JP6119065B2 - Drill head - Google Patents

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JP6119065B2
JP6119065B2 JP2012170701A JP2012170701A JP6119065B2 JP 6119065 B2 JP6119065 B2 JP 6119065B2 JP 2012170701 A JP2012170701 A JP 2012170701A JP 2012170701 A JP2012170701 A JP 2012170701A JP 6119065 B2 JP6119065 B2 JP 6119065B2
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peripheral surface
guide pad
outer peripheral
drill head
flat surface
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JP2014030854A (en
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酒井　誠
誠 酒井
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Tungaloy Corp
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Description

本発明は、主として深孔の切削に使用されるドリルヘッドに関するものである。   The present invention relates to a drill head mainly used for cutting deep holes.

この種のドリルヘッドは、例えば下記特許文献１に記載されているように、ヘッド本体先端部に切削刃を取り付けると共に、ヘッド本体の先端部外周面の周方向複数箇所にガイドパッドをロー付けにより一体に又はビスにより付け替え可能に取り付けたもので、ヘッド本体に設けた取付孔を利用して工具シャンク等の先端に取り付けて、ドリルヘッド側を回転させるか、又は被削材側を回転させることによって切削加工を行なう。そして、ガイドパッドは、超硬材によって形成されたもので、切削中に被削材の切削孔の内周面に摺接して、切削刃による切削反力を受け止めながら、切削中のヘッド本体の振れや直進性の低下を防止する重要な機能・役割を有している。   In this type of drill head, for example, as described in Patent Document 1 below, a cutting blade is attached to the tip of the head main body, and guide pads are brazed to a plurality of circumferential positions on the outer peripheral surface of the head main body. Attached to the tip of a tool shank using a mounting hole provided in the head body and rotated on the drill head side or on the work material side. The cutting process is performed. The guide pad is formed of a super hard material, is in sliding contact with the inner peripheral surface of the cutting hole of the work material during cutting, receives the cutting reaction force by the cutting blade, and It has important functions and roles to prevent runout and deterioration of straightness.

特開２００３−２１１３１１号公報JP 2003-211311 A

上記特許文献１に記載のような従来のドリルヘッドのガイドパッドは、パッド外周面の全体が、被削材の切削孔内周面に沿うような円弧面に形成されていることから、切削中に被削材の切削孔内周面との接触摩擦により、パッド外周面の全体が極めて高温に発熱すると共に、パッド外周面の摩耗が激しく、そのためにガイドパッド本来の機能が損なわれ、切削孔の孔加工精度が悪化するといった問題がある。   Since the guide pad of the conventional drill head as described in Patent Document 1 is formed in an arc surface along the inner peripheral surface of the cutting hole of the work material, the entire pad outer peripheral surface is being cut. In addition, due to contact friction with the inner peripheral surface of the cutting hole of the work material, the entire pad outer peripheral surface generates heat to an extremely high temperature, and the pad outer peripheral surface is severely worn. There is a problem that the drilling accuracy of the steel deteriorates.

本発明は、上記の事情に鑑み、ガイドパッドの本来の機能を十分に発揮できると共に、孔加工精度を悪化させることのないドリルヘッドを提供することを目的とする。   An object of this invention is to provide the drill head which can fully exhibit the original function of a guide pad, and does not deteriorate a hole drilling precision in view of said situation.

上記課題を解決するための手段を、後述する実施形態の参照符号を付して説明すると、請求項１に係る発明は、ヘッド本体２の外周に複数個のガイドパッド４，５を取り付けたドリルヘッドにおいて、
少なくとも１個のガイドパッド４の外周面４ａは、フラット面８と、被削材Ｗの切削孔１０の内周面１０ａに摺接する複数の円弧面７，７と、を有し、前記フラット面８の両側は前記円弧面７，７と接続してなることを特徴とする。 Means for solving the above problems will be described with reference numerals of the embodiments described later. The invention according to claim 1 is a drill in which a plurality of guide pads 4 and 5 are attached to the outer periphery of the head body 2. In the head
The outer peripheral surface 4a of at least one guide pad 4 has a flat surface 8 and a plurality of arc surfaces 7 and 7 that are in sliding contact with the inner peripheral surface 10a of the cutting hole 10 of the work material W. The flat surface Both sides of 8 are connected to the circular arc surfaces 7 and 7 .

上記解決手段による発明の効果を、後述する実施形態の参照符号を付して説明すると、請求項１に係る発明のドリルヘッドによれば、ガイドパッド４の外周面４ａには、被削材Ｗの切削孔１０の内周面１０ａに摺接する円弧面７が周方向に複数設けられて、これら円弧面７，７間にはフラット面８が形成され、フラット面８と切削孔１0の内周面１０ａとの間に隙間ｓが形成されてなるため、孔切削加工時に、フラット面８のところでは発熱が生じ難く、しかもフラット面８と切削孔１０の内周面１０ａとの間に形成された隙間ｓが切削油の通り道となって切削油が浸入し、この切削油の浸入によってガイドパッド４が冷却効果が高められ、ガイドパッド４の発熱が阻止される。また、前記隙間ｓによってガイドパッド４の発熱が阻止されると共に、隙間ｓへの油の浸入によりパッド外周面４ａの摩耗が減少するから、ガイドパッド４本来の機能が損なわれることがなく、切削孔の孔加工精度を悪化させることがなく、また動力の消費も軽減できる。
また、ガイドパッド４の外周面４ａに周方向に複数設けた円弧面７，７間には、フラット面８以外に、例えば凹溝を形成することも考えられるが、本発明では、ガイドパッド４の外周面４ａは、フラット面８と、前記フラット面の両側は前記円弧面７，７に接続しており、フラット面が凹溝を含むものではなく、文字どおりフラットな面によって形成されることを特徴とする。これがために、ガイドパッド４が非常に硬い超硬材で形成されることから、凹溝の加工に比べて、本発明のフラット面８の加工の方がはるかに簡単容易となり、従ってガイドパッド４のコストを低減できる。 The effect of the invention by the above-described solution means will be described with reference numerals of the embodiments described later. According to the drill head of the invention according to claim 1, the work material W is provided on the outer peripheral surface 4a of the guide pad 4. A plurality of arc surfaces 7 slidably contacting the inner peripheral surface 10a of the cutting hole 10 are provided in the circumferential direction, and a flat surface 8 is formed between the arc surfaces 7 and 7, and the inner periphery of the flat surface 8 and the cutting hole 10 is Since a gap s is formed between the flat surface 8 and the surface 10 a, it is difficult to generate heat at the flat surface 8 during the hole cutting process. The gap s becomes a passage for the cutting oil, and the cutting oil enters. The penetration of the cutting oil increases the cooling effect of the guide pad 4 and prevents the guide pad 4 from generating heat. Further, since the heat generation of the guide pad 4 is prevented by the gap s, and the wear of the pad outer peripheral surface 4a is reduced by the penetration of oil into the gap s, the original function of the guide pad 4 is not impaired and the cutting is performed. The hole drilling accuracy is not deteriorated, and power consumption can be reduced.
In addition to the flat surface 8, for example, a concave groove may be formed between the circular arc surfaces 7 and 7 provided in the circumferential direction on the outer peripheral surface 4a of the guide pad 4, but in the present invention, the guide pad 4 The outer peripheral surface 4a is connected to the flat surface 8 and both sides of the flat surface to the circular arc surfaces 7 and 7, and the flat surface does not include a concave groove, and is literally formed by a flat surface. Features. For this reason, since the guide pad 4 is formed of a very hard super hard material, the processing of the flat surface 8 of the present invention is much easier and easier than the processing of the concave groove, and therefore the guide pad 4 The cost can be reduced.

(a) は本発明に係るドリルヘッドの一実施形態を示す斜視図、(b) は同ドリルヘッドの平面図である。(a) is a perspective view which shows one Embodiment of the drill head based on this invention, (b) is a top view of the drill head. (a) は図１のドリルヘッドの正面図、(b) はヘッド本体に取り付けられたガイドパッドの拡大断面図である。(a) is a front view of the drill head of FIG. 1, and (b) is an enlarged cross-sectional view of a guide pad attached to the head body. (a) は本発明に係るドリルヘッドの他の実施形態の斜視図、(b) は同ドリルヘッドの平面図である。(a) is a perspective view of another embodiment of the drill head according to the present invention, and (b) is a plan view of the drill head. (a) 及び(b) はガイドパッドの他の実施形態を示す断面図である。(a) And (b) is sectional drawing which shows other embodiment of a guide pad.

以下に本発明の好適な実施形態を図面に基づいて説明すると、図１の(a) ，(b) 及び図２の(a) に示すように、ドリルヘッド１は、先端部側が閉塞され、基端部が開口した中空状のヘッド本体２を有し、ヘッド本体２の円錐状先端面２ａに複数の切削刃３が夫々ロー付けにより取り付けられると共に、ヘッド本体２の先端部外周面２ｂに大小２個のガイドパッド４，５が周方向に間隔をおいて夫々ロー付けによって取り付けられている。また、ヘッド本体２の基端部側外周には雄ねじ６が形成されており、この基端部側雄ねじ６を、図示しない中空状ボーリングバーの先端側雌ねじに螺入し、このボーリングバーを工作機械のスピンドル等の駆動軸に連結して回転させるか、又は被削材を回転させることにより、ドリルヘッド１の切削刃３で被削材Ｗの深孔切削加工を行なう。   A preferred embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1A and 1B and FIG. 2A, the drill head 1 is closed at the tip side. A hollow head main body 2 having an open base end is provided, and a plurality of cutting blades 3 are respectively attached to the conical tip surface 2a of the head main body 2 by brazing, and are attached to the outer peripheral surface 2b of the tip end of the head main body 2. Two large and small guide pads 4, 5 are attached by brazing at intervals in the circumferential direction. A male screw 6 is formed on the outer periphery of the base end portion of the head main body 2, and the base end side male screw 6 is screwed into a tip-side female screw of a hollow boring bar (not shown). Deep hole cutting of the work material W is performed with the cutting blade 3 of the drill head 1 by rotating the work material connected to a drive shaft such as a machine spindle.

上記ガイドパッド４，５は、１つの材質（例えば、超硬材）で形成されると共に、図２（ａ）に示すように正面視半月型に形成されている。このように形成される２個のガイドパッド４，５のうち、図１の(a) ，(b) 及び図２の(a) ，(b) から分かるように、周方向の幅が広いガイドパッド４の外周面４ａには、被削材Ｗの切削孔１０の内周面１０ａに摺接する円弧面７が、周方向の中央部を残してその両側に２つ形成されると共に、両円弧面７，７の間には平坦なフラット面８が形成されている。尚、図２の(a) 及び(b) にはフラット面８の周方向幅をδで示し、またフラット面８と切削孔１０の内周面１０ａとの間に形成される隙間を図２の(b) にｓで示している。また、ガイドパッド４の外周面には周方向両側端部に面取り部９ａ，９ａが形成されると共に、軸方向前後端部に面取り部９ｂ，９ｂが形成されている。尚、フラット面８の周方向幅δは任意の寸法とする。   The guide pads 4 and 5 are formed of one material (for example, cemented carbide) and are formed in a half-moon shape in front view as shown in FIG. Of the two guide pads 4 and 5 formed in this way, as shown in FIGS. 1A and 1B and FIGS. 2A and 2B, the guide having a wide circumferential width is used. On the outer peripheral surface 4a of the pad 4, two arc surfaces 7 slidably in contact with the inner peripheral surface 10a of the cutting hole 10 of the work material W are formed on both sides except for the central portion in the circumferential direction. A flat flat surface 8 is formed between the surfaces 7 and 7. 2 (a) and 2 (b), the circumferential width of the flat surface 8 is indicated by δ, and the gap formed between the flat surface 8 and the inner peripheral surface 10a of the cutting hole 10 is shown in FIG. This is indicated by s in (b). Further, chamfered portions 9a and 9a are formed at both ends in the circumferential direction on the outer peripheral surface of the guide pad 4, and chamfered portions 9b and 9b are formed at the front and rear end portions in the axial direction. The circumferential width δ of the flat surface 8 is an arbitrary dimension.

上記のようなガイドパッド４を取り付けたヘッド本体２を備えたドリルヘッド１により被削材Ｗの深孔切削加工を行なう時に、ガイドパッド４の外周面４ａには、図２の(b) に示すように、そのフラット面８と被削材Ｗの切削孔１０の内周面１０ａとの間に隙間ｓが形成されるから、ガイドパッド４は、フラット面８のところでは発熱が生じ難く、しかもこの隙間ｓが切削油の通り道となって切削油が浸入し、この切削油の浸入によってガイドパッド４に対する冷却効果が高められ、ガイドパッド４の発熱が阻止される。また、そのような隙間ｓによってガイドパッド４の発熱が阻止されると共に、隙間ｓへの油の浸入によってパッド外周面４ａの摩耗が著しく減少するから、ガイドパッド４本来の機能が損なわれることがなく、切削孔の孔加工精度を悪化させることがなく、動力の消費も軽減できる。   When the drill head 1 having the head body 2 to which the guide pad 4 is attached as described above performs the deep hole cutting of the work material W, the outer peripheral surface 4a of the guide pad 4 is shown in FIG. As shown, since a gap s is formed between the flat surface 8 and the inner peripheral surface 10a of the cutting hole 10 of the work material W, the guide pad 4 is unlikely to generate heat at the flat surface 8. In addition, the gap s serves as a passage for the cutting oil, and the cutting oil enters. The penetration of the cutting oil enhances the cooling effect on the guide pad 4 and prevents the guide pad 4 from generating heat. In addition, heat generation of the guide pad 4 is prevented by such a gap s, and wear of the pad outer peripheral surface 4a is remarkably reduced due to oil intrusion into the gap s, so that the original function of the guide pad 4 is impaired. In addition, the drilling accuracy of the cutting hole is not deteriorated, and power consumption can be reduced.

図３の(a) は本発明に係る他の実施形態によるドリルヘッド１１を示す斜視図であり、(b) は同ドリルヘッド１１の平面図である。ここに示すドリルヘッド１１は、図１に示すドリルヘッド１と異なるところは、複数個の切削刃３がヘッド本体２の先端面２ａに夫々ビス１２で付け替え可能に取り付けられると共に、２個のガイドパッド４，５がヘッド本体２の先端部外周面２ｂに周方向に間隔をおいて夫々ビス１３で付け替え可能に取り付けられている点である。   FIG. 3A is a perspective view showing a drill head 11 according to another embodiment of the present invention, and FIG. 3B is a plan view of the drill head 11. The drill head 11 shown here is different from the drill head 1 shown in FIG. 1 in that a plurality of cutting blades 3 are attached to the front end surface 2a of the head body 2 so as to be replaceable with screws 12, respectively, and two guides are provided. The pads 4 and 5 are attached to the outer peripheral surface 2b of the front end portion of the head body 2 so as to be replaceable with screws 13 at intervals in the circumferential direction.

そして、このドリルヘッド１の２個のガイドパッド４，５の一方のガイドパッド４は、図３の(a) ，(b) に示すようにドリルヘッド１の軸方向に長い直方体で、その外周面４ａは、長手方向中央部に凹設された凹段部１４のところで、先方側の外周面４ａと後方側外周面４ａとに２分されていて、その凹段部１４に設けられたビス挿通孔（図示せず）からドリルヘッド１にねじ込まれたビス１３によって固定されている。   One guide pad 4 of the two guide pads 4 and 5 of the drill head 1 is a rectangular parallelepiped that is long in the axial direction of the drill head 1 as shown in FIGS. 3 (a) and 3 (b). The surface 4a is divided into a front-side outer peripheral surface 4a and a rear-side outer peripheral surface 4a at the concave step portion 14 provided in the central portion in the longitudinal direction, and the screw provided in the concave step portion 14 It is fixed by a screw 13 screwed into the drill head 1 from an insertion hole (not shown).

そして、先方側及び後方側の各外周面４ａには、図２の(a) ，(b) を参照して分かるように、被削材Ｗの切削孔１０の内周面１０ａに摺接する円弧面７が、周方向に間隔をおいて２つ形成されると共に、両円弧面７，７の間に平坦なフラット面８が形成されている。また、上記各外周面４ａには周方向両側端部に面取り部９ａ，９ａが形成されると共に、軸方向前後端部に面取り部９ｂ，９ｂが形成されている。   Further, as can be seen with reference to FIGS. 2A and 2B, the front and rear outer peripheral surfaces 4a have arcs slidably contacting the inner peripheral surface 10a of the cutting hole 10 of the work material W. Two surfaces 7 are formed at intervals in the circumferential direction, and a flat flat surface 8 is formed between the circular arc surfaces 7 and 7. In addition, chamfered portions 9a and 9a are formed at both end portions in the circumferential direction on each outer peripheral surface 4a, and chamfered portions 9b and 9b are formed at front and rear end portions in the axial direction.

以上、図１〜図３によって説明したドリルヘッド１，１１では、ガイドパッド４の外周面４ａに、切削孔１０の内周面１０ａに摺接する円弧面７を周方向両側に２つ設け、これら２つの円弧面７，７間にフラット面８を形成した構成となっているが、図４には他の構成を示す。即ち、図４の(a) に示すガイドパッド４は、外周面４ａの周方向中央部を挟んでその両側に円弧面７，７を形成し、両円弧面７，７の間に周方向幅がδのフラット面８を形成し、その両円弧面７，７の夫々外側に夫々周方向幅がδのフラット面８を形成し、更にこのフラット面８の外側に円弧面７を形成したものである。尚、フラット面８の周方向幅δは任意の寸法とする。   As described above, in the drill heads 1 and 11 described with reference to FIGS. 1 to 3, two circular arc surfaces 7 slidably contacting the inner peripheral surface 10 a of the cutting hole 10 are provided on the outer peripheral surface 4 a of the guide pad 4 on both sides in the circumferential direction. Although the flat surface 8 is formed between the two arcuate surfaces 7, 7, another configuration is shown in FIG. That is, the guide pad 4 shown in FIG. 4 (a) has circular arc surfaces 7 and 7 formed on both sides of the circumferential central portion of the outer peripheral surface 4a, and the circumferential width between the circular arc surfaces 7 and 7 is formed. Formed a flat surface 8 having a diameter δ, a flat surface 8 having a circumferential width δ formed on the outer sides of both arc surfaces 7 and 7, and an arc surface 7 formed on the outer side of the flat surface 8. It is. The circumferential width δ of the flat surface 8 is an arbitrary dimension.

図４の(b) に示すガイドパッド４は、ガイドパッド４の外周面４ａの周方向両端部側に円弧面７，７を形成し、両円弧面７，７の間に、夫々周方向幅がδの一対のフラット面８，８を並設したもので、両フラット面８，８は所定の対向角度で交差した状態にある。   The guide pad 4 shown in FIG. 4 (b) has circular arc surfaces 7 and 7 formed on both ends in the circumferential direction of the outer peripheral surface 4a of the guide pad 4, and the circumferential width between the circular arc surfaces 7 and 7, respectively. Is a parallel arrangement of a pair of flat surfaces 8, 8, and the flat surfaces 8, 8 intersect each other at a predetermined facing angle.

また上述した実施形態のドリルヘッド１，１１では、複数個設けられたガイドパッド４，５のうちの１個のガイドパッド４に外周面４ａに複数の円弧面７を形成したが、全てのガイドパッド４の夫々の外周面４ａに複数の円弧面７を形成してもよい。   Further, in the drill heads 1 and 11 of the above-described embodiment, a plurality of circular arc surfaces 7 are formed on the outer peripheral surface 4a on one guide pad 4 of the plurality of guide pads 4 and 5, but all guides 4 A plurality of arcuate surfaces 7 may be formed on each outer peripheral surface 4 a of the pad 4.

また、ガイドパッド４の外周面４ａに周方向に複数設けた円弧面７，７間には、フラット面８以外に、例えば凹溝を形成することも考えられるが、ガイドパッド４が非常に硬い超硬材で形成されることから、凹溝の加工に比べて、フラット面８の加工の方がはるかに簡単容易となり、従ってガイドパッド４のコストを低減できる。   In addition to the flat surface 8, for example, a concave groove may be formed between the circular arc surfaces 7 and 7 provided in the circumferential direction on the outer peripheral surface 4a of the guide pad 4, but the guide pad 4 is very hard. Since it is formed of a super hard material, the processing of the flat surface 8 is much easier and easier than the processing of the concave groove, and therefore the cost of the guide pad 4 can be reduced.

１，１１ ドリルヘッド
２ ヘッド本体
４ ガイドパッド
４ａ ガイドパッドの外周面
５ ガイドパッド
７ 円弧面
８ フラット面
１０ 切削孔
１０ａ 切削孔の内周面
Ｗ 被削材
ｓ ガイドパッドのフラット面と切削孔の内周面との隙間


1,11 Drill head 2 Head body 4 Guide pad 4a Guide pad outer peripheral surface 5 Guide pad 7 Arc surface 8 Flat surface 10 Cutting hole 10a Inner peripheral surface W of cutting hole Work material s Flat surface of guide pad and cutting hole Clearance with inner surface


Claims (1)

ヘッド本体の外周に複数個のガイドパッドを取り付けたドリルヘッドにおいて、
少なくとも１個のガイドパッドの外周面は、フラット面と、被削材の切削孔の内周面に摺接する複数の円弧面と、を有し、前記フラット面の両側は前記円弧面と接続してなることを特徴とするドリルヘッド。 In a drill head with a plurality of guide pads attached to the outer periphery of the head body,
The outer peripheral surface of at least one guide pad has a flat surface and a plurality of arc surfaces slidingly contacting the inner peripheral surface of the cutting hole of the work material , and both sides of the flat surface are connected to the arc surface. A drill head characterized by
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JP6548051B2 (en) * 2015-07-27 2019-07-24 株式会社タンガロイ Replacement tool for cutting tool and body for cutting tool
CN105171061A (en) * 2015-10-09 2015-12-23 苏州阿诺精密切削技术股份有限公司 Tooth crown drill bit locked through two screws in V-shaped positioning groove
DE102021133961B4 (en) 2021-12-21 2023-07-06 Gühring KG Cutting tool for hydrostatic bearing
JP7454140B1 (en) 2023-04-26 2024-03-22 株式会社タンガロイ Guide pad, body and hole machining tools

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SE347450B (en) * 1969-11-24 1972-08-07 Sandvikens Jernverks Ab
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DE102009013270B3 (en) * 2009-03-15 2010-06-10 Hermann Von Rautenkranz Internationale Tiefbohr Gmbh & Co Kg - Itag Guide rail for receiving developing surface pressure at drilling head, has deep holes formed in work pieces by using drilling head, and wear areas receiving surface pressure and separated from each other
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