Hard alloy milling cutter for PCB (printed circuit board) processing

Abstract

The utility model discloses a hard alloy milling cutter for processing a PCB (Printed Circuit Board), which comprises a shaft-shaped milling cutter body, the milling cutter body is provided with a cutter head part and a cutter handle part which are integrally formed, the cutter head part is provided with four cutting blades which are arranged at equal angles along the circumferential direction, and the end face of each cutting blade comprises a first blade face and a second blade face. A first edge angle is formed between the first edge surface and the horizontal end surface of the cutting edge; and the first blade surface is coated with a TiAlN coating. The first blade face and the second blade face are arranged on the end face of the cutting blade, the first blade face is located on the edge of the cutting blade, the angle of the first blade face is small, resistance in the initial stage of cutting is small, and the cutting blade can cut into PCB materials more smoothly. The first blade face is coated with the TiAlN coating, the TiAlN coating can effectively improve the abrasion resistance of the surface of the first blade face and reduce abrasion in the cutting process, the low friction coefficient of the TiAlN coating is low, the cutting resistance can be reduced, and therefore cutting is smoother.

Description

Technical Field

[0001] The utility model relates to the field of cemented carbide milling cutters, in particular to a cemented carbide milling cutter for PCB board processing. Background Art

[0002] A cemented carbide milling cutter is a milling cutter made of cemented carbide material, which is widely used in the cutting processing of various materials, especially in the processing of high-hardness materials.

[0003] In the prior art, during the processing of PCB boards, the milling operation faces many challenges and disadvantages. Since PCB boards are usually made of glass fiber-reinforced epoxy resin composites, they have the characteristics of high hardness and brittleness. The cutting resistance of traditional milling cutters is relatively large, resulting in rapid wear of traditional milling cutters during processing, short tool life, and low cutting efficiency, which affects the processing accuracy of products. Secondly, a large amount of chips will be generated during high-speed cutting. If they cannot be discharged in time and effectively, chip jams will occur, affecting processing efficiency and surface quality. In addition, a certain amount of heat will also be generated during cutting. If heat cannot be dissipated in time, it is easy to cause the tool to overheat and deform, exacerbating tool wear and even damaging the workpiece surface.

[0004] Therefore, there are defects in the prior art and improvement is needed. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a cemented carbide milling cutter for PCB board processing with small cutting resistance, effectively improving cutting efficiency and not easy to wear.

[0006] To achieve this purpose, the utility model adopts the following technical solutions: A cemented carbide milling cutter for PCB board processing, including a milling cutter body in a shaft shape, the milling cutter body has an integrally formed cutter head part and a cutter handle part;

[0007] Four cutting edges are arranged at equal angles along the circumferential direction of the cutter head part, and the four cutting edges are spirally extended from the cutter head part to the cutter handle part;

[0008] A chip removal groove is formed between two adjacent cutting edges;

[0009] The end face of the cutting edge includes a first cutting edge face and a second cutting edge face. The first cutting edge face is located at the edge of the cutting edge. A first cutting edge angle is formed between the first cutting edge face and the horizontal end face of the cutting edge. A second cutting edge angle is formed between the second cutting edge face and the horizontal end face of the cutting edge. The angle of the first cutting edge angle is smaller than that of the second cutting edge angle;

[0010] The cross-sectional area of the first cutting edge face is smaller than that of the second cutting edge face;

[0011] The first cutting edge surface is coated with a TiAlN coating.

[0012] Adopting the above technical solution, in the cemented carbide milling cutter for PCB board processing, the angle of the first cutting edge angle is 10 - 25°, and the angle of the second cutting edge angle is 25 - 40°.

[0013] Adopting each of the above technical solutions, in the cemented carbide milling cutter for PCB board processing, a horizontal plane is provided in the middle of the cutter head;

[0014] The height between the edge of the first cutting edge surface and the horizontal plane is 0.4 - 1.4 mm.

[0015] Adopting each of the above technical solutions, in the cemented carbide milling cutter for PCB board processing, it further includes a locking collar, a locking nut, and a tool holder seat;

[0016] The locking collar is sleeved on the tool shank portion, a cylindrical cavity is provided inside the tool holder seat, and the tool shank portion is located inside the cylindrical cavity;

[0017] A stepped groove for limiting and abutting against the locking collar is provided inside the locking nut, and the locking nut is threadedly connected to the outer wall of the tool holder seat;

[0018] The locking nut is used to apply a pressure to the locking collar that closely fits the tool shank portion when threadedly connected to the tool holder seat.

[0019] Adopting each of the above technical solutions, in the cemented carbide milling cutter for PCB board processing, the locking collar is made of spring steel material.

[0020] Adopting each of the above technical solutions, in the cemented carbide milling cutter for PCB board processing, the thickness of the TiAlN coating is 1 - 6 μm.

[0021] Adopting each of the above technical solutions, in the cemented carbide milling cutter for PCB board processing, the cutter body is made of tungsten carbide cemented carbide material.

[0022] Compared with the prior art, the present utility model has the following beneficial effects:

[0023] The utility model is provided with four cutting edges arranged at equal angles along the circumferential direction of the tool head. The four cutting edges arranged at equal angles can evenly distribute the cutting force, making the force received by the tool head more balanced during the machining process, thereby reducing vibration and offset, and improving the machining stability and precision. A first cutting surface and a second cutting surface are arranged on the end surface of the cutting edge. The first cutting surface is located at the edge of the cutting edge and has a small angle, so that the resistance at the initial stage of cutting is small, thereby reducing the generation of friction and heat. Moreover, the smaller first cutting angle can cut into the PCB board material more smoothly, reduce the instantaneous cutting force, and reduce the wear of the milling cutter. The first cutting surface is coated with a TiAlN coating. The TiAlN coating has a high hardness, which can effectively improve the wear resistance of the surface of the first cutting surface, thereby reducing the wear of the tool head during the cutting process. In addition, the low friction coefficient of the TiAlN coating is low, which can reduce the frictional force during the cutting process and reduce the cutting resistance, thereby making the cutting more smooth. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] The structures, proportions, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those who are familiar with this technology to understand and read, and are not used to limit the conditions under which the present utility model can be implemented. Therefore, they do not have technical substance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present utility model.

[0026] Figure 1 is an exploded structural schematic diagram of the present utility model;

[0027] Figure 2 is an overall structural schematic diagram of the present utility model;

[0028] Figure 3 is a structural schematic diagram of the milling cutter body of the present utility model;

[0029] Figure 4 is a front structural schematic diagram of the milling cutter body of the present utility model;

[0030] Figure 5 is Figure 4 a partial enlarged structural schematic diagram of area A in Detailed Embodiments

[0031] In order to make the utility model purpose, features, and advantages of the present utility model more obvious and understandable, the following will combine the drawings in the embodiments of the present utility model to clearly and completely describe the technical solutions in the embodiments of the present utility model. Obviously, the embodiments described below are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present utility model.

[0032] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be an intermediate component.

[0033] The following will further illustrate the technical solutions of the present utility model with reference to the drawings and through specific embodiments.

[0034] As Figures 1 to 5 shown, the embodiment of the present utility model provides a cemented carbide milling cutter for PCB board processing, including a milling cutter body 1 in a shaft shape. The milling cutter body 1 has an integrally formed cutter head portion 11 and a tool shank portion 12. The cutter head portion 11 is provided with four equally angled cutting edges 100 along the circumferential direction. The four cutting edges 100 are spirally extended from the cutter head portion 11 towards the tool shank portion 12, and a chip discharge groove 110 is formed between adjacent two of the cutting edges 100; the four equally angled cutting edges 100 can evenly distribute the cutting force, so that during the processing, the force received by the cutter head portion 11 is more balanced, reducing vibration and deviation, and improving the stability and accuracy of the processing; the spirally extended cutting edges 100 can more effectively discharge the chips along the direction of the chip discharge groove 110 during the cutting process, preventing the chips from accumulating in the cutting area, keeping the cutting area clean, and ensuring the continuity of the processing.

[0035] As Figures 3 to 5As shown, the end face of the cutting edge 100 includes a first cutting face 101 and a second cutting face 102. The first cutting face 101 is located at the edge of the cutting edge 100. A first cutting angle α1 is formed between the first cutting face 101 and the horizontal end face of the cutting edge 100. A second cutting angle α2 is formed between the second cutting face 102 and the horizontal end face of the cutting edge 100. The angle of the first cutting angle α1 is less than that of the second cutting angle α2. The cross-sectional area of the first cutting face 101 is less than that of the second cutting face 102. The first cutting face 101 is coated with a TiAlN coating. The first cutting face 101 is located at the edge of the cutting edge 100 and has a smaller angle, resulting in less resistance at the initial stage of cutting, reducing friction and heat generation. Moreover, the smaller first cutting angle α1 can cut into the PCB board material more smoothly, reducing the instantaneous cutting force and cutter wear. The smaller cross-sectional area of the first cutting face 101 can perform fine cutting, improving the cutting accuracy and surface finish of the product. The larger cross-sectional area of the second cutting face 102 can provide stronger support and wear resistance to bear most of the cutting load, protecting the first cutting face 101 from excessive stress and wear, thereby extending the service life of the milling cutter. The TiAlN coating has a high hardness, which can effectively improve the wear resistance of the surface of the first cutting face 101, thereby reducing the wear of the tool head 11 during the cutting process. In addition, the low friction coefficient of the TiAlN coating is relatively low, which can reduce the friction force during the cutting process and the cutting resistance, making the cutting smoother.

[0036] Further, the angle of the first cutting angle α1 is 10 - 25°, and the angle of the second cutting angle α2 is 25 - 40°. In this embodiment, the angle of the first cutting angle α1 is 15°, and the angle of the second cutting angle α2 is 30°.

[0037] As Figure 3 shown, further, a horizontal plane 103 is provided in the middle of the tool head 11. The height between the cutting edge of the first cutting face 101 and the horizontal plane 103 is 0.4 - 1.4 mm. In this embodiment, the height between the cutting edge of the first cutting face 101 and the horizontal plane 103 is 1 mm, that is, the cutting depth of the tool head 11 is 1 mm. Such a setting can improve the force uniformity during the cutting process, reduce tool vibration and deviation, and improve the machining accuracy.

[0038] As Figure 1 and Figure 2As shown in the figure, further, it further includes a locking clamp 21, a locking nut 22 and a tool holder clamp 23. The locking clamp 21 is sleeved on the tool shank portion 12. The tool holder clamp 23 is internally provided with a cylindrical chamber 230. The tool shank portion 12 is located in the cylindrical chamber 230. The locking nut 22 is internally provided with a stepped groove 220 that is limited and abutted against the locking clamp 21. And the locking nut 22 is threadedly connected to the outer wall of the tool holder clamp 23. The locking nut 22 is used to apply a pressure that closely fits the tool shank portion 12 to the locking clamp 21 when threadedly connected to the tool holder clamp 23. The locking clamp 21 and the locking nut 22 can provide a reliable clamping and fixing force for the tool shank portion 12 to firmly fix the tool shank portion 12 on the tool holder clamp 23, prevent the tool shank portion 12 from loosening or shifting during the machining process, thereby improving the stability and accuracy of the cutting process and reducing errors.

[0039] Further, the locking clamp 21 is made of spring steel material. Spring steel has excellent elasticity and resilience, enabling the locking clamp 21 to quickly return to its original shape after being deformed by an external force, thereby providing a continuous and stable clamping force with high fixing stability. Even under high load or vibration conditions, the milling cutter can still maintain a close fit.

[0040] Further, the thickness of the TiAlN coating is 1 - 6 μm. In this embodiment, the thickness of the TiAlN coating is 2 μm.

[0041] Further, the cutter body 1 is made of tungsten carbide material. Tungsten carbide has high hardness and wear resistance, which can effectively reduce wear during the cutting process, thereby extending the service life of the milling cutter and improving the cutting efficiency.

[0042] In the present utility model, four cutting edges 100 are provided at equal angles along the circumferential direction of the cutter head portion 11. The four cutting edges 100 provided at equal angles can evenly distribute the cutting force, making the force received by the cutter head portion 11 during the machining process more balanced, thereby reducing vibration and offset and improving the machining stability and accuracy; a first cutting edge surface 101 and a second cutting edge surface 102 are provided on the end surface of the cutting edge 100. The first cutting edge surface 101 is located at the edge of the cutting edge 100 and has a small angle, making the resistance at the initial stage of cutting small, thereby reducing friction and heat generation. Moreover, the small first cutting edge angle α1 can cut into the PCB board material more smoothly, reducing the instantaneous cutting force and cutter wear; the first cutting edge surface 101 is coated with a TiAlN coating. The TiAlN coating has high hardness, which can effectively improve the wear resistance of the surface of the first cutting edge surface 101, thereby reducing the wear of the cutter head portion 11 during the cutting process. And the low friction coefficient of the TiAlN coating is low, which can reduce the frictional force during the cutting process and the cutting resistance, thereby making the cutting smoother.

[0043] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cemented carbide milling cutter for PCB board processing, characterized in that, It includes a milling cutter body in the shape of a shaft, and the milling cutter body has an integrally formed cutter head portion and a tool shank portion; The cutter head portion is provided with four cutting edges arranged at equal angles in the circumferential direction, and the four cutting edges are spirally extended from the cutter head portion towards the tool shank portion; A chip removal groove is formed between two adjacent cutting edges; The end face of the cutting edge includes a first cutting face and a second cutting face. The first cutting face is located at the edge of the cutting edge. A first cutting edge angle is formed between the first cutting face and the horizontal end face of the cutting edge. A second cutting edge angle is formed between the second cutting face and the horizontal end face of the cutting edge. The angle of the first cutting edge angle is less than that of the second cutting edge angle; The cross-sectional area of the first cutting face is smaller than that of the second cutting face; The first cutting face is coated with a TiAlN coating.

2. The carbide milling cutter for PCB board processing according to claim 1, characterized in that, The angle of the first cutting edge angle is 10 - 25°, and the angle of the second cutting edge angle is 25 - 40°; 3. The cemented carbide milling cutter for PCB board processing according to claim 1, wherein, A horizontal plane is provided in the middle of the cutter head portion; The height between the edge of the cutting edge of the first cutting face and the horizontal plane is 0.4 - 1.4 mm; 4. The carbide milling cutter for PCB board processing according to claim 1, wherein, It further includes a locking clamp, a locking nut, and a tool shank holder; The locking clamp is sleeved on the tool shank portion. A cylindrical cavity is provided inside the tool shank holder, and the tool shank portion is located inside the cylindrical cavity; A stepped groove for limiting and abutting against the locking clamp is provided inside the locking nut, and the locking nut is threadedly connected to the outer wall of the tool shank holder; The locking nut is used to apply a pressure to the locking clamp to closely fit with the tool shank portion when threadedly connected to the tool shank holder; 5. The cemented carbide milling cutter for PCB board processing according to claim 4, characterized in that, The locking clamp is made of spring steel; 6. The carbide milling cutter for PCB board processing according to claim 1, wherein, The thickness of the TiAlN coating is 1 - 6 μm; 7. The cemented carbide milling cutter for PCB board processing according to claim 1, wherein, The milling cutter body is made of tungsten carbide.

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