WO2021255919A1 - Fraise d'extrémité - Google Patents

Fraise d'extrémité Download PDF

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Publication number
WO2021255919A1
WO2021255919A1 PCT/JP2020/024134 JP2020024134W WO2021255919A1 WO 2021255919 A1 WO2021255919 A1 WO 2021255919A1 JP 2020024134 W JP2020024134 W JP 2020024134W WO 2021255919 A1 WO2021255919 A1 WO 2021255919A1
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Prior art keywords
plane
end mill
planes
angle
group
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PCT/JP2020/024134
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English (en)
Japanese (ja)
Inventor
岳 原田
宗一郎 柿木
能之 園田
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住友電工ハードメタル株式会社
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Priority to PCT/JP2020/024134 priority Critical patent/WO2021255919A1/fr
Publication of WO2021255919A1 publication Critical patent/WO2021255919A1/fr

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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

Definitions

  • This disclosure relates to end mills.
  • Patent Document 1 JP-A-10-113808
  • Patent Document 2 JP-A-2015-44275
  • Patent Document 3 JP-A-2008-49428
  • Patent Document 4 JP-A-2008-49428
  • Patent Document 1 discloses an end mill in which an arc-shaped bottom blade is used as a ball blade and a V-shaped blade groove is arranged in the ball blade.
  • Patent Document 2 discloses a ball end mill having a spherical grinding execution surface for grinding a work material at the center of rotation of the tip of the tool tip.
  • Patent Document 3 discloses a cutting tool having a cutting edge having a shape having no flat surface portion at the tip of the cutting edge.
  • Patent Document 4 discloses a drill for making a hole having a small diameter.
  • This drill has a drill portion at the tip.
  • the drill portion integrally includes a regular quadrangular columnar base portion and a regular quadrangular pyramid-shaped blade portion having a bottom surface having the same size as the base portion.
  • the end mill according to the present disclosure has a plurality of flat surfaces at the tip portion. Each corner of a plurality of planes is located on a virtual hemisphere.
  • the distance difference between the distance from the corner of the first plane to the center of the hemisphere included in multiple planes and the distance from the first plane to the center of the hemisphere along the perpendicular of the first plane is 3 ⁇ m or more. It is 10 ⁇ m or less.
  • the "hemispherical surface” in the present specification means a surface having a height different from the height of the spherical surface by cutting a part of the spherical surface by a plane. Therefore, the term “hemispherical surface” as used herein is not limited to the case where the height of the hemispherical surface is equal to the radius of the spherical surface, and may be larger or smaller than the radius of the spherical surface.
  • FIG. 1 is a perspective view showing a configuration in the vicinity of the tip end portion of the end mill according to the embodiment.
  • FIG. 2 is a side view of the tip end portion of the end mill according to the embodiment as viewed from the side.
  • FIG. 3 is a view of the tip end portion of the end mill according to the embodiment as viewed from the tip end.
  • FIG. 4 is a cross-sectional view showing the configuration of the tip end portion of the end mill according to the embodiment.
  • the unevenness of the surface roughness formed on the grinding execution surface performs grinding processing on the work material.
  • the grindstone is ground in this way, it is difficult to maintain the state of the grindstone abrasive grains.
  • the unevenness of the surface roughness on the grinding execution surface it is difficult to maintain the state because the unevenness is small in order to maintain the performance as the blade portion.
  • the roundness of the ball shape formed by the grinding wheel is deteriorated by the overall unevenness. From the above, it is difficult to obtain stable processed quality.
  • the tip of the cutting edge is too sharp.
  • the cutting edge may be damaged due to the contact at the start of processing, the back component force at the time of processing, and the like.
  • the tip portion tends to be chipped because the processing speed at the time of processing becomes zero. Therefore, it becomes difficult to maintain the quality or shape of the machined surface.
  • the shape is aimed at the effect of the back component force.
  • the drill shape has an acute angle toward the tip, so that the speed is low near the tip (near the center of the tool axis).
  • the tip since the tip is in a zero speed state, there is a risk of loss if the feed component force is applied.
  • the turning point is used as a cutting edge, the distance to the center of the tool fluctuates, the cutting stress is not constant, and the machining quality varies.
  • An object of the present disclosure is to provide an end mill capable of obtaining high efficiency and high processed quality. [Effect of this disclosure] According to the present disclosure, it is possible to realize an end mill capable of obtaining high efficiency and high processing quality. [Explanation of Embodiments of the present disclosure] First, the embodiments of the present disclosure will be listed and described.
  • the end mill 1 of the present disclosure has a plurality of planes S on the tip portion TI.
  • Each angle C of the plurality of planes S is located on the virtual hemispherical HE.
  • the distance difference ⁇ L from the distance LB from the first plane (for example, plane SA) to the center CE of the hemispherical surface HE is 3 ⁇ m or more and 10 ⁇ m or less.
  • each angle C of the plurality of planes S is located on the virtual hemispherical surface HE. For this reason, vanishing processing with a substantially hemispherical shape becomes possible, and processing with high processing quality becomes possible.
  • the distance difference ⁇ L is 3 ⁇ m or more. As a result, a large depth of cut can be secured, and processing with high efficiency becomes possible. Further, since the distance difference ⁇ L is 10 ⁇ m or less, it is possible to maintain high processed quality while increasing the depth of cut.
  • the plurality of planes S are made of a material containing at least one of cubic boron nitride and polycrystalline diamond.
  • the distance difference ⁇ L is 3 ⁇ m or more and 5 ⁇ m or less
  • the particle size of the particles contained in the material is 0.05 ⁇ m or more and 1 ⁇ m or less.
  • the sharpness can be selectively improved and the processed quality can be improved by utilizing the fine grain material with the particle size of the particles set to 0.05 ⁇ m or more and 1 ⁇ m or less. .. Further, by setting the distance difference ⁇ L to 5 ⁇ m or less, high-quality processing such as a mirror surface becomes possible.
  • the distance difference ⁇ L is larger than 5 ⁇ m and 10 ⁇ m or less, and the particle size of the particles contained in the material is larger than 1 ⁇ m.
  • the cutting edge amount increases but the cutting edge resistance increases because the distance difference ⁇ L becomes larger than 5 ⁇ m. Therefore, by utilizing a coarse-grained grade having a particle size larger than 1 ⁇ m, the rigidity of the material is improved and the processed quality by burnishing is improved.
  • the distance difference ⁇ L is 7 ⁇ m or less.
  • the distance difference ⁇ L is 7 ⁇ m or less, it is possible to obtain a larger cutting edge strength.
  • the plurality of planes S include a second plane (for example, plane SB) adjacent to the first plane (for example, plane SA).
  • the angle ⁇ formed by the first plane (for example, plane SA) and the second plane (for example, plane SB) is an obtuse angle.
  • the angle ⁇ formed by the first plane (for example, the plane SA) and the second plane (for example, the plane SB) adjacent to each other is an obtuse angle, the cutting edge strength is improved.
  • FIG. 1 is a perspective view showing a configuration near the tip of an end mill according to an embodiment.
  • 2 and 3 are a side view of the tip end portion of the end mill according to the embodiment as viewed from the side and a view of the tip end portion as viewed from the tip side.
  • FIG. 4 is a cross-sectional view showing the configuration of the tip end portion of the end mill according to the embodiment.
  • the end mill 1 has a plurality of planes S on the tip portion TI.
  • the plurality of planes S are the plane SA of the first group, the plane SB of the second group, the plane SC of the third group, the plane SD of the fourth group, the plane SE of the fifth group, and the plane SE of the sixth group. It has a plane SF.
  • the plane SA of the first group, the plane SB of the second group, the plane SC of the third group, the plane SD of the fourth group, the plane SE of the fifth group and the plane SF of the sixth group are , Are arranged in this order from the tip of the end mill 1 toward the root side (shank side) along the axial direction AD of the end mill 1.
  • the planes of the six groups from the plane SA of the first group to the plane SF of the sixth group are arranged along the axial AD
  • a plurality of groups will be described along the axial AD. It suffices if the planes of are lined up. For example, the planes of 5 or less groups may be lined up along the axial direction AD, or the planes of 7 or more groups may be lined up.
  • the plane SA of the first group is composed of a plurality of plane SAs.
  • the plane SB of the second group is composed of a plurality of plane SBs.
  • the plane SC of the third group is composed of a plurality of plane SCs.
  • the plane SD of the fourth group is composed of a plurality of plane SDs.
  • the plane SE of the fifth group is composed of a plurality of plane SEs.
  • the plane SF of the sixth group is composed of a plurality of plane SFs.
  • the number of the plurality of planes SA is the same as the number of the plurality of planes SB, the number of the plurality of planes SC, the number of the plurality of planes SD, the number of the plurality of planes SE, and the number of the plurality of planes SF.
  • the plane SA of the first group constitutes a pyramid by a plurality of plane SAs.
  • the apex of the pyramid is located on the central axis AX of the end mill 1 as shown in FIG.
  • the center axis AX of the end mill 1 is an axis that becomes the rotation center of the end mill 1 during processing by the end mill 1.
  • the central axis AX of the end mill 1 is a line passing through the center of a circular cross section obtained by cutting the end mill 1 having a substantially cylindrical shape with a cross section perpendicular to the axial direction.
  • the plane SB of the second group constitutes a pyramid base by a plurality of plane SBs.
  • the upper surface of the pyramid base composed of the plane SB of the second group is connected to the bottom surface of the pyramid formed of the plane SA of the first group.
  • the upper surface of the regular polygonal shape of the pyramid base composed of the plane SB of the second group has the same shape as the bottom surface of the regular polygonal shape of the pyramid formed of the plane SA of the first group.
  • the plane SC of the third group constitutes a pyramid base by a plurality of plane SCs.
  • the upper surface of the pyramid table composed of the plane SC of the third group is connected to the bottom surface of the pyramid table composed of the plane SB of the second group.
  • the upper surface of the regular polygonal shape of the pyramid base composed of the plane SC of the third group has the same shape as the bottom surface of the regular polygonal shape of the pyramidal base composed of the plane SB of the second group.
  • the plane SD of the 4th group constitutes a pyramid base by a plurality of plane SDs.
  • the upper surface of the pyramid pedestal composed of the plane SD of the fourth group is connected to the bottom surface of the pyramid pedestal composed of the plane SC of the third group.
  • the upper surface of the regular polygonal shape of the pyramid base composed of the plane SD of the fourth group has the same shape as the bottom surface of the regular polygonal shape of the pyramidal base composed of the plane SC of the third group.
  • the plane SE of the 5th group constitutes a pyramid base by a plurality of plane SEs.
  • the upper surface of the pyramid pedestal composed of the plane SE of the fifth group is connected to the bottom surface of the pyramid pedestal composed of the plane SD of the fourth group.
  • the upper surface of the regular polygonal shape of the pyramid base composed of the plane SE of the fifth group has the same shape as the bottom surface of the regular polygonal shape of the pyramidal base composed of the plane SD of the fourth group.
  • the plane SF of the 6th group constitutes a pyramid base by a plurality of plane SFs.
  • the upper surface of the pyramid pedestal composed of the plane SF of the sixth group is connected to the bottom surface of the pyramid pedestal formed of the plane SE of the fifth group.
  • the upper surface of the regular polygonal shape of the pyramid base composed of the plane SF of the sixth group has the same shape as the bottom surface of the regular polygonal shape of the pyramidal base composed of the plane SE of the fifth group.
  • a plurality of plane SAs are arranged side by side along the circumferential direction CD centered on the central axis AX.
  • Each of the plurality of planes SA has the same shape as each other, and has, for example, an isosceles triangle shape.
  • Each of the plurality of planes SA has an angle C1 as an apex angle and two angles C2 as a base angle.
  • each angle C1 of the plurality of planes SA is connected at a common intersection, and the intersection is located on the central axis AX of the end mill 1.
  • the bottom surface of the cone composed of the plurality of corners C2 has a regular polygonal shape as shown in FIG.
  • a plurality of plane SBs are arranged side by side along the circumferential direction CD centered on the central axis AX.
  • Each of the plurality of plane SBs has the same shape as each other, and has, for example, an isosceles trapezoidal shape.
  • Each of the plurality of plane SBs has two corners C2 located on the upper base of the trapezoid and two corners C3 located on the lower base of the trapezoid.
  • the size of the upper base of the trapezoid in each of the plurality of plane SBs is smaller than the size of the lower base.
  • the two plane SBs adjacent to each other are arranged so that the corners C2 are connected to each other, the corners C3 are connected to each other, and the isosceles trapezoidal legs are connected to each other. Further, each of the corners C2 in the plurality of planes SB is connected to the corners C2 in the plane SA at a common intersection. Further, the base of the isosceles triangle in the plane SA and the upper base of the isosceles trapezoid in the plane SB have the same dimensions and are connected to each other.
  • a plurality of plane SCs are arranged side by side along the circumferential direction CD centered on the central axis AX.
  • Each of the plurality of plane SCs has the same shape as each other, and has, for example, an isosceles trapezoidal shape.
  • Each of the plurality of planes SC has two corners C3 located on the upper base of the trapezoid and two corners C4 located on the lower base of the trapezoid.
  • the dimension of the upper base of the trapezoid in each of the plurality of plane SCs is smaller than the dimension of the lower base.
  • the two plane SCs adjacent to each other are arranged so that the corners C3 are connected to each other, the corners C4 are connected to each other, and the isosceles trapezoidal legs are connected to each other. Further, each of the angles C3 in the plurality of planes SC is connected to the angle C3 in the plane SB at a common intersection. Further, the lower base of the isosceles trapezoid in the plane SB and the upper base of the isosceles trapezoid in the plane SC have the same dimensions and are connected to each other.
  • a plurality of plane SDs are arranged side by side along the circumferential direction CD centered on the central axis AX.
  • Each of the plurality of planar SDs has the same shape as each other, and has, for example, an isosceles trapezoidal shape.
  • Each of the plurality of plane SDs has two corners C4 located on the upper base of the trapezoid and two corners C5 located on the lower base of the trapezoid.
  • the size of the upper base of the trapezoid in each of the plurality of plane SDs is smaller than the size of the lower base.
  • the two plane SDs adjacent to each other are arranged so that the corners C4 are connected to each other, the corners C5 are connected to each other, and the isosceles trapezoidal legs are connected to each other. Further, each of the angles C4 in the plurality of planes SD is connected to the corners C4 in the plane SC at a common intersection. Further, the lower base of the isosceles trapezoid in the plane SC and the upper base of the isosceles trapezoid in the plane SD have the same dimensions and are connected to each other.
  • a plurality of plane SEs are arranged side by side along the circumferential direction CD centered on the central axis AX.
  • Each of the plurality of plane SEs has the same shape as each other, and has, for example, an isosceles trapezoidal shape.
  • Each of the plurality of planes SE has two angles C5 located on the upper base of the trapezoid and two angles C6 located on the lower base of the trapezoid.
  • the dimension of the upper base of the trapezoid in each of the plurality of plane SEs is smaller than the dimension of the lower base.
  • the two plane SEs adjacent to each other are arranged so that the corners C5 are connected to each other, the corners C6 are connected to each other, and the isosceles trapezoidal legs are connected to each other. Further, each of the angles C5 in the plurality of planes SE is connected to the angle C5 in the plane SD at a common intersection. Further, the lower base of the isosceles trapezoid in the plane SD and the upper base of the isosceles trapezoid in the plane SE have the same dimensions and are connected to each other.
  • a plurality of plane SFs are arranged side by side along the circumferential direction CD centered on the central axis AX.
  • Each of the plurality of plane SFs has the same shape as each other, and has, for example, an isosceles trapezoidal shape.
  • Each of the plurality of plane SFs has two angles C6 located on the upper base of the trapezoid and two angles C7 located on the lower base of the trapezoid.
  • the dimension of the upper base of the trapezoid in each of the plurality of plane SFs is smaller than the dimension of the lower base.
  • the two plane SFs adjacent to each other are arranged so that the corners C6 are connected to each other, the corners C7 are connected to each other, and the isosceles trapezoidal legs are connected to each other. Further, each of the angles C6 in the plurality of planes SF is connected to the angle C6 in the plane SE at a common intersection. Further, the lower base of the isosceles trapezoid in the plane SE and the upper base of the isosceles trapezoid in the plane SF have the same dimensions and are connected to each other.
  • each angle C of the plurality of planes S is located on the virtual hemispherical surface HE.
  • all of the plurality of angles C1 to C7 are located on the virtual hemispherical surface HE.
  • intersection of the plurality of planes S (for example, the angle C shared by the angle C of each of the four planes S) becomes a convex portion, and the portion of the plane S other than the angle C becomes a concave portion.
  • Each of the plurality of angles C becomes a blade portion by forming a convex portion.
  • the cutting amount can be adjusted by adjusting the amount of protrusion of the convex portion from the plane S.
  • the distance difference ⁇ L from the distance LB from the plane SA) to the center CE of the hemispherical surface HE is 3 ⁇ m or more and 10 ⁇ m or less. That is, the distance difference ⁇ L is represented by LA-LB and is 3 ⁇ m or more and 10 ⁇ m or less.
  • the distance difference ⁇ L and the distances LA and LB are shown for the plane SA, but the distance difference ⁇ L is similarly 3 ⁇ m or more and 10 ⁇ m or less for each of the planes SB, SC, SD, SE, and SF. ing. Further, the distance difference ⁇ L may be 7 ⁇ m or less.
  • Each of the plurality of planes S is composed of a material containing at least one of cubic boron nitride (CBN) and polycrystalline diamond (PCD).
  • CBN cubic boron nitride
  • PCD polycrystalline diamond
  • the "material containing at least one of cubic boron nitride and polycrystalline diamond” includes a material containing cubic boron nitride and not containing polycrystalline diamond, a material containing polycrystalline diamond, and cubic boron nitride. Three cases are included: materials not included, and materials containing both cubic boron nitride and polycrystalline diamond.
  • the "material containing at least one of cubic boron nitride and polycrystalline diamond” is, for example, a sintered body.
  • the entire tip TI of the end mill 1 may be made of a material containing at least one of cubic boron nitride and polycrystalline diamond. Further, the tip TI in the end mill 1 may be composed of a base material such as cemented carbide and at least one of cubic boron nitride and polycrystalline diamond that coats the surface of the base material. In short, the plane S to be the surface of the tip portion TI in the end mill 1 may be made of a material containing at least one of cubic boron nitride and polycrystalline diamond.
  • the plane S made of a material containing at least one of cubic boron nitride and polycrystalline diamond may be attached to a base material made of cemented carbide or the like by, for example, brazing.
  • the particle size of the particles contained in the material containing at least one of cubic boron nitride and polycrystalline diamond is preferably 0.05 ⁇ m or more and 1 ⁇ m or less.
  • the particles contained in the material containing at least one of the cubic boron nitride and the polycrystalline diamond are at least one of the cubic boron nitride particles and the diamond particles.
  • the particle size of the particles contained in the material containing at least one of cubic boron nitride and polycrystalline diamond is larger than 1 ⁇ m.
  • the angle formed by the planes adjacent to each other among the plurality of planes S is an obtuse angle.
  • the angle ⁇ formed by the plane SA and the plane SB is an obtuse angle.
  • the angle formed by the plane SB and the plane SC, the angle formed by the plane SC and the plane SD, the angle formed by the plane SD and the plane SE, and the angle formed by the plane SE and the plane SF are also obtuse angles.
  • the angle formed by the plane SAs adjacent to each other in the plane SA of the first group is also an obtuse angle.
  • the angle between the planes SAs adjacent to each other, the angle between the planes SCs adjacent to each other, the angle between the planes SDs adjacent to each other, the angle between the planes SEs adjacent to each other, and the planes SFs adjacent to each other is also blunt.
  • the diameter of the end mill 1 (diameter of the hemispherical HE) is, for example, 0.2 mm or more and 2.0 mm or less.
  • angles C of the plurality of planes S are located on the virtual hemispherical surface HE in the entire tip portion TI, but in a part of the tip portion TI.
  • the angles C of the plurality of planes S may be located on the virtual hemispherical surface HE. That is, the angles C of the plurality of planes S may be located on a virtual partial spherical surface in a part of the tip portion TI.
  • the shape of the tip portion TI composed of a combination of a plurality of planes S can be manufactured by polyhedral grinding, for example, by performing ultra-polyhedral processing.
  • the shape of the tip portion TI composed of a combination of a plurality of planes S has a correlation between the turning speed and the rotation speed when processing into the shape, and the turning shaft and the rotating shaft operate in synchronization with each other. Obtained by
  • the intersection of a plurality of planes S (for example, the angle C shared by the angle C of each of the four planes S) becomes a convex portion, and the convex portion thereof.
  • the part becomes the blade part.
  • the cut can be made, and the cut amount can be adjusted by adjusting the amount of protrusion of the convex portion from the plane S.
  • each angle C of the plurality of planes S is located on the virtual hemispherical surface HE. For this reason, vanishing processing with a substantially hemispherical shape becomes possible, and processing with high processing quality becomes possible.
  • the distance difference ⁇ L is 3 ⁇ m or more. As a result, a large depth of cut can be secured, and processing with high efficiency becomes possible. Further, since the distance difference ⁇ L is 10 ⁇ m or less, it is possible to maintain high processed quality while increasing the depth of cut.
  • the distance difference ⁇ L is 10 ⁇ m or less, it is possible to secure high cutting edge strength.
  • the tip portion TI is composed of a combination of a plurality of planes S, the angle C becomes a convex portion, and the portion of the plane S other than the angle C becomes a concave portion, a shape that does not hit the entire surface can be obtained. Therefore, the cutting resistance can be reduced. Further, since the grinding water can be turned into the flat surface S between the angle C (blade portion) and the angle C (blade portion), a grade cooling effect can be expected. Further, by applying post-treatment (cutting edge treatment or the like) to the convex portion formed by the corner C, the convex portion can be made into a round shape (rounded shape) instead of being sharp. This can be expected to improve the mirror surface workability.
  • the plurality of planes S are made of a material containing at least one of cubic boron nitride and polycrystalline diamond. This makes it possible to cut high-hardness materials such as hardened steel.
  • the distance difference ⁇ L is 3 ⁇ m or more and 5 ⁇ m or less
  • the particle size of the particles (cubic boron nitride particles, diamond particles) contained in the material is 0.05 ⁇ m or more and 1 ⁇ m or less. Is.
  • the sharpness can be selectively improved and the processed quality can be improved. Further, by setting the distance difference ⁇ L to 5 ⁇ m or less, high quality like a mirror surface becomes possible.
  • the distance difference ⁇ L is larger than 5 ⁇ m and 10 ⁇ m or less, and the particle size of the particles (cubic boron nitride particles, diamond particles) contained in the material is larger than 1 ⁇ m.
  • the distance difference ⁇ L becomes larger than 5 ⁇ m in this way, the depth of cut increases, but the cutting edge resistance increases. Therefore, by utilizing a coarse-grained grade having a particle size larger than 1 ⁇ m, the rigidity of the material is improved and the processed quality by burnishing is improved. Further, by making the particle size of the particles larger than 1 ⁇ m, the strength of the cutting edge is increased and the contact amount (point) is reduced, so that the resistance can be reduced.
  • the distance difference ⁇ L is 7 ⁇ m or less. This makes it possible to obtain even greater cutting edge strength.
  • the plurality of planes S include a second plane (for example, plane SB) adjacent to the first plane (for example, plane SA).
  • the angle ⁇ formed by the first plane (for example, plane SA) and the second plane (for example, plane SB) is an obtuse angle.
  • the cutting edge strength is improved.
  • Samples of multiple end mills were prepared.
  • the tip portion of the end mill was composed of a combination of a plurality of planes.
  • all the corners of the plurality of planes were positioned on a virtual hemisphere in the entire tip portion of the end mill.
  • the radius of the hemisphere was 0.5 mm.
  • All of the planes were composed of a sintered body of cubic boron nitride.
  • ⁇ Evaluation method> The work material was cut using the end mill of the above sample.
  • SKD11 Rockwell hardness HRC55
  • JIS Japanese Industrial Standards
  • the rotation speed of the end mill in cutting was set to 40,000 rpm
  • the feed amount was set to 400 mm / min.
  • the processing shape in the cutting process is a ⁇ 4 mm hemispherical lens type groove.
  • the evaluation when the surface roughness Ra on the machined surface is larger than 0.1 ⁇ m with respect to the machined surface quality is defined as “C”, and when it is 0.05 ⁇ m or more and 0.1 ⁇ m or less.
  • the distance difference ⁇ L is 3 ⁇ m or more and 10 ⁇ m or less, it has been found that a large cuttable amount can be secured, so that high cutting efficiency can be obtained and good machined surface quality can be obtained.
  • AD axial direction AX central axis, C, C1, C2, C3, C4, C5, C6, C7 angle, CD circumferential direction, CE center, HE hemisphere, LA, LB distance, PE vertical line, S, SA, SB, SC, SD, SE, SF plane, TI tip.

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Abstract

Une fraise d'extrémité selon la présente invention comporte une pluralité de surfaces plates sur une section de pointe de celle-ci. Des angles de chacune de la pluralité de sections plates sont positionnés sur un plan semi-sphérique virtuel. La différence de distances entre la distance de l'angle de chacune de la pluralité de surfaces plates au centre du plan semi-sphérique et la distance d'une surface plate au centre du plan semi-sphérique le long d'une ligne perpendiculaire à la surface plate est de 3 à 10 µm, inclus.
PCT/JP2020/024134 2020-06-19 2020-06-19 Fraise d'extrémité WO2021255919A1 (fr)

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