JP5803707B2 - Drilling tool - Google Patents

Drilling tool Download PDF

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JP5803707B2
JP5803707B2 JP2012021130A JP2012021130A JP5803707B2 JP 5803707 B2 JP5803707 B2 JP 5803707B2 JP 2012021130 A JP2012021130 A JP 2012021130A JP 2012021130 A JP2012021130 A JP 2012021130A JP 5803707 B2 JP5803707 B2 JP 5803707B2
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hole
cartridge
tool body
tool
peripheral side
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JP2013158856A (en
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滝口 正治
正治 滝口
矢野 喜久幸
喜久幸 矢野
壮史 鷲見
壮史 鷲見
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Mitsubishi Materials Corp
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Description

本発明は、被削材に形成された下穴を所定の内径の加工穴に加工するための穴加工工具に関するものである。   The present invention relates to a hole machining tool for machining a prepared hole formed in a work material into a machining hole having a predetermined inner diameter.

このような穴加工工具として、特許文献1には、軸線回りに回転される略円柱状の工具本体の外周面に、被削材に形成された加工穴の内壁面と摺接するガイドパッドが設けられるとともに、工具本体の先端部外周に形成された取付座には切刃を有するインサートが装着され、取付座の径方向内周側にはインサートの位置を調整する調整クサビが挿入されたものが提案されている。この穴加工工具では、調整クサビによってインサートの位置を調整することによりガイドパッドに対する切刃の振れだし量を調整し、下穴を切刃によって切削した加工穴の内壁面にガイドパッドを確実に摺接させて工具本体の振れを抑制するようにしている。   As such a drilling tool, in Patent Document 1, a guide pad is provided on the outer peripheral surface of a substantially cylindrical tool body that is rotated around an axis so as to be in sliding contact with the inner wall surface of a drilled hole formed in the work material. In addition, an insert having a cutting blade is mounted on the mounting seat formed on the outer periphery of the tip end portion of the tool body, and an adjustment wedge for adjusting the position of the insert is inserted on the radially inner peripheral side of the mounting seat. Proposed. In this drilling tool, the amount of runout of the cutting blade relative to the guide pad is adjusted by adjusting the position of the insert with an adjustment wedge, and the guide pad is securely slid onto the inner wall surface of the drilled hole cut by the cutting blade. It is made to contact and the deflection of a tool main part is controlled.

特開2006−150535号公報JP 2006-150535 A

しかしながら、このようなガイドパッドを用いて工具本体の振れを抑制する穴加工工具では、特許文献1にも記載されているように切刃が軸線回りの回転軌跡においてガイドパッドよりも外側に突き出すようにインサートが位置調整されて取り付けられていて、回転軌跡における切刃径とガイドパッドの外径との間にクリアランスがあり、工具本体が正確に軸線回りに回転しているとガイドパッドは理論的には切刃によって加工された加工穴には摺接しないことになる。実際には、切削時に切刃に作用する背分力によって工具本体が回転軸線に対して極僅かに撓むことによりガイドパッドが加工穴内壁面に摺接するが、これは工具本体に振れが生じている状態であり、従って振れに伴うビビリ振動などを完全に防止することは困難となる。   However, in such a drilling tool that uses such a guide pad to suppress the deflection of the tool body, as described in Patent Document 1, the cutting blade protrudes outward from the guide pad in the rotation locus around the axis. If the insert is positioned and mounted, there is a clearance between the cutting edge diameter and the guide pad outer diameter in the rotation path, and the guide pad is theoretically rotated if the tool body rotates precisely around the axis. In this case, it does not slide into the processed hole processed by the cutting blade. Actually, the back of the cutting force acting on the cutting edge during cutting causes the tool body to bend slightly with respect to the rotation axis, causing the guide pad to slidably contact the inner wall surface of the processing hole. Therefore, it is difficult to completely prevent chatter vibrations due to vibration.

また、振れを極力抑制してビビリ振動を防止するために最適な上記クリアランスの設定は、被削材や切削条件等によって変化するのに対し、工具本体の軸線からのガイドパッドの外径は一定であるため、特許文献1の穴加工工具では、調整クサビによるインサートの位置調整だけでこのような最適なクリアランスを設定しなければならない。このため、クリアランスの設定が難しく、また最適なクリアランスが調整クサビによるインサートの位置調整範囲を越えている場合には、ガイドパッドを外径の異なるものに交換するなどしなければならない。   In addition, the optimum clearance setting for suppressing vibration and preventing chatter vibration varies depending on the work material and cutting conditions, while the guide pad outer diameter from the tool body axis is constant. Therefore, in the hole drilling tool of Patent Document 1, such an optimal clearance must be set only by adjusting the position of the insert with the adjustment wedge. For this reason, it is difficult to set the clearance, and when the optimum clearance exceeds the position adjustment range of the insert by the adjustment wedge, the guide pad must be replaced with one having a different outer diameter.

本発明は、このような背景の下になされたもので、ガイドパッドを用いることなく工具本体の振れを抑制してビビリ振動などを防止し、より高精度の穴加工を行うことが可能な穴加工工具を提供することを目的としている。   The present invention is made under such a background, and without using a guide pad, the vibration of the tool main body is suppressed to prevent chatter vibration and the like, and a hole capable of performing highly accurate hole drilling. The purpose is to provide machining tools.

上記課題を解決して、このような目的を達成するために、本発明は、軸線回りに回転される上記軸線を中心とした円柱状の工具本体の先端部外周に切刃が突設されるとともに、上記工具本体の先端部の上記軸線を間にして上記切刃とは反対側に形成された取付凹部には、上記切刃よりも上記軸線方向後端側に、上記工具本体の外周側に球面状の凸曲部を有する押圧部材が該工具本体の外周側に付勢されて取り付けられ、上記押圧部材は球体であって、上記取付凹部において転動可能に取り付けられているとともに、上記取付凹部には潤滑油剤が供給可能とされていることを特徴とする。 In order to solve the above problems and achieve such an object, according to the present invention, a cutting blade protrudes from the outer periphery of the tip of a cylindrical tool body around the axis rotated around the axis. In addition, in the mounting recess formed on the opposite side of the cutting edge with the axis of the tip of the tool body in between, the outer peripheral side of the tool body is closer to the rear end side in the axial direction than the cutting edge. A pressing member having a spherical convex curved portion is attached to the outer peripheral side of the tool body by being urged, and the pressing member is a sphere, and is attached so as to be able to roll in the mounting recess. A lubricant oil can be supplied to the mounting recess .

このように構成された穴加工工具においては、穴加工を行っていない状態での押圧部材の工具本体外周側に位置する球面状の凸曲部の突端の工具本体軸線回りの外径を切刃の外径よりも大きくしておくことにより、穴加工の際に切刃が下穴の内壁面を切削して所定の内径に形成された加工穴に押圧部材が挿入されると、軸線を間に切刃と反対側の取付凹部に取り付けられて工具本体の外周側に付勢された押圧部材が、その付勢力に抗して工具本体内周側に押し込まれ、凸曲部が加工穴の内壁面に押圧されて摺接しつつ穴加工が行われる。   In the hole drilling tool configured in this way, the outer diameter around the tool body axis of the tip of the spherical convex bend located on the outer peripheral side of the tool body of the pressing member when not drilling is determined. When the hole is drilled, the cutting edge cuts the inner wall surface of the pilot hole and the pressing member is inserted into the drilled hole with the specified inner diameter. The pressing member attached to the mounting recess on the side opposite to the cutting edge and biased toward the outer periphery of the tool body is pushed into the inner periphery of the tool body against the biasing force, and the convex curved portion is Hole processing is performed while being slidably pressed against the inner wall surface.

従って、こうして押圧部材が工具本体内周側に押し込まれた状態での凸曲部の突端の外径は、加工穴の内径すなわち押圧部材と反対側の切刃の外径と等しくなり、これら押圧部材の凸曲部と切刃とで支持するようにして、撓みによる振れを生じることなく工具本体を正確に軸線回りに回転させることができ、ビビリ振動の発生を防止して高精度の穴加工を行うことが可能となる。   Therefore, the outer diameter of the protruding end of the convex curved portion when the pressing member is pushed into the inner peripheral side of the tool body in this way becomes equal to the inner diameter of the machining hole, that is, the outer diameter of the cutting blade on the opposite side of the pressing member. The tool body can be rotated around the axis accurately without causing deflection due to bending by supporting with the convex part of the member and the cutting edge, preventing chatter vibration and high-precision drilling Can be performed.

また、上述のように加工穴に挿入されることによって押圧部材が付勢力に抗して工具本体内周側に押し込まれることにより、その凸曲部が加工穴内壁面に摺接するので、クリアランスの設定を要することがなく、さらに穴加工を行っていない状態での凸曲部の突端の外径と切刃の外径との差を比較的大きくしたり、付勢力を適正に設定したりしておくことで、種々の被削材や切削条件等に対応して確実に凸曲部を加工穴内壁面に摺接させることができる。   In addition, as described above, when the pressing member is pushed into the inner peripheral side of the tool body against the urging force by being inserted into the machining hole, the convex curved portion comes into sliding contact with the inner wall surface of the machining hole, so that the clearance is set. The difference between the outer diameter of the tip of the convex curved part and the outer diameter of the cutting blade when not drilling is made relatively large, or the biasing force is set appropriately. Thus, the convex curved portion can be surely brought into sliding contact with the inner wall surface of the machining hole in accordance with various work materials and cutting conditions.

ここで、上記押圧部材が、工具本体外周側の凸曲部だけが球面状とされて、工具本体内周側は例えば円柱状とされたピン形のものであると、加工穴内壁面との摺接によって凸曲部の突端だけが摩耗してしまうおそれがあるので、本発明では、押圧部材を球体として、上記取付凹部において転動可能に取り付けるようにして、特定の部分が摩耗するのを避けている。この場合には、転動している球体の工具本体外周側に向けられている部分が凸曲部となる。 Here, the pressing member is, only the convex curved portion of the tool body outer peripheral side is a spherical shape, when the inner circumference side the tool body is of the pin type which is for example cylindrical, sliding between the machined hole in the wall Since there is a possibility that only the protruding end of the convex curved portion may be worn by contact, in the present invention, the pressing member is used as a sphere and is mounted so as to be able to roll in the mounting concave portion, thereby avoiding wear of a specific portion. ing. In this case, the portion of the rolling sphere directed toward the outer peripheral side of the tool body is a convex curved portion.

また、本発明では、こうして球体の押圧部材を転動可能に取付凹部に取り付けるのに併せて、この取付凹部に潤滑油剤を供給可能としており、押圧部材の転動に伴って供給された潤滑油剤が凸曲部と加工穴内壁面との摺接部分に送られるので、押圧部材の摩耗を一層抑制することができる。この場合の潤滑油剤としては、切刃による下穴の切削の際に供給される切削油剤(クーラント)を流用するのが効率的である。 Further, in the present invention, in addition to attaching the spherical pressing member to the mounting recess so as to be able to roll, the lubricant can be supplied to the mounting recess, and the lubricant is supplied along with the rolling of the pressing member. Since the lubricant is sent to the sliding contact portion between the convex portion and the inner wall surface of the processed hole, the wear of the pressing member can be further suppressed. As the lubricating oil in this case, it is efficient to divert the cutting oil (coolant) supplied when the pilot hole is cut by the cutting blade.

さらに、上記押圧部材が例えば圧縮コイルバネのような弾性部材によって付勢されている場合には、上記工具本体には、穴加工が行われていない状態での圧縮コイルバネの圧縮量を調整するなどして、上記弾性部材による付勢力を調整する付勢力調整機構を備えることにより、一層広範囲の被削材や切削条件等に対応して押圧部材を確実かつ適当な押圧力で加工穴内壁面に摺接させることができ、工具本体の振れによるビビリ振動等を防止することが可能となる。   Furthermore, when the pressing member is biased by an elastic member such as a compression coil spring, the amount of compression of the compression coil spring when the hole is not drilled is adjusted in the tool body. By providing an urging force adjusting mechanism that adjusts the urging force by the elastic member, the pressing member can be slidably contacted with the inner wall surface of the machining hole with an appropriate pressing force in response to a wider range of work materials and cutting conditions. It is possible to prevent chatter vibrations and the like due to the deflection of the tool body.

以上説明したように、本発明によれば、種々の被削材や切削条件等に対しても、工具本体の振れによるビビリ振動等を防いで工具本体を正確にその軸線回りに回転させ、高精度の穴加工を行うことが可能となる。   As described above, according to the present invention, the tool body can be accurately rotated around its axis to prevent chatter vibrations caused by the vibration of the tool body even for various work materials and cutting conditions. Accurate drilling can be performed.

本発明の一実施形態を示す側面図である。It is a side view which shows one Embodiment of this invention. 図1に示す実施形態の拡大正面図である。It is an enlarged front view of embodiment shown in FIG. 図1に示す実施形態の取付凹部周辺の拡大平面図である。FIG. 2 is an enlarged plan view around the mounting recess of the embodiment shown in FIG. 1. 図1に示す実施形態の切刃が形成されるインサートが取り付けられたカートリッジの(a)平面図、(b)正面図、(c)側面図、(d)サライ刃付きインサートが取り付けられたカートリッジの平面図である。(A) Top view, (b) Front view, (c) Side view, (d) Cartridge to which insert with salai blade is attached FIG.

図1ないし図4は本発明の一実施形態を示すものである。本実施形態において工具本体1は、鋼材等の金属材料により軸線Oを中心とした多段の円柱状に一体形成され、その後端部(図1において右側部分)は、シャンク部2Aおよび自動工具交換装置のアームに把持される把持部2Bが形成された取付部2とされるとともに、先端部(図1において左側部分)は、把持部2Bから先端側に向けて一旦小径円柱状の首部3Aとされた後、この首部3Aよりも大径の円柱状のヘッド部3Bとされ、さらにこのヘッド部3Bの先端には首部3Aよりも小径の円板状のパイロット部3Cが形成された切刃部3とされている。   1 to 4 show an embodiment of the present invention. In the present embodiment, the tool body 1 is integrally formed of a metal material such as a steel material in a multi-stage columnar shape centering on the axis O, and the rear end portion (the right side portion in FIG. 1) has a shank portion 2A and an automatic tool changer. The mounting portion 2 is formed with a grip portion 2B to be gripped by the arm, and the distal end portion (left side portion in FIG. 1) is once a small-diameter columnar neck portion 3A from the grip portion 2B toward the distal end side. After that, a cylindrical head portion 3B having a diameter larger than that of the neck portion 3A is formed, and a cutting edge portion 3 in which a disc-shaped pilot portion 3C having a diameter smaller than that of the neck portion 3A is formed at the tip of the head portion 3B. It is said that.

このような穴加工工具は、上記取付部2が工作機械の主軸に取り付けられて軸線O回りに工具回転方向Tに回転されつつ該軸線O方向先端側に送り出されて、被削材に形成された下穴に切刃部3が挿入され、この切刃部3におけるヘッド部3Bの先端部外周に突設された後述する切刃により、下穴を所定の内径の加工穴に仕上げ加工してゆく。なお、工具本体1内にはシャンク部2Aからヘッド部3Bの後端部にまで軸線Oに沿って切削油剤の供給穴4が形成されており、切刃による仕上げ加工の際にはこの供給穴4から分岐した分岐穴4Aを経て切削油剤が切刃に向けて噴出させられる。   Such a hole drilling tool is formed on a work material by being attached to the main shaft of the machine tool and being sent around the axis O in the tool rotation direction T while being sent to the front end side in the axis O direction. The cutting edge portion 3 is inserted into the prepared hole, and the prepared hole is finished into a processing hole having a predetermined inner diameter by a cutting blade, which will be described later, projecting from the outer periphery of the tip of the head portion 3B. go. A cutting oil supply hole 4 is formed in the tool body 1 along the axis O from the shank portion 2A to the rear end portion of the head portion 3B, and this supply hole is used when finishing with a cutting blade. The cutting fluid is ejected toward the cutting blade through the branch hole 4A branched from the nozzle 4.

ヘッド部3Bの先端部外周には凹溝状のチップポケット5が周方向に間隔をあけて複数(本実施形態では周方向に等間隔に5つ)形成されて、上記分岐穴4Aはこれらのチップポケット5に開口させられるとともに、チップポケット5の工具回転方向T後方側には、軸線Oに直交する断面がL字状をなすやはり凹溝状のカートリッジ取付座6がそれぞれ形成されている。なお、図1に示すように、チップポケット5はヘッド部3Bの先端面から後端側に向けてヘッド部3Bの中央部辺りで凹曲面状をなして外周側に切れ上がっているのに対し、カートリッジ取付座6はチップポケット5の切れ上がり部分から断面「コ」字状をなしてさらに後端側に延び、ヘッド部3Bの後端部よりも僅かに手前にまで形成されている。   A plurality of recessed groove-like chip pockets 5 are formed on the outer periphery of the tip of the head portion 3B at intervals in the circumferential direction (in this embodiment, five at equal intervals in the circumferential direction). While being opened in the chip pocket 5, cartridge mounting seats 6 each having a concave groove shape having a L-shaped cross section perpendicular to the axis O are formed on the back side of the chip pocket 5 in the tool rotation direction T. As shown in FIG. 1, the chip pocket 5 has a concave curved surface around the center of the head portion 3B from the front end surface to the rear end side of the head portion 3B, and is cut off to the outer peripheral side. The cartridge mounting seat 6 extends from the cut-out portion of the chip pocket 5 to the rear end side with a cross-sectional “U” shape, and is formed slightly forward of the rear end portion of the head portion 3B.

図4は、このようなカートリッジ取付座6に取り付けられるカートリッジ7を示すものであり、このカートリッジ7に形成されたインサート取付座7Aにクランプネジ10によって着脱可能に取り付けられるインサート9に上記切刃9Aが形成されている。このカートリッジ7は、工具本体1と同じく鋼材等の金属材料によって断面略台形の四角柱状に一体形成され、その先端部(図4(a)、(c)、(d)における左側部分)に上記インサート取付座7Aが形成されるとともに、後端部(図4(a)、(c)、(d)における右側部分)には、カートリッジ7をカートリッジ取付座6に取り付けるための取付ネジ8が挿通される段付き穴7Bが形成されている。   FIG. 4 shows a cartridge 7 attached to such a cartridge attachment seat 6, and the cutting blade 9 A is attached to an insert 9 detachably attached to an insert attachment seat 7 A formed on the cartridge 7 by a clamp screw 10. Is formed. This cartridge 7 is formed integrally with a metal material such as steel in the same manner as the tool body 1 in the shape of a quadrangular prism having a substantially trapezoidal cross section, and the above-mentioned cartridge 7 is located at the tip (the left side in FIGS. 4A, 4C, and 4D). An insert mounting seat 7A is formed, and a mounting screw 8 for mounting the cartridge 7 to the cartridge mounting seat 6 is inserted into the rear end portion (the right side portion in FIGS. 4A, 4C, and 4D). A stepped hole 7B is formed.

カートリッジ7は、その断面がなす台形の幅広の上底に連なる側面を工具回転方向Tに向けるとともに、幅狭の下底に連なる側面とこの下底に連なる側面に垂直な側面を、カートリッジ取付座6の工具回転方向Tを向く底面と工具本体1の外周側を向く壁面にそれぞれ密着させ、下底に鈍角に交差するとともに上底に鋭角に交差する上記台形の斜辺(ただし、本実施形態では凸曲線状とされている。)に連なる側面を工具本体1の外周側に向けてカートリッジ取付座6に着座させられる。さらに、上記段付き穴7Bに挿通された取付ネジ8がカートリッジ取付座6に形成されたネジ穴にねじ込まれることにより、この段付き穴7Bが形成された後端部が固定されて、カートリッジ7はカートリッジ取付座6に着脱可能に取り付けられる。   The cartridge 7 has a side surface continuous with the trapezoidal wide upper base formed in the cross section thereof directed in the tool rotation direction T, and a side surface continuous with the lower bottom bottom and a side surface perpendicular to the side surface continuous with the lower bottom The trapezoidal hypotenuse of the above trapezoid that crosses the lower base with an obtuse angle and the upper base with an acute angle (however, in this embodiment) It is seated on the cartridge mounting seat 6 with the side surface connected to the convex curve shape facing the outer peripheral side of the tool body 1. Further, the mounting screw 8 inserted into the stepped hole 7B is screwed into the screw hole formed in the cartridge mounting seat 6, whereby the rear end portion where the stepped hole 7B is formed is fixed, and the cartridge 7 Is detachably attached to the cartridge mounting seat 6.

なお、段付き穴7Bは、図4(b)に示すようにカートリッジ7の上記斜辺に連なる側面から上記下底に連なる側面に垂直な側面に向けて上記下底に連なる側面側に向かうように傾斜して延びており、斜辺に連なる側面側が大径、下底に連なる側面に垂直な側面側が小径とされているとともに、その断面はカートリッジ7の長手方向(工具本体1の軸線O方向)に長軸を有する長円状とされている。また、カートリッジ取付座6に形成されるネジ穴は上記外周側を向く壁面に開口し、段付き穴7Bの傾斜に合わせて穴底側に向かうに従いカートリッジ取付座6の底面側(工具回転方向T後方側)に傾斜するように延びている。   As shown in FIG. 4B, the stepped hole 7B is directed from the side surface continuous with the oblique side of the cartridge 7 toward the side surface perpendicular to the side surface continuous with the lower bottom toward the side surface side continuous with the lower bottom. Inclined and extended, the side surface connected to the hypotenuse has a large diameter, the side surface perpendicular to the side surface connected to the lower base has a small diameter, and the cross section thereof is in the longitudinal direction of the cartridge 7 (the direction of the axis O of the tool body 1). It has an oval shape with a long axis. The screw hole formed in the cartridge mounting seat 6 opens on the wall surface facing the outer peripheral side, and the bottom surface side of the cartridge mounting seat 6 (tool rotation direction T) as it goes toward the bottom of the hole according to the inclination of the stepped hole 7B. It extends so as to incline to the rear side.

さらに、上記インサート取付座7Aは、カートリッジ7の先端面と上記上底に連なる側面と上記斜辺に連なる側面とに開口する凹所として形成されており、本実施形態では菱形平板状のインサート9が装着可能なように、上記上底に連なる側面から一段凹んで工具回転方向Tに向けられる底面と、この底面から上記上底に連なる側面に向けて立ち上がる、互いに鋭角に交差する方向に配置された一対の壁面とを備えている。   Further, the insert mounting seat 7A is formed as a recess opening in the front end surface of the cartridge 7, the side surface connected to the upper base, and the side surface connected to the oblique side. In this embodiment, the insert 9 having a rhomboid plate shape is formed. In order to be able to be mounted, the bottom surface is recessed one step from the side surface connected to the upper base and is directed to the tool rotation direction T, and is arranged in a direction that intersects at an acute angle from the bottom surface toward the side surface continuous to the upper base. And a pair of wall surfaces.

また、底面にはネジ穴が形成されているとともに、インサート9には取付穴が貫通していて、この取付穴に挿通された上記クランプネジ10が底面のネジ穴にねじ込まれることにより、インサート9は、そのすくい面とされる菱形面を上底に連なる側面と同じ向きに向けて、この菱形面のコーナRが付けられた鋭角コーナ部に形成された上記切刃9Aをカートリッジ7の先端面と上記斜辺に連なる側面から僅かに突出させて、インサート取付座7Aに着脱可能に取り付けられる。   In addition, a screw hole is formed on the bottom surface, and an insert hole penetrates the insert 9, and the insert screw 9 is screwed into the screw hole on the bottom surface by inserting the clamp screw 10 inserted through the attachment hole. The cutting edge 9A formed at an acute corner portion with a diamond-shaped corner R is formed so that the rhomboid surface, which is the rake face, faces in the same direction as the side surface connected to the upper base. And is slightly attached to the insert mounting seat 7A so as to be detachable from the side surface connected to the oblique side.

なお、工具本体1の複数のカートリッジ取付座6に取り付けられる複数のカートリッジ7のうち、1つのカートリッジ7(図1に示されているカートリッジ7)には、図4(d)に示すように切刃9Aがサライ刃とされたサライ刃付きインサートが上記インサート9として取り付けられている。このサライ刃付きインサートは、超硬合金等の硬質材料により形成された菱形平板状のインサート本体のすくい面とされる菱形面の1つの鋭角コーナ部に、ダイヤモンド焼結体やCBN(立方小窒化ホウ素)焼結体よりなる切刃部材が接合されたものであって、この鋭角コーナ部からカートリッジ7の後端側に向けて延びる切刃部材上の切刃9Aは、インサート本体上の菱形面の後端側に向けて延びる辺よりも、鋭角コーナ部からカートリッジ7の先端側に延びる菱形面の辺に対する交差角が僅かに大きくされている。   Of the plurality of cartridges 7 attached to the plurality of cartridge mounting seats 6 of the tool body 1, one cartridge 7 (the cartridge 7 shown in FIG. 1) is cut as shown in FIG. An insert with a Saray blade in which the blade 9A is a Saray blade is attached as the insert 9. This insert with a Saray blade is formed of a diamond sintered body or CBN (cubic small nitriding) on one acute corner portion of a rhomboid surface which is a rake face of a rhombus flat plate insert body made of a hard material such as cemented carbide. Boring) A cutting blade member made of a sintered body is joined, and the cutting blade 9A on the cutting blade member extending from the acute corner portion toward the rear end side of the cartridge 7 has a rhombic surface on the insert body. The crossing angle with respect to the side of the rhomboid surface extending from the acute corner portion to the front end side of the cartridge 7 is made slightly larger than the side extending toward the rear end side.

また、このサライ刃付きインサートが取り付けられる1つのカートリッジ7以外の残りのカートリッジ7には、上記切刃部材が接合されることなく、図4(a)〜(c)に示したように超硬合金等の硬質材料のみからなる菱形平板状のインサート本体を備えたインサート9が取り付けられている。上記サライ刃付きのインサート9も含めて、これらのインサート9は、すくい面とされる菱形面を軸線Oを含む平面上に位置させて、この菱形面の2つの鋭角コーナ部のうち1つを上述のように突出させ、サライ刃付きのインサート9は切刃9A(サライ刃)が軸線Oと略平行となるように、またそれ以外のインサート9は、突出した鋭角コーナ部からカートリッジ7の後端側に向けて延びる切刃9Aが後端側に向かうに従いカートリッジ7の上記斜辺に連なる側面側に後退するように傾斜させられて取り付けられる。   Further, the remaining cartridges 7 other than the one cartridge 7 to which the insert with the Sarai blade is attached are not joined with the cutting blade member, and as shown in FIGS. An insert 9 having a rhombic flat plate-like insert body made of only a hard material such as an alloy is attached. These inserts 9, including the insert 9 with a sara blade, have a rhombus surface that is a rake face positioned on a plane including the axis O, and one of the two acute corner portions of the rhombus surface. The insert 9 with the salai blade is protruded as described above so that the cutting edge 9A (saray blade) is substantially parallel to the axis O, and the other inserts 9 are inserted from the protruding acute corner portion to the rear of the cartridge 7. The cutting edge 9A extending toward the end side is inclined and attached so as to recede to the side surface connected to the oblique side of the cartridge 7 toward the rear end side.

さらに、カートリッジ7には、カートリッジ取付座6に取り付けられた状態で工具本体1の内周側を向く面、すなわちカートリッジ取付座6の上記壁面に密着させられる上記下底に垂直な側面に、該カートリッジ7の上記先端部と上記後端部との間において、同じくカートリッジ取付座6に取り付けられた状態で工具回転方向T後方側から前方側に向けて延びる、すなわちカートリッジ7の上記下底に連なる側面から上記上底に連なる側面に向けて延びるスリット7Cが形成されている。   Further, the cartridge 7 has a surface facing the inner peripheral side of the tool body 1 in a state of being attached to the cartridge mounting seat 6, that is, a side surface perpendicular to the lower bottom that is brought into close contact with the wall surface of the cartridge mounting seat 6. Between the front end portion and the rear end portion of the cartridge 7, the tool 7 extends from the rear side to the front side in the tool rotation direction T in a state of being attached to the cartridge mounting seat 6, that is, continues to the lower bottom of the cartridge 7. A slit 7 </ b> C extending from the side surface toward the side surface continuous with the upper bottom is formed.

このスリット7Cは、カートリッジ7の長手方向略中央部において、上記下底に垂直な側面に垂直に、また上記下底に連なる側面と上底に連なる側面との双方に開口するように形成されている。そして、このスリット7Cの上記下底に垂直な側面からの深さは、上記下底に連なる側面から上記上底に連なる側面に向かうに従い、すなわちカートリッジ7がカートリッジ取付座6に取り付けられた状態で工具回転方向T前方側に向かうに従い、漸次深くなるようにされており、特に本実施形態ではスリット7Cの底が、図4(b)に破線で示すようにカートリッジ7の断面がなす台形の斜辺に略平行に延びるようにされている。   The slit 7C is formed at a substantially central portion in the longitudinal direction of the cartridge 7 so as to open to the side surface perpendicular to the lower bottom and to both the side surface continuous to the lower bottom and the side surface continuous to the upper bottom. Yes. The depth of the slit 7C from the side surface perpendicular to the lower bottom is increased from the side surface continuous to the lower bottom to the side surface continuous to the upper bottom, that is, in a state where the cartridge 7 is attached to the cartridge mounting seat 6. In this embodiment, the bottom of the slit 7C is a trapezoidal oblique side formed by the cross section of the cartridge 7 as indicated by a broken line in FIG. 4B. It extends so as to be substantially parallel to.

一方、工具本体1においてカートリッジ取付座6よりも内周側には、カートリッジ取付座6に取り付けられたカートリッジ7の上記スリット7Cよりも先端側の上記上記先端部を工具本体1の外周側に押圧して撓ませることにより、このカートリッジ7に取り付けられたインサート9の上記切刃9Aの外周側への突出量(振れ)を調整する振れ調整機構11が備えられている。   On the other hand, in the tool main body 1, the tip portion closer to the tip than the slit 7 </ b> C of the cartridge 7 attached to the cartridge mounting seat 6 is pressed to the outer peripheral side of the tool main body 1 on the inner peripheral side of the cartridge mounting seat 6. Then, a deflection adjusting mechanism 11 is provided for adjusting the amount of projection (runout) of the insert 9 attached to the cartridge 7 to the outer peripheral side of the cutting blade 9A by bending.

この振れ調整機構11は、本実施形態では、両端部に雄ネジ部12A、12Bを有して一端部の雄ネジ部12Aが工具本体1に形成された雌ネジ穴に螺合させられる振れ調整ネジ12と、工具本体1のカートリッジ取付座6よりも内周側に収容されてカートリッジ7の内周側を向く面(上記下底に連なる側面に垂直な側面)の上記先端部に当接するとともに振れ調整ネジ12の中心線Cに対して傾斜した傾斜面を有して振れ調整ネジ12の他端部の雄ネジ部12Bに螺合させられる調整クサビ部材13とを備えている。   In this embodiment, the runout adjustment mechanism 11 has male screw portions 12A and 12B at both ends, and the runout adjustment in which the male screw portion 12A at one end is screwed into a female screw hole formed in the tool body 1. The screw 12 is in contact with the tip portion of a surface (a side surface perpendicular to the side surface continuous with the lower bottom) that is accommodated on the inner peripheral side of the cartridge mounting seat 6 of the tool body 1 and faces the inner peripheral side of the cartridge 7. An adjustment wedge member 13 having an inclined surface inclined with respect to the center line C of the shake adjustment screw 12 and screwed into the male screw portion 12B at the other end of the shake adjustment screw 12 is provided.

さらに、この調整クサビ部材13は、本実施形態では、カートリッジ取付座6の上記外周側を向く壁面から出没可能とされてカートリッジ7の内周側を向く面の先端部に当接する調整ピン13Aと、振れ調整ネジ12の他端部の雄ネジ部12Bに螺合させられて振れ調整ネジ12の上記中心線C方向に進退可能とされた調整クサビ13Bとを備えている。そして、本実施形態では、これら調整ピン13Aと調整クサビ13Bとが、それぞれ振れ調整ネジ12の中心線Cに対して同じ方向に傾斜した上記傾斜面13C、13D同士を互いに摺接させた構成とされている。   Further, in the present embodiment, the adjustment wedge member 13 can be projected and retracted from the wall surface facing the outer peripheral side of the cartridge mounting seat 6, and the adjustment pin 13 </ b> A is in contact with the tip of the surface facing the inner peripheral side of the cartridge 7. And an adjustment wedge 13B that is screwed into a male screw portion 12B at the other end of the shake adjustment screw 12 so as to be able to advance and retreat in the direction of the center line C of the shake adjustment screw 12. In this embodiment, the adjustment pin 13A and the adjustment wedge 13B are configured such that the inclined surfaces 13C and 13D that are inclined in the same direction with respect to the center line C of the shake adjustment screw 12 are in sliding contact with each other. Has been.

ここで、調整クサビ13Bは、略円筒状の部材であって、その内周部に振れ調整ネジ12の上記他端部の雄ネジ部12Bが螺合する雌ネジ部が形成されているとともに、外周部にはこの調整クサビ13Bがなす円筒の中心線すなわち振れ調整ネジ12の上記中心線Cに対して傾斜した平面状の上記傾斜面13Cが形成されている。このような調整クサビ13Bは、工具本体1の切刃部3におけるヘッド部3Bの先端面から軸線Oに平行に形成された断面円形の穴部に嵌挿されて、傾斜面13Cを外周側に向けてこの傾斜面13Cが工具本体1の後端側に向かうに従い外周側に向けて傾斜するように収容されており、振れ調整ネジ12の一端部の雄ネジ部12Aが螺合される雌ネジ穴は、この穴部の底面に該穴部と同軸に、また調整クサビ13Bの雌ネジ部とも同軸かつ小径に形成されている。   Here, the adjustment wedge 13B is a substantially cylindrical member, and an internal thread portion in which the external thread portion 12B of the other end portion of the shake adjustment screw 12 is screwed is formed on the inner peripheral portion thereof. A flat inclined surface 13C inclined with respect to the center line of the cylinder formed by the adjustment wedge 13B, that is, the center line C of the shake adjusting screw 12 is formed on the outer peripheral portion. Such an adjustment wedge 13B is inserted into a hole having a circular cross section formed in parallel to the axis O from the tip surface of the head portion 3B of the cutting blade portion 3 of the tool body 1, and the inclined surface 13C is placed on the outer peripheral side. The inclined surface 13 </ b> C is accommodated so as to be inclined toward the outer peripheral side toward the rear end side of the tool body 1, and the female screw 12 </ b> A at one end of the runout adjustment screw 12 is screwed together. The hole is formed coaxially with the hole at the bottom of the hole and coaxially with the female thread of the adjusting wedge 13B.

また、調整ピン13Aは、カートリッジ取付座6の工具本体1外周側を向く上記壁面から調整クサビ13Bが収容される上記穴部に向けて上記中心線Cに直交する方向に工具本体1に形成された貫通穴に挿入される略円柱状の部材であり、カートリッジ取付座6側は該調整ピン13Aがなす円柱の中心線に垂直な平面とされて、カートリッジ7先端部の内周側を向く面(カートリッジ7の断面がなす台形の下底に連なる側面に垂直な側面)のうち、インサート取付座7Aの内周側に当接させられる。一方、穴部側は、上記中心線Cに対する調整クサビ13Bの上記傾斜面13Cと等しい傾斜角および傾斜の向きで傾斜した調整ピン13A側の平面状の傾斜面13Dとされている。   The adjustment pin 13A is formed in the tool body 1 in a direction perpendicular to the center line C from the wall surface facing the outer periphery of the tool body 1 of the cartridge mounting seat 6 toward the hole portion in which the adjustment wedge 13B is accommodated. The cartridge mounting seat 6 side is a plane perpendicular to the center line of the cylinder formed by the adjustment pin 13A and faces the inner peripheral side of the tip of the cartridge 7 Among the (side surfaces perpendicular to the bottom surface of the trapezoid formed by the cross section of the cartridge 7), the cartridge 7 is brought into contact with the inner peripheral side of the insert mounting seat 7A. On the other hand, the hole side is a flat inclined surface 13D on the adjustment pin 13A side inclined at the same inclination angle and inclination direction as the inclined surface 13C of the adjustment wedge 13B with respect to the center line C.

さらに、振れ調整ネジ12は、上記穴部底面の雌ネジ穴に螺合する一端部の雄ネジ部12Aが、調整クサビ13Bの雌ネジ部に螺合する他端部の雄ネジ部12Bよりも小径とされており、これら両端部の雄ネジ部12A、12Bは捩れの向きが同じでネジピッチが互いに異なる大きさとされている。従って、穴部底面の雌ネジ穴と調整クサビ13Bの雌ネジ部も、これに合わせて捩れの向きが同じでネジピッチが互いに異なる大きさとされる。   Further, the runout adjusting screw 12 has a male screw portion 12A at one end screwed into the female screw hole on the bottom surface of the hole portion, rather than a male screw portion 12B at the other end screwed into the female screw portion of the adjustment wedge 13B. The male screw portions 12A and 12B at both ends have the same twist direction and different screw pitches. Accordingly, the female screw hole on the bottom surface of the hole and the female screw portion of the adjustment wedge 13B are also sized to have the same twist direction and different screw pitches.

なお、ヘッド部3Bの後端面よりも僅かに手前に位置して工具本体1先端側を向くカートリッジ取付座6の壁面からは軸線Oに平行にネジ穴が形成されてヘッド部3Bの後端面に貫通させられており、このネジ穴にはカートリッジ7の後端面に当接して切刃9Aの軸線O方向の位置を微調整する軸方向調整ネジ14がねじ込まれている。   A screw hole is formed in parallel to the axis O from the wall surface of the cartridge mounting seat 6 that is positioned slightly in front of the rear end surface of the head portion 3B and faces the front end side of the tool body 1, and is formed on the rear end surface of the head portion 3B. An axial adjustment screw 14 that abuts on the rear end surface of the cartridge 7 and finely adjusts the position of the cutting edge 9A in the axis O direction is screwed into the screw hole.

一方、このように工具本体1の切刃部3に形成されたカートリッジ取付座6およびその内周側に設けられた振れ調整機構11に対して、このカートリッジ取付座6に取り付けられたカートリッジ7のインサート9の上記切刃9Aとは軸線Oを間にして180°反対側の切刃部3のヘッド部3B先端部には取付凹部15が形成されており、この取付凹部15には、工具本体1の外周側に球面状の凸曲部を有する押圧部材16が工具本体1の外周側に付勢されて取り付けられている。   On the other hand, the cartridge mounting seat 6 formed on the cutting edge portion 3 of the tool body 1 and the runout adjustment mechanism 11 provided on the inner peripheral side of the cartridge mounting seat 6 are connected to the cartridge mounting seat 6. A mounting recess 15 is formed at the tip of the head portion 3B of the cutting blade 3 on the side opposite to the cutting edge 9A of the insert 9 by 180 ° with the axis O in between. A pressing member 16 having a spherical convex curved portion on the outer peripheral side of 1 is attached to the outer peripheral side of the tool body 1 while being urged.

取付凹部15は、反対側のインサート9の突出させられた切刃9Aより僅かに軸線O方向後端側に位置するように切刃部3のヘッド部3B外周面から軸線Oに垂直に穿設された断面円形の穴部15Aと、この穴部15Aの外周側開口部に穴部15Aの内径より周方向に僅かに幅広に形成されてヘッド部3B先端面から穴部15Aを越えてヘッド部の軸線O方向略中央部まで延び、外周側に「コ」字状に開口する径方向に偏平した溝部15Bとを備えている。また、穴部15Aの穴底側にはパイロット部3Cの先端面からネジ穴15Cが、穴部15Aの中心線に垂直かつ軸線Oに平行に穿設されて連通させられている。   The mounting recess 15 is formed perpendicularly to the axis O from the outer peripheral surface of the head portion 3B of the cutting edge portion 3 so as to be positioned slightly on the rear end side in the axis O direction with respect to the cutting edge 9A from which the insert 9 on the opposite side is projected. The hole portion 15A having a circular cross section and the opening on the outer peripheral side of the hole portion 15A are formed slightly wider in the circumferential direction than the inner diameter of the hole portion 15A, over the hole portion 15A from the tip surface of the head portion 3B and the head portion. And a groove portion 15B that is flattened in the radial direction and opens in a “U” shape on the outer peripheral side. Further, a screw hole 15C is formed on the bottom side of the hole portion 15A from the front end surface of the pilot portion 3C so as to be perpendicular to the center line of the hole portion 15A and parallel to the axis O, and communicated therewith.

取付凹部15の溝部15Bには、プレート17が嵌合させられて、その後端部に挿通されたクランプネジ18が工具本体1にねじ込まれることにより取り付けられている。このプレート17には、内周部が取付凹部15の穴部15Aと同径の断面円形の穴とされるとともに、外周部は外周側に向かうに従い漸次縮径するテーパ状とされてプレート17の外周面に開口する係止穴17Aが形成されて、プレート17を取り付けた状態でこの係止穴17Aが取付凹部15の穴部15Aと同軸となるようにされている。   The plate 17 is fitted in the groove 15B of the mounting recess 15 and is attached by screwing the clamp screw 18 inserted through the rear end thereof into the tool body 1. In this plate 17, the inner peripheral portion is formed as a circular hole having the same diameter as the hole portion 15 A of the mounting recess 15, and the outer peripheral portion is tapered so as to gradually decrease in diameter toward the outer peripheral side. A locking hole 17A opening on the outer peripheral surface is formed, and the locking hole 17A is coaxial with the hole 15A of the mounting recess 15 in a state where the plate 17 is mounted.

また、プレート17の内周面には、プレート17の後端面から先端側に僅かに間隔をあけた位置から係止穴17Aに向けて延びて連通する溝17Bが形成されている。さらに、取付凹部15の溝部15Bの後端部には、上記分岐穴4Aとは別に工具本体1の供給穴4から分岐した他の分岐穴4Bが開口させられて、溝17Bに連通させられている。なお、この他の分岐穴4Bの溝部15Bへの開口部近くには、溝17Bに供給される切削油剤(潤滑油剤)の供給量調整のための小径穴が貫通したプラグ19がねじ込まれている。   Further, on the inner peripheral surface of the plate 17, a groove 17 </ b> B is formed that extends from a position slightly spaced from the rear end surface of the plate 17 toward the front end side and communicates with the locking hole 17 </ b> A. Further, in addition to the branch hole 4A, another branch hole 4B branched from the supply hole 4 of the tool body 1 is opened at the rear end portion of the groove 15B of the mounting recess 15 and communicated with the groove 17B. Yes. In addition, a plug 19 through which a small-diameter hole for adjusting the supply amount of the cutting fluid (lubricant) supplied to the groove 17B is screwed is screwed near the opening of the other branch hole 4B to the groove 15B. .

こうしてプレート17が取り付けられた取付凹部15の穴部15Aとプレート17の係止穴17Aとには、工具本体1の内周側から順に、付勢力調整部材20Aと、本実施形態において押圧部材16を外周側に付勢する弾性部材としての圧縮コイルバネ21と、当接部材22と、そして上記押圧部材16とが収容されるとともに、上記ネジ穴15Cには付勢力調整ネジ20Bがねじ込まれて、これら付勢力調整部材20Aおよび付勢力調整ネジ20Bにより付勢力調整機構20が構成される。   The urging force adjusting member 20A and the pressing member 16 in this embodiment are formed in the hole 15A of the mounting recess 15 to which the plate 17 is mounted in this manner and the locking hole 17A of the plate 17 in this order from the inner peripheral side of the tool body 1. A compression coil spring 21 as an elastic member that biases the outer peripheral side toward the outer peripheral side, the abutting member 22, and the pressing member 16 are housed, and a biasing force adjusting screw 20B is screwed into the screw hole 15C. The urging force adjusting mechanism 20 is constituted by the urging force adjusting member 20A and the urging force adjusting screw 20B.

付勢力調整部材20Aは、穴部15Aに嵌挿可能な外径の略円柱状をなし、ただしその工具本体1内周側に向けられる端部には、この付勢力調整部材20Aがなす円柱の中心線に対して傾斜した平面状の切欠面が形成されていて、この切欠面をネジ穴15C側に向けて穴部15Aに収容されている。また、付勢力調整ネジ20Bは、工具本体1の後端側に向けられる端部が円錐状に形成されており、この端部を付勢力調整部材20Aの上記切欠面に当接させてネジ穴15Cにねじ込まれている。   The urging force adjusting member 20A has a substantially cylindrical shape with an outer diameter that can be inserted into the hole 15A. However, an end of the urging force adjusting member 20A that is directed toward the inner peripheral side of the tool body 1 has a cylindrical shape. A flat cut-out surface inclined with respect to the center line is formed, and the cut-out surface is accommodated in the hole portion 15A with the cut-out surface facing the screw hole 15C side. Further, the urging force adjusting screw 20B has a conical end portion directed toward the rear end side of the tool body 1, and this end portion is brought into contact with the notch surface of the urging force adjusting member 20A so as to have a screw hole. Screwed into 15C.

さらに、弾性部材としての圧縮コイルバネ21も、穴部15Aに嵌挿可能な外径を有するものであって、反対側の切刃9Aに作用する背分力の1/2〜1/5程度の弾性力で押圧部材16を押圧するように圧縮されて穴部15Aに収容されている。また、当接部材22は、これら押圧部材16と圧縮コイルバネ21との間に介装される、穴部15Aに嵌挿可能な円板である。   Furthermore, the compression coil spring 21 as an elastic member also has an outer diameter that can be inserted into the hole 15A, and is about 1/2 to 1/5 of the back component force acting on the opposite cutting edge 9A. It is compressed so as to press the pressing member 16 with an elastic force and is accommodated in the hole 15A. The abutting member 22 is a disc that is interposed between the pressing member 16 and the compression coil spring 21 and can be inserted into the hole 15A.

さらにまた、押圧部材16は、本実施形態では超硬合金等の硬質材料によって形成された球体であって取付凹部15内で転動可能とされ、その直径はやはり穴部15Aに嵌挿可能な大きさとされ、当接部材22を介して圧縮コイルバネ21により外周側に押圧されることによって付勢されて、プレート17の係止穴17Aのテーパ状に縮径した外周部に当接し、その表面の一部を上記球面状の凸曲部としてこの係止穴17Aの開口部から工具本体1の外周側に突出させている。こうして係止穴17Aの開口部から突出した凸曲部の突端までの軸線Oからの半径は、軸線Oから切刃9Aまでの半径よりも僅かに大きくされている。   Furthermore, in this embodiment, the pressing member 16 is a sphere formed of a hard material such as a cemented carbide and can be rolled in the mounting recess 15, and the diameter thereof can also be inserted into the hole 15 </ b> A. It is sized and pressed by the compression coil spring 21 through the contact member 22 to the outer peripheral side, and is brought into contact with the outer peripheral portion of the locking hole 17A of the plate 17 which has a reduced diameter, and its surface. Is projected from the opening of the locking hole 17A to the outer peripheral side of the tool body 1 as a spherical convex curved portion. Thus, the radius from the axis O to the protruding end of the convex portion protruding from the opening of the locking hole 17A is slightly larger than the radius from the axis O to the cutting edge 9A.

このように構成された穴加工工具では、軸方向調整ネジ14でカートリッジ7の軸線O方向の位置を調整した上で、各カートリッジ7の切刃9Aの外径を振れ調整機構11によって調整して所定の内径の加工穴が形成されるように一致させる。この振れ調整機構11においては、振れ調整ネジ12を回転させて調整クサビ部材13の調整クサビ13Bを工具本体1先端側に移動させることにより、この調整クサビ13Bの傾斜面13Cが傾斜面13Dを介して調整ピン13Aを押圧して外周側に突出させ、この調整ピン13Aがカートリッジ7の先端部に当接して、この先端部を外周側に撓むように弾性変形させ、これに伴いカートリッジ7先端部に取り付けられたインサート9の切刃9Aの軸線Oからの半径が微調整される。   In the hole drilling tool configured as described above, the position of the cartridge 7 in the axis O direction is adjusted by the axial direction adjusting screw 14, and the outer diameter of the cutting edge 9 </ b> A of each cartridge 7 is adjusted by the shake adjusting mechanism 11. It matches so that the processing hole of a predetermined internal diameter may be formed. In the shake adjusting mechanism 11, the shake adjusting screw 12 is rotated to move the adjustment wedge 13B of the adjustment wedge member 13 to the tip side of the tool body 1, whereby the inclined surface 13C of the adjustment wedge 13B passes through the inclined surface 13D. Then, the adjustment pin 13A is pressed to protrude to the outer peripheral side, and the adjustment pin 13A comes into contact with the front end portion of the cartridge 7 and elastically deforms so that the front end portion bends to the outer peripheral side. The radius from the axis O of the cutting edge 9A of the attached insert 9 is finely adjusted.

また、付勢力調整機構20により、押圧部材16に与えられる付勢力を調整する。すなわち、付勢力調整ネジ20Bを回転させてネジ穴15C内で進退させることにより、この付勢力調整ネジ20Bの円錐状の端部に切欠面が当接した付勢力調整部材20Aも取付凹部15の穴部15A内で工具本体1の径方向に進退し、これに伴い弾性部材としての圧縮コイルバネ21の圧縮量が調節されるので、この圧縮コイルバネ21による押圧部材16の付勢力も被削材や加工条件等に応じた適正な強さに調整される。   Further, the urging force applied to the pressing member 16 is adjusted by the urging force adjusting mechanism 20. That is, by rotating the urging force adjusting screw 20B and moving it forward and backward in the screw hole 15C, the urging force adjusting member 20A in which the notch surface abuts on the conical end portion of the urging force adjusting screw 20B is also attached to the mounting recess 15. Since the amount of compression of the compression coil spring 21 as an elastic member is adjusted in the radial direction of the tool body 1 in the hole portion 15A, the urging force of the pressing member 16 by the compression coil spring 21 is also affected by the work material, It is adjusted to an appropriate strength according to the processing conditions.

こうして切刃9Aの外径と押圧部材16の付勢力が調整されたなら、供給穴4に切削油剤を供給しつつ、工具本体1を軸線O回りに回転させて該軸線O方向先端側に被削材に対して相対的に前進させて、被削材に予め形成された下穴に切刃部3を挿入し、切刃9Aによってこの下穴を切削して上記所定の内径の加工穴に形成する。そして、このように形成された加工穴に押圧部材16が挿入されると、外周側への付勢力に抗して押圧部材16が工具本体1内周側に押し込まれ、この押圧部材16の球面状の凸曲部が加工穴の内壁面に摺接しながら穴加工が行われる。   When the outer diameter of the cutting edge 9A and the urging force of the pressing member 16 are adjusted in this way, the tool body 1 is rotated around the axis O while supplying the cutting fluid to the supply hole 4, and is moved toward the front end side in the axis O direction. Advancing relatively with respect to the work material, the cutting blade portion 3 is inserted into a pre-formed hole formed in the work material, and the prepared hole is cut by the cutting blade 9A to form a work hole having the predetermined inner diameter. Form. When the pressing member 16 is inserted into the machining hole formed in this way, the pressing member 16 is pressed into the inner peripheral side of the tool body 1 against the biasing force toward the outer peripheral side, and the spherical surface of the pressing member 16 Hole processing is performed while the convex portion of the shape slides on the inner wall surface of the processing hole.

従って、このように加工面の内壁面に摺接した状態での押圧部材16の凸曲部の突端の外径は加工穴の内径すなわち切刃9Aの外径と等しくなり、各切刃9Aのそれぞれ反対側に位置する押圧部材16と切刃9Aとで工具本体1を支持するようにして穴加工が行われる。このため、上記構成の穴加工工具によれば、工具本体1に撓みによる振れを生じさせることなく、工具本体1を正確に軸線O回りに回転させて穴加工を行うことができ、ビビリ振動を防止して穴加工精度の向上を図ることができる。   Accordingly, the outer diameter of the protruding end of the convex portion of the pressing member 16 in the state of sliding contact with the inner wall surface of the processing surface becomes equal to the inner diameter of the processing hole, that is, the outer diameter of the cutting blade 9A. Drilling is performed so that the tool body 1 is supported by the pressing member 16 and the cutting edge 9A that are located on the opposite sides. For this reason, according to the drilling tool having the above-described configuration, the tool body 1 can be accurately rotated around the axis O without causing the tool body 1 to bend due to bending, and chatter vibration can be generated. This can prevent the hole machining accuracy from being improved.

また、上記構成の穴加工工具では、このように切刃9Aによって形成された加工穴に押圧部材16が挿入されることによって付勢力に抗して工具本体1内周側に押し込まれて凸曲部が加工穴の内壁面に摺接するので、従来のガイドパッドのように切刃9Aとの微妙なクリアラスの設定を要することがない。さらに、押圧部材16が工具本体1内周側に押し込まれていない状態での凸曲部の突端の外径(軸線Oからの半径)を切刃9Aの外径(同半径)よりもやや大きめに設定したり、付勢力調整機構20によって押圧部材16の付勢力を調整したりすることにより、被削材や加工条件が変わっても確実に凸曲部を加工穴の内壁面に適正な押圧力で押圧して摺接させ、工具本体1を支持することが可能である。   Further, in the hole machining tool having the above-described configuration, the pressing member 16 is inserted into the machining hole formed by the cutting blade 9A in this way, and is pushed into the inner peripheral side of the tool body 1 against the urging force, thereby forming a convex curve. Since the portion is in sliding contact with the inner wall surface of the machining hole, it is not necessary to set a delicate clear lath with the cutting edge 9A unlike a conventional guide pad. Further, the outer diameter (radius from the axis O) of the convex curved portion when the pressing member 16 is not pushed into the inner peripheral side of the tool body 1 is slightly larger than the outer diameter (same radius) of the cutting blade 9A. By adjusting the urging force of the pressing member 16 with the urging force adjusting mechanism 20, it is ensured that the convex curved portion is properly pressed against the inner wall surface of the machining hole even if the work material and machining conditions change. It is possible to support the tool body 1 by pressing it with pressure to make sliding contact.

さらにまた、本実施形態では、この押圧部材16が球体とされていて、その全体が球面状の凸曲部とされており、取付凹部15の穴部15Aとプレート17の係止穴17Aに転動可能に収容されている。この点、例えば穴部15Aに嵌挿可能な円柱の工具本体1外周側に半球状部が一体に形成された押圧部材を、半球状部が係止穴17Aから突出するように圧縮コイルバネ21によって付勢して取付凹部15に取り付けた場合には、半球状部の突端一点だけが常に加工穴の内壁面と摺接することになり、早期の摩耗を招くおそれがある。 Furthermore, in the present embodiment, the pressing member 16 is a sphere, and the entirety thereof is a spherical convex curved portion, and is transferred to the hole portion 15A of the mounting concave portion 15 and the locking hole 17A of the plate 17. It is housed movably. In this regard, for example, a pressing member in which a hemispherical portion is integrally formed on the outer peripheral side of a cylindrical tool body 1 that can be inserted into the hole portion 15A, is compressed by a compression coil spring 21 so that the hemispherical portion protrudes from the locking hole 17A. when attached to the mounting recess 15 is urged, will be only tip one point of the hemispherical portion is in contact at all times in sliding with the inner wall surface of the machined hole, which may lead to premature wear.

ところが、これに対して本実施形態のように転動可能な球体を押圧部材16として用いると、一点だけが加工穴の内壁面に摺接するのを転動によって避けることができるので、押圧部材16が部分的に摩耗して短寿命となるのを防ぐことができる。特に本実施形態では、この押圧部材16がインサート9の本体と同じ超硬合金等の硬質材料によって形成されているので、摩耗をさらに抑制することができる。   However, when a rollable sphere as in the present embodiment is used as the pressing member 16 as opposed to this, it is possible to avoid that only one point is in sliding contact with the inner wall surface of the processing hole by the rolling. Can be prevented from being partially worn and having a short life. In particular, in the present embodiment, the pressing member 16 is formed of a hard material such as a cemented carbide similar to the main body of the insert 9, so that wear can be further suppressed.

さらに、穴加工時に供給穴4に供給された切削油剤は、分岐穴4Aから切刃9Aに向けて噴出させられて切刃9Aや被削材の切削部位に供給され、これらの潤滑や冷却を行うとともに、他の分岐穴4Bからプレート17の溝17Bを介して押圧部材16が収容された係止穴17Aおよび取付凹部15の穴部15Aにも供給される。そして、球体状の押圧部材16の転動に伴い、切削油剤は押圧部材16と加工穴の内壁面との間にも回り込んでこれらを潤滑するので、本実施形態によれば押圧部材16の摩耗をより一層低減することができる。しかも、この取付凹部15側への切削油剤(潤滑油剤)の供給量は、プラグ19の小径穴によって制限されているので、切刃9Aへの切削油剤の供給量が必要以上に低減するようなことはない。   Further, the cutting fluid supplied to the supply hole 4 at the time of drilling is ejected from the branch hole 4A toward the cutting edge 9A and supplied to the cutting edge 9A and the cutting site of the work material, and lubrication and cooling thereof are performed. At the same time, the other branch hole 4B is also supplied to the locking hole 17A in which the pressing member 16 is accommodated and the hole 15A of the mounting recess 15 through the groove 17B of the plate 17. Then, as the spherical pressing member 16 rolls, the cutting fluid wraps around between the pressing member 16 and the inner wall surface of the machining hole and lubricates them. Wear can be further reduced. Moreover, since the amount of cutting fluid (lubricant) supplied to the mounting recess 15 is limited by the small diameter hole of the plug 19, the amount of cutting fluid supplied to the cutting blade 9A is reduced more than necessary. There is nothing.

さらにまた、本実施形態では、押圧部材16を外周側に付勢するのに圧縮コイルバネ21のような弾性部材が用いられているとともに、工具本体1にはこの弾性部材による付勢力を調整する付勢力調整機構20が備えられている。このため、上述のように被削材や加工条件等に応じてこの弾性部材の付勢力を調整する場合でも、圧縮コイルバネ21をバネ定数の異なるものに交換したりすることなく、容易に付勢力の調整が可能である。   Furthermore, in the present embodiment, an elastic member such as the compression coil spring 21 is used to urge the pressing member 16 toward the outer peripheral side, and the tool body 1 is attached with an adjustment for adjusting the urging force by the elastic member. A force adjusting mechanism 20 is provided. For this reason, even when adjusting the urging force of this elastic member according to the work material, processing conditions, etc. as described above, the urging force can be easily changed without replacing the compression coil spring 21 with one having a different spring constant. Can be adjusted.

一方、本実施形態では、カートリッジ取付座6に取り付けられたカートリッジ7の先端部を工具本体1外周側に押圧して撓ませることにより、このカートリッジ7のインサート取付座7Aに取り付けられたインサート9の切刃9Aの突出量を調整する振れ調整機構11がカートリッジ取付座6の内周側に備えられており、この切刃9Aの突出量(振れ)も比較的容易に調整することができる。   On the other hand, in the present embodiment, the tip of the cartridge 7 attached to the cartridge attachment seat 6 is pressed and bent toward the outer peripheral side of the tool body 1, so that the insert 9 attached to the insert attachment seat 7 </ b> A of the cartridge 7. A shake adjusting mechanism 11 for adjusting the protruding amount of the cutting blade 9A is provided on the inner peripheral side of the cartridge mounting seat 6, and the protruding amount (runout) of the cutting blade 9A can be adjusted relatively easily.

しかも、本実施形態では、上記インサート取付座7Aが形成された先端部とカートリッジ7を固定するための段付き穴7Bが形成された後端部との間の、カートリッジ7の工具本体1内周側を向く面(カートリッジ7の断面がなす台形の下底に連なる側面に垂直な側面)に、工具本体1にカートリッジ7を取り付けた状態で工具回転方向Tの後方側から前方側に向けて延びるスリット7Cが形成されており、従って切刃9Aが設けられたカートリッジ7の先端部を弾性変形によって外周側に撓ませ易くして、一層容易な振れ調整を行うことが可能となる。   Moreover, in the present embodiment, the inner periphery of the tool body 1 of the cartridge 7 between the front end portion where the insert mounting seat 7A is formed and the rear end portion where the stepped hole 7B for fixing the cartridge 7 is formed. It extends from the rear side in the tool rotation direction T toward the front side with the cartridge 7 attached to the tool body 1 on the side facing the side (the side surface perpendicular to the side surface connected to the bottom of the trapezoid formed by the cross section of the cartridge 7). Since the slit 7C is formed, the tip portion of the cartridge 7 provided with the cutting edge 9A can be easily bent to the outer peripheral side by elastic deformation, so that it is possible to perform easier shake adjustment.

そして、さらにこのスリット7Cの深さは、工具回転方向T前方側に向かうに従い漸次深くなるようにされている。このため、振れ調整機構11によってカートリッジ7の先端部を外周側に向けて押圧する際に、工具本体1の周方向にはカートリッジ7先端部はスリット7Cが深くされた工具回転方向T前方側の方が工具回転方向T後方側よりも撓み易くなり、結果的にカートリッジ7の先端部はカートリッジ取付座6の工具回転方向T側を向く底面に押し付けられるように撓ませられることになる。   Further, the depth of the slit 7C is gradually increased toward the front side in the tool rotation direction T. Therefore, when the tip of the cartridge 7 is pressed toward the outer peripheral side by the shake adjusting mechanism 11, the tip of the cartridge 7 in the circumferential direction of the tool body 1 is on the front side in the tool rotation direction T in which the slit 7C is deepened. As a result, the tip end portion of the cartridge 7 is bent so as to be pressed against the bottom surface of the cartridge mounting seat 6 facing the tool rotation direction T side.

従って、これとは逆に外周側に撓ませられたカートリッジ7先端部がカートリッジ取付座6の底面から離れて僅かに浮き上がったまま振れ調整が行われ、穴加工時にカートリッジ7先端部にがたつきが生じたり、この浮き上がった先端部が切刃9Aに作用する切削負荷によってカートリッジ取付座6底面に押し付けられることにより、調整された切刃9Aの振れが変化したりしてしまうのを防ぐことができるので、本実施形態によれば、より高精度の穴加工を行うことが可能となる。   Therefore, on the contrary, the tip of the cartridge 7 bent toward the outer peripheral side is adjusted slightly while being lifted slightly away from the bottom surface of the cartridge mounting seat 6, and the cartridge 7 is rattled at the tip of the cartridge 7 during drilling. It is possible to prevent the adjusted leading edge 9A from being changed due to the occurrence of the above-mentioned or the pressing tip of the lifted edge being pressed against the bottom surface of the cartridge mounting seat 6 by the cutting load acting on the cutting edge 9A. Therefore, according to the present embodiment, it is possible to perform hole drilling with higher accuracy.

また、本実施形態における振れ調整機構11は、両端部に雄ネジ部12A、12Bを有して一端部の雄ネジ部12Aが工具本体1に形成された雌ネジ穴に螺合させられる振れ調整ネジ12と、工具本体1のカートリッジ取付座6よりも内周側に収容されてカートリッジ7の内周側を向く面の先端部に当接するとともに振れ調整ネジ12の中心線Cに対して傾斜した傾斜面13C、13Dを有して振れ調整ネジ12の他端部の雄ネジ部12Bに螺合させられる調整クサビ部材13とを備えており、振れ調整ネジ12の両端部の雄ネジ部12A、12Bは捩れの向きが同じでネジピッチが互いに異なる大きさとされている。   Further, the shake adjustment mechanism 11 according to the present embodiment has the male screw portions 12A and 12B at both ends, and the shake adjustment in which the male screw portion 12A at one end is screwed into a female screw hole formed in the tool body 1. The screw 12 is in contact with the tip of the surface of the tool body 1 that is accommodated on the inner peripheral side of the cartridge mounting seat 6 and faces the inner peripheral side of the cartridge 7 and is inclined with respect to the center line C of the deflection adjusting screw 12. An adjustment wedge member 13 having inclined surfaces 13C and 13D and screwed into a male screw portion 12B at the other end of the shake adjustment screw 12, and a male screw portion 12A at both ends of the shake adjustment screw 12. 12B has the same twist direction and different screw pitches.

従って、振れ調整ネジ12を回転させて調整クサビ部材13を中心線C方向に進退させることにより、この調整クサビ部材13の傾斜面13C、13Dによって該調整クサビ部材13が当接したカートリッジ7先端部を外周側に弾性変形させて撓ませる際に、振れ調整ネジ12の回転量に対する調整クサビ部材13の進退量を雄ネジ部12A、12Bのネジピッチの差分として小さくすることができる。このため、より微少な切刃9Aの振れ調整が可能であって、さらに高精度の穴加工が可能となる。   Therefore, by rotating the deflection adjusting screw 12 to advance and retract the adjusting wedge member 13 in the direction of the center line C, the tip end portion of the cartridge 7 in which the adjusting wedge member 13 is in contact with the inclined surfaces 13C and 13D of the adjusting wedge member 13 is obtained. When this is bent by elastically deforming the outer peripheral side, the amount of advancement / retraction of the adjustment wedge member 13 relative to the amount of rotation of the shake adjustment screw 12 can be reduced as the difference in screw pitch between the male screw portions 12A, 12B. For this reason, it is possible to finely adjust the deflection of the cutting edge 9A, and it is possible to perform drilling with higher accuracy.

また、上記調整クサビ部材13はさらに、本実施形態ではカートリッジ取付座6の外周側を向く壁面から出没可能とされてカートリッジ7の内周側を向く面の先端部に当接する調整ピン13Aと、振れ調整ネジ12の他端部の雄ネジ部12Bに螺合させられて上述のように振れ調整ネジ12の中心線C方向に進退可能とされた調整クサビ13Bとを備えており、これら調整ピン13Aと調整クサビ13Bとが、それぞれ振れ調整ネジ12の中心線Cに対して同じ方向に傾斜した上記傾斜面13C、13D同士を互いに摺接させて構成されている。   Further, the adjustment wedge member 13 is further adjustable in the present embodiment from the wall surface facing the outer peripheral side of the cartridge mounting seat 6, and an adjustment pin 13 </ b> A that comes into contact with the tip of the surface facing the inner peripheral side of the cartridge 7. The adjustment wedge 13B that is screwed into the male screw portion 12B at the other end of the shake adjustment screw 12 and can be moved back and forth in the direction of the center line C of the shake adjustment screw 12 as described above. 13A and adjustment wedge 13B are configured such that the inclined surfaces 13C and 13D that are inclined in the same direction with respect to the center line C of the shake adjusting screw 12 are brought into sliding contact with each other.

この点、例えばカートリッジ7の先端部に調整クサビ13Bの傾斜面13Cと同じ方向に傾斜する傾斜面を形成してこれらを互いに摺接させ、調整クサビ13Bの進退によって直接カートリッジ7先端部を押圧して外周側に撓ませることにより振れ調整を行うことも可能ではあるが、その場合にはカートリッジ7先端部と調整クサビ13Bとの当接位置も調整クサビ13Bの進退に伴って変化するのに対し、本実施形態ではカートリッジ7先端部への調整ピン13Aの当接位置は変化することがないので、より安定した切刃9Aの振れ調整を行うことが可能となる。   In this respect, for example, an inclined surface inclined in the same direction as the inclined surface 13C of the adjustment wedge 13B is formed at the distal end portion of the cartridge 7, and these are brought into sliding contact with each other, and the front end portion of the cartridge 7 is directly pressed by the advancement and retraction of the adjustment wedge 13B. Although it is possible to adjust the deflection by bending it toward the outer peripheral side, in that case, the contact position between the tip of the cartridge 7 and the adjustment wedge 13B also changes as the adjustment wedge 13B advances and retreats. In this embodiment, since the contact position of the adjustment pin 13A with the tip of the cartridge 7 does not change, it is possible to perform more stable swing adjustment of the cutting blade 9A.

さらにまた、本実施形態では、工具本体1先端部の切刃部3におけるヘッド部3B外周に突設させられた複数の切刃9Aのうち、1つの切刃9Aはサライ刃とされて後端側に向けて軸線Oに略平行に延びるようにされるとともに、残りの切刃9Aは後端側に向かうに従いカートリッジ7の上記斜辺に連なる側面側すなわち工具本体1内周側に後退するように傾斜させられている。このため、これら残りの切刃9Aによって切削された加工穴の内壁面に残る凹凸を、サライ刃とされる切刃9Aによって平滑に仕上げることができ、上述のように高精度で、しかも面精度に優れた加工穴を形成することが可能となる。   Furthermore, in the present embodiment, one of the plurality of cutting blades 9A that protrudes from the outer periphery of the head portion 3B of the cutting blade portion 3 at the tip end portion of the tool body 1 is a salai blade, and the rear end. The remaining cutting edge 9A is set to extend substantially parallel to the axis O toward the side, and retreats toward the side surface continuous to the oblique side of the cartridge 7, that is, the inner peripheral side of the tool body 1 toward the rear end side. It is tilted. For this reason, the unevenness remaining on the inner wall surface of the processed hole cut by the remaining cutting blade 9A can be smoothly finished by the cutting blade 9A that is a Saray blade, and has high accuracy and surface accuracy as described above. It is possible to form an excellent processed hole.

1 工具本体
2 シャンク部
3 切刃部
4 供給穴
4A、4B 分岐穴
6 カートリッジ取付座
7 カートリッジ
7C スリット
9 インサート
9A 切刃
11 振れ調整機構11
12 振れ調整ネジ
12A、12B 雄ネジ部
13 調整クサビ部材
13A 調整ピン
13B 調整クサビ
13C、13D 傾斜面
15 取付凹部
16 押圧部材
17 プレート
17B 溝
19 プラグ
20 付勢力調整機構
20A 付勢力調整部材
20B 付勢力調整ネジ
21 圧縮コイルバネ(弾性部材)
O 工具本体1の軸線
T 工具回転方向
C 振れ調整ネジ12の中心線
DESCRIPTION OF SYMBOLS 1 Tool main body 2 Shank part 3 Cutting blade part 4 Supply hole 4A, 4B Branch hole 6 Cartridge mounting seat 7 Cartridge 7C Slit 9 Insert 9A Cutting blade 11 Runout adjustment mechanism 11
12 Shaking adjustment screws 12A, 12B Male thread portion 13 Adjustment wedge member 13A Adjustment pin 13B Adjustment wedge 13C, 13D Inclined surface 15 Mounting recess 16 Pressing member 17 Plate 17B Groove 19 Plug 20 Energizing force adjusting mechanism 20A Energizing force adjusting member 20B Energizing force Adjustment screw 21 Compression coil spring (elastic member)
O Tool body 1 axis T Tool rotation direction C Center line of runout adjustment screw 12

Claims (2)

軸線回りに回転される上記軸線を中心とした円柱状の工具本体の先端部外周に切刃が突設されるとともに、上記工具本体の先端部の上記軸線を間にして上記切刃とは反対側に形成された取付凹部には、上記切刃よりも上記軸線方向後端側に、上記工具本体の外周側に球面状の凸曲部を有する押圧部材が該工具本体の外周側に付勢されて取り付けられ
上記押圧部材は球体であって、上記取付凹部において転動可能に取り付けられているとともに、
上記取付凹部には潤滑油剤が供給可能とされていることを特徴とする穴加工工具。
A cutting blade protrudes from the outer periphery of the tip of the cylindrical tool body centered on the axis rotated around the axis, and is opposite to the cutting blade with the axis of the tip of the tool body in between. In the mounting recess formed on the side, a pressing member having a spherical convex portion on the outer peripheral side of the tool main body is biased toward the outer peripheral side of the tool main body on the rear end side in the axial direction from the cutting edge. Attached ,
The pressing member is a sphere, and is attached so as to be able to roll in the mounting recess,
A drilling tool characterized in that a lubricant can be supplied to the mounting recess .
上記押圧部材は弾性部材によって付勢されているとともに、上記工具本体には上記弾性部材による付勢力を調整する付勢力調整機構が備えられていることを特徴とする請求項1に記載の穴加工工具。 2. The hole machining according to claim 1 , wherein the pressing member is biased by an elastic member, and the tool body is provided with a biasing force adjusting mechanism for adjusting a biasing force by the elastic member. tool.
JP2012021130A 2012-02-02 2012-02-02 Drilling tool Expired - Fee Related JP5803707B2 (en)

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GB2574437A (en) * 2018-06-06 2019-12-11 Caterpillar Inc Cutting tool
CN112589484A (en) * 2020-10-30 2021-04-02 中北大学 Hole machining method for lathe or boring machine
CN112453953A (en) * 2020-10-30 2021-03-09 中北大学 Machining device for lathe or boring machine

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US2278988A (en) * 1940-07-24 1942-04-07 Leblond Mach Tool Co R K Boring tool holder
JPS5880113U (en) * 1981-11-24 1983-05-31 日産自動車株式会社 Tool holder for deep hole machining
JPS62120904A (en) * 1985-11-15 1987-06-02 Mitsubishi Heavy Ind Ltd Balance type boring tool
JPH0219418U (en) * 1988-07-26 1990-02-08
JPH0529606U (en) * 1991-09-25 1993-04-20 オークマ株式会社 Deep hole drilling tool
JPH1110432A (en) * 1997-06-17 1999-01-19 Nissan Motor Co Ltd Combined tool

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