End mill

Abstract

The invention discloses an end mill, and belongs to the technical field of end mills. The end mill comprises a clamping part and a cutting part fixedly connected with one end of the clamping part, two bottom-edge long blade parts are arranged in one group of bottom-edge long blade parts, and parts of the two bottom-edge long blade parts are uniformly distributed in the central area of the bottom of the cutting part. And parts of the two long edge parts of the bottom edge are fixedly connected at the central area of the bottom of the cutting part, so that a group of long edge parts of the bottom edge are connected and pass through the central area of the cutting part, the undesirable phenomenon of serious chip blockage of the bottom edge in the fast-feed efficient machining process of the end mill is effectively avoided, the strength of the root part of the bottom edge of the end mill is increased, and the service life of the end mill is prolonged. The undesirable phenomenon that the root center of the end mill bottom blade is broken is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of end mills, and in particular to an end mill. Background Art

[0002] End mills are a common type of milling cutter in the field of mechanical processing. End mills have cutting blades on the cylindrical surface and end face. The cutting edge on the cylindrical surface and the cutting edge on the end face (i.e., the bottom edge) can be used for cutting at the same time or separately. End mills can be used for plane milling, groove milling, step milling, and profile milling.

[0003] However, during the machining process, the end mill is prone to serious chip blockage in the center of the bottom blade. Summary of the invention

[0004] The embodiment of the present application provides an end mill, which can solve the problem of serious chip blockage in the center of the bottom blade in the end mill processing process in the prior art. The technical solution is as follows:

[0005] In one aspect, an end mill is provided, the end mill comprising:

[0006] A clamping portion, and a cutting portion fixedly connected to one end of the clamping portion, wherein the bottom of the cutting portion has: a group of bottom blade long edge portions and at least one group of bottom blade short edge portions;

[0007] A group of the bottom blade long edge portions comprises: two bottom blade long edge portions symmetrically distributed along the central axis of the cutting portion, parts of the two bottom blade long edge portions are distributed in the central area of ​​the bottom of the cutting portion and are fixedly connected at the central area of ​​the bottom of the cutting portion, and the bottom blade long edge portions have bottom blade long edges;

[0008] Each group of the bottom blade short edge portions comprises: two bottom blade short edge portions distributed on both sides of the two bottom blade long edges, and the bottom blade short edge portions have bottom blade short edges.

[0009] Optionally, each of the bottom blade long blade portions comprises: a long blade portion body, and a connecting portion fixed to one end of the long blade portion body, the bottom blade long blade comprises: a first blade provided on the long blade portion body and a second blade provided on the connecting portion, the second blade being connected flush with the first blade;

[0010] Wherein, the two connecting portions of the two bottom blade long edge portions are arranged opposite to each other along a target direction and are connected to each other, and the target direction intersects with the extending direction of the bottom blade long edge portion.

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

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

[0013] The bottom blade short edge comprises: a third arc edge and a fourth arc edge connected to each other, the fourth arc edge is used to connect with the circumferential edge of the cutting portion, and the radius of the third arc edge is greater than the radius of the fourth arc edge;

[0014] Wherein, the radius of the first circular arc edge is greater than the radius of the third circular arc edge.

[0015] Optionally, the ratio of the radius of the first circular arc edge to the radius of the third circular arc edge ranges from 1.1 to 1.3.

[0016] Optionally, the center of the first arc edge coincides with the central axis of the cutting portion, and a first horizontal distance exists between the center of the third arc edge and the central axis of the cutting portion;

[0017] Wherein, in the direction along the central axis of the cutting portion, the long edge of the bottom blade is away from the clamping portion relative to the short edge of the bottom blade.

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

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

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

[0021] Optionally, each of the bottom blade long edge portions has a first flank face and a first rake face, and the intersection of the first flank face and the first rake face forms the bottom blade long edge; each of the bottom blade short edge portions has a second flank face and a second rake face, and the intersection of the second flank face and the second rake face forms the bottom blade short edge;

[0022] Among them, the first angle between the first front cutting edge and the base plane in the orthogonal plane ranges from -15 degrees to 10 degrees; the second angle between the second front cutting edge and the base plane in the orthogonal plane ranges from -15 degrees to 10 degrees; the third angle between the first back cutting edge and the cutting plane in the orthogonal plane ranges from 5 degrees to 15 degrees; the fourth angle between the second back cutting edge and the cutting plane in the orthogonal plane ranges from 5 degrees to 15 degrees.

[0023] Optionally, each of the bottom blade long edge portions further comprises a third flank surface located on a side of the first flank surface away from the first rake surface; each of the bottom blade short edge portions further comprises a fourth flank surface located on a side of the second flank surface away from the second rake surface;

[0024] Among them, the fifth angle between the third back tool surface and the cutting plane in the orthogonal plane ranges from 15 degrees to 36 degrees; the sixth angle between the fourth back tool surface and the cutting plane in the orthogonal plane ranges from 15 degrees to 36 degrees.

[0025] The beneficial effects brought by the technical solution provided by the embodiment of the present application include at least:

[0026] A vertical milling cutter may include: a clamping portion, and a cutting portion fixedly connected to one end of the clamping portion, by arranging two bottom blade long edge portions in a group of bottom blade long edge portions, and parts of the two bottom blade long edge portions are distributed in the central area of ​​the bottom of the cutting portion, and parts of the two bottom blade long edge portions are fixedly connected at the central area of ​​the bottom of the cutting portion, so that a group of bottom blade long edge portions are connected through the central area of ​​the cutting portion, so that during the cutting process, the bottom blade long edge portions can cut at the bottom center position of the cutting portion and enhance chip removal, effectively avoiding the undesirable phenomenon of serious chip blockage of the bottom blade during the fast feed and efficient processing of the vertical milling cutter, and increasing the strength of the root of the bottom blade of the vertical milling cutter, avoiding the undesirable phenomenon of the center of the root of the bottom blade of the vertical milling cutter collapsing. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a structural schematic diagram of an end mill provided in an embodiment of the present application;

[0029] Figure 2 is a front view of a cutting portion provided in an embodiment of the present application;

[0030] Figure 3 is a front view of another cutting portion provided in an embodiment of the present application;

[0031] Figure 4 is a top view of a cutting portion provided in an embodiment of the present application;

[0032] Figure 5 is a top view of another cutting portion provided in an embodiment of the present application;

[0033] Figure 6 It is a comparative schematic diagram of a bottom blade with a long edge and a bottom blade with a short edge provided in an embodiment of the present application;

[0034] Figure 7 is a schematic structural diagram of another end mill provided in an embodiment of the present application;

[0035] Figure 8 yes Figure 7 A front view of a cutting portion in an end mill is shown;

[0036] Fig. 9 yes Figure 8 Cross-sectional view at AA'.

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

[0038] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0039] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0040] Please refer to Figure 1 and Figure 2 , Figure 1 is a schematic structural diagram of an end mill provided in an embodiment of the present application, Figure 2 It is a front view of a cutting portion provided in an embodiment of the present application. The end mill 000 may include: a clamping portion 100, and a cutting portion 200 fixedly connected to one end of the clamping portion 100. The bottom of the cutting portion 200 may have: a group of bottom blade long edge portions 201 and at least one group of bottom blade short edge portions 202. For example, in other embodiments, the bottom blade short edge portions 202 may be an even number of groups such as 2 groups, 4 groups or 6 groups, which is not limited in the embodiment of the present application.

[0041] A group of bottom blade long edge portions 201 in the cutting portion 200 may include: two bottom blade long edge portions 201 symmetrically distributed along the central axis L of the cutting portion 200, portions of the two bottom blade long edge portions 201 may be distributed in the central area of ​​the bottom of the cutting portion 200, and portions of the two bottom blade long edge portions 201 may be fixedly connected at the central area of ​​the bottom of the cutting portion 200. Each bottom blade long edge portion 201 may have a bottom blade long edge A1, the extension direction of the bottom blade long edge A1 may be the same as the extension direction of the bottom blade long edge portion 201, and the bottom blade long edge A1 may be used to cut the surface of the workpiece to be processed. Here, the two bottom blade long edge portions 201 in a group of bottom blade long edge portions 201 may be an integral structure.

[0042] Each group of bottom blade short edge portions 202 may include: two bottom blade short edge portions 202 distributed on both sides of two bottom blade long edges A1, each bottom blade short edge portion 202 has a bottom blade short edge A2, the extension direction of the bottom blade short edge A2 may be the same as the extension direction of the bottom blade short edge portion 202, and the bottom blade short edge A2 may be used to cut the surface of the workpiece to be processed. Here, the length of the bottom blade long edge portion 201 is greater than the length of the bottom blade short edge portion 202.

[0043] In the embodiment of the present application, two bottom blade long edge portions 201 are arranged in a group of bottom blade long edge portions 201, and portions of the two bottom blade long edge portions 201 are distributed in the central area of ​​the bottom of the cutting portion 200, and portions of the two bottom blade long edge portions 201 are fixedly connected at the central area of ​​the bottom of the cutting portion 200. In this way, a group of bottom blade long edge portions 201 can be connected through the central area of ​​the bottom of the cutting portion 200, so that during the cutting process, the bottom blade long edge portions can cut at the bottom center position of the cutting portion and enhance chip removal, effectively avoiding the adverse phenomenon of serious chip blockage of the bottom blade during the fast feed and efficient processing of the end mill 000, and increasing the strength of the root of the bottom blade of the end mill 000, avoiding the adverse phenomenon of the center of the root of the bottom blade of the end mill.

[0044] Optional, please refer to Figure 3 , Figure 3It is a front view of another cutting portion provided by an embodiment of the present application. Each bottom blade long edge portion 201 may include: a long edge portion body 201a, and a connecting portion 201b fixed at one end of the long edge portion body 201a, and the bottom blade long edge A1 may include: a first blade A11 arranged on the long edge portion body 201a and a second blade A12 arranged on the connecting portion 201b, and the second blade A12 is connected flush with the first blade A11. Among them, the two connecting portions 201b in the two bottom blade long edge portions 201 can be arranged relatively along the target direction f1 (that is, the two connecting portions 201b have an overlapping area along the target direction f1) and are connected to each other, and the target direction f1 can intersect with the extension direction of the bottom blade long edge portion 201. In this case, by fixing the two bottom blade long edge portions 201 with two connecting portions 201b, the root portion of a set of bottom blade long edge portions 201 has a certain thickness, further improving the strength of the bottom blade root portion of the end mill 000, and making the end mill 000 more reliable; at the same time, the second blade A12 of the connecting portion 201b cuts the bottom center position and enhances the chip removal effect there, avoiding chip clogging at the bottom center position of the end mill 000, further improving the cutting effect and service life of the bottom blade root portion. It should be noted that the connecting portions 201b of the two bottom blade long edge portions 201 are distributed in the central area of ​​the bottom of the cutting portion 200.

[0045] In this application, if Figure 3 As shown, the bottom blade long edge A1 in each bottom blade long edge portion 201 is eccentrically arranged relative to the central axis L of the cutting portion 200, and the ratio between the eccentric distance x of the bottom blade long edge A1 relative to the central axis L of the cutting portion 200 and the diameter Dc of the cutting portion 200 can range from 0.0025 to 0.015. In this way, by eccentrically arranging the bottom blade long edges A1 in two bottom blade long edge portions 201, the central area in a group of bottom blade long edge portions 201 has a certain thickness, so that the strength of the bottom blade root of the end mill 000 is high, and the bottom blade root is not easy to wear during the cutting process of the end mill 000. For example, the ratio between the eccentric distance x of the bottom blade long edge A1 relative to the central axis L of the cutting portion 200 and the diameter Dc of the cutting portion 200 can be 0.0025, 0.003, 0.01 or 0.015, etc.

[0046] It should be noted that the eccentric distances x of the bottom blade long edges A1 in the two bottom blade long edge portions 201 relative to the central axis L of the cutting portion 200 may be the same.

[0047] Optional, please refer to Figure 4 , Figure 5 and Figure 6 , Figure 4 is a top view of a cutting portion provided in an embodiment of the present application, Figure 5is a top view of another cutting portion provided in an embodiment of the present application, Figure 6 It is a comparative schematic diagram of a bottom blade long edge and a bottom blade short edge provided in an embodiment of the present application. Each bottom blade long 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 bottom blade long 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 bottom blade long edge A1 can be greater than the radius R2 of the second arc edge Y2. Each bottom blade short 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 bottom blade short 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 bottom blade short edge A2 can be greater than the radius R4 of the fourth arc edge Y4. Among them, the radius R1 of the first arc edge Y1 in the bottom blade long edge A1 is greater than the radius R3 of the third arc edge Y3 in the bottom blade short edge A2. In this case, by setting the first arc edge Y1 and the second arc edge Y2 connected to each other in the bottom blade long edge A1, the second arc edge Y2 is used to connect with the circumferential edge Z of the cutting part 200, and setting the third arc edge Y3 and the fourth arc edge Y4 connected to each other in the bottom blade short edge A2, the fourth arc edge Y4 is used to connect with the circumferential edge Z of the cutting part 200. In this way, the first arc edge Y1 and the second arc edge Y2 in the bottom blade long edge A1 can form the small main deflection angle Kr required for fast feed face milling, and the third arc edge Y3 and the fourth arc edge Y4 in the bottom blade short edge A2 can also form the small main deflection angle Kr required for fast feed face milling, so that the "thin cutting" fast feed effect of the end mill 000 face milling can be achieved.

[0048] It should be noted that the center of the first arc blade Y1 in the bottom blade long edge A1 does not coincide with the center of the second arc blade Y2, and the first arc blade Y1 is tangent to the second arc blade Y2. The center of the third arc blade Y3 in the bottom blade short edge A2 does not coincide with the center of the fourth arc blade Y4, and the third arc blade Y3 is tangent to the fourth arc blade Y4. It should also be noted that the first arc blade Y1 and the second arc blade Y2 are the bottom blade long edges in the lateral perspective of the cutting portion 200, and the third arc blade Y3 and the fourth arc blade Y4 are the bottom blade short edges in the lateral perspective of the cutting portion 200.

[0049] In the present application, the ratio of the radius R1 of the first circular arc edge Y1 in the bottom blade long edge A1 to the radius R3 of the third circular arc edge Y3 in the bottom blade short edge A2 may be in the range of 1.1 to 1.3. For example, the ratio of the radius R1 of the first circular arc edge Y1 in the bottom blade long edge A1 to the radius R3 of the third circular arc edge Y3 in the bottom blade short edge A2 may be 1.1, 1.2 or 1.3.

[0050] For example, the ratio of the radius R1 of the first circular arc cutting edge Y1 in the bottom blade long edge A1 to the diameter Dc of the cutting portion 200 may be in the range of 1 to 4. For example, the ratio of the radius R1 of the first circular arc cutting edge Y1 in the bottom blade long edge A1 to the diameter Dc of the cutting portion 200 may be 1, 3 or 4. The ratio of the radius R3 of the third circular arc cutting edge Y3 in the bottom blade short edge A2 to the diameter Dc of the cutting portion 200 may be in the range of 1 to 4. For example, the ratio of the radius R3 of the third circular arc cutting edge Y3 in the bottom blade short edge A2 to the diameter Dc of the cutting portion 200 may be 1, 3 or 4.

[0051] In the embodiments of the present application, Figure 1 , Figure 4 and Figure 5 As shown, the center of the first arc edge Y1 in the bottom blade long edge A1 can coincide with the central axis L of the cutting portion 200, and the center of the third arc edge Y3 in the bottom blade short edge A2 can have a first horizontal distance L1 from the central axis L of the cutting portion 200. In the direction along the central axis L of the cutting portion 200, the bottom blade long edge A1 can be away from the clamping portion 100 relative to the bottom blade short edge A2. In this case, by setting the bottom blade long edge A1 of the cutting portion 200 away from the clamping portion 100 relative to the bottom blade short edge A2, that is, there is an axial height difference between the bottom blade long edge A1 and the bottom blade short edge A2, it can be achieved that the wear of different blades in the cutting process occurs in sequence, thereby extending the tool life.

[0052] For example, the ratio of the first horizontal distance L1 between the center of the third arc edge Y3 in the bottom blade short edge A2 and the central axis L of the cutting portion 200 to the diameter Dc of the cutting portion 200 may be in the range of 0.05 to 0.15. For example, the ratio of the first horizontal distance L1 to the diameter Dc of the cutting portion 200 may be 0.05, 0.1 or 0.15.

[0053] In this application, if Figure 4 As shown, the end D1 of the third circular arc edge Y3 away from the fourth circular arc edge Y4 is away from the clamping portion 100 relative to the connecting intersection D2 of the third circular arc edge Y3 and the fourth circular arc edge Y4, and a second horizontal distance L2 may exist between the end D1 of the third circular arc edge Y3 away from the fourth circular arc edge Y4 and the central axis L of the cutting portion 200. For example, as Figure 4 As shown, the angle θ1 between the line connecting the intersection point D2 of the third circular arc edge Y3 and the fourth circular arc edge Y4 and the center of the third circular arc edge Y3 and the line passing through the center of the third circular arc edge Y3 and parallel to the central axis L of the cutting portion 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 blade short 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 circular arc edge Y3 away from the fourth circular arc edge Y4 and the central axis L of the cutting portion 200 to the diameter Dc of the cutting portion 200 may be in the range of 0.1 to 0.2. For example, the ratio of the second horizontal distance L2 to the diameter Dc of the cutting portion 200 may be 0.1, 0.15 or 0.2.

[0055] Optional, such as Figure 6 As shown, the height difference δ between the connecting intersection D3 of the first arc edge Y1 and the second arc edge Y2 in the bottom blade long edge A1 and the connecting intersection D2 of the third arc edge Y3 and the fourth arc edge Y4 in the bottom blade short edge A2 in the direction parallel to the central axis L of the cutting part 200 can be greater than 0 and less than or equal to 0.1 mm. The height difference δ can be the maximum height difference between the bottom blade long edge A1 and the bottom blade short edge A2. In this way, even if there is an axial height difference between the bottom blade long edge A1 and the bottom blade short edge A2, the wear of different blades in the cutting process can be realized in sequence, thereby extending the tool life.

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

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

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

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

[0060] In the embodiments of the present application, Figure 7 As shown, the end mill 000 may also include: a transition portion 300 located between the clamping portion 100 and the cutting portion 200, and the two ends of the transition portion 300 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 integrated 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] To summarize, an embodiment of the present application provides a type of end mill, which may include: a clamping portion 100, and a cutting portion 200 fixedly connected to one end of the clamping portion 100, by arranging two bottom blade long edge portions 201 in a group of bottom blade long edge portions 201, and portions of the two bottom blade long edge portions 201 are distributed in the central area of ​​the bottom of the cutting portion 200, and portions of the two bottom blade long edge portions 201 are fixedly connected at the central area of ​​the bottom of the cutting portion 200, so that a group of bottom blade long edge portions 201 are connected through the central area of ​​the bottom of the cutting portion 200, effectively avoiding the undesirable phenomenon of serious chip blockage at the bottom blade during the fast feed and efficient processing of the end mill 000, and increasing the strength of the root of the bottom blade of the end mill 000, thereby avoiding the undesirable phenomenon of center collapse of the root of the bottom blade of the end mill 000.

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

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

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

Claims

1. An end mill, characterized in that: include: A clamping portion, and a cutting portion fixedly connected to one end of the clamping portion, wherein the bottom of the cutting portion has: a group of bottom blade long edge portions and at least one group of bottom blade short edge portions; A group of the bottom blade long edge portions comprises: two bottom blade long edge portions symmetrically distributed along the central axis of the cutting portion, parts of the two bottom blade long edge portions are distributed in the central area of ​​the bottom of the cutting portion and are fixedly connected at the central area of ​​the bottom of the cutting portion, and the bottom blade long edge portions have bottom blade long edges; Each group of the bottom blade short edge portions comprises: two bottom blade short edge portions distributed on both sides of the two bottom blade long edges, and the bottom blade short edge portions have bottom blade short edges.

2. The end mill according to claim 1, characterized in that: Each of the bottom blade long edge parts comprises: a long edge part body, and a connecting part fixed to one end of the long edge part body, the bottom blade long edge comprises: a first blade provided on the long edge part body and a second blade provided on the connecting part, the second blade being connected flush with the first blade; Wherein, the two connecting portions of the two bottom blade long edge portions are arranged opposite to each other along a target direction and are connected to each other, and the target direction intersects with the extending direction of the bottom blade long edge portion.

3. The end mill according to claim 2, characterized in that: The long edge of the bottom blade is eccentrically arranged relative to the central axis of the cutting portion, and the ratio of the eccentric distance of the long edge of the bottom blade relative to the central axis of the cutting portion to the diameter of the cutting portion is in the range of 0.0025 to 0.

015.

4. The end mill according to claim 1, characterized in that: The bottom blade long edge comprises: a first arc edge and a second arc edge connected to each other, the second arc edge is used to connect with the circumferential edge of the cutting part, and the radius of the first arc edge is greater than the radius of the second arc edge; The bottom blade short edge comprises: a third arc edge and a fourth arc edge connected to each other, the fourth arc edge is used to connect with the circumferential edge of the cutting portion, and the radius of the third arc edge is greater than the radius of the fourth arc edge; Wherein, the radius of the first circular arc edge is greater than the radius of the third circular arc edge.

5. The end mill according to claim 4, characterized in that: The ratio of the radius of the first circular arc edge to the radius of the third circular arc edge is in a range of 1.1 to 1.

3.

6. The end mill according to claim 4, characterized in that: The center of the first circular arc edge coincides with the central axis of the cutting portion, and a first horizontal distance exists between the center of the third circular arc edge and the central axis of the cutting portion; Wherein, in the direction along the central axis of the cutting portion, the long edge of the bottom blade is away from the clamping portion relative to the short edge of the bottom blade.

7. The end mill according to claim 6, characterized in that: The ratio of the first horizontal distance to the diameter of the cutting portion ranges from 0.05 to 0.

15.

8. The end mill according to claim 6, characterized in that: A height difference between a connecting intersection of the first circular arc edge and the second circular arc edge and a connecting intersection of the third circular arc edge and the fourth circular arc edge in a direction parallel to the central axis of the cutting portion is greater than 0 and less than or equal to 0.1 mm; The height difference is the maximum height difference between the long edge of the bottom blade and the short edge of the bottom blade.

9. The end mill according to any one of claims 1 to 8, characterized in that: Each of the bottom blade long edge portions has a first flank face and a first rake face, and the intersection of the first flank face and the first rake face forms the bottom blade long edge; each of the bottom blade short edge portions has a second flank face and a second rake face, and the intersection of the second flank face and the second rake face forms the bottom blade short edge; Among them, the first angle between the first front cutting edge and the base plane in the orthogonal plane ranges from -15 degrees to 10 degrees; the third angle between the first back cutting edge and the cutting plane in the orthogonal plane ranges from 5 degrees to 15 degrees; the second angle between the second front cutting edge and the base plane in the orthogonal plane ranges from -15 degrees to 10 degrees; the fourth angle between the second back cutting edge and the cutting plane in the orthogonal plane ranges from 5 degrees to 15 degrees.

10. The end mill according to claim 9, characterized in that: Each of the bottom blade long edge portions also has a third flank surface located on the side of the first flank surface away from the first rake surface; each of the bottom blade short edge portions also has a fourth flank surface located on the side of the second flank surface away from the second rake surface; Among them, the fifth angle between the third back tool surface and the cutting plane in the orthogonal plane ranges from 15 degrees to 36 degrees; the sixth angle between the fourth back tool surface and the cutting plane in the orthogonal plane ranges from 15 degrees to 36 degrees.

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