JPH06155447A - Boring bit and manufacture thereof - Google Patents
Boring bit and manufacture thereofInfo
- Publication number
- JPH06155447A JPH06155447A JP31057992A JP31057992A JPH06155447A JP H06155447 A JPH06155447 A JP H06155447A JP 31057992 A JP31057992 A JP 31057992A JP 31057992 A JP31057992 A JP 31057992A JP H06155447 A JPH06155447 A JP H06155447A
- Authority
- JP
- Japan
- Prior art keywords
- abrasive grain
- grain layer
- segment
- bit
- porous
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
- B28D1/04—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs
- B28D1/041—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs with cylinder saws, e.g. trepanning; saw cylinders, e.g. having their cutting rim equipped with abrasive particles
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
- Drilling Tools (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、コンクリート壁に円形
の貫通孔を形成する等の用途に使用される穿孔ビットお
よびその製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drill bit used for forming circular through holes in a concrete wall and a method for manufacturing the drill bit.
【０００２】[0002]
【従来の技術】この種の穿孔ビットは、円筒状をなすビ
ット本体と、このビット本体の基端側に同軸に設けられ
た軸部と、前記ビット本体の先端に周方向等ピッチで固
定された多数の砥粒層セグメントとからなるものであ
り、前記軸部が駆動装置に連結される。そして、駆動装
置によりビット本科を回転させつつ、コンクリート壁等
の被削材に押し当てることにより、砥粒層セグメントで
被削材を削って貫通孔を形成する。2. Description of the Related Art A perforated bit of this type has a cylindrical bit body, a shaft portion coaxially provided on the base end side of the bit body, and fixed to the tip of the bit body at equal intervals in the circumferential direction. A plurality of abrasive grain layer segments, and the shaft portion is connected to a driving device. Then, the bit main body is rotated by the driving device and pressed against a work material such as a concrete wall, so that the work material is ground by the abrasive layer segment to form a through hole.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、従来の
穿孔ビットは、砥粒層セグメントの切れ味低下や目詰ま
りが発生しやすいという欠点を有していた。なお、前記
穿孔作業は従来、研削液を使用する湿式で行なわれてい
たが、研削液が周囲を汚すため、最近では乾式で穿孔を
行う要求が高まっている。その場合には、研削液を使用
しないため、目詰まりがさらに激しいという問題があっ
た。However, the conventional perforated bit has the drawback that the sharpness of the abrasive grain segment and the clogging of the segment tend to occur. The drilling work has conventionally been carried out by a wet method using a grinding liquid, but recently, since the grinding liquid pollutes the surroundings, there is an increasing demand for dry drilling. In that case, since no grinding liquid is used, there is a problem that clogging is more severe.
【０００４】本発明は上記事情に鑑みてなされたもの
で、砥粒層セグメントの目詰まりを防ぎ、切れ味を常に
良好に保つことの可能な穿孔ビットおよびその製造方法
を提供することを課題としている。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a perforated bit capable of preventing clogging of an abrasive grain layer segment and always maintaining good sharpness, and a manufacturing method thereof. .
【０００５】[0005]
【課題を解決するための手段】本発明に係る穿孔ビット
は、円筒状をなすビット本体と、このビット本体の基端
側に同軸に設けられた中空の軸部と、前記ビット本体の
先端に沿って互いに間隔を空けて固定された多数の砥粒
層セグメントとを有し、前記砥粒層セグメントは金属結
合材中に超砥粒を分散してなる密度比９０％以上の焼結
体で、隣接しあう砥粒層セグメントの間には、密度比が
６０〜８０％の多孔質金属焼結体からなる多孔質架橋部
が形成され、これら多孔質架橋部の先端面は、各砥粒層
セグメントの先端研削面と面一に連続していることを特
徴とする。DISCLOSURE OF THE INVENTION A perforated bit according to the present invention is a bit body having a cylindrical shape, a hollow shaft portion coaxially provided on the base end side of the bit body, and a tip end of the bit body. And a plurality of abrasive grain layer segments fixed at intervals along each other, the abrasive grain layer segments being a sintered body having a density ratio of 90% or more formed by dispersing superabrasive grains in a metal binder. , Between the adjacent abrasive grain layer segments, a porous crosslinked portion made of a porous metal sintered body having a density ratio of 60 to 80% is formed. It is characterized in that it is flush and continuous with the tip ground surface of the layer segment.
【０００６】一方、本発明に係る穿孔用ビットの製造方
法は、下記工程をすべて備えたことを特徴とする。 （ａ）金属結合材粉末および超砥粒を混合し、圧粉成形
して多数のセグメント成形体を形成する工程。 （ｂ）前記セグメント成形体をプレス型の円環状キャビ
ティ内に周方向に間隔を空けて配置したうえ、前記キャ
ビティ内で各セグメント成形体の間隙に金属粉を充填す
る工程。 （ｃ）前記充填された金属粉およびセグメント成形体を
一体的に圧粉成形およびホットプレスして、セグメント
成形体を密度比９０％以上の砥粒層セグメントとすると
ともに、隣接しあう砥粒層セグメントの間に、密度比が
６０〜８０％の多孔質架橋部を一体形成し、全体として
円環状の砥粒層体を得る工程。 （ｄ）前記砥粒層体を整形したうえ円筒状のビット本体
の端面に同軸状に固定する工程。On the other hand, the method of manufacturing a drill bit according to the present invention is characterized by including all the following steps. (A) A step of mixing a metal binder powder and superabrasive grains and compacting to form a large number of segment compacts. (B) A step of arranging the segment molded bodies in the annular cavity of a press die at intervals in the circumferential direction, and then filling the gap between the segment molded bodies in the cavity with metal powder. (C) The filled metal powder and segment compact are integrally powder compacted and hot pressed to form segment compacts as abrasive grain layer segments having a density ratio of 90% or more, and adjacent abrasive grain layers. A step of integrally forming a porous crosslinked portion having a density ratio of 60 to 80% between the segments to obtain an annular abrasive grain layer body as a whole. (D) A step of shaping the abrasive grain layered body and coaxially fixing it to the end face of the cylindrical bit body.
【０００７】[0007]
【作用】本発明の穿孔ビットを使用するには、穿孔ビッ
トを軸回りに回転させ、その先端を被削材に押し当てつ
つ、ビット本体の軸部を通して遊離砥粒を連続的に供給
する。すると、ビット本体内に供給された遊離砥粒は、
砥粒層セグメントおよび多孔質架橋部と、被削材との隙
間に侵入する。架橋部の先端面と砥粒層セグメントの研
削面は面一になっているから、侵入した遊離砥粒は、こ
れらの面と被削材との隙間に沿って転動し、それにつれ
て砥粒層セグメントの目立てを効果的に行う。To use the drill bit of the present invention, the drill bit is rotated around its axis and its tip is pressed against the work material while continuously supplying loose abrasive grains through the shaft of the bit body. Then, the loose abrasive grains supplied in the bit body are
It penetrates into the gap between the abrasive grain layer segment and the porous bridge portion and the work material. Since the tip surface of the bridge portion and the grinding surface of the abrasive grain layer segment are flush with each other, the loose abrasive particles that have infiltrated roll along the gap between these surfaces and the work material, and the abrasive particles accordingly. Effectively sharpen layer segments.
【０００８】架橋部は砥粒層セグメントより摩耗しやす
い多孔質焼結体で成形されているから、遊離砥粒によっ
て砥粒層セグメントよりも常に僅かに早く摩耗し、砥粒
層セグメントの被削材への食い込みを阻害することがな
い。これにより、砥粒層セグメントは被削材を研削しつ
つ、遊離砥粒により目立てされ、切れ味が常に良好に維
持されるとともに、切粉の排出性も高められ、長期に亙
って良好な研削効率が得られる。Since the bridging portion is formed of a porous sintered body which is more easily worn than the abrasive layer segment, free abrasive grains always wear it slightly faster than the abrasive layer segment, so that the abrasive layer segment is abraded. It does not hinder the bite into the material. As a result, the abrasive grain layer segment is sharpened by the loose abrasive grains while grinding the work material, the sharpness is always maintained good, and the chip discharge property is also improved, resulting in good grinding over a long period of time. Efficiency is obtained.
【０００９】一方、本発明に係る穿孔ビットの製造方法
によれば、砥粒層セグメントと多孔質架橋部をそれぞれ
適当な密度比で成形することが可能であり、しかも互い
の接合強度および成形寸法精度は高く確保できる。した
がって、良好な切れ味を長期に亙って保ち得る穿孔用ビ
ットが容易に製造できる。On the other hand, according to the method for manufacturing a perforated bit according to the present invention, it is possible to mold the abrasive grain layer segment and the porous cross-linked portion respectively at appropriate density ratios, and further, to bond them to each other and the molding dimension. High accuracy can be secured. Therefore, it is possible to easily manufacture a drill bit capable of maintaining good sharpness for a long period of time.
【００１０】[0010]
【実施例】図１は、本発明に係る穿孔ビットの一実施例
を示す縦断面図である。図中符号１は円筒形のビット本
体であり、その一端部には円筒状の軸部２が同軸に形成
されている。ビット本体１の他端面には、多数の円弧状
の砥粒層セグメント３が、周方向に一定間隔を空けて１
列に並んで固定され、これら砥粒層セグメント３の間に
は、図２および図３に示すように本発明の特徴点である
多孔質架橋部４が砥粒層セグメント３と一体的に形成さ
れている。砥粒層セグメント３の幅は、図１に示すよう
にビット本体１の肉厚よりも大きく、砥粒層セグメント
３とビット本体１の幅方向の中心線が一致している。1 is a longitudinal sectional view showing an embodiment of a punch bit according to the present invention. Reference numeral 1 in the drawing is a cylindrical bit body, and a cylindrical shaft portion 2 is coaxially formed at one end thereof. A large number of arc-shaped abrasive grain layer segments 3 are provided on the other end surface of the bit body 1 at regular intervals in the circumferential direction.
As shown in FIGS. 2 and 3, the porous bridge portions 4, which are the characteristic feature of the present invention, are integrally formed with the abrasive grain layer segments 3 between the abrasive grain layer segments 3 which are fixed in line. Has been done. The width of the abrasive grain layer segment 3 is larger than the wall thickness of the bit body 1 as shown in FIG. 1, and the center lines in the width direction of the abrasive grain layer segment 3 and the bit body 1 coincide with each other.
【００１１】砥粒層セグメント３は、ダイヤモンドやＣ
ＢＮ等の超砥粒を金属結合剤粉末とともに混合し、圧粉
成形およびホットプレスして製造されたものである。The abrasive grain layer segment 3 is made of diamond or C.
It is manufactured by mixing superabrasive grains such as BN together with the metal binder powder, compacting and hot pressing.
【００１２】各多孔質架橋部４の先端面は、隣接する各
砥粒層セグメント３の研削面と面一に連続していること
が必要で、この例ではさらに、多孔質架橋部４の幅が砥
粒層セグメント３の幅と同一になっている。砥粒層セグ
メント３の幅と多孔質架橋部４の幅は必ずしも同一でな
くともよく、多孔質架橋部４の幅は砥粒層セグメント３
の幅より小さくても本発明の効果は得られる。It is necessary that the tip end surface of each porous bridge portion 4 is flush with the grinding surface of each adjacent abrasive grain layer segment 3, and in this example, the width of the porous bridge portion 4 is further increased. Is the same as the width of the abrasive layer segment 3. The width of the abrasive grain layer segment 3 and the width of the porous crosslinked portion 4 do not necessarily have to be the same, and the width of the porous crosslinked portion 4 is the width of the abrasive grain layer segment 3
Even if the width is smaller than the width, the effect of the present invention can be obtained.
【００１３】多孔質架橋部４は、砥粒層セグメント３を
構成する金属結合材よりも密度比の小さい多孔質の金属
焼結体からなるもので、金属結合材よりも軟質になるよ
うに、前記金属結合材と同じ金属か、あるいはそれより
も軟質な金属で形成されていることが望ましい。具体的
な材質としては、金属結合材および多孔質架橋部４とも
Ｃｕ，Ｚｎ，Ｓｎ，Ａｌ，Ｃｏ，Ａｇ，Ｎｉあるいはこ
れらの合金などが好適である。The porous bridging portion 4 is made of a porous metal sintered body having a density ratio smaller than that of the metal binder constituting the abrasive grain layer segment 3, and is made softer than the metal binder. It is desirable to be formed of the same metal as the metal binder or a softer metal. As a specific material, Cu, Zn, Sn, Al, Co, Ag, Ni, or alloys thereof are suitable for both the metal binder and the porous cross-linking portion 4.
【００１４】砥粒層セグメント３の密度比は９０％以
上、多孔質架橋部４の密度比は６０〜８０％程度が好ま
しい。砥粒層セグメント３の密度比が９０％未満では十
分な切れ味が得られない。また、多孔質架橋部４の密度
比が６０％より小さいと架橋部４が摩耗しすぎて砥粒を
まんべんなく行き渡らす効果に乏しくなり、逆に８０％
より大きいと架橋部４が摩耗しにくく、砥粒層セグメン
ト３の被削材への食い込みを阻害する。The abrasive grain layer segment 3 preferably has a density ratio of 90% or more, and the porous crosslinked portion 4 preferably has a density ratio of about 60 to 80%. If the density ratio of the abrasive grain layer segment 3 is less than 90%, sufficient sharpness cannot be obtained. Further, if the density ratio of the porous crosslinked portion 4 is less than 60%, the crosslinked portion 4 is excessively worn and the effect of evenly distributing the abrasive grains becomes poor, and conversely 80%.
If it is larger, the bridging portion 4 is less likely to wear, and the abrasive grain layer segment 3 is prevented from biting into the work material.
【００１５】次に、上記穿孔ビットの製造方法の一実施
例を説明する。まず、金属結合材粉末および超砥粒を所
定の割合で均一に混合し、プレス型内で圧粉成形し、多
数のセグメント成形体３Ａを形成する。この時点での密
度比は低く設定される。プレス温度は常温または焼結温
度未満とし、この時点では焼結を行わないようにする。
セグメント成形体は、平面視した形状が砥粒層セグメン
ト３とほぼ等しく、高さは砥粒層セグメント３より大き
い。これは密度比が小さいためである。Next, an embodiment of the method for manufacturing the above-mentioned punch bit will be described. First, the metal binder powder and the superabrasive grains are uniformly mixed at a predetermined ratio and compacted in a press die to form a large number of segment compacts 3A. The density ratio at this point is set low. The pressing temperature is normal temperature or lower than the sintering temperature, and sintering is not performed at this point.
The shape of the segment molded body in plan view is substantially equal to that of the abrasive grain layer segment 3, and the height thereof is larger than that of the abrasive grain layer segment 3. This is because the density ratio is small.
【００１６】次いで、これら円弧状のセグメント成形体
３Ａを、図４に示すようにホットプレス型Ｐ１，Ｐ２間
の円環状キャビティＣ内に周方向に向けて間隔を空けて
配置した後、前記キャビティＣ内におけるセグメント成
形体３Ａの間隙に、金属粉４Ａを充填する。金属粉４Ａ
の充填高さはセグメント成形体３Ａより高く設定され
る。ただし、セグメント成形体３Ａの密度比が低い場合
には、図６に示すようにセグメント成形体３Ａと同じ高
さまで充填することも可能である。必要に応じては、プ
レス型Ｐ１，Ｐ２の、セグメント成形体３Ａをプレスす
る部分と、金属粉４Ａをプレスする部分とを別体にし、
別個に駆動することにより、金属粉４Ａの充填高さおよ
び成形密度比を任意に変更できるようにしてもよい。Next, as shown in FIG. 4, these arc-shaped segment molded bodies 3A are circumferentially arranged in an annular cavity C between the hot press molds P1 and P2 with a space therebetween. The space between the segment molded bodies 3A in C is filled with the metal powder 4A. Metal powder 4A
The filling height is set higher than that of the segment molded body 3A. However, when the density ratio of the segment molded body 3A is low, it is also possible to fill up to the same height as the segment molded body 3A as shown in FIG. If necessary, the press dies P1 and P2 may be separated into a part for pressing the segment molded body 3A and a part for pressing the metal powder 4A,
By separately driving, the filling height and the molding density ratio of the metal powder 4A may be arbitrarily changed.
【００１７】プレス型Ｐ１，Ｐ２間にセグメント成形体
３Ａおよび金属粉４Ａを充填したら、これらをホットプ
レスして図５に示すような砥粒層体Ｓを成形する。ホッ
トプレス条件は、金属粉４Ａの成形密度比が前述したよ
うに６０〜８０％程度になるようにする。ホットプレス
を使用するのは、通常の焼結法では砥粒層体Ｓの径が縮
小し、ビット本体１の端面に正確に位置決めして砥粒層
体Ｓを固定することが困難になるからである。After the segment compact 3A and the metal powder 4A are filled between the press dies P1 and P2, these are hot pressed to form an abrasive grain layer S as shown in FIG. The hot pressing conditions are such that the molding density ratio of the metal powder 4A is about 60 to 80% as described above. The hot pressing is used because the diameter of the abrasive grain layer body S is reduced by a normal sintering method, and it becomes difficult to position the abrasive grain layer body S accurately on the end surface of the bit body 1 and fix it. Is.
【００１８】この実施例では、図５に示すように各砥粒
層セグメント３の上に、多孔質架橋部４よりも密度比の
高い（ほぼ砥粒層セグメント３と同程度の密度比にな
る）部分５が形成されるが、これら部分５はツルーイン
グ（整形）により除去しても良いし、あるいは残してビ
ット本体１への接合部として利用しても良い。In this embodiment, as shown in FIG. 5, the density ratio on the abrasive grain layer segments 3 is higher than that of the porous crosslinked portions 4 (the density ratio is almost the same as that of the abrasive grain layer segments 3). ) The portions 5 are formed, but these portions 5 may be removed by truing (shaping), or may be left and used as a joint portion to the bit body 1.
【００１９】砥粒層体Ｓを必要に応じてツルーイングし
たうえ、ビット本体１の端面に同軸状に固定する。固定
方法としては、各種溶接法が放熱性および強度の点から
好適である。The abrasive grain layer S is trued if necessary, and is fixed coaxially to the end face of the bit body 1. As a fixing method, various welding methods are suitable in terms of heat dissipation and strength.
【００２０】次に、上記穿孔ビットを使用した穿孔方法
を説明する。この方法ではまず、図１に示すように穿孔
ビット１を回転させつつ、被削材Ｗに押し当てて切込み
を開始すると同時に、ビット本体１の中空軸部２を通し
てビット本体１内に遊離砥粒を供給する。Next, a punching method using the above punching bit will be described. In this method, first, as shown in FIG. 1, while rotating the perforated bit 1, the perforated bit 1 is pressed against the work material W to start cutting, and at the same time, the loose abrasive grains are inserted into the bit body 1 through the hollow shaft portion 2 of the bit body 1. To supply.
【００２１】遊離砥粒としては、ダイヤモンド，ＣＢＮ
等の超砥粒や、あるいはＳiＯ、Ａl2Ｏ3などの一般砥粒
が使用可能であり、粉末状態のまま、あるいは一般的に
使用される研削液に添加されてスラリー状態で供給され
る。遊離砥粒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３中の砥
粒の平均粒径の１００〜３０％程度が好ましい。As loose abrasive grains, diamond, CBN
It is possible to use superabrasive grains such as or the like, or general abrasive grains such as SiO or Al 2 O 3 , and they are supplied in a powder state or in a slurry state after being added to a commonly used grinding liquid. Although the average particle size of the loose abrasive grains is not necessarily limited, it is preferably about 100 to 30% of the average particle size of the abrasive grains in the abrasive grain layer segment 3 in order to enhance the dressing effect.
【００２２】ビット本体１内に供給された遊離砥粒の一
部は、砥粒層セグメント３および多孔質架橋部４と被削
材Ｗとの界面に入り込み、多孔質架橋部４を適宜摩耗さ
せるとともに、砥粒層セグメント３の研削面に露出する
結合材相を削り、砥粒層セグメント３中に埋もれている
超砥粒を発刃させて、砥粒層セグメント３を目立てす
る。目立てに使用された遊離砥粒は、穿孔ビットの回転
につれ順次ビットの外側に排出され、それとともに切粉
も運ばれる。多孔質架橋部４の表面には無数の凹凸が存
在するため、これら凹凸により切粉が掃き出され、切粉
排出性はきわめて良好である。したがって、上記構成か
らなる穿孔ビットによれば、前述した目立て作用によ
り、砥粒層セグメント３の切れ味が常に良好に維持され
るとともに、切粉の排出性も高められ、長期に亙って良
好かつ安定した切れ味が得られる。A part of the loose abrasive grains supplied into the bit body 1 enters the interface between the abrasive grain layer segment 3 and the porous cross-linking portion 4 and the work material W, and wears the porous cross-linking portion 4 appropriately. At the same time, the binder phase exposed on the ground surface of the abrasive grain layer segment 3 is scraped off, and the superabrasive grains buried in the abrasive grain layer segment 3 are bladed to sharpen the abrasive grain layer segment 3. The loose abrasive grains used for dressing are sequentially discharged to the outside of the bit as the drill bit rotates, and the chips are also carried with it. Since there are innumerable irregularities on the surface of the porous cross-linked portion 4, chips are swept out by these irregularities, and the chip discharging property is extremely good. Therefore, according to the perforated bit having the above-mentioned configuration, the sharpening effect of the abrasive grain layer segment 3 allows the sharpness of the abrasive grain layer segment 3 to be always maintained at a good level, and the discharge property of the chips is enhanced, which is good for a long period of time. A stable sharpness is obtained.
【００２３】これに対し、砥粒層セグメント３の間に多
孔質架橋部４が存在しなければ、遊離砥粒が各砥粒層セ
グメント３の間隙を通って外周側に通り抜けてしまい、
砥粒層セグメント３と被削材との界面に導入されにく
く、遊離砥粒による目立て効果が著しく低下する。On the other hand, if the porous bridging portion 4 does not exist between the abrasive grain layer segments 3, the loose abrasive grains pass through the gaps between the abrasive grain layer segments 3 to the outer peripheral side,
It is hard to be introduced into the interface between the abrasive grain layer segment 3 and the work material, and the dressing effect of the loose abrasive grains is significantly reduced.
【００２４】次に、図７は穿孔ビットの第２実施例を示
し、この例では、各砥粒層セグメント３のビット回転方
向先端側の端面が、ビット内周側にいくほど回転方向前
方に位置する傾斜面６になっていることを特徴とする。
他の構成は前記実施例と同様である。Next, FIG. 7 shows a second embodiment of the perforated bit. In this example, the end face of each abrasive grain layer segment 3 on the tip side in the bit rotation direction is moved forward in the rotation direction toward the inner circumference side of the bit. It is characterized in that it is an inclined surface 6 located.
The other structure is the same as that of the above embodiment.
【００２５】砥粒層セグメント３の先端は、多孔質架橋
部４よりも常に僅かに突出するため、ビット本体１の内
周側から供給された遊離砥粒は、穿孔ビットの回転に伴
い、砥粒層セグメント３の傾斜面６のエッジにより外周
側へ徐々に移送されつつ砥粒層セグメント３の目立てを
行う。その過程で、生成した切粉も遊離砥粒と一緒にビ
ット外周側へ運ばれるので、前記実施例に比して切粉排
出性がさらによくなり、砥粒層セグメント３の目詰まり
防止効果が高められる利点を有する。Since the tip of the abrasive grain layer segment 3 always slightly protrudes from the porous bridge portion 4, the loose abrasive grains supplied from the inner peripheral side of the bit main body 1 are abraded as the drill bit rotates. The abrasive layer segment 3 is dressed while being gradually transferred to the outer peripheral side by the edge of the inclined surface 6 of the grain layer segment 3. In the process, the generated cutting chips are also carried to the outer peripheral side of the bit together with the loose abrasive grains, so that the chip discharging property is further improved as compared with the above-mentioned embodiment, and the effect of preventing clogging of the abrasive grain layer segment 3 is achieved. Has the advantage of being enhanced.
【００２６】図８は穿孔ビットの第３実施例を示し、こ
の例では、全ての砥粒層セグメント３の回転方向前端面
７を凸Ｖ字状、後端面８を凹Ｖ字状に形成したことを特
徴とする。このように形成すると、砥粒層セグメント３
と多孔質架橋部４との接合強度を向上することができ、
多孔質架橋部４の脱落などのおそれを低減することがで
きる。FIG. 8 shows a third embodiment of the perforated bit. In this example, the front end faces 7 in the rotational direction of all the abrasive grain layer segments 3 are formed in a convex V shape and the rear end faces 8 are formed in a concave V shape. It is characterized by When formed in this manner, the abrasive grain layer segment 3
It is possible to improve the bonding strength between the porous crosslinked portion 4 and
It is possible to reduce the risk of the porous cross-linked portion 4 falling off.
【００２７】なお、砥粒層セグメント３の回転方向前後
の凹凸は逆であってもよいし、両端とも凸、あるいは両
端とも凹としても同様の接合強度向上効果は得られる。
また、砥粒層セグメント３の前端面および後端面に微小
な凹凸を各種ブラスト法等により多数形成することによ
り、砥粒層セグメント３と多孔質架橋部４との接合強度
を高めることも可能である。The irregularities before and after the abrasive grain segment 3 in the direction of rotation may be reversed, and the same bonding strength improving effect can be obtained even if both ends are convex or both ends are concave.
Further, it is possible to increase the bonding strength between the abrasive grain layer segment 3 and the porous crosslinked portion 4 by forming a large number of minute irregularities on the front end face and the rear end face of the abrasive grain layer segment 3 by various blasting methods. is there.
【００２８】また、制振効果を向上する目的で、ビット
本体１を制振材料で形成することも有効である。従来か
ら実用化されている代表的な制振材料を挙げると以下の
通りである。 片状黒鉛鋳鉄やＺｌ−Ａｌ系合金等の複合型制振合
金 純Ｍｇ，Ｍｇ−０．６Ｚｒ等の転位型制振合金 Ｍｎ−３７Ｃｕ−４Ａｌ−３Ｆｅ−２Ｎｉ，Ｃｕ−
４５Ｍｎ−２Ａｌ，５０Ｎｉ−５０Ｔｉ，Ｃｕ−１４Ａ
ｌ−４Ｎｉ等の双晶型制振合金 樹脂層サンドイッチ鋼板等の複合型制振材料 強磁性型制振合金It is also effective to form the bit body 1 with a vibration damping material for the purpose of improving the vibration damping effect. Typical damping materials that have been put into practical use are as follows. Composite type damping alloy such as flake graphite cast iron and Zl-Al type alloy Dislocation type damping alloy such as pure Mg, Mg-0.6Zr Mn-37Cu-4Al-3Fe-2Ni, Cu-
45Mn-2Al, 50Ni-50Ti, Cu-14A
Twin type damping alloy such as l-4Ni, composite type damping material such as resin layer sandwich steel sheet, ferromagnetic type damping alloy
【００２９】上記の中でも特に、強磁性型制振合金
は、損失係数の周波数依存性が小さいため、他の制振材
料に比して高温時にも損失係数の減少が少ない利点を有
しており、この種の強磁性型制振合金としては、 Ｆｅ−Ａｌ−Ｓｉ系合金 Ｆｅ−０．１Ｃ−１２Ｃｒ−１Ａｌ系合金 Ｆｅ−１２Ｃｒ−２Ａｌ系合金 Ｆｅ−１２Ｃｒ−２Ａｌ−３Ｍｏ系合金 Ｃｏ−２２Ｎｉ−２Ｔｉ−０．５Ａｌ系合金 などが例示できる。Among the above, the ferromagnetic damping alloy has the advantage that the loss coefficient decreases less even at high temperature than other damping materials because the frequency dependence of the loss coefficient is small. As this type of ferromagnetic damping alloy, Fe-Al-Si based alloy Fe-0.1C-12Cr-1Al based alloy Fe-12Cr-2Al based alloy Fe-12Cr-2Al-3Mo based alloy Co-22Ni -2Ti-0.5Al system alloy etc. can be illustrated.
【００３０】本発明者らの実験によれば、ビット本体を
通常の鋼材で形成した場合、騒音量がデシベルＡで９５
ホンであったのに対し、ビット本体の材質をＮＫＫ株式
会社製商品名「ＮＫＫ ＳＥＲＥＮＡ」（２．５％Ａｌ
−０．５３％Ｓｉ−残部Ｆｅ）に変更すると、８０ホン
に低減することが確認されている。ビット本体の振動が
低減されれば、被削材への砥粒層セグメントの食い込み
も安定し、本発明の効果もいっそう高められる。According to the experiments conducted by the present inventors, when the bit body is made of ordinary steel, the noise level is 95 dB at decibel A.
While it was a phone, the material of the bit main body is NKK Corporation's product name "NKK SERINA" (2.5% Al
It has been confirmed that changing to -0.53% Si-balance Fe) reduces to 80 phons. If the vibration of the bit body is reduced, the abrasive grain layer segment can be stably bited into the work material, and the effect of the present invention can be further enhanced.
【００３１】[0031]
【発明の効果】以上説明したように、本発明に係る穿孔
ビットによれば、穿孔ビットを軸回りに回転させ、その
先端を被削材に押し当てつつ、ビット本体の軸部を通し
て遊離砥粒を連続的に供給することにより、ビット本体
内に供給された遊離砥粒は、砥粒層セグメントおよび多
孔質架橋部と、被削材との隙間に侵入する。架橋部の先
端面と砥粒層セグメントの研削面は面一になっているか
ら、侵入した遊離砥粒は、これらの面と被削材との隙間
に沿って転動し、それにつれて砥粒層セグメントの目立
てを効果的に行う。As described above, according to the drill bit of the present invention, the drill bit is rotated around its axis, and its tip is pressed against the work material, while the loose abrasive grains are passed through the shaft of the bit body. Is continuously supplied, the loose abrasive grains supplied into the bit body enter the gap between the abrasive grain layer segment and the porous bridge portion and the work material. Since the tip surface of the bridge portion and the grinding surface of the abrasive grain layer segment are flush with each other, the loose abrasive particles that have infiltrated roll along the gap between these surfaces and the work material, and the abrasive particles accordingly. Effectively sharpen layer segments.
【００３２】架橋部は砥粒層セグメントより摩耗しやす
い多孔質焼結体で成形されているから、遊離砥粒によっ
て砥粒層セグメントよりも常に僅かに早く摩耗し、砥粒
層セグメントの被削材への食い込みを阻害することがな
い。これにより、砥粒層セグメントは被削材を研削しつ
つ、遊離砥粒により目立てされ、切れ味が常に良好に維
持される。また、多孔質架橋部の先端面には無数の凹凸
が存在するため、これら凹凸により切粉が掃き出され、
切粉の排出性も高められ、長期に亙って良好な研削効率
が得られる。Since the bridging portion is formed of a porous sintered body which is more easily worn than the abrasive layer segment, it is always worn slightly faster than the abrasive layer segment due to loose abrasive grains, and the abrasive layer segment is abraded. It does not hinder the bite into the material. As a result, the abrasive grain layer segment is sharpened by the loose abrasive grains while grinding the work material, and the sharpness is always kept good. Further, since there are innumerable irregularities on the tip surface of the porous crosslinked portion, chips are swept out by these irregularities,
The discharge of chips is also improved, and good grinding efficiency can be obtained over a long period of time.
【００３３】一方、本発明に係る穿孔ビットの製造方法
によれば、砥粒層セグメントと多孔質架橋部をそれぞれ
適当な密度比で成形することが可能であり、しかも互い
の接合強度および成形寸法精度は高く確保できる。した
がって、良好な切れ味を長期に亙って保ち得る穿孔用ビ
ットが容易に製造できる。On the other hand, according to the method for manufacturing a drill bit according to the present invention, it is possible to mold the abrasive grain layer segment and the porous cross-linking portion respectively at appropriate density ratios, and further, to bond them to each other and the molding dimension. High accuracy can be secured. Therefore, it is possible to easily manufacture a drill bit capable of maintaining good sharpness for a long period of time.
【図１】本発明に係る穿孔ビットおよび穿孔方法の一実
施例を示す縦断面図である。FIG. 1 is a vertical cross-sectional view showing an embodiment of a drill bit and a drilling method according to the present invention.
【図２】同穿孔ビットの砥粒層セグメントおよび多孔質
架橋部の底面図である。FIG. 2 is a bottom view of the abrasive grain layer segment and the porous bridge portion of the drill bit.
【図３】同砥粒層セグメントおよび多孔質架橋部の側面
図である。FIG. 3 is a side view of the abrasive grain layer segment and the porous crosslinked portion.
【図４】本発明に係る穿孔用ビットの製造方法の一実施
例を示す縦断面図である。FIG. 4 is a vertical cross-sectional view showing an embodiment of a method for manufacturing a drill bit according to the present invention.
【図５】成形された砥粒層体を示す側面図である。FIG. 5 is a side view showing a molded abrasive grain layer body.
【図６】穿孔用ビットの製造方法の他の実施例を示す縦
断面図である。FIG. 6 is a vertical cross-sectional view showing another embodiment of the method for manufacturing a drill bit.
【図７】本発明の他の実施例の穿孔ビットの砥粒層セグ
メントおよび多孔質架橋部の底面図である。FIG. 7 is a bottom view of an abrasive grain layer segment and a porous bridge portion of a drill bit according to another embodiment of the present invention.
【図８】さらに他の実施例の穿孔ビットの砥粒層セグメ
ントおよび多孔質架橋部の底面図である。FIG. 8 is a bottom view of an abrasive grain layer segment and a porous bridge portion of a drill bit according to still another embodiment.
１ ビット本体 ２ 軸部 ３ 砥粒層セグメント ３Ａ セグメント成形体 ４ 多孔質架橋部 ４Ａ 金属粉 ５ 高密度比部分 Ｓ 砥粒層体 ６，７，８ 砥粒層セグメントの端面 Ｐ１，Ｐ２ ホットプレス型 1 Bit Main Body 2 Shaft Part 3 Abrasive Grain Layer Segment 3A Segment Formed Body 4 Porous Cross-Linked Part 4A Metal Powder 5 High Density Ratio Part S Abrasive Grain Layer Body 6, 7, 8 Edge Surface of Abrasive Grain Segment P1, P2 Hot Press Type
Claims (2)
体の基端側に同軸に設けられた中空の軸部と、前記ビッ
ト本体の先端に沿って互いに間隔を空けて固定された多
数の砥粒層セグメントとを有する穿孔ビットにおいて、 前記砥粒層セグメントは金属結合材中に超砥粒を分散し
てなる密度比９０％以上の焼結体で、隣接しあう砥粒層
セグメントの間には、密度比が６０〜８０％の多孔質金
属焼結体からなる多孔質架橋部が形成され、これら多孔
質架橋部の先端面は、各砥粒層セグメントの先端研削面
と面一に連続していることを特徴とする穿孔用ビット。1. A bit body having a cylindrical shape, a hollow shaft portion coaxially provided on the base end side of the bit body, and a large number of members fixed at intervals along the tip of the bit body. In a perforated bit having an abrasive grain layer segment, the abrasive grain layer segment is a sintered body having a density ratio of 90% or more formed by dispersing superabrasive grains in a metal binder, and between the adjacent abrasive grain layer segments. Has a porous cross-linking portion formed of a porous metal sintered body having a density ratio of 60 to 80%, and the tip surfaces of these porous cross-linking portions are flush with the tip grinding surface of each abrasive grain layer segment. Perforation bit characterized by being continuous.
穿孔用ビットの製造方法。 （ａ）金属結合材粉末および超砥粒を混合し、圧粉成形
して多数のセグメント成形体を形成する工程。 （ｂ）前記セグメント成形体をプレス型の円環状キャビ
ティ内に周方向に間隔を空けて配置したうえ、前記キャ
ビティ内で各セグメント成形体の間隙に金属粉を充填す
る工程。 （ｃ）前記充填された金属粉およびセグメント成形体を
一体的に圧粉成形およびホットプレスして、セグメント
成形体を密度比９０％以上の砥粒層セグメントとすると
ともに、隣接しあう砥粒層セグメントの間に、密度比が
６０〜８０％の多孔質架橋部を一体形成し、全体として
円環状の砥粒層体を得る工程。 （ｄ）前記砥粒層体を整形したうえ円筒状のビット本体
の端面に同軸状に固定する工程。2. A method of manufacturing a drill bit, comprising all of the following steps. (A) A step of mixing a metal binder powder and superabrasive grains and compacting to form a large number of segment compacts. (B) A step of arranging the segment molded bodies in the annular cavity of a press die at intervals in the circumferential direction, and then filling the gap between the segment molded bodies in the cavity with metal powder. (C) The filled metal powder and segment compact are integrally powder compacted and hot pressed to form segment compacts as abrasive grain layer segments having a density ratio of 90% or more, and adjacent abrasive grain layers. A step of integrally forming a porous crosslinked portion having a density ratio of 60 to 80% between the segments to obtain an annular abrasive grain layer body as a whole. (D) A step of shaping the abrasive grain layered body and coaxially fixing it to the end face of the cylindrical bit body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04310579A JP3097356B2 (en) | 1992-11-19 | 1992-11-19 | Manufacturing method of drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04310579A JP3097356B2 (en) | 1992-11-19 | 1992-11-19 | Manufacturing method of drill bit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06155447A true JPH06155447A (en) | 1994-06-03 |
| JP3097356B2 JP3097356B2 (en) | 2000-10-10 |
Family
ID=18006941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04310579A Expired - Fee Related JP3097356B2 (en) | 1992-11-19 | 1992-11-19 | Manufacturing method of drill bit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3097356B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11156724A (en) * | 1997-11-28 | 1999-06-15 | Kozo Ishizaki | Preliminary molded material and girding wheel made of said preliminary molded material having controlled abrasive grain intervals |
| KR101431196B1 (en) * | 2014-02-07 | 2014-08-18 | 임형국 | A cutting tip of core drill bit |
-
1992
- 1992-11-19 JP JP04310579A patent/JP3097356B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11156724A (en) * | 1997-11-28 | 1999-06-15 | Kozo Ishizaki | Preliminary molded material and girding wheel made of said preliminary molded material having controlled abrasive grain intervals |
| KR101431196B1 (en) * | 2014-02-07 | 2014-08-18 | 임형국 | A cutting tip of core drill bit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3097356B2 (en) | 2000-10-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6286498B1 (en) | Metal bond diamond tools that contain uniform or patterned distribution of diamond grits and method of manufacture thereof | |
| US8104464B2 (en) | Brazed diamond tools and methods for making the same | |
| US7124753B2 (en) | Brazed diamond tools and methods for making the same | |
| US9868100B2 (en) | Brazed diamond tools and methods for making the same | |
| US6159286A (en) | Process for controlling diamond nucleation during diamond synthesis | |
| US9463552B2 (en) | Superbrasvie tools containing uniformly leveled superabrasive particles and associated methods | |
| US9409280B2 (en) | Brazed diamond tools and methods for making the same | |
| US6238280B1 (en) | Abrasive cutter containing diamond particles and a method for producing the cutter | |
| US9221154B2 (en) | Diamond tools and methods for making the same | |
| US9199357B2 (en) | Brazed diamond tools and methods for making the same | |
| JPH07164325A (en) | Grinding lining for grinding tool and manufacture thereof | |
| US9238207B2 (en) | Brazed diamond tools and methods for making the same | |
| JP2002530212A (en) | Method for producing sintered articles and products produced thereby | |
| JP3097356B2 (en) | Manufacturing method of drill bit | |
| JPH06182755A (en) | Boring bit | |
| JP2972049B2 (en) | Super-abrasive wheel for precision cutting with embedded tangled chips | |
| JPS606356A (en) | Sintered minute short fiber abrasive | |
| JPH0691536A (en) | Porous metal bond grinding wheel and manufacture thereof | |
| JPS6099568A (en) | Porous metal bond grindstone and preparation thereof | |
| JPH1071569A (en) | Super abrasive grain sintered member, tool using it, and its manufacture | |
| JPH05345280A (en) | Tip structure of diamond cutting grinding wheel | |
| JP3129003B2 (en) | Drill bit | |
| JP3537367B2 (en) | Milling tools | |
| JP2003089064A (en) | Rotary truer and manufacturing method therefor | |
| JPH0420745B2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20000711 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080811 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080811 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090811 Year of fee payment: 9 |
|
| LAPS | Cancellation because of no payment of annual fees |