Milling cutter

Abstract

The embodiment of the utility model provides a milling cutter which comprises a core part, a circumferential blade and an end blade, and the core part comprises an outer circumferential surface and an end surface which are connected with each other; the circumferential blade is arranged on the outer circumferential surface; the end edges are arranged on the end face and correspond to the circumferential edges one to one, each end edge comprises a first arc edge and a second arc edge, the first arc edges, the second arc edges and the circumferential edges are sequentially connected, the first radius of each first arc edge is 4.8 mm-7.2 mm, and the second radius of each second arc edge is 0.26 mm-0. 39 mm. On one hand, the first arc edge and the second arc edge enable the length of the end edge to be increased, the longer end edge has larger cutting width, so that the cutting force borne by the end edge of unit length under the same feeding amount can be reduced, and the milling cutter can mill high-hardness metal with larger feeding amount, and on the other hand, the cutting width of the end edge is increased, so that the service life of the milling cutter is prolonged. The thickness of cuttings generated by the end edge under the same feeding amount can be reduced, the length of the cuttings can be increased, and heat dissipation in the machining process is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of mechanical manufacturing, and in particular to a milling cutter. Background Technology

[0002] With the development of additive manufacturing technology, more and more metal workpieces are being made by 3D printing. However, metal workpieces made this way often have dimensional deviations, thus requiring milling processes to ensure dimensional accuracy. 3D-printed metal workpieces are very hard; in existing technologies, milling cutters are limited by material strength and heat dissipation efficiency, and cannot withstand large cutting forces. Therefore, they can only mill high-hardness metal workpieces with small feed rates, resulting in low processing efficiency. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a milling cutter that can mill high-hardness metal workpieces with a large feed rate.

[0004] This utility model provides a milling cutter, which includes a core, a peripheral cutting edge, and an end cutting edge. The core includes a connected outer peripheral surface and an end surface. The peripheral cutting edge is disposed on the outer peripheral surface. The end cutting edge is disposed on the end surface and is disposed in a one-to-one correspondence with the peripheral cutting edge. The end cutting edge includes a first arc cutting edge and a second arc cutting edge. The first arc cutting edge and the second arc cutting edge are sequentially connected to the peripheral cutting edge. The first arc cutting edge has a first radius of 4.8mm-7.2mm, and the second arc cutting edge has a second radius of 0.26mm-0.39mm.

[0005] The milling cutter provided in this embodiment of the utility model has at least the following beneficial effects:

[0006] On the one hand, the first and second circular arc cutting edges increase the length of the end cutting edge. The longer end cutting edge has a larger cutting width, which reduces the cutting force per unit length of end cutting edge under the same feed rate. This allows the milling cutter to mill high-hardness metals with a larger feed rate. On the other hand, the increased cutting width of the end cutting edge reduces the thickness and increases the length of the chips generated by the end cutting edge under the same feed rate, which is beneficial for heat dissipation during the machining process.

[0007] In one embodiment of this implementation, the end cutting edge has a rake face, which is an arc-shaped surface. In the axial direction of the core, the rake angles of the first end cutting edge corresponding to each point on the rake face are equal, and the angle range is 3° to 7°.

[0008] In one embodiment of this implementation, the end cutting edge has a first end cutting edge relief face and a second end cutting edge relief face, the angle range of the first end cutting edge relief angle corresponding to the first end cutting edge relief face is 6.4°~9.6°, and the angle range of the second end cutting edge relief angle corresponding to the second end cutting edge relief face is 19.2°~28.8°.

[0009] In one embodiment of this implementation, there are multiple peripheral cutting edges and multiple end cutting edges, which are connected in a one-to-one correspondence. A chip removal groove is formed between two adjacent peripheral cutting edges, and a first chip receiving groove and a second chip receiving groove are formed between two adjacent end cutting edges. The first chip receiving groove, the second chip receiving groove and the chip removal groove are connected in sequence. The tooth back angle corresponding to the first chip receiving groove and the tooth back angle corresponding to the second chip receiving groove are different. Multiple first chip receiving grooves are connected to each other at the center of the end face and form a concave chip receiving cavity.

[0010] In one embodiment of this implementation, both the peripheral blade and the end blade are provided with 6 blades.

[0011] In one embodiment of this implementation, the peripheral blade extends spirally along the axial direction of the peripheral blade, and the spiral angle of the peripheral blade ranges from 30.4° to 45.6°.

[0012] In one embodiment of this implementation, the peripheral cutting edge has a first peripheral cutting edge rake face, and the angle range of the first peripheral cutting edge rake angle corresponding to the first peripheral cutting edge rake face is -9.6° to -14.4°.

[0013] In one embodiment of this implementation, the peripheral cutting edge has a first peripheral cutting edge rear face and a second peripheral cutting edge rear face. The angle range of the first peripheral cutting edge rear angle corresponding to the first peripheral cutting edge rear face is 6.4°~9.6°, and the angle range of the second peripheral cutting edge rear angle corresponding to the second peripheral cutting edge rear face is 19.2°~28.8°.

[0014] In one embodiment of this implementation, the core includes a first core and a second core. The first core is located on the side of the second core near the end face. The first outer peripheral surface of the first core and the second outer peripheral surface of the second core are connected and both are provided with the peripheral blade. The first core diameter of the first core is smaller than the second core diameter of the second core.

[0015] In one embodiment of this implementation, there are multiple peripheral blades and multiple end blades, which are connected in a one-to-one correspondence. The peripheral blade on the first core is defined as the first blade, and the peripheral blade on the second core is defined as the second blade. A first chip removal groove is formed between two adjacent first blades, and a second chip removal groove is formed between two adjacent second blades. The first chip removal groove and the second chip removal groove are connected by a circular arc surface transition.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0018] Figure 1 This is an overall schematic diagram of a milling cutter according to one embodiment of the present invention;

[0019] Figure 2 yes Figure 1 A schematic diagram of the cross-section of a milling cutter;

[0020] Figure 3 yes Figure 1 A schematic diagram of the cross-section of a milling cutter;

[0021] Figure 4 yes Figure 3 An enlarged schematic diagram of a portion of the cross-section structure;

[0022] Figure 5 yes Figure 1 An enlarged schematic diagram of the milling cutter section structure.

[0023] Figure label:

[0024] Milling cutter 100; core 10; first core 11; first outer peripheral surface 111; second core 12; second outer peripheral surface 121; arc surface 13; peripheral cutting edge 20; first cutting edge 21; second cutting edge 22; chip removal groove 23; first chip removal groove 231; second chip removal groove 232; end cutting edge 30; first arc cutting edge 31; second arc cutting edge 32; rake face 33; first chip groove 34; second chip groove 35; chip cavity 36; tool holder 40. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0026] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0028] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0029] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0030] Please see Figure 1 and Figure 5 , Figure 1 This is an overall schematic diagram of a milling cutter according to one embodiment of the present invention; Figure 5 yes Figure 1 An enlarged schematic diagram of the structure of a milling cutter. This utility model provides a milling cutter 100, which includes a core 10, a peripheral cutting edge 20, and an end cutting edge 30. The core 10 includes a connected outer peripheral surface and an end surface; the peripheral cutting edge 20 is disposed on the outer peripheral surface; the end cutting edge 30 is disposed on the end surface and corresponds one-to-one with the peripheral cutting edge 20. The end cutting edge 30 includes a first arc cutting edge 31 and a second arc cutting edge 32, which are sequentially connected to the peripheral cutting edge 20. The first arc cutting edge 31 has a first radius of 4.8mm-7.2mm, and the second arc cutting edge 32 has a second radius of 0.26mm-0.39mm.

[0031] Specifically, the milling cutter 100 also includes a shank 40. A core 10 is disposed on one side of the shank 40, and the axis of the core 10 coincides with the axis of the shank 40. A peripheral cutting edge 20 is disposed around the outer peripheral surface and extends spirally from one end of the outer peripheral surface near the end face to the other end of the outer peripheral surface near the shank 40. The first radius is R1, and the second radius is R2. The first radius can be 4.8mm, 5.0mm, 6.0mm, 6.2mm, and 7.2mm, etc., and the second radius can be 0.26mm, 0.30mm, 0.32mm, 0.34mm, and 0.39mm, etc. The first arc-shaped cutting edge 31 and the second arc-shaped cutting edge 32 convex outwards from their respective end faces. It is understood that the shank 40 is used to connect with machining equipment. The first arc-shaped cutting edge 31 and the second arc-shaped cutting edge 32 can increase the cutting length of the end cutting edge 30. Simultaneously, the second arc-shaped cutting edge 32 prevents sharp corners at the connection between the end cutting edge 30 and the peripheral cutting edge 20, reducing the risk of chipping of the end cutting edge 30. If the first and second radii are too small, the cutting length of the end cutting edge 30 will not increase sufficiently; if the first and second radii are too large, the machining quality of the end cutting edge 30 will be reduced.

[0032] In this embodiment of the present invention, on the one hand, the first arc-shaped cutting edge 31 and the second arc-shaped cutting edge 32 increase the length of the end cutting edge 30. The longer end cutting edge 30 has a larger cutting width, which can reduce the cutting force on the end cutting edge 30 per unit length under the same feed rate, thereby enabling the milling cutter 100 to mill high-hardness metals with a larger feed rate. On the other hand, the increased cutting width of the end cutting edge 30 can reduce the thickness and increase the length of the chips generated by the end cutting edge 30 under the same feed rate, which is beneficial to heat dissipation during the machining process.

[0033] In one embodiment of this implementation, please refer to Figure 1 and Figure 5 The end-cutting edge 30 has a rake face 33, which is an arc-shaped surface. Along the axial direction of the core 10, the first end-cutting rake angle is equal at all points on the rake face 33, and the angle range is 3° to 7°. Specifically, the angle of the first end-cutting rake angle is θ, and the first end-cutting rake angle can take values ​​of 3°, 4°, 5°, 6°, and 7°, etc. It can be understood that setting the rake face 33 of the end-cutting edge 30 to be arc-shaped, and setting the angle range of the first end-cutting rake angle to 3° to 7°, is beneficial to improving the chip removal efficiency generated by the end-cutting edge 30 during milling, thereby improving the heat dissipation efficiency of the end-cutting edge 30.

[0034] In one embodiment of this implementation, please refer to Figure 1 and Figure 5The end cutting edge 30 has a first end cutting edge relief face (not shown) and a second end cutting edge relief face (not shown). The angle range of the first end cutting edge relief angle corresponding to the first end cutting edge relief face is 6.4°~9.6°, and the angle range of the second end cutting edge relief angle corresponding to the second end cutting edge relief face is 19.2°~28.8°. Specifically, the angle of the first end cutting edge relief angle is γ1, and the angle of the first end cutting edge relief angle can take values ​​of 6.4°, 7.9°, 8.0°, 8.1°, and 9.6°, etc. The angle of the second end cutting edge relief angle is γ2, and the angle of the second end cutting edge relief angle can take values ​​of 19.2°, 23.9°, 24.0°, 24.1°, and 28.8°, etc. It is understandable that if the first end cutting edge relief angle and the second end cutting edge relief angle are too large, it will reduce the strength of the end cutting edge 30; if the first end cutting edge relief angle and the second end cutting edge relief angle are too small, it will reduce the heat dissipation efficiency during the machining process. Setting the angle range of the first end blade back angle to 6.4°~9.6° and the angle range of the second end blade back angle to 19.2°~28.8° can, on the one hand, improve the strength of the end blade 30 and make it more wear-resistant, and on the other hand, reduce the risk of reduced heat dissipation efficiency of the end blade 30.

[0035] In one embodiment of this implementation, please refer to Figure 1 and Figure 5 There are multiple peripheral cutting edges 20 and multiple end cutting edges 30, which are connected one-to-one. A chip removal groove 23 is formed between two adjacent peripheral cutting edges 20, and a first chip receiving groove 34 and a second chip receiving groove 35 are formed between two adjacent end cutting edges 30. The first chip receiving groove 34, the second chip receiving groove 35 and the chip removal groove 23 are connected in sequence. The tooth backlash angle corresponding to the first chip receiving groove 34 is different from the tooth backlash angle corresponding to the second chip receiving groove 35. Multiple first chip receiving grooves 34 are interconnected at the center of the end face and form a concave chip receiving cavity 36. Specifically, the first chip receiving groove 34 is located on the side of the second chip receiving groove 35 near the end face. The first chip receiving groove 34 is concave relative to the second chip receiving groove 35, and multiple end cutting edges 30 do not pass through the center of the end face, so that multiple first chip receiving grooves 34 are connected at the center of the end face to form a chip receiving cavity 36. The end cutting edge 30 is chamfered near the first chip receiving groove 34. Understandably, during the milling process, the chips first gather in the chip cavity 36 at the center of the end face, and then are diverted through multiple second chip grooves 35 connected to the chip cavity 36 to flow out from multiple chip removal grooves 23. By setting the chip cavity 36, the space for the milling cutter 100 to accommodate chips is increased, thereby reducing the risk of chip blockage or chip removal difficulties. By setting a chamfer at the end edge 30 near the first chip groove 34, the risk of chipping of the end edge 30 can be reduced.

[0036] In one embodiment of this implementation, please refer to Figure 1Both the peripheral cutting edge 20 and the end cutting edge 30 are provided with 6. With this arrangement, when the chip width is small, the end mill 100 can have enough peripheral cutting edges 20 and end cutting edges 30 to participate in the cutting, which is beneficial to improving the service life of the end mill 100 and the machining quality of the end mill 100.

[0037] In one embodiment of this implementation, please refer to Figure 1 The peripheral cutting edge 20 extends helically along the axial direction of the tool holder 40, and the helix angle of the peripheral cutting edge 20 ranges from 30.4° to 45.6°. Specifically, the helix angle of the peripheral cutting edge 20 is β, and the range of the helix angle of the peripheral cutting edge 20 can be 30.4°, 37.8°, 38.0°, 38.2°, and 45.6°, etc. It is understandable that an excessively large or small helix angle will reduce the machining quality of the end mill 100. Setting the helix angle of the peripheral cutting edge 20 to a range of 30.4° to 45.6° helps to reduce the cutting resistance of the end mill 100, and at the same time helps to ensure the machining quality of the end mill 100 to a certain extent.

[0038] In one embodiment of this implementation, please refer to Figure 3 and Figure 4 , Figure 3 yes Figure 1 A schematic diagram of the cross-section of a milling cutter; Figure 4 yes Figure 3 This is an enlarged schematic diagram of a portion of the cross-section structure. The peripheral cutting edge 20 has a first peripheral rake face (not shown), and the angle range of the first peripheral rake angle corresponding to this first peripheral rake face is -9.6° to -14.4°. Specifically, the angle of the first peripheral rake angle is φ, and the first peripheral rake angle can take values ​​such as -9.6°, -11.8°, -12.0°, -12.2°, and -14.4°. It is understandable that if the first peripheral rake angle is too large, it will reduce the strength of the peripheral cutting edge 20; if the first peripheral rake angle is too small, it will increase the friction of the first peripheral rake face, causing the temperature of the first peripheral rake face to rise rapidly. Setting the angle range of the first peripheral rake angle to -9.6° to -14.4° is beneficial for ensuring sufficient strength in the peripheral cutting edge 20 and also helps to reduce cutting heat.

[0039] In one embodiment of this implementation, please refer to Figure 3 and Figure 4The peripheral cutting edge 20 has a first peripheral back face (not shown) and a second peripheral back face (not shown). The angle range of the first peripheral back angle corresponding to the first peripheral back face is 6.4°~9.6°, and the angle range of the second peripheral back angle corresponding to the second peripheral back face is 19.2°~28.8°. Specifically, the angle of the second peripheral back angle is α2, and the angle of the first peripheral back angle is α1. The first peripheral back angle can take values ​​of 6.4°, 7.8°, 8.0°, 8.2°, and 9.6°, etc. The angle of the second peripheral back angle can take values ​​of 19.2°, 23.8°, 24.0°, 24.2°, and 28.8°, etc. It is understood that if the first and second peripheral back angles are too large, it will reduce the strength of the peripheral cutting edge 20; if the first and second peripheral back angles are too small, it will reduce the heat dissipation efficiency of the peripheral cutting edge 20. Setting the first peripheral cutting edge clearance angle to a range of 6.4°~9.6° and the second peripheral cutting edge clearance angle to a range of 19.2°~28.8° improves the strength of the peripheral cutting edge 20, making it more wear-resistant, and also helps reduce the cutting heat of the peripheral cutting edge 20. For one embodiment of this method, please refer to... Figures 1 to 3 , Figure 2 yes Figure 1 A cross-sectional structural diagram of the milling cutter. The core 10 includes a first core 11 and a second core 12. The first core 11 is located on the side of the second core 12 near the end face. The first outer peripheral surface 111 of the first core 11 and the second outer peripheral surface 121 of the second core 12 are connected, and both are provided with peripheral cutting edges 20. The first core diameter of the first core 11 is smaller than the second core diameter of the second core 12. Specifically, the first core diameter is R3, which can be 2.1 mm, and the second core diameter is R4, which can be 2.4 mm. Multiple peripheral cutting edges 20 extend spirally on the first outer peripheral surface 111 and the second outer peripheral surface 121. Two adjacent peripheral cutting edges 20 work together with the first outer peripheral surface 111 and the second outer peripheral surface 121 to form a chip removal groove 23. Understandably, since the first core diameter is smaller than the second core diameter, the chip removal groove 23 distributed on the first core 11 has a larger depth, while the chip removal groove 23 distributed on the second core 12 has a smaller depth. This is beneficial to improving the chip removal capability of the milling cutter 100 when performing deep cavity cutting, and also helps to reduce the risk of the core 10 breaking due to insufficient strength.

[0040] In one embodiment of this implementation, please refer to Figures 1 to 3 There are multiple peripheral cutting edges 20 and end cutting edges 30, and they are connected one-to-one. The peripheral cutting edge 20 on the first core 11 is defined as the first cutting edge 21, and the peripheral cutting edge 20 on the second core 12 is defined as the second cutting edge 22. A first chip removal groove 231 is formed between two adjacent first cutting edges 21, and a second chip removal groove 232 is formed between two adjacent second cutting edges 22. The first chip removal groove 231 and the second chip removal groove 232 are connected by a circular arc surface 13.

[0041] Specifically, multiple arc-shaped surfaces 13 are disposed in the chip removal groove 23. The arc-shaped surfaces 13 transitionally connect the first outer peripheral surface 111 and the second outer peripheral surface 121, and the arc-shaped surfaces 13 also transitionally connect the second outer peripheral surface 121 and the peripheral surface of the tool holder 40. It is understood that during the cutting process of the milling cutter 100, some chips are discharged after passing through the first chip removal groove 231 and the second chip removal groove 232 in sequence. Since the depths of the first chip removal groove 231 and the second chip removal groove 232 are different, and the second core diameter and the diameter of the tool holder 40 are different, the arc-shaped surfaces 13 reduce the resistance encountered by the chips when entering the second chip removal groove 232 from the first chip removal groove 231, and also reduce the resistance encountered by the chips when being discharged from the second chip removal groove 232.

[0042] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A milling cutter, characterized in that, include: The core includes a connected outer peripheral surface and an end face; A peripheral blade is provided on the outer peripheral surface; An end blade is disposed on the end face and is disposed in a one-to-one correspondence with the peripheral blade. The end blade includes a first arc blade and a second arc blade. The first arc blade, the second arc blade and the peripheral blade are connected in sequence. The first radius of the first arc blade is 4.8mm-7.2mm and the second radius of the second arc blade is 0.26mm-0.39mm.

2. A milling cutter according to claim 1, characterized in that, The end cutting edge has a rake face, which is an arc-shaped surface. In the axial direction of the core, the rake angle of the first end cutting edge corresponding to each point of the rake face is equal, and the angle range is 3°~7°.

3. A milling cutter according to claim 2, characterized in that, The end cutting edge has a first end cutting edge relief face and a second end cutting edge relief face. The angle range of the first end cutting edge relief angle corresponding to the first end cutting edge relief face is 6.4°~9.6°, and the angle range of the second end cutting edge relief angle corresponding to the second end cutting edge relief face is 19.2°~28.8°.

4. A milling cutter according to claim 1, characterized in that, The number of peripheral cutting edges and end cutting edges are both multiple and are connected in a one-to-one correspondence. A chip removal groove is formed between two adjacent peripheral cutting edges, and a first chip receiving groove and a second chip receiving groove are formed between two adjacent end cutting edges. The first chip receiving groove, the second chip receiving groove and the chip removal groove are connected in sequence. The tooth back angle corresponding to the first chip receiving groove and the tooth back angle corresponding to the second chip receiving groove are different. Multiple first chip receiving grooves are connected to each other at the center of the end face and form a concave chip receiving cavity.

5. A milling cutter according to claim 4, characterized in that, Both the peripheral blade and the end blade are provided with 6 blades.

6. A milling cutter according to claim 1, characterized in that, The peripheral blade extends spirally along the axial direction of the core, and the spiral angle of the peripheral blade ranges from 30.4° to 45.6°.

7. A milling cutter according to claim 1, characterized in that, The peripheral cutting edge has a first peripheral cutting edge rake face, and the angle range of the first peripheral cutting edge rake angle corresponding to the first peripheral cutting edge rake face is -9.6° to -14.4°.

8. A milling cutter according to claim 1, characterized in that, The circumferential cutting edge has a first circumferential cutting edge face and a second circumferential cutting edge face. The angle range of the first circumferential cutting edge face corresponding to the first circumferential cutting edge face is 6.4°~9.6°, and the angle range of the second circumferential cutting edge face corresponding to the second circumferential cutting edge face is 19.2°~28.8°.

9. A milling cutter according to claim 1, characterized in that, The core includes a first core and a second core. The first core is located on the side of the second core near the end face. The first outer peripheral surface of the first core and the second outer peripheral surface of the second core are connected and both are provided with the peripheral blade. The first core diameter of the first core is smaller than the second core diameter of the second core.

10. A milling cutter according to claim 9, characterized in that, The number of peripheral blades and end blades are both multiple and are connected in a one-to-one correspondence. The peripheral blade on the first core is defined as the first blade part, and the peripheral blade on the second core is defined as the second blade part. A first chip removal groove is formed between two adjacent first blade parts, and a second chip removal groove is formed between two adjacent second blade parts. The first chip removal groove and the second chip removal groove are connected by a circular arc surface transition.

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