• 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. A cutting insert is provided which has improved chip processing performance during cutting work and improved defect resistance performance. A cutting insert having a substantially polygonal plate shape, in which a cutting edge (6) is formed in a section of crest line intersecting between a cutting surface (2a) and a flank surface (4a), and a chip breaking device is formed on the cutting surface (2a), where a concave chip breaking device (40) of a front section has an attack surface (40b), and the attack surface (40b ) curves in a concave shape from the peripheral section next to the front section (5) to a bottom surface section (40c), gradually leaning towards the bottom surface section (40c), and connecting smoothly to the bottom surface section (40c).
    公开号:BR112012027776B1
    申请号:R112012027776-6
    申请日:2011-05-06
    公开日:2020-06-23
    发明作者:Shinya MAJIMA
    申请人:Tungaloy Corporation；
    IPC主号:
    专利说明:

    Technical Field
    The present invention relates to a cutting insert used for cutting processing a metal material being detachably attached to a tool body. Fundamentals of Technique
    A cutting insert described in Patent Literature 1 has an approximately polygonal plate shape, in which a projection of a breaking device having an upright wall surface extending upwards from an attack face in at least one of its faces. protruding portions and also protruding towards an end point this protruding portion is formed, and the attack face connected at least to all or part of a circumference of the upright wall surface is constituted by a first face of attack extending inwards from a cutting edge and a second attack face extending inwards continuously from this first attack face and continuing to the upright wall surface. Citation List Patent Literature
    Patent Literature 1: Japanese Patent Deposited No. 2007-175788 Summary of the Invention Technical problem
    Two-stage tilt angles, that is, a first tilt angle and a second tilt angle are formed on the projecting portion of the cutting insert of Patent Literature 1, and as a result, a hollow is formed on the projecting portion of a device of chip breaking. Therefore, the cutting insert from Patent Literature 1 is excellent in crack and heat resistance and is designed to be able to apply a tool material that is poor in crack and heat resistance such as cermet, for light cutting including the so-called finishing cut, in which a cut amount and a feed amount are both small. However, the cutting insert in Patent Literature 1 effectively works from finishing to light cutting, there are many cases where the cutting insert does not work effectively in a heavy cutting condition. Therefore, the cutting insert of Patent Literature 1 cannot handle light cutting conditions for heavy cutting with a cutting insert.
    The present invention was made in order to solve the problems described above. That is, the present invention aims to provide a cutting insert that can effectively handle light cutting conditions for heavy cutting, with a cutting insert. Solution to the Problem
    uma face de ataque com um dispositivo de quebra de aparas que é formado em pelo menos uma de superfícies de topo e fundo; um flanco formado na superfície de periferia externa se estendendo entre as superfícies de topo e fundo; e uma borda de corte formada na porção de interseção entre a face de ataque e ou flanco, a borda de corte compreendendo uma borda de corte em forma de arco em uma forma de arco e localizada em pelo menos uma das porções salientes, uma borda de corte de trabalho se estendendo a partir de um lado da borda de corte em forma de arco, e uma borda de corte linear se estendendo a partir do outro lado da borda de corte em forma de arco, em que uma porção côncava de dispositivo de quebra de apara é formada na vizinhança da borda de corte em forma de arco na face de ataque; uma projeção de dispositivo de quebra se levanta a partir de uma porção de superfície de fundo da porção côncava de dispositivo de quebra de apara; e a porção côncava de dispositivo de quebra de apara é definida por uma superfície inclinada que é curvada de uma maneira côncava e que é conectada de maneira suave à porção de superfície de fundo enquanto é gradualmente inclinada em direção a porção de superfície de fundo, a partir de uma porção de borda periférica no lado da porção saliente para a porção de superfície de fundo. A cutting insert according to the present invention is formed from a plate-like member with a substantially polygonal external shape and including: an attack face with a chip breaking device that is formed on at least one of top and bottom surfaces; a flank formed on the outer periphery surface extending between the top and bottom surfaces; and a cutting edge formed at the intersection portion between the leading face and or flank, the cutting edge comprising an arc shaped cutting edge in an arc shape and located in at least one of the projecting portions, a cutting edge working area extending from one side of the arc-shaped cutting edge, and a linear cutting edge extending from the other side of the arc-shaped cutting edge, where a concave portion of chip breaking device is formed in the vicinity of the arc-shaped cutting edge on the leading face; a projection of the breaking device rises from a bottom surface portion of the concave portion of chip breaking device; and the concave chip breaker portion is defined by an inclined surface that is concavely curved and that is smoothly connected to the bottom surface portion while gradually sloping towards the bottom surface portion, starting from from a peripheral edge portion on the side of the projecting portion to the bottom surface portion.
    Advantageous Effects of the Invention
    The cutting insert of the present invention improves chip processing performance not only when used in heavy cutting, but also when used under a milder cutting condition, and furthermore, abnormal damage such as a defect do not occur. One factor by which the concave portion of chip breaking device can improve chip processing performance on the light cutting side is a difference in the height of the chip breaking device generated with respect to correspondence with a depth of a device groove chip breaking. In a light cutting side cutting condition in which the greater the difference in the height of the chip breaking device, the stronger the restraining force will be when chips collide with each other and the chip outlet flow becomes easily unstable, chips can be made stable and the chip processing performance can be improved. Therefore, an application range based on a form of chip breaking device for heavy cutting can be expanded to the light cutting side. When used on the light cutting side, mainly the concave portion of the chip breaking device drags the chips, and the projection of the breaking device with the difference relatively increasing in height properly processes the chip.
    Additionally, according to the present invention, the concave portion of chip breaking device is defined from a peripheral edge portion on the side of the projecting portion of the concave portion of chip breaking device for the bottom surface portion, for an inclined surface that is curved in a concave manner and that is smoothly connected to the bottom surface portion while gradually sloping towards the bottom surface portion, a load at the moment of heavy cutting is sufficiently supported and a defect caused by concentration voltage or the like can be avoided. In particular, it has been found that the starting point of a defect easily occurs in the vicinity of the protruding portion, and thus this can be effectively avoided. Brief Description of Drawings
    Fig. 1 is a plan view of a cutting insert that is a first embodiment; Fig. 2 is a front view of the cutting insert shown in Fig. 1; Fig. 3 is an enlarged plan view of the vicinity of a projecting portion of the cutting insert shown in Fig. 1; Fig. 4 is a cross-sectional view of line IV - IV in the Fig. 5 is a cross-sectional view of the V - V line in the Fig. 6 is a cross-sectional view of line VI - VI in the Fig. 7 is a cross-sectional view of line VII - VII in the Fig. 8 is an enlarged plan view of the vicinity of the projecting portion of the cutting insert which is a second embodiment. Description of Modalities
    Modalities of the present invention will be described with reference to the drawings. First Mode
    Fig. 1 is a plan view of a cutting insert that is a first embodiment. Fig. 2 is a front view of the cutting insert shown in Fig. 1. Fig. 3 is an enlarged plan view of the vicinity of a projecting portion of the cutting insert shown in Fig. 1. The cutting insert of the present embodiment it has no special hand, but is symmetrical with respect to a bisector B of an apex angle of the projecting portion. However, the cutting insert of the present invention is not limited to a cutting insert without a special hand, and the cutting insert described below will be described as an example in which the cutting insert is used as a right hand and has an edge linear cutting edge 6b as the main cutting edge of a working cutting edge in charge of most cuts during cutting work and a linear cutting edge 6c as a cutting sub-edge (leading cutting edge) of the cutting edge cutting work. Although the description is omitted below, if the cutting insert in Fig. 3 is used with the left hand, the linear cutting edge 6c serves as the main cutting edge of the working cutting edge and the cutting edge linear 6b serves as the cutting sub-edge. Fig. 4 is a cross-sectional view of line IV - IV in Fig. 3. Line IV _ IV is a line at bisector B of the apex angle defined by the projecting portion 5. The apex angle here refers to a angle sandwiching the projecting portion 5, at angles formed by the linear cutting edge 6b and the linear cutting edge 6c. Fig. 5 is a cross-sectional view of line V - V in Fig. 3. Line V - V is a cross-sectional line of a chip breaker groove 10 in the vicinity of a peripheral edge portion 41a on the side of the linear cutting edge 6b of a concave portion of chip breaking device 40, in a direction orthogonal to the linear cutting edge 6b which is the main cutting edge of the cutting edge 6. Meanwhile, the “neighborhood of peripheral edge portion 41a "refers to a region as close as possible to the peripheral edge portion 41a on the side of the linear cutting edge 6b of the concave chip breaking device 40 shown in Fig. 3, in the cross section line where a bottom portion 10c of the chipbreaker groove appears. Also, the bottom portion 10c of the chipbreaker groove is the deepest portion when viewed in a cross section in a direction orthogonal to the cutting edge linear 6c. When there is a plan o in the bottom portion 10c of the chip breaking device groove, a straight line appears in the section. When a straight line does not appear, the deepest point is defined as the bottom portion 10c of the chip breaking device slot. Fig. 6 is a cross-sectional view of line VI - VI in Fig. 3. Line VI - VI is an intersection of an arbitrary cross-section line with the peripheral edge portion 41b on the far side of the linear cutting edge 6b the concave portion of chip breaking device 40 shown in Fig. 3, in a direction orthogonal to the linear cutting edge 6b. Fig. 7 is a cross-sectional view of line VII - VII in Fig. 3. Line VII - VII is a cross-sectional line in a position where a projection of the breaking device 20 is brought as close to the edge of linear cut 6b in a direction orthogonal to the linear cut edge 6b. In the embodiment in Fig. 3, a rising angle r | 2 of an upright wall surface 22 of the breaking device projection is made constant, and thus line VII - VII is shown in a slightly offset position from the position where the break device projection 20 is brought as close to the linear cutting edge 6b for the purpose of making the figure easily understood. In addition, the term "chip processing" used in the following description means solving various problems caused by chips in carrying out cutting processing such that generated chips entangle the tool body or are diffused. Therefore, the cutting insert with "high chip processing performance" has a lower frequency of problem occurrence at the time of cutting processing than a cutting insert with "low chip processing performance".
    In Figs. 1 and 2, this cutting insert 1 has a plate-like shape approximately formed in diamond, in which a cutting edge 6 is formed at the peripheral edges of a top surface 2 on which a leading face 2a is formed and a surface bottom 3, and an outer peripheral surface 4 extending between the top surface 2 and the bottom surface 3 in a direction of a central axis CL perpendicular to the top surface 2 and the bottom surface 3 serves as a flank 4a. The cutting edge 6 has an arc cutting edge 6a provided with a projecting portion 5 in a corner of 80 ° and a pair of linear cutting edges 6b and 6c extending, respectively, from this arc cutting edge 6a. flank 4a is a flank having a relief angle of 0o orthogonal to the top surface 2 and the bottom surface 3 (in parallel with the central axis CL). A cutting insert material is selected from rigid materials such as cemented carbide, cermet, ceramic and the like, or the like, or the rigid materials coated with PVD or CVD coating films on the surface.
    The chip breaker groove 10 is formed on the leading face of the top surface 2 and bottom surface 3, and a narrow support 42 extending into the cutting edge 6 in a cross section] that is orthogonal to the cutting edge 6 is formed along the peripheral edge as illustrated in Figs. 1 and 4. A projection face 30 is formed in the central part of the top surface 2 and the bottom surface 3. The projection face 30 is formed so that it surrounds a cylindrical mounting hole 50 that penetrates the top surface 2 and the bottom surface 3 in a thickness direction and is a flattened surface larger than the cutting edge 6, in the direction of the thickness of the cutting insert. This projection face 30 functions as a seating surface brought into contact with a bottom surface of a chip seat, when this cutting insert is attached to the chip seat (not shown) provided in the tool body of the cutting tool such as a turning tool.
    As illustrated in Figs. 1, 3 and 4, the upright wall surface 22 of the breaker projection 20 as a chip breaker rises from a bottom surface portion 40c of the concave chipbreaker portion 40 in the direction of bisector B of the vertex angle defined by the projecting portion 5. Particularly, in the cutting insert 1, the concave portion of the chip breaking device 40 is provided only between the projecting portion 5 and the projection of the breaking device 20. Therefore, a difference in height of the chipbreaker portion with which chips are brought into contact at the time of heavy cutting decreases appropriately and also, the difference in height of the chipbreaker portion with which chips are brought into contact at the time of light cutting it increases appropriately. As a result, cutting insert 1 can appropriately process both the chips generated at the time of heavy cutting and the chips generated at the time of light cutting. If it is not necessary to use both surfaces of the cutting insert 1 and when only one surface is used, the wall height of the chip breaking device is not restricted, but the wall surface can be arranged freely. However, in the case of the negative cutting insert 1 having both surfaces used as in the present invention or the so-called two-sided chip breaking device, the wall height of the chip breaking device is restricted to a certain value of to ensure a seating surface on the bottom surface side. Therefore, in order to improve chip processing performance on the light cutting side to thereby raise the wall of the chip breaking device, it is effective to provide a concave portion of chip breaking device 40 and adjust the relative difference in height. In addition, it is effective that the upright wall surface 22 of the breaker projection 20 which further improves the chip processing performance the moment the light cut rises from the bottom surface portion 40c of the concave breaker portion of chip 40. The upright wall surface 22 is formed at the peripheral edge of the breaker projection 20. In the present embodiment, the height of the top portion of the breaker projection 20 has the same height as the projection surface 30.
    The concave chip breaker portion 40 is an inclined surface 40b that is concave curved with a predetermined radius of curvature R1 or more and that is smoothly connected to the bottom surface portion 40c while gradually tilting toward the portion bottom surface portion 40c, from the peripheral edge portion 40a on the side of the projecting portion 5 to the bottom surface portion 40c. Meanwhile, the peripheral edge portion 40a on the side of the projecting portion 5 is illustrated as a curve where the support 42 and the inclined surface 40b intersect each other in the present embodiment, but when the support 42 and the inclined surface 40b are smoothly connected with each other, the connecting portion serves as the peripheral edge portion 40a. the radius of curvature RI of the inclined surface 40b is 1 mm or greater, preferably 2 mm or greater and 3 mm or less. When the radius of curvature RI of the inclined surface 40b is of the size described above, the chip processing performance in the cutting condition on the light cutting side is improved and also, a defect at the time of heavy cutting is avoided at the same time. When the radius of curvature R1 is less than 1 mm, a load at the time of heavy cutting cannot be supported, and a starting point of a defect can be caused by this stress concentration. In addition, when this radius of curvature RI exceeds 4 mm, the chips generated at work under the condition of cutting on the light cutting side are no longer removed in the concave portion of the chip breaking device 40, and the chip processing performance could be compromised. Meanwhile, the heavy cut here means a cutting condition for turning carbon steel, for example, with the maximum cut of 3 mm or more and the maximum feed of 0.3 mm / rev or more, while the light cut refers to to a turning condition with a cut of approximately 1.0 mm up to 3 ram and the maximum feed of approximately 0.2 mm / rev. It should be noted that the radius of curvature RI of the inclined surface 40b also refers to the size of the cutting insert. This is because the larger the cutting insert size, the greater the cutting condition tends to be in use. The radius of curvature RI of the inclined surface 40b is preferably 5% or more and 30% or less of an inscribed reference circle of the cutting insert.
    In the present embodiment, the bottom surface portion 40c of the concave chip breaking device 40 forms a plane. In Figs. 1 and 3, a solid line indicating the scope of this plan is illustrated. The roundness connected to the bottom surface portion 40c has a radius of curvature RI in contact with the plane of the bottom surface portion 40c from the cutting edge side 6. In the present embodiment, the inclined surface 40c is connected to the bottom portion bottom surface 40c at a certain radius of curvature from the peripheral edge portion 40a. However, it is not limiting. A plane must not necessarily be present in the bottom surface portion 40c, and it can be a curved surface. When the bottom surface portion 40c has a curved surface, there is no plane, so the deepest portion of the curved surface is included in the bottom surface portion 40c. meanwhile, the radius of curvature RI of the inclined surface 40b connected to the bottom surface portion 40c does not need to be constant, but it can change in size in the concave portion of chip breaking device 40. For example, it is effective to configure such that the closer the curved surface is to the projecting portion 5, the larger the radius of curvature RI can be defined, and the closer to the peripheral edge portion 41a on the side of the linear cutting edge 6b of the concave portion of chip breaking device 40, the smaller the radius of curvature that can be set (not shown). In addition, the inclined surface 40b does not need to be connected to the bottom surface portion 40c within a certain radius of curvature of the peripheral edge portion 40a on the side of the projecting portion 5. For example, a cross section of the inclined surface 40b may be a short straight line from the peripheral edge portion 40a and can be connected to the bottom surface portion 40c following the straight line, within a certain radius of curvature. The radius of curvature when connected to the bottom surface portion 40c is important.
    In the cross-sectional view of line V - V orthogonal to the linear cutting edge 6b in Fig. 5, the chip breaking device groove 10 in the present embodiment is provided with the narrow support 42 extending inwardly from the cutting edge. linear cut 6b. Chip breaker groove 10 is an inclined surface 10b that is concavely curved and that is smoothly connected to the bottom surface portion while gradually sloping towards the bottom surface portion from the bottom portion. peripheral edge 10a on the side of the linear cutting edge 6b to the bottom portion 10c of the breaker groove. A radius of curvature of the inclined surface is R2. The radius of curvature R2 may be less than the radius of curvature RI of the inclined surface 40b of the concave portion of chip breaking device 40. Since it is not necessary to increase the radius of curvature R2 of the inclined surface 10b of the breaking device groove 10, freedom of design with respect to the shape of the cross-section of the chip break device 10 is guaranteed. The radius of curvature R2 of the inclined surface 10b of the chip breaker slot 10 can be set to, for example, 0.5 mm or less.
    It is not preferable that a restraining force on the chips is very strong at the time of heavy cutting. When chips are severely constrained during heavy cutting, an increase in cutting resistance or the occurrence of vibration causes roughness deterioration on a worked surface or causes abnormal damage such as a defect in the cutting insert. In the present embodiment, due to the fact that the concave portion of chip breaking device 40 is provided only between the vicinity of the projecting portion 5 and the vicinity of a front end of the projection of the breaking device 20, an average value of the device depth break at the moment of heavy cutting becomes small. Therefore, the difference in height of the wall of the chip breaking device acting at the time of heavy cutting becomes smaller than at the time of light cutting, and the restraining force on the chips is not so great. As a result, the cutting insert 1 can properly handle the chips.
    The concave portion of chip breaking device 40 also has an effect of decreasing a contact area between the cutting insert 1 and the chips by not removing the chips generated at the moment of heavy cutting in the concave portion of the chip breaking device 40, but controversially, causing them to float upwards. When the contact area between the cutting insert 1 and the chips decreases, the cutting resistance is reduced, an amount of heat generation is suppressed, abrasion in the tool is suppressed and the tool life is extended. In order to cause the chips, at the time of heavy cutting, to float in the concave portion of the chip breaking device 40, the wall surface 22 of at least one projection of the breaking device 20 is made to stand upright from the bottom surface portion 40c of the concave chip breaking device 40. Arranging the breaking device projection 20 as above, the breaking device projection acts in the direction the chips are raised.
    When the crest line of the peripheral edge portion 41a on the linear cutting edge side 6b of the concave chip breaking device 40 (here this portion will be referred to as a “first peripheral edge portion of the concave portion 41a") is formed to separate from the projecting portion 5 while separating from the cutting edge, there is no obstacle in an outflow direction of the chips at the time of heavy cutting, and an effect by which the first peripheral edge portion of the concave portion 41a does not is allowed to function as a chip breaking device. Therefore, the chips generated at the time of heavy cutting float in the concave portion of chip breaking device 40, and a bad influence at the time of heavy cutting as a result of the presence of the portion When the shape of the first peripheral edge portion of concave edge 41a is expressed by an angle 0 formed with the linear cutting edge 6b, it is preferable that 40 ° <0o <85 ° is defined.
    The ridge line of the first concave peripheral edge portion 41a need not be a straight line, but can separate from the projecting portion 5 while separating from the cutting edge 6 as in Fig. 8, for example. In addition, another form can be a convex curve, a concave curve or a curve obtained by combining concavity and convexity or straight lines. Meanwhile, as the chip breaking device acts only on a strip in contact with the chips in general, the shape of the cutting edge 6 to the strip contact with the chips is important, and the shape of the portion sufficiently far from the edge cut 6 is not particularly important. However, the chip contact range according to the cutting condition or a workpiece.
    An increasing angle of surface wall ql towards the peripheral edge portion 41b on the far side of the linear cutting edge 6b of the concave chip breaking device 40 (here this portion will be referred to as a “second peripheral edge portion of concave portion 41b ") is less than the rising angle q2 of the upright wall surface 22 of the breaker projection 20. That is, as long as ql <q2 holds, the second peripheral edge portion of concave portion 41b does not work as a chip breaking device at the time of heavy cutting. Defining the increasing angles of surface wall ql and q2, the increasing angle in the direction facing the outflow direction of the chips is highly associated with the fact that the first portion peripheral edge of concave portion 41a and the second portion of peripheral edge of concave portion 41b function as chip breaking devices.The direction of outflow of the chip is changed depending on the cond cutting option, but in the cutting insert 1 of the present modality, the increasing angle of the surface wall is defined in the cross section in the direction orthogonal to the linear cutting edge 6b close to the flow exit direction at the time of heavy cutting.
    Meanwhile, when the cross-sectional shape of the wall surface that continues from the bottom surface portion 40c of the concave portion of chip breaking device, to the second peripheral edge portion of the concave portion 41b is not linear, the increasing angles surface wall ql and q2 when the top portion of the surface wall is rounded, for example, cannot be obtained by comparing the tangent line to the vicinity of the top surface of the above-described top surface that continues to the second portion of peripheral edge of concave portion 41b and the tangent line in the vicinity of the top surface of the upright wall surface 22 of the break device projection 20, and so the increasing angles of the surface wall are defined in an appropriate position to be a reference . For example, it is the ridge surface 30. After the position to be reference is defined, the increasing angle ql of the wall surface at a height away from the reference site by a certain distance is compared with the increasing angle q2 of the upright wall surface 22 of the projection of the breaking device. In the case of the present embodiment, since the height of the top surface of the second concave peripheral edge portion 41b and the height of the top surface of the break device projection are different from each other, the increasing angles ql er | 2 in the neighborhood of the top surface cannot be compared to each other. When comparing the tangent lines at positions with the same height difference from the ridge surface 30, it is preferable that the increasing angle pl of the wall surface described above is less than the increasing angle i] 2 of the upright wall surface. 22. Furthermore, in the case of the cross-sectional shape having an arc in the vicinity of the top surface, since it makes no sense to compare the tangent angles in the arc-shaped top portion, the tangent angles at the same heights are set to ql and i] 2, respectively, and are also compared to each other in this case.
    In this embodiment, the first peripheral edge portion of concave portion 41a is arranged so as to start in a position away from the protruding portion 5 by approximately 0.1 mm to 3 mm and also to separate from the protruding portion 5 as it separates from the edge cut-off 6. While the position where the first concave peripheral edge portion 41a starts, an appropriate value in relation to a corner radius of the projecting portion 5 is selected.
    In the present embodiment, the reason that the concave portion of chip breaking device 40 is formed symmetrically with respect to bisector B of the apex angle of the projecting portion 5 is to obtain similar cutting performance for both uses even when one direction of use of the tool is such that the right side of the projecting portion 5 is mainly used as the working cutting edge and when the left side is mainly used as the working cutting edge. That is, this shape is employed in such a way that the cutting insert 1 of the present embodiment can be used as a cutting insert without any special hand. Therefore, the first concave peripheral edge portion 41a and the second concave peripheral edge portion 41b are preferably designed in such a way that they require crest line shapes and increasing surface wall angles are different from each other in view of the functions, but in this embodiment, the concave portion of chip breaking device 40 is formed symmetrically with respect to the bisector of the apex angle of the projecting portion 5 and also, the crest line shapes as described above the first peripheral edge portion of concave portion 41a and the second peripheral edge portion of concave portion 41b, and the magnitude relationship between the increasing angle ql of the surface wall described above and the increasing angle r | 2 of the upright wall surface 22 are both achieved at the same time . Therefore, similar cutting performance can be achieved for both right and left cutting edge uses.
    In the present embodiment, as illustrated in those Figs. 4 and 5, for example, the leading face 2a is formed to have a relatively smooth cross-sectional shape. However, the angle of attack can also be changed in stages in the form of a cross section, such as a first angle of attack and a second angle of attack. In addition, the angle of attack can also be changed either continuously or intermittently as it separates from the projecting portion 5 along the cutting edge 6.
    The cutting insert of the present invention is not limited to the modalities described above, but is capable of several changes and additions within a range that does not escape the essence of the present invention. Although not shown, the external shape of the cutting insert can be a polygonal plate shape different from the diamond plate shape, and it can be a so-called positive cutting insert having a relief angle greater than 0 °. In addition, the chip breaker groove 10 need not be provided along the entire edge of the cutting edge 6, but can be provided only within a desired range. The number of breaker projections 20 need not be 1 but it is also effective that a plurality of breaker projections is provided around the projecting portion in order to properly handle various directions of chip outflow. The upright wall surface 22 of the breaker projection 20 can be configured by a single or a plurality of curved planes or surfaces. In addition, edging composed of curved or planar chamfering can be added to the cutting edge crest portion along the cutting edge 6 to reinforce the edge or a negative angle can be added and the support 42 of the cutting edge crest portion cutting can be tilted. Additionally, controversially, a positive angle can be added and the support 42 can be tilted for the purpose or type to lower the shear strength. The cutting insert of this invention can also be applied to a threaded cutting insert (not shown) or milling cutting insert (not shown). Industrial Applicability
    The cutting insert of the present invention can be used for cutting processing a metal material being detachably attached to a tool body in the same way as such a cutting insert of the prior art. Also, a method of manufacturing it is the same as that of the cutting insert of the prior art.
    权利要求:
    Claims (4)
    [0001]
    Cutting insert (1) formed from a plate-like member with a substantially polygonal external shape and comprising:
    an attack face (2a) with a chip breaking device (20) which is formed on at least one surface between top and bottom surfaces (2, 3);
    a flank formed on an outer periphery surface that extends between the top and bottom surfaces; and
    a cutting edge (6) formed at an intersecting portion between the leading face and the flank, the cutting edge (6) comprising an arc-shaped cutting edge (6a) being curved into an arc shape and located in at least a portion between projecting portions (5), a working cutting edge (6b) extending from one side of the arc-shaped cutting edge (6a), and a linear cutting edge (6c) that extends from the other side of the arc-shaped cutting edge (6a), where
    a concave portion (40) of the chip breaking device is formed in the vicinity of the arc-shaped cutting edge on the leading face;
    a projection of the breaking device (20) rises from a bottom surface portion (40c) of said concave portion (40) of the chip breaking device;
    that concave portion (40) of the chip breaking device is defined by an inclined surface (40b), which is curved in a concave manner, and which is smoothly connected to the bottom surface portion (40c), while it is gradually inclined towards that bottom surface portion (40c), from a peripheral edge portion (40a) on the side of the projecting portion (5) to the bottom surface portion (40c);
    on the leading face (2a), a groove (10) of the chip breaking device is formed adjacent to the concave portion (40) of the chip breaking device and the projection of the breaking device (20);
    the groove (10) of the chip breaking device comprises an inclined surface (10b) which is concave curved and which is smoothly connected to a bottom portion (10c) of the groove of the chip breaking device, whereas it is gradually inclined towards that bottom portion (10c), from a peripheral edge portion (10a) on the side of the working cutting edge to the bottom portion (10c) of the groove (10) of the chip breaking device ; and
    characterized by the fact that a radius of curvature R2 of the inclined surface (10b) of the groove (10) of the chip breaking device is smaller than a radius of curvature RI of the inclined surface (40b) of the concave portion (40) of the chip breaking device.
    [0002]
    Cutting insert (1), according to claim 1, characterized by the fact that:
    the peripheral edge portion (40a) on the groove side (10) of the chip breaking device of that concave portion (40) of the chip breaking device extends from the side of the projecting portion (5) to the projection side breaking device (20).
    [0003]
    Cutting insert (1), according to claim 1 or 2, characterized by the fact that:
    that concave portion (40) of the chip breaking device is defined by a wall surface that rises from that bottom surface portion (40c) of the concave portion (40) of the chip breaking device to an edge portion peripheral (41b) on the groove side (10) of the chip breaking device; and
    an increasing angle q 1 of the wall surface in relation to a plane in parallel with the top and bottom surfaces (2, 3) is less than an increasing angle q2 of a wall surface (22) of that projection device breaks (20) in relation to a plane in parallel with the top and bottom surfaces.
    [0004]
    Cutting insert (1) according to any one of claims 1 to 3, characterized by the fact that:
    that concave portion (40) of the chip breaking device is formed symmetrically with respect to a bisector of an apex angle (0) defined by the projecting portion (5).
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    同族专利:
    公开号 | 公开日
    RU2532612C2|2014-11-10|
    JP5206905B2|2013-06-12|
    KR20120134151A|2012-12-11|
    EP2570211B1|2020-07-15|
    CN102905824A|2013-01-30|
    EP2570211A4|2014-07-23|
    CA2797022A1|2011-11-17|
    EP2570211A1|2013-03-20|
    JPWO2011142297A1|2013-07-22|
    US20130094914A1|2013-04-18|
    BR112012027776A2|2016-08-02|
    CN102905824B|2015-01-28|
    RU2012147794A|2014-06-20|
    WO2011142297A1|2011-11-17|
    US8876441B2|2014-11-04|
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    法律状态:
    2018-12-26| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-09-17| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-05-05| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-06-23| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 06/05/2011, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2010-109587|2010-05-11|
    JP2010109587|2010-05-11|
    PCT/JP2011/060589|WO2011142297A1|2010-05-11|2011-05-06|Cutting insert|
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