A four-blade ball knife

Abstract

This invention proposes a four-flute ball end mill. The bottom of the end mill has four cutting edges: a first cutting edge, a second cutting edge, a third cutting edge, and a fourth cutting edge. The first and third cutting edges are symmetrically arranged, as are the second and fourth cutting edges. These four cutting edges enhance the strength of the ball end mill, reduce vibration, and improve tool life. Furthermore, the first and second cutting edges form a first S-shaped transverse edge, and the third and fourth cutting edges form a second S-shaped transverse edge. These two S-shaped transverse edges are symmetrical, resulting in a sharper S-shaped transverse edge, less vibration during machining, and further improved tool life. In addition, the first, second, third, and fourth cutting edges are all helical, effectively improving machining speed and workpiece surface finish, achieving high-speed cutting.

Description

Technical Field

[0001] This utility model relates to the field of cutting tool technology, specifically to a four-flute ball end mill. Background Technology

[0002] Currently, double-edged ball end mills face significant technical bottlenecks when machining high-hardness, low-thermal-conductivity, and difficult-to-cut materials such as nickel-based alloys, titanium alloys, and high-temperature alloys.

[0003] In related technologies, for materials with poor thermal conductivity and difficult to machine, the industry can usually only use low-speed cutting processes. If the cutting speed is increased, it will cause greater vibration of the tool, the machining quality will deteriorate sharply, the tool will wear out severely, and the tool's service life will be greatly shortened. Utility Model Content

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a four-bladed ball cutter, comprising a handle and a blade head disposed at one end of the handle, wherein the bottom of the blade head is hemispherical and is provided with four cutting edges, namely a first cutting edge, a second cutting edge, a third cutting edge, and a fourth cutting edge. The first cutting edge and the third cutting edge are symmetrically arranged, as are the second cutting edge and the fourth cutting edge. The first cutting edge and the second cutting edge form a first S-shaped transverse edge, and the third cutting edge and the fourth cutting edge form a second S-shaped transverse edge. The first S-shaped transverse edge and the second S-shaped transverse edge are symmetrical to each other, and the first cutting edge, the second cutting edge, the third cutting edge, and the fourth cutting edge are all helical.

[0005] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model provides four cutting edges at the bottom of the cutter head, namely the first cutting edge, the second cutting edge, the third cutting edge, and the fourth cutting edge. The first cutting edge and the third cutting edge are symmetrically arranged, and the second cutting edge and the fourth cutting edge are symmetrically arranged. The four cutting edges enhance the strength of the ball end mill, making the ball end mill less prone to vibration and improving the tool's service life. Furthermore, the first cutting edge and the second cutting edge form a first S-shaped transverse edge, and the third cutting edge and the fourth cutting edge form a second S-shaped transverse edge. The first S-shaped transverse edge and the second S-shaped transverse edge are symmetrical to each other, thus making the S-shaped transverse edge sharper, reducing vibration during machining, and further improving the tool's service life. In addition, the first cutting edge, the second cutting edge, the third cutting edge, and the fourth cutting edge are all helical, which effectively improves the machining speed and the surface finish of the workpiece, realizing high-speed cutting.

[0006] Furthermore, a first chip removal groove is formed between the cutting edges of the blade, and the first chip removal groove is spiral-shaped.

[0007] Furthermore, the side of the cutter head is provided with a circumferential blade connected to the cutting tooth, and the circumferential blade is spiral-shaped.

[0008] Furthermore, the combined length of the serrated edge and the circumferential edge is within 10mm-15mm.

[0009] Furthermore, a second chip removal groove is formed between the circumferential cutting edges, and the second chip removal groove is spiral-shaped.

[0010] Furthermore, the helix angle of the circumferential cutting edge is 30°~45°.

[0011] Furthermore, the first and third cutting edges pass through the line of symmetry at the bottom of the cutter head, and the bilateral offset between the first and third cutting edges is within 0.1 mm.

[0012] Furthermore, the widths of the first and second S-shaped transverse blades are within 0.9 mm to 1 mm.

[0013] Furthermore, the distance between the first S-shaped transverse blade and the second S-shaped transverse blade and the line of symmetry is within 0.2-0.3 mm.

[0014] Furthermore, the first S-shaped transverse blade and the second S-shaped transverse blade have sharp points, which protrude along the direction of the line of symmetry, and the protrusion length of the sharp points is within 0.55mm-0.6mm. Attached Figure Description

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 A side view of the four-bladed ball cutter provided by this utility model; Figure 2 A schematic diagram of the bottom of the four-bladed ball cutter provided by this utility model; Figure 3 for Figure 2 Enlarged diagram of point A in the middle.

[0017] In the diagram: 1. Handle; 2. Cutter head; 21. First cutting edge; 22. Second cutting edge; 23. Third cutting edge; 24. Fourth cutting edge; 25. First S-shaped transverse cutting edge; 26. Second S-shaped transverse cutting edge; 251. Sharp point; 3. First chip removal groove; 4. Circumferential cutting edge; 5. Second chip removal groove. Detailed Implementation

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] like Figure 1-3 As shown, this utility model provides a four-bladed ball cutter, including a handle 1 and a blade head 2 disposed at one end of the handle 1. The bottom of the blade head 2 is hemispherical and has four cutting edges, namely a first cutting edge 21, a second cutting edge 22, a third cutting edge 23, and a fourth cutting edge 24. The first cutting edge 21 and the third cutting edge 23 are symmetrically arranged, as are the second cutting edge 22 and the fourth cutting edge 24. The first cutting edge 21 and the second cutting edge 22 form a first S-shaped transverse blade 25, and the third cutting edge 23 and the fourth cutting edge 24 form a second S-shaped transverse blade 26. The first S-shaped transverse blade 25 and the second S-shaped transverse blade 26 are symmetrical to each other. The first cutting edge 21, the second cutting edge 22, the third cutting edge 23, and the fourth cutting edge 24 are all spiral-shaped.

[0023] In this embodiment, the bottom of the cutter head 2 is provided with four cutting edges, namely the first cutting edge 21, the second cutting edge 22, the third cutting edge 23, and the fourth cutting edge 24. The first cutting edge 21 and the third cutting edge 23 are symmetrically arranged, as are the second cutting edge 22 and the fourth cutting edge 24. The four cutting edges enhance the strength of the ball end mill, making it less prone to vibration and improving the tool's service life. Furthermore, the first cutting edge 21 and the second cutting edge 22 form a first S-shaped transverse edge 25, and the third cutting edge 23 and the fourth cutting edge 24 form a second S-shaped transverse edge 26. The first S-shaped transverse edge 25 and the second S-shaped transverse edge 26 are symmetrical to each other. Thus, the S-shaped transverse edge is sharper, resulting in less vibration during machining and further improving the tool's service life. In addition, the first cutting edge 21, the second cutting edge 22, the third cutting edge 23, and the fourth cutting edge 24 are all helical, which effectively improves the machining speed and the surface finish of the workpiece, achieving high-speed cutting.

[0024] Preferably, refer to Figure 3 To further improve chip removal capability, a first chip removal groove 3 is formed between the cutting edges, and the first chip removal groove 3 is spiral-shaped.

[0025] In one embodiment, the first chip removal groove 3 is specially designed with a widened smooth transition. There are at least two transition planes with an included angle between adjacent cutting edges. The first chip removal groove 3 is formed by the sidewalls of two adjacent cutting edges and the two transition planes to ensure that the shredded chips are discharged smoothly.

[0026] Preferably, refer to Figure 1 To further improve the cutting force on the side of the tool, the side of the tool head 2 is provided with a circumferential cutting edge 4 connected to the cutting edge, and the circumferential cutting edge 4 is helical.

[0027] Preferably, refer to Figure 1 The combined length of the serrated edge and the circumferential edge 4 is within 10mm-15mm. Specifically, Figure 1 S4 in the figure is used to characterize the combined cutting length of the toothed edge and the circumferential edge 4, which is in the range of 10mm-15mm to ensure sufficient cutting ability at a certain length.

[0028] Preferably, refer to Figure 1 To further improve chip removal capability, a second chip removal groove is formed between the circumferential blades 4, and the second chip removal groove is spiral-shaped.

[0029] Preferably, the helix angle of the circumferential cutting edge 4 is 30°~45°. The larger helix angle makes the circumferential cutting edge 4 sharp and facilitates chip removal, thus effectively improving the processing speed and the surface finish of the workpiece, and realizing high-speed cutting.

[0030] Preferably, refer to Figure 3The first cutting edge 21 and the third cutting edge 23 pass through the line of symmetry at the bottom of the cutter head 2, and the bilateral offset of the first cutting edge 21 and the third cutting edge 23 is within 0.1 mm. Wherein, the bilateral offset is... Figure 3 e1 in the formula ensures that the first cutting edge 21 and the third cutting edge 23 still have sufficient cutting ability despite their small size.

[0031] Preferably, refer to Figure 3 The widths of the first S-shaped transverse cutting edge 25 and the second S-shaped transverse cutting edge 26 are within 0.9mm to 1mm. The width is S3-S1+e1, thus ensuring that the first S-shaped transverse cutting edge 25 and the second S-shaped transverse cutting edge 26 possess sufficient cutting capability despite their small size.

[0032] Preferably, refer to Figure 3 The distance between the first S-shaped transverse cutting edge 25 and the second S-shaped transverse cutting edge 26 and the line of symmetry is within 0.2-0.3 mm. Specifically, the distance between the first S-shaped transverse cutting edge 25 and the second S-shaped transverse cutting edge 26 and the line of symmetry is S1-e1 / 2, thereby ensuring that the first S-shaped transverse cutting edge 25 and the second S-shaped transverse cutting edge 26 possess sufficient cutting capability despite their small size.

[0033] Preferably, refer to Figure 3 The first S-shaped transverse cutting edge 25 and the second S-shaped transverse cutting edge have sharp points 251, which protrude along the direction of the line of symmetry, and the protrusion length of the sharp points 251 is within 0.55mm-0.6mm. The protrusion length of the sharp points 251 is S2. Therefore, the first S-shaped transverse cutting edge 25 and the second S-shaped transverse cutting edge 26 maintain sufficient cutting capability despite their small size.

[0034] 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.

[0035] 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 four-bladed ball cutter, characterized in that, The tool includes a handle and a blade head located at one end of the handle. The bottom of the blade head is hemispherical and has four cutting edges, namely a first cutting edge, a second cutting edge, a third cutting edge, and a fourth cutting edge. The first and third cutting edges are symmetrically arranged, as are the second and fourth cutting edges. The first and second cutting edges form a first S-shaped transverse edge, and the third and fourth cutting edges form a second S-shaped transverse edge. The first and second S-shaped transverse edges are symmetrical to each other, and the first, second, third, and fourth cutting edges are all spiral-shaped.

2. A four-bladed ball cutter according to claim 1, characterized in that, A first chip removal groove is formed between any two adjacent cutting edges, and the first chip removal groove is spiral-shaped.

3. A four-bladed ball cutter according to claim 2, characterized in that, The side of the cutter head is provided with a circumferential blade that is connected to the cutting tooth, and the circumferential blade is spiral-shaped.

4. A four-bladed ball cutter according to claim 3, characterized in that, The combined length of the serrated edge and the circumferential edge is within 10mm-15mm.

5. A four-bladed ball cutter according to claim 3, characterized in that, A second chip removal groove is formed between any two adjacent circumferential cutting edges, and the second chip removal groove is spiral-shaped.

6. A four-edged ball cutter according to any one of claims 3-5, characterized in that, The helix angle of the circumferential cutting edge is 30°~45°.

7. A four-bladed ball cutter according to claim 1, characterized in that, The first and third cutting edges pass through the line of symmetry at the bottom of the cutter head, and the bilateral offset between the first and third cutting edges is within 0.1 mm.

8. A four-bladed ball cutter according to claim 7, characterized in that, The widths of the first and second S-shaped transverse blades are within 0.9mm to 1mm.

9. A four-bladed ball cutter according to claim 8, characterized in that, The distance between the first and second S-shaped transverse blades and the line of symmetry is within 0.2-0.3 mm.

10. A four-bladed ball cutter according to claim 7, characterized in that, The first S-shaped transverse blade and the second S-shaped transverse blade have sharp points, which protrude along the direction of the line of symmetry, and the protrusion length of the sharp points is within 0.55mm-0.6mm.

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