A method for machining parts based on embedded immersion 3D printing

Abstract

This invention provides a 3D printing part processing method based on powder materials and liquid binders to construct printed entities. In this method, the printing nozzle is embedded to a certain depth below the plane of the powder bed during the 3D printing process, extruding the liquid binder. The moving printing nozzle forms channels of a certain depth and width on the surface of the powder bed, and simultaneously, a large flow of liquid binder instantly fills the dynamic channels. Subsequently, the liquid binder permeates, diffuses, and solidifies in a controlled and constrained state to form the printed entity. This method combines the advantages of extrusion printing and powder bed structure, solving the requirements of single extrusion printing on the formability of the extruded material. It achieves controllable printing of shapes and precision for high-flow, high-viscosity, and large-layer-thickness printing. This method is applicable to a wide variety of binder materials and a large range of powder bed materials and sizes, meeting the needs of rapid prototyping of parts with wide material applicability, large forming sizes, and high part strength.

Description

Technical Field

[0001] This invention belongs to the field of additive manufacturing and relates to a part processing method based on embedded immersion 3D printing. Background Technology

[0002] 3D printing technology, also known as additive manufacturing technology, refers to the manufacturing process of building three-dimensional objects by adding a series of thin sheets of cross-sectional shapes layer by layer.

[0003] Traditional 3D printing methods that build physical entities based on powder materials and liquid binders primarily employ material jetting and liquid binder jetting techniques. To meet high precision requirements, both methods limit the nozzle diameter. If the nozzle diameter is too large, problems arise such as difficulty controlling the liquid's trajectory or powder splattering due to gravity. This nozzle diameter limitation further restricts the size of the formed parts. Consequently, when rapid prototyping of large parts is required, using a small-diameter nozzle fails to achieve the desired speed, while using a large-diameter nozzle cannot avoid the problems of uncontrollable liquid trajectory and powder splattering, thus compromising the accuracy of the binder layer.

[0004] Currently, 3D printing methods based on powder materials and liquid binders to construct printed entities still have drawbacks such as low binder precision when printing large-sized parts, slow forming speed when printing large-sized parts, and limited types of available powder materials, making it difficult to achieve a balance between efficiency, size, and precision. Summary of the Invention

[0005] To address the problems of existing technologies, the present invention aims to provide an embedded immersion 3D printing method that enables rapid, large-size prototyping using powder materials, with a wider selection of powder materials. In this invention, the print head penetrates to a specific depth below the printing plane during operation, extruding a liquid binder in the process. As the print head moves, it creates channels of defined depth and width within the powder material, simultaneously filling these dynamically formed channels with a high flow rate of liquid binder. Subsequently, the liquid binder permeates, diffuses, and ultimately solidifies under controlled conditions, forming the solid structure of the printed object. This method is not limited to using a single powder material; toughening agents, reinforcing agents, and other materials can be added to improve the performance of the formed part. Furthermore, reinforcing materials can be added to the liquid binder to enhance the performance and printing accuracy of the formed part.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A method for fabricating 3D printed parts based on the extrusion of powder materials and liquid binders is disclosed. In this method, the printing nozzle is embedded to a certain depth below the printing plane during the 3D printing process, extruding the liquid binder. The moving printing nozzle forms channels of a certain depth and width on the surface of the powder material. Simultaneously, a large flow rate of liquid binder instantly fills these dynamic channels. Subsequently, the liquid binder permeates, diffuses, and solidifies in a controlled and constrained state to form the printed entity. This method combines the advantages of extrusion printing and powder material printing, meeting the requirements of single extrusion printing for the formability of the extruded material. It achieves controllable printing of shapes and precision for high-flow, high-viscosity, and large-layer-thickness printing. This method is applicable to a wide variety of binder materials and a broad range of powder bed materials and sizes, meeting the rapid prototyping needs of parts with wide material applicability, large forming sizes, and high strength. The specific steps include:

[0008] Step (1): Create a three-dimensional model of the object to be printed. Import the created three-dimensional model of the object into the 3D printing slicing software to set the parameters. After setting the parameters, the slicing software will automatically slice the three-dimensional model of the object and obtain the printing data of the object that the printer can use.

[0009] Step (2) involves loading the print data of the target object from step (1) into the printer's control system and starting layer-by-layer printing, specifically:

[0010] First, the lifting mechanism 1 at the bottom of the printer moves upward as described in step (1). When the lifting mechanism 1 contacts the bottom surface 2 of the toner cartridge, an electromagnet locks them together, allowing them to rise and fall together. The lifting mechanism 1 continues to rise, raising the bottom surface 2 of the toner cartridge 4 to a position aligned with the printing plane 3, and then lowers by the thickness of that printing layer. At this time, the powder material 6 is loaded into the powder spreading device 5 and is waiting to be spread. The toner cartridge 4 is empty, and the bottom surface 2 of the toner cartridge is lower than the thickness of that printing layer on the printing plane 3. Next, the toner spreading device 5 of the printer spreads powder on the printing plane 3 and smooths the powder material 6 according to the toner spreading action of the toner spreading device 5 obtained in step (1) and the toner spreading thickness during the printing of the layer. The toner spreading action of the toner spreading device 5 is bidirectional reciprocating, that is, during each layer printing, the toner spreading device 5 only moves in one direction once to complete the toner spreading action. Then the toner spreading device stops on one side of the printer. When starting to spread the powder for the next layer, it moves from one side to the other side, and so on. During the toner spreading process, the heating plate on the toner spreading device 5 will start to heat the area below, and adjust the process parameters such as the penetration rate, fluidity, reactivity and viscosity of the liquid binder 8.

[0011] Then, the print head 7 of the embedded printer begins to move to the starting position of the layer pattern according to the moving trajectory of the print head 7 obtained in step (1). Then, according to the embedding depth set in step (1), the print head 7 is embedded below the printing plane 3 and moves to expel the liquid binder 8 from the print head 7. The moving print head 7 forms a water channel 10 of a certain depth and width on the surface of the powder material 6. Simultaneously, a large flow of liquid binder 8 immediately fills the dynamic water channel 10. After that, the liquid binder penetrates and diffuses in a controlled and constrained state.

[0012] Step (3) repeats step (2) to obtain an in-situ impregnation layer. The liquid binder 8 has been extruded, but the natural impregnation behavior has not been completed. As the print head 7 moves, the penetration degree of the area where the liquid binder 8 is extruded first is greater than that of the area where the liquid binder 8 is extruded later.

[0013] Step (4) repeats step (2) to obtain an interlayer bonding layer. The liquid adhesive 8 has been extruded and the natural impregnation behavior has exceeded the thickness of a printed layer and begins to bond with the previous layer. As the print head 7 moves, the place where the liquid adhesive 8 is extruded first bonds with the in-situ impregnation layer first, while the place where the liquid adhesive 8 is extruded later has not yet begun to bond with the in-situ impregnation layer.

[0014] Step (5) repeats step (2) to obtain a fully impregnated layer in which the liquid binder 8 has been extruded, the natural impregnation behavior has been completed and it has been fully bonded to the interlayer bonding layer, but the time for the crosslinking reaction has not been reached.

[0015] Step (6), repeat step (2), as printing progresses, the liquid binder gradually solidifies to obtain a semi-cured layer. The liquid binder 8 has been completely extruded, the natural impregnation behavior has been completed and it has been fully bonded to the interlayer bonding layer. However, the matrix material and the curing agent have only undergone limited cross-linking reaction. As the printing nozzle 8 moves, the degree of cross-linking reaction is greater where the liquid binder 8 is extruded first than where the liquid binder 8 is extruded later.

[0016] Step (7) repeats step (2) to obtain a fully cured layer, which has completed the cross-linking reaction between the matrix material and the curing agent, thus achieving curing.

[0017] Step (8) is repeated in step (2) until printing is complete. After printing is complete, the powder bed box 4 is left to stand for a period of time to allow the liquid binder 8 to cure, thereby obtaining a printed part with a certain mechanical strength.

[0018] Step (9) involves heating the printed part obtained in step (8) to obtain a printed part with enhanced mechanical strength. Then, the printed part is precision machined to obtain the final target object.

[0019] Furthermore, one of the key parameters in step (1) is called the embedment depth. During the printing process of the target object, the print head 7 is embedded below the printing plane 3. This parameter refers to the distance from the lowest point of the print head 7 to the printing plane 3, with the printing plane 3 as the reference plane.

[0020] Furthermore, the printing data of the target object obtained in step (1) includes: the moving trajectory of the print head 7, the powder spreading action of the powder spreading device 5, the powder spreading thickness during each layer printing, and the lifting action of the elevator 1. Among them, the height of the elevator 1 when it descends each time is the printing layer thickness of that layer.

[0021] Furthermore, the toner cartridge 4 described in step (2) is a cuboid without a top cover. The four sides of the toner cartridge 4 are mechanically locked to the printer, allowing for installation and removal at the start and end of printing. The bottom surface 2 of the toner cartridge is a rectangular aluminum plate that can move up and down. During printing, it is locked to the lifting mechanism 1 via an electromagnet, achieving a coordinated lifting effect. The entire printing process of the target object also takes place on the bottom surface 2 of the toner cartridge.

[0022] Furthermore, in step (2), the printing plane 3 is a flat aluminum plate with a rectangular cutout in the middle. The shape of the rectangle is the same as the shape of the bottom surface 2 of the powder bed box. Therefore, when the bottom surface 2 of the powder bed box rises to align with the printing plane 3, the cutouts in the bottom surface 2 and the printing plane 3 complement each other, forming a complete plane. When the bottom surface 2 of the powder bed box descends by the thickness of the printing layer, the powder bed box 4 and the printing plane 3 will form a U-shape. At this time, the powder material 6 spread by the powder spreading device 5 will fall onto the bottom surface 2 of the powder bed box, while the remaining powder material 6 that falls onto the printing plane 3 will be scraped into the recycling device.

[0023] Furthermore, the powder spreading device 5 mentioned in step 2 consists of three parts: a powder spreading frame, a powder box, and a heating plate. The powder spreading frame is fixed on the printer and moves with the printer. The powder box is fixed on the powder spreading frame. When using the printer, different shaped powder boxes can be replaced according to different process requirements. The heating plate 21 is also fixed on the powder spreading frame. When the powder spreading device 5 spreads powder, the heating plate 21 will be activated and heat the powder material 6 being spread.

[0024] Furthermore, the powder material 6 used in the embedded printer in step (2) is suitable for a variety of materials. The types of powder material 6 include metal powder materials, polymer powder materials, ceramic powder materials, polymer coated powder materials, mixed powder materials and various solid powder particles. Short fibers can also be added to the powder material 6 as reinforcing materials.

[0025] Furthermore, during the printing process of the target layer in step (2), when the print head 7 moves below the printing plane 3, it will push the powder material 6 to both sides to accumulate into a powder material pile 9, forming a channel 10 with a width equal to the diameter of the print head 7. This channel 10 is the impregnation track of the liquid binder 8. The print head 7 has a wide range of diameter options, which also allows the width of the formed channel 10 to meet the needs of various applications.

[0026] Furthermore, in step (2), the liquid binder 8 is formed by mixing the matrix material of the liquid binder 8 with a curing agent. The mixture of the two will produce a cross-linking reaction, thereby achieving curing at room temperature. Natural impregnation refers to in-situ impregnation, that is, taking the position where the liquid binder 8 is sprayed from the print head 7 as the origin, the liquid binder 8 gradually diffuses to the surroundings and fills the gaps between the powder materials 6. The matrix includes thermosetting polymer materials such as epoxy resin and polyurethane; the curing agent includes general-purpose epoxy resin curing agents, etc.; the mass ratio of the matrix material and the curing material is obtained by mixing according to the actual printing process parameters.

[0027] Furthermore, the finishing process in step (9) refers to using a CNC machine tool to finish the printed part obtained in step (8) based on the three-dimensional model of the target object drawn in step (1), removing excess material from the surface, and obtaining an accurate target object model entity.

[0028] The beneficial effects of this invention are:

[0029] (1) This invention proposes an extrusion-embedded immersion 3D printing method. By adopting embedded printing technology, the precise distribution of liquid binder is ensured, which solves the problem of insufficient accuracy of the adhesive layer due to the lack of immersion track in the traditional immersion process. This method is not limited to a single type of powder material. It supports the use of multiple materials and can also add reinforcing materials, thereby expanding the range of printable materials. The strategy of using powder material bonding printing and natural immersion molding to complete the roughing process meets the needs of large-format molding. The introduction of post-processing method, which heats the bonding and molding area as a whole to remove residual stress, improves the stability of the performance of the molded part.

[0030] (2) The printing process provided by the present invention makes it easy to print powder materials. Combined with thermosetting and finishing, it can obtain large-size molded parts with higher precision, achieving the effect of balancing efficiency, size and precision.

[0031] In summary, this invention enables 3D printing of multiple materials, large sizes, high strength, and rapid prototyping. Attached Figure Description

[0032] Figure 1This is a cross-sectional view of the extrusion-embedded 3D printing process. 1 is the elevator, 2 is the bottom surface of the powder bed box, 3 is the printing plane, 4 is the powder bed box, 5 is the powder spreading device, 6 is the powder material used for printing, 7 is the printing nozzle, 8 is the liquid binder used for printing, 9 is the powder material pile pushed aside by the printing nozzle, 10 is the water channel formed by the powder material pile, 11 is the interlayer bonding state where the liquid binder layer has been extruded but the natural impregnation process is incomplete, 12 is the interlayer bonding state where the liquid binder layer has been extruded and the natural impregnation process is complete, but the interlayer bonding with the previous layer has just begun, 13 is the... The liquid adhesive layer has been extruded, natural impregnation has been completed, and interlayer bonding with the previous layer has been completed, but the layer has not yet cured. 14 represents the interlayer bonding state where the liquid adhesive layer has been extruded, natural impregnation has been completed, and interlayer bonding with the previous layer has been completed, and the layer has been cured, but not yet cured. 15 represents the first printed layer, 16 represents the second printed layer, 17 represents the third printed layer, 18 represents the fourth printed layer, 19 represents the fifth printed layer, 20 represents the sixth printed layer, 21 represents the activated heating plate, and 22 represents the deactivated heating plate.

[0033] Figure 2 This is a cross-sectional view of the L-shaped model.

[0034] Figure 3 It is a three-dimensional model in the shape of an L.

[0035] Figure 4 This is a plan view of the layer after printing. Detailed Implementation

[0036] This invention provides a 3D printing method using wood flour and thermosetting epoxy resin as printing materials. During the printing process, the printing nozzle 7 is embedded below the printing plane 3. Through extrusion, impregnation, and curing, a bonding layer with the same shape as the model is obtained. This layer-by-layer printing achieves additive manufacturing, and the resulting model is then precision-machined using a lathe. This invention solves the problem of low bonding layer accuracy caused by the lack of impregnation tracks in previous impregnation processes. The specific implementation scheme is as follows:

[0037] (1) As Figure 3 The process involves creating a 3D model of the L-shaped object to be printed. This model is then imported into 3D printing slicing software for parameter settings. The embedding depth is set to half the thickness of each printing layer, while the remaining parameters remain at their default values. After setting the parameters, the slicing software automatically slices the L-shaped 3D model into 25 layers, each 1cm thick, and generates a G-code file of the L-shaped object suitable for the printer.

[0038] (2) Load the L-shaped G-code file from step (1) into the control system of the printer with a printhead 7 diameter of 2cm, and start printing layer by layer, specifically:

[0039] First, the printer's lifting mechanism 1 moves upward according to the G-code file obtained in step (1). When the lifting mechanism 1 contacts the bottom surface 2 of the toner cartridge, an electromagnet locks them together, allowing them to rise and fall together. The lifting mechanism 1 continues to rise, raising the bottom surface 2 of the toner cartridge to a position aligned with the printing plane 3, and then lowers it by 1cm. At this point, the toner cartridge 4 is empty, and the bottom surface 2 of the toner cartridge is 1cm below the printing plane. Next, the printer's toner spreading device 5 spreads toner on the printing plane 3 and smooths out the wood powder 6 according to the G-code file obtained in step (1). The toner spreading device 5 spreads toner from left to right, and the height of the wood powder 6 spread on the bottom surface 2 of the toner cartridge is 1cm. At the same time, the heating plate 21 on the left side of the toner spreading device is activated, and the heating plate 22 on the right side is deactivated.

[0040] Then, the print head 7 of the embedded printer begins to move to the starting position of the first layer of the L-shape, based on the G-code file obtained in step (1). Then, according to half the layer thickness set in step (1), i.e., 5mm, the print head 7 is embedded 5mm below the printing plane 3 and moves, extruding thermosetting epoxy resin 8 from the print head 7. The moving print head 7 forms a channel 10 of a certain depth and width on the surface of the wood powder 6. Simultaneously, a large flow of thermosetting epoxy resin 8 immediately fills the dynamic channel 10. Afterward, the thermosetting epoxy resin penetrates and diffuses in a controlled and constrained state, and gradually solidifies at room temperature, completing the printing of this layer. The thermosetting epoxy resin 8 is then extruded from the print head 7. When the print head 7 moves below the printing plane 3, it pushes the wood powder 6 to both sides to accumulate into a wood powder pile 9, forming a channel 10 with a width equal to the diameter of the print head 7. The thermosetting epoxy resin 8 extruded from the print head 7 flows into the L-shaped channel 10 formed when the print head 7 moves in the wood powder 6, and naturally impregnates from the L-shaped channel 10, enters the gaps of the wood powder 6 and encapsulates the wood powder 6, while gradually solidifying at room temperature, and the printing of this layer is completed.

[0041] (3) Repeat step 2 to complete the printing of one layer of the L-shaped model. Then print layer by layer. When printing the seventh layer, the powder bed box 4 contains a total of Figure 1The interlayer states shown are as follows: the first layer 15 is a fully cured layer, in which the thermosetting epoxy resin 8 has been extruded, natural impregnation has been completed, and interlayer bonding with the previous layer has been completed; this layer is fully cured. The second layer 16 is a semi-cured layer, in which the thermosetting epoxy resin 8 has been extruded, natural impregnation has been completed, and interlayer bonding with the previous layer has been completed; this layer is cured, but not yet fully cured. The third layer 17 is a fully impregnated layer, in which the thermosetting epoxy resin 8 has been extruded, and natural impregnation has been completed. The first layer 13 is an interlayer bonding layer, where the thermosetting epoxy resin 8 has been extruded and natural impregnation has been completed, but it has just begun to bond with the previous layer 12; the second layer 19 is an in-situ impregnation layer, where the thermosetting epoxy resin 8 has been extruded, but natural impregnation has not been completed 11; the third layer 20 is a printing layer, where the thermosetting epoxy resin 8 is being extruded; printing continues until the last layer is printed, and the printing work ends.

[0042] (4) After printing, let the powder bed box 4 stand for a period of time and wait for the liquid binder 8 to complete curing to obtain a printed part with a certain mechanical strength. Unload the powder bed box 4 from the printer. According to the process characteristics of wood powder and thermosetting epoxy resin, heat the powder bed box 4 and the wood powder inside the powder bed box 4 at 135 degrees Celsius for 120 minutes to obtain an L-shaped printed part with enhanced mechanical strength.

[0043] (5) The L-shaped printed part is placed in the machine tool for installation. (1) The three-dimensional model of the L-shaped part is finely processed to finally obtain the L-shaped model.

[0044] The above-described embodiments are merely illustrative of the implementation methods of the present invention, but should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the protection scope of the present invention.

Claims

1. A method for machining parts based on embedded immersion 3D printing, characterized in that, The part processing method described above involves embedding the printing nozzle below the printing plane during the 3D printing process and extruding liquid binder. The moving printing nozzle forms dynamic channels of a certain depth and width on the surface of the powder material, and the liquid binder immediately fills the dynamic channels to form a printed entity. The part processing method includes the following steps: Step (1): Create a three-dimensional model of the object to be printed and obtain the printing data of the object; the printing data includes: the moving trajectory of the printing nozzle (7), the powder spreading action of the powder spreading device (5), the powder spreading thickness during each printing layer and the lifting action of the elevator (1); wherein, in the lifting action of the elevator (1), the height of each drop of the elevator (1) is the printing layer thickness of that layer. Step (2): The printing data of the target object obtained in step (1) is used to start printing layer by layer, specifically: First, the lifting mechanism (1) at the bottom of the printer moves upward as obtained in step (1). When the lifting mechanism (1) contacts the bottom surface (2) of the powder bed box, the two are locked by an electromagnet so that they can rise and fall together. The lifting mechanism (1) continues to rise and raises the bottom surface (2) of the powder bed box (4) to a position aligned with the printing plane (3), and then lowers by the thickness of the printing layer. At this time, the powder material (6) is loaded in the powder spreading device (5) and is waiting to be spread. The powder bed box (4) is empty, and the bottom surface (2) of the powder bed box is lower than the thickness of the printing plane (3). Secondly, the powder spreading device (5) of the printer spreads powder on the printing plane (3) and scrapes the powder material (6) flat according to the powder spreading action in step (1) and the powder spreading thickness when printing the layer. The powder spreading action of the powder spreading device (5) is bidirectional reciprocating powder spreading. Finally, the print head (7) of the embedded printer begins to move to the starting position of the layer pattern according to the moving trajectory of the print head (7) obtained in step (1), and then moves the print head (7) below the printing plane (3) according to the embedding depth set in step (1), and squeezes out liquid binder (8) from the print head (7). The moving print head (7) forms a dynamic channel (10) on the surface of the powder material (6), and the liquid binder (8) immediately fills the dynamic channel (10). After that, the liquid binder penetrates and diffuses in a controlled and constrained state to form a printed entity. Step (3) repeats step (2) to obtain an in-situ impregnation layer. The liquid binder (8) in this layer has been extruded, but the natural impregnation behavior has not been completed. As the print head (7) moves, the area where the liquid binder (8) is extruded first has a greater penetration degree than the area where the liquid binder (8) is extruded later. Step (4), repeat step (2) to obtain the interlayer bonding layer. The liquid adhesive (8) in this layer has been completely extruded and the natural impregnation behavior has exceeded one printing layer thickness and started to bond with the previous layer. As the printing nozzle (7) moves, the area where the liquid adhesive (8) is extruded first will bond with the in-situ impregnation layer first, while the area where the liquid adhesive (8) is extruded later has not yet started to bond with the in-situ impregnation layer. Step (5), repeat step (2) to obtain a fully impregnated layer, in which the liquid binder (8) has been extruded, the natural impregnation behavior has been completed and it has been fully bonded to the interlayer bonding layer, but the time for the cross-linking reaction has not been reached. Step (6), repeat step (2), as printing progresses, the liquid binder gradually solidifies to obtain a semi-cured layer. The liquid binder (8) in this layer has been completely extruded, the natural impregnation behavior has been completed and it has been completely bonded to the interlayer bonding layer. As the printing nozzle (7) moves, the cross-linking reaction degree of the area where the liquid binder (8) is extruded first is greater than that of the area where the liquid binder (8) is extruded later. Step (7) repeats step (2) to obtain a fully cured layer, which has completed the cross-linking reaction between the matrix material and the curing agent, thus achieving curing; Step (8) repeats step (2) until printing is complete; after printing is complete, the powder bed box (4) is left to stand until the liquid binder (8) is cured to obtain a printed part with a certain mechanical strength; Step (9) involves heating the printed part obtained in step (8) to obtain a printed part with enhanced mechanical strength, and then performing a finishing process on the printed part to obtain the final target object.

2. The part processing method based on embedded immersion 3D printing according to claim 1, characterized in that, The specific steps (1) are as follows: Create a three-dimensional model of the object to be printed, import the created three-dimensional model of the object into the 3D printing slicing software for parameter setting. After setting the parameters, the slicing software automatically slices the three-dimensional model of the object and obtains the printing data of the object that can be used by the printer. The key parameter in the parameter setting is the embedment depth. The embedment depth refers to the distance from the lowest point of the printing nozzle (7) to the printing plane (3) with the printing plane (3) as the reference plane.

3. A method for machining parts based on embedded immersion 3D printing according to claim 1, characterized in that, The bidirectional reciprocating powder spreading in step (2) is as follows: during each layer of printing, the powder spreading device (5) moves only once in one direction to complete the powder spreading action. Then the powder spreading device (5) stops on one side of the printer. When starting the next layer of powder spreading, it moves from one side to the other side, and so on. During the powder spreading process, the heating plate on the powder spreading device (5) heats the area below.

4. A method for machining parts based on embedded immersion 3D printing according to claim 1, characterized in that, In step (2) as described above: The powder bed box (4) is a cuboid without a top cover. The four sides of the powder bed box (4) are mechanically locked to the printer. The bottom surface (2) of the powder bed box is an aluminum plate that can move up and down. During the printing process, it is locked to the elevator (1) by an electromagnet to achieve the effect of lifting together. The entire printing process of the target object is completed on the bottom surface (2) of the powder bed box.

5. A method for machining parts based on embedded immersion 3D printing according to claim 1, characterized in that, In step (2) as described above: The printing plane (3) is a hollow aluminum plate with the same shape as the bottom surface (2) of the powder bed box. When the bottom surface (2) of the powder bed box rises to align with the printing plane (3), the bottom surface (2) of the powder bed box and the hollow position of the printing plane (3) form a complete plane. When the bottom surface (2) of the powder bed box drops by the thickness of the printing layer, the powder material (6) spread by the powder spreading device (5) falls onto the bottom surface (2) of the powder bed box, and the powder material (6) that falls onto the printing plane (3) is scraped into the recycling device.

6. A method for machining parts based on embedded immersion 3D printing according to claim 1, characterized in that, The powder spreading device (5) in step (2) consists of three parts: a powder spreading frame, a powder loading box, and a heating plate.

7. A method for machining parts based on embedded immersion 3D printing according to claim 1, characterized in that, The powder material (6) includes metal powder material, polymer powder material, ceramic powder material, polymer coated powder material, mixed powder material and various solid powder particles; short fibers are added to the powder material (6) as reinforcing materials.

8. A method for machining parts based on embedded immersion 3D printing according to claim 1, characterized in that, The liquid adhesive (8) is a mixture of a matrix material and a curing agent.

9. A method for machining parts based on embedded immersion 3D printing according to claim 8, characterized in that, The matrix includes epoxy resin, polyurethane, or other thermosetting polymer materials; the curing agent includes general-purpose epoxy resin curing agents.

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