Milling cutter and milling assembly for ear orifice rounding
By setting fillet sections of different heights and a clearance rod structure on the milling cutter, the problem of multiple tool changes and multiple toolpaths required for rounding the corners of the ear holes in the existing technology is solved, realizing efficient and low-cost machining of double ear holes, and improving machining efficiency and surface finish.
Patent Information
- Application Number
- CN202520350949.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-03
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-03-03
AI Technical Summary
In existing technologies, the rounding of the ear plate holes requires multiple tool changes and multiple toolpaths, resulting in low efficiency and high cost, which makes it difficult to meet the needs of mass production and high efficiency of civil aircraft products.
Design a milling cutter that simultaneously rounds the inner and outer corners by setting a first rounded section and a second rounded section at different heights on the cutter body, thereby reducing the tool path. Multiple milling sections and a clearance rod structure are used to improve stability and strength.
The rounding of a pair of double-ear holes requires only two tool paths, which improves machining efficiency by 61%, reduces costs, and ensures the surface finish and part quality stability.
Smart Images
Figure CN223833534U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of milling tooling technology, and more specifically, to a milling cutter and milling assembly for rounding the opening of an ear plate. Background Technology
[0002] Double-eared holes are often encountered in CNC machining (such as...) Figure 1 As shown), the tolerance of the lug hole is very small (generally H7 or H8). Generally, for the rounding of the outer side of the lug, a round nose cutter is used for stringing; for the rounding of the inner side of the lug, a T-shaped cutter is used for stringing. However, for civil aircraft products, large batches, low prices, and low profits mean that every second counts in the production process; efficient and high-quality processing is key to profitability.
[0003] In the related technology, the milling fixture requires two tool changes (one with a chamfering tool and the other with a dovetail chamfering tool) to machine the four chamfers on both sides of a pair of double-eared holes. Machining one radius corner requires cutting four toolpaths, taking approximately 16 seconds. Assuming that the machine tool takes 6 seconds to change tools once, the traditional machining method would take 6*2 + 16*4 = 76 seconds to machine one double-eared hole.
[0004] Therefore, a new milling cutter and milling assembly are needed for rounding the ear hole opening. Utility Model Content
[0005] The purpose of this application is to provide a milling cutter and milling assembly for rounding the opening of a lug hole. By setting a first fillet segment and a second fillet segment at different heights along the extension direction of the cutter body, the milling cutter can be used to process both the outer and inner fillets of the lug hole. As a dedicated tool, a pair of double lug holes only requires two tool paths, eliminating the need for multiple tool paths for stringing, achieving a single cut and higher surface finish.
[0006] The embodiments of this application are implemented as follows:
[0007] This application provides a milling cutter for rounding the opening of an ear plate hole, comprising:
[0008] Blade body;
[0009] A milling unit includes a plurality of milling sections, at least one of the milling sections being connected to the tool body, and the milling section having a first rounded corner segment and a second rounded corner segment;
[0010] The first rounded corner segment and the second rounded corner segment are arranged at different heights of the milling part along the extension direction of the cutter body, so as to be used for inner rounding and outer rounding respectively.
[0011] In some embodiments of this application, the milling portion has a columnar structure, with the first rounded corner segment located on the upper end face of the milling portion and the second rounded corner segment located on the lower end face of the milling portion.
[0012] In some embodiments of this application, the number of milling portions is multiple, and the multiple milling portions are arranged at intervals along the extension direction of the cutter body.
[0013] In some embodiments of this application, the milling unit further includes a plurality of clearance rods; at least one of the milling parts is connected to the cutter body through the clearance rods, and the clearance rods are located between two adjacent milling parts.
[0014] In some embodiments of this application, both the clearance rod and the blade body are rod-shaped structures, and the aperture of the clearance rod is smaller than the aperture of the blade body, with a chamfered transition at the connection between the clearance rod and the blade body.
[0015] In some embodiments of this application, the diameter of the small-diameter end of the milling part is larger than the diameter of the hole of the clearance rod, and the connection between the milling part and the clearance rod is rounded.
[0016] In some embodiments of this application, the chamfer at the connection between the air-blocking rod and the blade body is 60°.
[0017] In some embodiments of this application, the radius of the first rounded corner segment in the cross-section and the radius of the second rounded corner segment in the cross-section are both greater than 90°.
[0018] In some embodiments of this application, the radius of the first rounded corner segment in the cross-section and the radius of the second rounded corner segment in the cross-section are both 100°.
[0019] This application also provides a milling assembly, including a milling cutter as described above for rounding the ear hole opening.
[0020] The milling cutter for rounding the ear hole provided in this application embodiment has at least the following beneficial effects, including but not limited to:
[0021] 1) The fillet machining in related technologies requires multiple toolpaths, while this milling cutter can achieve fillet machining of the inner and outer corners by setting the first fillet segment and the second fillet segment at different heights. Therefore, when it is suitable for a pair of double lug holes, it only requires two toolpaths to complete the machining, avoiding multiple feeds and tool changes, improving machining efficiency and reducing machining costs.
[0022] 2) The fillet section of this milling cutter is 100°. It takes into account tool error and runout, so that the actual fillet radius R1 obtained by machining can be about R0.95. While meeting the tolerance requirements, it effectively prevents the tool from scratching the ear surface and the side wall of the precision hole during machining, improves the surface finish of the machined surface, and ensures the quality stability of the parts.
[0023] 3) By setting a clearance rod, the milling part is more firmly connected to the cutter body. Furthermore, the connection between the clearance rod and the cutter body is made with a rounded or chamfered transition (such as a 60° chamfer), which reduces stress concentration and improves the overall strength of the tool. Attached Figure Description
[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0025] Figure 1 This is a schematic diagram of the structure of the double-eared hole in the related technology;
[0026] Figure 2 This is a schematic diagram of the structure of a milling cutter for rounding the ear hole provided in an embodiment of this application;
[0027] Figure 3 One of the machining schematic diagrams for a milling cutter used for rounding the ear hole provided in the embodiments of this application;
[0028] Figure 4 This is the second schematic diagram of the milling cutter used for rounding the ear hole, provided in an embodiment of this application.
[0029] Icons: 100 - Milling cutter for rounding the ear hole opening; 10 - Cutting body; 111 - Milling section; 1111 - First fillet section; 1112 - Second fillet section; 1113 - Clearance bar. Detailed Implementation
[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0031] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0033] In the description of the embodiments of this application, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," or "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing this application 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, and therefore should not be construed as a limitation on this application. In addition, terms such as "first," "second," and "third" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0034] Furthermore, the use of terms such as "horizontal," "vertical," and "sag" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0035] In the description of the embodiments of this application, "a plurality of" means at least two.
[0036] In the description of the embodiments of this application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0037] Figure 2 This is a schematic diagram of the structure of the milling cutter 100 for rounding the ear hole provided in an embodiment of this application;
[0038] Figure 3 This is one of the machining schematic diagrams of the milling cutter 100 for rounding the ear hole provided in the embodiments of this application;
[0039] Figure 4 This is a second schematic diagram illustrating the machining process of the milling cutter 100 used for rounding the ear hole opening, as provided in an embodiment of this application. Figures 2-4 As shown, the milling cutter 100 for rounding the ear hole can include a cutter body 10 and a milling unit. The milling unit includes a plurality of milling sections 111, at least one milling section 111 is connected to the cutter body 10, and the milling section 111 has a first rounded corner section 1111 and a second rounded corner section 1112; wherein the first rounded corner section 1111 and the second rounded corner section 1112 are arranged at different height positions along the extension direction of the cutter body 10, so as to be used for inner rounding and outer rounding respectively.
[0040] It is worth noting that by setting a first rounded corner segment 1111 and a second rounded corner segment 1112 at different heights along the extension direction of the cutter body 10, the milling cutter can be used to process both the outer and inner rounded corners of the lug hole. As a special tool, a pair of double lug holes only requires two tool paths, eliminating the need for multiple tool paths for stringing, and forming the hole in one cut with a higher surface finish.
[0041] Specifically, the time for this milling cutter to process a rounded corner can be optimized to 6 + 7 * 2 = 20 seconds, which is 61% more efficient than related technologies. The effect is even more obvious for mass production.
[0042] In this embodiment, the milling portion 111 has a columnar structure, with the first rounded corner segment 1111 located on the upper end face of the milling portion 111 and the second rounded corner segment 1112 located on the lower end face of the milling portion 111.
[0043] It is worth noting that the milling section 111 has a columnar structure, which has high rigidity and can maintain high stability during machining, reducing the impact of tool deformation under stress. The first fillet segment 1111 and the second fillet segment 1112 are located on the upper and lower end faces of the milling section 111, respectively, making the machining positioning of the inner and outer fillet corners more accurate, ensuring the stability of the fillet corner size and shape, and meeting the accuracy requirements. In addition, this design rationally distributes the working area of the cutting part, so that the first fillet segment 1111 and the second fillet segment 1112 can each undertake machining tasks in different directions, avoiding premature wear caused by prolonged concentrated force on a single cutting edge.
[0044] In this embodiment, there are multiple milling portions 111, which are arranged at intervals along the extension direction of the cutter body 10.
[0045] It is worth noting that this milling cutter, by incorporating multiple milling sections 111, allows for simultaneous cutting, enabling the rounding of multiple locations in a single feed to be completed concurrently, eliminating the need for processing each area individually. This structure significantly reduces machining time, improves production efficiency, and increases the overall machining cycle time, making it suitable for high-efficiency mass production. Furthermore, because multiple milling sections 111 process synchronously, all rounded corners are formed under the same machining conditions (such as feed rate and cutting force), avoiding dimensional errors or consistency deviations that may result from incremental machining. This ensures the uniformity of the rounded corner dimensions and shape, improving the overall product quality.
[0046] Optionally, the milling unit also includes a plurality of clearance rods 1113; at least one milling part 111 is connected to the cutter body 10 through the clearance rods 1113, and there are clearance rods 1113 between two adjacent milling parts 111.
[0047] Specifically, the clearance rod 1113 provides additional space, allowing the chips generated during the cutting process to be discharged more smoothly, preventing chips from accumulating between the milling sections 111, thereby reducing machining instability, surface scratches or dimensional errors caused by chip blockage, and improving machining quality and tool life.
[0048] In this embodiment, both the clearance rod 1113 and the cutter body 10 are rod-shaped structures, and the aperture of the clearance rod 1113 is smaller than the aperture of the cutter body 10. The connection between the clearance rod 1113 and the cutter body 10 is chamfered.
[0049] It is worth noting that the diameter of the hole in the cutter body 10 in this embodiment can be 10mm, and the diameter of the hole in the relief rod 1113 can be 7mm. By chamfering the transition at the connection between the relief rod 1113 and the cutter body 10, a certain transition area can be formed, and the stress concentration at the connection can be reduced. This effectively reduces the risk of tool breakage due to stress concentration during high-speed rotation and cutting, and improves the service life of the tool.
[0050] Optionally, the chamfer at the connection between the clearance rod 1113 and the cutter body 10 is 60°.
[0051] Depending on the specific implementation environment, the chamfer at the connection between the air-avoiding rod 1113 and the blade body 10 can be 70°, 80°, etc. This embodiment does not constitute a limitation on the specific angle of the chamfer, but is only an example of the angle.
[0052] Please refer to this again. Figure 2 The diameter of the small diameter end of the milling part 111 is larger than the hole diameter of the clearance rod 1113, and the connection between the milling part 111 and the clearance rod 1113 is rounded.
[0053] It is worth noting that since the small-diameter end diameter of the milling section 111 is larger than the hole diameter of the clearance rod 1113, a stepped transition structure is formed. This design provides better support and reduces deformation during machining. Simultaneously, the rounded corner transition effectively reduces stress concentration, making the connection area more fatigue-resistant and improving the overall strength and durability of the tool. Furthermore, using a rounded corner transition instead of a right-angle transition allows the cutting force to gradually transition within the tool, reducing excessive local stress caused by sudden changes, thereby reducing tool vibration and improving machining stability. In addition, as shown in the figure, this rounded corner is smaller than the first rounded corner segment 1111 and the second rounded corner segment 1112, and it does not affect the main rounded corner machining shape, ensuring machining accuracy and consistency.
[0054] In this embodiment, the radius of curvature of the first rounded corner segment 1111 in the cross-section and the radius of curvature of the second rounded corner segment 1112 in the cross-section are both greater than 90°.
[0055] Optionally, the radius of curvature of the first rounded corner segment 1111 in the cross-section and the radius of curvature of the second rounded corner segment 1112 in the cross-section are both 100°.
[0056] Specifically, the fillet section of this milling cutter is 100°, taking into account tool error and runout. This allows the actual fillet radius R1 obtained to be approximately R0.95. While meeting tolerance requirements, it effectively prevents the tool from scratching the ear surface and the sidewall of the precision hole during machining, improving the surface finish and ensuring the quality stability of the parts.
[0057] This embodiment also provides a milling assembly, including a milling cutter 100 for rounding the ear hole as described above, which has all its beneficial effects.
[0058] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.
Claims
1. A milling cutter for rounding the opening of an ear plate hole, characterized in that, include: Blade body; A milling unit includes a plurality of milling sections, at least one of the milling sections being connected to the tool body, and the milling section having a first rounded corner segment and a second rounded corner segment; The first rounded corner segment and the second rounded corner segment are arranged at different heights of the milling part along the extension direction of the cutter body, so as to be used for inner rounding and outer rounding respectively.
2. The milling cutter for rounding the opening of an ear plate according to claim 1, characterized in that, The milling section has a columnar structure, with the first rounded corner segment located on the upper end face of the milling section and the second rounded corner segment located on the lower end face of the milling section.
3. The milling cutter for rounding the opening of an ear piece according to claim 1, characterized in that, The number of milling sections is multiple, and the multiple milling sections are arranged at intervals along the extension direction of the cutter body.
4. The milling cutter for rounding the opening of an ear piece according to claim 3, characterized in that, The milling unit also includes multiple clearance rods; at least one of the milling parts is connected to the cutter body through the clearance rods, and the clearance rods are located between two adjacent milling parts.
5. The milling cutter for rounding the opening of an ear piece according to claim 4, characterized in that, Both the clearance rod and the blade body are rod-shaped structures, and the aperture of the clearance rod is smaller than that of the blade body. The connection between the clearance rod and the blade body is chamfered.
6. The milling cutter for rounding the opening of an ear piece according to claim 4, characterized in that, The diameter of the small-diameter end of the milling part is larger than the diameter of the hole of the clearance rod, and the connection between the milling part and the clearance rod is rounded.
7. The milling cutter for rounding the opening of an ear piece according to claim 4, characterized in that, The chamfer at the connection between the air-avoiding rod and the blade body is 60°.
8. The milling cutter for rounding the opening of an ear piece according to claim 1, characterized in that, The radius of the first rounded corner segment in the cross-section and the radius of the second rounded corner segment in the cross-section are both greater than 90°.
9. The milling cutter for rounding the opening of an ear plate according to claim 1, characterized in that, The radius of the first rounded corner segment in the cross-section and the radius of the second rounded corner segment in the cross-section are both 100°.
10. A milling assembly, characterized in that, Includes the milling cutter as described in any one of claims 1-9.