A multi-resonant excitation conformal lapping device and method for ring-like parts

Abstract

The application belongs to the technical field of part processing, and provides a multi-resonance excitation conformal polishing device and method for ring parts, which adopts a four-machine reverse split driving mechanical vibration system with double-mass and double-excitation to realize high-frequency and large-amplitude composite vibration of a conformal container, so as to drive the particle medium to perform efficient longitudinal spiral motion around the ring part; the geometric constraint of the ring part rotation motion cooperates with the conformal container to not only improve the relative motion between the particle medium and the ring part, but also form an alternating stress flow field in the ring part, thereby successfully overcoming the problem of inconsistent processing efficiency of the inner and outer surfaces caused by the cutting effect of the ring part on the particle flow field. Through the application, the problems of low processing efficiency, uneven processing and poor surface quality of the ring parts such as a machine case and a flame tube in the traditional finishing processing method can be solved, the processing precision and surface quality of the ring parts are improved, and the processing cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of part processing, and particularly relates to a multi-harmonic excitation vibration conformal polishing and grinding device and method for ring-shaped parts. BACKGROUND

[0002] With important breakthroughs in aircraft engine manufacturing technology, the requirements for the surface quality of key parts of the aircraft engine are continuously increasing. Advanced surface precision machining technologies, such as deburring, polishing, industrial cleaning, and precision surface treatment, can significantly improve the key quality indicators of the parts, such as the fitting accuracy, fatigue resistance, corrosion resistance, and service performance, thereby ensuring the reliability and service life of the aircraft parts. Among them, the key ring-shaped parts such as the thin-walled casing and the flame tube of the deformed high-temperature alloy have their shape and geometric accuracy guaranteed by turning, milling, drilling, and grinding. However, due to the high plasticity of the material, the complex crystal structure, and the discontinuous cutting of the geometric features, the machining process is prone to produce burrs and different types of surface damage, including residual tensile stress, work hardening, surface roughness, and micro-cracks. These surface defects seriously affect the reliability of the parts during use. Therefore, surface finishing of such parts has become an indispensable process in the manufacturing process.

[0003] Currently, manual polishing and grinding methods are commonly used to improve the surface quality of such high-performance parts, but they have poor stability and low efficiency, and are prone to over-polishing or under-polishing. A patent (CN113385900B) discloses a measuring-milling-deburring-polishing integrated casing machining device, which uses a robot to replace different tools for casing machining, realizes automatic machining, ensures the stability from measurement to polishing, reduces manual intervention, and improves machining efficiency and quality. However, in the deburring and polishing process, due to the diversity of the edge and corner surfaces of the ring-shaped casing and the difficulty of machining the material, the complexity of the polishing tool is increased, the accessibility of the polishing tool is limited, and complex programming and debugging are required, which reduces the machining efficiency and quality. Therefore, in view of the polishing and grinding requirements of typical ring-shaped parts such as ring-shaped thin-walled casings and flame tubes, combined with the application and promotion of vibration-type rolling finishing machining technology in the field of aviation manufacturing, it is urgent to propose an efficient and high-quality vibration polishing scheme. SUMMARY

[0004] In order to solve the problems of low machining efficiency, uneven machining, and poor surface quality in the traditional finishing machining method for ring-shaped parts such as casings and flame tubes, a multi-harmonic excitation vibration conformal polishing and grinding device for ring-shaped parts is provided. By controlling the motion and geometric constraints of the conformal container, adjusting the polishing and grinding path, pressure, and energy distribution of the machining medium according to the geometric features of the ring-shaped parts, the machining medium can fully adapt to the contact with the workpiece surface, thereby improving the machining efficiency and surface quality.

[0005] The application provides the following technical scheme: a multi-harmonic excitation conformal polishing device for ring-shaped parts, comprising a main vibration body, a conformal container, a rotating system, a main vibration spring, an amplification vibration body, a vibration isolation spring and a support seat;

[0006] The first side of the amplification vibration body is connected to the support seat through the vibration isolation spring; the first side of the amplification vibration body is fixedly provided with first and second vibration motors of the same speed in opposite directions to generate a first simple harmonic excitation in the vertical direction;

[0007] The main vibration body and the second side of the amplification vibration body are connected through the main vibration spring;

[0008] The main vibration body comprises a container fixing frame for accommodating the conformal container; the third and fourth vibration motors of the same speed in opposite directions are arranged at symmetrical positions outside the container fixing frame at a preset angle to generate a second simple harmonic excitation in the vertical direction and swinging around the vertical axis;

[0009] The rotating system is used for clamping the ring-shaped part and enabling the ring-shaped part to move in the conformal container in a preset movement mode.

[0010] Further, the conformal container comprises a basic cavity, a central island table and a rectifying inner liner; the basic cavity is fixedly connected to the container fixing frame to realize vibration transmission; the rectifying inner liner is fixedly connected to the inner side wall of the basic cavity; and the central island table is fixedly arranged in the basic cavity and fixedly connected to the bottom center of the basic cavity.

[0011] The conformal container is used for accommodating a processing medium composed of a granular medium and a polishing liquid.

[0012] Further, the amplification vibration body is circular, the main vibration springs are uniformly arranged along the circumference of the amplification vibration body, the number of the main vibration springs is 12-16, the vibration isolation springs are uniformly arranged along the circumference of the amplification vibration body, and the number of the vibration isolation springs is 6-12.

[0013] Further, the rotating system is a three-degree-of-freedom automatic truss structure, and the rotating system comprises a clamping jaw, a main shaft drive, a horizontal drive, a vertical drive and a movable truss; the clamping jaw is used for clamping the ring-shaped part; the main shaft drive is connected to the clamping jaw, the main shaft drive is connected to the horizontal drive, the horizontal drive is connected to the vertical drive, the clamping jaw is controlled to move in three directions in a space coordinate system through the main shaft drive, the horizontal drive and the vertical drive; and the main shaft drive, the horizontal drive and the vertical drive are arranged on the movable truss.

[0014] Further, the basic cavity is an open barrel-shaped container, the horizontal cross-sectional shape of the rectifying inner liner is circular, elliptical or regular polygonal; the minimum inscribed circle diameter of the rectifying inner liner is and the height satisfy:

[0015]

[0016] wherein, D is the maximum outer diameter of the ring-like part, H is the height of the ring-like part; , Dmin and Hmin are the minimum inscribed circle diameter and height of the rectifying liner, respectively; , Dbase and Hbase are the diameter and height of the basic cavity, respectively.

[0017] Further, the profile curve of the vertical section of the center island and the rectifying liner is a first function curve, a convex function curve or a concave function curve; by adjusting the curve type, the pressure distribution of the particle medium flow field between the conforming container and the ring-like part is changed; wherein the average pressure at the point in the particle medium flow field satisfies the formula:

[0018]

[0019] wherein, P is the average pressure at the point r in the particle medium flow field, which is composed of the static pressure and the dynamic pressure ; is the coordinate matrix; is the mass density; is the static friction coefficient between the particle and the wall surface; is the force steering coefficient; is the gravitational acceleration; is the filling width of the particle medium when the filling height is ; is the absolute velocity of the particle medium; is the exponential function with base 2.718.

[0020] Further, the center island is fixedly connected with the basic cavity; by designing the geometric parameters to match the rotating speed of the ring-like part , an alternating pressure distribution flow field in the ring is constructed; wherein the instantaneous alternating pressure of the flow field satisfies:

[0021]

[0022] wherein, P is the instantaneous alternating pressure; is the amplitude of the pressure fluctuation; is the steering coefficient of the ring-like part, taking values of -1, 0, 1; is the angular velocity of the pressure fluctuation; is the rotating speed of the ring-like part.

[0023] Furthermore, the first harmonic excitation is generated. At that time, the differential equation of motion of the center of mass of the amplified vibrating body satisfies:

[0024]

[0025] Generate second harmonic excitation At that time, the differential equation of motion of the center of mass of the principal oscillating body satisfies:

[0026]

[0027] in, The centroids of the amplifying vibrator and the principal vibrator are respectively along... Displacement in direction; The centroids of the amplifying vibrator and the principal vibrator are respectively along... Angular displacement in direction; for The second derivative; for The first derivative; These are the participating masses of the amplifying vibrator and the principal vibrator, respectively. The mass of the conformal container; The total mass of the polishing media placed in the conformal container; The vibration isolation springs are respectively direction and Spring stiffness in the direction; The main oscillation springs are respectively in direction and Spring stiffness in the direction; The vibration isolation springs are respectively direction and Directional spring damping, The main oscillation springs are respectively in direction and Directional spring damping; The main vibrating body around Moment of inertia of the shaft; , These are the simple harmonic excitation vibration frequencies of the amplifying vibrator and the main vibrator, respectively. For time; Index of matrix elements; Wildcards represent any character;

[0028] First harmonic excitation satisfy:

[0029]

[0030] Second harmonic excitation satisfy:

[0031]

[0032] wherein, is the eccentric mass of the first vibration motor, is the eccentricity of the first vibration motor, is the angular displacement of the first vibration motor, is the number of the first vibration motor, ; ; is the horizontal distance between the center of mass 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.

[0033] Further, the displacement of the center of mass of the main vibration body in the direction is , the angular displacement of the main vibration body in the direction is , the displacement of the center of mass of the amplification vibration body in the direction is , and the angular displacement of the amplification vibration body in the direction is

[0034]

[0035] In the formula, is the amplitude component of the center of mass of the amplification vibration body under the action of the first simple harmonic excitation ; is the amplitude component of the center of mass of the amplification vibration body under the action of the second simple harmonic excitation ; is the amplitude component of the center of mass of the main vibration body under the action of the first simple harmonic excitation ; is the amplitude component of the center of mass of the main vibration body under the action of the second simple harmonic excitation ; is the angular amplitude component of the center of mass of the main vibration body under the action of the first simple harmonic excitation ; is the angular amplitude component of the center of mass of the main vibration body under the action of the second simple harmonic excitation ; is the phase difference between the displacement of the amplification vibration body and the first simple harmonic excitation ; is the phase difference between the displacement of the amplification vibration body and the second simple harmonic excitation ; is the phase difference between the displacement of the main vibration body and the first simple harmonic excitation ; is the phase difference between the displacement of the main vibration body and the second simple harmonic excitation .

[0036] The application also provides the following technical scheme: a method for resonant vibration conformal polishing and grinding of ring-shaped parts, comprising the following steps:

[0037] S1, according to the size range of the ring-shaped part, the center island table and the rectifying inner liner, sequentially position and install from small to large, and fix the rectifying inner liner and the basic cavity; the ring-shaped part is clamped by the clamping jaw, the horizontal drive and the vertical drive are adjusted, the ring-shaped part is located in the conformal container, and it is ensured that the axis of the ring-shaped part coincides with that of the conformal container, and the height from the bottom of the conformal container is 50-200 mm;

[0038] S2, the processing medium is filled into the conformal container; the particle shape of the processing medium is selected to be spherical, oblique cylindrical, triangular prism, conical or irregular shape with different sizes, and the filling amount is 50-80%;

[0039] S3, the third vibration motor and the fourth vibration motor are started, the vibration frequency is set to 15-60 Hz; the first vibration motor and the second vibration motor are started, the vibration frequency is set to 15-60 Hz; the conformal container is driven to perform compound vibration with a vibration frequency of 15-60 Hz, an amplitude of 0.5-3 mm and a phase angle of 0.05-1°; the main shaft drive is started to drive the ring-shaped part to perform forward and reverse alternating rotary motion at 5-100 r / min;

[0040] S4, after the polishing and grinding are completed, the first vibration motor, the second vibration motor, the third vibration motor, the fourth vibration motor and the main shaft drive are stopped, the horizontal drive and the vertical drive are adjusted, the clamping jaw is loosened, and the ring-shaped part is unloaded;

[0041] S5, whether the ring-shaped part meets the processing requirements is checked after cleaning and drying, otherwise, the step S1 is returned; if yes, the ring-shaped part is packed, the processing medium is cleaned and saved.

[0042] Compared with the prior art, the present application provides a multi-resonant excitation conformal polishing device and method for ring-shaped parts, which adopts a four-machine reverse split driving mechanical vibration system with double-mass and double-excitation, realizes high-frequency and large-amplitude composite vibration of the conformal container, so as to drive the particle medium to perform efficient longitudinal spiral motion around the ring-shaped part; by adjusting the vertical section profile curve of the central island table and the rectifier inner liner, the particle flow field pressure distribution between the conformal container and the ring-shaped part can be optimized, and the problem of uneven processing of the surface along the height direction in the traditional processing is significantly improved; at the same time, the geometric constraint of the ring-shaped part rotation and the conformal container not only improves the relative motion between the particle medium and the ring-shaped part, but also forms an alternating stress flow field in the ring-shaped part, successfully overcoming the problem of inconsistent processing efficiency of the inner and outer surfaces caused by the fragmentation of the ring-shaped part to the particle flow field; the present application can solve the problems of low processing efficiency, uneven processing and poor surface quality of the ring-shaped parts such as the casing and the flame tube in the traditional finishing processing method, improve the processing precision and surface quality of the ring-shaped parts, and reduce the processing cost. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0044] Figure 1 A principle diagram of a multi-resonant excitation conformal polishing device for ring-shaped parts provided by the present application;

[0045] Figure 2 A principle diagram of a multi-resonant excitation conformal polishing device for ring-shaped parts provided by the present application;

[0046] Figure 3 A mechanical model diagram of a multi-resonant excitation conformal polishing device for ring-shaped parts provided by the present application;

[0047] Figure 4 A structure diagram of a rotating system in a multi-resonant excitation conformal polishing device for ring-shaped parts provided by the present application;

[0048] Figure 5 A structure and busbar type diagram of a conformal container in a multi-resonant excitation conformal polishing device for ring-shaped parts provided by the present application;

[0049] Figure 6 Another structure and busbar type diagram of a conformal container in a multi-resonant excitation conformal polishing device for ring-shaped parts provided by the present application;

[0050] Figure 7 Figure 1 is a schematic diagram of adjusting the mounting angle of the third vibration motor and the fourth vibration motor in the multi-harmonic excitation adaptive conformal polishing device for ring-shaped parts to change the influence relationship of the second simple harmonic excitation on the vertical amplitude and the swing amplitude around the vertical axis of the main vibration body according to the present application;

[0051] Figure 8 Figure 2 is a schematic diagram of the displacement response of different main vibration spring stiffness and the main vibration body mass when the vibration frequency is 25 Hz in the multi-harmonic excitation adaptive conformal polishing device for ring-shaped parts according to the present application;

[0052] Figure 9 Figure 3 is a schematic diagram of the displacement trajectory of each point on the adaptive container in the multi-harmonic excitation adaptive conformal polishing device for ring-shaped parts according to the present application;

[0053] Figure 10 Figure 4 is a rigid and scattered coupling simulation result of the multi-harmonic excitation adaptive conformal polishing of the ring-shaped casing in the multi-harmonic excitation adaptive conformal polishing device for ring-shaped parts according to the present application;

[0054] Figure 11 Figure 5 is a surface topography and orifice enlargement diagram of the thin-walled flame tube before polishing in the multi-harmonic excitation adaptive conformal polishing device for ring-shaped parts according to the present application.

[0055] Figure 12 Figure 6 is a surface topography and orifice rounding effect diagram of the thin-walled flame tube after polishing in the multi-harmonic excitation adaptive conformal polishing device for ring-shaped parts according to the present application.

[0056] In the figure: 1-main vibration body; 101-container fixed frame; 102-third vibration motor; 103-fourth vibration motor; 2-adaptive container; 201-basic cavity; 202-center island table; 203-rectifying lining; 204-processing medium; 3-rotation system; 301-ring-shaped part; 302-clamping jaw; 303-main shaft drive; 304-horizontal drive; 305-vertical drive; 306-movable truss; 4-main vibration spring; 5-amplification vibration body; 501-first vibration motor; 502-second vibration motor; 6-vibration isolation spring; 7-supporting seat. DETAILED DESCRIPTION

[0057] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0058] Example 1:

[0059] As shown in Figure 1 , Figure 2 and Figure 4 : a multi-harmonic excitation conformal polishing device for ring-shaped parts, comprising a main vibration body 1, a conformal container 2, a rotating system 3, a main vibration spring 4, an amplification vibration body 5, a vibration isolation spring 6 and a support seat 7; wherein the first side of the amplification vibration body 5 is connected to the support seat 7 through the vibration isolation spring 6; the first side of the amplification vibration body 5 is fixedly provided with a first vibration motor 501 and a second vibration motor 502 of the same speed in opposite directions to generate a first simple harmonic excitation in the vertical direction;

[0060] Specifically, according to the mechanical model shown in Figure 3 , when the first simple harmonic excitation is generated , the motion differential equation of the centroid of the amplification vibration body 5 satisfies:

[0061]

[0062] The second side of the main vibration body 1 and the amplification vibration body 5 are connected through the main vibration spring 4;

[0063] The main vibration body 1 comprises a container fixing frame 101 for accommodating the conformal container 2, and a third vibration motor 102 and a fourth vibration motor 103 of the same speed in opposite directions are arranged at a preset angle on the symmetric position outside the container fixing frame 101 to generate a second simple harmonic excitation in the vertical direction and around the vertical axis;

[0064] When the second simple harmonic excitation is generated , the motion differential equation of the centroid of the main vibration body 1 satisfies:

[0065]

[0066] wherein, are the displacements of the centroids of the amplification vibration body and the main vibration body along the direction respectively; are the angular displacements of the centroids of the amplification vibration body and the main vibration body along the direction respectively; is the second derivative of ; is the first derivative of ; are the vibration participating masses of the amplification vibration body and the main vibration body respectively; is the mass of the conformal container; is the total mass of the polishing medium placed in the conformal container; are the spring stiffnesses of the vibration isolation spring in the direction and the direction respectively; are the spring stiffnesses of the main vibration spring in the direction and the spring stiffness in the direction; respectively the spring stiffness in the direction of the primary vibration body in the direction of the primary vibration body in the direction respectively the spring stiffness in the direction of the primary vibration body in the direction of the primary vibration body in the direction is the moment of inertia of the primary vibration body about the axis , and in addition is the moment of inertia of the amplified vibration body about the axis ; , respectively the simple harmonic excitation vibration frequency of the amplified vibration body and the primary vibration body; is the time; is the matrix element index; is a wildcard representing any character;

[0067] As shown in Figure 3 , the first simple harmonic excitation satisfies:

[0068]

[0069] The second simple harmonic excitation satisfies:

[0070]

[0071] wherein is the eccentric mass of the nth vibration motor, is the eccentricity of the nth vibration motor, is the angular displacement of the vibration motor, is the vibration motor number, ; ; is the horizontal distance between the centers of mass of the third vibration motor and the fourth vibration motor; is the included angle between the third vibration motor and the fourth vibration motor in the horizontal plane. The displacement of the center of mass of the amplified vibration body 5 in the direction is

[0072] , the displacement of the center of mass of the primary vibration body 1 in the direction is , the angular displacement in the direction is , and the angular displacement in the direction is , satisfying:

[0073]

[0074] wherein is the displacement of the center of mass of the amplified vibration body in the first simple harmonic excitation Amplitude components under action; The center of mass of the amplifying vibrator is excited by the second simple harmonic excitation. Amplitude components under action; The center of mass of the main oscillator is excited by the first simple harmonic excitation. Amplitude components under action; The center of mass of the main vibrating body is excited by the second simple harmonic excitation. Amplitude components under action; The center of mass of the main oscillator is excited by the first simple harmonic excitation. Angular amplitude components under action; The center of mass of the main vibrating body is excited by the second simple harmonic excitation. Angular amplitude components under action; To amplify the displacement of the vibrating body and the first harmonic excitation The phase difference; To amplify the displacement of the vibrating body and the second harmonic excitation The phase difference; Displacement of the main vibrating body and first harmonic excitation The phase difference; Displacement of the main vibrating body and second harmonic excitation The phase difference.

[0075] like Figure 4 As shown, the rotation system 3 is used to clamp the ring-shaped part 301 and move the ring-shaped part 301 in the conformal container 2 according to a preset motion mode. The preset motion mode includes, but is not limited to, rotation, lateral dragging, and lifting motion in the spatial coordinate system. The rotation system 3 is a three-degree-of-freedom automated truss structure, including 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-shaped part 301. The spindle drive 303 is connected to the gripper 302, and the spindle drive 303 is connected to the horizontal drive 304. The horizontal drive 304 is connected to the vertical drive 305, and 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 mounted on the movable truss 306.

[0076] In an embodiment of the present invention, the conformal container 2 includes 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 sidewall of the basic cavity 201, and the central island 202 is fixedly disposed within the basic cavity 201 and fixedly connected to the bottom center of the basic cavity 201, such as... Figure 5 and Figure 6 As shown.

[0077] The conformal container 2 is used to contain the processing medium 204, which consists of particulate media and polishing fluid.

[0078] Figure 7 In an embodiment of the present invention, according to and The expression is a schematic diagram showing the relationship between the effect of adjusting the installation angles of the third vibration motor 102 and the fourth vibration motor 103 on the vertical amplitude and the oscillation amplitude around the vertical axis of the main vibrating body 1.

[0079] In this invention, the amplifying vibrator 5 is circular, the main vibrating springs 4 are evenly arranged along the circumference of the amplifying vibrator 5, and the number of main vibrating 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 vibration isolation springs 6 is 6 to 12. Figure 8 The figure shows the displacement response under different spring stiffness and mass of the main vibrating body when the vibration frequency is 25Hz.

[0080] Figure 9 The displacement trajectories of various points on the conformal container 2 in this embodiment of the invention are shown, and the conformal container 2 and the main vibrating body 1 are also shown. , Similarly, the driving processing medium 204 makes conformal motion around the ring-shaped part 301 within the conformal container 2.

[0081] The basic cavity 201 is an open cylindrical container, and the horizontal cross-sectional shape of the rectifying liner 203 is circular, elliptical, or regular polygonal; the minimum inscribed circle diameter of the rectifying liner 203... With height satisfy:

[0082]

[0083] in, This is the maximum outer diameter of the ring-shaped part. The height of the ring-shaped part; , These are the minimum inscribed circle diameter and height of the rectifying liner, respectively; , These represent the diameter and height of the basic cavity, respectively.

[0084] The profile curves of the vertical sections of the central island 202 and the rectifying liner 203 are linear function curves, convex function curves, or concave function curves; the pressure distribution of the particulate medium flow field between the conformal container 2 and the ring-shaped part 301 is changed by adjusting the curve type; wherein, in the particulate medium flow field... The formula for calculating the average pressure at a given location satisfies:

[0085]

[0086] wherein, is the average pressure at the particle medium flow field, r is the static pressure, and the dynamic pressure ; is the coordinate matrix; is the mass density; is the static friction coefficient between the particle and the wall surface; is the force steering coefficient; is the gravitational acceleration; is the filling width of the particle medium when the filling height is ; is the absolute velocity of the particle medium; is the exponential function with base 2.718.

[0087] The central island platform 202 is fixedly connected with the basic cavity 201; an alternating pressure distribution flow field in the ring is constructed by designing the geometric parameter cooperation with the rotating speed of the ring-like part 301 ; wherein the instantaneous alternating pressure of the flow field satisfies:

[0088]

[0089] wherein, is the instantaneous alternating pressure; is the amplitude of the pressure fluctuation; is the steering coefficient of the ring-like part, and the value is -1, 0, 1; is the angular velocity of the pressure fluctuation; is the rotating speed of the ring-like part.

[0090] Embodiment 2:

[0091] This embodiment provides a rigid-dispersion coupling simulation using the device of embodiment 1, the ring-like part 301 is an engine combustion chamber case, the large end diameter is 350 mm, the small end is 290 mm, and the height is 120 mm.

[0092] A particle medium discrete element model is established by using EDEM simulation software, the simulated particle medium is 6 mm equilateral triangle high alumina porcelain, and the filling amount is 80%. According to the average pressure calculation formula and the simulation result, the horizontal section shape of the rectifying lining 203 is adjusted to be circular, the minimum inscribed circle diameter of the rectifying lining 203 is 500 mm, the height is 300 mm, and the profile curve of the vertical section of the rectifying lining 203 and the central island platform 202 is a first function curve. The parameterized model of the polishing device in embodiment 1 is established by using software RecurDyn, and the simulation equipment parameters are as follows:

[0093] Table 1 Simulation equipment parameters

[0094]

[0095] The height of the combustion chamber liner from the bottom of the adaptive container 2 is 100 mm, and the rotation speed of the combustion chamber liner is set to 25 r / min. The simulation time is 7 s, the first 2 s is the equipment start-up and EDEM generates the particle medium, and the last 5 s is the rigid scattering coupling simulation time. The motion state information of the equipment is provided by the RecurDyn multi-body dynamics software, including position, speed and acceleration. At the same time, EDEM calculates the motion, collision and contact force of the particle medium according to these equipment information, and generates the state data of the particle medium; then, EDEM sends the calculated particle contact force, displacement and speed information to RecurDyn through a pre-set interface; finally, RecurDyn receives these data and updates the motion state of its vibration system model, realizing the dynamic interaction between the two.

[0096] As shown in Figure 10 the wear depth of the sharp corner of the surface boss edge of the combustion chamber liner is greater than that of the surface, indicating that the device of embodiment 1 can effectively remove the edge burr and achieve the effect of turning sharp edges into blunt edges. At the same time, due to the adjustment of the geometric shape of the flow straightening lining 203 and the central island platform 202 of the adaptive container 2, the wear depth of the inner and outer surfaces of the combustion chamber liner along the height direction tends to be consistent, realizing the uniform and consistent polishing of the whole surface of the combustion chamber liner.

[0097] Embodiment 3:

[0098] The embodiment provides a multi-harmonic vibration adaptive polishing method for ring parts using the device of embodiment 1, the ring part to be processed 301 is a high-temperature alloy ring-shaped flame tube, the large end diameter is 250 mm, the small end is 200 mm, and the height is 80 mm, and the method comprises the following steps:

[0099] S1, according to the size range of the ring part 301, the central island platform 202 and the flow straightening lining 203, sequentially position and install from small to large, and fixedly connect the flow straightening lining 203 and the basic cavity 201; the ring part 301 is clamped by the clamping jaw 302, the horizontal drive 304 and the vertical drive 305 are adjusted, so that the ring part 301 is located in the adaptive container 2, and it is ensured that the ring part 301 coincides with the axis of the adaptive container 2, and the height from the bottom of the adaptive container 2 is 50-200 mm;

[0100] S2, the processing medium 204 is loaded into the adaptive container 2; the particle shape of the processing medium 204 is selected to be spherical, inclined cylindrical, triangular prism, conical or irregular shape with different sizes, and the filling amount is 50-80%;

[0101] S3, start the third vibration motor 102 and the fourth vibration motor 103, the vibration frequency is set to 15Hz-60Hz; start the first vibration motor 501 and the second vibration motor 502, the vibration frequency is set to 15Hz-60Hz; drive the conformance container 2 to carry out the compound vibration with the vibration frequency of 15Hz-60Hz, the amplitude of 0.5-3mm and the phase angle of 0.05-1°; start the spindle drive 303, drive the ring-like part 301 to carry out the positive and negative alternating rotary motion with the speed of 5-100r / min;

[0102] S4, after the 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 jaw 302, and unload the ring-like part 301;

[0103] S5, clean, dry and inspect the ring-like part to see whether it meets the machining requirements, otherwise return to S1; if it meets the requirements, pack the ring-like part 301, clean and save the machining medium 204.

[0104] The machining effect is as shown in Figure 11 and Figure 12 After the high-temperature alloy ring-shaped flame cylinder is polished by the device and method of multi-harmonic excitation conformance polishing, the surface roughness Ra value of the ring-shaped flame cylinder is reduced from 3.2μm to 1.2μm, the RSD value of the axial surface roughness is 0.13, and the machining uniformity is good. The surface machining tool marks of the ring-shaped flame cylinder are removed, the surface finish is obviously improved, the surface texture is greatly improved, and the finishing machining goal is achieved.

[0105] The above description of disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-harmonic vibration conformal polishing device for ring-shaped parts, characterized in that: It includes a main vibrating body (1), a conformal container (2), a rotating system (3), a main vibrating spring (4), an amplifying vibrating body (5), a vibration isolation spring (6), and a support base (7). Among them, the first side of the amplifying vibrator (5) is connected to the support base (7) through the vibration isolation spring (6); the first side of the amplifying vibrator (5) is fixedly equipped with a first vibration motor (501) and a second vibration motor (502) with opposite speeds to generate a first simple harmonic excitation in the vertical direction. The second side of the main vibrating body (1) and the amplifying vibrating body (5) are connected by the main vibrating spring (4); The main vibrating body (1) includes a container fixing frame (101) for accommodating the conformal container (2), and a third vibration motor (102) and a fourth vibration motor (103) with opposite speeds are set at a preset angle on the symmetrical position outside the container fixing frame (101) to generate a second simple harmonic excitation that swings in the vertical direction and about the vertical axis. The conformal container (2) includes 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 sidewall of the basic cavity (201), and the central island (202) is fixedly installed in the basic cavity (201) and fixedly connected to the bottom center of the basic cavity (201); the conformal container (2) is used to contain the processing medium (204) composed of particulate media and polishing fluid. The profile curves of the vertical sections of the central island (202) and the rectifying liner (203) are linear function curves, convex function curves, or concave function curves; the pressure distribution of the particulate medium flow field between the conformal container (2) and the ring-shaped part (301) is changed by adjusting the curve type; wherein, in the particulate medium flow field, in The formula for calculating the average pressure at a given location satisfies: in, For particulate media flow field r The average pressure at that point is determined by static pressure. With dynamic pressure constitute; It is a coordinate matrix; Mass density; The static friction coefficient between the particle and the wall surface; It is the force steering coefficient; It is the acceleration due to gravity; The particulate medium filling height is The fill width at that time; The absolute velocity of the particulate medium; It is an exponential function with base 2.718; The central island platform (202) is fixedly connected to the basic cavity (201); the rotational speed of the ring-shaped part (301) is determined by designing geometric parameters. An alternating pressure distribution flow field is constructed within the ring; wherein the instantaneous alternating pressure of the flow field is... satisfy: in, For instantaneous alternating pressure; The amplitude of the pressure pulsation; The turning coefficient for ring-shaped parts takes values ​​of -1, 0, and 1. This refers to the pressure pulsation angular velocity. For the rotational speed of the ring-shaped part; The rotation system (3) is used to clamp the ring-shaped part (301) and make the ring-shaped part (301) move in three degrees of freedom in the conformal container (2), including rotation about its own axis, translation along the axis direction and translation perpendicular to the axis direction.

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

3. The multi-harmonic vibration conformal polishing device for ring-shaped parts according to claim 1, characterized in that: The rotating system (3) is a three-degree-of-freedom automated truss structure. The rotating system (3) includes 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 grip ring-shaped parts (301). The spindle drive (303) is connected to the gripper (302), the spindle drive (303) is connected to the horizontal drive (304), and the horizontal drive (304) is connected to the vertical drive (305). The gripper (302) is controlled to move in three degrees of freedom in the spatial coordinate system by 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 set on the movable truss (306).

4. The multi-harmonic vibration conformal polishing device for ring-shaped parts according to claim 1, characterized in that: The basic cavity (201) is an open cylindrical container, and the horizontal cross-sectional shape of the rectifying liner (203) is circular, elliptical, or regular polygonal; the minimum inscribed circle diameter of the rectifying liner (203) is... With height satisfy: in, This is the maximum outer diameter of the ring-shaped part. The height of the ring-shaped part; , These are the minimum inscribed circle diameter and height of the rectifying liner, respectively; , These represent the diameter and height of the basic cavity, respectively.

5. The multi-harmonic vibration conformal polishing device for ring-shaped parts according to claim 1, characterized in that: Generate the first harmonic excitation At that time, the differential equation of motion of the center of mass of the amplified vibrating body (5) satisfies: Generate second harmonic excitation At that time, the differential equation of motion of the center of mass of the principal oscillator (1) satisfies: in, The centroids of the amplifying vibrator and the principal vibrator are respectively along... Displacement in direction; The centroids of the amplifying vibrator and the principal vibrator are respectively along... Angular displacement in direction; for The second derivative; for The first derivative; These are the participating masses of the amplifying vibrator and the principal vibrator, respectively. The mass of the conformal container; The total mass of the polishing media placed in the conformal container; The vibration isolation springs are respectively direction and Spring stiffness in the direction; The main oscillation springs are respectively in direction and Spring stiffness in the direction; The vibration isolation springs are respectively direction and Directional spring damping, The main oscillation springs are respectively in direction and Directional spring damping; The main vibrating body around Moment of inertia of the shaft; , These are the simple harmonic excitation vibration frequencies of the amplifying vibrator and the main vibrator, respectively. For time; Index of matrix elements; Wildcards represent any character; First harmonic excitation satisfy: Second harmonic excitation satisfy: in, For the first The eccentric mass of a vibration motor For the first The eccentricity of a vibration motor This represents the angular displacement of the vibrating motor. Number the vibration motor. ; ; The horizontal distance between the centers of mass of the third and fourth vibrating motors; The angle between the third and fourth vibrating motors on the horizontal plane.

6. The multi-harmonic vibration conformal polishing device for ring-shaped parts according to claim 1, characterized in that: The center of mass of the principal oscillator (1) along The displacement in the direction is ,along The angular displacement in the direction is The center of mass of the amplified vibrator (5) along Displacement in direction satisfy: In the formula, The center of mass of the amplifying vibrating body is excited by the first simple harmonic excitation. Amplitude components under action; The center of mass of the amplifying vibrator is excited by the second simple harmonic excitation. Amplitude components under action; The center of mass of the main oscillator is excited by the first simple harmonic excitation. Amplitude components under action; The center of mass of the main vibrating body is excited by the second simple harmonic excitation. Amplitude components under action; The center of mass of the main oscillator is excited by the first simple harmonic excitation. Angular amplitude components under action; The center of mass of the main vibrating body is excited by the second simple harmonic excitation. Angular amplitude components under action; To amplify the displacement of the vibrating body and the first harmonic excitation The phase difference; To amplify the displacement of the vibrating body and the second harmonic excitation The phase difference; Displacement of the main vibrating body and first harmonic excitation The phase difference; Displacement of the main vibrating body and second harmonic excitation The phase difference.

7. A method for multi-harmonic vibration conformal polishing of ring-shaped parts, performed based on the multi-harmonic vibration conformal polishing apparatus for ring-shaped parts as described in any one of claims 1-6, characterized in that... The method includes the following steps: S1. Based on the size range of the ring-shaped part (301), the central island (202), and the rectifier liner (203), position and install them in order from small to large, and fix the rectifier liner (203) to the basic cavity (201); clamp the ring-shaped part (301) with the gripper (302), adjust the horizontal drive (304) and the vertical drive (305) so that the ring-shaped part (301) is located in the conformal container (2), ensuring that the axis of the ring-shaped part (301) coincides with that of the conformal container (2), and the height from the bottom of the conformal container (2) is 50-200mm; S2, the processing medium (204) is loaded into the conformal container (2); the particle shape of the processing medium (204) is selected as spherical, oblique cylindrical, triangular prism or conical, and the filling amount is 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 conformal 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 main shaft drive (303) to drive the ring part (301) to perform a forward and reverse alternating rotational motion of 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), release the gripper (302) and remove the ring-shaped part (301). 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 (301), clean and store the processing medium (204).

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