CNC cutting tool

Abstract

The invention discloses a CNC cutting tool which comprises a center rod and further comprises a reinforcing inner core installed in the center rod in an embedded mode, a plurality of sets of anti-torque reinforcing cores installed in the center rod in an embedded mode around the reinforcing inner core and cutting heads integrally formed at the two ends of the center rod. The CNC cutting tool has remarkable advantages, structurally, the reinforcing inner core and the torsion-resistant reinforcing core are embedded in the center rod, the two ends of the center rod are inserted into corresponding groove positions of the cutting head, connection is stable, force conduction is good, and cutting force is effectively resisted. In the aspect of material selection, the central rod adopts alloy tool steel containing tool steel, chromium, molybdenum and tungsten elements in a specific proportion to improve the strength; the reinforced inner core is a high-purity tungsten rod and is high in tensile strength; the torsion-resistant reinforced core is made of high-manganese steel subjected to solution treatment, and the torsion resistance is improved through unique tissue and element characteristics; the tungsten-cobalt alloy containing 25% of cobalt for the cutting head has high thermal conductivity and proper hardness and strength performance, the cutting efficiency is improved, and the service life is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of cutting tools, in particular to a CNC cutting tool. Background Art

[0002] As modern manufacturing industry is booming, the demand for precision machining is growing explosively. As the core means of precision machining, CNC (computer numerical control) cutting technology is widely used in many fields such as aerospace, automobile manufacturing, and electronic equipment production. With the intensification of industry competition, the requirements for CNC cutting tool performance are becoming increasingly stringent.

[0003] Traditional CNC cutting tools have exposed many limitations in actual use, and the problem of single function is particularly prominent. Many tools can only process one plane, which seems to be inadequate when faced with the task of processing complex parts. For example, in the field of aerospace, the shape of the blades of aircraft engines is extremely complex. Not only does it have a curved surface structure, but there are also plane features at multiple different angles. Using traditional tools that can only process one plane requires frequent tool replacement and adjustment of processing parameters, resulting in a cumbersome and time-consuming processing process, which greatly reduces production efficiency and increases processing costs.

[0004] In the automobile manufacturing industry, the design of automobile parts pays more and more attention to the balance between lightweight and high performance, and complex styling designs continue to emerge. For example, the internal structure of an automobile engine block contains multiple planes and hole systems in different directions and shapes. If a cutting tool with a single function is used, it is not only difficult to ensure the processing accuracy, but also makes the processing process extremely complicated, seriously affecting the production progress. In the manufacture of electronic equipment, as electronic products develop towards miniaturization and thinness, higher requirements are placed on the processing accuracy and complexity of parts. The manufacture of circuit boards requires the processing of multiple different planes and fine circuit grooves in a very small space. Traditional single-plane processing tools cannot meet such precise and diverse processing needs.

[0005] The Chinese utility model patent with authorization announcement number CN206936467U discloses a special cutting tool for CNC machining center, including a cutter head, a cutter head fixing part connected to the upper end of the cutter head, a positioning pin is arranged in the cutter head fixing part, the cutter head fixing part is connected to a handle mounting section, the handle mounting section is provided with an adjustment through hole, the handle mounting section is connected to the handle, the handle is provided with a handle through hole, the lower end of the handle is provided with an inclined surface, the cutter head includes a metal body, a blade part is provided on the metal body, a coating part is provided at the left end of the blade part, a lubrication groove is provided in the coating part, and a support part is provided at the right end of the blade part.

[0006] The above-mentioned public documents have a single function and cannot realize CNC cutting of multiple planes or even complex curved surfaces, which greatly increases the processing efficiency, processing time and cost. At the same time, it will cause tool wear and reduce accuracy during long-term complex processing tasks. Therefore, a CNC cutting tool is now needed. Summary of the invention

[0007] The purpose of the present invention is to provide a CNC cutting tool. According to the characteristics and regularity of CNC processing and the products to be processed, a tool that can cut three planes at one time is designed, and the original three processes are merged into one process, which reduces the time for disassembly and assembly of the fixture, greatly improves production efficiency, and thus solves the problem of single function of existing tools.

[0008] To achieve the above object, the present invention provides the following technical solution: a CNC cutting tool, comprising a center rod, a reinforcing inner core embedded and installed inside the center rod, a plurality of groups of torsion-resistant reinforcing cores embedded and installed inside the center rod around the reinforcing inner core, and

[0009] Cutting heads integrally formed at both ends of the center rod;

[0010] Each group of the cutting heads is provided with three groups of arc grooves, and a group of cutting surfaces for cutting is formed between two adjacent groups of the arc grooves;

[0011] A group of grooves is formed in the middle of each group of cutting surfaces.

[0012] Preferably, the center rod is an integrated structure made of alloy tool steel material.

[0013] Preferably, each group of the torsion-resistant reinforcement cores surrounds the outside of the reinforcement inner core at equal angles with the center point of the reinforcement inner core as the axis.

[0014] Preferably, both ends of the reinforcing inner core and the anti-torsion reinforcing core extend out from the inside of the central rod respectively, and the two groups of cutting heads are provided with insertion grooves and support grooves at positions corresponding to the reinforcing inner core and the anti-torsion reinforcing core respectively.

[0015] Preferably, the two groups of cutting heads are an integrated structure made of tungsten-cobalt alloy, and the arc groove is opened at an angle of 60°.

[0016] Preferably, the side of the outside of each group of arc-shaped grooves corresponding to the cut surface is a support surface, and the support surface is a plane, and the support surface is parallel to the central axis of the central rod.

[0017] Preferably, the cut surface is a one-centimeter plane, each group of the cut surface surfaces is provided with a group of adjustment surfaces, and each group of the adjustment surface surfaces is provided with a group of contact surfaces.

[0018] Preferably, the adjustment surface is opened at an angle of 45°, the contact surface is opened at an angle of 75°, and the outer end of the contact surface intersects with the support surface.

[0019] Preferably, the groove is a trapezoidal structure with two sides opening outward, the opening depth of the groove is smaller than the overall width of the cut surface, and the opening angles on both sides of the groove are 35° respectively.

[0020] Preferably, the grooves in each group are opened at the same height, and the surface of each group of grooves is opened with a cutting angle of 25°.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] This CNC cutting tool has significant advantages and has achieved remarkable results in tool type improvement, which has greatly improved processing efficiency. In terms of tool type design, the cutting head innovatively has three groups of arc grooves, and two adjacent groups of arc grooves directly form a group of cutting surfaces for cutting. Compared with traditional tools, the number of cutting surfaces has been significantly increased. Multiple cutting surfaces work together, so that the tool can remove more material in one cutting stroke, ensuring the use intensity of each cutting part. The adjustment surface and contact surface opened on the surface can flexibly adjust the opening angle according to different processing materials, which is different from the existing CNC cutting tools, realizes multi-functional cutting operations, and greatly improves the cutting efficiency of CNC cutting tools. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the overall structure of the center rod of the present invention;

[0026] Figure 4 It is a schematic diagram of the overall structure of the cutting head of the present invention.

[0027] In the figure: 1. center rod; 2. reinforced inner core; 3. anti-torsion reinforcement core; 4. cutting head; 5. plug-in groove; 6. support groove; 7. arc groove; 8. cutting surface; 9. adjustment surface; 10. contact surface; 11. groove; 12. support surface. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Please participate Figure 1 and Figure 2 The present invention provides a CNC cutting tool, comprising a center rod 1, a reinforcing inner core 2 embedded and installed inside the center rod 1, a plurality of groups of torsion-resistant reinforcing cores 3 embedded and installed inside the center rod 1 around the reinforcing inner core 2, and a cutting head 4 integrally formed at both ends of the center rod 1;

[0030] Each group of cutting heads 4 is provided with three groups of arc grooves 7 , and two adjacent groups of arc grooves 7 directly form a group of cutting surfaces 8 for cutting; a group of grooves 11 is provided in the middle of each group of cutting surfaces 8 .

[0031] In this embodiment, if Figure 2 As shown, the center rod 1 is made of alloy tool steel material, and the alloy tool steel material includes tool steel as the main body, and chromium, molybdenum, and tungsten elements used to improve the strength of the tool steel. The proportion of tool steel, chromium, molybdenum, and tungsten elements is 0.65:0.1.5:0.15:0.1.

[0032] In a further preferred embodiment, Figure 3 As shown, the reinforcing core 2 is a 99.95% tungsten rod, and the torsion-resistant reinforcing core 3 is a high manganese steel. Each group of torsion-resistant reinforcing cores 3 is surrounded by the outside of the reinforcing core 2 at equal angles with the center point of the reinforcing core 2 as the axis. The torsion-resistant reinforcing core 3 is arranged in a spiral shape. After the reinforcing core 2 and the torsion-resistant reinforcing core 3 are combined and stacked, the mixed center rod 1 raw material is poured and forged to form a finished center rod 1. After the center rod 1 is formed, the cutting head 4 raw material is poured at both ends of the center rod 1, and the forging is continued to form the center rod 1 and the cutting heads 4 at both ends into a whole, so as to better ensure the use strength of the cutting assembly. In addition, the higher the tungsten content, the greater the tensile strength. The torsion-resistant reinforcing core 3 contains about 13% manganese. The torsion-resistant reinforcing core 3 is solidified. After solution treatment and water toughening treatment, a single-phase austenite structure is formed, which will improve strength and plasticity. The austenite structure will undergo work hardening when subjected to force, which may help with torsion resistance because the material becomes harder during deformation and resists further deformation. The surface of the torsion reinforcement core 3 will harden under impact or extrusion, with a hardness of up to 450-550HBW, while the interior remains tough. This combination of surface hardening and internal toughness may mean that during torsion, the surface hardened layer can resist shear stress, while the internal toughness prevents crack propagation, thereby improving torsion resistance. Manganese can stabilize the austenite structure and increase hardenability, which may make the high manganese steel bear stress evenly during torsion, reduce local stress concentration, and improve torsional strength.

[0033] Further, such as Figure 3As shown, the two ends of the reinforcing inner core 2 and the anti-torsion reinforcing core 3 extend out from the center rod 1 respectively, and the two groups of cutting heads 4 are provided with insertion grooves 5 and support grooves 6 corresponding to the positions of the reinforcing inner core 2 and the anti-torsion reinforcing core 3 respectively. The reinforcing inner core 2 and the anti-torsion reinforcing core 3 extend out from the two ends of the center rod 1 and are inserted into the cutting head 4, which can better connect the center rod 1 and the cutting head 4, and better transmit the force to the center rod 1 during the use of the cutting head 4, and the reinforcing inner core 2 and the anti-torsion reinforcing core 3 arranged inside the center rod 1 can counteract the force generated in the cutting process, thereby better improving the overall use strength and service life of the product.

[0034] In addition, if Figure 4 As shown, two groups of cutting heads 4 adopt a tungsten-cobalt alloy structure, and the tungsten-cobalt alloy structure includes 25% cobalt content. The angle of the arc groove 7 opened on the outer arc surface of each group of cutting heads 4 is 60°. In order to avoid damage to the tool due to overheating during use, it is usually hoped that the alloy has a higher thermal conductivity, and the tungsten-cobalt alloy has a higher thermal conductivity. In addition, the linear expansion coefficient of the tungsten-cobalt alloy increases with the increase of the cobalt content. At the same time, in order to ensure the hardness of the cutting tool during use, the grain size of tungsten carbide can be refined to effectively improve the hardness of the alloy. The use of tungsten-cobalt alloy improves the cutting efficiency and service life of the tool. Like hardness, bending strength is a main property of cemented carbide. The bending strength of tungsten-cobalt alloy increases with the increase of cobalt content, but after the cobalt content exceeds 25%, the bending strength decreases with the increase of cobalt content. The compressive strength of tungsten-cobalt alloy decreases with the increase of cobalt content in the alloy, and increases with the fineness of tungsten carbide phase grains in the alloy. Therefore, fine grain alloys are added to match the hardness;

[0035] When the cobalt content increases from 2% to 25%, the hardness HRA of the alloy decreases from 93 to about 86. The hardness of the alloy decreases by 1 degree for every 3% increase in cobalt. At the same time, the thermal conductivity increases with the decrease in cobalt content, and the bending strength decreases after the cobalt content exceeds 25%. Therefore, a tungsten-cobalt alloy structure with a cobalt content of 25% is selected as the material of the cutting head 4, which greatly improves the service life of the product.

[0036] It is worth mentioning that Figure 4 As shown, the side of the outside of each group of arc grooves 7 corresponding to the cutting surface 8 is a supporting surface 12, and the supporting surface 12 is a plane, and the supporting surface 12 is opened parallel to the vertical center axis of the center rod 1, and the three supporting surfaces 12 opened by the cutting head 4 are in contact, which ensures that the cutting head 4 still has a certain use strength after opening the three groups of arc grooves 7. At the same time, when a single group of contact surfaces 10 contacts the product for cutting work, one group of support surfaces 12 will be subjected to force and the pressure will be distributed to the other two groups of support surfaces 12, and the torsional force will be received and transmitted through the cutting head 4 to share the use pressure of the cutting surface 8. In addition, the reinforced inner core 2 and the anti-torsion reinforcing core 3 arranged inside the center rod 1 can also greatly improve the use strength of the product itself when a single group of contact surfaces 10 is used for cutting.

[0037] As a preferred example, Figure 4 As shown, the cutting surface 8 is a one-centimeter plane, and each group of cutting surfaces 8 is provided with a group of adjustment surfaces 9 on the surface, and each group of adjustment surfaces 9 is provided with a group of contact surfaces 10 on the surface. The cutting surface 8 itself has a certain thickness when it is opened, so that the strength of each cutting part is improved. In order to better ensure the cutting performance of the cutting component for the material during use, the adjustment surface 9 and the contact surface 10 are provided on the surface of the cutting surface 8, and the opening angles of the adjustment surface 9 and the contact surface 10 can be adjusted according to different materials.

[0038] Further, in this embodiment, if Figure 4 As shown, the adjustment surface 9 is opened at an angle of 45°, the contact surface 10 is opened at an angle of 75°, and the outer end of the contact surface 10 intersects with the support surface 12. The angle of the contact surface 10 in this embodiment can better cut into the product, and at the same time, the adjustment surface 9 with a larger angle can better complete the cutting operation of the product.

[0039] Furthermore, Figure 4 As shown, the groove 11 is a trapezoidal structure with both sides opened outward, and the opening angles on both sides of the groove 11 are 35° respectively. The opening depth of the groove 11 will not cut off the cut surface 8. The opened groove 11 can perform open-loop operation on the product, thereby improving the diversity of product use.

[0040] In addition, if Figure 4 As shown, each group of grooves 11 is opened at the same height, and each group of grooves 11 has a 25° cutting angle in the opening direction corresponding to the adjustment surface 9 and the contact surface 10. The 25° opening of the grooves 11 improves the contact strength between the product and the material and reduces the risk of cutting.

[0041] Specifically, the structure of the tool includes a center rod 1, a reinforced inner core 2, a torsion-resistant reinforced core 3, a cutting head 4, and various groove and surface designs. Each product has different material and structural characteristics, such as the torsion resistance of high manganese steel, the high strength of tungsten rods, the hardness and bending strength of tungsten-cobalt alloys, etc. The torsion resistance of high manganese steel combined with the high strength of tungsten rods and the wear resistance of tungsten-cobalt alloys enable the tool to withstand greater force and heat during cutting and extend its service life. In addition, structural designs such as arc grooves and support surfaces disperse pressure and reduce stress concentration, while also providing impact resistance and work hardening characteristics through high manganese steel.

[0042] Advantages of this CNC cutting tool:

[0043] 1. Material combination optimization

[0044] Torsion-resistant reinforcement core (high manganese steel)

[0045] High manganese steel containing 13% manganese is used, and a single-phase austenite structure is formed after water toughening treatment. It has both high toughness and work hardening ability. The hardness of the surface layer can reach 450-550HBW when subjected to torsion, which significantly improves the shear stress resistance. The manganese element stabilizes the austenite structure, reduces stress concentration, evenly distributes the torsional load, and inhibits crack propagation.

[0046] Strengthen the inner core (99.95% tungsten rod)

[0047] Tungsten rod has high tensile strength (>2000MPa) and high temperature resistance (melting point 3422℃). As the central support shaft, it can stably transmit cutting torque and prevent deformation of the rod body. The high thermal conductivity (173W / m·K) is matched with the tungsten-cobalt alloy of the cutting head to accelerate heat conduction and reduce thermal stress damage.

[0048] Cutting head (25% cobalt tungsten cobalt alloy)

[0049] Optimized cobalt content balances bending strength and hardness (HRA≈86), and refined tungsten carbide grains improve the wear resistance of the cutting surface and extend tool life. High compressive strength (>4000MPa) supports complex cutting conditions and reduces the risk of chipping.

[0050] 2. Structural Mechanics Strengthening

[0051] Torsion-resistant composite structure

[0052] The torsional reinforcement core 3 surrounds the tungsten rod 2 at a spiral angle, and a dense laminated structure is formed by casting and forging, which synergistically improves the torsional stiffness and toughness of the center rod.

[0053] Force transmission design

[0054] The reinforced inner core 2 and the torsion-resistant reinforced core 3 extend to the inserting slot 6 of the cutting head 4, so as to evenly distribute the cutting force to the center rod 1 and reduce the local stress concentration.

[0055] Optimization of arc groove 6 and support surface 11

[0056] The arc groove 6 and the support surface 12 form a three-way force network, so that the pressure 8 of a single cutting surface is shared by multiple groups of support surfaces 12, reducing the risk of fatigue fracture.

[0057] 3. Comprehensive performance improvement

[0058] As shown in the following table

[0059]

[0060] 4. Process synergy

[0061] Water toughening treatment: The torsion-resistant strengthening core 3 is solution treated to eliminate carbides, ensure the uniformity of austenite, and enhance the response speed of work hardening.

[0062] Segmented forging: The center rod 1 and the cutting head 4 are forged as one piece to reduce interface defects and increase the bonding strength by more than 25%.

[0063] In addition, CNC machining controls the tool path through a computer program to achieve micron-level machining accuracy (±0.01mm), which is especially suitable for high-demand fields such as aerospace and medical equipment. It has high repeatability and significantly better part size consistency during mass production than traditional processes. It supports multi-axis linkage (such as five-axis machining) and can efficiently complete the machining of complex structures such as curved surfaces and special-shaped holes, breaking through the limitations of traditional machine tool processes. This new type of CNC cutting tool is excellent in improving product processing efficiency in all aspects. Working from the material end, we lay a solid foundation for efficient processing. The high-manganese steel torsion-resistant reinforcing core containing 13% manganese has a single-phase austenite structure after water-toughening treatment. During cutting, its surface torsion hardness can quickly soar to 450-550HBW. This excellent shear stress resistance allows the tool to operate stably in high-torque processing scenarios, effectively ensuring the continuity of processing, avoiding processing stagnation caused by tool torsion problems, and providing solid support for the smooth advancement of efficient processing. The 99.95% tungsten rod reinforced core has ultra-high tensile strength (>2000MPa) and high temperature resistance (melting point up to 3422℃), which can stably transmit cutting torque during high-speed cutting, effectively prevent deformation of the rod body, and ensure that the tool always cuts accurately; its high thermal conductivity (173W / m·K) works together with the tungsten-cobalt alloy of the cutting head to quickly conduct the heat generated by cutting, reduce the adverse effects of thermal stress on the tool, keep the tool in the best cutting state at all times, and significantly improve processing efficiency.

[0064] The 25% cobalt tungsten-cobalt alloy used in the cutting head 4 also performs well. By subtly optimizing the cobalt content, it successfully achieves a balance between bending strength and hardness (HRA≈86), while refining the tungsten carbide grains, greatly improving wear resistance. This allows the tool to remain sharp during long-term processing, greatly reducing the frequency of tool changes; its compressive strength of up to >4000MPa is sufficient to support complex cutting conditions, reduce the risk of chipping, ensure the consistency and efficiency of the processing process, and provide a reliable guarantee for improving processing efficiency.

[0065] Three groups of arc grooves 7 are respectively provided on the knife type improvement level, and adjacent arc grooves 7 form cutting surfaces 8 for cutting. This innovative design significantly increases the number of cutting surfaces 8. Multiple cutting surfaces 8 are involved in the work at the same time, so that the tool can remove more materials in a single cutting stroke, greatly improving the cutting efficiency. The design of the cutting surface 8 itself is also very sophisticated, and the overall thickness is certain, which effectively guarantees the use strength of each cutting part. The adjustment surface and contact surface provided on its surface can flexibly adjust the opening angle according to the characteristics of different processed materials. Taking this embodiment as an example, the adjustment surface 9 is provided at an angle of 45°, and the contact surface 10 is provided at an angle of 75°. The outer end of the contact surface 10 intersects with the support surface 12. Such a subtle angle combination enables the tool to better cut into the product, and combined with the adjustment surface with a larger angle, it can more efficiently complete the cutting operation of the product, further improving the efficiency and quality of a single cutting.

[0066] In addition, the three supporting surfaces 12 of the cutting head 4, which are perpendicular to the center rod at 90° and in contact with each other, play a key role. After the three sets of arc grooves 7 are opened, these supporting surfaces 12 ensure that the cutting head 4 still has sufficient strength. When a single set of contact surfaces 10 contacts the product for cutting, one set of supporting surfaces 12 can quickly distribute the pressure to the other two sets of supporting surfaces 12 after being stressed, and receive and transmit the torsional force through the cutting head 4, effectively sharing the use pressure borne by the cutting surface 8, ensuring the stability of the cutting process, and creating favorable conditions for efficient processing.

[0067] In terms of structural design, the torsion-resistant reinforcing core 3 surrounds the tungsten rod at a unique spiral angle, and is cast and forged to form a dense laminated torsion-resistant composite structure, which greatly improves the torsion-resistant rigidity and toughness, ensures the stability of the tool during high-speed cutting, and avoids processing errors and reduced efficiency caused by torsion instability. The reinforcing inner core 2 and the torsion-resistant reinforcing core 3 extend to the inside of the insertion slot 5 and the support slot 6, evenly dispersing the cutting force and ensuring that the various parts of the tool work together efficiently when subjected to strong cutting.

[0068] The process level also enables efficient processing. Water toughening treatment carefully optimizes the microstructure of the torsion-resistant reinforcing core, significantly enhancing the response speed of work hardening, allowing the tool to quickly adapt to changes in external forces during the cutting process and continuously maintain efficient cutting capabilities; the segmented forging process reduces the interface defects between the center rod and the cutting head, increasing the bonding strength by more than 25%, making the tool as a whole strong and durable, and running stably and continuously in high-intensity processing; CNC processing technology achieves micron-level accuracy (±0.01mm) and high repeatability, effectively ensuring the consistency of mass-produced products, and supports multi-axis linkage, which can efficiently complete the processing of complex structures such as curved surfaces and special-shaped holes, greatly broadening the processing range, fully meeting the efficient processing needs of diversified products, and comprehensively improving product processing efficiency from all dimensions.

[0069] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A CNC cutting tool, comprising a center rod (1), characterized in that: It also includes a reinforcing inner core (2) embedded and installed inside the central rod (1), a plurality of groups of torsion-resistant reinforcing cores (3) embedded and installed inside the central rod (1) around the reinforcing inner core (2), and Cutting heads (4) integrally formed at both ends of the center rod (1); Each group of the cutting heads (4) is provided with three groups of arc-shaped grooves (7), and a group of cutting surfaces (8) for cutting is formed between two adjacent groups of the arc-shaped grooves (7); A group of grooves (11) is formed in the middle of each group of the cut surfaces (8).

2. A CNC cutting tool according to claim 1, characterized in that: The central rod (1) is an integrated structure made of alloy tool steel material.

3. A CNC cutting tool according to claim 2, characterized in that: Each group of the torsion-resistant reinforcing cores (3) surrounds the outside of the reinforcing inner core (2) at equal angles with the center point of the reinforcing inner core (2) as the axis.

4. A CNC cutting tool according to claim 3, characterized in that: The two ends of the reinforcing inner core (2) and the anti-torsion reinforcing core (3) extend out from the inside of the central rod (1), respectively, and the two groups of cutting heads (4) are provided with insertion grooves (5) and support grooves (6) at positions corresponding to the reinforcing inner core (2) and the anti-torsion reinforcing core (3), respectively.

5. A CNC cutting tool according to claim 4, characterized in that: The two groups of cutting heads (4) are an integrated structure made of tungsten-cobalt alloy, and the arc groove (7) is opened at an angle of 60°.

6. A CNC cutting tool according to claim 5, characterized in that: The side of the outside of each group of arc-shaped grooves (7) corresponding to the cut surface (8) is a support surface (12), and the support surface (12) is a plane, and the support surface (12) is parallel to the central axis of the central rod (1).

7. A CNC cutting tool according to claim 6, characterized in that: The cut surfaces (8) are one centimeter planes, each group of the cut surfaces (8) is provided with a group of adjustment surfaces (9) on its surface, and each group of the adjustment surfaces (9) is provided with a group of contact surfaces (10) on its surface.

8. A CNC cutting tool according to claim 7, characterized in that: The adjustment surface (9) is opened at an angle of 45°, the contact surface (10) is opened at an angle of 75°, and the outer end of the contact surface (10) intersects with the support surface (12).

9. A CNC cutting tool according to claim 8, characterized in that: The groove (11) is a trapezoidal structure with two sides opening outwards, and the opening angles on both sides of the groove (11) are 35° respectively.

10. A CNC cutting tool according to claim 9, characterized in that: The opening heights of the grooves (11) of each group are consistent, and the surface of the grooves (11) of each group is provided with a cutting angle of 25°.

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