JP2008100316A - Cutting tool, and finishing blade insert - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting tool which can suppress the occurrence of burrs by a finishing blade for cutting the machined surface cut by a cutting blade so as to sweep it, and also can prevent the chipping of the finishing blade, and further to provide a finishing blade insert thereof. <P>SOLUTION: In the cutting tool 10, inserts 30 are detachably attached on the attaching seats 14 provided on the outer periphery of the tip end side of a tool body 11 to be turned about an axis O. The finishing blade inserts 40 having finishing blades 44 located inside the outer peripheral blades of the inserts 30 on the radially inside of the tool body 11 and further located on the tip end side of the tool body 11 than facing blades are arranged in the tool body 11. The finishing blades 44 are set so as to have an axial rake angle α within 0° to 30°. The finishing blade inserts 40 have chamfered portions formed so as to cross the finishing blades 44 at an obtuse angle viewed from the front side of the turning direction T of the tool and also so as to cross the finishing blades 44 at an obtuse angle viewed from the tip end side of the tool body 11. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention provides a finishing blade insert having a tool body rotated about an axis, an insert having a front blade and an outer peripheral blade, and a finishing blade for cutting to finish a machining surface cut by the front blade and the outer peripheral blade. The present invention relates to a cutting tool to which is attached and a finishing blade insert to be attached to the cutting tool.

  Conventionally, a milling cutter in which a plurality of inserts are mounted on a disk-shaped tool body has been used as a cutting tool for performing planar processing on a workpiece. In this type of cutting tool, an insert made of a hard material such as cemented carbide is detachably attached to a plurality of recesses and mounting seats formed on the outer periphery on the front end side of a disk-shaped tool body, By rotating the main body at high speed around its axis and sending it in the direction intersecting the axis, the cutting body is cut by the cutting blade (outer peripheral blade) directed to the outside of the tool body in the radial direction of the insert, and the tool body The workpiece is flattened with a cutting blade (front blade) directed to the tip side.

It is known that, when such planar processing is performed, the sharpness deteriorates with wear of the cutting edge of the insert, and burrs are generated on the processed surface. As a milling cutter that suppresses the generation of burrs, for example, as disclosed in Patent Document 1, there is proposed a milling cutter provided with a finishing blade for removing burrs separately from a cutting blade that performs normal cutting. In this milling cutter, in order to suppress the occurrence of burrs in cutting by the finishing blade, a positive clearance angle is given to the finishing blade and sharpness is secured as a sharp edge without providing honing.
JP 02-116408 A

  By the way, in the milling cutter described in Patent Document 1, since the finishing blade has a sharp edge, there is a risk of chipping during cutting. When a honing treatment is provided on the cutting edge of the finishing blade to prevent chipping, cutting resistance increases and burrs are generated even when cutting with the finishing blade.

  The present invention has been made in view of such circumstances, and is capable of suppressing generation of burrs by a finishing blade that is cut so as to expose a processing surface cut by a cutting blade, and can prevent chipping of the finishing blade. An object is to provide a tool and a finishing blade insert.

  In order to solve this problem, in the cutting tool of the present invention, an insert provided with a front blade and an outer peripheral blade is detachably mounted on a mounting seat provided on the outer periphery on the distal end side of a tool body rotated about an axis. A cutting tool, wherein the tool body is positioned on the inner side in the radial direction with respect to the outer peripheral blade of the insert mounted on the mounting seat, and is located on the tip side of the tool body with respect to the front blade. A finishing blade insert with a blade is arranged, and the finishing blade is set so that an axial rake angle α is in a range of 0 ° ≦ α ≦ 30 °, and the finishing blade insert is viewed from the front side in the tool rotation direction. A chamfered portion that intersects with the finishing blade at an obtuse angle and intersects with the finishing blade at an obtuse angle when viewed from the front end side of the tool body is formed.

  Furthermore, the finishing blade insert of the present invention is a finishing blade insert used for the above-described cutting tool, and has an outer shape of a substantially rectangular flat plate shape, two rectangular surfaces and four side surfaces, and one rectangular shape. The surface is a front flank, one side is a rake face, the other side continuous to the one side is an outer flank face, and a finishing blade is provided at the ridge line portion between the rake face and the front flank face Provided at the corner where the rake face, the outer peripheral flank face and the front flank face intersect with the finish blade at an obtuse angle when viewed from the front side in the tool rotation direction, and also when viewed from the front end side of the tool body. A chamfered portion that intersects the finishing blade at an obtuse angle is formed.

In the cutting tool and the finishing blade insert of this configuration, a chamfered portion is formed that intersects with the finishing blade at an obtuse angle when viewed from the front side in the tool rotation direction and also intersects with the finishing blade at an obtuse angle when viewed from the tip side of the tool body. Therefore, the rigidity of the cutting edge portion of the finishing blade is ensured, and the chipping can be prevented.
Furthermore, since the axial rake angle α of this finishing blade is 0 ° or more, the sharpness of the finishing blade can be improved and the occurrence of burrs by the finishing blade can be suppressed. Further, since the axial rake angle α of the finishing blade is 30 ° or less, the finishing blade can be prevented from being damaged.

  Here, by forming a cutting blade portion made of a diamond sintered body on the rake face of the finishing blade insert and providing the finishing blade on the cutting blade portion, the sharpness of the finishing blade is improved and the cutting edge of the cutting edge is improved. Since wear is prevented, the generation of burrs by the finishing blade can be reliably prevented.

  The finishing blade may be a curved blade that is convex toward the tip of the tool body when viewed from the front side in the tool rotation direction, and the curvature radius R of the curved blade may be set within a range of 50 ≦ R ≦ 500. Good. Since the radius of curvature R of the finishing blade, which is a curved blade, is increased to R ≧ 50, the surface roughness of the machined surface is improved even if the feed amount when the tool body is fed in the direction intersecting the axis is increased. Can be finished. Furthermore, since the radius of curvature R is R ≦ 500, it is possible to suppress the cutting resistance at the time of cutting and suppress the generation of burrs.

  Further, at least two or more of the finishing blade inserts may be disposed on the tool body, and a position adjusting mechanism for adjusting the front runout of the finishing blade inserts may be provided. In this case, since burr removal is performed with two or more finishing blade inserts, the cutting amount of the finishing blade of one finishing blade insert can be suppressed, and wear of the cutting edge of the finishing blade can be further prevented. Moreover, since the position adjustment mechanism which adjusts the front runout of two or more finishing blade inserts is provided, a processed surface can be finished smoothly.

  According to the present invention, it is possible to provide a cutting tool and a finishing blade insert that can suppress generation of burrs by a finishing blade that is cut so as to expose a machining surface cut by a normal cutting blade, and can prevent chipping of the finishing blade. it can.

A milling cutter as a cutting tool according to an embodiment of the present invention will be described with reference to the accompanying drawings.
As shown in FIGS. 1 and 2, the milling cutter 10 has a tool body 11 having a substantially multi-stage columnar shape centered on an axis O, and a tool body 11 is provided at the center of the tool body 11. An attachment hole 12 for attachment to a spindle end or the like (not shown) of the machine tool is formed along the axis O.

  A plurality of first tip pockets 13 are formed on the outer periphery on the tip end side of the tool main body 11 in the circumferential direction. The first tip pockets 13 open to the outer side in the radial direction of the tool main body 11 and the tip end side of the tool main body 11. First mounting seats 14 are respectively provided on the rear side in the rotational direction T. In the present embodiment, as shown in FIG. 2, six first chip pockets 13 and first mounting seats 14 are formed.

  A wedge groove 15 is provided on the rear side of the first mounting seat 14 in the tool rotation direction T, and a wedge member 16 is disposed in the wedge groove 15 so as to protrude and retract in the radial direction of the tool body 11 by a clamp screw 17. ing. The wedge member 16 is arranged so that the width of the wedge member 16 decreases toward the inner side in the radial direction of the tool body 11 in the state where the wedge member 16 is mounted. 16A is in contact with the side wall 15A of the wedge groove 15 facing the front side in the tool rotation direction T.

  In addition, two second tip pockets 23 are formed on the outer periphery on the distal end side of the tool body 11 so as to open outward in the radial direction of the tool body 11 and greatly open toward the distal end side of the tool body 11. A second mounting seat 24 is provided on each of the two chip pockets 23 on the rear side in the tool rotation direction T. In the present embodiment, as shown in FIG. 2, the two second chip pockets 23 and the second mounting seat 24 are arranged 180 degrees rotationally symmetrical about the axis O.

  As shown in FIG. 3, the wall surface 24 </ b> A facing the front end side of the tool body 11 of the second mounting seat 24 gradually recedes toward the rear end side of the tool body 11 gradually toward the inner side in the radial direction of the tool body 11. It is inclined so as to intersect O at an angle θ. Further, as shown in FIG. 4, the wall surface 24 </ b> A is formed so as to gradually recede toward the rear end side of the tool body 11 as it goes toward the rear side in the tool rotation direction T. Further, a fixing screw hole 26 into which a fixing screw 25 for fixing a finishing blade insert 40 described later is screwed is formed in the wall surface 24A so as to be orthogonal to the wall surface 24A.

Further, the wall surface 24B of the second mounting seat 24 facing the front side in the tool rotation direction T is inclined so as to gradually recede toward the rear side in the tool rotation direction T as it goes radially inward.
Further, a pressing screw 27 is disposed on the wall surface 24 </ b> C of the second mounting seat 24 facing the outside in the radial direction of the tool body 11 as an adjusting means for adjusting the position of the finishing blade insert 40, which will be described later.

As shown in FIGS. 1 and 2, the cutting insert 30 mounted on the first mounting seat 14 has a substantially square flat plate shape, and one square surface 31 </ b> A is a rake surface, and the tool rotation direction T is forward. Is directed to the side. As shown in FIG. 5, a main cutting edge 32 and a sub-cutting edge 33 slightly inclined with respect to the main cutting edge 32 are formed on the side ridge portion of one square surface 31 </ b> A (rake face) of the cutting insert 30. The honing part 34 is formed in the corner | angular part of the cutting insert 30.
Further, as shown in FIG. 2, a positive clearance angle is given to a side surface continuous with one square surface 31 </ b> A (rake surface), and the cutting insert 30 is a so-called positive type insert.

  The cutting insert 30 has a part of one square surface 31A (rake face) in contact with the wall surface 14A facing the rear side in the tool rotation direction T of the first mounting seat 14 and one square face 31A (rake face). The wedge member 16 is placed in contact with the other square surface 31B facing the tool, and the wedge member 16 is inserted into the tool main body 11 in the radial direction by the clamp screw 17 so that the tool of the first mounting seat 14 is inserted. It is sandwiched between the wall surface 14 </ b> A facing the rear side in the rotation direction T and the surface 16 </ b> B facing the front side in the tool rotation direction T of the wedge member 16. The main cutting edge 32A directed outward in the radial direction of the tool body 11 is an outer peripheral blade, and the main cutting edge 32B directed toward the distal end side of the tool body 11 is a front blade. Further, the sub cutting edge 33 connected to the main cutting edge 32 </ b> B (front cutting edge) directed toward the distal end side of the tool body 11 is positioned on a virtual plane orthogonal to the axis O.

On the other hand, as shown in FIGS. 2 to 4, the finishing blade insert 40 mounted on the second mounting seat 24 has two rectangular surfaces and four side surfaces, the outer shape being a substantially rectangular flat plate shape. The rectangular surface 41A is a front flank, one side 42A is a rake face, and the other side 42B connected to the one side 42A is an outer peripheral flank.
A cutting edge portion 43 made of a diamond sintered body is provided at the intersection of one side surface 42A, which is a rake face, and one rectangular surface 41A, which is a front relief surface. A finishing blade 44 is provided at an intersecting ridge line portion between one side surface 42A (rake face) of the cutting blade portion 43 and one square surface 41A (front flank surface), and the finishing blade insert 40 is a so-called vertical blade type. It is an insert.

  As shown in FIG. 6, the finish blade insert 40 is attached to the second mounting seat 24 at the corners facing the distal end side of the tool body 11 and the outer side in the radial direction of the tool body 11 when viewed from the front side of the tool rotation direction T. In this way, a chamfer 45 is formed that intersects the finishing blade 44 at an obtuse angle and intersects the finishing blade 44 at an obtuse angle as shown in FIG.

Further, as shown in FIG. 4, one side 42A, which is a rake face, and one rectangular face 41A, which is a front flank face, are configured to intersect at an acute angle, and as shown in FIG. One side surface 42 </ b> A defined as the outer circumferential flank and the other side surface 42 </ b> B are configured to intersect at an acute angle.
Further, an insertion hole 46 penetrating in the thickness direction is opened on one rectangular surface 41A which is a front relief surface.

  The finish blade insert 40 has another rectangular surface 41B facing the one rectangular surface 41A, which is a front relief surface, abutting against a wall surface 24A facing the tip side of the tool body 11 of the second mounting seat 24, and scooping. A side surface 42 </ b> C facing the one side surface 42 </ b> A is abutted against a wall surface 24 </ b> B facing the front side in the tool rotation direction T of the second mounting seat 24. Here, the center of the fixing screw hole 26 formed in the wall surface 24 </ b> A facing the distal end side of the tool body 11 of the second mounting seat 24 is radially inward of the tool body 11 from the center of the insertion hole 46 of the finishing blade insert 40. It is slightly eccentric to the rear side in the tool rotation direction T. The fixing screw 25 inserted through the insertion hole 46 is screwed into the fixing screw hole 26, so that the finishing blade insert 40 is fixed so as to be drawn inwardly in the tool body 11 radial direction and in the tool rotation direction T rear side. Is done.

As shown in FIG. 4, the finishing blade insert 40 mounted on the second mounting seat 24 has an axial rake angle α set to 0 ° ≦ α ≦ 30 °, more specifically set to α = 20 °. . Further, as shown in FIG. 4, the front clearance angle γ is set to γ = 10 °. In the present embodiment, as shown in FIG. 2, the radial rake angle β of the finishing blade 44 is set to 0 ° ≦ β ≦ 45 °, and more specifically, β = 20 °.
Further, as shown in FIGS. 5 and 6, the finishing blade 44 has a curved shape that protrudes toward the tip end side of the tool body 11 when viewed from the front side of the tool rotation direction T, and the radius of curvature R is determined by the tool radius. When viewed from the front in the rotational direction T, it is set within a range of 50 ≦ R ≦ 500, and more specifically, R = 250 mm.

When the rotation trajectory around the axis O of the cutting insert 30 mounted on the first mounting seat 14 and the finishing blade insert 40 mounted on the second mounting seat 24 is viewed from the front side in the tool rotation direction T, as shown in FIG. The finishing blade insert 40 is located on the inner side in the radial direction of the tool body 11 larger than the outer peripheral blade (main cutting edge 32A) of the cutting insert 30, and the tool body 11 than the front blade (main cutting edge 32B) of the cutting insert 30. Located on the tip side.
More specifically, the finishing blade 44 protrudes from the auxiliary cutting edge 33 connected to the front cutting edge (main cutting edge 32B) by the protruding amount h toward the tip end side of the tool body 11. In the present embodiment, the protrusion amount h is set within a range of 0.01 ≦ h ≦ 0.03, and more specifically, h = 0.02 mm.

  In the present embodiment, the finishing blade inserts 40 are respectively attached to the two second mounting seats 24 that are arranged 180 degrees symmetrically about the axis O, and the finishing blades 44 of these finishing blade inserts 40 are arranged. It is necessary to adjust the front runout of the finishing blade 44 so that the positions in the axis O direction coincide. Here, the finishing blade insert 40 is pressed toward the outer side in the radial direction of the tool body 11 by screwing the pressing screw 27 provided on the second mounting seat 24, and moves along the wall surface 24A facing the tip side of the tool body 11. . The wall surface 24A facing the front end side of the tool body 11 gradually recedes toward the rear end side of the tool body 11 gradually inward in the radial direction of the tool body 11, and is inclined so as to intersect the axis O at an angle θ. Therefore, the finishing blade 44 protrudes toward the tip end side of the tool body 11. Therefore, it is possible to adjust the front runout of the finishing blade 44 by the pressing screw 27.

  The milling cutter 10 in which the front runout of the two finishing blade inserts 40 is adjusted in this way is attached to the spindle end (not shown) of the machine tool using the mounting hole 12 formed in the tool body 11, and rotates around the axis O. And is fed in a direction crossing the axis O, and the surface of the material to be cut is cut by the outer peripheral edge (main cutting edge 32A) and the front cutting edge (main cutting edge 32B) of the cutting insert 30. In addition to processing, the finishing blade 44 of the finishing blade insert 40 is cut so as to finish the processing surface.

  According to the milling cutter 10 of the present embodiment, the finishing blade insert 40 intersects with the finishing blade 44 at an obtuse angle when viewed from the front side of the tool rotation direction T, and at the same time with the finishing blade 44 and the obtuse angle when viewed from the tip side of the tool body 11. Therefore, the rigidity of the cutting edge portion of the finishing blade 44 is ensured, and the finishing blade insert 40 can be prevented from being lost.

Further, since the axial rake angle α of the finishing blade 44 is set within the range of 0 ° ≦ α ≦ 30 °, more specifically, α = 20 °, the sharpness of the finishing blade 44 can be improved. The occurrence of burrs by the finishing blade 44 can be suppressed.
Furthermore, in this embodiment, since the radial rake angle β is set in the range of 0 ° ≦ β ≦ 45 °, more specifically β = 20 °, the sharpness of the finishing blade 44 is further improved. be able to.

  Further, a cutting edge portion 43 made of a diamond sintered body is formed on one side face 42A which is the rake face of the finishing blade insert 40, and the one side face 42A and the front face which are the rake face of the cutting edge portion 43 are formed. Since the finishing blade 44 is provided at the intersecting ridge line portion with the one quadrangular surface 41A as the flank, the sharpness of the finishing blade 44 is further improved and the wear of the finishing blade 44 is prevented. Therefore, generation of burrs by the finishing blade 44 can be reliably prevented.

  Further, the finishing blade 44 is formed in a curved shape that is convex toward the tip end side of the tool body 11 when viewed from the front side in the tool rotation direction, and the curvature radius R is more specifically within a range of 50 ≦ R ≦ 500. Since R = 250 mm, the surface roughness of the machined surface can be satisfactorily finished even if the feed amount when the tool body 11 is fed in the direction intersecting the axis O is increased. Furthermore, since the part which contacts a process surface does not become large too much, cutting resistance can be suppressed and generation | occurrence | production of the burr | flash by the finishing blade 44 can be suppressed.

  Further, the finishing blade insert 40 is mounted on each of the two second mounting seats 24 that are arranged 180 degrees symmetrically about the axis O, and the front deflection of the finishing blade 44 is adjusted on the second mounting seat 24. Since the pressing screw 27 is provided, the machining surface can be finished smoothly by matching the position of the finishing blade 44 in the axis O direction. Furthermore, since the amount of cutting by the finishing blade 44 of one finishing blade insert 40 is reduced, wear of the finishing blade 44 can be reliably prevented.

  Further, the finishing blade 44 of the finishing blade insert 40 protrudes from the auxiliary cutting edge 33 of the cutting insert 30 toward the tip end side of the tool body 11 by a protrusion amount h. In this embodiment, 0.01 ≦ h ≦ 0.03. Since it is set within the range, more specifically, h = 0.02 mm, the burr can be surely removed by the finishing blade 44, and the cutting amount of the finishing blade 44 is reduced to reduce the wear of the finishing blade 44. Can be prevented.

As mentioned above, although the milling cutter which is embodiment of this invention was demonstrated, this invention is not limited to this, It can change suitably in the range which does not deviate from the technical idea of the invention.
For example, although it demonstrated as what provided the 2nd mounting seat which mounts a finishing blade insert, it is not limited to this, One or three or more finishing blade inserts may be sufficient. It is preferable to set appropriately considering the material of the workpiece, cutting conditions, and the like.

  Further, the finishing blade insert has been described as a so-called vertical blade type, but is not limited thereto, and the shape of the finishing blade insert can be arbitrary. However, the finishing blade insert needs to have a chamfered portion that intersects the finishing blade at an obtuse angle when viewed from the front side of the tool rotation direction T and intersects the finishing blade at an obtuse angle when viewed from the tip side of the tool body. is there.

  Moreover, although the cutting insert was demonstrated as a square flat plate-shaped thing, it is not limited to this, For example, a parallelogram and a triangular flat plate shape may be made.

It is explanatory drawing of the milling cutter which is embodiment of this invention. It is a bottom view of the milling cutter shown in FIG. It is detail drawing of the 2nd attachment seat provided in the milling cutter shown in FIG. FIG. 4 is a view in the direction of the arrow X in FIG. 3. FIG. 2 is a layout view of the milling cutter insert and the finishing blade insert shown in FIG. 1. It is the figure which looked at the blade edge | tip part of the finishing blade cutting insert from the tool rotation direction front. It is a Y direction arrow directional view in FIG. It is a Z direction arrow directional view in FIG.

Explanation of symbols

10 Milling cutter (cutting tool)
11 Tool body 14 First mounting seat (mounting seat)
27 Press screw (position adjustment mechanism)
30 Cutting insert (insert)
32 Main cutting edge (front edge)
40 Finishing blade insert 41A One square surface (front flank)
41B Other square surface 42A One side surface (rake surface)
42B Other side (outer flank)
43 Cutting blade 44 Finishing blade 45 Chamfer

Claims (5)

A cutting tool in which an insert provided with a front blade and an outer peripheral blade is detachably mounted on a mounting seat provided on the outer periphery on the tip side of a tool body rotated around an axis,
The tool body includes a finishing blade insert that is positioned radially inward of the outer peripheral blade of the insert mounted on the mounting seat and is positioned closer to the tip of the tool body than the front blade. Is placed,
In the finishing blade, the axial rake angle α is set within a range of 0 ° ≦ α ≦ 30 °,
The finishing blade insert has a chamfered portion that intersects with the finishing blade at an obtuse angle when viewed from the front side in the tool rotation direction, and also intersects with the finishing blade at an obtuse angle when viewed from the tip side of the tool body. Cutting tool characterized by   The cutting edge according to claim 1, wherein a cutting edge portion made of a diamond sintered body is formed on the rake face of the finishing blade insert, and the finishing blade is provided on the cutting edge portion. tool.   The finishing blade is a curved blade that is convex toward the tip of the tool body when viewed from the front side in the tool rotation direction, and the radius of curvature R of the curved blade is set within a range of 50 ≦ R ≦ 500. The cutting tool according to claim 1, wherein the cutting tool is provided.   The said tool main body is provided with the position adjustment mechanism which adjusts the front runout of these said finishing blade inserts while at least 2 or more of the said finishing blade inserts are arrange | positioned. The cutting tool in any one of. A finishing blade insert used in the cutting tool according to any one of claims 1 to 4,
The outer shape is a substantially rectangular flat plate, has two rectangular surfaces and four side surfaces, one rectangular surface is a front relief surface, one side is a rake surface, and the other side connected to the one side surface A side surface is an outer peripheral flank, and a finishing blade is provided at a cross ridge line portion between the rake face and the front flank,
The finishing blade intersects the finishing blade at an obtuse angle when viewed from the front side in the tool rotation direction at the corner where the rake surface, the outer peripheral flank and the front flank intersect, and also when viewed from the front end side of the tool body. A finishing blade insert characterized in that a chamfered portion intersecting at an obtuse angle is formed.

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