JPS60118412A - End mill - Google Patents

End mill

Info

Publication number
JPS60118412A
JPS60118412A JP22772183A JP22772183A JPS60118412A JP S60118412 A JPS60118412 A JP S60118412A JP 22772183 A JP22772183 A JP 22772183A JP 22772183 A JP22772183 A JP 22772183A JP S60118412 A JPS60118412 A JP S60118412A
Authority
JP
Japan
Prior art keywords
cutting
end mill
slits
cutting edge
edge
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
Application number
JP22772183A
Other languages
Japanese (ja)
Inventor
Masahiro Nomura
政博 野村
Akira Isono
磯野　彰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP22772183A priority Critical patent/JPS60118412A/en
Publication of JPS60118412A publication Critical patent/JPS60118412A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/02—Milling-cutters characterised by the shape of the cutter
    • B23C5/10—Shank-type cutters, i.e. with an integral shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/08—Side or top views of the cutting edge
    • B23C2210/088—Cutting edges with a wave form

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)

Abstract

PURPOSE:To make it easy to bring chips out and improve the effectiveness of deep cutting by forming groove-like slits on the edge surface having the basic curve with an arbitrary angle of inclination against the axis of the cylinder and by arranging a lot of these slits. CONSTITUTION:An end mill has a lot of groove-like slits (d) arranged on its cutting edge having the nth degree curve as expressed by f=ax<n>+c (f is the edge outline) where x is coordinate expressing the circumferential length of the cylinder section and a, c, n are constants. The chips produced by cutting are brought out through the above slits d, making the deep cutting effective and enabling the high performance cutting.

Description

【発明の詳細な説明】 〔発明の属する技術分野〕 本発明は、切削加工分野のミーリング作業において使用
される切削工具のひとつであるエンドミルの重切削用と
しての外周切刃形状の改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to an improvement in the shape of the outer peripheral cutting edge for heavy cutting of an end mill, which is one of the cutting tools used in milling work in the cutting field.

〔従来技術の説明〕[Description of prior art]

ミーリング作業において重切削用として使用されるこれ
までのエンドミルば、一定のねじれ角によって円筒面に
刃付けが施され、基本線である外周切刃に溝状のスリッ
トが一定間隔で多数配列されており、その多くはいずれ
も多刃（３枚刃以上）エンドミルのタイプで、前記基本
線である外周切刃の展開形状は直線である。このため、
■　２装置エンドミルとしての切削負荷抵抗を軽減させ
るためにねじれ角を大きくすると、エンドミルの有効断
面積が小さくなり、曲げ剛性が低下する、 ■　上記欠点を補うために、刃数を３枚以上にして有効
断面積を大きくすると、刃溝が浅くなり切屑の排出が困
難となる、 ■　多刃（３枚刃以上）エンドミルでは底刃による軸方
向（Ｚ方向）の切込み加工に不適当である、などの欠点
があった。Conventional end mills used for heavy cutting in milling work have blades on the cylindrical surface with a certain helix angle, and a large number of groove-shaped slits arranged at regular intervals on the outer peripheral cutting edge, which is the basic line. Most of them are multi-blade (three or more blades) end mills, and the developed shape of the outer peripheral cutting edge, which is the basic line, is a straight line. For this reason,
■ If the helix angle is increased to reduce the cutting load resistance as a two-device end mill, the effective cross-sectional area of the end mill will become smaller and the bending rigidity will decrease. If the effective cross-sectional area is increased, the blade groove becomes shallower, making it difficult to eject chips. ■ Multi-blade (three or more blades) end mills are unsuitable for cutting in the axial direction (Z direction) with the bottom blade. There were drawbacks such as.

本出願人は、特願昭５８−８８４によってこれらの欠点
をなくすための切刃形状を有するエンドミルに関する出
願を行ったが、試験の結果さらに改良できることがわか
った。The present applicant filed an application in Japanese Patent Application No. 58-884 regarding an end mill having a cutting edge shape to eliminate these drawbacks, but as a result of tests, it was found that further improvements could be made.

〔発明の目的〕[Purpose of the invention]

本発明は、以上のような欠点を解決し、切屑の排出が容
易で重切削の加工に効果がある高性能の外周刃形状を有
するエンドミルを提供することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks and to provide an end mill having a high-performance peripheral edge shape that facilitates removal of chips and is effective in heavy cutting.

〔発明の特徴〕[Features of the invention]

本発明は、工具外径の円筒面上の外周切刃の基本曲線の
展開形状が円筒部分の周囲方向の長さに座標Ｘをとった
場合、Ｘ＞Ｏの任意の点より固成から刃元へ向かってね
じれ角が連続的に減少していくｎ次曲線で表される不等
角連続曲線として刃付けが施され、前記基本曲線よりな
る外周切刃に溝状のスリットを円筒軸に対し任意の傾斜
角（側面逃げ角）をもたせ前記スリットを軸方向に一定
の間隔で多数個配列したことを特徴とする。In the present invention, when the developed shape of the basic curve of the outer peripheral cutting edge on the cylindrical surface of the outer diameter of the tool takes the coordinate X to the length in the circumferential direction of the cylindrical part, the cutting edge is solidified from any point where X>O. Cutting is performed as an axonometric continuous curve represented by an n-dimensional curve in which the helix angle continuously decreases toward the origin, and a groove-shaped slit is made on the cylindrical axis on the outer cutting edge made of the basic curve. On the other hand, it is characterized in that a large number of the slits are arranged at regular intervals in the axial direction with arbitrary inclination angles (side clearance angles).

〔実施例による説明〕[Explanation based on examples]

第１図は本発明実施例エンドミルの先端外形状を示す図
である。第２図はその刃長ｌまでの外周切刃の展開図で
ある。第２図に示す展開図は、工具外径円筒部の周囲方
向の長さをＸ軸として、工具外径円筒面に切られた外周
切刃ｆを平面上に展開したものであり、本発明のエンド
ミルはその外周切刃をｆとすると ｆ　＝　ａｘｎ＋ｃ なるｎ次曲線の切刃部に前記溝状スリットｄを多数個配
列したところにその特徴がある。ａ、ｃおよびｎは定数
である。試験の結果その値は工具外径が１〜５０ｍｍψ
であるとき、 ａ　＝　Ｉ　Ｘ１０−２〜１０　Ｘ　１Ｏ−２ｃ＝Ｏ ｎ　＝　１．５　〜２．５ 程度に設定することが適当である。工具の外径が大きい
とこの定数ａの値は大きく選ぶ方がよ（、外径が小さい
と定数ａの値は小さく選ぶことがよい。定数Ｃは工具の
外径に応じて適当な値を選択することができる。定数ｎ
は被加工物の硬度その他の要因により一概に決定できな
いが、目安として硬い材料の場合はｎ−２を中心として
２．５までの範囲が好ましく、軟らかい材料の場合は１
．５までの範囲が好ましい。FIG. 1 is a diagram showing the outer shape of the tip of an end mill according to an embodiment of the present invention. FIG. 2 is a developed view of the outer peripheral cutting edge up to the blade length l. The developed view shown in FIG. 2 is a plan view of the outer peripheral cutting edge f cut on the outer cylindrical surface of the tool, with the length in the circumferential direction of the outer cylindrical part of the tool being the X-axis. The end mill is characterized in that a large number of the groove-like slits d are arranged on the cutting edge of an n-dimensional curve, where f = axn + c, where f is the outer peripheral cutting edge. a, c and n are constants. As a result of the test, the value is 1 to 50mmψ outside diameter of the tool.
When, it is appropriate to set a=IX10-2 to 10X1O-2c=On=1.5 to 2.5. If the outside diameter of the tool is large, it is better to choose a large value for this constant a (and if the outside diameter is small, it is better to choose a small value for the constant a. Set the constant C to an appropriate value according to the outside diameter of the tool. Can be selected.Constant n
cannot be definitively determined depending on the hardness of the workpiece and other factors, but as a guide, it is preferably within the range of 2.5 centered around n-2 for hard materials, and 1 for soft materials.
．． A range up to 5 is preferred.

第３図はこのエンドミルによる切削状態を示す説明図で
ある。■はエンドミル本体、２は被切削物を示す。矢印
で示す方向にエンドミルが進行している。FIG. 3 is an explanatory diagram showing the state of cutting by this end mill. ■ indicates the end mill body, and 2 indicates the object to be cut. The end mill is moving in the direction indicated by the arrow.

切削抵抗をベクトルｂにより表示する。この切削抵抗に
よる分布荷重はベクトルＣのようになり、刃物が一回転
する毎にエンドミルに作用する切削抵抗の作用点は上か
ら下へ、あるいは下から上へ連続的に変化し、固成に近
づくほどその力が減少するようになる。The cutting force is represented by vector b. The distributed load due to this cutting resistance is like a vector C, and the point of application of the cutting resistance acting on the end mill changes continuously from top to bottom or from bottom to top every time the cutter rotates once, and the point of application of the cutting resistance changes continuously from top to bottom or from bottom to top. The closer you get, the less its power becomes.

第４図は、前記外周切刃部の基本曲線ｆにスリットｄを
設けた切刃による切削加工の説明図である。刃１−１と
１−２に形成されたスリットｄは図のように一定ピッチ
ずれているため、多刃が順次切削を行い、しかも側面逃
げ角δを大きくとっているため軽快で高負荷切削ができ
るようになっている。図中矢印は回転方向を、ｊｌ、ｊ
２およびｔ３は刃１−２の切削量を示す。FIG. 4 is an explanatory view of cutting using a cutting blade in which a slit d is provided in the basic curve f of the outer peripheral cutting edge portion. The slits d formed on blades 1-1 and 1-2 are offset by a certain pitch as shown in the figure, so multiple blades perform sequential cutting, and the large side relief angle δ allows for light and high-load cutting. is now possible. The arrows in the figure indicate the rotation direction, jl, j
2 and t3 indicate the cutting amount of the blade 1-2.

本発明は、外周切刃の実効的に有効な範囲でその形状を
特徴とするものであり、有効性の薄い範囲では任意の便
利な形状とすることができる。The present invention is characterized by the shape of the peripheral cutting edge within the effectively effective range, and may have any convenient shape within the less effective range.

〔発明の効果〕〔Effect of the invention〕

このエンドミルによれば、従来のエンドミルに比べて一
様断面の切削時におけるエンドミル保持部近傍の最大曲
げモーメント（曲げ剛性）を３０％程度軽減することが
できる。According to this end mill, the maximum bending moment (bending rigidity) near the end mill holding part when cutting a uniform cross section can be reduced by about 30% compared to conventional end mills.

従って、同一切削条件下においては、より高負荷切削が
可能になり、特に小径（例えば３０ｍｍψ以下）のエン
ドミルの重切削に効果を発揮する。加王に伴う切屑の排
出は刃溝のチップポケットが十分法いため切屑の巻き込
みなどによる刃物の損耗も防ぐことができ、軸方向の切
り込み加工もできる利点がある。また、定数ａを任意の
範囲に設定しても、それに対応してｎを任意の範囲に設
定すれば得られる効果は変わらない。さらに外周切刃の
波形については本実施例では台形状としているが、三角
状その他の形状でも効果をあげることができる。Therefore, under the same cutting conditions, higher load cutting is possible, and is particularly effective in heavy cutting with small diameter end mills (for example, 30 mm ψ or less). The chip pocket in the blade groove is sufficiently spaced to discharge the chips that accompany kerating, which prevents wear and tear on the cutter due to the entrainment of chips, and has the advantage of being able to perform cutting in the axial direction. Further, even if the constant a is set to an arbitrary range, the effect obtained will not change if n is correspondingly set to an arbitrary range. Furthermore, although the waveform of the outer peripheral cutting edge is trapezoidal in this embodiment, triangular or other shapes can also be used to achieve the same effect.

本実施例では２装置エンドミルとして説明したが、多刃
（３枚刃以上）エンドミルでも本実施例のように基本曲
線をｎ次曲線とし、スリットを設けることにより側面加
工における重切削に優れた効果を発揮することができる
。Although this example was explained as a two-device end mill, even a multi-blade (three or more blades) end mill can have an excellent effect on heavy cutting during side machining by making the basic curve an n-th order curve and providing a slit as in this example. can demonstrate.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明実施例のエンドミルの外形図。 第２図はその外周切刃の展開図。 第３図は本発明実施例エンドミルによる切削加工の状態
図。 第４図は本発明実施例スリットを有するエンドミルによ
る切削加工説明図。 １・・・エンドミル本体、２・・・被加工物。FIG. 1 is an external view of an end mill according to an embodiment of the present invention. Figure 2 is a developed view of the outer cutting edge. FIG. 3 is a diagram showing the state of cutting by the end mill according to the embodiment of the present invention. FIG. 4 is an explanatory diagram of a cutting process using an end mill having a slit according to an embodiment of the present invention. 1... End mill body, 2... Workpiece.

Claims (1)

【特許請求の範囲】 （１，１工具外径の円筒面に対する外周切刃の基本曲線
の展開形状の少なくとも一部が ｆ　−ａｘｎ　＋ｃ （ただし、Ｘは円筒部分の周囲方向の長さを座標軸とし
て表し、ａ、ｃおよびｎは定数である。） で表されるｎ次曲線であるように力付けが施され、前記
外周切刃に台形溝状のスリットを円筒軸に対し任意の傾
斜角をもたせて軸方向に一定の間隔で設けられ、相対す
る外周切刃部が一回転したときに相互に一定ピッチだけ
ずれるように多数個配列されたことを特徴とするエンド
ミル。 （２）定数ｎが ｃ＝Ｑ ｎ　＞　１．５ である特許請求の範囲第（１）項に記載のエンドミル。[Claims] (At least a part of the developed shape of the basic curve of the outer peripheral cutting edge with respect to the cylindrical surface with the outer diameter of the 1,1 tool (where a, c, and n are constants.) Force is applied so that it forms an n-dimensional curve represented by An end mill characterized in that a large number of end mills are arranged at regular intervals in the axial direction, and are arranged in such a way that opposing peripheral cutting edges are shifted from each other by a constant pitch when one rotation is made. (2) Constant n The end mill according to claim 1, wherein c=Q n > 1.5.
JP22772183A 1983-11-30 1983-11-30 End mill Pending JPS60118412A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22772183A JPS60118412A (en) 1983-11-30 1983-11-30 End mill

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22772183A JPS60118412A (en) 1983-11-30 1983-11-30 End mill

Publications (1)

Publication Number Publication Date
JPS60118412A true JPS60118412A (en) 1985-06-25

Family

ID=16865309

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22772183A Pending JPS60118412A (en) 1983-11-30 1983-11-30 End mill

Country Status (1)

Country Link
JP (1) JPS60118412A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100431921B1 (en) * 2001-04-02 2004-05-22 강호연 End mill for high speed machining
EP2848343A1 (en) * 2013-09-16 2015-03-18 Franz Haimer Maschinenbau KG Milling cutter with an edge cord having a specific tooth profile

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5034388U (en) * 1973-07-24 1975-04-12
JPS5743913B2 (en) * 1975-05-01 1982-09-17

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5034388U (en) * 1973-07-24 1975-04-12
JPS5743913B2 (en) * 1975-05-01 1982-09-17

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100431921B1 (en) * 2001-04-02 2004-05-22 강호연 End mill for high speed machining
EP2848343A1 (en) * 2013-09-16 2015-03-18 Franz Haimer Maschinenbau KG Milling cutter with an edge cord having a specific tooth profile
US9616505B2 (en) 2013-09-16 2017-04-11 Franz Haimer Maschinenbau Kg Milling cutter with a cord of a special tooth profile

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