• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    cutting insert is provided a cutting insert where cutting resistance can be reduced under a wide range of cutting conditions, and where it is possible to treat waste in a stable manner. this cutting insert is provided with chip-forming grooves formed within the corner cutting edges, and protruding sections that protrude out of the chip-forming grooves. each projection section comprising a top surface, a frontal projection surface, and lateral projection surfaces. each top surface intersects with both front overhang and side overhang surfaces. a first section of intersecting ridge line where the frontal overhang surface intersects with the top surface extends linearly. second intersecting crest line sections where the lateral protruding surfaces intersect with the top surface extending from both ends of the first intersecting crest line section such that with increased distances from the corner cutting edge, the distance from the cutting edges of the corresponding lateral crest increases gradually. the front protruding surface is convexly curved outwardly. the side protruding surfaces are also curved outwardly.
    公开号:BR112012008834B1
    申请号:R112012008834-3
    申请日:2010-10-05
    公开日:2021-04-13
    发明作者:Shizue Konta
    申请人:Tungaloy Corporation；
    IPC主号:
    专利说明:

    Technical Field
    [0001] The present invention relates to a cutting insert installed in an alignable cutting tool. Fundamentals of Technique
    [0002] A cutting insert has been known, which is shaped like a polygonal plate and includes a cutting edge formed at an intersecting portion between an upper surface and each side surface of the cutting insert. To allow chips to be properly processed, the cutting insert includes a chip-forming groove formed between a central portion thereof and each corner cutting edge formed in a corresponding portion of the upper surface corner portions, with a break projection -cavac which is provided in the chip-forming groove.
    [0003] A cutting insert described in Patent Document 1 is characterized by including projecting portions, each projecting from its central portion into the chip-forming groove in the direction of the corresponding corner cutting edge, and projecting portions, each one protruding beyond the corresponding projecting portion in the direction of the corresponding corner cutting edge and where an elevated inclined portion is provided between the projecting portion and the chip-forming groove. Citation List Patent Literature
    [0004] Patent Document 1: Japanese Patent Open to Public Inspection No. H06-190612 (1994) Summary of the Invention Technical problem
    [0005] However, in the cutting insert described in Patent Document 1, the raised portion of the projecting portion is a flat sloping surface, resulting in a large area of contact between the raised portion and chips. This tends to increase the cut resistance (frictional resistance) between the chips and the cutting insert. In addition, the cutting insert has a two-stage construction including the projecting portion projecting towards the corner cutting edge and the projecting portion projecting beyond the projecting corner towards the corner cutting edge. Thus, if an attempt is made, at a great depth of cut, to allow the chips to contact the projecting portion and thus be rolled up, the projecting portion may excessively block the chips from increasing cut resistance, depending on the cutting conditions.
    [0006] If the cutting insert in Patent Document 1 is reconfigured in order to operate effectively at a great depth of cut in order to deal with the problem described above, then at a small depth of cut, the chips are insufficiently blocked and so unsteadily tangled.
    [0007] The present invention was developed to solve the problems described above. An objective of the present invention is to provide a cutting insert that allows stable chip processing and a reduction in cut resistance under a wide range of conditions. Solution of the problem
    [0008] The present invention provides a cutting insert formed from a plate-like member with a substantially polygonal external shape and comprising an inclined face formed on at least one of the opposite surfaces of the plate-like member, a flank formed in one lateral surface extended between the opposing surfaces, and cutting edges, each formed at an intersecting portion where the sloping face and the flank intersect, the cutting edge comprising corner cutting edges formed in respective corner portions of the surface opposite with the slanted face formed therein and lateral cut edges formed along a pair of side edge portions extending on opposite sides of each of the corner cut edges, the cut insert being characterized by the fact that one chip-forming groove formed on the opposite surface with the slanted face formed therein and within the corner cutting edge comprises a raised portion, elevated to ci From an interior of the chip-forming groove, the raised portion comprises an upper surface comprising an upper portion of the raised portion, a raised front surface facing the corner cutting edge and extended from the chip-forming groove to the upper surface, and side elevated portions arranged on opposite sides of the front elevated portion, and the upper surface intersects both the front elevated surface and each of the side elevated surfaces, and in which a first intersecting portion on which the front elevated surface and the the upper intersecting surface is linearly extended, a second intersecting portion in which each of the elevated lateral surfaces and the upper intersecting surface is extended from a counterpart on opposite sides of the first intersecting portion and comprises a portion for the which a distance from the corresponding side cutting edge gradually increases With a distance from the corner cutting edge, the front raised surface is curved to project outward, and the raised side surfaces are each curved to project outward.
    [0009] According to the configuration described above, the front elevated surface faces an front end of the corresponding corner cutting edge and extends from the chip-forming groove to the upper surface, and the first intersecting portion where the front elevated surface and the upper intersecting surface are linearly extended. Thus, the raised front surface allows chips to be blocked and reliably controlled. In addition, chips that contact the raised front surface can be controlled in a given direction in a controlled manner. This allows the chips that contact the front raised surface to be stably rolled. In addition, the raised front surface is curved in a protruding manner. Consequently, chips that contact the front raised surface can be quickly separated from the front raised surface. This allows possible excessive contact between each of the raised front surfaces and the chips to be prevented. Consequently, chip scattering can be suppressed, and cut resistance can be reduced.
    [00010] In addition, in the configuration described above, the second intersecting portion in which each of the lateral elevated surfaces and the upper surface intersect each other extends in a direction in which the second intersecting portion leaves the corresponding cutting edge corner, while being curved so that the corresponding end of the opposite ends of the first intersecting portion protrudes, and the raised front surface is curved so that it protrudes outward. Thus, the distance from each of the lateral cutting edges to the front raised surface increases consistently with the depth of cut. This allows for the prevention mainly of chip scattering from the lateral cutting edges and an increase in cut resistance.
    [00011] In addition, each of the side elevated surfaces is curved to project outward, thus allowing chips that contact the side elevated surface to be quickly separated from the side elevated surface. This allows possible excessive contact between each of the raised side surfaces and the chips to be prevented. As a result, chip scattering can be suppressed, and cut resistance can still be reduced.
    [00012] Preferably, the corner cutting edge is a round corner, and a length of the first intersecting portion is at least 0.05 mm and is set equal to, or less than, a radius of curvature of the cutting edge of corner.
    [00013] Preferably, a connecting portion between the front raised surface and each of the lateral raised surfaces is curved so as to project towards the corresponding corner cutting edge. Preferably, the radius of curvature of each of the raised side surfaces gradually increases with a distance from the corresponding corner cutting edge when viewed in a cross section taken parallel to a straight line from the first intersecting portion and perpendicular to the opposite surfaces.
    [00014] Preferably, a difference in height between the highest position and the lowest position of each of the raised side surfaces gradually increases with a distance from the corresponding corner cutting edge when viewed in a cross section taken parallel a straight line from the first intersecting portion and perpendicular to opposite surfaces.
    [00015] Preferably, each of the lateral cutting edges comprises an inclined portion with a height gradually decreasing with a distance from the corresponding corner cutting edge. Advantageous Effects of the Invention
    [00016] The present invention allows for stable chip processing and a reduction in cut resistance under a wide range of cutting conditions for the depth of cut. At a small depth of cut, the raised front surface, which is wide, blocks and reliably controls the chips. In addition, chips that contact the raised front surface can be controlled in a constant direction in a controlled manner. Thus, the chips that contact the front raised surface can be stably rolled up. Furthermore, at a great depth of cut, since the second intersecting portion in which each of the elevated lateral surfaces and the upper surface intersect each other is extended in the direction in which the second intersecting portion leaves the corresponding edge of corner cut, while being curved so that it protrudes from the corresponding end of the first intersecting portion. Thus, the distance from each of the lateral cutting edges to the corresponding raised side surface increases consistently with the depth of cut. This allows for the prevention mainly of chip scattering from the lateral cutting edges and an increase in cut resistance. In addition, possible excessive contact between each of the raised side surfaces and the chips can be prevented. As a result, chip scattering can be suppressed, and cut resistance can still be reduced. Brief Description of Drawings
    [00017] Figure 1 is a plan view of a cutting insert according to an embodiment of the present invention.
    [00018] Figure 2 is a cross-sectional view of the cutting insert taken along line A in figure 1.
    [00019] Figure 3 is an enlarged plan view of an essential part of the cutting insert shown in figure 1.
    [00020] Figure 4 is a cross-sectional view of the cutting insert taken along line IV-IV in figure 3.
    [00021] Figure 5 is a cross-sectional view of the cutting insert taken along line V-V in figure 3.
    [00022] Figure 6 is a cross-sectional view of the cutting insert taken along line VI-VI in figure 3. Description of Modalities
    [00023] A cutting insert according to an embodiment of the present invention will be described below with reference to the drawings. As shown in figure 1 and figure 2, the cutting insert is a plate-type member with a substantially rhombic external shape. An inclined face 2 is formed on one of the rhombic surfaces (opposite surfaces) of the cutting insert. The other rhombic surface serves as a seat face 4 which comes into contact with a lower surface of a pointed seat provided in a tool body of the cutting tool. A flank 3 is formed on a side plate-like surface that extends between the inclined face 2 and the seat face 4. The flank 3 crosses one of the rhombic surfaces (inclined face 2) so as to form an acute angle with the same, and has a positive flank angle. The flank angle is adjusted to a maximum of about 20 °. In the present mode, the flank angle is set to 7 °. The flank angle of each flank can be adjusted to 0 °. In this case, the opposing rhombic surfaces cross the flanks 3 at right angles, and both rhombic surfaces can be made available by selectively using one of the rhombic surfaces as the inclined face 2 and the other as the seating face 4. In the present embodiment, a circular arc corner cutting edge 5 is formed on a ridge portion of each of those corner portions of the cutting insert that form an acute angle. The circular arc forming the corner cutting edge 5 has a radius of curvature of 0.8 mm.
    [00024] The cutting edge 6 is formed along each lateral edge of the rhombic surface in which the inclined face 2 and the flank 3 intersect each other. The corner cutting edges 5 and cutting edges 6 as a whole serve as a cutting edge for a workpiece.
    [00025] As illustrated in figure 2, the cutting edge 6 includes an inclined portion 6a with a height gradually decreasing with increasing distance from the corresponding corner cutting edge 5. In the present embodiment, the inclined portion 6a is linearly inclined when seen from the side surfaces of the insert and a substantially constant tilt angle IA. The inclination angle IA can be adjusted by, for example, at least about 2 ° and at most about 15 °. In the present mode, the angle of inclination is set to 6 °. The angle of inclination IA can be varied depending on the position on the inclined portion 6 by, for example, forming the inclined portion 6a in the type of a curved line or using a plurality of straight lines. In addition, if the inclined portion 6 is shaped like a curved line, the inclination angle IA is defined by the mean of the angles between the tangent and a horizontal line at the respective positions of the inclined portion 6a. Even if the inclined portion 6a is formed of a plurality of straight line portions with different inclinations, the inclination angle IA is defined by the average of the angles between the tangent and the horizontal line at the respective positions of the inclined portion 6A. Even if the sloped portion 6a is formed of a plurality of linear portions with different slopes, the slope angle IA is defined by the mean of the slopes.
    [00026] The contour shape of the insert is not limited to a rhomboid, but can be changed to a substantial polygon, such as a square, a rectangle, a rectangular parallelepiped, or a triangle. At least a part of the sloping face 2, a part of the flank 3, and the corner cutting edges 5 and cutting edges 6 are formed of a hard material such as cemented carbide, covered cemented carbide, cermet, or ceramic, or a compact sintered at extra high pressure, such as a diamond compact or a compact sintered with cubic boron nitride.
    [00027] In the present embodiment, a mounting hole 9 is formed in a central portion of the rhombic surface in order to penetrate both rhombic surfaces in the direction of thickness of the cutting insert. The mounting hole does not necessarily have to be formed. A protruding surface 8 is formed on the rhombic surface with the inclined face 2 formed therein and around the opening portion of the mounting hole 9. The protruding surface 8 is a substantially flat surface slightly higher than the corner cutting edges. 5 and cutting edges 6.
    [00028] A chip-forming groove 7 is formed on the sloping face 2 at least within the corner cutting edges 5, and includes a valley L positioned at the corner cutting edges 5 and cutting edges 6. The groove forming groove 6 chip 7 includes an inclined surface, inclined so that the height of the chip-forming groove 7 gradually decreases with increasing distance from the corresponding corner cutting edge 5 and cutting edges 6. The inclined surface provides a positive exit angle. The exit angle is preferably set to greater than 0 ° and a maximum of 30 °; in this mode, the exit angle is set to 15 °.
    [00029] The valley L can be formed in the chip-forming groove 7. Valley L is formed by a tapered surface or a flat surface that extends along the cutting edges (corner cutting edges 5 and cutting edges 6 ). The L valley has a width of at least 0.02 mm and a maximum of 0.50 mm in a direction perpendicular to the cutting edges; in this modality, the L valley has a width of 0.15 mm. The L valley can be a negative valley that extends in a horizontal direction when viewed in a cross section taken orthogonally to the cutting edges, or a positive valley gently sloping downward as the distance from the cutting edges increases, or a negative valley gently tilted upward as the distance from the cutting edges increases. The angle of inclination (valley angle) of the positive valley is adjusted, for example, above 0 ° and at most 20 °; in this modality, positive valleys are formed to have an inclination angle (valley angle) of 8 °. Also for the upward-sloping negative valley, the angle of inclination can be adjusted to, for example, greater than 0 ° and a maximum of 20 °.
    [00030] As shown in figure 1 and figure 3, an elevated portion 10 is formed, which is raised upwardly from the inside of the chip-forming groove 7 formed within the pair of corner cutting edges 5, when viewed from from a direction opposite to the sloped face 2. The raised portion 10 extends along a bisector B of the pair of cutting edges 6 that extend from the corner portion and towards the corner cutting edge 5. A raised portion 10 includes a front raised surface 11, side raised surfaces 12, and transition surfaces 15, all of which rise upward from the chip-forming groove 7, and a top surface 13. the leading elevated surface 11 faces for the corner cutting edge 5. In addition, the front raised surface 11 faces a leading end of the corner cutting edge 5 defined by an intersection point between the corner cutting edge 5 and the bisector B. raised surfaces barks 12 are formed on the right and left sides of the front elevated surface 11. Each of the side elevated surfaces 12 includes a portion that extends in a direction in which a distance from the corresponding lateral cutting edges 6 increases consistently with a distance a from the corner cutting edge 5. In the present embodiment, the lateral raised surface 12 extends entirely in a direction in which the distance from the corresponding cutting edge 6 increases. Each of the transition surfaces 15 is a curved surface with a small width that is formed at the intersection between the front raised surface 11 and the corresponding surface of the raised side surfaces 12 and that is smoothly continuous with both raised surfaces 11 and 12 on the same tangent. The upper surface 13 crosses the front elevated surface 11 and the lateral elevated surfaces 12. In the present embodiment, the upper surface 13 is formed from a substantial plane that extends in the horizontal direction. In a right / left cutting insert, in which only one cutting edge 6 of the pair of side cutting edges 6 extending from the corner cutting edge 5 serves as an active cutting edge, the front raised surface 12 it can be provided exclusively on the side of the cutting edge 6 which serves to act on the front raised surface 11; this is not shown in the drawings.
    [00031] As shown in figure 3, an intersecting portion 14 between the front elevated surface 11 and the upper surface 13 of the elevated portion 10 extends linearly parallel to a direction orthogonal to the bisector B. The length W of the intersecting portion 14 is equal a, or less than, the radius of curvature (0.8 mm) of the corner cutting edge 5. In the present embodiment, the length W is approximately 0.50 mm. The width of the front elevated surface 11 can be constant regardless of a distance from the corner cutting edge 5 or it can increase or decrease depending on a distance from the corner cutting edge 5.
    [00032] In the present embodiment, the front elevated surface 11 is formed to have a width increasing progressively with the distance from the corner cutting edge 5.
    [00033] On the other hand, as illustrated in figure 4, the front elevated surface 11 is curved so that it projects upwards and towards the corner cutting edge 5 (outwards) when seen in a cross section taken along of the bisector B. The radius of curvature R1 of the front raised surface 11 is preferably at least 0.5 mm and at most 5.0 mm; In the present mode, the radius of curvature R1 is set to 2.5 mm. The front elevated surface 11 is not limited to a constant radius of curvature, but can have at least two different radii of curvature. If the front elevated surface 11 has at least two different radii of curvature, each circular arc preferably has a radius of curvature of at least 0.5 mm and at most 5.0 mm. The entire front elevated surface 11 can have a radius of curvature of at least 0.5 mm and a maximum of 5.0 mm when minimum square approximation is used for the calculation.
    [00034] As shown in figure 3, the intersecting portion 16 between the lateral elevated surface 12 and the upper surface 13 of the elevated portion 10 is inclined so that a distance from the corresponding cutting edge 6 gradually increases with a distance from of the corner cutting edge 5. In the present embodiment, the intersecting portion 16 is curved so that it protrudes in the direction of the corresponding cutting edge 6 in a direction along the cutting edge 6. Each of the raised side surfaces 12 has a curved surface shape corresponding to the intersecting portion 16 and is formed so that a distance from the corresponding cutting edge 6 gradually increases with a distance from the corner cutting edge 5. In the present embodiment, the raised surface side 12 is curved so that it projects in association with the intersecting portion 16. On the other hand, the side elevated surface 12 is curved so that it projects upwards and in the d direction of the corresponding cutting edge 6 (outward) when viewed in a cross section taken along a direction orthogonal to the bisector B, that is, a direction parallel to the straight line of the first intersecting portion. As shown in figure 5 and figure 6, the radius of curvature R3 of the curved line of the side elevated surface 12 in an end view of line 83-83 of a portion of the side elevated surface 12 that is far from the cutting edge corner 5 is large in relation to the radius of curvature R2 of the curved line of the lateral raised surface 12 in an end view of line 82-82 of a portion of the lateral raised surface 12 which is close to the corner cutting edge 5. Thus , the radius of curvature R2, R3 of the curved line of the lateral raised surface 12 in a cross section orthogonal to the bisector B preferably gradually increases with the distance from the corner cutting edge 5. The radii of curvature R2 and R3 are preferably adjusted for example, at least 0.5 mm and at most 5.0 mm.
    [00035] For the lateral elevated surface 12 when viewed in a cross section taken orthogonal to the bisector B, the difference in height D1, D2 between the uppermost position and the lowermost position of the lateral elevated surface 12 preferably increases gradually with the distance from the corner cutting edge 5. That is, as shown in figure 5 and figure 6, a distance from the upper surface 13 of the raised portion 10 to a connecting portion 7a of the chip-forming groove 7 connected to the elevated portion 10 preferably gradually increases with the distance from the corner cutting edge 5.
    [00036] If the uppermost position of the lateral raised surface 12 is constant as in the present embodiment, the height of the lowermost position of the lateral raised surface 12 gradually decreases with the distance from the corner cutting edge 5. The difference in height 02 in a cross-sectional view of line 83-83 (figure 6) of the portion of the lateral raised surface that is far from the corner cutting edge 5 is large in relation to the difference in height D1 in a sectional view cross-section of line 82-82 (figure 5) of the portion of the side elevated surface that is close to the corner cutting edge 5.
    [00037] The transition surface 15 with a small width is formed between the front elevated surface 11 and each of the side elevated surfaces 12 so as to be smoothly continuous with the two elevated surfaces 11 and 12 on the same tangent.
    [00038] The upper surface 13 of the raised portion 10 is formed from a substantially flat surface that extends at a height equal to that of the protruding surface 8. In a cutting insert that uses both opposite rhombic surfaces, for the seat face 4 , the upper surface 13, together with the projecting surface 8, come into contact with a lower surface of an insert mounting seat; this is not shown in the drawings. That is, in the present embodiment, the upper surface 13 forms a part of the projecting surface 8.
    [00039] The cutting insert described above is loaded onto a pointed seat provided in the cutting tool body; this is not shown in the drawings. The seat face 4 and at least one side surface of the loaded cutting insert come into contact with a lower surface and a wall surface of the pointed seat. Then, the cutting insert is removably fixed to the cutting tool body using a screw element that engages with the mounting hole 9. The opposite rhombic surface is selected either as the sloped face 2 or the seat face 4; this is not shown in the drawings. In a cutting insert that uses both opposing rhombic surfaces, the projecting surface 8 and the upper surface 13 come into contact with the lower surface of the insert mounting seat.
    [00040] If the cutting tool body is an alignable turning tool, the rhombic surface of the cutting insert attached to the cutting tool body, which surface serves as the slanted face 2, faces a cutting direction. In addition, a cutting edge 6 of the pair of cutting edges 6 extending from one of the corner cutting edges 5 of the inclined face 2 is one of the lateral cutting edges facing an infeed direction. The other cutting edge is an end cutting edge that faces a processed surface of a workpiece.
    [00041] The cutting insert makes an outer peripheral surface of a workpiece, fed in a direction parallel to a center line of rotation of the workpiece and rotating around the center line of rotation. In this case, the cutting edge 6 serving as the side cutting edge and a part of the corner cutting edge 5 that is adjacent to the cutting edge 6 contact the workpiece completely along the cutting depth in a direction perpendicular to the centerline of rotation (cutting direction), and are mainly responsible for cutting. A part of the corner cutting edge 5 which is adjacent to the cutting edge 6 serving as the end cutting edge contacts the processed surface of the workpiece and is responsible for forming the processed surface.
    [00042] In the cutting insert described above, chips from the lateral cutting edge flow towards the raised portion 10 while in contact with a part of the chip-forming groove surface 7. After that, the chips having left the surface of the chip-forming groove 7 comes into contact with the raised portion 10. If the cutting depth is so great that the chips are generated at the corner cutting edges 5 and cutting edges 6, the chips come into contact with a part from the surface of the chip-forming groove 7 and then with the front raised surface 11 and raised side surfaces 12 of the raised portion 10. Each of the raised side surfaces 12 is formed in the type of a projecting curved surface, inclined in such a way that the distance from the corresponding cutting edge 6 increases consistently with the distance from the corner cutting edge 5 in the direction along the cutting edge 6, and thus the distance from the cutting edge cutting edge 6 at the side elevated surface 12 increases progressively with the cutting depth. Consequently, the chips are deformed prior to brushing the entire side raised surface 12 and quickly leave the side raised surface 12. This prevents excessive contact between the side raised surface 12 and the chips. As a result, chip adhesion to the raised side surface 12 and chip scattering are suppressed. In addition, a possible increase in cut resistance is prevented.
    [00043] In addition, the side elevated surface 12 is curved to project outward when viewed in a cross section taken orthogonal to the bisector B. This shape of the side elevated surface 12 contributes, at a high feed rate, to allow that the chips quickly leave the side raised surface 12 to prevent possible excessive contact between the side raised surface 12 and the chips. The two aspects described above further suppress chip adhesion to the raised side surface 12 and chip scattering, and significantly effectively prevent a possible increase in cut resistance.
    [00044] In the case of a small depth of cut where only the corner cutting edges 5 are involved in the cut, the chips come into contact with the front elevated surface 11, which is facing the front end of the corner cutting edge 5. The front elevated surface 11, thanks to its large width, blocks the chips from the corner cutting edge 5 and reliably controls the winding of the chips. In addition, since the front elevated surface 11 is curved to project outward when viewed in a cross section taken along the above-described bisector B, even if the feed rate is increased with the small depth of cut maintained , the chips can be quickly separated from the front raised surface 11. Thus, possible excessive contact between the side raised surface 12 and the chips can be prevented. This suppresses chip adhesion to the front elevated surface 11 and chip spreading, and allows for a possible increase in cut resistance to be prevented.
    [00045] As described above, in the case of a small depth of cut where only the corner cutting edges 5 are involved in the cut, the raised front surface of the raised portion effectively improves chip processing capacity and reduces cut resistance . In semi-finishing and coarse processing at a great depth of cut where the corner cutting edge 5 and cutting edges 6 are involved in the cut, the raised side surfaces, in addition to the raised front surface, effectively improve the processing capacity cutting and reduce cut resistance. In addition, the front raised surface 11 and the raised side surfaces 12 effectively prevent chip spreading and reduce cut resistance even if the feed rate is increased. This allows for stable chip processing and a reduction in cut resistance under a wide range of cutting conditions for the depth of cut and the feed rate.
    [00046] In the raised portion 10 of the cutting insert, the length W of the intersecting portion 14 between the front raised surface 11 and the upper surface 13 is set equal to, and less than, the radius of curvature of the corner cutting edge. 5. In the present embodiment, the length W of the intersecting portion 14 is adjusted to 0.50 mm, which is equal to about 63% of the radius of curvature of the corner cutting edge 5, 0.8 mm. As the width of the front elevated surface 11 increases consistently with the length W of the intersecting portion 14, the chips are more significantly blocked. However, chips are prevented from being excessively blocked, as long as the upper limit value of the length of the intersection portion 14 is equal to the radius of curvature of the corner cutting edge 5. The lower limit value of the length W of the intersection portion intersection 14 is preferably adjusted to 0.05 mm to ensure that the chips are reliably blocked. If the length W of the intersecting portion 14 is less than 0.05 mm, the effects of the present invention cannot be exerted.
    [00047] The front elevated surface 11 according to the present embodiment is formed so as to increase in size consistently with the distance from the corner cutting edge 5. That is, the chip blocking effect increases consistently with the distance from the corner cutting edge 5, in other words, the effect increases from bottom to top of the front elevated surface 11. Thus, the front elevated surface 11 shaped as described above, insignificantly blocks thick, rigid chips that flow downward with with respect to the corner cutting edge 5 and chips that result from a low feed rate, while significantly blocking upward flowing chips with respect to the corner cutting edge 5 and chips that result from a high feed rate. Thus, the present modality can obtain chip processing that corresponds to the feeding conditions and the stretching nature of the chips.
    [00048] The difference D1, D2 in height between the uppermost position and the lowermost position of the lateral raised surface 12 gradually increases with the distance from the corresponding corner cutting edge 5, when viewed in a taken cross section orthogonally to the bisector B. In addition to this, the radius of curvature R2, R3 of the curved line protruding from the lateral raised surface 12 gradually increases with the distance from the corresponding corner cutting edge 5. Thus, chips resulting from the processing of semi-finishing and coarse, which involve a great depth of cut, can be reliably brought into contact with, and blocked by, the raised side surface 12. A possible increase in cut resistance can be prevented and appropriate and stable chip processing can be obtained, by the synergy between the effect of reliably blocking the chips and the effect of preventing the chips from the side elevated surface 12 being excessive actively blocked.
    [00049] In the present embodiment, at the intersection portion between the front elevated surface 11 and each of the side elevated surfaces 12, which are continuous with the respective ends of the front elevated surface, the transition section 15 with a small width is formed, which is smoothly continuous with both the front elevated surface 11 and the side elevated surfaces 12. Assuming that the transition surface 15 is not formed and that a corner is present at an intersection portion between the front elevated surface 11 and the side elevated surface 12, chips that contact both elevated surfaces 11 and 12 are deformed so as to be sharply curved by the intersecting portion when viewed in a cross section taken orthogonal to the direction in which the chips flow out. Thus, the curving of the chips is prevented, thus requiring extra force to deform the chips. However, the presence of the transition surface 15 solves this problem.
    [00050] In addition, the cutting edge 6 includes the inclined portion 6a, and the transition surface 15 is also formed. This stabilizes the chip's outflow direction to improve chip processing capacity.
    [00051] The cutting edge 6 according to the present embodiment includes the inclined portion 6a with a height gradually decreasing with increasing distance from the corner cutting edge 5. This reduces a main cutting force directed orthogonally to the inclined face 2 The cutting edge 6 also has the effect of passing the chip flow out from the corner cutting edge 5, depending on the inclination angle IA of the inclined portion 6a. The synergy between these effects also serves to stabilize chip processing and prevent chip spreading and an increase in cut resistance.
    [00052] The present invention is not limited to the embodiment described above. Naturally, components can be added to the modality and any of the components of the modality can be altered and removed, without escaping the spirits of the present invention. In addition, the present invention has been described in conjunction with the cutting insert for use in turning the outer periphery of a workpiece. However, the present invention can be applied to a cutting insert for use in turning the inner periphery and the end surface of the workpiece. The present invention can also be applied to a cutting insert for use in milling and drilling.
    权利要求:
    Claims (6)
    [0001]
    1. Cutting insert (1) formed from a plate-like member with an external polygonal shape, comprising: an inclined face (2) formed on at least one of the opposite surfaces of the plate-like member; a flank (3) formed on a lateral surface extended between the opposing surfaces; and a cutting edge (5) formed at an intersecting portion where the sloping face (5) and the side (3) intersect with each other, the cutting edge (5) comprising corner cutting edges (5) formed in respective corner portions of the opposite surface with the inclined face (2) formed therein and lateral cutting edges (6) formed along a pair of side edge portions extending on opposite sides of each of the corner cutting edges (5), in which a chip-forming groove (7) is formed on the opposite surface with the inclined face (2) formed therein and within the corner cutting edge (5), the chip-forming groove (7) comprises an elevated portion (10), elevated upwardly from within an chip-forming groove (7), the elevated portion (10) comprises an upper surface (13) comprising an upper portion of the elevated portion (10), a surface raised front (11) facing the cutting edge (5) of the corner and extended from the forming groove the chip (7) for the upper surface (13), and side elevated surfaces (12) arranged on opposite sides of the front elevated surface (11) and the upper surface (13) intersects both the front elevated surface (11) and each one of the side elevated surfaces (12), the front elevated surface (11) and the upper surface (13) intersect with each other in a first intersecting portion (14), a second intersecting portion (16) in which each of the raised side surfaces (12) and the upper surface (13) intersect with each other is extended from a corresponding opposite sides of the first intersecting portion (14) and comprises a portion for which a distance from the corresponding lateral cutting edge (6) increases gradually with a distance from the corner cutting edge (5), the front elevated surface (11) is curved to project outward, and the lateral elevated surfaces (12) are each curved in order to project stand out, characterized by the fact that the first intersecting portion (14) is linearly extended.
    [0002]
    2. Cutting insert (1) according to claim 1, characterized in that the corner cutting edge (5) is a round corner, and a length of the first intersecting portion (14) is at least 0, 05 mm and is set equal to, or less than, a radius of curvature of the corner cutting edge (5).
    [0003]
    Cutting insert (1) according to either of claims 1 or 2, characterized in that a connecting portion between the front raised surface (11) and each of the lateral raised surfaces (12) is curved in a way protruding towards the corresponding corner cutting edge (5).
    [0004]
    Cutting insert (1) according to any one of claims 1 to 3, characterized in that the radius of curvature of each of the lateral raised surfaces (12) gradually increases with a distance from the corresponding cutting edge corner (5) when viewed in a cross section taken parallel to a straight line from the first intersecting portion (14) and perpendicular to opposite surfaces.
    [0005]
    Cutting insert (1) according to any one of claims 1 to 4, characterized in that a difference in height between the highest position and the lowest position of each of the raised side surfaces (12) it gradually increases with a distance from the corresponding corner cutting edge (5) when viewed in a cross section taken parallel to a straight line from the first intersecting portion (14) and perpendicular to the opposite surfaces.
    [0006]
    Cutting insert (1) according to any one of claims 1 to 5, characterized in that each of the lateral cutting edges (6) comprises an inclined portion (6a) with a height gradually decreasing with a distance to from the corresponding corner cutting edge (5).
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    同族专利:
    公开号 | 公开日
    JP5024483B2|2012-09-12|
    EP2489453B1|2017-06-21|
    WO2011046045A1|2011-04-21|
    CN102548689B|2014-06-04|
    US20120177452A1|2012-07-12|
    RU2518875C2|2014-06-10|
    CA2774671A1|2011-04-21|
    IN2012DN02309A|2015-08-21|
    BR112012008834A2|2020-06-30|
    KR20120050526A|2012-05-18|
    US8545136B2|2013-10-01|
    EP2489453A4|2015-05-06|
    CN102548689A|2012-07-04|
    JPWO2011046045A1|2013-03-07|
    EP2489453A1|2012-08-22|
    RU2012114790A|2013-11-20|
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    法律状态:
    2020-07-21| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-10-20| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-03-09| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-04-13| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 10 (DEZ) ANOS CONTADOS A PARTIR DE 13/04/2021, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2009-237854|2009-10-15|
    JP2009237854|2009-10-15|
    PCT/JP2010/067460|WO2011046045A1|2009-10-15|2010-10-05|Cutting insert|
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