High-wear-resistance powder metallurgy high-speed cutting tool

Abstract

The invention relates to the field of machining tools, in particular to a high-wear-resistance powder metallurgy high-speed cutting tool which comprises a tool body formed by integrally sintering powder metallurgy materials, a main cutting edge, an auxiliary cutting edge and a tool nose arc transition section are arranged at the front end of the tool body, and the main cutting edge is in a micro-concave arc shape; a latticed reinforcing rib structure formed by longitudinal reinforcing ribs and transverse connecting ribs is arranged on the back surface of the front part of the cutter body; a heat dissipation channel system composed of a main heat dissipation hole channel, branch heat conduction grooves and surface heat dissipation fins is arranged in the cutter body. The problems of cutting edge stress concentration and unsmooth heat dissipation in high-speed cutting can be solved.

Description

Technical Field

[0001] This invention relates to the field of machining tools, and in particular to a high-wear-resistant powder metallurgy high-speed cutting tool. Background Technology

[0002] In the fields of modern precision machinery manufacturing and high-end equipment processing, high-speed cutting technology, with its superior processing efficiency, excellent surface integrity, and effective control over the thermal deformation of parts, has become a core technological means to achieve the coordinated development of high output and high precision. As the terminal actuator in the cutting system that directly acts on the workpiece, performs material shear deformation, and ultimately shapes the geometric contour of precision parts, the comprehensive performance of cutting tools is not only an important technical benchmark for measuring a country's manufacturing capabilities but also a key factor determining the economic benefits and production quality of the entire processing process. With the increasing application of difficult-to-machine materials (such as high-strength alloys and precision mold steels) in the aerospace, automotive, and mold industries, almost stringent requirements have been placed on the hardness, red hardness, toughness, and chemical stability of cutting tools.

[0003] Powder metallurgy, due to its ability to produce tool materials with high hardness, high wear resistance, and uniform composition, has been widely used in the manufacture of high-performance cutting tools. Existing high-speed cutting tools mostly employ solid carbide or coated structures. However, during continuous high-speed cutting, especially when machining high-hardness or highly abrasive materials, the tool edge is prone to wear, chipping, or plastic deformation, leading to decreased machining accuracy and shortened tool life. Although optimizing material composition or surface treatment can improve wear resistance to some extent, the mechanical structure of existing tools still has limitations in stress distribution and heat dissipation path design, making it difficult to balance edge strength and thermal stability under high-load conditions, thus affecting their reliability and consistency during long-term high-speed cutting. Summary of the Invention

[0004] This invention provides a high wear-resistant powder metallurgy high-speed cutting tool, which aims to solve the problems of wear, chipping, and plastic deformation caused by stress concentration on the cutting edge and poor heat dissipation path in the machining of high hardness or highly abrasive materials by existing high-speed cutting tools, thereby improving the structural strength, thermal stability and service life of the tool under high load conditions.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] Design a high-wear-resistant powder metallurgy high-speed cutting tool, comprising a tool body, a cutting edge, a reinforcing rib structure, and a heat dissipation channel system, wherein: The blade body is integrally pressed and sintered from powder metallurgy material. Its front end forms the main cutting area, and its rear end has a mounting shank for clamping and fixing. The cutting edge is located at the front end of the blade body and includes a main cutting edge, a secondary cutting edge, and a rounded transition section at the tip where the two meet. The main cutting edge extends along the leading edge of the blade body, and its cutting edge line is slightly concave to disperse the concentrated stress acting on the cutting edge during the cutting process. The secondary cutting edge extends from the tip to the rear side of the blade body, and its cutting edge and the main cutting edge form an acute angle. This angle is controlled between 75 and 85 degrees to balance cutting sharpness and edge support strength.

[0007] The reinforcing rib structure is located on the back of the front part of the blade body, specifically including several longitudinal reinforcing ribs and transverse connecting ribs. The longitudinal reinforcing ribs extend parallel to the main cutting edge from behind the blade tip to the middle of the blade body. The cross-section of each longitudinal reinforcing rib is trapezoidal, with its upper surface flush with the back of the blade body and its lower bottom surface embedded inside the blade body to a depth of one-third to one-half of the blade body thickness. The transverse connecting ribs are vertically connected to adjacent longitudinal reinforcing ribs to form a grid-like support skeleton. This skeleton is located in the high-stress area directly behind the cutting edge to enhance the bending stiffness and impact resistance of the cutting edge area.

[0008] The heat dissipation channel system is installed throughout the blade body and includes a main heat dissipation channel, branch heat conduction grooves, and surface heat dissipation fins. The main heat dissipation channel is opened along the length of the blade body on the central axis of the blade body, with one end opening at the end of the mounting shank and the other end terminating behind the front reinforcing rib structure of the blade body. The branch heat conduction grooves extend obliquely on both sides of the main heat dissipation channel and lead to the root area of ​​each longitudinal reinforcing rib. The cross-section of each branch heat conduction groove is elliptical, and its major axis is consistent with the heat flow transfer path. The surface heat dissipation fins are arranged on both sides of the blade body and are radially distributed from the front of the blade body to the rear. The thickness of each heat dissipation fin gradually decreases from the root to the end, and an air convection gap is formed between adjacent fins, with a gap width of not less than 0.5 mm.

[0009] Optionally, the radius of curvature of the blade tip arc transition section is set between 0.2 mm and 0.4 mm. The surface of the arc section is subjected to ultra-precision grinding, and the surface roughness Ra value is no greater than 0.1 micrometer, so as to reduce the local stress peak during the initial cutting and suppress the initiation of microcracks.

[0010] Optionally, the rake angle of the main cutting edge is -5 degrees to 0 degrees, the clearance angle is 6 degrees to 10 degrees, and the width of the cutting edge is controlled between 0.1 mm and 0.2 mm. The cutting edge area is subjected to laser cladding strengthening treatment to form a tungsten carbide dispersion strengthening layer with a thickness of 10 to 20 micrometers. This strengthening layer is metallurgically bonded to the base material, eliminating the risk of interface peeling.

[0011] Optionally, the cross-section of the mounting shank is a polygonal structure, specifically a hexagon, and its outer contour dimensions conform to the ISO standard tool holder interface specification. A positioning tapered hole is provided at the center of the end of the shank. This tapered hole is coaxially connected to the main heat dissipation channel and is used to connect with the machine tool spindle cooling air passage during clamping to achieve internal forced air cooling.

[0012] Optionally, there are three longitudinal reinforcing ribs, with the central one being the main reinforcing rib, which is 20% higher than the auxiliary reinforcing ribs on both sides. The main reinforcing rib is directly opposite the blade tip and bears the main component of the cutting reaction force. There are four transverse connecting ribs, which are evenly distributed along the entire length of the longitudinal reinforcing ribs. The foremost transverse connecting rib is located 1.5 mm behind the blade tip to constrain the elastic deformation of the blade tip area in the first instance.

[0013] Optionally, the number of branch heat conduction grooves corresponds to the number of longitudinal reinforcing ribs. Each branch heat conduction groove is provided with a heat conduction transition cavity between the root of the corresponding longitudinal reinforcing rib. The transition cavity is funnel-shaped with a wide inlet and a narrow outlet, which guides heat from the high heat flux density area into the main heat dissipation channel efficiently.

[0014] Optionally, the total number of surface heat dissipation fins is twelve, symmetrically distributed on the left and right, with six fins on each side. The root of the fins and the side of the blade body are transitioned by a rounded chamfer with a chamfer radius of 0.3 mm to avoid stress concentration. The edge of the fin end is blunted to eliminate sharp edges and prevent aerodynamic noise and eddy current disturbance during high-speed rotation.

[0015] Optionally, the back of the front part of the blade body is also provided with a stress relief groove. The groove is located on the outside of the area where the reinforcing rib structure connects with the blade body, and is in the form of a closed ring. The groove depth is one-tenth of the blade body thickness and the groove width is 0.8 mm. It is used to block the path of cracks spreading along the surface of the blade body.

[0016] Optionally, the inner wall of the main heat dissipation channel is provided with spiral guide patterns with a pitch of five millimeters and a spiral direction opposite to the normal rotation direction of the tool, so as to enhance the turbulence effect of the internal cooling gas when the tool rotates and improve the convective heat transfer efficiency.

[0017] The high-wear-resistant powder metallurgy high-speed cutting tool provided by this invention has the following beneficial effects: This high-wear-resistant powder metallurgy high-speed cutting tool effectively disperses concentrated loads acting on the cutting edge during cutting and reduces local stress peaks by designing the main cutting edge as a micro-concave arc shape and coordinating with a precisely controlled tip arc transition section. The reinforcing rib structure, embedded in a grid-like layout on the front back of the tool body, significantly improves the bending and impact resistance of the cutting edge area, suppressing chipping and plastic deformation. The heat dissipation channel system, composed of main heat dissipation channels, branch heat conduction grooves, and surface heat dissipation fins, forms an efficient three-dimensional heat dissipation path from the high-heat zone of the cutting edge to the end of the tool holder, accelerating the removal of cutting heat. Simultaneously, the tungsten carbide dispersion reinforcement layer in the cutting edge area significantly improves surface wear resistance without sacrificing toughness. These structural features work together to maintain stable geometric accuracy and cutting performance when machining difficult-to-machine materials such as high-strength alloys or precision mold steels, extending tool life and ensuring reliability and consistency during long-term high-speed cutting. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a three-dimensional structural diagram of the reinforcing rib structure on the back of the front part of the blade body of the present invention; Figure 3 This is a schematic diagram of the longitudinal cross-sectional structure of the present invention; In the figure, 1. Tool body; 2. Cutting edge; 3. Main cutting edge; 4. Secondary cutting edge; 5. Rounded transition section at the tip; 6. Mounting shank; 7. Longitudinal reinforcing rib; 8. Transverse connecting rib; 9. Main reinforcing rib; 10. Auxiliary reinforcing rib; 11. Mesh-like support frame; 12. Main heat dissipation channel; 13. Branch heat conduction groove; 14. Surface heat dissipation fins; 15. Heat conduction transition cavity; 16. Stress relief groove; 17. Spiral guide pattern; 18. Positioning cone hole; 19. Cutting edge area; 20. Tungsten carbide dispersion reinforcement layer; 21. Air convection gap; 22. Back of tool body; 23. Side of tool body; 24. Root of reinforcing rib; 25. Main cutting area; 26. Heat dissipation channel system; 27. Reinforcing rib structure; 28. Rounded chamfer; 29. ​​Passivated end; 30. Polygonal cross-section. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] Please see Figures 1 to 3 This invention provides a high-wear-resistant powder metallurgy high-speed cutting tool. The tool is integrally formed from powder metallurgy material through pressing and sintering processes, and is suitable for high-speed cutting of high-hardness or highly abrasive materials such as high-strength alloys and precision mold steel. The tool includes a tool body 1, a cutting edge 2, a reinforcing rib structure 27, and a heat dissipation channel system 26.

[0026] like Figure 1As shown, the front end of the tool body 1 forms the main cutting area 25, and the rear end is provided with a mounting shank 6. The cross-section of the mounting shank 6 is a polygonal cross-section 30, specifically a hexagonal structure. Its outer contour dimensions conform to the ISO standard tool holder interface specification, facilitating its use with general machine tool clamping devices. The center of the end of the mounting shank 6 is provided with a positioning tapered hole 18, which is coaxially connected to the main heat dissipation channel 12, and is used to connect with the machine tool spindle cooling air passage during clamping to achieve internal forced air cooling function.

[0027] The cutting edge 2 is located at the front end of the tool body 1, including a main cutting edge 3, a secondary cutting edge 4, and a rounded transition section 5 at the intersection of the two. The main cutting edge 3 extends along the leading edge of the tool body 1, and its cutting edge line is slightly concave. This geometry can effectively disperse the concentrated stress acting on the cutting edge during the cutting process, avoiding excessively high local stress peaks that could cause chipping or microcracks. The secondary cutting edge 4 extends from the tip towards the rear of the tool body 1, and its cutting surface forms an acute angle with the cutting surface of the main cutting edge 3. This angle is controlled between 75 and 85 degrees, balancing cutting sharpness and edge support strength.

[0028] The radius of curvature of the cutter tip arc transition section 5 is set between 0.2 mm and 0.4 mm, and its surface undergoes ultra-precision grinding, with a surface roughness Ra value of no more than 0.1 micrometer. This fine surface treatment process can reduce frictional resistance in the initial cutting stage and suppress the initiation and propagation of microcracks in the cutter tip region.

[0029] The main cutting edge 3 has a rake angle of -5 to 0 degrees and a clearance angle of 6 to 10 degrees, with the cutting edge width controlled between 0.1 mm and 0.2 mm. The cutting edge area 19 undergoes laser cladding strengthening treatment, forming a tungsten carbide dispersion strengthening layer 20 with a thickness of 10 to 20 micrometers on its surface. This tungsten carbide dispersion strengthening layer 20 is firmly bonded to the base material of the tool body 1 through metallurgical bonding, eliminating the risk of interface delamination and significantly improving the surface hardness and wear resistance of the cutting edge area.

[0030] like Figure 2 As shown, the reinforcing rib structure 27 is provided on the back side 22 of the tool body, specifically including several longitudinal reinforcing ribs 7 and transverse connecting ribs 8. The longitudinal reinforcing ribs 7 extend parallel to the main cutting edge 3 from behind the tool tip to the middle of the tool body 1. There are three longitudinal reinforcing ribs 7, with the central one being the main reinforcing rib 9, whose height is 20% higher than the auxiliary reinforcing ribs 10 on both sides. The main reinforcing rib 9 faces the tool tip and directly bears the main component of the cutting reaction force. The cross-section of each longitudinal reinforcing rib 7 is trapezoidal, with its upper surface flush with the back side 22 of the tool body and its lower bottom surface embedded inside the tool body 1, with an embedding depth of one-third to one-half of the thickness of the tool body 1.

[0031] Four transverse connecting ribs 8 are vertically connected to adjacent longitudinal reinforcing ribs 7, evenly distributed along the entire length of the longitudinal reinforcing ribs 7. The foremost transverse connecting rib 8 is positioned 1.5 mm behind the cutting tip to immediately constrain elastic deformation in the cutting tip area. The longitudinal reinforcing ribs 7 and the transverse connecting ribs 8 together form a grid-like support frame 11. This frame is located in the high-stress area directly behind the cutting edge 2, enhancing the bending stiffness and impact resistance of the cutting edge area.

[0032] The back surface 22 of the blade body is also provided with a stress relief groove 16. This groove is located on the outside of the area where the reinforcing rib structure 27 connects to the main body of the blade body 1, and is in a closed annular shape. The groove depth of the stress relief groove 16 is one-tenth of the thickness of the blade body 1, and the groove width is 0.8 mm. It is used to block the path of crack propagation along the surface of the blade body 1 and prevent cracks from spreading from the root 24 of the reinforcing rib to the main body of the blade body 1.

[0033] like Figure 3 As shown, the heat dissipation channel system 26 is installed throughout the interior of the cutter body 1, including a main heat dissipation channel 12, branch heat conduction grooves 13, and surface heat dissipation fins 14. The main heat dissipation channel 12 is located along the length of the cutter body 1 on its central axis, with one end opening at the end of the mounting shank 6 and the other end terminating behind the front reinforcing rib structure 27 of the cutter body 1. The inner wall of the main heat dissipation channel 12 is provided with spiral guide lines 17 with a pitch of five millimeters and a spiral direction opposite to the normal rotation direction of the cutter. When the cutter rotates at high speed, the cooling gas generates turbulence in the main heat dissipation channel 12 due to the action of the spiral guide lines 17, enhancing the convective heat transfer efficiency.

[0034] The branch heat conduction grooves 13 extend obliquely to the sides of the self-heating channels 12, leading to the root region of each longitudinal reinforcing rib 7. The number of branch heat conduction grooves 13 corresponds to the number of longitudinal reinforcing ribs 7. The cross-section of each branch heat conduction groove 13 is elliptical, and its major axis is aligned with the heat flow path. A heat conduction transition cavity 15 is provided between each branch heat conduction groove 13 and the root 24 of the corresponding longitudinal reinforcing rib. This heat conduction transition cavity 15 is funnel-shaped, with a wide inlet and a narrow outlet, guiding heat from the high heat flux density region into the main heat dissipation channel 12 efficiently.

[0035] Surface heat dissipation fins 14 are disposed on the side 23 of the blade body, radially distributed from the front to the rear of the blade body 1. There are a total of twelve surface heat dissipation fins 14, symmetrically distributed on both sides, with six fins on each side. The thickness of each heat dissipation fin gradually decreases from the root to the tip, forming an air convection gap 21 between adjacent fins, with a gap width of not less than 0.5 mm. The root of the heat dissipation fin transitions to the side 23 of the blade body through a rounded chamfer 28 with a chamfer radius of 0.3 mm to avoid stress concentration. The edge of the heat dissipation fin is passivated to form a passivated end 29, eliminating sharp edges and preventing aerodynamic noise and eddy current disturbances during high-speed rotation.

[0036] The blade body 1 is integrally pressed and sintered from powder metallurgy material. The material composition can be adjusted according to the specific processing object, and it usually contains a high proportion of tungsten carbide, cobalt, nickel and trace rare earth elements to balance high hardness, high toughness and good thermal stability. During the sintering process, the density is controlled to be no less than 99.5% to ensure that the internal structure is uniform and free of pore defects.

[0037] During actual cutting, cutting heat is first generated in the area of ​​the main cutting edge 3 and the secondary cutting edge 4. The heat is conducted through the front part of the tool body 1 to the grid-like support frame 11 formed by the longitudinal reinforcing ribs 7 and the transverse connecting ribs 8. Since the reinforcing rib structure 27 is embedded inside the tool body 1 and integrally formed with the tool body 1, the heat conduction path is short and the contact area is large, and the heat quickly accumulates at the root 24 of the reinforcing rib. Subsequently, the heat enters the branch heat conduction groove 13 through the heat conduction transition cavity 15 and is efficiently introduced into the main heat dissipation channel 12 along the long axis of the elliptical cross-section. At the same time, the surface heat dissipation fins 14 of the tool body side 23 conduct natural convection heat dissipation with the external environment through the air convection gap 21, further reducing the overall temperature of the tool body 1.

[0038] When the tool is mounted on the machine tool spindle and the cooling air circuit is activated, compressed air enters the main heat dissipation channel 12 through the positioning cone hole 18. Because the spiral guide pattern 17 rotates in the opposite direction to the tool's rotation, the cooling gas forms strong turbulence within the main heat dissipation channel 12, significantly increasing the convective heat transfer coefficient. After absorbing heat, the cooling gas is discharged from the end of the mounting shank 6, completing one full forced cooling cycle.

[0039] The minute radius of curvature of the tip arc transition section 5, combined with the ultra-precision ground surface, forms a stable chip shape in the initial stage of workpiece entry, reducing instantaneous impact loads. The micro-concave arc-shaped cutting edge line of the main cutting edge 3 makes the cutting force more evenly distributed along the cutting edge, avoiding local overload. The tungsten carbide dispersion reinforcement layer 20 in the cutting edge region 19 significantly improves the wear resistance of the cutting edge and extends the tool life while maintaining the toughness of the matrix.

[0040] The reinforcing rib structure 27 not only enhances the structural rigidity of the front part of the blade body 1, but its grid-like layout also forms multiple heat conduction paths, accelerating the transfer of heat from the cutting edge area to the rear part of the blade body 1. The stress relief groove 16 effectively blocks the crack propagation path, preventing local damage from evolving into overall failure. The radial layout and gradually thinning structure design of the surface heat dissipation fins 14 ensures heat dissipation efficiency while avoiding new stress concentration points caused by structural abrupt changes.

[0041] The tool body 1 features a compact overall structure, with all functional components working in tandem to form a comprehensive solution integrating structural reinforcement, optimized thermal management, and improved surface wear resistance. This tool maintains stable geometric accuracy and cutting performance during prolonged high-speed cutting of difficult-to-machine materials such as high-strength alloys or precision mold steels, ensuring the reliability and consistency of the machining process.

[0042] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-wear-resistant powder metallurgy high-speed cutting tool, characterized in that: It includes a tool body (1), a cutting edge (2), a reinforcing rib structure (27), and a heat dissipation channel system (26), wherein: The blade body (1) is integrally pressed and sintered from powder metallurgy material, with the front end forming the main cutting area (25) and the rear end having a mounting shank (6). The cutting edge (2) is located at the front end of the tool body (1), including the main cutting edge (3), the secondary cutting edge (4) and the tip arc transition section (5) where the two meet. The cutting edge line of the main cutting edge (3) is slightly concave arc, and the secondary cutting edge (4) extends from the tip to the rear side of the tool body (1). The angle between its cutting edge and the cutting edge of the main cutting edge (3) is 75 to 85 degrees. The reinforcing rib structure (27) is located on the back of the blade (22) and includes several longitudinal reinforcing ribs (7) and transverse connecting ribs (8). The longitudinal reinforcing ribs (7) extend parallel to the direction of the main cutting edge (3), and the transverse connecting ribs (8) are perpendicular to the adjacent longitudinal reinforcing ribs (7) to form a grid-like support skeleton (11). The heat dissipation channel system (26) penetrates the interior of the blade body (1) and includes a main heat dissipation channel (12), a branch heat conduction groove (13) and surface heat dissipation fins (14). The main heat dissipation channel (12) is set along the central axis of the blade body (1). The branch heat conduction groove (13) extends obliquely from the main heat dissipation channel (12) to the root of the longitudinal reinforcing rib (24). The surface heat dissipation fins (14) are set on the side of the blade body (23) and are distributed radially.

2. The high wear-resistant powder metallurgy high-speed cutting tool according to claim 1, characterized in that: The radius of curvature of the blade tip arc transition section (5) is 0.2 mm to 0.4 mm, and the surface roughness Ra value is not greater than 0.1 micrometer.

3. The high wear-resistant powder metallurgy high-speed cutting tool according to claim 1, characterized in that: The width of the cutting edge (3) is 0.1 mm to 0.2 mm, and the surface of the cutting edge area (19) is provided with a tungsten carbide dispersion reinforcement layer (20) with a thickness of 10 to 20 micrometers.

4. The high wear-resistant powder metallurgy high-speed cutting tool according to claim 1, characterized in that: The mounting handle (6) has a hexagonal polygonal cross section (30) and a positioning cone hole (18) at the center of its end that is coaxially connected to the main heat dissipation channel (12).

5. A high-wear-resistant powder metallurgy high-speed cutting tool according to claim 1, characterized in that: The longitudinal reinforcing ribs (7) number three, with the central main reinforcing rib (9) being 20 percent higher than the auxiliary reinforcing ribs (10) on both sides; the transverse connecting ribs (8) number four, with the foremost rib being 1.5 millimeters behind the blade tip.

6. The high wear-resistant powder metallurgy high-speed cutting tool according to claim 1, characterized in that: Each branch heat conduction groove (13) is provided with a funnel-shaped heat conduction transition cavity (15) between the root of the corresponding longitudinal reinforcing rib (24), with a wide inlet and a narrow outlet.

7. The high wear-resistant powder metallurgy high-speed cutting tool according to claim 1, characterized in that: The total number of surface heat dissipation fins (14) is twelve, symmetrically distributed on the left and right, with six fins on each side. The root of the fins and the side of the blade body (23) are transitioned by a rounded chamfer (28) with a radius of 0.3 mm, and the ends are blunt ends (29).

8. A high-wear-resistant powder metallurgy high-speed cutting tool according to claim 1, characterized in that: The back of the blade (22) is provided with an annular closed stress relief groove (16), located outside the connection area between the reinforcing rib structure (27) and the main body of the blade (1).

9. A high-wear-resistant powder metallurgy high-speed cutting tool according to claim 1, characterized in that: The inner wall of the main heat dissipation channel (12) is provided with a spiral guide pattern (17) with a pitch of five millimeters, and the spiral direction is opposite to the normal rotation direction of the tool.

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