A vertical local forced vibration polishing method for large wind turbine gear ring

Abstract

The present invention belongs to the technical field of surface finishing of mechanical parts, and aims to solve the problem that traditional rolling finishing is difficult to meet the high precision and uniformity requirements of large wind turbine gear rings. A vertical local forced vibration polishing method for large wind turbine gear rings is provided, comprising the following steps: placing the to-be-polished section of the large gear ring to be polished in a polishing container filled with a processing medium; driving the exciting element in the processing medium 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 to form a local forced particle flow field in the processing medium, and perform tooth surface finishing processing on the large gear ring to be polished. The present invention can apply a strong exciting force to a specific tooth surface part of a large gear ring in a targeted manner, and perform local polishing in a centralized manner. It can also achieve consistent polishing of different parts of the tooth surface of a large gear ring at one time and in all directions, and can reduce the surface roughness of the large gear ring.

Description

Technical Field

[0001] This invention belongs to the field of surface finishing technology for mechanical parts, specifically relating to a vertical local forced vibration polishing method for large wind turbine gear rings. Background Technology

[0002] The trends in wind power equipment development include larger wind turbine units, lighter core components, self-sufficiency in key technologies, intelligent industrial development, and flexible manufacturing processes. High-power-density gearboxes represent a crucial direction for the future expansion of wind turbine units, with urgent market demand. To increase power density, the design of core components such as gear rings approaches their load-bearing limits, making them more prone to failure. The surface integrity after processing using existing manufacturing processes severely impacts the reliability and lifespan of large wind turbine gear rings, becoming a weak point in large wind turbine gearboxes.

[0003] Wind turbines are installed in windy locations such as mountains, wilderness, beaches, and islands, subjected to unpredictable wind forces with varying directions and loads, as well as the impact of strong gusts. They are also constantly exposed to extreme heat and cold and extreme temperature differences. This harsh environment makes the gearboxes installed in the confined space at the top of the tower highly susceptible to failure, and repair is extremely difficult. Timely prevention and efficient maintenance are therefore crucial. Failure modes of wind turbine gear rings include various typical damage types such as micropitting, abrasive wear, foreign object damage, surface corrosion, and contact corrosion. Traditional finishing methods often involve gear grinding, but grinding technology is complex and costly. Furthermore, gear rings that have undergone nitriding treatment cannot be repaired by grinding after failure and must be scrapped. The national standard stipulates that the upper limit for the surface roughness of wind turbine gear rings is 1.6. The maximum accuracy level is 7, and the accuracy level of the wind turbine gear ring after nitriding can be reduced to 8 in terms of runout and cumulative total pitch deviation.

[0004] The large module, numerous teeth, deep tooth grooves, and heavy weight of wind turbine gear rings present significant processing challenges, as traditional grinding finishing methods struggle to meet their high precision and uniformity requirements. Furthermore, traditional finishing processes such as gear grinding face limitations in processing nitrided wind turbine gear rings. Summary of the Invention

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

[0006] This invention is achieved using the following technical solution: a vertical localized forced vibration polishing method for large wind turbine gear rings, comprising the following steps:

[0007] The section of the large gear ring to be polished is placed in a polishing container containing processing media.

[0008] The excitation element in the driving medium performs a combination of radial intermittent feed motion, axial intermittent feed motion, and reciprocating linear motion, and cooperates with the circumferential intermittent rotational motion of the large gear ring to form a localized forced particle flow field in the processing medium, and performs tooth surface finishing on the large gear ring to be polished.

[0009] Preferably, the aforementioned 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.

[0010] Preferably, the polishing container has a trough-shaped structure, and a lifting mechanism, a feeding mechanism, a rotating mechanism, and a vibration mechanism are provided outside the polishing container; wherein the vibration mechanism, the feeding mechanism, and the lifting mechanism are connected sequentially from top to bottom to form a combined motion mechanism for driving the excitation element, and the excitation element is connected to the vibration mechanism through a bridge-shaped section; the supporting cylindrical roller of the rotating mechanism is in contact with the outer circumference 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.

[0011] Preferably, a lifting mechanism provides radial intermittent feed motion, and sets the radial interval time and radial intermittent feed amount; a feeding mechanism provides axial intermittent feed motion, and sets the axial interval time and axial intermittent feed amount; a rotary mechanism provides circumferential intermittent rotary motion, and sets the circumferential interval time and rotary angle; a vibration mechanism provides horizontal vibration, vertical vibration, or combined vibration, and sets a horizontal vibration frequency. and horizontal amplitude Vertical vibration frequency and vertical amplitude .

[0012] Preferably, the excitation element has a planar basic configuration, and the dimensional parameters of the excitation element include the width of the excitation element. and the length of the excitation element Width of the excitation element Pitch with the large gear ring to be polished Related, and the range of values ​​is: ; length of the excitation element Tooth width of the large gear ring to be polished Related, and the range of values ​​is: .

[0013] Preferably, the surface configuration of the excitation element further includes a topology-optimized surface, with a unit material density. To optimize variables, with minimum energy compliance or minimum energy dissipation Topology optimization of the surface configuration of the excitation element for the objective function:

[0014] The optimization variables for the unit material density satisfy:

[0015]

[0016] The minimum energy compliance objective function is:

[0017]

[0018] in, Density penalty factor Next Material density of each node element; The transpose of the node energy density; The element stiffness matrix; The node energy density vector; This represents the total number of unit nodes.

[0019] The objective function for minimizing energy dissipation is:

[0020]

[0021] in, The hysteresis damping coefficient; The frequency is the simple harmonic excitation frequency;

[0022] The constraints are satisfied:

[0023]

[0024] in, The element stiffness matrix, The energy input excitation vector for the unit node. This represents the power flow vector of the unit node. The energy density vector of the unit node. The volume of the excitation element after topology optimization. The volume of the excitation element before topology optimization. The lower limit of the unit material density is usually taken as... .

[0025] Preferably, the orientation parameters of the excitation element include the deflection angle. Rotation angle Installation distance and installation height The deflection angle is defined therein. The acute angle between the back surface of the excitation element at its initial position in the side-view direction and the back surface of the excitation element after its position change is defined; the rotation angle is defined. The acute angle between the back surface of the excitation element at its initial position in the main viewing direction and the back surface of the excitation element after its position change; defining the installation distance. The shortest horizontal distance between the end face of the excitation element at its initial position in the side view direction and the same-side end face of the large gear ring to be polished; defining the installation height. The shortest distance between the back surface of the excitation element at its initial position in the side view direction and the tip circle of the large gear ring to be polished; installation distance. Tooth width of the large gear ring to be polished Related, and the range of values ​​is: Installation height With horizontal amplitude Related, and the range of values ​​is: .

[0026] Preferably, the processing medium consists of a tumbling polishing block, water, and polishing fluid, and the filling height of the processing medium is defined. The distance between the upper end face of the inner wall of the polishing container cavity and the free surface of the processing medium in the side-view direction is the filling height. With the diameter of the large gear ring to be polished Related, and the range of values ​​is: .

[0027] Preferably, the polishing container is connected to a media circulation device through its inlet and outlet. The processing media is recycled to the media circulation device through the outlet of the polishing container. After screening, the waste is discharged. At the same time, the cleaned processing media is refilled into the polishing container through its inlet for later use. The media circulation device is provided with a media replenishment channel that communicates with the inlet of the polishing container, so that the filling height of the processing media in the polishing container is maintained within the range required for polishing. A base is provided between the polishing container and the recovery tank of the media circulation device, and the base has a media recovery channel that connects the two. Two combined motion mechanisms are symmetrically arranged on both sides of the tooth surface of the large gear ring, and two rotary mechanisms are symmetrically arranged on both sides of the central axis of the large gear ring. The lifting mechanism and the rotary mechanism are both located on the upper end of the base.

[0028] Preferably, the polishing steps for the large gear ring to be polished are as follows:

[0029] S1: Install the media circulation equipment and base on the polishing table, and install the polishing container, combined motion mechanism and rotary mechanism;

[0030] S2: Install the large gear ring to be polished on the supporting cylindrical roller of the rotary mechanism;

[0031] S3: Place the excitation element in the polishing container and connect it to the vibration mechanism through a bridge section;

[0032] S4: Cover the polishing container with the lid and add the preset amount of processing medium into the polishing container through the medium circulation device;

[0033] S5: Sequentially start the lifting mechanism, feeding mechanism, vibration mechanism, and rotary mechanism, and set the radial interval time, radial intermittent feed amount, axial interval time, axial intermittent feed amount, and horizontal vibration frequency. and horizontal amplitude Vertical vibration frequency and vertical amplitude And the circumferential interval time and rotation angle;

[0034] S6: After the preset processing time, the above mechanisms will be closed in sequence according to the principle of opening first and closing last;

[0035] S7: Recycle the processing medium into the medium circulation equipment;

[0036] S8: Open the cover of the polishing container and take out the polished large gear ring.

[0037] Compared with the prior art, the beneficial effects of the present invention are:

[0038] This invention can apply strong excitation force to a specific tooth surface of a large gear ring, localizing and concentrating energy for local polishing, and can also achieve uniform polishing of different parts of the tooth surface of a large gear ring in one go, thereby reducing the surface roughness of the large gear ring.

[0039] The large gear ring is placed vertically, with the tooth surface to be polished located at the bottom. This allows for the efficient use of the kinetic energy and gravitational potential energy of the processing medium, thereby improving energy transfer efficiency.

[0040] The excitation element is driven by the multi-dimensional synergistic action of the lifting mechanism's axial intermittent feed motion, the feeding mechanism's radial intermittent feed motion, the rotary mechanism's circumferential intermittent rotary motion, and the vibration mechanism's reciprocating linear motion, forming a locally forced particle flow field.

[0041] The excitation element with topology-optimized surface can guide the particle flow field in a specific area, so that energy can be transferred more evenly to all parts of the tooth surface, especially areas that are difficult to reach, such as the tooth root. This improves the accessibility of the medium in the tooth profile and tooth width directions and the uniformity of polishing, thereby improving processing efficiency. By reasonably controlling the process parameters, the goal of finishing the tooth surface of large gear rings to be polished can be achieved. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1This is a schematic diagram of the processing principle of the present invention (from the front view).

[0044] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0045] Figure 3 This is a schematic diagram of the processing principle of the present invention (side view).

[0046] Figure 4 yes Figure 3 A magnified view of a section at point B in the middle;

[0047] Figure 5 This is a schematic diagram of the topology optimization surface of the excitation element of the present invention. Figure 1 ;

[0048] Figure 6 This is a schematic diagram of the topology optimization surface of the excitation element of the present invention. Figure 2 ;

[0049] Figure 7 This is a schematic diagram of the topology optimization surface of the excitation element of the present invention. Figure 3 ;

[0050] Figure 8 This is a surface topography diagram of the gear ring before machining, corresponding to Embodiment 1 of the present invention;

[0051] Figure 9 This is a surface morphology diagram of the gear ring after machining, corresponding to Embodiment 1 of the present invention;

[0052] Figure 10 This is a surface morphology diagram of the gear ring before machining, corresponding to Embodiment 2 of the present invention;

[0053] Figure 11 This is a surface morphology diagram of the gear ring after machining, corresponding to Embodiment 2 of the present invention.

[0054] In the diagram: 1-Large gear ring; 2-Processing medium; 3-Polishing container; 4-Lifting mechanism; 5-Feeding mechanism; 6-Rotation mechanism; 7-Vibration mechanism; 8-Excitation element; 9-Media circulation equipment; 10-Base. Detailed Implementation

[0055] The technical solutions of the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0056] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should fall within the scope of the technical content disclosed in 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.

[0057] Example 1:

[0058] like Figures 1 to 4 As shown, a vertical localized forced vibration polishing method for large wind turbine gear rings includes the following steps: placing the polishing section of the large gear ring 1 to be polished in a polishing container 3 containing a processing medium 2; driving the excitation element 8 in the processing medium 2 to perform a combination of radial intermittent feed motion, axial intermittent feed motion, and reciprocating linear motion, and coordinating with the circumferential intermittent rotational motion of the large gear ring 1, forming a localized forced particle flow field in the processing medium 2; and performing tooth surface finishing on the large gear ring 1 to be polished by reasonably controlling the process parameters.

[0059] The aforementioned 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.

[0060] In this embodiment, the polishing container 3 has a trough-shaped structure, and a lifting mechanism 4, a feeding mechanism 5, a rotating mechanism 6, and a vibration mechanism 7 are provided outside the polishing container 3. The vibration mechanism 7, the feeding mechanism 5, and the lifting mechanism 4 are connected sequentially from top to bottom to form a combined motion mechanism for driving the excitation element 8, and the excitation element 8 is connected to the vibration mechanism 7 through 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 vertically arranged and the section to be polished at its bottom is placed in the polishing container 3.

[0061] The lifting mechanism 4 mainly consists of a motor, slide rail, lifting platform, and control module; the feeding mechanism 5 includes a motor, lead screw, and guide device; the vibration mechanism 7 consists of a vibration motor, eccentric block, and damping device; the rotary mechanism 6 includes supporting cylindrical rollers, rotary motor, power unit, position sensor, and locking device. Connection relationship: The lifting mechanism 4 drives the excitation element 8 to move up and down via the slide rail and lifting platform; the feeding mechanism 5 transmits axial motion to the excitation element 8 via the lead screw and guide device; the vibration motor of the vibration mechanism 7 drives the eccentric block to rotate, generating vibration force that directly drives the excitation element 8 to vibrate; the rotary mechanism 6 maintains close contact between the supporting rollers and the outer circumference of the gear ring, the rotary motor drives the supporting rollers on one side via the power unit, the position sensor is used to detect the position of the gear ring in real time, and the locking device fixes the gear ring after each intermittent rotation to prevent displacement and ensure consistent polishing. The specific internal structures of the above mechanisms are all existing technologies and will not be described in detail here.

[0062] Radial intermittent feed motion is provided by lifting mechanism 4, and the radial interval time is set. and radial intermittent feed rate Radial interval time The range is Radial intermittent feed rate Scope In this embodiment, the radial interval time Radial intermittent feed rate ;

[0063] The feed mechanism 5 provides intermittent axial feed motion, and the axial interval time is set. and axial intermittent feed axial interval time The range is Axial intermittent feed rate Scope In this embodiment, the axial interval time Axial intermittent feed rate ;

[0064] The circumferential intermittent circumferential ... motion is provided by the slewing 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 ;

[0065] The vibration mechanism 7 provides horizontal vibration, vertical vibration, or a combination of vibrations, and is equipped 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 and vertical vibration, with the horizontal vibration frequency being... and horizontal amplitude Vertical vibration frequency and vertical amplitude .

[0066] The excitation element 8 has a basic planar configuration, and its dimensional parameters include the width of the excitation element. and the length of the excitation element Width of the excitation element Pitch with the large gear ring to be polished Related, and the range of values ​​is: In this embodiment, the width of the excitation element is selected. ; length of the excitation element Tooth width of the large gear ring to be polished Related, and the range of values ​​is: In this embodiment, the length of the excitation element is selected. .

[0067] like Figures 5 to 7 As shown, the surface configuration of the excitation element 8 also includes a topology-optimized surface, with a unit material density. To optimize variables, with minimum energy compliance or minimum energy dissipation Topology optimization of the surface configuration of excitation element 8 for the objective function:

[0068] The optimization variables for the unit material density satisfy:

[0069]

[0070] The minimum energy compliance objective function is:

[0071]

[0072] in, Density penalty factor Next Material density of each node element; The node energy density transpose vector; The element stiffness matrix; The node energy density vector; This represents the total number of unit nodes;

[0073] The objective function for minimizing energy dissipation is:

[0074]

[0075] in, The hysteresis damping coefficient; The frequency is the simple harmonic excitation frequency;

[0076] The constraints are satisfied:

[0077]

[0078] in, The element stiffness matrix, The energy input excitation vector for the unit node. This represents the power flow vector of the unit node. The energy density vector of the unit node. The volume of the excitation element after topology optimization. The volume of the excitation element before topology optimization. The lower limit of the unit material density is usually taken as... .

[0079] The effect of topology optimization on the surface of the smooth gear ring:

[0080] (1) Improve the energy transfer efficiency between particle layers:

[0081] Topology optimization maximizes energy transfer by optimizing the surface structure and material distribution of the excitation element 8, ensuring that the excitation force is uniformly distributed in the machining medium, allowing each particle layer to fully absorb and utilize the transferred energy. This enhances the fluidity of the particle layer, ensuring that the energy transfer efficiency from the excitation element 8 to the machining medium and then to the gear ring is maximized during machining.

[0082] (2) Reduce energy dissipation:

[0083] Traditional planar configuration designs may suffer from significant internal energy losses and structural vibration instabilities, resulting in a reduction in the effective energy transferred to the processing medium. Topology optimization improves mass distribution by reducing unnecessary material distribution, thereby minimizing energy losses due to structural deformation or damping and allowing energy to be applied more effectively to the processing medium.

[0084] (3) Reduce the mass of the excitation element:

[0085] Traditional excitation elements, due to their lack of optimized design, often require greater energy to drive their motion. Topology optimization, through the rational allocation of materials, can not only maintain sufficient stiffness and strength, but also effectively reduce the overall mass of the excitation element 8 to excite the same or even higher vibration amplitude with lower energy. By distributing materials mainly in key parts that can improve energy transfer efficiency, the load on processing equipment is reduced, the service life of the equipment is extended, and maintenance costs are lowered.

[0086] In addition, the energy input to the system Width of the excitation element and length Relevant to, satisfying:

[0087]

[0088] in, for The work done by the excitation force within one cycle For vibration acceleration, For the excitation amplitude, For excitation force, For amplitude and phase difference, This is the proportionality coefficient. For the diameter of the processing medium, To fill height, For the mass of a single processing medium, The excitation frequency, For excitation time, For the excitation period, This refers to the displacement of the processing medium in the vibration direction of the excitation element.

[0089] The excitation element 8 also includes a deflection angle. Rotation angle Installation distance and installation height Equivalent pose parameters, where the deflection angle is defined. The acute angle between the back surface of the excitation element at its initial position in the side-view direction and the back surface of the excitation element after its position change is taken as the deflection angle in this embodiment. Define 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 change is taken as the deflection angle in this embodiment. Define installation distance The shortest horizontal distance between the end face of the excitation element at its initial position in the side view direction and the same-side end face of the large gear ring to be polished; defining the installation height. The shortest distance between the back surface of the excitation element at its initial position in the side view direction and the tip circle of the large gear ring to be polished; installation distance. Tooth width of the large gear ring to be polished Related, and the range of values ​​is: In this embodiment, the installation distance is taken as... Installation height With horizontal amplitude Related, and the range of values ​​is: In this embodiment, the installation height is taken as... .

[0090] Processing media 2 consists of 5mm diameter spherical polishing blocks, water, and HA-PC slurry, with the filling height of processing media 2 defined. The distance between the upper end face of the inner wall of the polishing container cavity and the free surface of the processing medium in the side-view direction is the filling height. With the diameter of the large gear ring to be polished Related, and the range of values ​​is: In this embodiment, the fill height .

[0091] The polishing container 3 is connected to the media circulation device 9 through the inlet and outlet. The processing medium 2 is recycled to the media circulation device 9 through the outlet of the polishing container 3. After screening, the waste material is discharged. At the same time, the cleaned processing medium 2 is loaded back into the polishing container 3 through the inlet for use. The media circulation device 9 is provided with a media replenishment channel that communicates with 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 range required for polishing. A base 10 is provided between the polishing container 3 and the recovery tank of the media circulation device 9, and the base 10 has a media recovery channel that connects the two. Two combined motion mechanisms are symmetrically arranged on both sides of the tooth surface of the large gear ring 1, and two rotary mechanisms 6 are symmetrically arranged on both sides of the central axis of the large gear ring 1. The lifting mechanism 4 and the rotary mechanism 6 are both located on the upper end of the base 10.

[0092] The polishing steps for the large gear ring 1 to be polished are as follows:

[0093] S1: Install the media 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;

[0094] S2: Install the large gear ring 1 to be polished on the supporting cylindrical roller of the rotary mechanism 6;

[0095] S3: Place the excitation element 8 in the polishing container 3 and connect it to the vibration mechanism 7 through a bridge section;

[0096] S4: Cover the polishing container 3 with the lid, and add the preset amount of processing medium 2 into the polishing container 3 through the medium circulation device 9;

[0097] S5: Sequentially start the lifting mechanism 4, feeding mechanism 5, vibration mechanism 7, and rotary mechanism 6, and set the radial interval time, radial intermittent feed amount, axial interval time, axial intermittent feed amount, and horizontal vibration frequency. and horizontal amplitude Vertical vibration frequency and vertical amplitude And the circumferential interval time and rotation angle;

[0098] S6: After the preset processing time, the above mechanisms will be closed in sequence according to the principle of opening first and closing last;

[0099] S7: Recycle the processing medium 2 into the medium circulation device 9;

[0100] S8: Open the cover of the polishing container 3 and take out the polished large gear ring 1.

[0101] Processing effect:

[0102] like Figure 8 , Figure 9 As shown, after adopting a vertical local forced vibration polishing method for large wind turbine gear rings, the gear ring tooth surface is machined uniformly and the surface texture tends to be isotropic. The average roughness value of the tooth surface is reduced from [previous value]. Descending to .

[0103] Example 2:

[0104] The difference between Example 2 and Example 1 is that the deflection angle is taken. The rotary mechanism 6 provides intermittent rotary motion; in this embodiment, a circumferential interval time is selected. Rotation angle .

[0105] Processing effect:

[0106] like Figure 10 , Figure 11 As shown, after adopting a vertical localized forced vibration polishing method for large wind turbine gear rings, the gear ring tooth surface is machined uniformly and the surface texture tends to be isotropic. The average roughness value of the tooth surface is reduced from [previous value]. Descending to .

[0107] This invention employs localized forced vibration, concentrating energy in the vibration area. Through the forced vibration mechanism, it directly acts on the part to be polished, achieving efficient and targeted processing, ensuring effective energy utilization and improved processing quality.

[0108] Traditional distributed excitation relies on the synergistic effect of multiple excitation points, distributing energy over a large area. This is suitable for integral processing, but may lead to insufficient energy transfer efficiency, affecting the uniformity and consistency of the processing.

[0109] Compared to distributed excitation, the advantages of local forced excitation are:

[0110] (1) Improve the flexibility of targeted processing:

[0111] Vertical local forced vibration can target specific tooth surfaces of large gear ring 1 for polishing. The excitation element 8 directly applies a strong excitation force to the gear ring to be processed, forming a local energy concentration, improving the kinetic energy and fluidity of the particle media group, and significantly enhancing the interaction force between the particle media, thereby improving the polishing effect.

[0112] (2) Topology optimization of excitation element profile:

[0113] In distributed excitation, traditional planar excitation element designs often result in uneven energy transfer in localized areas during particle vibration, especially when particle flow is restricted, preventing energy from reaching the depths of the tooth surface. The topology-optimized excitation element 8 can guide the particle flow field within specific regions, enabling more uniform energy transfer to all parts of the tooth surface, particularly in hard-to-reach areas like the tooth root, ensuring a uniform finish across the entire tooth surface.

[0114] (3) Multidimensional motion synergy:

[0115] Vertical localized forced excitation utilizes the synergistic effect of multi-dimensional motion to greatly improve polishing efficiency. The axial intermittent feed of the lifting mechanism, the circumferential intermittent rotation of the rotary mechanism, and the radial reciprocating linear motion of the vibration mechanism can efficiently generate a forced particle flow field, thereby improving polishing efficiency.

[0116] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the 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: The polished section of the large gear ring (1) to be polished is placed in a polishing container (3) containing a processing medium (2); the exciting element (8) in the processing medium (2) is driven to perform a combined radial intermittent feeding motion, an axial intermittent feeding motion and a reciprocating linear motion, and the large gear ring (1) is coordinated with the circumferential intermittent rotary motion 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 smoothed; 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); the vibrating mechanism (7), the feeding mechanism (5) and the lifting mechanism (4) are connected in sequence from top to bottom to form a combined motion mechanism for driving the excitation element (8), and the excitation element (8) is connected to the vibrating mechanism (7) via a bridge 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); The surface configuration of the excitation element (8) also includes a topologically optimized surface, with a unit material density To optimize the variables, with 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 .

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 2, 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 .

4. A vertical local forced vibration polishing method for a large wind turbine gear ring according to claim 3, 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: .

5. A vertical local forced vibration polishing method for a large wind turbine gear ring according to claim 4, 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: .

6. 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: .

7. 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).

8. A vertical local forced vibration polishing method for a large wind turbine gear ring according to claim 7, 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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