JP2712580B2 - Boring byte - Google Patents
Boring byteInfo
- Publication number
- JP2712580B2 JP2712580B2 JP1163302A JP16330289A JP2712580B2 JP 2712580 B2 JP2712580 B2 JP 2712580B2 JP 1163302 A JP1163302 A JP 1163302A JP 16330289 A JP16330289 A JP 16330289A JP 2712580 B2 JP2712580 B2 JP 2712580B2
- Authority
- JP
- Japan
- Prior art keywords
- neck
- shank
- cutting edge
- tip
- axis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
- Drilling Tools (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ この発明は、旋削加工において被削材の内径加工を行
う際に用いられる中ぐりバイトに関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boring tool used when performing an inner diameter machining of a work material in turning.
［従来の技術］ 従来、この種の中ぐりバイトとしては、例えば、第11
図ないし第13図、あるいは第14図ないし第16図に示すよ
うに、先端の一側部にスローアウエイチツプ（以下、チ
ツプと略称する。）１が装着された刃先部２と、この刃
先部２の基端側に形成された円柱状の首部３と、この首
部３の基端側に形成された略円柱状のシャンク４とから
概略構成されてなるものが知られている。[Prior Art] Conventionally, as this kind of boring tool, for example,
As shown in FIG. 13 to FIG. 13 or FIG. 14 to FIG. 16, a cutting edge 2 having a throw-away tip (hereinafter abbreviated as “chip”) 1 attached to one side of a tip thereof, and this cutting edge 2 is known which is roughly composed of a columnar neck 3 formed on the base end side and a substantially columnar shank 4 formed on the base end side of the neck 3.
ここで、上記チツプ１は、平面視略菱形をなすもの
で、対向する二の角部に形成された切刃５のいずれか一
方が上記刃先部２の先端及び外周から突出された状態で
上記刃先部２に着脱自在に装着されている。Here, the chip 1 has a substantially rhombic shape in a plan view, and one of the cutting blades 5 formed at two opposing corners is protruded from the tip and the outer periphery of the cutting edge 2. It is detachably attached to the blade tip 2.
また、上記首部３の直径ｄ1は、上記シャンク４の直
径ｄ2より小さく、すなわち、上記刃先部２と同一径
（第11図）、若しくは刃先部２よりも小径（第14図）に
設定され、より具体的には、上記刃先部２のシャンク軸
線方向からの正面視におけるシャンク軸線Ｏからチツプ
１の切刃５までの距離Ｓに対して1.4S以下に定められて
いる。The diameter d 1 of the neck 3 is smaller than the diameter d 2 of the shank 4, that is, the same diameter as the cutting edge 2 (FIG. 11) or smaller than the cutting edge 2 (FIG. 14). More specifically, the distance S from the shank axis O to the cutting edge 5 of the chip 1 in the front view from the shank axis direction of the cutting edge 2 is set to 1.4S or less.
さらに、上記刃先部２には、上記切刃５で生成される
切屑を滞りなく排出させるためのチツプポケツト７が形
成され、このチツプポケツト７の先端側は、上記チツプ
１のすくい面６と略面一とされている。Further, a chip pocket 7 for discharging chips generated by the cutting blade 5 without interruption is formed in the cutting edge portion 2, and a tip side of the chip pocket 7 is substantially flush with the rake face 6 of the chip 1. It has been.
このように構成された中ぐりバイトを用いて被削材の
内径加工、すなわち、被削材にあらかじめ形成された穴
部を拡径するには、まず、シャンク４を図示せぬホルダ
を介して工作機械の工具把持部（例えば、旋盤の心押
台）に装着する一方で、上記被削材を、工作機械のワー
ク把持部（例えば、旋盤のチャック）に、その穴部の軸
線が上記シャンク４の軸線Ｏと平行方向に向くように装
着する。そして、上記被削材をその穴部の軸線周りに回
転させつつ、上記工作機械の工具把持部とワーク把持部
との間に上記シャンク４の軸線方向の相対運動を与えて
上記刃先部２及び首部３を上記被削材の穴部に挿入して
ゆくことにより、チツプ１の切刃５で被削材の穴部を切
削して所定寸法に拡径してゆく。In order to process the inner diameter of a work material using the boring tool configured as described above, that is, to increase the diameter of a hole previously formed in the work material, first, the shank 4 is inserted through a holder (not shown). While the workpiece is mounted on a tool gripper (for example, a tailstock of a lathe) of the machine tool, the work material is placed on a workpiece gripper (for example, a chuck of a lathe) of the machine tool, and the axis of the hole is aligned with the shank. 4 so as to be oriented in a direction parallel to the axis O. Then, while rotating the work material around the axis of the hole, a relative motion in the axial direction of the shank 4 is given between the tool gripping portion and the workpiece gripping portion of the machine tool to provide the cutting edge 2 and By inserting the neck portion 3 into the hole of the work material, the hole of the work material is cut by the cutting blade 5 of the chip 1 to increase the diameter to a predetermined size.
［発明が解決しようとする課題］ ところで、上述した従来の中ぐりバイトを用いた内径
加工においては、中ぐりバイトの刃先部２及び首部３が
工作機械の工具把持部から突出したいわゆる片持ち支持
の状態で切削が行われるため、切削中に、上記刃先部２
から首部３にかけての部分にひびり振動が極めて生じ易
く、このため、切削面の面粗度の劣化や切刃の欠損等の
事故を招き易いという欠点があった。[Problems to be Solved by the Invention] By the way, in the above-described inner diameter machining using the boring tool, the so-called cantilever support in which the cutting edge 2 and the neck 3 of the boring tool protrude from the tool holding portion of the machine tool. The cutting is carried out in the state of
There is a drawback that crack vibration is extremely likely to occur in the portion from to the neck 3, and therefore, accidents such as deterioration of the surface roughness of the cut surface and loss of the cutting edge are likely to occur.
このような欠点を解消せんとして、従来より、首部３
とシャンク４とを超硬合金で一体化して刃先部２とロウ
付けしたり、あるいは首部３の直径ｄ1に比してシャン
ク４の直径ｄ2をなるべく大きく形成するなど、工具剛
性やシャンク４の取付剛性の向上を図ることによってひ
びり振動を押さえ込もうとする試みがなされていた。し
かしながら、これらの手段では、剛性がある一定限度を
超えるともはや剛性を向上させてもびびり振動が期待し
た程減少せず、その効果に一定の限界が存在するという
問題があった。また、超硬合金の多用により原料コスト
が著しく上昇するという欠点もあった。In order to eliminate such disadvantages, conventionally, the neck 3
And the shank 4 are integrated with a cemented carbide and brazed to the cutting edge 2 or the diameter d 2 of the shank 4 is made as large as possible compared to the diameter d 1 of the neck 3. Attempts have been made to suppress cracking vibrations by improving the mounting rigidity of the device. However, these means have a problem that if the stiffness exceeds a certain limit, chatter vibration does not decrease as expected even if the stiffness is improved, and there is a certain limit in its effect. In addition, there is also a drawback that the raw material cost is significantly increased due to heavy use of cemented carbide.
この発明は、このような背景の下になされたもので、
従来とは異なる新規な構造を有した防振性能に優れる中
ぐりバイトを提供することを目的とする。The present invention has been made under such a background,
An object of the present invention is to provide a boring tool having a new structure different from the conventional one and having excellent vibration isolation performance.
［課題を解決するための手段］ 上記課題を解決するために、この発明の中ぐりバイト
は、首部を、シャンク軸線と直交する方向の断面視にお
ける断面積が、該首部の先端から基端に向かうに従って
漸次シャンクの断面視における断面積を下回らない範囲
で減少し、かつ、上記切刃に連なる側の外周部に形成さ
れた逃げ面は、首部の先端から基端に向かうに従って逃
げ面と対向する面よりもシャンク軸線側に漸次近接する
ように形成したことを特徴とする。[Means for Solving the Problems] In order to solve the above problems, the boring tool of the present invention is configured such that a cross-sectional area in a cross-sectional view in a direction orthogonal to a shank axis extends from a distal end to a proximal end of the neck portion. The flank gradually decreases within a range not less than the cross-sectional area in the cross-sectional view of the shank as it goes, and the flank formed on the outer peripheral portion on the side connected to the cutting blade faces the flank as it goes from the tip of the neck to the base end. The shank is formed so as to be gradually closer to the shank axis side than the surface to be formed.
［作用］ 上記構成によれば、首部のシャンク軸線と直交する方
向の断面積が首部の先端から基端に向かうに従って減少
するため、シャンク側の剛性が首部先端側よりも低下
し、全体の構造は、各部の質量、あるいは剛性（換言す
ればバネ定数）に応じて異なる振動が発生し易い柔軟構
造となる。[Operation] According to the above configuration, the cross-sectional area of the neck in the direction orthogonal to the shank axis decreases from the distal end to the proximal end of the neck, so that the rigidity on the shank side is lower than the distal end side of the neck, and the entire structure Has a flexible structure in which different vibrations are likely to occur depending on the mass or rigidity (in other words, spring constant) of each part.
ここにおいて、上記構成によれば首部断面積の変化に
伴って首部各部の質量がシャンクに向かうにつれて減少
するから、切削抵抗の変動に伴って刃先部に生じた振動
は一様に伝達されず、刃先部から首部の基端にかけての
部分には、各部の質量に応じて周波数の異なる振動が生
じる。さらに、首部の切刃部の外周部に、該首部の先端
から基端に向かうに従って逃げ面と対向する面よりもシ
ャンク軸線に漸次近接する逃げ面が設けられているため
に、首部の軸心位置が先端から基端に向かうにつれてシ
ャンク軸線から漸次離間し、このため、振動の伝達方向
もシャンク軸線方向に揃うことなく逐次変化する。この
ため、切削抵抗の変動に伴って刃先部に振動が生じて
も、首部の各部に周波数や位相が異なる振動が生じて互
いに干渉し合うこととなり、この結果、びびり振動の成
長が阻止される。Here, according to the above configuration, since the mass of each part of the neck decreases with the change in the cross-sectional area of the neck toward the shank, the vibration generated at the cutting edge due to the variation of the cutting resistance is not transmitted uniformly, Vibrations having different frequencies are generated in the portion from the cutting edge to the base end of the neck in accordance with the mass of each portion. Further, since the flank is provided on the outer peripheral portion of the cutting edge portion of the neck portion so as to gradually approach the shank axis from the surface facing the flank surface from the distal end to the base end of the neck portion, the axial center of the neck portion is provided. The position is gradually separated from the shank axis as the position moves from the distal end to the proximal end, so that the direction of vibration transmission also changes sequentially without being aligned with the shank axis direction. For this reason, even if vibration occurs in the cutting edge due to the variation of the cutting resistance, vibrations having different frequencies and phases occur in the respective parts of the neck and interfere with each other. As a result, the growth of chatter vibration is prevented. .
加えて、逃げ面を設けたことにより、首部を被削材の
穴部に深く挿入するにつれて、すなわち、加工が進行す
るにつれて、首部外周面の切刃に連なる側と被削材の穴
部内壁との間の隙間が漸次拡大する。このため、切刃か
ら首部外周側に排出される切屑は、上記隙間を介して穴
部から容易に排出されることとなり、この結果、特に加
工深さが深い場合の切屑排出性が向上して切屑詰まりに
よる加工面の損傷や切刃の欠損等の事故が回避される。In addition, by providing the flank, as the neck is inserted deeply into the hole of the work material, that is, as the processing proceeds, the side connected to the cutting edge on the outer peripheral surface of the neck and the inner wall of the hole of the work material Gradually increases. For this reason, chips discharged from the cutting edge to the outer peripheral side of the neck portion are easily discharged from the hole through the gap, and as a result, the chip discharge property is improved particularly when the machining depth is deep. Accidents such as damage to the machined surface and chipping of the cutting edge due to chip clogging are avoided.
［実施例］ 以下、第１図ないし第５図を参照して、本発明の実施
例を説明する。Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.
第１図に示すように、本実施例の中ぐりバイトは、先
端の一側部にチツプ10が装着された刃先部11の基端側
に、首部12及び略円柱状をなすシャンク13が順次形成さ
れてなるものである。As shown in FIG. 1, the boring tool according to the present embodiment has a neck portion 12 and a substantially cylindrical shank 13 at a base end side of a cutting edge portion 11 having a tip 10 attached to one side of a tip end. It is formed.
第１図ないし第３図に示すように、上記チツプ10は、
超硬合金を平面視略菱形をなす板状に成形してなるもの
で、対向する二の角部に形成された切刃14のいずれか一
方が上記刃先部11の先端及び外周から突出された状態
で、かつ、そのすくい面10aに正のすくい角が与えられ
た状態で刃先部11に着脱自在に装着されている。そし
て、上記切刃14の高さは、当該中ぐりバイトの側面視
（第３図）において、上記シャンク13の軸線Ｏとほぼ同
一高さに定められている。As shown in FIGS. 1 to 3, the chip 10
It is formed by forming a cemented carbide into a plate shape having a substantially rhombic shape in a plan view, and one of the cutting blades 14 formed at two opposite corners is projected from the tip and the outer periphery of the cutting edge portion 11. It is detachably attached to the cutting edge portion 11 in a state where the rake face 10a has a positive rake angle. The height of the cutting blade 14 is set to be substantially the same as the axis O of the shank 13 in a side view of the boring tool (FIG. 3).
上記刃先部11は、円柱体の一部に、当該中ぐりバイト
の先端及び上方に向かって開口するチツプポケツト15が
形成されてなるものである。The cutting edge 11 is formed by forming a tip pocket and a tip pocket 15 opening upward on a part of a cylindrical body.
このチツプポケツト15は、上記チツプ10のすくい面10
aに沿って成長する切屑を滞りなく排出するためのもの
である。その壁面は、上記シャンク13の軸線Ｏとほぼ同
一の高さに設定された先端部から刃先部11の基端に向か
うに従って漸次上方に傾斜する傾斜面状に形成されてい
る。また、チツプポケツト15の上記チツプ10後端に臨む
位置には、上記首部12の先端外周面のチツプ10に連なる
側に開口するぬすみ部16が形成され、このぬすみ部16の
底面16aは、上記チツプすくい面10aと略面一に形成され
ている。The chip pocket 15 is a rake face 10 of the chip 10 described above.
It is for discharging the chips growing along a without any interruption. The wall surface is formed in an inclined surface shape that gradually inclines upward from a distal end portion set at substantially the same height as the axis O of the shank 13 toward the base end of the cutting edge portion 11. At a position facing the rear end of the chip 10 of the chip pocket 15, a squeezed portion 16 is formed which opens on the side of the distal end outer surface of the neck portion 12 that is continuous with the chip 10, and the bottom surface 16a of the squeezed portion 16 is It is formed substantially flush with the rake face 10a.
上記首部12は、シャンク軸線Ｏと直交する方向の断面
視における断面積が、該首部12の先端から基端に向かう
に従って漸次シャンク13の上記断面視における断面積を
下回らない範囲で減少する略円柱体であって、そのチツ
プ10に連なる側の外周部に、該首部12の先端から基端に
向かうに従って漸次上記シャンク軸線Ｏに近接する逃げ
面17を有してなるものである。The above-described neck portion 12 has a substantially cylindrical shape in which a cross-sectional area in a cross-sectional view in a direction orthogonal to the shank axis O gradually decreases from the distal end of the neck portion 12 to the proximal end within a range not to be smaller than the cross-sectional area of the shank 13 in the cross-sectional view. The body has a flank 17 on the outer peripheral portion on the side connected to the tip 10, which gradually approaches the shank axis O from the distal end to the proximal end of the neck portion 12.
この首部12先端の上記断面における外周円弧の直径ｄ
1は、切削条件等に応じて適宜定められるが、上記刃先
部11のシャンク軸線方向の正面視におけるシャンク軸線
Ｏから切刃14までの距離Ｓに対して1.6S〜1.9Sの範囲が
好ましい。直径ｄ1が1.6Sに満たないと後述する質量変
化によるびびり振動の回避効果が十分に発揮されないお
それが生じ、他方直径ｄ1が1.9Sを超えると、首部12が
被削材の穴部に挿入された際の首部12の先端外周面と上
記穴部内壁との間の隙間が不足して、上記チツプポケツ
ト15から首部12の周面を経由して排出される切屑の排出
性が悪化するおそれが生じるからである。The diameter d of the outer peripheral arc in the cross section at the tip of the neck 12
1 is appropriately determined according to cutting conditions and the like, but is preferably in the range of 1.6S to 1.9S with respect to the distance S from the shank axis O to the cutting edge 14 in the front view of the cutting edge 11 in the shank axis direction. Resulting possibly avoid effect of chatter vibration by mass change the diameter d 1 is described below with less than 1.6S is not sufficiently exhibited, the other diameter d 1 is greater than 1.9 s, neck 12 into the hole of the workpiece There is a possibility that the clearance between the outer peripheral surface of the distal end of the neck portion 12 and the inner wall of the hole when inserted is insufficient, and the discharge performance of the chips discharged from the chip pocket 15 via the peripheral surface of the neck portion 12 is deteriorated. Is caused.
また、上記逃げ面17は、首部12をシャンク軸線Ｏと斜
めに交差する方向に旋削することによって対向する面よ
りシャンク軸線に漸次近接するように形成されており、
その具体的な形成手順は以下の通りである。Further, the flank 17 is formed so as to gradually approach the shank axis from the opposing surface by turning the neck 12 in a direction obliquely intersecting the shank axis O,
The specific forming procedure is as follows.
すなわち、逃げ面17の形成にあたり、まず第４図
（ａ）に示すように、シャンク13の先端に該シャンク13
よりも大径でかつ同軸の円柱状の首部12aを形成する。
そして、第４図（ｂ）に示すように、首部12aをシャン
ク軸線Ｏと平行な回転軸Ｏ1の周りに回転させつつ、首
部12aの回転軸Ｏ1とシャンク軸線Ｏを挟んで反対側の外
周面にバイトＢを当接させ、このバイトＢを上記回転軸
Ｏ1に対して任意の角度θで交差する方向に送り出す。
これにより、首部12の外周部が、第４図（ｂ）に斜線部
で示すごとくバイトＢの送りに伴って漸次シャンク軸線
Ｏ側に削り込まれて逃げ面17が形成され、同時に断面積
が漸減する首部12が形成される。That is, in forming the flank 17, first, as shown in FIG.
A cylindrical neck portion 12a having a larger diameter and a coaxial shape is formed.
As shown in FIG. 4 (b), while rotating the neck 12a around the shank axis O and parallel to the rotation axis O 1, on the opposite side across the rotation axis O 1 and the shank axis O of the neck 12a the outer peripheral surface is brought into contact with the byte B, sends this byte B in the direction crossing at any angle θ with respect to the rotation axis O 1.
As a result, the outer peripheral portion of the neck portion 12 is gradually cut to the shank axis O side along with the feeding of the cutting tool B as shown by the hatched portion in FIG. A tapering neck 12 is formed.
ここで、上記逃げ面17の稜線17aがシャンク軸線Ｏに
対してなす傾斜角θは、首部12の全長、直径等に応じて
適宜定めて良いが、少なくとも１°以上確保することが
好ましい。傾斜角θが１°に満たないと、後述する軸心
位置の変化が十分でなく、びびり振動の回避効果が損な
われるおそれが生じるからである。また、傾斜角θの設
定にあたっては、首部12の基端における断面積、すなわ
ち、第５図に示すように、首部12のシャンク軸線Ｏと直
交する断面において、首部12の外周面に沿って描いた外
周円弧Ｒで囲まれる部分の面積から、上記旋削加工によ
って除去される部分の面積を差し引いた面積が、シャン
ク13の断面積を下回らない範囲に規制する必要がある。Here, the inclination angle θ formed by the ridge line 17a of the flank 17 with respect to the shank axis O may be appropriately determined according to the overall length, the diameter, and the like of the neck portion 12, but it is preferable to secure at least 1 ° or more. If the inclination angle θ is less than 1 °, the axial center position described below is not sufficiently changed, and the effect of avoiding chatter vibration may be impaired. In setting the inclination angle θ, the cross-sectional area at the base end of the neck 12, that is, as shown in FIG. 5, is drawn along the outer peripheral surface of the neck 12 in a cross section orthogonal to the shank axis O of the neck 12. It is necessary to restrict the area obtained by subtracting the area of the part removed by the above-mentioned turning from the area of the part surrounded by the outer peripheral arc R so as not to be smaller than the sectional area of the shank 13.
また、上記首部12の長さは、切削対象となる被削材の
穴部の軸方向の長さに応じて適宜定められるが、上記切
刃14の先端から首部12の基端までのシャンク軸線方向に
おける距離ｌが、上記距離Ｓに対して6S〜10Sの範囲と
なるように定めることが好ましい。距離ｌが6Sに満たな
いと全体を柔軟構造としたことによる防振効果が十分に
発揮されないおそれが生じ、他方、距離ｌが10Sを超え
ると首部12の切削抵抗による静的撓みが大きくなり過ぎ
て加工精度が劣化するおそれが生じるからである。The length of the neck 12 is appropriately determined according to the axial length of the hole of the work material to be cut, but the shank axis from the distal end of the cutting blade 14 to the base end of the neck 12 It is preferable that the distance 1 in the direction is set to be in the range of 6S to 10S with respect to the distance S. If the distance 1 is less than 6S, the vibration damping effect due to the entire flexible structure may not be sufficiently exerted. On the other hand, if the distance 1 exceeds 10S, the static deflection due to the cutting resistance of the neck 12 becomes too large. This is because processing accuracy may be deteriorated.
そして、上記シャンク13は、円柱体の外周面に、当該
シャンク13の軸方向ほぼ全長に渡って延びる切欠部18を
形成してなるもので、図示せぬホルダに嵌装されて工作
機械の工具把持部に装着されるようになっている。The shank 13 is formed by forming a cutout portion 18 extending over substantially the entire axial direction of the shank 13 on the outer peripheral surface of the cylindrical body. It is designed to be mounted on the grip.
以上のように構成された中ぐりバイトを用いて被削材
の内径加工を行うには、上述した従来の中ぐりバイトと
同様に、上記シャンク13をホルダを介して工作機械の工
具把持部に装着し、この後、工作機械のワーク把持部に
把持された被削材をその穴部の軸線周りに回転させつ
つ、上記工作機械の工具把持部とワーク把持部との間に
上記シャンク13の軸線方向の相対運動を与えて上記刃先
11及び首部12を上記被削材の穴部に挿入してゆくことに
より、チツプ10の切刃14で被削材の穴部を切削して所定
寸法に拡径してゆく。In order to perform the inner diameter machining of the work material using the boring tool configured as described above, similarly to the above-described conventional boring tool, the shank 13 is attached to the tool holding portion of the machine tool via the holder. The work material gripped by the workpiece gripper of the machine tool is rotated around the axis of the hole, and the shank 13 is inserted between the tool gripper and the workpiece gripper of the machine tool. Give relative motion in the axial direction to
By inserting the neck 11 and the neck 12 into the hole of the work material, the hole of the work material is cut by the cutting blade 14 of the chip 10 to increase the diameter to a predetermined size.
このとき、刃先部11には、上記チツプ10の切刃14と被
削材との間にかかる切削抵抗の変動に伴って振動が発生
する。この場合、上述した従来の中ぐりバイトのように
全体の剛性が高いものでは、全体が一つの剛体として振
動するため、切削抵抗の変動に起因する振動が刃先部11
から首部12を介してシャンク13まで一様に伝達されて、
中ぐりバイトにおける上記工作機械の工具把持部から突
き出された部分、すなわち、上記刃先部11から首部12に
かけての部分（以下、突き出し部分と略称する。）にび
びり振動が生じる。At this time, vibration is generated in the cutting edge 11 due to a change in cutting resistance applied between the cutting blade 14 of the chip 10 and the work material. In this case, in the case of the above-described conventional boring tool having a high overall rigidity, the whole vibrates as a single rigid body, so that the vibration caused by the fluctuation of the cutting resistance causes the cutting edge 11
From the neck 12 to the shank 13,
Chatter vibration occurs in a portion of the boring tool protruding from the tool holding portion of the machine tool, that is, a portion (hereinafter, abbreviated as a protruding portion) from the cutting edge 11 to the neck 12.
ところが、本実施例の中ぐりバイトにおいては、首部
12の外周部に逃げ面17を形成することにより、首部12の
シャンク軸線Ｏと直交する方向の断面積を首部12の先端
から基端に向かうに従って減少させているため、シャン
ク13側の剛性が首部12の先端側よりも低下し、全体の構
造は、各部の質量、あるいは剛性（換言すればバネ定
数）に応じて異なる振動が発生し易い柔軟構造となる。However, in the boring tool of this embodiment, the neck
Since the flank 17 is formed on the outer periphery of the neck 12, the cross-sectional area of the neck 12 in the direction orthogonal to the shank axis O is reduced from the tip of the neck 12 toward the base end, so that the rigidity of the shank 13 is reduced. The overall structure is a flexible structure in which different vibrations are likely to occur depending on the mass or rigidity (in other words, the spring constant) of each part.
しかも、本実施例の中ぐりバイトでは、首部12の断面
積の変化に伴って首部12各部の質量がシャンク13に向か
うにつれて漸次減少するから、刃先部11に生じた振動は
一様に伝達されず、刃先部11から首部12の基端にかけて
の部分に、各部の質量に応じて周波数の異なる振動が生
じる。さらに、本実施例の中ぐりバイトでは、逃げ面17
を形成したことにより、首部12の軸心が当該首部12の先
端から基端に向かうにつれてシャンク軸線Ｏから漸次離
間してゆくため、振動の伝達方向のシャンク軸線Ｏの方
向に揃うことなく逐次変化する。このため、切削抵抗の
変動に伴って刃先部11に振動が生じても、首部12の各部
に周波数や位相が異なる振動が生じて互いに干渉し合う
こととなり、この結果、びびり振動の成長が阻止される
のである。Moreover, in the boring tool according to the present embodiment, since the mass of each part of the neck 12 gradually decreases toward the shank 13 as the cross-sectional area of the neck 12 changes, the vibration generated at the cutting edge 11 is transmitted uniformly. Instead, vibrations having different frequencies are generated in a portion from the blade edge portion 11 to the base end of the neck portion 12 according to the mass of each portion. Further, in the boring tool of the present embodiment, the flank 17
Is formed, the axial center of the neck portion 12 is gradually separated from the shank axis O as it goes from the distal end to the proximal end of the neck portion 12, so that the vibration transmission direction changes successively without being aligned with the direction of the shank axis O. I do. Therefore, even if the cutting edge 11 vibrates due to the variation of the cutting force, vibrations having different frequencies and phases occur in the respective parts of the neck 12 and interfere with each other, thereby preventing the growth of chatter vibration. It is done.
加えて、本実施例によれば首部12の外周面のうちでチ
ツプ10に連なる側に逃げ面17が形成されているため、首
部12を被削材の穴部に深く挿入するにつれて、すなわ
ち、加工が進行するにつれて、首部12外周面のチツプ10
に連なる側と被削材の穴部内壁との間の隙間が漸次拡大
する。In addition, according to the present embodiment, since the flank 17 is formed on the side of the outer peripheral surface of the neck 12 that is continuous with the chip 10, as the neck 12 is inserted deeper into the hole of the work material, As the processing progresses, the tip 10 on the outer peripheral surface of the neck 12
The gap between the side connected to the hole and the inner wall of the hole of the work material gradually increases.
このため、チツプポケツト15のぬすみ部16を介して首
部12の外周側に排出される切屑は、上記隙間を介して穴
部から容易に排出されることとなり、この結果、特に加
工深さが深い場合の切屑排出性が向上して切屑詰まりに
よる加工面の損傷や切刃14の欠損等の事故が回避され、
上述のびびり振動回避効果と相まって、常に良好な仕上
げ面を得ることができる。For this reason, chips discharged to the outer peripheral side of the neck portion 12 through the slack portion 16 of the chip pocket 15 are easily discharged from the hole portion through the gap, and as a result, particularly when the processing depth is deep, The chip discharge performance is improved, and accidents such as damage to the machined surface due to chip clogging and chipping of the cutting edge 14 are avoided.
In combination with the above-described chatter vibration avoiding effect, a good finished surface can always be obtained.
なお、以上の実施例においては、特にチツプ10を着脱
自在に装着しているが、本発明はこれに限るものではな
く、ロウ付けによるもの、あるいは切刃からシャンクま
でをすべて一体成形するものであっても当然に適用され
るものである。In the above embodiment, the chip 10 is particularly removably mounted. However, the present invention is not limited to this, and all the parts from the cutting blade to the shank are integrally formed by brazing. Even if there is, it is naturally applied.
また、上述した逃げ面17の形成手順もあくまで一例を
示すものであり、これに限定されるものではない。例え
ば、第６図（ａ）に示すように、シャンク13の先端側
に、シャンク13から離間するにつれて拡径するテーパ軸
状の首部12aを形成し、ついで第６図（ｂ）に示すよう
に、首部12aをシャンク軸線Ｏと平行な回転軸Ｏ2の回り
に回転させつつ、首部12aの回転軸Ｏ2とシャンク軸線Ｏ
を挟んで反対側の周面にバイトＢを切り込む。そして、
バイトＢをシャンク軸線Ｏと平行に送り出すことによ
り、第６図（ｂ）に斜線部で示すごとく首部12aの外周
部が削り込まれ、シャンク軸線Ｏよりも回転軸Ｏ2側に
位置する外周部に逃げ面17が形成される。Further, the procedure for forming the flank 17 described above is merely an example, and the present invention is not limited to this. For example, as shown in FIG. 6 (a), a tapered shaft-shaped neck portion 12a whose diameter increases as the distance from the shank 13 increases is formed on the tip side of the shank 13, and then as shown in FIG. 6 (b). , while rotating the neck 12a around the shank axis O and parallel to the rotation axis O 2, the rotation axis O 2 and the shank axis of the neck 12a O
A cutting tool B is cut into the peripheral surface on the opposite side with the. And
By feeding the byte B parallel to the shank axis O, FIG. 6 (b) to be incorporated sharpener outer peripheral portion of the neck portion 12a as shown by a hatched portion, the outer peripheral portion than the shank axis O located on the rotation axis O 2 side A flank 17 is formed at the bottom.
さらに、刃先部11のチツプポケツト15の形状につれて
も、上記実施例のものに限るものではない。以下、その
変形例を第７図ないし第９図を参照して説明する。Further, the shape of the tip pocket 15 of the cutting edge 11 is not limited to the above embodiment. Hereinafter, a modification thereof will be described with reference to FIGS. 7 to 9.
第７図ないし第９図に示す変形例は、上記刃先部11の
先端から首部12の先端にかけての部分を、当該中ぐりバ
イトの平面視（第７図）における刃先部11の先端面とシ
ャンク軸線Ｏとの交差位置の近傍から首部12先端外周面
のチツプ10に連なる側に向かって、シャンク軸線Ｏと交
差する方向に切り欠いてチツプポケツト20を形成したも
のである。7 to 9, a portion from the tip of the cutting edge portion 11 to the tip of the neck portion 12 is formed by shaving the tip face of the cutting edge portion 11 in a plan view (FIG. 7) of the boring tool. A chip pocket 20 is formed by notching in a direction intersecting with the shank axis O from the vicinity of the intersection with the axis O to the side connected to the chip 10 on the tip outer peripheral surface of the neck portion 12.
このチツプポケツト20は、上記チツプすくい面10aと
略面一をなす平坦な底面21と、当該中ぐりバイトを平面
視したときにシャンク軸線Ｏと交差する方向に延在する
壁面22とからなるものである。The chip pocket 20 has a flat bottom surface 21 substantially flush with the chip rake surface 10a, and a wall surface 22 extending in a direction intersecting the shank axis O when the boring tool is viewed in plan. is there.
ここで、上記壁面22の刃先部11先端面における稜線と
底面21との交点Ｐ1と、上記切刃14との工具径方向にお
ける距離ｌ1は、上記距離Ｓに対して1.3Sを超えない範
囲に定められている。距離ｌ1が1.3Sを超えると、刃先
部11先端の肉厚が不足して、後述する剛性向上効果が損
なわれるおそれが生じるからである。Here, the intersection point P 1 between the ridge line and the bottom surface 21 at the tip end surface of the cutting edge 11 of the wall surface 22 and the distance l 1 between the cutting edge 14 and the cutting edge 14 in the tool radial direction do not exceed 1.3 S with respect to the distance S. The range is determined. When the distance l 1 is more than 1.3S, insufficient thickness of the cutting edge 11 tip, because fear of impairing the rigidity improvement effect described below may occur.
また、上記壁面22の延在方向が上記シャンク軸線Ｏに
対してなす傾斜角αは15°〜45°の薄肉に定められてい
る。これは、傾斜角αが15°に満たないとチツプポケツ
ト20のシャンク軸線方向における長さが長くなり過ぎて
首部12の剛性が過度に損なわれるおそれが生じ、他方傾
斜角αが45°を超えると、チツプすくい面10aに沿って
成長する切屑の成長方向と壁面22の延在方向と交わる角
度が大き過ぎて、首部12の外周側に切屑を円滑に案内で
きないおそれが生じるからである。In addition, the inclination angle α formed by the extending direction of the wall surface 22 with respect to the shank axis O is set to a small thickness of 15 ° to 45 °. If the inclination angle α is less than 15 °, the length of the tip pocket 20 in the axial direction of the shank becomes too long, and the rigidity of the neck 12 may be excessively impaired.On the other hand, if the inclination angle α exceeds 45 °, This is because the angle at which the growth direction of the chip growing along the chip rake face 10a intersects with the extending direction of the wall surface 22 is too large, and the chip may not be smoothly guided to the outer peripheral side of the neck portion 12.
さらに、チツプポケツト２の上記壁面22の延在方向と
直交する断面視における底面21と壁面22とのなす角βは
90°〜120°の範囲に定められている。角度βが90度に
満たないとチツプポケツト20の体積が不足して切屑の排
出性が劣化するおそれが生じ、他方角度βが120°を超
えると刃先部11先端の肉厚が不足して刃先部11の剛性が
過度に損なわれるおそれが生じるからである。Further, an angle β formed between the bottom surface 21 and the wall surface 22 in a cross-sectional view orthogonal to the extending direction of the wall surface 22 of the chip pocket 2 is
It is set in the range of 90 ° to 120 °. If the angle β is less than 90 degrees, the volume of the chip pocket 20 is insufficient, and there is a risk that the chip discharge performance is deteriorated. On the other hand, if the angle β exceeds 120 °, the thickness of the tip of the blade This is because the rigidity of 11 may be excessively impaired.
このようなチツプポケツト20によれば、チツプすくい
面10aで生成される切屑が壁部22に案内されて逐次逃げ
面17側に排出されるので、上記実施例と比較して切屑排
出性がより一層改善されて切削能率が向上する。According to such a chip pocket 20, the chips generated on the chip rake face 10a are guided by the wall portion 22 and are sequentially discharged to the flank 17 side, so that the chip discharge property is further improved as compared with the above embodiment. It is improved and cutting efficiency is improved.
加えて、本変形例によれば、刃先部11のチツプ10と反
対側の部分が切り欠かれずにリブ状に残されるので、刃
先部11の先端を径方向全長に渡って切り欠いている上記
実施例のチツプポケツト15と比較して刃先部11の断面積
が増大して刃先部11の剛性が増大する。このため、刃先
14にかかる切削抵抗に伴う刃先部11の変形が減少し、こ
の結果、切刃14の高さの変化が小さくなって加工精度が
向上するという効果を奏する。In addition, according to the present modification, the portion of the cutting edge 11 opposite to the chip 10 is left in a rib shape without being cut, so that the tip of the cutting edge 11 is notched over the entire radial length. Compared with the tip pocket 15 of the embodiment, the cross-sectional area of the cutting edge 11 is increased and the rigidity of the cutting edge 11 is increased. For this reason, the cutting edge
The deformation of the cutting edge 11 due to the cutting force applied to the cutting edge 14 is reduced, and as a result, the change in the height of the cutting edge 14 is reduced and the processing accuracy is improved.
［実験例］ 次に、実験例を挙げて本発明の効果を明らかにする。[Experimental Example] Next, the effect of the present invention will be clarified with an experimental example.
実験例……上記実施例の中ぐりバイトを用意し、これ
を第10図に示すようにホルダｈを介して旋盤に装着して
被削材Ｗの穴部Ｈの内径加工を行った。Experimental Example A boring tool of the above embodiment was prepared, and this was mounted on a lathe via a holder h as shown in FIG. 10, and the inner diameter of the hole H of the workpiece W was processed.
このとき、ホルダｈ端面から切刃14までの突出量Ｌと
シャンク径Ｄ（第１図におけるｄ2）との比L/Dを３通り
変化させ、各々の場合について、びびり音の音圧レベ
ル、仕上げ面の面粗度、真円度の測定と、仕上げ面の目
視評価を行った。この結果を第１表に示す。At this time, the ratio L / D of the protrusion amount L from the end face of the holder h to the cutting edge 14 and the shank diameter D (d 2 in FIG. 1) is changed in three ways, and in each case, the sound pressure level of the chatter sound is changed. The surface roughness and roundness of the finished surface were measured, and the finished surface was visually evaluated. Table 1 shows the results.
比較例……第14図ないし第16図に示す従来の中ぐりバ
イトを用意し、旋盤に装着して内径加工を行った。この
とき、実験例と同様に、突出量Ｌとシャンク径Ｄとの比
L/Dを３通り変化させ、それぞれについてびびり音の音
圧レベル、仕上げ面の面粗度、真円度の測定と、仕上げ
面の目視評価を行った。この結果を第１表に示す。Comparative Example: A conventional boring tool shown in FIGS. 14 to 16 was prepared and mounted on a lathe to perform inner diameter processing. At this time, as in the experimental example, the ratio between the protrusion amount L and the shank diameter D was determined.
The L / D was changed in three ways, and the sound pressure level of chattering sound, the surface roughness and roundness of the finished surface were measured, and the finished surface was visually evaluated. Table 1 shows the results.
なお、上記実験例及び比較例においてびびり音の音圧
レベルの測定周波数は4kHzに設定した。これは、通常の
切削条件で中ぐり加工を行ったとき、4kHz近傍のびびり
音が生じることが多いためである。In the experimental example and the comparative example, the measurement frequency of the sound pressure level of chatter was set to 4 kHz. This is because when boring is performed under normal cutting conditions, a chatter sound near 4 kHz often occurs.
また、実験例および比較例における上記L/Dの値は、
第１表に示すように設定した。さらに、実験例および比
較例における中ぐりバイトの各部寸法、被削材の材質及
び寸法、切削条件等は以下に示す通りである。The values of L / D in the experimental examples and comparative examples are as follows:
The settings were as shown in Table 1. Further, the dimensions of each part of the boring tool, the material and dimensions of the work material, the cutting conditions, and the like in the experimental example and the comparative example are as follows.
・ シャンク軸線から切刃までの距離Ｓ …実験例 8mm …比較例 8mm ・ 首部先端の直径ｄ0 …実験例 14.5mm …比較例 11.5mm ・ シャンク直径ｄ2 …実験例 12mm …比較例 12mm ・ 被削材の穴径Ｄw……18mm ・ 被削材の穴深さｄw……20mm ・ 被削材材質……SCM440（硬度ＨRC28） ・ 送り速度……70m/min. ・ 送り量……0.1mm/rev. ・ 切り込み量ａ……0.5mm 第１表から明らかなように、本発明の中ぐりバイトに
よれば、従来の中ぐりバイトよりもびびり振動の発生が
効果的に抑制されるので、切削中のびびり音が減少し、
また仕上げ面の面粗度、真円度が向上することが確認さ
れた。・ Distance S from shank axis to cutting edge ・ ・ ・ Experimental example 8mm ・ ・ ・ Comparative example 8mm ・ Diameter of neck tip d 0・ ・ ・ Experimental example 14.5mm ・ ・ ・ Comparative example 11.5mm ・ Shank diameter d 2・ ・ ・ Experimental example 12mm… Comparative example 12mm ・ Coated Workpiece hole diameter D w …… 18mm ・ Workpiece hole depth d w …… 20mm ・ Workpiece material …… SCM440 (hardness H R C28) ・ Feed speed …… 70m / min. … 0.1mm / rev. ・ Cutting depth a …… 0.5mm As is clear from Table 1, according to the boring tool of the present invention, the occurrence of chatter vibration is more effectively suppressed than in the conventional boring tool, so that chattering noise during cutting is reduced,
It was also confirmed that the surface roughness and roundness of the finished surface were improved.
［発明の効果］ 以上説明したように、この発明によれば、首部の断面
積がシャンク軸線方向において漸次変化し、さらには基
部の軸心位置もシャンク軸線に対して漸次変位するの
で、切削抵抗の変動に起因して刃先部に生じる振動が首
部を介してシャンクまで伝達される間に多用に変化して
首部の各部に周波数や位相が異なる振動が生じ、これら
の振動が互いに打ち消し合ってびびり振動の発生が効果
的に抑制される。[Effects of the Invention] As described above, according to the present invention, the cross-sectional area of the neck gradually changes in the shank axis direction, and further, the axial center position of the base also gradually displaces with respect to the shank axis. The vibrations generated at the cutting edge due to the fluctuations of the cutting edge change frequently during the transmission to the shank via the neck, causing vibrations with different frequencies and phases at each part of the neck, and these vibrations cancel each other out and chatter. Generation of vibration is effectively suppressed.
加えて、本発明の中ぐりバイトによれば、加工の進行
に伴って首部外周の逃げ面と被削材の穴部内壁との隙間
が漸次拡大するため、加工深さが増加しても切屑の排出
性が劣化しない。このため、切屑詰まりに伴う加工面の
損傷や切刃の欠損が回避され、上述のびびり振動回避効
果と相まって、常に良好な仕上げ面が得られるという優
れた効果を奏する。In addition, according to the boring tool of the present invention, the gap between the flank of the outer periphery of the neck and the inner wall of the hole of the work material gradually increases with the progress of processing, so that even when the processing depth increases, Does not deteriorate. Therefore, damage to the machined surface due to clogging of chips and loss of the cutting edge are avoided, and in combination with the above-described chatter vibration avoiding effect, an excellent effect that a good finished surface is always obtained can be obtained.
第１図ないし第５図は本発明の一実施例を示すもので、
第１図は平面図、第２図は第１図におけるＩ矢視図、第
３図は第１図におけるII矢視図、第４図（ａ）、（ｂ）
は逃げ面の形成手順を示す図、第５図は第１図中III-II
I線における断面図、 第６図（ａ）、（ｂ）は逃げ面の形成手順の変形例を示
す図、 第７図ないし第９図は上記実施例の変形例を示す図で、
第７図は平面図、第８図は側面図、第９図は第７図中IV
-IV線における断面図、 第10図は実験例における切削形態を示す図、 第11図ないし第13図は従来例を示す図で、第11図はその
平面図、第12図はその正面図、第13図はその側面図、 第14図ないし第16図は他の従来例を示す図で、第14図は
その平面図、第15図はその正面図、第16図はその側面図
である。 10……スローアウエイチツプ、11……刃先部、12……首
部、13……シャンク、14……切刃、17……逃げ面。1 to 5 show an embodiment of the present invention.
1 is a plan view, FIG. 2 is a view as viewed from the direction of the arrow I in FIG. 1, FIG. 3 is a view as viewed from the direction of the arrow II in FIG. 1, and FIGS.
Is a view showing a procedure for forming a flank, and FIG. 5 is a view showing III-II in FIG.
6 (a) and 6 (b) are views showing a modification of the procedure for forming the flank, and FIGS. 7 to 9 are views showing a modification of the above embodiment.
7 is a plan view, FIG. 8 is a side view, and FIG. 9 is IV in FIG.
FIG. 10 is a view showing a cutting form in an experimental example, FIGS. 11 to 13 are views showing a conventional example, FIG. 11 is a plan view thereof, and FIG. 12 is a front view thereof. FIG. 13 is a side view thereof, FIGS. 14 to 16 are diagrams showing other conventional examples, FIG. 14 is a plan view thereof, FIG. 15 is a front view thereof, and FIG. 16 is a side view thereof. is there. 10 ... throw-away tip, 11 ... cutting edge, 12 ... neck, 13 ... shank, 14 ... cutting blade, 17 ... flank.
Claims (1)
基端側に軸状の首部が形成され、この首部の基端側に軸
状をなすシャンクが形成されてなる中ぐりバイトにおい
て、 上記首部を、上記シャンク軸線と直交する方向の断面視
における断面積が、該首部の先端から基端に向かうに従
って漸次上記シャンクの上記断面視における断面積を下
回らない範囲で減少し、かつ、上記切刃に連なる側の外
周部に形成された逃げ面は、上記首部の先端から基端に
向かうに従って上記逃げ面と対向する面よりも上記シャ
ンク軸線側に漸次近接するように形成したことを特徴と
する中ぐりバイト。An axial shank is formed on the base end of a cutting edge provided with a cutting blade on one side of the tip, and an axial shank is formed on the base end of the neck. In the boring tool, the cross section of the neck portion in a cross section in a direction perpendicular to the axis of the shank is gradually reduced as the cross section in the cross section of the shank in the direction perpendicular to the shank axis line does not fall below the cross section of the shank in the cross section. And, the flank formed on the outer peripheral portion on the side connected to the cutting blade is formed so as to be gradually closer to the shank axis side than a surface facing the flank from the tip of the neck toward the base end. A boring byte characterized by doing.
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1163302A JP2712580B2 (en) | 1989-06-26 | 1989-06-26 | Boring byte |
| KR1019900007267A KR950013214B1 (en) | 1989-06-26 | 1990-05-21 | Boring bar tool |
| DE69028998T DE69028998T2 (en) | 1989-06-26 | 1990-06-26 | Boring bar tool |
| EP90112122A EP0405443B1 (en) | 1989-06-26 | 1990-06-26 | Boring bar tool |
| US07/544,176 US5156503A (en) | 1989-06-26 | 1990-06-26 | Boring bar tool |
| DE69013411T DE69013411T2 (en) | 1989-06-26 | 1990-06-26 | Rod for drilling. |
| EP94104604A EP0609908B1 (en) | 1989-06-26 | 1990-06-26 | Boring bar tool |
| US07/917,189 US5261767A (en) | 1989-06-26 | 1992-07-22 | Boring bar tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1163302A JP2712580B2 (en) | 1989-06-26 | 1989-06-26 | Boring byte |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0332505A JPH0332505A (en) | 1991-02-13 |
| JP2712580B2 true JP2712580B2 (en) | 1998-02-16 |
Family
ID=15771246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1163302A Expired - Fee Related JP2712580B2 (en) | 1989-06-26 | 1989-06-26 | Boring byte |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2712580B2 (en) |
| KR (1) | KR950013214B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011121780A1 (en) | 2010-03-31 | 2011-10-06 | 株式会社タンガロイ | Cutting insert and cutting tool |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2516244Y2 (en) * | 1991-10-07 | 1996-11-06 | 大一工具株式会社 | Hole cutting tool |
| CN201168796Y (en) * | 2008-02-04 | 2008-12-24 | 映钒企业有限公司 | Combined type lathe cutter structure |
| KR102011562B1 (en) | 2017-06-29 | 2019-08-14 | 정대영 | Magnetic fishing equipment |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6181804U (en) * | 1984-11-01 | 1986-05-30 | ||
| JPS62161903U (en) * | 1986-04-03 | 1987-10-15 |
-
1989
- 1989-06-26 JP JP1163302A patent/JP2712580B2/en not_active Expired - Fee Related
-
1990
- 1990-05-21 KR KR1019900007267A patent/KR950013214B1/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011121780A1 (en) | 2010-03-31 | 2011-10-06 | 株式会社タンガロイ | Cutting insert and cutting tool |
| US8967921B2 (en) | 2010-03-31 | 2015-03-03 | Tungaloy Corporation | Cutting insert and cutting tool |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0332505A (en) | 1991-02-13 |
| KR910000279A (en) | 1991-01-29 |
| KR950013214B1 (en) | 1995-10-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109070239B (en) | Small-diameter drill bit | |
| JP4540764B2 (en) | Cutting tools | |
| US11766266B2 (en) | Oscillating surgical cutting tool | |
| EP0405443B1 (en) | Boring bar tool | |
| JP2723768B2 (en) | Ball end mill | |
| JP2712580B2 (en) | Boring byte | |
| JP4385519B2 (en) | Cutting tools | |
| JP3639227B2 (en) | Drilling tools for brittle materials | |
| US5261767A (en) | Boring bar tool | |
| JP2003291003A (en) | Cutting tool | |
| JPS6393511A (en) | Throwaway type rotary cutting tool | |
| KR950009951B1 (en) | Borring bar tool | |
| JPH0332504A (en) | Boring tool | |
| JPH0524218U (en) | Drilling tool | |
| JP3188415B2 (en) | Reamer and hole finishing method using the same | |
| JP2004314258A (en) | Throw-away type drilling tool | |
| KR950013213B1 (en) | Boring bar tool | |
| JP2559865Y2 (en) | Indexable inserts | |
| JPH11320217A (en) | Throwaway tip for machining inside diameter | |
| JP2002283119A (en) | Throwaway tip for ball end mill | |
| JP4155364B2 (en) | Throw-away milling tool for vertical feed | |
| JP4055141B2 (en) | Drills, throwaway drills and throwaway tips | |
| JPH0351059Y2 (en) | ||
| JPS6147645B2 (en) | ||
| JP2001259904A (en) | Throwaway tip |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |