3D printing metal material fatigue life prolonging device based on ultrasonic-assisted rolling and working method of 3D printing metal material fatigue life prolonging device

Abstract

The invention provides a 3D printing metal material fatigue life prolonging device based on ultrasonic-assisted rolling and a working method of the 3D printing metal material fatigue life prolonging device. The 3D printing metal material fatigue life prolonging device comprises an ultrasonic rolling device, a control system, a cooling system, a feedback and monitoring system, a power system and a safety protection system. The ultrasonic rolling device comprises an ultrasonic rolling mechanism, a horizontal moving mechanism, a sliding rod mechanism, an ejector pin mechanism and a rotary clamping mechanism which are arranged on a rack 18. The auxiliary system is perfect, supports various workpiece forms (plate-shaped and rod-shaped) and is adaptive to 3D printing metal pieces in different shapes, the safety performance of the device is effectively improved, through the synergistic effect of ultrasonic vibration and rolling, internal pores of the 3D printing metal materials are effectively compacted, the surface quality is improved, and therefore the fatigue life of the materials is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of surface treatment of metal materials, and particularly relates to a device for enhancing the fatigue life of 3D printed metal materials based on ultrasonic assisted rolling and its working method. Background Art

[0002] 3D printing technology, also known as additive manufacturing technology, has been widely used in the fields of aerospace, medical devices, automotive manufacturing, etc. because it can rapidly form complex structural parts. However, compared with traditional manufacturing processes, 3D printed metal materials generally have the problem of insufficient fatigue performance, which severely restricts their application in key load-bearing structural parts. In traditional metal 3D printing processes, such as fused deposition modeling (FDM), selective laser melting (SLM), etc., due to the layer-by-layer stacking manufacturing method, it is inevitable to introduce defects such as pores and lack of fusion inside the material, and obvious layer lines and roughness are formed on the surface. These defects and surface topography features will become stress concentration sources, initiate cracks and expand under cyclic loading, and ultimately lead to fatigue failure of the material.

[0003] Currently, to improve the fatigue performance of 3D printed metal parts, the fatigue performance can be improved by adjusting parameters such as laser power, scanning speed, layer thickness, etc., to improve the density and surface quality of the printed parts. However, this method is often difficult to fundamentally eliminate the internal defects generated during the printing process, and the optimization process is complex and costly. Post-treatment such as heat treatment, shot peening, and rolling strengthening can also be performed on the printed parts to improve their microstructure, increase surface hardness, and introduce residual compressive stress, thereby improving their fatigue performance. Among them, rolling strengthening, as a simple and effective surface strengthening technology, can significantly improve the fatigue life of metal materials. However, the strengthening effect of traditional rolling strengthening methods on 3D printed metal parts is limited. The main reason is that 3D printed metal parts usually have anisotropy and internal defects such as pores and lack of fusion, resulting in poor plastic deformation ability and it is difficult to obtain an ideal strengthening effect through traditional rolling methods. Moreover, the surface roughness of 3D printed metal parts is relatively large, and traditional rolling methods are likely to cause surface damage, instead reducing their fatigue performance.

[0004] In recent years, ultrasonic assisted machining technology has received extensive attention due to its unique advantages. When ultrasonic waves propagate in materials, they will generate high-frequency vibrations and acoustic streaming effects, which can effectively reduce the deformation resistance of materials, promote material flow and densification. Applying ultrasonic assisted machining technology to the 3D printing field is expected to provide new ideas for solving the problem of insufficient fatigue performance of 3D printed metal materials.

[0005] Ultrasonic assisted rolling technology is a new surface strengthening technology that combines ultrasonic vibration with rolling process. This technology uses the high-frequency vibration and acoustic streaming effect of ultrasound to significantly reduce rolling force, improve rolling efficiency, and introduce greater residual compressive stress on the surface and near-surface layer of the material, thereby more effectively inhibiting the initiation and expansion of fatigue cracks. In addition, ultrasonic assisted rolling can also improve the microscopic morphology of the material surface, reduce surface roughness, and further improve the fatigue performance of the material.

[0006] Traditional ultrasonic rolling technology for enhancing 3D printing surface properties can only process specific workpieces, has poor applicability, and its safety performance needs to be improved. In view of this, the present invention proposes a 3D printing metal material fatigue life enhancement device based on ultrasonic assisted rolling and a working method thereof. Summary of the invention

[0007] The purpose of the present invention is to propose a 3D printed metal material fatigue life enhancement device based on ultrasonic assisted rolling and a working method thereof. The auxiliary system is perfect, supports a variety of workpiece shapes (plate-shaped and rod-shaped), is adapted to 3D printed metal parts of different shapes, and effectively improves the safety performance of the device; through the synergistic effect of ultrasonic vibration and rolling, the internal pores of the 3D printed metal material are effectively compacted, the surface quality is improved, and thus the fatigue life of the material is increased.

[0008] To achieve the above object, the technical solution of the present invention is as follows:

[0009] On the one hand, the present invention proposes a 3D printed metal material fatigue life enhancement device based on ultrasonic assisted rolling, including an ultrasonic rolling device, a control system, a cooling system, a feedback and monitoring system, a power supply system and a safety protection system; the ultrasonic rolling device includes an ultrasonic rolling mechanism, a horizontal moving mechanism, a sliding rod mechanism, a pin mechanism and a rotary clamping mechanism arranged on a frame 18.

[0010] Preferably, the horizontal moving mechanism includes a driving motor, side guide rails, side guide rail sliders, two groups of horizontal moving platforms, a spiral shaft, a chuck, and a plate clamp; both ends of the spiral shaft pass through a fixed frame and are horizontally arranged on the frame, and one end of the spiral shaft is limited by a chuck, and the other end is connected to the driving motor; side guide rails and side guide rail sliders slidably connected to the side guide rails are arranged on both sides of the spiral shaft; threaded holes matching the threaded shaft are opened on the horizontal moving platform, and the horizontal moving platform is connected to the side guide rail sliders on both sides of the spiral shaft, and the horizontal movement of the horizontal moving platform is realized by the rotation of the spiral shaft under the drive of the driving motor; plate clamps and ejector mechanisms are respectively arranged on the two groups of horizontal moving platforms, and the plate clamps are used to clamp and fix 3D printed metal plates.

[0011] Preferably, the thimble mechanism includes a thimble and a manual hydraulic pump. The fixed end of the manual hydraulic pump is fixed on the horizontal moving platform, and the movable end of the manual hydraulic pump is provided with a thimble to control the horizontal movement of the thimble along the axial direction of the screw shaft through the hand rocker of the manual hydraulic pump.

[0012] Preferably, the slide bar mechanism includes a linear slide table, an electric lifting slide table, and an ultrasonic rolling mechanism fixture; the linear slide table includes a horizontal guide rail arranged on one side of the horizontal moving mechanism, and a slider that can slide left and right on the horizontal guide rail through a control system; the electric lifting slide table includes a vertical guide rail arranged on the slider, and an ultrasonic rolling mechanism fixture that can slide up and down on the vertical guide rail through a control system; the ultrasonic rolling mechanism fixture is provided with a telescopic member that moves in a direction perpendicular to the horizontal guide rail to clamp the ultrasonic rolling device.

[0013] Preferably, the telescopic member adopts an electric cylinder or an electric hydraulic cylinder, and the movable end of the telescopic member clamps the ultrasonic rolling device.

[0014] Preferably, the ultrasonic rolling mechanism includes a transducer, a horn, a rolling body holder, and a rolling body; the transducer includes a coil wound around its exterior, and the coil is connected to an ultrasonic transmitter. The other end of the ultrasonic transmitter is connected to a power supply system and a control system; the horn is connected to the transducer; the rolling body is installed at the end of the horn through the rolling body holder.

[0015] Preferably, the rotary clamping mechanism is arranged at one end in the moving direction of the horizontal moving mechanism; the rotary clamping mechanism includes a motor, a belt pulley, a main shaft, a taper sleeve, a box body, a partition board, a rib plate, a flange, and a three-jaw chuck; the box body is fixed on a support seat, and the support seat is fixed on the frame; partition boards are installed at both ends of the box body, and taper sleeves are installed on the outer sides of the partition boards. Rib plates are provided on the box body; the belt pulley is located on one side of the box body, and the belt pulley is connected to the motor through a transmission belt and connected to the main shaft through a key; the other end of the main shaft passes through the box body, the partition boards and the taper sleeves on both sides of the box body and is connected to the three-jaw chuck through a flange, and the three-jaw chuck is connected to the flange through a key; the three-jaw chuck is used to fix the 3D printing metal rod.

[0016] Preferably, the cooling system includes a cooling water pump, a cooling water pipe, and a radiator for cooling the device; the feedback and monitoring system includes a surface roughness meter, an infrared thermal imager, and sensors to monitor the processing quality in real time and provide feedback; the power supply system includes a power adapter, a cable, and a voltage regulator to provide electrical energy for the equipment; the safety protection system includes an emergency stop button, a safety door, and an alarm device to ensure operation safety.

[0017] Preferably, the control system is connected to a cooling system, a feedback and monitoring system, a power supply system, and a safety protection system; it is used to control the movement trajectories of the workbench and the rolling body, and adjust the ultrasonic frequency, power, and rolling parameters.

[0018] On the other hand, the present invention proposes a method for using any of the above-mentioned 3D printing metal material fatigue life enhancement devices based on ultrasonic-assisted rolling, which specifically includes the following steps:

[0019] Step 1: Turn on the power of the ultrasonic vibration device; start the control system, and set the ultrasonic vibration parameters according to the material type and process requirements, including frequency and amplitude; the device performs self-check to ensure that the ultrasonic generator, rolling head, and components of each control system are working properly.

[0020] Step 2: Fix one side of the 3D printed metal rod to be processed on a three-jaw chuck, and control the thimble to fix the other side of the 3D printed metal rod, or fix the 3D printed metal plate on the plate fixture; plan the movement path of the rolling head through the control system to ensure that all areas of the printed workpiece surface that need to be processed are covered.

[0021] Step 3: Under the control of each system, the ultrasonic rolling structure moves to a suitable position through a linear slide, an electric lifting slide, and a telescopic member, and the rolling head performs uniform rolling on the surface of the printed workpiece with a preset pressure; the rolling force, vibration frequency, and amplitude are monitored in real time through sensors to ensure process stability.

[0022] Step 4: After completing the ultrasonic vibration rolling, stop the ultrasonic vibration, and the rolling head leaves the surface of the printed workpiece; remove the printed workpiece from the fixture and perform subsequent cooling treatment; the rolling head returns to the initial position, and the device enters the standby state.

[0023] Step 5: After completing all operations, turn off the power supply system.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention provides a device for enhancing the fatigue life of 3D printed metal materials based on ultrasonic assisted rolling and its working method. The device has a simple structure and is easy to operate. It can cover a wider range of metal types (such as pure copper, titanium alloy, stainless steel, etc.), has stronger applicability, supports the processing of plate-shaped and rod-shaped workpieces, has higher adaptability, is more intelligent, can conduct real-time monitoring and feedback, and integrates a cooling system (to prevent overheating), a safety protection system (emergency stop button, alarm device) and a power supply system, improving the reliability and operation safety of the equipment. Parameters such as ultrasonic vibration frequency, amplitude, rolling force, and rolling speed can be precisely adjusted according to the material type and process requirements. The synergistic effect of ultrasonic vibration and rolling can effectively compact defects such as pores and lack of fusion inside the 3D printed metal materials, improve the microstructure of the materials, and thus significantly enhance the fatigue life of the materials, providing a more comprehensive solution for the engineering application of 3D printed metal materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of the ultrasonic assisted rolling device of the present invention;

[0027] Figure 2 is a front view of the ultrasonic assisted rolling device of the present invention;

[0028] Figure 3 is a side view of the ultrasonic assisted rolling device of the present invention;

[0029] Figure 4 is a schematic structural diagram of the ultrasonic assisted rolling device of the present invention for processing plate-shaped components;

[0030] Figure 5 is a schematic structural diagram of the ultrasonic assisted rolling device of the present invention for processing rod-shaped components;

[0031] Figure 6 is a schematic principle diagram of the ultrasonic rolling structure of the present invention.

[0032] In the figure: 1 - isolation plate; 2 - box body; 3 - rib plate; 4 - three-jaw chuck; 5 - fixture of ultrasonic rolling mechanism; 6 - ultrasonic rolling mechanism; 7 - vertical guide rail; 8 - slider base; 9 - center drill; 10 - hand crank; 11 - horizontal guide rail; 12 - driving motor; 13 - side guide rail; 14 - side guide rail slider; 15 - horizontal moving platform; 16 - screw shaft; 17 - plate fixture; 18 - frame; 19 - support seat; 20 - belt pulley; 21 - main shaft; 22 - taper sleeve; 23 - flange; 24 - transducer; 25 - horn; 26 - rolling body holder; 27 - rolling body; 28 - manual hydraulic pump; 29 - chuck; 30 - 3D printed metal plate; 31 - 3D printed metal rod; 32 - slider; 33 - coil; 34 - ultrasonic transmitter. DETAILED DESCRIPTION OF THE INVENTION

[0033] The following will specifically describe the technical solution of the present invention in conjunction with the accompanying Figure 1-6 drawings.

[0034] The present invention provides a device for enhancing the fatigue life of 3D printed metal materials based on ultrasonic assisted rolling, which includes an ultrasonic rolling device, a control system, a cooling system, a feedback and monitoring system, a power supply system and a safety protection system; the ultrasonic rolling device includes an ultrasonic rolling mechanism, a horizontal movement mechanism, a slide bar mechanism, a thimble mechanism and a rotary clamping mechanism arranged on a frame 18.

[0035] In this embodiment, the horizontal movement mechanism includes a driving motor 12, side guide rails 13, side guide rail sliders 14, two groups of horizontal movement platforms 15, a screw shaft 16, a chuck 29, and a plate fixture 17; both ends of the screw shaft 16 pass through a fixing frame and are horizontally arranged on the frame 18, and one end of the screw shaft 16 is limited by the chuck 29, and the other end is connected to the driving motor 12; side guide rails 13 and side guide rail sliders 14 slidably connected to the side guide rails 13 are arranged on both sides of the screw shaft 16; threaded holes matching the threaded shaft 16 are provided on the horizontal movement platform 15, and the horizontal movement platform 15 is connected to the side guide rail sliders 14 on both sides of the screw shaft 16, and the horizontal movement of the horizontal movement platform 15 is realized through the rotation of the screw shaft 16 driven by the driving motor 12; a plate fixture 17 and a thimble mechanism are respectively arranged on the two groups of horizontal movement platforms 15, and the plate fixture 17 is used for clamping and fixing the 3D printed metal plate 30.

[0036] The horizontal movement mechanism is fixed on the frame 18 by bolts, and the side guide rails 13 on both sides are made of cast iron.

[0037] In this embodiment, the thimble mechanism includes a thimble 9 and a manual hydraulic pump 28. The fixed end of the manual hydraulic pump 28 is fixed on the horizontal movement platform 15, and the movable end of the manual hydraulic pump 28 is provided with a thimble 9, so as to control the horizontal movement of the thimble 9 along the axial direction of the screw shaft 16 through the hand rocker 10 of the manual hydraulic pump 28, and thus adjust the thimble position according to the length of the printed workpiece through the hand rocker 10 and the manual hydraulic pump 28.

[0038] In this embodiment, the slide bar mechanism includes a linear slide table, an electric lifting slide table, and an ultrasonic rolling mechanism fixture 5; the linear slide table includes a horizontal guide rail 11 disposed on one side of the horizontal moving mechanism, and a slider 32 that can slide left and right on the horizontal guide rail 11 through a control system; the electric lifting slide table includes a vertical guide rail 7 disposed on the slider 32, and an ultrasonic rolling mechanism fixture 5 that can slide up and down on the vertical guide rail 7 through a control system; the ultrasonic rolling mechanism fixture 5 is provided with a telescopic member that moves in a direction perpendicular to the horizontal guide rail 11 to clamp the ultrasonic rolling device, and can move in three directions according to the size of the 3D printed part. Both the linear slide table and the electric lifting slide table are prior arts and will not be elaborated herein.

[0039] In this embodiment, the telescopic member adopts an electric cylinder or an electric hydraulic cylinder, and the movable end of the telescopic member clamps the ultrasonic rolling device.

[0040] Preferably, the ultrasonic rolling mechanism includes a transducer 24, a horn 25, a rolling body holder 26, and a rolling body 27; the transducer 24 includes a coil 33 wound around its exterior, and the coil 33 is connected to an ultrasonic transmitter 34, and the other end of the ultrasonic transmitter 34 is connected to a power supply system and a control system; the horn 25 is connected to the transducer 24; the rolling body 27 is installed at the end of the horn 25 through the rolling body holder 26. The ultrasonic transmitter 34 generates a high-frequency electrical signal and transmits it to the transducer 24 through the coil 33. The transducer 24 converts the electrical signal into mechanical vibration. The horn 25 is connected to the transducer 24 and is used to amplify the mechanical vibration and transmit it to the rolling body 27. The rolling body 27 is installed at the end of the horn 25 through the rolling body holder 26 and directly acts on the surface of the workpiece with the amplified vibration to produce an impact vibration effect. The entire system is connected in the order of ultrasonic transmitter 34 → transducer 24 → horn 25 → rolling body 27 to cooperate to complete the ultrasonic impact treatment process.

[0041] The ultrasonic rolling mechanism is connected to the ultrasonic transmitter 34. The ultrasonic transmitter 34 is composed of a high-frequency power supply and a signal generator, and converts electrical energy into an electrical signal of 20 - 40 kHz during operation to drive the transducer 24 to work. The transducer is composed of piezoelectric ceramic materials and metal electrodes. Under the action of the high-frequency electrical signal, the piezoelectric material undergoes telescopic vibration and converts electrical energy into mechanical energy; the coil is wound by copper wire and is wrapped outside the transducer. During operation, an alternating magnetic field is generated by a high-frequency current to drive the piezoelectric material in the transducer to vibrate; the horn is made of high-strength metal (such as titanium alloy, stainless steel, or aluminum alloy), and mainly amplifies the small-amplitude vibration generated by the transducer and transmits it to the rolling body. The rolling body adopts a cemented carbide ball with a diameter of 8 - 12 mm to provide rolling and high-frequency vibration, and its vibration frequency and vibration amplitude are related to the magnitude of the electrical energy provided by the ultrasonic transmitter.

[0042] In this embodiment, the rotary clamping mechanism is arranged at one end of the moving direction of the horizontal moving mechanism; the rotary clamping mechanism includes a motor, a belt pulley 20, a main shaft 21, a taper sleeve 22, a box body 2, a partition plate 1, a rib plate 3, a flange plate 23, and a three-jaw chuck 4; the box body 2 is fixed to the support seat 19 by bolts, and the support seat 19 is fixedly connected to the frame 18 by bolt connection; both ends of the box body 2 are installed with partition plates 1 by bolts, and a taper sleeve 22 is installed on the outer side surface of the partition plate 1, and a rib plate 3 is arranged on the box body; to prevent impurities and dust from contacting the main shaft and causing wear, reduce potential safety hazards, and strengthen the strength of the box body; the belt pulley 20 is located on one side of the box body 2, and the belt pulley 20 is connected to the motor by a transmission belt, and the belt pulley 20 is connected to the main shaft 21 by a key; the other end of the main shaft 21 passes through the box body 2 and the partition plates 1 and taper sleeves 22 on both sides of the box body 2 and is then connected to the three-jaw chuck 4 through the flange plate 23, and the three-jaw chuck 4 is connected to the flange plate 23 by a key; the three-jaw chuck 4 is used to fix the 3D printing metal rod 31.

[0043] In this embodiment, the cooling system includes a cooling water pump, a cooling water pipe, and a radiator, which are used to cool the device; the feedback and monitoring system includes a surface roughness meter, an infrared thermal imager, and sensors, which monitor the processing quality in real time and provide feedback; the power supply system includes a power adapter, a cable, and a voltage stabilizer, which provide electrical energy for the equipment; the safety protection system includes an emergency stop button, a safety door, and an alarm device to ensure safe operation and prevent accidents.

[0044] In this embodiment, the control system includes a control panel, and the control system is connected to the cooling system, the feedback and monitoring system, the power supply system, and the safety protection system; it is used to control the movement trajectories of the workbench and the rolling body, and adjust the ultrasonic frequency, power, and rolling parameters.

[0045] The present invention can not only perform ultrasonic-assisted rolling on 3D printed metal rod-shaped specimens, but also perform ultrasonic-assisted rolling on 3D printed metal plate-shaped specimens through a three-jaw chuck and a plate fixture.

[0046] The present invention provides a usage method for any of the above 3D printed metal material fatigue life enhancement devices based on ultrasonic-assisted rolling. The specific implementation of this method is to perform ultrasonic-assisted rolling treatment on the material surface after 3D printing. This can not only effectively eliminate surface defects, introduce residual compressive stress, and improve the surface morphology, thereby improving the fatigue life of 3D printed metal materials, but also process different metal materials (such as stainless steel, pure copper, titanium alloy, etc.), support various workpiece forms (plate-shaped and rod-shaped), and adapt to 3D printed metal parts of different shapes. Specifically, it includes the following steps:

[0047] Step 1: Turn on the power of the ultrasonic vibration device; start the control system, and set the ultrasonic vibration parameters according to the material type and process requirements, including parameters such as frequency and amplitude (refer to Table 1); the device performs self-check to ensure that components such as the ultrasonic generator, rolling head, and each control system are working properly;

[0048] Table 1

[0049]

[0050] Step 2: Fix one side of the 3D printed metal rod to be processed on the three-jaw chuck, and control the thimble to fix the other side of the 3D printed metal rod, or fix the 3D printed metal plate on the plate fixture; plan the movement path of the rolling head through the control system to ensure that all areas of the printed workpiece surface that need to be processed are covered;

[0051] Step 3: Under the control of each system, the ultrasonic rolling structure moves to a suitable position through the linear slide, electric lifting slide, and telescopic member, so that the rolling head contacts the surface of the printed workpiece with a preset pressure; the ultrasonic generator generates high-frequency electrical signals to drive the rolling head to generate ultrasonic vibrations, and the vibration frequency and amplitude are adjusted according to the preset parameters. While the ultrasonic vibration is occurring, the rolling head moves along the predetermined path to uniformly roll the surface of the printed workpiece; monitor parameters such as rolling pressure, vibration frequency, and amplitude in real time through sensors to ensure process stability;

[0052] Step 4: After completing the ultrasonic vibration rolling, stop the ultrasonic vibration, and the rolling head leaves the surface of the printed workpiece; remove the printed workpiece from the fixture and perform subsequent cooling treatment (or heat treatment as required); the rolling head returns to the initial position, and the device enters the standby state;

[0053] Step 5: After completing all operations, turn off the power system.

[0054] The above are the preferred embodiments of the present invention. All changes made according to the technical solution of the present invention, when the functions and effects produced do not exceed the scope of the technical solution of the present invention, fall within the protection scope of the present invention.

Claims

1. A 3D printed metal material fatigue life enhancement device based on ultrasonic assisted rolling, characterized in that: It includes an ultrasonic rolling device, a control system, a cooling system, a feedback and monitoring system, a power supply system and a safety protection system; the ultrasonic rolling device includes an ultrasonic rolling mechanism, a horizontal moving mechanism, a sliding rod mechanism, a ejector mechanism and a rotating clamping mechanism arranged on a frame.

2. The 3D printing metal material fatigue life enhancement device based on ultrasonic assisted rolling according to claim 1 is characterized in that: The horizontal moving mechanism includes a driving motor, a side guide rail, a side guide rail slider, two groups of horizontal moving platforms, a spiral shaft, a chuck, and a plate clamp; both ends of the spiral shaft pass through a fixed frame and are horizontally arranged on a frame, and one end of the spiral shaft is limited by a chuck, and the other end is connected to a driving motor; side guide rails and side guide rail sliders slidably connected to the side guide rails are arranged on both sides of the spiral shaft; threaded holes matching the threaded shaft are provided on the horizontal moving platform, and the horizontal moving platform is connected to the side guide rail sliders on both sides of the spiral shaft, and the horizontal movement of the horizontal moving platform is realized by the rotation of the spiral shaft under the drive of the driving motor; plate clamps and ejector mechanisms are respectively arranged on the two groups of horizontal moving platforms, and the plate clamps are used to clamp and fix 3D printed metal plates.

3. The 3D printing metal material fatigue life enhancement device based on ultrasonic assisted rolling according to claim 2 is characterized in that: The ejector mechanism comprises an ejector and a manual hydraulic pump, wherein the fixed end of the manual hydraulic pump is fixed on a horizontal movable platform, and the movable end of the manual hydraulic pump is provided with an ejector so as to control the ejector to move horizontally along the axial direction of the screw shaft through a hand crank of the manual hydraulic pump.

4. The 3D printing metal material fatigue life enhancement device based on ultrasonic assisted rolling according to claim 3 is characterized in that: The slide bar mechanism includes a linear slide, an electric lifting slide and an ultrasonic rolling mechanism fixture; the linear slide includes a horizontal guide rail arranged on one side of the horizontal moving mechanism, and a slider that slides left and right on the horizontal guide rail through a control system; the electric lifting slide includes a vertical guide rail arranged on the slider, and an ultrasonic rolling mechanism fixture that slides up and down on the vertical guide rail through a control system; the ultrasonic rolling mechanism fixture is provided with a telescopic part that moves in a direction perpendicular to the horizontal guide rail to clamp the ultrasonic rolling device.

5. The 3D printing metal material fatigue life enhancement device based on ultrasonic assisted rolling according to claim 4 is characterized in that: The telescopic member adopts an electric cylinder or an electric hydraulic cylinder, and the movable end of the telescopic member clamps the ultrasonic rolling device.

6. The 3D printing metal material fatigue life enhancement device based on ultrasonic assisted rolling according to claim 4 is characterized in that: The ultrasonic rolling mechanism includes a transducer, a horn, a rolling body clamp and a rolling body; the transducer includes a coil wound around the outside thereof and the coil is connected to an ultrasonic transmitter, and the other end of the ultrasonic transmitter is connected to a power supply system and a control system; the horn is connected to the transducer; and the rolling body is installed at the end of the horn through the rolling body clamp.

7. The 3D printing metal material fatigue life enhancement device based on ultrasonic assisted rolling according to claim 6, characterized in that: The rotating clamping mechanism is arranged at one end of the moving direction of the horizontal moving mechanism; the rotating clamping mechanism includes a motor, a pulley, a main shaft, a taper sleeve, a box, an isolation plate, a rib plate, a flange, and a three-jaw chuck; the box is fixed on a support seat, and the support seat is fixed on a frame; isolation plates are installed at both ends of the box, and a taper sleeve is installed on the outer side of the isolation plate, and a rib plate is provided on the box; the pulley is located on one side of the box, and the pulley is connected to the motor through a transmission belt, and the pulley is connected to the main shaft through a key; the other end of the main shaft passes through the box and the isolation plates and taper sleeves on both sides of the box and is connected to the three-jaw chuck through a flange, and the three-jaw chuck is connected to the flange through a key; the three-jaw chuck is used to fix 3D printed metal rods.

8. The 3D printing metal material fatigue life enhancement device based on ultrasonic assisted rolling according to claim 1, characterized in that: The cooling system includes a cooling water pump, a cooling water pipe and a radiator for cooling the device; the feedback and monitoring system includes a surface roughness meter, an infrared thermal imager, and a sensor to monitor the processing quality in real time and provide feedback; the power supply system includes a power adapter, a cable, and a voltage stabilizer to provide power for the equipment; the safety protection system includes an emergency stop button, a safety door, and an alarm device to ensure safe operation.

9. The 3D printing metal material fatigue life enhancement device based on ultrasonic assisted rolling according to claim 1, characterized in that: The control system is connected with the cooling system, the feedback and monitoring system, the power supply system and the safety protection system; and is used to control the motion trajectory of the workbench and the rolling body, and to adjust the ultrasonic frequency, power and rolling parameters.

10. The method for using the 3D printing metal material fatigue life enhancement device based on ultrasonic assisted rolling according to any one of claims 1 to 9, characterized in that: The specific steps include: Step 1: Turn on the power of the ultrasonic vibration device; start the control system and set the ultrasonic vibration parameters, including frequency and amplitude, according to the material type and process requirements; the device performs a self-check to ensure that the ultrasonic generator, rolling head, and various control system components are working properly; Step 2: Fix one side of the 3D printed metal bar to be processed on the three-jaw chuck, and control the ejector to fix the other side of the 3D printed metal bar, or fix the 3D printed metal sheet on the sheet fixture; plan the moving path of the rolling head through the control system to ensure that all areas on the printed workpiece surface that need to be processed are covered; Step 3: Under the control of each system, the ultrasonic rolling structure moves to a suitable position through the linear slide, the electric lifting slide and the telescopic parts, so that the rolling head rolls the surface of the printed workpiece evenly with a preset pressure; the rolling force, vibration frequency and amplitude are monitored in real time by sensors to ensure process stability; Step 4: After the ultrasonic vibration rolling is completed, the ultrasonic vibration is stopped, and the rolling head leaves the surface of the printed workpiece; the printed workpiece is removed from the fixture and subsequently cooled; the rolling head returns to the initial position, and the device enters the standby state; Step 5: After all operations are completed, power off the system.

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