Method for preparing hard alloy cutter and cutting blade with core part provided with incomplete covering coating

Abstract

The invention discloses a method for preparing a hard alloy cutter with an incomplete covering coating on a core part and a cutting blade. The hard alloy cutter comprises a clamping part and a cutting part, the cutting part comprises a front cutter surface, a rear cutter surface, an auxiliary rear cutter surface, a main cutting edge formed by intersecting the front cutter surface and the rear cutter surface, and an auxiliary cutting edge formed by intersecting the front cutter surface and the auxiliary rear cutter surface; the method for preparing the hard alloy cutter with the incomplete covering coating on the core comprises the following steps that S1, the hard alloy cutter to be coated is placed and then fed into a chemical coating furnace or a physical coating furnace, and a first pre-coating completely covering a cutting part of the hard alloy cutter to be coated is prepared; s2, the first precoating on at least one of the front tool face, the rear tool face and the auxiliary rear tool face of the cutting part is subjected to material removal machining, and a first coating incompletely covering the core part of the hard alloy tool is formed; and S3, the whole to-be-coated hard alloy cutter is fed into a physical coating furnace, and a second coating completely covering the cutting part of the to-be-coated hard alloy cutter is prepared. The method can be used for preparing the hard alloy cutter and the cutting blade which are high in cutting efficiency and long in service life and are provided with the incompletely-covered coating at the core part.

Description

Technical Field

[0001] This invention relates to the preparation of metal cutting tools, and more particularly to a method for preparing a cemented carbide cutting tool and cutting insert with an incompletely covered coating on the core. Background Technology

[0002] Carbide cutting tools experience high friction during cutting, leading to built-up edge formation on the rake face and rapid wear on the flank face due to high cutting speeds. This limits their application to low-speed cutting conditions and results in a short tool life. Current technologies typically employ coating processes on the tool surface, applying a certain thickness of carbide, nitride, or oxide compounds. This imparts high hardness, high wear resistance, high heat resistance, and a low coefficient of friction to the tool surface, effectively reducing built-up edge formation on the rake face and flank wear, thereby improving cutting performance and tool life.

[0003] In existing technologies, the manufacturing process of solid carbide cutting tools generally involves grinding and passivation to obtain an uncoated tool, followed by surface treatment such as cleaning, before being transferred to a coating process to complete the coating. The manufacturing process of replaceable carbide cutting tools typically involves powder molding and sintering to obtain a blank, followed by grinding and surface treatment of the interface clamping part and cutting part, before being transferred to a coating furnace for a coating process to complete the coating. Through multiple physical or chemical coating processes, a coating of similar thickness and composition is formed on the tool surface, thereby improving tool performance. However, due to the sharp cutting edge, the coating is easily peeled off at the cutting edge. The tool surface can only be covered with a thin film coating of similar composition and thickness, resulting in a relatively simple coating structure. Furthermore, due to limitations in coating processes and material properties, it is impossible to simultaneously achieve multiple performance indicators such as wear resistance, heat resistance, impact resistance, and high hardness. In particular, it is difficult to simultaneously meet the requirements of low wear rate on the external cutting edge, good impact resistance on the internal cutting edge, and scratch resistance of the secondary flank coating. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a method for preparing carbide cutting tools with a partially covered coating on the core, which can improve the cutting efficiency and service life of the prepared carbide cutting tools / inserts.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A method for preparing a cemented carbide cutting tool with a partially coated core, the cutting tool comprising a clamping portion and a cutting portion, the cutting portion comprising a rake face, a flank face, a secondary flank face, a primary cutting edge formed by the intersection of the rake face and the flank face, and a secondary cutting edge formed by the intersection of the rake face and the secondary flank face, the method comprising the following steps: S1: After placing the carbide tool to be coated, send it into a chemical coating furnace or a physical coating furnace to prepare a first pre-coating that completely covers the cutting part of the carbide tool to be coated. S2: Perform material removal processing on at least one of the rake face, flank face and secondary flank face of the cutting part to form a first coating that does not completely cover the core of the carbide tool. S3: The carbide tool to be coated is fed into a physical coating furnace to prepare a second coating that completely covers the cutting part of the carbide tool.

[0006] As a further improvement to the above technical solution: In step S2, material removal processing is performed only on the first pre-coating layer on the rake face of the cutting part to form the first coating layer.

[0007] In step S2, material removal processing is performed only on the first pre-coating layer on the flank face of the cutting part to form the first coating layer.

[0008] In step S2, material removal processing is performed only on the first pre-coating layer on the secondary flank face of the cutting part to form the first coating layer.

[0009] In step S2, material removal is performed only on the inner rake face to form the first coating.

[0010] In step S2, material removal is performed only on the outer rake face to form the first coating.

[0011] Following step S3, the following steps are also included: S4. Perform material removal processing on the first and second coatings on the inner rake face and / or outer rake face and / or flank face and / or secondary flank face to form an area on the first and second coatings that does not completely cover the core of the carbide tool. S5. The carbide tool to be coated is fed into a physical coating furnace to prepare a second coating that completely covers the cutting part of the carbide tool.

[0012] Before step S3, the cutting edge of the cemented carbide tool to be coated after the first coating preparation is subjected to jet treatment using corundum particles with a particle size of 120-150 mesh and a jet time of 1-3 minutes.

[0013] After step S3, the cutting edge of the cemented carbide tool to be coated after the second coating preparation is subjected to jet treatment using corundum particles with a particle size of 120-150 mesh and a jet time of 1-3 minutes.

[0014] The first coating is an Al2O3 and / or Ti(C,N) coating.

[0015] The second coating is a (Ti, Al)N and / or (Ti, Cr)N and / or (Ti, Si)N and / or (Ti, Zr)N coating.

[0016] The second coating is a (Ti, Al, Cr)N and / or (Ti, Al, Zr)N and / or (Ti, Al, Si)N and / or (Ti, Al, Y)N coating.

[0017] The first coating is a (Ti, Al)N and / or (Ti, Cr)N and / or (Ti, Si)N and / or (Ti, Zr)N coating.

[0018] The second coating is a (Ti, Al)N and / or (Ti, Cr)N and / or (Ti, Si)N and / or (Ti, Zr)N coating.

[0019] The first coating is a (Ti, Al, Cr)N and / or (Ti, Al, Zr)N and / or (Ti, Al, Si)N and / or (Ti, Al, Y)N coating.

[0020] The second coating is a (Ti, Al, Cr)N and / or (Ti, Al, Zr)N and / or (Ti, Al, Si)N and / or (Ti, Al, Y)N coating.

[0021] The second coating is a (Ti, Al)N and / or (Ti, Cr)N and / or (Ti, Si)N and / or (Ti, Zr)N coating.

[0022] A method for preparing a cutting insert with a partially coated core, the cutting insert being plate-shaped, including a lower support portion and an upper cutting portion, the cutting portion including a rake face, a flank face, and a cutting edge formed by the intersection of the rake face and the flank face, the method comprising the following steps: S1: After the cutting blade to be coated is placed, it is sent into a chemical coating furnace or a physical coating furnace to prepare a first pre-coating that completely covers the cutting part of the cutting blade to be coated. S2: Perform material removal processing on at least one region of the first pre-coating on the rake face and / or flank face of the cutting part to form a first coating that does not completely cover the cutting part; S3: The cutting insert to be coated is fed into a physical coating furnace to prepare a second coating that completely covers the cutting part of the cutting insert.

[0023] As a further improvement to the above technical solution: The rake face includes a primary rake face and a secondary rake face, and the flank face includes a primary flank face and a secondary flank face. The primary rake face and the primary flank face intersect to form a primary cutting edge, and the secondary rake face and the secondary flank face intersect to form a secondary cutting edge. In step S2, the first pre-coating material is removed from at least one area of ​​the primary rake face and / or the secondary rake face and / or the primary flank face and / or the secondary flank face to form a first coating that does not completely cover the cutting part.

[0024] Compared with the prior art, the advantages of the present invention are as follows: The present invention discloses a method for preparing a cemented carbide cutting tool with a partially covered core coating. The method involves removing material from at least one of the rake face, flank face, and secondary flank face using a material removal process such as grinding. This removes material from the first pre-coating layer, forming a first coating that partially covers the core of the cemented carbide cutting tool. A second coating that completely covers the cutting edge of the tool is then applied to the surface of the first coating. In other words, the method of the present invention can effectively reduce coating stress on the cutting edge, decrease chip deformation and cutting force on the rake face, flank face, and secondary flank face, prevent rapid wear of the rake and flank faces, inhibit coating peeling, and improve cutting efficiency and cutting life, based on the different cutting edges and their groove structures and cutting conditions at various points on the cutting edge of the tool. In particular, the cutting speeds of the internal and external cutting edges of carbide cutting tools differ significantly. The external cutting edge is sharp and has a high cutting speed, leading to rapid wear, while the internal cutting edge has a small rake angle and low speed, resulting in severe chip compression and easy breakage. The coating preparation method of this invention allows for multiple coating combinations, such as a second coating on the rake face of the internal cutting edge and both a first and second coating on the rake face of the external cutting edge. This improves the consistency of the lifespan of the internal and external cutting edges and reduces tool application costs. Since the first pre-coating uses a chemical coating furnace or a physical coating furnace, while the second coating uses a physical coating furnace, overlapping combinations of chemical and physical coatings can be achieved, resulting in multiple coating combinations, structural stability, and good impact resistance and wear resistance.

[0025] The present invention discloses a method for preparing a cutting insert with a partially coated core. The method involves preparing a cutting insert with a partially coated core, wherein at least one area on the rake face and / or flank face adjacent to the cutting edge of the cutting portion is not covered by the first coating. This area is only covered by the second coating, which improves the cutting edge's sharpness and impact resistance. Meanwhile, other areas are simultaneously covered by both the first and second coatings, ensuring resistance to groove wear on the rake face and wear on the flank face. By adjusting the coating type, thickness, composition, and number of layers in different cutting areas of the cutting insert, the cutting edge's sharpness, impact resistance, and resistance to wear on the rake and flank faces can be synergistically improved, greatly enhancing the cutting efficiency, cutting life, and cutting stability of the cutting insert. Furthermore, a single cutting insert can meet various cutting conditions, broadening the cutting application range of the cutting insert. Attached Figure Description

[0026] Figure 1 This is a perspective view of the first coating of a first embodiment of the method for preparing a cemented carbide cutting tool with an incompletely covered coating in the core, according to the present invention. Figure 2 This is a perspective view of the second coating of a first embodiment of the method for preparing a cemented carbide cutting tool with an incompletely covered coating in the core, according to the present invention; Figure 3 yes Figure 2 AA view; Figure 4 This is a perspective view of the first coating of a second embodiment of the method for preparing a cemented carbide cutting tool with an incompletely covered coating in the core, according to the present invention; Figure 5 This is a perspective view of the second coating of a second embodiment of the method for preparing a cemented carbide cutting tool with an incompletely covered coating in the core, according to the present invention; Figure 6 yes Figure 5 BB view; Figure 7 This is a perspective view of the first coating of a third embodiment of the method for preparing a cemented carbide cutting tool with an incompletely covered coating in the core, according to the present invention. Figure 8 This is a perspective view of the second coating of a third embodiment of the method for preparing a cemented carbide cutting tool with an incompletely covered coating in the core, according to the present invention; Figure 9 yes Figure 8 CC view; Figure 10 This is a perspective view of a cutting blade prepared by the method of the present invention, which has a core with an incompletely covered coating. Figure 11 This is a schematic diagram of the first coating of a cutting blade prepared by the method of the present invention for preparing a cutting blade with a core having an incompletely covered coating; Figure 12 yes Figure 11 Enlarged view at point D; Figure 13 This is a schematic diagram of the second coating of a cutting blade prepared by the method of the present invention for preparing a cutting blade with a core having an incompletely covering coating.

[0027] The labels in the diagram represent: 101. First pre-coating layer; 11. First coating layer; 12. Second coating layer; 1. Carbide tool to be coated; 2. Clamping part; 21. Support part; 3. Cutting part; 4. Rake face; 41. Inner rake face; 42. Outer rake face; 401. Main rake face; 402. Secondary rake face; 5. Flank face; 51. Main flank face; 6. Secondary flank face; 7. Main cutting edge; 71. Inner cutting edge; 72. Outer cutting edge; 8. Secondary cutting edge; 91. Chip groove; 92. Center groove; 10. Tool body. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "horizontal", "inner", "outer", "top", "bottom", etc., which indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this invention 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 invention.

[0030] Figures 1 to 3 This diagram illustrates a carbide tool prepared according to a first embodiment of the method for preparing a carbide tool with an incompletely covered core coating using the present invention. The carbide tool with an incompletely covered core coating includes a clamping portion 2 and a cutting portion 3. The cutting portion 3 includes a rake face 4, a flank face 5, a secondary flank face 6, a main cutting edge 7 formed by the intersection of the rake face 4 and the flank face 5, and a secondary cutting edge 8 formed by the intersection of the rake face 3 and the secondary flank face 6. The method for preparing the carbide tool with an incompletely covered core coating includes the following steps: S1: After placing the carbide tool 1 to be coated, send it into a chemical coating furnace to prepare a first pre-coating 101 that completely covers the cutting part 3 of the carbide tool 1 to be coated; S2: Material removal is performed only on the first pre-coating layer 101 on the rake face 4 of the cutting part 3 to form a first coating layer 11 that does not completely cover the core of the carbide tool. S3: The carbide tool 1 to be coated is fed into a physical coating furnace to prepare a second coating 12 that completely covers the cutting part 3 of the carbide tool 1 to be coated.

[0031] The method of the present invention for preparing a cemented carbide cutting tool with a partially covered core coating can prepare a cemented carbide cutting tool with a partially covered core coating by performing material removal processing on the first pre-coating 101 on the rake face 4 through material removal processing methods such as grinding, forming a first coating 11 that does not completely cover the core of the cemented carbide cutting tool (e.g., ...). Figure 1 As shown), and a second coating 12 is provided on the surface of the first coating 11 to completely cover the cutting part of the tool (as shown). Figure 2 As shown in the figure, the method for preparing a carbide cutting tool with a partially coated core in this embodiment involves removing material from the first pre-coating 101 on the rake face 4 of the cutting part 3. Only the second coating is ultimately formed on the rake face 4. This effectively reduces the coating stress on the cutting edge corresponding to the rake face 4, reduces chip deformation and cutting force on the rake face 4, avoids rapid wear of the rake face 4, inhibits coating peeling, and improves cutting efficiency and cutting life. Since the first pre-coating 101 is applied using a chemical coating furnace, while the second coating 12 is applied using a physical coating furnace, an overlapping combination of chemical and physical coatings can be achieved, resulting in multiple coating combinations, stable structure, and good impact resistance and wear resistance.

[0032] In this embodiment, in step S2, only the inner rake face 41 on the rake face 4 is subjected to material removal processing to form the first coating 11. The cutting speed difference between the inner and outer cutting edges at the end of the carbide cutting tool is large. The outer cutting edge is sharp and has a high cutting speed, which makes it prone to rapid wear. The inner cutting edge has a small rake angle and low speed, resulting in severe chip compression and easy chipping. Through the coating preparation method of the present invention, it is possible to achieve multiple coating combinations such as the inner rake face 41 corresponding to the inner cutting edge having only a second coating, while the outer rake face 42 corresponding to the outer cutting edge having both the first and second coatings. This improves the consistency of the life of the inner and outer cutting edges and reduces the cost of tool application.

[0033] In this embodiment, after step S3, the following steps are also included: S4. Perform material removal processing on the first coating 11 and the second coating 12 on the inner rake face 41 and the outer rake face 42 to form an area that does not completely cover the core of the carbide tool on the first coating 11 and the second coating 12. S5. The carbide tool 1 to be coated is sent into a physical coating furnace to prepare a second coating 12 that completely covers the cutting part 3 of the carbide tool 1.

[0034] The resulting carbide tool coating consists of a first coating 11 that does not completely cover the cutting part 3, one or more sets of second coatings 12 that do not completely cover the cutting part 3, and a second coating 11 that completely covers the cutting part 3. The coating structure can be set according to the different cutting edges and groove structures and cutting conditions at various parts of the tool cutting part to further improve cutting efficiency and cutting life.

[0035] In this embodiment, before step S3, the cutting edge of the cemented carbide tool 1 to be coated after the first coating 11 is prepared is subjected to jet treatment using corundum particles with a particle size of 120-150 mesh and a jet time of 1-3 minutes.

[0036] In this embodiment, after step S3, the cutting edge of the cemented carbide tool 1 to be coated after the second coating 12 is prepared is subjected to jet treatment, using corundum particles with a particle size of 120-150 mesh, and the jet time is 1-3 minutes.

[0037] In this embodiment, the first coating 11 is an Al2O3 and / or Ti(C,N) coating.

[0038] In this embodiment, the second coating 12 is a (Ti, Al)N and / or (Ti, Cr)N and / or (Ti, Si)N and / or (Ti, Zr)N coating.

[0039] Figures 4 to 6 A schematic diagram is shown of a carbide tool prepared according to a second embodiment of the method for preparing a carbide tool with an incompletely covered coating on the core, which is mainly used for drilling. The method for preparing a carbide tool with an incompletely covered coating on the core includes the following steps: S1: After placing the carbide tool 1 to be coated, send it into a physical coating furnace to prepare a first pre-coating 101 that completely covers the cutting part 3 of the carbide tool 1 to be coated; S2: The first pre-coating 101 on the inner rake face 41 and outer rake face 42 of the cutting part 3 is subjected to material removal machining to form a first coating 11 that does not completely cover the core of the carbide tool (e.g., Figure 4 ); S3: The carbide tool 1 to be coated is fed into a physical coating furnace to prepare a second coating 12 that completely covers the cutting part 3 of the carbide tool 1 (e.g., ...). Figure 5 ).

[0040] When machining low-strength, high-toughness materials such as Q235 steel, removing the first pre-coating 101 from the inner rake face 41 and outer rake face 42 of the cutting part 3 can improve the sharpness of the cutting edge, thereby ensuring light load during the cutting process and the stability of the chip curl radius. At the same time, the flank face of the cutting part 3 is provided with both the first coating 11 and the second coating 12, which can reduce the flank face wear rate and improve the tool cutting life.

[0041] In this embodiment, the first coating 11 is a (Ti, Al)N and / or (Ti, Cr)N and / or (Ti, Si)N and / or (Ti, Zr)N coating.

[0042] In this embodiment, the second coating 12 is a (Ti, Al)N and / or (Ti, Cr)N and / or (Ti, Si)N and / or (Ti, Zr)N coating.

[0043] Figures 7 to 9 This diagram illustrates a carbide tool prepared according to a third embodiment of the method for preparing a carbide tool with an incompletely covered coating on the core, as described in this invention. This carbide tool is mainly used for milling. The carbide tool fixes the cutting part 3 to the tool body 10 by clamping part 2. The cutting part 3 is provided with a chip groove 91 and a center groove 92. The cutting part 3 includes a rake face 4 on the chip groove 91, a flank face 5 at the end, a main cutting edge 7 formed by the intersection of the rake face 4 and the flank face 5, a secondary flank face 6, and a secondary cutting edge 8 formed by the intersection of the rake face 4 and the secondary flank face 6. The rake face 4 includes an inner rake face 41 and an outer rake face 42. The difference between this embodiment and the previous embodiment is only that in this embodiment, in step S2, only the first pre-coating layer 101 on the inner rake face 41 and the secondary flank face 6 of the cutting part 3 is subjected to material removal processing to form the first coating layer 11.

[0044] When machining high-strength, low-toughness materials such as 42Cr mold steel, removing the first pre-coating 101 from the inner rake face 41 and secondary flank face 6 of the cutting part 3 can reduce the strength of the cutting edge at low cutting speeds, avoid chipping or severe crater wear of the cutting part 3 caused by intermittent compression between the chips and the inner rake face 41 of the tool during cutting, and reduce the risk of coating peeling off the secondary cutting edge 8 on the secondary flank face 6, thereby improving the surface quality of the machined sidewall. In this embodiment, the first coating 11 is a (Ti, Al, Cr)N and / or (Ti, Al, Zr)N and / or (Ti, Al, Si)N and / or (Ti, Al, Y)N coating.

[0045] In this embodiment, the second coating 12 is a (Ti, Al, Cr)N and / or (Ti, Al, Zr)N and / or (Ti, Al, Si)N and / or (Ti, Al, Y)N coating.

[0046] In addition to the above embodiments, in step S2, the material removal process can be performed only on the first pre-coating 101 on the secondary flank face 6 of the cutting part 3 to form the first coating 11.

[0047] The second coating can also be configured as a (Ti, Al, Cr)N and / or (Ti, Al, Zr)N and / or (Ti, Al, Si)N and / or (Ti, Al, Y)N coating.

[0048] Figures 10 to 13This diagram illustrates a cutting insert prepared by the method of the present invention, which provides a cutting insert with a partially coated core. The cutting insert is plate-shaped and includes a lower support portion 21 and an upper cutting portion 3. The cutting portion 3 includes a rake face 4, a flank face 5, and a cutting edge formed by the intersection of the rake face 4 and the flank face 5. The method for preparing the cutting insert with a partially coated core includes the following steps: S1: After the cutting blade to be coated is placed, it is sent into a chemical coating furnace or a physical coating furnace to prepare a first pre-coating 101 that completely covers the cutting part 3 of the cutting blade to be coated; S2: Perform material removal processing on at least one region of the first pre-coating 101 on the rake face 4 and / or flank face 5 of the cutting part 3 to form a first coating 11 that does not completely cover the cutting part 3 (e.g., ...). Figure 11 (as shown) S3: The cutting insert 1 to be coated is fed into a physical coating furnace to prepare a second coating 12 that completely covers the cutting portion 3 of the cutting insert 1 (e.g., ...). Figure 12 (As shown).

[0049] The cutting insert prepared by the method of the present invention having a core with an incompletely covered coating has at least one area on the rake face and / or flank face adjacent to the cutting edge that is not covered by the first coating. This area is only covered by the second coating, which can improve the cutting sharpness and impact resistance of the cutting edge. That is, other areas are covered by both the first and second coatings, which can ensure the resistance of the rake face to groove wear and the wear resistance of the flank face in other areas. In other words, by adjusting the multi-combination of coating type, thickness, composition and number of layers in different cutting areas of the cutting insert, the cutting sharpness, impact resistance and resistance to wear of the rake and flank faces of the cutting insert can be synergistically improved, which greatly improves the cutting efficiency, cutting life and cutting stability of the cutting insert. Moreover, a single cutting insert can meet a variety of different cutting conditions, thus broadening the cutting application range of the cutting insert.

[0050] In this embodiment, the rake face 4 includes a main rake face 401 and a secondary rake face 402, and the flank face 5 includes a main flank face 51 and a secondary flank face 6. The main rake face 401 and the main flank face 51 intersect to form a main cutting edge 7, and the secondary rake face 402 and the secondary flank face 52 intersect to form a secondary cutting edge 8. In step S2, the first pre-coating layer 101 of at least one area of ​​the main rake face 401, the secondary rake face 402 and the secondary flank face 6 is subjected to material removal processing to form a first coating layer 11 that does not completely cover the cutting part 3.

[0051] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A method for preparing a cemented carbide cutting tool with a partially coated core, the cemented carbide cutting tool with a partially coated core comprising a clamping part (2) and a cutting part (3), the cutting part (3) comprising a rake face (4), a flank face (5), a secondary flank face (6), a main cutting edge (7) formed by the intersection of the rake face (4) and the flank face (5), and a secondary cutting edge (8) formed by the intersection of the rake face (4) and the secondary flank face (6), characterized in that, A method for preparing a cemented carbide cutting tool with an incompletely covered core coating includes the following steps: S1: After placing the carbide tool (1) to be coated, send it into a chemical coating furnace or a physical coating furnace to prepare a first pre-coating (101) that completely covers the cutting part (3) of the carbide tool (1) to be coated. S2: Perform material removal processing on at least one of the rake face (4), flank face (5) and secondary flank face (6) of the cutting part (3) to form a first coating (11) that does not completely cover the core of the carbide tool. S3: The carbide tool (1) to be coated is fed into the physical coating furnace to prepare a second coating (12) that completely covers the cutting part (3) of the carbide tool (1).

2. The method for preparing a cemented carbide cutting tool with an incompletely covered core coating according to claim 1, characterized in that: In step S2, material removal processing is performed only on the first pre-coating layer (101) on the rake face (4) of the cutting part (3) to form the first coating layer (11).

3. The method for preparing a cemented carbide cutting tool with an incompletely covered core coating according to claim 1, characterized in that: In step S2, material removal processing is performed only on the first pre-coating layer (101) on the back face (5) of the cutting part (3) to form the first coating layer (11).

4. The method for preparing a cemented carbide cutting tool with an incompletely covered core coating according to claim 1, characterized in that: In step S2, material removal processing is performed only on the first pre-coating layer (101) on the secondary back face (6) of the cutting part (3) to form the first coating layer (11).

5. The method for preparing a cemented carbide cutting tool with an incompletely covered core coating according to claim 2, characterized in that: In step S2, material removal is performed only on the inner rake face (41) on the rake face (4) to form the first coating (11).

6. The method for preparing a cemented carbide cutting tool with an incompletely covered core coating according to claim 2, characterized in that: In step S2, material removal is performed only on the outer rake face (42) of the rake face (4) to form the first coating (11).

7. The method for preparing a cemented carbide cutting tool with an incompletely covered core according to any one of claims 1 to 6, characterized in that: Following step S3, the following steps are also included: S4. Perform material removal processing on the first coating (11) and the second coating (12) on the inner rake face (41) and / or the outer rake face (42) and / or the flank face (5) and / or the secondary flank face (6) to form an area on the first coating (11) and the second coating (12) that does not completely cover the core of the carbide tool. S5. The carbide tool (1) to be coated is sent into the physical coating furnace as a whole to prepare a second coating (12) that completely covers the cutting part (3) of the carbide tool (1) to be coated.

8. The method for preparing a cemented carbide cutting tool with an incompletely covered core coating according to any one of claims 1 to 6, characterized in that: Before step S3, the cutting edge of the cemented carbide tool (1) to be coated after the first coating (11) is subjected to jet treatment, using corundum particles with a particle size of 120-150 mesh, and the jet time is 1-3 minutes.

9. The method for preparing a cemented carbide cutting tool with an incompletely covered core coating according to claim 8, characterized in that: After step S3, the cutting edge of the cemented carbide tool (1) to be coated after the second coating (12) is subjected to jet treatment, using corundum particles with a particle size of 120-150 mesh, and the jet time is 1-3 minutes.

10. The method for preparing a cemented carbide cutting tool with an incompletely covered core coating according to claim 9, characterized in that: The first coating (11) is an Al2O3 and / or Ti(C,N) coating.

11. The method for preparing a cemented carbide cutting tool with an incompletely covered core coating according to claim 10, characterized in that: The second coating (12) is a (Ti, Al)N and / or (Ti, Cr)N and / or (Ti, Si)N and / or (Ti, Zr)N coating.

12. The method for preparing a cemented carbide cutting tool with an incompletely covered core coating according to claim 10, characterized in that: The second coating (12) is a (Ti, Al, Cr)N and / or (Ti, Al, Zr)N and / or (Ti, Al, Si)N and / or (Ti, Al, Y)N coating.

13. The method for preparing a cemented carbide cutting tool with an incompletely covered core coating according to claim 9, characterized in that: The first coating (11) is a (Ti, Al)N and / or (Ti, Cr)N and / or (Ti, Si)N and / or (Ti, Zr)N coating.

14. The method for preparing a cemented carbide cutting tool with an incompletely covered core coating according to claim 13, characterized in that: The second coating (12) is a (Ti, Al)N and / or (Ti, Cr)N and / or (Ti, Si)N and / or (Ti, Zr)N coating.

15. A method for preparing a cutting insert with a partially coated core, the cutting insert being plate-shaped and comprising a lower support portion (21) and an upper cutting portion (3), the cutting portion (3) comprising a rake face (4), a flank face (5), and a cutting edge formed by the intersection of the rake face (4) and the flank face (5), characterized in that, A method for preparing a cutting blade with a partially covered coating in the core includes the following steps: S1: After placing the cutting blade to be coated, send it into a chemical coating furnace or a physical coating furnace to prepare a first pre-coating (101) that completely covers the cutting part (3) of the cutting blade to be coated. S2: Perform material removal processing on at least one area of ​​the first pre-coating (101) of the rake face (4) and / or flank face (5) of the cutting part (3) to form a first coating (11) that does not completely cover the cutting part (3). S3: The cutting insert to be coated is fed into a physical coating furnace to prepare a second coating (12) that completely covers the cutting part (3) of the cutting insert to be coated.

16. The method for preparing a cutting blade with a partially covered coating in the core according to claim 15, characterized in that: The rake face (4) includes a main rake face (401) and a secondary rake face (402), and the flank face (5) includes a main flank face (51) and a secondary flank face (6). The main rake face (401) intersects with the main flank face (51) to form a main cutting edge (7), and the secondary rake face (402) intersects with the secondary flank face (6) to form a secondary cutting edge (8). In step S2, the first pre-coating layer (101) of at least one area of ​​the main rake face (401) and / or the secondary rake face (402) and / or the main flank face (51) and / or the secondary flank face (6) is subjected to material removal processing to form a first coating layer (11) that does not completely cover the cutting part (3).

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