Multi-edge ball-end milling cutter

Abstract

The multi-edge ball-end milling cutter comprises a cutter handle, a cutting part, a first cutting edge and a second cutting edge, the first cutting edge is arranged along the arc of the cutting part and passes through the top end of the cutting part, and the two ends of the first cutting edge are arranged at the joint of the cutting part and the cutter handle correspondingly; the second cutting edge is circumferentially arranged around the axis of the cutter handle, one end of the second cutting edge is arranged close to the joint of the cutting part and the cutter handle, and a gap is reserved between the other end of the second cutting edge and the end part of the cutting part. The first cutting edge is arranged at the top end of the cutting part, the second cutting edge is only arranged around the cutting part, and the gap is formed between the second cutting edge and the top end of the cutting part, so that the number of cutting edges located at the top end of the cutting part and used for cutting is reduced, the size of the chip removal groove is not prone to being reduced, the chip removal process is more convenient, and the chip removal efficiency is improved. And the influence of cuttings on the machining precision is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of milling cutters, and in particular to a multi-edge ball-end milling cutter. Background Art

[0002] Ball end mills are widely used in the processing of key parts in the aerospace, automotive, shipbuilding and other industries. At the same time, these key parts are mainly made of difficult-to-process materials such as titanium alloys, high-temperature alloys and high-strength steels with high strength, low density and high thermal hardness. When processing difficult-to-process materials, the wear of the cutting edge of the milling cutter will be aggravated. Therefore, in order to increase the processing life of the milling cutter, the method of increasing the number of cutting edges is usually adopted to increase the service life of the tool.

[0003] However, as the number of cutting edges increases, the size of the chip grooves between adjacent cutting edges will decrease, affecting the discharge of chips. When the chips accumulate in the chip grooves, it is difficult to ensure the machining accuracy of the workpiece.

[0004] Therefore, it is necessary to propose a new technical solution to solve the above problems. Utility Model Content

[0005] In order to make it easier to discharge chips and reduce the impact of chips on machining accuracy, the present application provides a multi-edge ball end milling cutter.

[0006] The present application provides a multi-edge ball end milling cutter, which adopts the following technical solution:

[0007] A multi-blade ball-end milling cutter comprises a shank, a cutting portion in the form of a ball end arranged at the end of the shank, a plurality of first cutting edges arranged on the cutting portion, and a plurality of second cutting edges arranged on the cutting portion, wherein the first cutting edge is arranged along the arc of the cutting portion and passes through the top end of the cutting portion, the two ends of the first cutting edge are respectively arranged at the connection between the cutting portion and the shank, the second cutting edge is circumferentially arranged around the axis of the shank, one end of the second cutting edge is arranged close to the connection between the cutting portion and the shank, a gap is left between the other end of the second cutting edge and the end of the cutting portion, a chip groove is arranged between adjacent second cutting edges, a chip groove is also arranged on both sides of the first cutting edge, and the chip grooves between the first cutting edge and the second cutting edge overlap.

[0008] By adopting the above technical solution, by setting the first cutting edge at the top of the cutting part, and the second cutting edge only around the cutting part and a gap between the second cutting edge and the top of the cutting part, the number of cutting edges located at the top of the cutting part for cutting is reduced, and the size of the chip groove is not easy to reduce, thereby making the chip removal process more convenient and reducing the influence of chips on machining accuracy.

[0009] Optionally: the first cutting edge includes two first parts, the first parts are arranged on both sides of the axis of the tool handle, the middle part of the first part is offset toward the cutting direction of the milling cutter, and the two first parts are axially symmetrically arranged around the axis of the tool handle.

[0010] By adopting the above technical solution, when the cutting edge rotates and performs milling, the chips can move along the chip groove in a direction away from the axis of the cutting portion, so that the chips can be discharged more easily along the chip groove.

[0011] Optionally: one end of the second cutting edge close to the end of the cutting portion is offset toward the cutting direction of the milling cutter.

[0012] By adopting the above technical solution, when the second cutting edge mills the workpiece, the generated chips can also enter the chip groove and move along the chip groove toward the tool holder, so that the chips are not easy to directly contact the machined surface when they are separated, so that the machining accuracy is not easily affected.

[0013] Optionally: the offset amplitude of the first cutting edge is equal to the offset amplitude of the first cutting edge, and the contour extension line of the second cutting edge itself passes through the top of the cutting portion.

[0014] By adopting the above technical solution, when the first cutting edge and the second cutting edge are located in the part of the cutting portion away from its own axis, the workpiece can always maintain contact with the first cutting edge or the second cutting edge, so that the first cutting edge or the second cutting edge will not directly impact the workpiece during milling, so that the processing process of the workpiece is not easily affected.

[0015] Optionally: a clearance groove is provided at one end of the cutting portion away from the shank, and the clearance grooves are respectively provided on both sides of the first cutting edge, and the clearance grooves are connected to the chip removal grooves located on both sides of the first cutting edge.

[0016] By adopting the above technical solution, the space between the top of the cutting part and the workpiece is further increased, so that the chips can move toward the chip groove in the clearance groove and be discharged from the chip groove, making it difficult for the chips to affect the surface accuracy of the workpiece.

[0017] Optionally: the evacuation groove is arranged in a hemispherical shape, the axis of the evacuation groove coincides with the axis of the tool handle, and a gap is left between the evacuation groove and the end of the second cutting edge close to the cutting part.

[0018] By adopting the above technical solution, the connection strength between the second cutting edge and the cutting part is not easily affected. At the same time, during the cutting process, the end of the second cutting edge away from the handle will be continuously subjected to force, so that the second cutting edge can be stably fixed on the cutting part.

[0019] Optionally: the portion of the first cutting edge close to the top of the cutting portion is arranged perpendicular to the axis of the cutting portion, and the distance between the horizontal position of the first cutting edge and the handle is greater than the distance between the end of the second cutting edge away from the handle and the handle.

[0020] By adopting the above technical solution, during the milling process, the second cutting edge first mills the workpiece, and then the first cutting edge mills the workpiece. The feed depth of the second cutting edge is greater than the feed depth of the first cutting edge, thereby reducing the pressure on the first cutting edge, making the first cutting edge less likely to be damaged, and also using the first cutting edge to perform fine processing on the workpiece.

[0021] Optionally, the spacing between adjacent second cutting edges gradually increases as they move away from the end of the cutting portion.

[0022] By adopting the above technical solution, the width of the chip groove is increased, so that the chips in the chip groove are more easily discharged along the chip groove, thereby reducing the influence of the chips on the machining accuracy of the workpiece.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. By increasing the feed depth of the second cutting edge and reducing the feed depth of the first cutting edge, the pressure on the first cutting edge is reduced, making the first cutting edge less prone to wear. At the same time, the first cutting edge can be finely processed after the second cutting edge is processed;

[0025] 2. As the distance from the top of the cutting part gradually increases, the width of the chip groove gradually increases, making it easier for the chips to be discharged along the chip groove, so that the chips are less likely to affect the high precision of the workpiece processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of an embodiment of the present application;

[0027] Figure 2 for Figure 1 Enlarged view of part A.

[0028] In the figure, 1, tool handle; 2, first cutting edge; 21, first part; 3, second cutting edge; 4, cutting part; 41, clearance groove; 5, chip removal groove. DETAILED DESCRIPTION

[0029] The present application is further described in detail below in conjunction with the accompanying drawings.

[0030] The present application discloses a multi-edge ball end milling cutter, such as Figure 1 and Figure 2As shown, it includes a handle 1, a cutting portion 4 with a ball head at the end of the handle 1, a plurality of first cutting edges 2 arranged on the cutting portion 4, and a plurality of second cutting edges 3 arranged on the handle 1. The axis of the cutting portion 4 coincides with the axis of the handle 1, the end of the cutting portion 4 away from the handle 1 is arranged in a ball head, and the diameter of the end of the cutting portion 4 close to the handle 1 is the same as the diameter of the handle 1. The first cutting edge 2 is arranged along the arc of the cutting portion 4, and the first cutting edge 2 passes through the top of the cutting portion 4 away from the handle 1, and the two ends of the first cutting edge 2 are respectively arranged at the connection between the cutting portion 4 and the cutting edge. The second cutting edge 3 is arranged around the axis of the cutting portion 4, one end of the second cutting edge 3 is arranged at the connection between the cutting portion 4 and the handle 1, and the other end of the second cutting edge 3 is arranged close to the end of the cutting portion 4 away from the handle 1, and a gap is left between the second cutting edge 3 and the end of the cutting portion 4 away from the handle 1. The cutting portion 4 is provided with chip grooves 5 on both sides of the first cutting edge 2, and the chip grooves 5 are also provided between the adjacent second cutting edges 3 on the chip portion, and the chip grooves 5 between the first cutting edge 2 and the second cutting edge 3 overlap. During the cutting process, the workpiece is first processed by the second cutting edge 3 from the side, and then the first cutting edge 2 is used for auxiliary processing. Only one first cutting edge 2 is provided at the end of the cutting portion 4, so that the space for chip removal is larger and the influence of chips on milling is reduced.

[0031] The first cutting edge 2 includes two first parts 21, which are respectively arranged on both sides of the axis of the cutting part 4, and the two first parts 21 are symmetrically arranged around the axis of the cutting part 4. One end of the first part 21 is arranged at the end of the cutting part 4 away from the handle 1, the middle part of the first part 21 is offset toward the rotation direction of the milling cutter, and the end of the first part 21 close to the handle 1 is offset away from the rotation direction of the milling cutter. Therefore, during the cutting process, the chips can move along the chip discharge groove 5 toward the handle 1, making the discharge of the chips more convenient.

[0032] The offset direction of the second cutting edge 3 is the same as that of the portion where the first cutting edge 2 is arranged, so that the virtual extension line of the profile of the second cutting wheel can pass through the top of the cutting portion 4, so that the spacing between adjacent second cutting edges 3 gradually increases as the second cutting edge 3 approaches the tool holder 1. The end of the second cutting edge 3 close to the top of the cutting portion 4 is inclined toward the direction of rotation of the milling cutter, and the end of the second cutting edge 3 close to the tool holder 1 is inclined away from the direction of rotation of the milling cutter, so that the chip groove 5 arranged between adjacent second cutting edges 3 and the chip groove 5 arranged between the first cutting edge 2 and the second cutting edge 3 have the same direction, and the width of the cutting edge gradually increases as it moves away from the top of the cutting portion 4, so that the cuttings are easier to be discharged from the chip groove 5.

[0033] The distance between the tip of the end of the second cutting edge 3 away from the handle 1 and the handle 1 is greater than the distance between the top of the cutting portion 4 and the handle 1, so that during the cutting process, the second cutting edge 3 first cuts the workpiece, so that the top of the second cutting portion 4 does not directly contact the workpiece. The top of the cutting portion 4 is also coaxially provided with a clearance groove 41, which is hemispherical and respectively arranged on both sides of the second cutting edge 3, and the clearance groove 41 is connected to the chip groove 5. The clearance groove 41 can also accommodate part of the chips and allow the chips to enter the chip groove 5 for discharge, thereby reducing the impact of the chips on the processing.

[0034] The portion of the first cutting edge 2 close to the top of the cutting portion 4 is arranged perpendicular to the axis of the cutting portion 4, and the horizontal position of the first cutting edge 2 is farther away from the tool handle 1 than the tip of the end of the second cutting edge 3 away from the tool handle 1. Therefore, during the machining process, the second cutting edge 3 first performs a certain milling on the workpiece, and then the first cutting edge 2 performs a deeper milling on the workpiece. During the machining process, the machining feed amount of the second cutting edge 3 is larger, while the feed amount of the first cutting edge 2 is smaller. Therefore, when only one first cutting edge 2 is provided, the wear of the cutting edge is reduced, and the first cutting edge 2 is also used for a finishing process.

[0035] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A multi-edge ball end milling cutter, characterized in that: The invention comprises a shank (1), a cutting portion (4) in the form of a ball head arranged at the end of the shank (1), a plurality of first cutting edges (2) arranged on the cutting portion (4), and a plurality of second cutting edges (3) arranged on the cutting portion (4), wherein the first cutting edge (2) is arranged along the arc of the cutting portion (4) and passes through the top of the cutting portion (4), the two ends of the first cutting edge (2) are respectively arranged at the connection between the cutting portion (4) and the shank (1), the second cutting edge (3) is arranged circumferentially around the axis of the shank (1), one end of the second cutting edge (3) is arranged close to the connection between the cutting portion (4) and the shank (1), a gap is left between the other end of the second cutting edge (3) and the end of the cutting portion (4), a chip removal groove (5) is arranged between adjacent second cutting edges (3), chip removal grooves (5) are also arranged on both sides of the first cutting edge (2), and the chip removal grooves (5) between the first cutting edge (2) and the second cutting edge (3) overlap.

2. A multi-edge ball end milling cutter according to claim 1, characterized in that: The first cutting edge (2) comprises two first parts (21), the first parts (21) are arranged on both sides of the axis of the tool handle (1), the middle part of the first part (21) is offset towards the cutting direction of the milling cutter, and the two first parts (21) are axially symmetrically arranged around the axis of the tool handle (1).

3. A multi-edge ball end milling cutter according to claim 2, characterized in that: One end of the second cutting edge (3) close to the end of the cutting portion (4) is offset toward the cutting direction of the milling cutter.

4. A multi-edge ball end milling cutter according to claim 3, characterized in that: The offset amplitude of the first cutting edge (2) is equal to the offset amplitude of the first cutting edge (2), and the contour extension line of the second cutting edge (3) passes through the top end of the cutting portion (4).

5. The multi-edge ball end milling cutter according to claim 1, characterized in that: A clearance groove (41) is provided at one end of the cutting portion (4) away from the shank (1), and the clearance grooves (41) are respectively provided on both sides of the first cutting edge (2), and the clearance grooves (41) are connected to the chip removal grooves (5) located on both sides of the first cutting edge (2).

6. A multi-edge ball end milling cutter according to claim 5, characterized in that: The clearance groove (41) is arranged in a hemispherical shape, the axis of the clearance groove (41) coincides with the axis of the shank (1), and a gap is left between the clearance groove (41) and the end of the second cutting edge (3) close to the cutting part (4).

7. The multi-edge ball end milling cutter according to claim 1, characterized in that: The portion of the first cutting edge (2) close to the top of the cutting portion (4) is arranged perpendicular to the axis of the cutting portion (4), and the distance between the first cutting edge (2) in a horizontal position and the handle (1) is greater than the distance between the end of the second cutting edge (3) away from the handle (1) and the handle (1).

8. The multi-edge ball end milling cutter according to claim 1, characterized in that: The distance between adjacent second cutting edges (3) gradually increases as they move away from the end of the cutting portion (4).

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