Milling cutter and milling assembly for lug orifice chamfering
By designing milling cutters with chamfered sections of different heights, the problem of needing to change tools multiple times to machine the chamfer of the lug holes was solved, achieving efficient and low-cost machining of double lug holes, which is suitable for the efficient production of civil aircraft products.
Patent Information
- Application Number
- CN202520352122.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-03
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2035-03-03
AI Technical Summary
In existing technologies, the chamfering of ear plate holes requires multiple tool changes, 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 comprising a first chamfer section and a second chamfer section located at different heights along the extension direction of the cutter body, for simultaneously machining the inner and outer chamfers of the lug hole, reducing toolpath and improving machining efficiency.
Machining a pair of double-ear holes requires only two toolpaths, increasing machining efficiency by 50%, reducing costs, and improving machining quality and continuity.
Smart Images
Figure CN223932677U_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 chamfering 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-ear holes, requiring four similar toolpaths. Assuming that the machine tool takes 6 seconds to change tools once, and the machining time for one chamfer is 7 seconds, the traditional machining method would take 6*2 + 7*4 = 40 seconds to machine one double-ear hole.
[0004] Therefore, a new milling cutter and milling assembly are needed for chamfering the ear hole opening. Utility Model Content
[0005] The purpose of this application is to provide a milling cutter and milling assembly for chamfering the opening of a lug hole. By setting a first chamfering section and a second chamfering section at different heights along the extension direction of the cutter body, the milling cutter can be used to process both the outer chamfer and the inner chamfer 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, forming the hole in one cut, and achieving a higher surface finish.
[0006] The embodiments of this application are implemented as follows:
[0007] This application provides a milling cutter for chamfering the opening of an ear plate, 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 chamfer section and a second chamfer section;
[0010] The first chamfered section and the second chamfered section 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 conical structure, with the first chamfered segment located on the upper end face of the milling portion and the second chamfered segment located on the lower end face of the milling portion.
[0012] In some embodiments of this application, the first chamfered segment and the second chamfered segment are directly connected.
[0013] 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.
[0014] 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.
[0015] 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.
[0016] In some embodiments of this application, the diameter of the small-diameter end of the milled portion is the same as the diameter of the hole in the clearance rod.
[0017] In some embodiments of this application, the chamfer at the connection between the air-blocking rod and the blade body is 60°.
[0018] In some embodiments of this application, the chamfer angle of the first chamfer segment in the cross-section and the chamfer angle of the second chamfer segment in the cross-section are both 45°.
[0019] This application also provides a milling assembly, including a milling cutter for chamfering the ear hole as described above.
[0020] The milling cutter for chamfering ear hole openings provided in this application embodiment has at least the following beneficial effects, including but not limited to:
[0021] 1) Chamfering in related technologies requires multiple toolpaths, while this milling cutter can achieve the machining of inner and outer chamfers by setting the first chamfering section and the second chamfering section 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 first chamfer section and the second chamfer section of this milling cutter are directly connected, avoiding the steps or gaps in the intermediate transition area, making the chamfer transition smoother and improving the machining quality. It can reduce the need for tool changing or secondary machining, improve the continuity and consistency of machining, and help improve production efficiency.
[0023] 3) By setting a clearance rod, the milling part is more firmly connected to the cutter body, and the connection between the clearance rod and the cutter body is chamfered (such as a 60° chamfer), which reduces stress concentration and improves the overall strength of the cutter. 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 chamfering 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 chamfering 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 chamfering the ear hole provided in the embodiments of this application.
[0029] Icons: 100 - Milling cutter for chamfering the ear hole opening; 10 - Cutting body; 111 - Milling section; 1111 - First chamfering section; 1112 - Second chamfering 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 chamfering 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 chamfering the ear hole provided in the embodiments of this application;
[0039] Figure 4 This is a second schematic diagram illustrating the machining of the milling cutter 100 for chamfering the ear hole opening, as provided in an embodiment of this application. Figures 2-4As shown, the milling cutter 100 for chamfering 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 chamfering section 1111 and a second chamfering section 1112; wherein the first chamfering section 1111 and the second chamfering 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 chamfering section 1111 and a second chamfering section 1112 at different heights along the extension direction of the cutter body 10, the milling cutter can be used to process both the outer chamfer of the lug hole and the inner chamfer 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 shape in one cut with a higher surface finish.
[0041] Specifically, the time for this milling cutter to process a chamfer is optimized to 6 + 7 * 2 = 20 seconds, improving efficiency by 50%. The effect is even more significant for mass production.
[0042] In this embodiment, the milling portion 111 has a conical structure, with the first chamfered segment 1111 located on the upper end face of the milling portion 111 and the second chamfered 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 conical structure, which has high rigidity and can maintain high stability during machining, reducing the impact of tool deformation under stress. The first chamfer section 1111 and the second chamfer section 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 chamfers more accurate, ensuring the stability of the chamfer size and shape, and meeting the precision requirements. In addition, this design rationally distributes the working area of the cutting part, so that the first chamfer section 1111 and the second chamfer section 1112 can each undertake machining tasks in different directions, avoiding premature wear caused by prolonged concentrated stress on a single cutting edge.
[0044] In this embodiment, the first chamfered segment and the second chamfered segment are directly connected.
[0045] It is worth noting that this connection method can avoid steps or gaps in the intermediate transition area, making the chamfer transition smoother and improving the processing quality.
[0046] In this embodiment, there are multiple milling portions 111, which are arranged at intervals along the extension direction of the cutter body 10.
[0047] It is worth noting that this milling cutter, by incorporating multiple milling sections 111, allows for simultaneous cutting, enabling the completion of chamfering at multiple locations in a single feed, 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 chamfered areas 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 chamfer dimensions and shape, improving the overall product quality.
[0048] Optionally, the milling unit also includes a plurality of clearance rods 1113; at least one milling part 111 is connected to the tool body 10 through the clearance rods 1113, and there are clearance rods 1113 between two adjacent milling parts 111.
[0049] 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.
[0050] 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.
[0051] 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.
[0052] Optionally, the chamfer at the connection between the clearance rod 1113 and the cutter body 10 is 60°.
[0053] 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.
[0054] Please refer to this again. Figure 2 The diameter of the small-diameter end of the milling part 111 is equal to the diameter of the hole in the clearance rod 1113.
[0055] It is worth noting that, because the small-diameter end matches the bore diameter of the clearance rod, the milling cutter can be precisely positioned at the bore opening, avoiding wobbling or offset caused by excessive clearance, thus improving the accuracy and consistency of chamfering. Furthermore, the matching dimensions ensure that the milling section fits tightly against the workpiece when entering the bore opening, reducing potential runout or vibration during cutting, thereby improving the surface finish of the machined surface.
[0056] In this embodiment, the chamfer angle of the first chamfer segment 1111 and the chamfer angle of the second chamfer segment 1112 in the cross-section are both 45°.
[0057] This embodiment also provides a milling assembly, including a milling cutter 100 for chamfering 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 chamfering 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 chamfer section and a second chamfer section; The first chamfered segment and the second chamfered 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 chamfering the opening of an ear piece according to claim 1, characterized in that, The milling section has a conical structure, with the first chamfered section located on the upper end face of the milling section and the second chamfered section located on the lower end face of the milling section.
3. The milling cutter for chamfering the opening of an ear piece according to claim 2, characterized in that, The first chamfered segment is directly connected to the second chamfered segment.
4. The milling cutter for chamfering 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.
5. The milling cutter for chamfering the opening of an ear piece according to claim 4, 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.
6. The milling cutter for chamfering the opening of an ear piece according to claim 5, 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.
7. The milling cutter for chamfering the opening of an ear piece according to claim 5, characterized in that, The diameter of the small-diameter end of the milling section is the same as the diameter of the hole in the clearance rod.
8. The milling cutter for chamfering the opening of an ear piece according to claim 6, characterized in that, The chamfer at the connection between the air-avoiding rod and the blade body is 60°.
9. The milling cutter for chamfering the opening of an ear piece according to claim 1, characterized in that, The chamfer angle of the first chamfer segment in the cross-section and the chamfer angle of the second chamfer segment in the cross-section are both 45°.
10. A milling assembly, characterized in that, Includes the milling cutter as described in any one of claims 1-9.