Cutting insert and rotary cutting tool

Abstract

The utility model discloses a cutting blade and a rotary cutting tool, the cutting blade is provided with an upper surface, a lower surface and a plurality of side surfaces, the side surfaces are adjacent to the upper surface and the lower surface, the intersection parts of the side surfaces and the upper surface are provided with a main cutting edge and an auxiliary cutting edge, and the intersection part of two adjacent side surfaces is provided with an angle edge. The intersection point of the auxiliary cutting edge and the angle edge is defined as G1, the cutting blade is provided with a central shaft, the intersection point of the projection of the central shaft on the side surface and the auxiliary cutting edge is defined as G2, and the vertex of the auxiliary cutting edge is defined as G0; wherein the horizontal distance from the G0 to the G1 is smaller than the horizontal distance from the G0 to the G2. The horizontal distance from G0 to G1 is set to be smaller than the horizontal distance from G0 to G2, so that the cutting residual allowance is greatly reduced, the load of the cutting edge is reduced, the strength of the cutting edge is improved, the quality of a machined surface subjected to surface milling cutting is greatly improved, and the service life of the cutter is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of cutting tools, in particular to a cutting blade and a rotary cutting tool. Background Art

[0002] In the related art, as a key component bearing the main cutting task in the machining process, the performance of the cutting blade directly affects the machining quality and efficiency. However, in the actual cutting process, the blade is often subjected to a large axial cutting force, especially in deep hole machining, rough machining or hard material machining, and the axial resistance is particularly significant.

[0003] Under the action of excessive axial cutting force, micro cracks are likely to occur at the blade edge or the edge is chipped, which will cause the blade to fail quickly, significantly reducing the service life of the blade. Summary of the Utility Model

[0004] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, the utility model provides a cutting blade, which improves the service life.

[0005] A cutting blade according to an embodiment of the utility model, the cutting blade has an upper surface, a lower surface and side surfaces, the number of the side surfaces is multiple, and the side surfaces are adjacent to the upper surface and the lower surface. The intersection part of the side surface and the upper surface is provided with a main cutting edge and a secondary cutting edge, the intersection part of two adjacent side surfaces is configured as a corner edge, the intersection point of the secondary cutting edge and the corner edge is defined as G1, the cutting blade has a central axis, the intersection point of the projection of the central axis on the side surface and the secondary cutting edge is defined as G2, and the vertex of the secondary cutting edge is defined as G0; wherein, the horizontal distance from G0 to G1 is less than the horizontal distance from G0 to G2.

[0006] For the cutting blade according to the embodiment of the utility model, by setting the horizontal distance from G0 to G1 to be less than the horizontal distance from G0 to G2, the cutting residual allowance is greatly reduced, which not only reduces the load on the cutting edge, but also improves the strength of the cutting edge, greatly improves the machined surface quality of face milling, and improves the tool life.

[0007] In some embodiments, the axial height from G0 to G1 is H1, the axial height from G0 to G2 is H2, and H1 < H2.

[0008] In some embodiments, 0.1mm ≤ H1 ≤ 0.3mm.

[0009] In some embodiments, along the secondary cutting edge, the distance from G1 to G2 is L, the horizontal distance from G0 to G1 is A1, and 0.2L ≤ A1 ≤ 0.5L.

[0010] In some embodiments, the upper surface is provided with a chip breaker groove, which is located at the edge of the upper surface and extends along the circumferential direction of the cutting blade.

[0011] In some embodiments, the upper surface portion is configured as a receiving plane, which is located within the surrounding ring of the chip breaker groove.

[0012] In some embodiments, the receiving surface is provided with a fixing hole for connecting the tool body to fix the cutting blade to the tool body.

[0013] In some embodiments, the cutting insert is constructed as a regular polygon, with an even number of sides, and multiple sides are arranged around the receiving plane. The cutting insert is constructed as an indexable insert, and the side of the indexable insert facing the workpiece is defined as the main side, and the intersection of the main side and the upper surface is the main cutting edge.

[0014] A rotary cutting tool according to an embodiment of the present invention includes a cutting blade and a tool body, wherein the cutting blade is the aforementioned cutting blade and the cutting blade is disposed on the tool body.

[0015] According to the embodiments of the present invention, the rotary cutting tool, by setting the horizontal distance from G0 to G1 to be smaller than the horizontal distance from G0 to G2, greatly reduces the residual cutting material, which not only reduces the load on the cutting edge but also improves the strength of the cutting edge, greatly improves the surface quality of face milling, and increases the tool life.

[0016] In some embodiments, the blade body is provided with a mounting groove, the mounting groove is provided with a mounting surface, and the lower surface is connected to the mounting surface.

[0017] 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

[0018] 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:

[0019] Figure 1 This is a schematic diagram of the cutting blade in an embodiment of the present invention;

[0020] Figure 2 for Figure 1 Side view of the cutting insert;

[0021] Figure 3 for Figure 1 Enlarged view of a section at point I;

[0022] Figure 4for Figure 1 Top view of the cutting insert.

[0023] Figure label:

[0024] 100. Cutting insert; 10. Upper surface; 11. Chip breaker groove; 12. Receiving plane; 13. Fixing hole; 20. Lower surface; 30. Side surface; 40. Main cutting edge; 41. Secondary cutting edge; 50. Cornering edge; X. Central shaft. Detailed Implementation

[0025] 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.

[0026] 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", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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.

[0027] Furthermore, features specified as "first" or "second" may explicitly or implicitly include one or more of the same feature, used to distinguish and describe features, without any order or distinction of importance.

[0028] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0029] 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.

[0030] The cutting blade 100 of this utility model embodiment is described below with reference to the accompanying drawings.

[0031] Reference Figures 1 to 4 According to an embodiment of the present invention, a cutting insert 100 is provided with an upper surface 10, a lower surface 20, and side surfaces 30. There are multiple side surfaces 30, and each side surface 30 is adjacent to the upper surface 10 and the lower surface 20. The intersection of the side surface 30 and the upper surface 10 is constructed with a main cutting edge 40 and a secondary cutting edge 41. The intersection of two adjacent side surfaces 30 is constructed with a corner cutting edge 50. The intersection point of the secondary cutting edge 41 and the corner cutting edge 50 is defined as G1. The cutting insert 100 has a central axis X. The intersection point of the projection of the central axis X on the side surface 30 and the secondary cutting edge 41 is defined as G2. The vertex of the secondary cutting edge 41 is defined as G0. The horizontal distance from G0 to G1 is less than the horizontal distance from G0 to G2.

[0032] Among them, the cutting insert 100 is usually used to process flat surfaces. It removes workpiece material by high-speed rotation to achieve the purpose of flat processing and is widely used in the machining industry.

[0033] The cutting insert 100 has a main cutting edge 40 and a secondary cutting edge 41. The main cutting edge 40 starts from a point on the cutting edge where the principal cutting edge angle is zero, and at least one section of the cutting edge can be used to cut a transition surface on the workpiece. The transition surface is the portion of the workpiece surface formed by the cutting edge, which is removed in the next cutting stroke, the next revolution of the tool or workpiece, or by the next cutting edge. The main cutting edge 40 directly participates in the cutting work and undertakes the main cutting task, used to remove excess material from the workpiece to form the transition surface. The principal cutting edge angle is a measurement term, which is the angle between the main cutting edge measured in the base plane and the assumed feed direction. More specifically, it is the prior art, which will not be elaborated here.

[0034] The secondary cutting edge 41 is the cutting edge other than the main cutting edge 40. The secondary cutting edge 41 starts from the point where the principal cutting edge angle is zero. The secondary cutting edge 41 extends in the direction away from the main cutting edge 40. The secondary cutting edge 41 assists in cutting and works with the main cutting edge 40 to complete the removal of excess material, thereby reducing the burden on the main cutting edge 40.

[0035] The angular cutting edge 50 is the tip of the tool, which is arc-shaped. The angular cutting edge 50 is the intersection of the main cutting edge 40 and the secondary cutting edge 41.

[0036] Among them, on the side 30 where the secondary cutting edge 41 is located, the projection of the central axis X is a straight line, the intersection of the straight line and the secondary cutting edge 41 is G2, the intersection of the secondary cutting edge 41 and the corner edge 50 is the endpoint of the secondary cutting edge 41, when the cutting insert 100 is laid flat on the plane, the lower surface 20 faces down and the upper surface 10 faces up, and the vertex of the secondary cutting edge 41 is the highest point.

[0037] In related technologies, cutting inserts are key components that bear the main cutting tasks in machining processes, and their performance directly affects machining quality and efficiency. However, in actual cutting processes, inserts are often subjected to large axial cutting forces, especially when performing deep hole machining, roughing, or machining of hard materials, where axial resistance is particularly significant.

[0038] Excessive axial cutting force can easily cause micro-cracks or chipping on the cutting edge of the insert, leading to rapid insert failure. This not only significantly reduces insert lifespan but also affects the quality and dimensional accuracy of the machined surface, increasing tool change frequency and downtime. Furthermore, frequent tool changes increase overall manufacturing costs and the burden of manual maintenance, severely hindering improvements in machining efficiency and production cycle time.

[0039] Therefore, how to effectively reduce axial resistance during the cutting process, reduce the risk of cutting tool chipping, and extend tool life has become a key technical problem that urgently needs to be solved in the field of cutting tool design and manufacturing.

[0040] This embodiment of the invention sets the horizontal distance from G0 to G1 to be smaller than the horizontal distance from G0 to G2, so that when the cutting insert 100 on the rotary cutting tool feeds, the rotational profiles of the secondary cutting edges 41 between different teeth are cross-over overlapping, which is better than the parallel feed cutting scheme of the secondary cutting edges in related technologies. Furthermore, compared with the circular arc cutting edge scheme composed of multiple lines in related technologies, the cutting insert 100 of this embodiment reduces the contact area between the secondary cutting edge 41 and the workpiece, greatly reducing the residual cutting material. Simultaneously, this embodiment reduces the load on the cutting edge and improves its strength. Multiple cutting verifications show that under the same cutting conditions, within a feed range of 0.1mm to 0.5mm, compared with cutting inserts in related technologies, the height of the clearance between the secondary cutting edge 41 and the machining surface is reduced by 7 to 33 times, and the cutting edge life is increased by 1.5 to 2 times, greatly improving the surface quality of face milling and increasing tool life.

[0041] Specifically, when the cutting insert 100 is placed horizontally, G0, G1, and G2 can be located at different heights. The horizontal distance from G0 to G1 refers to the distance between the two projections of G0 and G1 when they are projected onto the same horizontal plane. The horizontal distance from G0 to G2 refers to the distance between the two projections of G0 and G2 when they are projected onto the same horizontal plane.

[0042] According to the cutting blade 100 of the embodiment of the present utility model, by setting the horizontal distance from G0 to G1 to be less than the horizontal distance from G0 to G2, the cutting residual allowance is greatly reduced, which not only reduces the load on the cutting edge but also improves the strength of the cutting edge, greatly improves the machined surface quality of face milling, and increases the tool life.

[0043] Referring to Figure 3 , in some embodiments, the axial height from G0 to G1 is H1, and the axial height from G0 to G2 is H2, where H1 < H2.

[0044] Among them, when the cutting blade 100 is placed horizontally, G0, G1, and G2 can be at different heights. The axial height from G0 to G1 is the distance of the projections of G0 and G1 on the central axis X, and the axial height from G0 to G2 is the distance of the projections of G0 and G2 on the central axis X. By setting H1 < H2, G0, G1, and G2 are within a certain height range.

[0045] In the above solution, by setting H1 < H2 to control the axial heights of G0, G1, and G2, the rotational profiles of the secondary cutting edges 41 between different teeth are cross - superimposed cuttings, providing a better cutting solution, reducing the contact area between the secondary cutting edge 41 and the workpiece, reducing the cutting residual allowance, reducing the overall load on the cutting edge, improving the strength, reducing the height of the clearance allowance between the secondary cutting edge 41 and the machined flat part, and increasing the life.

[0046] Referring to Figure 3 , in some embodiments, 0.1 mm ≤ H1 ≤ 0.3 mm.

[0047] Among them, the axial height from G0 to G1 is H1. G0 and G1 respectively have projections on the central axis X, and the distance between the projections of G0 and G1 on the central axis X is the axial height between G0 and G1. H1 is within the range of from 0.1 mm to 0.3 mm to control the axial height between G0 and G1.

[0048] In the above solution, by setting the axial height H1 from G0 to G1 within the range of from 0.1 mm to 0.3 mm, the contact area between the secondary cutting edge 41 and the workpiece is reduced, the cutting residual allowance is greatly reduced, the load on the cutting edge is reduced, the overall strength of the cutting edge is increased, and the overall performance of the cutting blade 100 is improved.

[0049] Specifically, the axial height H1 from G0 to G1 is in the range of 0.1mm to 0.3mm, and H1 can be any value among 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, and 0.3mm.

[0050] Reference Figure 3 In some embodiments, along the secondary cutting edge 41, the distance from G1 to G2 is L, the horizontal distance from G0 to G1 is A1, and 0.2L≤A1≤0.5L.

[0051] The vertex of the secondary cutting edge 41 is defined as G0, the intersection of the secondary cutting edge 41 and the corner cutting edge 50 is defined as G1, and the intersection of the projection of the central axis X on the side surface 30 and the secondary cutting edge 41 is defined as G2. G0, G1, and G2 are all on the secondary cutting edge 41. The distance between G1 and G2 along the secondary cutting edge 41 is L. On the horizontal plane, G0 and G1 each have their own projections. On the horizontal plane, the distance between the projections of G0 and G1 is A1, which is in the range of 0.2L to 0.5L.

[0052] In the above scheme, by setting A1 in the range of 0.2L to 0.5L, the horizontal distance between G0 and G1 is controlled within the set range, thereby making the horizontal distance between G0 and G1 correlate with the distance between G1 and G2, resulting in better overall fit, improving the overall strength of the secondary cutting edge 41, improving the overall strength of the cutting insert 100, and improving the overall performance.

[0053] Specifically, the horizontal distance A1 from G0 to G1 is in the range of 0.2L to 0.5L, and A1 can be any value among 0.2L, 0.3L, 0.4L, and 0.5L.

[0054] Specifically, the height of G0 to the bearing plane 12 on the lower surface 20 is greater than the height of any other point on the secondary cutting edge 41 or the main cutting edge 40 to the bearing plane 12 on the lower surface 20.

[0055] Reference Figure 1 In some embodiments, the upper surface 10 is provided with a chip breaker groove 11, which is located at the edge of the upper surface 10 and extends along the circumferential direction of the cutting blade 100.

[0056] Among them, a chip breaking groove 11 is provided on the upper surface 10. The chip breaking groove 11 is a special groove structure. The chip breaking groove 11 is located at the edge of the upper surface 10 and extends along the circumferential direction of the cutting blade 100. The chip breaking groove 11 plays a chip breaking role. By applying forced deformation to the chip, the chip breaking groove 11 achieves effective chip breaking and flow direction control.

[0057] In the above scheme, the upper surface 10 is provided with a chip breaker groove 11. The chip breaker groove 11 is located at the edge of the upper surface 10 and extends along the circumferential direction of the cutting blade 100. The chip breaker groove 11 fully utilizes the chip breaking function, and the chip is forced to curl and deform by chip breaking, so as to avoid the formation of long strip-shaped chips that wrap around the tool or workpiece. At the same time, the chip breaker groove 11 guides the flow of chips, prevents scratching the machined surface or embedding into the machine tool guide rail, reduces the contact area, and lowers the cutting temperature.

[0058] Specifically, the chip breaker groove 11 can be a straight line, which has a simple structure; the chip breaker groove 11 can also be a straight-arc type, which combines straight line and arc design, and the chip breaking and tool tip strength are more balanced; the chip breaker groove 11 can also be a full arc type, where the bottom of the full arc type chip breaker groove 11 is a continuous arc, which reduces cutting force and improves chip breaking effect.

[0059] Reference Figure 1 In some embodiments, the upper surface 10 is partially configured as a receiving plane 12, which is located within the surrounding ring of the chip breaking groove 11.

[0060] The upper surface 10 is constructed as a receiving plane 12, which provides mechanical support. The receiving plane 12 is located within the encirclement of the chip breaker groove 11 and is closer to the central axis X than the chip breaker groove 11.

[0061] In the above scheme, the upper surface 10 is partially constructed as a receiving plane 12. The receiving plane 12 is located within the encirclement of the chip breaker groove 11. By utilizing the mechanical support function of the receiving plane 12, it plays a supporting role, transmits cutting force, avoids chipping or breakage caused by local stress concentration, and achieves effective chip breaking through forced chip breaking.

[0062] In some embodiments, the receiving plane 12 is provided with a fixing hole 13, which is used to connect the tool body to fix the cutting blade 100 to the tool body.

[0063] The receiving surface 12 is provided with a fixing hole 13, which provides a fixing structure for the cutting blade 100. For example, a bolt is provided in the fixing hole 13, and the blade body is connected by the bolt, thereby fixing the cutting blade 100 to the blade body.

[0064] In the above solution, by setting a fixing hole 13 on the receiving plane 12, the cutting blade 100 is fixed on the blade body by connecting the fixing hole 13, which facilitates installation and replacement and improves convenience.

[0065] Reference Figures 1 to 4 In some embodiments, the cutting insert 100 is constructed as a regular polygon with an even number of side surfaces 30. The multiple side surfaces 30 are arranged around the receiving plane 12. The cutting insert 100 is constructed as an indexable insert. The side surface 30 facing the workpiece on the indexable insert is defined as the main side surface 30. The intersection of the main side surface 30 and the upper surface 10 is the main cutting edge 40.

[0066] The cutting insert 100 is constructed as a regular polygon with an even number of sides 30. For example, the cutting insert 100 is a regular octagon with eight sides 30. Multiple sides 30 are arranged around the receiving plane 12. The cutting insert 100 is constructed as an indexable insert. The side 30 facing the workpiece on the indexable insert is defined as the main side 30. The intersection of the main side 30 and the upper surface 10 is the main cutting edge 40. The indexable insert can be indexed. After indexing, the side 30 facing the workpiece of the indexable insert changes, the main side 30 changes, and the cutting insert 100 switches the main cutting edge 40.

[0067] In the above solution, by setting the cutting insert 100 as a regular polygon and making it an indexable insert, after one of the main cutting edges 40 wears out, it is only necessary to loosen the clamping mechanism and index the cutting insert 100 to continue using the other intact main cutting edges 40, thereby reducing costs.

[0068] In some embodiments, the receiving plane 12 is higher than the main cutting edge 40 and the secondary cutting edge 41.

[0069] The rotary cutting tool according to an embodiment of the present invention includes a cutting blade 100 and a tool body. The cutting blade 100 is the aforementioned cutting blade 100, and the cutting blade 100 is disposed on the tool body.

[0070] According to the embodiments of the present invention, the rotary cutting tool, by setting the horizontal distance from G0 to G1 to be smaller than the horizontal distance from G0 to G2, greatly reduces the residual cutting material, which not only reduces the load on the cutting edge but also improves the strength of the cutting edge, greatly improves the surface quality of face milling, and increases the tool life.

[0071] In some embodiments, the blade body is provided with a mounting groove, the mounting groove is provided with a mounting surface, and the lower surface 20 is connected to the mounting surface.

[0072] The cutter body is provided with a mounting groove, and a mounting surface is provided in the mounting groove. The lower surface 20 of the cutting blade 100 is connected to the mounting surface to stabilize the cutting blade 100.

[0073] Specifically, the cutting insert 100 is disposed in the tool body, and the main cutting edge 40 and the secondary cutting edge 41 rotate around the central axis of the tool body for cutting. The projection of the rotational profile of the secondary cutting edge 41 onto the base plane perpendicular to the cutting end face is an arc curve and bends downward.

[0074] Specifically, the rotary cutting tool in this embodiment of the present invention is a finishing rotary cutting tool, and the cutting insert 100 is a positive octagonal negative double-sided insert.

[0075] The cutting insert 100 is symmetrically arranged around axis X, and has an upper surface 10, a lower surface 20, and a side surface 30 connecting the upper surface 10 and the lower surface 20. The upper surface 10 has a chip removal groove and a receiving surface 12. The receiving surface 12 is higher than the main cutting edge 40 and the secondary cutting edge 41, which can protect the cutting edge and prevent it from scratching the tool body. The side surface 30 of the cutting insert 100 is formed by connecting eight rear inserts to form a regular octagonal structure. The cutting edge is formed at the intersection of the upper surface 10 and the side surface 30, so that the upper surface 10 and the lower surface 20 each have eight sets of cutting edges. Each set of cutting edges consists of a main cutting edge, a secondary cutting edge, and a rounded edge 50. The chip removal groove is a U-shaped groove structure, with one side connected to the cutting edge and the other side connected to the receiving surface 12. The U-shaped groove structure facilitates the smooth discharge of chips and prevents chip accumulation that could scratch the workpiece. The projection angle between the main cutting edge 40 and the secondary cutting edge 41 in the top view of the insert is 45 degrees. A fillet edge 50 connects the main cutting edge 40 and the secondary cutting edge 41. In the side view of the cutting insert 100, the main cutting edge 40 curves downwards, and the secondary cutting edge 41 is an arc curve that convexes upwards, tangentially connecting to each other to form a wavy arc cutting edge. The crest of the wavy cutting edge is located on the secondary cutting edge 41, and the trough is located on the main cutting edge 40. The intersection point of the secondary cutting edge 41 and the fillet edge 50 is G1. The secondary cutting edge 41 intersects the projection line of the axis X at point G2, and the highest point of the arc of the secondary cutting edge 41 is G0. G0 is located to the right of the axis X. (In actual cutting tool inspection, the centerline X of the cutting tool 100 can be found using a profilometer or tool setting instrument. The intersection of the centerline X and the secondary cutting edge 41 determines point G2. Similarly, the tangent point G0 and endpoint G1 can also be determined using the aforementioned instruments.) In the side view of the cutting tool 100, the horizontal distance from G0 to G1 is less than the horizontal distance from G0 to G2, and the axial height H1 from G0 to G1 is less than the axial height H2 from G0 to G2. Along the secondary cutting edge 41, the distance from G1 to G2 is L. The cutting edge geometry satisfies: 0.2L ≤ A1 < 0.5L, and 0.1mm ≤ H1 ≤ 0.3mm.

[0076] The outer circumference of the tool body is provided with a mounting groove, and the mounting groove has a mounting surface. The lower surface 20 of the cutting insert 100 contacts the mounting surface, and the cutting edge rotates around the central axis of the tool body. The resulting cutting effect is:

[0077] The projection of the secondary cutting edge 41's rotating profile onto a base plane perpendicular to the cutting end face is a circular arc curve that curves downwards. On the projected circular arc curve of the secondary cutting edge 41 on the base plane, the horizontal distance from the tangent point G0 to the endpoint G1 is less than the horizontal distance from the tangent point G0 to G2, and the axial height H1 from the tangent point G0 to the endpoint G1 is less than the axial height H2 from the tangent point G0 to the endpoint G2. Furthermore, G0 is the lowest point of the circular arc curve, and G0 preferentially contacts the workpiece. Compared with related technologies, the advantages of this implementation scheme are: during tool feed cutting, the rotating profiles of the secondary cutting edges 41 between different teeth are cross-over superimposed, reducing the contact area between the secondary cutting edge 41 and the workpiece, and greatly reducing the residual cutting material. At the same time, it reduces the load on the cutting edge while ensuring the strength of the cutting edge. Through multiple cutting verifications, it was found that under the same cutting conditions and within a feed range of 0.1mm to 0.5mm, the height of the clearance allowance between the secondary cutting edge 41 and the machining plane of the cutting insert 100 presented in this embodiment of the present invention is reduced by 7 to 33 times compared with the cutting inserts of related technologies, and the life of the cutting edge is increased by 1.5 to 2 times, which greatly improves the surface quality of face milling and increases tool life.

[0078] Other configurations and operations of the cutting blade 100 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0079] In this specification, the terms "embodiment," "example," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are 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.

[0080] 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 cutting blade, characterized in that, The cutting insert has an upper surface, a lower surface, and multiple side surfaces, each adjacent to the upper and lower surfaces. The intersection of a side surface and the upper surface forms a primary cutting edge and a secondary cutting edge. The intersection of two adjacent side surfaces forms a corner cutting edge. The intersection point of the secondary cutting edge and the corner cutting edge is defined as G1. The cutting insert has a central axis. The intersection point of the projection of the central axis onto the side surface and the secondary cutting edge is defined as G2. The vertex of the secondary cutting edge is defined as G0. The horizontal distance from G0 to G1 is less than the horizontal distance from G0 to G2.

2. The cutting blade according to claim 1, characterized in that, The axial height from G0 to G1 is H1, and the axial height from G0 to G2 is H2. <H2。 3. The cutting blade according to claim 2, characterized in that, 0.1mm≤H1≤0.3mm.

4. The cutting blade according to claim 1, characterized in that, Along the secondary cutting edge, the distance from G1 to G2 is L, and the horizontal distance from G0 to G1 is A1, where 0.2L≤A1≤0.5L.

5. The cutting insert according to any one of claims 1 to 4, characterized in that, The upper surface is provided with a chip breaker groove, which is located at the edge of the upper surface and extends along the circumferential direction of the cutting blade.

6. The cutting blade according to claim 5, characterized in that, The upper surface portion is constructed as a receiving plane, which is located within the surrounding ring of the chip breaking groove.

7. The cutting blade according to claim 6, characterized in that, The receiving surface is provided with a fixing hole, which is used to connect the tool body to fix the cutting blade to the tool body.

8. The cutting blade according to claim 6, characterized in that, The cutting insert is constructed as a regular polygon, with an even number of sides. Multiple sides are arranged around the receiving plane. The cutting insert is constructed as an indexable insert. The side of the indexable insert facing the workpiece is defined as the main side. The intersection of the main side and the upper surface is the main cutting edge.

9. A rotary cutting tool, characterized in that, It includes a cutting blade and a tool body, wherein the cutting blade is the cutting blade according to any one of claims 1 to 8, and the cutting blade is disposed on the tool body.

10. The rotary cutting tool according to claim 9, characterized in that, The blade body is provided with a mounting groove, the mounting groove is provided with a mounting surface, and the lower surface is connected to the mounting surface.

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