WO2014065228A1 - Plaquette de coupe et outil de coupe ayant un bord de coupe remplaçable - Google Patents

Plaquette de coupe et outil de coupe ayant un bord de coupe remplaçable Download PDF

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Publication number
WO2014065228A1
WO2014065228A1 PCT/JP2013/078434 JP2013078434W WO2014065228A1 WO 2014065228 A1 WO2014065228 A1 WO 2014065228A1 JP 2013078434 W JP2013078434 W JP 2013078434W WO 2014065228 A1 WO2014065228 A1 WO 2014065228A1
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WO
WIPO (PCT)
Prior art keywords
insert
cutting
cutting edge
tool
polygonal
Prior art date
Application number
PCT/JP2013/078434
Other languages
English (en)
Japanese (ja)
Inventor
今井　康晴
宙志 保木
Original Assignee
三菱マテリアル株式会社
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Filing date
Publication date
Application filed by 三菱マテリアル株式会社 filed Critical 三菱マテリアル株式会社
Publication of WO2014065228A1 publication Critical patent/WO2014065228A1/fr

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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
    • B23C5/06—Face-milling cutters, i.e. having only or primarily a substantially flat cutting surface
    • 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
    • B23C5/202—Plate-like cutting inserts with special form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/04—Overall shape
    • B23C2200/0455—Square
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/08—Rake or top surfaces
    • B23C2200/085—Rake or top surfaces discontinuous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/12—Side or flank surfaces
    • B23C2200/125—Side or flank surfaces discontinuous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/20—Top or side views of the cutting edge
    • B23C2200/205—Discontinuous cutting edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/16—Fixation of inserts or cutting bits in the tool
    • B23C2210/168—Seats for cutting inserts, supports for replacable cutting bits

Definitions

  • the present invention relates to a cutting insert used for milling, for example, and a cutting edge exchangeable cutting tool using the same.
  • a blade-tip-exchangeable cutting tool such as a milling cutter for milling a work material made of a metal material or the like.
  • the cutting edge exchangeable cutting tool is a tool body made of steel or the like and made of a hard material such as cemented carbide, and a plurality of insert mounting seats formed on the outer periphery of the tip of the tool body at intervals in the circumferential direction. And a cutting insert that is detachably attached to.
  • a cutting insert for example, as shown in Patent Document 1 below, a polygonal plate shape is formed, and an insert body that is symmetrically reversed, and a pair of polygonal surfaces that face the thickness direction of the insert body And a plurality of side surfaces facing a direction perpendicular to the thickness direction of the insert main body, and a cutting edge formed at an intersecting ridge line between the polygonal surface and the side surface is known.
  • a double-sided type cutting insert since the insert body has a reverse-inverted symmetrical shape, a large number of cutting edges can be secured, so that the cutting insert has a long life.
  • the cutting edge is used for cutting, and the seat portion formed on the other polygonal surface is seated on the insert mounting seat of the tool body.
  • it is conceivable to shorten the distance L from the seating portion of the other polygonal surface to the cutting edge of the one polygonal surface see reference numeral L in FIGS. 9 and 14).
  • the height of the seating portion may be lowered. That is, the position L of the seating portion along the thickness direction of the insert body is retracted toward the inside of the insert along the thickness direction, thereby shortening the distance L between the seating portion and the cutting blade used for cutting. can do. Thereby, while the moment by a cutting load is reduced, the seating stability of the cutting insert with respect to an insert mounting seat is improved, chatter vibration is suppressed, and processing accuracy can be improved.
  • the present invention has been made in view of such circumstances, and while ensuring the rigidity of the insert body, it can improve seating stability and improve processing accuracy, and damage to unused blades due to scraping of chips. It is an object of the present invention to provide a cutting insert capable of preventing tooling and extending the tool life, and a cutting edge replaceable cutting tool using the same.
  • the present invention proposes the following means. That is, the present invention is a cutting insert that is detachably mounted on an insert mounting seat formed on a tool body of a blade-tip-exchange-type cutting tool, and has a polygonal plate shape, and an insert body that has a reverse-inverted symmetrical shape. And a pair of polygonal surfaces facing the thickness direction of the insert body, a plurality of side surfaces facing the direction perpendicular to the thickness direction of the insert body, and an intersection ridge line between the polygonal surface and the side surfaces. A cutting edge for finishing, which extends so as to form an obtuse angle between the main cutting edge and the main cutting edge when the polygonal surface is viewed in front.
  • the polygonal surface has a ridge extending from the secondary cutting edge toward the center of the polygonal surface, and is disposed adjacent to the ridge, and has a thickness greater than that of the ridge. Seating part retracted inside the insert along the direction , Characterized in that it is formed.
  • the pair of polygonal surfaces of the insert body has a ridge extending from the secondary cutting edge of the cutting edge toward the center of the polygonal surface, It is made to recede from the ridge.
  • this cutting insert is mounted on the insert mounting seat of the tool body, one of the polygonal surfaces of the pair of polygonal surfaces is subjected to cutting, and the seating portion of the other polygonal surface is seated on the insert mounting seat.
  • the height of the seating portion is low (retracted from the ridge to the inside of the insert along the thickness direction of the insert body), so that the one polygonal surface is used for cutting.
  • the distance from the cutting edge to the insert mounting seat is shortened. As a result, the moment due to the cutting load acting on the cutting insert is reduced, the seating stability of the cutting insert is increased, chatter vibration and the like are suppressed, and the machining accuracy of cutting can be improved.
  • chips generated by cutting the work material by the cutting edge flow on the one polygonal surface from the cutting edge, and are quickly discharged from the polygonal surface by being applied to the ridge. It has come to be. Thereby, for example, chips are effectively prevented from flowing on the one polygonal surface from the cutting edge used for cutting and reaching the other cutting edge (unused blade). Therefore, damage to unused blades can be prevented and the tool life can be extended.
  • the ridge portion extends on the polygonal surface, the ridge portion acts like a beam, and the rigidity of the insert body is ensured.
  • the ridge portion of the polygonal surface extends from the auxiliary cutting edge of the outer peripheral edge portion of the polygonal surface toward the central portion, and the operational effect of the beam is remarkably obtained.
  • the edge strength of the secondary cutting edge is also ensured. That is, among the cutting edges, the secondary cutting edge, which is a wiping edge (finishing edge) for finishing, has a sharper edge than the main cutting edge and is relatively easily damaged.
  • the rigidity of the secondary cutting edge Since the edge is secured by the ridge, the cutting edge strength of the auxiliary cutting edge is increased and chipping and chipping are suppressed, so that the machining surface accuracy of the work material is stably maintained at high quality.
  • the cutting insert of the present invention while ensuring the rigidity of the insert body, the seating stability can be improved and the processing accuracy can be improved, and damage to unused blades due to scraping of chips can be prevented. Life can be extended.
  • a breaker extending along the cutting edge is formed between the seating portion and the cutting edge on the polygonal surface, and the breaker is at least a part of the breaker. It is good also as the above being made to retreat inside the insert along the thickness direction rather than the seating part.
  • the chip is easily curled by the breaker part that is retracted from the seating part, and is easily discharged from the polygonal surface at an early stage, so that the chip is scraped or welded to the seating part. It is suppressed.
  • the cutting insert is inverted and the seating stability of the cutting insert when the seating portion is seated on the insert mounting seat of the tool body is sufficiently ensured, and the above-described effects can be obtained more remarkably. It will be.
  • the main cutting edge of the cutting edge is gradually inclined toward the inner side of the insert along the thickness direction as it goes to the opposite side to the sub cutting edge adjacent to the main cutting edge. It is good also as extending.
  • the cutting insert is a double-sided type negative insert
  • the axial rake angle of the main cutting edge can be easily set to the positive angle, and the sharpness of the main cutting edge is enhanced.
  • the chips generated by cutting the main cutting edge formed in such an inclined manner easily flow to the unused blade in the conventional configuration. According to the present invention, even if the main cutting edge is formed to be inclined as described above, it is possible to effectively prevent chips from flowing to the unused blade by adopting a special configuration called a ridge portion.
  • the present invention has a disk shape, is rotated around the tool axis, and has a tool body in which a plurality of the insert mounting seats are formed on the outer periphery of the tip, and is detachably mounted on the insert mounting seat.
  • a cutting edge exchangeable cutting tool including a clamp screw for fixing the cutting insert to the tool body, wherein the clamp screw includes a screw shaft portion and a head having a larger diameter than the screw shaft portion.
  • the chip guide portion gradually extending obliquely towards the central axis is formed in accordance with away from the threaded shaft portion along the central axis of the mounting hole.
  • a chip guide is formed on the head, so that chips flowing on the polygonal surface from the cutting blade used for cutting are Even if it hits, it becomes easy to be discharged smoothly and chip clogging is prevented.
  • the chips flowing on the polygonal surface are suddenly changed in direction or caught by hitting the head of the clamp screw, and the chips do not flow smoothly. There was a risk of chip clogging.
  • the chip hits the head of the clamp screw, the chip is guided to the chip guide formed on the head of the clamp screw at an early and smooth time on the polygonal surface. It is discharged from and prevents clogging.
  • the cutting insert and cutting edge-exchangeable cutting tool of the present invention while ensuring the rigidity of the insert body, it is possible to improve the seating stability and improve the processing accuracy, and to prevent the unused blade from being damaged by scraping of chips. Tool life can be extended.
  • FIG. 8 is a diagram showing an AA cross section of FIG. 7.
  • FIG. 8 is a view showing a BB cross section of FIG. 7.
  • the cutting insert 1 which concerns on one Embodiment of this invention, and the blade-tip-exchange-type cutting tool 30 using the same are demonstrated with reference to drawings.
  • the cutting insert 1 of this embodiment performs milling etc. on the workpiece which consists of metal materials etc.
  • the blade-tip-exchange-type cutting tool 30 using this cutting insert 1 is a milling cutter, for example.
  • the cutting edge exchange type cutting tool 30 has a disk shape made of steel or the like, is rotated around the tool axis O1, and an insert mounting seat 32 is circumferentially spaced at the outer periphery of the tip.
  • a plurality of tool bodies 31 formed with a plurality of holes, a hard material such as cemented carbide, a plurality of cutting inserts 1 detachably attached to the insert mounting seat 32, a steel material, and the like, which will be described later.
  • a clamp screw 20 for fixing the cutting insert 1 to the tool body 31 by being screwed into the insert mounting seat 32.
  • the cutting insert 1 can be removed from the tool body 31 by loosening the screw of the clamp screw 20 screwed to the insert mounting seat 32 and removing the clamp screw 20 from the insert mounting seat 32. Thus, the cutting insert 1 can be attached to and detached from the insert mounting seat 32 of the tool body 31.
  • the tool body 31 has a disk shape (including a columnar shape) centered on the tool axis O1.
  • a tool mounting hole 33 extending along the tool axis O ⁇ b> 1 is formed in the tool body 31 so as to penetrate the tool body 31.
  • a key groove 35 extending from the opening edge of the tool mounting hole 33 toward the radially outer side is formed on the end surface 34 facing the base end side (upper side in FIG. 3) along the tool axis O1 direction in the tool body 31. ing.
  • the tool main body 31 is attached to the tip of the spindle by a bolt member inserted into the tool attachment hole 33 in a state where the key groove 35 is fitted to a key provided at the tip of the spindle of a machine tool (not shown).
  • the workpiece is rotated in the tool rotation direction T around the tool axis O1, and is used for cutting the work material.
  • the direction along the tool rotation direction T is referred to as the front of the tool rotation direction T, and the direction toward the opposite side (counter tool rotation direction) is referred to as the rear of the tool rotation direction T.
  • a pocket 36 is formed.
  • a plurality of chip pockets 36 are formed on the outer peripheral portion of the tip of the tool body 31 with an interval in the circumferential direction.
  • the insert pocket 36 is formed with an insert mounting seat 32 that is positioned at the end of the tip pocket 36 at the rear in the tool rotation direction T and faces the front in the tool rotation direction T.
  • a coolant supply hole is formed in the chip pocket 36 so as to open toward the cutting edge 5 of the cutting insert 1 attached to the insert mounting seat 32.
  • the insert mounting seat 32 is formed in a concave shape on the wall surface facing the front in the tool rotation direction T in the chip pocket 36 so as to correspond to the shape of the cutting insert 1.
  • the insert mounting seat 32 is formed in a polygonal hole shape corresponding to the shape of the cutting insert 1 having a polygonal plate shape.
  • the insert mounting seat 32 is not limited to the polygonal hole shape as long as the seating portion 13 described later of the cutting insert 1 can be seated.
  • the insert mounting seat 32 includes a bottom wall 37 that comes into contact with a later-described seating portion 13 of the cutting insert 1 and a pair of side walls 38 that come into contact with the side surface 4 of the cutting insert 1.
  • the bottom wall 37 is formed with a female screw hole 39 in which the clamp screw 20 can be screwed and a plurality of concave portions 40 having a groove shape corresponding to a ridge portion 12 (to be described later) of the cutting insert 1. ing.
  • the female screw hole 39 is disposed at the center of the bottom wall 37, and the plurality of recesses 40 are formed extending in an X shape with the female screw hole 39 as the center.
  • the cutting insert 1 has a polygonal plate shape, and an insert body 2 that is reversely symmetrical, and a pair of polygonal surfaces 3 that face the thickness direction of the insert body 2. And a plurality of side surfaces 4 facing the direction perpendicular to the thickness direction of the insert main body 2, and a cutting edge 5 formed on the intersecting ridge line of the polygonal surface 3 and the side surface 4.
  • This cutting insert 1 is a so-called double-sided type negative insert.
  • the insert body 2 of the present embodiment has a quadrangular plate shape, and the pair of polygonal surfaces 3 are each formed in a quadrangular surface shape.
  • the insert body 2 is formed with a mounting hole 7 that penetrates the insert body 2 in the thickness direction and is opened at the center of the pair of polygonal surfaces 3.
  • the opening portions (both end portions along the thickness direction) of the mounting hole 7 have a larger diameter than portions other than the opening portions, and are along the thickness direction of the insert body 2. The diameter gradually increases toward the outside of the insert.
  • the cutting insert 1 has a 90 ° rotationally symmetric shape around the central axis of the mounting hole 7. That is, the central axis of the mounting hole 7 is coaxial with the central axis of the cutting insert 1, and in the present specification, this central axis is referred to as the insert axis O2 in distinction from the tool axis O1 described above.
  • the insert body 2 has a 180 ° rotationally symmetric shape with respect to a symmetry line O ⁇ b> 3 orthogonal to the insert axis O ⁇ b> 2 and passing through the center of the side surface 4, whereby the insert body 2 and the cutting insert 1 are formed. Is a reverse-symmetrical shape.
  • a plurality of cutting edges 5 are formed on the outer peripheral edge of the polygonal surface 3.
  • the polygonal surface 3 is formed in a quadrangular surface shape having four sides and four corners. More specifically, the polygonal surface 3 has four lengths constituting the side. It has a side and four short sides and eight corners constituting the corner, and is strictly formed in an octagonal surface, and has one long side (main cutting edge 8 described later).
  • a set of cutting edges 5 having a short side (sub cutting edge 9 described later) and four (four sets) are arranged along the circumferential direction of the polygonal surface 3.
  • the circumferential direction is a direction that circulates around the insert axis O2.
  • the cutting edge 5 is formed in a region (side part) corresponding to the long side of the outer peripheral edge of the polygonal surface 3, and corresponds to the main cutting edge 8 used for main cutting and the short side.
  • a secondary cutting edge (sweeper blade) 9 for finishing that is formed in a region (corner) and extends so as to form an obtuse angle with the main cutting edge 8 when the polygonal surface 3 is viewed in front.
  • a curved corner blade 10 formed in a region (corner portion) corresponding to a corner portion where the long side and the short side intersect, and smoothly connecting the main cutting edge 8 and the sub cutting edge 9; Have. Note that the corner blade 10 may not be provided.
  • the main cutting edge 8 of the cutting edge 5 is adjacent to the main cutting edge 8 (in this embodiment, the main cutting edge 8 is adjacent to the main cutting edge 8 with the corner blade 10 sandwiched therebetween).
  • the secondary cutting edge 9 of the cutting edge 5 is a main cutting edge 8 adjacent to the secondary cutting edge 9 (in this embodiment, the corner cutting edge 10 is sandwiched between the secondary cutting edges 9).
  • the corner blade 10 has a convex curve shape in the side view shown in FIGS. 8 and 12 and the top view shown in FIG.
  • FIG. 4 shows, in the polygonal surface 3, the main cutting edge 8 in one cutting edge 5A among the pair (two sets) of cutting edges 5 adjacent in the circumferential direction and the other cutting edge 5B.
  • the auxiliary cutting edge 9 is smoothly connected by the connecting blade 11.
  • the connecting blade 11 has a concave curve portion having a long blade length and a convex curve portion having a short blade length, and has a concave curve shape as a whole. Since the connecting blade 11 is not a blade cut into the work material, it does not need to be provided.
  • the polygonal surface 3 includes a ridge portion 12 extending from the auxiliary cutting edge 9 of the cutting edge 5 toward the center portion of the polygonal surface 3, and a ridge portion 12. And a breaker 14 extending along the cutting edge 5 is formed.
  • the seat 13 is disposed in the insert body 2 along the thickness direction of the insert body 2 relative to the ridge portion 12.
  • the ridge portion 12 extends from the auxiliary cutting edge 9 located at the short side of the outer peripheral edge portion of the polygonal surface 3 to the mounting hole 7 located at the central portion of the polygonal surface 3. Extends perpendicularly to the insert axis O2. That is, the ridge portion 12 extends between the short side of the outer peripheral edge of the polygonal surface 3 and the central portion of the polygonal surface 3. Corresponding to the two short sides, the four ridges 12 are formed to have a radial shape centered on the insert axis O2.
  • the width (length along the circumferential direction of the polygonal surface 3) of the upper end surface (end surface facing the insert outer side along the thickness direction of the insert body 2) in the ridge portion 12 is in the vicinity of the short side of the polygonal surface 3. Is made the widest and gradually becomes narrower from the vicinity of the short side toward the center. On the other hand, the width of the bottom of the ridge portion 12 is substantially constant along the direction in which the ridge portion 12 extends.
  • the height of the ridge portion 12 (the length along the thickness direction of the insert body 2) is substantially constant at the central portion along the direction in which the ridge portion 12 extends.
  • the portion located on the short side of the polygonal surface 3 from the portion is made higher than the central portion, and the portion located on the central portion side of the polygonal surface 3 from the central portion is lower than the central portion.
  • the inner end portion facing the mounting hole 7 in the ridge portion 12 (the end portion positioned on the central portion side of the polygonal surface 3 from the central portion) It arrange
  • the head 22 of the clamp screw 20 is brought into contact with the entire circumference of the opening of the mounting hole 7 so that the frictional resistance is increased and the tightening force is secured, so that the clamp screw 20 is easily loosened. Is prevented.
  • the height of the ridge portion 12 is gradually lowered toward the seating portion 13 side adjacent in the circumferential direction, whereby the side surface of the ridge portion 12 is an inclined surface. Further, the width of the ridge portion 12 gradually becomes wider toward the insert inside along the thickness direction of the insert body 2.
  • the seating portion 13 is formed between the ridge portions 12 adjacent to each other in the circumferential direction on the polygonal surface 3.
  • the seat portion 13 has a flat shape (planar shape) perpendicular to the insert axis O2.
  • the seat portion 13 corresponds to a triangular flat surface portion (see FIG. 5) formed between the adjacent concave portions 40 in the bottom wall 37 of the insert mounting seat 32 to which the cutting insert 1 is mounted. , Triangular or trapezoidal.
  • the breaker 14 is formed inside the cutting edge 5 on the polygonal surface 3 and adjacent to the cutting edge 5.
  • the breaker 14 is formed at least between the seating portion 13 and the cutting edge 5 on the polygonal surface 3 and has a groove shape or an inclined surface shape extending along the cutting edge 5. Is formed between the seat portion 13 and the cutting edge 5 (main cutting edge 8) and between the ridge portion 12 and the cutting edge 5 (sub cutting edge 9).
  • the width of the breaker 14 is gradually or stepwise increased from the secondary cutting edge 9 to the main cutting edge 8 side of the adjacent cutting edge 5.
  • the width of the portion adjacent to the main cutting edge 8 of the cutting edge 5 in the breaker 14 is gradually increased toward the side opposite to the auxiliary cutting edge 9 adjacent to the main cutting edge 8. Is formed.
  • the breaker 14 gradually increases in thickness of the insert body 2 from the cutting edge 5 located at the outer peripheral edge of the polygonal surface 3 toward the center of the polygonal surface 3. Inclined toward the inside of the insert along the vertical direction. Moreover, as FIG.6, FIG.9, FIG.10 grade
  • the height of the breaker 14 is highest at the portion corresponding to the sub-cutting edge 9 of the adjacent cutting edge 5 and gradually lowered from the corner edge 10 toward the main cutting edge 8 side. Then, at least a part or more of the breaker 14 is retracted to the inside of the insert along the thickness direction of the insert body 2 from the seat portion 13.
  • the height of the breaker 14 is a portion of the main cutting edge 8 of the adjacent cutting edge 5 that is located on the side of the auxiliary cutting edge 9 adjacent to the main cutting edge 8 from the center thereof, the auxiliary cutting edge 9. And the area
  • the height of the breaker 14 is the height of the seating portion 13 in the region corresponding to the portion of the main cutting edge 8 that is located on the opposite side of the center cutting edge 8 from the center of the main cutting edge 8 opposite to the sub cutting edge 9. (See FIG. 10).
  • the breaker 14 includes a portion of the main cutting edge 8 located on the side of the auxiliary cutting edge 9 adjacent to the main cutting edge 8 from the center thereof, the auxiliary cutting edge 9, and a corner positioned therebetween.
  • region corresponding to the blade 10 it comprises an inclined surface shape,
  • the clamp screw 20 includes a screw shaft portion 21 that has been subjected to male screw processing, and a head portion 22 that has a larger diameter than the screw shaft portion 21.
  • 14 and 15 show a state in which the cutting insert 1 is mounted on the insert mounting seat 32 of the tool body 31 using the clamp screw 20 (however, the insert mounting seat 32 is not shown).
  • the screw shaft portion 21 of the clamp screw 20 is screwed into the female screw hole 39 of the insert mounting seat 32 (see FIG. 5). 14 and 15, a portion of the head 22 of the clamp screw 20 located on the side opposite to the screw shaft portion 21 and exposed to the outside from the mounting hole 7 of the cutting insert 1 is provided with the clamp.
  • a chip guide portion 23 is formed that gradually extends toward the central axis as the distance from the screw shaft portion 21 increases along the central axis (insert axis O2) of the mounting hole 7. .
  • the chip guide portion 23 is formed at an end portion of the head 22 of the clamp screw 20 that is located on the opposite side of the screw shaft portion 21.
  • the chip guide portion 23 is formed in a groove shape in the head portion 22 of the clamp screw 20 and has an annular shape extending in the circumferential direction. In the longitudinal sectional view shown in FIG. 15, the chip guide portion 23 has a concave curved shape as a whole.
  • tip guide part 23 is arrange
  • the inner peripheral edge of the seating portion 13 is positioned.
  • one polygonal surface 3 ⁇ / b> A of the pair of polygonal surfaces 3. Is arranged facing the front of the tool rotation direction T, and is a rake face.
  • the other polygonal surface 3B is arranged facing the rear in the tool rotation direction T and is seated on the bottom wall 37 of the insert mounting seat 32 shown in FIG. .
  • the seat portion 13 on the other polygonal surface 3 ⁇ / b> B is in contact with the bottom wall 37, and the ridge portion 12 adjacent to the seat portion 13 is accommodated in the recess 40 of the bottom wall 37.
  • the side surfaces 4 of the cutting insert 1 are in contact with the pair of side walls 38 of the insert mounting seat 32.
  • one polygonal surface 3A (rake face) is arranged on the distal end side of the tool body 31 and outside in the tool radial direction.
  • the set of cutting edges 5A thus made will be used for cutting.
  • the side surface 4 adjacent to the cutting edge 5A is a flank.
  • the side surface 4 of the cutting insert 1 has a first flank and a second flank that have different inclinations from the cutting edge 5 (the main cutting edge 8 and the corner edge 10 in the illustrated example). It is formed in order.
  • the ridge portion 12 is provided on the pair of polygonal surfaces 3 of the insert body 2 from the secondary cutting edge 9 of the cutting blade 5 toward the center of the polygonal surface 3.
  • the seating portion 13 is extended more than the ridge portion 12. As shown in FIG. 4, when the cutting insert 1 is mounted on the insert mounting seat 32 of the tool body 31, the cutting edge 5 ⁇ / b> A of one polygonal surface 3 ⁇ / b> A of the pair of polygonal surfaces 3 is used for cutting.
  • the seating portion 13 of the other polygonal surface 3B is seated on the insert mounting seat 32, but the height of the seating portion 13 is low (from the ridge portion 12 to the inside of the insert along the thickness direction of the insert body 2).
  • the chips generated by cutting the work material by the cutting edge 5 ⁇ / b> A flow on the one polygonal surface 3 ⁇ / b> A from the cutting edge 5 ⁇ / b> A and are applied to the ridge portion 12.
  • the surface 3A is discharged at an early stage. This effectively prevents, for example, chips from flowing from the cutting edge 5A used for cutting on the one polygonal surface 3A and reaching the other cutting edge 5B (unused blade). The Therefore, damage to unused blades can be prevented and the tool life can be extended.
  • a pair of ridges 12 are formed on the polygonal surface 3 so as to sandwich the seating portion 13 from the circumferential direction of the polygonal surface 3.
  • the ridge portion 12 located between the cutting edges 5A and 5B adjacent to each other in the circumferential direction causes chips generated by cutting with the cutting edge 5A to be located on the base end side (upper side in FIG. 3) of the tool axis O1 of the cutting edge 5A.
  • the cutting edge 5B is prevented from reaching the cutting edge 5B, and the ridge portion 12 is positioned between the cutting edges 5A and 5C adjacent in the circumferential direction. It is also prevented that chips reach the cutting edge 5C located on the left side.
  • the ridge portion 12 extends on the polygonal surface 3, the ridge portion 12 acts like a beam, and the rigidity of the insert body 2 is ensured.
  • the ridge portion 12 extends from the short side (sub cutting edge 9) of the polygonal surface 3 toward the center portion, so that this effect is remarkably obtained.
  • the ridge portion 12 of the polygonal surface 3 is extended from the secondary cutting edge 9 toward the central portion, so that the edge strength of the secondary cutting edge 9 is ensured. That is, among the cutting edges 5, the secondary cutting edge 9, which is a finishing blade (finishing edge), has a sharper edge than the main cutting edge 8 and is relatively easily damaged. Since the rigidity of the cutting edge 9 is ensured by the ridge portion 12, the cutting edge strength of the auxiliary cutting edge 9 is increased and chipping and chipping are suppressed, so that the machining surface accuracy of the work material is stabilized to high quality. Maintained.
  • the width of the upper end surface of the ridge portion 12 is the widest in the vicinity of the short side of the polygonal surface 3 (that is, in the vicinity of the secondary cutting edge 9), and the above-described effect is remarkably obtained. It is supposed to be.
  • the width of the bottom portion of the ridge portion 12 is substantially constant along the direction in which the ridge portion 12 extends, and this ridge portion 12 ensures the effect of increasing the rigidity of the insert body 2. .
  • the seating stability can be improved to improve the machining accuracy, and the unused blade can be prevented from being damaged due to scraping of chips.
  • the tool life can be extended.
  • the breaker 14 positioned between the cutting edge 5 and the seating portion 13 on the polygonal surface 3 and extending along the cutting edge 5 is at least partly thicker than the seating portion 13 in the thickness of the insert body 2. Since it is made to recede inside the insert along the direction, the following effects are produced. That is, the chip is easily curled by the breaker 14 portion retracted from the seating portion 13 in this manner, and the chip is easily discharged from the polygonal surface 3 at an early stage, so that the chip scrapes the seating portion 13. Such as welding is suppressed. Thereby, the cutting insert 1 is reversed, and the seating stability of the cutting insert 1 when the seat portion 13 is seated on the insert mounting seat 32 of the tool body 31 is sufficiently ensured, and the above-described effects are obtained. It will be obtained more remarkably.
  • the main cutting edge 8 of the cutting edge 5 extends incline toward the inner side of the insert along the thickness direction of the insert body 2 gradually toward the opposite side of the sub cutting edge 9 adjacent to the main cutting edge 8. Therefore, the following effects are produced. That is, while the cutting insert 1 is a double-sided type negative insert, the axial rake angle of the main cutting edge 8 can be easily set to a positive angle, and the sharpness of the main cutting edge 8 is enhanced. On the other hand, the chips generated by cutting the main cutting edge 8 formed in such an inclined manner easily flow to the unused blade in the conventional configuration. According to this embodiment, even if the main cutting edge 8 is inclined and formed as described above, it is possible to effectively prevent chips from flowing to the unused blade by adopting a special configuration called the ridge portion 12. Can be suppressed.
  • tip guide part 23 is formed in the head 22 in the clamp screw 20 which fixes the cutting insert 1 to the insert mounting seat 32 of the tool main body 31, it is polygonal from the cutting edge 5 used for cutting. Even if the chips flowing on the surface 3 hit the head 22, the chips are easily discharged smoothly, and chip clogging is prevented.
  • the conventional clamp screw 100 shown in FIGS. 16 and 17 chips flowing on the polygonal surface 3 are exposed to the outside from the mounting hole 7 in the head 101 of the clamp screw 100. When it hits the part, the direction is suddenly changed or caught, and the chips do not flow smoothly, and there is a possibility that the chips are clogged.
  • the clamp screw 20 of the present embodiment shown in FIGS. 13 to 15 when the chip hits the head 22 of the clamp screw 20, the chip guide portion 23 formed on the head 22 is not affected. As guided, it is discharged quickly and smoothly from the polygonal surface 3 to prevent clogging of chips.
  • the insert body 2 of the cutting insert 1 has a rectangular plate shape, and the polygonal surface 3 is formed in a rectangular shape corresponding to this, and the polygonal surface 3 has a cutting edge.
  • the insert body 2 of the cutting insert 1 only needs to have a polygonal plate shape.
  • the shape of the polygonal surface 3 is, for example, a triangular surface shape, a pentagonal surface shape, a hexagonal surface shape, a heptagonal surface shape, an octagonal surface shape, etc. Also good.
  • the number of sets of cutting edges 5 formed on the polygonal surface 3 may be other than the above-described four, for example, three, five, six, seven, eight, or the like.
  • the number of ridges 12, seats 13, and breakers 14 may be changed as appropriate in correspondence with the number of sets of cutting edges 5 or regardless of the number of sets of cutting edges 5.
  • the shape and arrangement of the main cutting edge 8, the sub cutting edge 9 and the corner edge 10 constituting the cutting edge 5 of the cutting insert 1 are not limited to those described in the above-described embodiment. Further, the shape and arrangement of the breaker 14 are not limited to those described in the above embodiment.

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

Abstract

La présente invention maintient la rigidité d'un corps de plaquette tout en permettant la stabilité d'assise et permettant ainsi d'améliorer la précision d'usinage, et empêche toute détérioration d'une lame non utilisée causée par le grattage des copeaux de manière à pouvoir prolonger la durée de vie des outils. L'invention concerne une plaquette de coupe (1) qui est montée de manière détachable sur un siège de montage de plaquette formé sur le corps d'outil d'un outil de coupe ayant un bord de coupe remplaçable et qui comporte : un corps de plaquette (2) qui constitue une forme de plaque polygonale et qui est symétrique quand il est inversé dans le sens avant/arrière de celui-ci ; deux surfaces polygonales (3) qui sont orientées dans le sens de l'épaisseur du corps de plaquette (2) ; une pluralité de surfaces latérales (4) qui sont orientées dans un sens qui est perpendiculaire au sens de l'épaisseur du corps de plaquette (2) ; et une lame de coupe (5) qui est formée sur la ligne d'arête d'intersection des surfaces polygonales (3) et des surfaces latérales (4). La plaquette de coupe (1) est caractérisée en ce qu'elle comporte formées sur les surfaces polygonales (3) : une section d'arête (12) qui s'étend depuis la lame de coupe secondaire (9) de la lame de coupe (5) de manière à être orientée vers le centre des surfaces polygonales (3) ; et une section d'assise (13) qui est agencée de manière adjacente par rapport à la section d'arête (12) et qui est plus rétractée par rapport à la section d'arête (12) vers un côté intérieur de la plaquette qui va dans le sens de l'épaisseur.
PCT/JP2013/078434 2012-10-23 2013-10-21 Plaquette de coupe et outil de coupe ayant un bord de coupe remplaçable WO2014065228A1 (fr)

Applications Claiming Priority (2)

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JP2012-234167 2012-10-23
JP2012234167A JP2014083632A (ja) 2012-10-23 2012-10-23 切削インサート及び刃先交換式切削工具

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WO2014065228A1 true WO2014065228A1 (fr) 2014-05-01

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150117969A1 (en) * 2013-10-29 2015-04-30 Kennametal Inc. Cutting insert and shim for heavy machining operations
JP5979619B2 (ja) * 2014-05-26 2016-08-24 株式会社タンガロイ 切削インサート、ボデーおよび切削工具

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3812071A4 (fr) * 2018-06-08 2022-03-23 Moldino Tool Engineering, Ltd. Plaquette de coupe et outil de coupe de type à remplacement de bord de coupe
US11969807B2 (en) 2020-01-15 2024-04-30 Taegutec Ltd. Insert and cutting tool assembly comprising same
US11583942B2 (en) 2020-10-19 2023-02-21 Iscar, Ltd. Reversible square-shaped cutting insert and rotary cutting tool
US11491560B1 (en) 2021-07-13 2022-11-08 Taegutec Ltd. Cutting insert and rotary cutting tool including same

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Publication number Priority date Publication date Assignee Title
JPH09295213A (ja) * 1996-05-07 1997-11-18 Mitsubishi Materials Corp スローアウェイチップ及びスローアウェイ式カッタ
WO2010137663A1 (fr) * 2009-05-28 2010-12-02 京セラ株式会社 Plaquette de coupe et outil de coupe, et procédé de découpage d'articles au moyen de ceux-ci
JP2011104738A (ja) * 2009-11-19 2011-06-02 Sumitomo Electric Hardmetal Corp 刃先交換式チップ

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09295213A (ja) * 1996-05-07 1997-11-18 Mitsubishi Materials Corp スローアウェイチップ及びスローアウェイ式カッタ
WO2010137663A1 (fr) * 2009-05-28 2010-12-02 京セラ株式会社 Plaquette de coupe et outil de coupe, et procédé de découpage d'articles au moyen de ceux-ci
JP2011104738A (ja) * 2009-11-19 2011-06-02 Sumitomo Electric Hardmetal Corp 刃先交換式チップ

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150117969A1 (en) * 2013-10-29 2015-04-30 Kennametal Inc. Cutting insert and shim for heavy machining operations
JP5979619B2 (ja) * 2014-05-26 2016-08-24 株式会社タンガロイ 切削インサート、ボデーおよび切削工具
JPWO2015182562A1 (ja) * 2014-05-26 2017-04-20 株式会社タンガロイ 切削インサート、ボデーおよび切削工具

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