A wet-molding rapid prototyping device and a rapid and accurate molding method thereof

Abstract

This invention discloses a wet molding rapid prototyping device, including a base, on which a mold body and a robot are mounted. The robot automatically applies a coating according to a program control when the mold body is opened. The mold body includes an upper mold and a lower mold arranged opposite each other. Multiple air extraction holes connected to a vacuum pump are provided within a closed section on the side wall of the lower mold. The upper mold is inserted into the lower mold during mold closing to form a closed structure. A pneumatic ejection structure is provided at the bottom of the inner wall of the lower mold. This invention automatically applies a coating layer using a robot controlled by a program. During mold closing, a closed space is formed within the mold body. By connecting the air extraction holes to a vacuum pump, air is extracted from the closed space, thereby removing air bubbles from the coating layer. After molding, the part is removed by the pneumatic ejection structure, resulting in small, thin-walled products with smooth, bubble-free surfaces and rapid demolding.

Description

Technical Field

[0001] This invention relates to the field of wet molding technology, specifically to a wet molding rapid prototyping device and its rapid and accurate molding method. Background Technology

[0002] Wet molding is a process that uses dry fibers and liquid resin as raw materials. The liquid resin is coated onto the surface of the dry fibers using methods such as spraying, pouring, or brushing, followed by molding, heating, pressing, and pressure treatment for curing. Conventional wet molding often uses epoxy resin-based resins and carbon fibers. For epoxy resin-based resins, the mold needs to be adjusted according to different temperature requirements in each molding cycle, and the curing and demolding processes are time-consuming, thus affecting the overall molding cycle. Furthermore, for this type of process, prepreg sheets need to be stored at low temperatures, controlled between -5℃ and 0℃, requiring the construction of cold storage facilities to meet the raw material storage requirements. During cutting, the material needs to be allowed to rest at room temperature (26℃). Therefore, the storage and pretreatment of raw materials limit its application scenarios and further impact the production cycle.

[0003] Furthermore, epoxy resin-based resins have strict requirements for mixing ratios, especially when producing small products weighing 2-5 kg. The amount of each formulation added needs to be precise to the gram to meet the process requirements of mass production; otherwise, problems such as poor product surface quality and incomplete curing may occur during molding. This is particularly true for the production of thin-walled parts, where the requirements for mixing ratios and uniformity are even higher.

[0004] Existing wet molding methods involve injecting resin directly into the mold cavity in a single step, without multiple coatings based on the reinforcement layer layout. For small, thin-walled parts, this easily leads to uneven resin application, especially around the edges where insufficient resin is often observed. This not only affects product quality but also makes demolding difficult. Furthermore, to meet process requirements (such as uniform resin coating on the dry fiber surface), wet molding equipment typically applies the prepared resin to the dry fiber surface via spraying or brushing within a specified time, followed by curing through mold closing, heating, and pressurization. During spraying or brushing, air inevitably remains between the coating layers. Due to multiple coatings, this residual air can coalesce into bubbles. If these bubbles are not promptly removed during subsequent molding, they will remain in the workpiece, affecting product quality, especially for small, thin-walled parts. In existing wet molding equipment, due to the need for effective mold closing during curing, a closed structure is often used, preventing the timely removal of residual air and further impacting product quality. Summary of the Invention

[0005] The purpose of this invention is to provide a wet molding rapid prototyping device and a rapid and accurate molding method thereon, so as to solve the technical problems in the prior art where the molding method cannot uniformly coat the coating layer on the surface of the reinforcing layer, and the molding device cannot remove air bubbles and demold quickly.

[0006] In a first aspect of the invention, a wet molding rapid prototyping apparatus is provided, comprising a base, on which a mold body and a robot are mounted, wherein the robot automatically coats the mold body according to a program control when the mold body is opened;

[0007] The mold body includes an upper mold and a lower mold arranged opposite to each other. Multiple air extraction holes connected to a vacuum pump are provided in the closed area of ​​the side wall of the lower mold. When the upper mold is closed, it is inserted into the lower mold to form a closed space. When the upper mold and the lower mold are molded, the upper mold just blocks the air extraction holes, so that the coating layer inside the lower mold will not overflow from the air extraction holes. A pneumatic ejection structure is provided at the bottom of the inner wall of the lower mold.

[0008] Furthermore, a sealing structure is provided between the upper mold and the lower mold, so that a closed space can be formed between the upper mold and the lower mold. The sealing structure includes a sealing ring and a sealing groove. The sealing ring is fixedly connected to the bottom of the upper mold, and the sealing groove is opened at the top of the lower mold.

[0009] When the upper mold moves downward, the sealing ring engages in the sealing groove.

[0010] Furthermore, a lifting channel is provided at the bottom of the inner wall of the lower mold, and the pneumatic ejection structure includes a lifting rod disposed in the lifting channel. A lifting block that completely closes the opening of the lifting channel is fixedly installed on the top of the lifting rod. The side wall and top of the lifting block are respectively provided with demolding air holes and lifting air holes. When demolding is completed after curing, the workpiece is first shaken by air jetting through the lifting air holes so that the lifting block is lifted under the drive of the lifting rod to expose the demolding air holes. Gas is ejected from the side of the demolding air holes to separate the workpiece from the lower mold.

[0011] Furthermore, the lifting block is configured as a frustum shape, the vertical cross-section of the lifting block is configured as a trapezoid, and the top diameter of the lifting block is larger than its bottom diameter, and the demolding air hole is provided on the outer surface of the lifting block;

[0012] An annular support cylinder is fixedly connected to the inner wall of the lifting channel. The top of the support cylinder is provided with a downwardly inclined surface, which is in contact with the bottom of the lifting block.

[0013] The inclined surface at the top of the annular support cylinder is used to support the lifting block. When the upper mold and the lower mold are closed, the top of the support lifting block and the bottom of the inner wall of the lower mold are on the same plane.

[0014] In a second aspect of the present invention, a rapid and accurate wet molding method is provided, employing the aforementioned rapid wet molding apparatus, comprising the following steps:

[0015] Step 100: Pre-treat the reinforcing layer and place the pre-treated reinforcing layer into the mold cavity;

[0016] Step 200: The total amount of adhesive mixed in the coating layer, the mixing ratio, the coating path, and the coating flow rate are controlled by numerical control.

[0017] Step 300: The vacuuming sequence is superimposed to enter the pressure molding state, and the reinforcing layer and coating layer are heated and cured at a constant temperature.

[0018] Step 400: Remove the workpiece using pneumatic lifting and proceed to the next preparation cycle.

[0019] Furthermore, the reinforcing layer is specifically a woven glass fiber dry cloth, and the coating layer is specifically a polyurethane-based resin.

[0020] Furthermore, the specific method for program-controlled coating using numerical control is as follows:

[0021] Determine the specifications of the target product, and calculate the materials for the reinforcing layer and the coating layer according to the specifications of the target product;

[0022] Obtain the parameters of each pre-processed reinforcement layer, and calculate the matching angle and overall and local splicing method of the reinforcement layers based on the parameters of the reinforcement layers and the specifications of the target product to form a reinforcement layer laying model;

[0023] The coating layer is oriented and configured according to the differentiated characteristics of the reinforcement layer laying model, and the coating guidance of the coating layer is adjusted.

[0024] Furthermore, the coating guide includes coating paths and corresponding changes in adhesive flow rate on each coating path, and after each coating layer is completed, it also includes reinforcement paths and corresponding changes in adhesive flow rate on each reinforcement path;

[0025] The variations in adhesive flow rate along the coating path and the reinforcement path correspond one-to-one with the differential characteristics of the reinforcement layer laying model, all of which are calculated by the reinforcement layer laying model.

[0026] Furthermore, the specific method for entering the pressure molding state using a superimposed vacuum sequence is as follows:

[0027] When the upper mold presses down and just contacts the lower mold, a closed space is formed inside the mold body;

[0028] As the upper mold continues to press down, the air extraction port, under the action of the vacuum pump, performs vacuuming of the enclosed space according to the vacuuming sequence to remove air bubbles in the coating layer and expel the gas from the enclosed space.

[0029] After the upper mold is pressed down through the enclosed space, the vacuum pump completes the vacuuming operation, and the upper mold continues to press down to perform molding and curing.

[0030] Furthermore, the specific method for removing the workpiece using pneumatic lifting is as follows:

[0031] The upper mold moves back to its original position, thus exposing the molded workpiece;

[0032] The lifting block is lifted upwards, causing the top part of the workpiece to separate from the lower mold, while exposing the demolding air hole;

[0033] Gas is ejected from the side through the demolding vents to completely separate the workpiece from the lower mold.

[0034] Compared with the prior art, the present invention has the following advantages:

[0035] 1. The present invention focuses on optimizing the coating layer by using polyurethane-based resin and CNC coating. It combines the characteristics of polyurethane-based resin with the determination of coating ratio, path and flow rate according to product molding requirements, so that it can be adapted to the preparation of small parts and thin-walled workpieces during the preparation process. At the same time, it reduces the product storage and pre-treatment processes and improves production efficiency.

[0036] 2. The molding device provided by the present invention automatically applies a coating layer according to the program-controlled robotic arm. During the mold closing process, a closed space is formed inside the mold body. By connecting the air extraction hole to a vacuum pump to extract the air in the closed space, the air bubbles inside the coating layer are removed, making the product surface smooth and bubble-free. It is also suitable for pneumatic rapid demolding and can take advantage of the characteristic that polyurethane-based resin curing does not require maintaining multiple temperatures, thereby improving the production efficiency of the product. Attached Figure Description

[0037] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the structure provided for an embodiment of the present invention;

[0039] Figure 2 For the present invention Figure 1 Enlarged view of the structure of section A in the middle;

[0040] Figure 3 This is a schematic flowchart of the rapid and accurate molding method of the present invention.

[0041] The labels in the diagram represent the following:

[0042] 1-Mold body; 2-Upper mold; 3-Lower mold; 4-Robot arm; 5-Vacuum extraction structure; 6-Ejection hole; 7-Pneumatic ejection structure; 8-Lifting block; 9-Demolding vent; 10-Sealing structure; 11-Sealing ring; 12-Sealing groove; 13-Lifting rod; 14-Lifting channel; 15-Annular support cylinder; 16-Inclined surface. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] In order to ensure product quality, multiple coating layers are often applied when producing small, thin-walled products. However, multiple coating layers can trap a large amount of air inside the coating layer, forming bubbles that affect the quality of the final molded product. Therefore, it is necessary to develop a wet molding device that can expel the air inside the coating layer.

[0045] like Figure 1 As shown, this invention provides a wet molding rapid prototyping device, which mainly extracts gas from the enclosed space inside the mold body 1 through the air extraction hole 6 to reduce product air bubbles. It includes a base, on which the mold body 1 and a robotic arm 4 are mounted. The robotic arm 4 automatically coats the product according to a programmed control when the mold body 1 is opened.

[0046] The mold body 1 includes an upper mold 2 and a lower mold 3 arranged opposite to each other. Multiple air extraction holes 6 connected to a vacuum pump are provided in the closed area of ​​the side wall of the lower mold 3. When the upper mold 2 is closed, it is inserted into the lower mold 3 to form a closed space. When the upper mold 2 and the lower mold 3 are molded, the upper mold 2 just blocks the air extraction holes 6, so that the coating layer inside the lower mold 3 will not overflow from the air extraction holes 6. A pneumatic ejection structure 7 is provided at the bottom of the inner wall of the lower mold 3.

[0047] The molding device provided by the present invention automatically applies a coating layer according to the program control of the robot arm 4. During the mold closing process, a closed space is formed inside the mold body 1. By connecting the air extraction hole 6 to the vacuum pump, the air in the closed space is extracted, thereby removing the air bubbles inside the coating layer. After molding, the part is removed by the pneumatic ejection structure 7, so that the surface of the produced small thin-walled product is smooth and free of air bubbles, and can be quickly demolded.

[0048] If the evacuation hole 6 is set too high in the lower mold 3, when the upper mold 2 and the lower mold 3 are closed, the closed space of the upper mold 2 and the lower mold 3 has not yet reached a negative pressure state, so the evacuation hole 6 will be blocked by the upper mold 2 and the air bubbles inside the coating layer cannot be removed.

[0049] If the evacuation hole 6 is set too low in the lower mold 3, after removing the air bubbles inside the coating layer, the coating layer will overflow from the evacuation hole 6 during the molding process of the upper mold 2 and the lower mold 3, which can easily block the evacuation hole 6 and make the final molded product thinner, affecting the quality.

[0050] The specific implementation method of this embodiment is as follows:

[0051] Step 1: Material feeding. When the upper mold 2 and the lower mold 3 are separated, the reinforcing layer is placed into the lower mold 3, and the adhesive is precisely applied by the robot arm 4 according to the preset program, and multiple layers are coated.

[0052] Step 2: Forming a closed space. During the mold closing process of the upper mold 2 and the lower mold 3, the upper mold 2 and the lower mold 3 form a closed space, and the coating layer is inside the closed space;

[0053] Step 3: Remove air bubbles. Connect the evacuation port 6 to the vacuum pump. Use the evacuation port 6 to create a vacuum in the enclosed space formed by the upper mold 2 and the lower mold 3, causing the air bubbles inside the coating layer to burst, thereby removing the air bubbles inside the coating layer and removing the air inside the enclosed space.

[0054] Step 4: Molding. As the upper mold 2 moves down, the air extraction hole 6 is blocked by the upper mold 2. Then, the film is closed to complete the molding and shape the product.

[0055] Step 5: Remove the part. After molding is completed, the workpiece is quickly demolded by the pneumatic ejection structure 7.

[0056] When dealing with small, thin-walled products that require multiple coating layers, this device can remove air bubbles inside the coating layer during the molding process, thus avoiding the impact of air bubbles on the final molded product.

[0057] If the seal between the upper mold 2 and the lower mold 3 is not tight and there is air leakage, it will be difficult to achieve a negative pressure environment in the enclosed space between the upper mold 2 and the lower mold 3, resulting in poor air bubble removal. To solve the problem of poor sealing between the upper mold 2 and the lower mold 3, further... Figure 1 As shown, a sealing structure 10 is provided between the upper mold 2 and the lower mold 3, so that a closed space can be formed between the upper mold 2 and the lower mold 3. The sealing structure 10 includes a sealing ring 11 and a sealing groove 12. The sealing ring 11 is fixedly connected to the bottom of the upper mold 2, and the sealing groove 12 is opened at the top of the lower mold 3.

[0058] When the upper mold 2 moves downward, the sealing ring 11 is engaged in the sealing groove 12.

[0059] A sealing structure 10 is set on the outside of the molding cavity, which can ensure the sealing of the closed space between the upper mold 2 and the lower mold 3 without affecting the molding effect.

[0060] After molding is completed, because the air bubbles inside the coating layer were removed by vacuuming, the closed space formed between the upper mold 2 and the lower mold 3 is still under negative pressure. After the upper mold 2 is removed by external force, the molded product is still tightly attached to the inner wall of the lower mold 3 and is not easy to demold and remove.

[0061] To solve the product demolding problem, further, such as Figure 2 As shown, a lifting channel 14 is provided at the bottom of the inner wall of the lower mold 3. The pneumatic ejection structure 7 includes a lifting rod 13 disposed within the lifting channel 14. A lifting block 8, which completely closes the opening of the lifting channel 14, is fixedly installed on the top of the lifting rod 13. The side wall and top of the lifting block 8 are respectively provided with demolding air holes 9 and lifting air holes (the lifting air holes are located in...). Figure 2 (Not shown in the drawing), when the workpiece is demolded after curing, the workpiece is first shaken by air jetting through the lifting air hole so that the lifting block 8 is lifted under the drive of the lifting rod 13 to expose the demolding air hole 9. The demolding air hole 9 sprays gas from the side to separate the workpiece from the lower mold 3.

[0062] When preparing for demolding, the workpiece is first shaken by air jets through the lifting air hole so that the lifting block 8 is lifted under the drive of the lifting rod 13 to expose the demolding air hole 9. Then, the lifting rod 13 is lifted upward a certain distance so that the demolding air hole 9 is exposed from the side. When the lifting rod 13 is lifted upward, it will separate the part of the workpiece from the lower mold 3. Then, gas is sprayed out from the side through the demolding air hole 9 to separate the entire workpiece from the lower mold 3, achieving a rapid demolding effect. Finally, the lifting rod 13 continues to lift to complete the workpiece removal process.

[0063] When the upper mold 2 and the lower mold 3 are closed, the upper mold 2 exerts a large squeezing force on the lower mold 3. If the bottom of the lifting block 8 is not supported, the lifting block 8 will sink, resulting in defects in the molded product.

[0064] To ensure that the top of the lifting block 8 always remains at the same level as the bottom of the inner wall of the lower mold 3, further, as follows: Figure 2 As shown, the lifting block 8 is configured as a frustum shape, the vertical cross-section of the lifting block 8 is configured as a trapezoid, and the top diameter of the lifting block 8 is larger than its bottom diameter. The demolding air hole 9 is provided on the outer surface of the lifting block 8.

[0065] The inner wall of the lifting channel 14 is fixedly connected to an annular support cylinder 15. The top of the support cylinder is provided with a downwardly inclined surface 16, and the inclined surface 16 is in contact with the bottom of the lifting block 8.

[0066] The inclined surface 16 at the top of the annular support cylinder 15 is used to support the lifting block 8. When the upper mold 2 and the lower mold 3 are closed, the top of the supporting lifting block 8 and the bottom of the inner wall of the lower mold 3 are on the same plane.

[0067] Since the annular support cylinder 15 always supports the lifting block 8, the lifting block 8 will not sink during the molding process. The lifting block 8 is set in the shape of a frustum, and the demolding air hole 9 is on the side of the lifting block 8, so that the top of the lifting block 8 protects the demolding air hole 9 and facilitates the lifting block 8 to move down smoothly and return to its original position after being lifted.

[0068] The following describes the wet molding rapid prototyping device, such as... Figure 3 As shown, a rapid and accurate wet molding method is provided, including the following steps:

[0069] Step 100: Pre-treat the reinforcing layer and place the pre-treated reinforcing layer into the mold cavity;

[0070] Step 200: The total amount of adhesive mixed in the coating layer, the mixing ratio, the coating path, and the coating flow rate are controlled by numerical control.

[0071] Step 300: The vacuuming sequence is superimposed to enter the pressure molding state, and the reinforcing layer and coating layer are heated and cured at a constant temperature.

[0072] Step 400: Remove the workpiece using pneumatic lifting and proceed to the next preparation cycle.

[0073] The molding method provided by this invention uses CNC coating to control the glue application path and flow rate according to the reinforcement layer laying situation, ensuring the glue ratio, total amount, glue application path and glue flow rate. Even for small thin-walled products, the glue application amount can be accurately controlled to avoid insufficient material around the workpiece. Afterwards, the quality and production efficiency of small thin-walled molded products are improved by vacuuming to remove air bubbles and by pneumatic lifting.

[0074] To reduce production costs and improve the quality of small parts, the reinforcing layer is specifically a woven glass fiber dry cloth, and the coating layer is specifically a polyurethane-based resin. The polyurethane-based resin coating can be stored at room temperature, is easy to handle, requires no preheating time, and is cured at a constant temperature of 100℃-120℃, eliminating the need for multiple temperature adjustments and reducing production costs. It is suitable for producing small, thin-walled products.

[0075] The above describes the overall wet molding method. The specific operation steps are detailed below:

[0076] First, the specific method for program-controlled coating using numerical control is as follows:

[0077] Determine the specifications of the target product, and calculate the materials for the reinforcing layer and the coating layer according to the specifications of the target product;

[0078] Obtain the parameters of each pre-processed reinforcement layer, and calculate the matching angle and overall and local splicing method of the reinforcement layers based on the parameters of the reinforcement layers and the specifications of the target product to form a reinforcement layer laying model;

[0079] The coating layer is oriented and configured according to the differentiated characteristics of the reinforcement layer laying model, and the coating guidance of the coating layer is adjusted.

[0080] The coating guide includes the coating path and the corresponding glue flow rate change on each coating path. After each coating layer is completed, it also includes the reinforcement path and the corresponding glue flow rate change on each reinforcement path.

[0081] The variations in adhesive flow rate along the coating path and the reinforcement path correspond one-to-one with the differential characteristics of the reinforcement layer laying model, all of which are calculated by the reinforcement layer laying model.

[0082] This control method allows for targeted adjustment of the coating layer based on the parameters of each reinforcement layer, achieving multi-layer differentiated coating. This ensures that every product is precisely and completely coated, preventing any shortage of material.

[0083] Secondly, the specific method for entering the pressure molding state by using a superimposed vacuum sequence is as follows:

[0084] When the upper mold 2 is pressed down and just comes into contact with the lower mold 3, a closed space is formed inside the mold body 1;

[0085] As the upper mold 2 continues to press down, the air extraction port 6, under the action of the vacuum pump, performs vacuuming of the enclosed space according to the vacuuming sequence to remove air bubbles in the coating layer and discharge the gas in the enclosed space.

[0086] After the upper mold 2 is pressed down past the air extraction hole 6, the vacuum pump completes the vacuuming operation, and the upper mold 2 continues to be pressed down for molding and curing.

[0087] By creating a closed space between the upper mold 2 and the lower mold 3, a space with negative pressure is created. During the mold closing process, air is extracted from the closed space, creating negative pressure within the closed space, which removes air bubbles from the coating layer and solves the defect of a large number of air bubbles generated by multi-layer coating.

[0088] Because air is extracted from the enclosed space before molding, creating a negative pressure environment inside the enclosed space, the upper mold 2 can be removed by external force, while the molded product will simply adhere to the inner wall of the lower mold and is not easy to remove.

[0089] To facilitate the removal of molded products, the specific method for removing the workpiece using pneumatic lifting is as follows:

[0090] The upper mold 2 moves upward and returns to its original position, thus exposing the molded workpiece;

[0091] The lifting block 8 is lifted upwards, causing the top part of the workpiece of the lifting block 8 to separate from the lower mold 3, while exposing the demolding air hole 9;

[0092] Gas is ejected from the side through the demolding vent 9 to completely separate the workpiece from the lower mold 3;

[0093] The lifting block 8 continues to lift, causing the workpiece to detach from the lower mold 3.

[0094] When preparing for demolding, the workpiece is first shaken by air jets through the lifting air hole so that the lifting block 8 is lifted under the drive of the lifting rod 13 to expose the demolding air hole 9. The lifting rod 13 continues to lift upwards a certain distance so that the demolding air hole 9 is exposed from the side. When the lifting rod 13 lifts upwards, it will cause this part of the workpiece to separate from the lower mold 3. Then, gas is sprayed out from the side through the demolding air hole 9 to separate the entire workpiece from the lower mold 3, achieving a rapid demolding effect.

[0095] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A wet compression rapid prototyping apparatus, comprising: Includes a base, on which a mold body (1) and a robot (4) are mounted, wherein the robot (4) automatically coats the mold body (1) according to a program control when the mold body (1) is opened; The mold body (1) includes an upper mold (2) and a lower mold (3) arranged opposite to each other. Multiple air extraction holes (6) connected to a vacuum pump are provided in the closed area of ​​the side wall of the lower mold (3). When the upper mold (2) is closed, it is inserted into the lower mold (3) to form a closed space. When the upper mold (2) and the lower mold (3) are molded, the upper mold (2) just blocks the air extraction holes (6), so that the coating layer inside the lower mold (3) will not overflow from the air extraction holes (6). A pneumatic ejection structure (7) is provided at the bottom of the inner wall of the lower mold (3). The bottom of the inner wall of the lower mold (3) is provided with a lifting channel (14). The pneumatic ejection structure (7) includes a lifting rod (13) provided in the lifting channel (14). A lifting block (8) that is completely closed to the opening of the lifting channel (14) is fixedly installed on the top of the lifting rod (13). The side wall and top of the lifting block (8) are respectively provided with demolding air holes (9) and lifting air holes. When the demolding is completed, the workpiece is first shaken by air jetting through the lifting air holes so that the lifting block (8) is lifted under the drive of the lifting rod (13) to expose the demolding air holes (9). The demolding air holes (9) spray gas from the side to separate the workpiece from the lower mold (3). The lifting block (8) is configured as a frustum shape, the vertical cross-section of the lifting block (8) is configured as a trapezoid, and the top diameter of the lifting block (8) is larger than its bottom diameter. The demolding air hole (9) is provided on the outer surface of the lifting block (8). The inner wall of the lifting channel (14) is fixedly connected to an annular support cylinder (15), and the top of the support cylinder is provided with a downwardly inclined surface (16), which is in contact with the bottom of the lifting block (8). The inclined surface (16) at the top of the annular support cylinder (15) is used to support the lifting block (8). When the upper mold (2) and the lower mold (3) are closed, the top of the supporting lifting block (8) and the bottom of the inner wall of the lower mold (3) are on the same plane.

2. The wet compression molding rapid prototyping apparatus according to claim 1, wherein A sealing structure (10) is provided between the upper mold (2) and the lower mold (3) to form a closed space between the upper mold (2) and the lower mold (3); The sealing structure (10) includes a sealing ring (11) and a sealing groove (12). The sealing ring (11) is fixedly connected to the bottom of the upper mold (2), and the sealing groove (12) is opened at the top of the lower mold (3). When the upper mold (2) moves down, the sealing ring (11) is engaged in the sealing groove (12).

3. A quick and accurate molding method based on the wet compression molding rapid prototyping device according to any one of claims 1 or 2, characterized in that, Includes the following steps: Step 100: Pre-treat the reinforcing layer and place the pre-treated reinforcing layer into the mold cavity; Step 200: The total amount of adhesive mixed in the coating layer, the mixing ratio, the coating path, and the coating flow rate are controlled by numerical control. Step 300: The vacuuming sequence is superimposed to enter the pressure molding state, and the reinforcing layer and coating layer are heated and cured at a constant temperature. Step 400: Remove the workpiece using pneumatic lifting and proceed to the next preparation cycle.

4. The rapid and accurate wet molding method according to claim 3, characterized in that, The reinforcing layer is specifically a woven glass fiber dry cloth, and the coating layer is specifically a polyurethane-based resin.

5. A wet-molding rapid and accurate molding method according to claim 4, wherein The specific method for program-controlled coating using numerical control is as follows: Determine the specifications of the target product, and calculate the materials for the reinforcing layer and the coating layer according to the specifications of the target product; Obtain the parameters of each pre-processed reinforcement layer, and calculate the matching angle and overall and local splicing method of the reinforcement layers based on the parameters of the reinforcement layers and the specifications of the target product to form a reinforcement layer laying model; The coating layer is oriented and configured according to the differentiated characteristics of the reinforcement layer laying model, and the coating guidance of the coating layer is adjusted.

6. A wet compression molding method for quick and accurate molding according to claim 5, wherein The coating guide includes the coating path and the corresponding glue flow rate change on each coating path. After each coating layer is completed, it also includes the reinforcement path and the corresponding glue flow rate change on each reinforcement path. The variations in adhesive flow rate along the coating path and the reinforcement path correspond one-to-one with the differential characteristics of the reinforcement layer laying model, all of which are calculated by the reinforcement layer laying model.

7. A wet compression molding method for rapid and accurate molding according to claim 6, wherein The specific method for entering the pressure molding state by using a superimposed vacuum sequence is as follows: When the upper mold presses down and just contacts the lower mold, a closed space is formed inside the mold body; As the upper mold continues to press down, the air extraction port, under the action of the vacuum pump, performs vacuuming of the enclosed space according to the vacuuming sequence to remove air bubbles in the coating layer and expel the gas from the enclosed space. After the upper mold is pressed down through the enclosed space, the vacuum pump completes the vacuuming operation, and the upper mold continues to press down to perform molding and curing.

8. The method according to claim 7, wherein The specific method for removing the workpiece using pneumatic lifting is as follows: The upper mold moves back to its original position, thus exposing the molded workpiece; The lifting block is lifted upwards, causing the top part of the workpiece to separate from the lower mold, while exposing the demolding air hole; Gas is ejected from the side through the demolding vents to completely separate the workpiece from the lower mold.

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