A tool for machining a profiled hole and a diffuser

Abstract

This utility model belongs to the field of aero-engine machining technology and discloses a lathe tool and diffuser for machining irregularly shaped holes. The lathe tool for machining irregularly shaped holes, used to machine a workpiece with a gradually expanding inner wall, includes a cutting tool and an insert. The cutting tool includes a connected shank portion and an insert portion at an included angle. A first and second side of the insert portion connected to the shank are inclined outwards from bottom to top, forming opposing first and second inclined surfaces. The portion of the insert portion away from the shank avoids this outward inclination, forming a third inclined surface. The insert is fixed to the end of the insert portion away from the shank. The lathe tool and diffuser provided by this utility model for machining irregularly shaped holes can prevent interference between the cutting tool and the gradually expanding inner wall of the workpiece, suppress vibrations caused by vibrations during machining, and improve the machining quality of the gradually expanding inner wall and the lifespan of the cutting tool.

Description

Technical Field

[0001] This utility model relates to the field of aero-engine machining technology, and in particular to a lathe tool and diffuser for machining irregular holes. Background Technology

[0002] In aero engines, the diffuser is a crucial structure. It restores the dynamic pressure of the high-speed airflow at the compressor outlet to static pressure, improves airflow distribution, reduces airflow separation, and enhances combustion stability and efficiency. Conventional diffusers have streamlined, gradually expanding channels and abruptly expanding channels on their inner walls. These inner walls need to be machined using a cutting tool. However, due to the shape limitations of the diffuser's inner wall, the machined inner wall often exceeds the tool's machining range, resulting in low machining efficiency.

[0003] Among the related technologies, there is a machining tool for aerospace parts. Although it can machine the inner wall surface of deep holes, it cannot machine reaming holes. During the machining process, the cutting tool or insert interferes with the inner wall of the reaming hole, affecting the machining efficiency and the machining quality and efficiency of the inner wall of the reaming hole. Utility Model Content

[0004] The purpose of this invention is to provide a lathe tool and diffuser for machining irregular holes. It can prevent interference between the lathe tool and the expanding inner wall of the workpiece, change the flow direction of chips during machining, optimize the stiffness distribution of the cutting edge, change the natural frequency of the cutting edge, suppress vibration of the lathe tool caused by vibration during machining, and improve the machining quality, machining efficiency, and tool life of the expanding inner wall.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] Lathe tools for machining irregularly shaped holes, and workpieces for machining gradually expanding inner walls, including:

[0007] A lathe tool, comprising a shank portion and a cutting blade portion connected together, wherein the shank portion and the cutting blade portion are arranged at an angle, wherein a first side of the cutting blade portion connected to the shank portion is inclined outward from bottom to top to form a first inclined surface, and a second side of the cutting blade portion connected to the shank portion is inclined outward from bottom to top to form a second inclined surface, wherein the first inclined surface and the second inclined surface are arranged opposite to each other along the extending direction of the shank portion, and a portion of the bottom surface of the cutting blade portion away from the shank portion along the extending direction of the cutting blade portion is inclined outward from bottom to top to form a third inclined surface;

[0008] The blade is fixedly connected to the end of the blade portion away from the handle portion.

[0009] Preferably, the inclination angle b between the first inclined surface and the vertical direction is 3°-7°.

[0010] Preferably, the inclination angle α between the third inclined surface and the horizontal direction is 45°-55°.

[0011] Preferably, the turning tool for machining irregular holes further includes:

[0012] A clamping member, one end of which is fixedly connected to the blade portion, and the other end of which can simultaneously abut against the blade portion and part of the upper surface of the blade.

[0013] Preferably, the blade portion has an inclined protrusion formed on its upper surface in the vertical direction, the upper surface of the inclined protrusion is inclined toward one side of the blade, and the other end of the clamping member can abut against a portion of the upper surface of the inclined protrusion.

[0014] Preferably, the turning tool for machining irregular holes further includes:

[0015] A fixing member is provided, wherein the blade is fixedly connected to the end of the blade portion away from the handle portion via the fixing member.

[0016] Preferably, the length D2 of the blade portion is 39mm-40mm.

[0017] Preferably, the handle portion and the blade portion are integrally formed and connected.

[0018] Preferably, both the handle and the blade are made of 40CrMoA material.

[0019] A diffuser, the inner wall of which is machined by a lathe tool as described above for machining irregular holes.

[0020] The beneficial effects of this utility model are:

[0021] This utility model provides a lathe tool and diffuser for machining irregular holes. The lathe tool is used to machine a workpiece with a gradually expanding inner wall, and includes a lathe tool and an insert. The lathe tool includes a tool holder and an insert connected together. The tool holder and the insert are set at an angle. The first side of the insert connected to the tool holder is inclined outward from bottom to top to form a first inclined surface. The second side of the insert connected to the tool holder is inclined outward from bottom to top to form a second inclined surface. The first inclined surface and the second inclined surface are arranged opposite to each other along the extension direction of the tool holder. The bottom surface of the insert away from the tool holder along the extension direction of the insert is inclined outward from bottom to top to form a third inclined surface. The insert can be fixedly connected to the end of the insert away from the tool holder. By setting the first, second, and third inclined surfaces on the cutting tool, interference between the cutting tool and the expanding inner wall of the workpiece can be avoided. At the same time, the flow direction of chips during the machining process can be changed, the stiffness distribution of the cutting tool can be optimized, the natural frequency of the cutting tool can be changed, the vibration of the cutting tool caused by vibration during the machining process can be suppressed, and the machining quality, machining efficiency, and cutting tool life of the expanding inner wall can be improved. Attached Figure Description

[0022] Figure 1 This is an isometric view of a lathe tool for machining irregular holes provided in this embodiment of the present invention;

[0023] Figure 2 This is a top view of a lathe tool for machining irregular holes provided in an embodiment of this utility model;

[0024] Figure 3 This is a side view of a lathe tool for machining irregular holes provided in an embodiment of the present invention;

[0025] Figure 4 This is a cross-sectional view of a lathe tool for machining irregular holes provided in an embodiment of this utility model;

[0026] Figure 5 yes Figure 4 A magnified view of a portion of point A in the middle.

[0027] In the picture:

[0028] 1. Lathe tool; 11. Tool holder; 12. Blade; 121. First inclined surface; 122. Second inclined surface; 123. Third inclined surface; 124. Arc surface; 125. Inclined protrusion; 2. Clamping component; 3. Blade; 4. Fixing component. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0030] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0033] This embodiment provides a turning tool for machining irregularly shaped holes, such as... Figures 1-3As shown, a workpiece for machining a gradually expanding inner wall includes a lathe tool 1 and an insert 3. The lathe tool 1 includes a tool holder 11 and an insert 12 connected together. The tool holder 11 and the insert 12 are set at an angle. The first side of the insert 12 connected to the tool holder 11 is inclined outward from bottom to top to form a first inclined surface 121. The second side of the insert 12 connected to the tool holder 11 is inclined outward from bottom to top to form a second inclined surface 122. The first inclined surface 121 and the second inclined surface 122 are arranged opposite to each other along the extension direction of the tool holder 11. The bottom surface of the insert 12, which is away from the tool holder 11 along the extension direction of the insert 12, is inclined outward from bottom to top to form a third inclined surface 123. The insert 3 can be fixedly connected to the end of the insert 12 away from the tool holder 11.

[0034] By setting the first inclined surface 121, the second inclined surface 122, and the third inclined surface 123 on the cutting tool 12, interference between the cutting tool 1 and the expanding inner wall of the workpiece can be avoided. Simultaneously, the flow direction of chips during machining can be changed, optimizing the stiffness distribution of the cutting tool 12, altering the natural frequency of the cutting tool 12, and suppressing vibration of the cutting tool 1 caused by vibration during machining. This improves the machining quality, machining efficiency, and lifespan of the expanding inner wall. It should be noted that in this embodiment, the workpiece to be machined for the expanding inner wall is an aero-engine diffuser. In other embodiments, the workpiece to be machined for the expanding inner wall can also be a horn, etc. No limitation is made here.

[0035] Specifically, such as Figure 1 As shown, in this embodiment, the insert 3 is an R6 milling insert. In other embodiments, the insert 3 can also be a parallelogram-shaped milling insert, etc. No limitation is made here.

[0036] Specifically, in this embodiment, the handle portion 11 and the blade portion 12 are made of 40CrMoA material. 40CrMoA is an ultra-high strength steel with excellent strength and toughness. In other embodiments, the handle portion 11 and the blade portion 12 may also be made of 40CrMo material, or they may also be made of high-speed steel, etc. No limitations are imposed here.

[0037] Optionally, in this embodiment, as Figure 1 As shown, the cutting blade portion 12 is perpendicularly connected to the tool holder portion 11. This perpendicular connection reduces energy loss during machining and improves machining accuracy and stability. In other embodiments, the included angle between the cutting blade portion 12 and the tool holder portion 11 can be acute or obtuse, etc. No limitation is imposed here.

[0038] Specifically, such as Figure 1 and Figure 2 As shown, in this embodiment, the handle portion 11 has a square columnar structure. In other embodiments, the handle portion 11 may also be cylindrical, etc. No limitation is made here.

[0039] More specifically, such as Figure 2 As shown, the width D3 of the handle portion 11 can be 20mm-30mm. In this embodiment, the width D3 of the handle portion 11 is 25mm. In other embodiments, the width D3 of the handle portion 11 can be 21mm, 22mm, 23mm, 24mm, 26mm, 27mm, 28mm, 29mm, or 30mm. No limitation is imposed here.

[0040] More specifically, such as Figure 2 As shown, the extension length D1 of the tool holder 11 can be 140mm-145mm. In this embodiment, the extension length D1 of the tool holder 11 is 141.5mm. This can adapt to the gradually expanding inner bore wall of an aero-engine diffuser. In other embodiments, the extension length D1 of the tool holder 11 can be 140mm, 141mm, 142mm, 142.5mm, 143.5mm, 144mm, or 145mm. No limitation is imposed here.

[0041] Optionally, in this embodiment, as Figure 2 As shown, the transition joint between the tool holder 11 and the cutting edge 12 is rounded. This rounding transforms concentrated loads into distributed loads, reducing stress concentration at the transition joint and preventing deformation or breakage of the cutting edge 12 due to stress concentration, thus extending the life of the cutting tool 1. In other embodiments, reinforcing ribs or thickening treatments may be provided at the transition joint between the tool holder 11 and the cutting edge 12. No limitations are imposed here; the goal is simply to reduce stress concentration at the connection between the cutting edge 12 and the tool holder 11.

[0042] Optionally, in this embodiment, as Figure 2 As shown, the radius R1 of the outer fillet at the transition joint between the handle portion 11 and the blade portion 12 can be 2mm-8mm. In this embodiment, the radius R1 of the outer fillet at the transition joint between the handle portion 11 and the blade portion 12 is 5mm. In other embodiments, the radius R1 of the outer fillet at the transition joint between the handle portion 11 and the blade portion 12 can also be 2mm, 3mm, 4mm, 6mm, 7mm, or 8mm. No limitation is imposed here.

[0043] Optionally, in this embodiment, as Figure 2As shown, the radius R2 of the inner fillet at the transition joint between the shank portion 11 and the blade portion 12 can be 0.5mm-3mm. In this embodiment, the radius R2 of the inner fillet at the transition joint between the shank portion 11 and the blade portion 12 is 2mm. In other embodiments, the radius R2 of the inner fillet at the transition joint between the shank portion 11 and the blade portion 12 can also be 0.5mm, 1mm, 1.5mm, 2.5mm, or 3mm. No limitation is imposed here.

[0044] Optionally, such as Figure 1 As shown, in this embodiment, the shank portion 11 and the blade portion 12 are integrally formed and connected. This integral connection improves the consistency between the shank portion 11 and the blade portion 12, and eliminates any noticeable seams, resulting in a more uniform overall structure for the lathe tool 1. In other embodiments, the shank portion 11 and the blade portion 12 can also be welded together, etc. No limitations are imposed here.

[0045] Optionally, such as Figure 3 As shown, the inclination angle b between the first inclined surface 121 and the vertical direction is 3°-7°. In this embodiment, the inclination angle b between the first inclined surface 121 and the vertical direction can be 3°, 4°, 5°, 6° or 7°, and is preferably 4° in this embodiment. This can further optimize the flow direction of the chips. In other embodiments, the inclination angle b between the first inclined surface 121 and the vertical direction is not limited.

[0046] Further optional, such as Figure 3 As shown, the inclination angle c between the second inclined surface 122 and the vertical direction is 3°-7°. In this embodiment, the inclination angle c between the second inclined surface 122 and the vertical direction can be 3°, 4°, 5°, 6° or 7°, and is preferably 4° in this embodiment. In other embodiments, the inclination angle c between the second inclined surface 122 and the vertical direction is not limited.

[0047] Specifically, in this embodiment, the tilt angle b between the first inclined surface 121 and the vertical direction is the same as the tilt angle c between the second inclined surface 122 and the vertical direction. The same tilt angles b and c make the structure of the blade part 12 symmetrical and the force uniform, which simplifies the manufacturing process of the blade part 12 and reduces the manufacturing difficulty of the blade part 12.

[0048] Optionally, such as Figure 4As shown, the inclination angle α between the third inclined surface 123 and the horizontal direction is 45°-55°. In this embodiment, the inclination angle α between the third inclined surface 123 and the horizontal direction can be 45°, 46°, 47°, 48°, 49°, 50°, 51°, 52°, 53°, 54°, or 55°. In this embodiment, 50° is preferred. This avoids the wall surface of the gradually expanding inner wall of the aero-engine diffuser, preventing interference during processing. In other embodiments, the inclination angle α between the third inclined surface 123 and the horizontal direction is not limited.

[0049] Optionally, such as Figures 1-4 As shown, in this embodiment, an arc surface 124 is provided at the intersection of the first inclined surface 121 and the second inclined surface 122 on the side away from the tool holder 11 along the extending direction of the blade portion 12. The first inclined surface 121, the arc surface 124, and the second inclined surface 122 are connected in sequence to form a U-shaped structure. The arc surface 124 transforms the concentrated load of the contact portion between the blade portion 12 and the blade 3 into a distributed load during machining, reducing the local stress at the end of the blade portion 12 and preventing deformation or breakage of the end of the blade portion 12 due to stress concentration.

[0050] Specifically, such as Figure 4 As shown, in this embodiment, a portion of the lower edge of the blade 3 coincides with the upper edge of the arc surface 124. This arrangement ensures a tight fit between the blade 3 and the blade portion 12 during assembly, while also enhancing the strength and stability of the connection by coinciding the edges.

[0051] Optionally, such as Figure 1 and Figure 4 As shown, the lathe tool for machining irregular holes also includes a retainer 4, and the insert 3 is fixedly connected to the end of the insert portion 12 away from the tool holder portion 11 via the retainer 4. The retainer 4 ensures that the insert 3 will not loosen or fall off during use, guaranteeing safety and stability.

[0052] Specifically, in this embodiment, the fastener 4 is an M4 bolt. In other embodiments, the fastener 4 can also be an M5 bolt, a pin, or a rivet, etc. No limitation is made here.

[0053] Optionally, such as Figure 1 , Figure 4 and Figure 5 As shown, the lathe tool for machining irregular holes also includes a clamping member 2. One end of the clamping member 2 is fixedly connected to the insert portion 12, and the other end of the clamping member 2 can simultaneously abut against the upper surface of both the insert portion 12 and part of the insert 3. This configuration clamps the insert 3 from its upper surface, thereby increasing the friction between the clamping member 2 and the upper surface of the insert 3, further ensuring the connection strength between the insert 3 and the insert portion 12, and enabling it to support high-intensity cutting.

[0054] Specifically, such as Figure 4 and Figure 5 As shown, the blade portion 12 has an inclined protrusion 125 formed on its upper surface in the vertical direction. The upper surface of the inclined protrusion 125 is inclined towards one side of the blade 3, and the other end of the clamping member 2 can abut against the upper surface of the inclined protrusion 125. The inclined protrusion 125 serves as a support surface for the clamping member 2. By utilizing the principle of inclined wedge clamping, the axial force of the clamping member 2 is converted into a normal locking force, which enhances the fixing rigidity of the blade 3 and prevents loosening during cutting.

[0055] More specifically, such as Figure 5 As shown, in this embodiment, the tilt angle d between the inclined protrusion 125 and the horizontal direction is 3°-5°. It can be 3°, 4° or 5°, and 4° is preferred in this embodiment. Since the upper surface of the blade 3 tilts downward at an angle of 4° from the edge to the axis, setting the tilt angle d between the inclined protrusion 125 and the horizontal direction to 4° ensures that both are the same, thereby ensuring the axial and radial positional accuracy of the blade 3 during installation, fixing the cutting angle, and guaranteeing cutting performance.

[0056] Optionally, such as Figure 4 As shown, the extension length D2 of the blade portion 12 is 35mm-45mm. In this embodiment, the extension length D2 of the blade portion 12 can be 35mm, 35.5mm, 36.5mm, 37mm, 38mm, 39mm, 40mm, 41.5mm, 42.5mm, 43mm, or 45mm. In this embodiment, the extension length D2 of the blade portion 12 is preferably 39.5mm. In other embodiments, the extension length D2 of the blade portion 12 is not limited.

[0057] This embodiment also provides a diffuser, the inner wall of which is machined by a lathe tool used for machining irregular holes. By using this lathe tool for machining irregular holes to machine the inner wall of the diffuser, interference between the lathe tool 1 and the gradually expanding inner wall of the workpiece can be avoided. At the same time, the flow direction of chips during the machining process can be changed, the stiffness distribution of the insert portion 12 can be optimized, the natural frequency of the insert portion 12 can be changed, the vibration of the lathe tool 1 caused by vibration during the machining process can be suppressed, and the machining quality, machining efficiency and tool life of the gradually expanding inner wall can be improved.

[0058] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A lathe tool for machining irregularly shaped holes, used for machining workpieces with gradually expanding inner walls, characterized in that, include: A lathe tool (1) includes a shank portion (11) and a cutting blade portion (12) connected together. The shank portion (11) and the cutting blade portion (12) are arranged at an angle. The first side of the cutting blade portion (12) connected to the shank portion (11) is inclined outward from bottom to top to form a first inclined surface (121). The second side of the cutting blade portion (12) connected to the shank portion (11) is inclined outward from bottom to top to form a second inclined surface (122). The first inclined surface (121) and the second inclined surface (122) are arranged opposite to each other along the extension direction of the shank portion (11). The bottom surface of the cutting blade portion (12) that is away from the shank portion (11) along the extension direction of the cutting blade portion (12) is inclined outward from bottom to top to form a third inclined surface (123). The blade (3) is fixedly connected to the end of the blade portion (12) away from the handle portion (11).

2. The turning tool for machining irregular holes according to claim 1, characterized in that, The first inclined surface (121) has an inclination angle b of 3°-7° with respect to the vertical direction.

3. The turning tool for machining irregular holes according to claim 1, characterized in that, The inclination angle α between the third inclined surface (123) and the horizontal direction is 45°-55°.

4. The turning tool for machining irregular holes according to any one of claims 1-3, characterized in that, The lathe tool for machining irregular holes also includes: A clamping member (2) is provided, one end of which is fixedly connected to the blade part (12), and the other end of which can simultaneously abut against the upper surface of the blade part (12) and part of the blade (3).

5. The turning tool for machining irregular holes according to claim 4, characterized in that, The blade portion (12) has an inclined protrusion (125) formed on its upper surface in the vertical direction. The upper surface of the inclined protrusion (125) is inclined toward one side of the blade (3), and the other end of the clamping member (2) can abut against part of the upper surface of the inclined protrusion (125).

6. The turning tool for machining irregular holes according to any one of claims 1-3, characterized in that, The lathe tool for machining irregular holes also includes: The blade (3) is fixedly connected to the end of the blade portion (12) away from the handle portion (11) by the fixing member (4).

7. The turning tool for machining irregular holes according to any one of claims 1-3, characterized in that, The length D2 of the blade section (12) is 39mm-40mm.

8. The turning tool for machining irregular holes according to any one of claims 1-3, characterized in that, The handle portion (11) and the blade portion (12) are integrally formed and connected.

9. The turning tool for machining irregular holes according to any one of claims 1-3, characterized in that, Both the handle (11) and the blade (12) are made of 40CrMoA material.

10. A diffuser, characterized in that, The inner wall of the diffuser is machined using a lathe tool for machining irregular holes as described in any one of claims 1-9.

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