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WO2017150541A1 - Insert de coupe et outil de coupe à bord remplaçable - Google Patents

Insert de coupe et outil de coupe à bord remplaçable Download PDF

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Publication number
WO2017150541A1
WO2017150541A1 PCT/JP2017/007820 JP2017007820W WO2017150541A1 WO 2017150541 A1 WO2017150541 A1 WO 2017150541A1 JP 2017007820 W JP2017007820 W JP 2017007820W WO 2017150541 A1 WO2017150541 A1 WO 2017150541A1
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WO
WIPO (PCT)
Prior art keywords
corner
insert
cutting edge
blade
cutting
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/JP2017/007820
Other languages
English (en)
Japanese (ja)
Inventor
正史 神原
宙志 保木
裕輝 目黒
将志 原
千波 坂本
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.)
Mitsubishi Materials Corp
Original Assignee
Mitsubishi Materials 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
Priority claimed from JP2016171161A external-priority patent/JP2017159440A/ja
Application filed by Mitsubishi Materials Corp filed Critical Mitsubishi Materials Corp
Publication of WO2017150541A1 publication Critical patent/WO2017150541A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
    • 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

Definitions

  • the present invention relates to a cutting insert that is detachably attached to a cutting edge exchangeable cutting tool, and a cutting edge exchangeable cutting tool to which the cutting insert is detachably attached.
  • Patent Document 1 includes a substantially hexagonal plate-like insert body having three main corners and sub-corners alternately on the upper and lower surfaces, and includes three main corners on the upper surface. Among them, in order from the first main corner to the two adjacent sub-corners, the corner blade, the linear sub-cutting blade that inclines toward the lower surface as it moves away from the corner blade, and the sub-cutting blade as it moves away from the sub-cutting blade A so-called unintentional cutting insert in which the main cutting edge inclined toward the lower surface at a large angle is formed, and the portions extending from the first main corner toward two adjacent sub-corners are the same shape. ing.
  • the cutting insert described in Patent Document 1 is projected on the outer peripheral side of the tip end of the tool body while the corner blade is projected to the insert mounting seat formed at the tip end portion of the tool body rotated about the axis.
  • Cutting by mounting one set of secondary cutting edge and main cutting edge connected to the corner blade on the outer peripheral side of the tool body, and mounting the other set of secondary cutting edge and main cutting edge on the tip side of the tool body Since the secondary cutting edge located on the outer peripheral side of the tool body is linear, the chips generated by the secondary cutting edge are not easily curled in a string shape, and the upper surface, which is the secondary rake face, extends slightly. It will flow out.
  • the present invention is made under such a background, and controls the discharge of chips generated by a cutting blade located on the outer peripheral side of the tool body, so that the chip of the insert body and the head of the clamp screw It is an object of the present invention to provide a cutting insert capable of preventing a work material from rubbing on a processing wall, and a cutting edge exchange type cutting tool to which the cutting insert is detachably attached.
  • the cutting insert of the present invention includes first and second polygonal surfaces facing each other and the first and second polygonal surfaces.
  • a polygonal plate-like insert body having a side surface disposed around the first polygonal surface, and the first corner portion of the first polygonal surface has a first polygonal surface.
  • a corner blade having a corner rake surface is formed, and a main blade connected to the corner rake surface extends from the corner blade to a second corner portion adjacent to the first corner portion in the circumferential direction of the first polygonal surface.
  • a main cutting edge having a rake face on the first polygonal surface is formed, and on the side opposite to the side where the main cutting edge extends from the corner blade in the circumferential direction of the first polygonal surface,
  • the secondary rake face connected to the corner rake face is defined as the first polygonal face.
  • a secondary cutting edge is formed, and a portion of the corner blade on the side of the main cutting edge is drawn with a concave curve that is recessed toward the second polygonal surface toward the main cutting edge.
  • a corner blade concave curve portion extending toward the polygonal surface side is formed.
  • the cutting edge replaceable cutting tool of the present invention has an insert mounting seat formed on an outer periphery of a tip portion of a tool body rotated about an axis, the cutting insert having the above-described configuration, and the corner blade and the outer periphery of the tip end of the tool body.
  • the main cutting edge connected to the corner blade is positioned on the outer peripheral side of the tool body, and the auxiliary cutting edge is positioned on the tip side of the tool body, and the corner blade, the main cutting edge, and
  • the corner rake face, the main rake face, and the auxiliary rake face connected to the auxiliary cutting edge are detachably attached to the tool rotating direction.
  • a 2nd polygonal surface is provided in the main cutting blade side part turned to the tool main body outer peripheral side of the corner blade protruded to the front-end
  • a corner blade concave curve portion extending toward the second polygonal surface side while forming a concave curve recessed toward the side is formed. Therefore, the tool main body front end side part of the chip
  • the chip generated by the concave curved corner portion thus forming a concave curved shape is curled with a small radius and curled with a small radius when its tip is bent into a concave curved cross section, and the main rake face It is controlled so as to extend toward the second corner portion in a string form along the main rake face and to be discharged from the bent second corner portion. For this reason, even if there is another first corner portion in which a corner blade is formed on the first polygonal surface, the chips collide with other unused first corner portions and the insert body is damaged. In addition, it is possible to avoid scraping of chips on the head of the clamp screw and the work wall surface of the work material.
  • a convex curved surface portion that is convex on the side opposite to the second polygonal surface in the direction along the secondary cutting edge is formed on the secondary rake face inside the concave curved portion of the corner blade.
  • the insert body has a rotationally symmetric shape by 120 ° around the insert center line passing through the centers of the first and second polygonal surfaces, and is reversely symmetric with respect to the first and second polygonal surfaces.
  • Each of the first and second polygonal surfaces has three first and second corner portions alternately arranged in the circumferential direction, and the insert center line is formed in a hexagonal plate shape.
  • the first and second polygonal surfaces are arranged opposite to each other in the direction, and the main cutting edge and the auxiliary cutting edge extend in opposite directions in the circumferential direction of the insert body from the corner blade.
  • the side surface of the insert body is formed so as to extend in parallel to the insert center line, and if it is a negative type cutting insert, the edge angle of the corner blade, the main cutting edge, and the auxiliary cutting edge is ensured and the cutting edge is secured. Strength can be improved.
  • the insert body is formed in a rotationally symmetric shape by 120 ° around the insert centerline as described above, and is formed in a hexagonal plate shape that is symmetrical with respect to the first and second polygonal surfaces.
  • the main cutting edge and the auxiliary cutting edge extend toward opposite polygonal surfaces as they are separated from the corner cutting edge, and the main cutting edge and the auxiliary cutting edge adjacent to each other in the circumferential direction are the second cutting edge. It is formed so as to be connected at the corner portion, and the corner blade is formed at the first corner portion from the position where the main cutting edge and the auxiliary cutting edge are most recessed in the insert center line direction at the second corner portion.
  • the amount of step height h in the insert centerline direction to the position protruding most in the insert centerline direction is set.
  • the auxiliary cutting edge is directed in a direction away from the corner edge.
  • a straight-lined Saray blade that touches the corner blade or a convex curve-shaped Saray blade that is convex in the insert centerline direction, and a secondary cutting edge convex that draws a convex curve that touches the Saray blade and protrudes in the insert centerline direction A curved portion and a secondary cutting edge concave curved portion that draws a concave curve in contact with the secondary cutting edge convex curved portion and that is concave in the insert center line direction may be provided.
  • the machining bottom surface of the work material can be finished smoothly by the above-mentioned salai blade of the secondary cutting edge located on the tip side of the tool body, and in particular the ramping by the concave curved portion of the secondary cutting edge that is concave in the insert center line direction It is possible to secure the escape amount of the secondary cutting edge with respect to the processing bottom surface during processing.
  • the secondary cutting edge is further arranged in order in a direction away from the corner blade, in order, a linear secondary cutting edge linear portion that contacts the secondary cutting edge concave curved portion, and the secondary cutting blade linear portion. You may provide the connection part which draws the concave curve which touches and is concave in the said insert centerline direction, and is connected to the said adjacent main cutting blade.
  • the secondary cutting edge has a secondary relief surface on the side surface of the insert body that intersects the secondary rake surface, and when viewed from a direction perpendicular to the secondary relief surface, the corner blade and the A straight line connecting the contact point with the Saray blade and the position where the auxiliary cutting edge is most recessed in the insert center line direction forms an angle larger than 14 ° with respect to a plane perpendicular to the insert center line direction. Also, it is possible to secure the escape amount of the secondary cutting edge with respect to the processing bottom surface during the ramping process.
  • the secondary flank is arranged around the first polygonal surface.
  • the sub-cutting blade is the first of the plurality of sub-flank surfaces that is closest to the first corner portion side. It is formed at the crossing ridge line part of the auxiliary flank part and the auxiliary rake face, and the auxiliary flank part on the second corner part side of the first auxiliary flank part is obtuse with respect to the machining surface formed by the auxiliary cutting edge. It will be bent and retreat. For this reason, it is possible to suppress an increase in cutting resistance due to an increase in the back component force by reducing the wear width of the auxiliary flank.
  • the second auxiliary flank face portion of the plurality of auxiliary flank face portions that intersects the first auxiliary flank face portion with the first auxiliary flank portion closest to the first corner portion If the angle formed with respect to the extended surface toward the first corner portion is too small, the above effect may not be obtained. On the other hand, if the angle is too large, for example, as described above, the insert body May be difficult to form in a hexagonal plate shape that is symmetrical with respect to the first and second polygonal surfaces. For this reason, it is desirable that the angle is in the range of 0.5 ° to 2.5 °.
  • the present invention it is possible to control string-wound chips so that the inside of the main rake face is discharged from the second corner portion along the main rake face. Prevents chips from colliding with the corner of 1 and prevents the insert body from being damaged, thereby extending the insert life. Also, it is necessary to replace the clamp screw early by scraping the head and wearing it. It is also possible to prevent chips from rubbing on the processed wall surface of the work material and damaging the processed surface roughness.
  • FIG. 1 It is a perspective view which shows 1st Embodiment of the cutting insert of this invention.
  • A The perspective view which looked at the embodiment shown in FIG. 1 from another angle
  • (b) It is the enlarged view of the A section in FIG. It is the top view which looked at embodiment shown in FIG. 1 from the insert centerline direction.
  • (A) It is a side view of the arrow X direction view in FIG. 3,
  • (b) It is an enlarged view of A part in FIG. (A).
  • 4A is a partial sectional view of aa in FIG. 3, and FIG. 4B is an enlarged view of a portion A in FIG.
  • FIG. 16 is a side view of the embodiment shown in FIG. 15.
  • FIG. 16 is an enlarged side view showing one cutting insert attached to the embodiment shown in FIG. 15.
  • FIG. 16 is an enlarged perspective view showing one cutting insert attached to the embodiment shown in FIG. 15. It is the perspective view seen from the axial direction front end side which shows the tool main body of embodiment shown in FIG. 15 in the state which removed the cutting insert. It is a perspective view which shows one insert mounting seat of the tool main body shown in FIG. (A) The top view seen from the insert center line direction which shows the state by which chip
  • FIGS. 1 to 14 show a first embodiment of the cutting insert of the present invention
  • FIGS. 15 to 21 show an embodiment of the cutting edge-exchangeable cutting tool of the present invention
  • generated by the cutting insert of the said embodiment is shown.
  • the cutting insert of the present embodiment has an insert body 1 formed of a hard material such as cemented carbide in the form of an eccentric hexagonal plate, and has two hexagonal surfaces (first and second polygons) facing each other. Surface) 2 and side surfaces 3 arranged around these hexagonal surfaces 2.
  • a mounting hole 4 having a circular cross section passing through the insert body 1 is opened, and the insert body 1 is 120 ° around the insert center line C passing through the center of the mounting hole 4.
  • Each has a rotationally symmetric shape, and is a reversely symmetric shape with respect to the two hexagonal surfaces 2.
  • the periphery of the opening in the hexagonal surface 2 of the mounting hole 4 is a plane portion 2a perpendicular to the annular insert center line C. Further, the lengths of the sides of the hexagonal surface 2 when viewed from the direction of the insert center line C are substantially equal.
  • Each of the six corner portions of the two hexagonal surfaces 2 is alternately formed as a first corner portion C1 and a second corner portion C2 in the circumferential direction of the hexagonal surface 2, and in the first corner portion C1
  • the included angle of the two side ridges of the intersecting hexagonal surface 2 is smaller than the included angle of the two side ridges of the hexagonal surface 2 intersecting at the second corner portion C2, and is therefore smaller than 120 °. It is set to approximately 90 °.
  • the first corner portion C1 of the other hexagonal surface 2 is located on the opposite side of the first corner portion C1 in the direction of the insert center line C1 in one hexagonal surface
  • the second corner portion C2 of the other hexagonal surface 2 is located on the opposite side of the second corner portion C2 of the hexagonal surface 2 in the direction of the insert center line C.
  • a corner blade 5 having a corner rake face 5a on each hexagonal face 2 and having a convex curve shape such as a convex arc when viewed from the direction of the insert center line C is formed. Further, from the corner blade 5 to the second corner portion C2 adjacent to one side (counterclockwise direction side in FIG.
  • the corner blade 5 to the main cutting edge 6 and the sub-cutting edge between these two hexagonal surfaces 2. 7 extends in the opposite direction to the circumferential direction of the insert body 1. That is, for one side surface 3, the main cutting edge 6 is formed at the intersection ridge line portion with one hexagonal surface 2, and the sub cutting edge 7 is formed at the intersection ridge line portion with the other hexagonal surface 2. .
  • the side surface 3 is parallel to the insert center line C, and the intersecting ridge line portion between the side surfaces 3 adjacent to each other in the circumferential direction in the first corner portion C1 is formed in a convex curved surface, and the corner relief surface of the corner blade 5
  • the portion between the first and second corner portions C1 and C2 is formed in a flat shape, and the main flank of the main cutting edge 6 and the auxiliary flank of the sub cutting edge 7 on the front and back hexagonal surfaces 2 are formed. It is said. That is, the cutting insert of this embodiment is a negative type cutting insert.
  • the main cutting edge 6 has a convex curve shape that is convex in the direction of the insert center C line, or a straight line, or a shape in which the convex curve and the straight line are smoothly continuous when viewed from the direction facing the side surface 3 that is the flank. As the distance from the corner blade 5 increases, the second hexagonal surface 2 is inclined so as to recede to the second corner portion C2.
  • the secondary cutting edge 7 is arranged in the direction of the straight line or the insert center line C in contact with the corner blade 5 in order toward the direction away from the corner blade 5 when viewed from the direction facing the side surface 3 which is also the flank.
  • the secondary cutting edge 7 includes a linear secondary cutting edge linear portion 7D that is in contact with the secondary cutting edge concave curved portion 7C, and a concave portion in the direction of the insert center line C that is in contact with the secondary cutting blade linear portion 7D.
  • the connecting part 7E connected to the adjacent main cutting edge 6 in the 2nd corner part C2 is provided, drawing the concave curve which becomes. Accordingly, the bottom of the concave curve formed by the connecting portion 7E is a position P that is most concave in the direction of the insert center line C in the auxiliary cutting edge 7 of the hexagonal surface 2 in this embodiment.
  • the corner blade 5 has a concave curve that is recessed toward the opposite hexagonal surface 2 in the direction of the insert center line C toward the main cutting edge 6 on the main cutting edge 6 side.
  • a corner blade concave curved portion 5A extending toward the second side is formed.
  • the opposite hexagonal surface 2 is drawn while forming a concave curve recessed on the opposite hexagonal surface 2 side.
  • the concave curved portion extending toward the side may be formed so as to be smoothly continuous with the corner blade concave curved portion 5A.
  • a blade convex curve portion 5B is formed, and the corner blade convex curve portion 5B is smoothly continuous so as to be in contact with the salai blade 7A of the sub-cutting blade 7.
  • the corner blade 5 and the salai blade 7A Is the position Q that protrudes most in the direction of the insert center line C on the hexagonal surface 2.
  • the boundary (contact point) between the corner blade concave curve portion 5A and the corner blade convex curve portion 5B is located, for example, on the bisector of the first corner portion C1.
  • the main cutting edge 6 and the auxiliary cutting edge 7 are most recessed in the direction of the insert center line C in the second corner portion C2 (in this embodiment, the bottom of the connecting portion 7E of the auxiliary cutting edge 7).
  • the distance in the insert center line C direction from P to the position Q at which the corner blade 5 protrudes most in the direction of the insert center line C in the first corner portion C1 (in this embodiment, a contact point with the Sarai blade 7A)
  • the amount h and the interval in the insert center line C direction between the positions Q protruding most in the insert center line C direction of the corner blades 5 of the both hexagonal surfaces 2 in the first corner portion C1 is defined as the total cutting edge height H.
  • h / H 0.28.
  • the contact point with the Saray blade 7A which is the position Q where the corner blade 5 protrudes most in the insert center line C direction
  • the straight line L connecting the sub-cutting blade 7 with the most recessed position P in the insert center line C direction is set to form an angle ⁇ larger than 14 ° with respect to a plane perpendicular to the insert center line C direction.
  • the corner rake face 5a, the main rake face 6a, and the auxiliary rake face 7a have lands on the corner blade 5, the main cutting edge 6 and the auxiliary cutting edge 7, respectively.
  • the secondary cutting edge 7 is directed to the inside of the hexagonal surface 2, the second direction toward the opposite hexagonal surface 2 side in the direction of the insert centerline C with a substantially constant inclination with respect to the plane perpendicular to the insert centerline C.
  • the first rake face has a second rake face that faces the opposite hexagonal face 2 side at a larger inclination angle with respect to a plane perpendicular to the insert center line C than the first rake face.
  • the minor rake face 7a is convex on the opposite side to the opposite hexagonal face 2 in the direction along the minor cutting edge 7, as shown in FIG.
  • a convex curved surface portion 7b is formed inside the corner blade concave curved portion 5A of the corner blade 5 to which the auxiliary cutting blade 7 is continuous.
  • Such a cutting insert is attachable to and detachable from the insert mounting seat 12 formed on the outer periphery of the tip end of the tool body 11 rotated in the tool rotation direction T around the axis O as shown in FIGS. And a set of corner blades 5, a main cutting edge 6, and a sub cutting edge 7 are used for cutting.
  • the tool body 11 is formed in a substantially disk shape with the axis O as the center, and a tip pocket 14 extending toward the rear end is formed on the outer periphery of the tip, and the insert mounting seat 12 is The tip pocket 14 is formed in the wall surface facing the tool rotation direction T as a recess that opens to the wall surface and the tip and outer peripheral surfaces of the tool body 11.
  • a plurality (seven) of chip pockets 14 and insert mounting seats 12 are formed at equal intervals in the circumferential direction.
  • the insert mounting seat 12 has an annular flat bottom surface 12 a facing the tool rotation direction T, and an outer periphery of the tip of the tool body 11 that rises perpendicularly to the bottom surface 12 a on the tool rotation direction T side. And a wall surface 12c facing the inner peripheral side of the tip.
  • the bottom surface 12a is inclined slightly toward the tool rotation direction T as it goes toward the rear end side of the tool body 11, and a screw hole 12d into which the clamp screw 13 is screwed is formed at the center. Further, relief portions that prevent interference with the insert body 1 are formed between the bottom surface 12a and the wall surfaces 12b and 12c, and at the intersection ridge line portion between the tip surface and the outer peripheral surface of the tool body 11 and the bottom surface 12a.
  • the cutting insert of the above embodiment has one hexagonal surface 2 of the insert body 1 directed in the tool rotation direction T, and one corner blade 5 of the one hexagonal surface 2 is placed. While projecting to the outer peripheral side of the front end of the tool body 11, the main cutting edge 6 connected to the corner blade 5 is directed toward the outer peripheral side of the tool body 11 so as to extend to the side opposite to the tool rotation direction T. Further, the sub-cutting blade 7 connected to the corner blade 5 is seated so as to face the rear end side slightly toward the inner peripheral side toward the tip end side of the tool body 11.
  • the Sarai blade 7A of the sub-cutting blade 7 is substantially positioned on a plane perpendicular to the axis O of the tool body 11, and the insert center line C is moved to the opposite side of the tool rotation direction T and the rear of the tool body 11 is moved. It is arranged slightly inclined so as to go to the end side.
  • the hexagonal surface 2 opposite to the one hexagonal surface 2 of the insert main body 1 is such that the flat portion 2a at the center thereof is in close contact with the bottom surface 12a of the insert mounting seat 12, and further the tip end side of the tool main body 11
  • the wall surface between these wall surfaces 12b and 12c does not contact the insert main body 1 seated in this way, and a slight space is provided between the opposing side surfaces 3.
  • the insert main body 1 is pressed against the bottom surface 12a and the two side surfaces 3 are pressed against the wall surfaces 12b and 12c. And fixed to the insert mounting seat 12 and attached to the tool body 11.
  • the main cutting edge 6 side portion of the corner blade 5 that is projected to the outer periphery side of the tool body 11 is directed to the outer periphery side of the tool body 11.
  • the chip generated by such a concave curved corner blade concave curved portion 5A is bent in a concave curved shape in the same manner in a cross section whose tip side portion is orthogonal to the generation direction, and stress In response to this, as shown in FIG. Then, the chips curled in this manner extend in the form of a coil winding from the inner side of the main rake face 6a along the main rake face 6a toward the rear end side of the tool body 11, that is, the second corner part C2. 2 is controlled so as to be discharged from the second corner portion C2 bent at an obtuse angle as viewed from the direction opposite to 2.
  • tip outer peripheral part of the tool main body 11, and the main cutting blade 6 connected to this is the other 1st corner of the hexagonal surface 2 in which the tool rotation direction T was orientated. It can avoid colliding with the unused corner blade 5 etc. in the part C1, and it can prevent that a defect
  • the chip flows out along the main rake face 6a inside the main rake face 6a as described above, the work material formed by the clamp screw 13 for fixing the insert body, the corner blade 5 and the main cutting edge 6 is used. The processing wall surface is not rubbed, the head wear of the clamp screw 13 does not require early replacement, and the processing surface roughness is not impaired.
  • the auxiliary rake face 7a of the auxiliary cutting edge 7 connected to the corner edge 5 is convex in the direction of the insert center line C in the direction along the auxiliary cutting edge 7, that is, the opposite hexagonal shape.
  • a convex curved surface portion 7b that is convex on the side opposite to the surface 2 is formed inside the corner blade concave curved portion 5A, and the chips curled with a small radius as described above are formed on the convex curved surface portion 7b.
  • the corner blades are in sliding contact with the concave curved portion 5A side.
  • the discharge is controlled so as to be curled to a smaller radius and extend in a string shape, so that the insert body 1 is more reliably connected. Defects, wear of the clamp screw 13 and deterioration of the machined surface roughness can be prevented.
  • the insert main body 1 of the present embodiment has a rotationally symmetric shape by 120 ° around the insert center line C passing through the centers of the two hexagonal surfaces, and the six hexagonal surfaces 2 have a reverse-inverted symmetrical shape. It is formed in the shape of a square plate, and the hexagonal surface 2 has three first and second corner portions C1 and C2 arranged alternately in the circumferential direction and opposite to each other in the direction of the insert center line C. In these two hexagonal surfaces 2, the main cutting edge 6 and the auxiliary cutting edge 7 are formed so as to extend from the corner blade 5 in opposite directions in the circumferential direction of the insert body 1. For this reason, it becomes possible to use three sets of the corner blades 5, the main cutting blade 6, and the auxiliary cutting blade 7 of the hexagonal surface 2 on the front and back with one insert body 1, which is efficient and economical. .
  • the cutting insert of the present embodiment is a negative type cutting in which the side surface 3 of the insert body 1 serving as a flank surface of the corner blade 5, the main cutting blade 6 and the auxiliary cutting blade 7 extends in parallel to the insert center line C. It is an insert. For this reason, the cutting edge angle
  • the main cutting edge 6 and the auxiliary cutting edge 7 extend toward the opposite hexagonal surface 2 as they are separated from the corner cutting edge 5, and the main cutting edge 6 and the auxiliary cutting edge that are adjacent to each other in the circumferential direction.
  • the cutting edge 7 is connected to the connecting portion 7E at the second corner portion C2, and the connecting portion 7E at the second corner portion is recessed most in the direction of the insert center line C at the main cutting edge 6 and the auxiliary cutting edge 7.
  • the position P is formed. For this reason, as described above, chips extending along the main rake face 6a on the inner side of the main rake face 6a can be more easily discharged from the second corner portion C2 which is the most recessed position P.
  • the corner blade 5 is formed in the first corner portion C1 from the position P where the main cutting edge 6 and the sub-cutting blade 7 are most recessed in the insert center line C direction in the second corner portion C2.
  • the edge step height h in the insert center line C direction up to the position Q that protrudes most in the insert center line C direction is the largest in the insert center line C direction of the corner blades 5 of the two hexagonal surfaces 2 in the first corner portion C1.
  • H which is the distance between the protruding positions Q in the insert center line C direction, h / H> 0.21.
  • the above-mentioned cutting edge level difference h which is the height of the corner blade 5 on each hexagonal surface 2, has a large proportion of the total cutting edge height H, which is the thickness of the insert body 1. Since the height to the terminal end of 6 is large, the insert body 1 is inclined so that the insert center line C is slightly inclined toward the rear end side of the tool body 11 as it goes to the side opposite to the tool rotation direction T as described above. Even if it is attached to the insert mounting seat 12, the main cutting edge 6 extends to the side opposite to the tool rotation direction T as it goes to the rear end side of the tool body 11, and the axial rake angle is a positive angle. It is possible to control so that chips are reliably discharged from the second corner portion C2.
  • the cutting edge level difference h to a relatively large ratio of h / H> 0.21 with respect to the total cutting edge height H, the corners of the auxiliary cutting edge 7 directed toward the tip side of the tool body 11 are reduced.
  • the amount of depression from the blade 5 to the most depressed position P of the connecting portion 7E increases. For this reason, if the clearance angle of the side surface 3 serving as the flank face of the auxiliary cutting edge 7 is the same, the escape amount of the auxiliary cutting edge 7 can be secured larger than that of a cutting insert having a small h / H.
  • the straight line L connecting the position P can also be obtained by setting an angle ⁇ larger than 14 ° with respect to a plane perpendicular to the insert center line C direction.
  • the cutting edge level difference h is h / H ⁇ 0.21 with respect to the total cutting edge height H, or the angle ⁇ is less than 14 °, these effects may not be obtained.
  • the cutting edge level difference h is h / H> 0.23 with respect to the total cutting edge height H, and h / H> 0.25. Is more desirable. However, if h / H becomes too large, the thickness of the insert body 1 between the two hexagonal surfaces 2 becomes too thin, and the insert body 1 is liable to be lost due to insufficient strength, so h / H ⁇ 0.33. It is desirable that
  • the auxiliary cutting edge 7 is provided with a salai blade 7A having a linear shape in contact with the corner blade 5 or a convex curve shape convex in the direction of the insert center line C, and the tool body 11 is attached to the axis O.
  • the bottom surface of the machining can be finished smoothly by the Saray blade 7A.
  • a convex curved portion 7B having a convex curve that is convex in the direction of the insert center line C is continuous, and the ramping process and the plunging process are performed. In this case, cutting can be performed using the sub cutting edge convex curved portion 7B.
  • a curved portion 7C is formed, and the secondary cutting edge concave curved portion 7C has a secondary cutting edge as viewed from the direction perpendicular to the side surface 3 as compared with the Sarai blade 7A and the secondary cutting edge convex curved portion 7B.
  • the secondary cutting edge 7 is further in contact with the secondary cutting edge concave curve portion 7C, and the linear secondary cutting edge linear portion 7D is in contact with the secondary cutting edge linear portion 7D.
  • a connecting portion 7E connected to the adjacent main cutting edge 6 while drawing a concave curve that is concave in the direction of the line O, and connected to the sub cutting edge concave curved portion 7C by the sub cutting edge linear portion 7D.
  • the cutting edge strength of the auxiliary cutting edge 7 between the part 7E is ensured.
  • the portion of the secondary cutting edge linear portion 7D may be a concave curved shape in which the secondary cutting edge concave curved portion 7C and the connecting portion 7E are extended and continuous.
  • the present invention is applied to a negative type cutting insert in which the side surface 3 of the insert body 1 is parallel to the insert center line C as described above is described.
  • the present invention is applied to a positive type cutting insert. Is also possible.
  • FIG. 23 to FIG. 29 show a second embodiment of the cutting insert of the present invention, and the same reference numerals are assigned to the parts common to the first embodiment shown in FIG. 1 to FIG. Therefore, the description is omitted.
  • the auxiliary cutting edge 7 has an auxiliary flank on the side surface 3 of the insert body 1 intersecting the auxiliary rake face 7a as in the first embodiment.
  • the side surface 3 of the insert body 1 that is the secondary flank is formed in a flat shape between the first and second corner portions C1 and C2, whereas the side flank is the secondary flank.
  • the side surface 3 is provided with a plurality of (two) sub-flank portions 3a and 3b that bend so as to intersect an obtuse angle in the circumferential direction of the hexagonal surface 2 that is the first polygonal surface.
  • the side surface 3 serving as a secondary flank has a narrow circumferential width in order from the first corner portion C1 side of the hexagonal surface 2 on which the secondary cutting edge 7 is formed.
  • a planar first sub-flank 3a and a flat second sub-flank 3b having a circumferential width wider than that of the first sub-flank 3a are formed.
  • the two auxiliary flank portions 3a and 3b intersect at an obtuse angle in the circumferential direction.
  • the angle ⁇ formed with respect to the extended surface S toward the C1 side is in the range of 0.5 ° to 2.5 ° in this embodiment, and is particularly 1.5 °.
  • the intersecting ridge line portion between the second sub-flank surface portion 3b and the sub-rake surface 7a is the intersecting ridge line portion between the first sub-flank surface portion 3a and the sub-rake surface 7a.
  • the extension line toward the second corner portion C ⁇ b> 2 the line moves backward so as to gradually move away from the corner blade 5.
  • the auxiliary cutting edge 7 formed at the intersecting ridge line portion between the first auxiliary flank face portion 3a and the auxiliary rake face 7a is used as the above-mentioned salai blade 7A on a plane perpendicular to the axis O of the tool body 11 as described above.
  • the intersecting ridge line portion of the second auxiliary flank surface portion 3b and the auxiliary rake surface 7a is bent at an obtuse angle with respect to the plane perpendicular to the axis O, that is, the machining surface of the work material by the salai blade 7A. 2 toward the rear end side in the direction of the axis O as it goes toward the corner C2.
  • variety wears the minor cutting edge 7 by cutting. 7A portion can be suppressed, the wear width can be prevented from increasing, the increase in the back force due to the increase in the wear width is suppressed, the increase in cutting resistance is suppressed, and stable cutting is performed. It becomes possible.
  • tip to which the cutting insert of this 1st Embodiment is attached It is possible to attach the cutting insert of the second embodiment as it is to the insert mounting seat 12 formed in the tool body 11 of the exchangeable cutting tool.
  • the first sub-flank portion 3a closest to the first corner portion C1 among the plurality of sub-flank portions 3a, 3b is the first sub-flank portion. If the angle ⁇ formed with respect to the extended surface S of the second sub-flank surface portion 3b intersecting the surface portion 3a toward the first corner portion C1 is too small, the first and second sub-flank surface portions 3a and 3b are There is a possibility that the wear width cannot be reduced due to being close to one plane, and the above-described effect cannot be obtained.
  • the angle ⁇ be in the range of 0.5 ° to 2.5 °.
  • the control is performed so that the chord wound chips are discharged from the second corner portion along the main rake face inside the main rake face. It is possible to prevent the chip from colliding with the unused first corner and to prevent the insert body from being damaged, thereby prolonging the insert life. It is also possible to prevent the screw from being replaced at an early stage or the surface roughness of the machined surface from being damaged due to chips scraping on the machined wall of the work material. Therefore, industrial use is possible.
  • Insert body 2 Hexagonal surface (first and second polygonal surfaces) 3 side face 3a first auxiliary flank face part 3b second auxiliary flank face part 4 mounting hole 5 corner blade 5a corner rake face 5A corner blade concave curve part 5B corner blade convex curve part 6 main cutting edge 6a main rake face 7 auxiliary Cutting edge 7a Secondary rake face 7b Convex curved surface part 7A Saray blade 7B Secondary cutting edge convex curved part 7C Secondary cutting edge concave curved part 7D Secondary cutting edge linear part 7D 7E Connecting portion 11 Tool body 12 Insert mounting seat 13 Clamp screw C Insert center line C1 First corner portion C2 Second corner portion P In the second corner portion C2, the main cutting edge 6 and the auxiliary cutting edge 7 are the insert centerline.
  • the most recessed position in the C direction Q The position in which the corner blade 5 protrudes the most in the direction of the insert center line C in the first corner portion C1 h Cutting edge step height H Total cutting edge height L
  • an angle formed by the straight line L with respect to a plane perpendicular to the direction of the insert center line C, as viewed from the direction perpendicular to 3 (sub-flank), the first sub-flank 3 a is To the first corner C1 side Axis T tool rotation direction of the angle O tool body 11 makes with the long surface S

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

Abstract

L'invention permet de réguler l'évacuation de copeaux et d'empêcher la perte d'un corps d'insert et le raclage contre la tête d'une vis de serrage ou une surface de paroi usinée d'un matériau de travail. La présente invention comprend un corps d'insert en forme de plaque polygonale (1) pourvu de première et deuxième surfaces polygonales (2) dos à dos et d'une surface latérale (3) disposée sur le périmètre des première et deuxième surfaces polygonales (2). Un bord de coin (5) est formé dans une première partie coin (C1) des parties coins de la première surface polygonale (2). Un bord de coupe principal (6) est formé du bord de coin (5) à une deuxième partie coin (C2) adjacente à la première partie coin (C1) dans le sens circonférentiel de la première surface polygonale (2). Un bord de coupe secondaire (7) est formé sur le côté opposé au côté où le bord de coupe principal (6) s'étend dans le sens circonférentiel de la première surface polygonale (2) à partir du bord de coin (5). Une partie du bord de coin (5) sur le côté bord de coupe principal (6) comporte une partie courbe concave de bord de coin (5A) s'étendant vers la deuxième surface polygonale (2) tout en traçant une courbe concave qui est graduellement renfoncée sur le côté deuxième surface polygonale (6) en allant vers le bord de coupe principal (6).
PCT/JP2017/007820 2016-03-03 2017-02-28 Insert de coupe et outil de coupe à bord remplaçable Ceased WO2017150541A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2016041540 2016-03-03
JP2016-041540 2016-03-03
JP2016-171161 2016-09-01
JP2016171161A JP2017159440A (ja) 2016-03-03 2016-09-01 切削インサートおよび刃先交換式切削工具

Publications (1)

Publication Number Publication Date
WO2017150541A1 true WO2017150541A1 (fr) 2017-09-08

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112543688A (zh) * 2018-08-30 2021-03-23 三菱综合材料株式会社 切削刀片及可转位刀片式切削工具
CN113664270A (zh) * 2021-09-07 2021-11-19 株洲华锐精密工具股份有限公司 一种切削刀片及切削刀具

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003103407A (ja) * 2001-09-28 2003-04-08 Kyocera Corp 切削インサート
WO2011105420A1 (fr) * 2010-02-24 2011-09-01 京セラ株式会社 Outil de coupe

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003103407A (ja) * 2001-09-28 2003-04-08 Kyocera Corp 切削インサート
WO2011105420A1 (fr) * 2010-02-24 2011-09-01 京セラ株式会社 Outil de coupe

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112543688A (zh) * 2018-08-30 2021-03-23 三菱综合材料株式会社 切削刀片及可转位刀片式切削工具
EP3845338A4 (fr) * 2018-08-30 2022-06-08 Mitsubishi Materials Corporation Plaquette de coupe et outil de coupe du type à remplacement de bord de coupe
CN113664270A (zh) * 2021-09-07 2021-11-19 株洲华锐精密工具股份有限公司 一种切削刀片及切削刀具

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