JP2020049601A - Cutting insert and cutting tool using the cutting insert - Google Patents

Abstract

To provide a cutting insert that can be stably fixed to a tool main body and can supply sufficient cooling media to a cutting blade, and a cutting tool.SOLUTION: A cutting insert 2 has a convex part 10 protruding from a side surface 23. A tool main body 3 corresponding to the cutting insert 2 has an inclined surface 14 that contacts the convex part 10 from the opposite side of a mounting bearing surface 31 and a first jet port 37 through which cooling media are supplied from a flank surface side. In the convex part 10 is formed a slit S along a straight line L connecting the first jet port 37 to a cutting blade 25.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cutting insert and a cutting tool using the cutting insert.

  In the mounting type where the replaceable cutting insert is mounted on the tool body, the lever lock type that presses the cutting insert corner into the corner of the insert seat of the tool body and tightens it is more than the screw-on type that presses the upper surface of the cutting insert with the screw head Also has excellent operability when changing cutting inserts. Further, the lever lock type is less likely to hinder chip processing than the clamp-on type or the double clamp type in which the upper surface of the cutting insert is pressed by a pressing piece. On the other hand, the lever lock type tool body tends to have a weak restraining force in the direction in which the cutting insert floats because the fixing screw is omitted.

  Therefore, a cutting insert having a convex portion on the side surface has been proposed. For example, the cutting insert 14 described in Patent Literature 1 includes a protrusion 54 on the peripheral surface 38 between the two end surfaces 36. The insert support surface 20 included in the pocket 16 of the tool body 12 generates a normal drag toward the insert seat surface 18 when it comes into contact with the protrusion 54.

  That is, the cutting insert having the convex portion on the side surface can suppress the floating from the tool body. Therefore, it is suitable for heavy cutting with a high cutting load. However, when the thermal conductivity of the work material is low, when the cutting load is increased, heat is trapped in the cutting insert, so that the life of the cutting edge may be unstable. BACKGROUND ART There has been provided a cutting tool capable of supplying a cooling medium such as a coolant from two directions, a rake face side and a flank face side, for cooling a cutting insert. The coolant supplied from the flank side is particularly important for extending the life of the cutting edge because it lubricates between the workpiece and the cutting edge.

JP-T-2005-505519

However, if there is a convex portion on the side surface, the cooling medium supplied to the cutting edge decreases due to interference with the cooling medium injected from the flank side. If the cooling medium is insufficient, there is a possibility that cutting heat is diverged and lubrication of the cutting edge is delayed. Even if there is a binding force capable of coping with heavy cutting, high efficiency cutting cannot be performed unless the cooling medium from the flank side is sufficient.
Therefore, an object of the present invention is to provide a cutting insert and a cutting tool that can be stably fixed to a tool body and can supply a sufficient cooling medium to a cutting edge.

  A cutting insert according to one aspect of the present invention includes a cutting edge formed on a ridgeline where a rake face and a side face intersect, and a convex portion formed on the side face and protruding from the side face. A slit is formed in the convex portion so as to extend in a direction intersecting the ridge line.

  A cutting tool according to one embodiment of the present invention is a cutting tool including a cutting insert and a tool body for fixing the cutting insert, wherein the cutting insert is formed on a ridge line at which a rake face and a side face intersect. And a convex portion formed on the side surface and protruding from the side surface. The tool body includes a mounting seat surface on which a seating surface of the cutting insert located on the side opposite to the rake surface is seated, a wall surface rising from the mounting seat surface and facing the side surface, and a mounting seat surface formed on the wall surface. It has an inclined surface that is inclined at an acute angle with respect to the mounting seat surface and abuts on the projection from the side opposite to the mounting seat surface, and a first injection port that blows the cooling medium from the flank surface side to the cutting edge. . The projection has a slit formed along a straight line connecting the first injection port and the cutting edge.

  In these embodiments, since the convex portion is provided on the side surface, the cutting insert can be stably fixed to the tool body. However, if a convex portion is provided on the side surface serving as the flank, when the cooling medium such as a coolant is supplied to the cutting edge, the convex portion may interfere with the cutting edge, and the cooling medium supplied to the cutting edge may be reduced. According to these aspects, since the slit is provided in the projection, the cooling medium can be supplied directly to the cutting edge from the flank side. Work materials with low thermal conductivity can be cut with high efficiency.

  In the above aspect, the tool body may further include a clamp member that presses the inner peripheral surface of the mounting hole that penetrates the rake surface and the seating surface to press the convex portion against the inclined surface.

  In this aspect, as a mounting type of the cutting insert, a lever lock type excellent in operability is adopted. In the case of the lever lock type in which the corner of the cutting insert is pressed into the insert seat of the tool body and tightened, the operability when exchanging the cutting insert is superior to the screw-on type in which the rake face of the cutting insert is pressed with a screw head. On the other hand, the lever lock type tool body tends to have a weak restraining force in the direction in which the cutting insert floats because the fixing screw is omitted. However, according to this aspect, since the convex portion is provided on the side surface of the cutting insert, it is difficult for the cutting insert to float from the insert seat even if the corner angle increases.

  In the above aspect, the tool main body further has a second injection port for spraying the cooling medium from the rake face side to the cutting edge, and the second injection port performs cutting in a direction from the rake face to the mounting seat surface. It may be provided at a position that does not overlap with the insert.

  According to this aspect, the second injection port can be provided at a position away from the cutting edge for cutting the work material, as compared with the mode in which the cutting insert and the second injection port overlap. If there is a second injection port near the cutting edge, chips flowing out from the cutting edge collide with the second injection port, and some of the chips are welded to the second injection port, 2 may be damaged. Further, the second injection port may hinder chip processing. In this aspect, the occurrence of such a problem can be suppressed by moving the second injection port away from the chips.

  A cutting insert according to one aspect of the present invention includes a cutting edge formed on a ridgeline at which a rake face and a side face intersect, and a plurality of protrusions formed on the side face and projecting from the side face. The rake face is formed in a polygon. The side surfaces include a plurality of flat surfaces located on each side of the rake surface. In at least one flat surface, at least two projections are arranged at a distance from each other in the flat surface.

  In this aspect, since there is a space between the adjacent convex portions and the cooling medium can pass through, the cooling medium can be supplied directly to the cutting edge from the flank side. Work materials with low thermal conductivity can be cut with high efficiency.

  ADVANTAGE OF THE INVENTION According to this invention, the cutting insert and the cutting tool which can be stably fixed to a tool main body and can supply sufficient cooling medium to a cutting edge can be provided.

FIG. 1 is a perspective view showing an example of the cutting tool according to the first embodiment of the present invention. FIG. 2 is a perspective view showing an example of the cutting insert shown in FIG. FIG. 3 is a side view schematically showing a first modification of the slit shown in FIG. FIG. 4 is a side view schematically showing a second modification of the slit shown in FIG. FIG. 5 is a side view schematically showing a third modification of the slit shown in FIG. FIG. 6 is a side view schematically showing a fourth modification of the slit shown in FIG. FIG. 7 is a side view schematically showing a fifth modification of the slit shown in FIG. FIG. 8 is a side view schematically showing a sixth modification of the slit shown in FIG. FIG. 9 is a plan view showing the vicinity of the cutting edge shown in FIG. FIG. 10 is a front view showing a state where the cutting tool shown in FIG. 1 is cutting a work material. FIG. 11 is a sectional view taken along line XI-XI in FIG. FIG. 12 is an enlarged sectional view showing the inclined surface shown in FIG. FIG. 13 is a perspective view showing a state where coolant is supplied to the cutting edge from the flank side. FIG. 14 is a left side view showing the trajectory of the coolant when the coolant is to be supplied from the flank side over the convex portion. FIG. 15 is a perspective view showing an example of the cutting tool according to the second embodiment of the present invention. FIG. 16 is a perspective view showing another example of the cutting insert shown in FIG.

  A preferred embodiment of the present invention will be described with reference to the accompanying drawings. In each of the drawings, the components denoted by the same reference numerals have the same or similar configurations. One of the features of the cutting insert 2 according to each embodiment of the present invention is that it has a convex portion 10 in which a slit S is formed (FIGS. 2 to 9 and 16).

  The cutting insert 2 has the convex portion 10 provided on the side surface 23 of the cutting insert 2, so that it is difficult for the cutting insert 2 to float from the insert seat 30 (see FIGS. 11 and 12). Since the slits S are formed in the protrusions 10, the cooling medium can be directly supplied to the cutting edge 25 even if the protrusions 10 are present (see FIGS. 13 to 15). Hereinafter, each configuration will be described in detail with reference to FIGS. 1 to 16.

[First Embodiment]
FIG. 1 is a perspective view showing an example of a cutting tool 1 according to the first embodiment of the present invention. As shown in FIG. 1, the cutting tool 1 includes a regular pentagonal cutting insert 2 and a tool body 3 for fixing the cutting insert 2. The shank of the tool body 3 is fixed to, for example, a tool rest of a lathe. At the tip of the tool body 3, an insert seat 30 to which the cutting insert 2 is fixed is formed. In the following description, the direction from the rake face to the seating face of the cutting insert 2 fixed to the insert seat 30 may be referred to as downward, and the direction from the seating face to the rake face may be referred to as upward.

  The insert seat 30 has a mounting seat surface 31 facing the seat surface (for example, the lower surface 22) of the cutting insert 2, and a wall surface 32 rising upward from the mounting seat surface 31. A replaceable shim 33 may be interposed between the lower surface 22 and the mounting seat surface 31. Most of the tool body 3 including the insert seat 30 is formed of, for example, steel. The spread metal 33 is formed of, for example, a cemented carbide, and is less likely to be deformed than other parts formed of a steel material. According to the example shown in FIG. 1, the easily damaged portion is configured to be replaceable and hardly deformed, so that the life of the tool body 3 can be extended.

  In the example shown in FIG. 1, the mounting type of the cutting insert 2 is configured as a lever lock type in which the corner 20 of the cutting insert 2 is pushed into the corner of the insert seat 30 and tightened. The tool body 3 is not limited to the lever lock type, and may be a screw-on type or the like in which a rake face (for example, the upper surface 21) of the cutting insert 2 is pressed with a screw head. In the case of the lever lock type, the tool main body 3 includes a clamp member 34 provided on the insert seat 30 for detachably fixing the cutting insert 2 and a tightening screw 35 for operating the clamp member 34. The clamp member 34 is, for example, an L-shaped metal part.

  When the tightening screw 35 is tightened, the proximal end of the clamp member 34 is pushed down, and the distal end of the clamp member 34 presses the inner peripheral surface of the mounting hole 24 of the cutting insert 2. The pressed cutting insert 2 moves in a direction toward the tightening screw 35, and the side surface 23 contacts the wall surface 32 of the insert seat 30. Conversely, when the tightening screw 35 is loosened, the force of the tip of the clamp member 34 pressing the inner peripheral surface of the mounting hole 24 of the cutting insert 2 is weakened, and the cutting insert 2 can be removed from the insert seat 30.

  As shown in FIG. 1, near the insert seat 30, first and second injection ports 37 and 36 for injecting a cooling medium such as a coolant or air toward the cutting insert 2 are additionally provided. In the example shown in FIG. 1, the second injection port 36 is formed at the tip of a coolant nozzle attached near the insert seat 30. A configuration may be employed in which a cutting nozzle 2 can be exchanged without removing the coolant nozzle by mounting a telescopic coolant nozzle.

  The second injection port 36 injects the coolant to the cutting edge 25 from the rake face side (in the example shown in FIG. 1, the upper face 21 side). When a high-pressure cooling medium is supplied from the rake face side, chips can be finely divided and stably processed. Further, the rake face can be cooled to suppress crater wear. The first injection port 37 is formed further below the mounting seat surface 31 with respect to the cutting insert 2. Although not shown, the first injection port 37 may be configured as an external coolant nozzle. The first injection port 37 injects the cooling medium to the cutting edge 25 from the flank side (in the example shown in FIG. 1, the side surface 23 on the near side in the drawing).

  When the cooling medium is not air but a coolant (for example, oil-based or water-soluble cutting oil), in addition to cooling the cutting edge 25, it is possible to lubricate between the work material and the cutting edge 25, 26. The coolant supplied from the flank side is important for extending the life of the cutting edge because it lubricates between the workpiece and the cutting edge 25. In particular, the corner 20 is located at the tip of the cutting insert 2, and boundary wear is likely to develop from the cutting edge to the flank.

  In addition, the maximum cut portion (cut boundary portion) faces the casting surface or the burnt surface which is harder than other portions of the work material, and also faces the surface of the work material which has been hardened by plastic deformation due to cutting. Therefore, boundary wear easily develops from the cutting edge to the flank. As a countermeasure, by supplying the coolant from the flank side, wear on the flank side can be suppressed. As will be described in detail later with reference to FIGS. 13 and 15, the present invention can supply coolant to both the corner 20 and the maximum notch (for example, the center of the cutting edge 25), which are particularly likely to be worn. Boundary wear of the cutting edge 25 can be suppressed.

  The pressure of the coolant injected from the first and second injection ports 37 and 36 is, for example, 1 MPa or more and 30 MPa or less, and preferably 5 MP or more. The limiting factor of the upper limit pressure (for example, a hose for supplying a coolant to the cutting tool 1) may be changed from a general-purpose part to a pressure-resistant part to make the pressure higher than 30 MPa. If the pressure of the coolant is increased, the above-described effect is further increased. For example, a high-pressure (for example, 5 MPa or more) coolant is more stable in chip processing than a normal-pressure (for example, about 1 to 1.5 MPa) coolant, and can reduce machine stoppage (downtime) due to trouble. Crater wear and flank wear can be suppressed by dispersing the cutting heat. In FIGS. 13 to 15 described later, a high-pressure coolant of 7 MPa is sprayed on the cutting edge 25.

  FIG. 2 is a perspective view illustrating an example of the cutting insert 2. In each embodiment, the material of the cutting insert 2 is not particularly limited. Various cutting insert materials such as cemented carbide can be applied. As shown in FIG. 2, the cutting insert 2 includes an upper surface 21, a lower surface 22 opposite to the upper surface 21, a side surface 23 connecting the upper surface 21 and the lower surface 22, and a mounting hole 24 passing through the upper surface 21 and the lower surface 22. ,have. The upper surface 21 and the lower surface 22 are each formed in a substantially regular pentagon. The angles of the corners 20 formed on the upper surface 21 and the lower surface 22 at five points are all 108 °.

  The upper surface 21 and the lower surface 22 have substantially the same shape and function. In the cutting tool 1, the upper surface 21 may be a rake surface and the lower surface 22 may be a seating surface (see FIG. 1). The upper surface 21 may be a seating surface, and the lower surface 22 may be a rake surface. Therefore, the upper surface 21 will be described in detail as a representative, and overlapping description of the lower surface 22 will be omitted.

  In the example shown in FIG. 2, the diameter of the inscribed circle of the upper surface 21 and the lower surface 22 is, for example, 19.05 mm. The thickness (width of the side surface 23) of the cutting insert 2 is, for example, 6.35 mm. The diameter of the mounting hole 24 is, for example, 7.9 mm. The dimensions of the cutting insert 2 are not limited to the example shown in FIG. For example, the inscribed circle of the cutting insert 2 may be made larger so as to be able to cope with a larger cutting depth.

  The first ridgeline R1 where the upper surface 21 and the side surface 23 intersect has a cutting edge formed over the entire circumference. In the example shown in FIG. 2, the cutting edges (ridge line R1) include five corner cutting edges formed at the corners 20 and five main cutting edges 25 formed between the adjacent corners 20. In. Similarly, a cutting edge is formed over the entire circumference of the second ridge line R2 where the lower surface 22 and the side surface 23 intersect. The cutting edges (ridge line R2) include five corner cutting edges formed at the corners 20 and five main cutting edges 26 formed between adjacent corners 20.

  The cutting insert 2 may be a single-sided type in which a cutting edge is formed on only one of the upper surface 21 and the lower surface 22. The main cutting edge 25 is disposed at a position displaced by 72 ° from the mounting hole 24. Similarly, the main cutting edge 26 is arranged at a position displaced by 72 ° from the mounting hole 24. In the following description, the main cutting edges 25 and 26 may be simply referred to as cutting edges 25 and 26.

  In each of the cutting edges 25 and 26, the first and second ridge lines R1 and R2 are substantially straight lines. The angle (corner angle) between adjacent cutting edges 25 or an extension thereof is 108 °, and the angle (corner angle) between adjacent cutting edges 26 or an extension thereof is 108 °. That is, the cutting insert 2 is formed in a regular pentagon. The cutting insert 2 only needs to be approximately a regular pentagon, and a wiper blade (a flat blade) may be formed in a part of the corner 20. The wiper blade may be linear, arcuate, or elliptical.

  In the present invention, the cutting insert 2 is not limited to a substantially regular pentagon. The cutting insert 2 provided with the slit S may be, for example, a rhombus that can use two or four corners, or a hexagon that can use three or six corners, It may be a square that can use four or eight corners. In the example shown in FIG. 2, the cutting insert 2 is formed in mirror symmetry with respect to a mirror surface connecting the corner 20 (the vertex of the polygon formed by the cutting edges 25 and 26 or an extension thereof) and the mounting hole 24. ing.

  A chip breaker 29 may be provided on the upper surface 21 and the lower surface 22 along the cutting edges 25 and 26. In the example shown in FIG. 2, the chip breaker 29 includes a plurality of protrusions arranged along the cutting edge 25. When the projections constituting the chip breaker 29 are located near the cutting edges 25 and 26, the area where the high-temperature chips are in contact with the rake face of the cutting insert 2 becomes small, and the temperature of the cutting insert 2 rises. Can be suppressed. In the example shown in FIG. 2, the distance between the cutting edges 25 and 26 (ridge lines R1 and R2) and the projections is, for example, 0.3 mm or more and 1 mm or less.

  Hereinafter, in the description of the upper surface 21, the above-described upward protrusion amount may be referred to as a height. Similarly, in the description of the lower surface 22, the above-described downward projection amount may be referred to as a height. Each of the protrusions constituting the chip breaker 29 has a cross section in a direction parallel to the cutting edges 25 and 26 in a direction orthogonal to the cutting edges 25 and 26 so as not to hinder the flow of the coolant toward the cutting edges 25 and 26. Is formed to be smaller than the cross-sectional area of.

  In the example shown in FIG. 2, each projection is formed in an elongated spindle shape extending in a direction orthogonal to the cutting edges 25 and 26. More specifically, in each of the protrusions, the outer shape cut in the short direction orthogonal to the longitudinal direction is formed as a small-diameter semicircle, and the outer shape cut in the longitudinal direction is formed as a large-diameter arc. The protruding height (the maximum radius in the lateral direction) of the apex of each projection is preferably approximately the same as that of the cutting edges 25 and 26. The outer shape in the longitudinal direction is formed, for example, at R1.9 mm, which is larger than the protruding height of the apex. The shape of the chip breaker 29 is not limited to the example shown in FIG. Another example of the chip breaker 29 will be described later with reference to FIG.

  In the cutting insert 2 according to each embodiment, the convex portion 10 is formed on the side surface 23. The protrusion 10 protrudes from the side surface 23 and extends along the cutting edges 25 and 26. The projection 10 has, for example, a trapezoidal cross section when cut along a plane perpendicular to the cutting edges 25 and 26. The projection 10 has a first surface 11 whose projection height decreases toward the upper surface 21, a second surface 12 inclined so that the projection height decreases toward the lower surface 22, and the first surface 11 and the second surface 12. And a third surface 13 connecting the surfaces 12 and being parallel to the side surface 23. In addition, the cross section of the protrusion 10 is not limited to the example illustrated in FIG. 2, and may be a mountain shape in which the third surface 13 is omitted or may be another shape.

  As shown in FIG. 2, a slit S extending from the lower surface 22 to the upper surface 21 is formed in the protrusion 10. The direction from the lower surface 22 to the upper surface 21 is an example of a direction intersecting the first and second ridge lines R1 and R2. In the example shown in FIG. 2, slits S having a constant width are formed one by one in the center of the convex portion 10.

  Or, from a different viewpoint, it can be said that in the cutting insert 2 according to the present embodiment, the adjacent convex portions 101 and 102 are arranged with an interval S therebetween. The side surface 23 of the cutting insert 2 shown in FIG. 2 has five flat surfaces 230 (for example, a front side surface, a left side surface, a left rear side surface, and a right side) corresponding to five cutting edges 25 (each side of the upper surface 21). Rear and right sides).

  At least two projections 100 protruding from the flat surface 230 are formed on each flat surface 230. In the example shown in FIG. 2, a pair of convex portions 101 and 102 are formed. Note that three or more convex portions 100 may be formed. In each flat surface 230, adjacent convex portions 100 (for example, a pair of 101 and 102) are arranged with an interval S therebetween.

  3 to 8 are modifications of the slit (interval) S shown in FIG. In the present embodiment, the number of the slits S is not particularly limited. As shown in FIG. 3, a plurality of slits S may be formed in one projection. Further, the slit S may be a diagonal line obliquely crossing the thickness direction of the cutting insert 2 as shown in FIG. As shown in FIG. 5, an intersection line where a plurality of oblique lines intersect may be used. As shown in FIG. 6, it may be a curved curve. Although not shown, a slit combining a curve and a straight line may be used.

  As shown in FIG. 7, the slit S may be formed so as to be tapered toward the rake face (the upper face 21 and the lower face 22). When both ends of the slit S are thickened, the coolant and the like easily diffuse to the cutting edge (the first and second ridge lines R1 and R2). Although not shown, the slit S may extend to the vicinity of the first and second ridge lines R1 and R2 beyond the convex portion 10. In the case of a single-sided insert in which a cutting edge is formed only on one ridge line (for example, the first ridge line R1), only one end of the slit S may be formed to have a tapered end as shown in FIG.

  FIG. 9 is a plan view showing the vicinity of the cutting edge 25. As shown in FIG. 9, in the slit S, the side surface 23 from which the convex part 10 is removed and the cutting edges 25 and 26 are formed substantially flush. It should be noted that the shape of the slit S is not limited to the example shown in FIG. 9, and the protrusion 10 may be slightly left, and may be further depressed toward the mounting hole 24 than the virtual surface connecting the cutting edges 25 and 26. May be.

  FIG. 10 is a front view showing a state where the cutting tool 1 is cutting a work material. In the example shown in FIG. 10, the cutting tool 1 is configured for medium to heavy cutting. The cutting angle α suitable for medium to heavy cutting is, for example, 35 ° to 75 °. In the example shown in FIG. 10, the cutting insert 2 is fixed such that the cutting angle α formed by the work material and the cutting edges 25 and 26 is 48.5 °. Note that the cutting angle α of the cutting tool 1 can be appropriately changed depending on the application. When the cutting tool 1 is configured for high-feed machining (High Feed type), for example, the cutting angle α may be changed from 20 ° to 35 °.

FIG. 11 is a sectional view taken along line XI-XI in FIG. FIG. 12 is an enlarged sectional view showing the inclined surface 14 shown in FIG. As shown in FIGS. 11 and 12, in the insert seat 30 of the tool main body 3, the wall surface 32 is formed substantially perpendicular to the mounting seat surface 31 and the upper surface of the bedding 33. The wall surface 32 faces the side surface 23 of the cutting insert 2.

  The wall surface 32 includes the inclined surface 14 inclined at an acute angle with respect to the upper surface of the mounting seat surface 31 and the upper surface of the mat 33. The inclined surface 14 comes into contact with the first surface 11 or the second surface 12 of the projection 10 from above on the opposite side to the mounting seat surface 31. In the example shown in FIGS. 11 and 12, the inclined surface 14 is formed in parallel with the first surface 11 of the convex portion 10, and is in contact with the first surface 11 from above.

  FIG. 13 is a perspective view showing a state where coolant is supplied to the cutting edge 25 from the flank 23 side. As shown in FIG. 13, at least a part of the first injection port 37 injects a coolant toward an arbitrary portion on the cutting edge 25 (for example, a central portion of the cutting edge 25). The slit S is formed along a straight line L connecting this portion and the first injection port 37. The straight line L substantially coincides with the trajectory of the coolant injected from the first injection port 35. As described above, the maximum cut portion and the corner 20 are more likely to develop boundary wear than other portions. In the example shown in FIG. 13, a part of the first injection port 37 supplies coolant to a central portion (an example of a maximum cut portion) of the cutting edge 25, and the other part of the first injection port 37 is connected to the corner 20. To supply coolant.

  FIG. 14 is a left side view showing the trajectory of the coolant in the case where the coolant is to be supplied from the flank 23 side over the convex portion 10 by a two-dot chain line. There is only a slight gap between the projection 10 provided on the flank and the workpiece. As shown in FIG. 14, when the coolant is sprayed so as not to pass through the slit S but to get over the convex portion 10, the convex portion 10 becomes an obstacle and the coolant cannot be supplied directly to the cutting edge 25. .

  According to the cutting tool 1 and the cutting insert 2 of the first embodiment configured as described above, since the side surface 23 has the projection 10, the cutting insert 2 can be stably fixed to the tool body 3. . On the other hand, if the convex portion 10 is provided on the side surface 23 serving as the flank, as shown in FIG. 14, when the cooling medium such as the coolant is supplied to the cutting edges 25 and 26, the convex portion 10 becomes an obstacle, and the cutting edge 25 , 26 may be reduced. According to the present embodiment, since the slit S is provided in the convex portion 10, the cooling medium can be supplied directly to the cutting edges 25 and 26 from the flank 23 side. Work materials with low thermal conductivity can be cut with high efficiency.

  The power of the cutting process is mainly used for a shearing deformation work for the workpiece to be sheared by the cutting tool 1 and a frictional work generated between the rake face (for example, the upper face 21) and the chips. It becomes hot and is removed together with the chips. When the type of the work material is a titanium material, a heat-resistant alloy, or the like having a low thermal conductivity, the heat of the chips is not easily released, so that the temperature of the cutting insert 2 tends to increase.

  In this embodiment, since the distance between the cutting edges 25 and 26 and the projections constituting the chip breaker 29 is short, the chips can be removed before the heat of the chips is transmitted to the rake face (for example, the upper surface 21). . If the distance between the cutting edges 25 and 26 is too short, the projections of the chip breaker 29 may hinder cutting. In the present embodiment, since the protrusion of the chip breaker 29 is narrow, it does not easily interfere with cutting. Therefore, the present embodiment can be suitably used even under a condition where a cutting load such as a difficult-to-cut material is high.

  Further, in the present embodiment, as a mounting type of the cutting insert 2, a lever lock type which is hard to hinder chip processing is adopted. In the case of a lever lock type in which the corner 20 of the cutting insert 2 is sandwiched and tightened, the binding force in the direction in which the cutting insert 2 floats tends to be weaker than a screw-on type or a clamp-on type in which the upper surface 21 of the cutting insert 2 is pressed. . However, in the present embodiment, since the convex portion 10 is provided on the side surface 23, the cutting insert 2 is unlikely to rise from the insert seat 30.

  In the present embodiment, since the angle of the corner 20 is 108 °, which is an obtuse angle, the cutting edges 25 and 26 are not easily damaged. It can be suitably used even under a condition where a cutting load such as a difficult-to-cut material is high. As shown in FIG. 2, since the cutting insert 2 has a substantially regular pentagonal shape, a total of ten cutting edges 25 and 26 on the upper surface 21 and the lower surface 22 and ten corner cutting edges can be used, which is economical. When the angle of the corner 20 is an obtuse angle, the cutting insert 2 is easily lifted from the insert seat 30 of the tool body 3, but in the present embodiment, as shown in FIGS. It can be fixed securely by contact.

  As shown in FIG. 2, the cutting insert 2 according to the present embodiment is mirror-symmetric with respect to a mirror surface connecting the corner 20 and the mounting hole 24, and can be used for both right-hand and left-hand. It is formed without permission. Therefore, by attaching the cutting insert 2 to the right-hand tool body 3 shown in FIG. 10, the right-hand cutting tool 1 can be configured. Although not shown, the cutting tool 2 may be mounted on the left-hand tool body to form the left-hand cutting tool 1.

According to the present embodiment, the slit S is formed in the convex portion 10 on the side surface 23 of the cutting insert 2, whereby the cutting edge 2 can be stably fixed to the tool body 3, and a sufficient cooling medium can be supplied to the cutting edges 25 and 26. A cutting insert 2 and a cutting tool 1 can be provided.
Next, a cutting tool 1 according to a second embodiment of the present invention will be described. In the second embodiment, description of matters common to the first embodiment will be omitted, and only different points will be described.

[Second embodiment]
The second embodiment will be described with reference to FIGS. Drawing 9 is a perspective view showing an example of cutting tool 1 of a 2nd embodiment of the present invention. In the first embodiment, the second injection port 36 is configured as an external coolant nozzle, and the first injection port (front coolant hole) 37 is configured as an integral structure with the tool body 3. In the second embodiment, as shown in FIG. 15, a second injection port (upper coolant hole) 36 is configured as an integral structure with the tool main body 3.

  In the second embodiment, the second injection port 36 is provided at a position that does not overlap with the cutting insert 2 in a direction from the rake face (for example, the upper surface 21) to the mounting seat surface 31. Therefore, as compared with the first embodiment shown in FIG. 13, the second injection port 36 can be provided at a position away from the cutting edge 25 for cutting the work material.

  If there is the second injection port 36 near the cutting edge 25, the chips flowing out from the cutting edge 25 collide with the second injection port 36, and a part of the chips There is a possibility that welding or damage to the second injection port 36 may occur. Further, the second injection port 36 may hinder chip processing. On the other hand, in the second embodiment, the occurrence of such a problem can be suppressed by moving the second injection port 36 away from the chips.

  In the cutting insert 2, the generation of heat may be suppressed by reducing the cutting resistance. FIG. 16 is a perspective view showing the cutting insert 2 shown in FIG. In the example shown in FIG. 16, the distance between the cutting edges 25 and 26 and the chip breaker 29 is larger than that in the example shown in FIG. 2, and a rake face having a sufficient length is secured. Further, the cutting edges of the cutting edges 25 and 26 shown in FIG. 16 are formed more sharply than the cutting edges of the cutting edges 25 and 26 shown in FIG. 2, and the rake angle of the cutting insert 2 alone becomes larger. ing.

  When the type of work material is stainless steel or the like whose hardness increases with an increase in temperature, the above-described shearing work increases, so that the temperature of the cutting insert 2 tends to increase. According to the second embodiment, similarly to the first embodiment, to provide a cutting insert 2 and a cutting tool 1 that can be stably fixed to the tool body 3 and can supply a sufficient cooling medium to the cutting edges 25 and 26. Can be. Moreover, in the second embodiment, the generation of heat can be suppressed by reducing the cutting resistance.

  The embodiments described above are intended to facilitate understanding of the present invention, and are not intended to limit and interpret the present invention. The components included in the embodiment and their arrangement, material, condition, shape, size, and the like are not limited to those illustrated, but can be appropriately changed. It is also possible to partially replace or combine the configurations shown in the different embodiments.

  DESCRIPTION OF SYMBOLS 1 ... Cutting tool, 2 ... Cutting insert, 3 ... Tool body, 10, 100, 101, 102 ... Convex part, 11 ... 1st surface, 12 ... 2nd surface, 13 ... 3rd surface, 14 ... Inclined surface, 20 ... corner, 21 ... upper surface (an example of a rake surface), 22 ... lower surface (an example of a seating surface), 23 ... side surface (an example of a flank surface), 24 ... mounting holes, 25, 26 ... cutting edges, 29 ... chip breakers, DESCRIPTION OF SYMBOLS 30 ... Insert seat, 31 ... Mounting seat surface, 32 ... Wall surface, 33 ... Cover, 34 ... Clamping member, 35 ... Tightening screw, 36 ... Second injection port, 37 ... First injection port, 38 ... Channel , 230: flat surface, L: straight line, R1: first ridge line (an example of ridge line), R2: second ridge line, S: slit (interval).

Claims (5)

A cutting edge formed on the ridge line where the rake face and the side face intersect,
Having a convex portion formed on the side surface and protruding from the side surface,
The cutting insert, wherein a slit extending in a direction intersecting the ridge line is formed in the convex portion. A cutting tool comprising a cutting insert and a tool body for fixing the cutting insert,
The cutting insert,
A cutting edge formed on the ridge line where the rake face and the side face intersect,
Having a convex portion formed on the side surface and protruding from the side surface,
The tool body is
A mounting seat surface on which a seating surface of the cutting insert located on the opposite side to the rake surface is seated;
A wall surface rising from the mounting seat surface and facing the side surface;
An inclined surface formed on the wall surface and inclined at an acute angle with respect to the mounting seat surface, and in contact with the convex portion from the opposite side to the mounting seat surface;
A first injection port for blowing a cooling medium from the flank side to the cutting edge,
A cutting tool, wherein a slit is formed in the projection along a straight line connecting the first injection port and the cutting edge.   The cutting tool according to claim 2, wherein the tool body further includes a clamp member that presses an inner peripheral surface of a mounting hole that penetrates the rake surface and the seating surface to press the convex portion against the inclined surface. . The tool body further includes a second injection port for blowing a cooling medium from the rake face side to the cutting edge,
The cutting tool according to claim 2, wherein the second injection port is provided at a position not overlapping with the cutting insert in a direction from the rake face to the mounting seat face. 5. A cutting edge formed on the ridge line where the rake face and the side face intersect,
A plurality of protrusions formed on the side surface and protruding from the side surface,
The rake face is formed in a polygon,
The side surface includes a plurality of flat surfaces located on each side of the rake surface,
A cutting insert, wherein at least one flat surface has at least two said protrusions spaced apart from each other in said flat surface.

Images