WO2015060392A1 - ボールエンドミル - Google Patents
ボールエンドミル Download PDFInfo
- Publication number
- WO2015060392A1 WO2015060392A1 PCT/JP2014/078235 JP2014078235W WO2015060392A1 WO 2015060392 A1 WO2015060392 A1 WO 2015060392A1 JP 2014078235 W JP2014078235 W JP 2014078235W WO 2015060392 A1 WO2015060392 A1 WO 2015060392A1
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- WIPO (PCT)
- Prior art keywords
- end mill
- tip
- axis
- gash
- flank
- Prior art date
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Classifications
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- 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
- B23C5/1009—Ball nose end mills
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- 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
- B23C2210/28—Arrangement of teeth
- B23C2210/285—Cutting edges arranged at different diameters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2210/00—Details of milling cutters
- B23C2210/54—Configuration of the cutting part
-
- 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
Definitions
- the present invention relates to a ball end mill in which a bottom blade having a convex hemispherical shape in which the rotation locus around the axis is centered on the axis is formed at the tip of an end mill main body rotated about the axis.
- each bottom blade land has a convex R-curved surface, and the edges of each land are all in contact with the vertex center of the entire bottom blade.
- Patent Document 2 also has three or more bottom blades, and is bent from the bottom blade (ball blade) in the vicinity of the axial center of the end mill as viewed from the bottom of the end mill, and extends to the next blade in the direction of end mill rotation.
- the ball end mill is provided with a cutting edge that has a clearance angle smaller than the clearance angle of the bottom edge, the inflection point is a point on the bottom edge, and the position is 0.015 mm or more away from the axis.
- a groove shape having a V-shaped cross section is generally formed by a gash grindstone having an outer peripheral surface having a V-shaped cross section at a further tip portion of a chip discharge groove formed on the outer periphery of the end portion of the end mill body.
- the gash is formed so as to extend inward, and the rotation trajectory around the axis is centered on the axis of the end mill body at the intersection ridge line between the wall facing the end mill rotation direction of the gash and the tip flank of the end mill body tip.
- the bottom blade is formed in a hemispheric shape having a convex shape on the tip side.
- the gash must be formed to a position slightly away from the axis on the end mill main body tip, and the bottom blade must be formed at the intersecting ridge line portion of the wall surface facing the end mill rotation direction and the tip flank surface.
- the intersection ridgeline between the rounded part of the inner peripheral edge of the gash and the tip flank is slightly extended in the direction of rotation of the end mill than the bottom blade part having a hemispherical rotation locus.
- the ball end mill described in Patent Document 2 is supposed to solve the problem of the ball end mill described in Patent Document 1, but the cutting is performed by bending from the bottom blade to the next blade.
- the flank face of the blade is given a small but flank angle, and such a flank face is formed up to the axial center. Therefore, in the same manner as the ball end mill described in Patent Document 1, the flank face is actually positioned at the axial center position. Pointed protrusions are formed, which may also cause deterioration in processing accuracy and chipping of the bottom blade.
- the present invention has been made under such a background, and it is possible to prevent a sharp protrusion from being formed in the vicinity of the axis at the end of the end mill body, thereby improving processing accuracy and preventing the bottom blade from being damaged.
- Another object of the present invention is to provide a ball end mill capable of improving the chip discharging performance in the vicinity of the axis of the end mill main body.
- one aspect of the present invention is that a plurality of chip discharge grooves are spaced in the circumferential direction on the outer periphery of the end portion of the end mill body rotated around the axis.
- a gash extending inwardly is formed, a wall surface facing the end mill rotation direction of the gash, and a tip clearance of the end mill main body tip that intersects the wall surface
- a base blade having a hemispherical shape in which the rotation locus around the axis is centered on the axis and is convex toward the tip is formed at each cross ridge line with the surface, and at least of these bottom blades
- Two bottom blades are extended in the vicinity of the axis at the tip of the end mill body, and two top blades formed with two bottom blades adjacent to each other in the circumferential direction among these at least two bottom blades.
- the first gash located on the end mill rotation direction side extends beyond the axis on the end mill main body tip, and the second gash located on the end mill rotation direction rear side is the axis on the end mill main body.
- the first tip flank that intersects the wall surface facing the end mill rotation direction of the first gash via the first bottom blade of the two bottom blades is formed.
- the second gash is extended toward the second tip flank that intersects the wall face of the second gash facing the end mill rotation direction via the second bottom blade of the two bottom blades.
- a concave bent surface extending in the outer peripheral side is formed by being bent in the extended portion of the first tip flank.
- the second bottom cutting edge characterized in that are continuous and extend in a direction intersecting at an obtuse angle to the concave curved folding surface.
- the first and second bottom blades adjacent to each other in the circumferential direction among the at least two bottom blades extended in the vicinity of the axis at the tip of the end mill body are formed.
- the first ghash located on the end mill rotation direction side is formed so as to extend beyond the axis on the end mill main body tip. It is possible to secure a large capacity of the pocket communicating with the groove in the vicinity of the axis, and to improve chip discharge performance by the first bottom blade.
- the 1st tip flank which intersects the 1st gash via the 1st bottom blade is extended toward the 2nd tip flank which adjoins the end mill rotation direction back side, and this Between the extension portion and the second tip flank surface, a concave fold surface is formed which is continuously bent and extended to the outer peripheral side of the extension portion of the first tip flank surface.
- the two bottom blades are connected so as to extend in a direction intersecting the obtuse angle.
- the second bottom blade is formed as it is on the intersecting ridge line portion between the wall surface facing the end mill rotation direction of the second gash whose inner peripheral end is away from the axis and the second tip flank surface, It is possible to prevent the portion from being formed by extending the first tip flank that recedes from the hemisphere formed by the rotation trajectory of the bottom blade as it goes rearward in the end mill rotation direction and forming a concave bent surface. .
- the portion where the above-described protrusion is formed is configured to be chamfered by the extended portion of the first tip flank and the concave bent surface. It is possible to improve machining accuracy and extend the end mill life without causing streaking on the machining surface due to the projection or cutting the broken projection into the bottom blade during cutting. It becomes possible.
- the second bottom blade is connected to the concave bent surface extending in the direction of the obtuse angle and extending in the direction intersecting the obtuse angle with the extended portion of the first tip flank. It is also possible to ensure the strength at the inner peripheral edge of the bottom blade of 2 and prevent defects and the like.
- the second bottom blade and the concave bent surface may be configured to directly intersect each other with an obtuse angle, and the second bottom blade and the concave bent surface may be connected to each other through a chamfered portion, a rounded convex curved portion, or the like.
- the extension line of the bottom blade and the extension surface of the concave curved surface may intersect at an obtuse angle.
- the second bottom blade or its extension line and the concave curved surface or its extension may be used.
- the included angle between the straight line connecting the intersection with the surface and the center of the hemisphere formed by the rotation trajectory of the bottom blade and the axis is preferably in the range of 1 ° to 10 °.
- the inner peripheral end of the second bottom blade When it becomes larger, the inner peripheral end of the second bottom blade is too far away from the axis, and cutting is performed with only the first bottom blade in the vicinity of the axis of the end mill main body tip. There is a risk that the burden of the burden will become too large.
- the included angle is smaller than the above range, the extension portion and the concave bent surface of the first tip flank surface may become too small to reliably prevent the formation of the protruding portion. .
- the second bottom blade or its extension line In order for the second bottom blade to extend in a direction intersecting with the concave curved surface at an obtuse angle, the second bottom blade or its extension line is connected to the concave curved surface or its extended surface and the second bottom blade. It suffices if it intersects at an obtuse angle with the intersecting ridge line portion with the rake face, or the intersecting ridge line portion between the concave curved surface or its extended surface and the tip flank surface of the second bottom blade
- the end portion of the end mill body has a 180 ° rotationally symmetrical shape about the axis, and four bottom blades are extended in the vicinity of the axis at the end of the end mill body, and the four gashes formed with these bottom blades are:
- the tip of the end mill body is thus rotated 180 ° around the axis so that the four bottom blades extend in the vicinity of the axis at the tip of the end mill body, and the four gashes of the four bottom blades are alternately arranged in the circumferential direction.
- the two first gashes are formed so as to cross each other across the axis, and therefore, between these two first gashes, The first tip flank intersecting the first gasche via the first bottom blade intersects to form a chisel.
- the chisel may intersect the two first bottom blades at an obtuse angle in a front view in the axial direction and may be orthogonal to the axial line.
- the concave bent surface is formed by grinding the first tip flank by grinding when the first tip flank is extended toward the second tip flank to form the extension. It can be formed by causing the grindstone to interfere with the second tip flank and scraping the inner periphery of the second tip flank.
- the tip of the end mill body is far away from the axis, for example, more than the range of the included angle.
- a so-called short-bottom blade having an inner peripheral edge at a position and having a rotation trajectory forming a convex hemisphere together with the long-bottom blade may be formed.
- the present invention it is possible to improve the chip discharging performance in the vicinity of the axis at the tip of the end mill body, and to prevent the protrusion from being formed in the vicinity of the axis.
- FIG. 4 is a schematic diagram showing a cross section along the axis of the rotation locus in the vicinity of the axis near the axis at the tip of the end mill body of the embodiment shown in FIG. 1 (however, for explanation, the radius of the hemisphere formed by the rotation locus is shown in FIG.
- the end mill body 1 is formed of a hard material such as cemented carbide and has a columnar shape centered on the axis O, and its rear end (upper right side 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 spindle of the machine tool and rotated around the axis O in the end mill rotation direction T shown in FIG. 3 cuts the workpiece.
- a plurality of chip discharge grooves 4 are formed on the outer periphery of the cutting edge portion 3 at the tip of the end mill body 1 at intervals in the circumferential direction.
- the four chip discharge grooves 4 are formed at equal intervals in the circumferential direction, and each chip discharge groove 4 spirals toward the rear side in the end mill rotation direction T toward the rear end side in the axis O direction. It is formed to be twisted into a shape.
- the wall surface is raked like the chip discharge groove 4 in a spiral manner.
- the outer peripheral blades 6 are formed, and the four outer peripheral blades 6 respectively formed in the four chip discharge grooves 4 are positioned on one cylindrical surface with the axis O as the center.
- the tip of the chip discharge groove 4 is further provided with a bottom surface of the chip discharge groove 4 facing the outer peripheral side of the end mill body 1 from the wall surface facing the end mill rotation direction T and a wall surface facing the rear side of the end mill rotation direction T.
- Gash 7 is formed so as to cut out a portion on the rear side in the end mill rotation direction T.
- the gash 7 has, for example, a concave groove shape having a V-shaped cross section and includes a wall surface facing the end mill rotation direction T and a wall surface facing the rear side of the end mill rotation direction T. Is extended toward the inner peripheral side of the end mill main body 1 toward the front end side, and reaches the vicinity of the axis O at the front end of the end mill main body 1. However, the valley bottom portion is actually connected to both wall surfaces of the gash 7 in a concave curve shape such as a concave arc.
- each tip flank 8 includes a tip first flank (second surface) 8 a having a substantially constant width located on the end mill rotation direction T side, and the tip first flank. 8 a has a tip second flank 8 b that is continuous to the rear side T in the end mill rotation direction T and has a larger clearance angle than the tip first flank 8 a.
- the wall surface facing the rear side in the end mill rotational direction T of the gash 7 adjacent to the rear side in the end mill rotational direction T of each front end flank 8 intersects the rear side in the end mill rotational direction T of the second tip flank 8b. ing.
- an intersection ridge line portion between the wall surface of the gasche 7 facing the end mill rotation direction T and the tip first flank 8a of the tip flank 8 connected to the rear side of the end mill rotation direction T of each gash 7 has an axis O around the axis O.
- a bottom blade 9 having a hemispherical shape whose rotation locus has a center C on the axis O and protrudes toward the distal end side of the end mill body 1 is formed to be continuous with the distal end of the outer peripheral blade 6. As shown in FIG. 2, these bottom blades 9 are also twisted toward the rear side in the end mill rotation direction T as it goes toward the rear end side of the end mill body 1 in this embodiment.
- these four bottom blades 9 connected to the four outer peripheral blades 6 are all extended to the vicinity of the axis O at the end of the end mill body 1.
- the cutting edge portion 3 is formed in a 180 ° rotationally symmetric shape around the axis O, and is a bottom edge located on the end mill rotation direction T side of two bottom edges 9 adjacent in the circumferential direction.
- 9 bottom blade extending in the vertical direction in FIGS. 3, 4A, and 5A
- the bottom blade 9 (shown in FIG. 3) is located on the rear side in the end mill rotation direction T of the first bottom blade 9A.
- the bottom blade extending in the left-right direction in FIGS. 4A and 5A) is the second bottom blade 9B.
- the gash 7 formed on the wall surface of the first bottom blade 9A facing the end mill rotation direction T is the first gash 7A, and is located on the rear side in the end mill rotation direction T of the first gash 7A.
- the gash 7 formed on the wall surface of the bottom blade 9B facing the end mill rotation direction T is the second gash 7B.
- the tip flank 8 that intersects the first gash 7A via the first bottom blade 9A is the first tip flank 8A, and intersects the second gash 7B via the second bottom blade 9B.
- the leading end flank 8 is the second leading flank 8B.
- the first gash 7A extends from the outer peripheral side of the cutting edge portion 3 beyond the axis O on the tip of the end mill body 1 and is formed in a 180 ° rotationally symmetric shape around the axis O.
- the two first gashs 7A formed on the cutting edge portion 3 are formed at intervals without crossing each other.
- the second gash 7B is also spaced from the axis O so as not to cross the axis O without crossing the first gash 7A located in the end mill rotation direction T side in the present embodiment. It is formed so as to be separated from the first gash 7A located on the rear side in the end mill rotation direction T.
- the second gash 7B intersects the front end first flank 8a of the first front flank 8A adjacent to the end mill rotation direction T side.
- the first tip flank 8A is extended rearward in the end mill rotation direction T toward the second tip flank 8B, and the first tip flank 8A is extended. Between the portion 8c and the second tip flank 8B, a concave bent surface 10 is formed which is concavely bent to the extended portion 8c and extends to the outer peripheral side. Further, the second bottom blade 9B intersects the concave bent surface 10 at an obtuse angle at the inner peripheral end P thereof.
- the tip first flank 8a of the first tip flank 8A intersects the valley bottom portion of the second gash 7B with the tip first flank 8a of the first tip flank 8A.
- the extension part 8c is extended so as to recede from the rotation locus of the first bottom blade 9A as it goes to the rear side in the end mill rotation direction T with the clearance angle as it is, until the position exceeding the concave curve formed.
- the concave bent surface 10 is continuously bent and bent at an obtuse angle with respect to the extended portion 8c, and as it extends toward the outer peripheral side along the direction in which the end mill rotation direction T and the second bottom blade 9B extend. It is formed so as to gradually rise and intersect the tip first flank 8a of the second tip flank 8B and the second bottom blade 9B at an obtuse angle.
- the intersection of the second bottom blade 9B and the concave bent surface 10, that is, the inner peripheral end P of the second bottom blade 9B and the bottom blade 9 form a rotation locus around the axis O.
- the included angle ⁇ formed by the straight line L connecting the center C of the hemisphere and the axis O is in the range of 1 ° to 10 °, and the extended portion 8c and the concave bent surface 10 of the first tip flank 8A. Is formed in a very small range near the axis O at the end of the end mill body 1.
- the radius of the hemisphere formed by the rotation locus of the bottom blade 9 is smaller than that in FIG. 4A, and the included angle ⁇ is larger.
- the tip first flank 8a of the first tip flank 8A is thus extended to form the extension 8c, on the axis O at the tip of the end mill body 1,
- the first first flank surfaces 8a of the two first front flank surfaces 8A are also formed so as to cross each other beyond the axis O, so that there is no gap between the two first gash surfaces 7A.
- a chisel 11 is formed in which the first flank 8a of the first tip flank 8A intersects.
- the chisel 11 is formed so as to intersect the two first bottom blades 9A at an obtuse angle in a front view and to be orthogonal to the axis O.
- the first tip flank 8A is extended toward the second tip flank 8B to form the extension 8c as described above, and the extension 8c and the first Since the concave bent surface 10 that is concavely bent with respect to the extended portion 8c and extends to the outer peripheral side is formed between the two front end flank 8B and the second front flank 8B, As in the case where the second bottom blade 9B is formed as it is at the intersecting ridge line portion with the wall surface facing the end mill rotation direction T of the second gash 7B, it is possible to prevent the protrusion from being formed at the inner peripheral end. it can.
- the valley bottom portion has a concave curve due to the roundness or sagging of the gash grindstone. Therefore, the intersecting ridge line between the wall surface of the second gash 7B facing the end mill rotation direction T and the second tip flank 8B. As shown in FIG. 5A, the inner peripheral end Q of the second bottom blade 9B formed in the portion slightly protrudes toward the end mill rotation direction T side from the portion where the rotation locus of the second bottom blade 9B forms a hemisphere. End up.
- the second tip flank 8B formed by the second bottom edge 9B at the crossing ridge line portion with the wall surface of the second gash retreats from the rotation locus as it goes to the rear side in the end mill rotation direction T.
- a relief angle is given. Therefore, conversely, when projecting toward the end mill rotation direction T as in the case of the inner peripheral end Q, the rotational trajectory of the bottom blade 9 is also the inner peripheral end Q as shown in FIG. Protrusions are formed so as to protrude from the formed hemisphere.
- an extension 8c is formed in which the first tip flank 8A is extended toward the second tip flank 8B. Further, it is possible to prevent the inner peripheral end P of the second bottom blade 9B from projecting toward the end mill rotation direction T side than the portion of the second bottom blade 9B forming the hemispherical rotation locus. As a result, as shown in FIG. 4B, a protrusion projecting from the hemisphere formed by the bottom blade 9 is formed at the inner peripheral end P of the second bottom blade 9B even in the rotation locus around the axis O. It can be prevented.
- the ball end mill having the above-described configuration, it is possible to prevent such a projection from causing a streak on the work surface of the workpiece and causing damage to the work surface, thereby deteriorating the work accuracy. Further, it is possible to prevent the protrusion from being broken and biting into the bottom blade 9 during cutting, thereby preventing the bottom blade 9 from being damaged. For this reason, it is possible to promote the extension of the life of the ball end mill while improving the processing accuracy.
- the first gash 7A is formed so as to extend beyond the axis O toward the inner peripheral side of the end mill body 1, and the chip discharging pocket by the first gash 7A communicating with the chip discharging groove 4 is defined as the axis.
- a large area can be secured in the vicinity of O. For this reason, it is possible to improve the discharge performance of the chips generated by the first bottom blade 9A that extends closer to the axis O than the second bottom blade 9B. It is possible to prevent the bottom blade 9A of 1 from being damaged.
- the first and second gashes 7A and 7B are formed at intervals without crossing each other, so that the strength of the end portion of the end mill body 1 can be ensured.
- the loss of the first and second bottom blades 9A and 9B can be further reliably prevented.
- two first and second gashes 7A and 7B are formed at the tip of the end mill main body 1.
- the first gashes 7A are spaced from each other without crossing each other. Therefore, all four gashes 7 do not communicate with each other, and the strength of the end mill body 1 can be further improved.
- the second gash 7B is formed so as not to exceed the axis O, it may intersect with the first gash 7A.
- the second bottom blade 9B intersects the concave bent surface 10 at an obtuse angle at the inner peripheral end P thereof, the strength at the inner peripheral end P of the second bottom blade 9B can be ensured. Further, it is possible to prevent the second bottom blade 9B from being damaged from the inner peripheral end P. Therefore, according to the ball end mill configured as described above, it is possible to further extend the life.
- the concave curved surface 10 may be flat or may be an uneven curved surface.
- the concave bent surface 10 may intersect the extended portion 8c of the first tip flank 8A with an angle, or may continue through a concave curved surface.
- the included angle ⁇ between the straight line L connecting the inner peripheral end P of the second bottom blade 9B and the center C of the hemisphere formed by the rotation locus of the bottom blade 9 and the axis O is 1 ° to 10 °.
- the included angle ⁇ when the included angle ⁇ is smaller than the above range, the extension portion 8c of the first tip flank 8A and the concave bent surface 10 also become small, and a protrusion is formed at the inner peripheral end P of the second bottom blade 9B. There is a risk that the formation cannot be reliably prevented.
- the included angle ⁇ when the included angle ⁇ is larger than the above range, the inner peripheral end P of the second bottom blade 9B is too far from the axis O, and the first bottom blade is located on the inner peripheral side of the inner peripheral end P.
- the part to be cut by 9A alone becomes too large, and the burden at the time of cutting on the first bottom blade 9A becomes large, so that there is a possibility that chipping occurs or wear is promoted.
- the second bottom blade 9B directly intersects the concave bent surface 10 at the inner peripheral end P at an obtuse angle. However, if these extend continuously in a direction intersecting with the obtuse angle, they are continuous. In other words, a chamfered portion, a rounded convex bent portion, or the like may be interposed between the second bottom blade 9B and the concave bent surface 10. In such a case, a straight line L connecting the intersection of the extension line of the second bottom blade 9B and the extension surface of the concave bent surface 10 and the center C of the hemisphere formed by the rotation locus of the bottom blade 9; It is sufficient that the included angle ⁇ formed by is in the range of 1 ° to 10 °.
- the second bottom blade 9B or the extension line thereof is connected to the concave bent surface 10 or the extension surface thereof. Intersecting ridgeline between the rake face of the second bottom blade 9B, or the ridgeline of the concave bent surface 10 or the extended surface thereof and the tip flank 8B (tip first flank 8a) of the second bottom blade 9B. It suffices if the part intersects an obtuse angle.
- the end portion of the end mill body 1 has a 180 ° rotationally symmetric shape around the axis O, and two first and second gashes 7A and 7B are alternately formed in the circumferential direction.
- the chisel 11 is formed between the two first gashes by intersecting the first tip flank 8A. For this reason, in the vicinity of the axis O where the chisel 11 intersects, the machining surface can be cut so that the machining surface of the workpiece is scraped off by the chisel 11 at the time of cutting, so that the machining surface roughness can be improved.
- first and second gashes 7A and 7B are alternately formed in the circumferential direction at the tip of the end mill body 1 in this way, and the end mill rotation direction T of these gashes 7
- the first and second bottom blades 9A and 9B are formed by extending all the bottom blades 9 formed on the intersecting ridgelines of the wall surfaces facing the first and second tip flank surfaces 8A and 8B to the vicinity of the axis O.
- the included angle ⁇ formed by the straight line L connecting the inner peripheral end and the center C with respect to the axis O between the first and second bottom blades 9A and 9B in the circumferential direction is within the above range.
- a so-called short bottom blade that is larger than the end O axis of the end mill body 1 and does not extend to the vicinity of the axis O may be formed.
- the gash formed on the wall surface with the short bottom blade facing the end mill rotation direction T may be communicated with the gash 7 adjacent to the rear side in the end mill rotation direction T.
- a total of four bottom blades 9 are extended to the vicinity of the axis O as described above, but two or three bottom blades 9 are extended to the vicinity of the axis O.
- the two bottom blades 9 adjacent in the circumferential direction are the first and second bottom blades 9A and 9B, or five or more bottom blades 9 are extended to the vicinity of the axis O.
- at least two bottom blades 9 adjacent in the circumferential direction may be the first and second bottom blades 9A and 9B.
- the present invention it is possible to improve chip discharging performance in the vicinity of the axis at the end of the end mill body, and to prevent a protrusion from being formed in the vicinity of the axis, and the protrusion can provide a work surface of the workpiece. It is possible to provide a ball end mill having a long life and high machining accuracy by preventing a streak or breakage due to breakage of the protrusion during cutting and biting into the bottom blade. . Therefore, it has industrial applicability.
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Abstract
Description
本願は、2013年10月23日に日本で出願された特願2013-220639号に基づき優先権を主張し、その内容をここに援用する。
また、ギャッシュ砥石によってギャッシュを形成する間にも、摩耗による、いわゆるダレによってV字の突端は丸みを帯びることになる。従って、特許文献1に記載のボールエンドミルのようにランドのエッジすなわち底刃のすべてを頂点中心部すなわちエンドミル本体先端における軸線上に接するようにしようとしても、ギャッシュ同士が重なり合って軸線上に底刃が形成されなくなるため現実的には難しい。
特に、本実施形態では、エンドミル本体1先端部に2つずつの第1、第2のギャッシュ7A、7Bが形成されているが、第1のギャッシュ7A同士も互いに交差することなく間隔をあけているので、4つのギャッシュ7すべてが連通することがなく、エンドミル本体1の一層の強度向上を図ることができる。ただし、第2のギャッシュ7Bは、軸線Oを越えることがないように形成されていれば、第1のギャッシュ7Aと交差していてもよい。
従って、産業上の利用可能性を有する。
3 切刃部
4 切屑排出溝
6 外周刃
7 ギャッシュ
7A 第1のギャッシュ
7B 第2のギャッシュ
8 先端逃げ面
8A 第1の先端逃げ面
8B 第2の先端逃げ面
8a 先端第1逃げ面
8b 先端第2逃げ面
8c 延長部
9 底刃
9A 第1の底刃
9B 第2の底刃
10 凹曲折面
11 チゼル
O エンドミル本体1の軸線
T エンドミル回転方向
P 第2の底刃9Bの内周端
C 底刃9の回転軌跡がなす半球の中心
L 内周端Pと中心Cとを結ぶ直線
θ 直線Lと軸線Oとがなす挟角
Claims (5)
- 軸線回りに回転させられるエンドミル本体の先端部外周に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とともに、これらの切屑排出溝の先端部には内周側に延びる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と、この壁面に交差する上記エンドミル本体先端部の先端逃げ面との交差稜線部に、上記軸線回りの回転軌跡が該軸線上に中心を有して先端側に凸となる半球状をなす底刃がそれぞれ形成されており、
これらの底刃のうち少なくとも2つの底刃は、上記エンドミル本体の先端における上記軸線の近傍に延長させられていて、これら少なくとも2つの底刃のうちさらに周方向に隣接する2つの底刃が形成された2つの上記ギャッシュは、エンドミル回転方向側に位置する第1のギャッシュが上記エンドミル本体先端上の上記軸線を越えて延びるとともに、エンドミル回転方向後方側に位置する第2のギャッシュは上記エンドミル本体先端上の上記軸線を越えることがないように形成されており、
上記第1のギャッシュのエンドミル回転方向を向く壁面に、上記2つの底刃のうちの第1の底刃を介して交差する第1の先端逃げ面は、上記第2のギャッシュのエンドミル回転方向を向く壁面に上記2つの底刃のうちの第2の底刃を介して交差する第2の先端逃げ面に向けて延長させられているとともに、この第1の先端逃げ面の延長部と上記第2の先端逃げ面との間には、上記第1の先端逃げ面の延長部に凹曲折して連なり外周側に延びる凹曲折面が形成されていて、上記第2の底刃が、この凹曲折面に鈍角に交差する方向に延びて連なっているボールエンドミル。 - 上記第2の底刃またはその延長線と上記凹曲折面またはその延長面との交点と上記底刃の回転軌跡がなす半球の中心とを結ぶ直線と、上記軸線とがなす挟角が1°~10°の範囲とされている請求項1に記載のボールエンドミル。
- 上記エンドミル本体の先端部は上記軸線回りに180°回転対称形状とされて、上記エンドミル本体の先端における上記軸線の近傍には4つの上記底刃が延長させられており、これらの底刃が形成された4つの上記ギャッシュは、周方向に交互に上記第1、第2のギャッシュとされていて、2つの上記第1のギャッシュ同士は互いに交差することなく間隔をあけて形成されている請求項1または請求項2に記載のボールエンドミル。
- 2つの上記第1のギャッシュ同士の間には、これらの第1のギャッシュに上記第1の底刃を介して交差する上記第1の先端逃げ面同士が交差するチゼルが形成されている請求項3に記載のボールエンドミル。
- 上記チゼルは、軸線方向の正面視において2つの上記第1の底刃に鈍角に交差するとともに、上記軸線に直交する請求項4に記載のボールエンドミル。
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EP14855943.8A EP3061551B1 (en) | 2013-10-23 | 2014-10-23 | Ball end mill |
KR1020167003501A KR20160074451A (ko) | 2013-10-23 | 2014-10-23 | 볼 엔드 밀 |
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EP3061551A1 (en) | 2016-08-31 |
JP5984777B2 (ja) | 2016-09-06 |
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US10449611B2 (en) | 2019-10-22 |
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