• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
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  • 优先权
    • 专利摘要:
    insert and cutting tool with a cutting edge. the present invention relates to a cutting insert with a cutting edge. Said cutting insert is provided with: an inclined surface (24) extending from the cutting edge (22a, 22b); a lifting wall surface (32a) which extends to form a concave portion (34) along with the inclined surface (24). the inclined surface (24) is formed to have positive inclination angles and has a first inclined surface (24a) and a second inclined surface (24b), in that order going away from the cutting edge (22a, 22b). the angle of inclination of the second inclined surface (24b) is greater than the angle of inclination of the first inclined surface.
    公开号:BR112012006490B1
    申请号:R112012006490-8
    申请日:2010-09-24
    公开日:2020-09-29
    发明作者:Tomomi Komatsuka
    申请人:Tungaloy Corporation；
    IPC主号:
    专利说明:

    Technical Field
    [001] The present invention relates to a cutting insert for mounting on a cutting tool body and a cutting tool. Fundamentals of technique
    [002] An example of a cutting insert for installation on a replaceable edge cutting tool is set out in Patent Literature 1. According to the description in Patent Literature 1, the cutting insert (chip thrown away) in Patent Literature 1 is designed to handle cutting cut fields from finished cut to light and medium cut. The cutting insert is generally shaped like a rhombic plate, and includes a lower surface serving as a seating face to be seated on a cutting tool body and an upper surface that is opposite the lower surface. A nose portion is formed in a sharp corner of an inclined face on the upper surface, and in this nose portion, a cutting edge of the nose portion connected to two straight cutting edges is formed. The nose portion protrudes from the bottom surface in a direction in which the distance from the bottom surface increases. The cutting edge of the nose portion is configured as a projecting circular arc. Thus, the positive inclination angle varies in an increasing way from an end point towards a central point of the cutting edge of the nose portion, and is the largest at the central point. In addition, a chip breaker is formed on the upper surface and is formed of an upper surface which is a plane substantially parallel to the lower surface and a raised breaker wall surface from the inclined face to the upper surface in an inclined manner. Citation List Patent Literature PTL1: Japanese Patent Open to Public Inspection No. 2000-107911 Summary of the Invention
    [003] In the cutting insert described in Patent Literature 1, the slanted face along the cutting edges positioned away from the opposite ends of the cutting edge of the nose portion has a small positive slope angle. Thus, when cutting using the cutting insert, chips generated at these cutting edges are generally thick. As a result, the chips and cutting edges become hot, and the cutting insert is increasingly worn and can have a reduced service life.
    [004] In addition, according to the description in Patent Literature 1, chips generated at the cutting edges, such as the cutting edge of the nose portion, travel over the surface of the cutting insert while sliding over the sloping face. and the nose portion sloping face, and collide against chip breaker wall surface. Consequently, particularly if the generated chips are thick, the slanted face is more likely to be worn. Therefore, such a cutting insert is problematic in terms of tool life.
    [005] The present invention was developed to solve the problems described above. An objective of the present invention is to increase the tool life.
    [006] The present invention provides a cutting insert with a cutting edge, the cutting insert including an inclined face extending along the cutting edge and shaped to have a positive positive angle of inclination, the inclined face including a first area and a second area arranged in order in a direction in which a distance from the cutting edge increases, the inclined face being formed so that a positive angle of inclination in the second area is greater than a positive angle of inclination in the first area, and an inclined wall surface extending to form a recess along the cutting edge together with an inclined face, the inclined wall surface being formed so as to be divided into two areas by an extension surface defined for extend the first area on a plane defined to be orthogonal to the cutting edge.
    [007] Furthermore, the present invention provides a cutting tool with a cutting edge, the cutting tool including an inclined face extending along the cutting edge and formed to have a positive inclination angle, the inclined face including a first area and a second area arranged in order in a direction in which a distance from the cutting edge increases, the slant face being formed so that a positive draft angle in the second area is greater than a positive draft angle in the first area, and an inclined wall surface extending to form a recess along the cutting edge together with an inclined face, the inclined wall surface being formed so as to be divided into two areas by an extension surface defined to extend the first area on a plane defined to be orthogonal to the cutting edge. Brief Description of the Drawings [figure 1] figure 1 is a plan view of a cutting insert according to a first embodiment of the present invention; [figure 2] figure 2 is a side view of the cutting insert in figure 1; [figure 3] figure 3 is a side view of the cutting insert in figure 1; [figure 4] figure 4 is a schematic cross-sectional view taken along line IV-IV in figure 1; [figure 5] figure 5 is a schematic cross-sectional view taken along line V-V in figure 1; [figure 6] figure 6 is a schematic cross-sectional view of part of a cutting insert according to a second embodiment of the present invention; and [figure 7] figure 7 is a schematic cross-sectional view of a part of a cutting insert according to a third embodiment of the present invention. Description of Modalities
    [008] The present invention will be described below based on modalities, with reference to the drawings.
    [009] As shown in figure 1 to figure 3, a cutting insert 10 according to a first embodiment of the present invention is substantially shaped like a rhombic plate. The cutting insert 10 includes two opposite end surfaces 12 and 14 and a peripheral side surface 16 extending between the two end surfaces 12 and 14. In the cutting insert 10, an axis A is defined, which extends through of the two end surfaces 12 and 14. Among the two end surfaces 12 and 14, the end surface 12 is an upper surface 18, and the other end surface 14 is a lower surface 20 and is configured to function as a face seat that goes into the abutment contact with a lower surface of an insert mounting seat provid on a tool body (not shown in the drawings) of a cutting tool, each of the two end surfaces 12 and 14, particularly the upper surface 18, which corresponds to the end surface 12, is rotationally symmetrical with respect to the A axis.
    [0010] A cutting edge 22 is formed in association with a crest portion of a sharp corner portion 18c of the upper surface 18. The cutting insert 10 includes two sharp corner portions 18c on the upper surface 18 and thus has two edges cutting edge 22. The two cutting edges 22 have substantially the same configuration and are formed to be rotationally symmetrical with respect to the A axis, as is apparent from the description above. That is, the two cutting edges 22 are indexable, and the cutting insert 10 is an indexable cutting insert. The cutting insert 10 will be described below in conjunction with either of the two cutting edges 22. The present invention does not limit the number of cutting edges formed in connection with an end surface. One or more cutting edges can be formed in connection with an end surface.
    [0011] The cutting edge 22 is formed at an intersection between the upper surface 18 and the peripheral side surface 16. The cutting edge 22 extends between an inclined face 24 on the upper surface 18 and a relief face 26 on the lateral surface peripheral 16. In this respect, as is apparent from figure 2 and figure 3, the relief face 26 substantially forms an acute angle in relation to the end surface 12, that is, the upper surface 18, and thus has an angle of positive relief. The relief angle can be adjusted to 20 ° or less. In the cutting insert 10 according to the present modality, the relief angle is set to 7o.
    [0012] In this regard, however, the relief angle of the relief face 26 can be 0 °. In this case, each of the opposite end surfaces 12 and 14 crosses the peripheral side surface 16 at right angles. Thus, in this case, both end surfaces 12 and 14 can be configured in the same way to be selectively used as the top surface 18. Each end surface of the cutting insert, both of which are usable, is rotationally symmetrical with respect to the A axis and both end surfaces of the cutting insert can be rotationally symmetrical with respect to an axis orthogonal to the A axis.
    [0013] The cutting edge 22 is formed to substantially extend in a plane orthogonal to the axis A. The cutting edge 22 includes a circular arc cutting edge 22a and linear cutting edges 22b. The circular arc cutting edge 22a is formed at the crest portion of the acute corner portion 18c of the upper surface 18. The circular arc cutting edge 22a forms a circular arc. In the present embodiment, the circular arc forming the circular arc cutting edge 22a has a radius of curvature of 0.8 mm. The linear cutting edges 22b extend so as to be continuous with the circular arc cutting edge 22a. The linear cutting edges 22b extend from the opposite ends of the circular arc cutting edge 22a. That is, each cutting edge 22 includes two linear cutting edges 22b. The circular arc cutting edge 22a and the linear cutting edges 22b form the cutting edge 22 that comes into contact with a workpiece.
    [0014] The cutting insert 10 includes a mounting hole 28 formed therein to penetrate both end surfaces 12 and 14 in a direction of thickness thereof. The central axis of the mounting hole 28 coincides with the A axis of the cutting insert 10. On the upper surface 18, protruding faces 30 are dispersed around the opening of the mounting hole 28. The protruding faces 30 are positioned higher than the edge circular arc cutting edges 22a and linear cutting edges 22b and in the same plane. That is, when a plane (hereinafter referred to as an intermediate plane) M is defined that it passes through the peripheral lateral surface 16 in order to cross the axis A at right angles and to divide the cutting insert 10 in two equal parts in the vertical direction ( see figure 2 and figure 3), the distance between each protruding face 30 and the intermediate plane M is greater than the distance between the intermediate plane M and the cutting edge 22 including the circular arc cutting edge 22a and the edges linear cutting tools 22b. All protruding faces 30 extend in a plane parallel to the intermediate plane M. For example, for positive inserts, the intermediate plane M can be defined in an intermediate position between the upper and lower surfaces.
    [0015] A raised chipbreaker portion 32 is formed on the upper surface 18 in an area within the circular arc cutting edge 22a and the linear cutting edges 22b. A surface 32a of the raised chipbreaker portion 32 which faces the cutting edge 22 partitions and forms a recess 34 on the upper surface 18 along with the sloped face 24 so that the recess 34 extends along the cutting edge 22. The recess 34 can be referred to as a chip breaker slot. In addition, the surface 32a of the raised chipbreaker portion 32 is a wall surface that rises from the lowermost portion 34a of the recess portion 34 and is henceforth referred to as an inclined wall surface. The recess 34 has a generally V-shaped cross section. The inclined face 24 and the inclined wall surface 32a extend almost entirely along the cutting edge 22 in order to provide the recess 34 in a cross section orthogonal to the edge. cutting edge 22 in any portion thereof.
    [0016] In the recess 34, a wall surface extending from the circular arc cutting edge 22a and the linear cutting edges 22b in the direction of the lowest portion of the recess 34 corresponds to the above-described sloping face 24. A inclined face 24 is an inclined surface, inclined so that it is gradually lowered downwards, that is, in order to approach the intermediate plane M with increasing distance inward from the cutting edge 22. Thus, the inclined face 24 is formed to have a positive tilt angle.
    [0017] The inclined face 24 is formed of substantially two faces. The inclined face 24 includes a first inclined face 24a and a second inclined face 24b arranged in order in a direction in which the distance from the cutting edge 22 increases in the direction orthogonal to the cutting edge 22. The first inclined face 24a is a angled face area 24, that is, a first angled face area 24. The second angled face 24b is another area of the angled face 24, i.e., a second angled face area 24.
    [0018] Here, a plane (hereinafter referred to as foreground) is defined, which extends to cross the cutting edge 22 at right angles. Here, the first plane is substantially parallel to axis A. The first plane can be defined on any portion of the cutting edge 22. in particular, among the foreground, the first plane that divides the circular arc cutting edge 22a into two equal parts overlapping a bise plane B in figure 1 and contain axis A. In any foreground, the inclined face 24 includes the first inclined face 24a and the second inclined face 24b so that the positive inclination angle of the inclined face 24 varies with increasing distance from the cutting edge 22. Here, the first inclined face 24a is continuous with the second inclined face 24. The first inclined face 24a is positioned on, and extends from, a lateral edge of the cutting edge. slanted face cut 24. The second sloped face 24b is positioned on, and extends from, a side end of the sloped wall surface of the sloped face 24.
    [0019] The inclined face 24 will be described in more detail with the schematic view in cross sections in figure 4 and figure 5, in which the positive inclination angle, that is, the inclination angle and the like is shown in an exaggerated way. Here, a plane orthogonal to the A axis (hereinafter referred to as a second plane), that is, a plane parallel to the intermediate plane M, is defined. In the present embodiment, the second plane is substantially parallel to the lower surface 20 functioning as a laying face, and can be referred to as a horizontal plane. The inclination angles of the first inclined face 24a and the second inclined face 24b with respect to the second plane can be defined as inclination angles aa and ab. The positive inclination angle ab of the second inclined face 24b is greater than the positive inclination angle aa of the first inclined face 24a. Thus, the inclined face 24 as a whole is convex so as to project towards the upper surface 18.
    [0020] As described above, the inclined face 24 is formed so that the positive inclination angle ab of the second inclined face 24b is greater than the positive inclination angle aa of the first inclined face 24a. The positive inclination angle aa of the first inclined face is desirably greater than or equal to 10 ° and less than or equal to 25 °, and more desirably greater than or equal to 18 ° and less than or equal to 22 °. In the present embodiment, the positive hollow angle of inclination of the first inclined face is adjusted by approximately 20 °. In addition, the positive inclination angle ocb of the second inclined face is desirably greater than or equal to 15 ° and less than or equal to 35 °. In the present embodiment, the positive inclination angle ocb of the second inclined face is adjusted by approximately 30 °.
    [0021] The reason for the adjustments described above is as follows. Among the two inclined faces of the inclined face 24, that is, the first and second inclined faces 24a and 24b, the first inclined face 24a dominantly affects the cut of a workpiece. A cutting insert in which the first inclined face has a positive hollow tilt angle less than 10 ° is insufficiently effective to taper chips to reduce the cut resistance regardless of the positive inclination angle ocb of the second inclined face. On the other hand, a cutting insert in which the first inclined face has a positive hollow inclination angle greater than 25 ° has a reduced cutting edge resistance regardless of the positive inclination angle ocb of the second inclined face. This leads to similar chip formation and cutting defects in, for example, carbon steel.
    [0022] In contrast, in a cutting insert where the positive inclination angle ocb of the second inclined face is less than 15 ° and where the positive hollow inclination angle of the first inclined face is within the range described above, the difference at an angle between the first inclined face and the second inclined face is small. This substantially dilutes the provision effect of the second slanted face. In addition, in a cutting insert where the positive inclination angle ocb of the second inclined face is greater than 35 ° and where the positive hollow inclination angle of the first inclined face is within the range described above, the cutting insert is insufficiently thick around the periphery of the cutting edge and can become significantly defective.
    [0023] In addition, a horizontal distance Wa from the cutting edge 22 to a terminal of the first inclined face 24a, that is, the lateral end of the inclined wall surface 24c, is less than the radius of curvature of the cutting edge circular arc 22a provided in the corner portion 18c. As shown in figure 4 and figure 5, the distance Wa is defined in a direction orthogonal to the cutting edge 22 when viewed from the end surface side and the A axis. Specifically, the distance Wa is desirably greater than or equal at 0.05 mm and less than or equal to 0.30 mm, and more preferably greater than or equal to 0.05 mm and less than or equal to 0.20 mm. In the present embodiment, the distance Wa is adjusted to approximately 0.12 mm fully along the cutting edge 22. However, the distance Wa does not need to be constant. That is, the distance Wa can have the value described above near the corner portion, while it is adjusted to any value in other areas.
    [0024] Furthermore, like the distance Wa, a horizontal distance Wb from the cutting edge 22 to a terminal of the second inclined face 46, that is, the lateral end of the inclined wall surface 24d, is defined in one direction orthogonal to the cutting edge 22 when viewed from the end surface side and the A axis, as shown in figure 4 and figure 5. The distance Wb is desirably greater than or equal to 0.20 mm and less than or equal to 0.70 mm and, in the present mode, it is adjusted to approximately 0.4 mm.
    [0025] In figure 1, where the cutting insert 10 is seen in a direction opposite to the upper surface 18, the raised chipbreaker portion 32 is formed within the pair of circular arc cutting edges 22a. The inclined wall surface 32a of the raised chipbreaker portion 32 extends to form the recess 34 in the upper surface 18 together with the inclined face 24. The inclined wall surface 32a is a rising surface, which rises from from the lowermost portion 34a of the recess 34, and extends so that it is gradually raised upwards with increasing distance from the inclined face 24 so that the elevation begins at a joint 32b for the lowermost portion 34a of the recess 34 Here, the inclined wall surface 32a is a flat surface and is inclined so that the distance from the intermediate plane M increases consistently with increasing distance from the circular arc cutting edge 22a and the linear cutting edges 22b.
    [0026] The raised chipbreaker portion 32 includes, in addition to the inclined wall surface 32a, an upper surface 32c that connects with the inclined wall surface 32a and extends substantially parallel to the intermediate plane M. The upper surface 32c it is a substantially flat surface. The upper surface 32c is formed higher than the cutting edge 22. This means that when such a plane when it crosses axis A at right angles and passes through the cutting edge 22 is defined, the plane extends so as to cross the inclined wall surface 32a.
    [0027] The inclination angle β of the inclined wall surface 32a to the second plane, that is, the horizontal plane, is greater than the positive inclination angle ocb of the second inclined face 24b. The inclination angle β is desirably set to be greater than or equal to 30 ° and less than or equal to 60 °. In the present mode, the inclination angle β is adjusted to approximately 45 °. At an inclination angle β less than 30 °, the raised chipbreaker portion 32 has difficulty in subjecting the chips to the desired curl deformation, resulting in excessively thick chips. At an inclination angle β greater than 60 °, the chip collides excessively violently against the chip breaker, possibly increasing the cut resistance. Consequently, in this case, vibration is likely to occur, and thick chips are likely to be generated.
    [0028] The inclined wall surface 32a is formed in association with the inclined face 24 so that an extension surface S1 or an extension line LI defined to extend the first inclined face 24a, that is, the first area, crosses the inclined wall surface 32a and divides surface 32a into two areas, in a plane defined to cross the cutting edge 22 at right angles, that is, in a cross section crossed by the cutting edge 22 at right angles. With this relationship maintained, in this case, the sloped wall surface 32a connects with a lower slit surface, that is, a lower surface recess, extending in the lowermost portion 34a of the recess 34, which corresponds to the slit chip breaker. In the recess 34, the lower slot surface is positioned closer to the intermediate plane M. As shown in figure 4 and figure 5, the lower slot surface extends between the inclined face 24 and the inclined wall surface 32a. Thus, As shown in figure 4 and figure 5, an ascending portion, that is, the joint 32b, in which the inclined wall surface 32a begins to be raised from the lower slit surface, is lower than the extension surface SI or extension line LI of the first sloping face 24a, that is, closer to the intermediate plane M (closer to the seating face) than the extension surface SI or the extension line Ll, and higher than one extension surface S2 or an extension line L2 of the second inclined face 24b, that is, further away from the intermediate plane M (closer to the upper surface 12) than the extension surface S2 or the extension line L2.
    [0029] Furthermore, like the distances Wa and Wb, a horizontal distance Wc from the cutting edge 22, an ascending portion of the sloping wall surface 32a is defined in a direction orthogonal to the cutting edge 22 when viewed from from the end surface side and to the A axis, as shown in figure 4 and figure 5. The distance Wc is desirably greater than or equal to 0.70 mm and less than or equal to 1.50 mm and, in the present embodiment , is adjusted within this range.
    [0030] In the cutting insert 10 according to the present embodiment, the inclined wall surface 32a is raised from the bottom slit surface, which is substantially horizontal and smaller in width and extending inwardly from the terminal 24d of the slanted second face 24b. The bottom slot surface can be omitted. In this case, the inclined wall surface 32a is continuous with the second inclined face 24b so as to be raised directly from the terminal 24d of the second inclined face 24b. Consequently, in this case, the joint 32b, the rising portion of the inclined wall surface 32a, lies on the extension surface S2 which is defined by extending the second inclined face 24b.
    [0031] Furthermore, the upper surface 32c of the raised chipbreaker portion 32 extends at the same level as that of the above protruding faces 30 and is configured as a substantially flat surface. This configuration is particularly effective if the cutting edges 22 are formed on both end surfaces 12 and 14. In a cutting insert in which any of the opposite end surfaces 12 and 14 is selectively used as the above-described top surface 18 , the other end surface serves as the bottom surface. In this case, the top surface of the chip breaker and the raised faces on the other end surface can act as a seating face that goes into the abutment contact with the bottom surface of the insert mounting seat provided in a tool body. cut.
    [0032] The above-described cutting insert 10 is removably mounted on the insert mounting seat provided in a cutting tool body, although this is not shown in the drawings. The cutting insert 10 is mounted on the insert mounting seat so that the bottom surface 20 functions as a seating face and at least a part of the peripheral side surface 16 is in contact with the bottom surface and a surface of insert mounting seat wall relatively. A threaded hole is formed in the insert mounting seat. The cutting insert 10 is removably attached to a cutting tool body by tightening a screw that engages with, or passes through, the mounting hole 28 in the cutting insert, into the threaded hole in the insert mounting seat. . A mounting mechanism or means for mounting the cutting insert 10 on a cutting tool body is not limited to the configuration described above. Any other mechanical or chemical mechanism or means may be adopted as an assembly mechanism or means.
    [0033] In a double-sided cutting insert where any of the opposite end surfaces can be selectively used as the top surface, as described above, the protruding faces and the top surface of the chip breaker on an end surface can be placed in contact with the bottom surface of the insert mounting seat.
    [0034] With the cutting insert 10 mounted on a cutting tool body, the upper surface 18 is adjusted in a cutting direction during cutting processing. At this point, at a wearable cutting edge 22 'on the upper surface 18, one of the linear cutting edges 22b and a part of the circular arc cutting edge 22a adjacent to the linear cutting edge 22b functions as a lateral cutting edge which is facing an alignment direction side. In contrast, during cutting processing, at the usable cutting edge 22 ', the other linear cutting edge 22b and the remaining part of the circular arc cutting edge 22a adjacent to the other linear cutting edge 22b that does not function as the edge side cutting edge acts as the cutting edge end that faces a machined surface of the workpiece. The usable cutting edge is a part of the cutting edges 22 included in the cutting tool with the cutting insert 10 mounted on it, which part cuts a work piece, i.e., the cutting edge involved in cutting 4.
    [0035] The cutting insert 10 is used to rotate an outer peripheral surface of the workpiece, rotating around the center line of rotation of the same, by feeding the cutting insert 10, for example, parallel to the central line of rotation of the workpiece. In this case, the lateral cutting edge can fully contact the workpiece in a direction normal to the center line of rotation (cutting direction) and be mainly involved in the cut. In this case, the end cutting edge can contact the machined surface of the workpiece and be involved in forming the machined surface.
    [0036] In the cutting processing described above, chips which are mainly straight on the side cutting edge of the cutting insert 10 flow from the side cutting edge towards the sloped wall surface 32a. At this point, the chips pass over the first inclined face 24a while contacting a surface of the first inclined face 24a.
    [0037] In the cutting insert according to the present modality, the distance Wa is small and thus the first sloping face 24a is narrow. Consequently, for the entire inclined face, involved in chip generation, the magnitude of the positive inclination angle is significantly affected mainly by the positive inclination angle of the second inclined face 24b. Thus, the cutting insert according to the present modality allows a reduction in cut resistance and chip thickness.
    [0038] Furthermore, since the positive inclination angle of the second inclined face is evidently greater than the positive inclination angle of the first inclined face as described above, chips can be discarded without coming into contact with the second inclined face 24b. In this case, such an inclined face configuration also contributes to the reduction of the cut resistance. Thus, the cutting insert and chips can be prevented from generating heat. Additionally, in this case, the contact area in which the chips contact the cutting insert is narrow, allowing heat generated in the chips to be prevented from spreading to the cutting insert. Therefore, an increase in the surface temperature of the cutting insert can be suppressed.
    [0039] A simple increase in the positive inclination angle of the inclined face generally results in a decrease in the cutting edge strength. In contrast, in the cutting insert 10, the first inclined face 24a is small in size (the length from the cutting edge), and the second inclined face 24b with a greater positive inclination angle is formed adjacent to the first inclined face 24a , as described above. Thus, the positive inclination angle of the inclined face 24 as a whole can be adjusted to a large value, with a decrease in the cutting edge resistance minimized.
    [0040] Chips passing over the first inclined face 24a flow over the second inclined face 24b. The positive tilt angle ocb of the second inclined face 24b is greater than the positive hollow tilt angle of the first inclined face 24a. That is, the inclined face 24 has a convex shape. Thus, chips flowing from the first inclined face 24a to the second inclined face 24b fail to come into positive or substantial contact with the surface of the second inclined face 24b. This suppresses an increase in chip temperature and significantly restricts the abrasion resistance between the chips and the slanted face. Consequently, the tool life of the cutting insert can be increased.
    [0041] However, if a ductile workpiece is cut, chips are easily stretched and elastically deformed and can thus come into contact with the surface of the second inclined face 24b. however, even in such a case, since the positive inclination angle ocb of the second inclined face is adjusted to a large positive angle of at least 15 ° and at most 35 °, chips can be broken before their thickness increases. This suppresses an increase in chip temperatures, the circular arc cutting edge 22a, the linear cutting edges 22b, the second inclined face 24b, and the relief face 26, which is caused by the contact between the chips and the second face sloping 24b. In addition, the abrasion resistance applied to the second inclined face 24b is effectively restricted. Consequently, the service life of the cutting insert is increased.
    [0042] Furthermore, as described above, the distance Wa from the cutting edge to the end of the first sloping face is less than the radius of curvature of the circular arc cutting edge 22a provided in the corner portion 18c. Since the horizontal distance Wa from the cutting edge to the end of the first inclined face is adjusted to such a magnitude, the distance Wa is prevented from being excessive with respect to the radius of curvature of the circular arc cutting edge 22a, which affects a feed rate f (mm / rev.). Therefore, the cutting insert 10 allows cutting at a high feed rate. Particularly desirably, the distance Wa from the cutting edge to the end of the first inclined face is greater than or equal to 0.05 mm and less than or equal to 0.30 mm.
    [0043] This adjustment is made with the feed rate f (mm / rev.) Adjusted in a condition for cutting processing using such a cutting insert as described above. When the distance Wa from the cutting edge to the end of the first inclined face is adjusted within this range, an increase in chip thickness is suppressed, which is caused by the contact between the chips and the first inclined face 24a. This suppresses an increase in chip temperatures, the circular arc cutting edge 22a, the linear cutting edges 22b, the first sloping face 24a, and the relief face 26, and in addition, the abrasion resistance applied to the first face slope 24a is effectively constrained. This facilitates spontaneous curly chip deformation. As a result, tool life is further increased.
    [0044] Additionally, as described above, with respect to the second inclined face 24b, the distance Wb from the cutting edge to the terminal of the second inclined face 24b is adjusted to be greater than or equal to 0.20 mm and less than or equal to 0.70 mm. Thus, chips are prevented from coming into contact with the surface of the second inclined face 46 when cutting a workpiece involving generation of chips that are easily stretched. This allows the suppression of an increase in the temperature of the chips and the components described above and in the resistance to abrasion applied to the second inclined face 24b.
    [0045] In addition, in order to avoid contact between chips and the second inclined face 24b, the difference between the positive inclination angle ocb of the second inclined face and the positive hollow inclination angle of the first inclined face is desirably increased. However, an excessive positive slope angle ocb of the second slanted face can reduce the cutting edge resistance. Thus, the positive inclination angle ocb of the second inclined face is adjusted to be greater than or equal to 15 ° and less than or equal to 35 °.
    [0046] In a direction or cross-section orthogonal to the cutting edge, the rising portion 32b of the sloping wall surface 32a may be lower than the extension surface SI which is defined by extending the first inclined face and situated at the , or higher than, the extension surface S2 which is defined by extending the second inclined face. Thus, chips flowing substantially along the first inclined face or passing substantially along the second inclined face come into positive contact with the inclined wall surface 32a. The contact quickly changes the direction of the chip flow, and the chips are thus subject to curl deformation to a curved or broken shape. This leads to stable chip disposal.
    [0047] Furthermore, since the inclination angle β of the inclined wall surface 32a is greater than the positive inclination angle ocb of the second inclined face, chips contacting the inclined wall surface 32a are significantly deformed. Thus, the chips can be reliably subjected to curl deformation or broken.
    [0048] In addition, since the tilt angle β is greater than the positive tilt angle ocb, chips can be allowed to quickly leave the inclined wall surface 32a, reducing abrasion resistance.
    [0049] Additionally, the highest part of the sloped wall surface 32a is higher than the circular arc cutting edge 22a and the linear cutting edges 22b. Thus, chips that extend upwards with respect to the first inclined face 24a or spontaneously subject to curl deformation can be reliably brought into contact with the inclined wall surface 32a. This serves to improve chip disposal.
    [0050] In addition, the distance Wc from the cutting edge to the rising portion of the inclined wall surface is adjusted to be greater than or equal to 0.70 mm and less than or equal to 1.50 mm. This is to allow chips to spontaneously undergo curl deformation to be placed reliably in contact with the inclined wall surface. The above-described adjustment is also to suppress an increase in cut resistance resulting from the excessively violent collision of stretched chips against the inclined wall surface when the chips come into contact with the inclined wall surface. The adjustment described above is also to allow the chips to be smoothly subjected to curl deformation or cut.
    [0051] Now, a cutting insert 110 according to a second embodiment of the present invention will be described. However, only the main differences between cutting insert 110 and cutting insert 10 according to the first embodiment described above will be described below. Components of the cutting insert 110 corresponding to the components already described are denoted by corresponding reference numbers or with the same reference numbers, and will not be described below.
    [0052] Compared to the above-described cutting insert 10, cutting insert 110 is characterized by the fact that an inclined wall surface 132a includes two surfaces. The configuration of the inclined wall surface 132a is generally similar to that of the inclined face 24 and the inclined face 124. Figure 6 is a cross-sectional view of the cutting insert 110 corresponding to the cross-sectional view of the cutting insert 10 in figure 4 .
    [0053] The inclined wall surface 132a is formed of substantially two surfaces. Here, such planes that are orthogonal to a cutting edge 122, i.e., the first plane described above, are defined. Here, the first plane is substantially parallel to the A axis as described above. In any foreground, the inclined wall surface 132a includes two surfaces 132d and 132e so that the angle of inclination of the inclined wall surface 132a varies with increasing distance from the cutting edge 122. The first inclined wall surface 132d and the second inclined wall surface 132e are arranged in order in a direction in which the distance from the cutting edge 122 increases. The first inclined wall surface 132d is an area of the inclined wall surface 132a, that is, a first inclined wall surface area. The second inclined wall surface 132e is another area of the inclined wall surface 132a, i.e., a second inclined wall surface area. Here, the first inclined wall surface 132d is continuous with the second inclined wall surface 132e. The first inclined wall surface 132d is positioned at, and extends from, a cutting edge side edge of the inclined wall surface 132a. The second inclined wall surface 132e is positioned on, and extends from, a lateral upper surface end 132c of the inclined wall surface.
    [0054] The inclination angle βa of the first inclined wall surface 132d to a second plane, that is, a horizontal plane, is greater than the inclination angle βb of the second inclined wall surface 154d to the second plane. Thus, the inclined wall surface 132a as a whole is convex in shape towards an upper face 118.
    [0055] Like the above-described upper surface 32c, the upper surface 132c of the raised chipbreaker portion 132 is formed higher than the cutting edge 122. In addition, a boundary portion or an intersection 132f between the first surface of the chip inclined wall 132d and the second inclined wall surface 132e is formed higher than the cutting edge 122, that is, further from the intermediate plane M than the cutting edge 122, as shown in figure 6. Thus, when a such a plane that crosses axis A at right angles and passes through the cutting edge 122 is defined, the plane extends so as to cross the first inclined wall surface 13 2d.
    [0056] The cutting insert 110 configured as described above has, in addition to the above described advantageous functions and effects of the cutting insert 10, the following advantageous functions and effects.
    [0057] The inclined wall surface 132a includes the first inclined wall surface 13 2d and the second inclined wall surface 132e, and the inclination angle βa of the first inclined wall surface 132d is greater than the inclination angle βb of the second inclined wall surface 132e. Thus, the second inclined wall surface 132e is significantly inclined in a direction in which the distance from a circular arc cutting edge 122a and linear cutting edges 122b increases with respect to the first inclined wall surface 132d. The inclined wall surface 132a as a whole is convex in shape. Consequently, when chips contacting the first sloping wall surface 132d are subject to curl deformation and flow upward in the direction that the distance from the circular arc cutting edge 122a and the linear cutting edges 122b increases, the chips are prevented to come into contact with the second inclined wall surface 132e. This minimizes the contact area where the sloped wall surface 132a contacts the chips to allow the chips to be smoothly discharged. Consequently, proper chip disposal can be obtained. That is, the angle of inclination of the second inclined wall surface is different from that of the first inclined wall surface in order to promote chip discharge.
    [0058] Furthermore, the intersection 132f between the first inclined wall surface 132d and the second inclined wall surface 132e is higher than the circular arc cutting edge 122a and the linear cutting edges 122b. Thus, chips passing along a first inclined face 124a or a second inclined face 124b can be reliably received by the first inclined wall surface 132d. In addition, chips subject to curl deformation upon contact with the first inclined wall surface 132d can be smoothly discharged without coming into contact with the second inclined wall surface 132e.
    [0059] Now, a cutting insert 210 according to a third embodiment of the present invention will be described. However, only the main differences between cutting insert 210 and both cutting inserts 10 and 110 according to the first and second modalities described above will be described below, components of cutting insert 210 corresponding to the components already described are denoted by correspondents reference numbers or by the same reference numbers and will not be described below.
    [0060] Compared to the above-described cutting insert 10, cutting insert 210 is characterized by the fact that an inclined wall surface 232a includes two areas, specifically, two surfaces 232d and 232e. In comparison to the above-described cutting inserts 10 and 110, the cutting insert 210 is characterized by the fact that an inclined face 224 and the inclined wall surface 232a are each curved. That is, a first inclined face 224a, a second inclined face 224b, the first inclined wall surface 232d, and the second inclined wall surface 232e are each curved. Figure 7 is a cross-sectional view of the cutting insert 210 corresponding to the cross-sectional view of the cutting insert 10 in Figure 4.
    [0061] In this case, the positive inclination angle or inclination angle of each of the first and second inclined faces and the inclination angle of each of the first and second upward wall surfaces are defined in association with a virtual line or a virtual surface. In the cross-sectional view in Figure 7, the first inclined face 224a, the second inclined face 224b, the first inclined wall surface 232d, and the second inclined wall surface 232e are each configured as a curve projecting towards the side of the upper surface 18. Then, each positive angle of inclination or angle of inclination is defined by the angle between a second plane or a horizontal plane and a straight line or plane (double dash line in figure 7) joining one end of the surface ( for example, one side edge of the cutting edge or one end closer to a cutting edge 222) to the other end (for example, an end of the upper surface side 232c of a raised chipbreaker portion 232 or an end further away from the cutting edge 222). Specifically, the positive inclination angle of the first inclined face 224a is defined by the angle between the horizontal plane and a LI line or an SI surface joining a cutting edge (front end) lateral end of the first inclined face 224a, for example, the portion of the first sloping face 224 corresponding to the circular arc cutting edge 222a, up to a side end of the upper surface (rear end) 224c. In addition, the positive inclination angle of the second inclined face 224b is defined by the angle between the horizontal plane and a line L2 or a surface S2 joining a front end 224c to a rear end 224d of the second inclined face.
    [0062] The cutting insert 210 configured as described above has the same advantageous effects and functions as those produced by the above described cutting inserts 10 and 110.
    [0063] At least one of the first inclined face, the second inclined face, the first inclined wall surface, and the second inclined wall surface can be flat or curved. In addition, if any of these surfaces are curved, this surface is not limited to a shape that projects upwards like the cutting insert 210, but can be projected downwards, that is, towards the lower surface.
    [0064] As described above, in the cutting inserts according to the modalities of the present invention, the inclined face has a positive inclination angle entirely along the cutting edge. Thus, chips can be reduced in thickness. In particular, the cutting inserts include the first inclined face and the second inclined face arranged in order in the direction in which the distance from the cutting edge increases, as described above. The inclination angles of the inclined faces increase in a step-by-step manner consistently with the distance from the cutting edge. Consequently, the present invention has the advantageous effects and functions of promoting chip flow and reducing chip thickness. This suppresses an increase in the temperatures of the cutting edge, the first and second angled faces, and the relief face to allow the tool life of the cutting insert to be increased.
    [0065] Furthermore, since the present invention has the effect of reducing the chip thickness, there is a marked difference in temperature between a sheared surface side (the side facing the inclined face) and the opposite side of the chips in the direction of thickness direction of the same. Thus, the difference in temperature pushes the chips to undergo curling deformation, allowing the chips to be more appropriately discarded. In addition, the reduced chip thickness serves to suppress the progressive wear of the chip breaker, resulting from contact with the chips. This allows the chip breaker's sloping wall surface to stably discard the chips over a long time.
    [0066] In addition, since the positive inclination angle (inclination angle) of the second inclined face to the horizontal plane is greater than the positive inclination angle (inclination angle) of the first inclined face, chips that passed over the the first inclined face preferably moves on the second inclined face without coming into contact with the surface of the second inclined face. Thus, the chips, the cutting edge, the first slanted face, and the relief face can be effectively prevented if they become hot. This allows the tool life to be further extended.
    [0067] Cutting inserts according to the modalities of the present invention have been described, however, several modifications can be applied to the modalities. The shape of the top surface of the cutting insert or the like is not limited to rhombic, but can be changed to a substantial polygon, such as a square, rectangle, parallelogram, or triangle. That is, the cutting insert can be configured as a substantially polygonal plate. In addition, the cutting insert can be manufactured using any of several materials. At least part of the circular arc cutting edge and the linear cutting edge can be formed of a hard material, such as cemented carbide, coated cemented carbide, cermet, or ceramic, or a compact, sintered with an extra high pressure, such such as sintered diamond or sintered cubic boron nitride.
    [0068] The cutting inserts 10, 110, and 210 according to the modalities described above are cutting inserts to turn the outer periphery of a workpiece, however, the present invention is applicable to cutting inserts configured to turn the inner periphery or end surface of a workpiece. In addition, the present invention is applicable to cutting inserts for use in milling and drilling.
    [0069] Additionally, cutting inserts according to the modalities of the present invention have been described. However, the present invention is applicable to cutting tools other than cutting inserts. The present invention also relates to a cutting tool including an edge portion with the characteristics of the cutting insert described above. Such a cutting tool may include a tip or an edge portion integrally mounted thereon and may have the angled face and angled wall surface, described above, formed along a cutting edge of the edge portion.
    [0070] In the modalities described above, the inclined face includes two areas (particular band), however, the inclined surface can include three or more areas. One area adjacent to the cutting edge can be a first area, as mentioned above, and the other areas can be a second area, a third area, and so on. In addition, the sloped wall surface is also not limited to one or two areas, but can similarly include three or more areas. These areas desirably include boundary portions or joints defined between their areas, but the present invention is not limited to defined portions or boundary joints. In addition, each area of the sloping face is not limited to a flat shape or a simple curved shape, but can have any of several shapes, for example, a shape with very small undercuts and projections or a corrugated shape. This also applies to each area of the sloped wall surface.
    [0071] In the modalities described above, the cutting edge is formed to extend substantially in a plane orthogonal to the A axis, however, the cutting edge can extend in such a way as to cross the plane. In this case, a part of the cutting edge positioned further away from the intermediate plane M can be referred to as the highest point of the cutting edge. For example, when a relationship between the cutting edge and the sloped wall surface is adjusted, the highest point of the cutting edge can be defined as a reference for the cutting edge.
    [0072] In the above described modalities and their variations, the present invention has been described somewhat specifically, however, the present invention is not limited to the modalities and their variations. It should be appreciated that, with respect to the present invention, various changes and modifications can be made to the modalities and variations thereof without departing from the spirits and scope of the invention mentioned in the claims. That is, the present invention includes any variations, applications, and equivalents involved by the concepts of the present invention defined by the claims.
    权利要求:
    Claims (4)
    [0001]
    1. Cutting insert (10, 110) with a cutting edge (22a, 22b, 122a, 122b), comprising: two opposite end surfaces (12, 14), a peripheral side surface (16, 116) extending between the two end surfaces (12, 14), and a cutting edge (22, 122) formed at an intersection between an end surface (12) of the two end surfaces (12, 14) and the peripheral side surface ( 16, 116), where an end surface (12) is rotationally symmetrical about an axis (A) defined to extend through the two end surfaces (12, 14), the end surface (12) is a horizontal plane orthogonal to the axis (A) that defines a top surface (132c), the cutting insert characterized by the fact that it also comprises: an inclined face (24, 124) extending along the cutting edge (22a, 22b , 122) and formed to have a positive inclination angle, the inclined face (24, 124) comprising a first area (2 4a, 124a) and a second area (24b, 124b) arranged in order in a direction in which a distance from the cutting edge (22a, 122a) increases, the sloping face (24, 124) being formed so that a tilt angle (ab) in the second area (24b, 124b) is greater than a tilt angle (aa) in the first area (24a, 124a); and an inclined wall surface (32a, 132a), on an end surface (12), extending to form a recess (34, 134a) along the cutting edge (22a, 122a) together with an inclined face (24, 124), the inclined wall surface (32a, 132a) being formed so as to be divided into two surfaces, a first inclined wall surface (132d) and a second inclined wall surface (132e) arranged in one direction in which a distance from the cutting edge (122a) increases, the second inclined wall surface (132e) is continuous with the first inclined wall surface (132d) and positioned on and extending from the top surface (132c) ); angle of inclination (βa) of the first inclined wall surface (132d) on the top surface (132c) is greater than the inclination angle (βb) of the second inclined wall surface (132e) on the top surface (132c), in so that the inclined wall surface (132a) as a whole has a convex shape towards the top surface (132c).
    [0002]
    2. Cutting insert according to claim 1, characterized by the fact that, in a direction orthogonal to the cutting edge (22, 122), when viewed from the end surface side, and to the axis (A), a distance from the cutting edge (22, 122) to an end of the first inclined face (24a, 124a) that is closest to the inclined wall surface (32a, 132a) is greater than or equal to 0.05 mm and less than or equal to 0.20 mm, and an angle of inclination (aa) of the first face inclined in relation to a plane orthogonal to the axis is greater than or equal to 10 ° and less than or equal to 25 °.
    [0003]
    3. Cutting insert according to claim 1 or 2, characterized by the fact that, in the direction orthogonal to the cutting edge (22, 122) when viewed from the end surface side and the axis (A), a distance from the cutting edge to an end of the second inclined face (24b, 124b) which is closer to the inclined wall surface (32a, 132a) is greater than or equal to 0.20 mm and less than or equal to 0, 70 mm, and an angle of inclination (ab) of the second face inclined with respect to a plane orthogonal to the axis is greater than or equal to 15 ° and less than or equal to 35 °.
    [0004]
    Cutting insert according to any of claims 1 to 3, characterized in that, in the direction orthogonal to the cutting edge (22, 122) when viewed from the end surface side and the axis, a distance from the cutting edge (22, 122) for a cutting edge side edge of the sloping wall surface is greater than or equal to 0.70 mm and less than or equal to 1.50 mm, and an angle of inclination (βa, βb) the wall surface inclined in relation to a plane orthogonal to the axis is greater than or equal to 30 ° and less than or equal to 60 °.
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    同族专利:
    公开号 | 公开日
    CN102753291B|2015-08-05|
    EP2481504A4|2014-09-17|
    US8690496B2|2014-04-08|
    IN2012DN02141A|2015-08-21|
    RU2012111269A|2013-10-27|
    RU2501632C2|2013-12-20|
    CN102753291A|2012-10-24|
    BR112012006490A2|2016-04-26|
    EP2481504A1|2012-08-01|
    CA2773974A1|2011-03-31|
    US20120170987A1|2012-07-05|
    KR20120050483A|2012-05-18|
    JPWO2011037186A1|2013-02-21|
    WO2011037186A1|2011-03-31|
    EP2481504B1|2019-07-24|
    JP5187447B2|2013-04-24|
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    法律状态:
    2019-01-08| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-08-27| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-04-07| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|
    2020-07-14| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-09-29| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 10 (DEZ) ANOS CONTADOS A PARTIR DE 29/09/2020, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2009-220451|2009-09-25|
    JP2009220451|2009-09-25|
    PCT/JP2010/066552|WO2011037186A1|2009-09-25|2010-09-24|Cutting insert and cutting tool|
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