JP2002030882A - Bit and boring method - Google Patents
Bit and boring methodInfo
- Publication number
- JP2002030882A JP2002030882A JP2000218031A JP2000218031A JP2002030882A JP 2002030882 A JP2002030882 A JP 2002030882A JP 2000218031 A JP2000218031 A JP 2000218031A JP 2000218031 A JP2000218031 A JP 2000218031A JP 2002030882 A JP2002030882 A JP 2002030882A
- Authority
- JP
- Japan
- Prior art keywords
- bit
- layer segment
- grain layer
- abrasive grain
- base metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Earth Drilling (AREA)
- Polishing Bodies And Polishing Tools (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、コンクリート構造
物等に円形の孔を形成する等の用途に使用されるビット
及び穿孔方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bit used for forming a circular hole in a concrete structure or the like and a method for piercing the bit.
【０００２】[0002]
【従来の技術】この種のビット１０は、図５に示すよう
に、円筒状をなす台金１と、この台金１の基端側に同軸
に設けられた軸部２と、前記台金１の先端に周方向に一
定間隔で固着されたメタルボンド砥石からなる複数の砥
粒層セグメント３からなるものであり、前記軸部２が駆
動装置に連結される。そして、駆動装置によりビット１
０を回転させつつ、コンクリート構造物等の被削材Ｗに
押し当てることにより、砥粒層セグメント３で被削材Ｗ
を穿孔加工して円筒状の貫通孔または孔を形成する。穿
孔加工の際には砥粒層セグメント３の先端の研削面３ａ
の発熱を抑え、切り粉の排出を促すために、前記軸部２
の内周を通してビット１０内に研削媒体４が連続的に供
給される。このような研削媒体４として、一般には水等
の研削液が用いられ、湿式で被削材Ｗの穿孔加工が行わ
れる。このとき、切り粉と水が混ざりあってヘドロ状に
なった研削液が排出されるが、排出される研削液すべて
を回収するのは難しく、周辺環境を汚してしまい、とく
に屋内などでの加工では不具合を生じる。このような問
題を解決するために、研削媒体４として水に代えてＳｉ
Ｃやアルミナ等の遊離砥粒とともにエアーを用いて、乾
式で穿孔加工を行うことが提案されているが、砥粒層セ
グメント３の先端の研削面３ａと被削材Ｗとの界面に研
削媒体４がうまく供給されず、研削媒体４のほとんどが
各砥粒層セグメント３間の隙間から外周側に流れ出し、
砥粒層セグメント３が目詰まりしやすくなって、切り粉
の排出性が悪くなるという欠点を有していた。2. Description of the Related Art As shown in FIG. 5, a bit 10 of this kind includes a base metal 1 having a cylindrical shape, a shaft 2 provided coaxially on the base end side of the base metal 1, 1 comprises a plurality of abrasive grain layer segments 3 made of a metal-bonded grindstone fixed at a constant interval in the circumferential direction to the tip of the shaft 1. The shaft portion 2 is connected to a driving device. Then, bit 1 is driven by the driving device.
0 is pressed against the work material W such as a concrete structure while rotating the work material W in the abrasive grain layer segment 3.
To form a cylindrical through-hole or hole. When drilling, the ground surface 3a at the tip of the abrasive layer segment 3
In order to suppress the heat generation of the shaft and promote the discharge of the cuttings, the shaft 2
The grinding medium 4 is continuously supplied into the bit 10 through the inner circumference of the grinding tool. As such a grinding medium 4, a grinding fluid such as water is generally used, and the workpiece W is drilled in a wet manner. At this time, the cutting fluid and the water are mixed and the sludge-like grinding fluid is discharged.However, it is difficult to collect all the discharged grinding fluid, and the surrounding environment is polluted. Causes a problem. In order to solve such a problem, Si is used as the grinding medium 4 instead of water.
It has been proposed to perform dry drilling using air together with free abrasive grains such as C and alumina. However, a grinding medium is provided at the interface between the grinding surface 3a at the tip of the abrasive grain layer segment 3 and the work material W. 4 is not supplied well, and most of the grinding medium 4 flows out from the gap between the respective abrasive grain layer segments 3 to the outer peripheral side,
The abrasive layer segment 3 is liable to be clogged, and has a disadvantage that the discharging ability of the swarf is deteriorated.
【０００３】また、上述のビットとは別に、以下に記載
するようなビットが提案されている。この一例を示すビ
ット２０は、図６（ａ），（ｂ）に示すように、円筒状
をなす台金１の先端に沿って周方向に一定間隔で固着さ
れた砥粒層セグメント１３を有し、該砥粒層セグメント
１３の研削面１３ａのビット回転方向Ｔの前方側に台金
１側に傾斜する平面状の傾斜面１３ｂが形成されている
ものである。この場合、前記傾斜面１３ｂが設けられて
いるために、被削材Ｗの穿孔加工中に、研削媒体４が傾
斜面１３ｂに誘導されるようにして砥粒層セグメント１
３の研削面１３ａと被削材Ｗとの界面に供給されること
になる。In addition to the above-mentioned bits, the following bits have been proposed. As shown in FIGS. 6 (a) and 6 (b), a bit 20 showing this example has an abrasive grain layer segment 13 fixed at regular intervals in the circumferential direction along the tip of a cylindrical base metal 1. In addition, a flat inclined surface 13b inclined toward the base metal 1 is formed in front of the grinding surface 13a of the abrasive grain layer segment 13 in the bit rotation direction T. In this case, since the inclined surface 13b is provided, the grinding medium 4 is guided to the inclined surface 13b during the drilling of the workpiece W so that the abrasive layer segment 1 is formed.
3 is supplied to the interface between the ground surface 13a and the workpiece W.
【０００４】[0004]
【発明が解決しようとする課題】しかし、砥粒層セグメ
ント１３の傾斜面１３ｂにより、研削面１３ａと傾斜面
１３ｂとの境界線１３ｃが稜線として形成されているた
めに、研削面１３ａと被削材Ｗとの界面にうまく巻き込
まれずに供給されにくい。さらに、ビット２０の回転方
向Ｔと略直交するような壁面１３ｄがビット回転方向Ｔ
の前方側に形成されていることから、この壁面１３ｄに
より傾斜面１３ｂに流動しようとする研削媒体４が遮ら
れて、各砥粒層セグメント１３間の隙間から外周側に排
出される量が依然として多い。これらのことから、外周
側に流れ出る研削媒体４の量が多くなり、研削面１３ａ
と被削材Ｗとの界面に供給される研削媒体４の量がなお
不十分であった。However, since the boundary 13c between the grinding surface 13a and the inclined surface 13b is formed as a ridge line by the inclined surface 13b of the abrasive grain layer segment 13, the grinding surface 13a and the workpiece It is difficult to be supplied without being well involved in the interface with the material W. Further, the wall surface 13d that is substantially perpendicular to the rotation direction T of the bit 20 is
Is formed on the front side, the grinding medium 4 which tends to flow to the inclined surface 13b is blocked by the wall surface 13d, and the amount discharged to the outer peripheral side from the gap between the respective abrasive grain layer segments 13 is still small. Many. For these reasons, the amount of the grinding medium 4 flowing to the outer peripheral side increases, and the grinding surface 13a
The amount of the grinding medium 4 supplied to the interface between the workpiece and the workpiece W was still insufficient.
【０００５】本発明は、上記事情に鑑みてなされたもの
で、研削媒体の砥粒層セグメントの研削面への供給を良
好にして、砥粒層セグメントの切れ味を良好に保ち、目
詰まりを防ぐことのできるビット及び穿孔方法を提供す
ることを目的とする。The present invention has been made in view of the above circumstances, and improves the supply of a grinding medium to a grinding surface of an abrasive layer segment to maintain the sharpness of the abrasive layer segment and prevent clogging. It is an object of the present invention to provide a bit and a drilling method that can perform the drilling.
【０００６】[0006]
【課題を解決するための手段】本発明は、前記課題を解
決するために以下の構成を採用した。すなわち、請求項
１に記載のビットでは、円筒状をなす台金と、前記台金
の先端に沿って固着された多数の砥粒層セグメントとを
有し、台金の軸線回りに回転されるビットにおいて、前
記砥粒層セグメントの研削面のビット回転方向の前方側
に位置する部分が回転方向の前方側に向かうにしたがい
台金に近づく凸曲面とされている構成とした。このよう
な構成としたことにより、被削材の穿孔加工中に流動し
ている研削媒体の一部が前記凸曲面に巻き込まれるよう
にして研削面と被削材との界面に供給されて、砥粒層セ
グメントの自生発刃を促し、切れ味を常に良好に保ち、
目詰まりを防いで切り屑の排出性も高めることができ
る。The present invention has the following features to attain the object mentioned above. That is, the bit according to claim 1 has a base metal having a cylindrical shape, and a number of abrasive layer segments fixed along the tip of the base metal, and is rotated around the axis of the base metal. In the bit, a portion of the ground surface of the abrasive grain layer segment, which is located on the front side in the bit rotation direction, has a convex curved surface approaching the base metal toward the front side in the rotation direction. With such a configuration, a part of the grinding medium flowing during the drilling of the work material is supplied to the interface between the grinding surface and the work material so as to be caught in the convex curved surface, Encourages the spontaneous cutting of the abrasive layer segments, always keeps the sharpness good,
The clogging can be prevented and the chip discharge property can be improved.
【０００７】請求項２に記載のビットでは、請求項１に
記載のビットにおいて、前記凸曲面が台金の砥粒層セグ
メントとの固着面まで続くような構成とされている。こ
のような構成としたことにより、被削材の穿孔加工時に
前記研削面と被削材との界面に研削媒体が供給されやす
く、長期にわたって砥粒層セグメントの良好かつ安定し
た切れ味が得られる。According to a second aspect of the present invention, in the bit of the first aspect, the convex curved surface extends to a surface of the base metal fixed to the abrasive grain layer segment. With such a configuration, a grinding medium is easily supplied to the interface between the ground surface and the work material at the time of drilling the work material, and a good and stable sharpness of the abrasive grain layer segment can be obtained for a long period of time.
【０００８】請求項３に記載の穿孔方法では、請求項１
または請求項２に記載のビットを用いた穿孔方法であっ
て、前記ビットを軸線回りに回転させ、各砥粒層セグメ
ントを被削材に切り込ませつつ、ビット本体内に遊離砥
粒を導入し、砥粒層セグメントの研削面と被削材との間
に前記遊離砥粒を供給しつつ被削材の加工を行うことを
特徴とする。このような方法を用いたことにより、前記
遊離砥粒が前記凸曲面に巻き込まれるようにして研削面
と被削材との界面に供給されて砥粒層セグメントの自生
発刃を促して切れ味を常に良好に保ち、目詰まりを防止
する効果が従来に比べて、特に顕著になる。According to the third aspect of the present invention, there is provided a drilling method.
Or a drilling method using a bit according to claim 2, wherein the bit is rotated around an axis to introduce free abrasive grains into the bit body while cutting each abrasive grain layer segment into a work material. The processing of the work material is performed while supplying the free abrasive grains between the ground surface of the abrasive grain layer segment and the work material. By using such a method, the free abrasive grains are supplied to the interface between the grinding surface and the work material in such a manner as to be rolled into the convex curved surface, and promote the spontaneous cutting of the abrasive grain layer segment to sharpen the sharpness. The effect of always keeping good and preventing clogging becomes particularly remarkable as compared with the conventional case.
【０００９】[0009]
【発明の実施の形態】以下、本発明の実施形態を添付し
た図面を参照しながら説明するが、上述の先行技術と同
一または同様の部分には同一の符号を用いてその説明を
省略する。図１は本発明の一実施形態によるビットの斜
視図、図２は同ビットの先端部の側面図、図３は同ビッ
トの先端部の正面図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the attached drawings, but the same or similar parts as those of the above-mentioned prior art will be denoted by the same reference numerals and description thereof will be omitted. FIG. 1 is a perspective view of a bit according to an embodiment of the present invention, FIG. 2 is a side view of the tip of the bit, and FIG. 3 is a front view of the tip of the bit.
【００１０】本発明の実施形態によるビット３０は主に
乾式切断加工用であり、円筒形の台金１と、その基端側
に小径円筒状の軸部２が同軸状に形成され、台金１の先
端側には、図１に示すように、略円弧状をなす複数の砥
粒層セグメント２３が、台金１の周方向に一定間隔Ｌを
介して一列に並んで例えばろう付け等によって固着され
ている。A bit 30 according to an embodiment of the present invention is mainly used for dry cutting, and has a cylindrical base 1 and a small-diameter cylindrical shaft 2 formed coaxially at the base end thereof. As shown in FIG. 1, a plurality of abrasive grain layer segments 23 each having a substantially arc shape are arranged in a line in the circumferential direction of the base metal 1 at a predetermined distance L on the tip end side of the base 1, for example, by brazing or the like. It is fixed.
【００１１】砥粒層セグメント２３は、図２に示すよう
に、平坦で被削材の穿孔加工に用いられる研削面２３ａ
のビット回転方向Ｔの前方側に位置する部分に、ビット
回転方向Ｔの前方側に向かうにしたがい漸次台金１に近
づいていくような凸曲面２３ｂが形成されている。さら
に、凸曲面２３ｂは砥粒層セグメント２３のビット回転
方向Ｔの後方側に位置する研削面２３ａから滑らかに連
続して形成されており、凸曲面２３ｂのビット回転方向
Ｔの最前方側の端線２３ｃは台金１の砥粒層セグメント
２３との固着面１ａまで続いている。砥粒層セグメント
２３の幅は、例えば図３に示すように台金１の肉厚より
も大きく、互いの幅方向の中心を一致させている。ま
た、砥粒層セグメント２３は、メタルボンド砥石とさ
れ、ＮｉやＣｕ合金等からなる金属結合相中にダイヤモ
ンドやＣＢＮ等の超砥粒が分散配置されている。ただ
し、本発明ではその他の砥粒及び結合剤を使用してもよ
い。ここで、砥粒層セグメント２３の研削面２３ａは、
凸曲面２３ａが存在することにより、被削材Ｗに接触し
て研削する面積が従来のビットに比べて小さくなってい
るので、各砥粒層セグメント２３間に設けられた間隔Ｌ
を従来のビットよりも小さくして、従来と同程度の研削
面積を得るようにしている。As shown in FIG. 2, the abrasive grain layer segment 23 has a flat grinding surface 23a used for drilling a work material.
A convex curved surface 23b is formed at a portion located on the front side in the bit rotation direction T so as to gradually approach the base metal 1 toward the front side in the bit rotation direction T. Further, the convex curved surface 23b is formed smoothly and continuously from the grinding surface 23a located on the rear side of the abrasive grain layer segment 23 in the bit rotation direction T, and is the foremost end of the convex curved surface 23b in the bit rotation direction T. The line 23c continues to the fixing surface 1a of the base metal 1 with the abrasive grain layer segment 23. The width of the abrasive grain layer segment 23 is larger than the thickness of the base metal 1, for example, as shown in FIG. Further, the abrasive grain layer segment 23 is a metal bond grindstone, in which superabrasive grains such as diamond and CBN are dispersed and arranged in a metal binding phase made of Ni or Cu alloy. However, other abrasives and binders may be used in the present invention. Here, the grinding surface 23a of the abrasive grain layer segment 23 is
Due to the presence of the convex curved surface 23a, the area to be ground in contact with the workpiece W is smaller than that of the conventional bit, so that the distance L provided between the respective abrasive grain layer segments 23 is reduced.
Is made smaller than the conventional bit, so that the same grinding area as the conventional bit is obtained.
【００１２】次に、上記ビット３０を使用した乾式での
穿孔方法の一例を説明する。この方法ではまず、ビット
３０の軸部２に連結している駆動装置により、ビット３
０を軸線回りに回転させ、各砥粒層セグメント２３を被
削材Ｗに押し当てて切り込みを開始すると同時に、ビッ
ト３０の中空の軸部２を通して台金１の内部に遊離砥粒
４ａとエアーを供給する。Next, an example of a dry drilling method using the bit 30 will be described. In this method, first, a driving device connected to the shaft 2 of the bit 30 causes the bit 3 to be driven.
0 is rotated around the axis, and each abrasive grain layer segment 23 is pressed against the work material W to start cutting, and at the same time, free abrasive grains 4 a and air are introduced into the base metal 1 through the hollow shaft 2 of the bit 30. Supply.
【００１３】遊離砥粒４ａとしては、超砥粒や、あるい
はＳｉＣ，Ａｌ2Ｏ3などの一般砥粒が使用可能であり、
粉末状態のままエアーとともに供給される。遊離砥粒４
ａの平均粒径は必ずしも限定されないが、目立て効果を
高めるためには、砥粒層セグメント２３中の砥粒の平均
粒径の１００〜３０％程度が好ましい。As the free abrasive grains 4a, super abrasive grains or general abrasive grains such as SiC and Al 2 O 3 can be used.
Supplied with air in powder state. Loose abrasive 4
The average particle diameter of a is not necessarily limited, but is preferably about 100 to 30% of the average particle diameter of the abrasive grains in the abrasive grain layer segment 23 in order to enhance the dressing effect.
【００１４】台金１内に供給された遊離砥粒４ａとエア
ーは先端側の切断加工領域に到達したあと、図３に示す
ように、隣接する砥粒層セグメント２３，２３間の固着
面１ａ上に流出して台金１の回転により、砥粒層セグメ
ント２３の凸曲面２３ｂに沿って巻き込まれるようにし
て、砥粒層セグメント２３の研削面２３ａと被削材Ｗと
の界面に入り込み、研削面２３ａに露出する金属結合相
を磨耗させて自生発刃作用を促して切れ味を維持する。
このような目立てに使用された遊離砥粒４ａは、ビット
３０の回転につれ切り粉を伴ってエアーとともに順次ビ
ット３０の外側に排出される。これによって砥粒層セグ
メント２３の研削面２３ａの目詰まりを防ぐとともに研
削面２３ａの焼き付きを抑え、偏磨耗を防いで切り粉の
排出を促し、砥粒層セグメント２３の寿命を長くするこ
とができる。After the loose abrasive grains 4a and the air supplied into the base metal 1 reach the cutting region on the front end side, as shown in FIG. 3, the fixing surface 1a between the adjacent abrasive grain layer segments 23, 23 is formed. It flows out and rotates along with the convex curved surface 23b of the abrasive grain layer segment 23 by the rotation of the base metal 1, and enters the interface between the grinding surface 23a of the abrasive grain layer segment 23 and the workpiece W, The metal binding phase exposed on the grinding surface 23a is worn to promote the self-generated cutting action and maintain sharpness.
The loose abrasive grains 4a used for such dressing are sequentially discharged to the outside of the bit 30 together with air with cutting powder as the bit 30 rotates. Thereby, clogging of the grinding surface 23a of the abrasive layer segment 23 can be prevented, seizure of the grinding surface 23a can be suppressed, uneven wear can be prevented, the discharge of cutting powder can be promoted, and the life of the abrasive layer segment 23 can be extended. .
【００１５】上記のような構成とされたビット及び穿孔
方法によれば、被削材Ｗを穿孔加工する際に導入された
遊離砥粒４ａとエアーが各砥粒層セグメント２３間の隙
間から凸曲面２３ｂに誘導されるようにして、研削面２
３ａと被削材Ｗとの界面に供給され、砥粒層セグメント
２３の目立てを行い、砥粒層セグメント２３の切れ味が
常に良好に維持されるとともに、切り粉の排出性も高め
られ、熱による磨耗を抑えて長期に亘って良好かつ安定
した切れ味が得られる。また、砥粒層セグメント２３の
凸曲面２３ｂが台金１の砥粒層セグメント２３との固着
面１ａまで続いていることから、砥粒層セグメント２３
が磨耗した際でも、常に凸曲面２３ｂが研削面２３ａに
連続して回転方向Ｔの前方側に存在することになり、長
期に亘って砥粒層セグメント２３の良好かつ安定した切
れ味が得られる。また、研削媒体４として遊離砥粒４ａ
とエアーを用いて乾式で被削材Ｗの穿孔加工を行った場
合に、遊離砥粒４ａが砥粒層セグメント２３の目立てを
行い、切れ味を常に良好に保ち、目詰まりを防止する効
果が、従来の乾式での穿孔加工と比較してとくに顕著に
なる。According to the bit and the drilling method configured as described above, the free abrasive grains 4 a and the air introduced when drilling the workpiece W are projected from the gaps between the respective abrasive grain layer segments 23. The grinding surface 2 is guided by the curved surface 23b.
3a is supplied to the interface between the work material W and sharpens the abrasive grain layer segment 23. The sharpness of the abrasive grain layer segment 23 is always maintained well, the discharge of cutting chips is enhanced, and heat is generated. Good and stable sharpness can be obtained over a long period of time by suppressing abrasion. Further, since the convex curved surface 23b of the abrasive grain layer segment 23 continues to the fixed surface 1a of the base metal 1 with the abrasive grain layer segment 23, the abrasive grain layer segment 23
Even when is worn, the convex curved surface 23b is always present on the front side in the rotation direction T continuously to the grinding surface 23a, and good and stable sharpness of the abrasive grain layer segment 23 can be obtained for a long period of time. Also, loose abrasive grains 4a are used as the grinding medium 4.
When the drilling of the work material W is performed in a dry manner using the air and the air, the free abrasive grains 4a sharpen the abrasive grain layer segments 23, always keep the sharpness good, and the effect of preventing clogging, This is particularly noticeable in comparison with conventional dry drilling.
【００１６】また、砥粒層セグメント２３のビット回転
方向Ｔの前方側が凸曲面２３ｂとされていることから、
被削材Ｗの穿孔によって砥粒層セグメント２３のビット
回転方向Ｔの前方側が磨耗して幅が小さくなってしまう
ことがなく、砥粒層セグメント２３の幅と台金１の肉厚
との差で形成される隙間を維持でき、研削媒体や切り粉
の逃げを良好に保つことができる。また、被削材Ｗの種
類に応じて、凸曲面２３ｂの形状を変更することによっ
て、切り粉の状態や切削にかかる力をコントロールでき
る。Further, since the front side of the abrasive grain layer segment 23 in the bit rotation direction T is a convex curved surface 23b,
The difference in width between the width of the abrasive grain layer segment 23 and the thickness of the base metal 1 does not occur because the front side in the bit rotation direction T of the abrasive grain layer segment 23 is worn away due to the perforation of the work material W. Can be maintained, and the escape of the grinding medium and chips can be favorably maintained. In addition, by changing the shape of the convex curved surface 23b according to the type of the workpiece W, the state of the chips and the force applied to the cutting can be controlled.
【００１７】なお、本実施の形態では、乾式で被削材の
穿孔加工を行ったが、水等の研削液を研削媒体として用
いて湿式で被削材の穿孔加工を行った場合でも、凸曲面
２３ｂにより研削液を被削材Ｗと研削面２３ａとの界面
に誘導でき、乾式の場合と同等の効果が得られる。In the present embodiment, the work material is drilled in a dry manner, but even when the work material is drilled in a wet manner using a grinding fluid such as water as a grinding medium, a convex shape is formed. The grinding fluid can be guided to the interface between the workpiece W and the grinding surface 23a by the curved surface 23b, and the same effect as in the case of the dry type can be obtained.
【００１８】次に、本発明によるビットの変形例を説明
する。本変形例によるビット４０は、上述した実施形態
とほぼ同様の構成をもち、上述の実施形態とは砥粒層セ
グメント２３の配置のみが異なる構成とされている。本
変形例によるビット４０は、円筒形の台金１と、その基
端側に円筒状の軸部２が同軸状に形成され、台金１の先
端側には、図４に示すように、略円弧状をなす複数の砥
粒層セグメント２３が、台金１の周方向に隙間なく一列
に並んで例えばろう付け等によって固着された構成とさ
れている。このような構成とされたビット４０を用いた
場合、砥粒層セグメント２３の先端に凸曲面２３ｂを設
けてもビット全体の研削面２３ａによる研削面積を凸曲
面２３ｂのないものと同等以上に維持でき、研削切断効
率が良好になる。しかも隣り合う砥粒層セグメント２
３，２３間では凸曲面２３ｂによる間隔が形成され研削
切断時の発熱を抑え、切り粉の排出を促すことができ
る。Next, a modification of the bit according to the present invention will be described. The bit 40 according to this modification has substantially the same configuration as the above-described embodiment, and is different from the above-described embodiment only in the arrangement of the abrasive grain layer segments 23. The bit 40 according to the present modification has a cylindrical base 1 and a cylindrical shaft portion 2 formed coaxially on the base end thereof, and a distal end of the base 1 as shown in FIG. A plurality of abrasive grain layer segments 23 having a substantially arc shape are arranged in a line in the circumferential direction of the base metal 1 without any gap and fixed by, for example, brazing or the like. When the bit 40 having such a configuration is used, even when the convex curved surface 23b is provided at the tip of the abrasive grain layer segment 23, the grinding area of the entire bit by the ground surface 23a is maintained at least equal to that without the convex curved surface 23b. The grinding and cutting efficiency is improved. Moreover, adjacent abrasive grain layer segments 2
An interval between the convex and concave surfaces 23b is formed between 3 and 23, so that heat generation during grinding and cutting can be suppressed, and discharge of chips can be promoted.
【００１９】[0019]
【発明の効果】本発明によれば、以下に記載するような
効果を有する。すなわち請求項１に記載のビットによれ
ば、砥粒層セグメントの研削面のビット回転方向の前方
側に位置する部分が回転方向の前方側に向かうにしたが
い台金に近づく凸曲面とされていることにより、被削材
の穿孔加工中に導入されてきた研削媒体の一部が前記凸
曲面に巻き込まれるようにして研削面と被削材との界面
に供給され、砥粒層セグメントの目立てを行い、切れ味
を常に安定かつ良好に保ち、目詰まりを防ぐことがで
き、なおかつ良好な切り粉の排出性が得られる。According to the present invention, the following effects can be obtained. That is, according to the bit of the first aspect, the portion of the ground surface of the abrasive grain layer segment located on the front side in the bit rotation direction is a convex curved surface that approaches the base metal toward the front side in the rotation direction. By doing so, a part of the grinding medium introduced during the drilling of the work material is supplied to the interface between the grinding surface and the work material so as to be rolled into the convex curved surface, thereby sharpening the abrasive grain layer segments. By doing so, the sharpness is always kept stable and good, clogging can be prevented, and good chip discharge property can be obtained.
【００２０】請求項２に記載のビットによれば、請求項
１に記載のビットにおいて、前記砥粒層セグメントの先
端面のビット回転方向の前方側に位置する凸曲面が台金
の砥粒層セグメントとの固着面まで続くことにより、磨
耗したときに最後まで凸曲面形状が残るために、長期に
わたって砥粒層セグメントの安定かつ良好な切れ味を保
つことができ、なおかつ良好な切り粉の排出性が得られ
る。According to the bit according to the second aspect, in the bit according to the first aspect, the convex surface located on the front side in the bit rotation direction of the tip end surface of the abrasive layer segment has an abrasive layer of a base metal. By continuing to the fixed surface with the segment, the convex curved surface shape remains to the end when worn, so that the abrasive grain layer segment can maintain a stable and good sharpness for a long time, and also has good chip discharge property Is obtained.
【００２１】請求項３に記載の穿孔方法によれば、請求
項１または請求項２に記載のビットを用いて、前記ビッ
トを軸線回りに回転させ、各砥粒層セグメントを被削材
に切り込ませつつ、ビット本体内に遊離砥粒を導入し、
砥粒層セグメントの研削面と被削材との間に前記遊離砥
粒を供給しつつ被削材の穿孔加工をすることにより、前
記遊離砥粒が前記凸曲面に巻き込まれるようにして、研
削面と被削材との界面に供給されて砥粒層セグメントの
目立てを行い、切れ味を常に良好に保ち、目詰まりを防
止して、なおかつ良好な切り粉の排出性を得る効果が従
来に比べて特に顕著になる。According to the third aspect of the present invention, the bit is rotated around an axis by using the bit according to the first or second aspect, and each abrasive grain layer segment is cut into a work material. While introducing loose abrasive grains into the bit body,
By performing perforation processing of the work material while supplying the free abrasive grains between the ground surface of the abrasive grain layer segment and the work material, grinding such that the free abrasive grains are caught in the convex curved surface, It is supplied to the interface between the surface and the work material to sharpen the abrasive grain layer segment, keep the sharpness always good, prevent clogging, and obtain good chip discharge performance compared to the conventional It becomes particularly noticeable.
【図１】 本発明の実施形態によるビットを示す先端部
の斜視図であるFIG. 1 is a perspective view of a tip portion showing a bit according to an embodiment of the present invention.
【図２】 本発明の実施形態によるビットを示す要部拡
大側面図である。FIG. 2 is an enlarged side view of a main part showing a bit according to the embodiment of the present invention.
【図３】 本発明の実施形態によるビットを示す要部拡
大正面図である。FIG. 3 is an enlarged front view of a main part showing a bit according to an embodiment of the present invention.
【図４】 本発明の実施形態によるビットの変形例を示
す要部拡大側面図である。FIG. 4 is an enlarged side view of a main part showing a modification of the bit according to the embodiment of the present invention.
【図５】 一般的なビットを示す側面断面図である。FIG. 5 is a side sectional view showing a general bit.
【図６】 （ａ）は従来のビットを示す先端部の斜視
図、（ｂ）は（ａ）の要部拡大側面図である。FIG. 6A is a perspective view of a tip portion showing a conventional bit, and FIG. 6B is an enlarged side view of a main part of FIG.
１ 台金 １ａ 固着面 ２ 軸部 ２３ 砥粒層セグメント ２３ａ 研削面 ２３ｂ 凸曲面 ２３ｃ 端線 ３０，４０ ビット Ｔ ビット回転方向 DESCRIPTION OF SYMBOLS 1 Metal 1a Fixed surface 2 Shaft part 23 Abrasive layer segment 23a Grinding surface 23b Convex curved surface 23c End line 30, 40 bits T Bit rotation direction
───────────────────────────────────────────────────── フロントページの続き (72)発明者 川原 剛 神奈川県横浜市都筑区佐江戸町681 日本 ダイヤモンド株式会社内 Ｆターム(参考） 2D029 EA01 FA01 FB00 FC02 FD03 3C063 AA02 AB05 BA04 BA10 BB02 BB03 BB04 BC02 BG10 BH05 EE15 EE21 FF18 FF20 3C069 AA04 BA09 BB01 CA07 EA01 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tsuyoshi Kawahara 681 Saedocho, Tsuzuki-ku, Yokohama-shi, Kanagawa Prefecture Japan Diamond Co., Ltd. F-term (reference) 2D029 EA01 FA01 FB00 FC02 FD03 3C063 AA02 AB05 BA04 BA10 BB02 BB03 BB04 BC02 BG10 BH05 EE15 EE21 FF18 FF20 3C069 AA04 BA09 BB01 CA07 EA01
Claims (3)
沿って固着された複数の砥粒層セグメントとを有し、台
金の軸線回りに回転されるビットにおいて、前記砥粒層
セグメントの研削面のビット回転方向の前方側に位置す
る部分が回転方向の前方側に向かうにしたがい台金に近
づく凸曲面とされていることを特徴とするビット。1. A bit having a cylindrical base metal and a plurality of abrasive grain layer segments fixed along a tip of the base metal, wherein the bit is rotated around an axis of the base metal. A bit, characterized in that a portion of the ground surface of the layer segment located on the front side in the bit rotation direction has a convex curved surface that approaches the base metal as it goes forward in the rotation direction.
くことを特徴とするビット。2. The bit according to claim 1, wherein the convex curved surface continues to a surface of the base metal fixed to the abrasive grain layer segment.
を用いた穿孔方法であって、 前記ビットを軸線回りに回転させ、各砥粒層セグメント
を被削材に切り込ませつつ、ビット本体内に遊離砥粒を
導入し、砥粒層セグメントの研削面と被削材との間に前
記遊離砥粒を供給しつつ被削材の加工を行うことを特徴
とする穿孔方法。3. A drilling method using the bit according to claim 1 or 2, wherein the bit is rotated around an axis so that each abrasive grain layer segment is cut into a work material. A drilling method, wherein free abrasive grains are introduced into the main body, and the work material is processed while supplying the free abrasive grains between the ground surface of the abrasive grain layer segment and the work material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000218031A JP4454116B2 (en) | 2000-07-18 | 2000-07-18 | Drilling method using a bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000218031A JP4454116B2 (en) | 2000-07-18 | 2000-07-18 | Drilling method using a bit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002030882A true JP2002030882A (en) | 2002-01-31 |
| JP4454116B2 JP4454116B2 (en) | 2010-04-21 |
Family
ID=18713048
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000218031A Expired - Lifetime JP4454116B2 (en) | 2000-07-18 | 2000-07-18 | Drilling method using a bit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4454116B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101117092B1 (en) * | 2009-05-06 | 2012-02-22 | 베스텍 주식회사 | A polishing module |
| KR200458850Y1 (en) * | 2009-10-23 | 2012-06-12 | 새솔다이아몬드공업 주식회사 | Diamond grinding wheel |
| CN102581779A (en) * | 2012-03-14 | 2012-07-18 | 青岛四砂泰益研磨有限公司 | Cubic boron nitride grinding wheel for carrying out double-sided grinding processing on oil pump and oil nozzle plunger part and manufacturing method thereof |
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| CN105522491A (en) * | 2015-11-30 | 2016-04-27 | 李家海 | Grinding wheel for passivating bar-shaped metal notch |
| CN105690578A (en) * | 2016-03-31 | 2016-06-22 | 翁文彬 | Diamond tooth-carried drill bit |
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2000
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101117092B1 (en) * | 2009-05-06 | 2012-02-22 | 베스텍 주식회사 | A polishing module |
| KR200458850Y1 (en) * | 2009-10-23 | 2012-06-12 | 새솔다이아몬드공업 주식회사 | Diamond grinding wheel |
| JP2012210685A (en) * | 2011-03-31 | 2012-11-01 | Sumco Corp | Grinding wheel, and double-head grinding method |
| CN102581779A (en) * | 2012-03-14 | 2012-07-18 | 青岛四砂泰益研磨有限公司 | Cubic boron nitride grinding wheel for carrying out double-sided grinding processing on oil pump and oil nozzle plunger part and manufacturing method thereof |
| CN105522491A (en) * | 2015-11-30 | 2016-04-27 | 李家海 | Grinding wheel for passivating bar-shaped metal notch |
| CN105690578A (en) * | 2016-03-31 | 2016-06-22 | 翁文彬 | Diamond tooth-carried drill bit |
| CN105690578B (en) * | 2016-03-31 | 2018-05-29 | 沧州格锐特钻头有限公司 | A kind of diamond belt teeth drill bit |
| CN108312359A (en) * | 2016-03-31 | 2018-07-24 | 南安市耀森智能设备有限公司 | A kind of diamond belt teeth drill bit |
| CN108724478A (en) * | 2016-03-31 | 2018-11-02 | 长泰县爱菲社机械科技有限公司 | A kind of diamond belt teeth drill bit |
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| JP4454116B2 (en) | 2010-04-21 |
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