A non-contact positioning and alignment device and method for rotating parts of a casing with a coating.

Abstract

The present invention discloses a non-contact positioning and alignment device and method for casing rotating body parts with coating layers, comprising an eddy current sensor, a machine vision device, a detection control device, and a centering and tilting adjustment device; wherein the eddy current sensor and the machine vision device are installed at the end of the detection control device; the centering and tilting adjustment device is a hollow structure, installed on a processing turntable; the detection control device is installed on the processing turntable through the hollow structure. The non-contact positioning and alignment device and method for casing rotating body parts with coating layers of the present invention can effectively solve the positioning detection problem of rotating body parts with coating layers, can quickly and accurately realize the automatic alignment problem of part eccentricity and tilt, and greatly improve the accuracy and efficiency of aircraft engine casing processing positioning and alignment.

Description

Technical Field

[0001] The invention relates to the technical field of aerospace geometry measurement, and in particular to a non-contact positioning and alignment device and method for a casing rotary body part with a coating layer. Background Art

[0002] With the requirements of lightweight design of aircraft engines, a large number of reinforcing rib structures are designed in the engine casing, and the structural form is becoming more and more complex. In order to solve the processing of these complex surface parts, chemical milling processing technology is adopted in the manufacturing process of aircraft engines. The engraving of chemical milling patterns is a key step in the entire casing chemical milling process. It is to engrave the designed pattern on the protective layer of the part to be chemically milled and realize peeling. At present, lasers are widely used at home and abroad to engrave the chemical milling patterns of parts. Since the engraved engine casing parts are completely covered and protected by the coating layer during the actual processing, the engraving positioning and alignment of the aircraft engine casing is a non-contact positioning and alignment process for non-metallic coating parts. The core difficulties include: non-contact detection of the coating layer, coaxiality detection of the rotating cylinder parts, automatic alignment of eccentricity and deflection angle, etc.

[0003] At present, there are two main methods for positioning and aligning the domestic engine casing manufacturing process: the traditional rotary axis measurement method and three-coordinate detection. Among them, the traditional rotary axis measurement method is mainly based on manual testing with a micrometer, and the center position of the casing is constantly adjusted through contact measurement with a micrometer. This method is time-consuming, inefficient, and requires workers to have rich experience, which is difficult to meet the needs of engine manufacturing development. The three-coordinate measuring machine can also realize the coaxiality positioning detection of the cylinder parts, but the three-coordinate measurement is generally performed independently and is mainly oriented to the detection process. The results after the detection are difficult to adjust the actual position, and it is difficult to directly perform positioning and alignment on the processing equipment.

[0004] Many scholars have conducted research on the coaxiality detection during the assembly process of aircraft engine casings. Harbin Institute of Technology proposed a method and device for the electric drive assembly of double-column aircraft engine rotors based on eddy current sensors. The device measures the concentricity and verticality of each rotor through eddy current sensors, and calculates the coaxiality weight of each rotor. Then, the coaxiality weight of each rotor is vector-optimized to obtain the assembly angle of each rotor. Beijing Institute of Aeronautical Precision Mechanics of China Aviation Industry Corporation proposed a device for measuring the geometric deformation of large annular casing parts. It uses non-contact distance measurement sensors to achieve accurate measurement of deformation, and obtains the eccentric displacement and contour shape parameters of the deformed annular parts to be measured through budgeting. Beijing Institute of Technology proposed a method for coaxiality detection and adjustment of aircraft engine casings. First, the position coordinates of each point of the casing relative to the rotation center of the turntable are measured, and then the position of the casing is calculated by least squares fitting, so as to measure and adjust the coaxiality of various components on the engine.

[0005] Based on the above research results, the existing detection methods are mainly aimed at the assembly, geometric monitoring and coaxiality detection of the casing. It is difficult to solve the positioning detection problem of the casing parts with coating layers under non-contact conditions. After detection, it is also difficult to automatically locate and align on the equipment in the current manufacturing status. Summary of the invention

[0006] The purpose of the present invention is to overcome the problem of difficulty in positioning and aligning aircraft engines with coatings in the prior art, and to propose a positioning and alignment device and method for processing aircraft engine casing parts with coatings, which can achieve positioning and alignment of aircraft engine casing parts with coatings, and at the same time provide a device and method for positioning and alignment of other parts with coatings.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] A positioning and alignment device for aircraft engine casing parts with a coating layer comprises: a machine vision device (1), an eddy current sensor (2), a detection control device (3), and a centering and tilting device (4); the machine vision device (1) is installed on the attitude rotating motor of the detection control device (3) through a sensor mounting plate (3-3); the eddy current sensor (2) is installed on the attitude rotating motor of the detection control device (3) through a mounting plate (3-3), so as to realize the position measurement of the metal parts with the coating layer. The detection control device (3) and the centering and tilting device are installed on a processing turntable (5), and the coaxiality with the processing turntable (5) is within a specified error range.

[0009] Furthermore, the detection control device (3) comprises: a sensor mounting plate (3-3), a posture control motor (3-2), an X-axis position control device (3-1), an X-axis mounting plate (3-4), a Z-axis position control device (3-5), a Z-axis guide rail (3-6), a Z-axis mounting plate (3-7), a column (3-8), a mounting platform (3-9), and a direct drive motor (3-10); the upper end of the direct drive motor (3-10) is fixedly connected to the mounting platform (3-9), and the lower side is fixedly connected to the processing turntable (5); the lower end surface of the column (3-8) is fixedly connected to the mounting platform (3-9), and the Z-axis position control device (3-5) is connected to the processing turntable (5). The device is installed on a column via a Z-direction guide rail (3-6) and a Z-direction mounting plate (3-7); an X-direction position control device (3-1) is installed on the Z-direction position control device via an X-direction mounting plate (3-4); a posture control motor (3-2) is fixedly connected to the X-direction position control device; a sensor mounting plate (3-3) is installed on the posture control motor (3-2); the detection control device (3) drives the eddy current sensor (2) and the machine vision device (1) to achieve precise position adjustment in both the X-direction and the Z-direction; and the posture control motor (3-2) drives the eddy current sensor (2) and the machine vision device (1) to achieve precise pointing in different directions.

[0010] Furthermore, the centering and tilting device comprises: an eccentric adjustment device and a tilt adjustment device; wherein the eccentric adjustment device comprises a device base (4-10), an X-direction displacement drive mechanism (4-11), two X-direction guide rails and a slider (4-9), an X-direction movable platform (4-8), a bowl-shaped support frame base (4-5), a Y-direction displacement drive mechanism (4-7), two Y-direction guide rails and a slider (4-6); the device base (4-10) is fixedly connected to the processing turntable (5) by bolts and positioning pins; the X-direction displacement drive mechanism (4-11) is fixedly connected to one side of the upper end surface of the device base (4-10), the guide rails of the two X-direction guide rails and the slider (4-9) are fixedly connected to both sides of the upper end surface of the device base (4-10), and the X-direction displacement drive mechanism The lead screw nut pair (4-11) is installed on the lower side of the X-direction moving platform (4-8), and the upper end surfaces of the two X-direction guide rails and the slider are fixedly connected to the lower end surface of the X-direction moving platform (4-8); the lower side of the Y-direction displacement driving mechanism (4-7) is fixedly connected to one side of the upper end surface of the X-direction moving platform (4-8), the lead screw nut pair in the Y-direction displacement driving mechanism (4-7) is installed on the lower side of the bowl-shaped support frame base (4-5), the lower end surfaces of the Y-direction guide rail and the slider (4-6) are fixedly connected to both sides of the upper end surface of the X-direction moving platform (4-8), and the upper end surfaces of the Y-direction guide rail and the slider (4-6) are fixedly connected to the bowl-shaped support frame base (4-5); the eccentric adjustment device realizes the composite movement in the XY direction by the X-direction displacement driving mechanism (4-11) and the Y-direction displacement driving mechanism (4-7). The bowl-shaped support frame base (4-5) is placed above the X-direction moving platform (4-8), the X-direction moving platform is placed above the device base (4-10), and the X-direction displacement drive mechanism (4-11) and the Y-direction displacement drive mechanism (4-7) are arranged orthogonally to each other. The tilt adjustment device comprises a bowl-shaped support frame base (4-5), a spherical ball (4-4), four micro-displacement drive mechanisms (4-3), a workpiece mounting platform (4-2) and four parts mounting pressure plates (4-1), the lower ends of the four micro-displacement drive mechanisms (4-3) are fixedly connected to the end surface design position of the bowl-shaped support frame base (4-5), the spherical ball (4-4) is installed at the middle through hole support position of the bowl-shaped support frame base (4-5), the workpiece mounting platform (4-2) comprises a spherical guide component, which is installed on the spherical ball (4-4) of the bowl-shaped support frame base (4-5), and the four parts mounting pressure plates (4-1) are installed on the upper end surface of the workpiece mounting platform (4-2).

[0011] Furthermore, a through-hole structure is formed in the middle of the device base (4-10), the X-axis moving platform (4-8), the bowl-shaped support frame base (4-5), and the workpiece mounting platform (4-2) in the centering and tilting device, and the direct drive motor (3-10) of the detection and control device (3) is fixedly connected to the processing turntable (5) via the through-hole structure.

[0012] A positioning and alignment method for an aircraft engine casing part with a coating layer, the specific method process is as follows:

[0013] S1: The detection control device (3) controls the eddy current sensor (2) to reach the specified detection height position and horizontal position, based on the eddy current sensor measuring the position coordinate data of k measured points on the cross section of the aircraft engine casing with the coating layer relative to the rotation center of the turntable, changing different detection height positions H i , i=1,2,…n, and obtain n groups of outer circle contour data;

[0014] S2: Based on the least squares method, circle fitting is performed on n groups of outer circle contour data respectively, and the center point coordinate information (x i ,y i ),i=1,2,…n;

[0015] S3: Based on the least squares method, the coordinate information of the center points of N cross sections (x i ,y i ), i=1,2,…n for linear fitting, and calculate the axis equation o,(x,y) of the casing parts;

[0016] S4: According to the axis equation o, (x, y) of the casing part and the position reference axis O (x, y) of the C-axis turntable, calculate the eccentricity (Δx, Δy) and the inclination angle (θ x ,θ y ).

[0017] Further, the following steps are included: S5: the eccentricity (Δx, Δy) of the part and the inclination angle (θ x ,θ y ) is fed back to the centering and tilting device, which will automatically adjust the part's rotation center and rotation axis to coincide with the machining turntable center and reference axis.

[0018] Furthermore, the method further includes the following steps: S6: using a rotation angle detection device based on machine vision to detect the marking point reserved at the top of the casing part, and determine the one-to-one correspondence between the actual rotation angle of the casing and the C-axis rotation angle.

[0019] Compared with the prior art, the above technical solution has the following advantages.

[0020] Firstly, the present invention provides a positioning and alignment device and method for aircraft engine casing parts with a coating, which can quickly complete the two functions of positioning detection and rapid alignment during the casing processing and installation process through non-contact measurement, and can simultaneously realize positioning detection and alignment of aircraft engines with and without a coating.

[0021] Secondly, the device provided by the present invention is located inside the casing barrel, and the overall structure is compact, which effectively avoids the influence of various processing features of the casing barrel on positioning detection, and also avoids the problem of large detection device and interference with machine tool processing caused by external detection.

[0022] Again, the device provided by the present invention is installed on a workbench of the casing processing equipment, and processing can be carried out directly after positioning and alignment. The device and method provided by the present invention do not require strict position accuracy requirements for parts during the initial installation process. It is only necessary to place and install the aircraft engine casing parts in the specified position range for processing, and adjust them after completing the clamping, which can avoid position errors caused by clamping. The method involved in the present invention can automatically calculate the eccentricity and inclination of the part position, and quickly adjust it through the centering and tilting device in the device. The positioning and alignment process does not require human participation, and has low experience requirements for workers. It can save a lot of installation preparation time and greatly improve engine efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The present invention is a schematic diagram of a positioning and alignment device for an aircraft engine casing part having a coating layer.

[0024] Figure 2 The present invention is a schematic front view of a device for positioning and aligning an aircraft engine casing part with a coating layer.

[0025] Figure 3 It is an exploded diagram of the detection control device of the present invention.

[0026] Figure 4 It is an exploded view of the centering and tilting adjustment device of the present invention.

[0027] Figure 5 The present invention is an axonometric view of a device for positioning and aligning an aircraft engine casing part with a coating layer.

[0028] Figure 6 This is a partial enlarged view of the detection control device A.

[0029] In the figure, 1-machine vision device, 2-eddy current sensor, 3-detection control device, 4-centering and tilting device, 5-processing turntable, 3-3-sensor mounting plate, 3-2-attitude control motor, 3-1-X-axis position control device, 3-4-X-axis mounting plate, 3-5-Z-axis position control device, 3-6-Z-axis guide rail, 3-7-Z-axis mounting plate, 3-8-column, 3-9-mounting table, 3-10-direct drive motor, 4-1-part mounting plate, 4-2 workpiece mounting platform, 4-3-micro-displacement drive mechanism, 4-4 spherical ball, 4-5 bowl-shaped support frame base, 4-6-Y-axis guide rail and slider, 4-7-Y-axis displacement drive mechanism, 4-8-X-axis moving platform, 4-9-X-axis guide rail and slider, 4-10-device base, 4-11-X-axis displacement drive mechanism. DETAILED DESCRIPTION

[0030] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, a detailed description is given below with reference to the accompanying drawings.

[0031] like Figure 1-4 As shown, a positioning and alignment device for aircraft engine casing parts with a coating layer of the present invention comprises: a machine vision device 1, an eddy current sensor 2, a detection control device 3, and a centering and tilting device 4; the machine vision device 1 is installed on the attitude rotating motor of the detection control device 3 through a sensor mounting plate 3-3; the eddy current sensor 2 is installed on the attitude rotating motor of the detection control device 3 through a mounting plate 3-3, which can realize the position measurement of metal parts with a coating layer. The detection control device 3 and the centering and tilting device are installed on the processing turntable 5, and the coaxiality with the processing turntable 5 is within the specified error range. Among them, the machine vision device 1 can perform circumferential positioning of casing barrel parts according to the cross target point on the part. The eddy current sensor 2 can penetrate the non-metallic coating layer on the surface and measure the distance between the titanium alloy inner wall of the casing barrel and the center of the processing turntable 5, realizing non-contact measurement and reducing the error caused by uneven coating.

[0032] The detection control device 3 includes: a sensor mounting plate 3-3, a posture control motor 3-2, an X-axis position control device 3-1, an X-axis mounting plate 3-4, a Z-axis position control device 3-5, a Z-axis guide rail 3-6, a Z-axis mounting plate 3-7, a column 3-8, a mounting platform 3-9, and a direct drive motor 3-10; the upper end of the direct drive motor 3-10 is fixedly connected to the mounting platform 3-9, and the lower side is fixedly connected to the processing turntable 5; the lower end surface of the column 3-8 is fixedly connected to the mounting platform 3-9, and the Z-axis position control device 3-5 is mounted on the Z-axis guide rail 3-6 and the Z-axis mounting plate 3-7. On the column; the X-axis position control device 3-1 is installed on the Z-axis position control device through the X-axis mounting plate 3-4; the posture control motor 3-2 is fixedly connected to the X-axis position control device; the sensor mounting plate 3-3 is installed on the posture control motor 3-2; the detection control device 3 drives the eddy current sensor 2 and the machine vision device 1 to achieve precise position adjustment in both the X and Z directions; the posture control motor 3-2 drives the eddy current sensor 2 and the machine vision device 1 to achieve precise pointing in different directions; the direct drive motor 3-10 is ensured to be coaxial with the processing turntable 5 during the installation process. Figure 5 This is an axonometric diagram of a device for positioning and aligning an aircraft engine casing part with a coating layer according to the present invention. Figure 6 This is a partial enlarged view of the detection control device A.

[0033] The centering and tilting device comprises: an eccentric adjustment device and a tilt adjustment device; wherein the eccentric adjustment device comprises a device base 4-10, an X-direction displacement drive mechanism 4-11, two X-direction guide rails and a slider 4-9, an X-direction movable platform 4-8, a bowl-shaped support frame base 4-5, a Y-direction displacement drive mechanism 4-7, two Y-direction guide rails and a slider 4-6; the device base 4-10 is fixedly connected to the processing turntable 5 by bolts and positioning pins; the X-direction displacement drive mechanism 4-11 is fixedly connected to one side of the upper end surface of the device base 4-10, and the guide rails of the two X-direction guide rails and the slider 4-9 are fixedly connected to both sides of the upper end surface of the device base 4-10, and the X-direction displacement drive mechanism 4-11 The middle lead screw nut pair is installed on the lower side of the X-direction moving platform 4-8, and the upper end surfaces of the two X-direction guide rails and the slider are fixedly connected to the lower end surface of the X-direction moving platform 4-8; the lower side of the Y-direction displacement driving mechanism 4-7 is fixedly connected to one side of the upper end surface of the X-direction moving platform 4-8, and the middle lead screw nut pair of the Y-direction displacement driving mechanism 4-7 is installed on the lower side of the bowl-shaped support frame base 4-5, and the lower end surfaces of the Y-direction guide rail and the slider 4-6 are fixedly connected to both sides of the upper end surface of the X-direction moving platform 4-8, and the upper end surfaces of the slider of the Y-direction guide rail and the slider (4-6) are fixedly connected to the bowl-shaped support frame base 4-5; the eccentric adjustment device is realized by the X-direction displacement driving mechanism 4-11 and the Y-direction displacement driving mechanism 4-7 to realize the composite movement in the XY direction. The bowl-shaped support frame base 4-5 is placed above the X-direction moving platform 4-8, and the X-direction moving platform is placed above the device base 4-10, and the X-direction displacement driving mechanism 4-11 and the Y-direction displacement driving mechanism 4-7 are arranged orthogonally to each other. The tilt adjustment device comprises a bowl-shaped support frame base 4-5, a spherical ball 4-4, four micro-displacement drive mechanisms 4-3, a workpiece mounting platform 4-2 and four parts mounting pressure plates 4-1. The lower ends of the four micro-displacement drive mechanisms 4-3 are fixedly connected to the designed position of the end face of the bowl-shaped support frame base 4-5, the spherical ball 4-4 is installed at the supporting position of the middle through hole of the bowl-shaped support frame base 4-5, the workpiece mounting platform 4-2 comprises a spherical guide component, which is installed on the spherical ball 4-4 of the bowl-shaped support frame base 4-5, and the four parts mounting pressure plates 4-1 are installed on the upper end face of the workpiece mounting platform 4-2.

[0034] The centering and tilting device described herein has a through-hole structure in the middle of the device base 4-10, the X-axis moving platform 4-8, the bowl-shaped support frame base 4-5, and the workpiece mounting platform 4-2, and the direct-drive motor 3-10 of the detection and control device 3 is fixedly connected to the processing turntable 5 through the through-hole structure.

[0035] The X-direction displacement drive mechanism 4-11 includes a motor, a reducer, a coupling, a lead screw, a lead screw nut pair, and together with two X-direction guide rails and a slider 4-9 constitute a lead screw slider guide rail assembly, driving the X-direction mobile platform to achieve displacement in the X-axis direction.

[0036] The Y-direction displacement drive mechanism 4-7 includes a motor, a reducer, a coupling, a lead screw, a lead screw nut pair, and together with two Y-direction guide rails and a slider 4-6 constitute a lead screw slider guide rail assembly, and a bowl-shaped support frame base 4-5 realizes displacement in the X-axis direction.

[0037] The detection control device 3, the centering and tilting device 4 and the machine tool processing turntable 5 have strict installation and positioning requirements, and a one-to-one correspondence between the center coordinate system of the centering and tilting device workpiece installation and the machine tool coordinate system can be established;

[0038] The present invention provides a positioning and alignment device and method for an aircraft engine casing part having a coating layer, and the specific process is as follows:

[0039] S1: Place the casing parts with the coating layer on the workpiece mounting platform 4-2 of the centering and tilting adjustment device 4 by hoisting, and press the casing parts by using four parts mounting pressing plates 4-1.

[0040] S2: Control the detection control device 3Z to adjust the position control device 3-5 to the eddy current sensor 2 to the specified interface height.

[0041] S3: Control the detection control device 3X to direct the position control device 3-1 to move the eddy current sensor 2 close to the inside of the casing barrel to a detectable interval position.

[0042] S4: Control the detection control device 3 to control the direct drive motor 3-10 to rotate. When the eddy current sensor 2 measures different rotation angle positions, based on the position coordinate data of k measured points on the cross section of the aircraft engine casing with the coating layer relative to the rotation center of the turntable measured by the eddy current sensor, change different detection height positions H i , i=1,2,…n, and n groups of outer circle contour data are obtained.

[0043] S5: Repeat S2-S4 to obtain the inner wall profile data of the cylinder with different cross sections.

[0044] S6: Based on the least squares method, circle fitting is performed on n groups of outer circle contour data respectively, and the center point coordinate information (x i ,y i ),i=1,2,…n.

[0045] S7: Based on the least squares method, the coordinate information of the center points of N cross sections (x i ,y i ),i=1,2,…n for linear fitting, and calculate the axis equation o,(x,y) of the casing parts.

[0046] S8: According to the axis equation o, (x, y) of the casing part and the position reference axis O (x, y) of the C-axis turntable, calculate the eccentricity (Δx, Δy) and the inclination angle (θ x ,θ y ).

[0047] S9: The eccentricity (Δx, Δy) and the inclination angle (θ x ,θ y ) is fed back to the centering and tilting adjustment device.

[0048] S10: The centering and tilting device automatically adjusts the rotation center and rotation axis of the part to coincide with the center of the machining turntable and the reference axis according to the feedback data in S9, so as to achieve the coaxiality of the rotation center of the casing and the machining turntable.

[0049] S11: Based on the machine vision device, the rotation angle detection device of the receiver detects the cross target point reserved on the top of the receiver part to determine the one-to-one correspondence between the actual rotation angle of the receiver and the C-axis rotation angle.

[0050] S12: The aircraft engine casing parts with coating are completely aligned and the subsequent engraving process begins.

[0051] In the actual manufacturing process, the centering and tilting device of the present invention can also be completed manually, that is, the operator can adjust the cylinder rotation center and the tilt angle in real time to be coaxial with the C-axis selection center according to the distance reading from the inner wall of the casing cylinder parts measured by the position sensor, so as to achieve the purpose of convenience and speed.

[0052] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for positioning and aligning an aircraft engine casing part having a coating layer, which uses a non-contact positioning and aligning device for a casing rotating body part having a coating layer; The non-contact positioning and alignment device for a casing rotating body part with a coating layer comprises a machine vision device (1), an eddy current sensor (2), a detection control device (3), and a centering and tilting adjustment device (4); the machine vision device (1) is installed on the attitude rotating motor of the detection control device (3) through a sensor mounting plate (3-3); the eddy current sensor (2) is installed on the attitude rotating motor of the detection control device (3) through a sensor mounting plate (3-3); the detection control device (3) and the centering and tilting adjustment device are fixedly connected to a processing turntable (5); The detection control device (3) comprises: A sensor mounting plate (3-3), a posture control motor (3-2), an X-axis position control device (3-1), an X-axis mounting plate (3-4), a Z-axis position control device (3-5), a Z-axis guide rail (3-6), a Z-axis mounting plate (3-7), a column (3-8), a mounting platform (3-9), and a direct drive motor (3-10); the upper end surface of the direct drive motor (3-10) is fixedly connected to the mounting platform (3-9), and the lower end surface is fixedly connected to the processing turntable (5); the lower end surface of the column (3-8) is fixedly connected to the mounting platform (3-9), and the Z-axis position control device (3-5) is connected to the Z-axis guide rail (3-6) ) and a Z-direction mounting plate (3-7) are mounted on a column; an X-direction position control device (3-1) is mounted on the Z-direction position control device via an X-direction mounting plate (3-4); a posture control motor (3-2) is fixedly connected to the X-direction position control device; a sensor mounting plate (3-3) is mounted on the posture control motor (3-2); the detection control device (3) drives the eddy current sensor (2) and the machine vision device (1) to achieve precise position adjustment in both the X-direction and the Z-direction; and the posture control motor (3-2) drives the eddy current sensor (2) and the machine vision device (1) to achieve precise pointing in different directions; The centering and tilting device comprises: an eccentric adjustment device and a tilt adjustment device; wherein the eccentric adjustment device comprises a device base (4-10), an X-direction displacement drive mechanism (4-11), two X-direction guide rails and a slider (4-9), an X-direction moving platform (4-8), a bowl-shaped support frame base (4-5), a Y-direction displacement drive mechanism (4-7), two Y-direction guide rails and a slider (4-6); the device base (4-10) is fixedly connected to the processing turntable (5) by bolts and positioning pins; the X-direction displacement drive mechanism (4-11) is fixedly connected to one side of the upper end surface of the device base (4-10), The guide rails of the two X-direction guide rails and sliders (4-9) are fixedly connected to both sides of the upper end surface of the device base (4-10); the lead screw nut pair in the X-direction displacement driving mechanism (4-11) is installed on the lower side of the X-direction moving platform (4-8); the upper end surfaces of the sliders of the two X-direction guide rails and sliders are fixedly connected to the lower end surface of the X-direction moving platform (4-8); the lower side of the Y-direction displacement driving mechanism (4-7) is fixedly connected to one side of the upper end surface of the X-direction moving platform (4-8); the lead screw nut pair in the Y-direction displacement driving mechanism (4-7) is installed on the lower side of the bowl-shaped support frame base (4-5); the lower end surfaces of the guide rails of the Y-direction guide rails and sliders (4-6) are fixedly connected to the X-direction moving platform On both sides of the upper end surface of the Y-direction guide rail and the slider (4-6), the upper end surface of the slider is fixedly connected to the bowl-shaped support frame base (4-5); the eccentric adjustment device is realized by the X-direction displacement drive mechanism (4-11) and the Y-direction displacement drive mechanism (4-7) to realize the compound movement in the XY direction; the bowl-shaped support frame base (4-5) is placed above the X-direction moving platform (4-8), the X-direction moving platform is placed above the device base (4-10), and the X-direction displacement drive mechanism (4-11) and the Y-direction displacement drive mechanism (4-7) are arranged orthogonally to each other; the tilt adjustment device comprises a bowl-shaped support frame base (4-5) , a spherical ball (4-4), four micro-displacement drive mechanisms (4-3), a workpiece mounting platform (4-2) and four parts mounting pressure plates (4-1), wherein the lower ends of the four micro-displacement drive mechanisms (4-3) are fixedly connected to the designed end surface positions of the bowl-shaped support frame base (4-5), the spherical ball (4-4) is mounted at the supporting position of the middle through hole of the bowl-shaped support frame base (4-5), the workpiece mounting platform (4-2) comprises a spherical guide component mounted on the spherical ball (4-4) of the bowl-shaped support frame base (4-5), and the four parts mounting pressure plates (4-1) are mounted on the upper end surface of the workpiece mounting platform (4-2); The centering and tilting device has a through-hole structure in the middle of the device base (4-10), the X-axis moving platform (4-8), the bowl-shaped support frame base (4-5), and the workpiece mounting platform (4-2), and the direct drive motor (3-10) of the detection control device (3) is fixedly connected to the processing turntable (5) through the through-hole structure; The following steps are involved: S1: The detection control device (3) controls the eddy current sensor (2) to reach a specified detection height position and horizontal position, based on the position coordinate data of k measured points on the cross section of the aircraft engine casing with the coating layer relative to the rotation center of the turntable measured by the eddy current sensor (2), and changes different detection height positions H i , i=1,2,…n, and obtain n groups of outer circle contour data; S2: Based on the least squares method, circle fitting is performed on n groups of outer circle contour data respectively, and the center point coordinate information (x i ,y i ),i=1,2,…n; S3: Based on the least squares method, the coordinate information of the center points of N cross sections (x i ,y i ), i=1,2,…n for linear fitting, and calculate the axis equation o,(x,y) of the casing parts; S4: According to the axis equation o, (x, y) of the casing part and the position reference axis O (x, y) of the C-axis turntable, calculate the eccentricity (Δx, Δy) and the inclination angle (θ x ,θ y ); S5: The eccentricity (Δx, Δy) and the inclination angle (θ x ,θ y ) is fed back to the centering and tilting device, which will automatically adjust the rotation center and rotation axis of the part to coincide with the center of the machining turntable and the reference axis; S6: A rotation angle detection device based on machine vision detects the reserved mark points on the top of the receiver parts to determine the one-to-one correspondence between the actual rotation angle of the receiver and the C-axis rotation angle; S7: The aircraft engine casing parts with coating are completely aligned and the subsequent engraving process begins.

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