WO2024161564A1 - 切削工具 - Google Patents

切削工具 Download PDF

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Publication number
WO2024161564A1
WO2024161564A1 PCT/JP2023/003266 JP2023003266W WO2024161564A1 WO 2024161564 A1 WO2024161564 A1 WO 2024161564A1 JP 2023003266 W JP2023003266 W JP 2023003266W WO 2024161564 A1 WO2024161564 A1 WO 2024161564A1
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WO
WIPO (PCT)
Prior art keywords
nick
cutting edge
main cutting
cutting
main
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2023/003266
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
周平 三角
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Electric Hardmetal Corp
Original Assignee
Sumitomo Electric Hardmetal Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Electric Hardmetal Corp filed Critical Sumitomo Electric Hardmetal Corp
Priority to EP23789214.6A priority Critical patent/EP4431211A4/en
Priority to JP2023523263A priority patent/JP7298817B1/ja
Priority to CN202380012573.3A priority patent/CN118785987B/zh
Priority to PCT/JP2023/003266 priority patent/WO2024161564A1/ja
Priority to US18/272,099 priority patent/US12350745B2/en
Publication of WO2024161564A1 publication Critical patent/WO2024161564A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/006—Details of the milling cutter body
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/04—Angles
    • B23C2210/0485—Helix angles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/08—Side or top views of the cutting edge
    • B23C2210/086—Discontinuous or interrupted cutting edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/08—Side or top views of the cutting edge
    • B23C2210/088—Cutting edges with a wave form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/48—Chip breakers
    • B23C2210/486—Chip breaking grooves or depressions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2226/00—Materials of tools or workpieces not comprising a metal
    • B23C2226/27—Composites, e.g. fibre reinforced composites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2250/00—Compensating adverse effects during milling
    • B23C2250/16—Damping vibrations

Definitions

  • This disclosure relates to cutting tools.
  • cutting tools have been known that include a rotatable body, a main cutting edge that has a twist angle on the outer periphery of the body, and nick-shaped cutting edges that are arranged at an opposite twist angle to the twist angle of the main cutting edge (see, for example, JP 2011-20248 A).
  • a cutting tool includes a shank and at least two or more main cutting edge portions.
  • the shank extends along a central axis.
  • the shank has an outer peripheral surface.
  • the outer peripheral surface surrounds the central axis.
  • the two or more main cutting edge portions are arranged in a spiral on the outer peripheral surface.
  • the main cutting edge portion has a main cutting edge.
  • the main cutting edge has a twist angle. In a direction along the central axis, in a portion from the center of the region within ⁇ 30% of the cutting edge length of the region, the main cutting edge portion has at least one first nick portion and one second nick portion.
  • the main cutting edge portion is formed in the region.
  • the first nick portion and the second nick portion have a twist angle in the opposite direction to the twist angle.
  • the relationship between the first nick portion and the second nick portion satisfies at least one of a first condition and a second condition.
  • the first condition is when the width of the first nick portion is different from the width of the second nick portion.
  • the second condition is when the depth of the first nick portion is different from the depth of the second nick portion.
  • FIG. 1 is a plan view of a cutting tool according to a first embodiment of the present invention.
  • FIG. 2 is a partially enlarged plan view of region II in FIG.
  • FIG. 3 is a cross-sectional view taken along line III-III in FIG.
  • FIG. 4 is a partially enlarged schematic cross-sectional view of region IV in FIG.
  • FIG. 5 is a partially enlarged plan view showing a first modification of the cutting tool according to the first embodiment.
  • FIG. 6 is a partially enlarged schematic cross-sectional view of region VI in FIG.
  • FIG. 7 is a partially enlarged plan view showing a second modification of the cutting tool according to the first embodiment.
  • FIG. 8 is a partially enlarged schematic cross-sectional view of region VIII in FIG.
  • the number of grooves on the nick-shaped cutting edge is different from the number of grooves on the main cutting edge, which suppresses vibration in the workpiece and results in a workpiece with a good cutting surface.
  • This disclosure has been made to solve the problems described above. More specifically, it provides a cutting tool that can suppress vibrations of the workpiece during cutting.
  • the cutting tool disclosed herein can suppress vibrations of the workpiece during cutting.
  • a cutting tool includes a shank and at least two or more major cutting edge portions.
  • the shank extends along a central axis.
  • the shank has an outer peripheral surface.
  • the outer peripheral surface surrounds the central axis.
  • the two or more major cutting edge portions are arranged in a spiral on the outer peripheral surface.
  • the major cutting edge portion has a major cutting edge.
  • the major cutting edge has a twist angle. In a direction along the central axis, in a portion from the center of the region within ⁇ 30% of the cutting edge length of the region, the major cutting edge portion has at least one or more first nick portions and second nick portions.
  • the major cutting edge portion is formed in the region.
  • the first nick portion and the second nick portion have a twist angle in a direction opposite to the twist angle.
  • the relationship between the first nick portion and the second nick portion satisfies at least one of a first condition and a second condition.
  • the first condition is when the width of the first nick portion is different from the width of the second nick portion.
  • the second condition is when the depth of the first nick portion is different from the depth of the second nick portion.
  • the first condition may be that the width of the first nick portion is at least two times and at most ten times the width of the second nick portion.
  • the second condition may be that the depth of the first nick portion is at least two times and at most fifteen times the depth of the second nick portion.
  • the cross-sectional area of the first nick portion may be 5 to 120 times the cross-sectional area of the second nick portion.
  • the number of main cutting edge portions may be greater than the number of first nick portions each of the main cutting edge portions contains.
  • the twist angle at the main cutting edge may be 30° or more and 50° or less.
  • the twist angle in the opposite direction to the twist angle at each of the first and second nick portions may be 30° or more and 50° or less.
  • the main cutting edge portion may include at least two first nick portions.
  • the second nick portion may be located at an intermediate position between two first nick portions.
  • the cutting tools (1) to (6) above may be coated with diamond.
  • FIG. 1 is a plan view of a cutting tool 1 according to this embodiment.
  • FIG. 2 is a partially enlarged plan view of region II in FIG. 1.
  • FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2.
  • FIG. 4 is a partially enlarged schematic cross-sectional view of region IV in FIG. 2.
  • a cutting tool 1 is a tool for cutting FRP (Fiber Reinforced Plastic) materials such as carbon fiber reinforced plastics, and mainly includes a shaft portion 30 and at least two or more main cutting edges 11. In this embodiment, the number of main cutting edges 11 is five.
  • the shape of the shaft portion 30 is substantially cylindrical.
  • the shaft portion 30 extends along the central axis R.
  • the shaft portion 30 has a tip surface 2a, a rear end surface 2b, and an outer circumferential surface 2.
  • the rear end surface 2b is located on the opposite side to the tip surface 2a.
  • the outer circumferential surface 2 is a surface that connects the tip surface 2a and the rear end surface 2b. In other words, the outer circumferential surface 2 surrounds the central axis R.
  • the shaft portion 30 can rotate about the central axis R.
  • the shaft portion 30 further has a shank portion 20 and a cutting portion 10.
  • the cutting portion 10 has a tip surface 2a.
  • the shank portion 20 has a rear end surface 2b. That is, the cutting portion 10 is connected to the shank portion 20.
  • the cutting length W of the cutting portion 10 is the distance in the first direction X from the tip surface 2a to the end of the main cutting edge portion 11 on the rear end surface 2b side, where the direction in which the central axis R extends is the first direction X.
  • the tip surface 2a and the rear end surface 2b are surfaces perpendicular to the central axis R. That is, the tip surface 2a and the rear end surface 2b are surfaces perpendicular to the outer peripheral surface 2.
  • the cutting diameter is, for example, 10 mm.
  • the cutting diameter may be, for example, 2 mm or more and 20 mm or less, or 3 mm.
  • the main cutting edge portions 11 are formed on the outer peripheral surface 2.
  • the main cutting edge portions 11 are arranged in a spiral on the outer peripheral surface 2.
  • the main cutting edge portion 11 has a main rake face 11b, a main clearance face 11c, and a main cutting edge 11a.
  • the main cutting edge 11a is arranged on the outer peripheral surface 2.
  • the main rake face 11b is formed to extend from the main cutting edge 11a in a direction from the main cutting edge 11a toward the central axis R.
  • the main clearance face 11c is located on the opposite side of the main cutting edge 11a to the main rake face 11b.
  • the main cutting edge 11b is connected to the main clearance face 11c via the main cutting edge 11a.
  • the main cutting edge 11a has a main helix angle ⁇ 1.
  • the main helix angle ⁇ 1 is the narrower angle between the central axis R and the tangent to the main cutting edge 11a at the point where the central axis R and the main cutting edge 11a intersect.
  • the first nick portion 13 has a first nick rake surface 13b, a first nick facing surface 13c, a first nick cutting edge 13a, and a first nick connection portion 13e.
  • the first nick rake surface 13b and the first nick facing surface 13c are connected to the main rake surface 11b and the main clearance surface 11c, respectively.
  • the first nick rake surface 13b is connected to the main clearance surface 11c via the first nick cutting edge 13a.
  • the first nick facing surface 13c is connected to the main clearance surface 11c via the first nick connection portion 13e.
  • the main cutting edge 11a and the first nick cutting edge 13a intersect at a first intersection point p1.
  • the first nick connection portion 13e and the main cutting edge 11a intersect at a third intersection point p3.
  • the first intersection point p1 is located on the outer peripheral surface 2.
  • the third intersection point p3 is located on the outer peripheral surface 2.
  • Area IV shown in FIG. 2 is a cross-sectional area of the main cutting edge portion 11 cut in a direction perpendicular to the central axis R from a line segment along the main cutting edge 11a of the main cutting edge portion 11.
  • area IV is a cross-sectional area of the main cutting edge portion 11 including the first intersection point p1, the second intersection point p2, the third intersection point p3, and the fourth intersection point p4.
  • FIG. 4 is a partially enlarged cross-sectional schematic diagram of the cross-sectional area of the main cutting edge portion 11 in area IV.
  • the cross-sectional schematic diagram shown in FIG. 4 shows the main cutting edge portion 11 including the first nick portion 13 and the second nick portion 14 described later.
  • the actual main cutting edge 11a is arranged in a spiral shape, so it is curved, but in FIG. 4, the main cutting edge 11a is shown as a straight line for the sake of explanation.
  • the up and down directions in FIG. 4 indicate the radial direction centered on the central axis R of the cutting tool 1.
  • the first nick rake surface 13b and the first nick facing surface 13c are formed to extend from the main cutting edge 11a in the direction of the central axis R.
  • the first nick rake surface 13b and the first nick facing surface 13c are connected via the first nick bottom 13d.
  • the first nick bottom 13d is the part of the first nick portion 13 that is closest to the central axis R.
  • the first nick bottom 13d is the point that is farthest from the outer peripheral surface 2 in the direction of the central axis R.
  • the distance from the outer peripheral surface 2 to the first nick bottom 13d is the depth h1. As shown in FIG.
  • the width w1 of the first nick portion 13 is the length of the line segment connecting the first intersection point p1 and the third intersection point p3 of the first nick portion 13.
  • the cross-sectional area A1 of the first nick portion 13 is the area of the region surrounded by the straight line connecting the first intersection point p1 and the third intersection point p3 shown in FIG. 4, the first nick rake face 13b, and the first nick facing face 13c.
  • the width w1 of the first nick portion 13 may be, for example, 0.35 mm or more and 4.2 mm or less.
  • the depth h1 of the first nick portion 13 may be, for example, 0.1 mm or more and 3.4 mm or less.
  • the first nicked cutting edge 13a has a reverse twist angle ⁇ 2.
  • the reverse twist angle ⁇ 2 is the narrower angle among the angles between the central axis R and the tangent to the first nicked cutting edge 13a at the point where the central axis R and the first nicked cutting edge 13a intersect.
  • the reverse twist angle ⁇ 2 of the first nicked cutting edge 13a is a twist angle in the opposite direction to the main twist angle ⁇ 1 of the main cutting edge 11a when viewed from the central axis R. In this way, the main cutting edge portion 11 has a first nicked portion 13. By having such a first nicked portion 13, the generation of vibration is suppressed and cutting resistance is reduced when cutting a workpiece.
  • the cutting tool 1 according to the present embodiment 1 is characterized in that, as shown in Figs. 1 to 4, in the cutting tool 1, the main cutting edge portion 11 has a second nick portion 14.
  • the second nick portion 14 is arranged so as to be sandwiched between the two first nick portions 13 in the first direction X.
  • the second nick portion 14 may be arranged, for example, at a midpoint between the two first nick portions 13.
  • the second nick portion 14 may be arranged, for example, at a position other than the midpoint between the two first nick portions 13.
  • a plurality of second nick portions 14 (for example, two) may be provided between the two first nick portions 13.
  • the second nick portion 14 has a different shape from the first nick portion 13.
  • the relationship between the first nick portion 13 and the second nick portion 14 satisfies at least one of the first and second conditions.
  • the first condition is when the width w1 of the first nick portion 13 is different from the width w2 of the second nick portion 14.
  • the second condition is when the depth h1 of the first nick portion 13 is different from the depth h2 of the second nick portion 14.
  • the second nick portion 14 is disposed within the first region A.
  • the first region A is a portion within ⁇ 30% of the blade length W of the region B from the center C of the region B in which the main cutting edge portion 11 is formed in the first direction X.
  • the region B in which the main cutting edge portion 11 is formed is a region from the tip surface 2a of the cutting portion 10 to a position away from the blade length W in the first direction X.
  • the center C is a position away from the tip surface 2a in the first direction X by half the length of the blade length W.
  • the first region A is a region within ⁇ 30% of the blade length W of the cutting portion 10 from the center C in the first direction X with respect to the center C. That is, the second nick portion 14 is disposed on the outer peripheral surface 2 of the cutting portion 10 in the first region A.
  • the second nick portion 14 may be formed in a region B in which the main cutting edge portion 11 is formed, other than the first region A. However, due to manufacturing issues, it may be more difficult to form the second nick portion 14 closer to the tip surface 2a and the shank portion 20.
  • the second nick portion 14 has a second nick rake surface 14b, a second nick facing surface 14c, a second nick cutting edge 14a, and a second nick connection portion 14e.
  • the second nick rake surface 14b and the second nick facing surface 14c are connected to the main rake surface 11b and the main clearance surface 11c, respectively.
  • the second nick rake surface 14b is connected to the main clearance surface 11c via the second nick cutting edge 14a.
  • the second nick facing surface 14c is connected to the main clearance surface 11c via the second nick connection portion 14e.
  • the main cutting edge 11a and the second nick cutting edge 14a intersect at a second intersection point p2.
  • the second nick connection portion 14e and the main cutting edge 11a intersect at a fourth intersection point p4.
  • the second intersection point p2 is located on the outer peripheral surface 2.
  • the fourth intersection point p4 is located on the outer peripheral surface 2.
  • the second nick rake surface 14b and the second nick facing surface 14c are formed to extend from the main cutting edge 11a in the direction of the central axis R.
  • the second nick rake surface 14b and the second nick facing surface 14c are connected via the second nick bottom 14d.
  • the second nick bottom 14d is the part of the second nick portion 14 that is closest to the central axis R.
  • the second nick bottom 14d is the point furthest from the outer peripheral surface 2 in the direction of the central axis R.
  • the distance from the outer peripheral surface 2 to the second nick bottom 14d is the depth h2. As shown in FIG.
  • the width w2 of the second nick portion 14 is the length of the line segment connecting the second intersection point p2 and the fourth intersection point p4 of the second nick portion 14.
  • the cross-sectional area A2 of the second nick portion 14 is the area of the region surrounded by the straight line connecting the second intersection point p2 and the fourth intersection point p4 shown in FIG. 4, the second nick rake face 14b, and the second nick facing face 14c.
  • the width w1 of the first nick portion 13, the depth h1 of the first nick portion 13, the width w2 of the second nick portion 14, and the depth h2 of the second nick portion 14 are measured from the profile shapes of the first nick portion 13 and the second nick portion 14.
  • the profile shapes of the first nick portion 13 and the second nick portion 14 may be measured using a non-contact three-dimensional measuring machine manufactured by Bruker Alicona.
  • the cross-sectional area A1 of the first nick portion 13 and the cross-sectional area A2 of the second nick portion 14 can be calculated from the profile shapes of the first nick portion 13 and the second nick portion 14 described above.
  • the second nicked cutting edge 14a has a reverse twist angle ⁇ 3.
  • the reverse twist angle ⁇ 3 is the narrower angle between the central axis R and the tangent to the second nicked cutting edge 14a at the point where the central axis R and the second nicked cutting edge 14a intersect.
  • the reverse twist angle ⁇ 3 of the second nicked cutting edge 14a is a twist angle in the opposite direction to the main twist angle ⁇ 1 of the main cutting edge 11a when viewed from the central axis R. In this way, the main cutting edge portion 11 has a second nicked portion 14.
  • the number of first nick portions 13 in each of the main cutting edges 11 may be, for example, one or more.
  • the number of first nick portions 13 may be two or three.
  • the number of first nick portions 13 included in each of the main cutting edges 11 is preferably smaller than the number of main cutting edges 11 included in the cutting tool 1. From a different perspective, the number of main cutting edges 11 is preferably greater than the number of first nick portions 13 included in each of the main cutting edges 11.
  • the first nick portions 13 can be easily arranged so as not to overlap in the rotation direction of the cutting tool 1, so that when the workpiece is cut, one rotation of the cutting tool 1 can prevent the occurrence of an uncut area on the cutting surface of the workpiece.
  • the number of second nick portions 14 that each of the main cutting edge portions 11 has may be, for example, one or more.
  • the number of second nick portions 14 that each of the main cutting edge portions 11 has may be two or three. If each of the main cutting edge portions 11 has a large number of first nick portions 13 and second nick portions 14, the generation of vibrations is further suppressed and cutting resistance is further reduced when the cutting tool 1 cuts a workpiece.
  • the cutting tool 1 may be coated with diamond. In this way, the strength and tool life of the cutting tool 1 can be improved.
  • a cutting tool 1 comprises a shank 30 and at least two or more main cutting edge portions 11.
  • the shank 30 extends along a central axis R.
  • the shank 30 has an outer peripheral surface 2.
  • the outer peripheral surface 2 surrounds the central axis R.
  • the two or more main cutting edge portions 11 are arranged in a spiral on the outer peripheral surface 2.
  • the main cutting edge portion 11 has a main cutting edge 11a.
  • the main cutting edge 11a has a twist angle ⁇ 1. In a direction along the central axis R, in a portion from the center C of region B within ⁇ 30% of the blade length W of region B, the main cutting edge portion 11 has at least one first nick portion 13 and one second nick portion 14.
  • the main cutting edge portion 11 is formed in region B.
  • the first nick portion 13 and the second nick portion 14 have twist angles ⁇ 2, ⁇ 3 in the opposite direction to the twist angle ⁇ 1.
  • the relationship between the first nick portion 13 and the second nick portion 14 satisfies at least one of the first and second conditions.
  • the first condition is when the width w1 of the first nick portion 13 is different from the width w2 of the second nick portion 14.
  • the second condition is when the depth h1 of the first nick portion 13 is different from the depth h2 of the second nick portion 14.
  • the first condition may be that the width w1 of the first nick portion 13 is at least two times and at most ten times the width w2 of the second nick portion 14.
  • the second condition may be that the depth h1 of the first nick portion 13 is at least two times and at most fifteen times the depth h2 of the second nick portion 14.
  • the cross-sectional area A1 of the first nick portion 13 may be 5 to 120 times the cross-sectional area A2 of the second nick portion 14. In this way, vibrations generated during cutting can be significantly suppressed, and the discharge of chips generated during cutting can be sufficiently ensured. As a result, chips do not become clogged in the second nick portion 14 during cutting, and the finish quality of the machined surface of the workpiece is greatly improved.
  • the number of main cutting edge portions 11 may be greater than the number of first nick portions 13 that each of the main cutting edge portions 11 includes. In this way, the occurrence of cutting residue in the workpiece can be suppressed when the cutting tool 1 rotates once during cutting.
  • the twist angle ⁇ 1 at the main cutting edge 11a may be 30° or more and 50° or less.
  • the twist angles ⁇ 2, ⁇ 3 in the opposite direction to the twist angle ⁇ 1 at the first nick portion 13 and the second nick portion 14, respectively, may be 30° or more and 50° or less. In this way, the generation of vibration during cutting is suppressed as described below, cutting resistance is reduced, and the finish quality of the machined surface is improved.
  • the main cutting edge portion 11 may include at least two or more first nick portions 13.
  • the second nick portion 14 may be located at an intermediate position between the two first nick portions 13. In this way, the reduction in strength of the main cutting edge portion 11 due to the provision of the second nick portion 14 can be minimized.
  • the cutting tool 1 may be coated with diamond. This can improve the strength and tool life of the cutting tool 1.
  • test 1 the finish of the cutting surface of the workpiece, the chip discharge property, and the tool life of the cutting tool 1 were evaluated depending on whether or not the second nick portion 14 was present.
  • the test subjects were three types of cutting tools 1, Sample 1 to Sample 3.
  • the cutting diameter of the cutting tools 1 relating to Sample 1 to Sample 3 was 10 mm, and the number of main cutting edge portions 11 was 5.
  • the number of first nick portions 13 in one main cutting edge portion 11 was 6.
  • Sample 1 and Sample 2 the main cutting edge portion 11 has the first nick portion 13 but does not have the second nick portion 14.
  • Sample 3 the main cutting edge portion 11 has the first nick portion 13 and the second nick portion 14.
  • the number of second nick portions 14 in the first region A in one main cutting edge portion 11 in Sample 3 was 6.
  • the width w1 of the first nick portion 13 of the cutting tool 1 relating to Sample 2 is smaller than the width w1 of the first nick portion 13 of the cutting tool 1 relating to Sample 1 and Sample 3.
  • the width W1 of the first nick portion 13 in Sample 1 and Sample 3 is 2.0 mm, and the depth h1 is 1.5 mm.
  • the width W1 of the first nick portion 13 in Sample 2 is 1.0 mm, and the depth h1 is 0.6 mm.
  • the width W2 of the second nick portion 14 in Sample 3 is 0.5 mm, and the depth h2 is 0.3 mm. In this way, the effects of the width w1 of the first nick portion 13 and the presence or absence of the second nick portion 14 were investigated.
  • the workpiece is CFRP.
  • the thickness of the CFRP is 6 mm.
  • the cutting conditions are that the rotation speed of the cutting tool 1 is 4000 rpm and the processing speed is 400 mm/min.
  • Table 1 lists the conditions, namely the width w1 of the first nick portion 13 and the presence or absence of the second nick portion 14, and the test results, namely the finish of the cutting surface of the workpiece, the chip dischargeability, and the tool life of the cutting tool 1.
  • A, B, and C indicate the evaluation of each item.
  • B indicates that it is better than C.
  • A indicates that it is better than B.
  • A indicates that it is the best evaluation result among A, B, and C.
  • the chip dischargeability is good, it indicates that clogging due to chips is suppressed.
  • the test results for cutting tool 1 for Sample 1 and Sample 2 show that by reducing the width w1 of the first nick portion, the cross-sectional area A1 of the first nick portion 13 is reduced, and the chip removal performance is deteriorated. The chips get stuck in the first nick portion 13, which increases the cutting resistance of the cutting tool 1, resulting in a shortened tool life of the cutting tool 1.
  • test 2 the finish of the cutting surface of the workpiece, the chip discharge property, and the tool life of the cutting tool 1 according to the shape of the second nick portion 14 were evaluated.
  • the test subjects were 10 types of cutting tools 1 from sample 4 to sample 13.
  • the main cutting edge portion 11 has the first nick portion 13 but does not have the second nick portion 14.
  • the main cutting edge portion 11 has the first nick portion 13 and the second nick portion 14.
  • the effects of changing the width ratio (w1/w2), depth ratio (h1/h2), and cross-sectional area ratio (A1/A2) were investigated.
  • the width ratio is the value obtained by dividing the width w1 of the first nick portion 13 by the width w2 of the second nick portion 14.
  • the depth ratio is the value obtained by dividing the depth h1 of the first nick portion 13 by the depth h2 of the second nick portion 14.
  • the cross-sectional area ratio is the cross-sectional area A1 of the first nick portion 13 divided by the cross-sectional area A2 of the second nick portion 14.
  • the cutting diameter of the cutting tool 1 of Sample 4 to Sample 10 and the cutting tool 1 of Sample 13 is 10 mm.
  • the cutting diameter of the cutting tool 1 of Sample 11 and Sample 12 is 3 mm.
  • the main helix angle ⁇ 1 of the main cutting edge 11a is 45°.
  • the main helix angle ⁇ 1 of the main cutting edge 11a is a value between 20° and 50°, which is different from each other.
  • the cutting tool 1 is diamond coated.
  • the cutting tool 1 of Sample 13 the cutting tool 1 is not diamond coated.
  • the number of the main cutting edge portions 11 is 5, and the number of the first nick portions 13 and the number of the second nick portions 14 in one main cutting edge portion 11 is 6, respectively.
  • the number of main cutting edge portions 11 is 3, and the number of first nicks 13 and the number of second nicks 14 in one main cutting edge portion 11 are each 4.
  • the workpiece is CFRP.
  • the thickness of the CFRP is 6 mm.
  • the cutting conditions are that the rotation speed of the cutting tool 1 is 8000 rpm and the processing speed is 1600 mm/min.
  • test results are shown in Table 2.
  • Table 1 from the left, the conditions are width ratio, depth ratio, cross-sectional area ratio, main helix angle ⁇ 1, and the presence or absence of diamond coating, and the test results are the finish of the cut surface of the workpiece, chip removal performance, and tool life of the cutting tool 1.
  • A, B, C, and D indicate the evaluation for each item.
  • C indicates that it is better than D.
  • B indicates that it is better than C.
  • A indicates that it is better than B.
  • A indicates that it is better than B.
  • A indicates that it is the best evaluation result among A, B, and C.
  • the finish of the cutting surface of the cutting tools 1 relating to samples 5 to 13 is improved compared to that of the cutting tool 1 relating to sample 4.
  • the chip dischargeability of the cutting tools 1 relating to samples 5 to 13 is improved compared to that of the cutting tool 1 relating to sample 4.
  • the results of test 2 were the same as those of test 1.
  • the test results of the cutting tools 1 relating to samples 5 and 6 show that when the width ratio and depth ratio increase, the cross-sectional area ratio increases, and therefore not only the finish of the cutting surface but also the chip dischargeability are significantly improved.
  • the width ratio of the cutting tools 1 for samples 7 and 9 is 11 times. As a result, the length of the main cutting edge 11a is insufficient, and the finish of the cut surface deteriorates. Therefore, a width ratio of 10 times or less is preferable.
  • the cutting tool 1 for sample 8 has a weak twist design in which the main helix angle ⁇ 1 of the main cutting edge is 30°, but the finish of the cut surface and the discharge of chips are improved.
  • the cutting tool 1 of sample 10 has a depth ratio of 17 times. As a result, the rigidity of the cutting tool 1 is low. Therefore, it is preferable that the depth ratio is 16 times or less. From the above results, it is preferable that the width w1 of the first nick portion 13 is 2 times or more and 10 times or less than the width w2 of the second nick portion 14. It is preferable that the depth h1 of the first nick portion 13 is 2 times or more and 15 times or less than the depth h2 of the second nick portion 14. From another perspective, it is preferable that the cross-sectional area A1 of the first nick portion 13 is 5 times or more and 120 times or less than the cross-sectional area A2 of the second nick portion 14.
  • test results for cutting tool 1 relating to sample 11 and sample 12, which have a cutting diameter of 3 mm, show that providing a second nick portion 14 on the main cutting edge portion 11 improves the finish of the cutting surface and the ability to remove chips, similar to cutting tool 1 with a cutting diameter of 10 mm.
  • providing the second nick portion 14 on the main cutting edge portion 11 may reduce the tool life of the cutting tool 1.
  • the test results of the cutting tools 1 of Samples 6 and 13 show that the tool life of the cutting tool 1 is significantly improved by coating it with diamond.
  • FIG. 5 is a partially enlarged plan view showing modified example 1 of cutting tool 1 according to embodiment 1.
  • FIG. 5 corresponds to FIG. 2.
  • FIG. 6 is a partially enlarged schematic cross-sectional view of region VI in FIG. 5.
  • FIG. 6 corresponds to FIG. 4.
  • the cutting tool 1 shown in Figures 5 and 6 basically has the same configuration as the cutting tool 1 shown in Figures 1 to 4, but differs in that two second nick portions 14 are formed between two first nick portions 13. Specifically, as shown in Figure 6, two second nick portions 14 are formed on the main cutting edge portion 11 so as to be sandwiched between two first nick portions 13.
  • the number of second nick portions 14 is not limited to two.
  • three second nick portions 14 may be formed on the main cutting edge portion 11 so as to be sandwiched between two first nick portions 13. In this way, by forming multiple second nick portions 14 between two first nick portions 13, it is possible to further suppress vibrations generated during cutting. As a result, the finish quality of the machined surface of the workpiece cut by the cutting tool 1 is further improved.
  • FIG. 7 is a partially enlarged plan view showing modified example 2 of cutting tool 1 according to embodiment 1.
  • FIG. 7 corresponds to FIG. 2.
  • FIG. 8 is a partially enlarged schematic cross-sectional view of region VIII in FIG. 7.
  • FIG. 8 corresponds to FIG. 4.
  • the cutting tool 1 shown in Figs. 7 and 8 has a similar configuration to the cutting tool 1 shown in Figs. 1 to 4, but differs in that the width w2 of the second nick portion 14 is greater than the width w1 of the first nick portion 13.
  • the depth h1 of the first nick portion 13 only needs to be greater than the depth h2 of the second nick portion 14.
  • the width w1 of the first nick portion 13 only needs to be greater than the width w2 of the second nick portion 14.
  • the relationship between the first nick portion 13 and the second nick portion 14 satisfies at least one of the first and second conditions.
  • the first condition is that the width w1 of the first nick portion 13 is at least 2 times and at most 10 times the width w2 of the second nick portion 14.
  • the second condition is that the depth h1 of the first nick portion 13 is at least 2 times and at most 15 times the depth h2 of the second nick portion 14.
  • the cutting tool 1 can suppress vibrations that occur during cutting while ensuring the discharge of cutting chips.
  • 1 cutting tool 2 outer peripheral surface, 2a tip surface, 2b rear end surface, 10 cutting portion, 11 main cutting edge portion, 11a main cutting edge, 11b main rake surface, 11c main clearance surface, 13 first nick portion, 13a first nick cutting edge, 13b first nick rake surface, 13c first nick opposing surface, 13d first nick bottom portion, 13e first nick connection portion, 14 second nick portion, 14a second nick Cutting edge, 14b second nick rake face, 14c second nick facing face, 14d second nick bottom, 14e second nick connection, 20 shank portion, 30 shaft portion, A first region, A1, A2 cross-sectional area, B region, C center, R central axis, W cutting edge length, X first direction, h1, h2 depth, w1, w2 width, p1 first intersection, p2 second intersection, p3 third intersection, p4 fourth intersection.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)
PCT/JP2023/003266 2023-02-01 2023-02-01 切削工具 Ceased WO2024161564A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP23789214.6A EP4431211A4 (en) 2023-02-01 Cutting tool
JP2023523263A JP7298817B1 (ja) 2023-02-01 2023-02-01 切削工具
CN202380012573.3A CN118785987B (zh) 2023-02-01 2023-02-01 切削工具
PCT/JP2023/003266 WO2024161564A1 (ja) 2023-02-01 2023-02-01 切削工具
US18/272,099 US12350745B2 (en) 2023-02-01 2023-02-01 Cutting tool

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JPWO2024161564A1 (https=) 2024-08-08
CN118785987B (zh) 2025-10-31
US12350745B2 (en) 2025-07-08
CN118785987A (zh) 2024-10-15
US20240253136A1 (en) 2024-08-01
JP7298817B1 (ja) 2023-06-27

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