Forming milling cutter
By using a split groove design and axial plane enhancement to strengthen the cutting edge of the forming milling cutter, the chipping and vibration problems caused by inconsistent radial rake angles were solved, achieving stable cutting results.
Patent Information
- Application Number
- CN202423307685.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2034-12-30
AI Technical Summary
When using existing forming milling cutters to machine the inner frame of electronic products, the strength at the maximum radial rake angle is weak and prone to chipping, while the minimum radial rake angle is not sharp and prone to vibration, resulting in horizontal lines and vibration phenomena.
It adopts a split groove design, with different helical angles in the first and second sections, and the radial rake angle difference is controlled within 0°-4°. An axial plane is set on the rake face of the third cutting edge to enhance the cutting edge strength.
It improves the cutting stability of the forming milling cutter, reduces the risk of chipping and vibration, and ensures machining quality.
Smart Images
Figure CN223819711U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of cutters, in particular to a profile milling cutter. BACKGROUND
[0002] In the process of processing electronic product middle frames, the processing requirements of the surface of the electronic product middle frame are high, and phenomena such as cross lines and chatter marks are not allowed to appear at the profile surface. The maximum radial rake angle of the profile area of the current profile milling cutter is quite different from the minimum radial rake angle. In the process of processing electronic products, the maximum radial rake angle is weak and prone to collapse, which causes cross line abnormalities of the electronic product, and the minimum radial rake angle is not sharp and prone to chatter. CONTENT OF THE UTILITY MODEL
[0003] Therefore, it is necessary to provide a profile milling cutter to improve the technical problems of collapse and chatter of the current profile milling cutter in the process of milling workpieces.
[0004] An embodiment of the present application provides a profile milling cutter for cutting a stepped surface. The profile milling cutter comprises a tool shank and a tool head connected with the tool shank and located at one end of the tool shank. The tool head comprises a first section and a second section arranged along the axial direction of the profile milling cutter, and the first section is located between the tool shank and the second section. The first section comprises a first groove arranged in a spiral manner, the second section comprises a second groove arranged in a spiral manner, the first groove and the second groove are connected, and the spiral angle of the first groove is different from the spiral angle of the second groove.
[0005] In the profile milling cutter, the split groove design is adopted, the first groove and the second groove can be machined according to different spiral angles by the technical personnel, which is beneficial to reduce the deviation of the radial rake angle at different positions of the profile milling cutter, so that the whole blade line of the profile milling cutter tends to be gentle, the strength of each part of the cutting edge is consistent, the cutting stability is better, and the risk of collapse and chatter of the profile milling cutter in the process of milling workpieces is reduced.
[0006] In at least one embodiment, the first section further comprises a first cutting edge arranged in a spiral manner, and the first cutting edge and the first groove are arranged adjacent to each other. The second section further comprises a second cutting edge, and the second cutting edge and the second groove are arranged adjacent to each other. The radial rake angle of the first cutting edge is γ1, the radial rake angle of the second cutting edge is γ2, and 0°≤|γ1-γ2|≤4°.
[0007] By setting the difference between the radial rake angle of the first cutting edge and the radial rake angle of the second cutting edge to be 0°-4°, it is beneficial to ensure that the blade line of the first cutting edge and the blade line of the second cutting edge tend to be gentle while improving the strength of the first cutting edge and the second cutting edge, and thus improving the cutting stability of the profile milling cutter.
[0008] In at least one embodiment, γ1 = 6°-10°, γ2 = 6°-10°. By setting the radial rake angle of the first cutting edge and the radial rake angle of the second cutting edge to both range from 6° to 10°, the risk of chipping due to low cutting edge strength caused by an excessively large radial rake angle can be reduced, as can the risk of vibration during workpiece cutting caused by an excessively small radial rake angle can also be reduced.
[0009] In at least one embodiment, the helix angle of the first groove is δ1, and the helix angle of the second groove is δ2, where δ1 > δ2. By setting the helix angle of the first groove to be greater than that of the second groove, it is beneficial to enhance the edge strength of the first cutting edge.
[0010] In at least one embodiment, δ1 = 35°-40°, δ2 = 20°-30°. By machining the first groove with a helical angle of 35°-40° and the second groove with a helical angle of 20°-30°, it is beneficial to ensure the consistency of the radial front angle in the first segment and the radial front angle in the second segment.
[0011] In at least one embodiment, the cutter head further includes a third cutting edge disposed radially along the forming milling cutter. The third cutting edge is located at the junction of the first groove and the second groove. One end of the third cutting edge is connected to the first cutting edge, and the other end of the third cutting edge is connected to the second cutting edge. The rake face of the third cutting edge is provided with an axial plane, which is distributed along the axial direction of the forming milling cutter.
[0012] The inclusion of a third cutting edge enables the machining of stepped surfaces. Furthermore, by adding an axial plane to the rake face of the third cutting edge, the stress on the rake face can be reduced, thereby enhancing the strength of the third cutting edge. This addresses the issue of weak edge strength in form milling cutters, further reducing the risk of chipping and vibration during workpiece milling.
[0013] In at least one embodiment, the extension length of the axial plane connecting with the second groove is Ls, where Ls ≥ 0.2 mm. By setting the extension length of the axial plane connecting with the second groove to be greater than or equal to 0.2 mm, it is beneficial to ensure normal chip removal of the form milling cutter when milling the workpiece.
[0014] In at least one embodiment, the width of the narrowest point where the rake face of the third cutting edge meets the first groove ranges from 0.04 mm to 0.09 mm. By designing the width of the narrowest point where the rake face of the third cutting edge meets the first groove to range from 0.04 mm to 0.09 mm, it is beneficial to ensure the cutting edge strength and cutting performance of the third cutting edge.
[0015] In at least one embodiment, in the first cutting edge, the first radial clearance angle is 12° and the second radial clearance angle is 25°. In the second cutting edge, the first radial clearance angle is 12° and the second radial clearance angle is 25°. In the third cutting edge, the first radial clearance angle is 12° and the second radial clearance angle is 25°.
[0016] By setting the first radial clearance angle of the first cutting edge, the first radial clearance angle of the second cutting edge, and the first radial clearance angle of the third cutting edge to all be 12°, and the second radial clearance angle of the first cutting edge, the second radial clearance angle of the second cutting edge, and the second radial clearance angle of the third cutting edge to all be 25°, it helps to ensure the edge strength of the cutting edge in the form milling cutter while satisfying the clearance of the flank face in the form milling cutter, thereby further reducing the risk of cross-line marks caused by edge chipping of the form milling cutter.
[0017] In at least one embodiment, the axial first clearance angle of the third cutting edge ranges from 8° to 10°, and the axial second clearance angle ranges from 14° to 16°. By setting the axial first clearance angle of the third cutting edge to range from 8° to 10° and the axial second clearance angle of the third cutting edge to range from 14° to 16°, the third cutting edge can avoid obstruction in the axial direction of the forming milling cutter. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the structure of the forming milling cutter provided in the embodiments of this application;
[0019] Figure 2 yes Figure 1 A schematic diagram of the partial structure of the cutting head of the forming milling cutter shown;
[0020] Figure 3 This is a schematic diagram of the structure of the first section of the forming milling cutter when viewed along the axial direction of the forming milling cutter.
[0021] Figure 4 This is a schematic diagram of the second section of the forming milling cutter when viewed along its axial direction.
[0022] Figure 5 This is a partial structural diagram of the cutter head when viewed radially along the form milling cutter.
[0023] Explanation of key component symbols:
[0024] 100. Forming cutter; 10. Cutter head; 11. First section; 111. First groove; 112. First cutting edge; 12. Second section; 121. Second groove; 122. Second cutting edge; 13. Third cutting edge; 14. Axial plane; 20. Tool holder.
[0025] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation
[0026] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.
[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
[0028] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0029] Please see Figure 1 One embodiment of this application provides a form milling cutter 100 for cutting stepped surfaces. The form milling cutter 100 includes a cutter head 10 and a tool holder 20. The tool holder 20 is typically used to be clamped for mounting on a cutting device (not shown), such as a CNC machine tool, with the cutter head 10 connected to and located at one end of the tool holder 20.
[0030] In this embodiment, the cutter head 10 and the cutter shank 20 are integrally formed. This integrally formed structure not only improves the overall structural strength of the form milling cutter 100 but also simplifies the manufacturing process.
[0031] In other embodiments, the cutter head 10 and the cutter shank 20 can also be connected by welding, screwing, or other methods. This application does not limit this, and those skilled in the art can choose according to the actual situation.
[0032] Please refer to the following: Figure 2 and Figure 3 In this embodiment, the cutter head 10 includes a first section 11 and a second section 12 arranged along the axial direction of the forming milling cutter 100, with the first section 11 located between the shank 20 and the second section 12.
[0033] In this embodiment, the first segment 11 includes a first groove 111 and a first cutting edge 112, both of which are helically arranged. The first cutting edge 112 is used to machine the sidewall of the workpiece. Along the circumferential direction of the forming milling cutter 100, the first groove 111 and the first cutting edge 112 are distributed adjacent to each other. The radial rake angle of the first cutting edge 112 is defined as γ1, and the helical angle of the first groove 111 is defined as δ1.
[0034] Please refer to the following: Figure 2 and Figure 4In this embodiment, the second segment 12 includes a second groove 121 and a second cutting edge 122. Both the second groove 121 and the second cutting edge 122 are spirally arranged. The second cutting edge 122 is used to machine the sidewall of the workpiece. Along the circumferential direction of the forming milling cutter 100, the second groove 121 and the second cutting edge 122 are distributed adjacent to each other. The radial rake angle of the second cutting edge 122 is defined as γ2, and the helical angle of the second groove 121 is defined as δ2.
[0035] Please see Figure 2 In this embodiment, the first groove 111 and the second groove 121 are connected, and the helix angle δ1 of the first groove 111 is different from that of the second groove 121. It can be understood that when manufacturing the forming milling cutter 100, the first segment 11 is machined along the helix angle δ1 to form the first groove 111 and the first cutting edge 112. The second segment 12 is machined along the helix angle δ2 to form the second groove 121 and the second cutting edge 122.
[0036] It is worth noting that the cutting edge of the form milling cutter 100 is composed of the cutting edge of the first cutting edge 112 and the cutting edge of the second cutting edge 122. Specifically, the cutting edge of the first cutting edge 112 refers to the edge line of the first cutting edge 112 that contacts the workpiece during machining. Similarly, the cutting edge of the second cutting edge 122 refers to the edge line of the second cutting edge 122 that contacts the workpiece during machining.
[0037] The aforementioned forming milling cutter 100 adopts a split groove design, which can process the first groove 111 and the second groove 121 separately according to different helix angles. This helps to reduce the deviation of the radial rake angle at different positions in the forming milling cutter 100 (specifically, the radial rake angle γ1 of the first cutting edge 112 and the radial rake angle γ2 of the second cutting edge 122), so that the entire cutting edge of the forming milling cutter 100 tends to be gentle, the strength of the cutting edges (specifically the first cutting edge 112 and the second cutting edge 122) is more consistent, the cutting stability is better, and thus the risk of chipping and vibration of the forming milling cutter 100 when milling workpieces is reduced.
[0038] Since the first segment 11 is closer to the shank 20 than the second segment 12, the edge strength of the first cutting edge 112 near the shank 20 will be insufficient due to its contour shape and helical structure. Specifically, the part where the first cutting edge 112 meets the shank 20 is not strong enough.
[0039] In this embodiment, δ1 > δ2, that is, the helix angle of the first groove 111 is greater than the helix angle of the second groove 121, which is beneficial to increase the wedge angle of the part where the first cutting edge 112 meets the tool holder 20, thereby enhancing the edge strength of the helical first cutting edge 112.
[0040] In this embodiment, the helix angle δ1 of the first groove 111 is 35°-40°. The helix angle δ2 of the second groove 121 is 20°-30°. By limiting the range of the helix angle δ1 to 35°-40° and the range of the helix angle δ2 to 20°-30°, it is beneficial to ensure the consistency of the radial front angle γ1 in the first segment 11 and the radial front angle γ2 in the second segment 12.
[0041] Please refer to the following: Figures 2 to 4 In this embodiment, 0° ≤ |γ1-γ2| ≤ 4°. In other words, the difference between the radial rake angle γ1 of the first cutting edge 112 and the radial rake angle γ2 of the second cutting edge 122 is in the range of 0°-4°.
[0042] By setting the difference between the radial rake angle γ1 of the first cutting edge 112 and the radial rake angle γ2 of the second cutting edge 122 to a range of 0°-4°, it is beneficial to improve the strength of the first cutting edge 112 and the second cutting edge 122 while ensuring that the cutting lines of the first cutting edge 112 and the second cutting edge 122 tend to be gentle, thereby improving the cutting stability of the forming milling cutter 100.
[0043] In this embodiment, γ1 = 6°-10° and γ2 = 6°-10°. By setting the radial rake angle γ1 of the first cutting edge 112 and the radial rake angle γ2 of the second cutting edge 122 to both be in the range of 6°-10°, the risk of chipping due to low strength of the cutting edges (specifically the first cutting edge 112 and the second cutting edge 122) caused by excessively large radial rake angles (specifically the radial rake angle γ1 of the first cutting edge 112 and the radial rake angle γ2 of the second cutting edge 122) can be reduced. Furthermore, the risk of vibration during workpiece cutting caused by excessively small radial rake angles can also be reduced.
[0044] As an example, the helix angle δ1 of the first groove 111 is 36°, and the helix angle δ2 of the second groove 121 is 25°. The radial rake angle γ1 of the first cutting edge 112 is 8°, and the radial rake angle γ2 of the second cutting edge 122 is 6°.
[0045] In other embodiments, the helix angle δ1 of the first groove 111, the helix angle δ2 of the second groove 121, the radial rake angle γ1 of the first cutting edge 112, and the radial rake angle γ2 of the second cutting edge 122 may also be other angles. This application does not limit this, and those skilled in the art can choose according to the actual situation.
[0046] Please refer to the following: Figure 2 and Figure 5In this embodiment, the cutter head 10 further includes a third cutting edge 13 arranged radially along the forming milling cutter 100. The third cutting edge 13 is located at the junction of the first groove 111 and the second groove 121 (specifically, on the stepped structure where the first segment 11 and the second segment 12 meet). One end of the third cutting edge 13 is connected to the first cutting edge 112, and the other end of the third cutting edge 13 is connected to the second cutting edge 122. The third cutting edge 13 is used to machine the stepped surface of the workpiece.
[0047] In this embodiment, the rake face of the third cutting edge 13 is provided with an axial plane 14, which is distributed along the axial direction of the forming milling cutter 100.
[0048] By setting an axial plane 14 on the rake face of the third cutting edge 13, the force on the rake face of the third cutting edge 13 can be reduced, thereby enhancing the strength of the third cutting edge 13, improving the problem of weak edge strength of the third cutting edge 13 in the form milling cutter 100, and further reducing the risk of chipping and vibration when the form milling cutter 100 is milling the workpiece.
[0049] In this embodiment, the axial plane 14 is formed by backlash grinding. Specifically, the backlash opening angle of the gear grinding machine is set to 65°, and the axial rake angle ranges from 22° to 30°. The gear grinding machine grinds and flattens the part where the first groove 111 meets the third cutting edge 13 (specifically on the rake face of the third cutting edge 13) to form the aforementioned axial plane 14.
[0050] In other embodiments, other processing methods may also be used, and this application does not limit them. Those skilled in the art can choose according to the actual situation.
[0051] Please see Figure 2 In this embodiment, the extension length of the axial plane 14 connecting with the second groove 121 is Ls, where Ls ≥ 0.2 mm. By setting the extension length of the axial plane 14 connecting with the second groove 121 to be greater than or equal to 0.2 mm, it is beneficial to ensure normal chip removal of the forming milling cutter 100 when milling the workpiece.
[0052] Please see Figure 5 In this embodiment, the width Ln at the narrowest point where the rake face of the third cutting edge 13 meets the first groove 111 ranges from 0.04mm to 0.09mm. By designing the width Ln at the narrowest point where the rake face of the third cutting edge 13 meets the first groove 111 to range from 0.04mm to 0.09mm, it is beneficial to ensure the cutting edge strength and cutting performance of the third cutting edge 13.
[0053] Please refer to the following: Figures 2 to 4In this embodiment, the outer diameter of the first cutting edge 112 is D1, and the core thickness of the first cutting edge 112 is (40%-50%)D1. The first radial clearance angle α1 of the first cutting edge 112 is 12°, and the second radial clearance angle α2 of the first cutting edge 112 is 25°. The outer diameter of the second cutting edge 122 is D2, and the outer diameter of the first cutting edge 112, D1, is greater than the outer diameter of the second cutting edge 122, D2.
[0054] The core thickness of the second cutting edge 122 is (40%-50%) D2. The first radial clearance angle α3 of the second cutting edge 122 is 12°, and the second radial clearance angle α4 of the second cutting edge 122 is 25°. The first radial clearance angle of the third cutting edge 13 is 12°, and the second radial clearance angle of the third cutting edge 13 is 25°.
[0055] The dimensional design of the first cutting edge 112, the second cutting edge 122, and the third cutting edge 13 helps to ensure the edge strength of the entire cutting edge in the form milling cutter 100 while satisfying the clearance of the flank face in the form milling cutter 100, thereby further reducing the risk of cross-line marks caused by edge chipping of the form milling cutter 100.
[0056] Please see Figure 5 In this embodiment, the axial first clearance angle αn1 of the third cutting edge 13 ranges from 8° to 10°, and the axial second clearance angle αn2 of the third cutting edge 13 ranges from 14° to 16°. By setting the axial first clearance angle αn1 of the third cutting edge 13 to range from 8° to 10° and the axial second clearance angle αn2 of the third cutting edge 13 to range from 14° to 16°, the third cutting edge 13 can avoid obstruction in the axial direction of the forming milling cutter 100.
[0057] The working process of the form milling cutter 100 provided in this application is as follows: the cutter holder is clamped using a cutting device, and then the cutter holder 20 is driven to move to the workpiece, and the cutter head 10 mills the surface of the workpiece. Because the cutter head 10 adopts a split groove structure design, it independently processes the first groove 111 and the second groove 121, forming radial rake angles at different cutting positions. This helps to reduce the deviation of the radial rake angle at different positions in the form milling cutter 100, making the entire cutting edge of the form milling cutter 100 more gentle, the strength of the cutting edge more consistent, and the cutting stability better, thereby reducing the risk of chipping and vibration when the form milling cutter 100 mills the workpiece. At the same time, by adding an axial plane 14 at the step, the cutting edge strength at the step is strengthened, solving the problem of weak cutting edge strength at the step and avoiding the problem of cross-grain caused by chipping due to weak cutting edge.
[0058] Furthermore, those skilled in the art should recognize that the above embodiments are merely illustrative of this application and are not intended to limit this application. Any appropriate changes and variations made to the above embodiments within the essential spirit and scope of this application fall within the scope of this application's disclosure.
Claims
1. A forming milling cutter for cutting stepped surfaces, the forming milling cutter comprising a shank and a cutting head connected to and located at one end of the shank, the cutting head comprising a first section and a second section disposed along the axial direction of the forming milling cutter, the first section being located between the shank and the second section, characterized in that, The first segment includes a first groove arranged in a spiral, and the second segment includes a second groove arranged in a spiral. The first groove and the second groove are connected, and the spiral angle of the first groove is different from that of the second groove.
2. The forming milling cutter according to claim 1, characterized in that, The first groove has a helix angle of δ1, and the second groove has a helix angle of δ2, where δ1 > δ2.
3. The forming milling cutter according to claim 2, characterized in that, δ1=35°-40°, δ2=20°-30°.
4. The forming milling cutter according to claim 1, characterized in that, The first segment further includes a spirally arranged first cutting edge, which is distributed adjacent to the first groove. The second segment further includes a second cutting edge, which is distributed adjacent to the second groove. The radial rake angle of the first cutting edge is γ1, and the radial rake angle of the second cutting edge is γ2, where 0°≤|γ1-γ2| ≤4°.
5. The forming milling cutter according to claim 4, characterized in that, γ1=6°-10°, γ2=6°-10°.
6. The forming milling cutter according to claim 4, characterized in that, The cutter head also includes a third cutting edge arranged radially along the forming milling cutter, the third cutting edge being located at the junction of the first groove and the second groove; One end of the third cutting edge is connected to the first cutting edge, and the other end of the third cutting edge is connected to the second cutting edge; the rake face of the third cutting edge is provided with an axial plane, and the axial plane is distributed along the axial direction of the forming milling cutter.
7. The forming milling cutter according to claim 6, characterized in that, The extension length of the axial plane that connects with the second groove is Ls, where Ls ≥ 0.2 mm.
8. The forming milling cutter according to claim 6, characterized in that, The width of the narrowest point where the rake face of the third cutting edge meets the first groove ranges from 0.04mm to 0.09mm.
9. The forming milling cutter according to any one of claims 6 to 8, characterized in that, In the first cutting edge, the first radial clearance angle is 12° and the second radial clearance angle is 25°; in the second cutting edge, the first radial clearance angle is 12° and the second radial clearance angle is 25°; in the third cutting edge, the first radial clearance angle is 12° and the second radial clearance angle is 25°.
10. The forming milling cutter according to claim 6, characterized in that, In the third cutting edge, the value range of the first axial clearance angle is 8°~10°, and the value range of the second axial clearance angle is 14°~16°.