JP2016179542A - Cutting insert, cutting tool, and manufacturing method of workpiece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of requiring a cutting insert capable of excellently discharging chips even when having a flat cutting edge.SOLUTION: A cutting insert 1 based on one mode of the present invention comprises an upper surface 3, an under surface 5, a side surface 7 respectively connected to the upper surface 3 and the under surface 5, a flat cutting edge 13 positioned in an intersection part between the upper surface 3 and the side surface 7, a first main cutting edge 9, and a second main cutting edge 11. The flat cutting edge 13 is constant in height from the under surface 5, and is larger in an angle of inclination of the second main cutting edge 11 to the under surface 5 than that of the first main cutting edge 9 to the under surface 5 when viewed from a side, and is larger in an angle of inclination of the second main cutting edge 11 to the flat cutting edge 13 than that of the first main cutting edge 9 to the flat cutting edge 13 when viewed from above.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cutting insert, a cutting tool, and a method for manufacturing a workpiece.

  As a cutting tool used for cutting a workpiece, a rolling tool described in Patent Document 1 is known. The rolling tool described in Patent Document 1 includes a plurality of throw-away tips (hereinafter simply referred to as “tips”) each having a main cutting edge on the outer peripheral side of the tip end of the rolling tool. Some of the plurality of tips are tips with wiper blades (sweeper blades) that protrude toward the tip side of the rolling tool and have a wider width of the wiper blades compared to other tips. By having such a wiping blade, the flatness of the surface of the work material can be improved.

JP 2001-138122 A

  When the tip with the wiper blade described in Patent Document 1 is used, since a wide wiper blade is provided, chips generated at the portion of the wiper blade are larger than those of a normal tip. And in the rolling tool of patent document 1, the height from the lower surface of a main cutting edge and a wiping edge is the same. Therefore, the chips generated by the main cutting edge and the chips generated by the wiping edge are entangled, which may reduce the chip dischargeability.

  The present invention has been made in view of the above problems, and is a chip (cutting insert), a cutting tool, and a cut product that can discharge chips well even with a chip having a wide wiping blade. It is in providing the manufacturing method of.

  A cutting insert according to an aspect of the present invention is provided with a top surface, a bottom surface, a side surface connected to each of the top surface and the bottom surface, and a height from the bottom surface that is located at a line of intersection between the top surface and the side surface. The height of the wiping blade from the lower surface increases as the wiping blade approaches the wiping blade when viewed from the side, located adjacent to the wiping blade at the intersection of the wiping blade having a constant length and the upper surface and the side surface. The first main cutting edge that is inclined with respect to the wiping edge when viewed from above, and the first main cutting edge between the first main cutting edge and the intersection between the upper face and the side face. And is inclined to be higher from the lower surface as approaching the first main cutting edge when viewed from the side when viewed from the side, and inclined relative to the cleaning blade when viewed from the top And a second main cutting edge.

  And, when viewed from the side, the inclination angle of the second main cutting edge with respect to the lower surface is larger than the inclination angle of the first main cutting edge with respect to the lower surface, and when viewed from the upper surface, the wiping blade The inclination angle of the second main cutting edge with respect to the wiping edge is larger than the inclination angle of the first main cutting edge with respect to.

The cutting insert of the said aspect has a 1st main cutting edge with a relatively small inclination | tilt angle with respect to the wiping edge in the top view, and a 2nd main cutting edge with a relatively large inclination | tilt angle mentioned above. In this way, since the angle at which the chips generated by the main cutting blade intersect with the chips generated by the wiping blade is changed in stages, the possibility of tangling between the chips generated by the main cutting blade and the chips generated by the wiping blade can be reduced. . Further, when viewed from the side, the first main cutting edge and the second main cutting edge are inclined with respect to the wiping edge. Therefore, the chips generated by the first main cutting edge and the second main cutting edge can be easily flowed stepwise in a direction away from the wiping edge. Thereby, since the possibility that the chips generated by the main cutting edge and the chips generated by the wiping edge may be entangled can be further reduced, the chip dischargeability can be improved.

It is a perspective view which shows the cutting insert of the 1st Embodiment of this invention. It is a top view of the cutting insert shown in FIG. FIG. 3 is an enlarged plan view of a region B in the cutting insert shown in FIG. 2. It is a side view from the A1 direction in the cutting insert shown in FIG. It is a side view from the A2 direction in the cutting insert shown in FIG. It is a side view from the A3 direction in the cutting insert shown in FIG. It is a side view from the A4 direction in the cutting insert shown in FIG. It is sectional drawing of the X1-X1 cross section in the cutting insert shown in FIG. It is sectional drawing of the X2-X2 cross section in the cutting insert shown in FIG. It is the schematic which looked at the 1st modification of the cutting insert shown in FIG. It is a perspective view which shows the cutting tool of one Embodiment of this invention. It is a perspective view which shows 1 process of the manufacturing method of the cut workpiece of one Embodiment of this invention. It is a perspective view which shows 1 process of the manufacturing method of the cut workpiece of one Embodiment of this invention. It is a perspective view which shows 1 process of the manufacturing method of the cut workpiece of one Embodiment of this invention.

<Cutting insert>
Hereinafter, the cutting insert of one embodiment is explained in detail using a drawing. However, in the drawings referred to below, for convenience of explanation, among the constituent members of the embodiment, only the main members necessary for explaining the present invention are shown in a simplified manner. Therefore, the cutting insert of the present invention may include any component not shown in the drawings to which the present specification refers. Moreover, the dimension of the member in each figure does not represent the dimension of an actual structural member, the dimension ratio of each member, etc. faithfully.

  As shown in FIGS. 1-9, the cutting insert 1 of this embodiment is provided with the upper surface 3, the lower surface 5, and the side surface 7 connected to each of the upper surface 3 and the lower surface 5. As shown in FIG. The upper surface 3 and the lower surface 5 have substantially the same shape, and each has a substantially pentagonal shape. Each part of the side surface 7 connected to each side of the substantially pentagonal shape of the upper surface 3 has a planar shape.

  The cutting insert 1 includes a first main cutting edge 9, a second main cutting edge 11, and a first wiping edge 13 that are located at the intersection line between the upper surface 3 and the side surface 7. The first main cutting edge 9 is adjacent to the first wiping edge 13. The second main cutting edge 11 is adjacent to the first sweeping blade 13 with the first main cutting edge 9 interposed therebetween.

  Further, the cutting insert 1 includes a third main cutting edge 15, a fourth main cutting edge 17, and a second weeding edge 19 that are located at the intersection of the lower surface 5 and the side surface 7. The third main cutting edge 15 corresponds to the first main cutting edge 9, and the fourth main cutting edge 17 corresponds to the second main cutting edge 11. Therefore, the third main cutting edge 15 is adjacent to the second sweeping edge 19. The fourth main cutting edge 17 is adjacent to the second sweeping edge 19 with the third main cutting edge 15 interposed therebetween.

  The second main cutting edge 11 is located on one side constituting the pentagon forming the upper surface 3. The fourth main cutting edge 17 is positioned so as to overlap the second main cutting edge 11 when the cutting insert 1 is seen through in plan view. That is, the second main cutting edge 11 is formed at the upper end and the fourth main cutting edge 17 is formed at the lower end of one plane 7a of the plurality of planes constituting the side surface 7 of the cutting insert 1. ing.

  The first wiping blade 13 is located on the other side adjacent to the one side on which the second main cutting edge 11 is formed, among the pentagons forming the upper surface 3. That is, among the plurality of planes constituting the side surface 7, the first sweeping blade 13 is formed at the upper end of the plane 7 b adjacent to the plane 7 a formed with the second main cutting edge 11 at the upper end. Further, a second wiper blade 19 is formed at the lower end of the adjacent plane 7c with the plane 7b and the plane 7a having the first main cutting edge 9 formed at the upper end in between. For this reason, the second main cutting edge 11 and the fourth main cutting edge 17 overlap when viewed through the plane, while the first and third cleaning blades 13 and 19 overlap when viewed through the plane. It is located where it does not fit.

  By reversing the front and back of the cutting insert 1, the fourth main cutting edge 17 and the second wiping edge 19 are located at the position where the second main cutting edge 11 and the first wiping edge 13 were located. Therefore, the fourth main cutting edge 17 and the second wiping edge 19 can be used as the second main cutting edge 11 and the first wiping edge 13 by turning the cutting insert 1 upside down.

  The first main cutting edge 9, the second main cutting edge 11, the third main cutting edge 15, and the fourth main cutting edge 17 in the cutting insert 1 of the present embodiment are the main parts in cutting the work material 301. Used as a cutting blade. The first wiping blade 13 and the second wiping blade 19 are used as so-called wiper blades. As will be described later, the cutting tool 201 using the cutting insert 1 of the present embodiment includes the cutting insert 1 of the present embodiment including the wiper blade having a relatively wide width of the wiper blade and the wide wiper blade. A normal cutting insert (hereinafter, the cutting insert 1 of the present embodiment is also referred to as the first cutting insert 1 and a normal cutting insert not provided with a wiper blade is also referred to as the second cutting insert 101) is attached to the insert pocket 203. It is done. The first wiping blade 13 is preferably arranged in the holder 205 so as to be parallel to the upper surface of the work material 301 when used.

  The 1st main cutting edge 9 is located in the corner | angular part between the 1 side in which the 2nd main cutting edge 11 was formed, and the 1 side in which the 1st sweeping blade 13 was formed. That is, the first cleaning blade 13, the first main cutting edge 9, and the second main cutting edge 11 are arranged in this order.

  Chips formed by the first wiping blade 13 are likely to be larger than chips formed by the wiping blade of the second cutting insert 101. Therefore, in the case of a configuration that does not have the first main cutting edge 9, the chips formed by the second main cutting edge 11 and the chips formed by the first sweeping blade 13 are easily entangled. There is a possibility that the discharge performance of the wastewater will decrease.

  The cutting insert 1 according to the present embodiment includes the first main cutting edge 9 having a relatively large inclination angle with respect to the first sweeping edge 13 when viewed from the top as compared with the second main cutting edge 11. Between the two main cutting edges 11 and the first wiping edge 13. Therefore, the chips formed by the first main cutting edge 9 flow between the chips formed by the second main cutting edge 11 and the chips formed by the first sweeping blade 13.

That is, the angle at which the chips generated by the entire main cutting edge constituted by the first main cutting edge 9 and the second main cutting edge 11 intersect with the chips generated by the first wiping blade 13 can be changed stepwise. it can. As a result, it is possible to reduce the possibility that chips generated by the entire main cutting edge constituted by the first main cutting edge 9 and the second main cutting edge 11 and the chips generated by the first wiping edge 13 are entangled.

  Further, since the main cutting edge is composed of the first main cutting edge 9 and the second main cutting edge 11, the chips formed by the main cutting edge and the chips formed by the wiping edge are not easily divided. Because it becomes easy to connect, the possibility of chips getting tangled can be reduced.

  The fourth main cutting edge 17 is located on one side constituting the pentagon forming the upper surface 3. The fourth main cutting edge 17 is positioned so as to overlap the second main cutting edge 11 when the cutting insert 1 is seen through in plan view. That is, the second main cutting edge 11 is formed at the upper end and the fourth main cutting edge 17 is formed at the lower end of one plane 7a of the plurality of planes constituting the side surface 7 of the cutting insert 1. ing.

  The second sweeping blade 19 is located on the other side adjacent to the one side on which the fourth main cutting edge 17 is formed, among the pentagons forming the upper surface 3.

  As for the 2nd cutting insert 101 in the cutting tool 201 of this embodiment, the upper surface 3 and the lower surface 5 are respectively substantially regular pentagons. In order to allow the cutting insert 1 to be attached to the insert pocket 203 to which the second cutting insert 101 is attached, the second main surface among the five planes constituting the side surface 7 of the cutting insert 1 of the present embodiment. The remaining two planes 7d excluding the three planes 7a, 7b, 7c formed with the cutting edge 11, the first wiping edge 13, the fourth main cutting edge 17 or the second wiping edge 19 at the upper end or the lower end. , 7e are used as constraining side surfaces that are constrained in contact with the insert pocket 203 of the holder 205 to which the cutting insert 1 is attached. Therefore, the angle formed by the two planes 7d and 7e used as the constraining side surfaces is set to 108 °, which is the interior angle of a regular pentagon.

  Moreover, in order to make the position of the 2nd main cutting edge 11 in the cutting insert 1 correspond to the position of the main cutting edge in the 2nd cutting insert 101, as shown to FIG. When the inserts 101 are overlapped, the planes 7 a, 7 d, and 7 e are set so as to overlap with the side surfaces of the second cutting insert 101. In other words, as shown in FIG. 2, the cutting insert 1 of the present embodiment has a shape in which the intersecting angle between the plane 7b and the plane 7d and the intersecting angle between the plane 7c and the plane 7e are drawn outward from the regular pentagon. It has become. In FIG. 2, a portion corresponding to the outer periphery of the second cutting insert 101 is indicated by a one-dot chain line C.

  Therefore, the 1st wiping blade 13 formed in the upper end of the plane 7b and the 2nd wiping blade 19 formed in the lower end of the plane 7c can each be used as a wiper blade. In addition, since the angle at which the plane 7b and the plane 7d intersect and the angle at which the plane 7c and the plane 7e intersect are drawn out from the regular pentagon, the angle between the plane 7b and the plane 7d and the plane 7c and the plane The angles at which 7e intersect are smaller than 108 °, which is the interior angle of a regular pentagon. Accordingly, it is possible to prevent erroneous mounting that erroneously attaches to the insert pocket 203 with the flat surface 7b and the flat surface 7d as the restraining side surfaces, or the flat surface 7c and the flat surface 7e as the restraining side surfaces, respectively.

  In the cutting tool 201 using the cutting insert 1 of the present embodiment, the first sweeping blade 13 has a constant height from the lower surface 5, and the first main cutting blade 9 and the second main cutting blade. The height from the lower surface 5 is higher than 11. When viewed from the side, the first main cutting edge 9 is inclined so that the height from the lower surface 5 becomes higher as it approaches the first wiping edge 13. Further, the first main cutting edge 9 is inclined with respect to the first sweeping blade 13 when viewed from above. The height of the second main cutting edge 11 from the lower surface 5 is lower than that of the first main cutting edge 9, and the height from the lower surface 5 as approaching the first main cutting edge 9 when viewed from the side. Inclined so that the height is high. The second main cutting edge 11 is inclined with respect to the first wiping edge 13 when viewed from above.

  At this time, when viewed from the side, the inclination angle θ2 of the second main cutting edge 11 relative to the lower surface 5 is larger than the inclination angle θ1 of the first main cutting edge 9 relative to the lower surface 5. Further, when viewed from above, the inclination angle θ4 of the second main cutting edge 11 with respect to the first wiping blade 13 is larger than the inclination angle θ3 of the first main cutting edge 9 with respect to the first wiping edge 13.

  In this way, the inclination angle of the main cutting edge constituted by the first main cutting edge 9 and the second main cutting edge 11 with respect to the first wiping edge 13 which is a wiper blade is changed stepwise. Therefore, the angle at which the chips generated by the entire main cutting edge constituted by the first main cutting edge 9 and the second main cutting edge 11 intersect with the chips generated by the first wiping blade 13 can be changed stepwise. it can. As a result, it is possible to reduce the possibility that the chips generated by the first main cutting edge 9 and the second main cutting edge 11 and the chips generated by the first sweeping blade 13 are entangled.

  Moreover, since it can suppress that the angle which a wiper blade and the main cutting edge make changes rapidly, it can suppress that cutting resistance concentrates on the boundary of a wiper blade and a main cutting edge too much. Therefore, since it can suppress that a cutting blade lose | deletes, durability of the cutting insert 1 can be improved.

  While the height from the lower surface 5 of the first sweeping blade 13 is constant, the height from the lower surface 5 of the first main cutting blade 9 and the second main cutting blade 11 as the first sweeping blade 13 is approached. Is getting higher. That is, the first main cutting edge 9 and the second main cutting edge 11 are inclined with respect to the lower surface 5. Whereas the first wiping blade 13 is used to improve the flatness of the surface of the work material 301, the first main cutting edge 9 and the second main cutting edge 11 have more work material 301. Mainly used for cutting. Since the first main cutting edge 9 and the second main cutting edge 11 are inclined with respect to the work material 301, the cutting resistance applied to the first main cutting edge 9 can be reduced.

  Further, as the height from the lower surface 5 of the first main cutting edge 9 and the second main cutting edge 11 becomes higher as the first cleaning edge 13 is approached, the first main cutting edge 9 and the first main cutting edge 9 and the second main cutting edge 11 become higher. The chips cut by the second main cutting edge 11 are likely to flow away from the chips cut by the first wiping blade 13. Therefore, the possibility that the chips cut by the first main cutting edge 9 and the second main cutting edge 11 and the chips cut by the first sweeping blade 13 may be entangled.

  In addition, the intersection part of the upper surface 3 and the side surface 7 is not a strict line shape by two surfaces intersecting. When the intersecting line portion between the upper surface 3 and the side surface 7 is sharpened at an acute angle, the durability of the first main cutting edge 9, the second main cutting edge 11, and the first wiping edge 13 is lowered. Therefore, the portion where the upper surface 3 and the side surface 7 intersect may be subjected to a so-called honing process in which the curved surface is slightly formed.

  Examples of the material of the cutting insert 1 include cemented carbide or cermet. As the composition of the cemented carbide, for example, WC-Co produced by adding cobalt (Co) powder to tungsten carbide (WC) and sintering, and WC-Co obtained by adding titanium carbide (TiC) to WC-Co. There is WC-TiC-TaC-Co in which tantalum carbide (TaC) is added to TiC-Co or WC-TiC-Co. The cermet is a sintered composite material in which a metal is combined with a ceramic component, and specifically includes a titanium compound mainly composed of titanium carbide (TiC) or titanium nitride (TiN).

The surface of the cutting insert 1 may be coated with a film using a chemical vapor deposition (CVD) method or a physical vapor deposition (PVD) method. Examples of the composition of the coating include titanium carbide (TiC), titanium nitride (TiN), titanium carbonitride (TiCN), and alumina (Al ₂ O ₃ ).

  The maximum width when the top surface 3 and the bottom surface 5 of the cutting insert 1 of the present embodiment is viewed from above is 20 to 30 mm. The height from the lower surface 5 to the upper surface 3 is 3 to 7 mm. Here, the height from the lower surface 5 to the upper surface 3 means a width in a direction parallel to the through hole 21 between the upper end of the upper surface 3 and the lower end of the lower surface 5.

  The shapes of the upper surface 3 and the lower surface 5 are not limited to the above-described form. In the cutting insert 1 of the present embodiment, the shape of the upper surface 3 when viewed from above is substantially pentagonal, but this corresponds to the case where the second cutting insert 101 is one having an upper surface 3 that is a regular pentagon. Because. Therefore, according to the shape of the second cutting insert 101, for example, the shape of the upper surface 3 when viewed from above may be a polygonal shape such as a triangle, a quadrangle, a pentagon, a hexagon, or an octagon.

  For example, when the shape of the 2nd cutting insert 101 which does not have a wiper blade is a square pillar, the cutting insert 1 of a shape as shown in FIG. 10 can be used. In addition, in FIG. 10, the outer periphery of the 2nd cutting insert 101 which is a square pole is shown with the dashed-dotted line D. FIG. Moreover, even if it is a case where it has a curve site | part, it is not limited to circular arc shape. It may be a convex curve that is convex outward, such as a parabola or an elliptic curve.

  A through hole 21 is formed from the center of the upper surface 3 to the center of the lower surface 5. The through hole 21 is provided for inserting a screw 207 when the cutting insert 1 is fixed to the holder 205 of the cutting tool 201 with a screw. The direction of the central axis Y <b> 1 of the through hole 21, in other words, the through direction is orthogonal to the upper surface 3 and the lower surface 5.

  The upper surface 3 has a land surface 23, a first rake surface 25, a second rake surface 27, a breaker surface 29, and a main surface 31. The land surface 23 is located inside the first sweeping blade 13 so as to be continuous with the first sweeping blade 13, and the height from the lower surface 5 decreases toward the center of the upper surface 3. The first rake face 25 is located inside the land face 23 and is continuous with the land face 23. Further, the height of the first rake face 25 from the lower surface 5 decreases toward the center of the upper surface 3.

  The second rake face 27 is located inside the first main cutting edge 9 and the second main cutting edge 11, and is continuous with the first main cutting edge 9 and the second main cutting edge 11. Yes. Thus, the land surface 23 is not formed in the 1st main cutting edge 9 and the 2nd main cutting edge 11 in the cutting insert 1 of this embodiment. Similarly to the first rake face 25, the second rake face 27 becomes lower in height from the lower face 5 toward the center of the upper face 3.

  The breaker surface 29 is located inside the second rake surface 27. Further, the breaker surface 29 increases in height from the lower surface 5 toward the center of the upper surface 3. The second rake surface 27 and the breaker surface 29 constitute a breaker groove. That is, the breaker groove formed by the second rake face 27 and the breaker face 29 is positioned inside the first main cutting edge 9 and the second main cutting edge 11. The main surface 31 is located inside the first rake surface 25 and the breaker surface 29 and is parallel to the lower surface 5. Therefore, the main surface 31 is orthogonal to the central axis Y <b> 1 of the through hole 21. The through hole 21 is formed from the center of the upper surface 3 to the center of the lower surface 5. In this embodiment, the opening on the upper surface side of the through hole 21 is surrounded by the main surface 31.

The land surface 23 is provided to increase the strength of the first cleaning blade 13. The land surface 23 is set to have a smaller inclination angle than a first rake surface 25 described later. Here, the inclination angle indicates an inclination angle with respect to the upper surface 3 (main surface 31). If the purpose is to improve the cutting performance of the cutting blade, the upper surface 3 may not have the land surface 23. This is because the cutting edge has a sharp shape. The width of the land surface 23 indicated by the distance between the outer periphery of the upper surface 3 and the outer periphery of the first rake face 25 is appropriately set according to the cutting conditions, but is set in the range of 0.2 to 0.8 mm, for example.

  The first rake face 25 plays a role of scooping off chips cut by the first wiping blade 13. Therefore, the chips of the work material 301 flow so as to travel along the surface of the first rake face 25. The first rake face 25 is an inclined surface whose height decreases toward the center, that is, toward the inside, in order to scoop well when the chips of the work material 301 flow so as to travel along the surface. Yes.

  In addition, when it has the land surface 23 like the cutting insert 1 of this embodiment, and a chip has a certain thickness, the direction through which a chip flows is decided by the land surface 23, Chips may flow without passing through the surface of the first rake face 25. When the chips flow so as to travel along the surface of the first rake face 25, it is preferable that the first rake face 25 has a curved shape so that the chips can easily flow, but the surface of the first rake face 25 travels. When the chips flow without any problem, the shape of the first rake face 25 is not particularly required to be a curved shape.

  As shown in FIG. 8, in the cross section including the central axis Y <b> 1 of the through hole 21 and the land surface 23, the intersection of the virtual straight line along the land surface 23 and the central axis Y <b> 1 of the through hole 21 is from the opening of the through hole 21. Is also preferably located above. When chips flow without passing through the surface of the first rake face 25, the chips hit the main surface 31 at the inclination angle of the land surface 23, so that the main surface 31 may be damaged. However, since the land surface 23 has the above-described configuration, the possibility of chips hitting the main surface 31 can be reduced. As a result, the durability of the cutting insert 1 can be improved.

  The second rake face 27 plays a role of scooping up chips cut by the first main cutting edge 9 and the second main cutting edge 11. Therefore, the chips of the work material 301 flow so as to travel along the surface of the second rake face 27. The second rake surface 27 is an inclined surface whose height decreases toward the center in order to scoop well when the chips of the work material 301 flow so as to travel along the surface.

  Further, the upper surface 3 in the present embodiment does not have the land surface 23 in order to improve the machinability of the first main cutting edge 9 and the second main cutting edge 11. That is, the land surface 23 is not formed in the region along the first main cutting edge 9 where high machinability is required, and stable cutting is required to improve the flatness of the surface of the work material 301. A land surface 23 is formed in a region along the wiping blade 13.

  As shown in FIGS. 8 and 9, the inclination angle indicated by the angle formed between the lower surface 5 and the first rake face 25 and the second rake face 27 may be set in the range of 10 ° to 50 °, for example. . Since the first rake face 25 and the second rake face 27 only need to have a height that decreases toward the center, as shown in FIGS. It may be constituted by a plurality of regions, or may have a concave curve shape.

  The breaker surface 29 is located inside the second rake surface 27. The breaker surface 29 serves to curl chips that have flowed over the second rake surface 27. When the chips are curled, it is possible to exhibit excellent chip discharging performance. Therefore, the height of the region close to the main surface 31 on the breaker surface 29 increases as the distance from the outer periphery increases. Specifically, the breaker surface 29 is an inclined surface whose height on the center side is higher than that on the outer peripheral side of the upper surface 3. The inclination angle indicated by the angle formed between the lower surface 5 and the breaker surface 29 in the cross section perpendicular to the breaker surface 29 may be set in the range of 5 ° to 45 °, for example.

  In the first sweeping blade 13 in the present embodiment, the distance W to the boundary E1 between the first rake face 25 and the principal face 31 increases as the distance from the first principal cutting edge 9 approaches. In other words, the boundary E1 is inclined with respect to the first wetting blade 13 so that the distance between the above-mentioned boundary E1 and the first weaving blade 13 decreases as the distance from the first main cutting edge 9 increases.

  As shown in FIG. 2, when viewed from above, the boundary E1 between the first rake face 25 and the main surface 31 is linear, and the boundary E2 between the breaker surface 29 and the main surface 31 is inward. The curve shape is concave.

  The cutting insert 1 of the present embodiment has a lower surface in addition to the first main cutting edge 9, the second main cutting edge 11, and the first sweeping blade 13 formed at the intersection of the upper surface 3 and the side surface 7. The third main cutting edge 15, the fourth main cutting edge 17, and the second wiping edge 19 formed at the intersecting line between 5 and the side surface 7 are provided. When the cutting insert 1 is mounted on the holder 205, the third main cutting edge 15, the fourth main cutting edge 17, and the second weeding edge 19 are mounted on the first main cutting edge 9 by reversing the front and back. The second main cutting edge 11 and the first cleaning blade 13 can function in the same manner. Therefore, in the cutting insert 1 of this embodiment, the lower surface 5 has the same configuration as the upper surface 3. Specifically, the lower surface 5 has a land surface 23, a first rake surface 25, a second rake surface 27, a breaker surface 29, and a main surface 31, similarly to the upper surface 3.

<Cutting tools>
Next, a cutting tool 201 according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 11, the cutting tool 201 of the present embodiment has a rotation center axis Y <b> 2, a holder 205 having a plurality of insert pockets 203 on the outer peripheral surface on the distal end side, and at least one of the insert pockets 203. The cutting insert 1 to be mounted and the second cutting insert 101 mounted to the insert pocket 203 to which the cutting insert 1 is not mounted are provided.

  The holder 205 has a substantially rotating body shape around the rotation center axis Y2. A plurality of insert pockets 203 are provided at equal intervals on the outer peripheral surface on the tip side of the holder 205. The insert pocket 203 is a part to which the cutting insert 1 or the second cutting insert 101 is attached, and is open to the outer peripheral surface and the front end surface of the holder 205. Specifically, the insert pocket 203 has a seating surface that opposes the rotation direction and two restraint side surfaces that are positioned in a direction in which the seating surface intersects.

  Then, the cutting insert 1 or the second cutting insert 101 is mounted in the plurality of insert pockets 203 provided in the holder 205. The cutting insert 1 is mounted on the holder 205 so that the first main cutting edge 9 protrudes from the outer periphery of the tip of the holder 205 and the first wiping blade 13 protrudes from the tip of the holder 205. The second cutting insert 101 is mounted on the holder 205 so that cutting edges formed on the outer periphery of the upper surface 3 protrude from the outer periphery and the tip of the holder 205, respectively.

  At this time, the cutting insert is made so that the first main cutting edge 9 and the second main cutting edge 11 of the cutting insert 1 and the cutting amount formed on the outer periphery of the second cutting insert 101 are the same. The first and second cutting inserts 101 are attached to the holder 205. Further, the cutting insert 1 and the second cutting insert 101 are arranged such that the first sweeping blade 13 of the cutting insert 1 protrudes to the tip side of the holder 205 with respect to the cutting edge formed on the outer periphery of the second cutting insert 101. Is attached to the holder 205.

  In the cutting tool 201 of the present embodiment, not only the second cutting insert 101 but also the cutting insert 1 having a wiper blade having a relatively wide width of the wiper blade is mounted. The flatness of the surface with which the first wiping blade 13 contacts can be improved.

  In the present embodiment, the cutting insert 1 and the second cutting insert 101 are mounted in the insert pocket 203 by screws 207, respectively. That is, a screw 207 is inserted into the through hole 21 of the cutting insert 1 and the second cutting insert 101, and the tip of the screw 207 is inserted into a screw hole (not shown) formed in the insert pocket 203 so that the screw portions are connected to each other. The cutting insert 1 and the second cutting insert 101 are attached to the holder 205 by being screwed together.

  In the present embodiment, the cutting insert 1 and the second cutting insert 101 have a positive axial rake angle and a negative radial rake angle at the cutting edge protruding outward from the outer peripheral surface with respect to the holder 205. It is so fitted.

  As the holder 205, steel, cast iron, or the like can be used. In particular, it is preferable to use steel having high toughness among these members.

<Manufacturing method of cut product>
Next, the manufacturing method of the cut workpiece of one Embodiment of this invention is demonstrated using drawing.

The cut workpiece is produced by cutting a workpiece. The cutting method in the present embodiment includes the following steps. That is,
(1) a step of rotating a cutting tool 201 typified by the above embodiment;
(2) contacting the work material 301 with the first main cutting edge 9, the second main cutting edge 11 and the first wiping edge 13 in the rotating cutting tool 201;
(3) a step of separating the cutting tool 201 from the work material 301;
It has.

  More specifically, first, the cutting tool 201 is rotated relatively close to the work material 301. Next, as shown in FIGS. 12 and 13, the first main cutting edge 9, the second main cutting edge 11, and the first wiping edge 13 of the cutting tool 201 are brought into contact with the work material 301 to cut the workpiece. The material 301 is cut. Then, as shown in FIG. 14, the cutting tool 201 is relatively moved away from the work material 301.

  In the present embodiment, the work material 301 is fixed and the cutting tool 201 is brought closer. 12 and 13, the work material 301 is fixed and the cutting tool 201 is rotated. In FIG. 14, the work material 301 is fixed and the cutting tool 201 is moved away. In the cutting in the manufacturing method of the present embodiment, the work material 301 is fixed and the cutting tool 201 is moved in each step, but it is naturally not limited to such a form.

  For example, the work material 301 may be brought closer to the cutting tool 201 in the step (1). Similarly, the work material 301 may be moved away from the cutting tool 201 in the step (3). When continuing the cutting process, the state where the cutting tool 201 is rotated is maintained, and the first main cutting edge 9, the second main cutting edge 11 of the cutting insert 1, What is necessary is just to repeat the process which makes the 1st wiping blade 13 contact. When the first main cutting edge 9, the second main cutting edge 11, and the first wiping edge 13 used are worn, the cutting insert 1 is inverted between the upper surface 3 and the lower surface 5 of the through hole 21. Then, the unused third main cutting edge 15, fourth main cutting edge 17, and second wiping edge 19 may be used.

  Typical examples of the material of the work material 301 include carbon steel, alloy steel, stainless steel, cast iron, non-ferrous metal, and the like.

1 ... Cutting insert (first cutting insert)
DESCRIPTION OF SYMBOLS 3 ... Upper surface 5 ... Lower surface 7 ... Side surface 9 ... 1st main cutting blade 11 ... 2nd main cutting blade 13 ... 1st wiping blade 15 ... 3rd Main cutting edge 17 ... fourth main cutting edge 19 ... second wiping blade 21 ... through hole 23 ... land surface 25 ... first rake surface 27 ... second Rake face 29 ... breaker surface 31 ... main surface 101 ... second cutting insert 201 ... cutting tool 203 ... insert pocket 205 ... holder 207 ... screw 301 ... Work material

Claims (5)

The top surface;
The bottom surface,
Side surfaces connected to each of the upper surface and the lower surface;
A wiping blade located at the intersection line between the upper surface and the side surface and having a constant height from the lower surface, and located adjacent to the wiping blade located at an intersection line between the upper surface and the side surface. A first main cutting edge that is inclined so as to increase in height from the lower surface as it approaches the wiping blade when viewed, and inclined with respect to the wiping blade when viewed from the upper surface;
The lower surface is located at the intersection of the upper surface and the side surface, is adjacent to the wiping blade with the first main cutting blade in between, and as viewed from the side, approaches the first main cutting blade. And a second main cutting edge that is inclined with respect to the wiping edge when viewed from above, with an inclination to increase the height from
When viewed from the side, the inclination angle of the second main cutting edge with respect to the lower surface is larger than the inclination angle of the first main cutting edge with respect to the lower surface, and when viewed from the upper surface, A cutting insert characterized in that an inclination angle of the second main cutting edge with respect to the wiping edge is larger than an inclination angle of the first main cutting edge.   The upper surface is located on the inside of the wiper blade so as to be continuous with the wiper blade, and has a land surface that decreases in height from the lower surface toward the center of the upper surface, and is located on the inner side of the land surface. A rake face whose height from the lower face decreases toward the center of the upper face, a breaker groove located inside the first main cutting edge and the second main cutting edge, the rake face and the breaker The cutting insert according to claim 1, further comprising a main surface that is located inside the groove and is parallel to the lower surface. Further comprising a through-hole penetrating from the upper surface to the lower surface;
In a cross section including the central axis of the through hole and the land surface, the intersection of the virtual straight line along the land surface and the central axis of the through hole is located above the opening of the through hole. The cutting insert according to claim 2. A holder having a plurality of insert pockets on the tip side;
Is attached to at least one of the plurality of insert pockets so that the blade, the first main cutting edge and the second main cutting edge protrude from the front end of the holder. A cutting tool comprising the cutting insert according to any one of claims 1 to 3. Rotating the cutting tool according to claim 4;
Contacting the cutting blade, the first main cutting edge and the second main cutting edge of the rotating cutting tool with a work material;
The manufacturing method of the cut workpiece provided with the process of separating the said cutting tool from the said workpiece.

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