A PCD ball end mill

Abstract

This utility model proposes a PCD ball end mill, comprising: a cutter body, the front end of which is provided with a mounting portion, the mounting portion having a vertical sidewall and a curved bottom wall; and an insert, the insert comprising an unsharpened sidewall, an unsharpened bottom wall, and a sharpened sidewall, the unsharpened sidewall being fixedly connected to the vertical sidewall, the unsharpened bottom wall being connected to the curved bottom wall, the unsharpened sidewall and the sharpened sidewall being disposed opposite to each other, and the sharpened sidewall and the curved bottom wall forming a chip removal groove; when projected along a direction toward the sharpened sidewall, the distance between the chip removal groove and the central axis of the cutter body gradually increases along the first direction; when projected along a direction toward the curved bottom wall, the distance between the chip removal groove and the central axis of the cutter body first increases and then decreases along the first direction. This utility model, by designing the depth of the chip removal groove to be gradually varied, can balance chip removal efficiency and long service life.

Description

Technical Field

[0001] This utility model relates to the field of milling cutter technology, specifically to a PCD ball end mill. Background Technology

[0002] PCD ball end mills are ball end mills made of polycrystalline diamond (PCD). Due to their excellent comprehensive mechanical properties and high cost performance, they are widely used in mold manufacturing, aerospace and precision parts machining.

[0003] However, high-hardness materials have high cutting resistance, which makes the cutting edge of cemented carbide tools prone to abrasive wear, diffusion wear, and oxidation wear, resulting in a significant reduction in tool life.

[0004] Therefore, developing a novel ball end mill structure with high wear resistance and long service life has become a technical challenge that urgently needs to be overcome in this field. Utility Model Content

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a PCD ball end mill, comprising:

[0006] The blade body has a mounting portion at its front end, and the mounting portion has a vertical side wall and a curved bottom wall.

[0007] The blade includes an unsharpened sidewall, an unsharpened bottom wall, and a sharpened sidewall. The unsharpened sidewall is fixedly connected to the vertical sidewall, and the unsharpened bottom wall is connected to the curved bottom wall. The unsharpened sidewall and the sharpened sidewall are arranged opposite to each other, and the sharpened sidewall and the curved bottom wall form a chip groove.

[0008] When projected along the direction toward the sharpened sidewall, the distance between the chip removal groove and the central axis of the tool body gradually increases along the first direction;

[0009] When projected along the direction toward the bottom wall of the curved surface, the distance between the chip removal groove and the central axis of the cutter body first increases and then decreases along the first direction.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: By installing the insert on the mounting part of the cutter body and forming a chip removal groove with the sharpened side wall of the insert and the curved bottom wall of the mounting part, chips are discharged through the chip removal groove during milling operation, preventing chips from entangled on the insert and reducing insert wear. In addition, by limiting the change in distance between the chip removal groove and the central axis of the cutter body, the groove depth of the chip removal groove is designed to be gradual. The gradual groove depth can break the periodic cutting impact and reduce the risk of resonance. Furthermore, the deep groove area of ​​the chip removal groove has a large chip capacity, which is conducive to chip removal and heat dissipation, while the shallow groove area maintains structural rigidity and reduces thermal deformation. Therefore, the PCD ball end mill provided by this utility model can balance chip removal efficiency and long service life.

[0011] Furthermore, the length of the chip removal groove along the first direction is 5-10 mm.

[0012] Furthermore, the blade also includes a connecting sidewall, which is adjacent to the unsharpened sidewall, the unsharpened bottom wall, and the sharpened sidewall;

[0013] The vertical sidewall includes a first sidewall connected to the unsharpened sidewall and a second sidewall not connected to the unsharpened sidewall;

[0014] The connecting sidewall, the curved bottom wall, and the second sidewall form a chip groove.

[0015] Furthermore, the connecting sidewall is perpendicular to both the unsharpened sidewall and the sharpened sidewall.

[0016] Furthermore, the curved bottom wall of the chip groove gradually approaches the outer wall of the blade body along the first direction.

[0017] Furthermore, the front end of the blade body is provided with two mounting portions, which are symmetrically arranged along the central axis;

[0018] The blade includes a first blade and a second blade, which are respectively connected to different mounting parts.

[0019] Furthermore, when the directional projection of the blade sidewall is considered, the first blade is aligned with the central axis, while the second blade is not aligned with the central axis.

[0020] Furthermore, the thickness of the first blade and the second blade is 0.5~2mm.

[0021] Furthermore, the rake angle of the first blade and the second blade is 5°~10°, and the clearance angle of the first blade and the second blade is 8°~15°.

[0022] Furthermore, the blunt radius of the first blade and the second blade is 0.003~0.005μm. Attached Figure Description

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0024] Figure 1 This is a schematic diagram of the structure of the PCD ball end mill provided by this utility model;

[0025] Figure 2 for Figure 1 A schematic diagram of the insert structure of the provided PCD ball end mill;

[0026] Figure 3 for Figure 1 A schematic diagram of the cutter body of the provided PCD ball end mill;

[0027] Figure 4 A projection view of the PCD ball end mill provided by this utility model, projected along the direction toward the cutting edge sidewall;

[0028] Figure 5 A projection view of the PCD ball end mill provided by this utility model along the direction toward the bottom wall of the curved surface;

[0029] Figure 6 for Figure 1 A schematic diagram of the insert of the provided PCD ball end mill at another angle.

[0030] In the diagram: 1. Blade body; 11. Mounting part; 111. Vertical side wall; 112. Curved bottom wall; 2. Blade; 21. Unsharpened side wall; 22. Unsharpened bottom wall; 23. Connecting side wall; 24. Sharpened side wall; 3. Chip removal groove; 4. Chip receiving groove. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0033] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0034] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] like Figure 1-5 As shown, this utility model provides a PCD ball end mill, comprising:

[0036] The blade body 1 has a mounting part 11 at its front end, and the mounting part 11 has a vertical side wall 111 and a curved bottom wall 112.

[0037] The blade 2 includes an unsharpened sidewall 2421, an unsharpened bottom wall 22, and a sharpened sidewall 24. The unsharpened sidewall 2421 is fixedly connected to the vertical sidewall 111, and the unsharpened bottom wall 22 is connected to the curved bottom wall 112. The unsharpened sidewall 2421 and the sharpened sidewall 24 are arranged opposite to each other, and the sharpened sidewall 24 and the curved bottom wall 112 form a chip groove 3.

[0038] When projected along the direction toward the blade sidewall 24, the distance d1 between the chip removal groove 3 and the central axis L1 of the blade body 1 gradually increases along the first direction;

[0039] When projected along the direction toward the curved bottom wall 112, the distance d2 between the chip removal groove 3 and the central axis L1 of the cutter body 1 first increases and then decreases along the first direction.

[0040] In this embodiment, the insert 2 is mounted on the mounting part 11 of the cutter body 1, and the sharpened sidewall 24 of the insert 2 and the curved bottom wall 112 of the mounting part 11 form a chip removal groove 3. This allows chips to be discharged through the chip removal groove 3 during milling, preventing chips from entangled on the insert 2 and reducing wear on the insert 2. In addition, by limiting the change in the distance between the chip removal groove 3 and the central axis of the cutter body 1, the groove depth of the chip removal groove 3 is designed to be gradual. The gradual groove depth can break the periodic cutting impact and reduce the risk of resonance. Furthermore, the deep groove area of ​​the chip removal groove 3 has a large chip capacity, which is conducive to chip removal and heat dissipation, while the shallow groove area maintains structural rigidity and reduces thermal deformation. Therefore, the PCD ball end mill provided in this embodiment can balance chip removal efficiency and long service life.

[0041] Preferably, to further ensure the chip removal capacity of the chip removal groove 3, the length of the chip removal groove 3 along the first direction is 5-10 mm.

[0042] Preferably, to further reduce the wear of debris on the blade edge of the blade 2, the blade 2 further includes a connecting sidewall 23, which is disposed adjacent to the unsharpened sidewall 2421, the unsharpened bottom wall 22 and the sharpened sidewall 24.

[0043] The vertical sidewall 111 includes a first sidewall connected to the unsharpened sidewall 2421 and a second sidewall not connected to the unsharpened sidewall 2421;

[0044] The connecting sidewall 23, the curved bottom wall 112, and the second sidewall form a chip groove 4.

[0045] Specifically, when the cutter body 1 drives the blade 2 to rotate, the chips can fly out horizontally through the chip groove 4, reducing the wear of the chips on the cutting edge of the blade 2 in the horizontal direction, and improving the chip removal capacity and tool life.

[0046] Preferably, the connecting sidewall 23 is perpendicular to both the unsharpened sidewall 2421 and the sharpened sidewall 24.

[0047] Preferably, the curved bottom wall 112 of the chip groove 4 gradually approaches the outer side wall of the blade body 1 along the first direction.

[0048] Preferably, to improve the cutting ability of the tool, the front end of the tool body 1 is provided with two mounting parts 11, and the two mounting parts 11 are symmetrically arranged along the central axis;

[0049] The blade 2 includes a first blade and a second blade, which are respectively connected to different mounting parts 11.

[0050] Preferably, when the directional projection of the sharpened sidewall 24 is made, the first blade is arranged to coincide with the central axis, while the second blade is not arranged to coincide with the central axis.

[0051] Preferably, to ensure the hardness of the blade 2, the thickness of the first blade and the second blade is 0.5~2mm.

[0052] Preferably, to avoid back angle interference, the rake angle of the first blade and the second blade is 5°~10°, and the back angle of the first blade and the second blade is 8°~15°.

[0053] Preferably, the blunt radius of the first blade and the second blade is 0.003~0.005μm.

[0054] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0055] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A PCD ball end mill, characterized in that, include: The blade body has a mounting portion at its front end, and the mounting portion has a vertical side wall and a curved bottom wall. The blade includes an unsharpened sidewall, an unsharpened bottom wall, and a sharpened sidewall. The unsharpened sidewall is fixedly connected to the vertical sidewall, and the unsharpened bottom wall is connected to the curved bottom wall. The unsharpened sidewall and the sharpened sidewall are arranged opposite to each other, and the sharpened sidewall and the curved bottom wall form a chip groove. When projected along the direction toward the sharpened sidewall, the distance between the chip removal groove and the central axis of the tool body gradually increases along the first direction; When projected along the direction toward the bottom wall of the curved surface, the distance between the chip removal groove and the central axis of the cutter body first increases and then decreases along the first direction.

2. The PCD ball end mill according to claim 1, characterized in that, The length of the chip removal groove along the first direction is 5-10 mm.

3. The PCD ball end mill according to claim 1, characterized in that, The blade also includes a connecting sidewall, which is adjacent to the unsharpened sidewall, the unsharpened bottom wall, and the sharpened sidewall. The vertical sidewall includes a first sidewall connected to the unsharpened sidewall and a second sidewall not connected to the unsharpened sidewall; The connecting sidewall, the curved bottom wall, and the second sidewall form a chip groove.

4. The PCD ball end mill according to claim 3, characterized in that, The connecting sidewall is perpendicular to both the unsharpened and sharpened sidewalls.

5. The PCD ball end mill according to claim 3, characterized in that, The curved bottom wall that forms the chip groove gradually approaches the outer wall of the cutter body along the first direction.

6. The PCD ball end mill according to claim 1, characterized in that, The front end of the blade body is provided with two mounting parts, and the two mounting parts are symmetrically arranged along the central axis. The blade includes a first blade and a second blade, which are respectively connected to different mounting parts.

7. The PCD ball end mill according to claim 6, characterized in that, When projected along the direction toward the sharpened sidewall, the first blade is aligned with the central axis, while the second blade is not aligned with the central axis.

8. The PCD ball end mill according to claim 6, characterized in that, The thickness of the first blade and the second blade is 0.5~2mm.

9. The PCD ball end mill according to claim 6, characterized in that, The first blade and the second blade have a rake angle of 5° to 10° and a clearance angle of 8° to 15°.

10. The PCD ball end mill according to claim 6, characterized in that, The blunt radius of the first blade and the second blade is 0.003~0.005μm.

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