WO2010084805A1 - ラジアスエンドミル - Google Patents
ラジアスエンドミル Download PDFInfo
- Publication number
- WO2010084805A1 WO2010084805A1 PCT/JP2010/050254 JP2010050254W WO2010084805A1 WO 2010084805 A1 WO2010084805 A1 WO 2010084805A1 JP 2010050254 W JP2010050254 W JP 2010050254W WO 2010084805 A1 WO2010084805 A1 WO 2010084805A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- blade
- corner
- end mill
- rake face
- axis
- Prior art date
Links
Images
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
- B23C5/00—Milling-cutters
- B23C5/02—Milling-cutters characterised by the shape of the cutter
-
- 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
- B23C2210/084—Curved cutting edges
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T407/00—Cutters, for shaping
- Y10T407/19—Rotary cutting tool
- Y10T407/1946—Face or end mill
- Y10T407/1948—Face or end mill with cutting edge entirely across end of tool [e.g., router bit, end mill, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T407/00—Cutters, for shaping
- Y10T407/19—Rotary cutting tool
- Y10T407/1952—Having peripherally spaced teeth
- Y10T407/1962—Specified tooth shape or spacing
- Y10T407/1964—Arcuate cutting edge
Definitions
- a main gash surface is formed on the inner peripheral side of the tip of the wall surface of the chip discharge groove facing the tool rotation direction, and a bottom blade is formed at the tip of the main gash surface.
- a sub-gash surface is formed on the outer peripheral side of the main gash surface so as to recede from the main gash surface through a stepped portion.
- an arcuate corner blade formed so as to be continuous with the outer peripheral side of the bottom blade.
- a gash is formed at the tip of the chip discharge groove, and a bottom continuous from the outer peripheral blade through the corner R blade to the tip side ridge portion of the wall surface facing the end mill rotation direction of the gasche.
- a radius end mill is proposed in which a blade is formed, the wall surface facing the end mill rotation direction of the gasche is made flat, and the intersecting ridge line with the wall surface facing the end mill rotation direction of the chip discharge groove intersects the corner R blade.
- the main gash surface and the sub gash surface are provided with a stepped portion, or the planar wall surface facing the end mill rotation direction of the gash is the end mill rotation direction of the chip discharge groove. Since the intersecting ridge line with the wall facing the corner intersects the corner R blade, the chips can be divided by these stepped portions and the intersecting ridge line, and the chip disposability can be improved.
- the present invention has been made under such a background, and prevents the corner blade from being damaged due to a change in the cutting edge strength of the corner blade or a variation in load during cutting, and prevents deterioration of the machined surface roughness.
- the aim is to provide a possible radius end mill.
- the radius end mill of the present invention has a chip discharge groove formed on the outer periphery of a tip end portion of an end mill body rotated about an axis, and the end mill of the chip discharge groove.
- the outer peripheral side of the tip of the wall facing the rotation direction is a corner blade rake surface, and the corner ridge portion of this corner blade rake surface forms a convex arc shape in which the rotation locus around the axis is convex toward the outer periphery of the tip.
- the corner blade is located on the radially inner side with respect to the axial line from the center of the convex arc formed by the corner blade, and extends from the rear end side in the axial direction than the protruding end of the corner blade in the axial direction.
- intersection of the bottom blade and the corner blade, and the intersection line of the bottom blade rake surface and the corner blade rake surface extending from the intersection to the rear end side are used exclusively for cutting of the corner blade. It is no longer located at the 1/4 arc portion from the protruding end in the axial direction to the outer peripheral end.
- the rake angle or the like does not change abruptly in the portion of the corner blade that is exclusively used for cutting, and accordingly, the cutting load and cutting force acting on the corner blade are prevented.
- the blade strength does not vary extremely, and the corner blade can be prevented from being damaged.
- the intersection line between the bottom edge rake face and the corner edge rake face does not intersect with the portion used for cutting the corner edge in this way, it is less likely that chips are generated across the intersection line. No streak-like marks are left on the machined surface, and even if a mark is left, it can be cut off around the edge of the corner blade that protrudes to the tip end in the axial direction from this intersection line. It is possible to improve the height.
- the tip of the intersection line between the corner blade rake face and the bottom blade rake face is radially inward with respect to the axis from the center of the convex arc formed by the corner blade in the rotation locus around the axis.
- the difference between the radial length from the axis to the center of the convex arc formed by the corner blade and the radial length from the axis to the tip of the intersection line is 0.1 mm.
- it is desirable that the rotation trajectory around the axis is within the range of 0.2 mm + 0.2 ⁇ R or less with respect to the radius R (mm) of the convex arc formed by the corner blade.
- the tip of the line of intersection may be too close to the tip of the corner blade, and the above effect may not be reliably achieved.
- the convex arc formed by the corner blade When it is longer than 0.2 mm + 0.2 ⁇ R with respect to the radius R (mm), the sharpness of the bottom blade may be lowered.
- the present invention it is possible to prevent a portion where the rake angle or the like changes suddenly in a radius end mill in a range where the corner blade is exclusively used, and it is possible to prevent cutting edge strength and cutting load.
- the corner blade By preventing the variation, it is possible to prevent the corner blade from being damaged and extend the end mill life, and to prevent the streak-like marks from remaining on the processed surface, thereby improving the processed surface roughness.
- the end mill body 1 is integrally formed in a substantially cylindrical shaft shape centering on the axis O with a hard material such as cemented carbide, and the rear end side (the right side in FIGS. 1 and 2) is the end mill body 1.
- the end mill is a shank portion 2 for mounting on the spindle of the machine tool, and a cutting edge portion 3 on the tip side (left side in FIGS. 1 and 2). The workpiece is cut by the cutting edge portion 3 by being sent out while being rotated in the rotation direction.
- a gash 7 is formed so that the tip side opening of each chip discharge groove 4 is sharpened to the inner peripheral side at the tip part of this cutting edge part 3, that is, the most distal part of the end mill body 1.
- the wall surface facing the end mill rotation direction T side of the gasche 7 is a bottom edge rake surface 8, and the bottom side ridge portion extends to the vicinity of the axis O in the radial direction with respect to the axis O.
- a blade 9 is formed.
- the bottom blade rake face 8 is formed so as to have an inclination angle that is gentler than the twist angle formed by the chip discharge groove 4 and the outer peripheral blade 6 with respect to the axis O. An axial rake angle smaller than the twist angle of the outer peripheral blade 6 is given.
- the bottom blade 9 is formed in a linear shape inclined so as to be directed toward the rear end side at a slight angle toward the radially inner peripheral side.
- the outer peripheral blade scoop surface 5 and the bottom A concave portion 10 is formed so as to further cut out a portion where the blade rake face 8 intersects.
- the wall surface of the recess 10 facing the end mill rotation direction T is a corner blade rake surface 11.
- the edge of the corner blade rake surface 11 on the outer peripheral side of the tip is the outer edge of the outer blade 6 and the outer edge of the bottom blade 9.
- the corner blade 12 is formed in a circle C having a center S on the rake face 8 of the bottom blade in the present embodiment as shown in FIG. A convex arc shape that protrudes toward the outer peripheral side of the tip.
- intersection line L between the corner edge rake face 11 and the bottom edge rake face 8 formed so as to intersect the obtuse angle as described above is such that the rotation locus around the axis O forms a convex arc shape.
- the corner blade 12 extends slightly from the rear end side in the direction of the axis O with respect to the protrusion P in the direction of the axis O, that is, the intersection point Q between the bottom blade 9 and the corner blade 12 which is the tip of the intersection line L. Is positioned slightly on the rear end side in the axis O direction with respect to the protruding end P.
- the intersection line L has a diameter with respect to the axis O rather than the center (the center of the circle C) S of the convex arc formed by the corner Q 12 at the rotation trajectory around the axis O.
- the corner blade 12 is on a straight line passing through the center S and parallel to the axis O while drawing a convex arc from the intersection with the outer peripheral blade 6 toward the inner periphery of the tip. It extends to reach the intersection point Q with the bottom blade 9 so as to reach the protruding end P, and beyond the protruding end P, further toward the inner peripheral side while slightly protruding toward the inner peripheral side while leaving a convex arc shape.
- intersection line L extends slightly from the intersection point Q toward the rear end side, and then intersects the intersection line between the corner blade rake face 11 and the wall surface 13 of the recess 10, and the wall face 13 and the bottom blade rake face 8. It is made to continue with the above-mentioned ridgeline.
- the radius end mill configured as described above is rotated around the axis O as described above and is fed in a direction intersecting the axis O, so that the corner blade 12 at the cutting edge portion 3 is protruded exclusively in the axis O direction.
- a processed surface such as a concave curved surface is formed on a work material such as a die by a 1 ⁇ 4 arc portion from P to the outer peripheral end.
- the corner blade 12 and the bottom blade are formed. 9 is located on the rear end side in the direction of the axis O with respect to the protrusion P, and an intersection line L between the bottom edge rake face 8 and the corner edge rake face 11 extends from the intersection Q to the rear end side.
- the corner blade 12 is formed so as to wrap around the rear end side of the inner periphery beyond the projecting end P.
- the bottom edge rake face 8 and the corner edge rake face 11 are formed in a portion exclusively used for cutting in this way.
- the intersection line L of There is no.
- chips are generated so as to straddle the intersection point Q and the intersection line L, and extend so as to scrape both the bottom edge rake face 8 and the corner edge rake face 11 that are bent at an obtuse angle with the intersection line L as a boundary.
- the chips generated by the corner blade 12 flow on the corner blade rake face 11 that is uniformly continuous, it is possible to avoid variation in the cutting load acting on the end mill body 1 from the cutting edge.
- the corner blade rake face 11 of the corner blade 12 used for cutting in this way is continuous without being bent at an angle, so that the cutting edge strength of the corner blade 12 is increased. Can be maintained without any extreme variation over the entire length, and thus the cutting load and the strength of the cutting edge can be stabilized in this manner, thereby preventing the corner blade 12 from being damaged or the like. It is possible to provide a long-life radius end mill.
- intersection point Q with the bottom blade 9 and the intersection line L with the bottom blade rake face 8 are formed on the corner blade 12 and the corner blade rake face 11 of the 1 ⁇ 4 arc portion to be used. Therefore, the above-mentioned intersection point Q and intersection line L are not cut into the work material during cutting, and the trace generated by dividing the chips by the intersection point Q and intersection line L is the work material. No streaks are left on the processed surface. For this reason, according to the radius end mill having the above-described configuration, it is possible to improve the roughness of the machining surface formed on the work material and the accuracy of the machining surface, and to promote high-quality cutting.
- the chips generated by the 1 ⁇ 4 arc portion of the corner blade 12 flow out toward the center S of the convex arc (center of the circle C) S regardless of the portion generated at any portion. It is made to collide with the wall surface 13 and receive resistance to be curled and divided and processed.
- the streak-like mark on the bottom surface as the end mill body 1 is fed. Is cut so that the periphery of the tip P of the corner blade 12 is exposed, and as a result, such a mark is not left on the bottom surface. Therefore, even in the case of such processing, it is possible to obtain a high processing accuracy by finishing the bottom surface smoothly.
- the corner blade 12 when the radius R of the convex arc formed by the corner blade 12 is small, if the radial distance between the intersection Q and the tip P is too large, the corner blade 12 will pass over the tip P to the inner peripheral side.
- the bottom blade 9 intersects with the corner blade 12 at the intersection point Q when it goes back and greatly retreats to the rear end side, that is, the bottom blade 9 is retreated excessively with respect to the projecting end P of the corner blade 12 to reduce the sharpness. May occur.
- the radial distance between the protruding end P of the corner blade 12 and the intersection point Q, which is the tip of the intersection line L between the corner blade rake face 11 and the bottom blade rake face 8, is from the axis O as described above.
- the difference AB between the radial length A to the center S of the convex arc formed by the corner blade 12 and the radial length B from the axis O to the intersection point Q which is the tip of the intersection line L is 0. It is preferably 1 mm or more, but within a range of 0.2 mm + 0.2 ⁇ R with respect to the radius R (mm).
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Milling Processes (AREA)
Abstract
Description
3 切刃部
4 切屑排出溝
6 外周刃
7 ギャッシュ
8 底刃すくい面
9 底刃
10 凹部
11 コーナ刃すくい面
12 コーナ刃
O エンドミル本体1の軸線
L 底刃すくい面8とコーナ刃すくい面11との交線
P コーナ刃12の突端
Q 底刃9とコーナ刃12との交点(交線Lの先端)
R コーナ刃12が軸線O回りの回転軌跡においてなす凸円弧の半径
S コーナ刃がなす凸円弧の中心(凸円弧が沿う円Cの中心)
A 軸線Oから中心Sまでの径方向の長さ
B 軸線Oから交点Qまでの径方向の長さ
Claims (2)
- 軸線回りに回転されるエンドミル本体の先端部外周に切屑排出溝が形成され、この切屑排出溝のエンドミル回転方向を向く壁面の先端外周側はコーナ刃すくい面とされて、このコーナ刃すくい面の辺稜部には上記軸線回りの回転軌跡が先端外周側に向けて凸となる凸円弧状をなすコーナ刃が形成されるとともに、上記コーナ刃すくい面の内周側にはギャッシュが形成され、このギャッシュのエンドミル回転方向を向く壁面は底刃すくい面とされて、この底刃すくい面の先端側辺稜部には、上記コーナ刃に連なり内周側に向けて延びる底刃が形成されており、上記コーナ刃すくい面と底刃すくい面との交線は、その先端が、上記軸線回りの回転軌跡において上記コーナ刃がなす凸円弧の中心よりも該軸線に対する径方向内周側に位置して、上記コーナ刃の上記軸線方向における突端よりも該軸線方向において後端側から延びていることを特徴とするラジアスエンドミル。
- 上記軸線から上記コーナ刃がなす凸円弧の中心までの径方向の長さと、上記軸線から上記交線の先端までの径方向の長さとの差が、0.1mm以上で、かつ上記軸線回りの回転軌跡において上記コーナ刃がなす凸円弧の半径R(mm)に対して0.2mm+0.2×R以下の範囲内とされていることを特徴とする請求項1に記載のラジアスエンドミル。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/138,126 US8556547B2 (en) | 2009-01-21 | 2010-01-13 | Radius end mill |
CN201080003792.8A CN102264496B (zh) | 2009-01-21 | 2010-01-13 | 圆弧头立铣刀 |
EP10733412.0A EP2383060B1 (en) | 2009-01-21 | 2010-01-13 | Radius end mill |
KR1020117017027A KR101625700B1 (ko) | 2009-01-21 | 2010-01-13 | 라디우스 엔드 밀 |
HK12102486.3A HK1161997A1 (en) | 2009-01-21 | 2012-03-12 | Radius end mill |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009011047A JP5731102B2 (ja) | 2009-01-21 | 2009-01-21 | ラジアスエンドミル |
JP2009-011047 | 2009-01-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010084805A1 true WO2010084805A1 (ja) | 2010-07-29 |
Family
ID=42355859
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2010/050254 WO2010084805A1 (ja) | 2009-01-21 | 2010-01-13 | ラジアスエンドミル |
Country Status (7)
Country | Link |
---|---|
US (1) | US8556547B2 (ja) |
EP (1) | EP2383060B1 (ja) |
JP (1) | JP5731102B2 (ja) |
KR (1) | KR101625700B1 (ja) |
CN (1) | CN102264496B (ja) |
HK (1) | HK1161997A1 (ja) |
WO (1) | WO2010084805A1 (ja) |
Cited By (2)
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---|---|---|---|---|
JP5016737B1 (ja) * | 2011-06-17 | 2012-09-05 | 日立ツール株式会社 | 多刃エンドミル |
WO2012172710A1 (ja) * | 2011-06-17 | 2012-12-20 | 日立ツール株式会社 | 多刃エンドミル |
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US8647025B2 (en) | 2011-01-17 | 2014-02-11 | Kennametal Inc. | Monolithic ceramic end mill |
US9707627B2 (en) * | 2011-12-27 | 2017-07-18 | Kyocera Corporation | Radius end mill |
US9555486B2 (en) | 2012-07-27 | 2017-01-31 | Mitsubishi Hitachi Tool Engineering, Ltd. | Multi-flute endmill |
US8858128B2 (en) | 2012-11-14 | 2014-10-14 | Iscar, Ltd. | Corner radius end mill |
US20140356081A1 (en) * | 2013-05-30 | 2014-12-04 | Kennametal Inc. | End mill with high ramp angle capability |
CN103286364A (zh) * | 2013-06-28 | 2013-09-11 | 哈尔滨理工大学 | 一种平坦曲面加工用圆弧顶铣削刀具 |
CN105682837B (zh) * | 2013-11-08 | 2018-02-02 | 三菱日立工具技术株式会社 | 圆弧立铣刀以及切削加工方法 |
IL232079B (en) | 2014-04-10 | 2018-05-31 | Hanita Metal Works Ltd | A cutting tool with improved chip removal capability and a method for its preparation |
USD774573S1 (en) | 2014-04-10 | 2016-12-20 | Kennametal Inc | Cutting tool with W-shaped flute gully |
CN104259540B (zh) * | 2014-09-11 | 2017-02-22 | 株洲钻石切削刀具股份有限公司 | 一种平头立铣刀 |
US9517515B2 (en) * | 2014-09-15 | 2016-12-13 | Iscar, Ltd. | End mill convex radial relief surface and corner having circular arc profile |
US9878379B2 (en) | 2015-04-22 | 2018-01-30 | Kennametal Inc. | Cutting tool with enhanced chip evacuation capability and method of making same |
US10131003B2 (en) * | 2015-11-23 | 2018-11-20 | Iscar, Ltd. | Cemented carbide corner radius end mill with continuously curved rake ridge and helical flute design |
US11000906B2 (en) | 2016-06-30 | 2021-05-11 | Ngk Spark Plug Co., Ltd. | Endmill body and radius end mill |
KR102133164B1 (ko) * | 2016-08-26 | 2020-07-13 | 미츠비시 히타치 쓰루 가부시키가이샤 | 절삭 인서트 및 날끝 교환식 회전 절삭 공구 |
JP7075584B2 (ja) * | 2018-04-16 | 2022-05-26 | 三菱重工業株式会社 | ラジアスエンドミル及びこれを用いた工作機械、並びにラジアスエンドミルの設計方法及び加工方法 |
IL264757B (en) * | 2019-02-10 | 2022-07-01 | Hanita Metal Works Ltd | Milling with independent diagonal surfaces |
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2009
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2010
- 2010-01-13 US US13/138,126 patent/US8556547B2/en active Active
- 2010-01-13 EP EP10733412.0A patent/EP2383060B1/en active Active
- 2010-01-13 WO PCT/JP2010/050254 patent/WO2010084805A1/ja active Application Filing
- 2010-01-13 CN CN201080003792.8A patent/CN102264496B/zh active Active
- 2010-01-13 KR KR1020117017027A patent/KR101625700B1/ko active IP Right Grant
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2012
- 2012-03-12 HK HK12102486.3A patent/HK1161997A1/xx unknown
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5016737B1 (ja) * | 2011-06-17 | 2012-09-05 | 日立ツール株式会社 | 多刃エンドミル |
WO2012172710A1 (ja) * | 2011-06-17 | 2012-12-20 | 日立ツール株式会社 | 多刃エンドミル |
JP2013018110A (ja) * | 2011-06-17 | 2013-01-31 | Hitachi Tool Engineering Ltd | 多刃エンドミル |
EP2722121A1 (en) * | 2011-06-17 | 2014-04-23 | Hitachi Tool Engineering, Ltd. | Multi-edge endmill |
CN103764326A (zh) * | 2011-06-17 | 2014-04-30 | 日立工具股份有限公司 | 多刃立铣刀 |
EP2722121A4 (en) * | 2011-06-17 | 2015-01-21 | Hitachi Tool Eng | CYLINDRICAL STRAWBER TWO SIZES WITH MULTIPLE HORNS |
US9579734B2 (en) | 2011-06-17 | 2017-02-28 | Mitsubishi Hitachi Tool Engineering, Ltd. | Multi-flute endmill |
KR101746483B1 (ko) | 2011-06-17 | 2017-06-13 | 미츠비시 히타치 쓰루 가부시키가이샤 | 다날 엔드밀 |
Also Published As
Publication number | Publication date |
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EP2383060A4 (en) | 2013-10-16 |
JP2010167520A (ja) | 2010-08-05 |
US20110268513A1 (en) | 2011-11-03 |
CN102264496B (zh) | 2014-05-28 |
US8556547B2 (en) | 2013-10-15 |
EP2383060A1 (en) | 2011-11-02 |
EP2383060B1 (en) | 2016-08-17 |
CN102264496A (zh) | 2011-11-30 |
JP5731102B2 (ja) | 2015-06-10 |
KR20110104531A (ko) | 2011-09-22 |
KR101625700B1 (ko) | 2016-05-30 |
HK1161997A1 (en) | 2012-08-17 |
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