Double-sided indexable cutting insert and cutting tool

Abstract

The utility model discloses a kind of double-sided indexable cutting inserts and cutting tools, it is related to cutting insert technical field, double-sided indexable cutting insert includes: insert main body, insert main body is formed with two processing faces, each processing face includes mounting surface, and insert main body is equipped with insert mounting hole, the edge of each processing face is formed with two main cutting edges and two auxiliary cutting edges;Wherein, first main rake face is formed between main cutting edge and mounting surface, first main rake face is structured as being inclined to extend downwards along the direction close to mounting surface, the included angle of first main rake face and mounting surface is structured as being reduced from first corner cutting edge to second corner cutting edge.The double-sided indexable cutting insert of the utility model embodiment, the rigidity of main cutting edge can be gradually enhanced to bear greater cutting resistance, and the formation and outflow path of chip can be optimized, the heat generated by friction is reduced, cutting efficiency and the durability of insert main body are balanced, ensure processing precision and surface quality.

Description

Technical Field

[0001] This utility model relates to the field of cutting insert technology, and in particular to a double-sided indexable cutting insert and cutting tool. Background Technology

[0002] With the increasing popularity of high-power spindle machine tools, more and more customers require cutting inserts to meet high cutting parameters (high cutting speed, large feed rate and large depth of cut) so that more metal can be removed per unit time and the machining efficiency can be improved. At the same time, reliable chip breaking and chip removal capabilities are also required, thus placing higher demands on such tools.

[0003] Chip breaking can become difficult at high cutting parameters because the material removal rate increases, and the chips are more likely to form continuous long strips that can easily wrap around the tool or workpiece. At high cutting parameters, the chip generation rate is faster, and if chip removal is not timely, chip accumulation may occur, affecting machining accuracy and tool life.

[0004] In machining, especially in CNC machine tools, a single rake angle can easily lead to chip accumulation and thermal cracking. Typically, cutting tools used to machine right-angle steps, square shoulders, or sidewalls on workpieces are single-sided, and the cutting inserts are expensive. When machining right-angle edges, the cutting inserts must withstand large mechanical and thermal stresses, and the cutting edge is prone to local failure, which in turn leads to roughness of the machined surface. There is room for improvement. Utility Model Content

[0005] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a double-sided indexable cutting insert. The double-sided indexable cutting insert allows for double-sided indexable mounting of the insert body, reducing the cost of the insert body, extending its service life, and gradually increasing the rigidity of the main cutting edge with increasing depth of cut to withstand greater cutting resistance and prevent chipping. Simultaneously, it optimizes chip formation and flow paths, reducing heat generated by friction. Especially when machining high-hardness materials or performing large-mass cutting, it balances cutting efficiency with the durability of the insert body, ensuring dimensional accuracy and surface quality.

[0006] A double-sided indexable cutting insert according to an embodiment of the present invention includes: an insert body, the insert body having two mutually opposing machining faces, each machining face including a mounting surface, and the insert body having insert mounting holes extending through the two mounting surfaces; each machining face having two main cutting edges distributed along a first direction and two secondary cutting edges distributed along a second direction at its edge; wherein, a first angular cutting edge is formed between each main cutting edge and one of the secondary cutting edges and a second angular cutting edge is formed between each main cutting edge and the other secondary cutting edge; a first main rake face is formed between the main cutting edge and the mounting surface; the first main rake face is configured to extend downwardly at an angle close to the mounting surface; the angle between the first main rake face and the mounting surface is configured to decrease along the second direction from the first angular cutting edge to the second angular cutting edge.

[0007] According to the embodiments of the present invention, the double-sided indexable cutting insert has two main cutting edges distributed along a first direction and two secondary cutting edges distributed along a second direction at the edge of each machining face. This enables double-sided indexable mounting of the insert body, reducing the cost of the insert body and extending its service life. Furthermore, by constructing the angle between the first main rake face and the mounting surface to decrease from the first corner cutting edge to the second corner cutting edge, the rigidity of the main cutting edge can be gradually enhanced as the depth of cut increases to withstand greater cutting resistance and avoid chipping. At the same time, the change in the angle between the first main rake face and the mounting surface can optimize the chip formation and flow path, reducing the heat generated by friction. Especially when machining high-hardness materials or performing large-margin cutting, it can balance cutting efficiency and insert body durability, ensuring dimensional accuracy and surface quality.

[0008] According to an embodiment of the present invention, a double-sided indexable cutting insert is provided, wherein a second main rake face is formed between the first main rake face and the mounting surface. The second main rake face is configured to extend downward at an angle close to the mounting surface, and the included angle between the second main rake face and the mounting surface is configured to first decrease and then increase along the second direction from the first corner cutting edge to the second corner cutting edge.

[0009] According to an embodiment of the present invention, the main cutting edge is configured to extend outward and then inward along the second direction from the first corner cutting edge toward the second corner cutting edge, so that the middle part of the main cutting edge protrudes outward relative to both ends; and / or, the height of the main cutting edge protruding relative to the mounting surface is configured to decrease first and then increase along the second direction from the first corner cutting edge to the second corner cutting edge.

[0010] According to an embodiment of the present invention, the double-sided indexable cutting insert includes a first secondary cutting edge and a second secondary cutting edge connected sequentially along the first direction, wherein either the first secondary cutting edge or the second secondary cutting edge is configured to bulge outward and tilt in a direction closer to the other.

[0011] According to an embodiment of the present invention, a double-sided indexable cutting insert has a first secondary rake face and a first secondary chip-returning face sequentially disposed between the first secondary cutting edge and the mounting surface, wherein both the first secondary rake face and the first secondary chip-returning face are configured to extend downward at an incline close to the mounting surface; and / or, a second secondary rake face and a second secondary chip-returning face are sequentially disposed between the second secondary cutting edge and the mounting surface, wherein both the second secondary rake face and the second secondary chip-returning face are configured to extend downward at an incline close to the mounting surface.

[0012] According to an embodiment of the present invention, a double-sided indexable cutting insert has a first secondary cutting edge connected to a first corner cutting edge, a second secondary cutting edge connected to a second corner cutting edge, a first corner rake face and a first corner chip-returning surface sequentially disposed between the first corner cutting edge and the mounting surface, both the first corner rake face and the first corner chip-returning surface being configured to extend downward at an inclination close to the mounting surface; and a second corner rake face and a second corner chip-returning surface sequentially disposed between the second corner cutting edge and the mounting surface, both the second corner rake face and the second corner chip-returning surface being configured to extend downward at an inclination close to the mounting surface.

[0013] According to an embodiment of the present invention, a double-sided indexable cutting insert has a second primary rake face, a second secondary chip-returning face, a second corner chip-returning face, and a mounting surface that together define a chip-returning area. The chip-returning area and the mounting surface are configured such that their heights gradually decrease in the second direction from the second corner cutting edge to the first corner cutting edge.

[0014] According to one embodiment of the present invention, the distance between the secondary cutting edge and the mounting surface of the double-sided indexable cutting insert is configured such that the distance decreases and then increases along the first direction from the first corner cutting edge to the second corner cutting edge.

[0015] According to one embodiment of the present invention, the two first corner cutting edges of each machining face are arranged in a centrally symmetrical manner; and / or, the two second corner cutting edges of each machining face are arranged in a centrally symmetrical manner; and / or, the two machining faces are arranged in a centrally symmetrical manner.

[0016] This utility model also proposes a cutting tool.

[0017] The cutting tool according to the present invention includes a tool holder and a double-sided indexable cutting insert as described in any of the above embodiments.

[0018] The cutting tool and the aforementioned double-sided indexable cutting insert have the same advantages over the prior art, which will not be elaborated here.

[0019] Additional aspects and advantages of this 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

[0020] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of a double-sided indexable cutting insert according to an embodiment of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of a double-sided indexable cutting insert according to an embodiment of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the structure of a double-sided indexable cutting insert according to an embodiment of the present invention. Figure 3 ; Figure 4 yes Figure 3 Schematic diagram of the cross section at the BT-BT point; Figure 5 yes Figure 3 Schematic diagram of the cross section at BS-BS; Figure 6 yes Figure 3 Schematic diagram of the cross section at the BU-BU junction; Figure 7 yes Figure 3 Schematic diagram of the cross section at BO-BO; Figure 8 yes Figure 3 Schematic diagram of the cross section at BL-BL; Figure 9 yes Figure 3 Schematic diagram of the cross section at BM-BM; Figure 10 yes Figure 3 Schematic diagram of the cross section at BQ-BQ; Figure 11 yes Figure 3 A schematic diagram of the cross section at BP-BP.

[0021] Figure label: 100 double-sided indexable cutting inserts Blade body 1, mounting surface 11, blade mounting hole 12, transverse side 13, longitudinal side 14, corner side 15. Main cutting edge 2, first main rake face 21, second main rake face 22, secondary cutting edge 3, first secondary cutting edge 31, first secondary rake face 311, first secondary chip-reducing face 312, second secondary cutting edge 32, second secondary rake face 321, second secondary chip-reducing face 322. First corner cutting edge 4, first corner rake face 41, first corner chip removal surface 42, second corner cutting edge 5, second corner rake face 51, second corner chip removal surface 52, chip removal zone 6. Detailed Implementation

[0022] The embodiments of this utility model 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 this utility model, and should not be construed as limiting this utility model.

[0023] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model 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 this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 utility model based on the specific circumstances.

[0025] The following is for reference. Figures 1-11The double-sided indexable cutting insert 100 according to the present invention enables double-sided indexable mounting of the insert body 1, reducing the cost of the insert body 1, extending the service life of the insert body 1, and gradually increasing the rigidity of the main cutting edge 2 with the increase of the depth of cut to withstand greater cutting resistance and avoid chipping. At the same time, it can optimize the formation and flow path of chips and reduce the heat generated by friction. Especially when machining high-hardness materials or performing large-margin cutting, it can balance cutting efficiency and the durability of the insert body 1, ensuring the dimensional accuracy and surface quality of the machining.

[0026] like Figures 1-3 As shown, a double-sided indexable cutting insert 100 according to an embodiment of the present invention includes: an insert body 1.

[0027] The insert body 1 has two mutually opposing machining faces, each of which includes a mounting surface 11. The insert body 1 is provided with insert mounting holes 12 that extend through the two mounting surfaces 11. At the edge of each machining face, there are two main cutting edges 2 distributed along a first direction and two secondary cutting edges 3 distributed along a second direction. A first corner cutting edge 4 is formed between each main cutting edge 2 and one secondary cutting edge 3, and a second corner cutting edge 5 is formed between each main cutting edge 2 and another secondary cutting edge 3. A first main rake face 21 is formed between the main cutting edge 2 and the mounting surface 11. The first main rake face 21 is constructed to extend downward at an angle close to the mounting surface 11. The angle between the first main rake face 21 and the mounting surface 11 is constructed to decrease along the second direction from the first corner cutting edge 4 to the second corner cutting edge 5.

[0028] Specifically, the insert body 1 serves as the base of the double-sided indexable cutting insert 100, and is used to set the cutting edge and support the cutting edge so as to reliably cut the workpiece through the cutting edge and realize the cutting function. The insert body 1 has a machining face, and two main cutting edges 2 and two secondary cutting edges 3 are formed at the edge of the machining face. The main cutting edge 2 has a larger cutting force and undertakes the main cutting task in the cutting process. The secondary cutting edge 3 has a smaller cutting force and is used for auxiliary cutting. The two main cutting edges 2 and the two secondary cutting edges 3 are distributed along the first direction and the second direction respectively. The two main cutting edges 2 and the two secondary cutting edges 3 can be staggered at the edge of the machining face, that is, the two sets of main cutting edges 2 and secondary cutting edges 3 are distributed alternately.

[0029] In this way, one set of main cutting edges 2 and secondary cutting edges 3 can be selectively used to cut the workpiece, thus realizing the indexable installation of the insert body 1. When one set of main cutting edges 2 and secondary cutting edges 3 is damaged or overheated, the installation direction of the insert body 1 on the tool holder can be adjusted to install the other set of main cutting edges 2 and secondary cutting edges 3 toward the workpiece, and the cutting process can continue using the other set of main cutting edges 2 and secondary cutting edges 3. This can reduce the cost of the insert body 1 and extend its service life.

[0030] like Figures 1-3 As shown, the insert body 1 can be constructed as a cuboid, with the first direction being the width direction of the insert body 1 and the second direction being the length direction of the insert body 1. In this way, the main cutting edge 2 can have a certain length along the second direction, and the secondary cutting edge 3 can have a certain length along the first direction. This increases the length of the main cutting edge 2 and the secondary cutting edge 3, making the insert body 1 adaptable to cutting conditions with large depth of cut and large feed, and increasing the applicability of the insert body 1.

[0031] Furthermore, since the two machining faces are set opposite to each other, the main cutting edge 2 and the secondary cutting edge 3 on the two machining faces are spaced apart. In this way, the main cutting edge 2 and the secondary cutting edge 3 on one of the machining faces can be selectively used to cut the workpiece. This enables the double-sided indexable mounting of the insert body 1. If both sets of main cutting edges 2 and secondary cutting edges 3 on one of the machining faces are damaged or overheated, the insert body 1 can be flipped and mounted with the other machining face facing the workpiece. The cutting process can then continue using the main cutting edge 2 and the secondary cutting edge 3 on the other machining face. This can further reduce the cost of the insert body 1 and extend its service life.

[0032] It should be noted that, as Figures 1-3 As shown, two transverse side surfaces 13 distributed along a first direction and two longitudinal side surfaces 14 distributed along a second direction are connected between the two machining tool faces. That is, the transverse side surfaces 13 and the longitudinal side surfaces 14 can support the two machining tool faces and improve the overall rigidity. In this way, the main cutting edge 2 can be formed at the intersection of the machining tool face and the transverse side surface 13, and the secondary cutting edge 3 can be formed at the intersection of the machining tool face and the longitudinal side surface 14. The two machining tool faces can be separated by the transverse side surfaces 13 and the longitudinal side surfaces 14 to ensure that the double-sided indexable mounting of the insert body 1 is possible. A corner side surface 15 is connected between each transverse side surface 13 and the longitudinal side surface 14. The corner side surface 15 is used to form a smooth transition between the transverse side surface 13 and the longitudinal side surface 14.

[0033] Meanwhile, each machining facet includes a mounting surface 11, which is used to set the blade mounting hole 12. The blade mounting hole 12 is used to install the blade body 1 on the tool holder. By extending the blade mounting hole 12 through the blade body 1 to both mounting surfaces 11, the blade mounting hole 12 can be extended from one mounting surface 11 through the blade body 1 to the other mounting surface 11. In other words, the blade mounting hole 12 can be constructed as a through hole, so that the blade body 1 can be installed from either mounting surface 11. This allows for selective installation of any machining facet toward the workpiece.

[0034] It should be noted that, as Figures 1-3 As shown, the mounting surface 11 can be set in the middle of the machining face, and the blade mounting hole 12 can be set in the middle of the mounting surface 11, so that the blade mounting hole 12 can be set in the middle of the blade body 1, thereby improving the installation stability of the blade body 1.

[0035] In this design, a first angular cutting edge 4 is formed between each main cutting edge 2 and a secondary cutting edge 3, and a second angular cutting edge 5 is formed between each main cutting edge 2 and another secondary cutting edge 3. The first angular cutting edge 4 and the second angular cutting edge 5 are connected to both ends of the main cutting edge 2, respectively. Thus, the main cutting edge 2 can be connected to the two secondary cutting edges 3 through the first angular cutting edge 4 and the second angular cutting edge 5. The first angular cutting edge 4 and the second angular cutting edge 5 can serve as transition areas between the main cutting edge 2 and the two secondary cutting edges 3, respectively, to smoothly connect the cutting forces of the main cutting edge 2 and the secondary cutting edges 3, avoid vibration caused by sudden changes in cutting force, and improve the stability of machining.

[0036] Furthermore, a first main rake face 21 is formed between the main cutting edge 2 and the mounting surface 11. The first main rake face 21 is connected to the main cutting edge 2 and extends along the extension direction of the main cutting edge 2, allowing it to directly contact the bottom layer of the chip. Through friction and compression, the chip is deformed. By configuring the first main rake face 21 to extend downwards in a direction close to the mounting surface 11, the setting height of the mounting surface 11 can be lower than that of the main cutting edge 2, thus creating a certain angle between the first main rake face 21 and the mounting surface 11. The angle between the first main rake face 21 and the mounting surface 11 is designed to decrease from the first corner cutting edge 4 to the second corner cutting edge 5. This means that in the direction along the second direction from the first corner cutting edge 4 to the second corner cutting edge 5, the angle between the first main rake face 21 and the mounting surface 11 is maximized near the first corner cutting edge 4, which increases the cutting force of the main cutting edge 2. The angle between the first main rake face 21 and the mounting surface 11 is minimized near the second corner cutting edge 5, which increases the rigidity of the main cutting edge 2.

[0037] Furthermore, the angle between the first main rake face 21 and the mounting surface 11 can be gradually reduced or gradient-reduced along the second direction from the first corner cutting edge 4 to the second corner cutting edge 5. This allows the rigidity of the main cutting edge 2 to be gradually or gradient-reinforced along the second direction from the first corner cutting edge 4 to the second corner cutting edge 5. That is, as the depth of cut increases, the rigidity of the main cutting edge 2 can be gradually increased to withstand greater cutting resistance and prevent chipping. Simultaneously, the change in the angle between the first main rake face 21 and the mounting surface 11 optimizes chip formation and flow paths, reducing heat generated by friction. Especially when machining high-hardness materials or performing large-margin cutting, it can balance cutting efficiency and the durability of the insert body 1, ensuring dimensional accuracy and surface quality. It should be noted that the vertical direction is the thickness direction of the insert body 1.

[0038] In such Figures 3-7 In the embodiment shown, the insert body 1 can be partially sectioned at four positions: BT-BT, BS-BS, BU-BU, and BO-BO, along the second direction from the first corner cutting edge 4 to the second corner cutting edge 5. The angle between the first main rake face 21 and the mounting surface 11 at the BT-BT section can be set as β1, the angle at the BS-BS section as β2, the angle at the BU-BU section as β3, and the angle at the BO-BO section as β4, where β1 > β2 ≥ β3 ≥ β4. This allows the angle between the first main rake face 21 and the mounting surface 11 to gradually decrease or gradient decrease along the second direction from the first corner cutting edge 4 to the second corner cutting edge 5.

[0039] According to the embodiment of the present invention, the double-sided indexable cutting insert 100, by forming two main cutting edges 2 distributed along a first direction and two secondary cutting edges 3 distributed along a second direction at the edge of each machining face, enables double-sided indexable mounting of the insert body 1, reduces the cost of the insert body 1, and extends the service life of the insert body 1. Furthermore, by constructing the angle between the first main rake face 21 and the mounting surface 11 to decrease from the first corner cutting edge 4 to the second corner cutting edge 5, the rigidity of the main cutting edge 2 can be gradually enhanced as the depth of cut increases to withstand greater cutting resistance and avoid chipping. At the same time, the change in the angle between the first main rake face 21 and the mounting surface 11 can optimize the formation and flow path of chips, reduce the heat generated by friction, and especially when machining high-hardness materials or performing large-margin cutting, it can balance cutting efficiency and the durability of the insert body 1, ensuring the dimensional accuracy and surface quality of the machining.

[0040] In some embodiments, a second main rake face 22 is formed between the first main rake face 21 and the mounting surface 11. The second main rake face 22 is configured to extend downward at an angle close to the mounting surface 11. The included angle between the second main rake face 22 and the mounting surface 11 is configured to decrease first and then increase along a second direction from the first corner cutting edge 4 to the second corner cutting edge 5.

[0041] Specifically, the second main rake face 22 is connected to the first main rake face 21, and can further deform the chip through friction and compression. The second main rake face 22 is constructed to extend downwards along the direction close to the mounting surface 11, so that there is a certain angle between the first main rake face 21 and the mounting surface 11. The angle between the second main rake face 22 and the mounting surface 11 is constructed to decrease first and then increase along the second direction from the first corner cutting edge 4 to the second corner cutting edge 5. This makes the angle between the second main rake face 22 and the mounting surface 11 larger near the first corner cutting edge 4, which can reduce the chip curl radius, improve the chip removal direction, and increase the chip removal space. Furthermore, the angle between the second main rake face 22 and the mounting surface 11 gradually increases or gradients in the part away from the first corner cutting edge 4, which can slow down the chip flow rate, prevent chip accumulation in the machining area, reduce cutting vibration, and improve the surface finish of the workpiece.

[0042] In such Figures 3-7 In the embodiment shown, the insert body 1 can be partially sectioned at four positions: BT-BT, BS-BS, BU-BU, and BO-BO, along the second direction from the first corner cutting edge 4 to the second corner cutting edge 5. The angle between the second main rake face 22 and the mounting surface 11 at the BT-BT section can be set as γ1, the angle at the BS-BS section as γ2, the angle at the BU-BU section as γ3, and the angle at the BO-BO section as γ4, where γ4≥γ3≥γ1≥γ2. This allows the angle between the second main rake face 22 and the mounting surface 11 to first decrease and then increase along the second direction from the first corner cutting edge 4 to the second corner cutting edge 5.

[0043] In some embodiments, the main cutting edge 2 is configured to extend outward and then inward along a second direction from the first corner cutting edge 4 toward the second corner cutting edge 5, so that the middle part of the main cutting edge 2 protrudes outward relative to both ends; and / or, the height of the main cutting edge 2 protruding relative to the mounting surface 11 is configured to decrease first and then increase along the second direction from the first corner cutting edge 4 to the second corner cutting edge 5.

[0044] Specifically, the main cutting edge 2 is constructed such that it extends outward and then inward along the second direction from the first corner cutting edge 4 toward the second corner cutting edge 5. This means the main cutting edge 2 can be constructed such that it extends away from the insert body 1 and then closer to the insert body 1 along the second direction from the first corner cutting edge 4 to the second corner cutting edge 5. This allows the middle part of the main cutting edge 2 to bulge outward relative to its two ends, thus enabling the main cutting edge 2 to extend irregularly. For example, the main cutting edge 2 can be constructed as an arc-shaped cutting edge. Through continuously changing curvature, the contact area between the main cutting edge 2 and the workpiece gradually changes, reducing the pressure peak per unit area and thus lowering the cutting force. Especially when machining high-hardness materials, this can significantly extend the service life of the insert body 1.

[0045] Furthermore, the first main rake face 21 is connected to the main cutting edge 2. The irregular extension of the first main rake face 21 can make the first main rake face 21 extend irregularly. In this way, the irregular structure of the first main rake face 21 can better ensure the low cutting force and the guiding effect of the chip formation direction, guide the chips to be discharged in a specific direction, avoid the chips from interfering with the machining area or damaging the machined surface, and also ensure the need for a stronger cutting edge when the depth of cut is large, reduce friction and resistance during the cutting process, improve cutting efficiency, reduce the vibration of the insert body 1, and extend the service life of the insert body 1.

[0046] Furthermore, the height of the main cutting edge 2 protruding relative to the mounting surface 11 can be configured such that it first decreases and then increases along the second direction from the first corner cutting edge 4 to the second corner cutting edge 5. That is, along the second direction from the first corner cutting edge 4 to the second corner cutting edge 5, the height of the main cutting edge 2 protruding relative to the mounting surface 11 is maximized near the first corner cutting edge 4. Typically, the connection area between the main cutting edge 2 and the first corner cutting edge 4 is the tip portion, where the main cutting edge 2 needs to withstand the maximum instantaneous cutting load. By increasing the height of the main cutting edge 2 protruding relative to the mounting surface 11, the cross-sectional area of ​​the insert body 1 at this location can be increased, improving the resistance to plastic deformation of the main cutting edge 2. By gradually increasing the height of the main cutting edge 2 protruding relative to the mounting surface 11 near the second corner cutting edge 5, the coordination of bending stiffness under cutting force can be ensured, making the cutting force more evenly distributed along the extension direction of the main cutting edge 2, and reducing surface waviness.

[0047] Meanwhile, in the middle of the main cutting edge 2, the protrusion height of the main cutting edge 2 relative to the mounting surface 11 is gradually reduced, which can form a smooth transition between the part near the first corner cutting edge 4 and the part near the second corner cutting edge 5, so that the stress distribution is gentle, the continuity of cutting force is ensured, the impact load during the machining process is reduced, and the machining stability is improved.

[0048] In such Figures 3-7In the embodiment shown, the insert body 1 can be partially sectioned at four positions: BT-BT, BS-BS, BU-BU, and BO-BO, along the second direction from the first corner cutting edge 4 to the second corner cutting edge 5. The protrusion height of the main cutting edge 2 relative to the mounting surface 11 can be set as S1 at the BT-BT section, S2 at the BS-BS section, S3 at the BU-BU section, and S4 at the BO-BO section, where S1 > S2 ≥ S3 and S4 ≥ S3. This allows the protrusion height of the main cutting edge 2 relative to the mounting surface 11 to first decrease and then increase along the second direction from the first corner cutting edge 4 to the second corner cutting edge 5.

[0049] In some embodiments, the secondary cutting edge 3 includes a first secondary cutting edge 31 and a second secondary cutting edge 32 connected sequentially along a first direction, and either the first secondary cutting edge 31 or the second secondary cutting edge 32 is configured to bulge outward and tilt in a direction closer to the other.

[0050] Specifically, the secondary cutting edge 3 includes a first secondary cutting edge 31 and a second secondary cutting edge 32. The first secondary cutting edge 31 and the second secondary cutting edge 32 are connected sequentially along a first direction, which increases the length of the secondary cutting edge 3. Furthermore, if either the first secondary cutting edge 31 or the second secondary cutting edge 32 is constructed to protrude outwards in a direction closer to the other, both the first secondary cutting edge 31 and the second secondary cutting edge 32 can be extended at an angle relative to the first direction. In other words, both the first secondary cutting edge 31 and the second secondary cutting edge 32 can be constructed to protrude outwards in a direction closer to each other, and a smooth transition can be made at the connection between the two. As a result, the cutting force can be evenly distributed along the length direction of the secondary cutting edge 3, avoiding excessive load per unit length and reducing the possibility of deformation and chipping of the secondary cutting edge 3.

[0051] In some embodiments, a first secondary rake face 311 and a first secondary chip-returning face 312 are sequentially disposed between the first secondary cutting edge 31 and the mounting surface 11, and both the first secondary rake face 311 and the first secondary chip-returning face 312 are configured to extend downward at an incline in the direction close to the mounting surface 11; and / or, a second secondary rake face 321 and a second secondary chip-returning face 322 are sequentially disposed between the second secondary cutting edge 32 and the mounting surface 11, and both the second secondary rake face 321 and the second secondary chip-returning face 322 are configured to extend downward at an incline in the direction close to the mounting surface 11.

[0052] Specifically, a first rake face 311 and a first chip-reducing face 312 are sequentially arranged between the first secondary cutting edge 31 and the mounting surface 11. The first secondary rake face 311 and the first secondary chip-reducing face 312 are sequentially connected between the first secondary cutting edge 31 and the mounting surface 11. Both the first secondary rake face 311 and the first secondary chip-reducing face 312 are constructed to extend downwards at an angle close to the mounting surface 11. This makes the mounting surface 11 lower than the first secondary cutting edge 31, and allows both the first secondary rake face 311 and the first secondary chip-reducing face 312 to have a certain angle with the mounting surface 11, which can promote chip deformation and improve chip breaking ability.

[0053] Meanwhile, a second rake face 321 and a second chip-returning face 322 can be sequentially arranged between the second cutting edge 32 and the mounting surface 11. The second rake face 321 and the second chip-returning face 322 are sequentially connected between the second cutting edge 32 and the mounting surface 11. Both the second rake face 321 and the second chip-returning face 322 are constructed to extend downwards along the direction close to the mounting surface 11, so that the setting height of the mounting surface 11 is lower than that of the second cutting edge 32. This also allows the second rake face 321 and the second chip-returning face 322 to have a certain angle with the mounting surface 11, which can promote chip deformation and improve chip breaking ability.

[0054] In some embodiments, a first secondary cutting edge 31 is connected to a first corner cutting edge 4, and a second secondary cutting edge 32 is connected to a second corner cutting edge 5. A first corner rake face 41 and a first corner chip-returning face 42 are sequentially provided between the first corner cutting edge 4 and the mounting surface 11. Both the first corner rake face 41 and the first corner chip-returning face 42 are configured to extend downward at an incline in the direction close to the mounting surface 11. In addition, a second corner rake face 51 and a second corner chip-returning face 52 are sequentially provided between the second corner cutting edge 5 and the mounting surface 11. Both the second corner rake face 51 and the second corner chip-returning face 52 are configured to extend downward at an incline in the direction close to the mounting surface 11.

[0055] Specifically, the first secondary cutting edge 31 is connected to the first corner cutting edge 4, and the second secondary cutting edge 32 is connected to the second corner cutting edge 5. This allows the two ends of the secondary cutting edge 3 to be connected to the two main cutting edges 2 through the first corner cutting edge 4 and the second corner cutting edge 5, so that the first corner cutting edge 4 and the second corner cutting edge 5 can form a transition area between the two main cutting edges 2 and the secondary cutting edge 3, so as to form a smooth transition of cutting force and avoid chipping.

[0056] Meanwhile, a first corner rake face 41 and a first corner chip-returning face 42 are sequentially arranged between the first corner cutting edge 4 and the mounting surface 11. The first corner rake face 41 and the first corner chip-returning face 42 are sequentially connected between the first corner cutting edge 4 and the mounting surface 11. Both the first corner rake face 41 and the first corner chip-returning face 42 are constructed to extend downwards along the direction close to the mounting surface 11, so that the setting height of the mounting surface 11 is lower than that of the first corner cutting edge 4. This also allows the first corner rake face 41 and the first corner chip-returning face 42 to have a certain angle with the mounting surface 11, which can promote chip deformation and improve chip breaking ability.

[0057] Furthermore, a second corner rake face 51 and a second corner chip-returning face 52 are sequentially arranged between the second corner cutting edge 5 and the mounting surface 11. This allows the second corner rake face 51 and the second corner chip-returning face 52 to be sequentially connected between the second corner cutting edge 5 and the mounting surface 11. Both the second corner rake face 51 and the second corner chip-returning face 52 are constructed to extend downwards at an angle close to the mounting surface 11. This ensures that the mounting surface 11 is positioned at a height lower than the second corner cutting edge 5, and that both the second corner rake face 51 and the second corner chip-returning face 52 have a certain angle with the mounting surface 11. This promotes chip deformation and improves chip-breaking ability.

[0058] In some embodiments, the second primary rake face 22, the second secondary chip-returning face 322, the second corner chip-returning face 52, and the mounting face 11 together define the chip-returning area 6. The height of the chip-returning area 6 and the mounting face 11 in the vertical direction is configured to gradually decrease in the second direction from the second corner cutting edge 5 to the first corner cutting edge 4.

[0059] Specifically, a chip removal zone 6 can be defined in the area near the second corner cutting edge 5 by the second main rake face 22, the second secondary chip removal surface 322, the second corner chip removal surface 52, and the mounting surface 11. The chip removal zone 6 is used to change the flow direction of the chips, so that the chips can quickly detach from the insert body 1 and the workpiece surface, avoiding chip accumulation that could cause wear on the insert body 1 or scratches on the workpiece. In addition, the chip removal zone 6 can increase the chip removal path and reduce chip accumulation, thereby increasing the durability of the insert body 1. Moreover, the chip removal zone 6 is constructed to be concave downward relative to the mounting surface 11. The chip return zone 6 and the mounting surface 11 are configured such that their heights in the vertical direction gradually decrease in the second direction away from the second corner cutting edge 5. This allows the depth of the chip return zone 6 to gradually decrease in the second direction from the position near the second corner cutting edge 5 toward the position near the first corner cutting edge 4. This also allows the bottom of the chip return zone 6 to spirally rise in the second direction from the position near the second corner cutting edge 5 toward the position near the first corner cutting edge 4, forming a spirally rising chip removal channel. This facilitates better chip curling and removal, reducing the risk of chip blockage.

[0060] In such Figures 3-7 In the embodiment shown, the insert body 1 can be partially sectioned at two positions, BO-BO and BU-BU, along the second direction from the second corner cutting edge 5 to the first corner cutting edge 4. The height of the bottom of the chip return zone 6 and the mounting surface 11 in the vertical direction can be set as N1 at the BU-BU section and N2 at the BO-BO section, and N2 > N1. That is, in the direction from the second corner cutting edge 5 to the first corner cutting edge 4, the further away from the second corner cutting edge 5, the smaller the height of the bottom of the chip return zone 6 and the mounting surface 11 in the vertical direction, so that the chip return zone 6 can be a chip removal channel with a helical helix angle.

[0061] In some embodiments, the distance between the secondary cutting edge 3 and the mounting surface 11 is configured to decrease first and then increase along a first direction from the first corner cutting edge 4 to the second corner cutting edge 5.

[0062] Specifically, the distance between the secondary cutting edge 3 and the mounting surface 11 is configured such that it first decreases and then increases along the first direction from the first corner cutting edge 4 to the second corner cutting edge 5. This ensures that the distance between the secondary cutting edge 3 and the mounting surface 11 decreases and then increases from the end of the first secondary cutting edge 31 near the first corner cutting edge 4 to the middle region and then to the second secondary cutting edge 32. This maximizes the distance between the secondary cutting edge 3 and the mounting surface 11 near the first corner cutting edge 4, increasing the support thickness of the overhanging portion of the secondary cutting edge 3 at this location, improving rigidity and vibration resistance, thereby suppressing cutting vibration and ensuring the perpendicularity and surface finish of the machined surface. Furthermore, it can form a wider chip removal channel, avoiding chip accumulation that could lead to secondary cutting or scratching of the machined surface. At the same time, it can increase the penetration space of the coolant, accelerate heat dissipation in the tool tip area, and reduce thermal deformation and wear. The distance from the secondary cutting edge 3 to the mounting surface 11 gradually decreases or gradients along the first direction from the first corner cutting edge 4 to the first half of the second corner cutting edge 5, which can differentiate the cutting force. When the secondary cutting edge 3 is near the first corner cutting edge 4 and bears the maximum load, the stress can be dispersed by a thicker support base, with the middle area being less affected. The second secondary cutting edge 32 can assist in cutting and improve chip breaking ability, avoiding local overload.

[0063] Furthermore, by increasing the distance between the second cutting edge 32 and the mounting surface 11 along the first direction from the direction closer to the first corner cutting edge 4 to the direction closer to the second corner cutting edge 5, the chips can be better curled and discharged.

[0064] In such Figure 3 and Figures 8-11In the embodiment shown, the insert body 1 can be partially sectioned at four positions: BL-BL, BM-BM, BQ-BQ, and BP-BP, along the first direction from the first corner cutting edge 4 to the second corner cutting edge 5. The distance between the secondary cutting edge 3 and the mounting surface 11 can be set to H5 at the BL-BL section, H6 at the BM-BM section, H7 at the BQ-BQ section, and H8 at the BP-BP section, with H5 > H6 > H7 and H8 > H7. Thus, the distance between the secondary cutting edge 3 and the mounting surface 11 can be configured to decrease first and then increase along the first direction from the first corner cutting edge 4 to the second corner cutting edge 5.

[0065] In some embodiments, the two first corner cutting edges 4 of each machining face are arranged in a centrally symmetrical manner; and / or, the two second corner cutting edges 5 of each machining face are arranged in a centrally symmetrical manner; and / or, the two machining faces are arranged in a centrally symmetrical manner.

[0066] Specifically, the two first corner cutting edges 4 on each machining face are arranged in a centrally symmetrical manner, and the two second corner cutting edges 5 on each machining face are arranged in a centrally symmetrical manner. Thus, the insert body 1 can be constructed as a centrally symmetrical structure. In the event that one set of main cutting edges 2 and secondary cutting edges 3 is damaged or overheated, the insert body 1 can be removed, rotated 180° around the axis of the insert mounting hole 12, and reinstalled. The cutting process can then be continued using the other set of main cutting edges 2 and secondary cutting edges 3. This achieves indexable installation of the insert body 1, reduces the cost of the insert body 1, and helps extend the service life of the insert body 1.

[0067] Furthermore, the two machining faces can be arranged in a centrally symmetrical manner, thereby constructing the insert body 1 as a centrally symmetrical structure. This allows the insert body 1 to be centrally symmetrical with respect to its own length, width, or thickness axis. Consequently, when both sets of main cutting edges 2 and secondary cutting edges 3 on one of the machining faces are damaged or overheated, the insert body 1 can be removed and installed in a flipped position relative to its own axis. The cutting process can then continue using the main cutting edges 2 and secondary cutting edges 3 on the other machining face. This enables double-sided indexable installation of the insert body 1, further reducing the cost of the insert body 1 and extending its service life.

[0068] This utility model also proposes a cutting tool.

[0069] The cutting tool according to an embodiment of the present invention includes a tool holder and a double-sided indexable cutting insert 100 of any of the above embodiments. By forming two main cutting edges 2 distributed along a first direction and two secondary cutting edges 3 distributed along a second direction at the edge of each machining face, double-sided indexable mounting of the insert body 1 can be achieved, reducing the cost of the insert body 1, extending the service life of the insert body 1, and the angle between the first main rake face 21 and the mounting surface 11 is configured to decrease from the first corner cutting edge 4 to the second corner cutting edge 5.

[0070] Furthermore, the included angle between the second main rake face 22 and the mounting surface 11 is configured such that it first decreases and then increases along the second direction from the first corner cutting edge 4 to the second corner cutting edge 5. The height of the main cutting edge 2 protruding relative to the mounting surface 11 is configured such that it first decreases and then increases along the second direction from the first corner cutting edge 4 to the second corner cutting edge 5. The height of the chip return zone 6 and the mounting surface 11 in the vertical direction is configured such that it gradually decreases along the second direction from the second corner cutting edge 5 to the first corner cutting edge 4. The distance between the secondary cutting edge 3 and the mounting surface 11 is configured such that it first decreases and then increases along the first direction from the first corner cutting edge 4 to the second corner cutting edge 5. This gradually enhances the rigidity of the main cutting edge 2 to withstand greater cutting resistance, avoids chipping, optimizes the formation and flow path of chips, reduces the heat generated by friction, balances cutting efficiency and the durability of the insert body 1, and ensures the dimensional accuracy and surface quality of the machining.

[0071] 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 present 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.

[0072] Although embodiments of the present 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 present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A double-sided indexable cutting insert, characterized in that, include: The blade body (1) has two mutually opposing machining faces, each of which includes a mounting surface (11), and the blade body (1) has a blade mounting hole (12) that extends through the two mounting surfaces (11). Each of the machining faces has two main cutting edges (2) distributed along a first direction and two secondary cutting edges (3) distributed along a second direction at its edge. Each of the main cutting edges (2) has a first corner cutting edge (4) formed between it and one of the secondary cutting edges (3) and a second corner cutting edge (5) formed between it and another secondary cutting edge (3). A first main rake face (21) is formed between the main cutting edge (2) and the mounting surface (11). The first main rake face (21) is configured to extend downward in a direction close to the mounting surface (11). The angle between the first main rake face (21) and the mounting surface (11) is configured to decrease along the second direction from the first corner cutting edge (4) to the second corner cutting edge (5).

2. The double-sided indexable cutting insert according to claim 1, characterized in that, A second main rake face (22) is also formed between the first main rake face (21) and the mounting surface (11). The second main rake face (22) is constructed to extend downward in a direction close to the mounting surface (11). The included angle between the second main rake face (22) and the mounting surface (11) is constructed to decrease first and then increase along the second direction from the first corner cutting edge (4) to the second corner cutting edge (5).

3. The double-sided indexable cutting insert according to claim 1, characterized in that, The main cutting edge (2) is constructed such that it extends outward and then inward along the second direction from the first corner cutting edge (4) toward the second corner cutting edge (5), so that the middle part of the main cutting edge (2) protrudes outward relative to both ends; And / or, the height of the main cutting edge (2) protruding relative to the mounting surface (11) is configured to first decrease and then increase along the second direction from the first corner cutting edge (4) to the second corner cutting edge (5).

4. The double-sided indexable cutting insert according to claim 2, characterized in that, The secondary cutting edge (3) includes a first secondary cutting edge (31) and a second secondary cutting edge (32) connected sequentially along the first direction. Either the first secondary cutting edge (31) or the second secondary cutting edge (32) is constructed to bulge outwards and tilt in the direction closer to the other.

5. The double-sided indexable cutting insert according to claim 4, characterized in that, A first rake face (311) and a first chip-returning face (312) are sequentially provided between the first secondary cutting edge (31) and the mounting surface (11). Both the first secondary rake face (311) and the first secondary chip-returning face (312) are constructed to extend downwards at an angle close to the mounting surface (11). And / or, a second rake face (321) and a second chip-returning face (322) are sequentially provided between the second secondary cutting edge (32) and the mounting surface (11), and both the second secondary rake face (321) and the second secondary chip-returning face (322) are configured to extend downward at an angle close to the mounting surface (11).

6. The double-sided indexable cutting insert according to claim 5, characterized in that, The first secondary cutting edge (31) is connected to the first corner cutting edge (4), and the second secondary cutting edge (32) is connected to the second corner cutting edge (5). A first corner rake face (41) and a first corner chip return face (42) are sequentially provided between the first corner cutting edge (4) and the mounting surface (11). Both the first corner rake face (41) and the first corner chip return face (42) are constructed to extend downwards at an angle close to the mounting surface (11). Furthermore, a second corner rake face (51) and a second corner chip return face (52) are sequentially provided between the second corner cutting edge (5) and the mounting surface (11). Both the second corner rake face (51) and the second corner chip return face (52) are configured to extend downwards in a direction close to the mounting surface (11).

7. The double-sided indexable cutting insert according to claim 6, characterized in that, The second primary rake face (22), the second secondary chip-returning face (322), the second corner chip-returning face (52), and the mounting face (11) together define the chip-returning area (6). The chip-returning area (6) and the mounting face (11) are configured such that the height of the chip-returning area (6) and the mounting face (11) in the vertical direction gradually decreases in the second direction from the second corner cutting edge (5) to the first corner cutting edge (4).

8. The double-sided indexable cutting insert according to claim 1, characterized in that, The distance between the secondary cutting edge (3) and the mounting surface (11) is configured such that it first decreases and then increases along the first direction from the first corner cutting edge (4) to the second corner cutting edge (5).

9. The double-sided indexable cutting insert according to claim 1, characterized in that, The two first corner cutting edges (4) of each of the machining facets are arranged in a centrally symmetrical manner; And / or, the two second corner cutting edges (5) of each of the machining facets are arranged in a centrally symmetrical manner; And / or, the two machining blades are arranged in a centrally symmetrical manner.

10. A cutting tool, characterized in that, It includes a tool holder and a double-sided indexable cutting insert as described in any one of claims 1-9.

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