Grafting printing method for semi-square-shaped structure

Abstract

The invention relates to the technical field of metal 3D printing, and discloses a grafting printing method for a semi-square-shaped structure in order to solve the technical problems that a working face of the semi-square-shaped structure is prone to damage, and a conventional mode is difficult to repair, high in cost, long in period and low in percent of pass. The fixing tool comprises a left blocking plate and a right blocking plate which are used for blocking the left side and the right side of the half-mouth character respectively, and the left blocking plate and the right blocking plate are fixedly connected with the shape follow-up ribs on the two sides of the half-mouth character through fixing bolts respectively. A middle blocking plate is further arranged, and the middle blocking plate is fixedly connected with the shape follow-up ribs in the middle of the half-mouth character through fixing bolts; blocking plate bottom feet are arranged at the bottoms of the left blocking plate, the right blocking plate and the middle blocking plate, and bolt holes used for being fixedly connected with the base plate are formed in the blocking plate bottom feet. The device has the beneficial effects of saving powder, reducing the cost, simplifying the cleaning process and enhancing the structural strength.

Description

Technical Field

[0001] The invention relates to the technical field of metal 3D printing, and in particular to a method for printing a half-mouth-shaped structure grafting. Background Art

[0002] As an important branch of 3D printing, the laser selective melting (SLM) technology uses special slicing software to discretize the three-dimensional digital model into two-dimensional plane geometric figures. Through layer-by-layer powder laying and sintering, repeated cycles until the parts are formed, this technology can achieve mold-free, fast response and short-cycle product manufacturing, greatly improving the efficiency and flexibility of the manufacturing industry. In the field of processing and manufacturing, it is often encountered that some parts structures are partially damaged due to complex working conditions or long-term service, especially the problem of partial damage to the working surface is more common. However, the working surface is usually only a small part of the part structure, and the overall structure remains intact. If these parts are scrapped directly, it will cause a huge waste of resources.

[0003] Traditional processing methods such as welding and casting often make it difficult to repair and form complex structures. This not only restricts the efficient repair and reuse of products, but also increases manufacturing costs and time. In some high-demand manufacturing fields, such as aircraft manufacturing, the half-mouth-shaped tooling that is often used is a high-value-added and easily consumable part. During the use of this type of tooling, the working surface is often worn. Due to its special geometric structure and high precision requirements, conventional repair methods are difficult to implement effectively.

[0004] Specifically, the working surface of the half-mouth tooling is prone to wear and damage due to its frequent contact and high-intensity workload during the aircraft manufacturing process. However, these damages are usually limited to the working surface, and the rest of the tooling remains intact. It is obviously uneconomical to scrap the entire tooling, but traditional repair methods such as welding and casting not only make it difficult to guarantee the quality of the repair, but also lead to a significant decrease in the performance and life of the repaired tooling. In addition, the repair process is complicated, the cycle is long, and the pass rate is low. These problems seriously affect the effective assembly and production efficiency of aircraft products.

[0005] The requirements for tooling in the field of aircraft manufacturing are very high. Not only do they require high precision and high reliability, but they also need to be repaired and reused in a short time. Due to the limitations of traditional repair methods, it is particularly important to find a method that can repair tooling efficiently, at low cost, and in a short period of time. In this context, how to achieve efficient repair and reuse of half-mouth-shaped tooling has become a technical problem that needs to be solved urgently. Summary of the invention

[0006] The purpose of the present invention is to provide a half-mouth-shaped structure grafting printing method to solve the technical problems that the working surface of the half-mouth-shaped structure is easy to be damaged, difficult to repair by conventional methods, high cost, long cycle and low pass rate.

[0007] To achieve the above-mentioned purpose, the present invention provides a method for grafting and printing a half-mouth font structure, wherein a fixing tool fixed to a substrate is provided for the half-mouth font, and the fixing tool comprises: a left blocking plate and a right blocking plate respectively blocking the left and right sides of the half-mouth font, the left blocking plate and the right blocking plate are respectively fixedly connected to the conformal ribs on both sides of the half-mouth font by fixing bolts; a middle blocking plate is also provided, and the middle blocking plate is fixedly connected to the conformal ribs in the middle of the half-mouth font by fixing bolts; blocking plate bottom feet are provided at the bottom of the left blocking plate, the right blocking plate and the middle blocking plate, and the blocking plate bottom feet are provided with bolt holes for fixed connection with the substrate.

[0008] The right side of the half-mouth font is blocked at the shaped rib, changing from an open state to a closed state, which is consistent on the left and right, and there is also a blocking plate in the middle. In this way, the half-mouth font can be completely blocked by adding a substrate. In the subsequent 3D printing grafting process, the internal cavity part does not need to be filled with powder, which greatly saves the consumption of powder. Especially for special materials or precious metals, the procurement cost of powder can be significantly reduced. In addition, this design facilitates the cleaning of powder after grafting, greatly reducing the time for powder cleaning and storage. Furthermore, the blocking plate can also serve as a reinforcing rib to strengthen the strength of the half-mouth font and significantly reduce the shrinkage deformation caused by thermal stress when the top of the half-mouth font is grafted. It has the beneficial effects of saving powder, reducing costs, simplifying the cleaning process and enhancing structural strength.

[0009] Further, the following fixing steps are included:

[0010] Step 1: Fix the middle blocking plate to the ribs in the middle of the half-mouth font by fixing bolts;

[0011] Step 2: Fix the left blocking plate, the right blocking plate and the free-standing ribs on the left and right sides of the half-mouth font by fixing bolts;

[0012] Step 3, placing the fixed assembled structure on the base plate, and fixing the base plate foot of the middle block plate on the base plate through the back of the base plate using base bolts;

[0013] Step 4: Use foot bolts to fix the foot of the left and right plugging plates to the base plate.

[0014] The half-mouth font can be firmly fixed on the forming substrate by the fixing bolts at the above-mentioned conformal ribs. In this way, when the half-mouth font is 3D printed and grafted, the movement of the scraper will not push the half-mouth font, thereby maintaining the stability of the powder spreading process.

[0015] This operation avoids the problem that the middle plugging plate bolts cannot be fixed after the left and right plugging plates are blocked. Finally, the bottom feet of the left and right plugging plates are firmly fixed on the forming base plate with fixing bolts, thereby ensuring that the half-mouth font is firmly fixed on the base plate.

[0016] Further, the following steps are included:

[0017] Step S1, fixing the fixed half-mouth font and the substrate on a 3D printing platform;

[0018] Step S2, filling metal powder into the 3D printing forming chamber to fill the gap between the shell of the half-mouth font and the forming cylinder;

[0019] Step S3, using a metal spatula to compact and fill powder gaps;

[0020] Step S4, manually operate the powder spreading scraper to spread the powder and adjust the lifting of the forming cylinder until a layer of metal powder with a predetermined thickness is left on the top of the half-mouth font;

[0021] Step S5, closing the forming cabin door and inflating the forming cabin;

[0022] Step S6, starting substrate heating;

[0023] Step S7, using 3D software to construct a 3D model that compensates for the thermal deformation of the top of the half-mouth font, and importing and adjusting the graft body 3D model to ensure consistency with the half-mouth font;

[0024] Step S8, slicing the graft, and importing the slices into 3D printing software to set forming parameters;

[0025] Step S9, printing the graft in a 3D printing device, stopping heating after printing is completed, opening the forming cabin door and removing the substrate;

[0026] Step S10, cleaning the powder on the half-mouth font and the substrate;

[0027] Step S11, placing the half font and the substrate into a vacuum heat treatment furnace for heat treatment to eliminate stress;

[0028] Step S12, using a 3D scanner to scan the grafted half-mouth font, and importing the scanned model into a 3D scanning software to compare it with the theoretical model;

[0029] Step S13, if there are defects, repair and scan again; if there are no defects, machine the grafted parts to prepare a complete half-mouth font part.

[0030] This method effectively ensures the stability and accuracy of the 3D printing process, reduces powder consumption and cleaning time, reduces material costs, enhances the structural strength of the half-mouth font, eliminates stress through heat treatment, and ultimately ensures the quality of the grafting through 3D scanning and comparison.

[0031] Furthermore, the height of the three-dimensional model is 1 to 5 mm greater than the height of the half-font removed portion.

[0032] Furthermore, the shape of the grafted body is 0.2 to 0.5 mm larger than the half-font removal portion, so as to compensate for thermal deformation during the printing process.

[0033] Further, in step S11, the vacuum heat treatment furnace is performed within 8 hours after the graft is printed.

[0034] Further, in step S4, the predetermined thickness is 0 to 0.06 mm.

[0035] The half-mouth-shaped structure grafting printing method provided by the present invention has the following advantages:

[0036] By setting a fixed fixture fixed to the substrate for the half-mouth font, the fixed fixture includes a left blocking plate and a right blocking plate for blocking the left and right sides of the half-mouth font respectively, and the left blocking plate and the right blocking plate are fixedly connected to the conformal ribs on both sides of the half-mouth font by fixing bolts respectively, and a middle blocking plate is also provided, and the middle blocking plate is fixedly connected to the conformal ribs in the middle of the half-mouth font by fixing bolts, and the bottoms of the left blocking plate, the right blocking plate and the middle blocking plate are provided with blocking plate feet, and the blocking plate feet are provided with bolt holes for fixed connection with the substrate. The conformal ribs on the right side of the half-mouth font are blocked, and the open state is changed to a closed state, which is consistent on the left and right, and there is also a blocking plate in the middle. In this way, the half-mouth font can be completely blocked by adding a substrate. In the subsequent 3D printing grafting process, the internal cavity part does not need to be filled with powder, which greatly saves the consumption of powder, especially for special materials or precious metals, and can significantly reduce the purchase cost of powder. In addition, this design helps to clean the powder after grafting, greatly reducing the time for cleaning and storing powder. Furthermore, the blocking plate can also serve as a reinforcing rib to strengthen the strength of the half-mouth font, significantly reducing the shrinkage deformation caused by thermal stress when grafting the top of the half-mouth font. This method effectively solves the technical problems of the working surface of the half-mouth structure being easy to damage, difficult to repair, high cost, long cycle, and low pass rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A front view of a half-mouth font provided by the present invention;

[0038] Figure 2 A first-view stereogram of a half-mouth font provided by the present invention;

[0039] Figure 3A second viewing stereogram of the half-mouth font provided by the present invention;

[0040] Figure 4 The present invention provides a flat top view after removing a portion of top defects;

[0041] Figure 5 A top view of the half-mouth font provided by the present invention after installation and fixation;

[0042] Figure 6 A cross-sectional view of the half-mouth font provided by the present invention after installation and fixation;

[0043] Figure 7 A three-dimensional diagram of the half-mouth font, base plate and blocking plate fixing structure provided by the present invention;

[0044] Figure 8 A three-dimensional diagram of the base plate and blocking plate fixing structure provided by the present invention.

[0045] In the figure: 11, top; 12, follow-up ribs; 13, weight-reducing holes; 15, shell; 20, base plate; 21, right blocking plate; 22, middle blocking plate; 23, left blocking plate; 201, blocking plate foot; 202, fixing bolts; 203, foot bolts. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0047] The present invention is described by taking a certain type of half-mouth-shaped structure as an example. Because of its complex structure, for the convenience of description, its structure is simplified and its simplified form is used as an example for description. Figures 1 to 3 As shown, it is defined as: half-mouth font.

[0048] See also Figures 1 to 3 The half-mouth font includes a top 11 used as a working surface, which is a plane in the completed state and is used to bear contact loads. It has been damaged during use, causing the top 11 to be non-plane, and the effective working thickness of the top is T; the bottom sides of the top 11 are provided with a shell 15 connected to the end of the top 11, and the top 11 and the shell 15 form a half-mouth font. The inner side of the half-mouth font is provided with a conformal rib 12 for strengthening fixation and support, and the conformal rib 12 is provided with a weight-reducing hole 13, which is also used as a bolt hole.

[0049] At the bottom of the half-mouth font, the bottom of the conformal rib 12 is flush with the bottom of the shell 15 and is on the same horizontal plane.

[0050] See also Figure 2At the top 11 of the half-mouth font, it can be easily seen that the top 11 is uneven, and the connection between the top 11 and the shell 15 is transitioned by a rounded corner, and the rounded corner radius is defined as R.

[0051] After the half-mouth font has been subjected to load for a long time, the top 11 is worn out and the effective thickness T is reduced, which makes it unable to meet the design requirements. If it is directly scrapped, it will cause waste of the main structure of the half-mouth font. Considering the structural characteristics of the half-mouth font, traditional repair methods such as casting and welding are not applicable. This seriously affects the service life of the structure, and the cost-effectiveness of the repair is relatively low.

[0052] To this end, the present invention proposes a half-mouth-shaped structure grafting printing method:

[0053] The half-mouth font with top wear is scanned using a 3D scanner to obtain its scanned model. Subsequently, the theoretical 3D model of the half-mouth font is imported using 3D scanning software and compared with the scanned model to find out the deviation between the top structure and the theoretical model. The difference X between the lowest point of the half-mouth font with top wear and the part of the theoretical model is calculated to obtain the wear value X.

[0054] Next, calculate the size of the transition radius R of the top and outer shell of the half-mouth font and the wear value X. If R>X, it is judged that the half-mouth font has less wear; if R<X, it is judged that the half-mouth font has greater wear. In principle, when using it, it should be ensured that the grafting is performed when the top wear amount R / 2<X<R to ensure the rationality and effectiveness of the subsequent grafting timing, thereby reducing the number of grafting times and increasing the single use time, which is more cost-effective.

[0055] According to the wear of the half-mouth font, the top worn part is removed using a CNC machining center. The removal amount α is α=R+0.5mm. The extra removal includes not only the worn part but also the transition area between the worn part and the intact part. This can avoid premature damage to the transition area during subsequent grafting. After removing a certain amount of α, the top becomes flat and flush with the bottom, which helps to ensure the effectiveness and flatness of the powder when using 3D printing grafting, and avoid the scraper from being unable to operate, such as Figure 4 The top is shown as a flat surface after a portion has been removed.

[0056] See also Figures 5 to 7 , and then place the half-mouth font on the substrate 20. It should be noted that the half-mouth font has no fixed clamping position and cannot be directly fixed on the substrate 20. Therefore, it is necessary to design necessary fixing tools. Figures 5 to 7 shown.

[0057] The substrate 20 is used as a stage for grafting half-mouth fonts. According to the structural characteristics of the half-mouth font, a right blocking plate 21 and a left blocking plate 23 fixedly connected to the conformal ribs 12 on both sides, and a middle blocking plate 22 fixedly connected to the internal conformal ribs 12 are respectively provided. By setting the right blocking plate 21 and the left blocking plate 23, the conformal ribs on the left and right sides of the half-mouth font are blocked, and the open state is changed to a closed state, which is consistent on the left and right. The middle blocking plate 22 is set in the middle part, so that the half-mouth font can be completely blocked in cooperation with the substrate 20. During the subsequent 3D printing grafting, the internal cavity part does not need to be filled with powder, which greatly saves the powder consumption. Especially for special materials or precious metals, the procurement cost of powder can be significantly reduced. At the same time, it is helpful to clean the powder after grafting, greatly reducing the time for powder cleaning and storage.

[0058] At the same time, the blocking plate can also serve as a reinforcement rib to enhance the strength of the half-mouth font and significantly reduce the shrinkage and deformation caused by thermal stress when the top of the half-mouth font is grafted.

[0059] Specifically, the right blocking plate 21 , the left blocking plate 23 and the middle blocking plate 22 are respectively provided with fixing holes, which can be fixedly connected to the conformal ribs 12 by fixing bolts.

[0060] The bottoms of the right blocking plate 21 , the left blocking plate 23 and the middle blocking plate 22 are respectively provided with blocking plate feet 201 , and the blocking plate feet 201 are provided with bolt holes, and the blocking plates can be fixed on the base plate 20 through the foot bolts 203 .

[0061] In this way, when the half-mouth font is 3D printed and grafted, the scraper movement cannot push the half-mouth font, thus maintaining the stability of the powder laying.

[0062] See also Figure 6 , you can clearly see the flatness of the top of the half-mouth font. When fixing the half-mouth font, first use the fixing bolts to fix the middle plugging plate 22 and the middle conformal rib 12, and then use the fixing bolts to fix the left and right plugging plates and the conformal ribs 12 on the left and right sides of the half-mouth font. Then place it on the base plate 20, and then use the fixing bolts to fix the bottom foot of the middle plugging plate 22 on the base plate 20 through the back of the base plate 20.

[0063] This method avoids the problem that the bolts of the middle blocking plate cannot be fixed after the blocking plates on the left and right sides are blocked. Finally, the feet of the blocking plates on the left and right sides are also fixed on the base plate using fixing bolts. In this way, the half-mouth font is firmly fixed on the base plate 20.

[0064] At this time, the half-mouth font, the blocking plate, and the base plate 20 form two large cavities A and B. The larger the size of the half-mouth font part, the larger the volume of the A and B cavities, the more powder is saved during 3D printing grafting, and the higher the cost-effectiveness.

[0065] Specific implementation method

[0066] 1. Place the fixed half-mouth font and the substrate 20 together and fix them on the 3D printing platform.

[0067] 2. Then, fill the 3D printing forming chamber with powder. Since there are two large cavities A and B in the above-mentioned half-mouth font, it is only necessary to fill the gap between the half-mouth font shell and the 3D printing forming cylinder with powder. This saves a lot of powder. At this time, the powder can be metal powder, or non-metallic, ceramic and other powders. Considering that conventional materials are generally metals, the present invention is described by taking metal materials as an example. The material of the metal powder is consistent with that of the half-mouth font, and can be aluminum alloy, titanium alloy, high-temperature alloy, stainless steel, iron-nickel alloy, etc. The present invention is described by taking TC4 titanium alloy as an example.

[0068] 2. After the TC4 metal powder is filled, use a metal scraper to compact the powder and fill any gaps. Then manually run the powder spreading scraper to spread the powder and flatten it. Adjust the lifting of the forming cylinder until a thin layer of metal powder is left on the top of the half-mouth font, with a powder thickness of 0 to 0.06 mm.

[0069] Then the forming chamber door is closed, the forming chamber is inflated, and the substrate heating is turned on.

[0070] 3. A part of the top of the half-mouth font is lost due to wear, and a part is removed by the mechanical processing mentioned above. In order to compensate for this part of the structure, a 3D model is constructed using 3D software such as UG. The length and width of the 3D model are consistent with the length and width of the top of the half-mouth font, but the shape is 0.2 to 0.5 mm larger. The extra part is used to compensate for the thermal deformation during the printing process. The height of the 3D model is greater than the part removed from the half-mouth font, and the height direction is 1 to 5 mm more. In this way, a 3D model that can completely envelop the removed part of the half-mouth font is constructed.

[0071] The coordinate system of the 3D model is exactly the same as that of the half-mouth font. It is then exported as a .stl file and named as a graft.

[0072] 4. Use 3D printing special process software, such as magics, to import the graft.stl. According to the position and coordinate system of the half-mouth font fixed on the substrate, adjust the coordinate system of the graft in the magics software to make them consistent. Then slice the graft according to the specific layer thickness d.

[0073] 5. Import the above slices into the 3D printing special process software and assign them specific forming parameters such as laser power, laser scanning speed, layer thickness, laser scanning spacing, etc. In this way, the grafting procedure of the half-mouth font is formed.

[0074] 6. Import the above program into the 3D printing equipment, and when the oxygen content in the forming chamber reaches a specific value and the temperature of the substrate reaches a specific temperature, the laser emits light for printing. When scanning the first layer, closely observe the laser scanning path and confirm that the scanning format is at the top of the half-mouth font.

[0075] After the laser sintering completes the current layer profile, the forming chamber drops to a specific layer thickness d, the scraper spreads the powder, and the laser sintering is repeated again. This cycle repeats until the grafting process is completely printed.

[0076] 7. Stop heating the substrate, and when the temperature of the substrate drops to room temperature, open the door of the laser selective melting equipment, remove the substrate, and take the grafted half-mouth font and the substrate out of the forming chamber of the 3D printing equipment.

[0077] 8. Clean the powder on the half-mouth font and substrate to ensure that the powder is cleaned up.

[0078] 9. Then, a vacuum heat treatment furnace is used to heat treat the half-mouth font together with the substrate. The purpose of heat treatment is to eliminate the stress at the grafting site and regulate the internal organization. The internal metallographic organization of the grafting site is basically consistent with that of the half-mouth font. In this way, the grafting site and the half-mouth font site can be prevented from being cracked and scrapped due to excessive stress caused by 3D printing, resulting in stress concentration. The metallographic organizations of the two can also be homogenized by heat treatment to reduce organizational stress. Heat treatment should be performed within 8 hours after the grafted body is printed.

[0079] 10. Then loosen the fixing bolts, remove the blocking plate and the half-mouth font from the base plate, and you can get the complete body blank after the half-mouth font is grafted. (The grafted body is larger than the missing part of the half-mouth font).

[0080] 11. Then use a 3D scanner to perform a 3D scan on the grafted half-mouth font to obtain its scanned model. Then use 3D scanning software to import the theoretical 3D model of the half-mouth font and compare it with the newly obtained scanned model. Confirm whether there is a missing amount. If there is a missing amount, graft it again using the steps described above.

[0081] 12. If there is no shortage, the half-mouth font grafting part is machined according to the half-mouth font theoretical three-dimensional model and two-dimensional drawing requirements. After the machining is completed, a brand new half-mouth font part is prepared. This greatly saves the cycle of re-manufacturing the half-mouth font, significantly reduces the cost, and has a very high cost-effectiveness.

[0082] The present invention provides a method for grafting and printing a half-mouth font structure, which has the following advantages: by installing a fixed tool on the half-mouth font, the tool includes a left plugging plate and a right plugging plate on the left and right sides, which are fixedly connected to the conformal ribs on both sides of the half-mouth font by fixing bolts respectively, and also includes a middle plugging plate, which is fixedly connected to the conformal ribs in the middle of the half-mouth font by fixing bolts. The bottoms of the left plugging plate, the right plugging plate and the middle plugging plate are provided with plugging plate feet, and the plugging plate feet are provided with bolt holes for fixed connection with the substrate. The conformal ribs on the right side of the half-mouth font are blocked from an open state to a closed state, so that the left and right sides are consistent, and there is also a blocking plate in the middle. In this way, the half-mouth font can be completely blocked by adding a substrate. In the subsequent 3D printing grafting process, the internal cavity does not need to be filled with powder, thereby greatly saving powder consumption, especially for special materials or precious metals, the procurement cost of powder can be significantly reduced. In addition, this design helps to clean up the powder after grafting, greatly reducing the time for powder cleaning and storage. Furthermore, the plugging plate can also serve as a reinforcing rib to enhance the strength of the half-mouth font and significantly reduce the shrinkage deformation caused by thermal stress when the top of the half-mouth font is grafted. This method effectively solves the technical problems of the half-mouth structure's working surface being easily damaged, difficult to repair, high cost, long cycle, and low pass rate.

[0083] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for printing a half-mouth-shaped structure grafting, characterized in that: A fixing tool is provided for fixing a half-mouth font to a base plate (20), the fixing tool comprising: a left blocking plate (23) and a right blocking plate (21) for respectively blocking the left and right sides of the half-mouth font, the left blocking plate (23) and the right blocking plate (21) being respectively fixedly connected to the conformal ribs (12) on both sides of the half-mouth font via fixing bolts (202); a middle blocking plate (22) is also provided, the middle blocking plate (22) being fixedly connected to the conformal ribs (12) in the middle of the half-mouth font via fixing bolts (202); blocking plate base feet (201) are provided at the bottom of the left blocking plate (23), the right blocking plate (21) and the middle blocking plate (22), the blocking plate base feet (201) being provided with bolt holes for being fixedly connected to the base plate (20).

2. The method for printing a half-mouth-shaped structure grafting according to claim 1, characterized in that: The fixing steps include: Step 1, fix the middle blocking plate (22) to the conformal rib (12) in the middle of the half-mouth font by means of fixing bolts (202); Step 2, fixing the left blocking plate (23), the right blocking plate (21) and the conformal ribs (12) on the left and right sides of the half-mouth font by fixing bolts (202); Step 3, placing the structure formed by the fixed assembly on the base plate (20), and fixing the blocking plate foot (201) of the middle blocking plate (22) on the base plate (20) through the back side of the base plate (20) using the base bolts (203); Step 4, using foot bolts (203) to fix the blocking plate feet (201) of the left blocking plate (23) and the right blocking plate (21) on the base plate (20).

3. The half-mouth-shaped structure grafting printing method according to claim 2 is characterized in that: The steps include: Step S1, fixing the fixed half-mouth font and the substrate (20) on a 3D printing platform; Step S2, filling metal powder into the 3D printing forming chamber to fill the gap between the half-mouth font shell (15) and the forming cylinder body; Step S3, using a metal spatula to compact and fill powder gaps; Step S4, manually operating the powder spreading scraper to spread the powder and adjust the lifting of the forming cylinder until a layer of metal powder with a predetermined thickness is left on the top of the half-mouth font (11); Step S5, closing the forming cabin door and inflating the forming cabin; Step S6, starting substrate heating; Step S7, using 3D software to construct a 3D model that compensates for the thermal deformation of the top of the half-mouth font (11), and importing and adjusting the graft body 3D model to ensure consistency with the half-mouth font; Step S8, slicing the graft, and importing the slices into 3D printing software to set forming parameters; Step S9, printing the graft in a 3D printing device, stopping heating after printing is completed, opening the forming cabin door and removing the substrate (20); Step S10, cleaning the powder on the half-mouth font and the substrate (20); Step S11, placing the half-mouth font and the substrate (20) into a vacuum heat treatment furnace for heat treatment to eliminate stress; Step S12, using a 3D scanner to scan the grafted half-mouth font, and importing the scanned model into a 3D scanning software to compare it with the theoretical model; Step S13, if there are defects, repair and scan again; If there are no defects, the grafted parts are machined to prepare a complete half-mouth font part.

4. The half-mouth-shaped structure grafting printing method according to claim 3 is characterized in that: The height of the three-dimensional model is 1 to 5 mm greater than the height of the portion where the half-font is removed.

5. The half-mouth-shaped structure grafting printing method according to claim 3 is characterized in that: The shape of the grafted body is 0.2 to 0.5 mm larger than the half-mouth font removal part to compensate for thermal deformation during printing.

6. The half-mouth-shaped structure grafting printing method according to claim 3 is characterized in that: In step S11, the vacuum heat treatment furnace is performed within 8 hours after the graft is printed.

7. The half-mouth-shaped structure grafting printing method according to claim 3 is characterized in that: In step S4, the predetermined thickness is 0 to 0.06 mm.

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