JP4707414B2 - Drill head - Google Patents

Drill head Download PDF

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JP4707414B2
JP4707414B2 JP2005060279A JP2005060279A JP4707414B2 JP 4707414 B2 JP4707414 B2 JP 4707414B2 JP 2005060279 A JP2005060279 A JP 2005060279A JP 2005060279 A JP2005060279 A JP 2005060279A JP 4707414 B2 JP4707414 B2 JP 4707414B2
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edge
cutting edge
cutting blade
rake face
outer peripheral
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JP2006239826A (en
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倬司 野村
誠 酒井
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Unitac Inc
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Unitac Inc
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Description

本発明は、主として深穴加工に使用されるドリルヘッドに関するもので、特にヘッド本体の少なくとも中心側と外周側とに切削刃がロー付けされ、外周側切削刃には前切刃と隣接する前すくい面にチップブレーカが設けられているドリルヘッドに関する。   The present invention relates to a drill head mainly used for deep hole machining. In particular, a cutting blade is brazed to at least the center side and the outer peripheral side of the head body, and the outer cutting blade is adjacent to the front cutting edge. The present invention relates to a drill head having a chip breaker provided on a rake face.

図４の(a) は従来の深穴加工用ドリルヘッドの全体を示す側面図、(b) はその正面図、(c) は(a) に示されるドリルヘッドに取り付けられた外周側切削刃を矢印イから見た正面図であり、図５の(a) は図４の(b) の矢印ロで示される部分の拡大図、(b) は(a) の矢印ハで示される部分の拡大斜視図、(c) は横切刃が摩耗した状態を示す(b) と同様な斜視図である。これらの図において、１はヘッド本体で、このヘッド本体１の先端面部には、中心側切削刃２と外周側切削刃１３と中間側切削刃４との３つの切削刃、及び２つのガイドパッド５が夫々ロー付けによって固着されている。 4A is a side view showing the entire conventional deep hole drilling head, FIG. 4B is a front view thereof, and FIG. 4C is an outer peripheral cutting blade attached to the drill head shown in FIG. 5 (a) is an enlarged view of the part indicated by arrow b in FIG. 4 (b), and FIG. 5 (b) is the part indicated by arrow c in (a). An enlarged perspective view, (c) is a perspective view similar to FIG. In these drawings, reference numeral 1 denotes a head main body. On the front end surface portion of the head main body 1, three cutting blades of a central cutting blade 2, an outer peripheral cutting blade 13, and an intermediate cutting blade 4, and two guide pads are provided. Each of 5 is fixed by brazing.

外周側切削刃１３を示す図５の(a) ，(b) において、６は前切刃、７は前切刃６と隣接する前すくい面、８は前逃げ面を示し、前すくい面７にはチップブレーカ１０が形成されている。９は外周側切削刃１３の外側面のドリル回転方向先端側に形成されたマージン部（外周側逃げ面上の、逃げ角の付いていない部分）であり、このマージン部９の先端側は面取りされて、面取り角度αが例えば３０°の面取り部２０を形成し、この面取り部２０と前すくい面７との稜線が横切刃２１を形成している。２２はマージン部９の手前側に形成された横逃げ面である。 5 (a) and 5 (b) showing the outer peripheral cutting edge 13, 6 is a front cutting edge, 7 is a front rake face adjacent to the front cutting edge 6, 8 is a front flank face, and the front rake face 7 is shown. A chip breaker 10 is formed on the substrate. Reference numeral 9 denotes a margin portion (a portion on the outer peripheral side flank with no clearance angle) formed on the front end side in the drill rotation direction on the outer side surface of the outer peripheral side cutting blade 13. The front end side of the margin portion 9 is chamfered. Thus, a chamfered portion 20 having a chamfering angle α of, for example, 30 ° is formed, and a ridge line between the chamfered portion 20 and the front rake surface 7 forms a side cutting edge 21 . Reference numeral 22 denotes a side clearance surface formed on the front side of the margin portion 9.

上記のような構成のドリルヘッドを使用して深穴加工を行う時には、前切刃６と横切刃２１とのコーナー部Ｋで切削されたワークの切削痕がマクロ的にピーク・アンド・バリー形状、即ち鋸歯状となることから、この鋸歯状部分を浚えて凹凸部を無くするように切削するのが横切刃２１であり、その意味で横切刃２１は「浚え刃」と呼ばれることがある。また、ガイドパッド５は、ドリルヘッドをサポートする機能と共に、横切刃２１で切削された切削部分を面潰し（バーニッシング）する機能を有する。 When deep hole machining is performed using the drill head configured as described above, the cutting trace of the workpiece cut at the corner portion K between the front cutting edge 6 and the side cutting edge 21 is macroscopically peak-and-valley. Since it has a shape, that is, a sawtooth shape, it is the horizontal cutting blade 21 that cuts the serrated portion so as to eliminate the uneven portion, and in this sense, the horizontal cutting blade 21 is called a “bare blade”. Sometimes. Further, the guide pad 5 has a function of crushing (burnishing) a cut portion cut by the side cutting blade 21 as well as a function of supporting the drill head.

しかして、横切刃２１は、図５の(b) に示すように前すくい面７と面取り部２０との稜線に沿って形成されるものであるから、この横切刃２１が使用により摩滅して（その摩滅部分をＧで示す）図５の(c) に示すように無くなってしまうと、最早上記のような浚え機能を有しなくなる。この場合、図４の(a) に示すようなヒールクリアランスδ（前切刃６と横切刃２１とのコーナー部Ｋと、ガイドパッド５のパッド面５ａの先端縁Ｅとの間隔）が小さい時は殆ど問題ないのであるが、このヒールクリアランスδが大きくなって、ガイドパッド５のパッド面５ａの先端縁Ｅが横切刃２１に対応する位置から外れ、面取り部２０に対応する位置まで下がるようになると、上記のように横切刃２１が「浚え刃」として機能しなくなる上に、ガイドパッド５による面潰し機能も実質的に作用しなくなる。その結果、工具寿命、即ち外周側切削刃１３の寿命が短くなると共に、ワークの加工精度、面粗度及び真直度が低下するといった問題があった。 Thus, cutting edge 21, since it is intended to be formed along the edge of the rake face 7 and the chamfered portion 20 before, as shown in (b) of FIG. 5, wear the cutting edge 21 by using If it disappears as shown in (c) of FIG. 5 (the worn portion is indicated by G), it will no longer have the above-described barking function. In this case, the heel clearance δ (the distance between the corner portion K between the front cutting edge 6 and the side cutting edge 21 and the leading edge E of the pad surface 5a of the guide pad 5) as shown in FIG. Although there is almost no problem at this time, the heel clearance δ is increased, and the leading edge E of the pad surface 5a of the guide pad 5 is disengaged from the position corresponding to the horizontal cutting edge 21 and lowered to the position corresponding to the chamfered portion 20. Then, as described above, the side cutting blade 21 does not function as a “bare blade”, and the crushing function by the guide pad 5 does not substantially act. As a result, there is a problem that the tool life, that is, the life of the outer peripheral cutting blade 13 is shortened, and the machining accuracy, surface roughness and straightness of the workpiece are lowered.

本発明は、上記のような課題に鑑み、工具寿命を延ばし、ワークの加工精度、面粗度及び真直度を向上することができるドリルヘッドを提供することを目的とする。   In view of the above problems, an object of the present invention is to provide a drill head that can extend the tool life and improve the machining accuracy, surface roughness, and straightness of a workpiece.

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１先端面部の少なくとも中心側と外周側とに切削刃２，３が、またヘッド本体１先端面外周部にガイドパッド５が夫々ロー付けされ、外周側切削刃３には前切刃６と隣接する前すくい面７にチップブレーカ１０が設けられると共に、外周側切削刃３の外側面にはドリル回転方向先端側にマージン部９が設けられてなるドリルヘッドにおいて、外周側切削刃３における前記マージン部９のドリル回転方向先端側には、横すくい面１１が形成されると共に、該横すくい面１１は、前すくい面７と面一に形成される部分とドリル回転方向に前すくい面７より高段状に形成される部分とからなり、マージン部９の先端縁に沿って横切刃１２が形成され、この横切刃１２は、前切刃６とのコーナー部Ｋを始点として、この始点Ｋからマージン部９先端縁の全長に亘って又はその所要長さまで延びるように形成されていることを特徴とする。 Means for solving the above problems will be described with reference numerals in the embodiments described later. The invention according to claim 1 is directed to cutting blades 2 at least on the center side and on the outer peripheral side of the front end surface portion of the head body 1. 3, and a guide pad 5 is brazed to the outer peripheral portion of the front end surface of the head main body 1, and the outer side cutting blade 3 is provided with a chip breaker 10 on a front rake surface 7 adjacent to the front cutting edge 6, In the drill head in which a margin portion 9 is provided on the outer surface of the cutting blade 3 on the tip side in the drill rotation direction, a side rake surface 11 is provided on the tip end side in the drill rotation direction of the margin portion 9 in the outer peripheral side cutting blade 3. The lateral rake face 11 is formed of a portion formed flush with the front rake face 7 and a portion formed higher than the front rake face 7 in the drill rotation direction . Along the leading edge A cutting edge 12 is formed, and the horizontal cutting edge 12 is formed so as to extend from the corner K with the front cutting edge 6 to the entire length of the leading edge of the margin 9 or to the required length from the starting point K. It is characterized by being.

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に係る発明によれば、横切刃１２が、使用によって、例えばコーナー部Ｋからガイドパッド５の先端縁Ｅと周方向に対応する位置Ｐ程度まで摩滅しても、その摩滅部Ｇを過ぎたところに新しいシャープエッジが現れて、そのまま横切刃１２が形成されるから、この新しく現れたシャープエッジの横切刃１２が、ワークの切削痕であるピーク・アンド・バリー部、即ち微小凹凸部を浚えることができる。これによって、工具寿命を延ばすことができるようになると共に、ワークの加工精度、面粗度及び真直度を向上させることができる。   The effect of the invention by the above solution will be described with reference numerals of the embodiments described later. According to the invention according to claim 1, the side cutting blade 12 is used, for example, from the corner portion K to the guide pad 5 by use. Even if the tip edge E is worn down to the position P corresponding to the circumferential direction, a new sharp edge appears after the worn portion G, and the horizontal cutting edge 12 is formed as it is. The sharp-edged horizontal cutting edge 12 can grasp a peak-and-bury part, that is, a minute uneven part, which is a cutting trace of a workpiece. As a result, the tool life can be extended, and the machining accuracy, surface roughness and straightness of the workpiece can be improved.

また、このような横切刃１２を形成したことによって、ヒールクリアランスδ（前切刃６と横切刃１２とのコーナー部Ｋと、ガイドパッド５におけるパッド面５ａの先端縁Ｅとの間隔）が大きい場合でも、横切刃１２を「浚え刃」として機能させることができると共に、ガイドパッド５による面潰し機能も十分作用させることができる。 Further, by forming such a horizontal cutting edge 12, the heel clearance δ (the distance between the corner portion K between the front cutting edge 6 and the horizontal cutting edge 12 and the leading edge E of the pad surface 5a in the guide pad 5). Even when is large, the side cutting blade 12 can function as a “bare blade”, and the surface crushing function by the guide pad 5 can sufficiently act.

以下に本発明の好適実施形態について図１〜図３を参照して説明する。なお、図１及び図２は、図３に係る本発明の前提条件となる構造を説明する図である。図１の(a) は本発明の前提となるドリルヘッドの先端部側を示す側面図、(b) はその正面図、(c) は(a) に示されるドリルヘッドに取り付けられた外周側切削刃３を矢印Ｘから見た正面図であり、図２の(a) は図１の(b) の矢印Ｙで示される部分の拡大図、(b) は(a) の矢印Ｚで示される部分の拡大斜視図、(c) は横切刃１２が摩耗した状態を示したもので、(b) と同様な斜視図である。 A preferred embodiment of the present invention will be described below with reference to FIGS. FIGS. 1 and 2 are diagrams for explaining a structure which is a precondition of the present invention according to FIG. FIG. 1 (a) is a side view showing the tip side of the drill head as a premise of the present invention, (b) is a front view thereof, and (c) is an outer peripheral side attached to the drill head shown in (a). FIGS. 2A and 2B are front views of the cutting blade 3 as viewed from an arrow X. FIG. 2A is an enlarged view of a portion indicated by an arrow Y in FIG. 1B, and FIG. 2B is an arrow Z in FIG. (C) is a perspective view similar to (b), showing a state in which the side cutting edge 12 is worn.

図１の(a) 〜(c) に示すように、ヘッド本体１の先端面部には、中心側切削刃２と外周側切削刃３と中間側切削刃４との３つの切削刃、及び２つのガイドパッド５が夫々ロー付けによって固着されている。外周側切削刃３は、図２の(a) 及び(b) から分かるように、図４及び図５に示される従来の外周側切削刃１３と略々同様であって、前切刃６と隣接する前すくい面７にチップブレーカ１０が設けられ、また外周側切削刃３の外側面にはドリル回転方向先端側にマージン部９が設けられている。また同様に、８は前逃げ面を示し、２２はマージン部９の手前側に形成された横逃げ面を示す。   As shown to (a)-(c) of FIG. 1, in the front end surface part of the head main body 1, three cutting blades of the center side cutting blade 2, the outer peripheral side cutting blade 3, and the intermediate side cutting blade 4, and 2 Two guide pads 5 are fixed by brazing. As can be seen from FIGS. 2A and 2B, the outer peripheral cutting blade 3 is substantially the same as the conventional outer peripheral cutting blade 13 shown in FIGS. A chip breaker 10 is provided on the adjacent front rake surface 7, and a margin portion 9 is provided on the outer surface of the outer peripheral cutting blade 3 on the tip side in the drill rotation direction. Similarly, 8 indicates a front clearance surface, and 22 indicates a lateral clearance surface formed on the front side of the margin portion 9.

しかして、この外周側切削刃３において、従来の外周側切削刃１３と異なるところは、図２の(a) 及び(b) に示すように、マージン部９のドリル回転方向先端側に、面取り部を形成することなく、横すくい面１１が形成されると共に、マージン部９の先端縁に沿ってシャープエッジ状の横切刃１２が形成されている点であって、この横切刃１２は、横切刃１２と前切刃６とのコーナー部Ｋを始点とし、この始点Ｋから、ガイドパッド５の先端縁Ｅと周方向に対応する位置Ｐを越えて、マージン部９の下端位置まで延びるように（図１の(a) 及び(b) 参照）形成されている。   Therefore, the outer peripheral cutting blade 3 is different from the conventional outer peripheral cutting blade 13 in that the chamfering is provided on the front end side in the drill rotation direction of the margin portion 9 as shown in FIGS. 2 (a) and 2 (b). A side rake face 11 is formed without forming a portion, and a sharp edge-shaped horizontal cutting blade 12 is formed along the leading edge of the margin portion 9. The corner K between the side cutting edge 12 and the front cutting edge 6 is the starting point, and from the starting point K to the tip edge E of the guide pad 5 and the position P corresponding to the circumferential direction, to the lower end position of the margin portion 9. It is formed to extend (see (a) and (b) in FIG. 1).

また図２の(a) 及び(b) から分かるように、本発明の前提とする横すくい面１１は、前すくい面７と面一に形成されており、そしてこの横すくい面１１には、前すくい面７にチップブレーカ１０が形成されているのと同様に、横チップブレーカ１４が形成されている。 As can be seen from FIGS. 2 (a) and 2 (b) , the side rake face 11 as a premise of the present invention is formed flush with the front rake face 7, and the side rake face 11 includes: A horizontal chip breaker 14 is formed in the same manner as the chip breaker 10 is formed on the front rake face 7.

上記のようにマージン部９のドリル回転方向先端側に、面取り部を形成することなく、横すくい面１１を形成すると共に、マージン部９の先端縁に沿って横切刃１２を形成し、この横切刃１２を、前切刃６とのコーナー部Ｋからマージン部９先端縁の全長に亘って又はその所要長さまで延びるように形成する構成としたことによって、横切刃１２が、使用によって、例えば図２の(c) に示すようにコーナー部Ｋからガイドパッド５の先端縁Ｅと周方向に対応する位置Ｐ程度迄摩滅して、その摩滅部分Ｇでの浚え機能が無くなっても、その摩滅部分Ｇを過ぎたところに新しいシャープエッジが現れて、横切刃１２を形成するから、この新しく現れたシャープエッジの横切刃１２が、ワークの切削痕であるピーク・アンド・バリー部を浚える「浚え刃」として機能することができる。これによって、工具寿命、即ち外周側切削刃１３自体の寿命を延ばすことができるようになる共に、ワークの加工精度、面粗度及び真直度を向上させることができる。   As described above, the side rake face 11 is formed on the front end side in the drill rotation direction of the margin portion 9 without forming the chamfered portion, and the side cutting edge 12 is formed along the front end edge of the margin portion 9. The horizontal cutting edge 12 is formed so as to extend from the corner portion K to the front cutting edge 6 over the entire length of the leading edge of the margin portion 9 or to the required length thereof. For example, as shown in FIG. 2 (c), even if the wear from the corner portion K to the position P corresponding to the tip edge E of the guide pad 5 and the circumferential direction is eliminated, the wear function at the worn portion G disappears. Since the new sharp edge appears after the worn portion G and forms the side cutting edge 12, the new sharp edge side cutting edge 12 is the peak and valley which is the cutting trace of the workpiece. Praise the club Can function as a "blade". As a result, the tool life, that is, the life of the outer peripheral cutting blade 13 itself can be extended, and the workpiece machining accuracy, surface roughness and straightness can be improved.

また、このような横切刃１２を形成したことによって、図１の(a) ，(c) に示すようなヒールクリアランスδ（前切刃６と横切刃１２とのコーナー部Ｋと、ガイドパッド５のパッド面５ａの先端縁Ｅとの間隔）が大きい場合でも、横切刃１２を「浚え刃」として機能させることができると共に、ガイドパッド５による面潰し機能も十分に作用させることができる。 Further, by forming such a horizontal cutting edge 12, a heel clearance δ (a corner portion K between the front cutting edge 6 and the horizontal cutting edge 12 , and a guide as shown in FIGS. 1A and 1C). Even when the distance between the pad surface 5a and the leading edge E of the pad 5 is large), the side cutting blade 12 can function as a “bare blade” and the surface crushing function by the guide pad 5 can be sufficiently applied. Can do.

尚、横切刃１２を、横切刃１２と前切刃６とのコーナー部Ｋからマージン部９先端縁の全長に亘って形成している（マージン部９の先端側にはマージン部９の全長に亘るように横すくい面１１が形成されている）が、横切刃１２は、マージン部９先端縁の全長に亘って形成せず、コーナー部Ｋから、ガイドパッド５の先端縁Ｅと周方向に対応する位置Ｐを越えてマージン部９先端縁の中間所要部まで延びるように形成してもよい。その場合、横切刃１２を形成しない領域では、マージン部９の先端側に面取り部を形成してもよい。この実施形態のように、横切刃１２を、横切刃１２と前切刃６とのコーナー部Ｋからマージン部９先端縁の全長に亘って形成すれば、ドリルヘッドの製作加工が容易となる。   The horizontal cutting edge 12 is formed from the corner portion K between the horizontal cutting edge 12 and the front cutting edge 6 to the entire length of the leading edge of the margin portion 9 (the margin portion 9 has a margin portion 9 on the leading end side). However, the side cutting edge 12 is not formed over the entire length of the leading edge of the margin portion 9, but from the corner portion K to the leading edge E of the guide pad 5. You may form so that it may extend to the intermediate required part of the margin part 9 front-end | tip edge beyond the position P corresponding to the circumferential direction. In that case, a chamfered portion may be formed on the leading end side of the margin portion 9 in a region where the horizontal cutting edge 12 is not formed. If the horizontal cutting edge 12 is formed from the corner K between the horizontal cutting edge 12 and the front cutting edge 6 to the entire length of the leading edge of the margin 9 as in this embodiment, the drill head can be manufactured easily. Become.

図１〜図２に示すように、本発明の前提とするこの実施形態では、横すくい面１１を、前すくい面７と面一に形成することによって、ドリルヘッドの製作加工が容易となる。 As shown in FIGS. 1 to 2, in this embodiment as a premise of the present invention , the drilling of the drill head is facilitated by forming the side rake face 11 flush with the front rake face 7.

図３の(a) は本発明に係る実施形態を示すもので、この実施形態による外周側切削刃３を示す図２の(a) と同様な図面、(b) は(a) の矢印Ｖで示される部分の拡大斜視図、(c) は横切刃１２が摩耗した状態を示す(b) と同様な斜視図である。ここに示す外周側切削刃３は、図２に示す外周側切削刃３と殆ど同じであるが、本発明にあっては横すくい面１１と前すくい面７との間に段差がある点で、図２の外周側切削刃３と異なる。即ち、横切刃１２がマージン部９のドリル回転方向先端縁に沿ってその全長に亘って形成されている点では、図２の外周側切削刃３と同じであるが、横すくい面１１が前方から見て前すくい面７より僅かに高段状に形成されている。 FIG. 3 (a) shows an embodiment according to the present invention, and is a drawing similar to FIG. 2 (a) showing an outer peripheral cutting blade 3 according to this embodiment , and FIG. 3 (b) is an arrow V in FIG. (C) is a perspective view similar to (b) showing a state in which the side cutting blade 12 is worn. The outer peripheral cutting blade 3 shown here is almost the same as the outer peripheral cutting blade 3 shown in FIG. 2, but in the present invention, there is a step between the side rake face 11 and the front rake face 7. 2 is different from the outer peripheral cutting blade 3 in FIG. That is, the side cutting edge 12 is the same as the outer peripheral cutting edge 3 in FIG. 2 in that the side cutting edge 12 is formed over the entire length of the margin portion 9 along the tip end in the drill rotation direction. It is formed in a slightly higher step shape than the front rake face 7 when viewed from the front.

この外周側切削刃３の作用については図２の場合と同様で、横切刃１２が、例えば図３の(c) に示すようにコーナー部Ｋからガイドパッド５の先端縁Ｅと周方向に対応する位置Ｐ程度迄摩滅しても、その摩滅部分Ｇを過ぎたところの高段状の横すくい面１１に新しいシャープエッジが現れて、横切刃１２を形成するから、この新しく現れたシャープエッジの横切刃１２が、ワークの切削痕跡であるピーク・アンド・バリー部を浚えることができる。 The operation of the outer peripheral cutting blade 3 is the same as in the case of FIG. 2, and the side cutting blade 12 extends in the circumferential direction from the corner K to the tip edge E of the guide pad 5 as shown in FIG. Even if it is worn down to about the corresponding position P, a new sharp edge appears on the stepped side rake face 11 past the worn portion G to form a horizontal cutting edge 12. The edge side cutting edge 12 can grasp the peak and valley part which is the cutting trace of the workpiece.

(a) は本発明の前提となるドリルヘッドの先端部側を示す側面図、(b) はその正面図、(c) は(a) に示されるドリルヘッドに取り付けられた外周側切削刃３を矢印Ｘから見た正面図である。(a) is a side view showing the tip side of a drill head which is a premise of the present invention, (b) is a front view thereof, and (c) is an outer peripheral side cutting blade 3 attached to the drill head shown in (a). It is the front view which looked at from arrow X. (a) は図１の(b) の矢印Ｙで示される部分の拡大図、(b) は(a) の矢印Ｚで示される部分の拡大斜視図、(c) は横切刃１２が摩耗した状態を示したもので、(b) と同様な斜視図である。1A is an enlarged view of a portion indicated by an arrow Y in FIG. 1B, FIG. 1B is an enlarged perspective view of a portion indicated by an arrow Z in FIG. 1A, and FIG. FIG. 5 is a perspective view similar to FIG. (a) は本発明に係る実施形態による外周側切削刃３を示す図２の(a) と同様な図面、(b) は(a) の矢印Ｖで示される部分の拡大斜視図、(c) は横切刃１２が摩耗した状態を示す(b) と同様な斜視図である。(a) is a drawing similar to (a) of FIG. 2 showing an outer peripheral cutting blade 3 according to an embodiment of the present invention , (b) is an enlarged perspective view of a portion indicated by an arrow V in (a), (c) ) Is a perspective view similar to (b) showing a state in which the side cutting edge 12 is worn. (a) は従来の深穴加工用ドリルヘッドの全体を示す側面図、(b) はその正面図、(c) は(a) に示されるドリルヘッドに取り付けられた外周側切削刃を矢印イから見た正面図である。(a) is a side view showing the entire conventional drilling head for deep hole drilling, (b) is a front view thereof, (c) is an arrow icon showing an outer peripheral cutting blade attached to the drill head shown in (a). It is the front view seen from. (a) は図１の(b) の矢印ロで示される部分の拡大図、(b) は(a) の矢印ハで示される部分の拡大斜視図、(c) は横切刃が摩耗した状態を示す(b) と同様な斜視図である。(a) is an enlarged view of the portion indicated by the arrow b in FIG. 1 (b), (b) is an enlarged perspective view of the portion indicated by the arrow c in (a), and (c) is a wear of the horizontal cutting edge. It is a perspective view similar to (b) showing the state.

１ ヘッド本体
２ 中心側切削刃
３ 外周側切削刃
４ 中間側切削刃
５ ガイドパッド
５ａ パッド面
Ｅ パッド面の先端縁
６ 前切刃
７ 前すくい面
９ マージン部
１０ チップブレーカ
１１ 横すくい面
１２ 横切刃
Ｋ 前切刃と横切刃とのコーナー部 DESCRIPTION OF SYMBOLS 1 Head main body 2 Center side cutting blade 3 Outer peripheral side cutting blade 4 Middle side cutting blade 5 Guide pad 5a Pad surface E Pad edge E Front edge 6 Front cutting edge 7 Front rake face 9 Margin part 10 Chip breaker 11 Horizontal rake face 12 Horizontal Cutting edge K Corner part of front cutting edge and side cutting edge

Claims (1)

ヘッド本体先端面部の少なくとも中心側と外周側とに切削刃が、またヘッド本体先端面外周部にガイドパッドが夫々ロー付けされ、外周側切削刃には前切刃と隣接する前すくい面にチップブレーカが設けられると共に、外周側切削刃の外側面にはドリル回転方向先端側にマージン部が設けられてなるドリルヘッドにおいて、
外周側切削刃における前記マージン部のドリル回転方向先端側には横すくい面が形成されると共に、該横すくい面は、前すくい面と面一に形成される部分とドリル回転方向に前すくい面より高段状に形成される部分とからなり、マージン部の先端縁に沿って横切刃が形成され、この横切刃は、前切刃とのコーナー部を始点として、この始点から前記ガイドパッドの先端縁と周方向に対応する位置を越えてマージン部先端縁の全長に亘って又はその所要長さまで延びるように形成ていることを特徴とするドリルヘッド。 A cutting blade is brazed to at least the center side and the outer periphery of the head body tip surface, and a guide pad is brazed to the outer periphery of the head body tip surface. The outer cutting blade has a tip on the front rake surface adjacent to the front cutting edge. In the drill head in which a breaker is provided, and a margin part is provided on the outer surface of the outer peripheral side cutting blade on the tip side in the drill rotation direction
A side rake face is formed on the front end side in the drill rotation direction of the margin portion of the outer peripheral cutting blade, and the side rake face is a portion formed flush with the front rake face and a front rake face in the drill rotation direction. The horizontal cutting edge is formed along the leading edge of the margin portion, and the horizontal cutting edge starts from the corner portion with the front cutting edge and starts the guide from the starting point. A drill head characterized in that the drill head is formed so as to extend over the entire length of the margin portion tip edge beyond a position corresponding to the tip edge of the pad in the circumferential direction or to a required length thereof.
JP2005060279A 2005-03-04 2005-03-04 Drill head Expired - Fee Related JP4707414B2 (en)

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JP4961246B2 (en) * 2007-04-02 2012-06-27 ユニタック株式会社 Deep hole cutting equipment
JP2010000581A (en) * 2008-06-23 2010-01-07 Yunitakku Kk Deep hole boring drill head
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CN108356329A (en) * 2018-02-07 2018-08-03 成都工具研究所有限公司 A kind of side set BTA drill bits and its manufacturing method based on hot investment casting structure of the cutter body
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