JPH0332507A - Boring tool - Google Patents
Boring toolInfo
- Publication number
- JPH0332507A JPH0332507A JP1163304A JP16330489A JPH0332507A JP H0332507 A JPH0332507 A JP H0332507A JP 1163304 A JP1163304 A JP 1163304A JP 16330489 A JP16330489 A JP 16330489A JP H0332507 A JPH0332507 A JP H0332507A
- Authority
- JP
- Japan
- Prior art keywords
- cutting edge
- tool
- tip
- blade
- chip pocket
- 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.)
- Pending
Links
- 230000002093 peripheral effect Effects 0.000 claims description 9
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000003754 machining Methods 0.000 description 10
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
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)
Abstract
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リバイトに関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a boring rebit used when machining the inner diameter of a workpiece in turning processing.
[従来の技術]
従来、この種の中ぐリバイトとしては、例えば、第6図
ないし第8図に示すように、刃先部l、首部2及びシャ
ンク3が順次形成されてなる略円柱状の工具本体4の先
端−側部に、スcy −”’j’ウェイチップ(以下、
チップと略称する。)5か装行されてなるものが知られ
ている。[Prior Art] Conventionally, as shown in FIGS. 6 to 8, this type of boring rebiting tool has been manufactured using a substantially cylindrical tool in which a cutting edge portion 1, a neck portion 2, and a shank 3 are sequentially formed. A scy-”'j'-way tip (hereinafter referred to as
It is abbreviated as chip. ) 5 is known.
ここで、上記チップ5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6のいずれか一方が
上記刃先部lの先端及び外周面から僅かに突出された状
態で上記刃先部1に着脱自在に装着されている。Here, the chip 5 has a substantially rhombic shape in plan view,
Either one of the cutting edges 6 formed at the two opposing corners is removably attached to the cutting edge part 1 in a state that slightly protrudes from the tip and outer peripheral surface of the cutting edge part l.
また、上記刃先部lには、当該中ぐリバ・イトの先端及
び外周面に開口するチップポケット7が形成されている
。このチップポケット7は、チップすくい面5aと路面
−をなす平坦なすくい面8と、このすくい面8の後端か
ら刃先部lの基端側に向かうに従って漸次刃先部1の上
部外周面へ向1すて傾斜する傾斜面9とを有してなるも
のである。Further, a chip pocket 7 is formed in the cutting edge portion l, which opens at the tip and outer peripheral surface of the boring tool. This chip pocket 7 has a flat rake face 8 which forms a road surface with the chip rake face 5a, and a flat rake face 8 which gradually extends toward the upper outer circumferential surface of the cutting edge 1 as it goes from the rear end of the rake face 8 toward the proximal end of the cutting edge l. 1 and an inclined surface 9 which is inclined all the way.
このように構成されtこ中ぐりバイトを用いて彼削材の
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3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3の軸線Oと平行方向を向くように装着
する。In order to process the inner diameter of a material to be machined using the thus configured boring tool, that is, to enlarge the diameter of a hole previously formed in the workpiece, first, the shank 3 is moved through a holder (not shown). While attaching the workpiece to the tool gripping part of the machine tool (for example, the tailstock of a lathe), the workpiece is attached to the workpiece gripping part of the machine tool (for example, the chuck of a lathe) so that the axis of the hole is above the Attach it so that it faces parallel to the axis O of the shank 3.
そして、上記被削材をその穴部の軸線回りに回転させつ
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3の軸線方向の相対運動を与えて上記刃先
部l及び首部2を上記被削材の穴部に挿入してゆくこと
により、チップ5の切刃6で被削材の穴部を切削して所
定寸法に拡径してゆく。Then, while rotating the work material around the axis of the hole, a relative movement in the axial direction of the shank 3 is applied between the tool gripping part and the workpiece gripping part of the machine tool, so that the cutting edge part l and By inserting the neck portion 2 into the hole of the workpiece, the cutting edge 6 of the tip 5 cuts the hole of the workpiece to enlarge the diameter to a predetermined size.
このとき、チップ5の切刃6で生成された切屑は、チッ
プすくい面5aからチップポケット7のすくい面8へと
排出される。そして、傾斜面9に沿って首部2の外周側
へ案内されて、さらには首部2の外周面と被削材の穴部
内壁との間の隙間を介して中ぐりバイトの基端側へと排
出される。At this time, chips generated by the cutting edge 6 of the chip 5 are discharged from the chip rake face 5a to the rake face 8 of the chip pocket 7. Then, it is guided to the outer peripheral side of the neck part 2 along the inclined surface 9, and further to the base end side of the boring tool through the gap between the outer peripheral surface of the neck part 2 and the inner wall of the hole of the workpiece. be discharged.
[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においては、刃
先部1の先端部を径方向全長に渡って切り欠いてチップ
ポケット7のすくい面8を形成しているため、首部2や
シャンク3に比して刃先部lの剛性が相当に低い。この
ため、刃先部1が切削抵抗によって容易に変形して切刃
6の高さが変化し、これに伴って加工される穴部内径等
が変化して加工精度が悪化するという欠点があった。[Problems to be Solved by the Invention] By the way, in the conventional boring tool described above, the cutting surface 8 of the chip pocket 7 is formed by cutting the tip of the cutting edge portion 1 over the entire length in the radial direction. , the rigidity of the cutting edge portion l is considerably lower than that of the neck portion 2 and the shank 3. As a result, the cutting edge 1 is easily deformed by the cutting resistance, changing the height of the cutting edge 6, which causes the inner diameter of the hole to be machined to change, resulting in poor machining accuracy. .
この発明は、このような背景の下になされたもので、工
具先端の剛性が高くて良好な加工精度を実現できる中ぐ
リバイトを提供することを目的とする。The present invention was made against this background, and an object of the present invention is to provide a boring rebiter that has a high rigidity at the tip of the tool and can realize good machining accuracy.
[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
、上記チップポケットを、その切刃に連なる壁面と直交
する方向から平面視した状態において、上記先端逃げ面
の上記切刃に対して径方向反対側に位置する端部よりも
上記切刃ff1l+の位置から、工具本体外周面の上記
切刃に連なる側部に至る溝状に形成したものである。[Means for Solving the Problems] In order to solve the above problems, the boring tool of the present invention has the above-mentioned tip relief when the above-mentioned chip pocket is viewed from above in a direction perpendicular to the wall surface continuous to the cutting edge. It is formed in a groove shape from the position of the cutting edge ff1l+ beyond the end located on the radially opposite side to the cutting edge of the surface to the side part of the outer circumferential surface of the tool body that is continuous with the cutting edge.
[作用]
上記構成によれば、チップポケットが先端逃げ面の途中
から工具外周面の切刃に連なる測へと延在するため、工
具本体の先端部分は、従来のチップポケットのように径
方向全長に渡って切り欠かれず、チップポケットの背後
、すなわち工具本体先端の切刃に対して径方向反対側に
位置する部分がリブ状に残る。このため、工具先端の剛
性が向上して切削抵抗による工具先端の変形量が減少す
る。[Function] According to the above configuration, the chip pocket extends from the middle of the tip flank to the groove on the outer peripheral surface of the tool that is connected to the cutting edge. The entire length is not cut, and a rib-like portion remains behind the chip pocket, that is, a portion located on the opposite side in the radial direction to the cutting edge at the tip of the tool body. Therefore, the rigidity of the tool tip is improved and the amount of deformation of the tool tip due to cutting resistance is reduced.
[実施例]
以下、第1図ないし第4図を参照して、本発明の詳細な
説明する。[Example] The present invention will be described in detail below with reference to FIGS. 1 to 4.
第1図に示すように、本実施例の中ぐりバイトは、刃先
部IO1首部it及びシャンク12とで構成される略円
柱状の工具本体13の先端−側部に、チップ14が装着
されてなるものである。As shown in FIG. 1, the boring tool of this embodiment has a tip 14 attached to the tip and side of a substantially cylindrical tool body 13 consisting of a cutting edge portion IO1, a neck portion it, and a shank 12. It is what it is.
第1図ないし第3図に示すように、上記チップ14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15のいずれか
一方が上記刃先部IOの先端逃げ面16及び外周面17
から突出された状態で、かつ、そのすくい面18に正の
すくい角が与えられた状態で刃先部IOの先端−側部に
着脱自在に装着されている。そして、上記切刃15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12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 14 is
It is made by molding cemented carbide into a plate shape that is approximately rhombic in plan view, and one of the cutting edges 15 formed at two opposing corners is the tip flank 16 of the cutting edge portion IO and the outer circumferential surface. 17
It is removably attached to the tip-to-side portion of the cutting edge portion IO in a state in which it protrudes from the blade and a positive rake angle is given to its rake face 18. The height of the cutting edge 15 is as follows in the side view of the boring tool (FIG. 3):
It is set at approximately the same height as the axis O of the shank 12.
また、上記工具本体13の刃先部IOから首部itにか
けての外周部には、当該中ぐリバイトの先端及び上方(
第3図において上方)に向かって開口するチップポケッ
ト20が形成されている。Further, on the outer periphery from the cutting edge IO to the neck IT of the tool body 13, the tip and upper part of the boring rebit (
A chip pocket 20 is formed that opens upward (in FIG. 3).
このチップポケット20は、刃先部IOの径方向に直線
状に延在して上記チップすくい面18と略面−をなす平
坦な底面21と、この底面21から突出し、かつ、上記
先端逃げ面16のチップ14に対して径方向反対側に位
置する端部よりも上記チップ14側の部分からシャンク
軸線Oと交差する方向に直線的に延在して上記首部l!
外周面のチップI4に連なる側に至る縦壁面22とを有
してなるものである。The chip pocket 20 includes a flat bottom surface 21 that extends linearly in the radial direction of the cutting edge portion IO and forms a substantially plane with the chip rake surface 18, and a flat bottom surface 21 that protrudes from the bottom surface 21 and extends straight in the radial direction of the cutting edge portion IO. The neck l! extends linearly in a direction intersecting the shank axis O from a portion closer to the tip 14 than the end located on the radially opposite side to the tip 14 of the neck l!
It has a vertical wall surface 22 extending to a side of the outer circumferential surface connected to the chip I4.
第2図に示すように、上記縦壁面22は、上記底面21
に連なる円弧部23と、この円弧部23に連なって工具
外周面まで直線的に延性する平坦部24とから構成され
ている。As shown in FIG. 2, the vertical wall surface 22 is connected to the bottom surface 21.
It is composed of a circular arc portion 23 continuous to the circular arc portion 23, and a flat portion 24 continuous to the circular arc portion 23 and linearly ductile to the outer peripheral surface of the tool.
第1図に示すように、縦壁面22の延在方向、すなわち
、上記円弧部23と底面21とか交わる点にtOって描
いた交線25がシャンク軸線Oとなす角度αは、被削材
の材質等に応じて適宜窓められるが、なるべくは!5°
〜45゛の範囲に定めることが好ましい。角度αが15
°に満ノニないと、チップポケット20のシャンク軸線
方向にわける長さが長くなり過ぎて首部11の剛性が過
度にl員なわれろおそれが生じ、他力、角度αが45°
を超えると、チップすくい面18に)Oって成長する切
屑の成長方向と縦壁面22の延在方向とが交わる角度が
大き過ぎて、醒部11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。As shown in FIG. 1, the angle α between the extending direction of the vertical wall surface 22, that is, the intersection line 25 drawn at tO at the point where the circular arc portion 23 intersects the bottom surface 21, and the shank axis O is It can be windowed as appropriate depending on the material etc., but as much as possible! 5°
It is preferable to set it in the range of ~45°. Angle α is 15
If the angle α is less than 45°, the length of the chip pocket 20 in the shank axis direction will become too long, and the stiffness of the neck 11 may become excessively large.
If the angle exceeds the angle between the growth direction of the chips growing on the chip rake face 18 and the extending direction of the vertical wall surface 22, there is a possibility that the chips cannot be smoothly guided to the outer circumferential side of the recessed portion 11. This is because
また、上記縦壁面22の先端逃げ面i6における稜線と
上記底面21とが交わる点PIから切刃15までの工具
径方向における距離Qlは、上記シャンク軸線Oから切
刃15までの工具径方向の距離をSとしたときに、1.
39を超えない範囲で定めることが好ましい。距離Ql
がト3sを超えると刃先部10先端の周方向の肉厚が不
足して工具剛性がl員なわれるおそれが生じるからであ
る。Further, the distance Ql in the tool radial direction from the point PI where the ridge line on the tip flank i6 of the vertical wall surface 22 intersects with the bottom surface 21 to the cutting edge 15 is the distance Ql in the tool radial direction from the shank axis O to the cutting edge 15. When the distance is S, 1.
It is preferable to set it within a range not exceeding 39. Distance Ql
This is because if it exceeds 3s, the wall thickness in the circumferential direction at the tip of the cutting edge portion 10 will be insufficient, which may reduce the tool rigidity.
また、上記底面21に対する縦壁面22の傾斜角、すな
わち、第4図に示すように、チップポケット20を、縦
壁面22の延在方向と直交する方向から断面視したとき
に底面21と縦壁面22の平坦部24とがなす角βは、
切削条件等に応じて適宜窓められるが、なるべくは90
′″〜12o°の範囲が好ましい。角度βが901こ満
だないとデツプポケット20の体積が不足17て切屑の
排出ttEが劣化するおそれが生じ、他方角度βが12
0゜を超えると刃先部lO先端肉厚が不足して十分な剛
性が得られないおそれが生じるからである。In addition, the inclination angle of the vertical wall surface 22 with respect to the bottom surface 21, that is, as shown in FIG. The angle β formed by the flat part 24 of 22 is
The window can be adjusted as appropriate depending on the cutting conditions, etc., but preferably 90
It is preferable that the angle β be in the range of 12° to 12°.
This is because if the angle exceeds 0°, the wall thickness at the tip of the cutting edge portion lO may be insufficient and sufficient rigidity may not be obtained.
第1図ないし第3図に示すように、上記首部llは、上
記シャンク12よりも大径に形成された置注体の外周面
に、当該醒部!l先端の上記チップポケット20の開口
部に連なる位置から首部11の基端に向かうに従って漸
次シャンク軸線○に近接する逃げ部26が形成されてな
るものである。As shown in FIGS. 1 to 3, the neck portion 11 is formed on the outer circumferential surface of the implantation body, which is formed to have a larger diameter than the shank 12. Relief portions 26 are formed that gradually approach the shank axis ◯ from a position connected to the opening of the tip pocket 20 at the tip end toward the base end of the neck portion 11.
上記遥げ部26は、首部llの外周部を、そのソヤンク
軸線Oと直交する断面視において略三日月状に切り欠く
ことによって形成されてなるしので、上記切欠き部分の
形状は、首部l!各部の上記断面視における断面積が、
上記シャンク12の断面積を下回らない範囲で首部11
の先端から基端に向かうに従って不均一に減少するよう
に定められている。The protruding portion 26 is formed by cutting out the outer circumferential portion of the neck portion 11 in a substantially crescent shape in a cross-sectional view perpendicular to the soyank axis O. Therefore, the shape of the cutout portion is the same as that of the neck portion 11. The cross-sectional area of each part in the above cross-sectional view is
The neck 11 within a range not less than the cross-sectional area of the shank 12
It is determined that it decreases unevenly from the distal end to the proximal end.
また、上記首部11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窓められるが、上記切
刃I5の先端から首部11の基端までのシャンク軸線方
向におけろ距離りが、上記距離Sに対して68〜IOs
の範囲となるように定めることが好ましい。距離りが6
8に満たないと、後述するように、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、距離りが109を超えると首部11の切削抵
抗による撓み変形量が大きくなり過ぎて加工精度か劣化
するおそれが生じるからである。The length of the neck 11 is determined as appropriate depending on the length in the axial direction of the hole of the workpiece to be cut, but the length of the shank from the tip of the cutting blade I5 to the base of the neck 11 is The distance in the axial direction is 68 to IOs for the above distance S.
It is preferable to set it within the range of . The distance is 6
If the distance is less than 8, as will be described later, there is a risk that the vibration damping effect of having a flexible structure as a whole will not be sufficiently exhibited.On the other hand, if the distance exceeds 109, the amount of bending deformation due to cutting resistance of the neck 11 will be reduced. This is because there is a risk that machining accuracy will deteriorate if the size becomes too large.
以上のように構成された中ぐリバイ)・を用いて被削材
の内径加工を行うには、上述17た従来の中ぐリバイト
と同様に、上記シヤンク12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+4をその穴部のl1ll線回りに
回転させつつ、上記工作機械の工具把持部とワーク把持
部との間に上記シヤンク12の軸線方向の相対運動を与
えて上記刃先10及び首部11を上記被削材の穴部に挿
入してゆくことにより、チップ14の切刃15で被11
+口オの穴部を切削して所定寸法に拡径してゆく。In order to perform internal diameter machining of a workpiece using the boring rebit machine configured as described above, the shank 12 is passed through the holder to the tool of the machine tool, similar to the conventional boring part 17 mentioned above. After that, while rotating the workpiece +4 held by the workpiece gripping part of the machine tool around the l1ll line of the hole, a By applying relative movement in the axial direction of the shank 12 and inserting the cutting edge 10 and the neck portion 11 into the hole of the workpiece, the cutting edge 15 of the tip 14 moves the workpiece 11.
+ Cut the hole at the mouth and expand the diameter to the specified size.
このとき、上記刃先部IOにはチップすくい重重8とほ
ぼ直交する方向の切削1氏抗が加わるため、上述[5た
従来の中ぐりバイトのように刃先部10を径方向全長に
渡って切り欠いた刃先部10の剛性が低いものにあって
は、切削抵抗によって刃先部lOが容易に変形し、これ
に伴って切刃15の高さが変化して加工精度の悪化を招
く。At this time, since a cutting resistance in a direction substantially perpendicular to the chip scooping weight 8 is applied to the cutting edge portion IO, the cutting edge portion 10 is cut over the entire radial length as in the conventional boring bit described in [5] above. If the rigidity of the chipped edge portion 10 is low, the edge portion IO is easily deformed by cutting resistance, and the height of the cutting edge 15 changes accordingly, resulting in deterioration of machining accuracy.
ところが、本実施例の中ぐリバイトにおいては、チップ
ポケット20の縦壁面22が、先端部げ面16のチップ
t4に対して径方向反対側に位置する端部よりもチップ
14側の部分からシヤンク軸線Oと交差する方向に延在
するため、刃先部10の先端部分が従来のチップポケッ
ト7のように径方向全長に渡って切り欠かれることなく
、チップポケット20の背後、すなわち刃先部10先端
のチップ14に対して径方向反対側に位置する部分がリ
ブ状に残される。このため、刃先部10の剛性か向上し
て切削抵抗による刃先部10の変形量が減少し、この結
果、切刃高さの変化が小さくなって、良好な加工精度を
実現できるのである。However, in the center rebiting of this embodiment, the vertical wall surface 22 of the tip pocket 20 is shunted from a portion closer to the tip 14 than the end portion of the distal end face 16 located on the opposite side in the radial direction with respect to the tip t4. Because it extends in the direction intersecting the axis O, the tip portion of the cutting edge portion 10 is not cut out over the entire radial length like the conventional chip pocket 7, but is cut out behind the chip pocket 20, that is, at the tip of the cutting edge portion 10. A portion located radially opposite to the tip 14 is left in the shape of a rib. Therefore, the rigidity of the cutting edge portion 10 is improved, the amount of deformation of the cutting edge portion 10 due to cutting resistance is reduced, and as a result, changes in the height of the cutting edge are reduced, and good machining accuracy can be achieved.
この場合、切刃15で生成された切屑は、チップポケッ
ト20の底面21に沿って成長し、縦壁面22の円弧部
23に沿って丸め込まれつつ平坦部24に沿って首部1
1外周の逃げ部26へと逐次案内されてゆく。このため
、チップポケット20を刃先部10の径方向全長に渡っ
て切り欠かなくとも、切屑排出性は何等劣化しない。In this case, the chips generated by the cutting edge 15 grow along the bottom surface 21 of the chip pocket 20, are rolled up along the arcuate portion 23 of the vertical wall surface 22, and continue along the flat portion 24 of the neck portion 1.
It is successively guided to the relief part 26 on the outer periphery. Therefore, even if the chip pocket 20 is not cut out over the entire radial length of the cutting edge portion 10, the chip evacuation performance will not deteriorate in any way.
さらに、遥げ部26が首部11の先端から基端に向かう
に従って漸次シャンク軸線0に近接するため、刃先部I
O及び置部11を被削材の穴部に挿入するにつれて、す
なわち加工が進行するにつれて被削材の穴部内壁との間
の隙間が拡大する。Furthermore, since the protruding portion 26 gradually approaches the shank axis 0 from the distal end to the proximal end of the neck portion 11, the cutting edge portion I
As the O and the placing part 11 are inserted into the hole of the workpiece, that is, as the machining progresses, the gap between the O and the inner wall of the hole of the workpiece increases.
このため、特に加工深さが深くなっても、切屑排出性が
良好に保たれるという効果を奏する。Therefore, even if the machining depth becomes deep, the chip evacuation property is effectively maintained.
また、本実施例の中ぐリバイトにあっては、首部11の
断面積の変化に伴って首部11各部の質量がシャンク1
2に向かうにつれて不均一に減少し、さらに、逃げ部2
6を形成したことにより、首部11の細心位置がシャン
ク軸線0から漸次ずれてゆくので、切削抵抗の変動に伴
って刃先部IOに振動が発生しても、この振動がシャン
ク12まで一様に伝達されることがない。従って、首部
l!の各部に周波数や位相が異なる多様な振動が生じて
互いに干渉し合うこととなり、この結果、びびり振動の
成長も阻止される。In addition, in the center rebiting of this embodiment, as the cross-sectional area of the neck 11 changes, the mass of each part of the neck 11 changes from the shank 1.
It decreases unevenly toward 2, and furthermore, the relief part 2
6, the fine position of the neck 11 gradually deviates from the shank axis 0, so even if vibration occurs at the cutting edge IO due to fluctuations in cutting resistance, this vibration will be uniformly transmitted to the shank 12. never transmitted. Therefore, the neck l! Various vibrations with different frequencies and phases occur in each part of the motor and interfere with each other, and as a result, the growth of chatter vibration is also inhibited.
なお、以上の実施例においては、特にチップ14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、ロウ付げによるもの、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。Note that in the above embodiments, the tip 14 is detachably attached, but the present invention is not limited to this, and the present invention is not limited to this. However, it is naturally applicable.
また、チップポケット20の縦壁面22は必ずしもシャ
ンク軸線Oと交差する方向に直線的に延在させる必要は
なく、例えば、第5図に示すように、工具外周側におい
て円弧状に湾曲する湾曲部28を設ける等、種々変形可
能である。この場合、縦壁面22の先端部げ面16にお
ける稜線と底面21とが交わる点Plから切刃+5まで
の距離Qについては、上記実施例と同様の範囲に定める
ことが好ましいが、切刃15の先端から縦壁面22の首
部l!外周面側の稜線と底面2Iとが交わる点Plまで
の距離Qlについても、上記距離Q、に対して121〜
3Q1の範囲に定めることが好ましい。Further, the vertical wall surface 22 of the chip pocket 20 does not necessarily have to extend linearly in a direction intersecting the shank axis O, but for example, as shown in FIG. Various modifications such as providing 28 are possible. In this case, the distance Q from the point Pl where the ridge line and the bottom surface 21 intersect on the tip end surface 16 of the vertical wall surface 22 to the cutting edge +5 is preferably set in the same range as in the above embodiment; From the tip of the neck l of the vertical wall surface 22! Regarding the distance Ql to the point Pl where the ridgeline on the outer peripheral surface side and the bottom surface 2I intersect, 121~
It is preferable to set it within the range of 3Q1.
距離QlがQlに満たないとチップポケット20から首
部11の外周面側に排出される切屑の排出方向がシャン
ク軸@Oに対して傾き過ぎて切屑が首部11の基端側に
向けて円滑に案内されないおそれが生じ、他方距離Ql
が3 Qlを超えると首部11の軸方向の切欠き長さ
が大きくなって剛性が過度に損なわれるおそれが生じる
からである。If the distance Ql is less than Ql, the direction in which chips are discharged from the chip pocket 20 toward the outer circumferential surface of the neck 11 is too inclined with respect to the shank axis @O, and the chips are smoothly directed toward the proximal end of the neck 11. There is a risk that you will not be guided, and on the other hand, the distance Ql
This is because if exceeds 3Ql, the length of the notch in the axial direction of the neck portion 11 becomes large, and there is a risk that the rigidity will be excessively impaired.
また、首部11の形状については本実施例のしのに限ら
ず、第6図ないし第8図に示す従来の中<” l)バイ
トのように、シャンク3よりも小径のものでも当然に適
用できる。Furthermore, the shape of the neck portion 11 is not limited to the shape of this embodiment, but can naturally be applied to those with a smaller diameter than the shank 3, such as the conventional medium-sized bits shown in FIGS. 6 to 8. can.
[発明の効果]
以上説明したように、この発明によれば、工具本体の先
端部が径方向全長に渡って切り欠かれることなく、切刃
に対して径方向反対側の部分かりブ状に残されるので、
工具本体先端部の剛性が向上して、切削抵抗による工具
先端の変形量か減少する。このため、工具先端の変形に
伴う切刃高さの変化を防止して、良好な加工精度を実現
できるという優れた効果を奏する。[Effects of the Invention] As explained above, according to the present invention, the tip of the tool body is not notched over the entire length in the radial direction, and the part on the opposite side in the radial direction to the cutting edge is shaped like a protrusion. Because it will be left behind,
The rigidity of the tip of the tool body is improved, and the amount of deformation of the tip of the tool due to cutting resistance is reduced. For this reason, it is possible to prevent changes in the height of the cutting edge due to deformation of the tool tip, and achieve excellent machining accuracy.
第1図ないし第4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■矢視図、第4図は第1図中■−
■線における断面図、第5図は上記実施例の変形例を示
す平面図、第6図ないし第8図は従来例を示す図で、第
6図はその平面図、第7図はその正面図、第8図はその
側面図である。
13・・・・・・工具本体、14・・・・・・スローア
ウェイチップ、1.5・・・・・切刃、20・・・・・
チップポケット、1
底面(切刃に連なる壁面)。1 to 4 show an embodiment of the present invention,
Figure 1 is a plan view, Figure 2 is a view in the direction of the I arrow in Figure 1, Figure 3 is a view in the direction of the ■ arrow in Figure 1, and Figure 4 is a view in the direction of the ■ - in Figure 1.
5 is a plan view showing a modified example of the above embodiment, FIGS. 6 to 8 are views showing a conventional example, FIG. 6 is a plan view thereof, and FIG. 7 is a front view thereof. FIG. 8 is a side view thereof. 13... Tool body, 14... Throwaway tip, 1.5... Cutting blade, 20...
Chip pocket, 1 Bottom surface (wall surface connected to the cutting edge).
Claims (1)
端逃げ面及び外周面に開口するチップポケットが形成さ
れ、このチップポケットの先端壁面に、当該工具本体の
先端及び外周に突出する切刃が設けられてなる中ぐりバ
イトにおいて、 上記チップポケットを、上記切刃に連なる壁面と直交す
る方向から平面視した状態で、上記先端逃げ面の上記切
刃に対して径方向反対側に位置する端部よりも上記切刃
側の位置から、工具本体外周面の上記切刃に連なる側部
に至る溝状に形成したことを特徴とする中ぐりバイト。[Scope of Claims] A chip pocket opening to the tip flank and outer peripheral surface of the tool body is formed at the tip of the tool body having a substantially cylindrical shape, and the tip of the tool body is formed on the tip wall of the chip pocket. and a boring tool provided with a cutting edge protruding from the outer periphery, when the chip pocket is viewed in plan from a direction perpendicular to the wall surface continuous to the cutting edge, with respect to the cutting edge of the tip flank. A boring bit characterized in that a groove is formed from a position closer to the cutting edge than an end located on the opposite side in the radial direction to a side portion of the outer peripheral surface of the tool body that is continuous with the cutting edge.
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1163304A JPH0332507A (en) | 1989-06-26 | 1989-06-26 | Boring tool |
KR1019900006945A KR950013213B1 (en) | 1989-06-26 | 1990-05-15 | Boring bar tool |
US07/544,176 US5156503A (en) | 1989-06-26 | 1990-06-26 | Boring bar tool |
EP94104604A EP0609908B1 (en) | 1989-06-26 | 1990-06-26 | Boring bar tool |
EP90112122A EP0405443B1 (en) | 1989-06-26 | 1990-06-26 | Boring bar tool |
DE69028998T DE69028998T2 (en) | 1989-06-26 | 1990-06-26 | Boring bar tool |
DE69013411T DE69013411T2 (en) | 1989-06-26 | 1990-06-26 | Rod for drilling. |
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 |
---|---|---|---|
JP1163304A JPH0332507A (en) | 1989-06-26 | 1989-06-26 | Boring tool |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0332507A true JPH0332507A (en) | 1991-02-13 |
Family
ID=15771283
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1163304A Pending JPH0332507A (en) | 1989-06-26 | 1989-06-26 | Boring tool |
Country Status (2)
Country | Link |
---|---|
JP (1) | JPH0332507A (en) |
KR (1) | KR950013213B1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010105084A (en) * | 2008-10-29 | 2010-05-13 | Kyocera Corp | Holder, cutting tool using the same, and cutting method using the cutting tool |
JPWO2019107204A1 (en) * | 2017-11-28 | 2020-11-19 | 京セラ株式会社 | Manufacturing method of cutting tools and cutting products |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5074285A (en) * | 1973-10-29 | 1975-06-18 |
-
1989
- 1989-06-26 JP JP1163304A patent/JPH0332507A/en active Pending
-
1990
- 1990-05-15 KR KR1019900006945A patent/KR950013213B1/en not_active IP Right Cessation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5074285A (en) * | 1973-10-29 | 1975-06-18 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010105084A (en) * | 2008-10-29 | 2010-05-13 | Kyocera Corp | Holder, cutting tool using the same, and cutting method using the cutting tool |
JPWO2019107204A1 (en) * | 2017-11-28 | 2020-11-19 | 京セラ株式会社 | Manufacturing method of cutting tools and cutting products |
Also Published As
Publication number | Publication date |
---|---|
KR950013213B1 (en) | 1995-10-26 |
KR910000277A (en) | 1991-01-29 |
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