JP2510011Y2 - End mill - Google Patents
End millInfo
- Publication number
- JP2510011Y2 JP2510011Y2 JP1990088717U JP8871790U JP2510011Y2 JP 2510011 Y2 JP2510011 Y2 JP 2510011Y2 JP 1990088717 U JP1990088717 U JP 1990088717U JP 8871790 U JP8871790 U JP 8871790U JP 2510011 Y2 JP2510011 Y2 JP 2510011Y2
- Authority
- JP
- Japan
- Prior art keywords
- cutting edge
- end mill
- cutting
- axis
- regular polygon
- 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
Landscapes
- Milling Processes (AREA)
Description
【考案の詳細な説明】 産業上の利用分野 本考案はエンドミルに係り、特に、高硬度材の仕上げ
切削に好適に用いられるエンドミルに関するものであ
る。TECHNICAL FIELD The present invention relates to an end mill, and more particularly to an end mill suitable for finish cutting of a high hardness material.
従来の技術 例えばロックウェル硬さHRCが48程度以上の高硬度材
を切削加工するエンドミルは、高い耐摩耗性が要求され
ることから高速度工具鋼，超硬合金，サーメット,CBN等
の硬質材料にて構成されるとともに、切削抵抗による工
具の撓みやチッピング等を防止するために種々の対策が
講じられている。このようなエンドミルの一種に、軸心
に直角な横断面が略正多角形であるとともに、軸心方向
に進むに従ってその正多角形が軸心まわりに旋回した外
形状を成し、その正多角形の各頂点によって形成される
螺旋状の稜線によって切刃が構成されているものがあ
る。実開平２−3317号公報に記載されているエンドミル
はその一例であり、かかるエンドミルによれば比較的高
い剛性が得られて切削抵抗による変形が軽減されるとと
もに、切刃の強度が向上してチッピング等の発生が抑制
される。Conventional technology For example, end mills that cut high hardness materials with Rockwell hardness H R C of about 48 or higher require high wear resistance, so high-speed tool steel, cemented carbide, cermet, CBN, etc. In addition to being made of a hard material, various measures have been taken to prevent the tool from bending and chipping due to cutting resistance. One type of such end mill is that the cross section perpendicular to the axis is a substantially regular polygon, and the regular polygon has an outer shape that swivels around the axis as it advances in the direction of the axis. In some cases, the cutting edge is configured by a spiral ridge line formed by each vertex of a polygon. The end mill described in Japanese Utility Model Laid-Open No. 2-3317 is an example thereof. According to such an end mill, relatively high rigidity is obtained, deformation due to cutting resistance is reduced, and the strength of the cutting edge is improved. Occurrence of chipping is suppressed.
考案が解決しようとする課題 しかしながら、上述した従来のエンドミルにおいて
は、切削された仕上げ面と工具との間の隙間が狭いた
め、切屑の排出性が悪く、切屑詰まりによって切削抵抗
が増大したり仕上げ面が損なわれたりする問題があっ
た。これに対し、前記正多角形の各辺を凹状に湾曲させ
てチップポケットを形成すれば、そのチップポケット内
に切屑が収容されて上記問題を回避できるが、断面積が
減少して剛性が低下してしまうのである。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-mentioned conventional end mill, since the gap between the finished surface cut and the tool is narrow, the chip discharge performance is poor, and the cutting resistance increases due to chip clogging or finish There was a problem that the surface was damaged. On the other hand, if each side of the regular polygon is concavely curved to form a chip pocket, chips can be accommodated in the chip pocket to avoid the above problem, but the cross-sectional area is reduced and the rigidity is reduced. It does.
本考案は以上の事情を背景として為されたもので、そ
の目的とするところは、剛性を低下させることなく切屑
の排出性を向上させることにある。The present invention has been made in view of the above circumstances, and an object of the present invention is to improve chip discharge performance without lowering rigidity.
課題を解決するための手段 かかる目的を達成するために、本考案は、軸心に直角
な横断面が略正多角形であるとともに、軸心方向に進む
に従ってその正多角形が軸心まわりに旋回した外形状を
成し、その正多角形の各頂点によって形成される螺旋状
の稜線によって切刃が構成されているエンドミルにおい
て、断面形状が滑らかに湾曲した溝形のチップフォーマ
を、回転切削方向における前記切刃の前方においてその
切刃に近接してその切刃と平行に、且つ前記正多角形の
内接円よりも外側の領域内に設けたことを特徴とする。Means for Solving the Problems In order to achieve the above object, the present invention has a cross section perpendicular to the axis that is a substantially regular polygon, and that the regular polygon moves around the axis as it progresses in the axis direction. In an end mill that has a swirling outer shape and the cutting edge is composed of spiral ridges formed by the vertices of its regular polygon, a groove-shaped chip former with a smoothly curved cross-section is used for rotary cutting. It is characterized in that it is provided in front of the cutting blade in the direction, close to the cutting blade, parallel to the cutting blade, and in an area outside the inscribed circle of the regular polygon.
作用および考案の効果 このようなエンドミルにおいては、切刃によって切削
された切屑がチップフォーマにより小さくカールさせら
れるため、その切屑が仕上げ面と工具との間の小さな隙
間に良好に収容されるとともに容易に排出されるように
なり、切削抵抗が増大したり仕上げ面が損なわれたりす
ることが防止される。また、かかるチップフォーマは、
あくまでも切屑を変形させるためのもので切屑の収容を
目的とするものではないため、その深さは比較的浅くて
も差し支えなく、本考案では正多角形の内接円よりも外
側の領域内に設けられるため、チップフォーマを設ける
前と同じ心厚を維持でき、大きなチップポケットを設け
る場合に比較して剛性の低下が少なく、撓み変形などに
より加工精度の低下を招くこともない。Action and effect of the invention In such an end mill, the chips cut by the cutting edge are curled small by the tip former, so that the chips are well accommodated in the small gap between the finished surface and the tool and are easily Then, the cutting resistance is prevented from increasing and the finished surface is prevented from being damaged. Also, such a chip former is
Since it is only for deforming the chips and not for the purpose of accommodating the chips, its depth may be relatively shallow, and in the present invention, it is within the area outside the inscribed circle of the regular polygon. Since the chip former is provided, the same core thickness as that before the chip former is provided can be maintained, the rigidity is less deteriorated as compared with the case where a large chip pocket is provided, and the processing accuracy is not deteriorated due to bending deformation.
実施例 以下、本考案の一実施例を図面に基づいて詳細に説明
する。Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
第１図は本考案の一実施例であるエンドミルの正面図
であり、かかるエンドミル10は、超硬合金，サーメッ
ト，若しくはCBN等の超硬質材料にて構成されていると
ともに、フライス盤やマシニングセンタ等に把持される
シャンク部12と、そのシャンク部12と同心に一体に設け
られた刃部14とを備えている。刃部14は、軸心に直角な
横断面が第２図に示されているように正六角形で、軸心
方向に進むに従ってその正六角形が軸心まわりに旋回し
た外形状を成しており、その正六角形の各頂点によって
形成される螺旋状の稜線によって６枚の切刃16が構成さ
れている。かかる切刃16のねじれ角は、切削抵抗の軸方
向分力を考慮して例えば35°以下に設定される。なお、
第２図は第１図におけるII−II断面図である。FIG. 1 is a front view of an end mill according to an embodiment of the present invention. The end mill 10 is made of a super hard material such as cemented carbide, cermet, or CBN, and is used for a milling machine, a machining center, or the like. A shank portion 12 to be gripped and a blade portion 14 which is integrally provided concentrically with the shank portion 12 are provided. The blade portion 14 has a regular hexagonal cross section perpendicular to the axis, as shown in FIG. 2, and has an outer shape in which the regular hexagon swivels around the axis as it advances in the axis direction. The six cutting edges 16 are constituted by spiral ridge lines formed by the vertices of the regular hexagon. The twist angle of the cutting edge 16 is set to, for example, 35 ° or less in consideration of the axial component force of the cutting resistance. In addition,
FIG. 2 is a sectional view taken along line II-II in FIG.
また、上記切刃16の回転切削方向Ａにおける前側の近
傍には、断面が略円弧形状を成す溝形のチップフォーマ
18が切刃16から僅かに離間して平行に設けられている。
このチップフォーマ18の開口部の幅寸法W2は、前記正六
角形の１辺の長さW1の約1/6であり、溝深さは幅寸法W2
の1/2より小さく、第２図から明らかなように、一点鎖
線で示す内接円よりも外側の領域内に設けられている。Further, in the vicinity of the front side of the cutting edge 16 in the rotational cutting direction A, a groove-shaped chip former having a substantially arc-shaped cross section.
18 is provided in parallel with and slightly separated from the cutting edge 16.
The width W 2 of the opening of the chip former 18 is about 1/6 of the length W 1 of one side of the regular hexagon, and the groove depth is the width W 2.
2 is smaller than 1/2, and as is apparent from FIG. 2, it is provided in the area outside the inscribed circle indicated by the alternate long and short dash line.
そして、このようなエンドミル10は、シャンク部12が
フライス盤等に把持されて右まわり、すなわち回転切削
方向Ａへ回転駆動されることにより、図示しない被削材
に切削加工を施すのであるが、このエンドミル10の刃先
径d1に対する心厚d2の割合は大きいため、高い剛性が得
られる。また、軸心と直角な断面における切刃16の先端
角は120°であるため、高い強度が得られる。したがっ
て、かかるエンドミル10によれば、高硬度材に対して良
好な切削加工を行うことができる。Then, in such an end mill 10, the shank portion 12 is gripped by a milling machine or the like and driven to rotate in the clockwise direction, that is, in the rotary cutting direction A, thereby performing cutting on a work material (not shown). Since the ratio of the core thickness d 2 to the cutting edge diameter d 1 of the end mill 10 is large, high rigidity can be obtained. Further, since the tip angle of the cutting edge 16 in the cross section perpendicular to the axis is 120 °, high strength can be obtained. Therefore, according to the end mill 10, it is possible to perform excellent cutting on the high hardness material.
なお、刃先径d1に対する心厚d2の割合は、本実施例で
は断面が正六角形であるため約87％であるが、八角形や
十角形など角数が多い程その割合は大きくなり、より高
い剛性が得られるようになる。The ratio of the core thickness d 2 to the cutting edge diameter d 1 is about 87% because the cross section is a regular hexagon in this embodiment, but the ratio increases as the number of angles such as octagon and decagon increases. Higher rigidity can be obtained.
一方、本実施例では切刃16と平行にチップフォーマ18
が設けられ、切刃16によって切削された切屑がそのチッ
プフォーマ18内に入り込んで小さくカールさせられるよ
うになっているため、その切屑が仕上げ面と工具との間
の小さな隙間に良好に収容されるとともに容易に排出さ
れるようになり、切削抵抗が増大したり仕上げ面が損な
われたりすることが防止される。上記仕上げ面と工具と
の間の隙間は、具体的には（d1−d2）/2であり、断面の
角数が多くなる程小さくなる。On the other hand, in the present embodiment, the chip former 18 is arranged parallel to the cutting edge 16.
Is provided so that the chips cut by the cutting edge 16 enter the chip former 18 and are curled small, so that the chips are well accommodated in the small gap between the finishing surface and the tool. In addition, it is easily discharged and prevents the cutting resistance from increasing and the finished surface from being damaged. The gap between the finished surface and the tool is specifically (d 1 −d 2 ) / 2, and becomes smaller as the number of corners of the cross section increases.
また、上記チップフォーマ18は、あくまでも切屑を変
形させるためのもので切屑の収容を目的とするものでは
なく、開口部の幅寸法W2が正多角形の１辺の長さW1の1/
6程度であるとともに溝深さも浅く、正六角形の内接円
よりも外側の領域内に設けられているため、かかるチッ
プフォーマ18を設ける前と同じ心厚d2を維持でき、大き
なチップポケットを設ける場合に比較して剛性の低下が
少なく、撓み変形などにより加工精度の低下を招くこと
もない。Further, the chip former 18 is for deforming chips only and is not intended for accommodating chips, and the width dimension W 2 of the opening is 1 / the length W 1 of one side of the regular polygon.
Since the groove depth is about 6 and the groove depth is shallow, and it is provided in the region outside the inscribed circle of the regular hexagon, the same core thickness d 2 as before the chip former 18 was provided can be maintained, and a large chip pocket can be created. The rigidity is less deteriorated as compared with the case where it is provided, and the processing accuracy is not deteriorated due to bending deformation.
なお、上述したのはあくまでも本考案の一具体例であ
り例えば切刃の先端角が小さくなるように切刃に連続し
て溝形のチップフォーマを設けることも可能であるな
ど、本考案は当業者の知識に基づいて種々の変更，改良
を加えた態様で実施することができる。The above description is merely a specific example of the present invention.For example, a groove-shaped tip former may be provided continuously to the cutting edge so that the tip angle of the cutting edge becomes small. It can be implemented in various modified and improved modes based on the knowledge of the trader.
第１図は本考案の一実施例である断面が六角形のエンド
ミルの正面図である。第２図は第１図におけるII−II断
面図である。 10:エンドミル、16:切刃、18:チップフォーマ A:回転切削方向FIG. 1 is a front view of an end mill having a hexagonal cross section, which is an embodiment of the present invention. FIG. 2 is a sectional view taken along line II-II in FIG. 10: End mill, 16: Cutting edge, 18: Tip former A: Rotary cutting direction
Claims (1)
ともに、軸心方向に進むに従って該正多角形が軸心まわ
りに旋回した外形状を成し、該正多角形の各頂点によっ
て形成される螺旋状の稜線によって切刃が構成されてい
るエンドミルにおいて、 断面形状が滑らかに湾曲した溝形のチップフォーマを、
回転切削方向における前記切刃の前方において該切刃に
近接して該切刃と平行に、且つ前記正多角形の内接円よ
りも外側の領域内に設けたことを特徴とするエンドミ
ル。1. A cross section perpendicular to the axis is a substantially regular polygon, and the regular polygon has an outer shape that is swiveled around the axis as it advances in the direction of the axis, and each of the regular polygons is formed. In an end mill where the cutting edge is composed of spiral ridges formed by the vertices, a groove-shaped tip former with a smoothly curved cross-sectional shape
An end mill provided in front of the cutting edge in the rotational cutting direction, in proximity to the cutting edge, in parallel with the cutting edge, and in an area outside an inscribed circle of the regular polygon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990088717U JP2510011Y2 (en) | 1990-08-23 | 1990-08-23 | End mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990088717U JP2510011Y2 (en) | 1990-08-23 | 1990-08-23 | End mill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0445618U JPH0445618U (en) | 1992-04-17 |
| JP2510011Y2 true JP2510011Y2 (en) | 1996-09-11 |
Family
ID=31822180
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990088717U Expired - Fee Related JP2510011Y2 (en) | 1990-08-23 | 1990-08-23 | End mill |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2510011Y2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH042743Y2 (en) * | 1986-09-11 | 1992-01-30 | ||
| JP2523508Y2 (en) * | 1988-06-14 | 1997-01-29 | 日立ツール 株式会社 | End mill for tapered groove processing |
-
1990
- 1990-08-23 JP JP1990088717U patent/JP2510011Y2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0445618U (en) | 1992-04-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |