A local combined multi-point flexible support device for variable curvature annular thin-walled parts

Abstract

The present invention provides a local combined multi-point flexible support device for variable curvature annular thin-walled parts, which integrates a support state sensing sensor and an actuating actuator, and specifically includes a base, a lifting assembly, an auxiliary support device, an oil supply pipe, a displacement sensor, a vibration sensor, a support force sensor, and a hydraulic sensor. In the local support area, the local combined multi-point flexible support device of the present invention can adjust the spatial positions of multiple flexible support points according to the curvature size of the supported surface of the annular thin-walled part, and integrate each single-point support surface into a combined support surface with controllable curvature of the auxiliary support device, so as to ensure that the support surface of the support device is completely in contact with the supported surface of the workpiece; and convert the variables that are difficult to directly control, such as the support stiffness and damping, into adjustable variables that are easy to accurately control, such as hydraulic pressure, to achieve active compliance control of the thin-walled workpiece-support device interaction process, and ensure the support stability of the device under the influence of dynamic loads.

Description

Technical Field

[0001] The invention belongs to the field of mechanical processing and manufacturing, and in particular relates to a local combined multi-point flexible supporting device for a variable curvature annular thin-walled part. Background Art

[0002] Annular thin-walled parts, such as aircraft engine casings, gas wave refrigerator hubs, etc., play an important role in high-end equipment. Their processing accuracy and surface quality directly affect the service life and performance of the equipment. Such parts have the characteristics of large size, thin wall thickness, weak rigidity, and difficult material processing. The dynamic characteristics of thin-walled parts change with the amount of material removed and the position of the cutting contact point. The modal density frequency bands are different. Under the excitation of cutting force, large deformation, vibration, and even self-excited flutter are very likely to occur, which seriously affects the processing quality and efficiency. Introducing auxiliary support devices to increase the radial stiffness of annular thin-walled parts is one of the effective ways to achieve high-performance processing.

[0003] In the prior art, invention patent CN111113080A discloses an auxiliary fixture for suppressing vibration during cutting of thin-walled casings. The fixture uses a spring unit group and a hexagonal frame to fix the auxiliary fixture on the inner wall or outer wall of the thin-walled casing, which can effectively suppress vibration during the processing of the thin-walled casing; invention patent CN106808246A discloses an automatic auxiliary support device for thin-walled annular parts, which can automatically adjust the radial auxiliary support space position to ensure that the parts are slightly deformed after unloading and the wall thickness accuracy meets the requirements. However, it should be pointed out that most annular thin-walled parts have complex overall structures, and the radius of curvature of the supported surface changes continuously along the axial direction of the annular part. However, in the local support area, the support form adopted by the above passive / semi-active vibration reduction device is a single-body support, and the curvature of the support surface is a constant value. When the support device follows the cutting position of the tool, in each local support area, the curvature of the support surface of the support device will not be completely fitted due to the difference in curvature with the supported surface. The contact form at the support point degenerates from the desired "surface contact" to "line contact" or "point contact". If the annular thin-walled part is still supported by the theoretical support force, it will cause local contact force overload, resulting in workpiece deformation, overcutting and other processing problems, affecting the processing quality. In addition, the above support device is mainly used to control the deformation of thin-walled parts, and is rarely used in the vibration suppression process. Moreover, the process parameters such as the support force and the support position cannot be adjusted with the change of the processing state, and it is difficult to adapt to the irregular and significant changes of the multi-order modes of complex thin-walled parts under large removal, resulting in the easy mismatch of the processing system and poor retention of the vibration reduction effect. Summary of the invention

[0004] In order to solve the problems existing in the prior art, the present invention provides a local combined multi-point flexible support device for variable curvature annular thin-walled parts. In the local support area, by adjusting the spatial positions of multiple flexible support points, the support points are approximately combined into a support surface with variable curvature, ensuring that the support surface of the support device and the supported surface of the workpiece are completely in contact, effectively reducing the processing deformation of specific areas of the parts, suppressing the flutter of thin-walled parts, and realizing vibration-damping support for surfaces with different curvatures.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A partially combined multi-point flexible support device for a variable curvature annular thin-walled part, the partially combined multi-point flexible support device for a variable curvature annular thin-walled part comprising a base, a lifting assembly, an auxiliary support device, a vibration sensor, a displacement sensor, a support force sensor, a hydraulic sensor and an oil supply pipe;

[0007] The base is a disc-shaped structure, which is used to fix the lifting assembly; the lifting assembly is composed of a support seat, a lifting platform and a lifting cylinder. There are N groups of lifting cylinders, N≥2, and each group of lifting cylinders is provided with a mounting flange at the bottom, which is fixed to the base by bolts; the top of the lifting cylinder is provided with a threaded shaft, which is connected with the threaded hole on the lifting platform; the auxiliary support device is installed in the support seat by threaded connection, and the support seat is fixed to the lifting platform by bolts; the auxiliary support device and the support seat are provided with M groups, M≥3, which are evenly installed on the lifting platform along the circumferential direction by bolts; the oil supply pipe is annular, connected to the support seat by a ferrule joint, and supplies oil to each auxiliary support device in the support seat at the same time. When the cutting position changes, under the drive of the lifting cylinder, the auxiliary support device moves along the axis of the workpiece with the lifting platform, thereby realizing the axial adjustment of the support position.

[0008] The auxiliary support device comprises a plunger rod, a cylinder body, a first return spring, a first end cover, a second end cover, a mounting body, a deformable sleeve, a support column, a sealing joint, a second return spring, a third end cover and a sealing ring. The mounting body is provided with H support columns, H≥3, and the tops of the support columns are all made of elastic rubber material. In the local support area, the elastic rubber layer of each support column forms a single-point support surface under the pressure of the supported surface of the workpiece, and each single-point support surface is combined to form a support surface of the auxiliary support device. The plunger rod is a stepped shaft, and the cylinder body is provided with a stepped hole. The two are matched through the shaft hole to form an annular space between the end faces of the shaft hole for installing the first return spring. Sealing rings are installed at both ends of the plunger rod to prevent leakage of hydraulic oil. When the plunger rod moves along the axis of the cylinder body driven by the fluid pressure, the first return spring is compressed. When the hydraulic action is removed, the elastic potential energy accumulated in the first return spring is released to cause the plunger rod to return to the starting position. The first end cover is installed on the oil inlet side of the cylinder body to limit the moving position of the plunger rod. At the same time, the first end cover is provided with a main oil inlet hole, and the hydraulic oil enters the hydraulic oil circuits in the auxiliary support device through the main oil inlet hole.

[0009] The plunger rod, the cylinder body, the second end cover and the installation body are all provided with hydraulic oil circuits, which are the first oil circuit, the second oil circuit, the third oil circuit and the fourth oil circuit. When the plunger rod moves to the critical position, the hydraulic oil enters the plunger rod hydraulic oil circuit through the first oil circuit and the second oil circuit in turn, and then enters the deformable sleeve mounting hole of the installation body through the third oil circuit and the fourth oil circuit. All the deformable sleeve mounting holes are connected through through holes; the deformable sleeve is installed in the deformable sleeve mounting hole and sleeved on the supporting column, and the two are installed coaxially; the deformable sleeve is composed of a metal shaft ring and a hard plastic shaft ring, and the metal shaft ring is used to support the hard plastic shaft ring to prevent it from being crushed under the action of hydraulic oil; the metal shaft ring is provided with a mounting groove along the circumferential direction, the outer surface of the hard plastic shaft sleeve is provided with an annular groove, and the inner surface is provided with a resistance boss, and the resistance boss is nested in the mounting groove. After the hydraulic oil enters the annular groove, it squeezes the hard plastic sleeve, so that the resistance boss holds the support column tightly to limit the movement of the support column; in addition, the oil inlet side of the second end cover and the oil outlet side of the plunger rod are sealed by a sealing joint, and the non-oil inlet side of the second end cover is connected to the oil inlet side of the mounting body by bolts. A second return spring mounting hole is provided in the second end cover and the mounting body, and the second return spring is limited in the mounting hole. The second return spring is used for the extension length of each support column; the third end cover is connected to the non-oil inlet side of the mounting body by bolts, and limits the position of the deformable sleeve.

[0010] The vibration sensor is installed on the head of the main supporting column of the auxiliary supporting device to monitor the vibration signal at the supporting point of the auxiliary supporting device; the supporting force sensors are installed on the heads of the other auxiliary supporting columns to monitor the value of the supporting force at the supporting point of the auxiliary supporting device; the displacement sensor is installed inside the lifting cylinder to record the axial position of the auxiliary supporting device; the hydraulic sensor is installed on the lifting platform to monitor the fluid pressure of the oil circuit of the local combined multi-point flexible supporting device.

[0011] The present invention has the following advantages:

[0012] 1. The axial position and radial position of the support device of the present invention are dynamically adjustable without replacing the support head. According to the surface shape of the local support area of ​​the workpiece, within the local support area, by adjusting the spatial positions of multiple flexible support points, each support point is approximately combined into a support surface with a variable curvature, thereby avoiding deformation of the thin-walled workpiece due to overload of the contact force at the support, and ensuring the processing accuracy of the annular thin-walled parts.

[0013] 2. The support device of the present invention integrates support state sensing sensors and actuating actuators, converts variables that are difficult to directly control, such as support stiffness and damping, into adjustable variables that are easy to accurately control, such as hydraulics, to regulate the output stiffness and damping characteristics, thereby achieving active adaptive control of the interaction process between the thin-walled workpiece and the support device, suppressing the flutter of thin-walled parts, and ensuring the stability of the processing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the local combined multi-point flexible support device of the present invention;

[0015] Figure 2 It is a schematic diagram of the position of the local combined multi-point flexible support device of the present invention in the corresponding fixture;

[0016] Figure 3 This is a schematic diagram of the installation layout of the auxiliary support device of the present invention on the lifting platform;

[0017] Figure 4 It is a cross-sectional view of the auxiliary support device structure of the present invention;

[0018] Figure 5 A cross-sectional view of a local oil circuit structure of the auxiliary support device of the present invention;

[0019] Figure 6 This is a schematic diagram of the internal structure of the installation body of the auxiliary support device of the present invention;

[0020] Figure 7 It is a schematic diagram of the metal collar structure of the auxiliary support device of the present invention;

[0021] Figure 8It is a schematic diagram of the hard plastic sleeve structure of the auxiliary support device of the present invention.

[0022] In the figure: 1 base; 2 lifting assembly; 2-1 support seat; 2-2 lifting platform; 2-3 lifting cylinder; 2-31 mounting flange; 3 auxiliary supporting device; 3-1 plunger rod; 3-101 first oil circuit; 3-2 cylinder body; 3-201 second oil circuit; 3-3 first return spring; 3-4 first end cover; 3-41 main oil inlet hole; 3-5 second end cover; 3-501 third oil circuit; 3-6 installation body; 3-601 fourth oil circuit; 3-61 Deformable sleeve mounting hole; 3-62 through hole; 3-7 deformable sleeve; 3-71 metal shaft ring; 3-711 mounting groove; 3-72 hard plastic sleeve; 3-721 annular groove; 3-722 resistance boss; 3-8 supporting column; 3-9 sealing joint; 3-10 second return spring; 3-11 third end cover; 3-12 sealing ring; 4 vibration sensor; 5 displacement sensor; 6 bearing force sensor; 7 hydraulic sensor; 8 oil supply pipe; 9 annular thin-walled part. DETAILED DESCRIPTION

[0023] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and technical solutions.

[0024] See also Figure 1 and Figure 2 The local combined multi-point flexible support device of the variable curvature annular thin-walled part includes a base 1, a lifting component 2, an auxiliary support device 3, a vibration sensor 4, a displacement sensor 5, a support force sensor 6, a hydraulic sensor 7 and an oil supply pipe 8.

[0025] The base 1 is a disc-shaped structure for fixing the lifting assembly 2; the lifting assembly 2 is composed of a support base 2-1, a lifting platform 2-2 and a lifting cylinder 2-3, wherein the lifting cylinders 2-3 have N groups, N ≥ 2, and each group of lifting cylinders 2-3 is provided with a mounting flange 2-31 at the bottom, which is fixed to the base 1 by bolts; the top of the lifting cylinder 2-3 is provided with a threaded shaft, which is matched and connected with the threaded hole on the lifting platform 2-2; see Figure 3 , the auxiliary support device 3 is installed in the support seat 2-1 through a threaded connection, and the support seat 2-1 is fixed on the lifting platform 2-2 by bolts; the auxiliary support device 3 has M groups, M≥3, and is evenly installed on the lifting platform 2-2 along the circumferential direction by bolts; the oil supply pipe 8 is annular, connected to the support seat 2-1 through a ferrule joint, and supplies oil to each auxiliary support device 3 in the support seat 2-1. When the cutting position changes, under the drive of the lifting cylinder 2-3, the auxiliary support device 3 moves along the axis of the workpiece with the lifting platform 2-2, thereby realizing the axial adjustment of the support position.

[0026] See also Figure 3and Figure 4 The auxiliary support device 3 includes a plunger rod 3-1, a cylinder body 3-2, a first return spring 3-3, a first end cover 3-4, a second end cover 3-5, a mounting body 3-6, a deformable sleeve 3-7, a support column 3-8, a sealing joint 3-9, a second return spring 3-10, a third end cover 3-11 and a sealing ring 3-12. H support columns 3-8 are mounted on the mounting body 3-6, H ≥ 3, and the tops of the support columns 3-8 are all made of elastic rubber material. In the local support area, the elastic rubber layer of each support column 3-8 forms a single-point support surface under the extrusion of the supported surface of the workpiece, and each single-point support surface is combined to form the support surface of the auxiliary support device 3. The plunger rod 3-1 is a stepped shaft, and the cylinder body 3-2 is provided with a stepped hole. The two are matched through the shaft hole to form an annular space between the end faces of the shaft hole for installing the first return spring 3-3. Sealing rings 3-12 are installed at both ends of the plunger rod 3-1 to prevent leakage of hydraulic oil; when the plunger rod 3-1 moves along the axis of the cylinder body 3-2 driven by the fluid pressure, the first return spring 3-3 is compressed. When the hydraulic action is removed, the elastic potential energy accumulated in the first return spring 3-3 is released to cause the plunger rod 3-1 to return to the starting position; the first end cover 3-4 is installed on the oil inlet side of the cylinder body 3-2 to limit the moving position of the plunger rod 3-1. At the same time, the first end cover 3-4 is provided with a main oil inlet hole 3-41, and the hydraulic oil enters the hydraulic oil circuits in the auxiliary support device 3 through the main oil inlet hole 3-41.

[0027] See also Figure 4 and Figure 5 The plunger rod 3-1, the cylinder body 3-2, the second end cover 3-5 and the installation body 3-6 are all provided with hydraulic oil circuits, namely the first oil circuit 3-101, the second oil circuit 3-201, the third oil circuit 3-501 and the fourth oil circuit 3-601. When the plunger rod 3-1 moves to the critical position, the hydraulic oil enters the plunger rod 3-1 hydraulic oil circuit through the first oil circuit 3-101 and the second oil circuit 3-201 in sequence, and then enters the deformable sleeve installation hole 3-61 set on the installation body 3-6 through the third oil circuit 3-501 and the fourth oil circuit 3-601, see Figure 6 , all the deformable sleeve mounting holes 3-61 are connected through the through hole 3-62; the deformable sleeve 3-7 is installed in the deformable sleeve mounting hole 3-61, and is sleeved on the support column 3-8, and the two are installed coaxially; the deformable sleeve 3-7 is composed of a metal collar 3-71 and a hard plastic sleeve 3-72, and the metal collar 3-71 is used to support the hard plastic sleeve 3-72 to prevent it from being crushed under the action of hydraulic oil; see Figure 7 and Figure 8The metal shaft ring 3-71 is provided with a mounting groove 3-711 along the circumferential direction, the outer surface of the hard plastic shaft sleeve 3-72 is provided with an annular groove 3-721, and the inner surface is provided with a resistance boss 3-722, and the resistance boss 3-722 is nested in the mounting groove 3-711. After the hydraulic oil enters the annular groove 3-721, it squeezes the hard plastic sleeve 3-72, so that the resistance boss 3-722 holds the support column 3-8 tightly, limiting the movement of the support column 3-8; in addition, the oil inlet side of the second end cover 3-5 and the oil outlet side of the plunger rod 3-1 are sealed by a sealing joint 3-9, and the non-oil inlet side of the second end cover 3-5 and the oil inlet side of the mounting body 3-6 are connected by bolts. A coaxial second return spring 3-10 mounting hole is provided in the second end cover 3-5 and the mounting body 3-6, and the second return spring 3-10 is limited in the mounting hole. The second return spring 3-10 is used for the extension length of each support column 3-8; the third end cover 3-11 is connected to the non-oil inlet side of the mounting body 3-6 by bolts, and limits the position of the deformable sleeve 3-7.

[0028] The vibration sensor 4 is installed on the head of the main supporting column of the auxiliary supporting device 3 to monitor the vibration signal at the supporting point of the auxiliary supporting device 3; the supporting force sensor 6 is installed on the heads of the other auxiliary supporting columns to monitor the value of the supporting force at the supporting point of the auxiliary supporting device 3; the displacement sensor 5 is installed inside the lifting cylinder 2-3 to record the axial position of the auxiliary supporting device 3; the hydraulic sensor 7 is installed on the lifting platform 2-2 to monitor the fluid pressure of the oil circuit of the local combined multi-point flexible supporting device.

[0029] The working principle of the local combined multi-point flexible support device is as follows: first, according to the cutting position of the tool, the lifting cylinder 2-3 is controlled to move the auxiliary support device 3 to the layer section of the processed part; after the axial position of the auxiliary support device 3 is fixed, the plunger rod 3-1 is driven by the initial value of P0 pressure to push all the support columns 3-8 to move synchronously in the direction of the supported surface until the support column 3-8 is in contact with the supported surface of the annular thin-walled part 9 and fits completely, and the extension length of each support column 3-8 is controlled by compressing the second return spring 3-10, so that the top end of the support column 3-8 forms a supporting curved surface consistent with the curvature of the supported surface. At this time, Under the action of fluid pressure, each support column 3-8 is clamped to restrict its movement in the cylinder body 3-2; then, variables that are difficult to directly control, such as support stiffness and damping, are converted into adjustable variables that are easy to accurately control, such as hydraulic pressure, and the fluid pressure P is continued to increase, and the values ​​of each support force sensor 6 and hydraulic sensor 7 are read. When the support force target value F1 is reached, the fluid pressure control P is stopped to release the deformation of the workpiece; during the processing, the information of each vibration sensor 4 is read, and the dynamic characteristic parameters of the processing system are obtained by online analysis of the vibration signal. According to the dynamic model, the fluid pressure is adjusted online to enhance the output stiffness and damping characteristics of the processing system, and the flutter of the annular thin-walled part 9 is suppressed.

[0030] In summary, the local combined multi-point flexible support device dynamically adjusts the supporting force and supporting position of the supporting surface according to the processing accuracy requirements, controls the output stiffness and damping characteristics, realizes the adaptive milling of annular thin-walled parts, and ensures the processing quality of parts.

Claims

1. A local combined multi-point flexible support device for a variable curvature annular thin-walled part, characterized in that: The local combined multi-point flexible support device of the variable curvature annular thin-walled part comprises a base, a lifting assembly, an auxiliary support device, a vibration sensor, a displacement sensor, a support force sensor, a hydraulic sensor and an oil supply pipe; The base is a disc-shaped structure used to fix the lifting assembly; the lifting assembly consists of a support seat, a lifting platform and a lifting push cylinder; wherein, the lifting push cylinders are provided with N groups in total, N ≥ 2, and a mounting flange is provided at the bottom of each group of lifting push cylinders, which are fixed to the base by bolts; a threaded shaft is provided at the top of the lifting push cylinder, which is matched and connected with the threaded hole on the lifting platform; the auxiliary supporting device is installed in the supporting seat by a threaded connection, and the supporting seat is fixed to the lifting platform by bolts, and the auxiliary supporting device and the supporting seat are provided with M groups, M ≥ 3, which are evenly installed on the lifting platform in a circumferential direction by bolts; the oil supply pipe is annular, connected to the supporting seat by a ferrule joint, and supplies oil to the auxiliary supporting device in each supporting seat at the same time; when the cutting position changes, the auxiliary supporting device moves along the axis direction of the workpiece with the lifting platform under the drive of the lifting push cylinder, thereby realizing the axial adjustment of the supporting position; The auxiliary support device comprises a plunger rod, a cylinder body, a first return spring, a first end cover, a second end cover, a mounting body, a deformable sleeve, a support column, a sealing joint, a second return spring, a third end cover and a sealing ring; the mounting body is provided with H support columns, H ≥ 3, the tops of the support columns are all made of elastic rubber material, in the local support area, the elastic rubber layer of each support column forms a single-point support surface under the extrusion of the supported surface of the workpiece, and each single-point support surface is combined to form a support surface of the auxiliary support device; the plunger rod is a stepped shaft, and the cylinder body is provided with a stepped hole, and the two are connected by The shaft hole cooperates to form an annular space between the end faces of the shaft hole for installing the first return spring. Sealing rings are installed at both ends of the plunger rod to prevent leakage of hydraulic oil. When the plunger rod moves along the axis of the cylinder body under the drive of the fluid pressure, the first return spring is compressed. When the hydraulic action is removed, the elastic potential energy accumulated in the first return spring is released to cause the plunger rod to return to the starting position. The first end cover is installed on the oil inlet side of the cylinder body to limit the moving position of the plunger rod. At the same time, the first end cover is provided with a main oil inlet hole, and the hydraulic oil enters each hydraulic oil circuit in the auxiliary support device through the main oil inlet hole. The plunger rod, the cylinder body, the second end cover and the installation body are all provided with hydraulic oil circuits, which are the first oil circuit, the second oil circuit, the third oil circuit and the fourth oil circuit respectively; when the plunger rod moves to the critical position, the hydraulic oil enters the plunger rod hydraulic oil circuit through the first oil circuit and the second oil circuit in sequence, and then enters the deformable sleeve mounting hole of the installation body through the third oil circuit and the fourth oil circuit, and all the deformable sleeve mounting holes are connected through the through hole; the deformable sleeve is installed in the deformable sleeve mounting hole and is sleeved on the supporting column, and the two are installed coaxially; the deformable sleeve is composed of a metal shaft ring and a hard plastic shaft ring, and the metal shaft ring is used to support the hard plastic shaft ring to prevent it from being crushed under the action of hydraulic oil; the metal shaft ring is along the circular A mounting groove is provided in the circumferential direction, an annular groove is provided on the outer surface of the hard plastic sleeve, and a resistance boss is provided on the inner surface, and the resistance boss is nested in the mounting groove; after the hydraulic oil enters the annular groove, it squeezes the hard plastic sleeve, so that the resistance boss hugs the support column and limits the movement of the support column; in addition, the oil inlet side of the second end cover and the oil outlet side of the plunger rod are sealed by a sealing joint, and the non-oil inlet side of the second end cover and the oil inlet side of the mounting body are connected by bolts, and a second return spring mounting hole is provided in the second end cover and the mounting body, and the second return spring is limited in the mounting hole, and the second return spring is used for the extension length of each support column; the third end cover is connected to the non-oil inlet side of the mounting body by bolts, and limits the position of the deformable sleeve; The vibration sensor is installed on the head of the main supporting column of the auxiliary supporting device to monitor the vibration signal at the supporting point of the auxiliary supporting device; the supporting force sensors are installed on the heads of the other auxiliary supporting columns to monitor the value of the supporting force at the supporting point of the auxiliary supporting device; the displacement sensor is installed inside the lifting cylinder to record the axial position of the auxiliary supporting device; the hydraulic sensor is installed on the lifting platform to monitor the fluid pressure of the oil circuit of the local combined multi-point flexible supporting device.

2. According to claim 1, a partially combined multi-point flexible support device for a variable curvature annular thin-walled part, characterized in that: Here’s how it works: First, according to the cutting position of the tool, the lifting cylinder is controlled to move the auxiliary support device to the layer section of the processed part; after the axial position of the auxiliary support device is fixed, the plunger rod is at the initial value. Driven by pressure, all the support columns are pushed to move synchronously toward the supported surface until the support columns are in full contact with the supported surface of the annular thin-walled part. The extension length of each support column is controlled by compressing the second return spring, so that the top of the support column forms a supporting curved surface with the same curvature as the supported surface. At this time, under the action of fluid pressure, each support column is clamped to limit its movement in the cylinder body; then the variables that are difficult to control directly, such as support stiffness and damping, are converted into adjustable variables that are easy to accurately control, such as hydraulic pressure, and the fluid pressure is continued to be increased. , read the values ​​of each support force sensor and hydraulic sensor, and when the support force target value is reached Stop fluid pressure control , release the workpiece deformation; During the machining process, the information of each vibration sensor is read, and the dynamic characteristic parameters of the machining system are obtained by online analysis of the vibration signal. The fluid pressure is adjusted online according to the dynamic model to enhance the output stiffness and damping characteristics of the machining system and suppress the flutter of the annular thin-walled parts.

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