Anti-fatigue strengthening special machine

Abstract

The invention discloses an anti-fatigue strengthening special machine, relates to the technical field of fatigue strengthening, and aims to solve the problems of inconstant strengthening pressure, insufficient workpiece deformation inhibition and poor strengthening uniformity caused by incapability of tracking a normal direction in anti-fatigue strengthening of a complex contour sample. The ultrasonic rolling strengthening device comprises an ultrasonic rolling strengthening executing mechanism and an auxiliary supporting mechanism. The ultrasonic rolling strengthening executing mechanism comprises a first air cylinder, a pressure sensor used for detecting and feeding back axial acting force in real time is installed at the end of a piston rod of the first air cylinder, and the pressure sensor is fixedly connected with an ultrasonic rolling strengthening executor and used for receiving propulsive force provided by the first air cylinder and force signals fed back by the pressure sensor. Ultrasonic frequency electric vibration is converted into mechanical vibration, a rolling ball is installed at the output end of the ultrasonic rolling strengthening actuator, and the rolling ball is in strengthening contact with the surface layer of the workpiece under the combined action of constant normal pressure and ultrasonic vibration; the auxiliary supporting mechanism comprises a second air cylinder, and a rolling body is installed at the end of a piston rod.

Description

Technical Field

[0001] This invention relates to the technical field of fatigue strengthening, specifically a special machine for fatigue strengthening. Background Technology

[0002] In the manufacturing and performance testing of critical components such as aero-engine blades, aircraft landing gear, automobile connecting rods and crankshafts, railway locomotive axles and wheels, and steam turbine blades, fatigue performance is a core indicator for measuring their reliability and service life. To improve the fatigue resistance of materials, standard specimens (such as notched specimens) are usually subjected to fatigue strengthening treatment to obtain key data such as the material's S / N curve, fatigue limit, and crack propagation rate. Existing fatigue strengthening technologies mainly include shot peening, rolling strengthening, internal hole extrusion strengthening, laser shock peening, and ultrasonic shock treatment. Because laser shock peening is not only complex and expensive, but also may cause slight melting or peeling of the surface layer, requiring further processing, mechanical strengthening methods such as shot peening and rolling strengthening are currently commonly used.

[0003] However, the residual compressive stress layer of existing shot peening is relatively shallow, and its effect on deep notched components is limited. Therefore, the existing fatigue strengthening mainly adopts rolling strengthening equipment. However, conventional rolling strengthening lacks real-time force feedback, has low pressure control accuracy, and is prone to over- or under-pressure. Heat treatment can easily induce cracks at the notch.

[0004] It is particularly noteworthy that when strengthening notched specimens with complex geometric features (such as being thin in the middle, thick at both ends, and having transition slopes), existing rolling strengthening equipment generally suffers from two major technical bottlenecks: First, it cannot maintain a stable normal pressure when the specimen contour changes, resulting in uneven distribution of the strengthening layer depth and residual stress; second, during rolling with force applied from one side, the specimen is prone to elastic deformation due to radial force, and the amount of deformation is difficult to control, which seriously affects the uniformity of strengthening; in addition, for the sloped or curved areas of the specimen, if the actuator cannot adjust its posture in real time to keep the rolling tool aligned with the normal of the curved surface, it will lead to force decomposition, a decrease in effective strengthening force, and even the formation of weak strengthening zones in the transition area.

[0005] Therefore, there is an urgent need in this field for a high-precision fatigue strengthening machine that can achieve constant pressure control, has opposing auxiliary support function, can adapt to complex profile specimens, and ensures uniform and consistent strengthening throughout the entire process. Summary of the Invention

[0006] To solve the above problems, namely the problems mentioned in the background art, the present invention proposes a fatigue strengthening machine, including a slide base, an ultrasonic rolling strengthening actuator, an auxiliary support mechanism, and a machine tool clamping mechanism for clamping workpieces; The ultrasonic rolling strengthening actuator and the auxiliary support mechanism are both mounted on the slide base and located on both sides of the workpiece to be strengthened; The ultrasonic rolling strengthening actuator and the auxiliary support mechanism can move toward or away from each other to abut or detach from the outer wall of the workpiece.

[0007] A further embodiment of the present invention is that the auxiliary support mechanism includes a second curved plate, a second cylinder is fixedly mounted on the second curved plate, a rolling element bracket is mounted on the piston rod end of the second cylinder, and a rolling element is rotatably mounted on the end of the rolling element bracket via a bearing.

[0008] A further provision of the present invention includes: a turntable is provided on one side of the top end face of the slide base; a fixed base of the turntable is mounted on the slide base; the bottom of the slide base slides in cooperation with a first guide rail mounted on a large slide; and the bottom of the large slide slides in cooperation with a second guide rail fixedly mounted on a machine tool.

[0009] A further configuration of the present invention is as follows: a support plate is fixedly installed above the large slide plate, a third guide rail is fixedly installed on the upper surface of the support plate, and a third slider that slides with the third guide rail is installed at the bottom of the second curved plate of the auxiliary support mechanism. A fixing plate is fixedly installed on the side of the second bending plate near the spindle box. An adjustable rod is threadedly connected to the fixing plate. One end of the adjustable rod is connected to the fixing plate through a lock nut, and the other end of the adjustable rod is set as a support end for fixed connection with the spindle box wall.

[0010] A further feature of the present invention is that the auxiliary support mechanism further includes a guide rod, one end of which is fixedly connected to the rolling element bracket, and the other end of which passes through a guide hole provided on the second curved plate. The axis of the guide rod is parallel to the direction of movement of the second cylinder piston rod.

[0011] A further configuration of the present invention is as follows: the ultrasonic rolling strengthening actuator includes a first curved plate, on which a first cylinder is fixedly mounted. A pressure sensor for real-time detection and feedback of axial force is mounted at the piston rod end of the first cylinder. The pressure sensor is fixedly connected to an ultrasonic rolling strengthening actuator. The ultrasonic rolling strengthening actuator receives the propulsion force provided by the first cylinder and the force signal fed back by the pressure sensor, and converts ultrasonic frequency electrical vibration into mechanical vibration. A rolling ball is mounted at the output end of the ultrasonic rolling strengthening actuator. Under the combined action of constant normal pressure and ultrasonic vibration, the rolling ball strengthens the contact with the surface layer of the workpiece.

[0012] A further configuration of the present invention is as follows: the ultrasonic rolling strengthening actuator is fixedly mounted on a turntable via its first bent plate; the turntable includes a fixed base and a turntable driven by a servo motor; the turntable is rotatably supported on the fixed base via a bearing assembly, and the turntable is driven by the servo motor to perform precise indexing and rotational movements; the lower end face of the first bent plate is fixedly connected to the upper surface of the turntable.

[0013] A further feature of the present invention is that the lower end of the housing of the ultrasonic rolling strengthening actuator slides in conjunction with the fourth guide rail on the first bending plate.

[0014] A further embodiment of the present invention includes a turning mechanism disposed between the turntable and the auxiliary support mechanism. The turning mechanism includes a turning bracket, a tool holder, and a cutting tool. The turning bracket is fixedly mounted on a slide plate base, on which a vertically arranged fifth guide rail is disposed. A fifth slider that slides with the guide rail is fixedly disposed on the tool holder and is driven to move up and down along the fifth guide rail by a third cylinder. The cutting tool is clamped on the tool holder.

[0015] A further configuration of the present invention is as follows: the machine tool clamping mechanism includes a spindle and a tailstock center, the workpiece is clamped between the spindle and the tailstock center, and is driven to rotate by the spindle.

[0016] The beneficial technical effects of this invention are as follows: 1. By setting up a closed-loop feedback system composed of a pressure sensor and a first cylinder, the normal pressure acting on the workpiece surface can be detected and dynamically adjusted in real time, ensuring that the pressure of the rolling ball on the workpiece remains constant throughout the strengthening process. This effectively overcomes the problems of overpressure damage or insufficient strengthening due to pressure fluctuations in the prior art, making the strengthening layer depth and residual stress distribution more uniform and controllable.

[0017] 2. By setting an auxiliary support mechanism on the radially opposite side of the reinforced part of the workpiece, its rolling elements can provide support force opposite to the direction of the ultrasonic rolling actuator during the reinforcement process. This structure significantly counteracts the elastic deformation of the workpiece caused by the radial processing force. Especially for slender shafts or thin-walled specimens, it can ensure the stability of the workpiece posture during the reinforcement process and avoid uneven reinforcement layer caused by deformation.

[0018] 3. By mounting the ultrasonic rolling strengthening actuator on a servo motor-driven turntable, the processing orientation of the rolling ball can be dynamically adjusted. When processing workpieces with inclined or curved surfaces, the turntable can drive the actuator to deflect in real time, ensuring that the rolling ball always maintains normal contact with the local surface of the workpiece. This mechanism fundamentally solves the problem of reduced effective strengthening force caused by non-directional contact in inclined areas with fixed actuators, ensuring that all areas of the workpiece contour, especially geometric transition areas, can obtain a uniform strengthening effect.

[0019] 4. By integrating the turning mechanism and the ultrasonic rolling strengthening mechanism on the same dedicated machine, and using program control to coordinate the actions of each execution unit, the workpiece can complete both turning and fatigue strengthening processes in a single clamping operation. This not only reduces positioning errors caused by multiple clamping operations and improves processing efficiency, but also avoids surface damage that may be caused by intermediate handling, making it particularly suitable for the rapid and high-precision preparation and strengthening of standard fatigue specimens. Attached Figure Description

[0020] Figure 1 A three-dimensional structural schematic diagram of the present invention is shown.

[0021] Figure 2 A top view of the invention is shown.

[0022] Figure 3 A front view of the present invention is shown.

[0023] Reference numerals: 1. Workpiece; 2. Ultrasonic rolling strengthening actuator; 201. First bending plate; 202. First cylinder; 203. Pressure sensor; 204. Ultrasonic rolling strengthening actuator; 205. Rolling ball; 3. Auxiliary support mechanism; 301. Second bending plate; 302. Second cylinder; 303. Rolling element bracket; 304. Rolling element; 305. Guide rod; 4. Turntable; 401. Fixed base; 402. Servo motor; 403. Turntable; 5. Slide plate base; 6. First guide rail; 7. Large slide; 8. Support plate; 9. Third guide rail; 10. Third slider; 11. Fixed plate; 12. Adjustable rod; 13. Turning bracket; 14. Tool holder; 15. Turning tool; 16. Third cylinder. Detailed Implementation

[0024] The following is a reference to the appendix. Figure 1-3 The preferred embodiments of the present invention will be described below. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0025] This invention proposes a fatigue strengthening machine, including a slide base 5, an ultrasonic rolling strengthening actuator 2, an auxiliary support mechanism 3, and a machine tool clamping mechanism for clamping the workpiece 1; The ultrasonic rolling strengthening actuator 2 and the auxiliary support mechanism 3 are both mounted on the slide base 5 and located on both sides of the workpiece 1 to be strengthened. The ultrasonic rolling strengthening actuator 2 and the auxiliary support mechanism 3 can move toward or away from each other to abut or detach from the outer wall of the workpiece 1.

[0026] The machine tool clamping mechanism includes a spindle 17 and a tailstock center 18. The workpiece 1 is clamped between the spindle 17 and the tailstock center 18 and is rotated by the spindle 17.

[0027] The ultrasonic rolling strengthening actuator 2 includes a first curved plate 201, on which a first cylinder 202 is fixedly mounted. A pressure sensor 203 for real-time detection and feedback of axial force is installed at the piston rod end of the first cylinder 202. The pressure sensor 203 is fixedly connected to an ultrasonic rolling strengthening actuator 204. The ultrasonic rolling strengthening actuator 204 receives the thrust provided by the first cylinder 202 and the force signal fed back by the pressure sensor 203, and converts ultrasonic frequency electrical vibration into mechanical vibration. A rolling ball 205 is installed at the output end of the ultrasonic rolling strengthening actuator 204. Under the combined action of constant normal pressure and ultrasonic vibration, the rolling ball 205 strengthens the surface layer of the contact workpiece 1. A fourth guide rail is provided on the upper surface of the first curved plate 201, and a fourth slider that cooperates with the fourth guide rail is provided at the lower end of the housing of the ultrasonic rolling strengthening actuator 204. Guided by the guide rail and slider, the ultrasonic rolling strengthening actuator 204 moves smoothly along the preset direction under the drive of the first cylinder 202, avoiding deflection or vibration during the advancement process, and ensuring that the rolling ball 205 always maintains normal contact with the surface of the workpiece 1, thereby improving the stability and uniformity of the strengthening process.

[0028] The auxiliary support mechanism 3 includes a second curved plate 301, on which a second cylinder 302 is fixedly mounted. A rolling element bracket 303 is mounted on the piston rod end of the second cylinder 302, and a rolling element 304 is rotatably mounted on the end of the rolling element bracket 303 via a bearing. The rolling element 304 is used to counteract the radial force generated by the rolling process, suppress workpiece deformation, and ensure the stability of the strengthening pressure and the uniformity of the strengthening layer depth. The auxiliary support mechanism 3 also includes a guide rod 305. One end of the guide rod 305 is fixedly connected to the rolling element bracket 303, and the other end passes through a guide hole provided on the second curved plate 301. The axis of the guide rod 305 is parallel to the movement direction of the piston rod of the second cylinder 302. When the second cylinder 302 drives the rolling element bracket 303 and the rolling element 304 to extend or retract, the guide rod 305 slides in the guide hole, thereby constraining the rolling element bracket 303 to move only in a straight line, preventing it from rotating around the piston rod axis, and ensuring the accuracy of the contact direction between the rolling element 304 and the workpiece 1.

[0029] The ultrasonic rolling strengthening actuator 2 is fixedly mounted on the turntable 4 via its first curved plate 201. The turntable 4 includes a fixed base 401 and a turntable 403 driven by a servo motor 402. The turntable 403 is rotatably supported on the fixed base 401 via a bearing assembly. The turntable 403 is driven by the servo motor 402 to perform precise indexing and rotational movements. The lower end face of the first curved plate 201 is fixedly connected to the upper surface of the turntable 403. The servo motor 402 drives the turntable 403 and the ultrasonic rolling strengthening actuator 2 fixed thereon to rotate together around the axis of the turntable, thereby adjusting the processing orientation of the rolling ball 205 so that it is always aligned with the normal direction of the curved surface of the strengthened part of the workpiece 1. For workpieces similar to notched samples, that is, workpieces that are thin in the middle and thick at both ends and have bevels, there is an angle between the beveled part and the main shaft axis. If the actuator direction is fixed, illegal contact will inevitably occur when processing to the bevel. Therefore, the present invention provides a turntable driven by a servo motor. As the machining point moves from the cylindrical surface to the inclined surface, the servo motor precisely controls the turntable to drive the actuator to rotate synchronously by the corresponding angle, compensating in real time for directional deviations caused by contour changes. This ensures that the rolled ball remains aligned with the normal direction of the local curved surface at any position. This mechanism fundamentally guarantees the accuracy and consistency of the strengthening force, eliminating weak strengthening zones caused by geometric transitions.

[0030] The fixed base 401 of the rotary table 4 is set on the slide plate base 5. The slide plate base 5 slides with the first guide rail 6 installed on the large slide plate 7 through the dovetail groove provided at its bottom to form an X-axis feed system. The large slide plate 7 slides with the second guide rail (not shown in the figure) fixedly installed on the machine tool bed through the flat V-rail sliding pair provided at its bottom to form a Z-axis feed system.

[0031] With the above structure, the large slide 7 can slide along the Z direction, and drive the skateboard base 5 and the turntable 4 on it to move together in the Z direction; the skateboard base 5 can slide relative to the large slide 7 along the X direction, thereby driving the turntable 4 to move in the X direction.

[0032] A support plate 8 is fixedly installed above the large slide plate 7. A third guide rail 9 is fixedly installed on the upper surface of the support plate 8. A third slider 10 that slides with the third guide rail 9 is installed at the bottom of the second curved plate 301 of the auxiliary support mechanism 3. A fixed plate 11 is fixedly installed on the side of the second bending plate 301 near the spindle box. An adjustable rod 12 is threaded onto the fixed plate 11. One end of the adjustable rod 12 is connected to the fixed plate 11 via a lock nut, and the other end of the adjustable rod 12 is configured as a support end for fixed connection with the spindle box wall. When adjustment is required, the lock nut is loosened, and the adjustable rod 12 is rotated to change its effective length, thereby pushing the second bending plate 301 to move. After adjustment, the lock nut is tightened so that the support end of the adjustable rod 12 presses tightly against the spindle box, forming an axially fixed support rod that remains axially fixed relative to the spindle box during processing, forming a stable support reference.

[0033] This application also includes a turning mechanism disposed between the turntable 4 and the auxiliary support mechanism 3. The turning mechanism includes a turning bracket 13, a tool holder 14, and a cutting tool 15. The turning bracket 13 is fixedly mounted on the slide base 5, and a vertically arranged fifth guide rail is provided on it. A fifth slider that slides with the guide rail is fixedly mounted on the tool holder 14 and is driven to rise and fall along the fifth guide rail by a third cylinder 16. The cutting tool 15 is clamped on the tool holder 14. When the third cylinder 16 drives the tool holder 14 to rise to the working position, the cutting tool 15 can perform turning machining on the workpiece 1 clamped between the main bearing and the center. When the tool holder 104 is lowered to the non-working position, space is made for ultrasonic roll forming.

[0034] Working principle: The present invention discloses a fatigue strengthening machine, the core working principle of which is to achieve high-quality and consistent fatigue-resistant ultrasonic rolling strengthening of workpieces with complex geometric features, especially notched specimens with a thin middle, thick ends and transition slopes, by setting an auxiliary support mechanism on the radial opposite side of the strengthened part of the workpiece, an adaptive surface normal orientation adjustment system, and an integrated turning and strengthening process.

[0035] Workpiece 1 is a typical notched specimen used for fatigue resistance testing. It is characterized by a narrow test section in the middle and thicker clamping sections at both ends, connected by a transitional bevel. During machining, workpiece 1 is clamped between the machine tool spindle 17 (which rotates the workpiece) and the tailstock center 18, with its axis serving as the rotation reference. This clamping method ensures that the workpiece rotates at a uniform speed during machining, laying the foundation for uniform circumferential strengthening.

[0036] Before the strengthening process begins, the large slide 7 moves along the Z-axis via the second guide rail on the bed, driving the entire strengthening unit to feed along the workpiece axis. The slide base 5 moves along the X-axis via the first guide rail 6 to adjust the radial distance between the rolling balls 205 and the rolling elements 304 to accommodate workpiece segments of different diameters. The combined motion of these two components enables the strengthening head to precisely track the complex contour of the workpiece.

[0037] To ensure that the auxiliary support mechanism 3 has an absolute rigid reference during processing, its second curved plate 301 is tightly pressed against the wall of the spindle box by an adjustable rod 12. After the position is adjusted, it is locked, making the adjustable rod 12 an axially fixed support rod, preventing the entire auxiliary support mechanism from moving backward or vibrating under reaction force.

[0038] The first cylinder 202 of the ultrasonic rolling strengthening actuator 2 applies a constant thrust, which is monitored and fed back in real time by the pressure sensor 203. This force pushes the entire ultrasonic rolling strengthening actuator 204 and its end rolling ball 205 closer to the surface of the workpiece 1. Almost simultaneously on the support side, the second cylinder 302 of the auxiliary support mechanism 3 drives the rolling element bracket 303 and the rolling element 304 to extend to the other side of the workpiece 1, so that it supports the workpiece 1 from the radial opposite side. The feedback signal from the pressure sensor 203 is used to precisely control the output force of the first cylinder 202, stabilizing it at a preset value.

[0039] This auxiliary support mechanism effectively counteracts the huge radial force generated by the rolling process, preventing bending deformation or vibration of slender or thin-walled workpieces, especially the narrow diameter section of notched specimens; it ensures that the normal pressure acting on the surface of the workpiece is constant and precise, which is the key to obtaining a uniform and consistent reinforcement layer depth and surface quality; under constant pressure, as the workpiece rotates, the rolling ball 205 can form a uniform plastic deformation layer and residual compressive stress layer in the circumferential direction of the workpiece.

[0040] Under constant normal pressure, the ultrasonic rolling strengthening actuator 204 converts the externally input ultrasonic electrical oscillation signal into mechanical vibration and transmits it to the rolling ball 205. The rolling ball 205 then rolls the workpiece surface under the combined action of "static pressure rolling" and "high-frequency, small-amplitude impact ultrasonic vibration." This combined effect can more effectively break up grains, introduce deeper residual compressive stress, and reduce friction during the rolling process, thereby achieving superior surface integrity and fatigue resistance.

[0041] Key innovations addressing the inclined transition: For workpieces with notched transition surfaces, after the cylindrical section is reinforced, the machining point needs to move along the Z-axis to the inclined area. At this point, the local normal direction of the workpiece at that point is no longer perpendicular to the spindle axis, but rather forms an angle. If the actuator direction is fixed, the rolling balls will be unable to maintain normal contact, leading to inaccurate reinforcement pressure and the formation of a weak reinforcement zone. To solve this problem, this invention achieves real-time adjustment of the actuator orientation through a turntable 4. Based on the workpiece's CAD model or a preset program, the control system instructs the servo motor 402 to drive the turntable 403 to precisely rotate by a corresponding angle when the machining point moves to the inclined surface. This rotational motion causes the entire ultrasonic rolling reinforcement actuator 2, fixed on the turntable 403, to deflect synchronously, ensuring that the axis of the rolling ball 205 is aligned in real-time with the local curved surface normal of the current machining point on the workpiece. Simultaneously, the rolling element 304 of the auxiliary support mechanism 3 serves as a static support point, providing basic radial constraints for the main reinforcement process.

[0042] This equipment integrates a turning mechanism, enabling the completion of all processes from roughing to final strengthening on a single machine. When turning is required, the third cylinder 16 raises the tool holder 14 and the cutting tool 15 to the working position to shape the workpiece. After turning, the third cylinder 16 drives the tool holder 14 to descend to the non-working position, making room for ultrasonic roll forming. This integrated design reduces the number of workpiece clamping operations, improves processing efficiency, avoids secondary clamping errors, and ensures the consistency of the surface condition before strengthening.

[0043] In summary, through the coordinated operation of the aforementioned mechanisms, this invention is particularly suitable for high-precision, high-quality ultrasonic rolling fatigue strengthening of notched specimens with complex geometries, effectively improving the fatigue life and reliability of the workpiece.

[0044] Although the invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0045] In the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0048] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A fatigue-strengthening machine, characterized in that: It includes a slide base (5), an ultrasonic rolling strengthening actuator (2), an auxiliary support mechanism (3), and a machine tool clamping mechanism for clamping the workpiece (1); The ultrasonic rolling strengthening actuator (2) and the auxiliary support mechanism (3) are both mounted on the slide base (5) and located on both sides of the workpiece (1) to be strengthened; The ultrasonic rolling strengthening actuator (2) and the auxiliary support mechanism (3) can move toward or away from each other to abut or detach from the outer wall of the workpiece (1).

2. The fatigue-strengthening special machine according to claim 1, characterized in that: The auxiliary support mechanism (3) includes a second curved plate (301), on which a second cylinder (302) is fixedly installed. A rolling element bracket (303) is installed at the end of the piston rod of the second cylinder (302), and a rolling element (304) is installed at the end of the rolling element bracket (303).

3. The fatigue-strengthening special machine according to claim 1, characterized in that: A turntable (4) is provided on one side of the top end face of the slide base (5). The fixed base (401) of the turntable (4) is installed on the slide base (5). The bottom of the slide base (5) is slidably engaged with the first guide rail (6) installed on the large slide (7). The bottom of the large slide (7) is slidably engaged with the second guide rail fixedly installed on the machine tool.

4. The fatigue-strengthening special machine according to claim 3, characterized in that: A support plate (8) is fixedly installed above the large slide plate (7), and a third guide rail (9) is fixedly installed on the upper surface of the support plate (8). A third slider (10) that slides with the third guide rail (9) is installed at the bottom of the second curved plate (301) of the auxiliary support mechanism (3). A fixing plate (11) is fixedly installed on the side of the second bending plate (301) near the spindle box. An adjustable rod (12) is threadedly connected to the fixing plate (11). One end of the adjustable rod (12) is connected to the fixing plate (11) through a locking nut. The other end of the adjustable rod (12) is set as a support end for fixed connection with the spindle box wall.

5. The fatigue-strengthening special machine according to claim 2, characterized in that: The auxiliary support mechanism (3) also includes a guide rod (305), one end of which is fixedly connected to the rolling element bracket (303), and the other end of which passes through a guide hole provided on the second bending plate (301). The axis of the guide rod (305) is parallel to the movement direction of the piston rod of the second cylinder (302).

6. The fatigue-strengthening special machine according to claim 1, characterized in that: The ultrasonic rolling strengthening actuator (2) includes a first curved plate (201), on which a first cylinder (202) is fixedly installed. A pressure sensor (203) for real-time detection and feedback of axial force is installed at the piston rod end of the first cylinder (202). The pressure sensor (203) is fixedly connected to an ultrasonic rolling strengthening actuator (204). The ultrasonic rolling strengthening actuator (204) receives the thrust provided by the first cylinder (202) and the force signal fed back by the pressure sensor (203), and converts ultrasonic frequency electrical vibration into mechanical vibration. A rolling ball (205) is installed at the output end of the ultrasonic rolling strengthening actuator (204). The rolling ball (205) strengthens the contact with the surface of the workpiece (1) under the combined action of constant normal pressure and ultrasonic vibration.

7. The fatigue-strengthening special machine according to claim 1, characterized in that: The ultrasonic rolling strengthening actuator (2) is fixedly mounted on the turntable (4) via its first bending plate (201); the turntable (4) includes a fixed base (401) and a turntable (403) driven by a servo motor (402); the turntable (403) is rotatably supported on the fixed base (401) via a bearing assembly, and the turntable (403) is driven by the servo motor (402) to perform indexing and rotational movements; the lower end face of the first bending plate (201) is fixedly connected to the upper surface of the turntable (403).

8. The fatigue-strengthening special machine according to claim 1, characterized in that: The lower end of the housing of the ultrasonic rolling strengthening actuator (204) is slidably engaged with the fourth guide rail on the first bending plate (201).

9. The fatigue-strengthening special machine according to claim 1, characterized in that: It also includes a turning mechanism disposed between the turntable (4) and the auxiliary support mechanism (3), the turning mechanism including a turning bracket (13), a tool holder (14) and a cutting tool (15); the turning bracket (13) is fixedly installed on the slide plate base (5); the cutting tool holder (14) is slidably engaged with the fifth guide rail on the turning bracket (13), the cutting tool holder (14) is driven to rise and fall along the fifth guide rail by the third cylinder (16); the cutting tool (15) is clamped on the cutting tool holder (14).

10. A fatigue-strengthening special machine according to claim 1, characterized in that: The machine tool clamping mechanism includes a spindle (17) and a tailstock center (18). The workpiece (1) is clamped between the spindle (17) and the tailstock center (18) and is driven to rotate by the spindle (17).

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