Multi-harmonic excitation conformal polishing and grinding device and method for ring parts

Abstract

The invention belongs to the technical field of part processing, and provides a multi-harmonic excitation conformal polishing and grinding device and method for ring parts, the device adopts a double-mass double-excitation four-machine reverse split driving mechanical vibration system, high-frequency large-amplitude compound vibration of a conformal container is realized, and the polishing and grinding efficiency is improved. Therefore, the particle medium is driven to perform efficient longitudinal spiral motion around the ring part; the rotary motion of the ring part cooperates with the geometric constraint of the conformal container, so that the relative motion between the particle medium and the ring part is improved, an alternating stress flow field is formed in the ring part, and the problem that the inner surface machining efficiency and the outer surface machining efficiency are inconsistent due to the splitting effect of the ring part on the particle flow field is successfully solved. By means of the method, the problems of low machining efficiency, uneven machining and poor surface quality existing in a traditional finishing machining method for the ring parts with the cartridge receiver and the flame tube as typical parts can be solved, and the machining cost is reduced while the machining precision and the surface quality of the ring parts are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of parts processing, and in particular relates to a multi-harmonic excitation conformal polishing device and method for ring parts. Background Art

[0002] With significant breakthroughs in aero-engine manufacturing technology, the requirements for surface quality of critical aero-engine parts are constantly increasing. Advanced surface precision machining technologies, such as deburring, polishing, industrial cleaning, and precision surface treatment, can significantly improve key quality indicators such as component fit accuracy, fatigue strength, corrosion resistance, and service performance, thereby ensuring the reliability and service life of aero-engine parts. Among them, key ring-type parts such as the hot-end thin-walled casing and flame tube, which are mainly made of deformed high-temperature alloys, are turned, milled, drilled, and ground to ensure geometric accuracy. However, due to the high plasticity of the material and the complex crystal structure and geometric features, cutting is discontinuous, which makes it very easy to produce flanging burrs during machining. At the same time, different types of damage to the surface will be caused, including residual tensile stress, work hardening, surface roughness, and microcracks. These surface defects seriously affect the reliability of the parts during use. Therefore, surface finishing of such parts has become an indispensable step in the manufacturing process.

[0003] Currently, manual polishing is commonly used to improve the surface quality of such high-performance parts, but its stability is poor and its efficiency is low, and it is prone to over-polishing or under-polishing. There is also a patent (CN113385900B) that discloses an integrated measurement-milling-deburring-grinding and polishing casing processing device. By replacing different tools with a robot to process the casing, automated processing is achieved, ensuring stability from measurement to grinding and polishing, reducing manual intervention, and improving processing efficiency and quality. However, during the deburring and polishing process, the complexity of the polishing tools for annular casings with different complex processing features increases due to the diversity of their edge and surface properties and the difficulty of material processing. This limits the accessibility of the polishing tools and requires complex programming and debugging, which reduces processing efficiency and quality. Therefore, in response to the polishing needs of typical annular parts such as annular thin-walled casings and flame tubes, combined with the application and promotion of vibration roller finishing technology in the field of aviation manufacturing, it is urgent to propose an efficient and high-quality vibration polishing solution. Summary of the Invention

[0004] In order to solve the problems of low processing efficiency, uneven processing, poor surface quality and other problems existing in traditional finishing methods for ring-type parts, such as casings and flame tubes, the present invention provides a multi-harmonic excitation conformal polishing device for ring-type parts. By controlling the movement and geometric constraints of the conformal container, the polishing path, pressure and energy distribution of the processing medium are adjusted according to the geometric characteristics of the ring-type parts, so that the processing medium can fully and adaptively contact the workpiece surface, thereby improving processing efficiency and surface quality.

[0005] The present invention provides the following technical solution: a multi-harmonic excitation conformal polishing device for ring-type parts, comprising a main vibrating body, a conformal container, a rotating system, a main vibrating spring, an amplifying vibrating body, a vibration isolation spring and a support seat; The first side of the amplifying vibration body is connected to the support base through a vibration isolation spring; the first vibration motor and the second vibration motor with opposite speeds are fixedly arranged on the first side of the amplifying vibration body to generate a first simple harmonic excitation in the vertical direction; The main vibrator and the second side of the amplifying vibrator are connected via a main vibrator spring; The main vibrator includes a container fixing frame for accommodating an adapted container, and a third vibration motor and a fourth vibration motor are arranged at symmetrical positions outside the container fixing frame at a preset angle and in opposite directions with the same speed to generate a second simple harmonic excitation in the vertical direction and swinging around the vertical axis; The rotating system is used to clamp the ring-like parts and make the ring-like parts move in a preset motion mode in the conformable container.

[0006] Furthermore, the conformable container includes a basic cavity, a central island, and a rectifying liner; the basic cavity is fixedly connected to the container fixing frame to achieve vibration transmission, the rectifying liner is fixedly connected to the inner side wall of the basic cavity, and the central island is fixedly arranged in the basic cavity and fixedly connected to the bottom center of the basic cavity; The conformable container is used to accommodate the processing medium composed of granular medium and polishing liquid.

[0007] Furthermore, the amplifying vibrator is arranged in a circular shape, the main vibration springs are evenly arranged along the circumference of the amplifying vibrator, the number of the main vibration springs is 12 to 16, and the vibration isolation springs are evenly arranged along the circumference of the amplifying vibrator, the number of the vibration isolation springs is 6 to 12.

[0008] Furthermore, the rotation system is a three-degree-of-freedom automated truss structure, which includes a clamp, a spindle drive, a horizontal drive, a vertical drive and a movable truss; the clamp is used to clamp ring parts; the spindle drive is connected to the clamp, the spindle drive is connected to the horizontal drive, and the horizontal drive is connected to the vertical drive, and the clamp is controlled to move in three directions in the spatial coordinate system through the spindle drive, horizontal drive and vertical drive; the spindle drive, horizontal drive and vertical drive are arranged on the movable truss.

[0009] Furthermore, the basic cavity is an open cylindrical container, and the horizontal cross-section of the rectifying liner is circular, elliptical or regular polygonal; the minimum inscribed circle diameter of the rectifying liner is and height satisfy: in, is the maximum outer diameter of the ring parts, is the height of the ring parts; 、 are the minimum inscribed circle diameter and height of the rectifier liner respectively; 、 are the diameter and height of the basic cavity respectively.

[0010] Furthermore, the contour curves of the vertical sections of the central island and the rectifier lining are linear function curves, convex function curves or concave function curves; the pressure distribution of the granular medium flow field between the conformable container and the annular parts is changed by adjusting the curve type; wherein, in the granular medium flow field, The calculation formula of the average pressure at is: in, For the granular medium flow field r The average pressure at and dynamic pressure constitute; is the coordinate matrix; is the mass density; is the static friction coefficient between the particle and the wall; is the force steering coefficient; is the acceleration due to gravity; The filling height of the granular medium is The padding width when is the absolute velocity of the granular medium; is an exponential function with base 2.718.

[0011] Furthermore, the center island is fixedly connected to the basic cavity; by designing the geometric parameters to match the rotation speed of the ring parts , construct the alternating pressure distribution flow field in the ring; the instantaneous alternating pressure of the flow field satisfy: in, is the instantaneous alternating pressure; is the amplitude of pressure pulsation; is the steering coefficient of ring parts, with values ​​of -1, 0, 1; is the pressure pulsation angular velocity; is the rotational speed of the ring parts.

[0012] Furthermore, the first simple harmonic excitation is generated When , the differential equation of motion of the center of mass of the amplifying vibration body satisfies: Generate second harmonic excitation When , the differential equation of motion of the center of mass of the master oscillator satisfies: in, The center of mass of the amplifying vibrator and the main vibrator are Directional displacement; The center of mass of the amplifying vibrator and the main vibrator are Angular displacement of direction; for The second derivative of for The first derivative of ; are the parametric masses of the amplifying vibrator and the main vibrator respectively; is the mass of the conformable container; is the total mass of the polishing media placed in the conformable container; The vibration isolation springs are Direction and Spring stiffness in direction; The main vibration spring is Direction and Spring stiffness in direction; The vibration isolation springs are Direction and Spring damping in direction, The main vibration spring is Direction and Spring damping in direction; Main oscillator winding The moment of inertia of the shaft; , are the simple harmonic excitation vibration frequencies of the amplified vibrator and the main vibrator respectively; For time; is the matrix element index; A wildcard character represents any character; First simple harmonic excitation satisfy: Second simple harmonic excitation satisfy: in, For the The eccentric mass of a vibration motor, For the The eccentricity of the vibration motor, is the angular displacement of the vibration motor, Number the vibration motor, ; ; is the horizontal distance between the mass centers of the third vibration motor and the fourth vibration motor; is the angle between the third vibration motor and the fourth vibration motor in the horizontal plane.

[0013] Furthermore, the center of mass of the main vibrator is along The displacement in the direction of ,along The angular displacement in the direction is , the center of mass of the amplified vibration body is along Directional displacement satisfy: Where, The center of mass of the amplified vibration body is excited at the first simple harmonic Amplitude component under action; The center of mass of the amplified vibration body is excited at the second simple harmonic Amplitude component under action; The center of mass of the main vibrator is the first simple harmonic excitation Amplitude component under action; The center of mass of the main vibrating body is excited by the second simple harmonic Amplitude component under action; The center of mass of the main vibrator is the first simple harmonic excitation Angular amplitude component under action; The center of mass of the main vibrator is the second simple harmonic excitation Angular amplitude component under action; is the displacement of the amplified vibrating body and the first simple harmonic excitation Phase difference; is the displacement of the amplified vibrating body and the second simple harmonic excitation Phase difference; The displacement of the main oscillator and the first simple harmonic excitation Phase difference; The displacement of the main oscillator and the second simple harmonic excitation Phase difference.

[0014] The present invention also provides the following technical solution: a multi-harmonic excitation conformal polishing method for ring parts, the method comprising the steps of: S1. Position and install the ring part, center island, and rectifier liner in ascending order according to their size range, and securely connect the rectifier liner to the basic cavity. Clamp the ring part with the clamping jaws, and adjust the horizontal and vertical drives to position the ring part in the conformable container, ensuring that the axis of the ring part and the conformable container coincide and that the height from the bottom of the conformable container is 50-200 mm. S2, loading the processing medium into a conformable container; the particle shape of the processing medium is selected from spheres, oblique cylinders, triangular prisms, cones or irregular shapes of different sizes, with a filling volume of 50-80%; S3, start the third vibration motor and the fourth vibration motor, and set the vibration frequency to 15Hz-60Hz; start the first vibration motor and the second vibration motor, and set the vibration frequency to 15Hz-60Hz; drive the conformable container to perform a composite vibration with a vibration frequency of 15Hz-60Hz, an amplitude of 0.5-3mm, and a phase angle of 0.05-1°; start the spindle drive, and drive the ring-like parts to perform a forward and reverse alternating rotation motion at 5-100r / min; S4, after polishing is completed, stop the first vibration motor, the second vibration motor, the third vibration motor, the fourth vibration motor and the main shaft drive, adjust the horizontal drive and the vertical drive, release the clamping jaws, and remove the ring parts; S5, clean, dry, and inspect whether the ring parts meet the processing requirements, otherwise return to S1; if they meet the requirements, pack the ring parts, clean and save the processing medium.

[0015] Compared with the prior art, the present invention provides a multi-harmonic excitation conformal polishing device and method for ring-type parts. The device adopts a dual-mass dual-excitation four-machine reverse-split drive mechanical vibration system to achieve high-frequency and large-amplitude composite vibration of the conformal container, thereby driving the granular medium to perform efficient longitudinal spiral motion around the ring-type parts; by adjusting the vertical cross-sectional profile curves of the center island and the rectifier liner, the particle flow field pressure distribution between the conformal container and the ring-type parts can be optimized, significantly improving the problem of uneven surface treatment along the height direction in traditional processing; at the same time, the rotational motion of the ring-type parts and the geometric constraints of the conformal container not only enhance the relative motion between the granular medium and the ring-type parts, but also form an alternating stress flow field inside the ring-type parts, successfully overcoming the problem of inconsistent inner and outer surface processing efficiency caused by the cutting effect of the ring-type parts on the particle flow field; the present invention can solve the problems of low processing efficiency, uneven processing, poor surface quality, etc. of ring-type parts, such as casings and flame tubes, in traditional finishing processing methods, thereby improving the processing accuracy and surface quality of the ring-type parts while reducing the processing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0017] Figure 1 A schematic diagram of the principle of a multi-harmonic excitation conformal polishing device for ring parts provided by the present invention; Figure 2 A schematic diagram of a principle prototype of a multi-harmonic excitation conformal polishing device for ring parts provided by the present invention; Figure 3 A schematic diagram of a mechanical model of a multi-harmonic excitation conformal polishing device for ring parts provided by the present invention; Figure 4 A schematic structural diagram of a rotating system in a multi-harmonic excitation conformal polishing device for ring-type parts provided by the present invention; Figure 5 A schematic diagram of the structure and busbar type of a conformal container in a multi-harmonic excitation conformal polishing device for ring-type parts provided by the present invention; Figure 6 A schematic diagram of another structure and busbar type of an adaptive container in a multi-harmonic excitation conformal polishing device for ring-type parts provided by the present invention; Figure 7 A schematic diagram of the relationship between adjusting the installation angles of the third and fourth vibration motors to change the influence of the second simple harmonic excitation on the vertical amplitude of the main oscillator and the oscillation amplitude around the vertical axis in a multi-harmonic excitation conformal polishing device for ring-type parts provided by the present invention; Figure 8 A schematic diagram of the displacement response of a multi-harmonic excitation conformal polishing device for ring parts provided by the present invention under different main vibration spring stiffnesses and main vibration body masses when the vibration frequency is 25 Hz; Figure 9 A schematic diagram of the displacement trajectory of each point on a conformal container in a multi-harmonic excitation conformal polishing device for ring-type parts provided by the present invention; Figure 10 The rigid-discrete coupling simulation results of the multi-harmonic excitation conformal polishing of the annular casing in the multi-harmonic excitation conformal polishing device for ring parts provided by the present invention; Figure 11 This is a magnified view of the surface morphology and orifice of a thin-walled flame tube before polishing in a multi-harmonic excitation conformal polishing device for ring parts provided by the present invention.

[0018] Figure 12 This is a diagram showing the surface morphology and hole rounding effect of a thin-walled flame tube after polishing in a multi-harmonic excitation conformal polishing device for ring parts provided by the present invention.

[0019] In the figure: 1-main vibrator; 101-container fixing frame; 102-third vibration motor; 103-fourth vibration motor; 2-conformable container; 201-basic cavity; 202-center island; 203-rectification lining; 204-processing medium; 3-rotation system; 301-ring parts; 302-gripper; 303-spindle drive; 304-horizontal drive; 305-vertical drive; 306-movable truss; 4-main vibration spring; 5-amplifier vibrator; 501-first vibration motor; 502-second vibration motor; 6-vibration isolation spring; 7-support base. DETAILED DESCRIPTION

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0021] Example 1: like Figure 1 、 Figure 2 and Figure 4 The figure shows a multi-harmonic excitation conformal polishing device for ring-type parts, comprising a main vibrator 1, a conformal container 2, a rotating system 3, a main vibration spring 4, an amplifier vibrator 5, a vibration isolation spring 6, and a support base 7. The first side of the amplifier vibrator 5 is connected to the support base 7 via the vibration isolation spring 6. A first vibration motor 501 and a second vibration motor 502, which run in opposite directions and at the same speed, are fixedly mounted on the first side of the amplifier vibrator 5 to generate a first simple harmonic excitation in the vertical direction. Specifically, according to Figure 3 The mechanical model shown is derived to produce the first simple harmonic excitation When , the differential equation of motion of the center of mass of the amplifying vibrating body 5 satisfies: The main vibrator 1 and the second side of the amplifying vibrator 5 are connected via a main vibrator spring 4; The main vibrator 1 includes a container fixing frame 101 for accommodating the conformable container 2. A third vibration motor 102 and a fourth vibration motor 103 are symmetrically arranged at a preset angle outside the container fixing frame 101, with opposite speeds, to generate a second simple harmonic excitation in the vertical direction and around the vertical axis. Generate second harmonic excitation When , the differential equation of motion of the center of mass of the main oscillator 1 satisfies: in, The center of mass of the amplifying vibrator and the main vibrator are Directional displacement; The center of mass of the amplifying vibrator and the main vibrator are Angular displacement of direction; for The second derivative of for The first derivative of ; are the parametric masses of the amplifying vibrator and the main vibrator respectively; is the mass of the conformable container; is the total mass of the polishing media placed in the conformable container; The vibration isolation springs are Direction and Spring stiffness in direction; The main vibration spring is Direction and Spring stiffness in direction; The vibration isolation springs are Direction and Spring damping in direction, The main vibration spring is Direction and Spring damping in direction; Main oscillator winding The moment of inertia of the shaft, in addition, For the amplification vibration body The moment of inertia of the shaft; , are the simple harmonic excitation vibration frequencies of the amplified vibrator and the main vibrator respectively; For time; is the matrix element index; A wildcard character represents any character; like Figure 3 As shown, the first simple harmonic excitation satisfy: Second simple harmonic excitation satisfy: in, For the The eccentric mass of a vibration motor, For the The eccentricity of the vibration motor, is the angular displacement of the vibration motor, Number the vibration motor, ; ; is the horizontal distance between the mass centers of the third vibration motor and the fourth vibration motor; is the angle between the third vibration motor and the fourth vibration motor in the horizontal plane.

[0022] The center of mass of the amplifying vibrator 5 is along Directional displacement , the center of mass of the main vibrator 1 is along The displacement in the direction of ,along The angular displacement in the direction is ,satisfy: Where, The center of mass of the amplified vibration body is excited at the first simple harmonic Amplitude component under action; The center of mass of the amplified vibration body is excited at the second simple harmonic Amplitude component under action; The center of mass of the main vibrator is the first simple harmonic excitation Amplitude component under action; The center of mass of the main vibrator is the second simple harmonic excitation Amplitude component under action; The center of mass of the main vibrator is the first simple harmonic excitation Angular amplitude component under action; The center of mass of the main vibrator is the second simple harmonic excitation Angular amplitude component under action; is the displacement of the amplified vibrating body and the first simple harmonic excitation Phase difference; is the displacement of the amplified vibrating body and the second simple harmonic excitation Phase difference; The displacement of the main oscillator and the first simple harmonic excitation Phase difference; The displacement of the main oscillator and the second simple harmonic excitation Phase difference.

[0023] like Figure 4 As shown, the rotation system 3 is used to clamp the ring-like part 301 and move the ring-like part 301 in the conformable container 2 according to a preset motion mode. The preset motion mode includes, but is not limited to, rotation, lateral dragging, and lifting in a spatial coordinate system. The rotation system 3 is a three-degree-of-freedom automated truss structure, comprising a gripper 302, a spindle drive 303, a horizontal drive 304, a vertical drive 305, and a movable truss 306. The gripper 302 is used to clamp the ring-like part 301. The spindle drive 303 is connected to the gripper 302, which is in turn connected to the horizontal drive 304, which is in turn connected to the vertical drive 305. The spindle drive 303, horizontal drive 304, and vertical drive 305 control the movement of the gripper 302 in three directions in the spatial coordinate system. The spindle drive 303, horizontal drive 304, and vertical drive 305 are disposed on the movable truss 306.

[0024] In an embodiment of the present invention, the conformable container 2 includes a basic cavity 201, a central island 202 and a rectification liner 203; the basic cavity 201 is fixedly connected to the container fixing frame 101 to realize vibration transmission, the rectification liner 203 is fixedly connected to the inner side wall of the basic cavity 201, and the central island 202 is fixedly arranged in the basic cavity 201 and fixedly connected to the bottom center of the basic cavity 201, as shown in FIG. Figure 5 and Figure 6 shown.

[0025] The conformable container 2 is used to accommodate the processing medium 204 composed of granular media and polishing liquid.

[0026] Figure 7 In the embodiment of the present invention, according to and Expression, a schematic diagram showing the relationship between the vertical amplitude and the swing amplitude around the vertical axis of the main vibrator 1 when adjusting the installation angle of the third vibration motor 102 and the fourth vibration motor 103 to change the second simple harmonic excitation.

[0027] In the present invention, the amplifying vibrator 5 is set to be circular, the main vibration springs 4 are evenly arranged along the circumference of the amplifying vibrator 5, the number of the main vibration springs 4 is 12 to 16, and the vibration isolation springs 6 are evenly arranged along the circumference of the amplifying vibrator 5, the number of the vibration isolation springs 6 is 6 to 12. Figure 8 The figure shows the displacement response under different main vibration spring stiffness and main vibration body mass when the vibration frequency is 25 Hz.

[0028] Figure 9 is the displacement trajectory of each point on the conformable container 2 of the embodiment of the present invention, and the conformable container 2 and the main vibrator 1 are 、 Similarly, the processing medium 204 is driven to make conformal motion around the ring-like part 301 in the conformal container 2 .

[0029] The basic cavity 201 is an open cylindrical container, and the horizontal cross-section of the rectifying liner 203 is circular, elliptical or regular polygonal; the minimum inscribed circle diameter of the rectifying liner 203 is and height satisfy: in, is the maximum outer diameter of the ring parts, is the height of the ring parts; 、 are the minimum inscribed circle diameter and height of the rectifier liner respectively; 、 are the diameter and height of the basic cavity respectively.

[0030] The contour curve of the vertical section of the central island 202 and the rectifying liner 203 is a linear function curve, a convex function curve or a concave function curve; the pressure distribution of the granular medium flow field between the conformable container 2 and the annular part 301 is changed by adjusting the curve type; wherein, in the granular medium flow field, The calculation formula of the average pressure at is: in, For the granular medium flow field r The average pressure at and dynamic pressure constitute; is the coordinate matrix; is the mass density; is the static friction coefficient between the particle and the wall; is the force steering coefficient; is the acceleration due to gravity; The filling height of the granular medium is The padding width when is the absolute velocity of the granular medium; is an exponential function with base 2.718.

[0031] The center island 202 is fixedly connected to the basic cavity 201; the rotation speed of the ring part 301 is matched with the design of geometric parameters. , construct the alternating pressure distribution flow field in the ring; the instantaneous alternating pressure of the flow field satisfy: in, is the instantaneous alternating pressure; is the amplitude of pressure pulsation; is the steering coefficient of ring parts, with values ​​of -1, 0, 1; is the pressure pulsation angular velocity; is the rotational speed of the ring parts.

[0032] Example 2: This embodiment provides a rigid-discrete coupling simulation using the device of Example 1. The ring-shaped part 301 is an engine combustion chamber casing, with a large end diameter of 350 mm, a small end diameter of 290 mm, and a height of 120 mm.

[0033] The granular medium discrete element model was established using EDEM simulation software. The simulated granular medium was a 6mm equilateral triangular high-alumina porcelain with a filling volume of 80%. According to the average pressure calculation formula and simulation results, the horizontal cross-section shape of the rectifier liner 203 was adjusted to a circular shape. The minimum inscribed circle diameter of the rectifier liner 203 was 500mm and the height was 300mm. The contour curve of the vertical cross-section of the rectifier liner 203 and the center island 202 was a linear function curve. The parametric model of the polishing device in Example 1 was established using the software RecurDyn. Its simulation equipment parameters are as follows: Table 1 Simulation equipment parameters The height of the combustion chamber casing from the bottom of conformal container 2 is 100 mm, and the rotation speed of the combustion chamber casing is set to 25 r / min. The simulation time is 7 seconds, with the first 2 seconds for equipment startup and EDEM generation of the granular medium, and the last 5 seconds for rigid-discrete coupling simulation. The equipment motion state information provided by RecurDyn multi-body dynamics software, including position, velocity, and acceleration, is used. At the same time, EDEM calculates the motion, collision, and contact forces of the granular medium based on this equipment information and generates the state data of the granular medium. Subsequently, EDEM sends the calculated particle contact force, displacement, and velocity information to RecurDyn through a preset interface. Finally, RecurDyn receives this data and updates the motion state of its vibration system model, realizing dynamic data interaction between the two.

[0034] like Figure 10 As shown, the wear depth at the sharp corners of the boss edges on the combustion chamber casing surface is greater than that on the surface, demonstrating that the apparatus of Example 1 can effectively remove burrs from edges and achieve a blunting effect on sharp edges. Furthermore, due to the geometric adjustments of the rectifying liner 203 and the center island 202 of the conformable container 2, the wear depth along the height direction of the inner and outer surfaces of the combustion chamber casing is consistent, achieving uniform polishing across the entire surface of the combustion chamber casing.

[0035] Example 3: This embodiment provides a multi-harmonic excitation conformal polishing method for ring-type parts using the apparatus of embodiment 1. The ring-type part 301 being processed is a high-temperature alloy annular flame tube with a large end diameter of 250 mm, a small end diameter of 200 mm, and a height of 80 mm. The method includes the following steps: S1. Position and install the ring component 301, the center island 202, and the rectifier liner 203 in ascending order according to their size ranges, and securely connect the rectifier liner 203 to the basic cavity 201. Clamp the ring component 301 with the clamp 302, and adjust the horizontal drive 304 and the vertical drive 305 to position the ring component 301 in the conformable container 2. Ensure that the axes of the ring component 301 and the conformable container 2 coincide, and that the height from the bottom of the conformable container 2 is 50-200 mm. S2, loading the processing medium 204 into the conformable container 2; the particle shape of the processing medium 204 is selected from spheres, oblique cylinders, triangular prisms, cones or irregular shapes of different sizes, with a filling amount of 50-80%; S3, start the third vibration motor 102 and the fourth vibration motor 103, and set the vibration frequency to 15Hz-60Hz; start the first vibration motor 501 and the second vibration motor 502, and set the vibration frequency to 15Hz-60Hz; drive the conformable container 2 to perform a composite vibration with a vibration frequency of 15Hz-60Hz, an amplitude of 0.5-3mm, and a phase angle of 0.05-1°; start the spindle drive 303, and drive the ring-shaped component 301 to perform a forward and reverse alternating rotation motion at 5-100r / min; S4, after polishing is completed, stop the first vibration motor 501, the second vibration motor 502, the third vibration motor 102, the fourth vibration motor 103 and the spindle drive 303, adjust the horizontal drive 304 and the vertical drive 305, loosen the clamping jaws 302, and remove the ring part 301; S5, cleaning, drying, and checking whether the ring parts meet the processing requirements, otherwise return to S1; if they meet the requirements, the ring parts 301 are packaged, and the processing medium 204 is cleaned and stored.

[0036] Processing effect such as Figure 11 and Figure 12 As shown in the figure, after polishing a high-temperature alloy annular flame tube using a multi-harmonic excitation conformal polishing device and method, the surface roughness Ra of the annular flame tube was reduced from 3.2μm to 1.2μm, and the RSD value of the axial surface roughness was 0.13, demonstrating good machining uniformity and consistency. The surface machining marks of the annular flame tube were removed, and the surface finish was significantly improved. The surface texture was greatly enhanced, achieving the goal of finishing.

[0037] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein, but is to be construed in the widest manner consistent with the principles and novel features disclosed herein.

Claims

1. A multi-harmonic excitation conformal polishing device for ring parts, characterized by: It includes a main vibrating body (1), a conformable container (2), a rotating system (3), a main vibrating spring (4), an amplifying vibrating body (5), a vibration isolation spring (6) and a supporting seat (7); The first side of the amplifying vibration body (5) is connected to the support base (7) via a vibration isolation spring (6); a first vibration motor (501) and a second vibration motor (502) with opposite and same speeds are fixedly arranged on the first side of the amplifying vibration body (5) to generate a first simple harmonic excitation in the vertical direction; The main vibrator (1) and the second side of the amplifying vibrator (5) are connected via a main vibrator spring (4); The main vibrator (1) comprises a container fixing frame (101) for accommodating a conformable container (2), and a third vibration motor (102) and a fourth vibration motor (103) with opposite directions and the same speed are arranged at a preset angle at symmetrical positions outside the container fixing frame (101) to generate a second simple harmonic excitation in a vertical direction and swinging around a vertical axis; The rotating system (3) is used to clamp the ring-like part (301) and enable the ring-like part (301) to move in the conformable container (2) according to a preset movement mode.

2. The multi-harmonic excitation conformal polishing device for ring parts according to claim 1, characterized in that: The conformable container (2) comprises a basic cavity (201), a central island (202), and a rectifying liner (203); the basic cavity (201) is fixedly connected to the container fixing frame (101) to achieve vibration transmission, the rectifying liner (203) is fixedly connected to the inner side wall of the basic cavity (201), and the central island (202) is fixedly arranged in the basic cavity (201) and fixedly connected to the bottom center of the basic cavity (201); The conformable container (2) is used to accommodate a processing medium (204) consisting of a granular medium and a polishing liquid.

3. The multi-harmonic excitation conformal polishing device for ring parts according to claim 1, characterized in that: The amplifying vibrator (5) is arranged in a circular shape, the main vibration springs (4) are evenly arranged along the circumference of the amplifying vibrator (5), and the number of the main vibration springs (4) is 12 to 16. The vibration isolation springs (6) are evenly arranged along the circumference of the amplifying vibrator (5), and the number of the vibration isolation springs (6) is 6 to 12.

4. The multi-harmonic excitation conformal polishing device for ring parts according to claim 2, characterized in that: The rotation system (3) is a three-degree-of-freedom automated truss structure, and the rotation system (3) includes a clamp (302), a spindle drive (303), a horizontal drive (304), a vertical drive (305) and a movable truss (306); the clamp (302) is used to clamp the ring part (301); the spindle drive (303) is connected to the clamp (302), the spindle drive (303) is connected to the horizontal drive (304), and the horizontal drive (304) is connected to the vertical drive (305), and the clamp (302) is controlled to move in three directions in the spatial coordinate system through the spindle drive (303), the horizontal drive (304) and the vertical drive (305); the spindle drive (303), the horizontal drive (304) and the vertical drive (305) are arranged on the movable truss (306).

5. The multi-harmonic excitation conformal polishing device for ring parts according to claim 2, characterized in that: The basic cavity (201) is an open cylindrical container, and the horizontal cross-section of the rectifying lining (203) is circular, elliptical or regular polygonal; the minimum inscribed circle diameter of the rectifying lining (203) is and height satisfy: in, is the maximum outer diameter of the ring parts, is the height of the ring parts; 、 are the minimum inscribed circle diameter and height of the rectifier liner respectively; 、 are the diameter and height of the basic cavity respectively.

6. The multi-harmonic excitation conformal polishing device for ring parts according to claim 2, characterized in that: The contour curves of the vertical sections of the central island (202) and the rectifying lining (203) are linear function curves, convex function curves, or concave function curves; the pressure distribution of the granular medium flow field between the conformable container (2) and the annular part (301) is changed by adjusting the curve type; wherein, in the granular medium flow field, The calculation formula of the average pressure at is: in, For the granular medium flow field r The average pressure at and dynamic pressure constitute; is the coordinate matrix; is the mass density; is the static friction coefficient between the particle and the wall; is the force steering coefficient; is the acceleration due to gravity; The filling height of the granular medium is The padding width when is the absolute velocity of the granular medium; is an exponential function with base 2.

718.

7. The multi-harmonic excitation conformal polishing device for ring parts according to claim 4, characterized in that: The center island (202) is fixedly connected to the basic cavity (201); the rotation speed of the ring part (301) is matched by designing geometric parameters. , construct the alternating pressure distribution flow field in the ring; the instantaneous alternating pressure of the flow field satisfy: in, is the instantaneous alternating pressure; is the amplitude of pressure pulsation; is the steering coefficient of ring parts, with values ​​of -1, 0, 1; is the pressure pulsation angular velocity; is the rotational speed of the ring parts.

8. The multi-harmonic excitation conformal polishing device for ring parts according to claim 1, characterized in that: Generate the first simple harmonic excitation When , the differential equation of motion of the center of mass of the amplifying vibrating body (5) satisfies: Generate second harmonic excitation When , the differential equation of motion of the center of mass of the main oscillator (1) satisfies: in, The center of mass of the amplifying vibrator and the main vibrator are Directional displacement; The center of mass of the amplifying vibrator and the main vibrator are Angular displacement of direction; for The second derivative of for The first derivative of ; are the parametric masses of the amplifying vibrator and the main vibrator respectively; is the mass of the conformable container; is the total mass of the polishing media placed in the conformable container; The vibration isolation springs are Direction and Spring stiffness in direction; The main vibration spring is Direction and Spring stiffness in direction; The vibration isolation springs are Direction and Spring damping in direction, The main vibration spring is Direction and Spring damping in direction; Main oscillator winding The moment of inertia of the shaft; , are the simple harmonic excitation vibration frequencies of the amplified vibrator and the main vibrator respectively; For time; is the matrix element index; A wildcard character represents any character; First simple harmonic excitation satisfy: Second simple harmonic excitation satisfy: in, For the The eccentric mass of a vibration motor, For the The eccentricity of the vibration motor, is the angular displacement of the vibration motor, Number the vibration motor, ; ; is the horizontal distance between the mass centers of the third vibration motor and the fourth vibration motor; is the angle between the third vibration motor and the fourth vibration motor in the horizontal plane.

9. The multi-harmonic excitation conformal polishing device for ring parts according to claim 1, characterized in that: The center of mass of the main vibrator (1) is along The displacement in the direction of ,along The angular displacement in the direction is , the mass center of the amplifying vibrator (5) is along Directional displacement satisfy: Where, The center of mass of the amplified vibration body is excited at the first simple harmonic Amplitude component under action; The center of mass of the amplified vibration body is excited at the second simple harmonic Amplitude component under action; The center of mass of the main vibrator is the first simple harmonic excitation Amplitude component under action; The center of mass of the main vibrator is the second simple harmonic excitation Amplitude component under action; The center of mass of the main vibrator is the first simple harmonic excitation Angular amplitude component under action; The center of mass of the main vibrator is the second simple harmonic excitation Angular amplitude component under action; is the displacement of the amplified vibrating body and the first simple harmonic excitation Phase difference; is the displacement of the amplified vibrating body and the second simple harmonic excitation Phase difference; The displacement of the main oscillator and the first simple harmonic excitation Phase difference; The displacement of the main oscillator and the second simple harmonic excitation Phase difference.

10. A multi-harmonic excitation conformal polishing method for ring-like parts, based on a multi-harmonic excitation conformal polishing device for ring-like parts according to any one of claims 1 to 9, characterized in that: The method comprises the steps of: S1, positioning and installing the ring-like part (301), the center island (202) and the rectifier liner (203) in order from small to large according to the size range, and fixing the rectifier liner (203) to the basic cavity (201); clamping the ring-like part (301) by the clamping claw (302), adjusting the horizontal drive (304) and the vertical drive (305), so that the ring-like part (301) is located in the conformable container (2), ensuring that the axis of the ring-like part (301) and the conformable container (2) coincide, and the height from the bottom of the conformable container (2) is 50-200 mm; S2, loading the processing medium (204) into the conformable container (2); the particle shape of the processing medium (204) is selected to be spherical, oblique cylindrical, triangular prism or conical, and the filling amount is 50-80%; S3, starting the third vibration motor (102) and the fourth vibration motor (103), and setting the vibration frequency to 15 Hz-60 Hz; starting the first vibration motor (501) and the second vibration motor (502), and setting the vibration frequency to 15 Hz-60 Hz; driving the conformable container (2) to perform a composite vibration with a vibration frequency of 15 Hz-60 Hz, an amplitude of 0.5-3 mm, and a phase angle of 0.05-1°; starting the main shaft drive (303), and driving the ring-type part (301) to perform a forward and reverse alternating rotation motion of 5-100 r / min; S4, after polishing is completed, the first vibration motor (501), the second vibration motor (502), the third vibration motor (102), the fourth vibration motor (103) and the main shaft drive (303) are stopped, the horizontal drive (304) and the vertical drive (305) are adjusted, the clamping jaws (302) are released, and the ring part (301) is removed; S5, clean, dry, and check whether the ring parts meet the processing requirements, otherwise return to S1; if they meet the requirements, pack the ring parts (301), clean and save the processing medium (204).

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