JP2004058168A - Cutting tool for precision machining - Google Patents
Cutting tool for precision machining Download PDFInfo
- Publication number
- JP2004058168A JP2004058168A JP2002216199A JP2002216199A JP2004058168A JP 2004058168 A JP2004058168 A JP 2004058168A JP 2002216199 A JP2002216199 A JP 2002216199A JP 2002216199 A JP2002216199 A JP 2002216199A JP 2004058168 A JP2004058168 A JP 2004058168A
- Authority
- JP
- Japan
- Prior art keywords
- cutting edge
- cutting
- edge
- tool
- chamfer
- 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.)
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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
- B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
-
- 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
- B23B27/005—Geometry of the chip-forming or the clearance planes, e.g. tool angles
-
- 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
- B23B27/007—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor for internal turning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2200/00—Details of cutting inserts
- B23B2200/20—Top or side views of the cutting edge
- B23B2200/201—Details of the nose radius and immediately surrounding area
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2200/00—Details of cutting inserts
- B23B2200/24—Cross section of the cutting edge
- B23B2200/242—Cross section of the cutting edge bevelled or chamfered
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2200/00—Details of cutting inserts
- B23B2200/28—Angles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
Abstract
Description
【0001】
【発明の属する技術分野】
この発明は、電子機器部品などの高精度小物部品の精密加工を行う切削工具に関する。
【0002】
【従来の技術】
精密部品の仕上げ加工では、高加工精度が要求される。その要求に対し、加工の高能率化が図れる旋削加工で応えようとすると、刃先の工夫された切削工具が必要になる。
【0003】
旋削加工において、加工面の面粗さを小さくするためには、刃先のノーズRを大きくして幾何学的な関係から決定される理論面粗さを小さくすればよいことが知られているが、刃先のノーズRを大きくすると切削背分力が増大する。
【0004】
このため、精密部品の加工ではノーズR0.03mm程度のチップが用いられ、また、それでもノーズRが大きい場合にはノーズR0のチップが用いられている。
【0005】
また、ノーズRを小さくすることによる加工面の荒れを抑えるために、一般に、送り0.02mm/rev以下、切り込み0.1mm以下の切削条件が採用されている。
【0006】
【発明が解決しようとする課題】
上記の切削条件では切屑が薄くなって被削材が切れ難くなり、その状況でノーズRが大きくて切削背分力が増大すると、加工面がうねったり、工具のいわゆるビビリ(振動)が発生して加工面の面粗さが悪化する。
【0007】
また、この問題に対応するためにノーズRを小さくしているが、ノーズRを小さくすると刃先強度が低下して刃先に集中する応力により刃先が欠け易くなり、工具寿命が低下する。
【0008】
なお、加工面の面粗さを小さくするために、横切れ刃角を定義する基準面に対して5°以下の角度をもつさらい刃をつけることもなされているが、これは、ノーズRを大きくしたときと同様に切削背分力が増大して面粗さを悪化させる加工面のうねりや工具のビビリが発生する。
【0009】
この発明は、上述した切削背分力の増加の問題と刃先強度低下の問題を併せて解決することを課題としている。
【0010】
【課題を解決するための手段】
上記の課題を解決するため、この発明においては、切れ刃部に、刃先先端の横切れ刃角を6度よりも大、刃先後部の横切れ刃角よりも小となすチャンファを有し、刃先のノーズRが0.02mm以下に設定されている精密加工用切削工具と、切れ刃部に、刃先先端の前切れ刃角を刃先後部の前切れ刃角よりも大、84度よりも小となすチャンファを有し、刃先のノーズRが0.02mm以下に設定されている精密加工用切削工具を提供する。
【0011】
どちらの工具も、ノーズRのより好ましい値は0.01mm以下である。これ等の工具は、穴径5mm以下、穴深さ5mm以上の穴の内径加工を行うボーリングバイトとして構成されている場合に特に顕著な効果が得られる。
【0012】
【作用】
刃先のノーズRを0.02mm以下にしたので、ノーズRを0.03mm程度にした従来工具と比較すると切削抵抗が減少し、加工面のうねりや工具のビビリが無くなる。
【0013】
また、チャンファをつけると、刃先形状をノーズRの大きな刃先やさらい刃を形成した刃先の形状に近づけて理論面粗さを小さくすることができ、ノーズRを小さくしたことによる加工面の荒れを妨げる。
【0014】
さらに、チャンファの設置により刃先が強化されてノーズRを小さくしたことによる刃先強度の低下も補われ、従って、この発明によれば高加工精度の確保と工具の寿命向上を両立させることができる。
【0015】
【発明の実施の形態】
図1に、この発明の切削工具の実施形態を示す。この切削工具は、内径加工用のボーリングバイトであって、シャンク1の先端に切れ刃3を有する。2はシャンク1と一体に加工された工具ホルダへの取付部である。
【0016】
切れ刃3は、シャンク1の先端に一体に形成されるもの、シャンク1の先端にチップを接合してそのチップに形成されるもののどちらであってもよい。
【0017】
この切れ刃3の刃先形状の一例を図2、図3に示す。
図2の切れ刃3は、刃先先端部に、刃先先端の横切れ刃角αを6度を下限にして刃先後部の横切れ刃角α1よりも小さくするチャンファ4を設けている。また、横切れ刃3aとチャンファ4との交差部に生じるノーズの曲率半径R(ノーズR)を0.02mm以下にしている。
【0018】
この切れ刃3は、チャンファ4を設けることでノーズRを小さくすることによる刃先強度の低下を防ぎ、かつ、ノーズRを小さくすることで切削抵抗を低減させている。
【0019】
なお、チャンファ4は、横切れ刃角αをα1よりも小さくするものでなければ、チャンファ設置による刃先強化と理論面粗さの低減効果が得られない。また、角度αが6度以下のチャンファ4は、従来のさらい刃と機能上差の無いものになって切削抵抗を増大させ、加工面のうねりや工具のビビリを無くすことができない。
【0020】
さら、ノーズRは、工具を成形するときにどうしてもコーナに丸味が生じてしまうが、その値を0.02mm以下にしないと切削抵抗が増大して加工面の面粗さが悪化する。そのノーズRは、精密研磨などで0.02mm以下にすることができる。
【0021】
このノーズRを0.01mm以下にすれば、うねりの小さいより良い加工面が得られる。
【0022】
図3の切れ刃3は、刃先先端部に、刃先先端の前切れ刃角βを84度を上限にして刃先後部の前切れ刃角β1よりも増大させるチャンファ5を設け、さらに、前切れ刃3bとチャンファ5との交差部に生じるノーズの曲率半径Rを0.02mm以下にしている。この図3の切れ刃3も、ノーズRを小さくして切削抵抗を低減し、さらに、ノーズRを小さくすることによる刃先強度の低下をチャンファ5を設けて防いでいる。
【0023】
チャンファ5の前切れ刃角βは、80度〜60度で刃先後部の前切れ刃角β1よりも小に設定すると特に良い。
【0024】
また、ノーズRは、図2の切れ刃と同様、0.01mm以下にすると切削抵抗がより減少して好ましい。
【0025】
なお、図2の刃形は、前切れ刃角を小さく設定する工具に適し、一方、図3の刃形は、横切れ刃角を小さく設定する工具に適する。
【0026】
また、図1の如きボーリングバイトが、穴径5mm以下、穴深さ5mm以上の穴の内径加工用として構成されている場合、シャンク1の剛性が低くなるため切削抵抗で刃先が逃げ易く、従って、このような工具に図2、図3の刃形を利用すると特に効果がある。
【0027】
【発明の効果】
以上述べたように、この発明の切削工具は、刃先のノーズRを0.02mm以下にして切削抵抗を低減し、また、ノーズRを小さくすることによる刃先強度の低下、理論面粗さの荒れを、刃先先端の横切れ刃や前切れ刃にチャンファをつけて防ぐようにしたので、切削抵抗による加工面のうねり、工具のビビリを無くして加工面の面品位を向上させ、同時に刃先の欠損を減らして工具寿命を向上させることが可能になる。
【図面の簡単な説明】
【図1】この発明の切削工具の実施形態を示す斜視図
【図2】刃先の刃形の一例を示す拡大平面図
【図3】刃先の刃形の他の例を示す拡大平面図
【符号の説明】
1 シャンク
2 取付部
3 切れ刃
3a 横切れ刃
3b 前切れ刃
α、α1 横切れ刃角
β、β1 前切れ刃角
R ノーズの曲率半径(ノーズR)[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cutting tool for precision machining small precision parts such as electronic equipment parts.
[0002]
[Prior art]
In the finishing of precision parts, high processing accuracy is required. In order to meet such demands by turning, which can increase the efficiency of machining, a cutting tool with a devised cutting edge is required.
[0003]
In turning, it is known that the surface roughness of the machined surface can be reduced by increasing the nose R of the cutting edge to reduce the theoretical surface roughness determined from a geometrical relationship. When the nose R of the cutting edge is increased, the cutting back force increases.
[0004]
For this reason, a chip having a nose radius of about 0.03 mm is used in the processing of precision parts, and a nose radius R0 tip is used when the nose radius is still large.
[0005]
Further, in order to suppress the roughness of the machined surface due to the reduction of the nose R, cutting conditions of feed 0.02 mm / rev or less and cutting depth 0.1 mm or less are generally adopted.
[0006]
[Problems to be solved by the invention]
Under the above cutting conditions, the chips become thin and the work becomes difficult to cut. If the nose radius is large and the cutting back force increases in such a situation, the machined surface undulates and so-called chatter (vibration) of the tool occurs. As a result, the surface roughness of the machined surface deteriorates.
[0007]
In order to cope with this problem, the nose radius is reduced. However, when the nose radius is reduced, the edge strength is reduced and the edge is easily chipped due to stress concentrated on the edge, thereby shortening the tool life.
[0008]
In addition, in order to reduce the surface roughness of the machined surface, a knurling blade having an angle of 5 ° or less with respect to a reference plane defining the transverse cutting edge angle is also provided. In the same manner as when the cutting is performed, the undulation of the machined surface and the chatter of the tool, which deteriorate the surface roughness due to the increase of the cutting back force, occur.
[0009]
SUMMARY OF THE INVENTION It is an object of the present invention to solve both the above-described problem of increase in the cutting back force and the problem of reduction of the cutting edge strength.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, in the present invention, the cutting edge portion has a chamfer that makes the lateral cutting edge angle at the tip of the cutting edge larger than 6 degrees and smaller than the lateral cutting edge angle at the rear portion of the cutting edge. A cutting tool for precision machining in which R is set to 0.02 mm or less, and a chamfer in which the front cutting edge angle at the tip of the cutting edge is larger than the front cutting edge angle at the rear portion of the cutting edge and smaller than 84 degrees. And a cutting tool for precision machining in which the nose R of the cutting edge is set to 0.02 mm or less.
[0011]
For both tools, the more preferable value of the nose radius is 0.01 mm or less. Particularly remarkable effects can be obtained when these tools are configured as boring tools for performing an inner diameter machining of a hole having a hole diameter of 5 mm or less and a hole depth of 5 mm or more.
[0012]
[Action]
Since the nose R of the cutting edge is set to 0.02 mm or less, the cutting resistance is reduced as compared with a conventional tool in which the nose R is set to about 0.03 mm, and undulation of the machined surface and chatter of the tool are eliminated.
[0013]
When chamfering is applied, the theoretical surface roughness can be reduced by bringing the shape of the cutting edge closer to the shape of a cutting edge having a large nose radius or a razor blade, and the roughness of the machined surface due to the reduced nose radius can be reduced. Hinder.
[0014]
Further, the lowering of the nose radius due to the strengthening of the cutting edge due to the installation of the chamfer also compensates for the decrease in the cutting edge strength. Therefore, according to the present invention, it is possible to achieve both high processing accuracy and a long tool life.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows an embodiment of a cutting tool according to the present invention. This cutting tool is a boring tool for internal diameter machining, and has a
[0016]
The
[0017]
An example of the shape of the cutting edge of the
The
[0018]
The
[0019]
If the chamfer 4 does not make the lateral cutting edge angle α smaller than α1, the effect of strengthening the cutting edge and reducing the theoretical surface roughness by installing the chamfer cannot be obtained. In addition, the chamfer 4 having the angle α of 6 degrees or less has no functional difference from the conventional razor blade, increases the cutting resistance, and cannot eliminate the undulation of the machined surface and the chatter of the tool.
[0020]
In addition, the nose R inevitably causes rounded corners when a tool is formed, but if the value is not less than 0.02 mm, the cutting resistance increases and the surface roughness of the machined surface deteriorates. The nose radius can be reduced to 0.02 mm or less by precision polishing or the like.
[0021]
If the nose R is set to 0.01 mm or less, a better processed surface with small undulation can be obtained.
[0022]
The
[0023]
It is particularly preferable that the front cutting edge angle β of the chamfer 5 is set at 80 to 60 degrees and smaller than the front cutting edge angle β1 at the rear of the cutting edge.
[0024]
The nose radius is preferably set to 0.01 mm or less, as in the case of the cutting edge in FIG.
[0025]
The blade shape in FIG. 2 is suitable for a tool for setting a small front cutting edge angle, while the blade shape in FIG. 3 is suitable for a tool for setting a small horizontal cutting angle.
[0026]
In addition, when the boring tool as shown in FIG. 1 is configured for processing an inner diameter of a hole having a hole diameter of 5 mm or less and a hole depth of 5 mm or more, the rigidity of the shank 1 is reduced, so that the cutting edge can easily escape with cutting resistance, and therefore, The use of the blade shape shown in FIGS. 2 and 3 for such a tool is particularly effective.
[0027]
【The invention's effect】
As described above, the cutting tool according to the present invention reduces the cutting resistance by reducing the nose R of the cutting edge to 0.02 mm or less, decreases the cutting edge strength by reducing the nose R, and roughens the theoretical surface roughness. The chamfer is attached to the side cutting edge and front cutting edge at the tip of the cutting edge, eliminating the undulation of the cutting surface due to cutting resistance and the chatter of the tool, improving the surface quality of the cutting surface, and at the same time, preventing chipping of the cutting edge. It is possible to reduce and improve the tool life.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a cutting tool according to the present invention. FIG. 2 is an enlarged plan view showing an example of a blade edge. FIG. 3 is an enlarged plan view showing another example of a blade edge. Description]
DESCRIPTION OF SYMBOLS 1
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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JP2002216199A JP3950380B2 (en) | 2002-07-25 | 2002-07-25 | Cutting tool for precision machining |
Applications Claiming Priority (1)
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JP2002216199A JP3950380B2 (en) | 2002-07-25 | 2002-07-25 | Cutting tool for precision machining |
Publications (2)
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JP2004058168A true JP2004058168A (en) | 2004-02-26 |
JP3950380B2 JP3950380B2 (en) | 2007-08-01 |
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JP2002216199A Expired - Lifetime JP3950380B2 (en) | 2002-07-25 | 2002-07-25 | Cutting tool for precision machining |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006068031A1 (en) * | 2004-12-24 | 2006-06-29 | Kyocera Corporation | Throw-away tip, method of manufacturing the throw-away tip, and cutting tool using the throw-away tip |
DE102013210277A1 (en) | 2012-07-04 | 2014-01-09 | Japan Aviation Electronics Industry, Limited | Process for machining a cutting burr and instrument with machined cutting burr |
EP2756902A1 (en) | 2013-01-22 | 2014-07-23 | Japan Aviation Electronics Industry Limited | Edge tool |
CN108746682A (en) * | 2018-05-03 | 2018-11-06 | 国宏工具***(无锡)股份有限公司 | A kind of high finishing tool structure |
-
2002
- 2002-07-25 JP JP2002216199A patent/JP3950380B2/en not_active Expired - Lifetime
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006068031A1 (en) * | 2004-12-24 | 2006-06-29 | Kyocera Corporation | Throw-away tip, method of manufacturing the throw-away tip, and cutting tool using the throw-away tip |
DE102013210277A1 (en) | 2012-07-04 | 2014-01-09 | Japan Aviation Electronics Industry, Limited | Process for machining a cutting burr and instrument with machined cutting burr |
US9289910B2 (en) | 2012-07-04 | 2016-03-22 | Japan Aviation Electronics Industry, Limited | Method of processing ridge of cutting edge and instrument with processed ridge of cutting edge |
EP2756902A1 (en) | 2013-01-22 | 2014-07-23 | Japan Aviation Electronics Industry Limited | Edge tool |
US9114541B2 (en) | 2013-01-22 | 2015-08-25 | Japan Aviation Electronics Industry, Limited | Edge tool |
CN108746682A (en) * | 2018-05-03 | 2018-11-06 | 国宏工具***(无锡)股份有限公司 | A kind of high finishing tool structure |
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