Liquid silica gel 3D printing rapid forming device and forming method

Abstract

The invention provides a liquid silica gel 3D printing rapid forming device and method. The liquid silica gel 3D printing rapid forming device comprises a forming shell, the forming shell comprises a shell body, a forming cavity is formed in the shell body, an injection port is formed in one end of the shell body, a plurality of exhaust columns are arranged at the end, away from the injection port, of the shell body, and an exhaust hole used for exhausting is formed in each exhaust column; and the injection mechanism is connected with the injection port and is used for injecting the liquid silica gel into the molding cavity so as to be cured into the silica gel product. Designing a three-dimensional structure model and an injection port of the silica gel product molding shell by using computer-aided software; simulating the flowing state of the liquid silica gel in the formed shell by utilizing simulation software; the position of the exhaust hole is designed according to the simulated flowing state of the liquid silica gel in the formed shell; the 3D printer is started to print the formed shell, and the printed formed shell is subjected to aftertreatment; liquid silica gel is injected into the molded shell through the injection mechanism, and the molded shell is damaged after curing, so that a quick and low-cost silica gel product can be obtained.

Description

Technical Field

[0001] The invention relates to a liquid silicone 3D printing rapid prototyping device and a prototyping method, which are used in the technical field of silicone prototyping. Background Art

[0002] Liquid silicone has excellent tear resistance, resilience, anti-yellowing, thermal stability, heat resistance and anti-aging. In the medical, electronic, mechanical, sanitary and other industries, silicone parts are increasingly widely used. The production of liquid silicone parts mainly adopts injection molding process, which can produce parts with complex structure and high precision requirements. At present, if silicone parts are needed in the product development stage, molds can only be opened for molding. The high mold manufacturing cost and the mold manufacturing time of several weeks not only increase the R&D cost and risk of the enterprise, but also affect the progress of the enterprise's new product development. Therefore, from the perspective of cost risk, in most cases, industrial enterprises such as electronics, machinery, and sanitary can only choose vacuum casting method and use polyurethane rubber materials to make rapid prototypes. In the medical and food industries, the demand for silicone parts cannot be replaced by polyurethane rubber, because these industries have certain requirements for the safety of silicone parts to materials, so only expensive mold injection molding can be selected. In view of the above problems, the present invention designs a liquid silicone 3D printing rapid prototyping device and molding method to effectively reduce the mold manufacturing cost. Summary of the invention

[0003] The present invention provides a liquid silicone 3D printing rapid prototyping device and a prototyping method to effectively solve the above problems.

[0004] The present invention is achieved in that: A liquid silicone 3D printing rapid prototyping device, comprising: A molding shell, comprising a shell body, wherein the shell body has a molding cavity, an injection port is arranged at one end of the shell body, and a plurality of exhaust columns are arranged at one end of the shell body away from the injection port, wherein an exhaust hole for exhausting gas is arranged in the exhaust column; The injection mechanism is connected to the injection port and is used to inject liquid silicone into the molding cavity, and then solidify it to form a silicone product.

[0005] As a further improvement, the exhaust hole comprises a first section of exhaust holes close to one end of the molding cavity and a second section of exhaust holes connected to the first section of exhaust holes, the first section of exhaust holes is circular in shape, and the overall length of the exhaust column is defined as , the length of the first exhaust hole is , then the length of the first exhaust hole The overall length of the exhaust column 1 / 3~2 / 5 of it.

[0006] As a further improvement, the second section of the exhaust holes is shaped like a water drop, and the second section of the exhaust holes is drafted outward at an angle of α° on the first section of the exhaust holes, and the draft angle α=1~2.5°.

[0007] As a further improvement, the thickness of the molded shell is 0.5-1.5 mm, and the thickness of the molded shell is proportional to the size of the molded shell.

[0008] A liquid silicone 3D printing rapid prototyping method comprises the following steps: Use computer-aided software to design the three-dimensional structural model and injection port of the silicone product molding shell; Use simulation software to simulate the flow state of liquid silicone in the molded shell; The position of the exhaust hole is designed according to the simulated flow state of the liquid silicone in the molded shell; Start the 3D printer to print the molded shell, and post-process the printed molded shell; Liquid silicone is injected into the molded shell through an injection mechanism, and the molded shell is destroyed after solidification to obtain a silicone product.

[0009] As a further improvement, designing the position of the vent hole according to the simulated flow state of the liquid silicone in the molded shell further includes arranging the position of the vent hole at the end of the material flow path or at the position where two material flows converge.

[0010] As a further improvement, starting the 3D printer to print and form the shell includes using a material jetting light-curing 3D printer for printing and forming. The 3D printer is equipped with a piezoelectric print head, which has two material cylinders, one of which is used to place a main material for making the molded shell, and the other material cylinder is used to place a low-melting-point wax material for printing a support structure of the molded shell. The print head controls the material to be ejected in the form of droplets through a pulse signal, and then solidifies and forms the material through ultraviolet light irradiation on the print head, and completes the printing of the molded shell layer by layer. After printing is completed, the low-melting-point wax material on the outside of the shell is melted and separated by heating, and the low-melting-point wax material inside the shell will melt into liquid and be discharged from the injection port and the exhaust hole, thereby obtaining a thin-walled hollow molded shell for liquid silicone molding.

[0011] As a further improvement, the main material of the 3D printer consists of oligomers, diluents, curing reactants, and photoinitiators.

[0012] As a further improvement, a proper amount of platinum curing agent is added to the liquid silicone material.

[0013] The beneficial effects of the present invention are: The three-dimensional structure of the silicone product is designed by computer-aided software, and then printed out by 3D printing technology. After post-processing, a mold for liquid silicone curing molding is manufactured. Finally, the liquid silicone is injected into the molded shell by an injection mechanism. After a certain period of curing and shaping, the molded shell is destroyed to obtain a silicone product. Compared with the traditional silicone mold design, the silicone product obtained by this method can effectively reduce the high mold manufacturing cost and the long mold manufacturing cycle, and obtain a fast and low-cost silicone product. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the structure of a molding device provided in an embodiment of the present invention.

[0016] Figure 2 It is a schematic diagram of the top view structure of the forming device provided in an embodiment of the present invention.

[0017] Figure 3 yes Figure 1 Schematic diagram of the enlarged structure at point A in the middle.

[0018] Figure 4 It is a schematic structural diagram of a molding device provided in another embodiment of the present invention.

[0019] Figure 5 It is a schematic diagram of the three-dimensional structure of a silicone product provided by another embodiment of the present invention.

[0020] Figure 6 The embodiment of the present invention provides a flow state diagram simulated by using simulation software.

[0021] Figure 7 Another embodiment of the present invention provides a flow state diagram simulated by simulation software.

[0022] Figure 8 A schematic diagram of a high-temperature melting support process provided by an embodiment of the present invention.

[0023] Fig. 9 This is a schematic diagram of taking out a silicone product after injection molding provided by an embodiment of the present invention.

[0024] Fig.10 It is a physical picture with bubbles provided in an embodiment of the present invention.

[0025] Fig.11 This is a real picture without bubbles provided by an embodiment of the present invention.

[0026] The accompanying drawings are marked as follows: 10. Molding shell; 11. Shell body; 111. Molding cavity; 12. Injection port; 121. Connecting port; 13. Exhaust column; 14. Exhaust hole; 141. First-stage exhaust hole; 142. Second-stage exhaust hole; 15. Connecting column; 151. Spherical connecting part; 20. Injection mechanism. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0029] The present invention relates to a liquid silicone 3D printing rapid prototyping method, comprising the following steps: Reference Figure 1~Figure 5 As shown, a three-dimensional structural model of a silicone product molding shell 10 and an injection port 12 are designed using computer-aided software. The computer-aided software includes Pro / ENGINEER, SolidWorks, CATIA, etc., which are not limited here. The three-dimensional structure is designed according to the shape provided by the requirements, and then the injection port 12 for injection molding is designed. Generally, the injection port 12 is set at the place where the product thickness is the largest, because during the injection process, the injection port 12 may be broken due to the movement of the molding shell 10, but it is not absolute. The position of the injection port 12 may be changed according to the shape of the product and the design of the exhaust hole 14; Reference Figure 6~Figure 7 As shown, simulation software is used to simulate the flow state of liquid silicone in the molded shell 10; the simulation software is ANSYS Fluent, Autodesk Simulation CFD, Numeca, etc., and no further limitation is made here.

[0030] Reference Figure 1~Figure 4 As shown, the position of the vent hole 14 is designed according to the simulated flow state of the liquid silicone in the molding shell 10. The position of the vent hole 14 is set at the end of the material flow path or the position where the two streams converge. This part needs to be designed according to the flow state of the simulation software. If it is impossible to design a reasonable vent hole 14 according to the flow simulation state of the simulation software, the position of the injection port 12 can also be changed according to the actual situation. The main function of designing a reasonable position of the vent hole 14 is to reduce bubbles and pores. When the plastic or liquid material fills the mold molding cavity 111, the air and the gas inside the material need to have an outlet, otherwise bubbles or pores will be formed, affecting the appearance and performance of the product. In addition, the vent hole 14 helps the material flow more smoothly into every corner of the mold, reducing the resistance during the filling process and improving the filling efficiency.

[0031] After a reasonable molding shell 10 is designed, the 3D printer can be started to print the molding shell 10. In this embodiment, in order to facilitate the observation of the flow state during injection, the printing molding material used in the present invention needs to be a transparent high-temperature resistant material, and the thermal deformation temperature of the material needs to be as high as 100-200 degrees to ensure that the shell will not be deformed during the support dissolution process. The material also needs to have a certain degree of transparency. During the injection of the silicone material, it is convenient to observe the flow state of the material in the shell so that timely adjustments can be made to avoid the generation of bubbles. In addition, the material also needs to have a relatively low impact strength to reduce the difficulty of breaking the shelling mold after the silicone product is formed, and reduce the damage to the internal silicone product during the crushing process. Therefore, in one embodiment, the present invention adopts a photocurable material, the composition of the photocurable material is (by weight percentage): 14%~22% of an oligomer, wherein the oligomer includes one or more aminomethyl ester (meth) acrylates; 65%~75% of a diluent, wherein the diluent is selected from one of methacrylate, dimethacrylate, triacrylate and diacrylate, 5%~11% of a curing reactant, wherein the curing reactant is selected from at least one of non-oligomeric urea (meth) acrylate and isocyanurate (meth) acrylate; 3%~5% of a photoinitiator, wherein the photoinitiator is selected from an α-cleavage type photoinitiator and does not contain a non-reactive wax. In this embodiment, the photocurable material selects 16% aminomethyl ester (meth) acrylate, 14% curing reactant, the diluent includes 19% SR506, 8% SR833, 40% SR205, the photoinitiator selects 2% α-cleavage type photoinitiator, and 1% additives. The tensile modulus of the printed material is 2764Mpa and the tensile strength is 65.3Mpa, which meets the requirements of the present invention for transparent, high hardness and low impact strength materials. This material is not limited here, and other hot-soluble materials can also be used for 3D printing. In another embodiment, the present invention uses a photosensitive resin material, which includes 26% octahydro-4,7-methylene-1H-indene-1,5-ylidene) bis(methylene) diacrylate, 27% (exo) 2-methyl-2-acrylic acid 1,7,7-trimethylbicyclo[2.2.1]hept-2-ol ester, 26% 4-(1-oxo-2-propenyl) Morpholine, 19.4% polyether polyurethane methacrylate, 1.5% phenyl (2,4,6-trimethylbenzoyl) phosphine oxide, 0.1% 2,6-di-tert-butyl-p-methylphenol, the material has good transparency, tensile strength of 70-80Mpa, tensile modulus of 2500-3000Mpa, notched impact strength of 14-17J / m, 0.45Mpa heat deformation temperature of 90-100C, which meets the requirements of the present invention for transparent, high hardness and low impact strength materials.

[0032] Reference Figure 8As shown in the figure, among many 3D printing processes, photocuring 3D printing can obtain relatively delicate feature performance, smooth surface finish and dimensional accuracy. However, whether it is a photocuring 3D printer based on surface projection technology or laser scanning technology, printing hollow structure parts cannot completely avoid the support inside the shell, and these supports cannot be removed because they are enclosed inside the shell. This process method uses a photocuring 3D printer based on material jetting technology to print and manufacture hollow shells. Since the printer of this molding technology uses low melting point wax as support material, transparent high temperature resistant material is used as shell molding material. When the shell is printed, the support inside and outside the shell can be melted and removed by heating. After the support inside the shell is melted, it can be discharged through the exhaust hole and injection port under the action of gravity. The transparent shell material makes it easy to observe whether the support inside the shell is completely discharged, and it is also easy to observe the flow state of silicone inside the shell during the silicone injection process, so as to make adjustments and avoid bubbles. Therefore, when using this 3D printing technology to print hollow shells, there is no need to worry about the problem of being unable to remove internal supports, which effectively solves the process difficulties in manufacturing thin shell molds. The above-mentioned material has strong thermoplasticity. In the process of manufacturing the molded shell 10, a thinner molded shell 10 is manufactured. The material has a higher heat deformation temperature to prevent thermal deformation during the thermal dissolution of the support.

[0033] Reference Figure 9~Figure 11 As shown, the liquid silicone is then injected into the molding shell 10 through the injection mechanism 20, and the molding shell 10 is destroyed after curing to obtain a silicone product. In one embodiment, an appropriate amount of platinum curing agent is added to the A glue of the liquid silicone to prevent the silicone from contacting with the photosensitive resin material to cause a reaction without curing. Then the A glue and the B glue of the liquid silicone are mixed and stirred, and then placed in a vacuum degassing machine for degassing. The curing time of the liquid silicone after being injected into the molding shell is 4~5h. Compared with the traditional injection mold, the manufacturing cycle is greatly shortened, and the silicone sample can be delivered basically within 1~2 days. The three-dimensional structure of the silicone product is designed by computer-aided software, and then it is printed out by 3D printing technology, and then after post-processing, a hollow shell mold for liquid silicone curing molding is manufactured. Finally, the liquid silicone is injected into the molding shell 10 through the injection mechanism 20, and then the molding shell is destroyed after a certain period of curing and shaping, and the silicone product can be obtained. Compared with the traditional silicone mold design, the silicone product obtained by this method can effectively reduce the high mold manufacturing cost and the long mold manufacturing cycle, and obtain a fast and low-cost silicone product. In addition, the silicone products made by 3D printing molds have high precision and no parting lines.

[0034] Reference Figures 1 to 4As shown, the present invention also relates to a liquid silicone 3D printing rapid prototyping device, including a molding shell 10, wherein the molding shell 10 includes a shell body 11, wherein the shell body 11 has a molding cavity 111 therein, and the molding cavity 111 is consistent with the size of the silicone product to be printed. In the present embodiment, the molding cavity 111 is in a U shape, an injection port 12 is provided at one end of the shell body 11, and a plurality of exhaust columns 13 are provided at one end of the shell body 11 away from the injection port 12, wherein the exhaust columns 13 need to be arranged opposite to the injection port 13, and an exhaust hole 14 is generally arranged at the end of the material flow path or at the position where two material flows converge, and the exhaust column 13 has an exhaust hole 14 for exhausting gas therein.

[0035] Reference Figure 3 As shown, in this embodiment, the exhaust hole 14 includes a first section of exhaust holes 141 close to one end of the molding cavity 111 and a second section of exhaust holes 142 connected to the first section of exhaust holes 141. The shape of the first section of exhaust holes 141 is circular. The first section of exhaust holes 141 needs to ensure the uniformity of exhaust. The overall length of the exhaust column 13 is defined as , the length of the first exhaust hole 141 is , then the length of the first exhaust hole 141 is The overall length of the exhaust column 13 In this embodiment, the overall length of the exhaust column 13 is The length of the first exhaust hole 141 is 20 mm. The length is 6mm. The purpose of setting this length is that the first section vent hole 141 is used as the main vent hole and is connected to the molding cavity 111. After the molded part, a silicone handle will be generated at the injection port and the vent port. After the handle is cut off, a mark will be left on the surface of the product. In order to minimize the image of the mark on the appearance of the part, the first section vent hole is as small as possible, but it is necessary to ensure that the wax material inside can flow out smoothly. Therefore, it is generally recommended that the diameter of the vent hole is not less than 0.5mm. Too large vent holes are not conducive to forming a certain cavity pressure during silicone filling. The cavity pressure helps to squeeze the small bubbles generated during the silicone flow process. The diameter of the second section vent hole can be appropriately increased to speed up the discharge of the internal wax material. Because the aperture of the first vent hole 141 is small, generally not less than 0.5mm, the shape of the second section vent hole 142 is a water drop shape. The purpose of setting it in a water drop shape is to improve the exhaust efficiency of the second section vent hole 142. The second section vent hole 142 is α° outwardly drafted and set on the first section vent hole 141. The draft angle α=1~2.5°. In one embodiment, the draft angle α is 1°. The purpose of setting this angle is to enable the second-stage exhaust hole 142 to improve the exhaust efficiency. If the draft angle α is greater than 2.5°, the overall thickness of the exhaust column 13 increases. Since the number of exhaust columns 13 of the molded shell 10 is set according to the shape of the model, there may be multiple exhaust columns, which will increase the overall consumables and increase the cost. If the draft angle α is less than 1°, the exhaust effect is not significantly improved. Therefore, the draft angle α set in this embodiment is 1°, which can effectively control the cost of consumables and improve the exhaust efficiency of the exhaust hole.

[0036] The thickness selection of the molding shell 10 is particularly important. The thickness of the molding shell 10 is 0.5~1.5mm. The thickness of the molding shell 10 is proportional to the size of the molding shell 10. The thickness of the molding shell 10 must not only meet the ability of the shell mold to resist thermal deformation during the high-temperature wax melting process, but also reduce the difficulty of breaking the shell after molding. A high-thickness shell is not easy to deform, but it is more difficult to break later, which may damage the molded product. For complex or large products, multi-curved surfaces and thin-walled structures need to uniformly increase the shell thickness to ensure the stability of the cavity shape. Setting a molding shell 10 with a thickness of 1.2~1.5mm can effectively prevent deformation or rupture during the process of heating and removing the supporting material from the molding shell 10. For medium-sized complex products, it is necessary to consider certain molding difficulty and cost, and a moderate shell thickness (0.8~1.2mm) should be selected. For simple or small products, such as flat parts, a thinner shell (0.5~0.8mm) can be selected, which is easy to break the molding shell 10 to prevent the structure of the silicone product from being damaged during the crushing of the molding shell 10. And the shell thickness matches the size of the exhaust hole and the injection port.

[0037] Table 1 Relationship between the thickness of the molded shell and the silicone product

[0038] After selecting the shell thickness, flow simulation (such as ANSYS Fluent) is performed to analyze the silicone filling state under different thicknesses, optimize the combination of the exhaust hole position and the shell thickness, and produce molded shells 10 with different thicknesses.

[0039] Reference Figures 1 to 3 As shown, the injection mechanism 20 is connected to the injection port 12, and is used to inject liquid silicone into the molding cavity 111, and then solidify it to form a silicone product. The injection mechanism 20 can be selected, and a circle of connecting ports 121 are set on the outer wall of the injection port 12. The thickness of the connecting ports 121 is 1~2mm. In this embodiment, the overall thickness of the molding shell is 1.5mm, and the thickness of the connecting ports 121 is 1mm. The connecting ports 121 can strengthen the strength of the injection port 12 to prevent cracks from occurring at the injection port 12 during the process of connecting the injection mechanism 20. Therefore, it is necessary to increase the connecting ports 121 to increase the strength of the molding shell 10.

[0040] Reference Figure 4 , Fig. 9 As shown, in another embodiment, in order to strengthen the exhaust column 13, a connecting column 15 is added between adjacent exhaust columns 13, and the connecting column 15 is a solid cylindrical shape. The connecting column 15 is used to connect adjacent exhaust columns 13. Since the size and wall thickness of the exhaust columns 13 are relatively small, the connecting column 15 can increase the strength of the exhaust column 13. Spherical structures are set at both ends of the connecting column 15. The purpose is not only to enhance the ability of the exhaust column to resist thermal deformation when the wax is melted at high temperature, but also to accelerate the discharge of the supporting wax inside the shell.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A liquid silicone 3D printing rapid prototyping device, characterized in that: include: A molding shell (10) comprises a shell body (11), wherein the shell body (11) has a molding cavity (111) therein, an injection port (12) is provided at one end of the shell body (11), and a plurality of exhaust columns (13) are provided at one end of the shell body (11) away from the injection port (12), wherein the exhaust column (13) has an exhaust hole (14) for exhausting gas; The injection mechanism (20) is connected to the injection port (12) and is used to inject liquid silicone into the molding cavity (111) for further curing to form a silicone product.

2. A liquid silicone 3D printing rapid prototyping device according to claim 1, characterized in that: The exhaust hole (14) comprises a first exhaust hole (141) close to one end of the molding cavity (111) and a second exhaust hole (142) connected to the first exhaust hole (141). The first exhaust hole (141) is circular in shape. The overall length of the exhaust column (13) is defined as , the length of the first exhaust hole (141) is , then the length of the first exhaust hole (141) is The overall length of the exhaust column (13) 1 / 3~2 / 5 of it.

3. A liquid silicone 3D printing rapid prototyping device according to claim 2, characterized in that: The second-stage exhaust hole (142) is in the shape of a water droplet, and is drafted outward at an angle of α° on the first-stage exhaust hole (141), with the draft angle α=1-2.5°.

4. A liquid silicone 3D printing rapid prototyping device according to claim 3, characterized in that: The thickness of the molded shell (10) is 0.5-1.5 mm, and the thickness of the molded shell (10) is proportional to the size of the molded shell (10).

5. A liquid silicone 3D printing rapid prototyping method, comprising a liquid silicone 3D printing rapid prototyping device as claimed in any one of claims 1 to 4, characterized in that: The steps include: Designing a three-dimensional structural model of a silicone product molding shell (10) and an injection port (12) using computer-aided software; Using simulation software to simulate the flow state of liquid silicone in the molded shell (10); The position of the exhaust hole (14) is designed according to the simulated flow state of the liquid silicone in the molded shell (10); Starting the 3D printer to print the molded shell (10), and post-processing the printed molded shell (10); Liquid silicone is injected into the molded shell (10) through an injection mechanism (20), and the molded shell (10) is destroyed after solidification, thereby obtaining a silicone product.

6. A liquid silicone 3D printing rapid prototyping method according to claim 5, characterized in that: Designing the position of the vent hole (14) according to the simulated flow state of the liquid silicone in the molded shell (10) further includes arranging the position of the vent hole (14) at the end of the material flow path or at a position where two material flows meet.

7. A liquid silicone 3D printing rapid prototyping method according to claim 5, characterized in that: Starting the 3D printer to print the molded shell (10) includes using a material jetting light-curing 3D printer for printing and molding. The 3D printer is equipped with a piezoelectric print head, and the print head has two material cylinders, one of which is used to place a main material for making the molded shell (10), and the other is used to place a low-melting-point wax material for printing the support structure of the molded shell (10). The print head controls the material to be ejected in the form of droplets through a pulse signal, and then the material is cured and molded through ultraviolet light irradiation on the print head, and the molded shell (10) is printed layer by layer. After printing is completed, the low-melting-point wax material on the outside of the shell is melted and separated by heating, and the low-melting-point wax material on the inside of the shell is melted into a liquid and discharged from the injection port and the exhaust hole, thereby obtaining a thin-walled hollow molded shell (10) for liquid silicone molding.

8. A liquid silicone 3D printing rapid prototyping method according to claim 7, characterized in that: The main materials of the 3D printer are composed of oligomers, diluents, curing reactants and photoinitiators.

9. A liquid silicone 3D printing rapid prototyping method according to claim 8, characterized in that: An appropriate amount of platinum curing agent is added to the liquid silicone material.

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