WO2013099954A1 - ラジアスエンドミル - Google Patents
ラジアスエンドミルInfo
- Publication number
- WO2013099954A1 WO2013099954A1 PCT/JP2012/083672 JP2012083672W WO2013099954A1 WO 2013099954 A1 WO2013099954 A1 WO 2013099954A1 JP 2012083672 W JP2012083672 W JP 2012083672W WO 2013099954 A1 WO2013099954 A1 WO 2013099954A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cutting edge
- corner
- outer peripheral
- gash
- end mill
- 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
- B23C2210/00—Details of milling cutters
- B23C2210/04—Angles
- B23C2210/0407—Cutting angles
- B23C2210/0442—Cutting angles positive
- B23C2210/045—Cutting angles positive axial rake angle
-
- 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
- B23C2210/40—Flutes, i.e. chip conveying grooves
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2210/00—Details of milling cutters
- B23C2210/66—Markings, i.e. symbols or indicating marks
-
- 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.]
Definitions
- the present invention relates to a radius end mill having a corner R cutting edge.
- Radius end mills are capable of high-efficiency cutting and are widely used.
- a main gash is formed at the tip of the chip discharge groove that intersects the bottom cutting edge, and the outer side intersects from the boundary between the bottom cutting edge of the main gash surface and the corner R cutting edge to the outer peripheral cutting edge.
- a radius end mill in which a sub-gash surface is formed in the region is disclosed.
- Patent Document 2 discloses a radius end mill in which a gash is provided from the bottom cutting edge to the corner R edge.
- This invention solves such a problem, and it is providing the radius end mill which can suppress that a cutting edge raises a chip
- the radius end mill of the present invention is A tool body; A cutting edge comprising a bottom cutting edge existing at the tip of the tool body, an outer peripheral cutting edge existing on the outer periphery of the tool main body, and a corner R cutting edge connecting between the bottom cutting edge and the outer peripheral cutting edge; Rake faces of the bottom cutting edge, the corner R cutting edge and the outer peripheral cutting edge; A chip discharge groove extending rearward of the rake face; A corner gash that is present adjacent to the corner R cutting edge of the rake face; Comprising The corner gash has a part of an edge on the corner R cutting edge other than a boundary between the corner R cutting edge and the bottom cutting edge and a boundary between the corner R cutting edge and the outer peripheral cutting edge.
- the axial rake at the end of the R cutting edge on the bottom cutting edge side in contact with the corner gash is 5 to 20 °.
- the corner R cutting edge in the vicinity of the outer peripheral cutting edge it is possible to suppress the formation of a step or a corner that causes chipping or chip clogging at the joint between the corner R cutting edge and the outer peripheral cutting edge. At the same time, the sharpness is improved and the transverse feed processing can be performed efficiently.
- the corner R cutting edge in the vicinity of the bottom cutting edge has a small axial rake (axial rake angle), no step on the rake face, and does not hinder the flow of chips. As a result, the surface roughness of the machined surface can be made smooth.
- a radius end mill (hereinafter simply referred to as an end mill) 20 shown in FIGS. 1 and 2 is made of a hard material such as cemented carbide, and has a rotationally symmetric, generally cylindrical tool body 1 having a central axis O as a rotation axis.
- a bottom cutting edge 2 exists on the tip side of the tool body 1 that rotates around the central axis O.
- An outer peripheral cutting edge 4 is present on the outer periphery of the tool body 1. Between the bottom cutting edge 2 and the outer peripheral cutting edge 4, there is a corner R cutting edge 3 that connects them.
- the end mill 20 includes a plurality of a series of cutting blades 5 including a bottom cutting edge 2, a corner R cutting edge 3, and an outer peripheral cutting edge 4 on the distal end side.
- a rake face 6 is provided following the cutting edge 5, and a chip discharge groove 7 extends behind the rake face 6.
- the chip discharge groove 7 is provided on the outer peripheral side surface of the tool body 1.
- the chip discharge groove 7 is twisted in a spiral shape in a direction opposite to the rotation direction T of the end mill 20 during cutting (hereinafter referred to as a reverse rotation direction) as it goes from the front end to the rear end side.
- the tip of the rake face 6 is provided with a tip gash 9 having an angle ⁇ formed with the rotation axis O smaller than the angle ⁇ formed with the rotation axis O of the chip discharge groove 7.
- the tip gash 9 functions as a rake face of the bottom cutting edge 2 and also functions as a chip pocket.
- a corner gouache 8 is provided at a position following the corner R cutting edge 3 of the rake face 5.
- the corner gash 8 is adjacent to the tip gash 9.
- a part of the edge is the corner R other than the boundary P between the corner R cutting edge 3 and the bottom cutting edge 2 and the boundary Q between the corner R cutting edge 3 and the outer peripheral cutting edge 4.
- the edge rake is provided so that a part of the edge is inside the corner R cutting edge 3, and the axial rake at the end of the corner R cutting edge 3 on the bottom cutting edge 2 side in contact with the corner gash 8 is 5 It is ⁇ 20 °.
- the corner face 8 is present on the rake face 6 on the outer side of the tip gash 9 and adjacent to the corner R cutting edge 3. It consists of a flat or curved surface that is receding.
- An axial rake (rotation axis direction) that is an inclination angle with respect to the rotation axis O at the bottom cutting edge 2 side end A that is an end on the bottom cutting edge 2 side of the edge on the corner R cutting edge 3 of the corner gash 8.
- the rake angle ⁇ is 5 to 20 °.
- the rake face 6 includes a tip gash 9 following the bottom cutting edge 2, a corner gash 8 following the corner R cutting edge 3, and an outer peripheral cutting edge rake face 10 following the outer peripheral cutting edge 4.
- the chip discharge groove 7 is connected to the outer peripheral cutting edge rake face 10.
- a bottom cutting edge flank 14 is provided on the opposite side of the bottom cutting edge 2 from the tip gash 9, and a corner R cutting edge flank 15 is provided on the opposite side of the corner R cutting edge 3 from the corner gash 8.
- An outer peripheral cutting edge flank 16 is provided on the side of the blade 4 opposite to the outer peripheral cutting edge rake face 10.
- the corner gouache 8 is in contact with the corner R cutting edge 3, but the area in contact with the corner R cutting edge 3 is more than the boundary P between the corner R cutting edge 3 and the bottom cutting edge 2. Extends from the inner position to the inner position of the corner R cutting edge 3 than the boundary Q with the outer peripheral cutting edge 4. That is, the corner gouache 8 is in contact with the middle position of the corner R cutting blade 3 that does not reach both the boundaries P and Q.
- the bottom cutting edge side end A which is a part of the edge of the corner gash 8 in contact with the corner R cutting edge 3 is located on the corner R cutting edge 3 side with respect to the boundary P, and at the other end of the edge.
- a certain outer peripheral cutting edge side end B is located on the corner R cutting edge 3 side with respect to the boundary Q.
- the corner gash 8 is small in the vicinity of the outer peripheral cutting edge side end B, so that the step or corner that causes chipping or chip clogging at the joint between the corner R cutting edge 3 and the outer peripheral cutting edge 4 is achieved. It is difficult to do. Further, since the axial rake ⁇ is 5 to 20 °, the sharpness is improved and the transverse feed processing can be performed efficiently. On the other hand, the rake angle is small in the vicinity of the bottom cutting edge side end A. As a result, the tip gash 9 and the corner gash 8 and the corner gash 8 and the outer peripheral cutting edge rake face 10 are smoothly connected without any step, and the flow of chips on the rake face 6 is hardly hindered.
- the surface roughness of the processed surface of the work material during cutting can be made smooth. That is, if there is a step between the tip gash 9 and the corner gash 8, and between the corner gash 8 and the outer peripheral cutting edge rake face 10, chips are caught by the step and welding occurs. Further, when the chips are caught, the resistance applied to the cutting blade 5 (particularly the corner R cutting blade 3) is increased, and chipping occurs in the cutting blade 5, resulting in poor surface roughness of the work surface of the work material. .
- the polishing marks 11 are present on the corner gash 8.
- the polishing mark 11 is not a straight line, but is provided in a curved shape that bends in the same direction as the curved shape of the ridgeline of the corner R cutting edge 3.
- FIG. 3A by polishing the corner gash 8 so that the polishing marks 11 are provided in the curved shape, it is possible to suppress the occurrence of chipping at the corner R cutting edge 3 during polishing.
- the edge of the polishing mark 11 may be applied to the corner R cutting edge 3, and a jagged step (chipping) 18 may occur in the corner R cutting edge 3.
- a jagged step (chipping) 18 occurs in the corner R cutting edge 3 as shown in FIG. This can be suppressed. As a result, the surface roughness of the processed surface of the work material can be made smoother.
- the corner gash 8 is a convex curved surface. As a result, the edge strength of the corner R cutting edge 3 is increased, and chipping of the corner R cutting edge 3 is suppressed. Further, since the corner gash 8 is a convex curved surface, it is difficult to form a step between the tip gash 9 and the corner gash 8 and between the corner gash 8 and the outer peripheral cutting edge rake face 10.
- ⁇ is larger than 0 ° and 20 by controlling the angles ⁇ and ⁇ described later to predetermined angles. It can be controlled to a range smaller than °.
- 3 is 1 to 20 °
- the rake angle near the bottom cutting edge 2 of the corner R cutting edge 3 is small, and the surface roughness of the machined surface is smoothed by the edge effect. it can.
- the bottom cutting edge 2 is slightly inclined from the central axis O toward the distal end side of the end mill 20 toward the outer peripheral direction in order to reduce rubbing wear. Further, the bottom cutting edge 2 is curved at a position from the bottom cutting edge side end A toward the central axis O, so that the surface roughness of the machining surface cut by the bottom cutting edge 2 can be made smooth. it can.
- At least one of the plurality of cutting edges is a recess extending from the outer peripheral cutting edge 4 side end B to the rake face 6 in contact with the corner gash 8 of the corner R cutting edge 3 as shown in FIG. 12, which can prevent the corner R cutting edge 3 and the outer peripheral cutting edge 4 from forming a step or a corner that causes chipping or clogging of chips and finely dividing the chips. It is possible to prevent the chips from getting tangled and clogging the rake face.
- the concave portion 12 extends in the direction perpendicular to the cutting edge 6 of the rake face 6, that is, in the direction perpendicular to the end of the corner cutting edge 4 on the side of the outer peripheral cutting edge 4 in contact with the corner gash 8. It is desirable in terms of improving chip discharge performance.
- the recessed part 12 can eliminate the part which remains without being cut by the work material. Moreover, the recessed part 12 can change the balance of the cutting resistance concerning each cutting blade 5, and can suppress generation
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Milling Processes (AREA)
Abstract
Description
工具本体と、
該工具本体の先端に存在する底切刃、前記工具本体の外周に存在する外周切刃および前記底切刃と前記外周切刃との間をつなぐコーナR切刃からなる切刃と、
前記底切刃、前記コーナR切刃および前記外周切刃のすくい面と、
該すくい面の後方に延在する切屑排出溝と、
前記すくい面の前記コーナR切刃に隣接して存在するコーナギャッシュと、
を具備し、
前記コーナギャッシュは、縁の一部が前記コーナR切刃と前記底切刃との境界および前記コーナR切刃と前記外周切刃との境界以外の前記コーナR切刃上にあり、前記コーナR切刃の前記コーナギャッシュと接する前記底切刃側の端部におけるアキシャルレーキが5~20°である。
2 底切刃
3 コーナR切刃
4 外周切刃
5 切刃
6 すくい面
7 切屑排出溝
8 コーナギャッシュ
9 先端ギャッシュ
10 外周切刃すくい面
11 研磨痕
12 凹部
14 底切刃逃げ面
15 コーナR切刃逃げ面
16 外周切刃逃げ面
20 ラジアスエンドミル(エンドミル)
O 中心軸
A 底切刃側端部
B 外周切刃側端部
α 点Aにおけるアキシャルレーキ(回転軸方向すくい角)
Claims (8)
- 工具本体と、
該工具本体の先端に存在する底切刃、前記工具本体の外周に存在する外周切刃および前記底切刃と前記外周切刃との間をつなぐコーナR切刃からなる切刃と、
前記底切刃、前記コーナR切刃および前記外周切刃のすくい面と、
該すくい面の後方に延在する切屑排出溝と、
前記すくい面の前記コーナR切刃に隣接して存在するコーナギャッシュと、
を具備し、
前記コーナギャッシュは、縁の一部が前記コーナR切刃と前記底切刃との境界および前記コーナR切刃と前記外周切刃との境界以外の前記コーナR切刃上にあり、前記コーナR切刃の前記コーナギャッシュと接する前記底切刃側の端部におけるアキシャルレーキが5~20°であるラジアスエンドミル。 - 前記コーナR切刃と前記外周切刃との境界における前記コーナR切刃に対する垂線と、前記コーナギャッシュの前記縁の一部である前記外周切刃側端部における前記コーナR切刃に対する垂線とのなす角が30~60°である請求項1記載のラジアスエンドミル。
- 前記コーナR切刃の前記底切刃との境界における前記コーナR切刃に対する垂線と、前記コーナギャッシュの前記縁の一部である前記底切刃側端部における前記コーナR切刃に対する垂線とのなす角が1~20°である請求項1または2記載のラジアスエンドミル。
- 前記底切刃は、前記コーナR切刃との境界から内側に向かって曲線状である請求項1乃至3のいずれか記載のラジアスエンドミル。
- 前記切刃を複数具備し、該複数の切刃のうちの少なくとも一つの切刃は、前記外周切刃側端部から前記すくい面に延在する凹部を有する請求項1乃至4のいずれか記載のラジアスエンドミル。
- 前記凹部は、前記すくい面において、前記外周切刃側端部に対して垂直な方向に延在している請求項5記載のラジアスエンドミル。
- 前記複数の切刃の少なくとも2つの切刃に前記凹部を備え、各切刃における前記凹部の位置が異なっている請求項5または6記載のラジアスエンドミル。
- 前記コーナギャッシュに研磨痕が存在するとともに、該研磨痕は前記コーナR切刃と平行に設けられている請求項1乃至7のいずれか記載の切削工具。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/368,315 US9707627B2 (en) | 2011-12-27 | 2012-12-26 | Radius end mill |
CN201280064253.4A CN104023884B (zh) | 2011-12-27 | 2012-12-26 | 圆角立铣刀 |
EP12862058.0A EP2799172B1 (en) | 2011-12-27 | 2012-12-26 | Radius end mill |
JP2013551744A JP5744235B2 (ja) | 2011-12-27 | 2012-12-26 | ラジアスエンドミル |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011285761 | 2011-12-27 | ||
JP2011-285761 | 2011-12-27 |
Publications (1)
Publication Number | Publication Date |
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WO2013099954A1 true WO2013099954A1 (ja) | 2013-07-04 |
Family
ID=48697435
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2012/083672 WO2013099954A1 (ja) | 2011-12-27 | 2012-12-26 | ラジアスエンドミル |
Country Status (5)
Country | Link |
---|---|
US (1) | US9707627B2 (ja) |
EP (1) | EP2799172B1 (ja) |
JP (1) | JP5744235B2 (ja) |
CN (1) | CN104023884B (ja) |
WO (1) | WO2013099954A1 (ja) |
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WO2016152611A1 (ja) * | 2015-03-20 | 2016-09-29 | 三菱日立ツール株式会社 | スクエアエンドミル |
WO2018003948A1 (ja) * | 2016-06-30 | 2018-01-04 | 日本特殊陶業株式会社 | エンドミル本体及びラジアスエンドミル |
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2012
- 2012-12-26 US US14/368,315 patent/US9707627B2/en active Active
- 2012-12-26 CN CN201280064253.4A patent/CN104023884B/zh active Active
- 2012-12-26 JP JP2013551744A patent/JP5744235B2/ja active Active
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Also Published As
Publication number | Publication date |
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CN104023884B (zh) | 2016-05-11 |
EP2799172A1 (en) | 2014-11-05 |
EP2799172B1 (en) | 2021-01-20 |
US20140341662A1 (en) | 2014-11-20 |
CN104023884A (zh) | 2014-09-03 |
US9707627B2 (en) | 2017-07-18 |
JP5744235B2 (ja) | 2015-07-08 |
EP2799172A4 (en) | 2015-11-11 |
JPWO2013099954A1 (ja) | 2015-05-11 |
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