WO2019180872A1 - エンドミル - Google Patents
エンドミル Download PDFInfo
- Publication number
- WO2019180872A1 WO2019180872A1 PCT/JP2018/011398 JP2018011398W WO2019180872A1 WO 2019180872 A1 WO2019180872 A1 WO 2019180872A1 JP 2018011398 W JP2018011398 W JP 2018011398W WO 2019180872 A1 WO2019180872 A1 WO 2019180872A1
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- WIPO (PCT)
- Prior art keywords
- end mill
- outer peripheral
- diameter
- continuous
- rotation axis
- 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
- B23B—TURNING; BORING
- B23B47/00—Constructional features of components specially designed for boring or drilling machines; Accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/28—Features relating to lubricating or cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/10—Arrangements for cooling or lubricating tools or work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2231/00—Details of chucks, toolholder shanks or tool shanks
- B23B2231/24—Cooling or lubrication means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2210/00—Details of milling cutters
- B23C2210/03—Cutting heads comprised of different material than the shank irrespective of whether the head is detachable from the shank
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2210/00—Details of milling cutters
- B23C2210/72—Rotatable in both directions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2226/00—Materials of tools or workpieces not comprising a metal
- B23C2226/12—Boron nitride
- B23C2226/125—Boron nitride cubic [CBN]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2226/00—Materials of tools or workpieces not comprising a metal
- B23C2226/31—Diamond
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2226/00—Materials of tools or workpieces not comprising a metal
- B23C2226/31—Diamond
- B23C2226/315—Diamond polycrystalline [PCD]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2250/00—Compensating adverse effects during milling
- B23C2250/12—Cooling and lubrication
Definitions
- This disclosure relates to an end mill.
- Patent Document 1 describes an end mill for processing a hard and brittle material.
- the end mill has an oil hole at the center of the cutting edge.
- the end mill includes a shank and a cutting blade body.
- the cutting blade body is provided on the shank and has a coolant supply path.
- the cutting blade main body includes a rear end surface on the shank side and a front end surface opposite to the rear end surface.
- the coolant supply path has a tapered portion that expands in the direction from the rear end surface toward the front end surface.
- FIG. 4 is a schematic end view taken along line IV-IV in FIG. 3.
- FIG. 5 is a schematic end face view taken along line VV in FIG. 3.
- FIG. 7 is a schematic end face view taken along line VII-VII in FIG. 6.
- FIG. 7 is a schematic end face view taken along line VIII-VIII in FIG. 6.
- FIG. 10 is a schematic end face view taken along line XX in FIG. 9.
- FIG. 10 is a schematic end face view taken along line XI-XI in FIG. 9.
- FIG. 13 is a schematic end face view taken along line XIII-XIII in FIG. 12.
- FIG. 13 is a schematic end face view taken along line XIV-XIV in FIG. 12.
- It is an expansion perspective schematic diagram near the cutting-blade main-body part of the end mill which concerns on 5th Embodiment.
- FIG. 13 is a front schematic diagram of the end mill which concerns on 5th Embodiment.
- FIG. 17 is a schematic end view taken along the line XVII-XVII in FIG. 16.
- FIG. 17 is a schematic end face view taken along line XVIII-XVIII in FIG. 16.
- FIG. 20 is a schematic end face view taken along line XX-XX in FIG. 19.
- FIG. 20 is a schematic end face view taken along line XXI-XXI in FIG. 19.
- FIG. 23 is a schematic end face view taken along line XXIII-XXIII in FIG.
- FIG. 24 is a schematic end face view taken along line XXIV-XXIV in FIG. 22.
- FIG. 27 is a schematic end face view taken along line XXVII-XVII in FIG. 26.
- FIG. 27 is a schematic end face view taken along line XXVIII-XXVIII in FIG. 26.
- FIG. 30 is a schematic end face view taken along line XXX-XXX in FIG. 29.
- FIG. 30 is a schematic end face view taken along the line XXXI-XXXI in FIG. 29.
- An embodiment of the present invention has been made to solve the above-described problems, and an object thereof is to provide a long-life end mill.
- a long-life end mill can be provided.
- the end mill 1 includes a shank 10 and a cutting blade body 50.
- the cutting blade main body 50 is provided on the shank 10 and has a coolant supply path 40.
- the cutting blade main body 50 includes a rear end surface 32 on the shank 10 side and a front end surface 21 opposite to the rear end surface 32.
- the coolant supply path 40 has a tapered portion 41 that expands in the direction from the rear end surface 32 toward the front end surface 21.
- the coolant supply path 40 has the tapered portion 41 that expands in the direction from the rear end surface 32 toward the front end surface 21.
- the cutting blade body 50 may include an outer peripheral surface 33 that is continuous with the rear end surface 32 and that is provided around the rotation axis A.
- the cutting blade main body 50 includes a base portion 30 having a rear end surface 32 and a bottom surface 31 opposite to the rear end surface 32, and a cutting provided on the bottom surface 31.
- the blade part 20 may be included.
- the bottom surface 31 may be continuous with the tapered portion 41, may be inclined with respect to the tapered portion 41, and may be continuous with the outer peripheral surface 33.
- the boundary 34 between the bottom surface 31 and the tapered portion 41 is the inner peripheral portion 27 of the cutting edge portion 20 and the outer peripheral surface when viewed from the direction parallel to the rotation axis A. 33 may be located.
- coolant can be effectively supplied to both the inner peripheral side and outer peripheral side cutting blades. Therefore, the cooling efficiency of the cutting blade is further increased, and the life of the end mill 1 can be further extended.
- the bottom surface 31 may have a first bottom surface portion 35 continuous with the taper portion 41 and a second bottom surface portion 36 continuous with the outer peripheral surface 33. In the direction parallel to the rotation axis A, the distance from the tip surface 21 to the first bottom surface portion 35 may be longer than the distance from the tip surface 21 to the second bottom surface portion 36.
- the first bottom surface portion 35 may be continuous with the cutting edge portion 20 and may be separated from the outer peripheral surface 33. Thereby, coolant can be effectively supplied near the cutting edge. Therefore, the cooling efficiency of the cutting blade is further increased, and the life of the end mill 1 can be further extended.
- the first bottom surface portion 35 may be continuous with each of the cutting edge portion 20 and the outer peripheral surface 33.
- the first bottom surface portion 35 may be separated from the cutting edge portion 20 and connected to the outer peripheral surface 33.
- the outer peripheral surface 33 may be provided with an outer peripheral groove 38 continuous with the bottom surface 31.
- the height of the cutting edge portion 20 in the direction parallel to the rotation axis A is defined as the first height T1 and parallel to the rotation axis A.
- the value obtained by dividing the first height T1 by the first depth T2 may be 0.1 or more and 200 or less.
- the diameter of the cutting blade body 50 in the direction perpendicular to the rotation axis A is the first diameter D1, and is perpendicular to the rotation axis A.
- the maximum value of the diameter of the tapered portion 41 in the direction is the second diameter D2
- the value obtained by dividing the second diameter D2 by the first diameter D1 may be 0.005 or more and 3 or less.
- the coolant supply path 40 may include the cylindrical portion 42 that is continuous with the tapered portion 41 on the rear end face 32 side and extends along the rotation axis A. Good.
- the diameter of the cylindrical portion 42 in the direction perpendicular to the rotation axis A is the third diameter D3
- the value obtained by dividing the third diameter D3 by the first diameter D1 may be 0.005 or more and 3 or less.
- the second diameter D2 is larger than the third diameter D3.
- the material constituting the cutting blade main body 50 is any one of polycrystalline diamond, single crystal diamond, and cubic boron nitride. May be.
- the material constituting the cutting blade body 50 may be polycrystalline diamond.
- the average grain size of the polycrystalline diamond may be 1 ⁇ m or less.
- the work material is an iron-based material
- diamond and iron are highly reactive, so the cutting edge may be significantly worn. Therefore, in the end mill 1 in which the work material is an iron-based material and the cutting blade body 50 is made of diamond, the effect of suppressing wear is particularly high.
- FIG. 1 is a schematic perspective view of an end mill 1 according to the first embodiment.
- FIG. 2 is an enlarged perspective schematic view of the vicinity of the cutting blade body 50 of the end mill 1 according to the first embodiment.
- FIG. 3 is a schematic front view of the end mill 1 according to the first embodiment.
- the end mill 1 according to the first embodiment is a rotary cutting tool used for processing hard brittle materials such as cemented carbide or hardened steel.
- the end mill 1 according to the first embodiment is configured to be rotatable around a rotation axis A, and mainly includes a shank 10 and a cutting blade body 50.
- the cutting blade main body 50 is provided on the shank 10.
- the diameter of the cutting blade main body 50 is, for example, 6 mm or less.
- the cutting blade body 50 has a cutting blade side coolant supply path 40.
- the shank 10 is composed of, for example, a first shank portion 11 and a second shank portion 12.
- the second shank part 12 is provided on the first shank part 11.
- Each of the 1st shank part 11 and the 2nd shank part 12 is cylindrical.
- the diameter of the first shank part 11 is larger than the diameter of the second shank part 12.
- the first shank part 11 has a first main surface 11a, a second main surface 11b, and a first outer peripheral part 11c.
- the second main surface 11b is a surface opposite to the first main surface 11a.
- the first outer peripheral portion 11 c is provided around the rotation axis A.
- the 2nd shank part 12 has the 3rd main surface 12a, the 4th main surface 12b, and the 2nd outer peripheral part 12c.
- the fourth main surface 12b is a surface opposite to the third main surface 12a.
- the first main surface 11 a of the first shank part 11 is in contact with the fourth main surface 12 b of the second shank part 12.
- the shank 10 is provided with a shank side coolant supply path 43.
- the shank side coolant supply path 43 extends from the second main surface 11b to the third main surface 12a.
- the shank side coolant supply path 43 is continuous with the cutting edge side coolant supply path 40.
- the coolant is introduced from the opening of the shank side coolant supply path 43 provided on the second main surface 11b.
- the coolant may be a liquid or a gas. When the coolant is a liquid, the liquid may be water-soluble or oily.
- the cutting blade main body 50 mainly has a front end surface 21 and a rear end surface 32.
- the rear end face 32 is a face on the shank 10 side.
- the rear end face 32 faces the shank 10.
- the rear end surface 32 is joined to the third main surface 12a of the shank 10 by brazing, for example.
- the front end surface 21 is a surface opposite to the rear end surface 32.
- the cutting blade main body 50 is composed of a base portion 30 and a cutting blade portion 20.
- the cutting edge part 20 is provided on the base part 30.
- the base 30 has a rear end surface 32, a bottom surface 31, and an outer peripheral surface 33.
- the bottom surface 31 is a surface opposite to the rear end surface 32.
- the bottom surface 31 is, for example, a surface parallel to the tip surface 21.
- the bottom surface 31 may be parallel to a plane perpendicular to the rotation axis A.
- the outer peripheral surface 33 is continuous with each of the bottom surface 31 and the rear end surface 32.
- the outer peripheral surface 33 is provided around the rotation axis A.
- the cutting edge portion 20 is provided on the bottom surface 31.
- the number of cutting blade portions 20 is, for example, four. In this case, the cutting edge part 20 is arrange
- the number of the cutting blade portions 20 is not particularly limited.
- the number of the cutting blade portions 20 may be six or eight.
- the cutting blade portions 20 are arranged at regular intervals in the circumferential direction, for example.
- the cutting edge portion 20 includes a tip surface 21, a first side surface 22, a second side surface 23, an outer peripheral portion 28 (see FIG. 4), an inner peripheral portion 27,
- the first bottom blade 24, the second bottom blade 25, and the outer peripheral blade 26 are mainly included.
- the inner peripheral portion 27 is a ridge line between the first side surface 22 and the second side surface 23.
- the first bottom blade 24 is a ridge line between the first side surface 22 and the tip surface 21.
- the second bottom blade 25 is a ridge line between the second side surface 23 and the tip surface 21.
- the outer peripheral edge 26 is a ridge line between the outer peripheral portion 28 and the distal end surface 21. As shown in FIG.
- the shape of the tip surface 21 is, for example, a fan shape.
- the first bottom blade 24 and the second bottom blade 25 are, for example, linear.
- the outer peripheral blade 26 has, for example, an arc shape.
- the first side surface 22 functions as a rake surface
- each of the first bottom blade 24 and the outer peripheral blade 26 functions as an effective cutting blade.
- the second side surface 23 functions as a rake surface.
- Each of the second bottom blade 25 and the outer peripheral blade 26 functions as an effective cutting blade.
- FIG. 4 is a schematic end view taken along line IV-IV in FIG.
- FIG. 5 is a schematic end face view taken along the line VV of FIG.
- the coolant supply path 40 includes a tapered portion 41 and a tubular portion 42.
- the tapered portion 41 is a portion that expands in the direction from the rear end surface 32 toward the front end surface 21.
- the taper portion 41 extends along a straight line that is inclined with respect to the rotation axis A, for example.
- the width of the tapered portion 41 in the direction perpendicular to the rotation axis A increases in the direction from the rear end surface 32 toward the front end surface 21.
- the tapered portion 41 is continuous with the bottom surface 31.
- the bottom surface 31 is inclined with respect to the tapered portion 41.
- the tubular portion 42 is continuous with the tapered portion 41 on the rear end face 32 side of the base portion 30.
- the cylindrical portion 42 extends along the rotation axis A. From another point of view, the cylindrical portion 42 surrounds the rotation axis A.
- the tubular portion 42 is continuous with the rear end surface 32.
- the boundary portion 34 between the bottom surface 31 and the tapered portion 41 is located on the inner peripheral side with respect to the inner peripheral portion 27 of the cutting blade portion 20 when viewed from the direction parallel to the rotation axis A. May be. From another viewpoint, when viewed from a direction parallel to the rotation axis A, the boundary portion 34 between the bottom surface 31 and the tapered portion 41 is between the inner peripheral portion 27 of the cutting blade portion 20 and the tubular portion 42. May be located. As shown in FIG. 4, when viewed from the direction perpendicular to the rotation axis A, the boundary portion 34 between the bottom surface 31 and the tapered portion 41 is between the inner peripheral portion 27 of the cutting edge portion 20 and the rotation axis A. May be located.
- the height of the cutting edge portion 20 in the direction parallel to the rotation axis A is the first height T1
- the depth of the taper portion 41 in the direction parallel to the rotation axis A is the first depth.
- a value obtained by dividing the first height T1 by the first depth T2 is, for example, 0.1 or more and 200 or less.
- the upper limit of the value obtained by dividing the first height T1 by the first depth T2 is not particularly limited, but may be, for example, 100 or less, or 50 or less.
- divided 1st height T1 by 1st depth T2 is not specifically limited, For example, 1 or more may be sufficient and 10 or more may be sufficient.
- the height of the cutting edge 20 is the distance from the bottom surface 31 to the tip surface 21 in the direction parallel to the rotation axis A.
- the second diameter A value obtained by dividing D2 by the first diameter D1 is, for example, 0.005 or more and 3 or less.
- the upper limit of the value obtained by dividing the second diameter D2 by the first diameter D1 is not particularly limited, but may be 1 or less, for example, or 0.5 or less.
- the lower limit of the value obtained by dividing the second diameter D2 by the first diameter D1 is not particularly limited, but may be, for example, 0.01 or more, or 0.1 or more.
- a value obtained by dividing the third diameter D3 by the first diameter D1 is, for example, 0.005 or more and 3 or less.
- the upper limit of the value obtained by dividing the third diameter D3 by the first diameter D1 is not particularly limited, but may be 1 or less, for example, or 0.5 or less.
- the lower limit of the value obtained by dividing the third diameter D3 by the first diameter D1 is not particularly limited, but may be, for example, 0.01 or more, or 0.1 or more.
- the second diameter D2 is larger than the third diameter D3.
- the material constituting the cutting blade body 50 is, for example, polycrystalline diamond, single crystal diamond, cubic boron nitride, or the like.
- the material which comprises the cutting-blade main-body part 50 is a binderless polycrystalline nano diamond sintered compact.
- the average particle diameter of polycrystalline diamond is, for example, 1 ⁇ m or less.
- the average particle diameter of the polycrystalline diamond is not particularly limited, but may be, for example, 0.1 ⁇ m or less, or 0.05 ⁇ m or less.
- a method for measuring the particle diameter a method equivalent to the method disclosed in Japanese Patent No. 5432610 can be used.
- the D95 particle size of the polycrystalline diamond may be, for example, 1 ⁇ m or less, 0.1 ⁇ m or less, or 0.05 ⁇ m or less.
- the average particle diameter and D95 particle diameter of polycrystalline diamond can be measured by the following method.
- the average particle diameter of diamond particles in polycrystalline diamond can be obtained by performing image analysis based on a photographed image at a magnification of 100,000 to 500,000 with a scanning electron microscope. Since diamond is an insulator, a coating of a conductive thin film is required for SEM observation at a high magnification, and such a fine particle size cannot be observed by ordinary SEM observation.
- the SEM with a highly sensitive scintillator photomultiplier combination detector makes the acceleration voltage extremely low (0.7 to 1.5 KV) and increases the probe current to 15 to 16.5 pA, so that the magnification is 2 to The tissue can be observed at a magnification of 100,000 times. By performing image analysis based on this photographed image, the average particle diameter and the D95 particle diameter can be obtained. The detailed method is shown below.
- image analysis software for example, ScionImage manufactured by Scion Corporation
- the particle size distribution obtained above can be processed by data analysis software (for example, Origin manufactured by OriginLab, Mathad manufactured by Parametric Technology, etc.), and the average particle size and D95 particle size can be calculated.
- the coolant supply path 40 has the tapered portion 41 that expands in the direction from the rear end surface 32 toward the front end surface 21.
- the cutting blade body 50 includes the base portion 30 having the rear end surface 32 and the bottom surface 31 opposite to the rear end surface 32, and the cutting provided on the bottom surface 31.
- the blade part 20 may be included.
- the bottom surface 31 may be continuous with the tapered portion 41, may be inclined with respect to the tapered portion 41, and may be continuous with the outer peripheral surface 33.
- the material constituting the cutting blade body 50 may be polycrystalline diamond.
- the work material is an iron-based material, diamond and iron are highly reactive, so the cutting edge may be significantly worn. Therefore, in the end mill 1 in which the work material is an iron-based material and the cutting blade body 50 is made of diamond, the effect of suppressing wear is particularly high.
- the end mill 1 according to the second embodiment differs from the end mill 1 according to the first embodiment in the configuration in which the boundary portion 34 between the bottom surface 31 and the tapered portion 41 is continuous with the inner peripheral portion 27 of the cutting edge portion 20.
- Other configurations are the same as those of the end mill 1 according to the first embodiment.
- the configuration different from the end mill 1 according to the first embodiment will be mainly described.
- FIG. 6 is a schematic front view of the end mill 1 according to the second embodiment.
- FIG. 7 is a schematic end view taken along line VII-VII in FIG.
- FIG. 8 is a schematic end view taken along line VIII-VIII in FIG.
- the boundary portion 34 between the bottom surface 31 and the tapered portion 41 may be continuous with the inner peripheral portion 27 of the cutting edge portion 20 when viewed from a direction parallel to the rotation axis A.
- the distance from the inner peripheral portion 27 of the cutting edge portion 20 to the rotation axis A is the same as the distance from the boundary portion 34 between the bottom surface 31 and the taper portion 41 to the rotation axis A. There may be.
- FIG. 6 is a schematic front view of the end mill 1 according to the second embodiment.
- FIG. 7 is a schematic end view taken along line VII-VII in FIG.
- FIG. 8 is a schematic end view taken along line VIII-VIII in FIG.
- the boundary portion 34 between the bottom surface 31 and the tapered portion 41 may be continuous with the inner
- the inclination angle ⁇ 1 of the taper portion 41 with respect to the plane perpendicular to the rotation axis A is, for example, 0 ° or more and 80 ° or less.
- the length of the bottom surface 31 in the radial direction of the end mill 1 according to the second embodiment is longer than the length of the bottom surface 31 in the radial direction of the end mill 1 according to the first embodiment.
- the coolant can be effectively supplied to the inner peripheral cutting edge. Therefore, the cooling efficiency of the cutting blade is further increased, and the life of the end mill 1 can be further extended.
- the end mill 1 according to the third embodiment is different from the end mill 1 according to the first embodiment in the configuration in which the taper portion 41 is continuous with the outer peripheral surface 33 of the base portion 30, and the other configurations are the first embodiment. It is the same as the end mill 1 which concerns on a form.
- the configuration different from the end mill 1 according to the first embodiment will be mainly described.
- FIG. 9 is a schematic front view of the end mill 1 according to the third embodiment.
- FIG. 10 is a schematic end face view taken along the line XX of FIG.
- FIG. 11 is a schematic end view taken along line XI-XI in FIG.
- the tapered portion 41 may be continuous with the outer peripheral surface 33 of the base portion 30.
- the tapered portion 41 may be continuous with the inner peripheral portion 27 of the cutting edge portion 20.
- the tapered portion 41 may be continuous with each of the first side surface 22 and the second side surface 23.
- the inclination angle ⁇ 2 of the taper portion 41 with respect to the plane perpendicular to the rotation axis A is, for example, not less than 10 ° and not more than 80 °.
- the coolant can be effectively supplied to the outer peripheral cutting edge. Therefore, the cooling efficiency of the cutting blade is further increased, and the life of the end mill 1 can be further extended.
- the end mill 1 according to the fourth embodiment is configured such that the boundary portion 34 between the bottom surface 31 and the tapered portion 41 is located between the inner peripheral portion 27 of the cutting blade portion 20 and the outer peripheral surface 33. It differs from the end mill 1 which concerns on embodiment, and the other structure is the same as that of the end mill 1 which concerns on 1st Embodiment.
- the configuration different from the end mill 1 according to the first embodiment will be mainly described.
- FIG. 12 is a schematic front view of the end mill 1 according to the fourth embodiment.
- FIG. 13 is a schematic end view taken along line XIII-XIII in FIG. 14 is a schematic end view taken along the line XIV-XIV in FIG.
- the boundary portion 34 between the bottom surface 31 and the tapered portion 41 is between the inner peripheral portion 27 of the cutting blade portion 20 and the outer peripheral surface 33 when viewed from the direction parallel to the rotation axis A. May be located. From another viewpoint, when viewed from a direction parallel to the rotation axis A, the distance from the boundary portion 34 between the bottom surface 31 and the taper portion 41 to the rotation axis A is determined from the inner peripheral portion 27 of the cutting edge portion 20 to the rotation axis.
- the tapered portion 41 may be continuous with each of the first side surface 22 and the second side surface 23. As shown in FIG. 13, the tapered portion 41 may be continuous with the inner peripheral portion 27 of the cutting blade portion 20. As shown in FIG. 14, the tapered portion 41 is separated from the outer peripheral surface 33 of the base portion 30. As shown in FIG. 13, the inclination angle ⁇ 3 of the taper portion 41 with respect to the plane perpendicular to the rotation axis A is, for example, not less than 10 ° and not more than 80 °.
- the boundary portion 34 between the bottom surface 31 and the taper portion 41 as viewed from the direction parallel to the rotation axis A is the inner peripheral portion 27 and the outer peripheral surface 33 of the cutting blade portion 20. Is located between.
- coolant can be effectively supplied to both the inner peripheral side and outer peripheral side cutting blades. Therefore, the cooling efficiency of the cutting blade is further increased, and the life of the end mill 1 can be further extended.
- the end mill 1 according to the fifth embodiment is different from the end mill 1 according to the first embodiment in the configuration in which the bottom surface 31 includes the first bottom surface portion 35 and the second bottom surface portion 36, and the other configurations are as follows. This is the same as the end mill 1 according to the first embodiment.
- the configuration different from the end mill 1 according to the first embodiment will be mainly described.
- FIG. 15 is an enlarged perspective schematic view of the vicinity of the cutting blade body of the end mill 1 according to the fifth embodiment.
- FIG. 16 is a schematic front view of the end mill 1 according to the fifth embodiment.
- FIG. 17 is a schematic end face view taken along the line XVII-XVII in FIG.
- FIG. 18 is a schematic end face view taken along the line XVIII-XVIII in FIG.
- the bottom surface 31 may have a first bottom surface portion 35 and a second bottom surface portion 36.
- the first bottom surface portion 35 is continuous with the tapered portion 41.
- the second bottom surface portion 36 is continuous with the outer peripheral surface 33.
- the second bottom surface portion 36 is located on the outer peripheral side with respect to the first bottom surface portion 35.
- the second bottom surface portion 36 is located between the first bottom surface portion 35 and the outer peripheral surface 33 when viewed from a direction parallel to the rotation axis A.
- the second bottom surface portion 36 is located closer to the front end surface 21 than the first bottom surface portion 35.
- Each of the first bottom surface portion 35 and the second bottom surface portion 36 may be parallel to the tip surface 21.
- the distance from the tip surface 21 to the first bottom surface portion 35 is the first distance H1
- the distance from the tip surface 21 to the second bottom surface portion 36 is.
- the first distance H1 may be larger than the second distance H2.
- the first distance H1 is, for example, not less than 0.1 mm and not more than 3 mm.
- the second distance H2 is, for example, not less than 0.05 mm and not more than 3 mm.
- the first distance H1 is larger than the second distance H2.
- the base 30 may have a third side surface 37.
- the third side surface 37 is continuous with each of the first bottom surface portion 35 and the second bottom surface portion 36.
- the third side surface 37 extends, for example, along a direction parallel to the rotation axis A. As shown in FIG. 16, the third side surface 37 may be bent.
- the third side surface 37 may be continuous with each of the first side surface 22 and the second side surface 23.
- the first bottom surface portion 35 may be continuous with each of the first side surface 22 and the second side surface 23.
- the second bottom surface portion 36 may be continuous with each of the first side surface 22 and the second side surface 23.
- the first bottom surface portion 35 is continuous with the cutting edge portion 20 and may be separated from the outer peripheral surface 33.
- the first bottom surface portion 35 is continuous with the cutting edge portion 20 and is separated from the outer peripheral surface 33. Therefore, coolant can be effectively supplied near the cutting edge. Therefore, the cooling efficiency of the cutting blade is further increased, and the life of the end mill 1 can be further extended.
- the end mill 1 according to the sixth embodiment differs from the end mill 1 according to the fifth embodiment in the configuration in which the first bottom surface portion 35 is separated from the cutting edge portion 20 and is continuous with the outer peripheral surface 33, and other configurations. Is the same as the end mill 1 according to the fifth embodiment.
- the configuration different from the end mill 1 according to the fifth embodiment will be mainly described.
- FIG. 19 is a schematic front view of the end mill 1 according to the sixth embodiment.
- 20 is a schematic end face view taken along the line XX-XX in FIG.
- FIG. 21 is a schematic end view taken along line XXI-XXI in FIG.
- the first bottom surface portion 35 may be separated from the cutting blade portion 20 and may be continuous with the outer peripheral surface 33.
- each of the first bottom surface portion 35 and the second bottom surface portion 36 may be located between the inner peripheral portion 27 of the cutting blade portion 20 and the rotation axis A.
- the first bottom surface portion 35 is continuous with each of the taper portion 41 and the outer peripheral surface 33.
- the second bottom surface portion 36 continues to the outer peripheral surface 33 and is separated from the tapered portion 41.
- the third side surface 37 may be separated from the cutting edge portion 20.
- the third side surface 37 may have a portion parallel to the first side surface 22.
- the third side surface 37 may have a portion parallel to the second side surface 23.
- the third side surface 37 may have a portion located between the inner peripheral portion 27 of the cutting edge portion 20 and the tapered portion 41.
- the coolant can be effectively supplied to the vicinity of the outer peripheral cutting edge. Therefore, the cooling efficiency of the cutting blade is further increased, and the life of the end mill 1 can be further extended.
- the end mill 1 according to the seventh embodiment is different from the end mill 1 according to the fifth embodiment in the configuration in which the first bottom surface portion 35 is connected to each of the cutting edge portion 20 and the outer peripheral surface 33, and other configurations. Is the same as the end mill 1 according to the fifth embodiment.
- the configuration different from the end mill 1 according to the fifth embodiment will be mainly described.
- FIG. 22 is a schematic front view of the end mill 1 according to the seventh embodiment.
- FIG. 23 is a schematic end view taken along line XXIII-XXIII in FIG. 24 is a schematic end view taken along the line XXIV-XXIV in FIG.
- the first bottom surface portion 35 may be continuous with each of the cutting blade portion 20 and the outer peripheral surface 33.
- the second bottom surface portion 36 is continuous with the outer peripheral surface 33 and is separated from the cutting blade portion 20.
- the third side surface 37 may be separated from the cutting edge portion 20.
- the third side surface 37 may have a portion parallel to the first bottom blade 24.
- the third side surface 37 may have a portion parallel to the second bottom blade 25.
- the second bottom surface portion 36 is separated from the tapered portion 41.
- the first bottom surface portion 35 may be continuous with each of the cutting edge portion 20 and the outer peripheral surface 33.
- the coolant can be effectively supplied to the vicinity of the outer peripheral cutting edge. Therefore, the cooling efficiency of the cutting edge on the outer peripheral side is further increased, and the life of the end mill 1 can be further extended.
- the end mill 1 according to the eighth embodiment is different from the end mill 1 according to the first embodiment in the configuration in which the outer peripheral surface 33 is provided with the cutting edge side outer peripheral groove 38 continuous with the bottom surface 31, and other configurations. Is the same as the end mill 1 according to the first embodiment.
- the configuration different from the end mill 1 according to the first embodiment will be mainly described.
- FIG. 25 is an enlarged perspective schematic view of the vicinity of the cutting blade body of the end mill 1 according to the eighth embodiment.
- FIG. 26 is a schematic front view of the end mill 1 according to the eighth embodiment.
- FIG. 27 is a schematic end face view taken along line XXVII-XVII in FIG.
- FIG. 28 is a schematic end view taken along the line XXVIII-XXVIII in FIG.
- the outer peripheral surface 33 may be provided with a cutting edge side outer peripheral groove 38 continuous with the bottom surface 31.
- the outer peripheral surface 33 includes an arcuate surface 39 and a cutting edge side outer peripheral groove 38.
- the cutting edge side outer peripheral groove 38 is recessed toward the inner peripheral side.
- the arcuate surface 39 is convex on the outer peripheral side.
- the arcuate surface 39 is continuous with the cutting edge portion 20.
- the cutting edge side outer peripheral groove 38 is separated from the cutting edge portion 20.
- the cutting edge side outer peripheral groove 38 extends from the bottom surface 31 toward the shank 10.
- the cutting edge side outer peripheral groove 38 may reach the rear end surface 32 or may be separated from the rear end surface 32.
- the cutting edge side outer peripheral groove 38 may extend in a direction parallel to the rotation axis A, or may extend spirally around the rotation axis A.
- the shank 10 may be provided with a shank side outer peripheral groove 15.
- the cutting edge side outer peripheral groove 38 may be continuous with the shank side outer peripheral groove 15.
- the cutting edge side outer peripheral groove 38 may extend along the shank side outer peripheral groove 15.
- the cutting edge side outer peripheral groove 38 may be provided in parallel to the cylindrical portion 42 of the coolant supply path 40.
- the bottom surface 31 is continuous with each of the tapered portion 41 and the cutting edge side outer peripheral groove 38.
- the bottom surface 31 may be continuous with the arcuate surface 39 of the outer peripheral surface 33.
- the outer peripheral surface 33 is provided with the outer peripheral groove 38 continuous with the bottom surface 31. Therefore, chips and coolant can be effectively discharged. Therefore, the cooling efficiency of the cutting edge is further increased, and the life of the end mill 1 can be further extended.
- the end mill 1 according to the ninth embodiment is different from the end mill 1 according to the eighth embodiment in the configuration in which the bottom surface 31 includes the first bottom surface portion 35 and the second bottom surface portion 36, and the other configurations are as follows. This is the same as the end mill 1 according to the eighth embodiment.
- the configuration different from the end mill 1 according to the eighth embodiment will be mainly described.
- FIG. 29 is a schematic front view of the end mill 1 according to the ninth embodiment.
- FIG. 30 is a schematic end face view taken along line XXX-XXX in FIG.
- FIG. 31 is a schematic end face view taken along the line XXXI-XXXI in FIG.
- the bottom surface 31 may have a first bottom surface portion 35 and a second bottom surface portion 36.
- the first bottom surface portion 35 is continuous with each of the tapered portion 41 and the arc-shaped portion of the outer peripheral surface 33.
- the second bottom surface portion 36 is continuous with the cutting edge side outer peripheral groove 38 of the outer peripheral surface 33.
- the second bottom surface portion 36 may be surrounded by the first bottom surface portion 35 and the cutting edge side outer peripheral groove 38.
- the second bottom surface portion 36 is located closer to the front end surface 21 than the first bottom surface portion 35.
- Each of the first bottom surface portion 35 and the second bottom surface portion 36 may be parallel to the tip surface 21.
- the base 30 may have a third side surface 37.
- the third side surface 37 is continuous with each of the first bottom surface portion 35 and the second bottom surface portion 36.
- the third side surface 37 extends, for example, along a direction parallel to the rotation axis A.
- the first bottom surface portion 35 may be continuous with each of the cutting blade portion 20 and the outer peripheral surface 33.
- the second bottom surface portion 36 is continuous with the cutting edge side outer peripheral groove 38 of the outer peripheral surface 33 and may be separated from the cutting edge portion 20.
- the third side surface 37 may be separated from the cutting edge portion 20.
- the third side surface 37 may have a portion parallel to the first bottom blade 24.
- the third side surface 37 may have a portion parallel to the second bottom blade 25.
- the second bottom surface portion 36 is separated from the taper portion 41.
- the third side surface 37 may be continuous with the cutting edge side outer peripheral groove 38 of the outer peripheral surface 33.
- the first bottom surface portion 35 may be continuous with the cutting edge side outer peripheral groove 38 of the outer peripheral surface 33.
- chips and coolant can be effectively discharged.
- the outer peripheral cutting edge can be effectively cooled. Therefore, the cooling efficiency of the cutting edge is further increased, and the life of the end mill 1 can be further extended.
- the work material suitably processed by the end mill according to each of the above embodiments is, for example, a die made of ceramics, cemented carbide, or hardened steel.
- ceramics include zirconia and aluminum.
- the type of cemented carbide is, for example, AF1, G5 or G6.
- the kind of hardened steel is SKD11, for example.
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Abstract
Description
硬脆材を高回転で加工する場合、摩擦熱により切刃部が摩耗しやすい。特開2015-226953号公報(特許文献1)に記載のエンドミルにおいては、単にオイルホールが設けられているだけであるため、切刃部に対して効果的にクーラントを供給することができなかった。そのため、当該エンドミルにおいては、切刃部の摩耗を十分に抑制することができず、寿命が短いという課題があった。
本発明の一態様によれば、長寿命のエンドミルを提供することができる。
まず、本発明の実施形態の概要について説明する。
以下、図面に基づいて本開示の実施形態を説明する。なお、以下の図面において同一または相当する部分には同一の参照番号を付し、その説明は繰返さない。
まず、第1実施形態に係るエンドミル1の構成について説明する。図1は、第1実施形態に係るエンドミル1の斜視模式図である。図2は、第1実施形態に係るエンドミル1の切刃本体部50付近の拡大斜視模式図である。図3は、第1実施形態に係るエンドミル1の正面模式図である。
多結晶ダイヤモンド中のダイヤモンド粒子の平均粒径は、走査型電子顕微鏡により倍率10~50万倍で写真撮影像を元にして画像解析を実施することで得ることができる。ダイヤモンドは絶縁体であるため高倍率でのSEM観察には導電性薄膜のコーティングが必要であり、通常のSEM観察ではこのような微小粒径は観察できない。高感度のシンチレーターフォトマルチプライヤー組み合わせ型検出器搭載のSEMにより、加速電圧を極めて低く(0.7~1.5KV)し、プローブ電流量を15~16.5pAと大きくすることで、倍率2~10万倍での組織観察が可能となる。この写真撮影像を元にして画像解析を実施することで、平均粒径及びD95粒径を得ることができる。以下にその詳細方法を示す。
第1実施形態に係るエンドミル1によれば、クーラント供給路40は、後端面32から先端面21に向かう方向において拡がるテーパ部41を有している。これにより、テーパ部41がないエンドミルと比較して、クーラントが勢いよく刃先に対して吐出される。そのため、刃先の冷却効率が高くなり、エンドミル1の寿命を延ばすことができる。
次に、第2実施形態に係るエンドミル1の構成について説明する。第2実施形態に係るエンドミル1は、底面31とテーパ部41との境界部34は、切刃部20の内周部27に連なっている構成において、第1実施形態に係るエンドミル1と異なっており、その他の構成は、第1実施形態に係るエンドミル1と同様である。以下、第1実施形態に係るエンドミル1と異なる構成を中心に説明する。
次に、第3実施形態に係るエンドミル1の構成について説明する。第3実施形態に係るエンドミル1は、テーパ部41は、台部30の外周面33に連なっている構成において、第1実施形態に係るエンドミル1と異なっており、その他の構成は、第1実施形態に係るエンドミル1と同様である。以下、第1実施形態に係るエンドミル1と異なる構成を中心に説明する。
次に、第4実施形態に係るエンドミル1の構成について説明する。第4実施形態に係るエンドミル1は、底面31とテーパ部41との境界部34は、切刃部20の内周部27と、外周面33との間に位置している構成において、第1実施形態に係るエンドミル1と異なっており、その他の構成は、第1実施形態に係るエンドミル1と同様である。以下、第1実施形態に係るエンドミル1と異なる構成を中心に説明する。
次に、第5実施形態に係るエンドミル1の構成について説明する。第5実施形態に係るエンドミル1は、底面31が第1底面部35と第2底面部36とを有している構成において、第1実施形態に係るエンドミル1と異なっており、その他の構成は、第1実施形態に係るエンドミル1と同様である。以下、第1実施形態に係るエンドミル1と異なる構成を中心に説明する。
次に、第6実施形態に係るエンドミル1の構成について説明する。第6実施形態に係るエンドミル1は、第1底面部35が切刃部20から離間しかつ外周面33に連なっている構成において、第5実施形態に係るエンドミル1と異なっており、その他の構成は、第5実施形態に係るエンドミル1と同様である。以下、第5実施形態に係るエンドミル1と異なる構成を中心に説明する。
次に、第7実施形態に係るエンドミル1の構成について説明する。第7実施形態に係るエンドミル1は、第1底面部35は、切刃部20および外周面33の各々に連なっている構成において、第5実施形態に係るエンドミル1と異なっており、その他の構成は、第5実施形態に係るエンドミル1と同様である。以下、第5実施形態に係るエンドミル1と異なる構成を中心に説明する。
次に、第8実施形態に係るエンドミル1の構成について説明する。第8実施形態に係るエンドミル1は、外周面33に、底面31に連なる切刃側外周溝38が設けられていている構成において、第1実施形態に係るエンドミル1と異なっており、その他の構成は、第1実施形態に係るエンドミル1と同様である。以下、第1実施形態に係るエンドミル1と異なる構成を中心に説明する。
次に、第9実施形態に係るエンドミル1の構成について説明する。第9実施形態に係るエンドミル1は、底面31は、第1底面部35および第2底面部36を有している構成において、第8実施形態に係るエンドミル1と異なっており、その他の構成は、第8実施形態に係るエンドミル1と同様である。以下、第8実施形態に係るエンドミル1と異なる構成を中心に説明する。
Claims (14)
- シャンクと、
前記シャンク上に設けられ、かつクーラント供給路を有する切刃本体部とを備え、
前記切刃本体部は、前記シャンク側にある後端面と、前記後端面と反対側の先端面を含み、
前記クーラント供給路は、前記後端面から前記先端面に向かう方向において拡がるテーパ部を有している、エンドミル。 - 前記切刃本体部は、前記後端面に連なり、かつ回転軸の周りに設けられた外周面を含む、請求項1に記載のエンドミル。
- 前記切刃本体部は、前記後端面と前記後端面とは反対側の底面とを有する台部と、前記底面上に設けられた切刃部とを含み、
前記底面は、前記テーパ部に連なり、前記テーパ部に対して傾斜し、かつ前記外周面に連なる、請求項2に記載のエンドミル。 - 前記回転軸に平行な方向から見て、前記底面と前記テーパ部との境界部は、前記切刃部の内周部と、前記外周面との間に位置する、請求項3に記載のエンドミル。
- 前記底面は、前記テーパ部に連なる第1底面部と、前記外周面に連なる第2底面部とを有し、
前記回転軸に平行な方向において、前記先端面から前記第1底面部までの距離は、前記先端面から前記第2底面部までの距離よりも長い、請求項3に記載のエンドミル。 - 前記第1底面部は、前記切刃部に連なっており、かつ前記外周面から離間している、請求項5に記載のエンドミル。
- 前記第1底面部は、前記切刃部および前記外周面の各々に連なっている、請求項5に記載のエンドミル。
- 前記第1底面部は、前記切刃部から離間し、かつ前記外周面に連なっている、請求項5に記載のエンドミル。
- 前記外周面には、前記底面に連なる外周溝が設けられている、請求項3~請求項8のいずれか1項に記載のエンドミル。
- 前記回転軸に平行な方向における前記切刃部の高さを第1高さとし、
前記回転軸に平行な方向における前記テーパ部の深さを第1深さとした場合、
前記第1高さを前記第1深さで除した値は、0.1以上200以下である、請求項3~請求項9のいずれか1項に記載のエンドミル。 - 前記回転軸に垂直な方向における前記切刃本体部の直径を第1直径とし、
前記回転軸に垂直な方向における前記テーパ部の直径の最大値を第2直径とした場合、
前記第2直径を前記第1直径で除した値は、0.005以上3以下である、請求項2~請求項9のいずれか1項に記載のエンドミル。 - 前記クーラント供給路は、前記後端面側において前記テーパ部と連なり、かつ前記回転軸に沿って延在する筒状部を有し、
前記回転軸に垂直な方向における前記筒状部の直径を第3直径とした場合、
前記第3直径を前記第1直径で除した値は、0.005以上3以下であり、
前記第2直径は、前記第3直径よりも大きい、請求項11に記載のエンドミル。 - 前記切刃本体部を構成する材料は、多結晶ダイヤモンド、単結晶ダイヤモンドまたは立方晶窒化ホウ素のいずれかである、請求項1~請求項12のいずれか1項に記載のエンドミル。
- 前記切刃本体部を構成する材料は、多結晶ダイヤモンドであり、
前記多結晶ダイヤモンドの平均粒径は、1μm以下である、請求項13に記載のエンドミル。
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US16/981,825 US20210114124A1 (en) | 2018-03-22 | 2018-03-22 | End mill |
CN201880091632.XA CN111886102A (zh) | 2018-03-22 | 2018-03-22 | 立铣刀 |
PCT/JP2018/011398 WO2019180872A1 (ja) | 2018-03-22 | 2018-03-22 | エンドミル |
EP18911285.7A EP3769889A1 (en) | 2018-03-22 | 2018-03-22 | End mill |
JP2020507209A JPWO2019180872A1 (ja) | 2018-03-22 | 2018-03-22 | エンドミル |
TW107115889A TW201940268A (zh) | 2018-03-22 | 2018-05-10 | 端銑刀 |
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US3037264A (en) * | 1959-09-08 | 1962-06-05 | Carl W Mossberg | Coolant type milling cutter |
US7160062B2 (en) * | 2004-01-12 | 2007-01-09 | Toan Dat Tran | Milling cutter |
US20140356081A1 (en) * | 2013-05-30 | 2014-12-04 | Kennametal Inc. | End mill with high ramp angle capability |
DE102015106374A1 (de) * | 2015-04-24 | 2016-10-27 | Gühring KG | Drehwerkzeug mit sich verjüngendem Kühlmittelkanal sowie versetzt angeordneten Kühlmittelaustrittsleitungen und diesbezügliches Herstellverfahren |
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- 2018-03-22 WO PCT/JP2018/011398 patent/WO2019180872A1/ja active Application Filing
- 2018-03-22 EP EP18911285.7A patent/EP3769889A1/en not_active Withdrawn
- 2018-03-22 US US16/981,825 patent/US20210114124A1/en not_active Abandoned
- 2018-03-22 JP JP2020507209A patent/JPWO2019180872A1/ja not_active Withdrawn
- 2018-03-22 CN CN201880091632.XA patent/CN111886102A/zh active Pending
- 2018-05-10 TW TW107115889A patent/TW201940268A/zh unknown
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JPS5432610B2 (ja) | 1975-10-24 | 1979-10-16 | ||
JPS59176713U (ja) * | 1983-05-13 | 1984-11-26 | 富士精工株式会社 | ドリル兼用エンドミル |
JPH0724654A (ja) * | 1993-07-02 | 1995-01-27 | Hitachi Ltd | スクロールラップの加工方法 |
JPH11285912A (ja) * | 1998-02-05 | 1999-10-19 | Toshiba Corp | エンドミル及びこれを用いた切削加工法 |
JP2015226953A (ja) | 2014-05-31 | 2015-12-17 | 三菱日立ツール株式会社 | 小径エンドミル |
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JP2017196693A (ja) * | 2016-04-27 | 2017-11-02 | 住友電工ハードメタル株式会社 | 切削インサート |
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US20210114124A1 (en) | 2021-04-22 |
TW201940268A (zh) | 2019-10-16 |
CN111886102A (zh) | 2020-11-03 |
EP3769889A1 (en) | 2021-01-27 |
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