Low stress metal 3d printing prototype

Abstract

The application relates to the technical field of metal printing, and discloses a low-stress metal 3D printing prototype, which comprises a printer body, the printer body comprises a laser generating module, a control module, a printing module and a lifting filtering module, a laser module and a total stress elimination module are arranged at the top end and the bottom end of the printing module respectively, and a plane stress elimination module is arranged at the bottom end of the lifting filtering module; the plane stress elimination module is used for eliminating the stress of a printing piece in real time during a printing stage, then the total stress elimination module is used for eliminating the stress of the printing piece after printing is completed, and the stress of the printing piece is reduced.

Description

Technical Field

[0001] This invention relates to the field of metal printing equipment technology, specifically to a low-stress metal 3D printing prototype. Background Technology

[0002] SLM (Selective Laser Melting) is a major technique in additive manufacturing of metal materials. This technology uses a laser as the energy source, scanning layer by layer through a bed of metal powder according to a pre-planned path in a 3D CAD slicing model. The scanned metal powder melts and solidifies, achieving a metallurgical bond and ultimately producing the designed metal part. SLM technology overcomes the challenges of manufacturing complex-shaped metal parts using traditional techniques. However, stress is generated during the printing process due to varying cooling rates. Existing stress relief methods and devices can only partially reduce stress in the metal part, not eliminate it, severely impacting the performance of the metal component. Summary of the Invention

[0003] The purpose of this invention is to provide a low-stress metal 3D printing prototype that uses a planar stress relief module to relieve stress in real time during the printing stage, and then uses a total stress relief module to relieve stress in the printed part after printing, thereby reducing the stress of the printed part and solving the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution: a low-stress metal 3D printing prototype, comprising a printer body, wherein the printer body includes a laser generating module, a control module, a printing module and a lifting and filtering module, wherein the top and bottom of the printing module are respectively provided with a laser module and a total stress elimination module, and a plane stress elimination module is provided at the bottom of the lifting and filtering module.

[0005] Preferably, there are five laser modules. The laser modules are connected to the laser generating module via optical cables. Four of the five laser modules are arranged in a ring around one of the modules to reduce the optical path difference of the main printing area covered by each laser module and improve the accuracy of the laser three-dimensional dynamic focusing system.

[0006] Preferably, the printing module includes front, rear, top, bottom, left, and right end plates with adjacent surfaces perpendicular to each other. Slide grooves are provided on the opposite surfaces of the front and rear end plates. A powder spreading module is provided at the top of the bottom end plate, and the powder spreading module slides in cooperation with the slide grooves. An air inlet and an air outlet are also provided on the opposite surfaces of the front and rear end plates, and the air inlet and air outlet are connected to the lifting and filtering module. A feeding module is provided on one side of the left end plate, and the feeding module cooperates with the powder spreading module. The feed inlet of the feeding module is connected to the lifting and filtering module. A heat dissipation assembly connected to the lifting and filtering module is provided at the top of the support platform.

[0007] Preferably, the total stress relief module and the powder spreading module are detachably connected. The total stress relief module includes a vibration seat with a hollow structure. A waveguide rod with a honeycomb structure is provided at the center of the top of the vibration seat. An ultrasonic transducer is provided at the top of the waveguide rod. A heat dissipation module is provided circumferentially on the outside of the ultrasonic transducer. The heat dissipation module is connected to the lifting filter module. A protective shell is provided on the outside of the heat dissipation module. A protective shell that wraps the ultrasonic transducer is provided at the top of the vibration seat. A valve is provided at the top of the protective shell.

[0008] Preferably, the bottom plate includes a slidingly fitted frame and a pressure plate. A planar stress relief module is provided at the bottom of the pressure plate. The planar stress relief module includes a vibrating frame with a concave cross-section. The vibrating frame is screwed to the pressure plate. A counterweight is screwed to the middle of the vibrating frame. An X-axis stress relief module and a Y-axis stress relief module with the same structure are screwed to the adjacent two sides of the counterweight. Both the X-axis stress relief module and the Y-axis stress relief module include a connecting plate screwed to the end face of the counterweight. A planar waveguide is provided on the connecting plate. The planar waveguide is perpendicular to the connecting plate. A planar ultrasonic transducer is provided on the planar waveguide at the end away from the connecting plate. A spiral heat dissipation pipe is provided circumferentially on the outside of the planar ultrasonic transducer. A heat insulation shell is provided outside the heat dissipation pipe. A coolant pipe is provided outside the heat insulation shell. The heat dissipation pipe is connected to the heat dissipation assembly through a multi-way valve. A base is provided on the planar ultrasonic transducer near the vibrating frame. The base is screwed to the inner side of the vibrating frame.

[0009] Preferably, the lifting filter module includes a lifting module and a metal powder filter module. An auxiliary lifting module is provided at the top of the pressure plate. The auxiliary lifting module includes a hollow lifting frame. An array of miniature lifting columns is provided at the bottom of the lifting frame. A miniature heat pipe is provided at the top of the miniature lifting column. The miniature heat pipe is connected to the heat dissipation assembly through a multi-way valve. The top of the lifting frame is provided with multiple micro-holes that slide with the miniature heat pipes. A powder collection mechanism is provided on both sides of the lifting frame. The powder collection mechanism includes an air blowing tube bundle and a recovery tube bundle. An air inlet and a recovery outlet are provided on the air blowing tube bundle and the recovery tube bundle, respectively. Through holes that cooperate with the powder collection mechanism are opened on the side plates of the lifting frame.

[0010] Preferably, a main lifting module is screwed to both sides of the pressure plate. At the bottom of the main lifting module, there is an installation frame mounted on the top of the filter module. The installation frame is equipped with a liquid collection tank and a gas collection tank. The liquid collection tank is connected to the heat dissipation assembly through a liquid collection pipe. At the bottom of the liquid collection tank, there is a micro liquid pump. The inlet of the micro liquid pump is connected to the liquid collection tank, and the outlet of the micro liquid pump is connected to the micro heat pipe and the heat dissipation pipe through a pipe. At the bottom of the gas collection tank, there is a micro air pump. The inlet of the micro air pump is connected to the micro heat pipe and the heat dissipation pipe through a pipe, and the gas collection tank is connected to the heat dissipation assembly through an air supply pipe.

[0011] Preferably, the micro heat pipe includes a coaxial outer tube and an inner tube. The top end of the outer tube is provided with a horizontal plate, and the top end of the inner tube is provided with a pipe opening that communicates with the outer tube. The outer tube and the inner tube are fixedly connected by a connecting plate. A micro heat pipe one-way valve that communicates with a multi-way valve is provided at one end of the micro heat pipe.

[0012] Preferably, the miniature heat pipe single-way valve includes an inner valve body and an outer valve body, which are respectively sealed to the inner pipe and the outer pipe. The area enclosed by the inner valve body constitutes an inner pipe, which is connected to the inner pipe. The inner valve body and the outer valve body are fixedly connected by a valve body, and a through hole is provided on the valve body.

[0013] Preferably, the heat dissipation assembly includes honeycomb-shaped clustered heat pipes, the structure of which is the same as that of micro heat pipes, and also includes a cooling fan located on one side of the clustered heat pipes, and an observation port is provided on the front end plate of the printing module.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. By distributing four of the five laser modules in a ring around one of them, the optical path difference of the main printing area covered by each laser module is reduced, the accuracy of the laser three-dimensional dynamic focusing system is improved, thereby improving the printing quality;

[0016] 2. The stress relief modules on the Y-axis and X-axis are used to perform ultrasonic stress relief on the printed metal on the horizontal plane during printing. After the metal printing is completed, the total stress relief module is used to perform ultrasonic stress relief on the printed metal in the Z-axis direction.

[0017] 3. The micro heat pipes allow the heat dissipation module to change with the shape of the printed build, enabling rapid heat transfer from the printing module. This makes the cooling rates inside and outside the printed part more similar, reducing stress. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the prototype of the present invention;

[0019] Figure 2 This is the main view of the printing module of the present invention;

[0020] Figure 3 This is a top view of the printing module of the present invention;

[0021] Figure 4 This is an isometric view of the printing module of the present invention;

[0022] Figure 5 This is a schematic diagram of the laser module of the present invention;

[0023] Figure 6 This is a schematic diagram of the Z-axis stress relief module of the present invention;

[0024] Figure 7 This is an isometric view of the Z-axis stress relief module of the present invention;

[0025] Figure 8 This is a diagram of the internal structure of the Z-axis stress relief module of the present invention;

[0026] Figure 9 This is a cross-sectional view of the Z-axis stress relief module of the present invention;

[0027] Figure 10 This is an isometric view of the X and Y axis stress relief module of the present invention;

[0028] Figure 11 This is a bottom view of the X and Y axis stress relief module of the present invention;

[0029] Figure 12 This is a partial enlarged view of the X and Y axis stress relief module of the present invention;

[0030] Figure 13 This is a cross-sectional view of the X and Y axis stress relief module of the present invention;

[0031] Figure 14 This is a schematic diagram of the lifting module of the present invention;

[0032] Figure 15 This is an isometric view of the lifting module of the present invention;

[0033] Figure 16 This is a schematic diagram of the cooling pipe of the present invention;

[0034] Figure 17 This is a cross-sectional view of the cooling pipe of the present invention.

[0035] In the diagram: Printer body 1, Laser generating module 2, Laser module 201, Lifting and filtering module 3, Control module 4, Printing module 6, Left end plate 601, Rear end plate 602, Air outlet 603, Slide 604, Bottom end plate 605, Support platform 606, Pressure plate 607, Vibration frame 608, Y-axis stress relief module 609, X-axis stress relief module 610, Counterweight 611, Connecting plate 612, Planar waveguide rod 613, Heat insulation shell 614, Base 615, Planar ultrasonic transducer 616, Heat dissipation pipe 617, Lifting module 7, Main lifting module 701, Liquid collection pipe 702, Gas transmission pipe 70 3. Auxiliary lifting module 704, air inlet 705, mounting frame 706, liquid collection tank 707, micro liquid pump 708, micro air pump 709, air collection tank 710, micro heat pipe 8, outer pipe 801, connecting plate 802, inner pipe 803, micro heat pipe single-way valve 9, outer valve body 901, valve body 902, through hole 903, inner valve body 904, inner pipe 905, total stress relief module 10, protective shell 101, vibration seat 102, protective shell 104, valve 103, heat dissipation module 105, auxiliary lifting module 704, waveguide rod 107, ultrasonic transducer 106, feeding module 11, powder spreading module 12. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0037] like Figures 1-5 As shown, Figure 1 This is a schematic diagram of the prototype of the present invention; Figure 2 This is the main view of the printing module of the present invention; Figure 3 This is a top view of the printing module of the present invention; Figure 4 This is an isometric view of the printing module of the present invention; Figure 5 This is a schematic diagram of the laser module of the present invention;

[0038] This embodiment provides a low-stress metal 3D printing prototype, including a printer body 1. The printer body 1 includes a laser generating module 2, a control module 4, a printing module 6, and a lifting and filtering module 3. The control module 4 is installed at the top of the laser generating module 2, the lifting and filtering module 3 is located on the left side of the laser generating module 2, and the printing module 6 is located above the lifting and filtering module 3. This makes the metal 3D printing prototype compact in structure and adopts a modular design, which facilitates the disassembly, assembly, and maintenance of each module. The top and bottom of the printing module 6 are respectively provided with a laser module 201 and a total stress relief module 10. A planar stress relief module is provided at the bottom of the lifting and filtering module 3, thereby realizing the stress relief operation of the printed structure.

[0039] In one embodiment, there are five laser modules 201. The laser modules 201 are connected to the laser generating module 2 via optical cables. It can be understood that, since the focal plane of the laser in the polarization scanning system is a spherical plane with the laser module 201 as the center, three-dimensional dynamic focusing technology is usually used to compensate for the laser scanning focusing error. By distributing four of the five laser modules 201 in a ring around one of them, with each of the four laser modules 201 spaced 90 degrees apart, the optical path difference of the main printing area covered by each laser module 201 is reduced, thereby improving the accuracy of the laser three-dimensional dynamic focusing system and improving the printing quality.

[0040] In one embodiment, the printing module 6 includes front, rear, top, bottom, and left and right end plates with adjacent surfaces perpendicular to each other. Slide grooves 604 are provided on the opposite surfaces of the front and rear end plates 602. A powder-spreading module 12 is provided at the top of the bottom end plate 605, and the powder-spreading module 12 slides in cooperation with the slide grooves 604. An air inlet and an air outlet 603 are also provided on the opposite surfaces of the front and rear end plates 602, and the air inlet and air outlet 603 are connected to the lifting and filtering module 3. A feeding module 11 is provided on one side of the left end plate 601, and the feeding module 11 cooperates with the powder-spreading module 12. The inlet of the feeding module 11 is connected to the lifting and filtering module 3. A heat dissipation assembly connected to the lifting and filtering module 3 is provided at the top of the support platform 606.

[0041] Understandably, the feeding module 11 delivers the metal powder to the powder spreading module 12, which spreads the powder evenly on the bottom plate 605. Then, the laser module 201 heats and melts the metal powder. The lifting and filtering module 3 then blows inert gas into the printing module 6 through the air inlet, blowing away the fumes generated when the metal powder melts. The gas then enters the lifting and filtering module 3 through the air outlet 603 for filtration, allowing the powder to be recycled. The gas is then discharged after being treated harmlessly by the treatment module.

[0042] like Figure 6-9 As shown, Figure 6 This is a schematic diagram of the Z-axis stress relief module of the present invention; Figure 7 This is an isometric view of the Z-axis stress relief module of the present invention; Figure 8 This is a diagram of the internal structure of the Z-axis stress relief module of the present invention; Figure 9 This is a cross-sectional view of the Z-axis stress relief module of the present invention;

[0043] In one embodiment, the total stress relief module 10 is detachably connected to the powder spreading module 12. The total stress relief module 10 includes a vibration seat 102, which has a hollow structure. A waveguide rod 107 with a honeycomb structure is provided at the center of the top of the vibration seat 102. An ultrasonic transducer 106 is provided at the top of the waveguide rod 107. A heat dissipation module 105 is provided circumferentially on the outside of the ultrasonic transducer 106. The heat dissipation module 105 is connected to the lifting filter module 3. A protective shell 104 is provided on the outside of the heat dissipation module 105. A protective shell 101 that wraps the ultrasonic transducer 106 is provided at the top of the vibration seat 102. A valve 103 is provided at the top of the protective shell 104.

[0044] Understandably, the vibration seat 102 is detachably fixed to the bottom plate 605. After the printed component is completed, the ultrasonic transducer 106 converts electrical energy into mechanical energy, and then the isomorphic waveguide 107 transmits the vibration to the printed component to perform stress relief work on the printed component. This causes the printed component to generate ultrasonic resonance under the action of the ultrasonic transducer 106, resulting in microscopic deformation inside the component and eliminating the internal residual stress caused by heat cooling.

[0045] like Figure 10-13 As shown, Figure 10 This is an isometric view of the X and Y axis stress relief module of the present invention; Figure 11 This is a bottom view of the X and Y axis stress relief module of the present invention; Figure 12 This is a partial enlarged view of the X and Y axis stress relief module of the present invention; Figure 13 This is a cross-sectional view of the X and Y axis stress relief module of the present invention;

[0046] In one embodiment, the bottom plate 605 includes a slidingly fitted frame and a pressure plate 607. A plane stress relief module is provided at the bottom end of the pressure plate 607. The plane stress relief module includes a vibration frame 608 with a concave cross-section. The vibration frame 608 is screwed to the pressure plate 607. A counterweight 611 is screwed to the middle of the vibration frame 608. A support platform 606 is provided between the counterweight 611 and the vibration frame 608. An X-axis stress relief module 610 and a Y-axis stress relief module 609 with identical structures are screwed to adjacent sides of the counterweight 611. Both the X-axis stress relief module 610 and the Y-axis stress relief module include a screwed-in counterweight 609. The connecting plate 612 on the end face of the weight 611 is provided with a planar waveguide 613. The planar waveguide 613 is perpendicular to the connecting plate. A planar ultrasonic transducer 616 is provided on the planar waveguide 613 away from the connecting plate. A spiral heat dissipation pipe 617 is provided circumferentially on the outside of the planar ultrasonic transducer 616. A heat insulation shell 614 is provided outside the heat insulation shell 617. A coolant pipe 618 is provided outside the heat insulation shell 614. The heat dissipation pipe 617 is connected to the heat dissipation assembly through a multi-way valve. A base 615 is provided on the end of the planar ultrasonic transducer 616 near the vibrating frame 608. The base 615 is screwed to the inner side of the vibrating frame 608.

[0047] Understandably, after the metal powder in each layer melts during the operation of the laser module 201, the control module 4 controls the X-axis stress relief module 610 and the Y-axis stress relief module 609 to work. Since they are fixedly connected to the bottom plate 605 through the vibration frame 608, the X-axis stress relief module 610 and the Y-axis stress relief module 609 convert electrical energy into mechanical energy. Through vibration, the X-axis stress relief module 610, the Y-axis stress relief module 609 and the bottom plate 605 together generate ultrasonic resonance, causing microscopic deformation inside the component and eliminating residual stress inside the metal component.

[0048] like Figure 14-17 As shown, Figure 14 This is a schematic diagram of the lifting module of the present invention; Figure 15 This is an isometric view of the lifting module of the present invention; Figure 16 This is a schematic diagram of the cooling pipe of the present invention; Figure 17 This is a cross-sectional view of the cooling pipe of the present invention.

[0049] In one embodiment, the lifting filter module 3 includes a lifting module 7 and a metal powder filter module. An auxiliary lifting module 704 is provided at the top of the pressure plate 607. The auxiliary lifting module 704 includes a hollow lifting frame. A series of miniature lifting columns are provided at the bottom of the lifting frame. A miniature heat pipe 8 is provided at the top of the miniature lifting column. The miniature heat pipe 8 is connected to the heat dissipation assembly through a multi-way valve. The top of the lifting frame is provided with multiple micro-holes that slide with the miniature heat pipe 8. A powder collection mechanism is provided on both sides of the lifting frame. The powder collection mechanism includes an air blowing tube bundle and a recovery tube bundle. An air inlet 705 and a recovery outlet are provided on the air blowing tube bundle and the recovery tube bundle, respectively. Through holes that cooperate with the powder collection mechanism are opened on the side plates of the lifting frame, which are not shown in the figure.

[0050] Understandably, the micro heat pipe 8 extends out of the lifting frame during printing to support the printed component. After printing one layer, the micro heat pipe 8 corresponding to the next layer pattern is lowered, while the positions of the other micro heat pipes 8 remain unchanged. This ensures that the micro heat pipe 8 is always in close contact with the printed component during printing, improving the cooling effect of the printed component. Inert gas is sent into the lifting frame through the air inlet via the metal powder filter module, blowing out the powder that falls into the lifting frame. The powder is then processed by the metal powder filter module and sent back into the feeding module 11.

[0051] In one embodiment, a main lifting module 701 is screwed to the left and right sides of the pressure plate 607. A mounting frame 706 is provided at the bottom of the main lifting module 701 and installed on the top of the filter module. A liquid collection tank 707 and a gas collection tank 710 are provided on the mounting frame 706. The liquid collection tank 707 is connected to the heat dissipation assembly through a liquid collection pipe 702. A micro liquid pump 708 is provided at the bottom of the liquid collection tank 707. The liquid inlet of the micro liquid pump 708 is connected to the liquid collection tank 707. The outlet of the micro liquid pump 708 is connected to the micro heat pipe 8 and the heat dissipation pipe 617 through a pipe. A micro air pump 709 is provided at the bottom of the gas collection tank 710. The air inlet of the micro air pump 709 is connected to the micro heat pipe 8 and the heat dissipation pipe 617 through a pipe. The gas collection tank 710 is connected to the heat dissipation assembly through an air supply pipe 703.

[0052] The micro heat pipe 8 includes a coaxial outer tube 801 and an inner tube 803. The top end of the outer tube 801 is provided with a horizontal plate, and the top end of the inner tube 803 is provided with a pipe opening, so that the inner tube 803 and the outer tube 801 are connected. The outer tube 801 and the inner tube 803 are fixedly connected by a connecting plate 802. A micro heat pipe one-way valve 9 connected to a multi-way valve is provided at one end of the micro heat pipe 8.

[0053] The miniature heat pipe single-way valve 9 includes an inner valve body 904 and an outer valve body 901. The inner valve body 904 and the outer valve body 901 are respectively sealed to the inner tube 803 and the outer tube 801. The area enclosed by the inner valve body 904 forms an inner pipe 905. The inner pipe 905 is connected to the inner tube 803. The inner valve body 904 and the outer valve body 901 are fixedly connected by a valve body 902. A through hole 903 is provided on the valve body 902.

[0054] It is understandable that heat is transferred from the printing component to the coolant inside the micro heat pipe 8 through the micro heat pipe 8 close to the printing component. That is, in the micro heat pipe 8 in the printing module 6, the coolant flows through the channel between the outer pipe 801 and the inner pipe 803. The coolant is heated and vaporized into gas. Then, under the action of the micro air pump 709, the gaseous coolant is transported through the inner pipe 803 to the gas collection box 710. The gaseous coolant enters the heat dissipation assembly along the gas delivery pipe 703, cools down, and then re-condenses into liquid. It is then sent into the liquid collection box 707 along the liquid collection pipe 702. The liquid coolant in the liquid collection box 707 is sent through the micro liquid pump 708 and the multi-way valve into the micro heat pipe 8 of the lifting frame and the heat dissipation pipe 617 of the plane stress relief mold. Then, it is sent into the micro heat pipe through the micro heat pipe single-way valve 9, and then the cycle continues.

[0055] The heat dissipation assembly includes a honeycomb-shaped cluster heat pipe, the structure of which is the same as that of the micro heat pipe 8. It also includes a cooling fan located on one side of the cluster heat pipe, and an observation port is provided on the front end plate of the printing module 6.

[0056] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A low-stress metal 3D printing prototyper comprising a printer body, characterized in that: The printer body comprises a laser generating module, a control module, a printing module and a lifting filtering module, the top end and the bottom end of the printing module are respectively provided with a laser module and a total stress elimination module, and the bottom end of the lifting filtering module is provided with a plane stress elimination module; The laser module has five laser modules, the laser module is connected with the laser generating module through an optical cable, and four of the five laser modules are distributed around one of the annular modules; The printing module comprises front and rear end plates and left and right end plates which are perpendicular to each other, the opposite surfaces of the front and rear end plates are provided with sliding grooves, the top end of the bottom end plate is provided with a powder laying module, the powder laying module is in sliding fit with the sliding grooves, the opposite surfaces of the front and rear end plates are further provided with air inlets and air outlets, the air inlets and air outlets are communicated with the lifting filtering module, a feeding module is arranged on one side of the left end plate and is matched with the powder laying module, the feeding module is communicated with the lifting filtering module through an inlet, and a heat dissipation assembly is arranged on the top end of the support platform and is communicated with the lifting filtering module; The total stress elimination module is detachably connected with the powder laying module, the total stress elimination module comprises a shock seat, the shock seat has a hollow structure, a wave guide rod is arranged at the top end of the shock seat, the wave guide rod has a honeycomb structure, an ultrasonic transducer is arranged at the top end of the wave guide rod, a heat dissipation module is arranged on the outer side of the ultrasonic transducer, the heat dissipation module is communicated with the lifting filtering module, a protective shell is arranged on the outer side of the heat dissipation module, a protective shell is arranged on the top end of the shock seat and wraps the ultrasonic transducer, and a valve is arranged on the top end of the protective shell; The bottom end plate comprises a frame and a pressure bearing plate in sliding fit, the bottom end of the pressure bearing plate is provided with a plane stress elimination module, the plane stress elimination module comprises a concave-shaped vibration frame, the vibration frame is screwed with the pressure bearing plate, a counterweight is screwed in the middle of the vibration frame, X-axis stress elimination modules and Y-axis stress elimination modules which are the same in structure are screwed on the adjacent two sides of the counterweight, the X-axis stress elimination modules and the Y-axis stress elimination modules each comprise a connecting plate screwed on the end face of the counterweight, a plane wave guide rod is arranged on the connecting plate and is perpendicular to the connecting plate, a plane ultrasonic transducer is arranged on the plane wave guide rod away from the connecting plate, a spiral heat dissipation pipe is arranged on the outer side of the plane ultrasonic transducer, a heat insulation shell is arranged on the outer side of the heat dissipation pipe, a coolant pipe is arranged on the outer side of the heat insulation shell, the heat dissipation pipe is communicated with the heat dissipation assembly through a multi-way valve, and a base is arranged on the plane ultrasonic transducer close to the vibration frame and is screwed on the inner side of the vibration frame; The lifting filtering module comprises a lifting module and a metal powder filtering module, the top end of the pressure bearing plate is provided with an auxiliary lifting module, the auxiliary lifting module comprises a hollow lifting frame, a plurality of micro lifting columns are arranged in an array on the inner bottom end of the lifting frame, a micro heat pipe is arranged on the top end of the micro lifting column, the micro heat pipe is communicated with the heat dissipation assembly through a multi-way valve, a plurality of micro holes are arranged on the top end of the lifting frame and are in sliding fit with the micro heat pipe, powder collecting mechanisms are arranged on the two sides of the lifting frame, the powder collecting mechanisms comprise a blowing pipe bundle and a recovery pipe bundle, air inlets and recovery ports are arranged on the blowing pipe bundle and the recovery pipe bundle respectively, and through holes are formed on the two side plates of the lifting frame and are matched with the powder collecting mechanisms.

2. The low-stress metal 3D printing prototyper of claim 1, wherein: The pressure bearing plate is screw-connected with main lifting modules on left and right sides, and the installation frame installed on the top end of the filter module is arranged at the bottom end of the main lifting module, the liquid collecting tank and the gas collecting tank are arranged on the installation frame, the liquid collecting tank is communicated with the heat dissipation assembly through the liquid collecting pipeline, the micro liquid pump is arranged at the bottom end of the liquid collecting tank, the inlet of the micro liquid pump is communicated with the liquid collecting tank, the outlet of the micro liquid pump is communicated with the micro heat pipe and the heat dissipation pipe through the pipeline, the gas inlet of the micro gas pump is communicated with the micro heat pipe and the heat dissipation pipe through the pipeline, and the gas collecting tank is communicated with the heat dissipation assembly through the gas pipeline.

3. The low-stress metal 3D printing prototyper of claim 2, wherein: The micro heat pipe comprises coaxial outer pipe and inner pipe, the horizontal plate is arranged at the top end of the outer pipe, and the outer pipe and the inner pipe are fixedly connected through the connecting plate arranged therebetween.

4. The low-stress metal 3D printing prototyper of claim 3, wherein: The micro heat pipe single-way valve comprises inner valve body and outer valve body, the inner valve body and the outer valve body are sealingly connected with the inner pipe and the outer pipe respectively, the area surrounded by the inner valve body forms the inner pipeline, the inner pipeline is communicated with the inner pipe, and the inner valve body and the outer valve body are fixedly connected through the valve body arranged therebetween.

5. The low-stress metal 3D printing prototyper of claim 4, wherein The heat dissipation assembly comprises the honeycomb-shaped bundled heat dissipation pipe, the structure of the bundled heat dissipation pipe is same as that of the micro heat pipe, further comprises the heat dissipation fan arranged on one side of the bundled heat dissipation pipe, and the observation port is arranged on the front end plate of the printing module.

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