Vertical local forced excitation polishing and grinding method for large wind power gear ring

Abstract

The invention belongs to the technical field of mechanical part surface finishing machining, and aims to solve the problem that traditional barreling finishing machining is difficult to meet the requirements for high precision and uniformity of a large wind power gear ring. The vertical local forced excitation polishing and grinding method for the large wind power gear ring comprises the following steps that a to-be-polished and ground section of the to-be-polished and ground large gear ring is placed in a polishing and grinding container filled with a machining medium; and a vibration excitation element in the machining medium is driven to perform combined motion of radial intermittent feeding motion, axial intermittent feeding motion and reciprocating linear motion, and is matched with circumferential intermittent rotary motion of the large gear ring, so that a locally forced particle flow field is formed in the machining medium, and gear surface finishing machining is performed on the large gear ring to be polished and ground. According to the large gear ring polishing and grinding device, intense exciting force can be applied to a certain specific tooth surface part of a large gear ring in a targeted mode, local polishing and grinding are conducted in a centralized mode, consistent polishing and grinding of different parts of the tooth surface of the large gear ring can be achieved in an all-around mode at a time, and the surface roughness of the large gear ring can be reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of surface finishing of mechanical parts, and in particular relates to a vertical local forced vibration polishing method for a large wind turbine gear ring. Background Art

[0002] Large-scale wind turbines, lightweight core components, independent key technologies, intelligent industrial development, and flexible production processes have become the development trend of wind power equipment. High-power density gearboxes are an important direction for large-scale wind turbines in the future, and the market demand is urgent. In order to improve its power density, the design of core parts such as gear rings is close to the load-bearing capacity limit, which is more prone to failure. The surface integrity after processing by existing manufacturing processes seriously affects the reliability and life of large wind turbine gear rings, and has become a weak link in large wind turbine gearboxes.

[0003] Wind turbines are installed in high mountains, wilderness, beaches, islands and other wind outlets. They are subject to irregular wind forces of changing direction and load, as well as strong gusts. They are affected by extreme heat and cold and temperature differences all year round. The harsh environment makes the gearbox installed in the small space on the top of the tower very prone to failure and difficult to repair. Timely prevention and efficient maintenance are particularly important. The failure forms of wind turbine gear rings include micropitting, abrasive wear, foreign body damage, surface corrosion, contact corrosion and other typical damage types. Traditional finishing methods are often performed through grinding, but grinding technology is complex and costly. At the same time, after nitriding treatment, the gear ring cannot be repaired by grinding after failure and can only be scrapped. The national standard stipulates that the upper limit of the wind turbine gear ring tooth surface roughness is 1.6 The maximum accuracy level is level 7. The accuracy level of the wind turbine gear ring after nitriding treatment can be reduced to level 8 in terms of runout and cumulative total deviation of pitch.

[0004] In view of the processing difficulties caused by the large modulus, large number of teeth, deep tooth grooves, and heavy weight of wind turbine gear rings, traditional roller grinding and finishing processes are difficult to meet their high precision and uniformity requirements. In addition, traditional finishing processes such as grinding face the problem of processing object limitations when processing wind turbine gear rings after nitriding. Summary of the invention

[0005] In order to solve at least one of the above-mentioned technical problems existing in the prior art, the present invention provides a method for vertical local forced vibration polishing of a large wind turbine gear ring.

[0006] The present invention is implemented by the following technical solution: A vertical local forced vibration polishing method for a large wind turbine gear ring, comprising the following steps: Placing the section of the large gear ring to be polished in a polishing container filled with a processing medium; The excitation element in the processing medium is driven to perform a combination of radial intermittent feed motion, axial intermittent feed motion and reciprocating linear motion, and the circumferential intermittent rotary motion of the large gear ring is coordinated to form a local forced particle flow field in the processing medium to perform tooth surface finishing processing on the large gear ring to be polished.

[0007] Preferably, the above-mentioned radial intermittent feed motion, axial intermittent feed motion and circumferential intermittent rotary motion are all determined based on the geometric position of the large gear ring.

[0008] Preferably, the polishing container is a trough-type structure, and a lifting mechanism, a feeding mechanism, a rotating mechanism and a vibrating mechanism are arranged outside the polishing container; wherein the vibrating mechanism, the feeding mechanism and the lifting mechanism are connected in sequence from top to bottom to form a combined motion mechanism for driving the vibration element, and the vibration element is connected to the vibration mechanism through a bridge-type section; the supporting cylindrical roller of the rotating mechanism is in contact with the outer periphery of the large gear ring for transmission; the large gear ring is arranged vertically and the section to be polished at its bottom is placed in the polishing container.

[0009] Preferably, radial intermittent feeding motion is provided by a lifting mechanism, and radial interval time and radial intermittent feeding amount are set; axial intermittent feeding motion is provided by a feeding mechanism, and axial interval time and axial intermittent feeding amount are set; circumferential intermittent rotary motion is provided by a rotary mechanism, and circumferential interval time and rotary angle are set; horizontal vibration, vertical vibration or compound vibration is provided by a vibration mechanism, and horizontal vibration frequency is set and horizontal amplitude , vertical vibration frequency and vertical amplitude .

[0010] Preferably, the excitation element is in a plane basic configuration, and the dimension parameters of the excitation element include the width of the excitation element and the length of the excitation element , the width of the excitation element Pitch to the large ring gear to be polished Related, and the value range is: ; Length of the excitation element The tooth width of the large gear ring to be polished Related, and the value range is: .

[0011] Preferably, the surface configuration of the excitation element further includes a topologically optimized surface with a unit material density of To optimize the variables, with minimum energy flexibility or minimum energy dissipation The topology optimization of the surface configuration of the excitation element is performed for the objective function: The unit material density optimization variables satisfy: The minimum energy flexibility objective function is: in, is the density penalty factor Next Material density of each node element; is the node energy density transposed vector; is the element stiffness matrix; is the node energy density vector; is the total number of unit nodes; The minimum energy dissipation objective function is: in, is the hysteresis damping coefficient; is the simple harmonic excitation frequency; The constraints are satisfied: in, is the element stiffness matrix, is the energy input excitation vector of the unit node, is the power flow vector of the unit node, is the energy density vector of the unit node, is the volume of the excitation element after topology optimization, To optimize the volume of the excitation element before topology optimization, is the lower limit of unit material density, usually taken as .

[0012] Preferably, the posture parameters of the excitation element include the deflection angle , rotation angle , Installation distance and installation height , where the deflection angle is defined The acute angle between the back surface of the excitation element at the initial position in the side view direction and the back surface of the excitation element after the position change; the rotation angle is defined as The acute angle between the backing surface of the excitation element at the initial position in the main viewing direction and the backing surface of the excitation element after the position is changed; define the installation distance The shortest horizontal distance between the end face of the excitation element in the initial position in the side view direction and the end face of the large gear ring to be polished on the same side; defines the installation height The shortest distance between the back surface of the excitation element at the initial position in the side view and the top circle of the large gear ring to be polished; Installation distance The tooth width of the large gear ring to be polished Related, and the value range is: ; Installation height With horizontal amplitude Related, and the value range is: .

[0013] Preferably, the processing medium consists of a rolling polishing block, water and abrasive fluid, and the filling height of the processing medium is defined as The distance between the upper end surface of the inner wall of the polishing container cavity and the free surface of the processing medium in the side view direction, the filling height The diameter of the large gear ring to be polished Related, and the value range is: .

[0014] Preferably, the polishing container is connected to the medium circulation equipment through the inlet and outlet, the processing medium is recovered to the medium circulation equipment through the outlet of the polishing container, the waste is discharged after screening, and the cleaned processing medium is loaded into the polishing container again through the inlet of the polishing container for use. The medium circulation equipment is provided with a medium replenishment channel connected to the inlet of the polishing container, so that the filling height of the processing medium in the polishing container is maintained within the required range for polishing; a base is provided between the polishing container and the recovery tank of the medium circulation equipment, and the base has a medium recovery channel connecting the two; two combined motion mechanisms are symmetrically arranged on both sides of the tooth surface of the large gear ring, two rotating mechanisms are symmetrically arranged on both sides of the central axis of the large gear ring, and the lifting mechanism and the rotating mechanism are both arranged at the upper end of the base.

[0015] Preferably, the steps for polishing the large gear ring to be polished are as follows: S1: Install the medium circulation device and the base on the polishing table, and install the polishing container, the combined motion mechanism and the rotary mechanism; S2: Install the large gear ring to be polished on the supporting cylindrical roller of the slewing mechanism; S3: placing the exciting element in the polishing container and connecting it to the vibration mechanism through the bridge section; S4: Covering the polishing and grinding container with a cover, and adding a preset amount of processing medium into the polishing and grinding container through a medium circulation device; S5: Start the lifting mechanism, feeding mechanism, vibration mechanism and rotary mechanism in sequence, and set the radial interval time and radial intermittent feed amount, axial interval time and axial intermittent feed amount, horizontal vibration frequency and horizontal amplitude , vertical vibration frequency and vertical amplitude As well as circumferential interval time and rotation angle; S6: After the preset processing time, the above mechanisms are closed in sequence according to the principle of opening first and closing later; S7: Recycle the processed medium into the medium circulation device; S8: Open the cover of the polishing container and take out the polished large gear ring.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention can apply a strong exciting force to a specific tooth surface part of a large gear ring in a targeted manner, localize and concentrate the energy for local polishing, and can also achieve consistent polishing of different parts of the tooth surface of the large gear ring in all directions at one time, thereby reducing the surface roughness of the large gear ring.

[0017] The large gear ring is placed vertically, with the tooth surface to be polished located at the bottom, which can reasonably utilize the kinetic energy and gravitational potential energy of the processing medium and improve the energy transfer efficiency.

[0018] The exciting element is driven by the multi-dimensional synergistic action of the axial intermittent feeding motion of the lifting mechanism, the radial intermittent feeding motion of the feeding mechanism, the circumferential intermittent rotary motion of the rotary mechanism and the reciprocating linear motion of the vibration mechanism to form a local forced particle flow field.

[0019] The excitation element with topologically optimized surface can guide the particle flow field in a specific area, so that the energy can be transferred more evenly to various parts of the tooth surface, especially the hard-to-reach areas such as the tooth root, thereby improving the medium accessibility and polishing uniformity in the tooth profile and tooth width direction, improving the processing efficiency, and achieving the purpose of finishing the tooth surface of large gear rings to be polished by reasonably adjusting the process parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the processing principle of the present invention (main viewing angle); Figure 2 yes Figure 1 A partial enlarged view of the middle A; Figure 3 is a schematic diagram of the processing principle of the present invention (side view); Figure 4 yes Figure 3 A partial enlarged view of point B in the middle; Figure 5 This is a schematic diagram of the topological optimization profile of the excitation element of the present invention. Figure 1 ; Figure 6 This is a schematic diagram of the topological optimization profile of the excitation element of the present invention. Figure 2 ; Figure 7 This is a schematic diagram of the topological optimization profile of the excitation element of the present invention. Figure 3 ; Figure 8 is a surface topography diagram of the gear ring before processing corresponding to Example 1 of the present invention; Fig. 9 is a surface topography diagram of the gear ring after processing corresponding to Example 1 of the present invention; Fig.10 is a surface topography image of the gear ring before processing corresponding to Example 2 of the present invention; Fig.11 It is a surface morphology diagram of the gear ring after processing corresponding to Example 2 of the present invention.

[0022] In the figure: 1-large gear ring; 2-processing medium; 3-polishing container; 4-lifting mechanism; 5-feeding mechanism; 6-rotating mechanism; 7-vibration mechanism; 8-excitation element; 9-medium circulation equipment; 10-base. DETAILED DESCRIPTION

[0023] In conjunction with the drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0024] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention. It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0025] Embodiment 1: like Figures 1 to 4As shown, a method for vertical local forced vibration polishing of a large wind turbine gear ring includes the following steps: placing the to-be-polished section of the large gear ring 1 to be polished in a polishing container 3 filled with a processing medium 2; driving the exciting element 8 in the processing medium 2 to perform a combination of radial intermittent feeding motion, axial intermittent feeding motion and reciprocating linear motion, and cooperating with the circumferential intermittent rotational motion of the large gear ring 1 to form a local forced particle flow field in the processing medium 2, and performing tooth surface finishing processing on the large gear ring 1 to be polished by reasonably adjusting the process parameters.

[0026] The above-mentioned radial intermittent feed motion, axial intermittent feed motion and circumferential intermittent rotary motion are all determined based on the geometric position of the large gear ring 1.

[0027] In this embodiment, the polishing container 3 is a trough-type structure, and a lifting mechanism 4, a feeding mechanism 5, a rotating mechanism 6 and a vibrating mechanism 7 are arranged outside the polishing container 3; wherein the vibrating mechanism 7, the feeding mechanism 5 and the lifting mechanism 4 are sequentially connected from top to bottom to form a combined motion mechanism for driving the vibration excitation element 8, and the vibration excitation element 8 is connected to the vibration mechanism 7 through a bridge-type section; the supporting cylindrical roller of the rotating mechanism 6 is in contact with the outer periphery of the large gear ring 1 for transmission; the large gear ring 1 is vertically arranged and the polishing section at its bottom is placed in the polishing container 3.

[0028] The lifting mechanism 4 is mainly composed of a motor, a slide rail, a lifting platform and a control module; the feeding mechanism 5 includes a motor, a screw and a guide device; the vibration mechanism 7 is composed of a vibration motor, an eccentric block, a shock absorbing device, etc.; the rotating mechanism 6 includes a supporting cylindrical roller, a rotating motor, a power device, a position sensor and a locking device, etc. Connection relationship: the lifting mechanism 4 drives the exciting element 8 to move up and down through the slide rail and the lifting platform; the feeding mechanism 5 transmits the axial movement to the exciting element 8 through the screw and the guide device; the vibration motor of the vibration mechanism 7 drives the eccentric block to rotate, generating a vibration force to directly drive the exciting element 8 to vibrate; the rotating mechanism 6 is in close contact with the outer periphery of the gear ring through the supporting rollers, and the rotating motor drives the supporting rollers on one side through the power device. The position sensor is used to detect the position of the gear ring in real time. The locking device fixes the gear ring after each intermittent rotation to prevent displacement and ensure the consistency of polishing. The specific internal structures of the above mechanisms are all existing technologies and will not be repeated here.

[0029] Provide radial intermittent feeding motion through the lifting mechanism 4, and set the radial interval time and radial intermittent feed , radial interval time The range is , radial intermittent feed Range , in this embodiment, the radial interval time , radial intermittent feed ; The axial intermittent feeding motion is provided by the feeding mechanism 5, and the axial interval time is set and axial intermittent feed , axial interval time The range is , axial intermittent feed Range , in this embodiment, the axial interval time , axial intermittent feed ; The circumferential intermittent rotational motion is provided by the rotation mechanism 6, and the circumferential interval time is set and rotation angle , circumferential interval time The range is , interval angle The range is , in this embodiment, the circumferential interval time , rotation angle ; The vibration mechanism 7 provides horizontal vibration, vertical vibration or combined vibration, and is provided with a horizontal vibration frequency. and horizontal amplitude , vertical vibration frequency and vertical amplitude In this embodiment, the vibration mechanism 7 is used to provide horizontal vibration and vertical vibration. The horizontal vibration frequency and horizontal amplitude , vertical vibration frequency and vertical amplitude .

[0030] The excitation element 8 is basically in a plane configuration, and the dimensional parameters of the excitation element 8 include the width of the excitation element and the length of the excitation element , the width of the excitation element Pitch to the large ring gear to be polished Related, and the value range is: In this embodiment, the width of the excitation element is selected ; Length of the excitation element The tooth width of the large gear ring to be polished Related, and the value range is: In this embodiment, the length of the excitation element is selected .

[0031] like Figures 5 to 7 As shown, the surface configuration of the excitation element 8 also includes a topologically optimized surface with a unit material density of To optimize the variables, the minimum energy flexibility or minimum energy dissipation The topology optimization of the surface configuration of the excitation element 8 is performed as the objective function: The unit material density optimization variables satisfy: The minimum energy flexibility objective function is: in, is the density penalty factor Next Material density of each node element; is the node energy density transposed vector; is the element stiffness matrix; is the node energy density vector; is the total number of unit nodes; The minimum energy dissipation objective function is: in, is the hysteresis damping coefficient; is the simple harmonic excitation frequency; The constraints are satisfied: in, is the element stiffness matrix, is the energy input excitation vector of the unit node, is the power flow vector of the unit node, is the energy density vector of the unit node, is the volume of the excitation element after topology optimization, To optimize the volume of the excitation element before topology optimization, is the lower limit of unit material density, usually taken as .

[0032] The influence of topologically optimized profile on smooth gear ring: (1) Improve the energy transfer efficiency between particle layers: Topological optimization achieves maximum energy transfer by optimizing the surface structure and material distribution of the excitation element 8, ensuring that the excitation force can be evenly distributed in the processing medium, so that each layer of particles can fully absorb and utilize the transferred energy. It enhances the fluidity of the particle layer and ensures that the energy transfer efficiency from the excitation element 8 to the processing medium and then to the gear ring is maximized during the processing.

[0033] (2) Reduce energy dissipation: Traditional planar configuration design may have large internal energy loss and structural vibration instability, resulting in a reduction in the effective energy transferred to the medium. Topology optimization improves mass distribution by reducing unnecessary material distribution, reduces energy loss caused by structural deformation or damping, and enables energy to act more effectively on the processing medium.

[0034] (3) Reduce the mass of the excitation component: Traditional excitation elements often require greater energy to drive their movement because they are not optimized. Topological optimization can not only maintain sufficient rigidity and strength by rationally distributing the use of materials, but also effectively reduce the overall mass of the excitation element 8 to stimulate the same or even higher vibration amplitude with lower energy. The materials are mainly distributed in key locations that can improve energy transfer efficiency, reduce the load on processing equipment, extend the service life of the equipment, and reduce maintenance costs.

[0035] In addition, the energy input to the system Width of the excitation element and length Related to, satisfying: in, for The work done by the exciting force in a cycle is is the vibration acceleration, is the excitation amplitude, For the exciting force, is the amplitude phase difference, is the proportionality coefficient, is the processing medium diameter, is the filling height, is the mass of a single processing medium, is the excitation frequency, is the excitation time, is the excitation period, It is the displacement of the processing medium in the vibration direction of the exciting element.

[0036] The excitation element 8 also includes a deflection angle , rotation angle , Installation distance and installation height Equivalent pose parameters, which define the deflection angle The acute angle between the back surface of the excitation element at the initial position in the side view direction and the back surface of the excitation element after the position is changed. In this embodiment, the deflection angle is ; Define the rotation angle The acute angle between the back surface of the excitation element at the initial position in the main viewing direction and the back surface of the excitation element after the position is changed. In this embodiment, the deflection angle is taken as ; Define the installation distance The shortest horizontal distance between the end face of the excitation element in the initial position in the side view direction and the end face of the large gear ring to be polished on the same side; defines the installation height The shortest distance between the back surface of the excitation element at the initial position in the side view and the top circle of the large gear ring to be polished; Installation distance The tooth width of the large gear ring to be polished Related, and the value range is: , in this embodiment, the installation distance is ; Installation height With horizontal amplitude Related, and the value range is: In this embodiment, the installation height is .

[0037] Processing medium 2 consists of a spherical rolling polishing block with a diameter of 5 mm, water and HA-PC grinding fluid, defining the filling height of processing medium 2 The filling height is the distance between the upper end surface of the inner wall of the polishing container cavity in the side view and the free surface of the processing medium. The diameter of the large gear ring to be polished Related, and the value range is: In this embodiment, the filling height .

[0038] The polishing container 3 is connected to the medium circulation device 9 through the inlet and outlet ports, the processing medium 2 is recovered to the medium circulation device 9 through the outlet port of the polishing container 3, the waste is discharged after screening, and the cleaned processing medium 2 is loaded into the polishing container 3 again through the inlet port of the polishing container 3 for use. The medium circulation device 9 is provided with a medium replenishment channel connected to the inlet port of the polishing container 3, so that the filling height of the processing medium 2 in the polishing container 3 is maintained within the required range for polishing; a base 10 is provided between the polishing container 3 and the recovery groove of the medium circulation device 9, and the base 10 has a medium recovery channel connecting the two; two combined motion mechanisms are symmetrically arranged on both sides of the tooth surface of the large gear ring 1, two rotating mechanisms 6 are symmetrically arranged on both sides of the central axis of the large gear ring 1, and the lifting mechanism 4 and the rotating mechanism 6 are both arranged at the upper end of the base 10.

[0039] The steps for polishing the large gear ring 1 to be polished are as follows: S1: Install the medium circulation device 9 and the base 10 on the polishing table, and install the polishing container 3, the combined motion mechanism and the rotary mechanism 6; S2: Install the large gear ring 1 to be polished on the supporting cylindrical roller of the rotary mechanism 6; S3: placing the excitation element 8 in the polishing container 3 and connecting it to the vibration mechanism 7 via a bridge section; S4: Cover the polishing container 3 with a lid, and add a preset amount of processing medium 2 into the polishing container 3 through the medium circulation device 9; S5: Start the lifting mechanism 4, feeding mechanism 5, vibration mechanism 7 and rotary mechanism 6 in sequence, and set the radial interval time and radial intermittent feeding amount, axial interval time and axial intermittent feeding amount, horizontal vibration frequency and horizontal amplitude , vertical vibration frequency and vertical amplitude As well as circumferential interval time and rotation angle; S6: After the preset processing time, the above mechanisms are closed in sequence according to the principle of opening first and closing later; S7: Recycling the processed medium 2 into the medium circulation device 9; S8: Open the cover of the polishing container 3 and take out the polished large gear ring 1.

[0040] Processing effect: like Figure 8 , Fig. 9 As shown in the figure, after adopting a vertical local forced vibration polishing method for a large wind turbine gear ring, the gear ring tooth surface is processed evenly and the surface texture tends to be isotropic. The average roughness value of the tooth surface is Down to .

[0041] Embodiment 2: The difference between Example 2 and Example 1 is that the deflection angle , the rotary mechanism 6 provides an interval rotary motion, and in this embodiment, the circumferential interval time is selected , rotation angle .

[0042] Processing effect: like Fig.10 , Fig.11 As shown in the figure, after adopting a vertical local forced vibration polishing method for a large wind turbine gear ring, the gear ring tooth surface is processed evenly and the surface texture tends to be isotropic. The average roughness value of the tooth surface is Down to .

[0043] The present invention adopts local forced vibration, and the energy is concentrated in the vibration area. The forced vibration mechanism directly acts on the part to be polished, which can achieve efficient and targeted processing and ensure the effective use of energy and the improvement of processing quality.

[0044] In traditional distributed vibration, the excitation force depends on the synergistic effect of multiple excitation points, and the energy is distributed over a larger range. It is suitable for overall processing, but it may lead to insufficient energy transfer efficiency and affect the uniformity and consistency of processing.

[0045] Compared with distributed excitation, the advantages of local forced excitation are: (1) Improve the flexibility of targeted processing: Vertical local forced vibration can be used for targeted polishing of specific tooth surface areas of large gear rings 1. The excitation element 8 directly applies a strong excitation force to the gear ring area to be processed, forming a local energy concentration, increasing the kinetic energy and fluidity of the particle medium group, and significantly enhancing the interaction force between the particle media, thereby improving the polishing effect.

[0046] (2) Topological optimization of the excitation element surface: In distributed excitation, the traditional planar excitation element design often results in uneven local energy transfer during the vibration of medium particles, especially when the particle flow is restricted, the energy cannot be fully transferred to the deep part of the tooth surface. The topologically optimized excitation element 8 can guide the particle flow field in a specific area, so that the energy can be more evenly transferred to various parts of the tooth surface, especially in hard-to-reach areas such as the tooth root, ensuring uniform finishing of the entire tooth surface.

[0047] (3) Multi-dimensional movement synergy: Vertical local forced vibration utilizes the synergistic effect of multi-dimensional motion to greatly improve the polishing efficiency. The axial intermittent feeding of the lifting mechanism, the circumferential intermittent rotation of the rotary mechanism, and the radial reciprocating linear motion of the vibration mechanism can effectively generate a forced particle flow field and improve the polishing efficiency.

[0048] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A vertical local forced vibration polishing method for a large wind turbine gear ring, characterized in that: The following steps are involved: Placing the section of a large gear ring (1) to be polished in a polishing container (3) containing a processing medium (2); The excitation element (8) in the processing medium (2) is driven to perform a combination of radial intermittent feed motion, axial intermittent feed motion and reciprocating linear motion, and the circumferential intermittent rotary motion of the large gear ring (1) is coordinated to form a local forced particle flow field in the processing medium (2), and the tooth surface of the large gear ring (1) to be polished is polished.

2. A vertical local forced vibration polishing method for a large wind turbine gear ring according to claim 1, characterized in that: The radial intermittent feed motion, the axial intermittent feed motion and the circumferential intermittent rotary motion are all determined based on the geometric position of the large gear ring (1).

3. A vertical local forced vibration polishing method for a large wind turbine gear ring according to claim 1, characterized in that: The polishing container (3) is a trough-shaped structure, and a lifting mechanism (4), a feeding mechanism (5), a rotating mechanism (6) and a vibrating mechanism (7) are arranged outside the polishing container (3); wherein the vibrating mechanism (7), the feeding mechanism (5) and the lifting mechanism (4) are sequentially connected from top to bottom to form a combined motion mechanism for driving an exciting element (8), and the exciting element (8) is connected to the vibration mechanism (7) via a bridge-shaped section; the supporting cylindrical roller of the rotating mechanism (6) is in contact with the outer periphery of the large gear ring (1) for transmission; the large gear ring (1) is arranged vertically and the section to be polished at the bottom thereof is placed in the polishing container (3).

4. A vertical local forced vibration polishing method for a large wind turbine gear ring according to claim 3, characterized in that: The lifting mechanism (4) provides radial intermittent feeding motion, and the radial interval time and radial intermittent feeding amount are set; the feeding mechanism (5) provides axial intermittent feeding motion, and the axial interval time and axial intermittent feeding amount are set; the rotary mechanism (6) provides circumferential intermittent rotary motion, and the circumferential interval time and rotary angle are set; the vibration mechanism (7) provides horizontal vibration, vertical vibration or combined vibration, and the horizontal vibration frequency is set. and horizontal amplitude , vertical vibration frequency and vertical amplitude .

5. A vertical local forced vibration polishing method for a large wind turbine gear ring according to claim 1, characterized in that: The excitation element (8) is basically in a plane configuration, and the dimensional parameters of the excitation element (8) include the width of the excitation element and the length of the excitation element , the width of the excitation element Pitch to the large ring gear to be polished Related, and the value range is: ; Length of the excitation element The tooth width of the large gear ring to be polished Related, and the value range is: .

6. A vertical local forced vibration polishing method for a large wind turbine gear ring according to claim 5, characterized in that: The surface configuration of the excitation element (8) also includes a topologically optimized surface, with a unit material density To optimize the variables, the minimum energy flexibility or minimum energy dissipation The topology optimization of the surface configuration of the excitation element (8) is performed for the objective function: The unit material density optimization variables satisfy: The minimum energy flexibility objective function is: in, is the density penalty factor Next Material density of each node element; is the node energy density transposed vector; is the element stiffness matrix; is the node energy density vector; is the total number of unit nodes; The minimum energy dissipation objective function is: in, is the hysteresis damping coefficient; is the simple harmonic excitation frequency; The constraints are satisfied: in, is the element stiffness matrix, is the energy input excitation vector of the unit node, is the power flow vector of the unit node, is the energy density vector of the unit node, is the volume of the excitation element after topology optimization, To optimize the volume of the excitation element before topology optimization, is the lower limit of unit material density, usually taken as .

7. A vertical local forced vibration polishing method for a large wind turbine gear ring according to claim 5, characterized in that: The posture parameters of the excitation element (8) include the deflection angle , rotation angle , Installation distance and installation height , where the deflection angle is defined The acute angle between the back surface of the excitation element at the initial position in the side view direction and the back surface of the excitation element after the position change; the rotation angle is defined as The acute angle between the backing surface of the excitation element at the initial position in the main viewing direction and the backing surface of the excitation element after the position is changed; define the installation distance The shortest horizontal distance between the end face of the excitation element in the initial position in the side view direction and the end face of the large gear ring to be polished on the same side; defines the installation height The shortest distance between the back surface of the excitation element at the initial position in the side view and the top circle of the large gear ring to be polished; Installation distance The tooth width of the large gear ring to be polished Related, and the value range is: ; Installation height With horizontal amplitude Related, and the value range is: .

8. A vertical local forced vibration polishing method for a large wind turbine gear ring according to claim 1, characterized in that: The processing medium (2) consists of a grinding block, water and abrasive fluid, which defines the filling height of the processing medium (2). The distance between the upper end surface of the inner wall of the cavity of the polishing container in the side view and the free surface of the processing medium, the filling height The diameter of the large gear ring to be polished Related, and the value range is: .

9. A vertical local forced vibration polishing method for a large wind turbine gear ring according to claim 3, characterized in that: The polishing container (3) is connected to a medium circulation device (9) through an inlet and an outlet. The processing medium (2) is recovered into the medium circulation device (9) through the outlet of the polishing container (3), and waste is discharged after screening. At the same time, the cleaned processing medium (2) is again loaded into the polishing container (3) through the inlet of the polishing container (3) for use. The medium circulation device (9) is provided with a medium replenishing channel connected to the inlet of the polishing container (3), so that the filling height of the processing medium (2) in the polishing container (3) is maintained within the required range for polishing. A base (10) is provided between the polishing container (3) and the recovery groove of the medium circulation device (9), and the base (10) has a medium recovery channel connecting the two. Two combined motion mechanisms are symmetrically arranged on both sides of the tooth surface of the large gear ring (1), two rotary mechanisms (6) are symmetrically arranged on both sides of the central axis of the large gear ring (1), and the lifting mechanism (4) and the rotary mechanism (6) are both arranged at the upper end of the base (10).

10. A vertical local forced vibration polishing method for a large wind turbine gear ring according to claim 9, characterized in that: The steps for polishing the large gear ring (1) to be polished are as follows: S1: Install the medium circulation device (9) and the base (10) on the polishing table, and install the polishing container (3), the combined motion mechanism and the rotary mechanism (6); S2: Mounting the large gear ring (1) to be polished on the supporting cylindrical roller of the slewing mechanism (6); S3: placing the excitation element (8) in the polishing container (3) and connecting it to the vibration mechanism (7) via a bridge section; S4: closing the cover of the polishing container (3), and adding a preset amount of processing medium (2) into the polishing container (3) through the medium circulation device (9); S5: Start the lifting mechanism (4), feeding mechanism (5), vibration mechanism (7) and rotary mechanism (6) in sequence, and set the radial interval time and radial intermittent feed amount, axial interval time and axial intermittent feed amount, horizontal vibration frequency and horizontal amplitude , vertical vibration frequency and vertical amplitude As well as circumferential interval time and rotation angle; S6: After the preset processing time has passed, the rotary mechanism (6), the vibrating mechanism (7), the feeding mechanism (5) and the lifting mechanism (4) are closed in sequence according to the principle of opening first and closing later; S7: recycling the processing medium (2) into the medium circulation device (9); S8: Open the cover of the polishing container (3) and take out the polished large gear ring (1).

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