A batch polishing device for aero-engine main bearing ring

Abstract

This invention relates to the field of polishing devices, specifically a batch polishing device for aero-engine main bearing races. It solves the technical problems of low processing efficiency and insufficient surface forming ability of existing rotary polishing floating fixtures. The device includes a rotary polishing floating fixture, with the races to be processed fitted onto the outside of a polygon formed by all support rods. Multiple rotary polishing floating fixtures are included. The device also includes a first rotating disk, a second rotating disk, a first drive mechanism, a processing table, and a second drive mechanism. The first and second rotating disks are rotatably connected to the processing table via a first support assembly. The first drive mechanism drives the first rotating disk to revolve. A rotary polishing floating fixture is rotatably installed between the first and second rotating disks via a second support assembly. The second drive mechanism drives the corresponding rotary polishing floating fixture to rotate, with the rotation and revolution directions opposite.

Description

Technical Field

[0001] This invention relates to the field of polishing apparatus, specifically a batch polishing apparatus for aero-engine main bearing rings. Background Technology

[0002] As a high-speed rotating core support component, the main bearing of an aero-engine (hereinafter referred to as the main bearing) has inner and outer rings that are important load-bearing elements, characterized by a wide range of sizes and a large number of rings. How to achieve efficient, uniform, and consistent polishing of the main bearing rings has become a technical bottleneck that urgently needs to be overcome.

[0003] Tumbling finishing is a widely applicable surface-shape synergistic polishing manufacturing process. Its principle is that the polishing medium gains kinetic energy from the container wall in different motion patterns, performing micro-cutting and grinding actions on the workpiece surface inside the container, thereby achieving a smooth surface. Centrifugal tumbling finishing, due to the change in container motion, can overcome the shortcomings of traditional rotary tumbling, such as low efficiency and poor processing quality. However, during centrifugal tumbling, the workpiece is in a free state and may collide with each other, making it difficult to meet the damage-free requirements of high-end precision parts such as aero-engine main bearing rings.

[0004] A rotary polishing floating fixture (CN202211059711.7) for surface machining of ring-shaped parts is proposed in the prior art. It includes a machining container, a lower connecting plate, an upper connecting plate, and at least three support rods. The machining container includes a detachably connected machining chamber and a cover. The lower connecting plate is fixed to the center of the bottom wall of the machining chamber, and the upper connecting plate is fixed to the center of the inner wall of the cover. The two ends of the support rods are detachably vertically connected to the upper and lower connecting plates, respectively, and all support rods are evenly distributed on a circumference centered on the center of the bottom wall of the machining chamber. The ring to be machined is fitted around all the support rods, and the inner diameter of the ring is larger than the radius of the circumference on which the support rods are located. The machining container is filled with polishing media. This rotary polishing floating fixture can achieve damage-free clamping and overall polishing of the ring, but the processing efficiency is still low, and the surface properties and performance improvement capabilities are insufficient. Summary of the Invention

[0005] To overcome the technical shortcomings of existing rotary polishing floating tooling, such as low processing efficiency and insufficient surface forming ability, this invention provides a batch polishing device for aero-engine main bearing rings.

[0006] This invention provides a batch polishing device for aero-engine main bearing races, comprising a rotary polishing floating fixture, wherein the race to be processed is fitted onto the outside of a polygon formed by all the support rods, and the race to be processed rotates at an angular velocity ω driven by friction. iThe rotary polishing floating fixtures are multiple in number and include a first revolution disk, a second revolution disk, a first drive mechanism, a processing table, and a second drive mechanism equal in number to the rotary polishing floating fixtures. The first revolution disk and the second revolution disk are rotatably connected to the processing table via a first support assembly. The first drive mechanism is used to drive the first revolution disk to revolve at an angular velocity Ω. The rotary polishing floating fixtures are rotatably installed between the first revolution disk and the second revolution disk via a second support assembly. The second drive mechanism is used to drive the corresponding rotary polishing floating fixtures to rotate at an angular velocity ω. The rotation and revolution directions are opposite. The rotation axis of the rotary polishing floating fixture is parallel to the revolution axis of the first revolution disk. The multiple rotary polishing floating fixtures are evenly arranged along the circumference, and the center of the circumference is located on the revolution axis of the first revolution disk.

[0007] The dynamic equations of motion of the ring to be processed satisfy:

[0008] ,

[0009] When the support rod contacts the ring to be processed, the ring is subjected to the combined action of the frictional force applied by the support rod and the viscous damping of the polishing medium. When the support rod separates from the ring, there is no contact normal force, and the ring only rotates due to inertia under the action of viscous damping. J is the moment of inertia of the ring, μ is the coefficient of friction, N is the contact normal force, R is the radius of the circumference of the support rod, and r is the radius of the ring. s R is the radius of the support rod. r Let be the inner radius of the ring to be processed, b be the viscous damping coefficient, i = 1, 2, ..., n, and n be the number of rotary polishing floating fixtures (1).

[0010] Preferably, the first and second revolution disks are both located in the vertical direction and are parallel to each other, while the revolution axis and the rotation axis are both located in the horizontal direction.

[0011] Preferably, the first support assembly includes a first bracket, a second bracket, a first rotary support shaft, and a second rotary support shaft. The first rotary disk is connected to the upper part of the first bracket via the first rotary support shaft, and the second rotary disk is connected to the upper part of the second bracket via the second rotary support shaft. The first drive mechanism is connected to the first rotary support shaft. The axes of the first rotary support shaft, the first rotary disk, the second rotary support shaft, the second rotary disk, and the drive shaft of the first drive mechanism are collinear and all located in the horizontal direction.

[0012] Preferably, the second support assembly includes a third rotary support shaft and a fourth rotary support shaft. The right side wall of the rotary polishing floating fixture is rotatably connected to the first revolution disk via the third rotary support shaft, and the left side wall of the rotary polishing floating fixture is rotatably connected to the second revolution disk via the fourth rotary support shaft. The second drive mechanism is driven by the third rotary support shaft. The axes of the third rotary support shaft, the fourth rotary support shaft, the rotary polishing floating fixture, and the drive shaft of the second drive mechanism corresponding to each set of positions are collinear and all located in the horizontal direction.

[0013] Preferably, the ratio of the rotational angular velocity ω to the revolution angular velocity Ω is -1.2 to -0.8.

[0014] Preferably, the rotational angular velocity ω is 5π / 3~20π / 3 rad / s, and the revolution angular velocity Ω is 5π / 3~20π / 3 rad / s.

[0015] Compared with the prior art, the technical solution provided by this invention has the following technical effects: by uniformly distributing multiple circumferentially rotating polishing floating fixtures and cooperating with a stable forced flow field, the consistency of the same batch of bearing rings to be processed is improved; it supports simultaneous polishing of aero-engine main bearing rings with different inner diameters and widths, meeting the needs of multi-specification batch processing; the rotation and revolution are carried out synchronously, improving the surface properties and performance control capabilities of the bearing rings to be processed; in addition, the planetary composite motion design with opposite revolution and rotation can effectively eliminate the critical angular velocity limitation of traditional rotary polishing, significantly improving processing efficiency. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 The relative arrangement of the rotary polishing floating fixture and the first rotating disk in a batch polishing device for aero-engine main bearing rings according to a certain embodiment of the present invention;

[0019] Figure 2 This is a side view of a batch polishing device for aero-engine main bearing rings according to a certain embodiment of the present invention;

[0020] Figure 3This is an assembly diagram of the bearing rings to be processed in a rotary polishing floating fixture in a batch polishing device for aero-engine main bearing rings according to a certain embodiment of the present invention.

[0021] Figure 4 The motion angular velocity curve of the bearing ring to be processed in a certain embodiment of the present invention when it is processed using the batch polishing device for aero-engine main bearing rings;

[0022] Figure 5 This is a contour height curve of the inner surface of the ring to be processed before and after polishing in a certain embodiment of the present invention, where (a) is before polishing and (b) is after polishing.

[0023] Figure 6 This is a contour height curve of the outer surface of the ring to be processed before and after polishing in a certain embodiment of the present invention, where (a) is before polishing and (b) is after polishing.

[0024] In the figure: 1. Rotary polishing floating fixture; 2. Ring to be processed; 3. Support rod; 4. First revolution disc; 5. Second revolution disc; 6. First drive mechanism; 7. Processing table; 8. Second drive mechanism; 9. First bracket; 10. Second bracket; 11. First rotary support shaft; 12. Second rotary support shaft; 13. Third rotary support shaft; 14. Fourth rotary support shaft. Detailed Implementation

[0025] To better understand the above-mentioned objectives, features, and advantages of the present invention, the solutions of the present invention will be further described below. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

[0026] In this description, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. It should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joint" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0027] Many specific details are set forth in the following description in order to provide a full understanding of the invention, but the invention may also be practiced in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the invention, and not all embodiments.

[0028] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0029] In one embodiment, such as Figure 1 As shown, a batch polishing device for aero-engine main bearing races is disclosed, including a rotary polishing floating fixture 1, a race 2 to be processed fitted outside the polygon formed by all the support rods 3, and the race 2 to be processed rotates at an angular velocity ω driven by friction. i The rotary polishing floating fixture 1 is multiple in number and also includes a first revolution disk 4, a second revolution disk 5, a first drive mechanism 6, a processing table 7, and a second drive mechanism 8 equal in number to the rotary polishing floating fixture 1. The first revolution disk 4 and the second revolution disk 5 are rotatably connected to the processing table 7 through a first support assembly. The first drive mechanism 6 is used to drive the first revolution disk 4 to revolve at an angular velocity Ω. The rotary polishing floating fixture 1 is rotatably installed between the first revolution disk 4 and the second revolution disk 5 through a second support assembly. The second drive mechanism 8 is used to drive the corresponding rotary polishing floating fixture 1 to rotate at an angular velocity ω. The rotation and revolution directions are opposite. The rotation axis of the rotary polishing floating fixture 1 is parallel to the revolution axis of the first revolution disk 4. Multiple rotary polishing floating fixtures 1 are evenly arranged along the circumference, and the center of the circumference is located on the revolution axis of the first revolution disk 4.

[0030] The dynamic equations of motion for the ring 2 to be processed satisfy:

[0031] ,

[0032] When the support rod 3 contacts the collar 2 to be processed, the collar 2 is subjected to the combined action of the frictional force applied by the support rod 3 and the viscous damping of the polishing medium; when the support rod 3 separates from the collar 2, there is no contact normal force, and the collar 2 only rotates due to inertia under the action of viscous damping; J is the moment of inertia of the collar 2, μ is the coefficient of friction, N is the contact normal force, R is the radius of the circumference of the support rod 3, and r is the radius of the circle containing the support rod 3. s Rr is the radius of the support rod 3, Rr is the inner radius of the collar 2 to be processed, b is the viscous damping coefficient, i=1,2,…,n, and n is the number of rotary polishing floating fixtures 1.

[0033] In this batch polishing device, the rotary polishing floating fixture 1 can both revolve at an angular velocity Ω and rotate at an angular velocity ω, with the directions of revolution and rotation being opposite. Since the diameter of the circumference of the support rod 3 in the rotary polishing floating fixture 1 is smaller than the inner diameter of the ring 2 to be processed, the ring 2 to be processed and the support rod 3 achieve periodic "separation-contact" motion through friction, thereby forming a continuous and approximately uniform rotary motion. The rotary polishing floating fixture 1 used in this invention is a device disclosed in the background art, and its internal structure is a conventional structure well known to those skilled in the art. A processing medium is pre-filled in the polishing container, with a filling ratio of 60%-80% of the container volume. This processing medium is a two-phase flow medium composed of polishing blocks and polishing fluid; in a specific embodiment, the processing medium filling amount in a single polishing container is 70% of the container volume.

[0034] Based on the above embodiments, in a preferred embodiment, the first revolution disk 4 and the second revolution disk 5 are both located in the vertical direction and are parallel to each other, and the revolution axis and the rotation axis are both located in the horizontal direction.

[0035] Based on the above embodiments, in a preferred embodiment, the first support assembly includes a first bracket 9, a second bracket 10, a first rotary support shaft 11, and a second rotary support shaft 12. A first rotary disk 4 is connected to the upper part of the first bracket 9 via the first rotary support shaft 11, and a second rotary disk 5 is connected to the upper part of the second bracket 10 via the second rotary support shaft 12. A first drive mechanism 6 is connected to the first rotary support shaft 11. The axes of the first rotary support shaft 11, the first rotary disk 4, the second rotary support shaft 12, the second rotary disk 5, and the drive shaft of the first drive mechanism 6 are collinear and all located in the horizontal direction. The drive shaft of the first drive mechanism 6 is connected to the first rotary support shaft 11 via a reducer. The first drive mechanism 6 drives the first rotary support shaft 11 to rotate, thereby driving the first rotary disk 4 to rotate. The first rotary disk 4 drives multiple rotary polishing floating fixtures 1 and the second rotary disk 5 connected to it to rotate synchronously.

[0036] Based on the above embodiments, in a preferred embodiment, the second support assembly includes a third rotary support shaft 13 and a fourth rotary support shaft 14. The right side wall of the rotary polishing floating fixture 1 is rotatably connected to the first revolution disk 4 via the third rotary support shaft 13, and the left side wall of the rotary polishing floating fixture 1 is rotatably connected to the second revolution disk 5 via the fourth rotary support shaft 14. The second drive mechanism 8 is drively connected to the third rotary support shaft 13. The drive shaft axes of the third rotary support shaft 13, the fourth rotary support shaft 14, the rotary polishing floating fixture 1, and the second drive mechanism 8 corresponding to each set of positions are collinear and all located in the horizontal direction. The drive shaft of the second drive mechanism 8 is connected to the third rotary support shaft 13 via a reducer. The second drive mechanism 8 drives the third rotary support shaft 13 to rotate, thereby causing the third rotary support shaft 13 to rotate. The third rotary support shaft 13 drives the rotary polishing floating fixture 1 and the fourth rotary support shaft 14 connected to it to rotate synchronously.

[0037] Based on the above embodiments, in a preferred embodiment, the ratio of the rotational angular velocity ω to the revolution angular velocity Ω is -1.2 to -0.8. Because the rotation and revolution are in opposite directions, the angular velocity ratio is negative.

[0038] Based on the above embodiments, in a preferred embodiment, the rotational angular velocity ω is 5π / 3~20π / 3 rad / s, and the revolution angular velocity Ω is 5π / 3~20π / 3 rad / s. In a specific embodiment, the rotational angular velocity ω is 2π rad / s, and the revolution angular velocity Ω is 2π rad / s. Since the directions of rotation and revolution are opposite, the ratio of the rotational angular velocity ω to the revolution angular velocity Ω is -1.

[0039] The working process of the batch polishing device for aero-engine main bearing rings described in this invention is as follows:

[0040] S1. The first support assembly is installed onto the processing table 7 by means of bolt assembly, and the first rotary disk 4 is connected to the first bracket 9 of the first support assembly by means of the first rotary support shaft 11.

[0041] S2: Add polishing medium to the rotary polishing floating fixture 1, and place the ring to be processed 2 on the support rod 3 in the rotary polishing floating fixture 1 to close the rotary polishing floating fixture 1.

[0042] S3: The rotary polishing floating fixture 1, which contains the ring to be processed 2 and polishing media, is installed onto the first rotary disk 4 via the third rotary support shaft 13.

[0043] S4: Repeat steps S2-S3 to install multiple rotary polishing floating fixtures 1 onto the first rotary disk 4 in sequence;

[0044] S5: Connect multiple rotary polishing floating fixtures 1 to the second rotary disk 5 via the fourth rotary support shaft 14, and then connect the second rotary disk 5 to the second bracket 10 of the first support assembly via the second rotary support shaft 12.

[0045] S6: Start the first drive mechanism 6 and adjust its angular velocity so that the angular velocity of the first revolution disk 4 is between 5π / 3 and 20π / 3 rad / s;

[0046] S7: Start the second drive mechanism 8 and adjust its angular velocity so that the angular velocity of the second drive mechanism 8 is between 5π / 3 and 20π / 3 rad / s;

[0047] S8: The rotary polishing floating fixture 1 rotates with a revolution angular velocity Ω and a self-rotation angular velocity ω. The polishing medium forms a forced flow field to achieve the finishing of the ring 2 to be processed.

[0048] S9: After processing time t, stop the first drive mechanism 6 and the second drive mechanism 8; specifically, the processing time t is 30 minutes.

[0049] S10: Remove the rotary polishing floating fixture 1, open it and take out the finished ring.

[0050] In a specific embodiment, a single rotary polishing floating fixture 1 has six support rods 3 evenly distributed in the circumferential direction, and the radius of the support rods 3 is r. s The diameter is 7.5mm, the radius R of the circumference of the support rod 3 is 35mm, the weight of the collar 2 to be processed is 0.129kg, and the moment of inertia J of the collar 2 to be processed is 3.225×10⁻⁶. -4 kg·m 2 The inner radius Rr of the ring to be processed 2 is 50mm, and the viscous damping coefficient b is 0.01.

[0051] Finally, in the specific embodiment, the movement of the collar 2 to be processed is as follows: Figure 4 As shown. After processing, as... Figure 5 and Figure 6 As shown, the inner surface roughness Ra value of the collar decreased from 0.628 μm to 0.369 μm, and the outer surface roughness Ra value decreased from 0.725 μm to 0.610 μm. Figure 5 (a) and Figure 6 As shown in (a), before polishing, the inner and outer surfaces of the ring 2 to be processed have many sharp peaks and troughs, and the absolute difference between the peaks and troughs is relatively large, such as... Figure 5 (b) and Figure 6 As shown in (b), the peak-to-trough ratio was significantly improved after polishing, achieving the goal of finishing.

[0052] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the present invention. Although detailed descriptions have been provided with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments, and they should all be covered within the protection scope of the claims.

Claims

1. A batch polishing device for main bearing rings of aero-engines, comprising a rotary polishing floating fixture (1), wherein the rings (2) to be processed are fitted outside the polygon formed by all the support rods (3) of the rotary polishing floating fixture (1), and the rings (2) to be processed are driven to rotate by friction at an angular velocity ω. i Its characteristics are, The rotary polishing floating fixture (1) comprises multiple components, including a first revolution disc (4), a second revolution disc (5), a first drive mechanism (6), a processing table (7), and a second drive mechanism (8) equal in number to the rotary polishing floating fixture (1). The first revolution disc (4) and the second revolution disc (5) are rotatably connected to the processing table (7) via a first support assembly. The first drive mechanism (6) drives the first revolution disc (4) to revolve at an angular velocity Ω. The rotary polishing floating fixture (1) is connected to the processing table (7) via a second support assembly. The support assembly is rotated and installed between the first and second revolution disks (4 and 5). The second drive mechanism (8) is used to drive the corresponding rotary polishing floating fixture (1) to rotate at an angular velocity ω. The rotation and revolution directions are opposite. The rotation axis of the rotary polishing floating fixture (1) is parallel to the revolution axis of the first revolution disk (4). Multiple rotary polishing floating fixtures (1) are evenly arranged along the circumference, and the center of the circumference is located on the revolution axis of the first revolution disk (4). The dynamic equation of the motion of the ring to be processed (2) satisfies: ， When the support rod (3) contacts the ring (2) to be processed, the ring (2) is subjected to the combined action of the friction force applied by the support rod (3) and the viscous damping applied by the polishing medium; when the support rod (3) separates from the ring (2), there is no contact normal force, and the ring (2) to be processed only rotates under the action of viscous damping; J is the moment of inertia of the ring (2), μ is the coefficient of friction, N is the contact normal force, R is the radius of the circumference of the support rod (3), and r is the radius of the circumference of the ring (2). s R is the radius of the support rod (3). r Let be the inner radius of the ring (2) to be processed, b be the viscous damping coefficient, i = 1, 2, ..., n, and n be the number of rotary polishing floating fixtures (1).

2. The batch polishing device for aero-engine main bearing rings according to claim 1, characterized in that, The first revolution disk (4) and the second revolution disk (5) are both located in the vertical direction and are parallel to each other. The revolution axis and the rotation axis are both located in the horizontal direction.

3. A batch polishing device for aero-engine main bearing rings according to claim 2, characterized in that, The first support assembly includes a first bracket (9), a second bracket (10), a first rotary support shaft (11), and a second rotary support shaft (12). The first rotary disk (4) is connected to the upper part of the first bracket (9) through the first rotary support shaft (11), and the second rotary disk (5) is connected to the upper part of the second bracket (10) through the second rotary support shaft (12). The first drive mechanism (6) is connected to the first rotary support shaft (11) in a transmission connection. The drive shaft axes of the first rotary support shaft (11), the first rotary disk (4), the second rotary support shaft (12), the second rotary disk (5), and the first drive mechanism (6) are collinear and all located in the horizontal direction.

4. A batch polishing device for aero-engine main bearing rings according to claim 3, characterized in that, The second support assembly includes a third rotary support shaft (13) and a fourth rotary support shaft (14). The right side wall of the rotary polishing floating fixture (1) is rotatably connected to the first revolution disk (4) through the third rotary support shaft (13). The left side wall of the rotary polishing floating fixture (1) is rotatably connected to the second revolution disk (5) through the fourth rotary support shaft (14). The second drive mechanism (8) is connected to the third rotary support shaft (13) for transmission. The drive shaft axes of the third rotary support shaft (13), the fourth rotary support shaft (14), the rotary polishing floating fixture (1), and the second drive mechanism (8) corresponding to each set of positions are collinear and all located in the horizontal direction.

5. A batch polishing device for aero-engine main bearing rings according to claim 4, characterized in that, The ratio of the rotational angular velocity ω to the revolution angular velocity Ω is -1.2 to -0.

8.

6. A batch polishing device for aero-engine main bearing rings according to claim 5, characterized in that, The rotational angular velocity ω is 5π / 3~20π / 3 rad / s, and the revolution angular velocity Ω is 5π / 3~20π / 3 rad / s.

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