End mill

Abstract

The application discloses a ball end mill and belongs to the technical field of ball end mills.The ball end mill comprises a clamping part and a cutting part fixedly connected with one end of the clamping part, two bottom long blade parts are arranged in a group of bottom long blade parts, part of the two bottom long blade parts are distributed in the central region of the bottom of the cutting part, and part of the two bottom long blade parts are fixedly connected at the central region of the bottom of the cutting part. Thus, the central region of the cutting part is connected by the group of bottom long blade parts, the phenomenon of serious chip blocking of the bottom long blade part in the fast feeding and efficient machining process of the ball end mill is effectively avoided, the strength of the bottom root of the ball end mill is increased, and the phenomenon of central collapse of the bottom root of the ball end mill is avoided.

Description

Technical Field

[0001] This application relates to the field of end mill technology, and particularly to an end mill. Background Technology

[0002] End mills are a common type of milling cutter in the machining field. An end mill has cutting edges on its cylindrical surface and end face. The cutting edges on the cylindrical surface and the end face (i.e., the bottom edge) can cut simultaneously or separately. End mills can be used for planar milling, groove milling, step milling, and profile milling.

[0003] However, during machining, end mills are prone to severe chip clogging at the center of the bottom edge. Summary of the Invention

[0004] This application provides an end mill. It solves the problem of severe chip clogging at the center of the bottom cutting edge that is prone to occur during the machining process of existing end mills. The technical solution is as follows:

[0005] On one hand, an end mill is provided, the end mill comprising:

[0006] The clamping part and the cutting part fixedly connected to one end of the clamping part, wherein the bottom of the cutting part has: a set of bottom edge long cutting edges and at least a set of bottom edge short cutting edges;

[0007] A set of bottom edge long cutting portions includes: two bottom edge long cutting portions symmetrically distributed along the central axis of the cutting portion, portions of the two bottom edge long cutting portions are distributed in the central region of the bottom of the cutting portion and are fixedly connected at the central region of the bottom of the cutting portion, and the bottom edge long cutting portion has a bottom edge long cutting edge;

[0008] Each set of bottom edge short blades includes: two bottom edge short blades distributed on both sides of the two bottom edge long blades, and the bottom edge short blades have bottom edge short blades.

[0009] Optionally, each of the bottom edge long blade portions includes: a long blade portion body and a connecting portion fixed to one end of the long blade portion body. The bottom edge long blade includes: a first cutting edge disposed on the long blade portion body and a second cutting edge disposed on the connecting portion, wherein the second cutting edge is flush with and connected to the first cutting edge.

[0010] Among them, the two connecting parts of the two bottom edge long blades are arranged opposite to each other along the target direction and are connected to each other, and the target direction intersects with the extension direction of the bottom edge long blade.

[0011] Optionally, the bottom edge long blade is eccentrically arranged relative to the central axis of the cutting part, and the ratio between the eccentric distance of the bottom edge long blade relative to the central axis of the cutting part and the diameter of the cutting part is in the range of 0.0025 to 0.015.

[0012] Optionally, the bottom cutting edge includes: a first circular arc blade and a second circular arc blade connected to each other, the second circular arc blade being used to connect with the circumferential blade of the cutting part, and the radius of the first circular arc blade being greater than the radius of the second circular arc blade;

[0013] The bottom cutting edge includes: a third circular arc edge and a fourth circular arc edge connected to each other, the fourth circular arc edge being used to connect with the circumferential cutting edge of the cutting part, and the radius of the third circular arc edge being greater than the radius of the fourth circular arc edge;

[0014] The radius of the first circular arc blade is greater than the radius of the third circular arc blade.

[0015] Optionally, the ratio of the radius of the first arc blade to the radius of the third arc blade is in the range of 1.1 to 1.3.

[0016] Optionally, the center of the first arc-shaped cutting edge coincides with the central axis of the cutting part, and the center of the third arc-shaped cutting edge has a first horizontal distance from the central axis of the cutting part;

[0017] In the direction along the central axis of the cutting part, the long bottom cutting edge is farther away from the clamping part relative to the short bottom cutting edge.

[0018] Optionally, the ratio between the first horizontal distance and the diameter of the cutting portion ranges from 0.05 to 0.15.

[0019] Optionally, the height difference between the connection point of the first and second circular arc blades and the connection point of the third and fourth circular arc blades in a direction parallel to the central axis of the cutting part is greater than 0 and less than or equal to 0.1 mm.

[0020] Wherein, the height difference is the maximum height difference between the long blade and the short blade of the bottom edge.

[0021] Optionally, each of the bottom edge long cutting portions has a first flank face and a first rake face, and the bottom edge long cutting portion is formed at the intersection of the first flank face and the first rake face; each of the bottom edge short cutting portions has a second flank face and a second rake face, and the bottom edge short cutting portion is formed at the intersection of the second flank face and the second rake face.

[0022] Wherein, the first included angle between the first rake face and the base plane in the orthogonal plane ranges from -15 degrees to 10 degrees; the second included angle between the second rake face and the base plane in the orthogonal plane ranges from -15 degrees to 10 degrees; the third included angle between the first flank face and the cutting plane in the orthogonal plane ranges from 5 degrees to 15 degrees; and the fourth included angle between the second flank face and the cutting plane in the orthogonal plane ranges from 5 degrees to 15 degrees.

[0023] Optionally, each of the bottom edge long cutting portions also has a third flank face located on the side of the first flank face opposite to the first front face; each of the bottom edge short cutting portions also has a fourth flank face located on the side of the second flank face opposite to the second front face.

[0024] The fifth angle between the third flank face and the cutting plane in the orthogonal plane ranges from 15 degrees to 36 degrees; the sixth angle between the fourth flank face and the cutting plane in the orthogonal plane ranges from 15 degrees to 36 degrees.

[0025] The beneficial effects of the technical solutions provided in this application include at least the following:

[0026] An end mill may include: a clamping part and a cutting part fixedly connected to one end of the clamping part. By providing two bottom edge long cutting parts in a set of bottom edge long cutting parts, and having portions of both bottom edge long cutting parts distributed in the central region of the bottom of the cutting part, and having portions of both bottom edge long cutting parts fixedly connected in the central region of the bottom of the cutting part, the set of bottom edge long cutting parts is connected through the central region of the cutting part. This allows the bottom edge long cutting parts to cut at the center position of the bottom of the cutting part during the cutting process and enhances chip removal. This effectively avoids the serious chip clogging problem at the bottom edge during high-efficiency machining with rapid feed of the end mill, and increases the strength of the bottom edge root of the end mill, preventing the defect of central chipping at the bottom edge root of the end mill. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of an end mill provided in an embodiment of this application;

[0029] Figure 2 This is a front view of a cutting part provided in an embodiment of this application;

[0030] Figure 3 This is a front view of another cutting part provided in an embodiment of this application;

[0031] Figure 4 This is a top view of a cutting part provided in an embodiment of this application;

[0032] Figure 5 This is a top view of another cutting part provided in an embodiment of this application;

[0033] Figure 6 This is a comparative schematic diagram of a long bottom edge and a short bottom edge provided in an embodiment of this application;

[0034] Figure 7 This is a schematic diagram of another end mill provided in the embodiments of this application;

[0035] Figure 8 yes Figure 7 The front view of the cutting section in the end mill shown;

[0036] Figure 9 yes Figure 8 Sectional view at A-A'.

[0037] The components include: end mill 000, clamping part 100, cutting part 200, bottom cutting edge long cutting edge 201, bottom cutting edge short cutting edge 202, bottom cutting edge long cutting edge A1, bottom cutting edge short cutting edge A2, long cutting edge body 201a, connecting part 201b, first cutting edge A11, second cutting edge A12, target direction f1, central axis L, eccentric distance x, diameter Dc of the cutting part, first circular arc cutting edge Y1, second circular arc cutting edge Y2, radius R1 of the first circular arc cutting edge, radius R2 of the second circular arc cutting edge, and third circular arc cutting edge Y3. Fourth circular cutting edge Y4, circumferential cutting edge Z, radius of third circular cutting edge R3, radius of fourth circular cutting edge R4, first horizontal distance L1, second horizontal distance L2, included angle θ1, included angle θ2, height difference δ, second included angle α1, fourth included angle α2, sixth included angle α3, transition section 300, first flank face m1, first rake face m2, second flank face m3, second rake face m4, base plane K1, orthogonal plane K2, cutting plane K3, third flank face m5, fourth flank face m6.

[0038] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0040] Please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of an end mill provided in an embodiment of this application. Figure 2 This is a front view of a cutting section provided in an embodiment of this application. The end mill 000 may include: a clamping portion 100, and a cutting section 200 fixedly connected to one end of the clamping portion 100. The bottom of the cutting section 200 may have: a set of long bottom cutting edges 201 and at least a set of short bottom cutting edges 202. For example, in other embodiments, the short bottom cutting edges 202 may be in even numbers, such as 2, 4, or 6 sets; this embodiment of the application does not limit this.

[0041] A set of bottom-edge long cutting edges 201 in the cutting section 200 may include two bottom-edge long cutting edges 201 symmetrically distributed along the central axis L of the cutting section 200. Parts of both bottom-edge long cutting edges 201 may be located in the central region of the bottom of the cutting section 200, and parts of the two bottom-edge long cutting edges 201 may be fixedly connected at the central region of the bottom of the cutting section 200. Each bottom-edge long cutting edge 201 may have a bottom-edge long cutting edge A1, the extension direction of which may be the same as the extension direction of the bottom-edge long cutting edge 201. The bottom-edge long cutting edge A1 can be used to cut the surface of the workpiece to be machined. Here, the two bottom-edge long cutting edges 201 in a set may be an integral structure.

[0042] Each set of bottom edge short cutting portions 202 may include two bottom edge short cutting portions 202 distributed on both sides of the two bottom edge long cutting portions A1. Each bottom edge short cutting portion 202 has a bottom edge short cutting edge A2, the extension direction of which may be the same as the extension direction of the bottom edge short cutting portion 202. The bottom edge short cutting edge A2 can be used to cut the surface of the workpiece to be machined. Here, the length of the bottom edge long cutting portion 201 is greater than the length of the bottom edge short cutting portion 202.

[0043] In this embodiment, by providing two bottom edge long cutting edges 201 in a set of bottom edge long cutting edges 201, and having portions of both bottom edge long cutting edges 201 distributed in the central region of the bottom of the cutting part 200, and having portions of both bottom edge long cutting edges 201 fixedly connected in the central region of the bottom of the cutting part 200, a set of bottom edge long cutting edges 201 can be connected through the central region of the bottom of the cutting part 200. This allows the bottom edge long cutting edges to cut at the center position of the bottom of the cutting part during the cutting process and enhances chip removal. This effectively avoids the serious chip blockage at the bottom edge during the high-efficiency machining process of the end mill 000 with rapid feed, and increases the strength of the root of the bottom edge of the end mill 000, preventing the defect of the center chipping at the root of the bottom edge of the end mill.

[0044] Optional, please refer to Figure 3 , Figure 3This is a front view of another cutting part provided in an embodiment of this application. Each bottom edge long cutting edge 201 may include: a long cutting edge body 201a, and a connecting part 201b fixed to one end of the long cutting edge body 201a. The bottom edge long cutting edge A1 may include: a first cutting edge A11 disposed on the long cutting edge body 201a and a second cutting edge A12 disposed on the connecting part 201b, the second cutting edge A12 being flush with the first cutting edge A11. The two connecting parts 201b of the two bottom edge long cutting edges 201 may be arranged opposite each other along a target direction f1 (i.e., the two connecting parts 201b have an overlapping area along the target direction f1) and connected to each other, the target direction f1 intersecting the extension direction of the bottom edge long cutting edge 201. In this configuration, by fixing the two bottom edge long cutting sections 201 together with two connecting sections 201b, the root of the set of bottom edge long cutting sections 201 has a certain thickness, further improving the strength of the bottom edge root of the end mill 000 and enhancing the reliability of the end mill 000. Simultaneously, the second cutting edge A12 of the connecting section 201b cuts at the bottom center position and enhances the chip removal effect there, preventing chips from clogging at the bottom center position of the end mill 000, further improving the cutting effect and service life of the bottom edge root. It should be noted that the connecting sections 201b in the two bottom edge long cutting sections 201 are located in the central area of ​​the bottom of the cutting section 200.

[0045] In this application, as Figure 3 As shown, the bottom edge A1 in each bottom edge long cutting section 201 is eccentrically positioned relative to the central axis L of the cutting section 200, and the ratio between the eccentric distance x of the bottom edge long cutting section A1 relative to the central axis L of the cutting section 200 and the diameter Dc of the cutting section 200 can range from 0.0025 to 0.015. By eccentrically positioning the bottom edge long cutting sections A1 in the two bottom edge long cutting sections 201, the central region of a set of bottom edge long cutting sections 201 has a certain thickness, resulting in higher strength at the root of the bottom edge of the end mill 000, making it less prone to wear during the cutting process. For example, the ratio between the eccentric distance x of the bottom edge long cutting section A1 relative to the central axis L of the cutting section 200 and the diameter Dc of the cutting section 200 can be 0.0025, 0.003, 0.01, or 0.015, etc.

[0046] It should be noted that the eccentric distance x of the bottom edge long blade A1 in the two bottom edge long blade sections 201 relative to the central axis L of the cutting section 200 can be the same.

[0047] Optional, please refer to Figure 4 , Figure 5 and Figure 6 , Figure 4 This is a top view of a cutting part provided in an embodiment of this application. Figure 5This is a top view of another cutting part provided in an embodiment of this application. Figure 6 This is a comparative schematic diagram of a long bottom edge and a short bottom edge provided in an embodiment of this application. Each long bottom edge A1 may include: a first arc edge Y1 and a second arc edge Y2 connected to each other, the first arc edge Y1 and the second arc edge Y2 are arranged along the extension direction of the long bottom edge A1, the second arc edge Y2 can be used to connect with the circumferential edge Z of the cutting part 200, and the radius R1 of the first arc edge Y1 in the long bottom edge A1 may be greater than the radius R2 of the second arc edge Y2. Each short bottom edge A2 may include: a third arc edge Y3 and a fourth arc edge Y4 connected to each other, the third arc edge Y3 and the fourth arc edge Y4 are arranged along the extension direction of the short bottom edge A2, the fourth arc edge Y4 can be used to connect with the circumferential edge Z of the cutting part 200, and the radius R3 of the third arc edge Y3 in the short bottom edge A2 may be greater than the radius R4 of the fourth arc edge Y4. In this design, the radius R1 of the first arc-shaped cutting edge Y1 in the long bottom edge A1 is larger than the radius R3 of the third arc-shaped cutting edge Y3 in the short bottom edge A2. In this configuration, by providing interconnected first and second arc-shaped cutting edges Y1 and Y2 in the long bottom edge A1 (the second arc-shaped cutting edge Y2 connecting to the circumferential cutting edge Z of the cutting section 200), and by providing interconnected third and fourth arc-shaped cutting edges Y3 and Y4 in the short bottom edge A2 (the fourth arc-shaped cutting edge Y4 connecting to the circumferential cutting edge Z of the cutting section 200), the first and second arc-shaped cutting edges Y1 and Y2 in the long bottom edge A1 can form the small principal cutting edge angle Kr required for rapid feed face milling, and the third and fourth arc-shaped cutting edges Y3 and Y4 in the short bottom edge A2 can also form the small principal cutting edge angle Kr required for rapid feed face milling, thereby achieving the "thin cutting" rapid feed effect for end mill face milling.

[0048] It should be noted that the centers of the first arc-shaped cutting edge Y1 and the second arc-shaped cutting edge Y2 in the long bottom edge A1 do not coincide, and the first arc-shaped cutting edge Y1 and the second arc-shaped cutting edge Y2 are tangent to each other. Similarly, the centers of the third arc-shaped cutting edge Y3 and the fourth arc-shaped cutting edge Y4 in the short bottom edge A2 do not coincide, and the third arc-shaped cutting edge Y3 and the fourth arc-shaped cutting edge Y4 are tangent to each other. It should also be noted that the first arc-shaped cutting edge Y1 and the second arc-shaped cutting edge Y2 are the long bottom edge cutting edges from the side view of the cutting section 200, while the third arc-shaped cutting edge Y3 and the fourth arc-shaped cutting edge Y4 are the short bottom edge cutting edges from the side view of the cutting section 200.

[0049] In this application, the ratio of the radius R1 of the first arc-shaped cutting edge Y1 in the long bottom edge A1 to the radius R3 of the third arc-shaped cutting edge Y3 in the short bottom edge A2 can range from 1.1 to 1.3. For example, the ratio of the radius R1 of the first arc-shaped cutting edge Y1 in the long bottom edge A1 to the radius R3 of the third arc-shaped cutting edge Y3 in the short bottom edge A2 can be 1.1, 1.2, or 1.3.

[0050] For example, the ratio of the radius R1 of the first arc-shaped cutting edge Y1 in the long bottom edge A1 to the diameter Dc of the cutting part 200 can range from 1 to 4. For instance, the ratio of the radius R1 of the first arc-shaped cutting edge Y1 in the long bottom edge A1 to the diameter Dc of the cutting part 200 can be 1, 3, or 4. Similarly, the ratio of the radius R3 of the third arc-shaped cutting edge Y3 in the short bottom edge A2 to the diameter Dc of the cutting part 200 can range from 1 to 4. For instance, the ratio of the radius R3 of the third arc-shaped cutting edge Y3 in the short bottom edge A2 to the diameter Dc of the cutting part 200 can be 1, 3, or 4.

[0051] In the embodiments of this application, such as Figure 1 , Figure 4 and Figure 5 As shown, the center of the first arc-shaped cutting edge Y1 in the long bottom cutting edge A1 can coincide with the central axis L of the cutting part 200, and the center of the third arc-shaped cutting edge Y3 in the short bottom cutting edge A2 can have a first horizontal distance L1 between it and the central axis L of the cutting part 200. Specifically, in the direction along the central axis L of the cutting part 200, the long bottom cutting edge A1 can be located away from the clamping part 100 relative to the short bottom cutting edge A2. In this case, by setting the long bottom cutting edge A1 of the cutting part 200 to be located away from the clamping part 100 relative to the short bottom cutting edge A2, i.e., there is an axial height difference between the long bottom cutting edge A1 and the short bottom cutting edge A2, the wear of different cutting edges can occur sequentially, thereby extending the tool life.

[0052] For example, the ratio of the first horizontal distance L1 between the center of the third arc-shaped cutting edge Y3 in the bottom cutting edge A2 and the central axis L of the cutting part 200 to the diameter Dc of the cutting part 200 can range from 0.05 to 0.15. For instance, the ratio of the first horizontal distance L1 to the diameter Dc of the cutting part 200 can be 0.05, 0.1, or 0.15.

[0053] In this application, as Figure 4 As shown, the end D1 of the third arc-shaped cutting edge Y3 is away from the fourth arc-shaped cutting edge Y4, and is far from the clamping part 100 relative to the intersection point D2 of the third arc-shaped cutting edge Y3 and the fourth arc-shaped cutting edge Y4. Furthermore, a second horizontal distance L2 may exist between the end D1 of the third arc-shaped cutting edge Y3 away from the fourth arc-shaped cutting edge Y4 and the central axis L of the cutting part 200. For example, as... Figure 4 As shown, the angle θ1 between the line connecting the intersection point D2 of the third circular arc cutting edge Y3 and the fourth circular arc cutting edge Y4 and the center of the third circular arc cutting edge Y3, and the line connecting the line passing through the center of the third circular arc cutting edge Y3 and parallel to the central axis L of the cutting part 200, can range from 5 degrees to 25 degrees. It should be noted that in the actual manufacturing process of the end mill 000, the shape of the bottom cutting edge A2 is controlled by controlling the first horizontal distance L1 and the second horizontal distance L2.

[0054] For example, the ratio of the second horizontal distance L2 between the end of the third arc-shaped cutting edge Y3 away from the fourth arc-shaped cutting edge Y4 and the central axis L of the cutting part 200 to the diameter Dc of the cutting part 200 can range from 0.1 to 0.2. For instance, the ratio of the second horizontal distance L2 to the diameter Dc of the cutting part 200 can be 0.1, 0.15, or 0.2.

[0055] Optional, such as Figure 6 As shown, the height difference δ between the connection point D3 of the first and second circular arc edges Y1 and Y2 in the long bottom cutting edge A1 and the connection point D2 of the third and fourth circular arc edges Y3 and Y4 in the short bottom cutting edge A2, along a direction parallel to the central axis L of the cutting section 200, can be greater than 0 and less than or equal to 0.1 mm. This height difference δ can be the maximum height difference between the long bottom cutting edge A1 and the short bottom cutting edge A2. Thus, even with an axial height difference between the long bottom cutting edge A1 and the short bottom cutting edge A2, wear of different cutting edges can occur sequentially during the cutting process, thereby extending tool life.

[0056] For example, such as Figure 5 and Figure 6 As shown, the angle θ2 between the line connecting the intersection point D3 of the first circular arc blade Y1 and the second circular arc blade Y2 in the bottom edge long blade A1 and the center of the first circular arc blade Y1, and the line connecting the line passing through the center of the first circular arc blade Y1 and parallel to the central axis L of the cutting part 200, can be in the range of 5 degrees to 25 degrees.

[0057] In the embodiments of this application, please refer to Figure 7 , Figure 8 and Figure 9 , Figure 7 This is a schematic diagram of another end mill provided in an embodiment of this application. Figure 8 yes Figure 7 The front view of the cutting section in the end mill is shown. Figure 9 yes Figure 8 A cross-sectional view at A-A'. Each bottom edge long cutting edge 201 may have a first flank face m1 and a first rake face m2, and the intersection of the first flank face m1 and the first rake face m2 of the bottom edge long cutting edge 201 can form a bottom edge long cutting edge A1. Each bottom edge short cutting edge 202 may have a second flank face m3 and a second rake face m4, and the intersection of the second flank face m3 and the second rake face m4 of the bottom edge short cutting edge 202 can form a bottom edge short cutting edge A2. For example, the range of the first angle (not shown in the figure) between the first rake face m2 of the bottom edge long cutting edge 201 and the base plane in the orthogonal plane can be -15 degrees to 10 degrees. The range of the second angle α1 between the second rake face m4 of the bottom edge short cutting edge 202 and the base plane K1 in the orthogonal plane K2 can be -15 degrees to 10 degrees.

[0058] For example, such as Figure 9 As shown, the range of the third angle (not shown in the figure) between the first flank face m1 and the cutting plane in the orthogonal plane of the bottom cutting edge long cutting edge 201 can be from 5 degrees to 15 degrees. The range of the fourth angle α2 between the second flank face m3 and the cutting plane K3 in the orthogonal plane K2 of the bottom cutting edge short cutting edge 202 can be from 5 degrees to 15 degrees.

[0059] Optional, such as Figure 9 As shown, each long bottom edge portion 201 may also have a third flank face m5 located on the side of the first flank face m1 opposite to the first rake face m2, and each short bottom edge portion 202 may also have a fourth flank face m6 located on the side of the second flank face m3 opposite to the second rake face m4. For example, the range of the fifth angle (not shown in the figure) between the third flank face m5 in the long bottom edge portion 201 and the cutting plane in the orthogonal plane can be 15 degrees to 36 degrees. The range of the sixth angle α3 between the fourth flank face m6 in the short bottom edge portion 202 and the cutting plane K3 in the orthogonal plane K2 can be 15 degrees to 36 degrees.

[0060] In the embodiments of this application, such as Figure 7 As shown, the end mill 000 may further include a transition portion 300 located between the clamping portion 100 and the cutting portion 200, the two ends of which may be fixedly connected to the clamping portion 100 and the cutting portion 200, respectively. It should be noted that the clamping portion 100, the transition portion 300, and the cutting portion 200 in the end mill 000 may be an integral structure. For example, the clamping portion 100, the transition portion 300, and the cutting portion 200 in the end mill 000 may be made of one or more materials selected from high-speed steel, cemented carbide, cubic boron nitride, and polycrystalline diamond.

[0061] In summary, the embodiments of this application provide an end mill, which may include: a clamping part 100 and a cutting part 200 fixedly connected to one end of the clamping part 100. By providing two bottom edge long cutting edges 201 in a set of bottom edge long cutting edges 201, and the portions of the two bottom edge long cutting edges 201 are distributed in the central region of the bottom of the cutting part 200, and the portions of the two bottom edge long cutting edges 201 are fixedly connected in the central region of the bottom of the cutting part 200, the set of bottom edge long cutting edges 201 are connected through the central region of the bottom of the cutting part 200, which effectively avoids the bad phenomenon of severe chip clogging at the bottom edge during the high-efficiency machining of the end mill 000 with rapid feed, and increases the strength of the root of the bottom edge of the end mill 000, avoiding the bad phenomenon of central chipping at the root of the bottom edge of the end mill 000.

[0062] It should be noted that the dimensions of layers and regions may be exaggerated in the accompanying drawings for clarity. Furthermore, it is understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element, or there may be intermediate layers. Additionally, it is understood that when an element or layer is referred to as being "below" another element or layer, it can be directly below the other element, or there may be more than one intermediate layer or element. Furthermore, it is also understood that when a layer or element is referred to as being "between" two layers or two elements, it can be the only layer between the two layers or two elements, or there may be more than one intermediate layer or element. Similar reference numerals throughout indicate similar elements.

[0063] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0064] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An end mill, characterized in that, include: The clamping part and the cutting part fixedly connected to one end of the clamping part, wherein the bottom of the cutting part has: a set of bottom edge long cutting edges and at least a set of bottom edge short cutting edges; A set of bottom edge long cutting portions includes: two bottom edge long cutting portions symmetrically distributed along the central axis of the cutting portion, portions of the two bottom edge long cutting portions are distributed in the central region of the bottom of the cutting portion and are fixedly connected at the central region of the bottom of the cutting portion, and the bottom edge long cutting portion has a bottom edge long cutting edge; Each group of the bottom edge short blade portion includes: two bottom edge short blade portions distributed on both sides of the two bottom edge long blade portions, the bottom edge short blade portion having a bottom edge short blade; The bottom cutting edge comprises: a first arc-shaped cutting edge and a second arc-shaped cutting edge connected to each other, the second arc-shaped cutting edge being used to connect with the circumferential cutting edge of the cutting part, and the radius of the first arc-shaped cutting edge being greater than the radius of the second arc-shaped cutting edge; the center of the first arc-shaped cutting edge and the center of the second arc-shaped cutting edge do not coincide, and the first arc-shaped cutting edge and the second arc-shaped cutting edge are tangentially arranged. The bottom cutting edge includes: a third circular arc edge and a fourth circular arc edge connected to each other, the fourth circular arc edge being used to connect with the circumferential cutting edge of the cutting part, and the radius of the third circular arc edge being greater than the radius of the fourth circular arc edge; the center of the third circular arc edge and the center of the fourth circular arc edge do not coincide, and the third circular arc edge and the fourth circular arc edge are tangentially arranged. The radius of the first circular arc blade is greater than the radius of the third circular arc blade.

2. The end mill according to claim 1, characterized in that, Each of the bottom edge long blade portions includes: a long blade portion body, and a connecting portion fixed to one end of the long blade portion body. The bottom edge long blade includes: a first cutting edge disposed on the long blade portion body and a second cutting edge disposed on the connecting portion, wherein the second cutting edge is flush with and connected to the first cutting edge. Among them, the two connecting parts of the two bottom edge long blades are arranged opposite to each other along the target direction and are connected to each other, and the target direction intersects with the extension direction of the bottom edge long blade.

3. The end mill according to claim 2, characterized in that, The bottom cutting edge is eccentrically positioned relative to the central axis of the cutting part, and the ratio between the eccentric distance of the bottom cutting edge relative to the central axis of the cutting part and the diameter of the cutting part ranges from 0.0025 to 0.

015.

4. The end mill according to claim 1, characterized in that, The ratio of the radius of the first circular arc blade to the radius of the third circular arc blade ranges from 1.1 to 1.

3.

5. The end mill according to claim 1, characterized in that, The center of the first arc-shaped cutting edge coincides with the central axis of the cutting part, and the center of the third arc-shaped cutting edge has a first horizontal distance from the central axis of the cutting part; In the direction along the central axis of the cutting part, the long bottom cutting edge is farther away from the clamping part relative to the short bottom cutting edge.

6. The end mill according to claim 5, characterized in that, The ratio between the first horizontal distance and the diameter of the cutting part ranges from 0.05 to 0.

15.

7. The end mill according to claim 5, characterized in that, The height difference between the connection point of the first and second circular arc blades and the connection point of the third and fourth circular arc blades in a direction parallel to the central axis of the cutting part is greater than 0 and less than or equal to 0.1 mm. Wherein, the height difference is the maximum height difference between the long blade and the short blade of the bottom edge.

8. The end mill according to any one of claims 1-7, characterized in that, Each of the bottom edge long cutting portions has a first rear cutting face and a first front cutting face, and the bottom edge long cutting portion is formed at the intersection of the first rear cutting face and the first front cutting face; each of the bottom edge short cutting portions has a second rear cutting face and a second front cutting face, and the bottom edge short cutting portion is formed at the intersection of the second rear cutting face and the second front cutting face. Wherein, the first included angle between the first rake face and the base plane in the orthogonal plane ranges from -15 degrees to 10 degrees; the third included angle between the first flank face and the cutting plane in the orthogonal plane ranges from 5 degrees to 15 degrees; the second included angle between the second rake face and the base plane in the orthogonal plane ranges from -15 degrees to 10 degrees; and the fourth included angle between the second flank face and the cutting plane in the orthogonal plane ranges from 5 degrees to 15 degrees.

9. The end mill according to claim 8, characterized in that, Each of the bottom edge long cutting portions also has a third flank cutting surface located on the side of the first flank cutting surface opposite to the first front cutting surface; each of the bottom edge short cutting portions also has a fourth flank cutting surface located on the side of the second flank cutting surface opposite to the second front cutting surface; The fifth angle between the third flank face and the cutting plane in the orthogonal plane ranges from 15 degrees to 36 degrees; the sixth angle between the fourth flank face and the cutting plane in the orthogonal plane ranges from 15 degrees to 36 degrees.

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