A quick-change ball end mill with tapered positioning

Abstract

This utility model provides a quick-change ball end mill with conical surface positioning, including a tool shank and a ball end mill head mounted on the tool shank. The ball end mill head is provided with an external threaded rod and multiple cutting edges. The multiple cutting edges are combined in a ball-shaped profile and are distributed circumferentially along the central axis of the external threaded rod. The surface where the cutting edges connect with the threaded rod is concave inward to form a concave conical connecting surface. One end of the tool shank is provided with an internal threaded hole, which mates with the external threaded rod. The connecting surface between the internal threaded hole and the outer end of the tool shank protrudes outward to form a convex conical connecting surface, which mates with the concave conical connecting surface. This mating structure improves the connection strength between the ball end mill head and the tool shank. When performing heavy-load transverse cutting, the transverse force is decomposed by the conical surface into a force acting on the external threaded rod and a force acting on the conical surface, avoiding stress concentration and thus reducing the likelihood of tool deflection.

Description

Technical Field

[0001] This utility model relates to the field of machining tool technology, and more specifically, to a quick-change ball end mill with conical surface positioning. Background Technology

[0002] With the increasing demand for complex curved surface parts (such as aircraft wings and engine blocks) in aerospace, automotive manufacturing, and other fields, replaceable-head ball end mills have become key machining tools due to their unique curved cutting edge design and high tool change speed. Conventional replaceable-head ball end mills have a threaded connection between the end mill and the shank, with the connection surface fixed by a flat plane. During transverse milling, especially under heavy loads, the concentrated transverse force and poor rigidity of the flat connection surface easily lead to tool deflection.

[0003] Utility model patent CN213945043U discloses a two-flute ball end mill, including a cutter body and a cutter head. A threaded shaft is provided on the top of the cutter body, and a connecting seat is mounted on the top of the threaded shaft. Fixing bolts are provided on both sides of the bottom of the connecting seat. A ventilation port is provided at the front of the connecting seat, and a connecting seat is provided on the left and right sides of the connecting seat. An air vent is provided at the bottom of the connecting seat. The cutter head is placed at the bottom of the cutter body, and a ball end milling cutting edge is provided at the bottom of the cutter head. The cutter body and the cutter head of this two-flute ball end mill are connected by threads, and the connection surface adopts a planar design, which results in poor rigidity of the cutter head against lateral forces. When performing heavy-duty lateral milling, the cutter head is prone to deflection, resulting in a decrease in machining accuracy. Utility Model Content

[0004] This invention addresses the problem that existing ball end mills with interchangeable cutter heads use planar positioning and fixing for the connection surfaces of the cutter head and the cutter shank, resulting in insufficient rigidity of the cutter head to withstand the forces generated during heavy-duty transverse cutting, ultimately leading to tool deflection and reduced machining accuracy. The invention provides a quick-change ball end mill with conical positioning.

[0005] The technical solution adopted in this utility model is:

[0006] A quick-change ball end mill with conical positioning includes a shank and a ball end mill head mounted on the shank. The ball end mill head is provided with an external threaded rod and multiple cutting edges. The multiple cutting edges are combined in a ball-shaped profile and are distributed circumferentially along the central axis of the external threaded rod. The surface where the cutting edges connect with the threaded rod is concave inward to form a concave conical connecting surface. One end of the shank is provided with an internal threaded hole, which mates with the external threaded rod. The connecting surface between the internal threaded hole and the outer end of the shank protrudes outward to form a convex conical connecting surface, which mates with the concave conical connecting surface.

[0007] Furthermore, the taper angle formed by the concave conical connecting surface and the radial section of the tool holder is 10 to 60°.

[0008] Furthermore, the cutting edge includes a rake face and a flank face, and the connecting surface of the rake face and the flank face forms the cutting edge.

[0009] Furthermore, the flank face includes a first flank face and a second flank face connected to the first flank face.

[0010] Furthermore, the cutting edge has a transverse edge at the spherical apex, which is the connection point of the two cutting edges, and the transverse edge is S-shaped.

[0011] Furthermore, the plurality of cutting edges are distributed circumferentially along the central axis of the external thread rod, and their distribution angles are equal.

[0012] Furthermore, the multiple cutting edges are distributed circumferentially along the central axis of the external thread rod, and their distribution angles are not equal.

[0013] Furthermore, the tool holder is provided with an internal cooling water channel, one end of which is connected to the spindle water outlet, and the other end is provided with an outlet facing the cutting edge.

[0014] Furthermore, the surface of the ball end mill is coated with an anti-wear coating.

[0015] Furthermore, the quick-change ball end cutter head is made of cemented carbide.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] The ball end mill of this invention is threadedly connected to the tool shank, and has an inner concave conical connecting surface on the ball end mill and an outer convex conical connecting surface on the tool shank. The concave and convex conical connecting surfaces form a tapered fit, which improves the connection strength between the ball end mill and the tool shank. When performing heavy-duty transverse cutting, the transverse force is decomposed by the conical surface into a force acting on the external threaded rod and a force acting on the conical surface, avoiding stress concentration and making it less likely for the tool to deflect. Attached Figure Description

[0018] Figure 1 A side view of the ball end mill head structure of a quick-change ball end mill with conical positioning;

[0019] Figure 2 A schematic diagram of the overall structure of a quick-change ball end mill with tapered positioning;

[0020] Figure 3 A schematic diagram of the overall structure of the tool holder for a quick-change ball end mill with conical surface positioning;

[0021] Figure 4 This is a partial schematic diagram of the shank connection end of a quick-change ball end mill with tapered positioning.

[0022] Among them: 1. External threaded rod; 2. Cutting edge; 3. Concave conical connecting surface; 4. Rake face; 5. Second flank face; 6. First flank face; 7. Chisel edge; 8. External convex conical connecting surface; 9. Exit; 10. Internal threaded hole. Detailed Implementation

[0023] To clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application; however, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below. Furthermore, it should be understood in the description of this application that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and 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. In addition, 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 indicated technical features. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified. In this application, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In this application, unless otherwise explicitly specified and limited, "on" or "below" a second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0024] Example 1

[0025] like Figures 1 to 4As shown, this embodiment provides a quick-change ball end mill with conical positioning, including a tool holder and a ball end mill head mounted on the tool holder. The ball end mill head is provided with an external threaded rod 1 and multiple cutting edges 2. The multiple cutting edges 2 are distributed circumferentially around the central axis of the external threaded rod 1, and their distribution angles are equal. Each cutting edge 2 includes a rake face 4 and a flank face. The rake face 4 is helical groove-shaped, guiding the chips after cutting to the contact surface between the cutting edge and the workpiece. The flank face includes a first flank face 6 and a second flank face 5 connected to the first flank face. The connecting surface of the rake face 4 and the flank face forms the cutting edge 2. The multiple cutting edges 2 are combined to form a contour. The tool holder is spherical in shape. The cutting edge 2 has a chisel edge 7 at the apex of the spherical shape. The chisel edge 7 can increase the cutting area of ​​the tool and reduce the blind spot. The chisel edge 7 is the connection point of the two cutting edges. The chisel edge 7 is S-shaped. The cutting edges 2 are distributed circumferentially along the central axis of the external thread rod 1. The surface of the cutting edge 2 that connects with the external thread rod is concave inward to form a concave conical connecting surface 3. One end of the tool holder is provided with an internal threaded hole 10. The internal threaded hole 10 cooperates with the external thread rod 1. The connecting surface of the internal threaded hole 10 and the outer end of the tool holder protrudes outward to form a convex conical connecting surface 8. The convex conical connecting surface 8 cooperates with the concave conical connecting surface 3.

[0026] Specifically, the concave conical connecting surface 3 and the radial section of the tool holder form a taper angle of 10°. The convex conical connecting surface 8 is machined into an convex cone shape that matches the concave conical connecting surface 3. When the ball end mill is fully screwed into the tool holder, the concave conical connecting surface 3 and the convex conical connecting surface 8 are in close contact without gap. When the conical surface fit replaces the conventional planar structure, the connection rigidity between the tool holder and the ball end mill is increased, making the tool as a whole more resistant to transverse cutting forces, thus making it less likely for the tool to deflect.

[0027] Example 2

[0028] like Figures 1 to 4As shown, this embodiment provides a quick-change ball end mill with conical positioning, including a tool shank and a ball end mill head mounted on the tool shank. The ball end mill head is provided with an external threaded rod 1 and multiple cutting edges 2. Each cutting edge 2 includes a rake face 4 and a flank face. The rake face 4 is helical groove-shaped, guiding the chips after cutting to the contact surface between the cutting edge and the workpiece. The flank face includes a first flank face 6 and a second flank face 5 connected to the first flank face. The connection surface between the rake face 4 and the flank face forms the cutting edge 2. The multiple cutting edges 2 are combined in a ball-shaped profile. The cutting edges 2 are located at the top of the ball-shaped profile. A transverse cutting edge 7 is provided at the point, which can increase the cutting area of ​​the tool and reduce the blind spot in machining. The transverse cutting edge 7 is the connection point of two cutting edges. The transverse cutting edge 7 is S-shaped. The cutting edges 2 are distributed circumferentially along the central axis of the external thread rod 1. The surface of the cutting edge 2 that connects with the external thread rod is concave inward to form an inward concave conical connecting surface 3. One end of the tool holder is provided with an internal threaded hole 10, which mates with the external thread rod 1. The connecting surface of the internal threaded hole 10 and the outer end of the tool holder protrudes outward to form an outward convex conical connecting surface 8. The outward convex conical connecting surface 8 mates with the inward concave conical connecting surface 3.

[0029] Specifically, the concave conical connecting surface 3 and the radial section of the tool holder form a taper angle of 15°. The convex conical connecting surface 8 is machined into an convex cone shape that matches the concave conical connecting surface 3. When the ball end mill is fully screwed into the tool holder, the concave conical connecting surface 3 and the convex conical connecting surface 8 are in close contact without gap. When the conical surface fit replaces the conventional planar structure, the connection rigidity between the tool holder and the ball end mill is increased, making the tool as a whole more resistant to transverse cutting forces, thus making it less likely for the tool to deflect.

[0030] Furthermore, the multiple cutting edges are distributed circumferentially along the central axis of the external thread rod, and their distribution angles are not equal. This unequal tooth design can reduce vibration deviation during machining.

[0031] Example 3

[0032] like Figures 1 to 4As shown, this embodiment provides a quick-change ball end mill with conical positioning, including a tool shank and a ball end mill head mounted on the tool shank. The ball end mill head is provided with an external threaded rod 1 and multiple cutting edges 2. Each cutting edge 2 includes a rake face 4 and a flank face. The rake face 4 is helical groove-shaped, guiding the chips after cutting to the contact surface between the cutting edge and the workpiece. The flank face includes a first flank face 6 and a second flank face 5 connected to the first flank face. The connection surface between the rake face 4 and the flank face forms the cutting edge 2. The multiple cutting edges 2 are combined in a ball-shaped profile. The cutting edges 2 are located at the top of the ball-shaped profile. A transverse cutting edge 7 is provided at the point, which can increase the cutting area of ​​the tool and reduce the blind spot in machining. The transverse cutting edge 7 is the connection point of two cutting edges. The transverse cutting edge 7 is S-shaped. The cutting edges 2 are distributed circumferentially along the central axis of the external thread rod 1. The surface of the cutting edge 2 that connects with the external thread rod is concave inward to form an inward concave conical connecting surface 3. One end of the tool holder is provided with an internal threaded hole 10, which mates with the external thread rod 1. The connecting surface of the internal threaded hole 10 and the outer end of the tool holder protrudes outward to form an outward convex conical connecting surface 8. The outward convex conical connecting surface 8 mates with the inward concave conical connecting surface 3.

[0033] Specifically, the concave conical connecting surface 3 and the radial section of the tool holder form a taper angle of 30°. The convex conical connecting surface 8 is machined into an convex cone shape that matches the concave conical connecting surface 3. When the ball end mill is fully screwed into the tool holder, the concave conical connecting surface 3 and the convex conical connecting surface 8 are in close contact without gap. When the conical surface fit replaces the conventional planar structure, the connection rigidity between the tool holder and the ball end mill is increased, making the tool as a whole more resistant to transverse cutting forces, thus making it less likely for the tool to deflect.

[0034] Furthermore, the tool holder is provided with an internal cooling water channel. One end of the internal cooling water channel is connected to the spindle water outlet, and the other end is provided with an outlet 9. The outlet 9 faces the cutting edge 2. During the cutting operation, the cutting edge 2 can be cooled to prevent the tool from wearing out due to temperature accumulation and reducing its life.

[0035] Example 4

[0036] like Figures 1 to 4As shown, this embodiment provides a quick-change ball end mill with conical positioning, including a tool shank and a ball end mill head mounted on the tool shank. The ball end mill head is provided with an external threaded rod 1 and multiple cutting edges 2. Each cutting edge 2 includes a rake face 4 and a flank face. The rake face 4 is helical groove-shaped, guiding the chips after cutting to the contact surface between the cutting edge and the workpiece. The flank face includes a first flank face 6 and a second flank face 5 connected to the first flank face. The connection surface between the rake face 4 and the flank face forms the cutting edge 2. The multiple cutting edges 2 are combined in a ball-shaped profile. The cutting edges 2 are located at the top of the ball-shaped profile. A transverse cutting edge 7 is provided at the point, which can increase the cutting area of ​​the tool and reduce the blind spot in machining. The transverse cutting edge 7 is the connection point of two cutting edges. The transverse cutting edge 7 is S-shaped. The cutting edges 2 are distributed circumferentially along the central axis of the external thread rod 1. The surface of the cutting edge 2 that connects with the external thread rod is concave inward to form an inward concave conical connecting surface 3. One end of the tool holder is provided with an internal threaded hole 10, which mates with the external thread rod 1. The connecting surface of the internal threaded hole 10 and the outer end of the tool holder protrudes outward to form an outward convex conical connecting surface 8. The outward convex conical connecting surface 8 mates with the inward concave conical connecting surface 3.

[0037] Specifically, the concave conical connecting surface 3 and the radial section of the tool holder form a taper angle of 60°. The convex conical connecting surface 8 is machined into a convex cone shape that matches the concave conical connecting surface 3. When the ball end mill is fully screwed into the tool holder, the concave conical connecting surface 3 and the convex conical connecting surface 8 are in close contact without gap. When the conical surface fit replaces the conventional planar structure, the connection rigidity between the tool holder and the ball end mill is increased, making the tool as a whole more resistant to transverse cutting forces, thus making it less likely for the tool to deflect.

[0038] Furthermore, the quick-change ball end mill is made of cemented carbide, and its surface is coated with an anti-wear coating to further improve the overall wear resistance of the tool and extend its overall lifespan.

[0039] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A taper located quick change ball nose end mill characterized by, The tool includes a tool holder and a ball-end cutter head mounted on the tool holder. The ball-end cutter head is provided with an external threaded rod and multiple cutting edges. The multiple cutting edges are combined in a ball-end shape and are distributed circumferentially along the central axis of the external threaded rod. The surface where the cutting edges connect with the threaded rod is concave inward to form a concave conical connecting surface. One end of the tool holder is provided with an internal threaded hole, which mates with the external threaded rod. The connecting surface between the internal threaded hole and the outer end of the tool holder protrudes outward to form a convex conical connecting surface, which mates with the concave conical connecting surface.

2. A taper located quick change ball nose cutter according to claim 1, characterized in that, The taper angle formed by the concave conical connecting surface and the radial section of the tool holder is 10~60°.

3. A quick-change ball end mill with conical surface positioning according to claim 1, characterized in that, The cutting edge includes a rake face and a flank face, and the connecting surface of the rake face and the flank face forms the cutting edge.

4. A quick-change ball end mill with conical surface positioning according to claim 3, characterized in that, The flank face includes a first flank face and a second flank face connected to the first flank face.

5. A quick-change ball end mill with conical surface positioning according to claim 1, characterized in that, The cutting edge has a transverse edge at the spherical apex, which is the connection point of the two cutting edges, and the transverse edge is S-shaped.

6. A quick-change ball end mill with conical surface positioning according to claim 1, characterized in that, The multiple cutting edges are distributed circumferentially along the central axis of the external thread rod, and their distribution angles are equal.

7. A quick-change ball end mill with conical surface positioning according to claim 1, characterized in that, The multiple cutting edges are distributed circumferentially along the central axis of the external thread rod, and their distribution angles are not equal.

8. A quick-change ball end mill with conical surface positioning according to claim 1, characterized in that, The tool holder is equipped with an internal cooling water channel. One end of the internal cooling water channel is connected to the spindle water outlet, and the other end is provided with an outlet facing the cutting edge.

9. A quick-change ball end mill with conical surface positioning according to claim 1, characterized in that, The ball end mill is coated with an anti-wear coating.

10. A quick-change ball end mill with conical surface positioning according to claim 1, characterized in that, The ball end mill is made of cemented carbide.

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