A multi-bladed round nose end mill

Abstract

This invention provides a multi-flute round nose end mill, which includes a cutter head, multiple first cutting edges, multiple second cutting edges, and multiple third cutting edges. The multiple first cutting edges, multiple second cutting edges, and multiple third cutting edges are evenly spirally wound around the cutter head. The ends of the first cutting edges, the ends of the second cutting edges, and the ends of the third cutting edges are staggered. By evenly and staggeredly setting multiple cutting edges on the cutter head, the wear of each cutting edge is reduced while ensuring smooth chip removal.

Description

Technical Field

[0001] This invention relates to the field of machining tools, and more particularly to a multi-bladed round nose end mill. Background Technology

[0002] A milling cutter is a rotating cutting tool with one or more cutting teeth used for milling operations. During operation, each cutting tooth cuts off the excess material from the workpiece intermittently. To facilitate chip removal, existing milling cutters reduce the number of cutting edges, but this leads to greater wear on the cutting edges and reduces their service life. Existing milling cutters try to distribute the wear pressure by adding more cutting edges, but this reduces the chip relief grooves between the cutting edges, resulting in poor chip removal and even affecting milling efficiency. Summary of the Invention

[0003] The main objective of this invention is to reduce the wear of each cutting edge while ensuring smooth chip removal by adding multiple cutting edges in a staggered, layered manner on a single cutting shaft.

[0004] The present invention provides a multi-flute round nose end mill including a cutter head, the multi-flute round nose end mill further including a plurality of first cutting edges, a plurality of second cutting edges and a plurality of third cutting edges, the plurality of first cutting edges, the plurality of second cutting edges and the plurality of third cutting edges being evenly spirally wound around the cutter head, and the ends of the first cutting edges, the ends of the second cutting edges and the ends of the third cutting edges being staggered from each other.

[0005] Furthermore, the second cutting edge is disposed between the two first cutting edges, and the plurality of third cutting edges are respectively disposed between the first cutting edge and the second cutting edge and between the two second cutting edges.

[0006] Furthermore, the first cutting edge, the second cutting edge, and the third cutting edge all include a front cutting face, a first rear cutting face, and a second rear cutting face, and the angle range of the front cutting face and the angle range of the second rear cutting face of the first cutting edge, the second cutting edge, and the third cutting edge are the same.

[0007] Furthermore, the angle of the front face is in the range of 0° to 5°, and the angle of the second back face is in the range of 25° to 35°.

[0008] Furthermore, the first rear face angle of the first cutting edge ranges from 15° to 18°, the first rear face angle of the second cutting edge ranges from 9° to 11°, and the first rear face angle of the third cutting edge ranges from 3° to 7°.

[0009] Furthermore, the width of the first rear face of the first blade is in the same range as that of the second and third blades, the width of the second rear face of the first blade is in the same range as that of the second and third blades, and the width of the front face of the first blade is in the same range as that of the second and third blades.

[0010] The blade width of the first rear face of the first blade ranges from 0.03mm to 0.08mm, the blade width of the second rear face of the first blade ranges from 0.15mm to 0.2mm, and the width of the front face of the first blade ranges from 0.1mm to 0.2mm.

[0011] Furthermore, the angles at which the first blade, the second blade, and the third blade spiral around the blade head all range from 15° to 35°.

[0012] Furthermore, the multi-bladed round nose end mill is made of cemented carbide.

[0013] Furthermore, the cemented carbide includes tungsten steel.

[0014] The beneficial effects of the present invention are as follows: The multi-flute round nose end mill includes a cutter head, multiple first cutting edges, multiple second cutting edges, and multiple third cutting edges. The multiple first cutting edges, multiple second cutting edges, and multiple third cutting edges are evenly spirally wrapped around the cutter head. The ends of the first cutting edges, the ends of the second cutting edges, and the ends of the third cutting edges are staggered. By having multiple cutting edges evenly and staggeredly arranged on the cutter head, the wear degree of each cutting edge is reduced while ensuring smooth chip removal. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0016] Figure 2 for Figure 1 Enlarged view of part A in the middle;

[0017] Figure 3 This is a top view of an embodiment of the present invention;

[0018] Figure 4 This is a schematic cross-sectional view of the blade head in an embodiment of the present invention.

[0019] The numbers in the diagram are: 100 blade head, 200 first cutting edge, 300 second cutting edge, 400 third cutting edge, 500 front cutting face, 600 first back cutting face, and 700 second back cutting face. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] See appendix Figure 1-4 The present invention provides a multi-flute round nose end mill including a head 100. The multi-flute round nose end mill has a plurality of first cutting edges 200, a plurality of second cutting edges 300 and a plurality of third cutting edges 400. The plurality of first cutting edges 200, a plurality of second cutting edges 300 and a plurality of third cutting edges 400 are evenly spirally wound around the head 100. The ends of the first cutting edges 200, the ends of the second cutting edges 300 and the ends of the third cutting edges 400 are staggered. The spiral angle of the first cutting edges 200, the second cutting edges 300 and the third cutting edges 400 around the head 100 is in the range of 15° to 35°.

[0022] The second cutting edge 300 is disposed between the two first cutting edges 200, and multiple third cutting edges 400 are disposed between the first cutting edges 200 and the second cutting edges 300, and between the two second cutting edges 300, respectively.

[0023] See appendix Figure 2 and attached Figure 3In an embodiment of the present invention, two sets of first cutting edges 200, six sets of second cutting edges 300, and eight sets of third cutting edges 400 are provided. The two sets of first cutting edges 200 are symmetrically arranged on the head 100, with their adjacent ends joined at the center of the head 100. This divides the cutter axis of the multi-flute round nose end mill into two regions by the two sets of first cutting edges 200. The six sets of second cutting edges 300 are divided into two parts, each with three sets, symmetrically arranged in the two divided regions. The end of the second cutting edge 300 at the round nose end of the end mill is a distance away from the center of the head 100, creating a staggered structure between the end of the second cutting edge 300 and the end of the first cutting edge 200. This staggered space facilitates milling... During operation, chips and debris are discharged. The arrangement of the eight sets of third cutting edges 400 is the same as that of the second cutting edges 300. The ends of the third cutting edges 400 are also staggered from the ends of the second cutting edges 300. The position of the third cutting edge 400 after the stagger is farther from the position of the first cutting edge 200 than that of the second cutting edge 300. This makes the staggered structure of the first cutting edge 200, the second cutting edge 300 and the third cutting edge 400 form a stepped shape. The lower cutting edge will share part of the cutting work with the upper cutting edge to reduce the wear of the cutting edge and extend the service life of the cutting edge. Furthermore, the multi-flute round nose end mill is made of cemented carbide, including tungsten carbide. The hardness of the tungsten carbide end mill is second only to diamond, so it is not easily worn and has good heat resistance and corrosion resistance.

[0024] Furthermore, the first cutting edge 200, the second cutting edge 300, and the third cutting edge 400 all include a front cutting face 500, a first rear cutting face 600, and a second rear cutting face 700. The angle range of the front cutting face 500 and the angle range of the second rear cutting face 700 of the first cutting edge 200, the second cutting edge 300, and the third cutting edge 400 are the same.

[0025] The value range of the 500° angle on the front face is 0° to 5°, and the value range of the 700° angle on the second back face is 25° to 35°.

[0026] The first flank face 600 of the first cutting edge 200 has an angle ranging from 15° to 18°, the first flank face 600 of the second cutting edge 300 has an angle ranging from 9° to 11°, and the first flank face 600 of the third cutting edge 400 has an angle ranging from 3° to 7°.

[0027] The width of the first rear face of the first cutting edge is in the same range as that of the second and third cutting edges. The width of the second rear face of the first cutting edge is in the same range as that of the second and third cutting edges. The width of the front face of the first cutting edge is in the same range as that of the second and third cutting edges.

[0028] The width of the first flank face of the first cutting edge ranges from 0.03mm to 0.08mm, the width of the second flank face of the first cutting edge ranges from 0.15mm to 0.2mm, and the width of the front face of the first cutting edge ranges from 0.1mm to 0.2mm.

[0029] Specifically, the three cutting edges also have the same range of values ​​for the width of the rake face, the width of the first clearance face, and the width of the second clearance face. Therefore, the difference between the three cutting edges lies in the different angles of their first clearance angles. This difference in angles results in different cutting forces. As mentioned above, the cutting ability of the first, second, and third cutting edges decreases progressively, but the number of cutting edges increases progressively. This allows the cutting ability of the lower-level cutting edges to be compensated for by the increased number of cutting edges, achieving a good cutting effect while reducing the degree of cutting edge wear and effectively extending the service life of the cutting edges. Furthermore, because the dimensions of the first, second, and third cutting edges are different, the milling cutter can ensure a sufficient number of cutting edges while also having good chip removal space, preventing the chip grooves of the milling cutter from being blocked by chips during the cutting process, thus affecting the cutting efficiency.

[0030] The above description is merely an embodiment of the present invention. It should be noted that those skilled in the art can make improvements without departing from the inventive concept, but these improvements all fall within the protection scope of the present invention.

Claims

1. A multi-flute round nose end mill, comprising a cutter head, characterized in that, It also includes multiple first blades, multiple second blades and multiple third blades, with the multiple first blades, multiple second blades and multiple third blades being evenly spirally wrapped around the head of the blade, and the ends of the first blades, the ends of the second blades and the ends of the third blades being staggered from each other; The first cutting edge, the second cutting edge, and the third cutting edge all include a front cutting face, a first rear cutting face, and a second rear cutting face. The angle range of the front cutting face and the angle range of the second rear cutting face of the first cutting edge, the second cutting edge, and the third cutting edge are the same. The first flank angle of the first cutting edge ranges from 15° to 18°, the first flank angle of the second cutting edge ranges from 9° to 11°, and the first flank angle of the third cutting edge ranges from 3° to 7°.

2. The multi-flute round nose end mill according to claim 1, characterized in that, The second cutting edge is disposed between the two first cutting edges, and the plurality of third cutting edges are respectively disposed between the first cutting edge and the second cutting edge and between the two second cutting edges.

3. The multi-flute round nose end mill according to claim 1, characterized in that, The angle of the front face is in the range of 0° to 5°, and the angle of the second back face is in the range of 25° to 35°.

4. The multi-flute round nose end mill according to claim 1, characterized in that, The width of the first rear face of the first blade is in the same range as that of the second and third blades; the width of the second rear face of the first blade is in the same range as that of the second and third blades; and the width of the front face of the first blade is in the same range as that of the second and third blades. The blade width of the first rear face of the first blade ranges from 0.03 mm to 0.08 mm, the blade width of the second rear face of the first blade ranges from 0.15 mm to 0.2 mm, and the width of the front face of the first blade ranges from 0.1 mm to 0.2 mm.

5. A multi-flute round nose end mill according to claim 1, characterized in that, The angles at which the first, second, and third cutting edges spiral around the blade head range from 15° to 35°.

6. A multi-flute round nose end mill according to claim 1, characterized in that, The multi-blade round nose end mill is made of cemented carbide.

7. A multi-flute round nose end mill according to claim 6, characterized in that, The cemented carbide includes tungsten steel.

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