
US4492278A (en) * 1983-05-09 1985-01-08 Hughes Tool Company Roof bit
US5184925A (en) * 1992-01-10 1993-02-09 Kennametal Inc. Insert and insert support bar
JPH09272118A (en) * 1996-04-03 1997-10-21 Sho Bond Constr Co Ltd Concrete boring drill
US5996714A (en) * 1997-07-15 1999-12-07 Kennametal Inc. Rotatable cutting bit assembly with wedge-lock retention assembly
JP2003301681A (en) * 2002-04-10 2003-10-24 Toho Kinzoku Co Ltd Boring device
JP2007277957A (en) * 2006-04-07 2007-10-25 Nakai Kogyo Kk Drilling bit
RU2012155714A (en) * 2010-06-21 2014-07-27 Тунгалой Корпорейшн CUTTING PLATE AND INDEXED MILL

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