Cutting inserts and cutting tools

Abstract

This invention discloses a cutting insert and a cutting tool, relating to the field of cutting tool technology. The cutting insert has an upper wall and a side wall. At least a portion of the intersection of the upper wall and the side wall forms a cutting edge, which includes at least an arc-shaped cutting tip. The upper wall has a rake face, a chip breaker groove, and a top surface. The upper wall has a raised portion corresponding to the cutting tip, at least a portion of which is located within the chip breaker groove. The raised portion extends from the top surface to the rake face and forms a guide groove that extends from the top surface to the rake face. By providing the raised portion, it can be supported at least between the groove wall of the chip breaker groove and the rake face, improving the structural strength of the cutting insert. By further forming a guide groove in the raised portion, it is beneficial for chip curling and improves chip removal smoothness, reducing the risk of chip clogging. At the same time, the guide groove can also guide the cutting fluid, improving the cooling efficiency of the cutting insert and reducing the risk of chipping or damage to the cutting insert.

Description

Technical Field

[0001] This invention relates to the field of cutting tool technology, and more particularly to a cutting insert and a cutting tool. Background Technology

[0002] In the field of metal cutting, cutting inserts are often designed with high feed rates in mind, usually neglecting the smoothness of chip removal. Poor chip removal can easily lead to friction between the chips and the cutting insert, generating a lot of cutting heat, which in turn aggravates the wear of the cutting insert and increases the risk of chipping. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a cutting insert that can effectively improve chip removal smoothness, while also improving the heat dissipation efficiency of the cutting insert and reducing the risk of cutting insert chipping.

[0004] According to an embodiment of the present invention, the cutting insert has an upper wall surface and a side wall surface intersecting the upper wall surface. At least a portion of the intersection of the upper wall surface and the side wall surface forms a cutting edge. The cutting edge includes at least a main cutting edge, a finishing edge, and a tip cutting edge connected between the main cutting edge and the finishing edge. The tip cutting edge extends in an arc shape. The upper wall surface has a rake face, a chip breaker groove, and a top surface. The chip breaker groove is disposed around the top surface circumferentially. The chip breaker groove is connected between the rake face and the top surface. The rake face is adjacent to the intersection of the upper wall surface and the side wall surface. The upper wall surface has a raised portion corresponding to the tip cutting edge. At least a portion of the raised portion is located within the chip breaker groove. The raised portion extends from the top surface to the rake face, and the raised portion forms a guide groove that extends from the top surface to the rake face.

[0005] According to embodiments of the present invention, the cutting insert has a raised portion corresponding to the cutting edge of the cutting tip and extending from the top surface to the rake face. At least part of the raised portion is located within the chip breaker groove, so that the raised portion can be supported at least between the groove wall of the chip breaker groove and the rake face, effectively improving the structural strength of the cutting insert. Furthermore, by forming a guide groove in the raised portion, it is beneficial to curl the chips and improve the smoothness of chip discharge, reducing the risk of chip blockage. At the same time, the guide groove can also guide the cutting fluid, effectively improving the cooling efficiency of the cutting insert, effectively reducing the risk of chipping or damage to the cutting insert, and extending the service life of the cutting insert.

[0006] According to some embodiments of the present invention, the depth dimension of the guide groove gradually increases from the top surface to the front cutting face, and the width dimension of the guide groove gradually increases.

[0007] According to some embodiments of the present invention, the depth variation rate of the guide channel is 15%-35%.

[0008] According to some embodiments of the present invention, the guide channel has a bottom wall, and the angle α between the bottom wall and the extended surface of the top surface satisfies the following relationship: 5°≤α≤30°.

[0009] According to some embodiments of the present invention, the inner wall of the guide groove is a first concave surface, and the radius of curvature of the first concave surface gradually increases from the top surface to the front blade surface.

[0010] According to some embodiments of the present invention, the radius of curvature Rc at the position where the first concave surface is adjacent to the top surface, and the radius of curvature Rf at the position where the first concave surface is adjacent to the rake face, satisfy the relationship: 0.1≤Rc / Rf≤0.6.

[0011] According to some embodiments of the present invention, the raised portion further forms a stress-bearing ridge and a chip-guiding ridge, the guide groove is located between the stress-bearing ridge and the chip-guiding ridge, both the stress-bearing ridge and the chip-guiding ridge extend from the top surface to the rake face, and portions of the stress-bearing ridge and the chip-guiding ridge are located within the chip-breaking groove.

[0012] According to some embodiments of the present invention, the stress-bearing ridge and the chip-guiding ridge participate in defining the channel sidewall forming the guide channel.

[0013] According to some embodiments of the present invention, the ratio of the volume V1 of the stress-bearing ridge to the volume V2 of the raised portion satisfies the following relationship: 0.15≤V1 / V2≤0.25.

[0014] According to some embodiments of the present invention, from the top surface to the rake face, the width dimensions of the stress-bearing ridge and the chip-guiding ridge both gradually increase and then gradually decrease.

[0015] According to some embodiments of the present invention, the stress-bearing ridge includes a first part and a second part connected together. From the top surface to the rake face, the width of the first part gradually increases and the width of the second part gradually decreases. The chip-guiding ridge includes a third part and a fourth part connected together. From the top surface to the rake face, the width of the third part gradually increases and the width of the fourth part gradually decreases. Defined within the same cross section, the width of the first part is A1 and the width of the third part is A2, satisfying the relationship: 1≤A1 / A2≤2.

[0016] According to some embodiments of the present invention, at least one of the top wall of the chip guide ridge facing away from the concave direction of the guide groove and the top wall of the stress bearing ridge facing away from the concave direction of the guide groove is formed as a second concave surface, the second concave surface extending from the top surface to the rake face.

[0017] According to some embodiments of the present invention, the radius of curvature R1 of the second concave surface is within the range of the following relationship: 3mm≤R1≤10mm; the maximum depth of the guide groove is H1, and the maximum depth of the second concave surface is H2, satisfying the relationship: H1>H2.

[0018] According to some embodiments of the present invention, the moment of inertia of the cross section of the stress-bearing ridge is I1, and the moment of inertia of the cross section of the chip-guiding ridge is I2, satisfying the relationship: 2.5≤I1 / I2.

[0019] According to some embodiments of the present invention, a stress buffer gradient region is formed within the stress-bearing ridge, and the density of the buffer gradient region gradually decreases from the surface of the stress-bearing ridge to the interior of the stress-bearing ridge.

[0020] According to an embodiment of the present invention, a cutting tool includes: a tool body and a cutting insert, wherein the cutting insert is the cutting insert described above, and the cutting insert is mounted on the tool body.

[0021] The cutting tool described above has the same advantages as the cutting inserts mentioned above, and will not be elaborated upon here.

[0022] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0024] Figure 1 This is a schematic diagram of the structure of the cutting blade described in an embodiment of the present invention. Figure 1 ;

[0025] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0026] Figure 3 This is a schematic diagram of the structure of the cutting blade described in an embodiment of the present invention. Figure 2 ;

[0027] Figure 4 for Figure 3 A partial enlarged view of the sectional view at AA;

[0028] Figure 5 for Figure 3 A partial enlarged view of the section view at BB;

[0029] Figure 6 for Figure 3 A partial enlarged view of the section view at CC;

[0030] Figure 7 This is a schematic diagram of the cutting tool described in an embodiment of the present invention.

[0031] Figure label:

[0032] Cutting insert 100

[0033] Upper wall surface 110, rake face 111, chip breaker groove 112, top surface 113

[0034] Side wall 120, corner 131,

[0035] Main cutting edge 131, first main cutting edge 1311, second main cutting edge 1312

[0036] Polishing edge 132, cutting edge at the tip 133

[0037] 140 raised section, 141 guide channel, 1411 bottom wall of channel, 1412 inner wall of channel, 1413 side wall of channel

[0038] Stress-bearing ridge 142, first part 1421, second part 1422

[0039] Chip guide ridge 143, third part 1431, fourth part 1432.

[0040] Second concave surface 150°, lower wall surface 160°

[0041] Cutting tool 1000, tool body 200. Detailed Implementation

[0042] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0043] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] The following reference Figures 1-7 The cutting insert 100 and cutting tool 1000 according to embodiments of the present invention are described.

[0046] like Figure 1 As shown, the cutting insert 100 according to an embodiment of the present invention has an upper wall surface 110 and a side wall surface 120 intersecting the upper wall surface 110. At least a portion of the intersection of the upper wall surface 110 and the side wall surface 120 forms a cutting edge. The cutting edge includes at least a main cutting edge 131, a finishing edge 132, and a tip cutting edge 133 connected between the main cutting edge 131 and the finishing edge 132. The tip cutting edge 133 extends in an arc shape to avoid stress concentration caused by the right-angle connection between the main cutting edge 131 and the finishing edge 132, which is beneficial for dispersing stress and reducing the wear of the cutting insert 100, thereby improving the service life of the cutting insert 100.

[0047] The upper wall surface 110 has a rake face 111, a chip breaker groove 112 and a top surface 113. The chip breaker groove 112 is arranged around the top surface 113 in the circumferential direction. The chip breaker groove 112 is connected between the rake face 111 and the top surface 113. The rake face 111 is adjacent to the intersection of the upper wall surface 110 and the side wall surface 120.

[0048] For example, the rake face 111 is located on the outermost side of the upper wall surface 110 near the cutting edge and is directly adjacent to the intersecting edge (which can also be understood as the cutting edge) of the upper wall surface 110 and the side wall surface 120. It can serve as the direct outlet surface for chips. The top surfaces 113 and the rake face 111 are respectively connected on both sides of the chip breaker groove 112. The chip breaker groove 112 is concave downward relative to the rake face 111 and the top surface 113. It can also be understood that the rake face 111 extends obliquely downward in the direction extending from the cutting edge to the center of the cutting insert 100, and the rake face 111 can serve as the chip breaker. The chip breaker acts as a guide to allow the chips to flow to the chip breaker groove 112. At least part of the groove wall of the chip breaker groove 112 extends upward at an angle. As the chips pass through the rake face 111 and flow through the chip breaker groove 112, they will impact the upwardly extending groove wall of the chip breaker groove 112 and bend, thereby reducing the curl radius of the chips. This helps to improve chip removal smoothness, reduce the risk of chip accumulation, and further help to prevent the risk of chips rubbing against the rake face 111 or the cutting edge due to chip accumulation, thereby reducing the risk of cutting edge chipping or damage and extending the service life of the cutting insert 100.

[0049] Furthermore, the upper wall surface 110 is provided with a raised portion 140 corresponding to the cutting edge 133 of the tool tip. At least a portion of the raised portion 140 is located in the chip breaker groove 112. The raised portion 140 extends from the top surface 113 to the rake face 111. The raised portion 140 forms a guide groove 141, which extends from the top surface 113 to the rake face 111.

[0050] For example, the raised portion 140 extends from the top surface 113 to the rake face 111, and at least a portion of the raised portion 140 protrudes from the groove wall of the chip breaker groove 112 and the rake face 111 respectively. In other words, at least a portion of the raised portion 140 is supported between the chip breaker groove 112 and the rake face 111, which helps to improve the structural strength of the cutting insert 100, reduce the risk of damage to the cutting insert 100, and thus help to further extend the service life of the cutting insert 100.

[0051] The raised portion 140 also forms a guide groove 141, and the raised portion 140 is correspondingly arranged with the cutting edge 133. Therefore, the guide groove 141 can be at least partially corresponding with the cutting edge 133. At least part of the chips generated when the cutting edge 133 is working can flow into the guide groove 141 after passing through the rake face 111. The groove wall of the guide groove 141 can act on the chips to make the chips curl. At the same time, the guide groove 141 can also guide the chips, which is conducive to further improving the smoothness of chip discharge and reducing the risk of increased cutting resistance caused by chip blockage and other problems. At the same time, the guide groove 141 can also guide the cutting fluid, improve the cooling efficiency of the cutting insert 100, thereby further reducing the risk of chipping of the cutting insert 100 and extending the service life of the cutting insert 100.

[0052] According to an embodiment of the present invention, the cutting insert 100 has a raised portion 140 corresponding to the cutting edge 133 at the tip and extending from the top surface 113 to the rake face 111. At least a portion of the raised portion 140 is located within the chip breaker groove 112, so that the raised portion 140 can be supported at least between the groove wall of the chip breaker groove 112 and the rake face 111, which effectively improves the structural strength of the cutting insert 100. Furthermore, by forming a guide groove 141 in the raised portion 140, it is beneficial to curl the chips and improve the smoothness of chip discharge, reducing the risk of chip blockage. At the same time, the guide groove 141 can also guide the cutting fluid, thereby effectively improving the cooling efficiency of the cutting insert 100, effectively reducing the risk of chipping or damage to the cutting insert 100, and extending the service life of the cutting insert 100.

[0053] Combination Figure 1 and Figure 3 In some specific embodiments of the present invention, the cutting blade 100 has a generally quadrilateral profile in its orthographic projection in the thickness direction, and the cutting blade 100 also has a lower wall surface 160, a side wall surface 120 connected between the upper wall surface 110 and the lower wall surface 160, and the side wall surface 120 has an arc transition at the apex of the quadrilateral to form a corner 131. In the thickness direction of the cutting blade 100, the cutting edge 133 at the tip is disposed opposite to the corner 131.

[0054] The main cutting edge 131 also includes a first main cutting edge 1311 and a second main cutting edge 1312. One side of the tip cutting edge 133 is connected to the finishing edge 132, and the other side is connected to the second main cutting edge 1312. The side of the finishing edge 132 away from the tip cutting edge 133 is connected to the first main cutting edge 1311, and the side of the first main cutting edge 1311 away from the finishing edge 132 is connected to the second main cutting edge 1312. In other words, the cutting tool has a quadrilateral arrangement on its orthographic projection surface. Each edge formed by the intersection of the upper wall surface 110 and the side wall surface 120 of the plate 100 is provided with a straight-line extending finishing edge 132, a first main cutting edge 1311 and a second main cutting edge 1312. The finishing edge 132 and the first main cutting edge 1311, and the first main cutting edge 1311 and the second main cutting edge 1312 are arranged at an angle. This facilitates the step-by-step distribution of cutting load by the cutting edge, disperses stress, and reduces the risk of the cutting edge chipping due to overload.

[0055] Combination Figure 1 and Figure 2 In some embodiments of the present invention, the depth dimension of the guide groove 141 gradually increases from the top surface 113 to the front blade surface 111.

[0056] It should be noted that the "depth dimension of the guide groove 141" refers to the dimension of the guide groove 141 being recessed in the direction perpendicular to the top surface 113.

[0057] In the above technical solution, since the depth dimension of the guide groove 141 gradually increases from the top surface 113 to the rake face 111, when the cutting fluid flows from the top surface 113 to the rake face 111, part of the cutting fluid flowing into the guide groove 141 can gradually converge towards the position close to the rake face 111, so that a deeper cutting fluid convergence area can be formed near the rake face 111, which is beneficial to improve the wetting effect of the cutting fluid. Therefore, it can effectively improve the cooling effect and lubrication effect, thereby reducing the risk of cutting edge wear and extending the service life of the cutting insert 100.

[0058] In some embodiments of the present invention, the depth variation rate of the guide groove 141 is 15%-35%, which is beneficial to improve the effect of the guide groove 141 on chip guidance, and also beneficial to reduce the chip curling radius, reduce the risk of cutting blockage and entanglement, while also beneficial to disperse stress, reduce the risk of damage to the guide groove 141 due to stress concentration, thereby reducing the risk of damage to the cutting blade 100.

[0059] If the depth change rate of the guide channel 141 is less than 15%, then the increase in depth of the guide channel 141 is too gradual, the channel wall of the guide channel 141 has a poor shaping effect on the chips, which easily leads to an excessively large curling radius of the chips. The chips are easy to accumulate or wrap around the cutting blade 100 or the workpiece to be cut, which will not only affect the flow effect of the cutting fluid, but also easily scratch the machined surface.

[0060] If the depth change rate of the guide groove 141 is greater than 35%, it means that the depth of the guide groove 141 will change drastically. On the one hand, chips are easy to accumulate in the guide groove 141 and are not easy to be discharged. On the other hand, the groove wall of the guide groove 141 is likely to be angular, which increases the risk of stress concentration and thus increases the risk of damage to the guide groove 141, affecting the service life of the cutting tool 100.

[0061] Combination Figures 1 to 3 In some embodiments of the present invention, the width of the guide groove 141 gradually increases from the top surface 113 to the front blade surface 111.

[0062] The cutting flow direction is from the cutting edge to the top surface 113. In the above technical solution, by gradually increasing the width of the guide groove 141 from the top surface 113 to the rake face 111, it is beneficial to reduce the risk of increased friction between the cutting edge and the rake face 111 and the cutting edge due to the accumulation of chips near the rake face 111. On the other hand, it is also beneficial to ensure the shaping effect of the groove wall of the guide groove 141 on the chips, so that the chips can be curled into smaller-radius chips and broken chips under the action of the groove wall of the guide groove 141 during the flow of the chips, which is beneficial to improve the smoothness of chip discharge.

[0063] Combination Figure 1 , Figure 3 and Figure 4 In some embodiments of the present invention, the guide channel 141 has a bottom wall 1411, and the angle α between the bottom wall 1411 and the extended surface of the top surface 113 satisfies the following relationship: 5°≤α≤30°.

[0064] For example, the guide groove 141 can be understood as being formed by the side of the raised portion 140 connected between the top surface 113 and the front blade surface 111, which is inclined and recessed inward. After the guide groove 141 is formed, this side is the inner wall 1412 of the guide groove 141, and the bottom wall 1411 is part of the inner wall 1412. For example, the side of the raised portion 140 connected between the top surface 113 and the front blade surface 111 is inclined and recessed inward, and is formed as the inner wall 1412 extending in a curved surface. The side of the guide groove 141 that is directly opposite to the inner wall 1412 is open. The deepest recessed part of the inner wall 1412 is the bottom wall 1411, and the angle α between the bottom wall 1411 and the extended surface of the top surface 113 determines the recessed effect of the inner wall 1412.

[0065] In the above technical solution, by making the range of α satisfy the relationship: 5°≤α≤30°, not only can the curling effect of the chips be guaranteed and chip accumulation be prevented, but also the risk of increased axial cutting force of the cutting insert 100 due to the excessive volume of the raised part 140 can be reduced. This helps to reduce the risk of chipping caused by vibration of the cutting insert 100 and effectively extend the service life of the cutting insert 100.

[0066] If α < 5°, it means that the distance between the bottom wall 1411 of the groove and the opening of the guide groove 141 is too small. It can also be understood that the volume of the raised part 140 reduced by machining the guide groove 141 is small, which leads to the volume of the raised part 140 being large, thereby increasing the axial cutting force of the cutting tool 100 and increasing the vibration generated by the cutting tool 100 during operation, thus making the cutting tool 100 prone to chipping.

[0067] If α > 30°, it indicates that the distance between the bottom wall 1411 of the groove and the open opening of the guide groove 141 is too large. In this case, the distance between the bottom wall 1411 of the groove and the rake face 111 and the cutting edge will be even larger. Some of the generated chips will be difficult to be discharged under the action of the guide groove 141, resulting in the accumulation of chips near the rake face 111 and the cutting edge. This will not only affect the flow of cutting fluid, but also aggravate the friction of chips on the rake face 111 and the cutting edge, thereby increasing the risk of damage to the cutting insert 100.

[0068] It should be noted that the "opening of the guide groove 141" mentioned above refers to the opening of the guide groove 141 facing the top surface 113 in the thickness direction of the cutting blade 100.

[0069] Combination Figure 1 , Figure 3 , Figure 5 and Figure 6In some embodiments of the present invention, the inner wall 1412 of the guide groove 141 is a first concave surface, and the radius of curvature of the first concave surface gradually increases from the top surface 113 to the front blade surface 111.

[0070] In other words, in the direction from which the chips are discharged from the guide channel 141, the radius of curvature of the first concave surface gradually decreases, and the curvature of the first concave surface gradually increases. In other words, in the direction of chip discharge, the first concave surface gradually tightens, and its shaping effect on the chips gradually increases, so that the amount of plastic deformation of the chips gradually increases during the process of chip discharge from the guide channel 141. This is beneficial to improving the chip breaking effect, reducing the risk of chip entanglement, and also beneficial to improving the constraint effect of the guide channel 141 on the chips and improving the directional discharge effect of the chips.

[0071] Combination Figure 1 , Figure 3 , Figure 5 and Figure 6 In some embodiments of the present invention, the radius of curvature Rc at the position where the first concave surface is adjacent to the top surface 113, and the radius of curvature Rf at the position where the first concave surface is adjacent to the rake surface 111, satisfy the relationship: 0.1≤Rc / Rf≤0.6.

[0072] In the above technical solution, by making Rc and Rf satisfy the relationship: 0.1≤Rc / Rf≤0.6, firstly, it is beneficial to reduce the wear of the guide groove 141 when the chips enter the guide groove 141 and to ensure the smooth flow of chips. Secondly, it is beneficial to ensure the curling and chip breaking effect when the chips flow out of the guide groove 141. Thirdly, it is also beneficial to reduce the risk of poor chip discharge due to chip jamming.

[0073] If Rc / Rf < 0.1, it means that the curvature of the guide groove 141 becomes drastically smaller near the chip discharge position. This not only makes it easy for chips to splash and scratch the machined surface, but also increases the resistance when chips are discharged, resulting in chip accumulation.

[0074] If Rc / Rf > 0.6, it indicates that the curvature of the guide groove 141 near the chip discharge position is insufficient, resulting in small plastic deformation of the chips and easy accumulation of chips.

[0075] Reference Figure 1 In some embodiments of the present invention, the raised portion 140 is further formed with a stress-bearing ridge 142 and a chip-guiding ridge 143, and a guide groove 141 is located between the stress-bearing ridge 142 and the chip-guiding ridge 143. Both the stress-bearing ridge 142 and the chip-guiding ridge 143 extend from the top surface 113 to the rake face 111, and a portion of the stress-bearing ridge 142 and a portion of the chip-guiding ridge 143 are located within the chip-breaking groove 112.

[0076] For example, the stress-bearing ridge 142 can be provided near the connection between the cutting edge 133 and the finishing edge 132. When the cutting insert 100 is working, the side of the cutting edge 133 near the finishing edge 132 can contact the workpiece first. Then, the part of the cutting edge 133 near the finishing edge 132 bears the stress first. At this time, the stress-bearing ridge 142 can support the cutting edge 133 and share the stress, which helps to reduce the risk of cutting edge damage and also helps to extend the service life of the cutting insert 100.

[0077] The chip guide ridge 143 can be set near the connection between the cutting edge 133 and the main cutting edge 131 (specifically, the second main cutting edge 1312). When the side of the cutting edge 133 near the finishing edge 132 contacts the workpiece and forms chips, the chip guide ridge 143 can guide the chips, improve the flow of chips along the guide groove 141, and improve the smoothness of chip discharge. In addition, when the cutting insert 100 rotates further, the chip guide ridge 143 can also support the cutting edge 133 and share the stress, which helps to reduce the risk of cutting edge damage and extend the service life of the cutting insert 100.

[0078] Combination Figure 1 and Figure 2 In some embodiments of the invention, stress-bearing ridge 142 and chip-guiding ridge 143 participate in defining the channel sidewall 1413 that forms the flow channel 141.

[0079] It should be noted that the sidewall 1413 of the tank is part of the inner wall 1412 of the tank.

[0080] For example, the guide groove 141 can be understood as being formed by the central region of the side of the raised portion 140 that connects the top surface 113 and the rake face 111, recessed into the raised portion 140. After the guide groove 141 is formed, the portions on both sides of the guide groove 141 form the chip guiding ridge 143 and the stress bearing ridge 142, respectively. Thus, there is no need to separately process the guide groove 141, the chip guiding ridge 143 and the stress bearing ridge 142, which effectively simplifies the processing steps of the cutting insert 100, reduces the processing difficulty of the cutting insert 100, and thus helps to improve the production efficiency of the cutting insert 100 and reduce the production cost of the cutting insert 100.

[0081] Furthermore, from the top surface 113 to the rake face 111, the distance between the chip guide ridge 143 and the stress bearing ridge 142 gradually increases, so that the width of the guide groove 141 gradually increases, reducing the risk of increased friction between the cutting edge and the rake face 111 and the cutting edge due to chip accumulation near the rake face 111. In addition, the chips can be curled into smaller-radius chips and broken chips under the action of the groove wall of the guide groove 141 during the flow of the chips, which is beneficial to improving the smoothness of chip discharge.

[0082] In some embodiments of the present invention, the ratio of the volume V1 of the stress-bearing ridge 142 to the volume V2 of the raised portion 140 satisfies the following relationship: 0.15≤V1 / V2≤0.25. In other words, the volume of the stress-bearing ridge 142 accounts for 15%-25% of the overall volume of the raised portion 140. On the one hand, this helps to prevent the stress-bearing ridge 142 from encroaching on the arrangement space of the guide groove 141 and the chip guide ridge 143 due to its excessive volume, thereby reducing the risk of poor chip removal. On the other hand, it also prevents the stress-bearing ridge 142 from having poor heat conduction and heat dissipation capacity due to its small volume, thereby helping to reduce the risk of excessive temperature of the cutting edge and aggravated wear. At the same time, it also avoids the inability to effectively support and strengthen the cutting edge due to insufficient strength, ensuring the strengthening effect of the stress-bearing ridge 142 on the cutting insert 100, thereby ensuring the impact resistance of the cutting insert 100.

[0083] Combination Figures 1 to 3 In some embodiments of the present invention, the width dimensions of the stress-bearing ridge 142 and the chip-guiding ridge 143 gradually increase and then gradually decrease from the top surface 113 to the front cutting surface 111.

[0084] For example, the raised portion 140 can be divided into three parts in its width direction. One part is formed as a chip guiding ridge 143, another part is formed as a guide groove 141, and yet another part is formed as a stress bearing ridge 142. With a fixed width dimension of the raised portion 140, by making the width dimensions of the stress bearing ridge 142 and the chip guiding ridge 143 gradually increase and then gradually decrease from the top surface 113 to the rake face 111, on the one hand, the width dimension of the guide groove 141 near the rake face 111 can be effectively increased, thereby increasing the chip space of the guide groove 141 near the rake face 111, facilitating chip removal, and preventing chips from directly acting on the rake face 111 corresponding to the cutting edge 133. On the other hand, it helps to ensure the structural strength of the stress bearing ridge 142 and the chip guiding ridge 143, thereby improving the strength of the cutting edge 133, effectively reducing the risk of chipping of the cutting insert 100, and extending the service life of the cutting insert 100.

[0085] Combination Figure 1 , Figure 3 and Figure 5 In some embodiments of the present invention, the stress-bearing ridge 142 includes a first part 1421 and a second part 1422 connected together. From the top surface 113 to the rake face 111, the width of the first part 1421 gradually increases and the width of the second part 1422 gradually decreases. The chip-guiding ridge 143 includes a third part 1431 and a fourth part 1432 connected together. From the top surface 113 to the rake face 111, the width of the third part 1431 gradually increases and the width of the fourth part 1432 gradually decreases. Defined within the same cross section, the width of the first part 1421 is A1 and the width of the third part 1431 is A2, satisfying the relationship: 1≤A1 / A2≤2.

[0086] In the above technical solution, by making the width dimension A1 of the first part 1421 and the width dimension A2 of the second part 1422 satisfy the relationship: 1≤A1 / A2≤2, the structural strength and heat dissipation capacity of the stress-bearing ridge 142 can be guaranteed, and the arrangement space of the guide channel 141 and the third part 1431 can be prevented due to the excessive width dimension of the first part 1421. This allows sufficient arrangement space to be reserved on the raised part 140 for the guide channel 141 and the third part 1431.

[0087] If A1 / A2 < 1, the width of the first part 1421 is too small, which can easily lead to a small volume and thus poor strength. At the same time, it can also cause insufficient heat dissipation capacity of the stress-bearing ridge 142, affecting the heat dissipation efficiency of the cutting insert 100. This will increase the risk of chipping of the cutting insert 100 and shorten its service life.

[0088] If A1 / A2 > 2, the width of the first part 1421 is too large. When the width of the raised part 140 is fixed, the first part 1421 will excessively encroach on the arrangement space of the guide groove 141 and the chip guide ridge 143, resulting in insufficient space on the raised part 140 for arranging the guide groove 141 and the chip guide ridge 143. This will not only easily affect the guiding effect of the guide groove 141 on chips and cutting fluid, but also easily lead to poor strength and heat dissipation capacity of the chip guide ridge 143.

[0089] Combination Figure 1 and Figure 2 In some embodiments of the present invention, at least one of the top wall of the chip guide ridge 143 facing away from the concave direction of the guide groove 141 and the top wall of the stress bearing ridge 142 facing away from the concave direction of the guide groove 141 is formed as a second concave surface 150, the second concave surface 150 extending from the top surface 113 to the rake face 111.

[0090] In some examples, a top wall is formed on the side of the chip guide ridge 143 opposite to the recessed direction of the guide groove 141. The top wall can be recessed into the chip guide ridge 143 in the same direction as the recessed direction of the guide groove 141, so that the top wall is formed as a second concave surface 150. The setting of the second concave surface 150 can effectively increase the area of ​​the chip guide ridge 143, thereby increasing the heat dissipation area of ​​the chip guide ridge 143 and improving the heat dissipation efficiency of the cutting tool 100. In addition, the second concave surface 150 can also guide the chips, which can further improve the smoothness of chip discharge and reduce the risk of chip blockage.

[0091] In other examples, a top wall is formed on the side of the stress-bearing ridge 142 opposite to the concave direction of the guide groove 141. The top wall can be recessed into the stress-bearing ridge 142 in the same direction as the concave direction of the guide groove 141, so that the top wall is formed as a second concave surface 150. The setting of the second concave surface 150 can effectively increase the area of ​​the stress-bearing ridge 142, thereby increasing the heat dissipation area of ​​the stress-bearing ridge 142 and improving the heat dissipation efficiency of the cutting tool 100. In addition, the second concave surface 150 can also guide the chips, which is conducive to further improving the smoothness of chip discharge and reducing the risk of chip blockage.

[0092] In some other examples, a top wall is formed on the side of the chip guide ridge 143 facing away from the concave direction of the guide groove 141, and a top wall is also formed on the side of the stress bearing ridge 142 facing away from the concave direction of the guide groove 141. The top walls of both the chip guide ridge 143 and the stress bearing ridge 142 can be recessed into the stress bearing ridge 142 in the same direction as the concave direction of the guide groove 141, so that the top wall is formed as a second concave surface 150. This increases the area of ​​both the stress bearing ridge 142 and the chip guide ridge 143, thereby increasing the heat dissipation area of ​​both the stress bearing ridge 142 and the chip guide ridge 143. This effectively improves the heat dissipation efficiency of the cutting tool 100 and also effectively improves the smoothness of chip discharge, reducing the risk of chip blockage.

[0093] Combination Figures 2 to 4 In some embodiments of the present invention, the radius of curvature R1 of the second concave surface 150 satisfies the following relationship: 3mm≤R1≤10mm.

[0094] In the above technical solution, by designing the range of values ​​for the radius of curvature R1 of the second concave surface 150, not only can the heat dissipation area be effectively increased, but the structural strength of the stress-bearing ridge 142 and / or chip-guiding ridge 143 provided with the second concave surface 150 can also be guaranteed. This helps to ensure the support effect of the stress-bearing ridge 142 and / or chip-guiding ridge 143 and reduce the risk of damage to the cutting tool 100.

[0095] If R1 < 3mm, the radius of curvature of the second concave surface 150 is too small, that is, the degree of concavity of the second concave surface 150 is too large. This will reduce the structural strength of the stress-bearing ridge 142 and / or the chip-guiding ridge 143 on which the second concave surface 150 is provided, affecting the support effect of the stress-bearing ridge 142 and / or the chip-guiding ridge 143, thereby reducing the structural strength of the cutting tool 100 and increasing the risk of damage to the cutting tool 100.

[0096] If R1 > 10mm, the radius of curvature of the second concave surface 150 is too large, that is, the degree of concavity of the second concave surface 150 is small and the area of ​​the second concave surface 150 is small. This results in a small increase in the heat dissipation area caused by setting the second concave surface 150, which in turn easily leads to a small heat dissipation area of ​​the stress bearing ridge 142 and / or the chip guiding ridge 143, affecting the heat dissipation efficiency of the stress bearing ridge 142 and / or the chip guiding ridge 143, and thus easily affecting the heat dissipation efficiency of the cutting tool 100.

[0097] Combination Figures 2 to 4 In some embodiments of the present invention, the maximum depth of the guide groove 141 is H1, and the maximum depth of the second concave surface 150 is H2, satisfying the relationship: H1 > H2.

[0098] It should be noted that "maximum depth of guide groove 141" refers to the depth dimension of guide groove 141 at the position where it connects with the front cutter face 111 in the direction perpendicular to the top surface 113, and "maximum depth of second concave surface 150" refers to the depth dimension of the lowest point of the second concave surface 150 in the direction perpendicular to the top surface 113.

[0099] In the above technical solution, by designing the maximum depth H1 of the guide groove 141 and the maximum depth H2 of the second concave surface 150 in a related manner, it is beneficial to achieve graded chip breaking and graded chip guiding of the guide groove 141 and the second concave surface 150. Specifically, since H1 > H2, the curling space provided by the guide groove 141 for the chips is greater than that provided by the second concave surface 150 for the chips. The amount of plastic deformation of the chips entering the guide groove 141 is less than that of the chips entering the second concave surface 150. This allows the chips flowing through the guide groove 141 and the second concave surface 150 to have different curling radii to adapt to the curling and breaking requirements of different chips, thus achieving graded chip breaking. At the same time, the deeper guide groove 141 can guide chips with larger curling radii to ensure the directional chip removal of large chips, and the shallower second concave surface 150 can guide chips with smaller curling radii to ensure the directional chip removal of small chips, thereby achieving graded chip guiding.

[0100] In some embodiments of the present invention, the moment of inertia of the cross section of the stress-bearing ridge 142 is I1, and the moment of inertia of the cross section of the chip-guiding ridge 143 is I2, satisfying the relationship: 2.5≤I1 / I2.

[0101] The moment of inertia of a cross section (also known as the second moment of a cross section) is a geometric parameter characterizing the ability of a component's cross-sectional geometry and dimensions to resist bending deformation. The larger the moment of inertia of a cross section, the stronger the ability of the cross section to resist bending deformation. In the above technical solution, by designing the cross-sectional moment of inertia of the stress-bearing ridge 142 and the cross-sectional moment of inertia of the chip-guiding ridge 143 in a related manner, it is possible to ensure the support effect of the stress-bearing ridge 142 and the chip-guiding ridge 143, improve the strength of the cutting insert 100, and also release space for the chip-breaking and chip-removing functions of the chip-guiding ridge 143 by limiting the stiffness of the chip-guiding ridge 143, effectively balancing the strength and chip-breaking performance of the chip-guiding ridge 143.

[0102] In some embodiments of the present invention, a stress buffer gradient region is formed within the stress-bearing ridge 142, and the density of the buffer gradient region gradually decreases from the surface of the stress-bearing ridge 142 to the interior of the stress-bearing ridge 142.

[0103] For example, during the pressing process of the cutting tool 100, the surface powder of the stress-bearing ridge 142 is compressed more, and the compression gradually decreases from the surface of the stress-bearing ridge 142 to the interior of the stress-bearing ridge 142. This results in a higher surface density of the stress-bearing ridge 142 and fewer pores remaining after sintering. This creates a stress buffer gradient region with gradually decreasing density within the stress-bearing ridge 142. The higher the density and the fewer the pores, the higher the strength of the stress-bearing ridge 142. Therefore, by setting a stress buffer gradient region, the surface strength of the stress-bearing ridge 142 can be effectively improved. This not only ensures the wear resistance of the stress-bearing ridge 142, but also effectively achieves lightweight design and reduces the material cost of the cutting tool 100.

[0104] like Figure 7 As shown, the cutting tool 1000 according to an embodiment of the present invention includes a tool body 200 and a cutting insert 100, wherein the cutting insert 100 is the cutting insert 100 described above, and the cutting insert 100 is mounted on the tool body 200.

[0105] For example, the lower wall surface 160 of the cutting insert 100 can be used as the mounting surface of the cutting insert 100 to cooperate with the tool body 200, so that the cutting insert 100 can be positioned and installed with the tool body 200. The cutting insert 100 can be detachably and indexably installed on the tool body 200, which not only facilitates the cutting of the workpiece by the cutting insert 100, but also facilitates the inspection and replacement of the cutting insert 100, reducing the maintenance cost of the cutting tool 1000.

[0106] According to an embodiment of the present invention, the cutting tool 1000 has a raised portion 140 corresponding to the cutting edge 133 at the tool tip and extending from the top surface 113 to the rake face 111. At least a portion of the raised portion 140 is located within the chip breaker groove 112, so that the raised portion 140 can be supported at least between the groove wall of the chip breaker groove 112 and the rake face 111, which effectively improves the structural strength of the cutting insert 100. Furthermore, by forming a guide groove 141 in the raised portion 140, it is beneficial to curl the chips and improve the smoothness of chip discharge, reducing the risk of chip blockage. At the same time, the guide groove 141 can also guide the cutting fluid, thereby effectively improving the cooling efficiency of the cutting insert 100, effectively reducing the risk of chipping or damage to the cutting insert 100, and extending the service life of the cutting insert 100.

[0107] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0108] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A cutting blade, characterized in that, The cutting insert has an upper wall surface (110) and a side wall surface (120) intersecting the upper wall surface (110). At least a portion of the intersection of the upper wall surface (110) and the side wall surface (120) forms a cutting edge. The cutting edge includes at least a main cutting edge (131), a finishing edge (132), and a tip cutting edge (133) connecting the main cutting edge (131) and the finishing edge (132). The tip cutting edge (133) extends in an arc shape. The upper wall surface (110) has a rake face (111), a chip breaker groove (112), and a top surface (113). The chip breaker groove (112) extends along the upper wall surface (110). A top surface (113) is circumferentially arranged around the top surface (113). The chip breaker groove (112) connects the rake face (111) and the top surface (113). The rake face (111) is adjacent to the intersection of the upper wall surface (110) and the side wall surface (120). The upper wall surface (110) is provided with a raised portion (140) corresponding to the cutting edge (133) of the tool tip. At least a portion of the raised portion (140) is located in the chip breaker groove (112). The raised portion (140) extends from the top surface (113) to the rake face (111), and the raised portion (140) is formed with: A flow guide (141) extends from the top surface (113) to the front face (111). The stress-bearing ridge (142) and the chip-guiding ridge (143) are provided. The guide groove (141) is located between the stress-bearing ridge (142) and the chip-guiding ridge (143). Both the stress-bearing ridge (142) and the chip-guiding ridge (143) extend from the top surface (113) to the rake face (111). A portion of the stress-bearing ridge (142) and a portion of the chip-guiding ridge (143) are located within the chip-breaking groove (112). The ratio of the volume V1 of the stress-bearing ridge (142) to the volume V2 of the raised portion (140) satisfies the following relationship: 0.15≤V1 / V2≤0.

25. At least one of the top wall of the chip guide ridge (143) facing away from the concave direction of the guide groove (141) and the top wall of the stress bearing ridge (142) facing away from the concave direction of the guide groove (141) is formed as a second concave surface (150). The second concave surface (150) extends from the top surface (113) to the front face (111). The maximum depth of the guide groove (141) is H1, and the maximum depth of the second concave surface (150) is H2, satisfying the relationship: H1 > H2.

2. The cutting blade according to claim 1, characterized in that, From the top surface (113) to the front blade surface (111), the depth dimension of the guide groove (141) gradually increases, and the width dimension of the guide groove (141) gradually increases.

3. The cutting blade according to claim 1, characterized in that, The guide channel (141) has a bottom wall (1411), and the angle α between the bottom wall (1411) and the extended surface of the top surface (113) satisfies the following relationship: 5°≤α≤30°.

4. The cutting blade according to claim 1, characterized in that, The inner wall (1412) of the guide groove (141) is a first concave surface, and the radius of curvature of the first concave surface gradually increases from the top surface (113) to the front blade surface (111).

5. The cutting blade according to claim 4, characterized in that, The radius of curvature Rc at the position where the first concave surface is adjacent to the top surface (113) and the radius of curvature Rf at the position where the first concave surface is adjacent to the front blade surface (111) satisfy the relationship: 0.1≤Rc / Rf≤0.

6.

6. The cutting blade according to claim 1, characterized in that, The stress-bearing ridge (142) and the chip-guiding ridge (143) participate in defining the groove sidewall (1413) that forms the flow channel (141).

7. The cutting blade according to claim 1, characterized in that, From the top surface (113) to the front face (111), the width of the stress-bearing ridge (142) and the chip-guiding ridge (143) gradually increases and then gradually decreases.

8. The cutting blade according to claim 7, characterized in that, The stress-bearing ridge (142) includes a first part (1421) and a second part (1422) connected together. From the top surface (113) to the rake face (111), the width of the first part (1421) gradually increases and the width of the second part (1422) gradually decreases. The chip-guiding ridge (143) includes a third part (1431) and a fourth part (1432) connected together. From the top surface (113) to the rake face (111), the width of the third part (1431) gradually increases and the width of the fourth part (1432) gradually decreases. Defined within the same cross section, the width dimension of the first part (1421) is A1, and the width dimension of the third part (1431) is A2, satisfying the relationship: 1≤A1 / A2≤2.

9. The cutting blade according to claim 1, characterized in that, The range of the radius of curvature R1 of the second concave surface (150) satisfies the following relationship: 3mm≤R1≤10mm.

10. The cutting blade according to claim 1, characterized in that, The moment of inertia of the cross section of the stress-bearing ridge (142) is I1, and the moment of inertia of the cross section of the chip-guiding ridge (143) is I2, satisfying the relationship: 2.5≤I1 / I2.

11. The cutting blade according to claim 1, characterized in that, A stress buffer gradient region is formed within the stress-bearing ridge (142), and the density of the buffer gradient region gradually decreases from the surface of the stress-bearing ridge (142) to the interior of the stress-bearing ridge (142).

12. A cutting tool, characterized in that, include: Blade body (200); A cutting insert, wherein the cutting insert is any one of claims 1-11, and the cutting insert is mounted on the tool body (200).

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