WO2015072389A1 - ラフィングエンドミル - Google Patents
ラフィングエンドミル Download PDFInfo
- Publication number
- WO2015072389A1 WO2015072389A1 PCT/JP2014/079427 JP2014079427W WO2015072389A1 WO 2015072389 A1 WO2015072389 A1 WO 2015072389A1 JP 2014079427 W JP2014079427 W JP 2014079427W WO 2015072389 A1 WO2015072389 A1 WO 2015072389A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- end mill
- blade
- outer peripheral
- luffing
- roughing
- Prior art date
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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
- B23C5/003—Milling-cutters with vibration suppressing means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2210/00—Details of milling cutters
- B23C2210/04—Angles
- B23C2210/0407—Cutting angles
- B23C2210/0414—Cutting angles different
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2210/00—Details of milling cutters
- B23C2210/20—Number of cutting edges
- B23C2210/202—Number of cutting edges three
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2210/00—Details of milling cutters
- B23C2210/20—Number of cutting edges
- B23C2210/203—Number of cutting edges four
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2210/00—Details of milling cutters
- B23C2210/48—Chip breakers
- B23C2210/486—Chip breaking grooves or depressions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2220/00—Details of milling processes
- B23C2220/60—Roughing
Definitions
- the length in the axial direction of the straight portions of all the outer peripheral blades may be not more than twice the pitch of the waveform in the luffing portion. If the outer peripheral blade is so long that the length of the straight line in the axial direction exceeds twice the corrugated pitch of the roughing part, the vibration suppression effect by the roughing part during rough machining is impaired and the surface accuracy deteriorates. As a result, the finished surface accuracy may be deteriorated.
- the apex in the radial direction with respect to the axial line of the most advanced convex portion is the radial direction of the corner blade. If it is matched with the vertex, the length of the straight line portion is zero.
- the corner tangent and the end mill are intersected at an angle with the tangent of the corner blade in the radial direction when viewed from the end mill rotation direction, or the corner blade radial vertex and the end mill Even if it is connected by the linear portion extending linearly as viewed from the rotation direction and intersected with the linear portion at an angle, the inclination angle with respect to the tangent of the vertex in the radial direction of the corner blade or the linear portion If the inclination angle is 10 ° or less, it is possible to prevent the corners from becoming sharp and prevent the occurrence of defects or the like.
- the convex part may form a convex curve
- the vertex may be in contact with the corner blade or the straight part
- the inclination angle may be 0 °.
- the end mill body 1 is formed of a hard material such as cemented carbide and has a substantially cylindrical shape centered on the axis O, and its rear end (upper right portion in FIG. 1, upper portion in FIG. 2). Is a cylindrical shank portion 2 and a tip portion (lower left portion in FIG. 1, lower portion in FIG. 2) is a cutting edge portion 3.
- the shank portion 2 is gripped by the main spindle of the machine tool and rotated in the end mill rotation direction T around the axis O, while being sent obliquely to the direction perpendicular to the axis O or the axis O. Cutting of molds and the like.
- the bottom blade 7 includes a long bottom blade 7A, 7C extending from the vicinity of the axis O to the outer peripheral side of the end mill body 1 as shown in FIG. 3, and an axial line O than the long bottom blade 7A, 7C.
- short bottom blades 7B, 7D extending from positions spaced apart on the outer peripheral side are alternately formed in the circumferential direction.
- the distance in the circumferential direction between the long bottom blades 7A and 7C and the short bottom blades 7B and 7D adjacent to the end mill rotation direction T side is the long bottom blade 7C adjacent to the short bottom blades 7B and 7D and the end mill rotation direction T side.
- the convex curve formed by the convex portion 9A of the luffing portion 9 in the present embodiment is a portion extending from the apex 9C that protrudes most in the radial direction with respect to the axis O when viewed from the end mill rotation direction T side to the tip end side of the end mill body 1.
- These vertices are formed so as to have a larger radius of curvature than the portion extending from the vertex 9C to the rear end side, and are asymmetric with respect to the vertex 9C.
- a convex portion 9A is directed from one outer peripheral blade 5 to the outer peripheral blade 5 adjacent to the end mill rotation direction T side in FIGS.
- the length L of all the peripheral blades 5 in the direction of the axis O of the linear portion 10 is set to be twice or less the waveform pitch P in the luffing portion 9.
- the straight portion 10 having the longest length L in the direction of the axis O of the outer peripheral blade 5 shown in FIG. 4D is made equal to the pitch P of the luffing portion 9, that is, all the outer periphery
- a length L of the straight portion 10 of the blade 5 in the direction of the axis O is set to be equal to or less than the waveform pitch P in the luffing portion 9.
- the outer peripheral blade 5 of the outer peripheral blade 5 in which the most advanced convex portion 9A of the roughing portion 9 is located closest to the front end side in the axis O direction is the radial direction of the most advanced convex portion 9A.
- the other outer peripheral blade 5 is also the vertex 9C of the leading edge convex portion 9A of each luffing portion 9 and the vertex 8A of the corner blade 8.
- the concave portion 9B of the luffing portion 9 does not intersect with the corner blade 8 in all the outer peripheral blades 5 so that corner portions are not formed.
- the length L of the longest straight portion 10 is set to be twice or less the pitch P in this way, but the length L of the shortest straight portion 10 may be zero. That is, among the plurality of outer peripheral blades 5, the outermost cutting edge 9A in which the leading edge convex portion 9A of the luffing portion 9 is located closest to the distal end side in the axis O direction is the most with respect to the axis O of the leading edge convex portion 9A.
- the apex 9C protruding to the outer peripheral side in the radial direction is matched with the apex 8A protruding to the outermost radial direction of the corner blade 8 connected to the tip side of the outer peripheral blade 5, and the convex portion 9A and the corner blade 8 are formed.
- the convex curve formed may touch these vertices 9C and 8A. Even in this case, since the corner portion is not formed, the above-described effect can be obtained.
- the radius of the apex 9C of the convex portion 9A other than the leading edge is in the range M up to 0.04 mm, it may be made smaller than the radius from the axis O of the apex 9C of the leading convex portion 9A. . If the radius of the apex 9C of the convex portion 9A other than the leading edge is smaller than this range M, the machining efficiency may be lowered and the finished surface accuracy may be deteriorated due to an increase in the machining allowance during finishing as described above. However, if it is a small range M up to 0.04 mm, it is possible to suppress the occurrence of an unnecessarily large uncut residue.
- the clearance angle of the outer peripheral blade 5 at the straight portion 10 is equal to the clearance angle at the luffing portion 9 or smaller than the clearance angle at the luffing portion 9 in the range up to 2 °.
- the straight portions 10 and the luffing portions 9 have the same clearance angle.
- the straight line portion 10 is used for cutting along with the corner blade 8 at the time of finishing, and particularly protrudes from the convex portion 9A other than the leading edge of the luffing portion 9 as in the modification shown in FIG.
- the flank of the straight portion 10 has a cylindrical surface shape having an outer diameter equal to the outer diameter of the outer peripheral blade in the straight portion 10, and the center line of this cylindrical surface is decentered from the axis O in parallel with the axis O. It may be a so-called eccentric flank (second surface) that provides a clearance angle.
- the most advanced convex part 9A in the luffing part 9 of each outer peripheral blade 5 is formed in a convex curve shape, and is in contact with the straight line part 10 at the radial apex 9C with respect to the axis O.
- the inclination angle of the convex curve formed by the convex portion 9A at the apex 9C with respect to the straight line portion 10 is 0 °.
- the concave portion of the roughing portion is a corner blade. Unless sharp corners are formed by crossing, the most advanced convex part 9A intersects the straight line part 10 at an angle as in the modification shown in FIG.
- an outer peripheral blade (outer peripheral blade shown in FIG. 6A) 5 in which the most advanced convex portion 9A of the luffing portion 9 among the outer peripheral blades 5 is located closest to the front end side in the axis O direction.
- the tip 9C in the radial direction with respect to the axis O of the most advanced convex portion 9A is connected to the vertex 8A in the radial direction of the corner blade 8 by the straight portion 10 extending linearly when viewed from the end mill rotation direction T.
- the outer peripheral blade (the outer peripheral blade shown in FIGS.
- the twist angles of the plurality of outer peripheral blades 5 may be all different, and in the first embodiment in which an even number of outer peripheral blades 5 are formed, the outer peripheral blades 5 adjacent to each other in the circumferential direction.
- the twist angles of the outer peripheral blades 5 every other circumferential direction may be equal. Note that, in the roughing portion 9 of the outer peripheral blade 5 that is uneven in the waveform, the angle with respect to the axis O of the twist line connecting the vertices 9C of the convex portion 9A may be the twist angle.
- the luffing end mill used in this example and the comparative example has the same specifications, the outer diameter of the outer peripheral blade 5 is 10 mm, the number of blades is 4, the twist angle is 45 °, the twist angle is equal, the blade length is 22 mm, and the clearance is The angle 9 °, the corrugated pitch P of the luffing part 9 is 1.2 mm, the radius of the corner blade 8 is 0.5 mm, the material of the end mill body 1 is cemented carbide, and the surface thereof is (Al, Cr). A hard film made of N is coated with an average film thickness of 3 ⁇ m.
- the end mill main body 1 is not damaged or vibrated, and the finished surface roughness is the maximum height in the example 1.
- Good results were obtained with Rz of 1.38 ⁇ m, Example 2 with a maximum height Rz of 1.71 ⁇ m, and Example 3 with a maximum height Rz of 2.20 ⁇ m.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Milling Processes (AREA)
Abstract
Description
本願は、2013年11月12日に日本で出願された特願2013-233970号に基づき優先権を主張し、その内容をここに援用する。
ただし、直線部10の逃げ角が2°を超えてラフィング部9の逃げ角より小さくなると、逃げ面摩耗が促進されて却ってその寿命が短縮されるおそれがある。なお、直線部10の逃げ面は、該直線部10における外周刃の外径と等しい外径の円筒面状をなし、この円筒面の中心線が軸線Oと平行に該軸線Oから偏心させられていることにより逃げ角が与えられる、いわゆる偏心逃げ面(二番面)であってもよい。
従って、産業上の利用可能性を有する。
2 シャンク部
3 切刃部
4 切屑排出溝
5 外周刃
6 ギャッシュ
7 底刃
8 コーナ刃
8A コーナ刃8の径方向の頂点
9 ラフィング部
9A ラフィング部9の凸部
9B ラフィング部9の凹部
9C ラフィング部9の凸部9Aの径方向の頂点
10 直線部
O エンドミル本体1の軸線
T エンドミル回転方向
P ラフィング部9における波形のピッチ
L 直線部10の軸線O方向における長さ
M 外周刃5のラフィング部9における最先端以外の凸部9Aの軸線Oに対する径方向の頂点9Cの軸線Oからの半径が、最先端の凸部9Aの頂点9Cの軸線Oからの半径よりも小さくされた範囲
θ エンドミル回転方向Tから見たときのラフィング部9の最先端の凸部9Aの直線部10に対する傾斜角
Claims (5)
- 軸線回りに回転されるエンドミル本体の先端部外周に上記軸線方向に延びる複数条の切屑排出溝が周方向に間隔をあけて形成されるラフィングエンドミルであって、
これらの切屑排出溝のエンドミル回転方向を向く壁面の外周側辺稜部に形成された外周刃と、上記壁面の先端側辺稜部には形成された底刃と、上記外周刃と底刃とが交差するコーナ部に、上記エンドミル本体の先端外周側に凸となる凸曲線状に形成されたコーナ刃と、を備え、
上記外周刃には、上記エンドミル回転方向から見て波形に凹凸するラフィング部が、周方向に隣接する外周刃同士で凹凸の位相をずらすようにして形成されていて、
上記外周刃のうち上記ラフィング部の最先端の凸部が最も上記軸線方向先端側に位置する外周刃は、この最先端の凸部の上記軸線に対する径方向の頂点が、上記コーナ刃の径方向の頂点と一致させられ、または上記コーナ刃の径方向の頂点と上記エンドミル回転方向から見て直線状に延びる直線部によって結ばれるとともに、
他の外周刃は、上記ラフィング部の最先端の凸部の上記軸線に対する径方向の頂点が、上記コーナ刃の径方向の頂点と上記エンドミル回転方向から見て直線状に延びる直線部によって結ばれているラフィングエンドミル。 - すべての上記外周刃の上記直線部の上記軸線方向における長さが、上記ラフィング部における波形のピッチの2倍以下である請求項1に記載のラフィングエンドミル。
- すべての上記外周刃の上記ラフィング部における最先端以外の凸部の上記軸線に対する径方向の頂点の上記軸線からの半径は、最先端の凸部の上記頂点の上記軸線からの半径と等しいか、または最先端の凸部の上記頂点の上記軸線からの半径よりも0.04mmまでの範囲で小さくされている請求項1または請求項2に記載のラフィングエンドミル。
- 上記外周刃の上記直線部における逃げ角は、上記ラフィング部における逃げ角と等しいか、または該ラフィング部における逃げ角よりも2°までの範囲で小さくされている請求項1から請求項3のうちいずれか一項に記載のラフィングエンドミル。
- 上記外周刃のうち上記ラフィング部の最先端の凸部が最も上記軸線方向先端側に位置する外周刃は、この最先端の凸部の上記軸線に対する径方向の頂点において、
上記コーナ刃の径方向の頂点と一致させられていて、上記エンドミル回転方向から見て該コーナ刃の径方向における頂点の接線と10°以下の傾斜角をもって交差させられ、
または上記コーナ刃の径方向の頂点と上記エンドミル回転方向から見て直線状に延びる上記直線部によって結ばれて、該直線部と10°以下の傾斜角をもって交差させられている請求項1から請求項4のうちいずれか一項に記載のラフィングエンドミル。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020167011896A KR20160081917A (ko) | 2013-11-12 | 2014-11-06 | 러핑 엔드밀 |
US15/030,963 US9993882B2 (en) | 2013-11-12 | 2014-11-06 | Roughing end mill |
CN201480056159.3A CN105636729B (zh) | 2013-11-12 | 2014-11-06 | 粗加工立铣刀 |
EP14861371.4A EP3069808B1 (en) | 2013-11-12 | 2014-11-06 | Roughing end mill |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2013233970A JP6221660B2 (ja) | 2013-11-12 | 2013-11-12 | ラフィングエンドミル |
JP2013-233970 | 2013-11-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2015072389A1 true WO2015072389A1 (ja) | 2015-05-21 |
Family
ID=53057325
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2014/079427 WO2015072389A1 (ja) | 2013-11-12 | 2014-11-06 | ラフィングエンドミル |
Country Status (6)
Country | Link |
---|---|
US (1) | US9993882B2 (ja) |
EP (1) | EP3069808B1 (ja) |
JP (1) | JP6221660B2 (ja) |
KR (1) | KR20160081917A (ja) |
CN (1) | CN105636729B (ja) |
WO (1) | WO2015072389A1 (ja) |
Families Citing this family (9)
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JP6384385B2 (ja) * | 2015-03-31 | 2018-09-05 | 三菱マテリアル株式会社 | ラフィングエンドミル |
JP6691441B2 (ja) * | 2016-06-23 | 2020-04-28 | 株式会社Daiko Tool | エンドミル |
IL254172B (en) * | 2017-08-27 | 2022-03-01 | Hanita Metal Works Ltd | Solid edge grinder with complex surface cleaning |
CN109759808B (zh) * | 2019-03-18 | 2024-04-02 | 浙江浪潮精密机械有限公司 | 一种具有两种斜切削刃的环保型木工铣刀以及其加工工艺 |
JP7227480B2 (ja) * | 2019-03-26 | 2023-02-22 | 三菱マテリアル株式会社 | ラフィングエンドミル |
CN110090994B (zh) * | 2019-05-23 | 2020-06-19 | 兰州理工大学 | 用于机翼叠层结构螺旋铣的分段混合刃型交叉分屑刀具 |
JP2021030328A (ja) * | 2019-08-20 | 2021-03-01 | 三菱マテリアル株式会社 | ラフィングエンドミル |
JP7235627B2 (ja) * | 2019-09-18 | 2023-03-08 | 川崎重工業株式会社 | エンドミルおよびその製造方法 |
JP7460905B2 (ja) | 2020-07-07 | 2024-04-03 | 株式会社Moldino | エンドミル |
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2013
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-
2014
- 2014-11-06 US US15/030,963 patent/US9993882B2/en active Active
- 2014-11-06 KR KR1020167011896A patent/KR20160081917A/ko not_active Application Discontinuation
- 2014-11-06 WO PCT/JP2014/079427 patent/WO2015072389A1/ja active Application Filing
- 2014-11-06 CN CN201480056159.3A patent/CN105636729B/zh active Active
- 2014-11-06 EP EP14861371.4A patent/EP3069808B1/en active Active
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See also references of EP3069808A4 |
Also Published As
Publication number | Publication date |
---|---|
EP3069808A1 (en) | 2016-09-21 |
EP3069808A4 (en) | 2017-07-12 |
US20160263668A1 (en) | 2016-09-15 |
US9993882B2 (en) | 2018-06-12 |
EP3069808B1 (en) | 2022-08-31 |
CN105636729A (zh) | 2016-06-01 |
CN105636729B (zh) | 2017-07-21 |
KR20160081917A (ko) | 2016-07-08 |
JP6221660B2 (ja) | 2017-11-01 |
JP2015093350A (ja) | 2015-05-18 |
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