WO2024105785A1 - Plaquette de coupe et outil de coupe de type à bord de lame remplaçable - Google Patents

Plaquette de coupe et outil de coupe de type à bord de lame remplaçable Download PDF

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Publication number
WO2024105785A1
WO2024105785A1 PCT/JP2022/042417 JP2022042417W WO2024105785A1 WO 2024105785 A1 WO2024105785 A1 WO 2024105785A1 JP 2022042417 W JP2022042417 W JP 2022042417W WO 2024105785 A1 WO2024105785 A1 WO 2024105785A1
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WO
WIPO (PCT)
Prior art keywords
cutting insert
cutting
sides
center
long
Prior art date
Application number
PCT/JP2022/042417
Other languages
English (en)
Japanese (ja)
Inventor
翔太 相澤
達也 津曲
Original Assignee
ダイジ▲ェ▼ット工業株式会社
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 ダイジ▲ェ▼ット工業株式会社 filed Critical ダイジ▲ェ▼ット工業株式会社
Priority to PCT/JP2022/042417 priority Critical patent/WO2024105785A1/fr
Priority to JP2022576212A priority patent/JPWO2024105785A1/ja
Publication of WO2024105785A1 publication Critical patent/WO2024105785A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/16—Milling-cutters characterised by physical features other than shape
    • B23C5/20—Milling-cutters characterised by physical features other than shape with removable cutter bits or teeth or cutting inserts

Definitions

  • the present invention relates to a cutting insert that is attached to a tool body and used for cutting processing, and to an indexable cutting tool in which the cutting insert is removably attached to the tool body.
  • a cutting insert having a substantially rectangular shape with long and short sides, a fixing through hole penetrating the center of the front and back sides, and corner cutting edges formed at two curved corners of the front and back sides is used, and a fixing screw is passed through the fixing through hole penetrating the center of the front and back sides of the cutting insert so that the long side of the cutting insert is aligned with the axial direction of the tool body, and the cutting insert is detachably attached to the tool body by the fixing screw.
  • a cutting insert with a short short side length is used, and this cutting insert is firmly attached to the tool body using a fixing screw with a large diameter. Even when the diameter of the fixing through hole provided in the cutting insert is increased, the cutting insert is prevented from being damaged during cutting processing, and high-feed processing and the like can be performed stably.
  • a cutting insert having a generally rectangular shape in plan view with long and short sides, a fixing through hole penetrating the center of the front and back sides, and corner cutting edges formed at two curved corners of the front and back sides, has been used in which the long sides of the cutting insert are aligned along the axial direction of the tool body, and a fixing screw is passed through the fixing through hole penetrating the center of the front and back sides of the cutting insert, and the cutting insert is detachably attached to the tool body by the fixing screw.
  • a large-diameter fixing screw is used to firmly attach a cutting insert having a short short side to the tool body as described above, it is necessary to increase the diameter of the fixing hole that penetrates the center of the front and back sides of the cutting insert.
  • the distance between the fixing hole and the long side of the cutting insert becomes narrow, reducing the strength between the fixing hole and the long side of the cutting insert, which can cause problems such as breakage of the cutting insert during cutting operations such as high-feed processing.
  • the present invention aims to solve the above problems in an indexable cutting tool, which uses a cutting insert that is generally rectangular in plan view with long and short sides, has a fixing through hole that passes through the center of the front and back sides, and has corner cutting edges formed at two curved corners on each of the front and back sides, and has the long sides of the cutting insert aligned with the axial direction of the tool body, a fixing screw is passed through the fixing through hole that passes through the center of the front and back sides of the cutting insert, and the cutting insert is removably attached to the tool body by the fixing screw.
  • the present invention is characterized in that, in an indexable cutting tool as described above, when a cutting insert having a short short side is firmly attached to the tool body with a large-diameter fixing screw, even if the diameter of the fixing through-hole penetrating the center of the front and back sides of the cutting insert is increased, the gap between the fixing through-hole and the long side of the cutting insert does not narrow, preventing a decrease in strength between the fixing through-hole and the long side of the cutting insert, and thus appropriately preventing damage to the cutting insert during cutting operations such as high-feed processing.
  • the cutting insert of the present invention has a generally rectangular shape in plan view with long and short sides, a fixing insertion hole penetrating the center of the front and back sides, and corner cutting edges formed at two curved corners on the front and back sides, and the distance between the centers of the opposing long sides on the front and back sides is made larger than the distance on the short sides.
  • the distance between the centers of the opposing long sides on the front and back sides of the cutting insert is made larger than the distance between the short sides, even if the diameter of the fixing through hole that passes through the center of the front and back sides of the cutting insert is increased, the distance between the fixing through hole and the long side of the cutting insert is prevented from narrowing, and a decrease in strength between the fixing through hole and the long side of the cutting insert is prevented.
  • the distance between the opposing long sides on the front and back sides when the distance between the centers of the opposing long sides on the front and back sides is made larger than the distance between the short sides as described above, the distance between the opposing long sides can be set so that it tapers from the center of the long sides toward each short side.
  • the center of the long sides protrudes significantly from the short sides, and when the long sides of the cutting insert are attached to the tool body so that they are aligned with the axial direction of the tool body and the corner cutting edge of the cutting insert is used to perform pocket machining or the like on the workpiece, it becomes difficult to position the corner cutting edge located on the outer periphery of the tip of the cutting insert more outer than the center of the long sides, and the center of the long sides protrudes outward from the corner cutting edge and hits the wall of the workpiece, making it impossible to machine the corners of the wall surface or pocket with the corner cutting edge of the cutting insert.
  • the angle of inclination at which the tapered portion contracts from the center of the long side toward each short side be in the range of 1° to 10°, and it is even more preferable that the angle of inclination be in the range of 3° to 5°.
  • the cutting insert of the present invention if the ratio (D:W) of the hole diameter D of the fixing insertion hole to the spacing W of the centers of the opposing long sides becomes too small, the spacing between the centers of the long sides and the fixing insertion hole becomes narrow, and the strength of the long sides of the cutting insert cannot be sufficiently increased.
  • the hole diameter D of the fixing insertion hole becomes smaller than the spacing W of the centers of the opposing long sides, and the cutting insert cannot be firmly attached to the tool body using a fixing screw with a large diameter, and the spacing W of the centers of the opposing long sides becomes too large, resulting in a problem that the cutting insert becomes large.
  • the ratio (D:W) of the hole diameter D of the fixing insertion hole to the distance W between the centers of the opposing long sides is in the range of 1:1.6 to 1:3, and it is even more preferable that the ratio (D:W) is in the range of 1:1.8 to 1:2.
  • the center of each of the short sides is formed to protrude outward in the long side direction, and a main cutting edge is provided on the short side continuing from the corner cutting edges provided at the two curved corners on the front and back sides, and a minor cutting edge is provided on the short side opposite the main cutting edge to the corner cutting edge.
  • the corner cutting edge can cut the wall surface of the corner of the workpiece, and the main cutting edge continuing from the corner cutting edge can cut the bottom of the workpiece.
  • the minor cutting edge on the opposite side of the corner cutting edge to the main cutting edge can cut the workpiece appropriately.
  • the ratio (W:L) of the distance W between the central portions of the opposing long sides to the longitudinal length L of the long sides can be set in the range of 1:1.2 to 1:2.5.
  • a cutting insert is used that is substantially rectangular in plan view having long and short sides, has a fixing insertion hole that penetrates the center of the front and back sides, and has corner cutting edges formed at two curved corners on the front and back sides, and the long sides of the cutting insert are aligned along the axial direction of the tool body, and a fixing screw is passed through the fixing insertion hole that penetrates the center of the front and back sides of the cutting insert, and the cutting insert is detachably attached to the tool body by the fixing screw.
  • a cutting insert is used in which the distance between the centers of the opposing long sides on the front and back sides of the cutting insert is larger than the distance on the short side, and when the cutting insert is attached to the tool body, the corner cutting edge located on the outer periphery of the tip of the cutting insert is attached to the outer periphery of the tool body from the part where the distance between the centers of the long sides is larger.
  • the strength between the fixing insertion hole and the long sides of the cutting insert is not reduced even if the diameter of the fixing insertion hole that passes through the center of the front and back sides of the cutting insert is increased, and the cutting insert can be firmly attached to the tool body using a fixing screw with a large diameter.
  • the corner cutting edge located on the outer periphery of the tip of the cutting insert is located on the outer periphery of the tool body further away from the part where the gap between the central parts of the long sides is larger. Therefore, when performing pocket machining or the like on a workpiece with the corner cutting edge of the cutting insert, the center of the long side does not protrude outward beyond the corner cutting edge and hit the wall of the workpiece, and the corner cutting edge of the cutting insert can properly cut the wall of the workpiece, making it possible to properly perform pocket machining or the like.
  • the cutting insert has a generally rectangular planar shape with long and short sides, and has corner cutting edges formed at two corners on each of the front and back sides.
  • the cutting insert is used in which the distance between the centers of the opposing long sides on the front and back sides of the cutting insert is greater than the distance on the short sides. Therefore, even if the diameter of the fixing insertion hole that passes through the center of the front and back sides of the cutting insert is increased, the strength between the fixing insertion hole and the long sides of the cutting insert is not reduced, and the cutting insert can be firmly attached to the tool body using a fixing screw with a large diameter. This makes it possible to perform stable cutting without the cutting insert being damaged during cutting operations such as high feed processing.
  • the corner cutting edge located on the outer periphery of the tip of the cutting insert is attached so that it is located on the outer periphery of the tool body further away from the part where the gap between the central parts of the long sides is larger. Therefore, when performing pocket machining or the like on a workpiece using the corner cutting edge of the cutting insert, the center of the long side does not protrude outward beyond the corner cutting edge and hit the wall of the workpiece, and the corner cutting edge of the cutting insert can properly cut the wall of the workpiece, making it possible to properly perform pocket machining or the like.
  • FIG. 1 is a schematic plan view showing a cutting insert according to an embodiment of the present invention.
  • FIG. 2 is a schematic perspective view showing the cutting insert according to the same embodiment.
  • FIG. 2 is a schematic side view showing the cutting insert according to the same embodiment.
  • 2 is a schematic plan view showing an indexable cutting tool in which the cutting insert according to the embodiment is attached to a tool body.
  • FIG. 1 is a schematic front view showing an indexable cutting tool in which the cutting insert according to the embodiment is attached to a tool body.
  • FIG. FIG. 5 is an enlarged cross-sectional view showing a state in which the indexable cutting tool shown in FIG.
  • FIG. 4 is rotated to cut the wall surface of a corner of a workpiece with a corner cutting edge of a cutting insert attached to the tool body, and cut the bottom surface of the workpiece with a main cutting edge.
  • FIG. 5 is an enlarged cross-sectional view showing a state in which the indexable cutting tool shown in FIG. 4 is rotated to cut the bottom surface of a workpiece in a direction inclined obliquely downward with the minor cutting edge of a cutting insert attached to the tool body.
  • the cutting insert 10 in this embodiment is formed in a generally rectangular shape with long sides 11 and short sides 12 in plan view, with a fixing insertion hole 13 penetrating the center of the generally rectangular front surface 10a and back surface 10b, and corner cutting edges 14a are provided at two diagonally opposite corners of the front surface 10a and back surface 10b, and at two curved corners extending from the long sides 11 to the short sides 12.
  • the cutting insert 10 is detachably attached to the tool body 20 by passing a fixing screw 30 through the fixing insertion hole 13 provided in the center of the cutting insert 10 so that the long side portion 11 of the cutting insert 10 is aligned with the axial direction of the tool body 20, as described below.
  • the spacing W between the centers of the opposing long side portions 11 on the front surface portion 10a and the back surface portion 10b is made larger than the spacing on the short side portion 12 side, so that the spacing between the opposing long side portions 11 tapers from the center of the long side portions 11 toward each short side portion 12 side.
  • the inclination angle ⁇ of the tapered contraction is adjusted to be within the range of 1° to 10°, and preferably within the range of 3° to 5°. In this embodiment, the inclination angle ⁇ is set to about 3°.
  • the hole diameter D of the fixing through hole 13 provided in the center of the cutting insert 10 can be made larger, and the cutting insert 10 can be firmly attached to the tool body 20 using a fixing screw 30 with a large diameter.
  • the ratio (D:W) of the hole diameter D of the fixing through hole 13 to the distance W between the centers of the opposing long side portions 11 is set to a range of 1:1.6 to 1:3, and preferably to a range of 1:1.8 to 1:2. Note that in this embodiment, the ratio (D:W) is set to about 1:1.83.
  • each short side 12 on the front surface 10a and back surface 10b is formed to protrude outward, and as described above, corner cutting edges 14a are provided at two diagonally positioned corners on the front surface 10a and back surface 10b, two curved corners extending from the long side 11 to the short side 12, and main cutting edges 14b are provided on each short side 12 so as to be continuous with each corner cutting edge 14a, and further, minor cutting edges 14c are provided on each short side 12 opposite the corner cutting edges 14a relative to each main cutting edge 14b.
  • a chip discharge groove 15 for discharging chips cut by the corner cutting edge 14a, the main cutting edge 14b, and the minor cutting edge 14c is provided along the corner cutting edge 14a, the main cutting edge 14b, and the minor cutting edge 14c on the front surface 10a and the back surface 10b.
  • the ratio (W:L) of the distance W between the centers of the opposing long sides 11 to the length L of the long sides 11 in the longitudinal direction is set to a range of 1:1.2 to 1:2.5 so that the length L of the long sides 11 in the longitudinal direction is not too long or too short compared to the distance W between the centers of the opposing long sides 11.
  • the ratio (W:L) is set to approximately 1:1.67.
  • the cutting insert 10 is used, and as shown in Figures 4 and 5, the cutting insert 10 is attached to each of the insert mounting seats 21 provided on both sides of the axis at the tip of the tool body 20.
  • the long side 11 of the cutting insert 10 is aligned along the axial direction of the tool body 20, and the corner cutting edge 14a located on the outer periphery of the tip of the cutting insert 10 is positioned closer to the outer periphery of the tool body 20 than the part where the spacing W of the central part of the long side 11 becomes larger.
  • the cutting insert 10 is then set in the insert mounting seat 21, and the fixing screw 30 is passed through the fixing insertion hole 13 in the cutting insert 10, and the cutting insert 10 is attached to the insert mounting seat 21 of the tool body 20 with the fixing screw 30.
  • the indexable rotary cutting tool is rotated around the axis of the tool body 20 as described above to perform ramping cutting or the like on the workpiece X, as shown in FIG. 7, if the cutting insert 10 attached to the tool body 20 is moved in a direction that slopes diagonally downward relative to the bottom surface Xb of the workpiece X, the bottom surface Xb of the workpiece X is cut in a direction that slopes diagonally downward by the minor cutting edge 14c of the cutting insert 10.
  • the hole diameter D of the fixing insertion hole 13 provided in the center of the cutting insert 10 can be increased and a large-diameter fixing screw 30 can be used to firmly attach the cutting insert 10 to the tool body 20, and the spacing between the fixing insertion hole 13 and the long sides 11 on both sides of it can be secured, so that the strength of the cutting insert 10 is not reduced and high-feed machining can be performed stably.
  • Cutting insert 10a Surface portion 10b: Back surface portion 11: Long side portion 12: Short side portion 13: Fixing insertion hole 14a: Corner cutting edge 14b: Main cutting edge 14c: Minor cutting edge 15: Chip discharge groove 20: Tool body 21: Insert mounting seat 30: Fixing screw D: Hole diameter X: Workpiece Xa: Wall surface Xb: Bottom surface ⁇ : Inclined angle

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)

Abstract

La présente invention concerne une plaquette de coupe (10) qui a une forme dans une vue en plan sensiblement rectangulaire ayant des parties latérales longues (11) et des parties latérales courtes (12), et dans laquelle un trou d'insertion de fixation (13) pénétrant à travers les centres d'une partie de surface avant (10a) et d'une partie de surface arrière (10b) est disposé et un bord de coupe de coin (14a) est formé au niveau de chacune des deux parties de coin incurvées sur la partie de surface avant et la partie de surface arrière, de sorte que dans la partie de surface avant et la partie de surface arrière, l'espacement (W) entre les centres des parties latérales longues opposées est supérieur à l'espacement entre les parties latérales longues sur le côté des parties latérales courtes.
PCT/JP2022/042417 2022-11-15 2022-11-15 Plaquette de coupe et outil de coupe de type à bord de lame remplaçable WO2024105785A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2022/042417 WO2024105785A1 (fr) 2022-11-15 2022-11-15 Plaquette de coupe et outil de coupe de type à bord de lame remplaçable
JP2022576212A JPWO2024105785A1 (fr) 2022-11-15 2022-11-15

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/042417 WO2024105785A1 (fr) 2022-11-15 2022-11-15 Plaquette de coupe et outil de coupe de type à bord de lame remplaçable

Publications (1)

Publication Number Publication Date
WO2024105785A1 true WO2024105785A1 (fr) 2024-05-23

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PCT/JP2022/042417 WO2024105785A1 (fr) 2022-11-15 2022-11-15 Plaquette de coupe et outil de coupe de type à bord de lame remplaçable

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WO (1) WO2024105785A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013018724A1 (fr) * 2011-07-29 2013-02-07 株式会社タンガロイ Plaquette de coupe et outil de coupe rotatif
WO2014156225A1 (fr) * 2013-03-26 2014-10-02 住友電工ハードメタル株式会社 Insert de coupe et fraise à lames rapportées l'utilisant
US20200338652A1 (en) * 2017-11-14 2020-10-29 Korloy Inc. Cutting insert and cutting tool having same mounted therein

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013018724A1 (fr) * 2011-07-29 2013-02-07 株式会社タンガロイ Plaquette de coupe et outil de coupe rotatif
WO2014156225A1 (fr) * 2013-03-26 2014-10-02 住友電工ハードメタル株式会社 Insert de coupe et fraise à lames rapportées l'utilisant
US20200338652A1 (en) * 2017-11-14 2020-10-29 Korloy Inc. Cutting insert and cutting tool having same mounted therein

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JPWO2024105785A1 (fr) 2024-05-23

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