A low-stress additive manufacturing equipment

Abstract

This invention discloses a low-stress additive manufacturing equipment, relating to the field of stress control technology in additive manufacturing. It includes a main body of the equipment, an inner guide rail fixedly mounted on the lower surface of a printing substrate, and several sliding rods radially mounted between an outer guide rail and the inner guide rail. A titanium alloy amplitude transformer connected to a high-energy acoustic beam exciter is mounted on the upper part of the sliding rods, and an assembly and fixing mechanism is provided at one end of the sliding rod near the outer guide rail. The high-energy acoustic beam generated by the high-energy acoustic beam exciter enters the product being printed through the printing substrate, thereby effectively reducing and controlling the internal stress. Furthermore, it allows for flexible adjustment of the positions of multiple high-energy acoustic beam exciters according to the shape and size of the product, and the number of high-energy acoustic beam exciters can be increased or decreased according to actual usage needs. Simultaneously, it ensures tight coupling between the upper surface of the titanium alloy amplitude transformer and the printing substrate.

Description

Technical Field

[0001] This invention relates to the field of stress control technology in additive manufacturing, specifically to a low-stress additive manufacturing device. Background Technology

[0002] 3D printing (3DP), also known as additive manufacturing, is a rapid prototyping technology. It's a technique that uses digital model files as a basis and employs bondable materials such as powdered or filamentary metals or plastics to construct objects layer by layer. It's commonly used in mold making and industrial design for creating models, and has gradually been applied to the direct manufacturing of some products; parts printed using this technology already exist. This technology has applications in jewelry, footwear, industrial design, architecture, engineering and construction (AEC), automotive, aerospace, dental and medical industries, education, geographic information systems, civil engineering, firearms, and other fields.

[0003] When printing and molding bondable materials such as powdered or filamentous metals or plastics, the materials are usually heated to a high temperature to molten state. Then, the "printing material" is layered on top of each other under computer control. During this process, the temperature of the molded product gradually decreases, resulting in uneven temperature distribution and internal stress. However, current printing equipment cannot effectively reduce and control the large internal stress of the product while printing, which can cause product deformation, affecting the processing accuracy and performance of the parts, and even leading to cracking and scrapping, resulting in material waste. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a low-stress additive manufacturing device. It features a high-energy acoustic beam generated by a high-energy acoustic beam exciter that penetrates the printed product through a printing substrate. This allows for timely and effective stress reduction and control, preventing deformation, cracking, or scrapping of the product due to internal stress during printing. This ensures the machining accuracy and performance of the parts, guaranteeing the quality of the products printed by the additive manufacturing equipment and avoiding material waste. Furthermore, the device allows for flexible adjustment of the positions of multiple high-energy acoustic beam exciters based on the product's shape and size, enabling the exciter array to adapt to various products and perform stress relief control on different products. This improves the device's versatility and adaptability. The number of high-energy acoustic beam exciters can be increased or decreased according to actual usage needs, further enhancing the device's flexibility and versatility. Simultaneously, it ensures tight coupling between the upper surface of the titanium alloy amplitude transformer and the printing substrate, guaranteeing continuous and non-destructive injection of the ultrasonic beam into the product, thus ensuring effective stress relief and control. These advantages solve the problems mentioned in the background technology.

[0005] To achieve the goal of the high-energy acoustic beam generated by the aforementioned high-energy acoustic beam exciter entering the product being printed through the printing substrate, and thus effectively reducing and controlling internal stress, this method effectively prevents deformation, cracking, or scrapping of the product due to internal stress during the printing process. This ensures the machining accuracy and subsequent performance of the parts, thereby guaranteeing the quality of products printed by additive manufacturing equipment and avoiding material waste. Furthermore, it allows for free and flexible adjustment of the positions of multiple high-energy acoustic beam exciters according to the shape and size of the product, enabling the exciter array to adapt to various products and perform stress relief control on different products. To improve the versatility and adaptability of the equipment, and to allow for adjustments to the number of high-energy acoustic beam exciters based on actual usage requirements, further enhancing the equipment's flexibility and versatility, while ensuring tight coupling between the upper surface of the titanium alloy amplitude transformer and the printing substrate, thereby ensuring the continuous and undamaged injection of ultrasonic beams into the product, and thus guaranteeing the effect of stress relief and control, the present invention provides the following technical solution: a low-stress additive manufacturing equipment, comprising an additive manufacturing equipment body, wherein a hollow leveling frame is provided inside the additive manufacturing equipment body directly below the print head, and a horizontally arranged printing substrate is mounted on the leveling frame;

[0006] An inner guide rail is fixedly installed in the middle of the lower surface of the printing substrate, and an outer guide rail is fixedly installed on the lower surface of the printing substrate outside the inner guide rail. Several sliding rods are installed radially between the outer guide rail and the inner guide rail, and an inverted L-shaped slider is sleeved on the outside of the sliding rod.

[0007] A high-energy acoustic beam exciter is mounted on the lower surface of the slider, and a titanium alloy amplitude transformer connected to the high-energy acoustic beam exciter is mounted on the upper part of the slider. The titanium alloy amplitude transformer abuts against the lower surface of the printing substrate.

[0008] Preferably, both the outer guide rail and the inner guide rail are circular in shape, the diameter of the outer guide rail is larger than the diameter of the inner guide rail, the outer guide rail and the inner guide rail are coaxially arranged, and the cross-sectional shape of both the outer guide rail and the inner guide rail is L-shaped.

[0009] Preferably, the slide rod has a connecting groove adapted to the inner guide rail at one end near the inner guide rail. The slide rod slides on the outside of the inner guide rail through the connecting groove. The slide rod also has a guide groove inside along its length direction, and the guide groove passes through the slide rod along its thickness direction.

[0010] Preferably, an assembly and fixing mechanism is provided at one end of the slide rod near the outer guide rail. The assembly and fixing mechanism includes a pressure block inserted into the guide groove. The pressure block is in the shape of an inverted L. A fixing bolt is fixedly installed on the outer side of the pressure block. A through hole adapted to the fixing bolt is opened between the outer end of the guide groove and the outer end face of the slide rod. The fixing bolt is inserted through the through hole, and a fixing nut is installed on the external thread of the fixing bolt. The fixing nut abuts against the outer end face of the slide rod.

[0011] Preferably, the pressure block is sleeved on the inner side of the outer guide rail, and the end of the slide rod near the outer guide rail abuts against the lower surface of the outer guide rail.

[0012] Preferably, a fixing plate is fixedly installed on the high-energy sound beam exciter, and hexagon socket screws are installed at the four corners of the fixing plate. Screw holes adapted to the hexagon socket screws are opened at the four corners of the lower surface of the slider, and the hexagon socket screws are threaded into the screw holes.

[0013] Preferably, the transmitting end of the high-energy acoustic beam exciter is fixedly provided with a connecting bolt, the titanium alloy amplitude rod is inserted into the slider, the lower part of the titanium alloy amplitude rod is provided with a threaded hole extending to the lower end, and the titanium alloy amplitude rod is threadedly installed on the connecting bolt through the threaded hole.

[0014] Preferably, a tightening mechanism is provided on both sides of the fixing plate. The tightening mechanism includes two protrusions fixedly disposed on the outer sides of the fixing plate. A tightening bolt is inserted through the inside of the protrusion. The tightening bolt is inserted vertically into the inside of the guide groove. An inverted U-shaped pressure plate is fixedly installed at the upper end of the tightening bolt. The pressure plate is sleeved on the slide rod. An anti-slip pad is fixedly disposed on the inner surface of the pressure plate and abuts against the slide rod. A tightening nut is threaded on the lower part of the tightening bolt and abuts against the lower surface of the protrusion.

[0015] Compared with the prior art, the present invention provides a low-stress additive manufacturing apparatus, which has the following beneficial effects:

[0016] 1. This low-stress additive manufacturing equipment uses a slide bar and slider to mount a high-energy acoustic beam exciter and a titanium alloy amplitude transformer on the lower part of the printing substrate. During printing, the high-energy acoustic beam generated by the high-energy acoustic beam exciter enters the product being printed through the printing substrate, effectively reducing and controlling the internal stress. This effectively prevents deformation, cracking, or scrapping of the product due to internal stress during the printing process, thereby ensuring the machining accuracy and subsequent performance of the parts. This, in turn, ensures the quality of the products printed by the additive manufacturing equipment and avoids material waste.

[0017] 2. This low-stress additive manufacturing equipment, through the coordinated arrangement of outer guide rails, inner guide rails, slide bars, and sliders, can achieve the purpose of freely and flexibly adjusting the position of multiple high-energy acoustic beam exciters according to the shape and size of the product. This allows the exciter array to be adapted to various products, thereby performing stress relief control work on different products and improving the versatility and adaptability of the equipment.

[0018] 3. This low-stress additive manufacturing equipment, through the assembly and fixing mechanism, allows the slide bar, the slider mounted on it, the high-energy acoustic beam exciter, and the titanium alloy amplitude transformer to be removed. Then, the upper surface of the titanium alloy amplitude transformer can be coated with a coupling medium. The assembly and fixing mechanism can also be used to adjust the number of high-energy acoustic beam exciters according to actual usage needs, further improving the flexibility and versatility of the equipment. At the same time, the mechanism can also be used to fix the slide bar after the position is adjusted, ensuring the stability of the slide bar during the printing process.

[0019] 4. This low-stress additive manufacturing equipment, through the setting of the clamping mechanism, can fix the slider on the slide rod, ensuring the stability of the slider during the printing process. At the same time, the upper surface of the titanium alloy amplitude transformer on the slider is tightly attached to the lower surface of the printing substrate. Since the upper surface of the titanium alloy amplitude transformer is coated with a coupling medium, the tight coupling between the upper surface of the titanium alloy amplitude transformer and the printing substrate can be ensured, thereby ensuring that the ultrasonic beam can be continuously and without damage injected into the product, thus ensuring the effect of stress relief and control. Attached Figure Description

[0020] Figure 1 This is a frontal three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a bottom-view three-dimensional structural diagram of the printing substrate of the present invention;

[0022] Figure 3 This is a frontal view of a partial structural diagram of the present invention;

[0023] Figure 4 This is a three-dimensional structural diagram of the exciter array of the present invention viewed from below;

[0024] Figure 5 This is a top-view three-dimensional structural diagram of the exciter array of the present invention;

[0025] Figure 6 This is a frontal three-dimensional structural diagram of the slide bar of the present invention;

[0026] Figure 7 This is a three-dimensional structural diagram of the slide bar of the present invention viewed from below;

[0027] Figure 8 This is a schematic diagram of the front sectional view of the slide bar of the present invention;

[0028] Figure 9 For the present invention Figure 8 Enlarged structural diagram at point A in the middle;

[0029] Figure 10 This is a side-view cross-sectional three-dimensional structural diagram of the slide bar of the present invention;

[0030] Figure 11 This is a partial cross-sectional view of the titanium alloy amplitude transformer of the present invention.

[0031] In the diagram: 1. Main body of additive manufacturing equipment; 2. Leveling frame; 3. Printing substrate; 4. Outer guide rail; 5. Inner guide rail; 6. Slide bar; 601. Connecting groove; 602. Guide groove; 7. Slider; 8. High-energy sound beam exciter; 801. Fixing plate; 802. Socket head screw; 803. Connecting bolt; 9. Assembly and fixing mechanism; 901. Pressure block; 902. Fixing bolt; 903. Fixing nut; 10. Tightening mechanism; 1001. Protrusion; 1002. Tightening bolt; 1003. Pressure plate; 1004. Tightening nut; 1005. Anti-slip pad; 11. Titanium alloy amplitude transformer; 1101. Threaded hole. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] For one embodiment of the present invention, please refer to [link / reference]. Figures 1 to 5 A low-stress additive manufacturing equipment includes an additive manufacturing equipment body 1. Inside the additive manufacturing equipment body 1, directly below the print head, there is a hollow leveling frame 2. A horizontally arranged printing substrate 3 is mounted on the leveling frame 2.

[0034] An inner guide rail 5 is fixedly installed in the middle of the lower surface of the printing substrate 3, and an outer guide rail 4 is fixedly installed on the lower surface of the printing substrate 3 outside the inner guide rail 5. Several slide rods 6 are installed radially between the outer guide rail 4 and the inner guide rail 5, and an inverted L-shaped slider 7 is sleeved on the outside of the slide rod 6.

[0035] Both the outer guide rail 4 and the inner guide rail 5 are circular in shape. The diameter of the outer guide rail 4 is larger than the diameter of the inner guide rail 5. The outer guide rail 4 and the inner guide rail 5 are coaxially arranged, and the cross-sectional shape of both the outer guide rail 4 and the inner guide rail 5 is L-shaped.

[0036] A high-energy acoustic beam exciter 8 is mounted on the lower surface of the slider 7, and a titanium alloy amplitude transformer 11 connected to the high-energy acoustic beam exciter 8 is mounted on the upper part of the slider 7. The titanium alloy amplitude transformer 11 abuts against the lower surface of the printing substrate 3.

[0037] In practical use, several high-energy acoustic beam exciters 8 and titanium alloy amplitude transformers 11 are installed on the lower part of the printing substrate 3 via slide bar 6 and slider 7. The titanium alloy amplitude transformers 11 coated with coupling medium are tightly attached to the lower surface of the printing substrate 3. At this time, the high-energy acoustic beam exciters 8 are formed. Therefore, during the process of the additive manufacturing equipment body 1 printing the product onto the upper surface of the printing substrate 3 through its print head, the high-energy acoustic beam exciters 8 are turned on. At this time, the ultrasonic beam generated by the exciter array composed of several high-energy acoustic beam exciters 8 is injected into the interior of the product being printed through the printing substrate 3. By changing the stress value and distribution of the local area in the material through the direction of the acoustic beam and the elastic wave fluctuation energy in the medium in the vicinity of the fluctuation range, the purpose of residual stress control is achieved. This can effectively prevent the product from deforming, cracking or scrapping due to internal stress during the printing process, thereby ensuring the processing accuracy of the parts and the performance of later use, thus ensuring the quality of the products printed by the additive manufacturing equipment and avoiding material waste.

[0038] As one embodiment of the present invention, please refer to Figures 4 to 8 A low-stress additive manufacturing device, wherein an inner guide rail 5 is fixedly installed in the middle of the lower surface of the printing substrate 3, and an outer guide rail 4 is fixedly installed on the lower surface of the printing substrate 3 outside the inner guide rail 5. Several slide rods 6 are installed radially between the outer guide rail 4 and the inner guide rail 5, and an inverted L-shaped slider 7 is sleeved on the outside of the slide rod 6.

[0039] The slide rod 6 has a connecting groove 601 that is adapted to the inner guide rail 5 at one end near the inner guide rail 5. The slide rod 6 slides on the outside of the inner guide rail 5 through the connecting groove 601. The slide rod 6 has a guide groove 602 along the length direction inside the slide rod 6. The guide groove 602 passes through the slide rod 6 along the thickness direction.

[0040] A high-energy acoustic beam exciter 8 is mounted on the lower surface of the slider 7, and a titanium alloy amplitude transformer 11 connected to the high-energy acoustic beam exciter 8 is mounted on the upper part of the slider 7. The titanium alloy amplitude transformer 11 abuts against the lower surface of the printing substrate 3.

[0041] In practical use, the slider 6 can be controlled to slide around the circumference on the outer guide rail 4 and the inner guide rail 5, thereby adjusting the position of the slider 7 and the high-energy sound beam exciter 8 on the circumference. Moreover, the slider 7 can be adjusted along the length of the slider 6, thereby adjusting the radial position of the high-energy sound beam exciter 8 within the outer guide rail 4. Through the above adjustments, the position of multiple high-energy sound beam exciters 8 can be freely and flexibly adjusted according to the shape and size of the product, so that the exciter array can be adapted to various products, thereby performing stress relief control work on different products and improving the versatility and adaptability of the equipment.

[0042] As one embodiment of the present invention, please refer to Figures 6 to 8 A low-stress additive manufacturing device, wherein a sliding rod 6 is provided with an assembly and fixing mechanism 9 at one end near the outer guide rail 4. The assembly and fixing mechanism 9 includes a pressure block 901 inserted into a guide groove 602. The pressure block 901 is in the shape of an inverted L. A fixing bolt 902 is fixedly installed on the outer side of the pressure block 901. A through hole adapted to the fixing bolt 902 is opened between the outer end of the guide groove 602 and the outer end face of the sliding rod 6. The fixing bolt 902 is inserted through the through hole, and a fixing nut 903 is installed on the external thread of the fixing bolt 902. The fixing nut 903 abuts against the outer end face of the sliding rod 6.

[0043] The pressure block 901 is fitted onto the inner side of the outer guide rail 4, and the end of the slide rod 6 near the outer guide rail 4 abuts against the lower surface of the outer guide rail 4.

[0044] In practical use, after unscrewing the fixing nut 903 from the fixing bolt 902, the pressure block 901 and the fixing bolt 902 can be removed from the guide groove 602. Then, the slide rod 6, the slider 7 mounted on it, the high-energy acoustic beam exciter 8, and the titanium alloy amplitude transformer 11 can be removed. Then, the coupling medium coating work can be carried out on the upper surface of the titanium alloy amplitude transformer 11. The number of high-energy acoustic beam exciters 8 can also be increased or decreased according to actual usage requirements through this method, further improving the flexibility and versatility of the equipment. Moreover, the slide rod... 6. After reinstalling the outer guide rail 4 and the inner guide rail 5, insert the pressure block 901 and the fixing bolt 902 back into their original positions. Finally, screw the fixing nut 903 back onto the fixing bolt 902, adjust the position of the slide rod 6, and then tighten the fixing nut 903 so that it presses tightly against the outer end face of the slide rod 6. At this time, the fixing nut 903 will also pull the pressure block 901 through the fixing bolt 902, and make the pressure block 901 press tightly against the outer guide rail 4, thus fixing the slide rod 6 on the outer guide rail 4 and the inner guide rail 5. Therefore, the assembly and fixing mechanism 9 can also be used for fixing the slide rod 6 after the position is adjusted.

[0045] As one embodiment of the present invention, please refer to Figure 6 , Figure 7 as well as Figure 11A low-stress additive manufacturing device, wherein a high-energy acoustic beam exciter 8 is mounted on the lower surface of a slider 7, and a titanium alloy amplitude transformer 11 connected to the high-energy acoustic beam exciter 8 is mounted on the upper part of the slider 7, and the titanium alloy amplitude transformer 11 abuts against the lower surface of the printing substrate 3.

[0046] A fixing plate 801 is fixedly installed on the high-energy sound beam exciter 8. Hex socket screws 802 are installed at the four corners of the fixing plate 801. Screw holes that are compatible with the hex socket screws 802 are opened at the four corners of the lower surface of the slider 7. The hex socket screws 802 are threaded into the screw holes.

[0047] The high-energy acoustic beam exciter 8 is fixedly provided with a connecting bolt 803 at the transmitting end. The titanium alloy amplitude rod 11 is inserted into the slider 7. The lower part of the titanium alloy amplitude rod 11 is provided with a threaded hole 1101 extending to the lower end, and the titanium alloy amplitude rod 11 is threadedly installed on the connecting bolt 803 through the threaded hole 1101.

[0048] In practical use, after removing the slide bar 6 from the outer guide rail 4 and the inner guide rail 5, the titanium alloy amplitude rod 11 can be unscrewed to disengage its internal threaded hole 1101 from the connecting bolt 803, thus removing the titanium alloy amplitude rod 11 from the high-energy sound beam exciter 8. Then, the internal hex screws 802 at the four corners of the fixing plate 801 can be unscrewed to remove the high-energy sound beam exciter 8 from the slider 7. Therefore, the assembly and disassembly of the high-energy sound beam exciter 8 and the titanium alloy amplitude rod 11 can be realized, which facilitates the later maintenance work.

[0049] As one embodiment of the present invention, please refer to Figures 8 to 10 A low-stress additive manufacturing device includes a clamping mechanism 10 on both sides of a fixed plate 801. The clamping mechanism 10 includes two protrusions 1001 fixedly disposed on the outer sides of the fixed plate 801. A clamping bolt 1002 is inserted through the inside of the protrusion 1001. The clamping bolt 1002 is inserted vertically into the inside of a guide groove 602. An inverted U-shaped pressure plate 1003 is fixedly installed at the upper end of the clamping bolt 1002. The pressure plate 1003 is sleeved on a slide rod 6. An anti-slip pad 1005 is fixedly disposed on the inner surface of the pressure plate 1003 and abuts against the slide rod 6. A clamping nut 1004 is threadedly installed at the lower part of the clamping bolt 1002 and abuts against the lower surface of the protrusion 1001.

[0050] In practical use, after adjusting the position of slider 7 on slide rod 6, tighten the tightening nut 1004 at the bottom of the tightening bolt 1002, so that the tightening nut 1004 presses tightly against the lower surface of protrusion 1001. This allows the tightening bolt 1002 to pull down the pressure plate 1003, and the pressure plate 1003, through the anti-slip pad 1005, presses tightly against the upper surface of slide rod 6, thereby fixing slider 7 on slide rod 6 and ensuring the stability of slider 7 during printing. Furthermore, tightening the tightening nut 1002... During the process of 004, the tightening nut 1004 will also push the fixing plate 801 and the slider 7 upward through the protrusion 1001, thereby pressing the upper surface of the titanium alloy amplitude rod 11 on the slider 7 tightly against the lower surface of the printing substrate 3. Since the upper surface of the titanium alloy amplitude rod 11 is coated with a coupling medium, the tight coupling between the upper surface of the titanium alloy amplitude rod 11 and the printing substrate 3 can be guaranteed, thereby ensuring that the ultrasonic beam can be continuously and without damage injected into the product, thus ensuring the effect of stress relief and control.

[0051] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-stress additive manufacturing apparatus comprising an additive manufacturing apparatus body, characterized by: The inside of the additive manufacturing equipment body is provided with a leveling frame with a hollow inside directly below the print head, and a horizontally arranged print substrate is installed on the leveling frame; A inner rail is fixedly installed in the middle of the lower surface of the print substrate, and an outer rail is fixedly installed outside the inner rail on the lower surface of the print substrate, a plurality of slide rods are installed between the outer rail and the inner rail in the radial direction, and a reverse L-shaped sliding block is sleeved outside the slide rod; A high-energy acoustic beam exciter is installed on the lower surface of the sliding block, and a titanium alloy amplitude lever connected with the high-energy acoustic beam exciter is installed on the upper part of the sliding block, and the titanium alloy amplitude lever abuts against the lower surface of the print substrate.

2. A low stress additive manufacturing apparatus according to claim 1, wherein: The shapes of the outer rail and the inner rail are both circular rings, the diameter of the outer rail is greater than that of the inner rail, the outer rail and the inner rail are coaxially arranged, and the cross-sectional shapes of the outer rail and the inner rail are both L-shaped.

3. A low stress additive manufacturing apparatus as claimed in claim 1, wherein: A connecting groove matched with the inner rail is formed in one end of the slide rod close to the inner rail, the slide rod is sleeved and slides outside the inner rail through the connecting groove, and a guide groove is formed in the inner part of the slide rod along the length direction, and the guide groove penetrates through the slide rod along the thickness direction.

4. A low stress additive manufacturing apparatus as claimed in claim 3, wherein: An assembly fixing mechanism is arranged at one end of the slide rod close to the outer rail, the assembly fixing mechanism comprises a pressing block inserted into the guide groove, the shape of the pressing block is reverse L-shaped, a fixing bolt is fixedly installed outside the pressing block, a through hole matched with the fixing bolt is formed between the outer end of the guide groove and the outer end surface of the slide rod, the fixing bolt is inserted into the through hole, and a fixing nut is threadedly installed outside the fixing bolt and abuts against the outer end surface of the slide rod.

5. A low stress additive manufacturing apparatus as claimed in claim 4, wherein: The pressing block is sleeved inside the outer rail, and one end of the slide rod close to the outer rail abuts against the lower surface of the outer rail.

6. A low stress additive manufacturing apparatus as claimed in claim 3, wherein: A fixing plate is fixedly installed on the high-energy acoustic beam exciter, a hexagonal socket head cap screw is installed at each corner of the fixing plate, a screw hole matched with the hexagonal socket head cap screw is formed at each corner of the lower surface of the sliding block, and the hexagonal socket head cap screw is threadedly installed in the screw hole.

7. A low stress additive manufacturing apparatus as claimed in claim 6, wherein: A connecting bolt is fixedly arranged at the emitting end of the high-energy acoustic beam exciter, the titanium alloy amplitude lever is inserted into the sliding block, a threaded hole extending to the lower end is formed in the lower part of the titanium alloy amplitude lever, and the titanium alloy amplitude lever is threadedly installed on the connecting bolt through the threaded hole.

8. A low stress additive manufacturing apparatus as claimed in claim 7, wherein: Tightening mechanisms are arranged on both sides of the fixing plate, each tightening mechanism comprises two protrusions fixedly arranged outside both sides of the fixing plate, a tightening bolt is inserted through the inside of each protrusion, the tightening bolt is inserted into the inside of the guide groove in the vertical direction, a reverse U-shaped pressing plate is fixedly installed at the upper end of the tightening bolt, the pressing plate is sleeved on the slide rod, an anti-skid pad is fixedly arranged on the inner surface of the pressing plate and abuts against the slide rod, a tightening nut is threadedly installed at the lower part of the tightening bolt and abuts against the lower surface of the protrusion.

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