JP6260330B2 - Wiper insert and blade face changeable face mill - Google Patents

Description

  The present invention relates to a wiper insert and a blade-tip replaceable face mill using the wiper insert.

  Conventionally, for example, as shown in Patent Document 1 below, cutting inserts are respectively provided on a plurality of insert mounting seats provided at circumferential intervals in the outer periphery of a tip of a tool body rotated around a tool axis. 2. Description of the Related Art Blade-replaceable face mills that are detachably mounted are known. In this cutting edge replaceable face mill, at least one of the plurality of cutting inserts mounted on the tool body is a wiper insert (finishing insert) used for finishing the cutting surface of the work material. The cutting insert other than the wiper insert is a standard machining insert (rough machining tip).

  The wiper insert is arranged so as to protrude slightly toward the tip of the tool from the standard machining insert, and has a wiping blade that can be placed in a virtual plane perpendicular to the tool axis. The feed mark on the cut surface of the work material cut by the insert is removed to finish the surface to a smooth finish.

For example, when only one wiper insert is provided in the tool body, the wiper insert has a blade length that is set to be longer than the feed amount per rotation around the tool axis of the tool body. The wiper insert having such a long blade length and the standard machining insert have different shapes.
Therefore, in Patent Document 1, cartridge members (rough machining chip mounting members and finishing chip mounting members) corresponding to the inserts can be mounted on the tool body so that these standard processing inserts and wiper inserts having different shapes can be mounted on the tool body. ).

JP 2007-237356 A

  By the way, in this kind of cutting edge exchange type front milling machine, in order to reduce the number of parts of the tool and improve the ease of mounting of the cutting insert, a plurality of insert mounting seats are formed in the same shape as each other and used for standard machining. It is preferable that the insert and the wiper insert can be directly attached to the tool main body (the insert mounting seat) without distinguishing between the insert and the wiper insert. That is, it is desirable that the cutting insert can be directly attached to the tool body without using the cartridge member as described above.

  Here, the blade-tip-exchangeable face mill shown in FIG. 12 and FIG. 13 is formed by forming a plurality of insert mounting seats 102 of the tool body 101 in the same shape. A standard processing insert 103 used for standard processing of a cutting surface of a material and a wiper provided with a wiping blade 104a and having a shape different from that of the standard processing insert 103 and used for finishing processing of a cutting surface of a work material This is an example in which the insert 104 is directly attached without being distinguished. In this example, the wiper insert 104 is attached to one of the seven insert mounting seats 102, and the standard processing insert 103 is attached to the other six.

  In the cutting edge replaceable face mill having the above-described configuration, the ease of manufacturing of the tool body 101, the ease of mounting of the cutting inserts 103 and 104 on the tool body 101, and various cutting conditions (for example, only when one wiper insert 104 is provided) In addition, it is possible to improve the ease of handling a case where two to three wiper inserts 104 are used according to high feed.

However, the following problems occur in the above-described blade-tip-replaceable face mill.
That is, when the standard processing insert 103 and the wiper insert 104 are respectively attached to the plurality of insert mounting seats 102 having the same shape, as shown in FIGS. A part of the wall 102a (triangular hatching portion shown in FIG. 15) facing the tool tip side is exposed in the insert mounting seat 102 to which is attached, and there is a risk that the chip will be abraded and worn.

  12 and 13, the standard processing insert 103 has a 90 ° rotationally symmetric shape around the insert axis (the center axis of the cutting insert) and a reverse-inverted symmetric shape. While the width (the length in the direction connecting the front and back surfaces) is substantially constant over the entire outer peripheral surface, the wiper insert 104 shown in FIGS. 14 and 15 has, for example, the length of the wiper blade 104a. Corresponding to the wiper blade 104a on the outer peripheral surface of the insert body in view of the fact that it cannot be formed into a 90 ° rotationally symmetric shape due to the necessity of making it longer than the feed amount per tool rotation, and manufacturing material costs, etc. Of the portion that does not correspond to the wiping blade 104a (specifically, the portion that abuts against the wall portion 102a of the insert mounting seat 102) with respect to the width of the portion to be adjacent (adjacent portion) This is due to the reason for reducing the width.

  The present invention was made in view of such circumstances, and the shape of a plurality of insert mounting seats is made common without distinguishing between the standard processing insert and the wiper insert, and the ease of manufacture of the tool main body, While improving the ease of mounting of the cutting insert to the tool body and the ease of handling various cutting conditions, it is possible to prevent wear of the wall portion facing the tool tip side of the insert mounting seat to which the wiper insert is attached. And providing a wiper insert capable of stably maintaining a high quality of the cutting work performed by the cutting insert mounted on the insert mounting seat, and a blade-tip-replaceable face mill using the wiper insert. It is aimed.

In order to solve such problems and achieve the above object, the present invention proposes the following means.
That is, according to the present invention, a plurality of insert mounting seats that are provided in the tool peripheral direction and spaced apart in the tool circumferential direction at the tip outer periphery of the tool body that is rotated around the tool axis are detachably mounted. A wiper insert used for finishing a cutting surface of a work material among a plurality of cutting inserts, an insert body having a pentagonal plate shape, front and back surfaces of the insert body, and peripheral edges of the front and back surfaces An outer peripheral surface that connects the outer surfaces, and at least a surface of the front and back surfaces, and a cutting edge that is formed at an intersecting ridge line portion between the outer peripheral surface, and the surface has five sides and five corners And the cutting edge is formed in a region corresponding to the four side portions and the three corner portions, and the cutting edge is a wiping blade that can be arranged in a virtual plane perpendicular to the tool axis. Have Of the peripheral edge of the surface, the protrusion is located at a portion adjacent to the outer peripheral surface portion of the insert body that is positioned away from the wiping blade and contacts the wall portion facing the tool tip side of the insert mounting seat. The protruding portion is formed on one of the side portions where the cutting edge is not formed .
Further, the cutting edge replaceable face mill according to the present invention includes a tool body rotated around a tool axis, and a plurality of pieces formed in the tool circumferential direction at intervals in the tool circumferential direction at the tip outer periphery of the tool body and having the same shape. An insert mounting seat and a plurality of cutting inserts that are detachably mounted on the insert mounting seat, and the plurality of cutting inserts include standard processing inserts used for standard processing of a cutting surface of a work material. And a wiper insert having a shape different from that of the standard machining insert and used for finishing a cutting surface of a work material, and the plurality of wiper inserts described above as the wiper insert. At least one of the insert mounting seats is mounted.

According to the wiper insert of the present invention and the cutting edge replaceable face mill using the same, the shape of the insert mounting seat is made common without depending on the type of cutting insert (standard processing insert and wiper insert (finishing The insert mounting seats are the same shape without having separate shapes), the ease of manufacturing of the tool body, the ease of mounting of the cutting insert on the tool body, and various cutting conditions (for example, the tool body) In the insert mounting seat to which the wiper insert is attached while improving the ease of handling not only when providing one wiper insert in the case, but also when using two to three wiper inserts according to high feed, etc., It is possible to remarkably suppress the progress of wear of the wall portion facing the tool tip side of the insert mounting seat.
The “standard machining” in the present specification is a general (standard) cutting process (face milling) using the main cutting edge and the wiping edge of the standard machining insert, and is performed by using the wiping blade of the wiper insert. Compared with finishing, it refers to machining that makes the cut surface of the work material rough.

Specifically, conventionally, when a standard machining insert and a wiper insert are respectively mounted on a plurality of insert mounting seats having the same shape, the tool tip side is placed on the insert mounting seat on which the wiper insert is mounted. A part of the facing wall portion was exposed and could be abraded by chips and worn.
This is because the insert for standard processing has, for example, a 90 ° rotationally symmetric shape around the insert axis and a reverse symmetric shape, and the width of the outer peripheral surface of the insert body (the length in the direction connecting the front and back surfaces) is Whereas the wiper insert is generally constant over the entire surface, the wiper insert has a rotationally symmetrical shape around the insert axis, for example, due to the need to make the length of the wiper blade longer than the feed per tool rotation. In view of the difficulty of forming and the material cost of manufacturing, etc., the portion of the outer peripheral surface of the insert body that does not correspond to the wiping blade relative to the width of the portion corresponding to the wiping blade (adjacent portion) (specifically This is because, for example, the width of the portion of the insert mounting seat that is in contact with the wall portion facing the tool tip side is reduced.

  In particular, in the case of a configuration in which the main cutting edge of the standard processing insert is set to a positive angle (a configuration in which the main cutting edge extends so as to have a positive angle with respect to a plane perpendicular to the insert axis). Since the outer peripheral surface portion of the insert main body corresponding to the main cutting edge is also inclined, the wall portion of the insert mounting seat abutted on the outer peripheral surface portion is also inclined. When the wiper insert is attached to the insert mounting seat having the inclined wall portion as described above, the above-described exposure is likely to occur, and the problem of wear tends to be remarkable. Then, if the wall portion of the insert mounting seat is abraded and worn by chips, the seating stability cannot be secured when the insert for standard processing is next mounted on the insert mounting seat, which may affect the processing accuracy. .

  Therefore, in the present invention, a protrusion is provided at a portion adjacent to the outer peripheral surface portion of the insert body that is brought into contact with the wall portion facing the tool tip side of the insert mounting seat, of the peripheral edge of the surface of the insert body of the wiper insert. The projection portion covers the wall portion of the insert mounting seat to prevent exposure, and scrapes are prevented from rubbing against the wall portion. Moreover, since the flow direction of the chip can be changed by the protrusion, it is possible to more reliably prevent the chip from rubbing against the wall. In other words, it is more prominent that the chips generated by cutting the work material with the wiping blade flow on the surface of the insert body, change the direction by being applied to the protrusion, and hit the wall of the insert mounting seat. This prevents the progress of wear.

  As described above, according to the present invention, the shape of the plurality of insert mounting seats is made common without distinguishing between the standard processing insert and the wiper insert, so that the manufacture of the tool body and the ease of mounting the cutting insert on the tool body are facilitated. In addition, it is possible to prevent wear of the wall portion facing the tool tip side of the insert mounting seat to which the wiper insert is mounted while improving the ease of handling various cutting processing conditions, and the cutting mounted on the insert mounting seat. The accuracy of the cutting process by the insert can be stably maintained at a high quality.

  In the wiper insert of the present invention, a surface of the protrusion that faces the wall portion of the insert mounting seat is formed so as to be flush with an outer peripheral surface portion of the insert body that contacts the wall portion. It is good also as being done.

  In this case, since the protrusion is formed so as to be flush with the outer peripheral surface portion of the insert main body, the protrusion along with the outer peripheral surface portion of the insert main body with respect to the wall portion facing the tool tip side of the insert mounting seat. The parts can be brought into contact with each other. That is, it is possible to bring the insert body into contact with the wall portion in a wide range while exhibiting the effect of suppressing the above-described wall wear by the protruding portion, and the seating stability of the wiper insert is improved.

  Further, in the wiper insert of the present invention, the cutting blade includes a pair of wiping blades extending adjacent to each other in different directions, and when the surface of the insert body is viewed from the front, the surface is a pair of It is good also as being line-symmetrical shape which makes the virtual bisector of the angle between the said scalpel blades a symmetry axis.

  In this case, the same wiper insert can be used regardless of whether the tool rotation direction of the tool body is one or the other around the tool axis (that is, whether the tool is right-handed or left-handed). it can.

  Further, in the wiper insert of the present invention, the cutting edge includes a main cutting edge extending so as to form an obtuse angle with the wiping edge when the surface is viewed in front, and the main cutting edge includes the wiping edge. It is good also as extending toward the insert inner side along the insert axial direction of the said insert main body as it leaves | separates from a blade.

  In this case, even if the wiper insert is mounted to the insert mounting seat in a posture in which the axial rake angle is negative (negative) (that is, the insert axis extends toward the tool tip side toward the front in the tool rotation direction). Even if it is), the main cutting edge of the wiper insert can be set to a positive angle. Therefore, among the cutting edges of the wiper insert, it is possible to increase the sharpness of the main cutting edge while ensuring a large blade angle of the wiping edge and ensuring the strength of the cutting edge.

  In addition, in the case of the said structure, the part (outer peripheral surface part of the said insert main body) which contact | abuts the wall part which faces the tool front end side of an insert mounting seat among the outer peripheral surfaces of an insert main body because the main cutting edge inclines. Although it is conceivable that the width (the length in the direction connecting the front and back surfaces) becomes smaller, since the wiper insert of the present invention has the protrusion as described above, the insert mounting seat on which the wiper insert is mounted is provided. The exposure of the wall portion can be reliably prevented.

  Moreover, the wiper insert of this invention WHEREIN: The said insert main body is good also as being made into the front-and-back inversion symmetrical shape.

  In this case, since the insert main body has a front and back inversion symmetrical shape, the cutting edge is formed not only on the cross ridge line portion between the surface of the insert main body and the outer peripheral surface but also on the cross ridge line portion between the back surface and the outer peripheral surface. As a result, the number of usable cutting edges is doubled, and the tool life can be significantly extended.

  Further, in the wiper insert of the present invention, on the front and back surfaces, a seating portion that contacts a bottom portion facing the tool rotation direction of the insert mounting seat is formed, and the seating portion formed on the same surface of the front and back surfaces The relative position between the cutting edge and the cutting edge may be such that the seating portion is disposed on the inner side of the insert along the insert axial direction of the insert body with respect to the cutting edge.

In this case, the front and back surfaces of the insert main body extend toward the outside of the insert along the insert axial direction from the seating portion formed on the same surface toward the cutting edge, thereby positively setting the rake angle of the cutting edge. (Correct) It becomes easy to ensure large and can improve sharpness. In addition, since the distance along the insert axis direction between the cutting edge on the front surface (or the back surface) and the seating portion on the back surface (or the front surface) can be reduced, the moment generated by the cutting blade receiving cutting resistance during cutting can be reduced. This makes it possible to improve seating stability.
In the wiper insert of the present invention, the protrusion is a rib extending in the insert circumferential direction around the insert axis, and the surface of the protrusion facing inward in the insert radial direction perpendicular to the insert axis is the insert. A concave curved surface that is recessed toward the outside in the radial direction may be formed, and the height of the protrusion gradually increases along the insert axial direction toward the outside in the insert radial direction.

  According to the wiper insert of the present invention and the cutting edge replaceable face mill using the same, the shape of a plurality of insert mounting seats is made common without distinguishing between the standard processing insert and the wiper insert, and the tool body can be manufactured easily. In addition to improving the ease of mounting the cutting insert on the tool body and the ease of handling various cutting conditions, it prevents wear of the wall facing the tool tip side of the insert mounting seat on which the wiper insert is mounted. In addition, the accuracy of cutting by the cutting insert attached to the insert mounting seat can be stably maintained at high quality.

It is a perspective view which shows the blade-tip-exchange-type front milling machine which concerns on one Embodiment of this invention. It is a perspective view which shows the blade-tip-exchange-type front milling machine which concerns on one Embodiment of this invention. It is the front view which looked at the tool main body of the blade-tip-exchange-type front milling machine from the tool front end toward the tool base end side. It is a perspective view which shows the blade-tip-exchange-type front milling machine which concerns on the reference example of this invention. It is a perspective view which expands and shows the standard processing insert vicinity attached to the insert mounting seat of a tool main body. It is a perspective view which expands and shows the wiper insert vicinity attached to the insert mounting seat of a tool main body. It is a perspective view which expands and shows the wiper insert vicinity attached to the insert mounting seat of a tool main body. It is a figure which expands and shows the insert mounting seat vicinity of a tool main body. It is a perspective view which shows the wiper insert which concerns on one Embodiment of this invention. (A) Insert plan view of the front or back surface of the wiper insert as viewed from the front, (b) Out of the outer peripheral surface of the wiper insert, the front surface of the outer peripheral surface abutted against the wall portion facing the tool tip side of the insert mounting seat It is the insert side view seen in. (A) The side view which looked at the part (adjacent part) corresponding to the main cutting edge among the outer peripheral surfaces of a wiper insert on the front, (b) The longitudinal cross-sectional view (side sectional view) of a wiper insert. It is a perspective view which shows the reference example of a blade-tip-exchange-type front milling machine. It is a perspective view which shows the reference example of a blade-tip-exchange-type front milling machine. It is a perspective view which expands and shows the wiper insert vicinity of the reference example attached to the insert mounting seat of a tool main body. It is a perspective view which expands and shows the wiper insert vicinity of the reference example attached to the insert mounting seat of a tool main body.

Hereinafter, a wiper insert 40 according to an embodiment of the present invention, and a blade-tip replaceable face mill 1 using the same will be described with reference to the drawings.
The blade-tip-exchangeable face mill 1 to which the wiper insert 40 of this embodiment is attached is a face mill cutter that performs face milling on a work material made of a metal material or the like.

  As shown in FIGS. 1 to 3, the blade-exchangeable face mill 1 has a disk shape made of steel or the like and is rotated in the tool rotation direction T around the tool axis O, and an insert mounting seat is provided at the outer periphery of the tip. A plurality of cutting bodies 30 and 40, which are made of a hard material such as cemented carbide and are detachably attached to the insert mounting seat 3, steel materials, etc. A clamp screw 20 for fixing the cutting inserts 30 and 40 to the tool body 2 by being inserted into mounting holes 35 and 45 to be described later of the cutting inserts 30 and 40 and screwed into the insert mounting seat 3; It has.

Each cutting insert 30, 40 can be removed from the tool body 2 by loosening the screw of the clamp screw 20 screwed to the insert mounting seat 3 and removing the clamp screw 20 from the insert mounting seat 3. That is, the cutting inserts 30 and 40 can be attached to and detached from the insert mounting seat 3 of the tool body 2. Further, in a state in which the cutting inserts 30 and 40 are mounted on the insert mounting seat 3, the cutting edges 34 and 44 of the cutting inserts 30 and 40 are in front of the tool body 2 in the direction of the tool axis O, and It protrudes toward the outer side in the tool radial direction. In addition, the plurality of cutting inserts 30 and 40 have different shapes from the standard processing insert 30 used for standard processing of the cutting surface of the work material and the standard processing insert 30, and cut the work material. And a wiper insert 40 used for surface finishing. The wiper insert 40 is attached to at least one of the plurality of insert mounting seats 3 formed in the tool body 2.
The “standard machining” as used in this specification is a general (standard) cutting process (face milling process) by the main cutting edge 34a and the wiping edge 34b of the standard machining insert 30. The wiper insert 40 Compared with the finishing process with the scouring blade 44b, the process is a process in which the cut surface of the work material becomes rough.

The cutting edge-exchangeable face mill 1 has a base end portion of a tool body 2 attached to a main shaft of a machine tool (not shown) and rotated in a tool rotation direction T around a tool axis O to cut a work material. Provided for processing.
Here, in this specification, the insert mounting seat 3 side along the tool axis O direction of the tool body 2 is referred to as a tool tip side or simply the tip side, and is opposite to the insert mounting seat 3 along the tool axis O direction ( The main spindle side of the machine tool) is referred to as the tool base end side or simply the base end side. A direction perpendicular to the tool axis O is referred to as a tool radial direction, and a direction around the tool axis O is referred to as a tool circumferential direction. Of the tool circumferential directions, the direction in which the tool body 2 is rotated at the time of cutting is referred to as the front of the tool rotation direction T (or simply the tool rotation direction T), and the direction toward the opposite side from the front of the tool rotation direction T. It is called the rear of the tool rotation direction T.
In addition, a direction orthogonal to the insert axis C of the cutting inserts 30 and 40 is referred to as an insert radial direction, and a direction around the insert axis C is referred to as an insert circumferential direction.

  1 to 3, the tool body 2 has a disk shape centered on the tool axis O. In addition, the disk shape said by this specification is a concept including a disk shape, a column shape, and a cylindrical shape. A tool mounting hole 4 extending along the tool axis O is formed in the tool body 2 so as to penetrate the tool body 2. Further, a key groove 5 extending from the opening edge of the tool mounting hole 4 toward the outer side in the tool radial direction is formed on the end surface facing the base end side (upper side in FIG. 1) along the tool axis O direction in the tool body 2. Has been. The tool body 2 is attached to the spindle tip by a bolt member inserted into the tool mounting hole 4 with the keyway 5 fitted to a key provided at the spindle tip of a machine tool (not shown). The tool is rotated in the tool rotation direction T around the tool axis O, and is used for cutting the work material.

  At the end of the tool body 2 on the tip side (lower side in FIG. 1) along the tool axis O direction, a tip opened toward the tip side and radially outward so that the outer surface of the tool body 2 is notched. A pocket 6 is formed. A plurality of tip pockets 6 are formed on the outer peripheral portion of the tip of the tool body 2 at intervals in the circumferential direction.

  The insert pocket 6 is formed with an insert mounting seat 3 that is positioned at the end of the insert pocket 6 at the rear of the tool rotation direction T and faces the front of the tool rotation direction T. A coolant supply hole 7 is formed in the chip pocket 6 so as to open toward the cutting edges 34 and 44 of the cutting inserts 30 and 40 attached to the insert mounting seat 3. The insert mounting seat 3 is formed in a concave shape on the wall surface facing the front in the tool rotation direction T in the chip pocket 6 so as to correspond to the shape of the cutting inserts 30 and 40.

As shown in FIGS. 3 and 5 to 8, the insert mounting seat 3 is formed in a polygonal hole shape corresponding to the shape of the cutting inserts 30, 40 having a polygonal plate shape. The plurality of insert mounting seats 3 have the same shape.
In FIG. 8, the insert mounting seat 3 includes a bottom portion 8 that comes into contact with seating portions 37 and 47 described later of the cutting inserts 30 and 40, and a pair of walls that come into contact with outer peripheral surfaces 33 and 43 of the cutting inserts 30 and 40. Parts 9 and 10.

  The bottom portion 8 has a circular planar shape facing the front in the tool rotation direction T. A female screw hole 11 into which a clamp screw 20 can be screwed is formed in the center of the bottom portion 8. Of the surface facing the front in the tool rotation direction T of the insert mounting seat 3, the part other than the bottom part 8 (part around the bottom part 8) is moved backward from the bottom part 8 in the tool rotation direction T. Thus, the bottom 8 is formed so as to protrude most in the tool rotation direction T.

The pair of wall portions 9, 10 both face the tool tip side and have a belt-like planar shape.
Among these wall portions 9 and 10, the wall portion 9 located on the inner side in the tool radial direction is an inclined surface that gradually extends toward the tool proximal end side toward the outer side in the tool radial direction. Furthermore, the wall part 9 is extended toward the front of the tool rotation direction T gradually as it goes to the outer side of a tool radial direction.
Moreover, the wall part 10 located in the outer side of a tool radial direction among the wall parts 9 and 10 becomes the inclined surface extended toward a tool front end side gradually as it goes to the outer side of a tool radial direction. Furthermore, the wall part 10 is extended also toward the front of the tool rotation direction T gradually as it goes to the outer side of a tool radial direction.

As shown in FIG. 5, among the plural types of cutting inserts 30 and 40 attached to the blade-tip-exchangeable face mill 1 of this embodiment, the standard processing insert used for standard processing of the cutting surface of the work material. Reference numeral 30 denotes a polygonal plate-shaped insert body 31 that is reversely symmetric with respect to the front and back surfaces, front and back surfaces 32 of the insert body 31, and outer peripheral surfaces that connect the peripheral edges of these front and back surfaces 32 along the insert axial direction. 33 and a cutting edge 34 formed at a crossing ridge line portion between the front and back surfaces 32 and the outer peripheral surface 33.
That is, the standard machining insert (cutting insert) 30 is a double-sided type face milling cutting insert.

  The insert body 31 of the present embodiment has a square plate shape as its basic shape, and the front and back surfaces 32 are each formed in a square surface shape. Specifically, in FIG. 5, the front and back surfaces 32 have a regular polygonal basic shape that is rotationally symmetric with respect to an insert axis (not shown) that extends in the thickness direction of the insert body 31 through the center of the front and back surfaces 32. In the present embodiment, the front and back surfaces 32 have a square basic shape, and the front and back surfaces 32 have a 90 ° rotationally symmetric shape with respect to the insert axis.

In addition, the insert body 31 is provided with a mounting hole 35 that penetrates the insert body 31 in the insert axial direction and is opened at the center portion (on the insert axis) of the front and back surfaces 32.
The insert body 31 passes through the centers of four planar portions (main cutting edge relief surfaces 33a described later) corresponding to the four sides of the front and back surfaces 32 having a square basic shape on the outer peripheral surface 33 and is orthogonal to the insert axis. With respect to the symmetry axis, the insert body 31 and the standard processing insert 30 are symmetrically reversed.

  In the present embodiment, the front and back surfaces 32 are formed in a substantially square surface shape having four sides and four corners, and more specifically, the front and back surfaces 32 are four long sides constituting the side. And four short sides and eight corners constituting the corner, strictly speaking, it is formed in an octagonal surface, and one long side (main cutting edge 34a described later) Four sets (four sets) of one set of cutting blade assemblies each including one short side (a cleaning blade 34 b and a connecting blade 34 c described later) are arranged along the insert circumferential direction of the front and back surfaces 32.

A cutting edge 34 is formed over the entire circumference along the insert circumferential direction at the peripheral edge portion of the front and back surfaces 32 (specifically, the outer peripheral edge portion and the intersecting ridge line portion between the front and back surfaces 32 and the outer peripheral surface 33).
The cutting edge 34 is formed in a region (side portion) corresponding to the long side in the peripheral portion of the front and back surfaces 32, and a main cutting edge 34a used for main cutting and a region corresponding to the short side ( Finishing process provided to improve the finished surface of the work material by extending to form an obtuse angle with respect to the main cutting edge 34a when the front and back surfaces 32 are viewed in front. And a connecting blade 34c which is formed in a region (corner) corresponding to the short side and is located on the side opposite to the main cutting edge 34a of the cleaning blade 34b, the long side and the short side It has a curved corner blade 34d that is formed in a region (corner portion) corresponding to a corner portion intersecting with the side and smoothly connects the main cutting edge 34a and the wiping edge 34b.
In addition, the main cutting edge 34a and the wiping edge 34b may be directly connected without providing the corner edge 34d. Further, the connecting blade 34c may not be provided.

The set of cutting blade assemblies includes a main cutting edge 34a, a wiping blade 34b, a corner blade 34d positioned between and connecting the main cutting edge 34a and the wiping blade 34b, and the corner cutting edge 34d of the main cutting edge 34a. It is comprised by the connection blade 34c connected to the edge part on the opposite side.
The main cutting edge 34a of one set of cutting edge assemblies is a wiping edge 34b adjacent to the main cutting edge 34a (in this embodiment, the wiping edge 34b adjacent to the main cutting edge 34a with a corner edge 34d interposed therebetween. ) And gradually inclines toward the inner side of the insert along the insert axial direction toward the connecting blade 34c located on the opposite side of the wiper blade 34b. Regardless of the mounting orientation of the processing insert 30, it is easy to give a positive (positive) angle to the main cutting edge 34a.

Of the pair of cutting blade assemblies, the wiping blade 34b is a main cutting blade 34a adjacent to the wiping blade 34b (in this embodiment, the main cutting blade adjacent to the wiping blade 34b with the corner blade 34d interposed therebetween. 34a) and gradually extends toward the inner side of the insert along the insert axial direction as it goes toward the connecting blade 34c located on the opposite side of the main cutting edge 34a. The wiping blade 34b may extend on a virtual plane perpendicular to the insert axis. The blade length of the wiping blade 34b in the standard processing insert 30 is set to be smaller than the blade length of the main cutting edge 34a, specifically, half or less of the blade length of the main cutting edge 34a.
The corner blade 34d has a convex curve shape that is convex outward in the insert radial direction.

  Of the pair (two sets) of cutting blade assemblies adjacent in the circumferential direction along the outer periphery of the front and back surfaces 32, the connecting blade 34c of one cutting blade assembly is the main cutting of the one cutting blade assembly. The blade 34a and the wiper blade 34b of the other cutting blade assembly are smoothly connected. The connecting blade 34c is inclined and extended toward the outer side of the insert gradually along the axial direction of the insert as it goes to the wiping blade 34b of another cutting blade assembly on the side opposite to the main cutting edge 34a adjacent to the connecting blade 34c. Yes. In addition, since the connection blade 34c is not a blade cut into a work material, the cutting edge may not be formed at an acute angle.

  Further, the front and back surfaces 32 are formed around the mounting hole 35 so as to be connected to the inside of the cutting edge 34 in the insert radial direction and extend along the cutting edge 34, and to be positioned inside the insert radial direction of the breaker 36. And a seating portion 37.

  The seat portion 37 is formed in an annular shape extending in the insert circumferential direction so as to surround the attachment hole 35 on the front and back surfaces 32. The seat portion 37 is formed in a circular flat shape perpendicular to the insert axis. Specifically, the seat portion 37 is formed corresponding to the shape of the bottom portion 8 of the insert mounting seat 3 to which the standard processing insert 30 is mounted. In the example shown in the drawing, a cutting edge index portion 38 that is an index (mark) of the used cutting edge assembly of the cutting edges 34 is formed on the seating portion 37.

  The breaker 36 is formed inside the cutting edge 34 on the front and back surfaces 32 and adjacent to the cutting edge 34. The breaker 36 has a groove shape or an inclined surface shape extending along the cutting edge 34. The breaker 36 is formed between the seating portion 37 and the cutting edge 34 on the front and back surfaces 32. In the present embodiment, the breaker 36 is formed on the peripheral edge of the front and back surface 32 over the entire circumference. And the breaker 36 is also formed in the peripheral part of the front and back 32 over the perimeter.

  The outer peripheral surface 33 is formed in parallel with the insert axis. The outer circumferential surface 33 includes a main cutting edge flank 33a continuous with the main cutting edge 34a, a wiping blade flank 33b continuous with the wiping edge 34b, a connecting blade flank 33c connected with the connecting edge 34c, and a corner edge connected with the corner edge 34d. And a flank 33d.

  The main cutting edge flank 33a has a planar shape. Specifically, a pair of main cutting edges 34a located at both ends in the insert axial direction are inclined with respect to the insert axis and extend parallel to each other. Correspondingly, it is formed in the shape of a parallelogram. That is, the main cutting edge flank 33a has a parallelogram-like surface shape extending obliquely to the left (downward to the right) when the main cutting edge flank 33a is viewed from the front.

  Further, in a state where the standard machining insert 30 is mounted on the insert mounting seat 3, the pair of wall portions 9, 10 of the insert mounting seat 3 are on the tool base end side on the outer peripheral surface 33 of the standard processing insert 30. A pair of main cutting edge flank surfaces 33a facing each other and adjacent to each other are brought into contact with each other. Corresponding to the shape (parallelogram surface shape) of the main cutting edge flank 33a, the wall portions 9, 10 of the insert mounting seat 3 are formed in the shape of a strip-shaped plane inclined as described above. ing.

The wiping blade flank 33b and the connecting blade flank 33c have a planar shape parallel to the insert axis, and have the same shape. Of the front and back surfaces 32, the wiping blade flank 33 b of the wiping blade 34 b positioned at the peripheral edge of the front surface 32 is a connecting blade flank 33 c of the connecting blade 34 c positioned at the peripheral edge of the back surface 32.
The corner blade flank 33d is formed in a convex curved surface that is parallel to the insert axis and is convex outward in the insert radial direction.

  Although not particularly illustrated, the clamp screw 20 includes a screw shaft portion that has been subjected to male screw processing and a head portion that has a larger diameter than the screw shaft portion. The screw shaft portion of the clamp screw 20 is screwed into the female screw hole 11 of the insert mounting seat 3.

In the state where the standard machining insert 30 is mounted on the insert mounting seat 3 of the tool body 2 using the clamp screw 20, either one of the front and back surfaces 32 is arranged facing the front in the tool rotation direction T. And rake face. In addition, the other of the front and back surfaces 32 is arranged facing the rear in the tool rotation direction T, and serves as a seating surface seated on the bottom 8 of the insert mounting seat 3.
Specifically, one of the seating portions 37 of the front and back surfaces 32 is brought into contact with the bottom portion 8.

  When this insert 30 for standard machining is mounted on the tool body 2 of the blade-type replaceable face mill 1 and the work material is face milled, the insert 30 is used as the rake face (that is, the tool 30). In the cutting edge 34 that forms the outer periphery of the front surface 32 or the back surface 32 (facing the rotation direction T), one cutting edge assembly located at the outer periphery of the tip of the tool body 2 is subjected to cutting. Of the one cutting edge assembly, the finishing blade 34b provided for improving the finished surface of the work material is arranged in a virtual plane perpendicular to the tool axis O of the tool body 2. Is done.

As shown in FIGS. 6, 7, and 9 to 11, the cutting surface of the work material among the plurality of types of cutting inserts 30 and 40 that are mounted on the blade-tip replaceable face mill 1 of the present embodiment. The wiper insert 40 used for the finishing process has a polygonal plate shape, and the insert body 41 having a reverse-inverted symmetrical shape, the front and back surfaces 42 of the insert body 41, and the peripheral edges of these front and back surfaces 42 in the insert axis C direction. , And an outer peripheral surface 43 connected so as to extend along the edge, and a cutting edge 44 formed at a cross ridge line portion between the front and rear surfaces 42 and the outer peripheral surface 43.
That is, this wiper insert (cutting insert) 40 is a double-sided type face milling cutting insert.

  In FIG. 10A, the insert body 41 of the present embodiment has a pentagonal plate shape as a basic shape. Specifically, two corners of the pentagonal plate are chamfered. It has a heptagonal plate shape. Correspondingly, the front and back surfaces 42 have a pentagonal surface shape as a basic shape. Specifically, two corners of the pentagonal surface are chamfered so that a heptagonal surface shape is obtained. I am doing.

  The insert main body 41 is formed with a mounting hole 45 that passes through the insert main body 41 in the direction of the insert axis C along the thickness direction and is opened at the approximate center of the front and back surfaces 42 (on the insert axis C). In FIG. 11B, the inner diameter of the mounting hole 45 is the largest at both ends in the insert axis C direction, and gradually decreases or gradually decreases from the both ends toward the center in the insert axis C direction. It has become.

  10A, the insert main body 41 passes through the center of a second corner blade flank 43d, which will be described later, corresponding to the acute angle corners of the front and back surfaces 42 forming the pentagonal basic shape of the outer peripheral surface 43, and the insert axis C The insert body 41 and the wiper insert 40 have a reverse-inverted symmetrical shape.

  In the present embodiment, the front and back surfaces 42 are formed in a substantially pentagonal surface shape having five sides and five corners. More specifically, the front and back surfaces 42 are five long sides that constitute the side portions. And two short sides constituting the corner and three corner R portions, and when the two short sides are included in the side, the heptagonal surface is formed as described above. A pair of cutting blade assemblies each having two long sides (a main cutting blade 44a and a wiping blade 44b described later) and one corner R portion (a first corner blade 44c described later) positioned therebetween. However, two (two sets) are arranged so as to be line-symmetrical with respect to the symmetry axis A on the front and back surfaces 42.

A cutting edge 44 is formed at the peripheral portion of the front and back surfaces 42 (specifically, the outer peripheral portion, the intersecting ridge line portion between the front and back surfaces 42 and the outer peripheral surface 43).
The cutting edge 44 is formed in a region corresponding to three corner R portions and four long sides connected to each other through the corner R portions in the peripheral portion of the front and back surfaces 42. The cutting blade 44 includes a pair of wiping blades 44b adjacent to each other and extending in different directions.
10A, when the front and back surfaces 42 of the insert body 41 are viewed from the front, the front and back surfaces 42 are respectively imaginary bisectors of the corners between the pair of sweeping blades 44b (that is, in this front view, respectively). It is a line-symmetrical shape with a symmetric axis A as a virtual bisector of a corner formed between a pair of straightening blades 44b forming a straight line.

Two sets (that is, a total of 4 sets) of the cutting blades 44 constituting each cutting edge 44 on the front surface 42 and the back surface 42 are respectively viewed from the front of the main cutting edge 44a used for main cutting and the front and back surfaces 42. The main cutting edge 44a extends so as to form an obtuse angle, and the finish cutting edge 44b provided to improve the finished surface of the work material, and the main cutting edge 44a and the edge cutting edge 44b are made smooth. And a curved first corner blade 44c to be connected. Further, in the two sets of cutting blade assemblies adjacent to each other with the symmetry axis A interposed therebetween, the respective cutting blades 44b are smoothly connected by the curved second corner blade 44d.
The first corner blade 44c desirably has a radius of curvature (and blade length) equal to or greater than that of the corner blade 34d of the standard machining insert 30.

  The main cutting edge 44a of one set of cutting edge assemblies is a wiping edge 44b adjacent to the main cutting edge 44a (in this embodiment, the wiping adjacent to the main cutting edge 44a with the first corner edge 44c interposed therebetween. As the distance from the blade 44b) increases, the blade gradually inclines toward the inner side of the insert along the direction of the insert axis C, so that the main cutting edge 44a is attached regardless of the mounting position of the wiper insert 40 on the insert mounting seat 3. It is easy to give a positive (positive) angle.

Further, in the set of cutting blade assemblies, the wiping blade 44b is arranged and extends on a virtual plane perpendicular to the insert axis C. The blade length of the wiper blade 44b in the wiper insert 40 is equal to or greater than the blade length of the main cutting edge 44a. Specifically, in this embodiment, the blade length is larger than the blade length of the main cutting edge 44a. .
Moreover, the 1st, 2nd corner blades 44c and 44d have comprised the convex curve shape which becomes convex toward the outer side of an insert radial direction.

  Further, the front and back surfaces 42 are formed around the mounting hole 45 so as to be continuous with the inner side of the cutting edge 44 in the insert radial direction and extend along the cutting edge 44, and to be positioned inside the insert radial direction of the breaker 46. And a seating portion 47.

  The seating portion 47 is formed in an annular shape extending in the insert circumferential direction so as to surround the attachment hole 45 on the front and back surfaces 42. The seating portion 47 is formed in a circular plane shape perpendicular to the insert axis C. Specifically, the seating portion 47 is formed corresponding to the shape of the bottom portion 8 of the insert mounting seat 3 to which the wiper insert 40 is mounted.

  The breaker 46 is formed inside the cutting edge 44 on the front and back surfaces 42 and adjacent to the cutting edge 44. The breaker 46 extends along the cutting edge 44 and is formed in an inclined surface shape that gradually inclines toward the inner side of the insert along the insert axis C direction from the cutting edge 44 toward the inner side in the insert radial direction. The breaker 46 may have a groove shape extending along the cutting edge 44. The breaker 46 is formed between the seating portion 47 and the cutting edge 44 on the front and back surfaces 42.

  Further, the relative position between the seating portion 47 formed on the same surface (the front surface 42 or the back surface 42) of the front and back surfaces 42 and the cutting edge 44 is relative to the cutting edge 44 as shown in FIG. The seat 47 is disposed inside the insert along the insert axis C direction of the insert body 41.

  9 to 11, the front and back surfaces 42 are located on the front and back surfaces 42 of the peripheral edge (peripheral edge portion) at a distance from the wiping blade 44 b and facing the tool tip side of the insert mounting seat 3. A protrusion 48 is formed in a portion adjacent to an outer peripheral surface 43 portion (a contact surface 43 e described later) of the insert main body 41 that contacts the portion 10. Specifically, the protrusion 48 of the present embodiment is disposed on the opposite side of the peripheral edge of the front and back surfaces 42 with the pair of wiping blades 44b and the second corner blades 44d sandwiching the insert axis C.

  The protrusion 48 has a rib shape extending along the insert circumferential direction. Further, the surface of the protrusion 48 facing the inner side in the insert radial direction has a concave curved surface shape that is recessed toward the outer side in the insert radial direction, and the surface facing the outer side in the insert radial direction is formed in a flat shape. Specifically, the surface of the protrusion 48 that faces the wall 10 facing the tool tip side of the insert mounting seat 3 (the surface of the protrusion 48 facing the outer side in the insert radial direction) abuts on the wall 10. The insert body 41 is formed to be flush with the outer peripheral surface 43 portion (contact surface 43e) without any step.

10 (a) and 10 (b), the both end portions along the insert circumferential direction of the protrusion 48 gradually decrease in height along the insert axis C direction as they are separated from the symmetry axis A along the insert circumferential direction. Also, the width along the insert radial direction is large.
11A and 11B, the protrusion 48 gradually increases in height along the insert axis C direction as it goes outward in the insert radial direction.

  The outer peripheral surface 43 is formed in parallel with the insert axis C. The outer peripheral surface 43 includes a main cutting edge flank 43a continuous with the main cutting edge 44a, a wiping edge flank 43b continuous with the wiping edge 44b, a first corner edge flank 43c connected with the first corner edge 44c, and a second corner. Adjacent to the second corner blade clearance surface 43d connected to the blade 44d, the contact surface 43e contacted with the wall portion 10 facing the tool tip side of the insert mounting seat 3, and both sides of the contact surface 43e in the insert circumferential direction. A pair of chamfered surfaces 43f.

  The main cutting edge flank 43a has a planar shape. Specifically, a pair of main cutting edges 44a located at both ends in the direction of the insert axis C are inclined in opposite directions with respect to the insert axis C. Corresponding to this, it is formed in a trapezoidal surface. In other words, the main cutting edge flank 43a is seen from the front edge flank 43a to the chamfered surface 43f side (abutment surface 43e side) along the circumferential direction of the insert as viewed from the front of the main cutting edge flank 43a. A trapezoidal surface is formed in which the width along the direction of the insert axis C gradually decreases.

The wiping blade flank 43b has a planar shape, and is specifically formed in a rectangular shape. That is, the wiping blade flank 43b has a rectangular surface shape with a constant width along the insert axis C direction over the entire length in the insert circumferential direction when the wiping blade flank 43b is viewed in front.
The first and second corner blade flank surfaces 43c and 43d are formed in convex curved surfaces that are parallel to the insert axis C and are convex outward in the insert radial direction.

Further, as shown in FIG. 10A, when the front and back surfaces 42 are viewed from the front, the contact surface 43e is formed to be perpendicular to the main cutting edge flank 43a. As shown in FIG. 10B, the contact surface 43e has a rectangular shape when the contact surface 43e is viewed from the front.
The chamfered surface 43f is disposed between the main cutting edge clearance surface 43a and the contact surface 43e, and is formed so as to intersect with each other so as to form an obtuse angle. In the illustrated example, the chamfered surface 43f has a rectangular surface shape.

  While the wiper insert 40 is mounted on the insert mounting seat 3, the wiper insert 40 is positioned on the inner side in the tool radial direction of the pair of wall portions 9, 10 of the insert mounting seat 3, and is positioned in the tool tip side and the tool radial direction. A main cutting edge flank 43a that faces the tool proximal end and faces the inner side in the tool radial direction on the outer peripheral surface 43 of the wiper insert 40 is in contact with the wall portion 9 facing outward. Further, of the pair of wall portions 9, 10 of the insert mounting seat 3, the outer wall of the wiper insert 40 is disposed on the wall portion 10 that is located on the outer side in the tool radial direction and faces the tool tip side and the inner side in the tool radial direction. On the surface 43, an abutting surface 43e facing the tool base end side and facing the outer side in the tool radial direction is abutted.

6 and 7, when the wiper insert 40 is mounted on the insert mounting seat 3 of the tool body 2 using the clamp screw 20, one of the front and back surfaces 42 is the front in the tool rotation direction T. It is arranged to face and is a rake face. In addition, the other of the front and back surfaces 42 is disposed facing the rear in the tool rotation direction T, and serves as a seating surface seated on the bottom 8 of the insert mounting seat 3.
Specifically, one of the seating portions 47 of the front and back surfaces 42 is in contact with the bottom portion 8.

  When this wiper insert 40 is mounted on the tool body 2 of the blade-tip replaceable face mill 1 and the work material is face milled, it is set as the rake face of the front and back surfaces 42 of the insert 40 (that is, the tool rotation direction). In the cutting edge 44 that forms the outer periphery of the front surface 42 or the back surface 42 (facing T), one cutting edge assembly located at the outer periphery of the tip of the tool body 2 is used for cutting. Of the one cutting edge assembly, the finishing blade 44b provided for improving the finished surface of the work material is disposed in a virtual plane perpendicular to the tool axis O of the tool body 2. Is done.

  According to the wiper insert 40 of the present embodiment described above and the cutting edge-exchangeable face mill 1 using the same, the shape of the insert mounting seat 3 is made common without changing depending on the type of the cutting inserts 30 and 40. (Standard insert 30 and wiper insert (finishing insert) 40 have the same shape without separate insert mounting seats 3), ease of manufacture of tool body 2, cutting insert into tool body 2 Easy mounting of 30 and 40 and various cutting conditions (for example, not only when one wiper insert 40 is provided on the tool body 2 but also when two or three wiper inserts 40 are used according to high feed) The insert mounting seat 3 to which the wiper insert 40 is mounted is improved while improving the ease of handling. The progress of the wear of the wall 10 facing the tool distal end side of the over preparative attaching seat 3 can be remarkably suppressed.

Specifically, conventionally, as shown in FIGS. 12 to 15, when the standard processing insert 103 and the wiper insert 104 are respectively attached to the plurality of insert mounting seats 102 having the same shape, In the insert mounting seat 102 to which the wiper insert 104 is mounted, a part of the wall portion 102a facing the tool front end side is exposed, and there is a possibility that it is abraded by chips and worn.
This is because the insert 103 for standard machining has a 90 ° rotationally symmetric shape around the insert axis and a reverse-inverted symmetrical shape, and the width of the outer peripheral surface of the insert body (the length in the direction connecting the front and back surfaces) is Whereas the entire surface is substantially constant, the wiper insert 104 has a rotationally symmetrical shape around the insert axis, for example, due to the necessity of making the length of the wiping blade 104a longer than the feed amount per tool rotation. In view of the fact that it is difficult to form and the material cost of manufacturing, etc., the width of the portion corresponding to the wiping blade 104a (adjacent portion) of the outer peripheral surface of the insert body corresponds to the wiping blade 104a. This is because the width of the part that does not exist (specifically, the part that comes into contact with the wall part 102a facing the tool tip side of the insert mounting seat 102, the contact surface) is reduced.

  In particular, as described in the present embodiment, the main cutting edge 34a of the standard machining insert 30 is set to a positive angle (inclined so that the main cutting edge 34a has a positive angle with respect to a plane perpendicular to the insert axis. The outer peripheral surface 33 portion (main cutting blade relief surface 33a) of the insert main body 31 corresponding to the main cutting edge 34a is also inclined, so that it contacts the outer peripheral surface 33 portion. The wall portion 10 facing the tool front end side of the insert mounting seat 3 to be made is also formed to be inclined. When the conventional wiper insert 104 is attached to the insert mounting seat 3 having the inclined wall portion 10 as described above, the above-described exposure is likely to occur and the problem of wear tends to be remarkable. When the wall portion 10 of the insert mounting seat 3 is abraded and worn by chips, when the insert 103 for standard processing is next mounted on the insert mounting seat 3, seating stability cannot be ensured, which affects the processing accuracy. There are things to do.

  Therefore, in the present embodiment, the outer peripheral surface 43 portion of the insert main body 41 that is brought into contact with the wall portion 10 facing the tool tip side of the insert mounting seat 3 among the peripheral edges of the front and back surfaces 42 of the insert main body 41 of the wiper insert 40 ( A protrusion 48 is provided in a portion adjacent to the contact surface 43e), and as shown in FIGS. 6 and 7, the wall portion 10 of the insert mounting seat 3 is covered by the protrusion 48 to prevent exposure. Thus, scraping of the chips against the wall portion 10 is prevented. In addition, since the outflow direction of the chips can be changed by the protrusions 48, it is possible to more reliably prevent the scrapes of the chips from rubbing against the wall portion 10. That is, the chips generated by cutting the work material by the wiping blade 44 b flow on the front and back surfaces 42 of the insert body 41 and are applied to the projections 48, so that the direction is changed, and the wall portion of the insert mounting seat 3. 10 is more remarkably prevented and the progress of wear is suppressed.

  As described above, according to the present embodiment, the shapes of the plurality of insert mounting seats 3 are made common without distinguishing between the standard processing insert 30 and the wiper insert 40, and the ease of manufacture of the tool body 2, While improving the ease of mounting of the cutting inserts 30 and 40 and the ease of handling various cutting processing conditions, the wear of the wall portion 10 facing the tool front end side of the insert mounting seat 3 to which the wiper insert 40 is attached is reduced. Therefore, the accuracy of the cutting process by the cutting inserts 30 and 40 mounted on the insert mounting seat 3 can be stably maintained at a high quality.

  Moreover, in this embodiment, the surface (end surface which faces the outer side of insert radial direction) which faces the said wall part 10 of the insert mounting seat 3 among the protrusion parts 48 is the outer peripheral surface of the insert main body 41 contact | abutted to this wall part 10 Since it is formed so as to be flush with the 43 portion (abutment surface 43e), the protruding portion together with the outer peripheral surface 43 portion of the insert body 41 with respect to the wall portion 10 facing the tool tip side of the insert mounting seat 3 48 can be brought into contact. In other words, the insert body 41 can be brought into contact with the wall portion 10 in a wide range while exhibiting the effect of suppressing the above-described wear of the wall portion 10 by the protruding portion 48, and the seating stability of the wiper insert 40 can be improved. Will improve.

Further, in the present embodiment, the wiper insert 40 is a line in which the front and back surfaces 42 of the insert main body 41 are viewed from the front, and the front and back surfaces 42 have a virtual bisector at the corner between the pair of wiping blades 44b as the symmetry axis A. Since it is symmetric, the following effects are obtained.
That is, in this case, the same wiper insert 40 is used regardless of whether the tool rotation direction T of the tool body 2 is in one or the other direction around the tool axis O (that is, regardless of whether it is right-handed or left-handed). Can be shared.

In the present embodiment, the cutting edges 34 and 44 of the standard processing insert 30 and the wiper insert 40 form an obtuse angle with the wiping edges 34b and 44b when the front and back surfaces 32 and 42 are viewed from the front. The main cutting edges 34a, 44a include extending main cutting edges 34a, 44a. The main cutting edges 34a, 44a extend toward the inner side of the insert along the insert axis C direction of the insert bodies 31, 41 as they are separated from the wiping edges 34b, 44b. Has the effect of.
That is, in this case, even if the mounting position of the standard processing insert 30 and the wiper insert 40 is set to a position in which the axial rake angle is negative (negative) with respect to the insert mounting seat 3 (that is, the insert axis C is forward of the tool rotation direction T). The main cutting edges 34a and 44a of the inserts 30 and 40 can be set to a positive (positive) angle even when extending toward the tool tip side toward the tool. Therefore, among the cutting edges 34 and 44 of the cutting inserts 30 and 40, the sharpness of the main cutting edges 34a and 44a can be enhanced while ensuring the cutting edge angle of the wiping blades 34b and 44b and ensuring the edge strength. is there.

  In the case of the above configuration, the main cutting edge 44a of the wiper insert 40 is inclined so that the portion of the outer peripheral surface 43 of the insert body 41 that comes into contact with the wall 10 facing the tool tip side of the insert mounting seat 3 ( It is conceivable that the width of the insert body 41 (the outer peripheral surface 43 portion) (the length in the direction of the insert axis C connecting the front and back surfaces 42) becomes smaller, but the wiper insert 40 of the present embodiment has a protrusion as described above. 48 is provided, the exposure of the wall portion 10 of the insert mounting seat 3 to which the wiper insert 40 is mounted can be reliably prevented.

Moreover, in this embodiment, since the insert main bodies 31 and 41 of the cutting inserts 30 and 40 are each made into the reverse inversion symmetrical shape, the cutting blades 34 and 44 are the surfaces 32 and 42 and the outer peripheral surface of the insert main bodies 31 and 41, respectively. The number of cutting edges 34 and 44 that can be used is doubled by forming not only on the intersection ridge line portion with 33 and 43 but also on the intersection ridge line portion between the back surface 32 and 42 and the outer peripheral surface 33 and 43. The tool life can be extended significantly.
The present embodiment is not limited to this, and the cutting edges 34 and 44 of the cutting inserts 30 and 40 intersect at least the front surfaces 32 and 42 and the outer peripheral surfaces 33 and 43 of the front and back surfaces 32 and 42. It suffices if it is formed in the ridge line portion, and may not be formed in the intersecting ridge line portion between the back surfaces 32 and 42 and the outer peripheral surfaces 33 and 43. That is, the cutting inserts 30 and 40 do not have to have a front-back inversion symmetrical shape.

In the present embodiment, the front and back surfaces 42 of the wiper insert 40 are formed with seating portions 47 that contact the bottom portion 8 of the insert mounting seat 3 facing the tool rotation direction T, and are formed on the same surface 42 of the front and back surfaces 42. Since the seating portion 47 is disposed inside the insert along the insert axis C direction with respect to the cutting edge 44, the relative position between the seating portion 47 and the cutting edge 44 thus produced has the following effects.
That is, in this case, as shown in FIG. 11B, the front and back surfaces 42 of the insert body 41 are inserted along the insert axis C direction from the seating portion 47 formed on the same surface 42 toward the cutting edge 44. As a result, the rake angle of the cutting edge 44 can be easily secured to be positive (positive), and the sharpness can be enhanced. In addition, since the distance L along the insert axis C direction between the cutting edge 44 on the front surface 42 (or the back surface 42) and the seating portion 47 on the back surface 42 (or the front surface 42) can be reduced, the cutting edge 44 reduces the cutting resistance during cutting. It is possible to reduce the moment generated by this, and the seating stability is improved.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, in the above-described embodiment, the surface facing the outer side in the insert radial direction of the protrusion 48 of the wiper insert 40 (the surface facing the wall portion 10 of the insert mounting seat 3) is in contact with the outer peripheral surface 43 of the insert body 41. Although the surface 43e is formed flush with the surface 43e, the present invention is not limited to this and may not be formed flush with the surface 43e. That is, a stepped portion is provided between the surface of the protrusion 48 facing the outside in the insert radial direction and the contact surface 43e, or the surface of the protrusion 48 facing the outside in the insert radial direction is the contact surface 43e. It may be an inclined surface inclined with respect to.

  In addition, even if the mounting orientation of the cutting inserts 30 and 40 to the insert mounting seat 3 is negative, the main cutting edges 34a and 44a of the cutting inserts 30 and 40 are inclined and extend so as to have a positive angle. However, the present invention is not limited to this. That is, the main cutting edges 34a and 44a may be disposed in a virtual plane perpendicular to the insert axis C, for example.

  Further, in the above-described embodiment, the main cutting edge 44a of the wiper insert 40 is used for the cutting of the work material similarly to the main cutting edge 34a of the other standard processing insert 30. The 40 main cutting edges 44a may not be used for cutting.

  Moreover, in the above-mentioned embodiment, the seating part 47 is arrange | positioned rather than the cutting edge 44 in the insert inner side along the insert axis C direction among the seating part 47 and the cutting edge 44 formed in the same front and back surface 42. However, the present invention is not limited to this. That is, the seating portion 47 may have the same position along the insert axis C direction with respect to the cutting edge 44, or may be disposed outside the insert along the insert axis C direction with respect to the cutting edge 44.

  Also, what is shown in FIG. 4 is a reference example of the present invention. In this example, standard inserts 30 are attached to all the insert mounting seats 3. Although not particularly illustrated, in the present invention, wiper inserts 40 may be attached to all insert mounting seats 3 and used for cutting. Thus, it is also possible to use the blade-tip replaceable face mill 1 in which only one of the wiper insert 40 and the standard processing insert 30 is attached to the plurality of insert mounting seats 3 of the tool body 2.

  In addition, in the range which does not deviate from the meaning of this invention, you may combine each structure (component) demonstrated by the above-mentioned embodiment, a modified example, a note, etc., addition of a structure, omission, substitution, others It can be changed. Further, the present invention is not limited by the above-described embodiments, and is limited only by the scope of the claims.

1 Cutting edge replaceable face mill 2 Tool body 3 Insert mounting seat 8 Bottom 10 Wall 30 Insert for standard machining (cutting insert)
40 Wiper insert (cutting insert)
41 insert body 42 front and back 43 outer peripheral surface 43e contact surface (outer peripheral surface portion of insert main body)
44 Cutting edge 44a Main cutting edge 44b Flat blade 47 Seating part 48 Protruding part A Symmetry axis C Insert axis O Tool axis T Tool rotation direction

Claims (8)

A plurality of cutting inserts that are detachably mounted on insert mounting seats that are provided in the outer peripheral portion of the tip of the tool body that is rotated around the tool axis at intervals in the circumferential direction of the tool and that have the same shape. Among them, a wiper insert used for finishing a cutting surface of a work material,
An insert body having a pentagonal plate shape;
Front and back surfaces of the insert body, and outer peripheral surfaces connecting the peripheral edges of these front and back surfaces,
Having at least the surface of the front and back surfaces, and a cutting edge formed at the intersecting ridge line portion with the outer peripheral surface,
The surface has five sides and five corners;
The cutting edge is formed in a region corresponding to the four side portions and the three corner portions,
The cutting edge has a wiping edge that can be arranged in a virtual plane perpendicular to the tool axis,
Of the peripheral edge on the surface, the protrusion is located at a portion adjacent to the outer peripheral surface portion of the insert body that is positioned away from the wiping blade and abuts against the wall portion facing the tool tip side of the insert mounting seat. Formed ,
The wiper insert according to claim 1, wherein the protrusion is disposed on one of the side portions where the cutting edge is not formed . The wiper insert according to claim 1,
The wiper characterized in that a surface of the protrusion that faces the wall portion of the insert mounting seat is formed to be flush with an outer peripheral surface portion of the insert body that abuts the wall portion. insert. The wiper insert according to claim 1 or 2,
The cutting blades include a pair of wiping blades that are adjacent to each other and extend in different directions,
The wiper insert according to claim 1, wherein the surface of the insert body has a line-symmetric shape with an imaginary bisector of an angle between a pair of the wiper blades as an axis of symmetry when viewed from the front. The wiper insert according to any one of claims 1 to 3,
The cutting edge includes a main cutting edge extending so as to form an obtuse angle with the wiping edge when the surface is viewed in front,
The wiper insert according to claim 1, wherein the main cutting edge extends toward the inner side of the insert along the insert axial direction of the insert body as the main cutting edge moves away from the wiping edge. The wiper insert according to any one of claims 1 to 4,
The wiper insert according to claim 1, wherein the insert body has a symmetrical shape. The wiper insert according to claim 5, wherein
On the front and back surfaces, a seating portion that is in contact with the bottom of the insert mounting seat facing the tool rotation direction is formed,
The relative position between the seating portion and the cutting edge formed on the same surface of the front and back surfaces is such that the seating portion is disposed inside the insert along the insert axial direction of the insert body with respect to the cutting blade. A wiper insert characterized by   The wiper insert according to any one of claims 1 to 6,
  The protrusion is a rib shape extending in the insert circumferential direction around the insert axis,
  The surface facing the inner side of the insert radial direction perpendicular to the insert axis of the protrusion portion has a concave curved surface that is recessed toward the outer side of the insert radial direction,
  The wiper insert according to claim 1, wherein the protrusion gradually increases in height along the insert axial direction as it goes outward in the insert radial direction. A tool body that can be rotated about the tool axis;
A plurality of insert mounting seats provided at the tip outer periphery of the tool main body at intervals in the tool circumferential direction and having the same shape as each other;
A plurality of cutting inserts detachably mounted on the insert mounting seat,
In the plurality of cutting inserts,
A standard machining insert used for standard machining of the cut surface of the work material;
And a wiper insert that has a different shape from the standard machining insert and is used for finishing the cutting surface of the work material,
A blade-tip-exchangeable face mill, wherein the wiper insert according to any one of claims 1 to 7 is attached to at least one of the plurality of insert mounting seats as the wiper insert.

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