Milling cutter
By designing a milling cutter with a lelo triangle cross-section and multiple cutting edges, the problems of low machining efficiency, fast wear and transverse side walls in the prior art are solved, and efficient and good quality material escape processing and angle cleaning processing are achieved.
Patent Information
- Application Number
- CN202421199947.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-28
- Publication Date
- 2025-02-28
- Estimated Expiration
- 2034-05-28
AI Technical Summary
When processing parts to be processed with high hardness and good toughness, the existing milling cutters are low in processing efficiency and are prone to wear due to bonded chips. The side walls after processing are prone to cross-grains, which have a poor appearance.
A milling cutter is designed, including a tool holder, a first cutting part and a second cutting part. The cross-section of the first cutting part is a Lelo triangle, the second cutting part includes a core part and a plurality of cutting edges, through which material escape processing is performed, and the first cutting part is used for angle cleaning processing.
This milling cutter is not prone to wear due to bonded material chips during processing. There is no cross-grain on the side wall of the processed part to be processed after processing, it has a good appearance and a high cutting quality. It can also achieve material escape processing and angle cleaning processing through a milling cutter, which improves processing efficiency.
Smart Images
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Abstract
Description
Technical Field
[0001] The present application relates to the technical field of cutting tools, and in particular to a milling cutter. Background Art
[0002] When machining a part, two types of milling cutters are currently used for material escaping and corner cleaning, respectively, because the workpiece has the characteristics of high hardness, good toughness, and low thermal conductivity. However, this machining method has a low machining efficiency, the milling cutter is easily worn due to the bonding of the chips during machining, and the side wall of the workpiece after machining will have horizontal lines, which has a poor appearance. Utility Model Content
[0003] In view of the above, it is necessary to propose a milling cutter to reduce the wear of the milling cutter during cutting, ensure the cutting quality and improve the processing efficiency.
[0004] An embodiment of the present application provides a milling cutter, including a shank, the milling cutter also including a first cutting part and a second cutting part, the first cutting part is connected between the shank and the second cutting part, the cross-section of the first cutting part is a Reuleaux triangle, the second cutting part includes a core and a plurality of cutting edges spaced apart at the periphery of the core, one end of the core and one end of each of the cutting edges are connected to the first cutting part, the plurality of cutting edges are used for performing material evacuation processing on a workpiece, and the first cutting part is used for performing corner clearing processing on the workpiece.
[0005] In some embodiments, the rake angle of the cutting edge ranges from -1° to 1°.
[0006] In some embodiments, the milling cutter satisfies the following conditional formula:
[0007] d4 = (30% - 31%) × D;
[0008] Wherein, d4 is the diameter of the core of the second cutting portion, and D is the maximum length of the second cutting portion along the radial direction of the shank.
[0009] In some embodiments, a diameter of the core of the second cutting portion ranges from 2.5 mm to 3.5 mm.
[0010] In some embodiments, the angle between the front cutting surface of at least one of the plurality of cutting edges and the back cutting surface of the adjacent cutting edge is in the range of 92°-98°.
[0011] In some embodiments, the first cutting portion includes three arc-shaped cutting surfaces connected in sequence, and the diameter corresponding to each of the arc-shaped cutting surfaces ranges from 8 mm to 9 mm.
[0012] In some embodiments, there are three cutting edges, and they are arranged in one-to-one correspondence with the three arc-shaped cutting surfaces respectively.
[0013] In some embodiments, a chip groove is formed between two adjacent cutting edges, and the chip groove extends along the axial direction of the tool holder.
[0014] In some embodiments, a clearance groove is provided on the periphery of each cutting edge.
[0015] In some embodiments, the cutting profile of the first cutting portion and the cutting profile of the second cutting portion are both circular, and the diameter of the cutting profile of the first cutting portion and the diameter of the cutting profile of the second cutting portion are equal.
[0016] The above-mentioned milling cutter first performs material escaping processing on the workpiece through multiple cutting edges, and then performs corner cleaning processing on the workpiece through the first cutting portion with a Reuleaux triangle cross section. During processing, the milling cutter is not easily worn due to bonding of material chips, and no transverse lines appear on the side wall of the workpiece after processing. The side wall of the workpiece has a good appearance and high cutting quality. In addition, two types of processing of the workpiece, namely, material escaping processing and corner cleaning processing, can be achieved by one milling cutter. There is no need to change the cutter during cutting. The milling cutter has high processing efficiency and does not require tool change. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the structure of the milling cutter provided in an embodiment of the present application.
[0018] Figure 2 yes Figure 1 Bottom view of the milling cutter shown.
[0019] Figure 3 yes Figure 1 A cross-sectional view of the cutting edge in the milling cutter shown along the AA direction.
[0020] Figure 4 yes Figure 1 Partial side view of the cutting edge in the milling cutter shown.
[0021] Main component symbols
[0022] Milling cutter 100
[0023] Handle 10
[0024] First cutting part 20
[0025] Curved cutting surface 21
[0026] Second cutting part 30
[0027] Core 301
[0028] Cutting edge 31
[0029] Avoidance slot 311
[0030] Rake face 312
[0031] Flank 313
[0032] Chip groove 32 DETAILED DESCRIPTION
[0033] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.
[0034] In the description of the present application, it should be understood that the terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, it should be noted that the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.
[0035] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0036] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings.
[0037] Please refer to Figures 1 to 4 The embodiment of the present application provides a milling cutter 100 for machining a workpiece having a hole structure, wherein the hole structure may be a blind hole or a through hole. Specifically, the milling cutter 100 includes a tool handle 10, a first cutting portion 20 and a second cutting portion 30, wherein the first cutting portion 20 is connected between the tool handle 10 and the second cutting portion 30.
[0038] The cross-section of the first cutting portion 20 is a Reuleaux triangle, and the second cutting portion 30 includes a core 301 and a plurality of cutting edges 31 evenly spaced on the periphery of the core 301, one end of the core 301 and one end of each cutting edge 31 are connected to the first cutting portion 20, the plurality of cutting edges 31 are used for Lost Material Machining of the workpiece, and the first cutting portion 31 is used for Break Corner Machining of the workpiece.
[0039] It can be understood that the material escape processing is to use the milling cutter 100 to quickly process the workpiece to be processed to reduce the excess to a minimum, thereby processing a hole structure on the workpiece to be processed; during the corner cleaning processing, the milling cutter 100 is used to process the hole structure on the workpiece to be processed to remove burrs and transverse lines on the hole wall of the hole structure.
[0040] The tool handle 10 is a columnar structure, wherein the tool handle 10 is clamped by a machine chuck.
[0041] The first cutting portion 20 includes three arc-shaped cutting surfaces 21 connected in sequence, and the diameter corresponding to each arc-shaped cutting surface 21 ranges from 8 mm to 9 mm.
[0042] The maximum length L1 of the first cutting portion 20 along the radial direction of the shank 10 is equal to the maximum length L2 of the second cutting portion 30 along the radial direction of the shank 10. There are three cutting edges 31, and they are respectively arranged in one-to-one correspondence with the three arc-shaped cutting surfaces 21. A chip groove 32 is formed between two adjacent cutting edges 31, and the chip groove 32 extends along the axial direction of the shank 10, that is, the chip groove 32 is a straight groove, not a spiral groove, and the groove length of the chip groove 32 ranges from 15mm to 19mm, which is conducive to the discharge of cutting debris during the processing of the first cutting portion 20 and the second cutting portion 30. The outer periphery of each cutting edge 31 is provided with an avoidance groove 311, so that the surface of the workpiece to be processed can be prevented from being scratched when the first cutting portion 20 and the second cutting portion 30 are switched.
[0043] See also Figure 2 , the value range of the rake angle β1 of the cutting edge 31 is -1°-1°. In this way, the cutting strength of the cutting edge 31 can be increased. In this embodiment, the rake angle β1 of the cutting edge 31 is 0°.
[0044] In some embodiments, the milling cutter 100 satisfies the following conditional formula:
[0045] d4 = (30% - 31%) × D;
[0046] Wherein, d4 is the diameter of the core portion 301 of the second cutting portion 30 , and D is the maximum length of the second cutting portion 30 along the radial direction of the shank 10 .
[0047] Among them, the diameter of the core 301 of the second cutting portion 30 has a value range of 2.5mm-3.5mm. In this embodiment, the diameter of the core 301 of the second cutting portion 30 is 3mm. In this way, when the above-mentioned value range is met, the rigidity of the milling cutter 100 can be guaranteed, and the problem of chip blockage is not easy to occur. When the diameter of the core 301 is greater than 3.5mm, the chip space will be insufficient, resulting in chip blockage; when the diameter of the core 301 is less than 2.5mm, the rigidity of the milling cutter 100 will be poor, and it will be easy to break during the cutting process.
[0048] The value range of the angle SA between the rake face 312 of a cutting edge 31 and the flank face 313 of the adjacent cutting edge 31 is 92°-98°. In this embodiment, the value range of the angle SA between the rake face 312 of a cutting edge 31 and the flank face 313 of the adjacent cutting edge 31 is 95°. This is conducive to the discharge of cutting debris during the cutting process.
[0049] See also Figure 3 The value range of the avoidance angle α1 of the cutting edge 31 is 55°-65°, which helps to reduce the friction between the cutting edge 31 and the chips, making it easier to discharge the chips, reducing the heat generation, and improving the life of the milling cutter 100. In this embodiment, the value of the avoidance angle α1 of the cutting edge 31 is 60°
[0050] The rear width f1 of the peripheral edge of the cutting edge 31 has a value range of 0.4 mm to 0.55 mm. In this embodiment, the rear width f1 of the peripheral edge of the cutting edge 31 has a value of 0.5 mm. In this way, a discharge space is provided for the chips, the friction between the cutting edge 31 and the chips and the heat between the two are reduced, which helps to improve the life of the milling cutter 100 and the quality of the machined surface.
[0051] See also Figure 4 In some embodiments, the first clearance angle α2 of the bottom edge of the cutting edge 31 is in the range of 7°-9°. In this embodiment, the first clearance angle α2 of the bottom edge of the cutting edge 31 is 8°, which can increase the strength of the end tooth surface of the milling cutter 100. The second clearance angle α3 is in the range of 14°-18°. In this embodiment, the second clearance angle α3 is 16°, which can avoid the first clearance angle α3, help provide additional space for chip formation and discharge, reduce wear on the end of the milling cutter 100, and improve cutting ability.
[0052] In some embodiments, the width f2 of the first back angle α2 of the bottom edge of the cutting edge 31 is in the range of 0.5mm-1.5mm. In this embodiment, the width f2 of the first back angle α2 of the bottom edge of the cutting edge 31 is 1mm. This provides space for chip discharge, reduces friction and heat between the cutting edge 31 and the chips, and helps to improve the life of the milling cutter 100 and the quality of the processed surface.
[0053] The implementation process of the milling cutter 100 provided in the embodiment of the utility model is as follows:
[0054] The tool holder 10 is clamped by a machine chuck, and the three cutting edges 31 of the second cutting portion 30 are first used to perform material removal processing on the workpiece, and then the first cutting portion 31 with a Reuleaux triangle cross section is used to perform corner cleaning processing on the workpiece, thereby processing a hole structure on the workpiece.
[0055] The above-mentioned milling cutter 100 first performs material escaping processing on the workpiece through multiple cutting edges 31, and then performs corner cleaning processing on the workpiece through the first cutting portion 31 with a cross-section of a Leroy triangle. During processing, the milling cutter 100 is not easily worn due to bonding of material chips, and no transverse lines will appear on the side walls of the workpiece after processing. The side walls of the workpiece have a good appearance and a high cutting quality. In addition, two types of processing of the workpiece can be achieved by a milling cutter 100, namely, material escaping processing and corner cleaning processing. There is no need to change the tool during cutting, and the processing efficiency of the milling cutter 100 is relatively high. Furthermore, the milling cutter 100 of the embodiment of the present application can process square holes in one go without corner cleaning, and the efficiency is greatly improved. It can improve the strength of the milling cutter 100, reduce the wear and tear of the milling cutter 100, and ultimately improve the life of the milling cutter 100, the surface quality of the product, and reduce production costs.
[0056] It is obvious to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present application.
[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the preferred embodiments, a person of ordinary skill in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.
Claims
1. A milling cutter, comprising a tool handle, characterized in that: The milling cutter also includes a first cutting part and a second cutting part, the first cutting part is connected between the shank and the second cutting part, the cross-section of the first cutting part is a Reuleaux triangle, the second cutting part includes a core and a plurality of cutting edges spaced at intervals on the outer periphery of the core, one end of the core and one end of each of the cutting edges are connected to the first cutting part, the plurality of cutting edges are used for performing material evacuation processing on the workpiece, and the first cutting part is used for performing corner clearing processing on the workpiece.
2. The milling cutter according to claim 1, characterized in that The rake angle of the cutting edge ranges from -1° to 1°.
3. The milling cutter according to claim 1, characterized in that The milling cutter meets the following conditional formula: d4 = (30% - 31%) × D; Wherein, d4 is the diameter of the core of the second cutting portion, and D is the maximum length of the second cutting portion along the radial direction of the shank.
4. The milling cutter according to claim 3, characterized in that The diameter of the core of the second cutting portion ranges from 2.5 mm to 3.5 mm.
5. The milling cutter according to claim 1, characterized in that The value range of the included angle between the front cutting face of at least one of the plurality of cutting edges and the back cutting face of the adjacent cutting edge is 92°-98°.
6. The milling cutter according to claim 1, characterized in that The first cutting portion includes three arc-shaped cutting surfaces connected in sequence, and the diameter corresponding to each of the arc-shaped cutting surfaces ranges from 8 mm to 9 mm.
7. The milling cutter according to claim 6, characterized in that There are three cutting edges, which are respectively arranged in one-to-one correspondence with the three arc-shaped cutting surfaces.
8. The milling cutter according to claim 1, characterized in that A chip groove is formed between two adjacent cutting edges, and the chip groove extends along the axial direction of the tool holder.
9. The milling cutter according to claim 1, characterized in that The outer periphery of each cutting edge is provided with a avoiding groove.
10. The milling cutter according to claim 1, characterized in that A maximum length of the first cutting portion along a radial direction of the tool handle is equal to a maximum length of the second cutting portion along a radial direction of the tool handle.