WO2015016144A1 - Milling cutter insert and exchangeable tool edge milling cutter - Google Patents

Milling cutter insert and exchangeable tool edge milling cutter Download PDF

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Publication number
WO2015016144A1
WO2015016144A1 PCT/JP2014/069679 JP2014069679W WO2015016144A1 WO 2015016144 A1 WO2015016144 A1 WO 2015016144A1 JP 2014069679 W JP2014069679 W JP 2014069679W WO 2015016144 A1 WO2015016144 A1 WO 2015016144A1
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WO
WIPO (PCT)
Prior art keywords
insert
milling
mounting seat
tool
polygonal surface
Prior art date
Application number
PCT/JP2014/069679
Other languages
French (fr)
Japanese (ja)
Inventor
孝之 熊切
Original Assignee
三菱マテリアル株式会社
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 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 WO2015016144A1 publication Critical patent/WO2015016144A1/en

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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
    • 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
    • B23C5/22—Securing arrangements for bits or teeth or cutting inserts
    • B23C5/2204—Securing arrangements for bits or teeth or cutting inserts with cutting inserts clamped against the walls of the recess in the cutter body by a clamping member acting upon the wall of a hole in the insert
    • B23C5/2226—Securing arrangements for bits or teeth or cutting inserts with cutting inserts clamped against the walls of the recess in the cutter body by a clamping member acting upon the wall of a hole in the insert for plate-like cutting inserts fitted on an intermediate carrier, e.g. shank fixed in the cutter body
    • 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
    • B23C5/22—Securing arrangements for bits or teeth or cutting inserts
    • B23C5/24—Securing arrangements for bits or teeth or cutting inserts adjustable
    • 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
    • B23C5/22—Securing arrangements for bits or teeth or cutting inserts
    • B23C5/24—Securing arrangements for bits or teeth or cutting inserts adjustable
    • B23C5/2472—Securing arrangements for bits or teeth or cutting inserts adjustable the adjusting means being screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2226/00—Materials of tools or workpieces not comprising a metal
    • B23C2226/12—Boron nitride
    • B23C2226/125—Boron nitride cubic [CBN]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2226/00—Materials of tools or workpieces not comprising a metal
    • B23C2226/31—Diamond
    • B23C2226/315—Diamond polycrystalline [PCD]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2240/00—Details of connections of tools or workpieces
    • B23C2240/08—Brazed connections

Definitions

  • the present invention relates to a milling insert that is removably attached to an insert mounting seat formed on the outer periphery of a tool body tip of a blade-tip-exchangeable mill that is rotated about an axis, and a blade tip to which the milling insert is detachably attached. It relates to replaceable milling.
  • the tool body is also made of aluminum or an aluminum alloy to reduce the weight, and that the tool body is rotated at a cutting speed of about 4000 to 5000 m / min.
  • An object of the present invention is to provide a milling insert capable of preventing damage to a chip pocket due to chips generated in machining, and a blade-tip-exchangeable milling device to which such a milling insert is detachably attached.
  • the insert for milling of the present invention is attached to and detached from an insert mounting seat formed on the outer periphery of the tool body tip of a blade-type replaceable milling cutter rotated around an axis.
  • An insert for milling that can be attached comprising a polygonal plate-like insert body, and a corner portion of the polygonal surface of the insert body provided with a cutting edge portion having a rake face on the polygonal surface.
  • the bank-shaped portion protruding from the polygonal surface is from the direction facing the polygonal surface. It is formed so as to extend in a direction intersecting with two side ridge portions of the polygonal surface intersecting the corner portion as seen.
  • the cutting edge replaceable milling cutter according to the present invention is a cutting edge replaceable milling cutter in which the insert for milling according to the present invention is detachably mounted on an insert mounting seat formed on the outer periphery of the tip end of a tool body rotated around an axis.
  • a tip pocket that opens to the tool rotation direction side of the insert mounting seat is formed on the outer periphery of the tip end portion of the tool body, and the insert mounting seat faces the rear side in the tool rotation direction.
  • a mounting seat wall facing the polygonal surface of the main body, and the insert for milling projects the corner portion to the outer peripheral side of the tip of the tool main body and directs the rake face of the cutting edge portion in the tool rotation direction.
  • the bank-shaped part is attached so as to extend along the crossing ridge line part between the bottom surface of the chip pocket and the wall surface of the mounting seat. That.
  • the cutting edge generated by the cutting edge portion provided at the corner protruding from the outer periphery of the tool body of the milling insert is inserted into the insert body. It flows out while rubbing the rake face of the cutting edge portion provided on the polygonal surface. Then, at the position facing the corner portion of the polygonal surface with the rake face of the cutting edge in between, the bank-shaped portion protruding from the polygonal surface is seen from the direction facing the polygonal surface and the corner It extends in the direction intersecting the two edge parts of the polygonal surface intersecting the part, that is, the cutting edge of the cutting edge part.
  • the chips will not protrude from the polygonal surface. It is discharged in such a way that it rides on the ridge or is guided in the direction in which the ridge extends along the ridge. Therefore, the chips are discharged at a distance from the bottom surface of the chip pocket, which is located on the inner peripheral side of the tool body of the bank-like portion, and are spaced apart from the bottom surface. When guided, there is no longer any sliding contact with the bottom surface, so that it is possible to prevent the tool body from being damaged due to wear of the chip pocket due to the sliding contact of chips.
  • this bank is provided in the insert for milling, the seat for mounting and the fitting part are fitted to this tip pocket as in the case of attaching a pad or protective equipment to the tip pocket of the blade type replaceable milling cutter. There is no need to provide a section. For this reason, it is not necessary to provide a large space in the chip pocket, the interval between the insert mounting seats adjacent to each other in the circumferential direction of the tool body can be reduced, and further improvement in processing efficiency can be promoted by increasing the number of blades. It becomes possible.
  • the insert body is formed by joining a base metal part made of a sintered alloy to the cutting edge part made of an ultra-high pressure sintered body having a hardness higher than that of the base metal part
  • a high-hardness ultra-high pressure sintered body such as a diamond sintered body or a cBN sintered body.
  • it has a lower hardness than a sintered body, it is integrally formed on a base metal part made of a sintered alloy such as a hard cemented carbide, so that wear due to chip contact of the bank-like part is also suppressed, and the insert life is spent.
  • the base metal part made of such a sintered alloy is manufactured by sintering a green compact obtained by press-molding the raw material powder of this sintered alloy, the embankment-shaped part is also integrated during the press molding. Can be molded.
  • the side surface of the bank-shaped part facing the corner part is an inclined surface that protrudes from the polygonal surface as the bank part is separated from the corner part, so that when chips get over the bank-shaped part or along the bank-shaped part Resistance when being guided can be reduced. For this reason, it is possible to reliably suppress wear of the bank-shaped portion and to prevent the rotational driving force from becoming unnecessarily large even when cutting is performed by rotating the tool body at a high speed.
  • the embankment portion is arranged so as to extend toward the outer peripheral side toward the rear end side of the tool body.
  • the cutting edge changeable milling cutter is a front milling cutter, the chip generated by the front cutting edge arranged on the tip side of the tool body among the above cutting blades is more reliably moved to the tip pocket without sliding into the chip pocket. It becomes possible to discharge by guiding to the outer peripheral side of the end.
  • FIG. 6 is a side view of the embodiment shown in FIG. 5. It is the partially broken front view which looked at the embodiment shown in FIG. 5 from the axial direction front end side. It is the rear view which looked at embodiment shown in FIG. 5 from the axial direction rear end side. It is an expansion perspective view which shows the insert mounting seat periphery of embodiment shown in FIG.
  • FIG. 11 is an enlarged front view in which the ZZ cross section in FIG. 10 is partially broken, showing the periphery of the insert mounting seat of the embodiment shown in FIG. 5.
  • FIGS. 1 to 4 show an embodiment of the milling insert of the present invention
  • FIGS. 5 to 11 show an embodiment of the blade-tip-exchangeable mill of the present invention to which the milling insert of this embodiment is attached.
  • the form is shown.
  • the insert for milling of the present embodiment has such a rectangular plate shape in which the insert body 1 has a polygonal plate shape, specifically a substantially rectangular plate shape, and is made of a hard sintered alloy such as cemented carbide.
  • the side surface 1 ⁇ / b> C that is continuous with the short side of the two side ridges intersecting the corner portion C of the first polygonal surface 1 ⁇ / b> A is directed to the corner portion C.
  • the side surface 1D that is inclined so as to protrude in the longitudinal direction of the rectangular plate-shaped insert body 1 and continues to the long side of the first polygonal surface 1A that intersects the corner portion C is a portion on the corner portion C side.
  • the thickness direction of the insert body 1 from the first polygonal surface 1A (the left-right direction in FIG. 3; the vertical direction in FIG. 4). ), And the cutting blade portion 3 is joined to the recess 2A by brazing or the like or by being integrally sintered with the base metal portion 2.
  • the cutting edge portion 3 has a substantially right triangular plate shape with a constant thickness, the triangular surface thereof is directed in the thickness direction, and the right angle corner portion of the triangular surface is positioned at the corner portion C.
  • a cutting blade having a triangular surface as a rake face 3A is formed at two side ridges that are joined to the recess 2A and intersect the corner portion C of the triangular surface facing the first polygonal surface 1A.
  • the cutting edge along the short side of the first polygonal surface 1A is a front edge 3B directed to the tip side when attached to the blade tip replaceable milling cutter,
  • the cutting edge along is the outer peripheral blade 3C directed to the outer peripheral side.
  • the bottom surface facing the thickness direction of the concave portion 2A to which the cutting blade portion 3 is joined has a triangular shape that is substantially the same shape and the same size as the rake surface 3A of the cutting blade portion 3, as shown in FIG. As it moves away from the side surface 1C along the long side, it is slightly inclined so as to recede in the thickness direction. Accordingly, along with this, the rake face 3A and the outer peripheral edge 3C of the cutting edge portion 3 are inclined so as to recede in the thickness direction as they are separated from the side face 1C along the long side.
  • the outer peripheral blade 3C has a linear shape extending in the longitudinal direction.
  • the front blade 3B has a bent line shape that is slightly bent at an obtuse angle, and a portion intersecting the corner portion C is formed so as to be substantially orthogonal to the outer peripheral blade 3C in the same plan view.
  • the part on the opposite side to the corner part C of the front blade 3B is extended along the side surface 1C inclined as mentioned above in the same planar view.
  • flank surfaces of the front blade 3B and the outer peripheral blade 3C are flank surfaces of the front blade 3B and the outer peripheral blade 3C, respectively.
  • these flank surfaces go from the first polygonal surface 1 ⁇ / b> A to the second polygonal surface 1 ⁇ / b> B, which is the other of the front and back polygonal surfaces on the back side of the insert body 1. Accordingly, it is inclined so as to be slightly retracted to the inside of the insert main body 1, and is formed so that clearance angles are given to the front blade 3B and the outer peripheral blade 3C.
  • the side surface 1C is inclined so that such a clearance angle is given as a whole.
  • a portion that is retreated in the direction in which the short side extends is a flat surface that extends in the thickness direction, and is adjacent in the plan view as shown in FIG. They extend in directions perpendicular to each other.
  • the intersecting ridge line portions of the side surfaces 1E and 1F and the side surface 1D which are adjacent to each other are chamfered, and the intersecting ridge line portions between the first polygonal surface 1A and the side surface 1E are also chamfered.
  • this bank-shaped part 4 is formed in the base metal part 2 in this embodiment, and is integrally formed in this base metal part 2 which consists of sintered alloys, such as a cemented carbide, as mentioned above especially.
  • the bank-like portion 4 is a bisector of the two side ridge portions intersecting the corner portion C when viewed from the direction facing the first polygonal surface 1A in the thickness direction of the insert body 1. It is desirable that it is formed so as to extend in a direction inclined within a range of ⁇ 30 ° with respect to a vertical straight line and intersect the side ridge portion.
  • the bank-shaped part 4 of this embodiment has a cross-section orthogonal to the direction in which the bank-shaped part 4 extends has an isosceles trapezoidal shape, that is, a pair that approaches each other as it protrudes from the first polygonal surface 1A.
  • Side surfaces 4A and 4B, and a top surface 4C that is provided at the protruding end of the bank 4 and extends perpendicularly to the thickness direction.
  • the side surface 4A of the bank-shaped portion 4 facing the corner portion C is an inclined surface that protrudes from the first polygonal surface 1A as the distance from the corner portion C increases.
  • the bank-shaped portion 4 extends along the wall surface of the concave portion 2A rising from the bottom surface of the concave portion 2A of the base metal portion 2 toward the first polygonal surface 1A, and the first polygonal surface 1A.
  • the long side that intersects with the corner portion C of the corner intersects the step portion of this long side that forms a step shape.
  • step-difference part is chamfered so that it may incline toward the 2nd polygonal surface 1B side as it goes to the level
  • the bank portion 4 intersects the side surface 1C as it is with the side surface 1C of the base metal portion 2 inclined as described above.
  • a planar portion 5 perpendicular to the thickness direction is formed on the first polygonal surface 1A opposite to the corner portion C from the bank-shaped portion 4.
  • the thickness direction of the insert body 1 is a direction perpendicular to the flat portion 5.
  • the front blade 3B has a portion intersecting with the corner portion C extending perpendicularly to the thickness direction, that is, parallel to the plane portion 5, and in particular in the present embodiment, located on the extended surface of the plane portion 5. It is arranged.
  • a first inclined plane 6 that is inclined so as to approach the plane portion 5 is formed toward the side ridge portion.
  • the first inclined flat surface 6 is inclined so as to approach the flat surface portion 5 toward the side ridge portion of the second polygonal surface 1B located on the back side of the outer peripheral blade 3C among the cutting blades.
  • the entire second polygonal surface 1B is such a first inclined plane 6, and the first inclined plane 6 is a cross section (side surface) orthogonal to the plane portion 5 and the side surface 1E. (Cross section parallel to 1F) is formed so as to form a constant inclination angle ⁇ with respect to the plane portion 5.
  • the first polygonal surface 1A has a cross section orthogonal to the plane portion 5 and the first inclined plane 6, that is, a cross section orthogonal to the plane portion 5 and the side surface 1E in this embodiment (parallel to the side surface 1F).
  • a second inclined plane 7 that is inclined in a direction opposite to the direction of inclination of the first inclined plane 6 with respect to the plane portion 5 is formed.
  • the second inclined plane 7 is also formed so as to form a fixed inclination angle ⁇ with respect to the plane portion 5 in the cross section, and the inclination angle ⁇ formed by the second inclined plane 7 with respect to the plane portion 5. As shown in FIG. 11, the inclination angle ⁇ formed by the first inclined plane 6 with respect to the plane portion 5 is made larger.
  • the recess 8 is formed in the first polygonal surface 1A, and the second inclined plane 7 is formed on the bottom surface of the recess 8.
  • the recess 8 is formed in the center of the flat portion 5 so as to extend long in the longitudinal direction of the insert body 1, that is, in the direction in which the outer peripheral blade 3 ⁇ / b> C extends, and the depth in the thickness direction from the flat portion 5. Is formed so as to gradually become deeper from the side surface 1E side toward the side surface 1D side, whereby the second inclined plane 7 which is the bottom surface of the recess 8 is opposite to the inclination direction of the first inclined plane 6 It is formed so as to be inclined.
  • the recess 8 is formed in a closed shape in which the opening to the flat portion 5 forms a D-shape and makes one round on the flat portion 5, that is, opens to the side surfaces 1 C to 1 F of the insert body 1.
  • the second inclined plane 7 which is the bottom surface intersects the plane portion 5 on the side surface 1E side.
  • wall surfaces 8A to 8C are formed on the side surfaces 1C, 1D, and 1F from the second inclined plane 7 toward the flat portion 5 of the first polygonal surface 1A.
  • the wall surface 8C on the side surface 1F is located on the opposite side to the corner portion C in the direction perpendicular to the cross section.
  • the cutting edge exchange type milling cutter of the present embodiment to which the milling insert configured as described above is attached includes a substantially disc-shaped tool main body 11 centering on the axis O, and the outer periphery of the tip end portion of the tool main body 11 includes: An insert mounting seat 12 to which the milling insert is detachably mounted is formed.
  • the tool tip 11 according to this embodiment has such a tool body 11 attached to a main spindle of a machine tool via a tool holder 13 and is perpendicular to the axis O while being rotated at high speed in the tool rotation direction T around the axis O. It is a blade-tip-replaceable type front milling machine that cuts a plane portion of a work material mainly by a front blade 3B of the cutting blade portion 3 of the above-mentioned milling insert by being fed in the direction.
  • the insert mounting seat 12 is formed in a slit shape that opens to the front end surface and the outer peripheral surface of the tool body 11 and extends to the rear end side in the axis O direction, and is a first mounting seat that faces the rear side in the tool rotation direction T.
  • a seat base 12C The cutting edge exchange type milling cutter according to the present embodiment is also a multi-blade cutting edge exchangeable milling machine in which such insert mounting seats 12 are formed in the tool main body 11 at a large number of 24 positions at equal intervals.
  • the first mounting seat wall surface 12A is formed in a planar shape extending along a plane including the axis O, and the mounting seat bottom surface 12C intersects the first mounting seat wall surface 12A perpendicularly. It is formed in a planar shape extending in parallel with the axis O.
  • the second mounting seat wall surface 12B is formed in a planar shape that is parallel to the axis O and is inclined so as to approach the first mounting seat wall surface 12A toward the outer peripheral side of the tool body 11.
  • the inclination angle formed by the seat wall surface 12B with respect to the first mounting seat wall surface 12A is constant in the cross section orthogonal to the axis O as shown in FIG.
  • the inclination angle ⁇ is equal to the inclination angle ⁇ .
  • a screw hole 12D is formed from the outer peripheral surface of the tool body 11 on the tool rotation direction T side of each insert mounting seat 12 to the first mounting seat wall surface 12A, and the insert body 1 is pressed into the screw hole 12D.
  • a clamp screw 14 as a pressing means for attaching is attached.
  • the screw hole 12D has a plane perpendicular to the center line intersecting the first mounting seat wall surface 12A at a constant inclination angle in a cross section perpendicular to the axis O as shown in FIG. As it goes to the outer peripheral side, it extends to the rear side in the tool rotation direction T, and this inclination angle is made equal to the inclination angle ⁇ formed by the second inclined plane 7 of the insert body 1 with respect to the plane portion 5.
  • the front end surface of the clamp screw 14 directed toward the insert mounting seat 12 is a flat surface perpendicular to the center line of the screw hole 12D.
  • a tip pocket 15 is formed on the outer periphery of the distal end portion of the tool body 11 on the distal end side with respect to the outer peripheral surface of the screw hole 12D on the tool rotation direction T side of each insert mounting seat 12.
  • the tip pocket 15 has a triangular chamfered shape in which the crossed ridge line portion between the tip surface and the outer peripheral surface of the tool body 11 becomes wider toward the inner peripheral side of the rear end toward the rear side in the tool rotation direction T. It is formed so as to be cut out.
  • the triangular chamfered bottom surface 15A of the chip pocket 15 thus cut out intersects the first mounting seat wall surface 12A of the insert mounting seat 12, and therefore the first mounting seat wall surface 12A and the bottom surface 15A.
  • the crossing ridge line portion extends obliquely toward the outer peripheral side toward the rear end side of the tool body 11.
  • the angle formed by the intersecting ridge line portion with respect to the plane perpendicular to the axis O is formed by the bank-like portion 4 with respect to the front blade 3B when viewed from the direction facing the first polygonal surface 1A of the milling insert. Is equal to the angle.
  • the crossing angle between the bottom surface 15A and the first mounting seat wall surface 12A is made equal to the crossing angle between the side surface 4B facing the opposite side of the corner portion C of the bank portion 4 of the insert body 1 and the flat surface portion 5. ing.
  • a coolant hole 15B drilled in the tool body 11 is opened on the bottom surface 15A of the chip pocket 15.
  • the coolant hole 15B communicates with the coolant supply hole provided on the spindle side of the machine tool from the tool body 11 through the supply path in the tool holder 13, and is supplied from the machine tool side during cutting.
  • a coolant such as a cutting fluid can be supplied toward the rake face 3A of the cutting blade portion 3 of the milling insert attached to the insert mounting seat 12 as will be described later.
  • each insert mounting seat 12 On the other hand, on the rear end side of each insert mounting seat 12, a concave groove 11A that opens to the outer peripheral surface of the tool body 11 and extends to the rear end side is formed, and the rear end of the slit-shaped insert mounting seat 12 is The concave grooves 11A are open, and each of the concave grooves 11A is provided with an adjusting mechanism 16 for adjusting the position of the insert body 1 of the milling insert in the direction of the axis O. As shown in FIG. 10, the adjusting mechanism 16 includes first and second screw portions 17A and 17B having different pitches at both ends, and the first screw portion 17A is located on the tip side of the groove 11A.
  • a shaft member 17 that is screwed into a screw hole formed in the facing wall surface in parallel with the axis O, and a nut member 18 that is screwed into the second screw portion 17B facing the tip end side of the tool body 11 of the shaft member 17 are provided. Yes.
  • the pitch of the first screw portion 17A of the shaft member 17 is made larger than the pitch of the second screw portion 17B, and the screw diameter of the first screw portion 17A is larger than that of the second screw portion 17B.
  • locked portions 17C and 18A capable of locking the work tool are formed,
  • the locked portions 17C and 18A are holes through which a wrench or the like can be inserted.
  • the tip surface 18B of the nut member 18 directed toward the tip side of the tool body 11 has a convex shape that bulges toward the tip side.
  • the milling insert has the first polygonal surface 1A of the insert main body 1 and the rake face 3A of the cutting edge portion 3 directed in the tool rotation direction T on the tool main body 11 of the blade-tip-exchangeable milling machine configured as described above.
  • the side surface 1C is inserted into the insert mounting seat 12 from the front end side of the tool main body 11 with the side surface 1C facing the front end side of the tool main body 11 and the side surface 1D facing the outer peripheral side.
  • the interval between the first and second mounting seat wall surfaces 12A and 12B of the insert mounting seat 12 is such that the side surface 1E of the insert body 1 is in close contact with the mounting seat bottom surface 12C, and the first polygonal surface 1A.
  • the insert body 1 can be inserted while the flat portion 5 and the second polygonal surface 1B (first inclined plane 6) are in sliding contact with the first and second mounting seat wall surfaces 12A and 12B. It is said.
  • the radial depth of the insert mounting seat 12 from the outer peripheral surface of the tool body 11 to the mounting seat bottom surface 12C is such that the side surface 1E of the insert body 1 is in close contact with the mounting seat bottom surface 12C.
  • the outer peripheral blade 3C of the cutting blade portion 3 directed to the outer peripheral side has a size protruding from the outer peripheral surface.
  • the front blade 3B of the cutting blade portion 3 of the milling insert attached to each insert mounting seat 12 protrudes from the front end surface of the tool body 11 on a single plane perpendicular to the axis O.
  • the position in the direction of the axis O is adjusted by the adjusting mechanism 16 so as to be positioned at the position. That is, in the adjustment mechanism 16 of the present embodiment, the working tool is locked to the locked portions 17C and 18A, the shaft member 17 and the nut member 18 are rotated, and the tool of the first screw portion 17A of the shaft member 17 is rotated.
  • the position of the tip surface 18B of the nut member 18 in the direction of the axis O is set.
  • the position of the front blade 3B can also be adjusted as described above.
  • the bank-like portion 4 is It is arranged so as to extend toward the outer peripheral side as it goes toward the rear end side of the tool body 11 in parallel along the part.
  • the bank 4 may have a side surface 4B facing the corner C opposite to the bottom surface 15A of the chip pocket 15 and may be spaced apart.
  • this is a blade-tip-exchangeable face mill that cuts the flat portion mainly by the front blade 3B of the cutting blade portion 3 in particular.
  • chips generated by the front blade 3B flow out to the rear end side of the tool body 11 at high speed along the rake face 3A.
  • the front blade 3B intersecting the corner portion C and the two side ridge portions of the first polygonal surface 1A formed with the outer peripheral blade 3C are intersected.
  • the chips are discharged to the outer peripheral side of the rear end of the tool body 11 as guided by the bank 4.
  • the chips come into sliding contact with the bottom surface 15A of the chip pocket 15, and it is possible to prevent the tool body 11 from being damaged due to accelerated wear due to sliding contact of the chips flowing out at high speed. it can.
  • the wall surface is cut into the work material with a relatively large depth of cut mainly by the outer peripheral edge 3C of the cutting edge 3, the chips flow out from the outer peripheral edge 3C to the inner peripheral side of the tool body 11.
  • the bank 4 extends in the direction of chip discharge, and the chips are discharged so as to be spaced from the bottom surface 15A by riding on the bank 4. It becomes possible to suppress damage to the tool body 11.
  • the embankment part 4 which prevents the damage of the tool main body 11 by abrasion of the tip pocket 15 in this way is provided not in the tool main body 11 but in the insert main body 1 of the milling insert, such an insert for milling is attached.
  • the cutting edge-changing milling cutter does not require a space for attachment as in the case of attaching a pad or a protector to the chip pocket 15 itself. For this reason, since the number of the insert mounting seats 12 adjacent in the circumferential direction of the tool body 11 can be reduced and the number thereof can be increased, the number of milling inserts that can be attached to one tool body 11 is also increased. Thus, it is possible to increase the number of blades, and it is possible to promote further improvement in processing efficiency together with high-speed cutting.
  • the insert body 1 is placed on the base metal part 2 made of a hard sintered alloy such as a cemented carbide alloy, and the high hardness ultrahigh pressure firing such as a diamond sintered body or a cBN sintered body.
  • a cutting blade portion 3 made of a bonded body is joined and formed, and the bank-like portion 4 is formed integrally with the base metal portion 2. For this reason, it is possible to prevent the bank-shaped part 4 itself from being worn even if chips are brought into contact with the bank-shaped part 4 by being guided or climbed up while securing the life of the cutting blade part 3.
  • the tool body 11 can be reliably prevented from being damaged until the life of the insert body 1 is consumed, and the green compact produced on the base metal part 2 is formed from a sintered alloy raw material powder by press molding. Moreover, since the bank-shaped part 4 can also be shape
  • the side face 4A of the bank-shaped portion 4 facing the corner portion C side of the cutting edge portion 3 that comes into contact with the outflowing chips is separated from the corner portion C as the first polygonal shape. It is set as the inclined surface which protrudes from the surface 1A, and can reduce the resistance by the contact of chips. Accordingly, it is possible to more reliably suppress the wear of the bank-shaped portion 4 due to such chip contact, and to prevent the rotational driving force when the tool body 11 is rotated at a high speed from becoming unnecessarily large.
  • the side surface 4A may extend in the thickness direction of the insert body 1, but if the inclination of the side surface 4A with respect to the thickness direction becomes too large, the chips may not be reliably guided.
  • the inclination is preferably 0 ° to 45 ° with respect to the thickness direction.
  • the protruding height of the bank-shaped portion 4 in the thickness direction is preferably about 0.5 mm to 2.0 mm as the protruding height from the front blade 3B, for example.
  • such a bank-like part 4 is formed in the milling insert, whereby the flat surface part 5 of the insert body 1 and the first mounting seat wall surface of the insert mounting seat 12 are formed. It is possible to prevent not only chips but also dust such as fine chips from entering between 12A.
  • the insert body 1 when the insert body 1 is inserted into the insert mounting seat 12 with the tip surface of the tool body 11 facing upward at the time of the preset operation of removing the tool body from the machine tool and aligning the position of the front blade 3B in the axis O direction, Since the insert main body 1 is simply positioned when 4 abuts the intersecting ridge line portion between the first mounting seat wall surface 12A and the bottom surface 15A of the chip pocket 15, the position of the insert main body 1 is adjusted by the adjusting mechanism 16 from this state.
  • the preset time can be shortened by finely adjusting.
  • the insert body 1 has first and second polygonal surfaces 1A and 1B on the front and back sides, and the first polygonal surface 1A is provided with a flat surface portion 5;
  • the second polygonal surface 1B is formed with a first inclined plane 6 that is inclined so as to approach the plane portion 5 toward the side ridge portion located on the back side of the outer peripheral blade 3C.
  • the surface 1A further includes a second inclined plane 7 that is inclined in a direction opposite to the direction of inclination of the first inclined plane 6 with respect to the plane section 5 in a cross section orthogonal to the plane section 5 and the first inclined plane 6. Is formed.
  • the insert mounting seat 12 of the cutting edge-exchangeable mill to which such a milling insert is mounted is a first mounting facing the flat portion 5 of the first polygonal surface 1A facing the tool rotation direction T rear side. 12 A of seat wall surfaces, the 2nd mounting seat wall surface 12B to which the said 1st inclined plane 6 closely_contact
  • the distance between the flat portion 5 of the insert body 1 and the first inclined plane 6 and the distance between the first and second mounting seat wall surfaces 12A and 12B of the insert mounting seat 12 are on the outer peripheral side of the tool body 11.
  • these surfaces form an intersecting angle larger than the intersecting angle formed in the cross section, so that the distance between the first and second inclined planes 6 and 7 is also different from that of the tool body 11. It becomes smaller as it goes to the outer peripheral side.
  • the insert body 1 can be firmly attached to the insert mounting seat 12, and even if the tool body 11 is rotated at a high speed as described above and the cutting process is performed, the insert body 1 is moved to the outer periphery of the tool body 11 by centrifugal force. It can be prevented from moving to the side or falling off.
  • the inclination angle ⁇ formed by the second inclined plane 7 with respect to the plane portion 5 is the first inclined plane 6. It is made larger than the inclination angle ⁇ formed with respect to the flat portion 5. For this reason, since the crossing angle of the first and second inclined planes 6 and 7 can be made larger than the crossing angle of the plane portion 5 and the first inclined plane 6 in the same cross section, it is more sure. It is possible to prevent the insert body 1 from being displaced or dropped out.
  • a recess 8 is formed in the first polygonal surface 1A, and a second inclined plane 7 is formed on the bottom surface of the recess 8.
  • a convex portion is formed on the flat portion 5 of the first polygonal surface 1A, and the protruding end surface of the convex portion is opposite to the inclination direction of the first inclined plane 6 with respect to the flat portion 5 in the cross section.
  • a concave groove through which this convex portion can be inserted is provided in order to insert the insert body 1 from the distal end side of the tool body 11.
  • the insert mounting seat 12 must be formed on the first mounting seat wall surface 12A, and there is a possibility that the interval between the adjacent insert mounting seats 12 cannot be reduced. There is no need to form a groove, and it is possible to reliably reduce the distance between the insert mounting seats 12 and increase the number of blades of the blade-tip replaceable milling cutter.
  • the opening to the first polygonal surface 1A (plane portion 5) of the recess 8 is formed in a closed shape that makes one round on the plane portion 5, and the insert body 1
  • the side surfaces 1C to 1F are not open, and accordingly, the first inclined plane 7 which is the bottom surface of the recess 8 is provided on the side opposite to the corner portion C in the direction perpendicular to the cross section.
  • a wall surface 8C directed to the polygonal surface 1A is formed.
  • the wall surface 8C hits the tip of the clamp screw 14 until the clamp screw 14 comes out of the recess 8, so that the insert body 1 is inserted into the insert body 1. It can prevent falling from the mounting seat 12, and can prevent damage or loss of the insert body 1 due to dropping.
  • the recess 8 is formed so as to extend long in the longitudinal direction of the insert body 1 having a rectangular plate shape, that is, in the direction in which the linear outer peripheral blade 3C extends. Even if the side surface 1C of the insert body 1 is re-polished and the front blade 3B is sharpened again, the adjustment mechanism 16 causes the insert body 1 to move in the direction of the axis O in the range in which the recess 8 extends.
  • the insert body 1 can be fixed by the clamp screw 14 after adjusting the position. For this reason, particularly in the milling insert in which the cutting edge portion 3 is made of an expensive ultra-high pressure sintered body as in the present embodiment, it is possible to extend the insert life and effectively use resources.
  • the cutting edge exchange type milling cutter of the present embodiment is a multi-blade milling cutter as described above, in which the interval between the insert mounting seats 12 adjacent in the circumferential direction is reduced, and the clamp of one insert mounting seat 12 is The interval between the screw hole 12D into which the screw 14 is screwed and the insert mounting seat 12 adjacent to the tool mounting direction T of the insert mounting seat 12 is also reduced. Then, when the insert body 1 is fixed by screwing the clamp screw 14, the tool body 11 is slightly elastically deformed between the insert mounting seats 12 due to the reaction force, and is attached to the insert mounting seat 12 adjacent to the tool rotation direction T. Since the action of pressing the inserted insert body 1 in the tool rotation direction T side occurs, the milling insert can be attached more stably, and the diameter of the clamp screw 14 can be reduced. It is possible to achieve cutting.

Abstract

The present invention is designed to increase the number of edges on an exchangeable tool edge milling cutter while preventing damage to chip pockets by scarf that is generated by high speed rotary cutting. A milling cutter insert, which is detachably installed on an insert attachment seat formed on the circumference of the tool body tip of an exchangeable tool edge milling cutter that is rotated around the axial line, is provided with a polygonal plate-shaped insert body (1). A cutting edge (3) having a cutting face (3A) on the polygonal surface (1A) is provided on a corner (C) of the polygonal surface (1A) of the insert body (1). At a position that looks toward the corner (C) of the polygonal surface (1A) with the cutting face (3A) interposed between the position and the corner, a ridge-shaped section (4) protruding from the polygonal surface (1A) is formed so as to extend in a direction that intersects with the two side ridges of the polygonal surface (1A) that intersect at the corner (C) when the polygonal surface (1A) is viewed head-on.

Description

フライス用インサートおよび刃先交換式フライスMilling inserts and replaceable milling cutters
　本発明は、軸線回りに回転させられる刃先交換式フライスの工具本体先端外周部に形成されたインサート取付座に着脱可能に取り付けられるフライス用インサート、およびこのフライス用インサートが着脱可能に取り付けられた刃先交換式フライスに関するものである。 The present invention relates to a milling insert that is removably attached to an insert mounting seat formed on the outer periphery of a tool body tip of a blade-tip-exchangeable mill that is rotated about an axis, and a blade tip to which the milling insert is detachably attached. It relates to replaceable milling.
　このようなフライス用インサートが着脱可能に取り付けられた刃先交換式フライスとして、特許文献１、２には、アルミニウムやアルミニウム合金等の被削材の切削加工を行う場合の加工効率を高めるために、工具本体もアルミニウムやアルミニウム合金で形成して軽量化を図り、この工具本体を４０００～５０００ｍ毎分程度の切削速度で高速回転させて切削加工を行うことが記載されている。 In order to increase the processing efficiency when cutting a work material such as aluminum or aluminum alloy in Patent Documents 1 and 2, as a blade-exchangeable mill with such a milling insert detachably attached, It is described that the tool body is also made of aluminum or an aluminum alloy to reduce the weight, and that the tool body is rotated at a cutting speed of about 4000 to 5000 m / min.
　ところが、このように工具本体を高速回転させて切削加工を行う場合には、切屑も高速で生成されて排出されるのに対し、上述のような材質によって工具本体を軽量化すると、軽量であるとともに低硬度でもある工具本体の特に切屑が排出されるチップポケットに、摩耗による損傷が生じてしまう。そこで、特許文献１には、チップポケットの始端側にクロムモリブデン鋼等の耐摩耗性のあるパッドを取り付けることが、また特許文献２には、切屑が当たるチップポケットの底面に摩耗損傷保護具を取り付けることが、それぞれ提案されている。 However, when cutting is performed by rotating the tool main body at a high speed in this way, chips are also generated and discharged at a high speed. On the other hand, if the tool main body is reduced in weight by the material as described above, the weight is reduced. At the same time, damage due to wear occurs in the chip pocket of the tool main body, which is also low in hardness, in which chips are discharged. Therefore, in Patent Document 1, a wear-resistant pad such as chrome molybdenum steel is attached to the starting end side of the chip pocket, and in Patent Document 2, a wear damage protective device is provided on the bottom surface of the chip pocket to which chips hit. Each is proposed to be installed.
特開２００２－１７８２１２号公報JP 2002-178212 A 特開２００６－１５９３５８号公報JP 2006-159358 A
　ところで、このような耐摩耗性のあるパッドや摩耗損傷保護具を、高速で回転する工具本体から脱落しないようにチップポケットに取り付けるには、特許文献１に記載されているように、パッドの端部を鉤状に膨らませてチップポケットや工具本体先端の座に嵌め込むようにしたり、特許文献２に記載されているように、摩耗損傷保護具に保護具嵌合部を設けるとともにチップポケットには取付け部嵌合部を設けて、これらを噛み合わせるようにしたりしなければならず、このような座や取付け部嵌合部を設けるためにチップポケットにもある程度のスペースが必要となる。 By the way, in order to attach such a wear-resistant pad and wear damage protector to the chip pocket so as not to fall off from the tool body rotating at high speed, as described in Patent Document 1, the end of the pad is used. The part is inflated into a bowl shape and fitted into the tip pocket or the seat at the tip of the tool body, or, as described in Patent Document 2, a protective equipment fitting part is provided in the wear damage protector, An attachment portion fitting portion must be provided so as to be engaged with each other. In order to provide such a seat and the attachment portion fitting portion, a certain amount of space is required also in the chip pocket.
　しかしながら、近年では、上述のような被削材の切削加工における加工効率をさらに高めるため、工具本体に取り付けられるフライス用インサートの数を増やして多刃化を図ることが求められており、そのような刃先交換式フライスでは、周方向に隣接するインサート取付座同士の間隔や、この間隔部分に形成されてインサート取付座の工具回転方向側に開口するチップポケットの大きさも制限されざるを得ない。従って、このように多刃化を図る上では、特許文献１、２に記載されたようにパッドや保護具を高速回転でも脱落しないように取り付けてチップポケットの損傷を防ぐのは困難となる。 However, in recent years, in order to further increase the processing efficiency in the cutting of the work material as described above, it has been required to increase the number of milling inserts attached to the tool body and to increase the number of blades. In such a blade-tip-exchangeable mill, the interval between the insert mounting seats adjacent to each other in the circumferential direction and the size of the tip pocket formed in this interval portion and opening to the tool rotation direction side of the insert mounting seat must be limited. Therefore, in order to increase the number of blades in this way, it is difficult to prevent the chip pocket from being damaged by attaching the pads and the protectors so as not to drop even at high speed rotation as described in Patent Documents 1 and 2.
　本発明は、このような背景の下になされたもので、上述のようにチップポケットにパッドや保護具を取り付けるスペースを要することなく、刃先交換式フライスの多刃化を図りつつ、高速回転切削加工において生成される切屑によるチップポケットの損傷を防ぐことが可能なフライス用インサート、およびこのようなフライス用インサートを着脱可能に取り付けた刃先交換式フライスを提供することを目的としている。 The present invention has been made under such a background, and as described above, without requiring a space for attaching a pad or a protector to a chip pocket, high-speed rotating cutting is achieved while increasing the number of blades of a replaceable blade mill. An object of the present invention is to provide a milling insert capable of preventing damage to a chip pocket due to chips generated in machining, and a blade-tip-exchangeable milling device to which such a milling insert is detachably attached.
　上記課題を解決して、このような目的を達成するために、本発明のフライス用インサートは、軸線回りに回転させられる刃先交換式フライスの工具本体先端外周部に形成されたインサート取付座に着脱可能に取り付けられるフライス用インサートであって、多角形板状のインサート本体を備え、このインサート本体の多角形面のコーナ部に、該多角形面上にすくい面を有する切刃部が設けられているとともに、この切刃部の上記すくい面を間にして上記多角形面の上記コーナ部を臨む位置には、該多角形面から突出する堤状部が、この多角形面に対向する方向から見て上記コーナ部に交差する該多角形面の２つの辺稜部に交差する方向に延びるように形成されていることを特徴とする。 In order to solve the above-mentioned problems and achieve such an object, the insert for milling of the present invention is attached to and detached from an insert mounting seat formed on the outer periphery of the tool body tip of a blade-type replaceable milling cutter rotated around an axis. An insert for milling that can be attached, comprising a polygonal plate-like insert body, and a corner portion of the polygonal surface of the insert body provided with a cutting edge portion having a rake face on the polygonal surface. In addition, at the position facing the corner portion of the polygonal surface with the rake face of the cutting edge portion in between, the bank-shaped portion protruding from the polygonal surface is from the direction facing the polygonal surface. It is formed so as to extend in a direction intersecting with two side ridge portions of the polygonal surface intersecting the corner portion as seen.
　また、本発明の刃先交換式フライスは、軸線回りに回転させられる工具本体の先端部外周に形成されたインサート取付座に、上記本発明のフライス用インサートが着脱可能に取り付けられた刃先交換式フライスであって、上記工具本体の先端部外周には、上記インサート取付座の工具回転方向側に開口するチップポケットが形成されるとともに、上記インサート取付座は、工具回転方向後方側を向いて上記インサート本体の上記多角形面と対向する取付座壁面を備え、上記フライス用インサートは、上記コーナ部を上記工具本体の先端外周側に突出させるとともに、上記切刃部のすくい面を工具回転方向に向けて、上記堤状部が上記チップポケットの底面と上記取付座壁面との交差稜線部に沿って延びるように取り付けられることを特徴とする。 Further, the cutting edge replaceable milling cutter according to the present invention is a cutting edge replaceable milling cutter in which the insert for milling according to the present invention is detachably mounted on an insert mounting seat formed on the outer periphery of the tip end of a tool body rotated around an axis. A tip pocket that opens to the tool rotation direction side of the insert mounting seat is formed on the outer periphery of the tip end portion of the tool body, and the insert mounting seat faces the rear side in the tool rotation direction. A mounting seat wall facing the polygonal surface of the main body, and the insert for milling projects the corner portion to the outer peripheral side of the tip of the tool main body and directs the rake face of the cutting edge portion in the tool rotation direction. The bank-shaped part is attached so as to extend along the crossing ridge line part between the bottom surface of the chip pocket and the wall surface of the mounting seat. That.
　このように上記構成のフライス用インサートが取り付けられた刃先交換式フライスにおいて、このフライス用インサートの工具本体先端外周側に突出するコーナ部に設けられた切刃部によって生成される切屑は、インサート本体の上記多角形面上に設けられたこの切刃部のすくい面を擦過しつつ流出する。そして、この切刃部のすくい面を間にして多角形面の上記コーナ部を臨む位置には、該多角形面から突出する堤状部が、多角形面に対向する方向から見て上記コーナ部に交差する多角形面の２つの辺稜部、すなわち上記切刃部の切刃に交差する方向に延びている。 In this way, the cutting edge generated by the cutting edge portion provided at the corner protruding from the outer periphery of the tool body of the milling insert is inserted into the insert body. It flows out while rubbing the rake face of the cutting edge portion provided on the polygonal surface. Then, at the position facing the corner portion of the polygonal surface with the rake face of the cutting edge in between, the bank-shaped portion protruding from the polygonal surface is seen from the direction facing the polygonal surface and the corner It extends in the direction intersecting the two edge parts of the polygonal surface intersecting the part, that is, the cutting edge of the cutting edge part.
　このため、工具本体を高速で回転させて切削加工を行ったときに、切屑が切刃部の上記切刃から高速で生成されて流出しても、この切屑は、多角形面から突出した堤状部に乗り上げ、あるいはこの堤状部に沿って該堤状部が延びる方向に案内されるようにして排出される。従って、この堤状部の工具本体内周側に位置することになるチップポケットの底面に対して切屑は、堤状部に乗り上げたときには該底面と間隔をあけて排出され、また堤状部に案内されたときには底面に摺接すること自体がなくなるので、切屑の摺接によるチップポケットの摩耗によって工具本体が損傷するのを防ぐことができる。 For this reason, even when cutting is performed by rotating the tool body at a high speed, even if chips are generated at a high speed from the cutting edge of the cutting edge portion and flow out, the chips will not protrude from the polygonal surface. It is discharged in such a way that it rides on the ridge or is guided in the direction in which the ridge extends along the ridge. Therefore, the chips are discharged at a distance from the bottom surface of the chip pocket, which is located on the inner peripheral side of the tool body of the bank-like portion, and are spaced apart from the bottom surface. When guided, there is no longer any sliding contact with the bottom surface, so that it is possible to prevent the tool body from being damaged due to wear of the chip pocket due to the sliding contact of chips.
　そして、さらにこの堤状部はフライス用インサートに設けられているので、刃先交換式フライスのチップポケットにパッドや保護具を取り付ける場合のように、このチップポケットに取り付け用の座や取付け部嵌合部を設ける必要がない。このため、チップポケットに大きなスペースを設ける必要もなくなって、工具本体の周方向に隣接するインサート取付座同士の間隔を狭めることができ、多刃化を図ってさらなる加工効率の向上を促すことが可能となる。 In addition, since this bank is provided in the insert for milling, the seat for mounting and the fitting part are fitted to this tip pocket as in the case of attaching a pad or protective equipment to the tip pocket of the blade type replaceable milling cutter. There is no need to provide a section. For this reason, it is not necessary to provide a large space in the chip pocket, the interval between the insert mounting seats adjacent to each other in the circumferential direction of the tool body can be reduced, and further improvement in processing efficiency can be promoted by increasing the number of blades. It becomes possible.
　ここで、上記インサート本体が、焼結合金よりなる台金部に、この台金部よりも高硬度の超高圧焼結体よりなる上記切刃部が接合されて形成されている場合には、上記堤状部を上記台金部に一体に形成することにより、ダイヤモンド焼結体やｃＢＮ焼結体等の高硬度な超高圧焼結体によって切刃部の寿命を確保しつつ、この超高圧焼結体よりは低硬度であるものの硬質な超硬合金等の焼結合金よりなる台金部に一体形成することで堤状部の切屑接触による摩耗も抑制して、インサート寿命が費えるまで確実にチップポケットへの切屑摺接を防ぐことができる。また、このような焼結合金よりなる台金部は、この焼結合金の原料粉末をプレス成形した圧粉体を焼結して製造されるので、このプレス成形の際に堤状部も一体に成形することができる。 Here, when the insert body is formed by joining a base metal part made of a sintered alloy to the cutting edge part made of an ultra-high pressure sintered body having a hardness higher than that of the base metal part, By forming the bank-shaped part integrally with the base metal part, this ultra-high pressure is ensured while ensuring the life of the cutting edge part by a high-hardness ultra-high pressure sintered body such as a diamond sintered body or a cBN sintered body. Although it has a lower hardness than a sintered body, it is integrally formed on a base metal part made of a sintered alloy such as a hard cemented carbide, so that wear due to chip contact of the bank-like part is also suppressed, and the insert life is spent. It is possible to reliably prevent chip sliding contact with the chip pocket. In addition, since the base metal part made of such a sintered alloy is manufactured by sintering a green compact obtained by press-molding the raw material powder of this sintered alloy, the embankment-shaped part is also integrated during the press molding. Can be molded.
　さらに、この堤状部の上記コーナ部を向く側面を、該コーナ部から離間するに従い上記多角形面から突出する傾斜面とすることにより、切屑が堤状部を乗り越える際や堤状部に沿って案内される際の抵抗を低減することができる。このため、堤状部の摩耗を確実に抑制することができるとともに、工具本体を高速回転させて切削加工を行う場合でも回転駆動力が必要以上に大きくなるのを防ぐことが可能となる。 Further, the side surface of the bank-shaped part facing the corner part is an inclined surface that protrudes from the polygonal surface as the bank part is separated from the corner part, so that when chips get over the bank-shaped part or along the bank-shaped part Resistance when being guided can be reduced. For this reason, it is possible to reliably suppress wear of the bank-shaped portion and to prevent the rotational driving force from becoming unnecessarily large even when cutting is performed by rotating the tool body at a high speed.
　さらにまた、このようなフライス用インサートを取り付けた刃先交換式フライスにおいては、上記堤状部が上記工具本体の後端側に向かうに従い外周側に向けて延びるように配設することにより、特に当該刃先交換式フライスが正面フライスである場合に、上記切刃のうち工具本体先端側に配置される正面切刃によって生成された切屑を、より確実にチップポケットに摺接させることなく工具本体の後端外周側に案内して排出することが可能となる。 Furthermore, in the blade-tip-exchangeable mill with such a milling insert attached, the embankment portion is arranged so as to extend toward the outer peripheral side toward the rear end side of the tool body. When the cutting edge changeable milling cutter is a front milling cutter, the chip generated by the front cutting edge arranged on the tip side of the tool body among the above cutting blades is more reliably moved to the tip pocket without sliding into the chip pocket. It becomes possible to discharge by guiding to the outer peripheral side of the end.
　以上説明したように、本発明によれば、刃先交換式フライスのチップポケットに大きなスペースを必要とせずに、切屑の摺接によるチップポケットの摩耗や工具本体の損傷を防ぐことができ、この工具本体の周方向に隣接するインサート取付座同士の間隔を小さくして多刃化を図ることにより、加工効率の一層の向上を促進することが可能となる。 As described above, according to the present invention, it is possible to prevent wear of the chip pocket and damage to the tool body due to sliding contact of chips without requiring a large space in the chip pocket of the blade type replaceable milling machine. By reducing the interval between the insert mounting seats adjacent to each other in the circumferential direction of the main body and increasing the number of blades, it is possible to further improve the processing efficiency.
本発明のフライス用インサートの一実施形態を示す斜視図である。It is a perspective view which shows one Embodiment of the insert for milling of this invention. 図１に示す実施形態の多角形面に対向する方向から見た平面図である。It is the top view seen from the direction which opposes the polygonal surface of embodiment shown in FIG. 図１に示す実施形態の側面図である。It is a side view of embodiment shown in FIG. 図１に示す実施形態の正面図である。It is a front view of embodiment shown in FIG. 本発明の刃先交換式フライスの一実施形態を示す斜視図である。It is a perspective view which shows one Embodiment of the blade-tip-exchange-type milling machine of this invention. 図５に示す実施形態の側面図である。FIG. 6 is a side view of the embodiment shown in FIG. 5. 図５に示す実施形態を軸線方向先端側から見た一部破断正面図である。It is the partially broken front view which looked at the embodiment shown in FIG. 5 from the axial direction front end side. 図５に示す実施形態を軸線方向後端側から見た背面図である。It is the rear view which looked at embodiment shown in FIG. 5 from the axial direction rear end side. 図５に示す実施形態のインサート取付座周辺を示す拡大斜視図である。It is an expansion perspective view which shows the insert mounting seat periphery of embodiment shown in FIG. 図５に示す実施形態のインサート取付座周辺を示す拡大側面図である。It is an enlarged side view which shows the insert mounting seat periphery of embodiment shown in FIG. 図５に示す実施形態のインサート取付座周辺を示す、図１０におけるＺＺ断面を一部破断した拡大正面図である。FIG. 11 is an enlarged front view in which the ZZ cross section in FIG. 10 is partially broken, showing the periphery of the insert mounting seat of the embodiment shown in FIG. 5.
　図１ないし図４は、本発明のフライス用インサートの一実施形態を示すものであり、図５ないし図１１は、この実施形態のフライス用インサートを取り付けた本発明の刃先交換式フライスの一実施形態を示すものである。本実施形態のフライス用インサートは、そのインサート本体１が多角形板状、具体的には略長方形板状をなしており、超硬合金等の硬質な焼結合金よりなるこのような長方形板状の台金部２と、インサート本体１の表裏の多角形面１Ａ、１Ｂのうちの一方の第１の多角形面１Ａの１つのコーナ部Ｃにおいて台金部２に接合された、台金部２よりもさらに高硬度なダイヤモンド焼結体やｃＢＮ焼結体等の超高圧焼結体よりなる切刃部３とを備えている。 FIGS. 1 to 4 show an embodiment of the milling insert of the present invention, and FIGS. 5 to 11 show an embodiment of the blade-tip-exchangeable mill of the present invention to which the milling insert of this embodiment is attached. The form is shown. The insert for milling of the present embodiment has such a rectangular plate shape in which the insert body 1 has a polygonal plate shape, specifically a substantially rectangular plate shape, and is made of a hard sintered alloy such as cemented carbide. The base metal part 2 and the base metal part joined to the base metal part 2 at one corner C of the first polygonal surface 1A of the polygonal surfaces 1A and 1B on the front and back of the insert body 1 2 and a cutting edge portion 3 made of an ultra-high pressure sintered body such as a diamond sintered body or a cBN sintered body having a hardness higher than 2.
　図２に示すように、インサート本体１は、この第１の多角形面１Ａの上記コーナ部Ｃに交差する２つの辺稜部のうちの短辺に連なる側面１Ｃが、該コーナ部Ｃに向かうに従い長方形板状のインサート本体１の長手方向に突出するように傾斜しているとともに、コーナ部Ｃに交差する第１の多角形面１Ａの長辺に連なる側面１Ｄは、コーナ部Ｃ側の部分が短辺の延びる方向に一段突出するような段状をなしている。また、台金部２における第１の多角形面１Ａのコーナ部Ｃには、この第１の多角形面１Ａからインサート本体１の厚さ方向（図３において左右方向。図４においては上下方向）に凹んだ凹部２Ａが形成されており、この凹部２Ａに上記切刃部３が、ロウ付け等により、または台金部２と一体焼結されることにより接合されている。 As shown in FIG. 2, in the insert body 1, the side surface 1 </ b> C that is continuous with the short side of the two side ridges intersecting the corner portion C of the first polygonal surface 1 </ b> A is directed to the corner portion C. The side surface 1D that is inclined so as to protrude in the longitudinal direction of the rectangular plate-shaped insert body 1 and continues to the long side of the first polygonal surface 1A that intersects the corner portion C is a portion on the corner portion C side. Has a step shape that protrudes one step in the direction in which the short side extends. Further, in the corner portion C of the first polygonal surface 1A in the base metal portion 2, the thickness direction of the insert body 1 from the first polygonal surface 1A (the left-right direction in FIG. 3; the vertical direction in FIG. 4). ), And the cutting blade portion 3 is joined to the recess 2A by brazing or the like or by being integrally sintered with the base metal portion 2.
　切刃部３は、一定の厚さの略直角三角形平板状をなしていて、その三角形面を上記厚さ方向に向けるとともに、この三角形面の直角角部を上記コーナ部Ｃに位置させて上記凹部２Ａに接合されており、第１の多角形面１Ａ側に向けられた三角形面の上記コーナ部Ｃに交差する２つの辺稜部に、この三角形面をすくい面３Ａとする切刃が形成されている。これらの切刃のうち、第１の多角形面１Ａの上記短辺に沿った切刃は刃先交換式フライスに取り付けられたときにその先端側に向けられる正面刃３Ｂとされ、上記長辺に沿った切刃は外周側に向けられる外周刃３Ｃとされる。 The cutting edge portion 3 has a substantially right triangular plate shape with a constant thickness, the triangular surface thereof is directed in the thickness direction, and the right angle corner portion of the triangular surface is positioned at the corner portion C. A cutting blade having a triangular surface as a rake face 3A is formed at two side ridges that are joined to the recess 2A and intersect the corner portion C of the triangular surface facing the first polygonal surface 1A. Has been. Among these cutting edges, the cutting edge along the short side of the first polygonal surface 1A is a front edge 3B directed to the tip side when attached to the blade tip replaceable milling cutter, The cutting edge along is the outer peripheral blade 3C directed to the outer peripheral side.
　切刃部３が接合される凹部２Ａの上記厚さ方向を向く底面は、切刃部３の上記すくい面３Ａと略同形同大の三角形状をなしており、図３に示すように上記長辺に沿って側面１Ｃから離間するに従い、上記厚さ方向に後退するように僅かに傾斜している。従って、これに伴い、切刃部３のすくい面３Ａおよび外周刃３Ｃも上記長辺に沿って側面１Ｃから離間するに従い上記厚さ方向に後退するように傾斜している。 The bottom surface facing the thickness direction of the concave portion 2A to which the cutting blade portion 3 is joined has a triangular shape that is substantially the same shape and the same size as the rake surface 3A of the cutting blade portion 3, as shown in FIG. As it moves away from the side surface 1C along the long side, it is slightly inclined so as to recede in the thickness direction. Accordingly, along with this, the rake face 3A and the outer peripheral edge 3C of the cutting edge portion 3 are inclined so as to recede in the thickness direction as they are separated from the side face 1C along the long side.
　なお、図２に示すように上記厚さ方向に第１の多角形面１Ａに対向する方向から見た平面視において、外周刃３Ｃは上記長手方向に延びる直線状をなしているのに対して、正面刃３Ｂは僅かに鈍角に一段折れ曲がった折れ線状をなしており、そのコーナ部Ｃに交差する部分が同平面視において外周刃３Ｃと略直交するように形成されている。また、正面刃３Ｂのコーナ部Ｃとは反対側の部分は、同平面視において上述のように傾斜した側面１Ｃに沿って延びている。 In addition, as shown in FIG. 2, in the plan view seen from the direction facing the first polygonal surface 1A in the thickness direction, the outer peripheral blade 3C has a linear shape extending in the longitudinal direction. The front blade 3B has a bent line shape that is slightly bent at an obtuse angle, and a portion intersecting the corner portion C is formed so as to be substantially orthogonal to the outer peripheral blade 3C in the same plan view. Moreover, the part on the opposite side to the corner part C of the front blade 3B is extended along the side surface 1C inclined as mentioned above in the same planar view.
　さらに、インサート本体１の上記側面１Ｃ、１Ｄのうち、これら正面刃３Ｂと外周刃３Ｃに連なる部分は、それぞれ正面刃３Ｂおよび外周刃３Ｃの逃げ面とされている。これらの逃げ面は、図３および図４に示すように第１の多角形面１Ａからインサート本体１裏側の、上記表裏の多角形面のうちの他方である第２の多角形面１Ｂに向かうに従い、インサート本体１の内側に僅かに後退するように傾斜しており、正面刃３Ｂと外周刃３Ｃに逃げ角が与えられるように形成されている。なお、側面１Ｃは、全体的にこのような逃げ角が与えられるように傾斜している。 Furthermore, of the side surfaces 1C and 1D of the insert body 1, the portions that are connected to the front blade 3B and the outer peripheral blade 3C are flank surfaces of the front blade 3B and the outer peripheral blade 3C, respectively. As shown in FIGS. 3 and 4, these flank surfaces go from the first polygonal surface 1 </ b> A to the second polygonal surface 1 </ b> B, which is the other of the front and back polygonal surfaces on the back side of the insert body 1. Accordingly, it is inclined so as to be slightly retracted to the inside of the insert main body 1, and is formed so that clearance angles are given to the front blade 3B and the outer peripheral blade 3C. The side surface 1C is inclined so that such a clearance angle is given as a whole.
　また、これらの側面１Ｃと側面１Ｄのうち外周刃３Ｃに連なる部分以外の、上記コーナ部Ｃの対角線上に位置するコーナ部に交差する第１の多角形面１Ａの長辺に連なる側面１Ｅと短辺に連なる側面１Ｆ、および側面１Ｄのうち短辺の延びる方向に後退した部分は、上記厚さ方向に延びる平坦面とされて、上記平面視においては図２に示したように隣接するもの同士で互いに垂直な方向に延びている。ただし、これら隣接する側面１Ｅ、１Ｆ、および側面１Ｄの後退した部分の交差稜線部は面取りされるとともに、第１の多角形面１Ａと側面１Ｅとの交差稜線部も面取りされている。 Further, the side surface 1E connected to the long side of the first polygonal surface 1A intersecting the corner portion located on the diagonal line of the corner portion C other than the portion connected to the outer peripheral blade 3C of the side surface 1C and the side surface 1D, and Of the side surface 1F and the side surface 1D that are continuous with the short side, a portion that is retreated in the direction in which the short side extends is a flat surface that extends in the thickness direction, and is adjacent in the plan view as shown in FIG. They extend in directions perpendicular to each other. However, the intersecting ridge line portions of the side surfaces 1E and 1F and the side surface 1D which are adjacent to each other are chamfered, and the intersecting ridge line portions between the first polygonal surface 1A and the side surface 1E are also chamfered.
　そして、切刃部３の上記すくい面３Ａを間にして第１の多角形面１Ａの上記コーナ部Ｃを臨む位置には、第１の多角形面１Ａから突出する堤状部４が、第１の多角形面１Ａに対向する方向から見てコーナ部Ｃに交差する第１の多角形面１Ａの上記２つの辺稜部に交差する方向に延びるように形成されている。従って、この堤状部４は、本実施形態では台金部２に形成され、特に上述のように超硬合金等の焼結合金よりなるこの台金部２に一体に形成されている。なお、堤状部４は、インサート本体１の上記厚さ方向に第１の多角形面１Ａに対向する方向から見て、コーナ部Ｃに交差する上記２つの辺稜部の二等分線に垂直な直線に対して±３０°の範囲で傾斜する方向に延びて該辺稜部に交差するように形成されるのが望ましい。 And in the position which faces the said corner part C of the 1st polygonal surface 1A in the said scoop surface 3A of the cutting blade part 3, the bank-like part 4 which protrudes from the 1st polygonal surface 1A is the 1st It is formed to extend in a direction intersecting the two side ridges of the first polygonal surface 1A that intersects the corner portion C as viewed from the direction facing the one polygonal surface 1A. Therefore, this bank-shaped part 4 is formed in the base metal part 2 in this embodiment, and is integrally formed in this base metal part 2 which consists of sintered alloys, such as a cemented carbide, as mentioned above especially. In addition, the bank-like portion 4 is a bisector of the two side ridge portions intersecting the corner portion C when viewed from the direction facing the first polygonal surface 1A in the thickness direction of the insert body 1. It is desirable that it is formed so as to extend in a direction inclined within a range of ± 30 ° with respect to a vertical straight line and intersect the side ridge portion.
　また、本実施形態の堤状部４は、該堤状部４が延びる方向に直交する断面が等脚台形状をなしており、すなわち第１の多角形面１Ａから突出するに従い互いに近づく一対の側面４Ａ、４Ｂと、堤状部４の突端にあって上記厚さ方向に垂直に延びる頂面４Ｃとを備えている。これにより、堤状部４の上記コーナ部Ｃを向く側面４Ａは、該コーナ部Ｃから離間するに従い第１の多角形面１Ａから突出する傾斜面とされる。 Moreover, the bank-shaped part 4 of this embodiment has a cross-section orthogonal to the direction in which the bank-shaped part 4 extends has an isosceles trapezoidal shape, that is, a pair that approaches each other as it protrudes from the first polygonal surface 1A. Side surfaces 4A and 4B, and a top surface 4C that is provided at the protruding end of the bank 4 and extends perpendicularly to the thickness direction. As a result, the side surface 4A of the bank-shaped portion 4 facing the corner portion C is an inclined surface that protrudes from the first polygonal surface 1A as the distance from the corner portion C increases.
　さらに、この堤状部４は、台金部２の凹部２Ａの上記底面から第１の多角形面１Ａに向けて立ち上がる該凹部２Ａの壁面に沿って延びており、第１の多角形面１Ａのコーナ部Ｃに交差する上記長辺には、段状をなすこの長辺の段差部に交差している。なお、この段差部に交差する堤状部４の端部は、段差部側に向かうに従い第２の多角形面１Ｂ側に向かって傾斜するように面取りされている。また、この堤状部４は、側面１Ｃには、上述のように傾斜した台金部２における該側面１Ｃにそのまま交差している。 Further, the bank-shaped portion 4 extends along the wall surface of the concave portion 2A rising from the bottom surface of the concave portion 2A of the base metal portion 2 toward the first polygonal surface 1A, and the first polygonal surface 1A. The long side that intersects with the corner portion C of the corner intersects the step portion of this long side that forms a step shape. In addition, the edge part of the bank-shaped part 4 which cross | intersects this level | step-difference part is chamfered so that it may incline toward the 2nd polygonal surface 1B side as it goes to the level | step-difference part side. Further, the bank portion 4 intersects the side surface 1C as it is with the side surface 1C of the base metal portion 2 inclined as described above.
　一方、この堤状部４からコーナ部Ｃとは反対側の第１の多角形面１Ａ上には、上記厚さ方向に垂直な平面部５が形成されている。言い換えれば、インサート本体１の上記厚さ方向は、この平面部５に垂直な方向である。また、正面刃３Ｂは、上記コーナ部Ｃに交差する部分が上記厚さ方向に垂直、すなわち平面部５に平行に延びており、特に本実施形態では平面部５の延長面上に位置するように配設されている。 On the other hand, a planar portion 5 perpendicular to the thickness direction is formed on the first polygonal surface 1A opposite to the corner portion C from the bank-shaped portion 4. In other words, the thickness direction of the insert body 1 is a direction perpendicular to the flat portion 5. Further, the front blade 3B has a portion intersecting with the corner portion C extending perpendicularly to the thickness direction, that is, parallel to the plane portion 5, and in particular in the present embodiment, located on the extended surface of the plane portion 5. It is arranged.
　これに対して、インサート本体１の上記第２の多角形面１Ｂには、第１の多角形面１Ａの切刃が設けられた辺稜部の裏側に位置する該第２の多角形面１Ｂの辺稜部に向かうに従い、上記平面部５に向けて近づくように傾斜する第１の傾斜平面６が形成されている。本実施形態では、上記切刃のうち外周刃３Ｃの裏側に位置する第２の多角形面１Ｂの辺稜部に向かうに従い、第１の傾斜平面６が平面部５に向けて近づくように傾斜しているとともに、第２の多角形面１Ｂの全体がこのような第１の傾斜平面６とされており、この第１の傾斜平面６は、平面部５と側面１Ｅに直交する断面（側面１Ｆに平行な断面）において平面部５に対して一定の傾斜角αをなすように形成されている。 On the other hand, the second polygonal surface 1B located on the back side of the side ridge portion where the cutting edge of the first polygonal surface 1A is provided on the second polygonal surface 1B of the insert body 1. A first inclined plane 6 that is inclined so as to approach the plane portion 5 is formed toward the side ridge portion. In the present embodiment, the first inclined flat surface 6 is inclined so as to approach the flat surface portion 5 toward the side ridge portion of the second polygonal surface 1B located on the back side of the outer peripheral blade 3C among the cutting blades. In addition, the entire second polygonal surface 1B is such a first inclined plane 6, and the first inclined plane 6 is a cross section (side surface) orthogonal to the plane portion 5 and the side surface 1E. (Cross section parallel to 1F) is formed so as to form a constant inclination angle α with respect to the plane portion 5.
　また、上記第１の多角形面１Ａには、これら平面部５と第１の傾斜平面６とに直交する断面、すなわち本実施形態では平面部５と側面１Ｅに直交する断面（側面１Ｆに平行な断面）において、上記平面部５に対する第１の傾斜平面６の傾斜の向きとは逆向きに傾斜する第２の傾斜平面７が形成されている。この第２の傾斜平面７も、上記断面において平面部５に対して一定の傾斜角βをなすように形成されており、この第２の傾斜平面７が平面部５に対してなす傾斜角βは、図１１に示すように第１の傾斜平面６が平面部５に対してなす傾斜角αよりも大きくされている。 The first polygonal surface 1A has a cross section orthogonal to the plane portion 5 and the first inclined plane 6, that is, a cross section orthogonal to the plane portion 5 and the side surface 1E in this embodiment (parallel to the side surface 1F). A second inclined plane 7 that is inclined in a direction opposite to the direction of inclination of the first inclined plane 6 with respect to the plane portion 5 is formed. The second inclined plane 7 is also formed so as to form a fixed inclination angle β with respect to the plane portion 5 in the cross section, and the inclination angle β formed by the second inclined plane 7 with respect to the plane portion 5. As shown in FIG. 11, the inclination angle α formed by the first inclined plane 6 with respect to the plane portion 5 is made larger.
　ここで、本実施形態では、第１の多角形面１Ａに凹所８が形成されており、第２の傾斜平面７はこの凹所８の底面に形成されている。凹所８は、平面部５の中央に、インサート本体１の上記長手方向、すなわち外周刃３Ｃが延びる方向に長く延びるように形成されていて、その平面部５から上記厚さ方向への深さが側面１Ｅ側から側面１Ｄ側に向かうに従い漸次深くなるように形成されることにより、該凹所８の底面である第２の傾斜平面７が第１の傾斜平面６の傾斜の向きと逆向きに傾斜するように形成される。 Here, in this embodiment, the recess 8 is formed in the first polygonal surface 1A, and the second inclined plane 7 is formed on the bottom surface of the recess 8. The recess 8 is formed in the center of the flat portion 5 so as to extend long in the longitudinal direction of the insert body 1, that is, in the direction in which the outer peripheral blade 3 </ b> C extends, and the depth in the thickness direction from the flat portion 5. Is formed so as to gradually become deeper from the side surface 1E side toward the side surface 1D side, whereby the second inclined plane 7 which is the bottom surface of the recess 8 is opposite to the inclination direction of the first inclined plane 6 It is formed so as to be inclined.
　また、凹所８は、その平面部５への開口部がＤ字状をなして平面部５上で１周する閉じた形状に形成されていて、すなわちインサート本体１の側面１Ｃ～１Ｆに開口してはおらず、底面である第２の傾斜平面７は側面１Ｅ側で平面部５と交差している。従って、凹所８には、側面１Ｃ、１Ｄ、１Ｆ側に第２の傾斜平面７から第１の多角形面１Ａの平面部５に向かう壁面８Ａ～８Ｃが形成されることになり、このうち側面１Ｆ側の壁面８Ｃは、上記断面に垂直な方向においてコーナ部Ｃとは反対側に位置することになる。 The recess 8 is formed in a closed shape in which the opening to the flat portion 5 forms a D-shape and makes one round on the flat portion 5, that is, opens to the side surfaces 1 C to 1 F of the insert body 1. However, the second inclined plane 7 which is the bottom surface intersects the plane portion 5 on the side surface 1E side. Accordingly, in the recess 8, wall surfaces 8A to 8C are formed on the side surfaces 1C, 1D, and 1F from the second inclined plane 7 toward the flat portion 5 of the first polygonal surface 1A. The wall surface 8C on the side surface 1F is located on the opposite side to the corner portion C in the direction perpendicular to the cross section.
　このように構成されたフライス用インサートが取り付けられる本実施形態の刃先交換式フライスは、軸線Ｏを中心とした概略円板状の工具本体１１を備え、この工具本体１１の先端部外周には、上記フライス用インサートが着脱可能に取り付けられるインサート取付座１２が形成されている。本実施形態の刃先交換式フライスは、このような工具本体１１がツールホルダ１３を介して工作機械の主軸に取り付けられ、軸線Ｏ回りに工具回転方向Ｔに高速回転されつつ該軸線Ｏに垂直な方向に送り出されることにより、上記フライス用インサートの切刃部３の主として正面刃３Ｂによって被削材に平面部を切削加工する、刃先交換式の正面フライスである。 The cutting edge exchange type milling cutter of the present embodiment to which the milling insert configured as described above is attached includes a substantially disc-shaped tool main body 11 centering on the axis O, and the outer periphery of the tip end portion of the tool main body 11 includes: An insert mounting seat 12 to which the milling insert is detachably mounted is formed. The tool tip 11 according to this embodiment has such a tool body 11 attached to a main spindle of a machine tool via a tool holder 13 and is perpendicular to the axis O while being rotated at high speed in the tool rotation direction T around the axis O. It is a blade-tip-replaceable type front milling machine that cuts a plane portion of a work material mainly by a front blade 3B of the cutting blade portion 3 of the above-mentioned milling insert by being fed in the direction.
　インサート取付座１２は、工具本体の１１の先端面と外周面とに開口して軸線Ｏ方向後端側に延びるスリット状に形成されており、工具回転方向Ｔ後方側を向く第１の取付座壁面１２Ａと、工具回転方向Ｔを向く第２の取付座壁面１２Ｂと、工具本体１１の内周側においてこれら第１、第２の取付座壁面１２Ａ、１２Ｂ間に位置して外周側を向く取付座底面１２Ｃとを備えている。本実施形態の刃先交換式フライスは、このようなインサート取付座１２が工具本体１１に２４箇所と多数、等間隔に形成された多刃の刃先交換式フライスでもある。 The insert mounting seat 12 is formed in a slit shape that opens to the front end surface and the outer peripheral surface of the tool body 11 and extends to the rear end side in the axis O direction, and is a first mounting seat that faces the rear side in the tool rotation direction T. Wall surface 12A, second mounting seat wall surface 12B facing the tool rotation direction T, and mounting on the inner peripheral side of the tool body 11 between the first and second mounting seat wall surfaces 12A, 12B and facing the outer peripheral side And a seat base 12C. The cutting edge exchange type milling cutter according to the present embodiment is also a multi-blade cutting edge exchangeable milling machine in which such insert mounting seats 12 are formed in the tool main body 11 at a large number of 24 positions at equal intervals.
　第１の取付座壁面１２Ａは、本実施形態では軸線Ｏを含む平面に沿って延びる平面状に形成されるとともに、取付座底面１２Ｃは、この第１の取付座壁面１２Ａと垂直に交差して軸線Ｏと平行に延びる平面状に形成されている。また、第２の取付座壁面１２Ｂは、軸線Ｏと平行で、工具本体１１の外周側に向かうに従い第１の取付座壁面１２Ａに近づくように傾斜する平面状に形成され、この第２の取付座壁面１２Ｂが第１の取付座壁面１２Ａに対してなす傾斜角は、図１１に示すように軸線Ｏに直交する断面において一定で、フライス用インサートの第１の傾斜平面６が平面部５に対してなす傾斜角αと等しくされている。 In the present embodiment, the first mounting seat wall surface 12A is formed in a planar shape extending along a plane including the axis O, and the mounting seat bottom surface 12C intersects the first mounting seat wall surface 12A perpendicularly. It is formed in a planar shape extending in parallel with the axis O. Further, the second mounting seat wall surface 12B is formed in a planar shape that is parallel to the axis O and is inclined so as to approach the first mounting seat wall surface 12A toward the outer peripheral side of the tool body 11. The inclination angle formed by the seat wall surface 12B with respect to the first mounting seat wall surface 12A is constant in the cross section orthogonal to the axis O as shown in FIG. The inclination angle α is equal to the inclination angle α.
　さらに、各インサート取付座１２の工具回転方向Ｔ側の工具本体１１外周面から第１の取付座壁面１２Ａにかけてはネジ孔１２Ｄが形成されており、このネジ孔１２Ｄにはインサート本体１を押圧して取り付けるための押圧手段としてのクランプネジ１４がねじ込まれている。このネジ孔１２Ｄは、その中心線に直交する平面が、やはり図１１に示すように軸線Ｏに直交する断面において一定の傾斜角で第１の取付座壁面１２Ａに交差して、工具本体１１の外周側に向かうに従い工具回転方向Ｔ後方側に延びるようにされており、この傾斜角はインサート本体１の第２の傾斜平面７が平面部５に対してなす傾斜角βと等しくされている。また、クランプネジ１４のインサート取付座１２側に向けられる先端面はネジ孔１２Ｄの上記中心線に直交する平面状とされている。 Further, a screw hole 12D is formed from the outer peripheral surface of the tool body 11 on the tool rotation direction T side of each insert mounting seat 12 to the first mounting seat wall surface 12A, and the insert body 1 is pressed into the screw hole 12D. A clamp screw 14 as a pressing means for attaching is attached. The screw hole 12D has a plane perpendicular to the center line intersecting the first mounting seat wall surface 12A at a constant inclination angle in a cross section perpendicular to the axis O as shown in FIG. As it goes to the outer peripheral side, it extends to the rear side in the tool rotation direction T, and this inclination angle is made equal to the inclination angle β formed by the second inclined plane 7 of the insert body 1 with respect to the plane portion 5. Moreover, the front end surface of the clamp screw 14 directed toward the insert mounting seat 12 is a flat surface perpendicular to the center line of the screw hole 12D.
　さらにまた、工具本体１１の先端部外周には、各インサート取付座１２の工具回転方向Ｔ側で、上記ネジ孔１２Ｄの外周面への開口部よりも先端側に、チップポケット１５が形成されている。このチップポケット１５は、本実施形態では、工具本体１１の先端面と外周面との交差稜線部を、工具回転方向Ｔ後方側に向かうに従い後端内周側に向けて幅広となる三角形面取り状に切り欠くようにして形成されている。 Furthermore, a tip pocket 15 is formed on the outer periphery of the distal end portion of the tool body 11 on the distal end side with respect to the outer peripheral surface of the screw hole 12D on the tool rotation direction T side of each insert mounting seat 12. Yes. In this embodiment, the tip pocket 15 has a triangular chamfered shape in which the crossed ridge line portion between the tip surface and the outer peripheral surface of the tool body 11 becomes wider toward the inner peripheral side of the rear end toward the rear side in the tool rotation direction T. It is formed so as to be cut out.
　また、こうして切り欠かれたチップポケット１５の三角形面取り状の底面１５Ａは、インサート取付座１２の第１の取付座壁面１２Ａに交差しており、従って、この第１の取付座壁面１２Ａと底面１５Ａとの交差稜線部は、工具本体１１の後端側に向かうに従い外周側に向かうように斜めに延びることになる。そして、この交差稜線部が軸線Ｏに垂直な平面に対してなす角度は、フライス用インサートの第１の多角形面１Ａに対向する方向から見て堤状部４が正面刃３Ｂに対してなす角度と等しくされている。また、この底面１５Ａと第１の取付座壁面１２Ａとの交差角は、インサート本体１の堤状部４のコーナ部Ｃとは反対側を向く側面４Ｂと平面部５との交差角と等しくされている。 Further, the triangular chamfered bottom surface 15A of the chip pocket 15 thus cut out intersects the first mounting seat wall surface 12A of the insert mounting seat 12, and therefore the first mounting seat wall surface 12A and the bottom surface 15A. The crossing ridge line portion extends obliquely toward the outer peripheral side toward the rear end side of the tool body 11. The angle formed by the intersecting ridge line portion with respect to the plane perpendicular to the axis O is formed by the bank-like portion 4 with respect to the front blade 3B when viewed from the direction facing the first polygonal surface 1A of the milling insert. Is equal to the angle. Further, the crossing angle between the bottom surface 15A and the first mounting seat wall surface 12A is made equal to the crossing angle between the side surface 4B facing the opposite side of the corner portion C of the bank portion 4 of the insert body 1 and the flat surface portion 5. ing.
　さらに、このチップポケット１５の底面１５Ａには、工具本体１１内に穿設されたクーラント孔１５Ｂが開口している。このクーラント孔１５Ｂは、工具本体１１内から上記ツールホルダ１３内の供給路を介して工作機械の主軸側に設けられたクーラント供給孔に連通しており、切削加工時には工作機械側から供給された切削油剤等のクーラントが、後述するようにインサート取付座１２に取り付けられたフライス用インサートの切刃部３のすくい面３Ａに向けて供給可能とされている。 Further, a coolant hole 15B drilled in the tool body 11 is opened on the bottom surface 15A of the chip pocket 15. The coolant hole 15B communicates with the coolant supply hole provided on the spindle side of the machine tool from the tool body 11 through the supply path in the tool holder 13, and is supplied from the machine tool side during cutting. A coolant such as a cutting fluid can be supplied toward the rake face 3A of the cutting blade portion 3 of the milling insert attached to the insert mounting seat 12 as will be described later.
　一方、各インサート取付座１２の後端側には、工具本体１１の外周面に開口して後端側に延びる凹溝１１Ａが形成されており、スリット状のインサート取付座１２の後端は、この凹溝１１Ａに開口していて、これらの凹溝１１Ａにはフライス用インサートのインサート本体１の軸線Ｏ方向の位置を調整する調整機構１６がそれぞれ備えられている。この調整機構１６は、図１０に示すように両端部にピッチが異なる第１、第２ネジ部１７Ａ、１７Ｂが同軸に形成されて、このうち第１ネジ部１７Ａが凹溝１１Ａの先端側を向く壁面に形成されたネジ孔に軸線Ｏと平行にねじ込まれる軸部材１７と、この軸部材１７の工具本体１１先端側に向けられた第２ネジ部１７Ｂにねじ込まれるナット部材１８とを備えている。 On the other hand, on the rear end side of each insert mounting seat 12, a concave groove 11A that opens to the outer peripheral surface of the tool body 11 and extends to the rear end side is formed, and the rear end of the slit-shaped insert mounting seat 12 is The concave grooves 11A are open, and each of the concave grooves 11A is provided with an adjusting mechanism 16 for adjusting the position of the insert body 1 of the milling insert in the direction of the axis O. As shown in FIG. 10, the adjusting mechanism 16 includes first and second screw portions 17A and 17B having different pitches at both ends, and the first screw portion 17A is located on the tip side of the groove 11A. A shaft member 17 that is screwed into a screw hole formed in the facing wall surface in parallel with the axis O, and a nut member 18 that is screwed into the second screw portion 17B facing the tip end side of the tool body 11 of the shaft member 17 are provided. Yes.
　ここで、本実施形態では、軸部材１７の第１ネジ部１７Ａのピッチが第２ネジ部１７Ｂのピッチよりも大きくされるとともに、ネジ径も第１ネジ部１７Ａが第２ネジ部１７Ｂより大きくされている。また、軸部材１７の第１、第２ネジ部１７Ａ、１７Ｂ間の外周面とナット部材１８の外周面には作業用工具が係止可能な被係止部１７Ｃ、１８Ａが形成されており、この被係止部１７Ｃ、１８Ａは本実施形態ではレンチ等が挿入可能な孔とされている。さらに、ナット部材１８の工具本体１１先端側に向けられる先端面１８Ｂは、この先端側に膨出する凸形状とされている。 Here, in the present embodiment, the pitch of the first screw portion 17A of the shaft member 17 is made larger than the pitch of the second screw portion 17B, and the screw diameter of the first screw portion 17A is larger than that of the second screw portion 17B. Has been. In addition, on the outer peripheral surface between the first and second screw portions 17A and 17B of the shaft member 17 and the outer peripheral surface of the nut member 18, locked portions 17C and 18A capable of locking the work tool are formed, In this embodiment, the locked portions 17C and 18A are holes through which a wrench or the like can be inserted. Further, the tip surface 18B of the nut member 18 directed toward the tip side of the tool body 11 has a convex shape that bulges toward the tip side.
　このように構成された刃先交換式フライスの工具本体１１に、上記フライス用インサートは、そのインサート本体１の第１の多角形面１Ａおよび切刃部３のすくい面３Ａを工具回転方向Ｔに向けるとともに、側面１Ｃを工具本体１１の先端側に、側面１Ｄを外周側に向けて、工具本体１１先端側からインサート取付座１２に挿入される。ここで、インサート取付座１２の第１、第２の取付座壁面１２Ａ、１２Ｂ間の間隔は、インサート本体１の側面１Ｅを取付座底面１２Ｃに密着させた状態で、第１の多角形面１Ａの平面部５と第２の多角形面１Ｂ（第１の傾斜平面６）がこれら第１、第２の取付座壁面１２Ａ、１２Ｂに対向して摺接しながら、インサート本体１を挿入可能な大きさとされている。 The milling insert has the first polygonal surface 1A of the insert main body 1 and the rake face 3A of the cutting edge portion 3 directed in the tool rotation direction T on the tool main body 11 of the blade-tip-exchangeable milling machine configured as described above. At the same time, the side surface 1C is inserted into the insert mounting seat 12 from the front end side of the tool main body 11 with the side surface 1C facing the front end side of the tool main body 11 and the side surface 1D facing the outer peripheral side. Here, the interval between the first and second mounting seat wall surfaces 12A and 12B of the insert mounting seat 12 is such that the side surface 1E of the insert body 1 is in close contact with the mounting seat bottom surface 12C, and the first polygonal surface 1A. The insert body 1 can be inserted while the flat portion 5 and the second polygonal surface 1B (first inclined plane 6) are in sliding contact with the first and second mounting seat wall surfaces 12A and 12B. It is said.
　また、工具本体１１の外周面から取付座底面１２Ｃまでのインサート取付座１２の径方向の深さは、こうしてインサート本体１の側面１Ｅを取付座底面１２Ｃに密着させた状態で、工具本体１１の外周側に向けられた切刃部３の外周刃３Ｃが外周面から突出する大きさとされている。そして、このようにインサート取付座１２に挿入されたインサート本体１の側面１Ｆが上記調整機構１６のナット部材１８の先端面１８Ｂに当接したところで、インサート本体１は位置決めされて着座させられ、次いでネジ孔１２Ｄにクランプネジ１４をねじ込んで、インサート本体１の凹所８の底面である第２の傾斜平面７がクランプネジ１４の先端面によって垂直に押圧されることにより、インサート本体１が工具本体１１に固定される。 Further, the radial depth of the insert mounting seat 12 from the outer peripheral surface of the tool body 11 to the mounting seat bottom surface 12C is such that the side surface 1E of the insert body 1 is in close contact with the mounting seat bottom surface 12C. The outer peripheral blade 3C of the cutting blade portion 3 directed to the outer peripheral side has a size protruding from the outer peripheral surface. Then, when the side surface 1F of the insert body 1 thus inserted into the insert mounting seat 12 abuts on the front end surface 18B of the nut member 18 of the adjusting mechanism 16, the insert body 1 is positioned and seated, and then When the clamp screw 14 is screwed into the screw hole 12D and the second inclined plane 7 which is the bottom surface of the recess 8 of the insert body 1 is pressed vertically by the tip surface of the clamp screw 14, the insert body 1 is moved to the tool body. 11 is fixed.
　このように固定された状態で、各インサート取付座１２に取り付けられたフライス用インサートの切刃部３の正面刃３Ｂは、工具本体１１の先端面から突出して軸線Ｏに垂直な１つの平面上に位置するように、上記調整機構１６によって軸線Ｏ方向の位置が調整される。すなわち、本実施形態の調整機構１６においては、被係止部１７Ｃ、１８Ａに作業用工具を係止して軸部材１７とナット部材１８を回転し、軸部材１７の第１ネジ部１７Ａの工具本体１１へのねじ込み量と、第２ネジ部１７Ｂへのナット部材１８のねじ込み量とを調整することにより、ナット部材１８の先端面１８Ｂの軸線Ｏ方向の位置が設定されるので、この先端面１８Ｂの位置を各インサート取付座１２に備えられた調整機構１６によって適宜設定することにより、正面刃３Ｂの位置も上述のように調整することができる。 In this fixed state, the front blade 3B of the cutting blade portion 3 of the milling insert attached to each insert mounting seat 12 protrudes from the front end surface of the tool body 11 on a single plane perpendicular to the axis O. The position in the direction of the axis O is adjusted by the adjusting mechanism 16 so as to be positioned at the position. That is, in the adjustment mechanism 16 of the present embodiment, the working tool is locked to the locked portions 17C and 18A, the shaft member 17 and the nut member 18 are rotated, and the tool of the first screw portion 17A of the shaft member 17 is rotated. By adjusting the screwing amount into the main body 11 and the screwing amount of the nut member 18 into the second screw portion 17B, the position of the tip surface 18B of the nut member 18 in the direction of the axis O is set. By appropriately setting the position of 18B by the adjusting mechanism 16 provided in each insert mounting seat 12, the position of the front blade 3B can also be adjusted as described above.
　そして、こうして正面刃３Ｂの位置が調整されたフライス用インサートにおいては、第１の多角形面１Ａに対向する方向から見て堤状部４が正面刃３Ｂに対してなす角度と、インサート取付座１２の第１の取付座壁面１２Ａとチップポケット１５の底面１５Ａとの交差稜線部が軸線Ｏに垂直な平面に対してなす角度と等しくされていることから、この堤状部４が上記交差稜線部に沿って平行に、工具本体１１の後端側に向かうに従い外周側に向けて延びるように配置されることになる。なお、堤状部４は、そのコーナ部Ｃと反対側を向く側面４Ｂが、チップポケット１５の底面１５Ａと密着していてもよく、また間隔をあけていてもよい。 In the milling insert in which the position of the front blade 3B is adjusted in this way, the angle formed by the bank 4 with respect to the front blade 3B when viewed from the direction facing the first polygonal surface 1A, and the insert mounting seat Since the intersecting ridge line portion between the first mounting seat wall surface 12A and the bottom surface 15A of the chip pocket 15 is made equal to the angle perpendicular to the plane perpendicular to the axis O, the bank-like portion 4 is It is arranged so as to extend toward the outer peripheral side as it goes toward the rear end side of the tool body 11 in parallel along the part. The bank 4 may have a side surface 4B facing the corner C opposite to the bottom surface 15A of the chip pocket 15 and may be spaced apart.
　このようにフライス用インサートが取り付けられた刃先交換式フライスを高速回転させて切削加工を行うと、特に切刃部３の主として正面刃３Ｂによって平面部を切削加工する刃先交換式正面フライスである本実施形態では、この正面刃３Ｂにより生成された切屑がすくい面３Ａに沿って工具本体１１の後端側に高速で流出することになる。そして、この切屑が流出する正面刃３Ｂの後端側には、コーナ部Ｃに交差する正面刃３Ｂと外周刃３Ｃが形成された第１の多角形面１Ａの２つの辺稜部に交差するように上記堤状部４が延びており、本実施形態では切屑は、この堤状部４に案内されるようにして工具本体１１の後端外周側に排出されることになる。 In this way, when cutting is performed by rotating the blade-tip-exchangeable mill to which the insert for milling is attached at a high speed, this is a blade-tip-exchangeable face mill that cuts the flat portion mainly by the front blade 3B of the cutting blade portion 3 in particular. In the embodiment, chips generated by the front blade 3B flow out to the rear end side of the tool body 11 at high speed along the rake face 3A. Then, on the rear end side of the front blade 3B from which the chips flow out, the front blade 3B intersecting the corner portion C and the two side ridge portions of the first polygonal surface 1A formed with the outer peripheral blade 3C are intersected. In this embodiment, the chips are discharged to the outer peripheral side of the rear end of the tool body 11 as guided by the bank 4.
　従って、本実施形態によれば、切屑がチップポケット１５の底面１５Ａに摺接することが避けられ、高速で流出する切屑の摺接によって摩耗が促進されて工具本体１１が損傷するのを防ぐことができる。また、切刃部３の主として外周刃３Ｃによって比較的大きな切り込みで被削材に壁面部を切削加工するような場合に、切屑は外周刃３Ｃから工具本体１１の内周側に流出することになるが、このような場合でも切屑の流出方向には堤状部４が延びることになり、この堤状部４に乗り上げることにより切屑は底面１５Ａと間隔をあけるようにして排出されるため、やはり工具本体１１の損傷を抑えることが可能となる。 Therefore, according to the present embodiment, it is avoided that the chips come into sliding contact with the bottom surface 15A of the chip pocket 15, and it is possible to prevent the tool body 11 from being damaged due to accelerated wear due to sliding contact of the chips flowing out at high speed. it can. In addition, when the wall surface is cut into the work material with a relatively large depth of cut mainly by the outer peripheral edge 3C of the cutting edge 3, the chips flow out from the outer peripheral edge 3C to the inner peripheral side of the tool body 11. However, even in such a case, the bank 4 extends in the direction of chip discharge, and the chips are discharged so as to be spaced from the bottom surface 15A by riding on the bank 4. It becomes possible to suppress damage to the tool body 11.
　そして、こうしてチップポケット１５の摩耗による工具本体１１の損傷を防止する堤状部４が、工具本体１１ではなくフライス用インサートのインサート本体１に設けられているので、このようなフライス用インサートを取り付けた刃先交換式フライスでは、チップポケット１５自体にパッドや保護具を取り付ける場合のように取り付け用のスペースを必要とすることがない。このため、工具本体１１の周方向に隣接するインサート取付座１２の間隔を小さくしてその数を増やすことができるので、１つの工具本体１１に取付可能なフライス用インサートの数も増やして上述のように多刃化を図ることができ、高速切削加工と併せてさらなる加工効率の向上を促すことが可能となる。 And since the embankment part 4 which prevents the damage of the tool main body 11 by abrasion of the tip pocket 15 in this way is provided not in the tool main body 11 but in the insert main body 1 of the milling insert, such an insert for milling is attached. In addition, the cutting edge-changing milling cutter does not require a space for attachment as in the case of attaching a pad or a protector to the chip pocket 15 itself. For this reason, since the number of the insert mounting seats 12 adjacent in the circumferential direction of the tool body 11 can be reduced and the number thereof can be increased, the number of milling inserts that can be attached to one tool body 11 is also increased. Thus, it is possible to increase the number of blades, and it is possible to promote further improvement in processing efficiency together with high-speed cutting.
　また、本実施形態のフライス用インサートでは、インサート本体１が、超硬合金等の硬質焼結合金よりなる台金部２に、ダイヤモンド焼結体やｃＢＮ焼結体等の高硬度な超高圧焼結体よりなる切刃部３が接合されて形成されており、堤状部４はこのうちの台金部２に一体に形成されている。このため、切刃部３の寿命を確保しつつ、堤状部４に案内されたり乗り上げたりすることによって切屑が接触しても、堤状部４自体が摩耗するのを抑制することができて、インサート本体１の寿命が費えるまで確実に工具本体１１の損傷を防止することができるとともに、台金部２に製造される圧粉体を焼結合金の原料粉末からプレス成形によって成形する際に堤状部４も一体に成形できるので、上述のような効果を奏するフライス用インサートの製造を簡略化することもできる。ただし、インサート本体１は切刃部３を含めた全体が超硬合金等の硬質焼結合金によって形成されていてもよい。 Further, in the milling insert of the present embodiment, the insert body 1 is placed on the base metal part 2 made of a hard sintered alloy such as a cemented carbide alloy, and the high hardness ultrahigh pressure firing such as a diamond sintered body or a cBN sintered body. A cutting blade portion 3 made of a bonded body is joined and formed, and the bank-like portion 4 is formed integrally with the base metal portion 2. For this reason, it is possible to prevent the bank-shaped part 4 itself from being worn even if chips are brought into contact with the bank-shaped part 4 by being guided or climbed up while securing the life of the cutting blade part 3. The tool body 11 can be reliably prevented from being damaged until the life of the insert body 1 is consumed, and the green compact produced on the base metal part 2 is formed from a sintered alloy raw material powder by press molding. Moreover, since the bank-shaped part 4 can also be shape | molded integrally, manufacture of the insert for milling which has the above effects can also be simplified. However, the entire insert body 1 including the cutting edge portion 3 may be formed of a hard sintered alloy such as cemented carbide.
　さらに、本実施形態では、流出した切屑が接触することになる、切刃部３のコーナ部Ｃ側を向く堤状部４の側面４Ａが、このコーナ部Ｃから離間するに従い第１の多角形面１Ａから突出する傾斜面とされており、これにより切屑の接触による抵抗を低減することができる。従って、このような切屑の接触による堤状部４の摩耗を一層確実に抑制するとともに、工具本体１１を高速回転させるときの回転駆動力が必要以上に大きくなるのも防ぐことができる。なお、側面４Ａはインサート本体１の厚さ方向に延びていてもよいが、この厚さ方向に対する側面４Ａの傾斜が大きくなりすぎると切屑を確実に案内したりすることができなくなるおそれがあるので、厚さ方向に対して０°～４５°の傾斜とされるのが望ましい。また、同様に、堤状部４の厚さ方向の突出高さは、例えば正面刃３Ｂからの突出高さとして０．５ｍｍ～２．０ｍｍ程度とされるのが望ましい。 Further, in the present embodiment, the side face 4A of the bank-shaped portion 4 facing the corner portion C side of the cutting edge portion 3 that comes into contact with the outflowing chips is separated from the corner portion C as the first polygonal shape. It is set as the inclined surface which protrudes from the surface 1A, and can reduce the resistance by the contact of chips. Accordingly, it is possible to more reliably suppress the wear of the bank-shaped portion 4 due to such chip contact, and to prevent the rotational driving force when the tool body 11 is rotated at a high speed from becoming unnecessarily large. The side surface 4A may extend in the thickness direction of the insert body 1, but if the inclination of the side surface 4A with respect to the thickness direction becomes too large, the chips may not be reliably guided. The inclination is preferably 0 ° to 45 ° with respect to the thickness direction. Similarly, the protruding height of the bank-shaped portion 4 in the thickness direction is preferably about 0.5 mm to 2.0 mm as the protruding height from the front blade 3B, for example.
　さらにまた、本実施形態の刃先交換式フライスでは、フライス用インサートにこのような堤状部４が形成されることにより、インサート本体１の平面部５とインサート取付座１２の第１の取付座壁面１２Ａとの間に、切屑は勿論、微細な切粉などのゴミなどが進入するのも防止することができる。また、工具本体を工作機械から取り外して正面刃３Ｂの軸線Ｏ方向の位置を揃えるプリセット作業時に、工具本体１１の先端面を上向きにしてインサート本体１をインサート取付座１２に挿入すると、堤状部４が第１の取付座壁面１２Ａとチップポケット１５の底面１５Ａとの交差稜線部に当接したところでインサート本体１が簡易的に位置決めされるので、この状態から調整機構１６によってインサート本体１の位置を微調整することにより、プリセット時間の短縮を図ることもできる。 Furthermore, in the cutting edge-exchangeable milling machine according to the present embodiment, such a bank-like part 4 is formed in the milling insert, whereby the flat surface part 5 of the insert body 1 and the first mounting seat wall surface of the insert mounting seat 12 are formed. It is possible to prevent not only chips but also dust such as fine chips from entering between 12A. Further, when the insert body 1 is inserted into the insert mounting seat 12 with the tip surface of the tool body 11 facing upward at the time of the preset operation of removing the tool body from the machine tool and aligning the position of the front blade 3B in the axis O direction, Since the insert main body 1 is simply positioned when 4 abuts the intersecting ridge line portion between the first mounting seat wall surface 12A and the bottom surface 15A of the chip pocket 15, the position of the insert main body 1 is adjusted by the adjusting mechanism 16 from this state. The preset time can be shortened by finely adjusting.
　一方、本実施形態のフライス用インサートでは、インサート本体１が表裏に第１、第２の多角形面１Ａ、１Ｂを有し、第１の多角形面１Ａには平面部５が設けられるとともに、第２の多角形面１Ｂには、外周刃３Ｃの裏側に位置する辺稜部に向かうに従い平面部５に向けて近づくように傾斜する第１の傾斜平面６が形成され、第１の多角形面１Ａにはさらに、平面部５と第１の傾斜平面６とに直交する断面において平面部５に対する第１の傾斜平面６の傾斜の向きとは逆向きに傾斜する第２の傾斜平面７が形成されている。 On the other hand, in the milling insert of the present embodiment, the insert body 1 has first and second polygonal surfaces 1A and 1B on the front and back sides, and the first polygonal surface 1A is provided with a flat surface portion 5; The second polygonal surface 1B is formed with a first inclined plane 6 that is inclined so as to approach the plane portion 5 toward the side ridge portion located on the back side of the outer peripheral blade 3C. The surface 1A further includes a second inclined plane 7 that is inclined in a direction opposite to the direction of inclination of the first inclined plane 6 with respect to the plane section 5 in a cross section orthogonal to the plane section 5 and the first inclined plane 6. Is formed.
　また、このようなフライス用インサートが取り付けられる刃先交換式フライスのインサート取付座１２は、工具回転方向Ｔ後方側を向いて上記第１の多角形面１Ａの平面部５と対向する第１の取付座壁面１２Ａと、工具回転方向Ｔを向いて上記第１の傾斜平面６が密着する第２の取付座壁面１２Ｂと、これら第１、第２の取付座壁面１２Ａ、１２Ｂ間に延びる取付座底面１２Ｃとを備えている。そして、このようなインサート取付座１２に、上記フライス用インサートは、外周刃３Ｃを工具本体１１の外周側に向けるとともに切刃部３のすくい面３Ａを工具回転方向Ｔに向けて着座させられた上で、押圧手段としてのクランプネジ１４によって第２の傾斜平面７を押圧することにより取り付けられている。 Further, the insert mounting seat 12 of the cutting edge-exchangeable mill to which such a milling insert is mounted is a first mounting facing the flat portion 5 of the first polygonal surface 1A facing the tool rotation direction T rear side. 12 A of seat wall surfaces, the 2nd mounting seat wall surface 12B to which the said 1st inclined plane 6 closely_contact | adheres to the tool rotation direction T, and the mounting seat bottom surface extended between these 1st, 2nd mounting seat wall surface 12A, 12B 12C. Then, on the insert mounting seat 12, the milling insert is seated with the outer peripheral blade 3 </ b> C facing the outer peripheral side of the tool body 11 and the rake face 3 </ b> A of the cutting blade portion 3 facing the tool rotation direction T. Above, it attaches by pressing the 2nd inclined plane 7 with the clamp screw 14 as a press means.
　従って、インサート本体１の平面部５と第１の傾斜平面６との間隔と、インサート取付座１２の第１、第２の取付座壁面１２Ａ、１２Ｂ間の間隔が、工具本体１１の外周側に向かうに従い漸次小さくなるのに加えて、これらの面が上記断面においてなす交差角よりも大きな交差角をなすようにして、第１、第２の傾斜平面６、７間の間隔も工具本体１１の外周側に向かうに従い小さくなる。このため、インサート本体１を強固にインサート取付座１２に取り付けることができ、上述のように工具本体１１を高速回転させて切削加工を行っても、遠心力によってインサート本体１が工具本体１１の外周側にずれ動いたり脱落したりしてしまうのを防ぐことができる。 Therefore, the distance between the flat portion 5 of the insert body 1 and the first inclined plane 6 and the distance between the first and second mounting seat wall surfaces 12A and 12B of the insert mounting seat 12 are on the outer peripheral side of the tool body 11. In addition to being gradually reduced as it goes, these surfaces form an intersecting angle larger than the intersecting angle formed in the cross section, so that the distance between the first and second inclined planes 6 and 7 is also different from that of the tool body 11. It becomes smaller as it goes to the outer peripheral side. For this reason, the insert body 1 can be firmly attached to the insert mounting seat 12, and even if the tool body 11 is rotated at a high speed as described above and the cutting process is performed, the insert body 1 is moved to the outer periphery of the tool body 11 by centrifugal force. It can be prevented from moving to the side or falling off.
　さらに、本実施形態では、平面部５と第１の傾斜平面６とに直交する断面において、第２の傾斜平面７が平面部５に対してなす傾斜角βが、第１の傾斜平面６が平面部５に対してなす傾斜角αよりも大きくされている。このため、同断面における平面部５と第１の傾斜平面６との交差角よりも第１、第２の傾斜平面６、７の交差角を一層大きなものとすることができるので、さらに確実にインサート本体１のずれや脱落を防止することが可能となる。 Further, in the present embodiment, in the cross section orthogonal to the plane portion 5 and the first inclined plane 6, the inclination angle β formed by the second inclined plane 7 with respect to the plane portion 5 is the first inclined plane 6. It is made larger than the inclination angle α formed with respect to the flat portion 5. For this reason, since the crossing angle of the first and second inclined planes 6 and 7 can be made larger than the crossing angle of the plane portion 5 and the first inclined plane 6 in the same cross section, it is more sure. It is possible to prevent the insert body 1 from being displaced or dropped out.
　また、本実施形態では、第１の多角形面１Ａに凹所８が形成されており、この凹所８の底面に第２の傾斜平面７が形成されている。この点、例えば第１の多角形面１Ａの平面部５に凸部を形成し、この凸部の突端面を上記断面において平面部５に対する第１の傾斜平面６の傾斜の向きとは逆向きに傾斜する第２の傾斜平面とすることも可能であるが、このような場合には、インサート本体１を工具本体１１の先端側から挿入するために、この凸部が挿通可能な凹溝をインサート取付座１２の第１の取付座壁面１２Ａに形成しなければならなくなり、隣接するインサート取付座１２間の間隔を狭めることができなくなるおそれがあるのに対し、本実施形態ではそのような凹溝を形成する必要が無く、確実にインサート取付座１２間の間隔を小さくして刃先交換式フライスの多刃化を図ることが可能となる。 Further, in the present embodiment, a recess 8 is formed in the first polygonal surface 1A, and a second inclined plane 7 is formed on the bottom surface of the recess 8. In this respect, for example, a convex portion is formed on the flat portion 5 of the first polygonal surface 1A, and the protruding end surface of the convex portion is opposite to the inclination direction of the first inclined plane 6 with respect to the flat portion 5 in the cross section. However, in such a case, in order to insert the insert body 1 from the distal end side of the tool body 11, a concave groove through which this convex portion can be inserted is provided. The insert mounting seat 12 must be formed on the first mounting seat wall surface 12A, and there is a possibility that the interval between the adjacent insert mounting seats 12 cannot be reduced. There is no need to form a groove, and it is possible to reliably reduce the distance between the insert mounting seats 12 and increase the number of blades of the blade-tip replaceable milling cutter.
　しかも、本実施形態では、この凹所８の第１の多角形面１Ａ（平面部５）への開口部が平面部５上で１周する閉じた形状に形成されていて、インサート本体１の側面１Ｃ～１Ｆに開口してはおらず、これに伴い、上記断面に垂直な方向においてコーナ部Ｃとは反対側には、この凹所８の底面である第２の傾斜平面７から上記第１の多角形面１Ａに向かう壁面８Ｃが形成されることになる。このため、例えば工具本体１１の先端面を下向きにしてクランプネジ１４を緩めても、クランプネジ１４が凹所８から抜け出るまでは壁面８Ｃがクランプネジ１４の先端部に当たるため、インサート本体１がインサート取付座１２から落下するのを防ぐことができ、落下によるインサート本体１の破損や紛失を防止することができる。 In addition, in the present embodiment, the opening to the first polygonal surface 1A (plane portion 5) of the recess 8 is formed in a closed shape that makes one round on the plane portion 5, and the insert body 1 The side surfaces 1C to 1F are not open, and accordingly, the first inclined plane 7 which is the bottom surface of the recess 8 is provided on the side opposite to the corner portion C in the direction perpendicular to the cross section. A wall surface 8C directed to the polygonal surface 1A is formed. For this reason, for example, even if the clamp screw 14 is loosened with the tip surface of the tool body 11 facing downward, the wall surface 8C hits the tip of the clamp screw 14 until the clamp screw 14 comes out of the recess 8, so that the insert body 1 is inserted into the insert body 1. It can prevent falling from the mounting seat 12, and can prevent damage or loss of the insert body 1 due to dropping.
　また、この凹所８は、本実施形態では、長方形板状をなすインサート本体１の長手方向すなわち直線状の外周刃３Ｃが延びる方向に長く延びるように形成されており、例えば正面刃３Ｂに摩耗が生じたときに、インサート本体１の側面１Ｃを再研磨して正面刃３Ｂを研ぎ付け直しても、この凹所８が延びる範囲においては、上記調整機構１６によってインサート本体１の軸線Ｏ方向の位置を調整した上で、クランプネジ１４によりインサート本体１を固定することができる。このため、特に本実施形態のように切刃部３が高価な超高圧焼結体よりなるフライス用インサートにおいては、インサート寿命を延ばして資源の有効利用を図ることが可能となる。 Further, in this embodiment, the recess 8 is formed so as to extend long in the longitudinal direction of the insert body 1 having a rectangular plate shape, that is, in the direction in which the linear outer peripheral blade 3C extends. Even if the side surface 1C of the insert body 1 is re-polished and the front blade 3B is sharpened again, the adjustment mechanism 16 causes the insert body 1 to move in the direction of the axis O in the range in which the recess 8 extends. The insert body 1 can be fixed by the clamp screw 14 after adjusting the position. For this reason, particularly in the milling insert in which the cutting edge portion 3 is made of an expensive ultra-high pressure sintered body as in the present embodiment, it is possible to extend the insert life and effectively use resources.
　さらに、本実施形態の刃先交換式フライスは上述のような多刃のフライスであって、周方向に隣接するインサート取付座１２間の間隔が小さくされており、１つのインサート取付座１２の上記クランプネジ１４がねじ込まれるネジ孔１２Ｄと、このインサート取付座１２の工具回転方向Ｔに隣接するインサート取付座１２との間隔も小さくなる。すると、クランプネジ１４をねじ込んでインサート本体１を固定する際に、その反力によってインサート取付座１２間で工具本体１１が微小に弾性変形し、工具回転方向Ｔに隣接したインサート取付座１２に取り付けられたインサート本体１を工具回転方向Ｔ側に押し付ける作用が発生するので、一層安定してフライス用インサートを取り付けることができるとともに、クランプネジ１４の径を小さくすることもできるので、さらに確実な多刃化を図ることが可能となる。 Furthermore, the cutting edge exchange type milling cutter of the present embodiment is a multi-blade milling cutter as described above, in which the interval between the insert mounting seats 12 adjacent in the circumferential direction is reduced, and the clamp of one insert mounting seat 12 is The interval between the screw hole 12D into which the screw 14 is screwed and the insert mounting seat 12 adjacent to the tool mounting direction T of the insert mounting seat 12 is also reduced. Then, when the insert body 1 is fixed by screwing the clamp screw 14, the tool body 11 is slightly elastically deformed between the insert mounting seats 12 due to the reaction force, and is attached to the insert mounting seat 12 adjacent to the tool rotation direction T. Since the action of pressing the inserted insert body 1 in the tool rotation direction T side occurs, the milling insert can be attached more stably, and the diameter of the clamp screw 14 can be reduced. It is possible to achieve cutting.
　１　インサート本体
　１Ａ　インサート本体１の第１の多角形面
　１Ｂ　インサート本体１の第２の多角形面
　１Ｃ～１Ｆ　インサート本体１の側面
　２　台金部
　３　切刃部
　３Ａ　すくい面
　３Ｂ　正面刃（切刃）
　３Ｃ　外周刃（切刃）
　４　堤状部
　４Ａ　堤状部４のコーナ部Ｃ側を向く側面
　５　平面部
　６　第１の傾斜平面
　７　第２の傾斜平面
　８　凹所
　８Ｃ　凹所８のコーナ部Ｃとは反対側の壁面
　１１　工具本体
　１２　インサート取付座
　１２Ａ　第１の取付座壁面
　１２Ｂ　第２の取付座壁面
　１２Ｃ　取付座底面
　１４　クランプネジ（押圧手段）
　１５　チップポケット
　１５Ａ　チップポケット１５の底面
　１６　調整機構
　Ｃ　第１の多角形面１Ａのコーナ部
　Ｏ　工具本体１１の軸線
　Ｔ　工具回転方向
　α　第１の傾斜平面６が平面部５に対してなす傾斜角
　β　第２の傾斜平面７が平面部５に対してなす傾斜角 DESCRIPTION OF SYMBOLS 1 Insert main body 1A 1st polygon surface of insert main body 1B 2nd polygon surface of insert main body 1C-1F Side surface of insert main body 2 Base metal part 3 Cutting edge part 3A Rake face 3B Front edge (cutting edge )
3C Peripheral edge (cutting edge)
4 Bank-shaped part 4A Side surface of bank-shaped part 4 facing the corner part C side 5 Plane part 6 First inclined plane 7 Second inclined plane 8 Recess 8C Wall 11 opposite to the corner 8 of the recess 8 Tool body 12 Insert mounting seat 12A First mounting seat wall surface 12B Second mounting seat wall surface 12C Mounting seat bottom surface 14 Clamp screw (pressing means)
15 Chip pocket 15A Bottom surface of chip pocket 15 16 Adjustment mechanism C Corner portion of first polygonal surface 1A O Tool body 11 axis T Tool rotation direction α Inclination angle formed by first inclined plane 6 with respect to flat portion 5 β Inclination angle formed by the second inclined plane 7 with respect to the plane portion 5

Claims (5)

  1. 　軸線回りに回転させられる刃先交換式フライスの工具本体先端外周部に形成されたインサート取付座に着脱可能に取り付けられるフライス用インサートであって、
    　多角形板状のインサート本体を備え、
    　このインサート本体の多角形面のコーナ部に、該多角形面上にすくい面を有する切刃部が設けられているとともに、
    　この切刃部の上記すくい面を間にして上記多角形面の上記コーナ部を臨む位置には、該多角形面から突出する堤状部が、この多角形面に対向する方向から見て上記コーナ部に交差する該多角形面の２つの辺稜部に交差する方向に延びるように形成されていることを特徴とするフライス用インサート。     An insert for milling that is detachably attached to an insert mounting seat formed on the outer periphery of the tool body tip of a tool tip changeable milling cutter that is rotated around an axis,
    It has a polygonal plate-like insert body,
    The corner portion of the polygonal surface of the insert body is provided with a cutting edge portion having a rake face on the polygonal surface,
    At the position facing the corner portion of the polygonal surface with the rake face of the cutting edge in between, the bank-like portion protruding from the polygonal surface is viewed from the direction facing the polygonal surface. An insert for milling, characterized in that it is formed so as to extend in a direction intersecting two side ridges of the polygonal surface intersecting the corner.
  2. 　上記インサート本体は、焼結合金よりなる台金部に、この台金部よりも高硬度の超高圧焼結体よりなる上記切刃部が接合されて形成されており、上記堤状部は、上記台金部に一体に形成されていることを特徴とする請求項１に記載のフライス用インサート。 The insert body is formed by joining a base metal part made of a sintered alloy to the cutting edge part made of an ultra-high pressure sintered body having a hardness higher than that of the base metal part. The milling insert according to claim 1, wherein the milling insert is formed integrally with the base metal part.
  3. 　上記堤状部の上記コーナ部を向く側面は、該コーナ部から離間するに従い上記多角形面から突出する傾斜面とされていることを特徴とする請求項１または請求項２に記載のフライス用インサート。 3. The milling machine according to claim 1, wherein a side surface of the bank-shaped portion facing the corner portion is an inclined surface protruding from the polygonal surface as the distance from the corner portion increases. insert.
  4. 　軸線回りに回転させられる工具本体の先端部外周に形成されたインサート取付座に、請求項１から請求項３のうちいずれか一項に記載のフライス用インサートが着脱可能に取り付けられた刃先交換式フライスであって、
    　上記工具本体の先端部外周には、上記インサート取付座の工具回転方向側に開口するチップポケットが形成されるとともに、
    　上記インサート取付座は、工具回転方向後方側を向いて上記インサート本体の上記多角形面と対向する取付座壁面を備え、
    　上記フライス用インサートは、上記コーナ部を上記工具本体の先端外周側に突出させるとともに、上記切刃部のすくい面を工具回転方向に向けて、上記堤状部が上記チップポケットの底面と上記取付座壁面との交差稜線部に沿って延びるように取り付けられることを特徴とする刃先交換式フライス。     The blade tip replaceable type in which the insert for milling according to any one of claims 1 to 3 is detachably attached to an insert mounting seat formed on an outer periphery of a tip end of a tool body rotated around an axis. Milling,
    A tip pocket that is open on the tool rotation direction side of the insert mounting seat is formed on the outer periphery of the tip of the tool body,
    The insert mounting seat includes a mounting seat wall facing the polygonal surface of the insert body facing the tool rotation direction rear side,
    In the milling insert, the corner portion protrudes toward the outer periphery of the tip of the tool body, the rake face of the cutting edge portion faces the direction of tool rotation, and the bank-like portion is attached to the bottom surface of the chip pocket and the attachment. A blade-exchangeable milling cutter, which is attached so as to extend along an intersecting ridge line portion with a seat wall surface.
  5. 　上記堤状部は、上記工具本体の後端側に向かうに従い外周側に向けて延びていることを特徴とする請求項４に記載の刃先交換式フライス。 The cutting edge-exchangeable milling machine according to claim 4, wherein the bank-shaped portion extends toward the outer peripheral side toward the rear end side of the tool body.
PCT/JP2014/069679 2013-07-30 2014-07-25 Milling cutter insert and exchangeable tool edge milling cutter WO2015016144A1 (en)

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JP2013157800A JP6264767B2 (en) 2013-07-30 2013-07-30 Cutting edge changeable milling cutter

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EP3593929A4 (en) * 2018-05-15 2020-03-04 Sumitomo Electric Hardmetal Corp. Cutting insert and milling tool
CN113631309A (en) * 2019-03-29 2021-11-09 三菱综合材料株式会社 Cutting insert and rotary cutting tool
CN114871482A (en) * 2022-04-22 2022-08-09 厦门金鹭特种合金有限公司 Combined type plane milling cutter
CN114871482B (en) * 2022-04-22 2024-04-26 厦门金鹭特种合金有限公司 Combined type plane milling cutter

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CN105764640B (en) * 2013-09-11 2017-09-15 三菱日立工具技术株式会社 Bit replacing formula rotary cutting tool
JP6817717B2 (en) 2016-04-07 2021-01-20 三菱マテリアル株式会社 Milling cutters, cutting inserts and milling methods
JP7043933B2 (en) * 2018-03-30 2022-03-30 三菱マテリアル株式会社 Cutting edge position adjustment mechanism and milling tool
JP7076013B2 (en) * 2018-12-26 2022-05-26 日東工器株式会社 Tip holders, chamfering machines, and cutting tips
DE102019112405A1 (en) * 2019-05-13 2020-11-19 Schaeffler Technologies AG & Co. KG Milling tool and method for manufacturing a rolling bearing cage
JP2021035711A (en) * 2019-08-30 2021-03-04 三菱マテリアル株式会社 Cutting insert and cutting edge exchange type cutter

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EP3593929A4 (en) * 2018-05-15 2020-03-04 Sumitomo Electric Hardmetal Corp. Cutting insert and milling tool
US10807173B2 (en) 2018-05-15 2020-10-20 Sumitomo Electric Hardmetal Corp. Cutting insert and milling tool
CN113631309A (en) * 2019-03-29 2021-11-09 三菱综合材料株式会社 Cutting insert and rotary cutting tool
CN114871482A (en) * 2022-04-22 2022-08-09 厦门金鹭特种合金有限公司 Combined type plane milling cutter
CN114871482B (en) * 2022-04-22 2024-04-26 厦门金鹭特种合金有限公司 Combined type plane milling cutter

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