JP5952073B2 - Cutting insert, cutting tool and method of manufacturing workpiece - Google Patents

Description

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

  Conventionally, the cutting insert of patent document 1 is known as a cutting tool used for the cutting of a workpiece. Specifically, the cutting insert described in Patent Literature 1 is used for face milling or turning processing such as an end mill. In the cutting insert of patent document 1, the cutting blade formed in the intersection part of an upper surface and a side surface is divided | segmented by the groove part, and becomes a division | segmentation cutting blade. Therefore, the cutting resistance at the time of cutting of a workpiece is reduced.

JP-A-9-57519

  When the machining is performed using the cutting insert described in Patent Document 1, the workpiece is cut by the divided cutting blade, and thus a plurality of chips having a small width are generated. The cutting resistance is reduced because the width of the chips is small, but the chips are easily entangled because a plurality of chips are generated. In particular, the smaller the chip width, the more unstable the flow direction of the chips, so that the chips become more easily entangled. Therefore, it may be difficult to discharge chips well.

  This invention is made | formed in view of said subject, and it is providing the manufacturing method of a cutting insert, a cutting tool, and a cut workpiece provided with the outstanding chip | tip discharge property, reducing cutting resistance.

Cutting insert according to an embodiment of the present invention, so as to surround a lower surface, the breaker surface height becomes lower toward the outer peripheral, the main surface portion surrounded by the centrally located breaker surface, and the breaker face An upper surface having a rake face that increases in height as it approaches the outer periphery, a side surface connected to each of the lower surface and the upper surface, and a cutting blade located at the intersection of the side of the upper surface and the side surface And a corner cutting edge located at the intersection of the corner of the upper surface and the side surface. In addition, a plurality of groove portions having one end reaching the upper surface are formed on the side surface, and the cutting blade is composed of a plurality of divided cutting blades divided by the plurality of groove portions. The cutting insert of the above aspect has a plurality of protrusions extending from the breaker surface to the rake surface on the top surface, and the plurality of protrusions include a first protrusion and a second protrusion adjacent to each other. And the first protrusion and the second protrusion extend toward one of the plurality of divided cutting blades, and an interval between the first protrusion and the second protrusion is the upper surface. The main surface portion has a protruding portion that protrudes toward the groove portion closest to the corner of the upper surface among the plurality of groove portions, and the protruding portion is It is characterized by being higher than the plurality of protrusions .

  The cutting tool based on 1 aspect of this invention has comprised the cutting insert of the said aspect, and the holder with which the said cutting insert was mounted | worn.

  The manufacturing method of the cut workpiece based on 1 aspect of this invention WHEREIN: The process of rotating the cutting tool of the said aspect, The process of contacting the said cutting blade in the said cutting tool in rotation with a workpiece, The said cutting tool And a step of separating the workpiece from the work material.

  Since the cutting insert of the said aspect has the some processus | protrusion extended from the breaker surface to the rake face on the upper surface, it can flow a chip along a some processus | protrusion. Therefore, the possibility that the chips are entangled with each other is reduced, and the chips can be discharged well.

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. It is the enlarged plan view which expanded the area | region X of the cutting insert shown in FIG. It is a side view of the cutting insert shown in FIG. It is sectional drawing of the AA cross section in the cutting insert shown in FIG. It is the expanded sectional view which expanded a part of BB cross section in the cutting insert shown in FIG. It is a perspective view which shows the tool holder concerning one Embodiment of this invention. It is process drawing of the cutting method concerning one Embodiment of this invention. It is process drawing of the cutting method concerning one Embodiment of this invention. It is process drawing of the cutting method concerning 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.

  FIG. 5 is a cross-sectional view taken along the line AA in the cutting insert shown in FIG. 2 and includes a part of a plurality of protrusions. FIG. 6 is an enlarged cross-sectional view of a section BB in the cutting insert shown in FIG.

  As shown in FIGS. 1-6, the cutting insert 1 of this embodiment is provided with the upper surface 3 and the lower surface 5 whose shape at the time of planar view is square shape. Further, between the upper surface 3 and the lower surface 5, four side surfaces 7 connected to these surfaces are provided. Specifically, since the upper surface 3 and the lower surface 5 are each rectangular, four flat side surfaces 7 are located between the upper surface 3 and the lower surface 5. In the cutting insert 1 of this embodiment, since the lower surface 5 is smaller than the upper surface 3, the four side surfaces 7 have shapes inclined with respect to the upper surface 3 and the lower surface 5, respectively. When the angle formed by the upper surface 3 and the side surface 7 is an inner angle and the value obtained by subtracting the inner angle from 90 ° is an inclination angle, the inclination angle in the cutting insert 1 of the present embodiment is set to 11 °.

  As shown in FIG. 2, the cutting insert 1 of the present embodiment has a quadrangular shape on the upper surface 3 when viewed in plan, but is not limited to such a form. For example, the shape of the upper surface 3 in a plan view may be a polygonal shape such as a triangle, pentagon, hexagon, or octagon. Further, that the shape when viewed in plan is a quadrangle does not strictly require a quadrangle, and the main part of the outer periphery excluding the groove 21 is composed of four sides. The part may have a curved shape. Moreover, you may use for the cutting process the corner | angular part of this curve shape as the corner cutting edge 19. FIG.

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 lower surface 5 of the cutting insert 1 of the present embodiment has a seating surface (not shown) that comes into contact with the insert pocket 105 of the holder 103 when mounted on the holder 103. In order to stably mount the cutting insert 1 on the holder 103, the seating surface is a flat surface. Hereinafter, the “height from the lower surface 5” means the height from a flat surface such as the seating surface.

  The top surface 3 of the cutting insert 1 of the present embodiment includes a flat main surface portion 9, a breaker surface 11 positioned so as to surround the main surface portion 9, a rake surface 13 positioned so as to surround the breaker surface 11, and a rake. And a land surface 15 positioned so as to surround the surface 13.

  The main surface portion 9 is located at the center of the upper surface 3. A through hole 17 is formed from the center of the main surface portion 9, in other words, from the center of the upper surface 3 to the center of the lower surface 5. The through hole 17 is provided for inserting a bolt 107 when the cutting insert 1 is screwed and fixed to the holder 103 of the cutting tool 101. In addition, as a method of fixing the cutting insert 1 to the holder 103, a clamp structure may be employed instead of the above-described method using screw fixing.

  The land surface 15 is located on the outer peripheral edge of the upper surface 3 and surrounds the rake surface 13. The land surface 15 is formed so as to be substantially parallel to the lower surface 5. Note that “substantially parallel” does not mean strictly parallel, but may mean a deviation of about ± 5 °.

  A cutting edge 19 is formed at the intersection of the land surface 15 and the side surface 7. The land surface 15 is provided to increase the strength of the cutting edge 19. When the land surface 15 is not provided, the cutting edge 19 is formed at the intersection of the rake surface 13 and the side surface 7. As will be described later, the rake face 13 located on the inner side of the land face 15 increases in height as it approaches the outer periphery. Therefore, the internal angle formed by the rake face 13 and the side face 7 is small. However, by having the land surface 15, the internal angle formed between the land surface 15 and the side surface 7 is increased, so that the strength of the cutting edge 19 can be increased.

  In addition, if it aims at improving the machinability of the cutting edge 19, it is good also as a structure by which the cutting edge 19 was formed in the intersection line part of the rake face 13 and the side surface 7. FIG. This is because the cutting edge 19 has a sharp shape. The width of the land surface 15 indicated by the distance between the outer periphery of the upper surface 3 and the outer periphery of the rake face 13 is appropriately set depending on the cutting conditions, but may be set in the range of, for example, 0.1 to 0.2 mm.

  The rake face 13 is located inside the land face 15 so as to surround the breaker face 11. The rake face 13 is a part having a role of smoothly discharging chips to the outside by contacting the chips cut by the cutting blade 19 at the time of cutting and changing the moving direction of the chips. The rake face 13 in the present embodiment is composed of a plurality of linear portions when viewed in cross section, but is not limited thereto. For example, there is no problem even if the rake face 13 has a curved shape.

  The rake face 13 plays a role of scooping off chips cut by the cutting edge 19. Therefore, the chips of the work material 201 flow so as to travel along the surface of the rake face 13. The rake face 13 increases in height as it approaches the outer periphery in order to scoop off chips well. Specifically, the rake face 13 is an inclined surface whose height on the outer peripheral side is higher than the center side on the upper surface 3. The inclination angle indicated by the angle formed between the lower surface 5 and the rake face 13 in the cross section perpendicular to the rake face 13 may be set in the range of, for example, 10 ° to 30 °.

  The breaker surface 11 is located so as to surround the main surface portion 9. The breaker surface 11 serves to curl the chips flowing on the rake surface 13 in a spiral shape. The chip is deformed into a spiral shape, thereby making it possible to exhibit excellent chip discharging performance. Therefore, the height of the breaker surface 11 increases as the distance from the outer periphery increases. In other words, the height of the breaker surface 11 increases as it approaches the main surface portion 9. Specifically, the breaker surface 11 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 11 in the cross section perpendicular to the breaker surface 11 may be set in the range of 20 ° to 45 °, for example. In particular, the inclination angle of the breaker surface 11 is preferably larger than the inclination angle of the rake face 13. This is because the chips flowing along the surface of the rake face 13 can be curled in a favorable spiral shape on the breaker surface 11.

  The substantially rectangular upper surface 3 in the cutting insert 1 of the present embodiment has one side set to about 6 to 25 mm, for example. Moreover, the substantially rectangular lower surface 5 in the cutting insert 1 is set to have a side of, for example, about 5 to 20 mm. Furthermore, the thickness from the upper surface 3 to the lower surface 5 is set to about 3 to 10 mm, for example. At this time, the thickness means the width in the vertical direction from the uppermost part of the upper surface 3 to the lowermost part of the lower surface 5 when the cutting insert 1 is viewed from the side.

  The cutting insert 1 of the present embodiment has a shape having the cutting edge 19 only at the intersecting portion between the upper surface 3 and the side surface 7, but has a shape having the cutting edge 19 also at the intersecting portion between the lower surface 5 and the side surface 7. There may be. In such a case, the cutting insert 1 can be used upside down.

  At least one of the four side surfaces 7 is formed with a groove portion 21 having one end reaching the upper surface 3. Specifically, the cutting insert 1 of the present embodiment has a plurality of grooves 21 each having one end reaching the upper surface 3 and the other end reaching the lower surface 5 on each of the four side surfaces 7. At this time, the groove portion 21 has a bottom surface formed from the upper surface 3 toward the lower surface 5 and a pair of both side surfaces formed from the upper surface 3 toward the lower surface 5 so as to sandwich the bottom surface therebetween. . In addition, although a part of groove part 21 in the cutting insert 1 of this embodiment has the other end reaching the lower surface 5, it is not particularly limited to this configuration.

  In FIG. 3, the width | variety of the direction parallel to the side surface 7 of the cutting insert 1 in the groove part 21 is set to about 1-2 mm. Moreover, the width | variety of the direction perpendicular | vertical to the side surface 7 of the cutting insert 1 in the groove part 21, in other words, the depth of the groove part 21 is set to about 0.5-1 mm.

  A plurality of divided cutting edges 23 are formed at the intersection of the upper surface 3 and the side surface 7. In the cutting insert 1 of the present embodiment, since the plurality of groove portions 21 are formed on the side surface 7, each of the side surfaces 7 divided by the groove portions 21 and the upper surface 3 is divided at each intersection. A blade 23 is formed. In other words, the cutting edge 19 formed at the intersection of the upper surface 3 and the side surface 7 is divided into a plurality of divided cutting edges 23 by the groove 21. The width of each divided cutting edge 23 is set to about 2 to 4 mm, for example.

At this time, the intersecting line portion between the upper surface 3 and the side surface 7 is not a strict line shape due to the intersection of the two surfaces. If the intersecting line portion between the upper surface 3 and the side surface 7 is sharpened at an acute angle, the durability of the cutting blade 19 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.

  The boundary between the bottom surface and both side surfaces of the groove portion 21 and the boundary between both side surfaces of the groove portion 21 and the side surface 7 of the cutting insert 1 are preferably curved. The load applied to the divided cutting edge 23 during cutting is different from the load applied to the groove 21. Therefore, due to this difference in cutting load, relatively large stress is easily applied to the boundary between the bottom surface and both side surfaces of the groove portion 21 and the boundary between both side surfaces of the groove portion 21 and the side surface 7 of the cutting insert 1. It is.

  As shown in FIG. 4, when the cutting insert 1 is viewed from the side, the height of the upper end at the center of the side surface 7 is lower than the height of the upper end at the side end of the side surface 7. In other words, the upper end of the side surface 7 in the portion excluding the groove portion 21 has a concave shape. Therefore, in the cutting insert 1 of this embodiment, the height from the lower surface 5 of the division | segmentation cutting blade 23 located in the center among the some division | segmentation cutting blades 23 is the lower surface 5 of the division | segmentation cutting blade 23 located in both ends. Lower than the height from.

  When the split cutting edge 23 is formed in this way, a positive axial rake (axial rake angle) can be imparted from the corner to the center of the cutting edge, so that the cutting resistance can be reduced. On the other hand, since the chips easily gather in the center, the chips are easily entangled. However, since the cutting insert 1 of the present embodiment has a plurality of protrusions 25 described in detail below, it is possible to easily collect the chips while suppressing the entanglement of the chips.

  Further, when the cutting insert 1 is viewed in plan, a line connecting a plurality of divided cutting edges 23 in a portion excluding the groove portion 21 is concave toward the outside. That is, among the plurality of divided cutting blades 23, the divided cutting blade 23 located at the center is located inside the divided cutting blades 23 located at both ends. More specifically, the divided cutting blade 23 located at the center is located on the inner side than the straight line connecting the divided cutting blades 23 located at both ends of the plurality of divided cutting blades 23.

  The cutting insert 1 of the present embodiment has a plurality of protrusions 25 on the upper surface 3 extending linearly from the breaker surface 11 to the rake surface 13. As already shown, the chips of the work material 201 flow along the surface of the rake face 13. At this time, since the width of the chips generated by the divided cutting blades 23 is small, the flow direction of the chips is likely to be unstable, and the chips are easily entangled because a plurality of chips are generated at the same time.

  However, since each of the plurality of protrusions 25 extends from the breaker surface 11 to the rake surface 13, it is easy to stabilize the direction in which the chips flow. Therefore, possibility that chips may get entangled can be reduced, and chips can be discharged stably.

  Here, the protrusion 25 extends from the breaker surface 11 to the rake face 13 when one end of the protrusion 25 is located on the breaker face 11 and the other end of the protrusion 25 is a rake face. 13 is located on the top. Further, each of the plurality of protrusions 25 extends linearly. The fact that the protrusion 25 extends linearly is not limited to the fact that the ridge line of the protrusion 25 is positioned on a straight line, as shown in FIG. 3, but one end and the other end of the protrusion 25. This means that it is sufficient that the protrusion 25 exists on a straight line connecting the portions.

  The cutting insert 1 of the present embodiment has a plurality of protrusions 25 extending from the breaker surface 11 to the rake face 13, and at least some of the plurality of protrusions 25 extend toward the plurality of groove portions 21. . Since the cutting edge 19 is divided by the groove 21, chips are also divided on the basis of the groove 21. When the protrusion 25 extends toward the groove portion 21, the protrusion 25 is positioned between the divided chips. Therefore, possibility that chips will get entangled can be made smaller.

  That the protrusion 25 extends toward the plurality of groove portions 21 means that the groove portion 21 is positioned on an extension line of the linear protrusion 25. Therefore, the protrusion 25 does not necessarily have to extend to the groove portion 21. Moreover, although it is preferable that the protrusion 25 is extended toward each groove part 21, it is not restricted to this. As shown in FIGS. 2 and 3, if the protrusion 25 extends toward at least one of the plurality of groove portions 21, the possibility that chips are entangled can be reduced.

  Furthermore, in the cutting insert 1 of the present embodiment, at least a part of the plurality of protrusions 25 extends toward the plurality of divided cutting blades 23. Since the chips flow on the protrusions 25, the direction in which the chips flow can be stably controlled by the protrusions 25. As a result, it is possible to further reduce the possibility of adjacent chips getting tangled when flowing on the rake face 13.

  Further, when the chips flow on the protrusions 25, the chips are deformed along the shape of the protrusions 25, so that the width of the chips can be reduced. Therefore, since the space | interval of chips can be expanded, the possibility that chips will intertwine can be further reduced. In particular, this configuration is more effective because the chips are easily deformed at the time of low cutting or when the work material 201 is a soft member.

  Further, the cutting insert 1 of the present embodiment has a configuration in which a plurality of protrusions 25 extend toward one divided cutting edge 23. Thus, when the some protrusion 25 is extended, the direction through which a chip flows can be controlled more stably. Specifically, since the chips are deformed in a wave shape along the shape of the plurality of protrusions 25, the direction in which the chips flow can be controlled more stably, and the interval between the chips can be further increased.

  In the cutting insert 1 of the present embodiment, at least one of the plurality of protrusions 25 has a constant width from the breaker surface 11 to the rake surface 13. Specifically, when one of the plurality of protrusions 25 is viewed in plan as shown in FIG. 3, the width in the direction orthogonal to the direction in which the protrusions 25 extend is constant from the breaker surface 11 side to the rake surface 13 side. . When the protrusion 25 is formed in this way, the direction in which the chips flow can be stably controlled by the protrusion 25.

  Note that the constant width does not strictly require that the entire protrusion 25 is constant. That is, it is not necessary that the width including the both ends of the protrusion 25 is constant. For example, as shown in FIG. 3, the outer periphery of the projection 25 in the cutting insert 1 of the present embodiment when viewed in plan is curved at both ends, and the portion sandwiched between these curves is linear. It has become. The width of the protrusion 25 is constant in the portion where the outer periphery is linear.

  In the cutting insert 1 of the present embodiment, at least one of the plurality of protrusions 25 has a constant height from the breaker surface 11 and the rake surface 13. That is, the protrusions 25 are formed so as to match the irregular shapes of the surfaces of the breaker surface 11 and the rake surface 13. The chips flow along the surfaces of the rake face 13 and the breaker face 11. Therefore, when the height of the protrusion 25 from the breaker surface 11 and the rake face 13 is constant, it is difficult to inhibit the flow of the chip, and the possibility of the chip being clogged by the protrusion 25 can be reduced. The protrusions 25 can be controlled well.

Moreover, in the cutting insert 1 of this embodiment, it has the 1st processus | protrusion 25A and the 2nd processus | protrusion 25B which are mutually adjacent as the some processus | protrusion 25. FIG. Further, the first protrusion 25A
And the second protrusion 25 </ b> B increase as they approach the outer periphery of the upper surface 3. In other words, the interval between the protrusions 25 adjacent to each other becomes smaller toward the center of the upper surface 3. In the case where the first protrusion 25A and the second protrusion 25B are provided, it is easy to collect the chips while suppressing the possibility that the chips separated by the groove 21 are entangled with each other.

  In particular, in the cutting insert 1 of the present embodiment, the plurality of protrusions 25 extend radially from the breaker surface 11 toward the rake face 13. By forming the plurality of protrusions 25 in this way, it is possible to suppress the possibility that the chips separated by the groove 21 are entangled with each other. Chips whose direction of flow is controlled by a plurality of radially extending protrusions are curled in a spiral shape by hitting the breaker surface 11.

  As already shown, in the cutting insert 1 of the present embodiment, among the plurality of divided cutting blades 23, the divided cutting blades whose height from the lower surface 5 of the divided cutting blade 23 located at the center is located at both ends. 23 is lower than the lower surface 5 of the lower surface 5, and when viewed in plan, the angle of inclination of the divided cutting blade 23 positioned at both ends with respect to the lower surface 5 is larger than the angle of inclination of the divided cutting blade 23 positioned at the center with respect to the lower surface 5 .

  Chips generated from the cutting edge 19 flow in the normal direction of the cutting edge 19. When the inclination angle with respect to the lower surface 5 of the divided cutting blades 23 located at both ends is larger than the inclination angle with respect to the lower surface 5 of the divided cutting blade 23 located in the center, the normal direction of each of the divided cutting blades 23 is different. There is a possibility that the flow directions of the chips generated from the respective divided cutting edges 23 intersect each other and the chips are easily entangled with each other.

  Even when the divided cutting blade 23 has such a configuration, the flow direction can be stably controlled without excessively hindering the flow of chips by the protrusion 25. Moreover, chips can be collected while reducing the possibility of tangling of chips.

  That is, since the plurality of protrusions 25 extend radially from the breaker surface 11 toward the rake face 13, chips can be easily collected at the center of the upper surface while preventing the chips from being entangled with each other. As a result, good chip dischargeability can be achieved.

  Moreover, in the cutting insert 1 of this embodiment, the height of the edge part by the side of the breaker surface 11 of the some protrusion 25 is lower than the height of the edge of the breaker surface 11 on the extension line | wire of the some protrusion 25. . In addition, the height of the end portion on the side of the rake face 13 is lower than the height of the end of the rake face 13 on the extension line of the plurality of protrusions 25.

  When the height of the end of the projection 25 on the side of the breaker surface 11 is lower than the height of the end of the breaker surface 11 on the extension line of the plurality of projections 25, chips flowing on the projection 25 are broken by the breaker surface. The possibility of overcoming 11 and flowing in an unexpected direction can be suppressed, and chips can be curled stably on the breaker surface 11. Further, when the height of the end portion on the side of the rake face 13 is lower than the height of the end of the rake face 13 on the extension line of the plurality of protrusions 25, cutting by the divided cutting edge 23 is inhibited by the protrusions 25. Since the possibility of being cut is small, the workpiece can be stably cut.

  Moreover, in the cutting insert 1 of this embodiment, the some protrusion 25 has the same width | variety, respectively. When the widths of the plurality of protrusions 25 are the same, variation in chip control by the protrusions 25 is reduced, so that the flow of chips can be controlled more stably.

  Moreover, in the cutting insert 1 of this embodiment, the main surface portion 9 has a protruding portion 9A that protrudes toward the groove portion 21 that is present at the position closest to the corner portion of the upper surface 3 among the plurality of groove portions 21. ing. Here, protruding toward the groove portion 21 means that the groove portion 21 is located on an extension line in the protruding direction of the protruding portion 9A, as indicated by a one-dot chain line Y in FIG.

  As already shown, in the cutting insert 1 of the present embodiment, the upper end of the side surface 7 in the portion excluding the groove portion 21 has a concave shape, so that chips are easily collected in the center. In particular, the split cutting edge 23 positioned between the corner portion and the groove portion 21 has a relatively large inclination angle with respect to the lower surface 5 when viewed from the side. Therefore, the chips generated by the divided cutting blades 23 are likely to travel in a direction greatly inclined with respect to the divided cutting blades 23 when viewed in plan. In such a case, chips generated by the divided cutting blades 23 (hereinafter referred to as a first chip for convenience) and chips generated by the divided cutting blades 23 adjacent to the divided cutting blade 23 (hereinafter referred to as a first for convenience). 2).

  However, when the projecting portion 9A is provided, the projecting portion 9A is positioned between the direction in which the first chip proceeds and the direction in which the second chip proceeds. And the possibility that the second chips are entangled with each other. That is, a protruding portion 9A having a relatively large height is provided between the first chip and the second chip that are particularly easily entangled, and a plurality of pieces are provided to prevent the second chip and other chips from being entangled. Projection 25 is provided.

  For the reasons described above, the cutting insert 1 of the present embodiment has a pair of protruding portions 9A that protrude toward the groove portion 21 that is present at the position closest to the corner portion of the upper surface 3 among the plurality of groove portions 21. A plurality of protrusions 25 are provided between the pair of protruding portions 9A.

  And in the cutting insert 1 of this embodiment, several protrusion 25 is provided radially toward each of the some division | segmentation cutting blade 23 pinched | interposed into the groove part 21 located on the extension line of a pair of protrusion part 9A. . Therefore, each of the chips generated by the plurality of divided cutting blades 23 sandwiched between the groove portions 21 passes over the plurality of protrusions 25. Thereby, the possibility that the respective chips are intertwined can be reduced.

<Cutting tools>
Next, a cutting tool 101 according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 7, the cutting tool 101 of the present embodiment has a rotation center axis S, a holder 103 having a plurality of insert pockets 105 on the outer peripheral surface on the front end side, and the above-described insert pockets 105. The cutting insert 1 is provided.

  The holder 103 has a substantially rotating body shape around the rotation center axis S. A plurality of insert pockets 105 are provided at equal intervals on the outer peripheral surface on the tip side of the holder 103. The insert pocket 105 is a part to which the cutting insert 1 is attached, and is open on the outer peripheral surface and the front end surface of the holder 103.

  Then, the cutting insert 1 is mounted in a plurality of insert pockets 105 provided in the holder 103. The plurality of cutting inserts 1 are mounted such that the cutting edge 19 protrudes outward from the outer peripheral surface.

  In the present embodiment, the cutting insert 1 is mounted in the insert pocket 105 with a bolt 107. That is, the bolt 107 is inserted into the through hole 17 of the cutting insert 1, the tip of the bolt 107 is inserted into a screw hole (not shown) formed in the insert pocket 105, and the screw portions are screwed together, thereby cutting. The insert 1 is attached to the holder 103.

  In the present embodiment, the cutting insert 1 is mounted on the holder 103 such that the cutting edge 19 protruding outward from the outer peripheral surface has a positive axial rake angle. That is, the cutting edge 19 of the cutting insert 1 disposed on the outer peripheral surface side of the holder 103 is inclined so as to be farther from the rotation center axis S of the holder 103 as it goes from the front end side to the rear end side of the holder 103 in a side view. doing. With such a configuration, it is possible to reduce cutting resistance applied during cutting.

  In the cutting tool 101 of this embodiment, you may use combining the some cutting insert 1 from which the number of the groove parts 21 differs. In this example, the cutting insert 1A having an odd number of grooves 21 on the side surface 7 and the cutting insert 1B having an even number of grooves 21 on the side surface 7 are used in combination. Specifically, the divided cutting edge 23 of the cutting insert 1A is provided corresponding to the groove portion 21 of the cutting insert 1B. Moreover, the division | segmentation cutting edge 23 of the cutting insert 1B is provided corresponding to the groove part 21 of the cutting insert 1A.

  The cutting insert 1A and the cutting insert 1B are preferably arranged alternately on the holder 103 as shown in FIG. By using such a combination of the cutting insert 1A and the cutting insert 1B, the uncut portion remaining by the groove 21 of the cutting insert 1A can be cut by the cutting edge 19 of the cutting insert 1B, and the flat work surface is stabilized. Can be obtained.

  In this example, as the cutting insert 1A and the cutting insert 1B, the main body portion, the groove 21 and the first cutting edge 19 are all equal in size, but as described above, one cutting insert 1A is used. The 1st cutting blade 19 should just respond | correspond to the groove part 21 of the other cutting insert 1B.

  As the holder 103, steel, cast iron, or the like can be used. In particular, it is preferable to use steel having high toughness among these members.

<Cutting method of work material>
Next, a method for cutting the work material 201 according to an embodiment of the present invention will be described with reference to the drawings.

The cutting method of this embodiment includes the following steps. That is,
(1) a step of rotating the cutting tool 101 represented by the above embodiment;
(2) a step of bringing the cutting edge 19 in the rotating cutting tool 101 into contact with the work material 201;
(3) a step of separating the cutting tool 101 from the work material 201;
It has.

  More specifically, first, the cutting tool 101 is relatively moved closer to the work material 201 as shown in FIG. Next, as shown in FIG. 9, the cutting tool 101 or the work material 201 is rotated, the cutting blade 19 of the cutting tool 101 is brought into contact with the work material 201, and the work material 201 is cut. Then, as shown in FIG. 10, the cutting tool 101 is relatively moved away from the work material 201.

  In the cutting method of the work material 201 of the present embodiment, since the cutting insert 1 has a plurality of protrusions 25 extending from the breaker surface 11 to the rake face 13, the possibility that chips are entangled with each other is reduced. , Chips can be discharged well.

  In FIG. 8, the work material 201 is fixed and the cutting tool 101 is brought closer. In FIG. 9, the work material 201 is fixed and the cutting tool 101 is rotated. In FIG. 10, the work material 201 is fixed and the cutting tool 101 is moved away. In the cutting method of the present embodiment, the work material 201 is fixed and the cutting tool 101 is moved in each step, but it is naturally not limited to such a form.

  For example, the work material 201 may be brought close to the cutting tool 101 in the step (1). Similarly, in the step (3), the work material 201 may be moved away from the cutting tool 101. In the case of continuing the cutting process, the state where the cutting tool 101 is rotated and the cutting blade 19 of the cutting insert 1 is brought into contact with a different part of the work material 201 may be repeated. When the used cutting edge 19 is worn, the cutting insert 1 may be rotated 90 degrees with respect to the central axis of the through hole 17 and the unused cutting edge 19 may be used.

  Note that typical examples of the material of the work material 201 include carbon steel, alloy steel, stainless steel, cast iron, and non-ferrous metal.

DESCRIPTION OF SYMBOLS 1 ... Cutting insert 3 ... Upper surface 5 ... Lower surface 7 ... Side surface 9 ... Main surface part 9A ... Projection part 11 ... Breaker surface 13 ... Rake face 15 ... Land surface 17 ... through hole 19 ... cutting blade 21 ... groove 23 ... divided cutting blade 25 ... projection 25A ... first projection 25B ... second projection 101 ... Cutting tool 103 ... Holder 105 ... Insert pocket 107 ... Bolt 201 ... Work material

Claims (10)

The bottom surface,
Breaker surface height becomes lower toward the outer peripheral, the main surface portion surrounded by the breaker surface located at the center, and positioned so as to surround the breaker face, the height is increased toward the outer periphery salvation An upper surface having a surface;
Side surfaces connected to each of the lower surface and the upper surface;
A cutting blade located at the intersection of the side of the upper surface and the side surface;
A cutting insert provided with a corner cutting edge located at the intersection of the upper surface corner and the side surface,
A plurality of grooves having one end reaching the upper surface is formed on the side surface,
The cutting edge comprises a plurality of divided cutting blades divided by the plurality of grooves.
A plurality of protrusions extending from the breaker surface to the rake surface on the upper surface;
The plurality of protrusions have a first protrusion and a second protrusion adjacent to each other,
The first protrusion and the second protrusion extend toward one of the plurality of divided cutting blades sandwiched by the plurality of groove portions,
An interval between the first protrusion and the second protrusion is increased toward the outer periphery of the upper surface ;
The main surface portion has a protruding portion protruding toward the groove portion closest to the corner of the upper surface among the plurality of groove portions, and the protruding portion is higher in height than the plurality of protrusions. Cutting insert characterized by.   The cutting insert according to claim 1, wherein at least some of the plurality of protrusions extend toward the plurality of grooves. The cutting insert according to claim 1 or 2 , wherein a width of at least one of the plurality of protrusions is constant from the breaker surface to the rake surface. The cutting insert according to any one of claims 1 to 3 , wherein at least one of the plurality of protrusions has a constant height from the breaker surface and the rake face. The height from the lower surface of the divided cutting blade located at the center among the plurality of divided cutting blades is lower than the height from the lower surface of the divided cutting blade located at both ends. Item 5. The cutting insert according to any one of Items 1 to 4 . The cutting insert according to any one of claims 1 to 5 , wherein the plurality of protrusions extend radially from the breaker surface toward the rake face. In the plurality of protrusions, the height of the end on the breaker surface side is lower than the height of the end of the breaker surface on the extension line of the plurality of protrusions, and the height of the end on the rake face side The cutting insert according to any one of claims 1 to 6 , wherein the cutting insert is lower than a height of an end of the rake face on an extension line of the plurality of protrusions. The cutting insert according to any one of claims 1 to 7 , wherein the plurality of protrusions have the same width. The cutting insert according to any one of claims 1 to 8 ,
A cutting tool comprising a holder on which the cutting insert is mounted. Rotating the cutting tool according to claim 9 ;
Contacting the work piece with the cutting edge in the rotating cutting tool;
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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