JP2012187650A - Cutting insert and cutting edge replaceable cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiper insert equipped with a plurality of wiper blades for allowing the use of the wiper blades a plurality of times with one insert body.SOLUTION: A recessed portion 5 is formed in the center of at least one side face 3A out of side faces 3A-3D disposed around a pair of polygonal faces 2 of the insert body 1 having a polygonal flat shape. A pair of side faces of the one side face 3A parted by the recessed portion 5 are formed as flank faces 6, and rake faces 7 are formed on the other paired side faces 3B, 3D of the insert body 1 intersecting the flank faces 6, respectively. At intersecting ridges between each rake face 7 and each flank face 6, the pair of wiper blades 8 are formed sloping back down in alternate directions as extending from one side to the other side of each of the pair of polygonal faces 2 in a side view opposite to the other side faces 3B, 3D.

Description

  The present invention relates to a cutting insert used as a wiper insert that is attached to a cutting edge exchangeable cutting tool such as a milling cutter, and a cutting edge exchangeable cutting tool to which the cutting insert is detachably attached.

  As a cutting insert used as such a wiper insert and a cutting edge exchangeable cutting tool such as a milling cutter to which the cutting insert is attached, for example, the one described in Patent Document 1 is known. Such a wiper insert is attached to a part (usually one) of the plurality of insert mounting seats formed on the outer periphery of the tip end of the tool body of the cutting edge exchangeable cutting tool, and the wiper blade (Or wiper blade) should be along a plane perpendicular to the rotation axis of the tool body, and slightly protrude from the cutting edge of the other cutting insert attached to the other insert mounting seat. It is used to finish the processed surface processed by this other cutting insert smoothly.

JP 2002-192416 A

  By the way, in such a cutting tool with a wiper insert attached, the amount of cutting by the wiper blade is slightly smaller than the cutting edge of other cutting inserts. However, it is inevitable that the wiper blade is worn. Nevertheless, in the wiper insert described in Patent Document 1, only one wiper blade is formed. Therefore, if this one wiper blade is worn, the wiper insert itself must be replaced. Inefficient and uneconomical.

  The present invention has been made under such a background, and in the cutting insert used as the wiper insert as described above, a plurality of wiper blades are provided, and a plurality of wiper blades can be used in one insert body. An object of the present invention is to provide a cutting insert and a cutting edge exchangeable cutting tool to which the cutting insert is detachably attached.

  In order to solve the above-described problems and achieve such an object, the cutting insert of the present invention is applied to some of the insert mounting seats among a plurality of insert mounting seats formed on the tool body of the cutting edge exchangeable cutting tool. A cutting insert that is attached and used as a wiper insert, wherein a recess is formed at the center of at least one of the side surfaces disposed around a pair of polygonal surfaces of a polygonal flat plate insert body. The pair of side surfaces of the one side surface divided by the recesses are used as flank surfaces, and rake surfaces are respectively formed on the other side surfaces of the insert body intersecting with the flank surfaces. The crossing ridge line portion between each rake face and the flank face from one side of the pair of polygonal faces to the other side in a side view facing the other side face. Wherein a pair of wiper blades have extending obliquely to retract alternating orientation is formed.

  Further, the cutting edge replaceable cutting tool of the present invention has a cutting insert having the above-described configuration on some of the insert mounting seats formed on the outer periphery of the tip end portion of the tool body rotated around the axis, The rake face and the flank face formed on the one other side face with the one side face facing the tool tip side and one other side face of the pair of other side faces in the tool rotation direction. The wiper blades formed on the intersecting ridge lines are attached so as to extend along a plane perpendicular to the axis.

  In the cutting insert having the above-described configuration, a pair of side surfaces divided by a concave portion at the center portion are formed as flank surfaces on at least one side surface of the polygonal flat plate-like insert body, and these flank surfaces, A wiper blade is formed at a crossing ridge line portion with a rake face formed on a pair of other side surfaces of the insert main body that intersects the flank, that is, a pair of wiper blades are formed on the at least one side surface of the insert main body. Will be.

  And these wiper blades are inclined and extended so as to recede in a staggered direction from one side of the pair of polygonal surfaces to the other side in a side view facing the other side surface, Therefore, when the cutting insert is attached so that one of the pair of wiper blades extends along a plane perpendicular to the axis of the tool body of the cutting edge exchangeable cutting tool as described above, the other side of the pair is reversed. When the insert body is reattached so that the other of the pair of wiper blades extends along a plane perpendicular to the axis of the tool body, the orientation of the insert body with respect to the tool body is the same. be able to.

  For this reason, according to the cutting insert having the above-described configuration, it is possible to arrange the pair of wiper blades so as to extend along a plane perpendicular to the axis with respect to the at least one side surface by reattaching the insert body. In addition, the wiper insert can be used efficiently and economically. In addition, when the pair of wiper blades are inclined in a staggered direction in this way, the flank surfaces of the pair of side surface portions connected to the wiper blades are similarly inclined in a staggered direction. Since the concave portion is formed between the side surface portions, these flank surfaces do not interfere with each other.

  The wiper blade may be linear when viewed from the side facing the other side surface, but such a linear wiper blade is accurately arranged on a plane perpendicular to the axis of the tool body. To achieve this, the insert body and insert mounting seat must be formed with high precision. For example, if the wiper blade is tilted with respect to the plane and the insert body is attached, a feed mark is placed on the finished surface of the work material. There is a risk that it will be formed.

  Therefore, it is desirable that the wiper blade has a convex curve shape when viewed from the side facing the other side surface. By increasing the curvature radius of the convex curve, the finished surface of the work material has a curvature. Since the cross-sectional shape has a continuous concave curve with a large radius, it is possible to prevent the feed mark from being left on the finished surface even if the cutting blade is inclined due to the mounting accuracy of the wiper insert.

  As described above, according to the present invention, it is possible to use wiper blades formed in pairs for at least one side surface of one insert body by reattaching the insert body to the insert mounting seat, It is possible to increase the number of wiper blades that can be used in one insert body and perform efficient and economical cutting.

It is a perspective view which shows 1st Embodiment of the cutting insert of this invention. It is a top view when the embodiment shown in FIG. 1 is seen from the direction facing the polygonal surface of the insert body. It is a side view when the embodiment shown in FIG. 1 is seen from the direction (arrow A direction in FIG. 2) facing at least one side surface of the insert body. It is a side view when the embodiment shown in FIG. 1 is seen from the direction (arrow B direction in FIG. 2) facing one of a pair of other side surfaces of the insert body. It is a perspective view which shows the blade-tip-exchange-type cutting tool (milling cutter) of this invention. It is the bottom view which looked at the embodiment shown in FIG. 5 from the axial direction front end side of the tool main body. It is the side view which looked at embodiment shown in FIG. 5 from the arrow A direction in FIG. It is the side view which looked at embodiment shown in FIG. 5 from the arrow B direction in FIG. FIG. 6 is a perspective view showing a state where the wiper insert is removed in the embodiment shown in FIG. 5. It is a perspective view which shows 2nd Embodiment of the cutting insert of this invention. It is a top view when the embodiment shown in FIG. 10 is seen from the direction facing the polygonal surface of the insert body. It is a side view when the embodiment shown in FIG. 10 is seen from the direction (arrow A direction in FIG. 11) facing at least one side surface of the insert body. It is a side view when seeing embodiment shown in FIG. 10 from the direction (arrow B direction in FIG. 11) which opposes one side of a pair of other side surface of an insert main body.

  FIGS. 1 to 4 show a first embodiment of the cutting insert of the present invention, and FIGS. 5 to 9 show the cutting edge replacement of the present invention in which the cutting insert of the first embodiment is attached as a wiper insert. 1 shows an embodiment of a milling cutter which is a type cutting tool. The cutting insert of this embodiment has a pair of polygonal surfaces 2 in which the insert body 1 is formed of a hard material such as cemented carbide in a polygonal flat plate shape, specifically a substantially rectangular flat plate shape, that is, a substantially rectangular shape. And a plurality (four) of side surfaces 3 </ b> A to 3 </ b> D arranged around these polygonal surfaces 2.

  Here, the pair of polygonal surfaces 2 are parallel to each other and are perpendicular to the thickness direction of the insert body 1 (vertical direction in FIG. 3 and horizontal direction in FIG. 4). A mounting hole 4 that penetrates the insert body 1 in the thickness direction is opened. In the present embodiment, of the side surfaces 3A to 3D, the three side surfaces 3B to 3D extend in the thickness direction perpendicularly to the pair of polygonal surfaces 2 so that the shortest distance from the mounting hole 4 is reduced. Chamfering is applied to the intersecting ridge line portion between the side surface 3B and the side surface 3C and the intersecting ridge line portion between the side surface 3C and the side surface 3D.

  On the other hand, in the remaining one side surface 3A, a recess 5 is formed at the center of the side surface 3A as viewed from the direction facing the polygonal surface 2 so as to be recessed inside the insert main body 1. One side surface 3A is divided into a pair of side surface portions on the side surface 3B side and the side surface 3D side. Here, in this embodiment, the concave portion 5 is formed in an isosceles trapezoidal shape in which the width in the direction along the side surface 3A gradually decreases toward the inner side of the insert body 1 when viewed from the direction facing the polygonal surface 2. Yes.

  And in the intersection ridgeline part of this one side surface 3A and a pair of other side surface 3B and side surface 3D adjacent thereto, the pair of side surface parts of the side surface 3A thus divided are used as flank surfaces 6, respectively. A wiper blade 8 is formed in which a portion on the side surface 3A side of the pair of other side surfaces 3B and 3D crossing the flank 6 is a rake surface 7. That is, in the present embodiment, the wiper blades 8 are formed at both ends of the one side surface 3 </ b> A, and a pair of wiper blades 8 are formed in one insert body 1.

  Here, the portions of the side surfaces 3B and 3D of the wiper blades 8 on the side surfaces 3A and 3D on the side surface 3A side are formed so as to recede to the inner side of the insert body 1 as they are separated from the wiper blades 8. Then, after forming a concave curved surface and further retreating, it is cut out to the outside of the insert body 1 and is connected to the side surface 3C side portion of the pair of other side surfaces 3B and 3D. A portion of the side surface 3B, 3D on the side surface 3C side where the rake face 7 is not formed is a flat shape extending in a direction orthogonal to the side surface 3C.

  On the other hand, the pair of side surfaces which are the flank surfaces 6 of the wiper blades 8 are inclined so as to recede to the inside of the insert body 1 as they move away from the wiper blades 8 toward the concave portion 5 side of the central portion of the side surface 3A. In the above thickness direction, even between the pair of polygonal surfaces 2, an inclined surface is formed that is inclined toward the inside of the insert body 1. However, the inclined surface formed by the flank 8 between the pair of polygonal surfaces 2 is inclined to the inside of the insert body 1 while drawing a convex curved surface such as a convex arc surface having a large curvature radius in this embodiment. Yes. Further, a chamfered portion 9 is formed at the intersecting ridge line portion between the flank 6 and the polygonal surface 2 that protrudes to the outside of the insert body 1 in the thickness direction.

  Accordingly, the pair of flank surfaces 6 are formed in an inclined surface shape that is inclined in the thickness direction as described above. The pair of wiper blades 8 formed at the intersecting ridge line portions of the side surfaces 3B and 3D with the rake face 7 also extend so as to recede to the inside of the insert body 1 between the pair of polygonal surfaces 2. The direction in which the pair of flank surfaces 6 incline between the pair of polygonal surfaces 2 is staggered, and the direction in which the pair of wiper blades 8 inclines with this is also shown in FIG. In a side view when viewed from a direction facing the pair of other side surfaces 3B and 3D (side surface 3B in FIG. 4), the directions are staggered.

  That is, in this embodiment, as shown in FIG. 4, in a side view facing the side surface 3B of the pair of other side surfaces 3B and 3D, the crossed ridge line portion between the rake face 7 and the flank 6 on the side surface 3B side. The wiper blade 8A formed on the inner surface of the pair of polygonal surfaces 2 except for the chamfered portion 9 retreats toward the inside of the insert body 1 from the one polygonal surface 2A side toward the other polygonal surface 2B side. The wiper blade 8B formed at the intersecting ridge line portion between the rake face 7 and the flank face 6 on the opposite side surface 3D side is also a pair of polygonal surfaces 2 except for the chamfered portion 9. Among them, it extends so as to recede to the inside of the insert body 1 as it goes from the other polygonal surface 2B side to the one polygonal surface 2A side.

  The insert body 1 is formed in a symmetrical shape when the pair of polygonal surfaces 2 are inverted so that the directions of the other pair of side surfaces 3B and 3D are reversed, and as described above. The inclination angles of the inclined wiper blades 8A and 8B with respect to the thickness direction are equal to each other. In the present embodiment, the flank 6 is a convex curved surface as described above, so that the wiper blade 8 also draws a convex curve such as a large convex arc having a radius of curvature of, for example, about 300 mm, and a pair of polygonal surfaces 2. It inclines so that it may retreat inside the insert main body 1 between.

  The cutting edge replaceable tool according to one embodiment of the present invention to which the cutting insert according to the first embodiment is attached has a tool body 11 having a distal end portion (lower portion in FIG. 6) as a proximal end portion (FIG. 6). In this case, the base end portion is attached to the main shaft of the machine tool and is rotated in the tool rotation direction T around the axis O while the axis O is rotated. By being sent in a direction perpendicular to the workpiece, for example, a work material such as cast iron is milled.

  A plurality of (12 in the present embodiment) chip pockets 12 are formed on the outer periphery of the tip of the tool body 11 at equal intervals in the circumferential direction, and adjacent to the rear side in the tool rotation direction T of these chip pockets 12. The insert mounting seats 13 are formed so as to open. The remaining insert mounting seats 13 except for a part (one in this embodiment) of these insert mounting seats 13 are formed with a machining surface exclusively on the work material. The other cutting insert is attached, and the cutting insert of the first embodiment, which is the wiper insert that finishes the processed surface of the work material thus formed, is attached to the part of the insert mounting seats 13.

  Here, these insert mounting seats 13 have the same shape and size in the present embodiment, and rotate so as to coincide with each other when the tool body 11 is rotated around the axis O by a predetermined angle. A flat bottom surface 13A that is formed symmetrically and faces the outer peripheral side of the tool body 11, and a wall surface 13B that faces the tool rotation direction T and that is perpendicular to the bottom surface 13A and perpendicular to each other. And a wall surface 13 </ b> C facing the front end side of the main body 11.

  The bottom surface 13A is directed toward the inner peripheral side as it goes toward the rear end side of the tool body 11, the wall surface 13B is directed toward the tool rotation direction T as it goes toward the rear end side, and the wall surface 13C is the tip as it goes toward the tool rotation direction T. Each is slightly inclined toward the side. Further, a screw hole 13D into which a clamp screw 14 for fixing each cutting insert is screwed is formed in the bottom surface 13A perpendicularly to the bottom surface 13A.

  Among these, the other cutting insert attached to the other insert mounting seat 13 is disclosed in, for example, Japanese Patent Application Laid-Open No. 2008-229744 by the inventors of the present invention. That is, the other cutting insert has an insert body 21 having a substantially square flat plate shape, and has two square surfaces and four side surfaces, and these two square surfaces are inserts that intersect the square surface. It arrange | positions so that it may twist around the centerline of the main body 21. FIG.

  Further, at each side ridge portion of these two square surfaces, a main cutting edge 22 having a rake face on the side surface and a square surface continuous to the side ridge portion is provided from one end portion of the side ridge portion. A secondary cutting edge 23 connected to the main cutting edge 22 is formed at one end of the one side ridge at the intersection ridgeline between adjacent side surfaces. . Accordingly, in this other cutting insert, eight sets of main cutting edges 22 and sub cutting edges 23 are formed in one insert main body 21 so that a total of eight cutting edges can be used.

  Further, on the four side surfaces, breaker grooves 24 are formed along the main cutting edge 22 on the two square surface sides, and a protrusion 25 is formed between the breaker grooves 24. ing. The projecting end surface of the projecting portion 25 is a flat surface along the thickness direction of the insert main body 21 to be a seating surface, and in the circumferential direction, two twist angles of two square surfaces are seen in the center line direction. It extends in the direction of equally dividing.

  In such another cutting insert, one of the two square surfaces is brought into close contact with the bottom surface 13A of the insert mounting seat 13, and the seating surfaces of the protrusions 25 on the two side surfaces adjacent in the circumferential direction are used as the insert mounting seat 13. The clamp screw 14 is inserted into a mounting hole 26 opened at the center of two square surfaces so as to be in contact with the wall surfaces 13B and 13C and to be seated on another insert mounting seat 13 and to penetrate the insert body 21. Then, it is fixed to the other insert mounting seat 13 by being screwed into the screw hole 13D of the bottom surface 13A.

  In the other cutting inserts thus attached to the other insert mounting seats 13, the main cutting edge 22 formed on the side ridge portion located on the tool rotation direction T side of the square surface directed to the outer peripheral side of the tool body 11. Then, the auxiliary cutting edge 23 connected to the main cutting edge 22 at the tip end side of the tool body 11 is used for cutting. At this time, the wall surfaces 13B and 13C of the insert mounting seat 13 are inclined as described above, and the two square surfaces are twisted, so that the main cutting edge 22 formed on the other side ridge portion and The sub cutting edge 23 connected to this does not interfere with the work material.

  And in the cutting insert of the said 1st Embodiment, the mutually equal shortest distance from the attachment hole 4 of the insert main body 1 to the three side surfaces 3B-3D, ie, the space | interval of the attachment hole 4 and the side surface 3C, and side surface 3B, 3D. The distance from the portion where the rake face 7 is not formed is equal to the distance between the mounting hole 26 of the other cutting insert and the protruding end face of the four side protrusions 25.

  Accordingly, the cutting insert according to the first embodiment also has one of the pair of polygonal surfaces 2 (the other polygonal surface 2B in FIGS. 5 to 8) closely contacted with the bottom surface 13A of the insert mounting seat 13 and the side surface. 3C can be seated on the wall surface 13C, and any one of the side surfaces 3B and 3D (side surface 3D in FIGS. 5 to 8) can be brought into contact with the wall surface 13B so as to be seated on the part of the insert mounting seats 13. The clamp screw 14 inserted into the screw hole 13D is screwed into the screw hole 13D to be fixed to this part of the insert mounting seat 13.

  In the cutting insert according to the first embodiment, which is attached to some of the insert mounting seats 13 to be a wiper insert, the side surface 3B opposite to the side surface 3D abutted against the wall surface 13B is the tool rotation direction T. A wiper blade 8A having a rake face 7 formed on the side surface 3B is used for finishing the processed surface. Here, the rake face 7 is formed on the opposite side surface 3D because the wall surfaces 13B and 13C of the insert mounting seat 13 are inclined in the same manner as other cutting inserts mounted on the other insert mounting seats 13. The wiper blade 8B is disposed on the rear end side of the tool body 11 with respect to the wiper blade 8A and does not interfere with the processing surface of the work material.

  Further, since the bottom surface 13A of the insert mounting seat 13 is inclined toward the inner peripheral side toward the rear end side of the tool main body 11 as described above, the pair of polygonal surfaces 2 of the insert main body 1 are also formed on the tool main body 11. As it goes to the rear end side, it is inclined to the inner peripheral side. Therefore, as shown in FIG. 8, in the side view facing the side surface 3 </ b> B of the insert body 1, the other polygonal surface 2 </ b> B that is in close contact with the bottom surface 13 </ b> A from the one polygonal surface 2 </ b> A side facing the outer peripheral side of the tool body 11. The wiper blade 8 </ b> A on the side surface 3 </ b> B side extending obliquely so as to recede to the inside of the insert body 1 as it goes to the side is along a plane perpendicular to the axis O of the tool body 11 when attached to the insert mounting seat 13. Will be placed.

  The plane perpendicular to the axis O of the tool body 11 on which the wiper blade 8A used for finishing the machining surface is arranged is slightly smaller than the auxiliary cutting blade 23 used for cutting the other cutting insert. The tool body 11 is positioned on the tip side. On the other hand, the insert main body 21 of the other cutting insert is slightly thicker than the insert main body 1 of the cutting insert of the first embodiment used as a wiper insert, and is used for cutting. The main cutting edge 22 and the auxiliary cutting edge 23 are positioned slightly on the outer peripheral side of the tool body 11 with respect to the wiper blade 8A.

  Therefore, when the tool main body 11 is rotated around the axis O as described above and sent out in a direction perpendicular to the axis O, first, the main cutting edge 22 of the other cutting insert thus positioned on the outer peripheral side of the tool main body 11 is first obtained. Further, the surface of the work material is cut by the auxiliary cutting edge 23 to form a machining surface, and then the wiper blade of the cutting insert of the above embodiment located slightly on the inner peripheral side of the main cutting edge 22 and the auxiliary cutting edge 23. 8A finishes this processed surface smoothly so as to be along the plane perpendicular to the axis O of the tool body 11.

  And in the cutting insert used as the wiper insert of the above-mentioned structure, a pair of wiper blades 8A, 8B of the insert body 1 is formed, and these wiper blades 8A, 8B are rake surfaces of the wiper blades 8A, 8B. In the side view opposite to the other side surfaces 3B and 3D of the insert body 1 in which the 7 is formed, the pair of polygonal surfaces 2A and 2B are inclined so as to recede in a staggered direction from one side to the other side. It is made to extend.

  For this reason, when the wiper blade 8A is damaged, such as wear, by finishing the processed surface as described above, the insert body 1 is attached to some insert mounting seats 13 so as to invert these other side surfaces 3B and 3D. By reattaching, the posture of the insert body 1 with respect to the tool body 11 can be made the same, and the wiper blade 8B on the opposite side can be used for finishing the processed surface. Therefore, according to the cutting insert having the above-described configuration, the pair of wiper blades 8A and 8B formed on the intersecting ridge line portion between the at least one side surface 3A and the other pair of side surfaces 3B and 3D by one insert body 1 are provided. It can be used, and an efficient and economical cutting process can be performed by effectively using an expensive insert body 1 made of a hard material such as a cemented carbide.

  Further, as described above, the wiper blades 8A and 8B are moved from one side of the pair of polygonal surfaces 2A and 2B to the other side in a side view facing the other side surfaces 3B and 3D on which the rake face 7 is formed. In order to incline so as to recede in a staggered direction as it goes, a pair of flank surfaces 6 formed on the at least one side surface 3A of the insert body 1 connected to the wiper blades 8A, 8B also incline in a staggered direction. In other words, these flank surfaces 6 are formed in a twisted surface.

  However, if such a pair of flank surfaces 6 is finished and formed by grinding with a grindstone, for example, the grindstone may interfere with the other flank surface 6 when the one flank face 6 is formed. However, in the cutting insert having the above-described configuration, these flank surfaces 6 are formed on a pair of side surfaces divided by the concave portion 5 formed in the central portion of the at least one side surface 3A. Therefore, the flank 6 can be formed reliably and accurately.

  Further, in the cutting insert having the above-described configuration, the rake face 7 is not the polygonal face 2 facing the thickness direction in which the dimension of the insert body 1 having a polygonal flat plate shape (substantially rectangular flat plate shape in the present embodiment) is small, Since it is a so-called vertical blade type cutting insert formed on the surrounding side surfaces 3B and 3D, the cutting load acting on the wiper blade 8 can be received in the direction in which the size of the insert body 1 is large. Even when an excessive load is applied in the milling of the work material, it is possible to prevent the wiper blade 8 from being chipped or chipped.

  Furthermore, in the cutting insert of the present embodiment, the wiper blade 8 has a convex curve shape with a large radius of curvature in a side view facing the other side surfaces 3B and 3D of the insert body 1 on which the rake face 7 is formed. Accordingly, the processed surface of the work material finished by the wiper blade 8 has a cross section in which concave curves having a large curvature radius are conversely formed. However, the wiper blade 8 may be linear as long as it is accurately arranged on a plane perpendicular to the axis O. However, if the linear wiper blade 8 is inclined with respect to this plane, A step is generated on the processed surface by the edge of the end of the wiper blade 8, and a so-called feed mark is formed.

  However, when the wiper blade 8 has a convex curve shape as in the present embodiment, even if the insert body 1 is attached with a slight inclination along the convex curve, the concave curve formed on the processing surface by the wiper blade 8. The cross section is not substantially different from the case where there is no inclination, and this concave curve also has a large radius of curvature, so that no step is formed on the processed surface and the formation of feed marks can be prevented. Therefore, according to this embodiment, it is possible to improve the finishing accuracy and quality of the processed surface.

  Furthermore, in the cutting insert of the first embodiment, the three side surfaces 3B to 3D of the insert body 1 excluding the one side surface 3A on which the flank surface 6 of the wiper blade 8 is formed have the pair of polygons. The portion of the pair of other side surfaces 3B and 3D where the rake face 7 is not formed is a planar shape extending in a direction perpendicular to the side surface 3C. In addition, these side surfaces 3B to 3D have the shortest distance from the mounting hole 4 equal to each other, and this shortest distance is in the insert main body 21 of the other cutting insert that is attached to the tool main body 11 of the cutting edge exchangeable cutting tool. It is made equal to the space | interval with the said protrusion end surface in the mounting hole 26 and the protrusion part 25 of four side surfaces.

  In other words, in the present embodiment, the contour formed by the three side surfaces 3B to 3D in a cross section perpendicular to the thickness direction of the insert body 1 is the projecting tip at the three projecting portions 25 among the four side surfaces of the other cutting insert. The surface is made to coincide with the contour formed in the cross section perpendicular to the thickness direction of the insert body 21, and other cutting inserts have two of these protruding end surfaces on the wall surfaces 13B and 13C of the insert mounting seat 13. Since it is fixed by the clamp screw 14 that is brought into contact with and inserted into the mounting hole 26, the cutting insert of the first embodiment used as a wiper insert is also the insert mounting seat of the tool body 11 to which the other cutting insert is mounted. 13 can be attached as it is.

  For this reason, in the tool main body 11 of a blade-tip-exchange-type cutting tool, it is only necessary to form a plurality of insert mounting seats 13 having the same shape and size as described above, and the manufacture thereof can be facilitated. Moreover, when cutting a work material without finishing the work surface by the wiper blade 8, it is sufficient to attach another cutting insert instead of the cutting insert of the above-described embodiment, which is a wiper insert, and a highly versatile cutting edge. An exchangeable cutting tool can be provided.

  However, in the said 1st Embodiment, the cutting insert of the said embodiment used as a wiper insert is attachable to the insert mounting seat 13 in which the other cutting insert of the tool main body 11 of a blade-tip-exchange-type cutting tool is attached in this way. However, since the insert mounting seat can have any shape depending on the insert shape, the mounting surface shape can be changed in accordance with the shape of the wiper insert. FIGS. 10 to 13 show a second embodiment of the cutting insert (wiper insert) of the present invention in such a case, and are parts common to the first embodiment shown in FIGS. 1 to 4. The same reference numerals are used for simplifying the description.

  That is, in the second embodiment, the concave portion 5 is also formed on the side surface 3C which is a flat surface along the thickness direction of the insert body 1 in the first embodiment opposite to the one side surface 3A. The pair of side surfaces are divided into a pair of side surfaces, and each of the pair of side surfaces is set as a flank 6 in the same manner as the side surface 3A. Each rake face 7 is formed, and the ridge line portion of each rake face 7 on the side face 3C side and the flank face 6 also has a side view facing the other side face 3B (or side face 3D) as shown in FIG. , A pair of wiper blades 8 are formed so as to incline and extend so as to recede in alternate directions from one side of the pair of polygonal surfaces 2 toward the other side.

  Here, the direction in which the wiper blade 8 formed on the side surface 3C side is inclined is opposite to the wiper blade 8 on the one side surface 3A side in a side view facing the other side surface 3B as shown in FIG. In addition, the wiper blade 8C on the side surface 3B side extends in a direction extending backward from the other polygonal surface 2B side to the one polygonal surface 2A side of the pair of polygonal surfaces 2 toward the inside of the insert body 1. On the other hand, the wiper blade 8D on the side surface 3D side is set so as to recede toward the inside of the insert body 1 from the one polygonal surface 2A side toward the other polygonal surface 2B side.

  And the insert main body 1 of the cutting insert of this 2nd Embodiment reverses a pair of polygonal surface 2 so that direction of said other side surface 3B, 3D may become reverse similarly to 1st Embodiment. In addition to being formed in a symmetric shape, the shape is also symmetric when the direction of the side surface 3A and the side surface 3C is reversed so that the orientation of the side surface 3C is reversed. It is made symmetrical even when it is rotated around the center line of the hole 4 by a predetermined angle (180 ° in this embodiment). Therefore, in such a cutting insert of the second embodiment, one insert main body 1 can be obtained by reversing or rotating the insert main body 1 in this manner and reattaching it to the insert mounting seat of the cutting edge exchangeable cutting tool. Thus, the wiper blade 8 can be used four times in total, which is more efficient and economical.

  In the second embodiment, the pair of side surfaces divided by forming the concave portion 5 on the side surface 3C is a flank surface 6, and the flank surfaces 6 are twisted surface like the first embodiment. Therefore, if the wall surface of the insert mounting seat facing the tip of the tool body is flat, the side surface 3C cannot be brought into contact. Therefore, in order to attach the cutting insert of the second embodiment, a wall portion of the cutter is formed on the wall portion of the insert mounting seat so as to form a convex portion that comes into contact with the concave portion 5 or according to the twisted surface of the flank 6. It is possible to attach the wiper insert without any trouble.

DESCRIPTION OF SYMBOLS 1 Insert body 2 (2A, 2B) Polygonal surface 3A-3D of the insert body 1 Side surface of the insert body 1 4 Mounting hole 5 Recess 6 Relief face 7 Rake face 8 (8A-8D) Wiper blade 11 Tool body 13 Insert mounting seat 14 Clamp Screw 21 Insert Body of Other Cutting Insert 22 Main Cutting Edge of Other Cutting Insert 23 Secondary Cutting Blade of Other Cutting Insert 25 Projecting Part of Other Cutting Insert 26 Mounting Hole of Other Cutting Insert O Tool Body 11 Axis of rotation T Direction of rotation of tool body 11

Claims (3)

  A cutting insert that is used as a wiper insert by being attached to some insert mounting seats among a plurality of insert mounting seats formed on a tool body of a cutting edge-exchangeable cutting tool, A recess is formed at the center of at least one of the side surfaces arranged around the pair of polygonal surfaces, and the pair of side surfaces divided by the recess serve as flank surfaces. In addition, a rake face is formed on each of the pair of other side surfaces of the insert body that intersects with these flank faces, and in a side view facing the other side face at the crossing ridge line portion between each rake face and the flank face. A pair of wiper blades that are inclined and extended so as to recede in a staggered direction from one side of the pair of polygonal surfaces toward the other side are formed. The cutting insert, characterized in that.   The cutting insert according to claim 1, wherein the wiper blade has a convex curve shape in a side view facing the other side surface.   The cutting insert according to claim 1 or 2, wherein a part of the plurality of insert mounting seats formed on the outer periphery of the tip end portion of the tool body rotated about the axis is provided with the one side surface. The other side surface of the pair of other side surfaces is directed in the direction of tool rotation, and the ridge line portion formed on the one other side surface and the flank surface intersect with each other. The blade-type exchangeable cutting tool, wherein the formed wiper blade is attached so as to extend along a plane perpendicular to the axis.

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