Finishing device and method for distributed aero-engine bearing rings

Abstract

Provided are a finishing device for aero-engine bearing rings and a finishing method for distributed aero-engine bearing rings, which belong to the technical field of grinding or polishing devices or techniques, and solve the technical problem of low finishing efficiency of an existing rotary barrel finishing by floating clamp. N suspension assemblies are arranged in a container body, and the centers of the N suspension assemblies are located on a second virtual circle with the center of a bottom wall of the container body as the center of a circle. Through an eccentric arrangement of a bearing ring to be finished, an internal space of the container body is effectively and reasonably utilized, and N bearing rings can be simultaneously finished.

Claims

1. A distributed finishing method for aero-engine bearing rings implemented by a distributed finishing device for aero-engine bearing rings, wherein the device comprises a finishing container and N suspension assemblies, and the finishing container comprises a container body and a sealing cover in detachable connection; each of the N suspension assemblies comprises a plurality of support rods configured to support bearing rings to be finished and uniformly distributed along a first virtual circle, the finishing container is filled with finishing media; the device further comprises a rotary driving motor, a universal joint coupling, mounting frames, and an excitation platform; flanges are fixedly connected to central positions of the sealing cover and a bottom wall of the container body outside the finishing container, and support shafts are fixedly connected to the central positions of the sealing cover and the bottom wall of the container body outside the finishing container by the flanges; the mounting frames are fixedly connected to the excitation platform by stiffener plates, rotating bearings are rotatably mounted at upper parts of the mounting frames, and the support shafts are connected to the rotating bearings on the mounting frames; one of the support shafts is connected to an output shaft of the rotary driving motor through the universal joint coupling, and the method comprises the following steps: Step 1: mounting N bearing rings to be finished onto the N suspension assemblies in the finishing container, filling the container body of the finishing container with the finishing media, and assembling the container body and the sealing cover into the finishing container; Step 2: fixedly connecting the finishing container to a position between the support shafts by the flanges; Step 3: starting the rotary driving motor to make the finishing container rotate around an axis thereof at a rotating speed n, starting the excitation platform at the same time to make the finishing container achieve a simple harmonic motion with an amplitude of A.sub.1 and a frequency of f.sub.1 in a vertical direction, wherein the finishing container forces the finishing media therein to move to carry out finishing on the N bearing rings to be finished; Step 4: changing an excitation direction of the excitation platform after finishing for time t.sub.1, enabling the finishing container to achieve an additional simple harmonic motion with an amplitude of A.sub.2 and a frequency of f.sub.2 in a horizontal direction consistent with the axis of the finishing container, wherein the finishing container forces the finishing media therein to move to carry out finishing on the N bearing rings to be finished; and Step 5: completing surface finishing of the N bearing rings to be finished after finishing for time t.sub.2, turning off the excitation platform and the rotary driving motor, taking down the finishing container, and taking out the N finished bearing rings from the finishing container.

2. The distributed finishing method for aero-engine bearing rings according to claim 1, wherein in Step 3, the rotating speed n of the finishing container ranges from 80% n.sub.cr to 120% n.sub.cr, $n_{cr}\frac{42.7}{\sqrt{2R}}$ is a critical rotating speed of the finishing container, and R is a radius of an inner wall of the container body, in meters (m).

3. The distributed finishing method for aero-engine bearing rings according to claim 1, wherein in Step 3, A.sub.1 ranges from 2 mm-8 mm and f.sub.1 ranges from 5 Hz-25 Hz.

4. The distributed finishing method for aero-engine bearing rings according to claim 1, wherein in Step 4, A.sub.2 ranges from 2 mm-8 mm and f.sub.2 ranges from 5 Hz-25 Hz.

5. The distributed finishing method for aero-engines bearing ring according to claim 1, wherein a loading amount of the finishing media in the finishing container is 70%-90% of a volume of the finishing container.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The accompanying drawings herein are incorporated into and constitute a part of this specification, which show the embodiments in line with the present disclosure, and serve to explain the principle of the present disclosure together with the specification.

(2) To describe the technical solutions in the embodiments of the present disclosure or in the prior art more clearly, the following briefly introduces the accompanying drawings required for describing the embodiments or the prior art. Apparently, the accompanying drawings in the following description show merely some embodiments of the present disclosure, and those of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts.

(3) FIG. 1 is a schematic diagram of a container body of a finishing device for distributed aero-engine bearing rings according to a certain embodiment of the present disclosure and a distribution structure of bearing rings to be finished inside the container body;

(4) FIG. 2 is a schematic diagram of the distribution of multiple suspension assemblies inside a finishing device for distributed aero-engine bearing rings according to a certain embodiment of the present disclosure;

(5) FIG. 3 is a schematic diagram of the mounting of a driving assembly when a finishing device for distributed aero-engine bearing rings according to a certain embodiment of the present disclosure is used for polishing and grinding;

(6) FIG. 4 is a schematic diagram of a finishing device for distributed aero-engine bearing rings according to a certain embodiment of the present disclosure when carrying out an excitation motion in a vertical direction;

(7) FIG. 5 is a schematic diagram of a finishing device for distributed aero-engine bearing rings according to a certain embodiment of the present disclosure when carrying out an excitation motion in a horizontal direction;

(8) FIG. 6 is a surface topography diagram of an inner surface of a bearing ring to be finished according to an embodiment of the present disclosure before finishing;

(9) FIG. 7 is a surface topography diagram of an inner surface of a bearing ring to be finished according to an embodiment of the present disclosure after finishing;

(10) FIG. 8 is a surface topography diagram of an outer surface of a bearing ring to be finished according to an embodiment of the present disclosure before finishing;

(11) FIG. 9 is a surface topography diagram of an outer surface of a bearing ring to be finished according to an embodiment of the present disclosure after finishing;

(12) FIG. 10 is a surface topography diagram of an end surface of a bearing ring to be finished according to an embodiment of the present disclosure before finishing;

(13) FIG. 11 is a surface topography diagram of an end surface of a bearing ring to be finished according to an embodiment of the present disclosure after finishing.

(14) In the drawings: 1rotary driving motor; 2universal joint coupling; 3support shaft; 4container body; 5finishing container; 6flange; 7rotating flange; 8mounting frame; 9excitation platform; 10lower connecting disk; 11lower limiting bar; 12suspension assembly; 13bearing ring to be finished; 14finishing media; 15sealing cover; 16support rod; 17bottom wall; 18stiffener plate; 100first virtual circle; 200second virtual circle.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(15) To make the objectives, features and advantages of the present disclosure more clearly, the following further describes the schemes of the present disclosure in detail. It should be noted that the embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict.

(16) In the description, it should be noted that the terms first and second are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the present disclosure, unless expressly specified and limited otherwise, the terms mount, couple and connect should be understood broadly, e.g., may be a fixed connection, a detachable connection, or an integrated connection; may be a mechanical connection, or an electrical connection; may be a direct connection, an indirect connection through intermediate media, or an internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood on a case-by-case basis.

(17) Many specific details are set forth in the following description for the thorough understanding of the present disclosure. However, the present disclosure may also be implemented in a variety of manners different from those described herein. Apparently, the embodiments in the specification are only part rather than all of the embodiments of the present disclosure.

(18) The specific embodiments of the present disclosure are further described below in detail with reference to FIG. 1 to FIG. 11.

(19) In an embodiment, as shown in FIG. 1 and FIG. 2, a finishing device for distributed aero-engine bearing rings includes a finishing container 5, an upper connecting disk, a lower connecting disk 10, an upper limiting bar, a lower limiting bar 11, and a suspension assembly 12. The finishing container 5 includes a container body 4 and a sealing cover 15 in detachable connection. The suspension assembly 12 is fixed into the container body 4, and includes multiple support rods 16 configured to support a bearing ring 13 to be finished and uniformly distributed along a first virtual circle 100. The finishing container is filled with finishing media 14, and the number of the suspension assemblies 12 is N. The N suspension assemblies 12 are fixedly connected to a bottom wall 17 of the container body 4 through the lower connecting disk 10. The centers of the N suspension assemblies 12 are located on a second virtual circle 200 which takes the center of a bottom wall 17 of the container body 4 as the center, and the N suspension assemblies 12 are uniformly distributed along the second virtual circle 200. A radius of the first virtual circle 100 in each suspension assembly 12 is R.sub.d, a radius of the support rod 16 in each suspension assembly 12 is R.sub.sb, and the centers of N first virtual circles 100 corresponding to the N suspension assemblies 12 are O.sub.i, respectively, in which i=1, 2, . . . , N. A spacing between the center O.sub.i of each of the N first virtual circles 100 and the center O of the second virtual circle 200 is e, that is, e is an eccentric distance of the center O.sub.i of each of the N first virtual circles 100 relative to the center O of the second virtual circle 200. The device further includes a rotary driving motor 1, a universal joint coupling 2, mounting frames 8, and an excitation platform 9. Flanges 6 are fixedly connected to central positions of a front wall (i.e. the sealing cover 15) and a rear wall (i.e. the bottom wall 17) outside the finishing container 5, respectively, and support shafts 3 are fixedly connected to the central positions of the front wall and the rear wall outside the finishing container 5 by the flanges 6, respectively. The mounting frames 8 are fixedly connected to the excitation platform 9 by stiffener plates 18, a rotating bearing 7 is rotatably mounted at an upper part of each mounting frame 8, and the support shafts 3 on the front wall and the rear wall of the finishing container 5 are connected to the rotating bearings 7 on the mounting frames 8, respectively. The support shaft 3 on one side is connected to an output shaft of the decelerated rotary driving motor 1 through the universal joint coupling 2.

(20) The number N of the suspension assemblies 12 satisfies a formula (I):

(21) $\begin{array}{cc}N\min \left\{\frac{1000F}{{}^{2}A\left(m_r+6m_{\mathrm{sb}}+6m_{\mathrm{lb}}\right)}\frac{m_p-m_m-m_v-m_t}{\left(m_r+6m_{\mathrm{sb}}+6m_{\mathrm{lb}}\right)},\frac{60T_s{t}_s}{{\mathrm{nR}}^2\left(m_r+6m_{\mathrm{sb}}+6m_{\mathrm{lb}}\right)}-\frac{m_p-m_m-m_v}{\left(m_r+6m_{\mathrm{sb}}+6m_{\mathrm{lb}}\right)}\right\}& \left(I\right)\end{array}$

(22) in the formula I, is an angular frequency, =2f; f is an excitation frequency, Hz; A is an excitation amplitude, mm; m.sub.r is a mass of the bearing ring 13 to be finished, kg; m.sub.sb is a mass of the support rod 16, kg; m.sub.lb is a total mass of the upper limiting bar and the lower limiting bar, 111, kg; m.sub.p is a total mass of the upper connecting disk and the lower connecting disk 10, kg; m.sub.m is a mass of the finishing media, kg; m.sub.v is a mass of the finishing container 5, kg; m.sub.t is a total mass of the flange 6, the support shaft 3, the mounting frame 8, the rotating bearing 7 as well as the stiffener plate 18 on the mounting frame 8, kg; F is an excitation force capable of being provided by the excitation platform 9, N; T.sub.s is a starting torque of the rotary driving motor 1, N.Math.m; t.sub.s is starting time of the rotary driving motor 1, s; n is a rotating speed of the finishing container 5, r/min; and R is an inner radius of the container body 4, m.

(23) The eccentric distance e satisfies e>{square root over (2)}R.sub.o+{square root over (2)}R.sub.i{square root over (2)}R.sub.d2{square root over (2)}R.sub.sb, which is used to prevent rings in the container body from interfering with each other. e can be obtained from a formula (II):

(24) $\begin{array}{cc}e=R-l_2-\frac{3}{2}{R}_o+\frac{1}{2}{R}_i& \left(\mathrm{II}\right)\end{array}$

(25) in the formula (II), R is an inner radius of the container body 4, m, and if the container body 4 is a polygon, such as a regular hexagon, R is a radius of an inscribed circle of the container body 4; l.sub.2 is a vertical distance from an outer surface of the bearing ring 13 to be finished at the lowest end to an inner wall of the container body 4 when the finishing container 5 is stationary, m; l.sub.2 is greater than 3d, and d is a diameter of the finishing media; R.sub.o is an outer diameter of the bearing ring 13 to be finished, m; R.sub.i is an inner diameter of the bearing ring 13 to be finished, m.

(26) When the finishing container 5 is stationary, a vertical distance from the support rod 16 at the lowest end in the suspension assembly 12 limits the vertical motion of the bearing ring 13 to be finished is when the container body 4 vibrates in a vertical direction, l.sub.1 greater than A need to be satisfied, and l.sub.1 can be obtained through a formula (III):
l.sub.1=2R.sub.i2R.sub.sb2R.sub.d(III).

(27) A certain embodiment of the present disclosure further provides a finishing method for distributed aero-engine bearing rings. The method is implemented based on the finishing device for distributed aero-engine bearing rings, and includes the following steps: Step 1: mounting N bearing rings 13 to be finished onto N suspension assemblies 12 in a finishing container 5, filling a container body 4 of the finishing container 5 with finishing media 14, and assembling the container body 4 and a sealing cover 15 into the finishing container 5; Step 2: fixedly connecting the finishing container 5 to a position between two support shafts 3 by flanges 6; Step 3: starting a rotary driving motor 1 to make the finishing container 5 to rotate around an axis thereof at a rotating speed n, starting an excitation platform 9 at the same time to make the finishing container 5 achieve a simple harmonic motion with an amplitude of A.sub.1 and a frequency of f.sub.1 in a vertical direction, wherein the finishing container 5 forces a finishing media 14 therein to move in a compound motion attitude to carry out finishing on the bearing ring 13 to be finished; Step 4: changing an excitation direction of the excitation platform 9 after finishing for time t.sub.1, enabling the finishing container 5 to achieve a simple harmonic motion with an amplitude of A.sub.2 and a frequency of f.sub.2 in a horizontal direction consistent with the axis thereof, wherein the finishing container 5 forces finishing media 14 therein to move in a compound motion attitude to carry out finishing on the bearing ring 13 to be finished; and Step 5: completing surface finishing of the bearing ring 13 to be finished after finishing for time t.sub.2, turning off the excitation platform 9 and the rotary driving motor 1, and taking down the finishing container 5, and taking out the finished bearing ring from the finishing container 5.

(28) In order to achieve the surface integrity forming capacity of the inner and outer surfaces of the ring, there is a need to enhance the impact effect of the finishing media 14 on the inner and outer surfaces of the bearing ring 13 to be finished, and thus the finishing container 5 is excited in a vertical direction (Z-direction). In order to achieve the surface integrity forming capacity of the end surface of the ring, there is a need to enhance the impact effect of the finishing media 14 on the end surface of the bearing ring 13 to be finished, and thus the finishing container 5 is excited in a horizontal direction (X-direction). By alternately exciting the finishing container 5 in the vertical direction (Z-direction) and the horizontal direction (X-direction), the finishing requirements of the surface integrity forming of the inner surface, the outer surface and the end surface of the bearing ring 13 to be finished are fulfilled. The rotary driving motor 1 is connected to the finishing container 5 through the universal joint coupling 2, such that the finishing container 5 may achieve a composite motion state.

(29) In a specific embodiment, if N is equal to 4, the number of the suspension assemblies 12 and the number of the bearing rings 13 to be finished are both 4, an eccentric distance e is 85 mm, the container body 4 is a regular hexagon, and an inscribed circle thereof has a radius R of 150 mm. A vertical distance l.sub.2 from an outer surface of the bearing ring 13 to be finished at the lowest end to an inner wall of the container body 4 is 12.5 mm, an outer diameter R.sub.o of the bearing ring 13 to be finished is 50 mm, an inner diameter R.sub.i of the bearing ring 13 to be finished is 45 mm, and a width of the bearing ring 13 to be finished is 10 mm. There are six support rods 16 in the suspension assembly 12, a radius R.sub.sb of the support rod 16 is 7.5 mm, and a radius R.sub.d of a first virtual circle 100 is 35 mm. Lower limiting bars 11 are inserted between the six support rods 16 of the suspension assembly l.sub.2, respectively, and there are six lower limiting bars 11. A vertical distance l.sub.1 from the support rod 16 at the lowest end in the suspension assembly 12 to the inner surface of the bearing ring 13 to be finished is 5 mm. The finishing media 14 are a mixture of spherical Al.sub.2O.sub.3 particles with a particle size of 3 mm and liquid media. The finishing time t.sub.1 is 120 min, and the finishing time t.sub.1 is 120 min.

(30) Based on the above embodiments, in a preferred embodiment, in Step 3, the rotating speed n of the finishing container 5 ranges from 80% n.sub.cr to 120% n.sub.cr,

(31) $n_{cr}=\frac{42.7}{\sqrt{2R}}$
is a critical rotating speed of the finishing container, and R is an inner radius of the container body 4, m. In a specific embodiment, the rotating speed n is 60 r/min.

(32) Based on the above embodiments, in a preferred embodiment, in Step 3, the excitation platform 9 has an amplitude of 2-8 mm and a frequency of 5-25 Hz in a vertical direction. In a specific embodiment, the amplitude is 4 mm, and the frequency is 15 Hz.

(33) Based on the above embodiments, in a preferred embodiment, in Step 4, the excitation platform 9 has an amplitude of 2-8 mm and a frequency of 5-25 Hz in a horizontal direction. In a specific embodiment, the amplitude is 4 mm, and the frequency is 15 Hz.

(34) Based on the above embodiments, in a preferred embodiment, a loading amount of the finishing media 14 in the finishing container 5 is 70%-90% of the volume of the finishing container 5. In a specific embodiment, the loading amount of the finishing media 14 is 80% of the volume of the container body 4.

(35) Finally, in a specific embodiment, a roughness Ra value of the inner surface of the bearing ring 13 to be finished is reduced from 0.938 m to 0.412 m, and scratches on the inner surface are partially removed; a roughness Ra value of the outer surface is reduced from 0.815 m to 0.698 m, and scratches on the outer surface are partially removed; and a roughness Ra value of the end surface is reduced from 1.686 m to 1.305 m, and scratches on the end surface are partially removed, thus achieving the target of finishing. As can be seen from FIG. 6 to FIG. 11, through the finishing device and method provided by the present disclosure, the roughness of each of the inner surface, the outer surface and the end surface of the machined bearing ring is effectively reduced, indicating that the method can satisfy the finishing demand for the surface integrity forming of the inner surface, the outer surface and the end surface of the ring.

(36) The above is only the specific embodiment of the present disclosure, such that those skilled in the art can understand or implement the present disclosure. Although the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it is still possible to modify the technical solution described in the foregoing embodiments, or to replace some or all technical features with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of various embodiments, and should be all included in the scope of protection of the claims.