A protection treatment method for a complex structure metal framework core mold before filling

Abstract

The present application relates to the technical field of composite material forming, and particularly relates to a protection treatment method before filling of a core mold of a metal framework with a complex structure. The treatment method comprises the following steps: S100, preparation; S200, preparation of silicone rubber; S300, coating of the filling silicone rubber; S400, filling of the core mold, machining and composite material forming; and S500, completion of product preparation, removal of the core mold and finished product silicone rubber. The treatment method has the advantages of simplifying the operation process, reducing the operation difficulty, improving the labor efficiency, shortening the curing time, making the coating uniform and complete, shortening the protection time of the whole framework, being suitable for the wide temperature range post-curing process requirement, effectively buffering and eliminating the damage of the removal tool to the metal framework, avoiding the resin from entering the hollow hole and the part with a rib plate included angle during the resin pouring process, reducing the difficulty of the core mold removal and the framework cleaning in the later period, and being easier to clean and remove without residue.

Description

Technical Field

[0001] This invention relates to the field of composite material molding technology, and in particular to a protective treatment method for complex structure metal skeleton core mold before filling. Background Technology

[0002] Many composite material products require mandrel filling of a metal skeleton before fabrication, followed by machining of the composite material molding surface. After molding, the mandrel is removed to obtain the final product. Currently, foaming is commonly used for mandrel filling, followed by machining the required product shape, laying fiber cloth on the mandrel surface, and then removing the mandrel to complete the composite material product manufacturing. Because the foamed material has high density and high strength after curing, removing the mandrel from complex skeleton structures is extremely difficult and easily damages the metal skeleton. Irreversible damage to the skeleton caused by mandrel removal affects the performance and overall aesthetics of the final product.

[0003] Traditional methods of protecting metal frames primarily involve coating and covering them with release wax, polyester film, or sticker-like materials to prevent direct contact between the foam and the metal frame, thereby reducing adhesive strength and making disassembly easier. For example, Chinese invention patent CN114131796A discloses a method and application for manufacturing lightweight, high-strength male molds suitable for large composite material structural components, belonging to the field of composite material and frame-filled male mold manufacturing. This invention proposes a lightweight, high-strength male mold manufacturing technology that uses a combination of polyurethane foam and a soluble core mold. The polyurethane foam is encapsulated within the soluble core mold, significantly reducing the density of the soluble core mold and preventing excessive weight and slippage during processing. The foam can be quickly extracted after dissolution. Simultaneously, the surface is made from the soluble core mold. However, this method has the following shortcomings: for some complex metal skeletons, the operability of wrapping with polyester film is poor; the strength of film and sticker-type covering materials is limited, and they cannot effectively buffer or avoid damage to the metal skeleton by the removal tools during core mold removal; the bonding strength between foam material and film and sticker-type covering materials is still relatively high, the removal difficulty has not been significantly reduced, and it is difficult to completely remove them; film and sticker-type covering materials are difficult to operate and have low work efficiency when covering complex metal skeletons. Summary of the Invention

[0004] In view of this, the present invention aims to provide a protective treatment method for complex metal skeleton core molds before filling. It uses liquid two-component room temperature curing silicone rubber to replace the film and sticker-type covering materials used in the prior art to protect the metal skeleton. This solves the problems of poor operability of wrapping polyester film around some complex metal skeletons; the limited strength of film and sticker-type covering materials, which cannot effectively buffer or prevent damage to the metal skeleton by removal tools during core mold removal; the still high bonding strength between foaming material and film and sticker-type covering materials, which does not significantly reduce the difficulty of removal and is difficult to completely remove; and the high operational difficulty and low work efficiency of film and sticker-type covering materials when covering complex metal skeletons.

[0005] To address the above problems, this invention provides a protective treatment method for complex structure metal skeleton core molds before filling. This method involves coating the metal skeleton core mold with silicone rubber to achieve protection. The treatment method includes:

[0006] S100. Preparation work, including cleaning the metal frame and drying the clean metal frame.

[0007] S200, the production of silicone rubber, involves mixing silicone rubber component A and silicone rubber component B in a 1:1 ratio to form premixed silicone rubber, and then degassing the premixed silicone rubber in a vacuum environment to form finished silicone rubber.

[0008] S300. Coating and filling with silicone rubber: The finished silicone rubber is evenly coated or sprayed onto the metal skeleton and cured at room temperature, or cured by heating.

[0009] S400: The core mold is filled by foaming, followed by machining and composite material molding processes.

[0010] S500: Complete the fabrication of the composite material product, and remove the core mold and the finished silicone rubber.

[0011] Furthermore, in step S200, the method for producing the premixed silicone rubber includes: weighing the silicone rubber component A and the silicone rubber component B multiple times and mixing them until a preset amount of the premixed silicone rubber is produced;

[0012] Each time the amount of silicone rubber component A and silicone rubber component B is weighed, it must be ensured that curing does not occur during the mixing process.

[0013] Furthermore, in step S200, the method for preparing the silicone rubber includes:

[0014] The temperature is 15-25℃, the humidity is ≤65%, and the total mass of a single batch is 2-3kg.

[0015] During mixing, the mechanical stirring time shall not be less than 5 minutes, and the manual stirring time shall not be less than 10 minutes, until the premixed silicone rubber is uniformly mixed and has a consistent color.

[0016] Furthermore, in step S200, the method for degassing the premixed silicone rubber under vacuum includes:

[0017] Place the mixed silicone rubber in a vacuum buffer tank, close the air inlet valve, connect the air extraction valve to the vacuum, and turn on the vacuum. When the vacuum reaches 0.090 MPa, maintain the vacuum for 5 to 10 minutes. Observe the bubbling of the silicone rubber through the observation window. Release the pressure through the air inlet valve to prevent the silicone rubber bubbles from accumulating. After degassing is completed, take it out.

[0018] Furthermore, in step S200, the silicone rubber also includes fumed silica.

[0019] The proportion of the silicone rubber components coated on the inclined surface of the metal skeleton is: silicone rubber component A: silicone rubber component B: fumed silica = 1:1:0.01~0.03, and the proportion of fumed silica increases with the increase of the angle of the inclined surface of the metal skeleton.

[0020] The ratio of the components of the silicone rubber coated on the vertical surface of the metal skeleton is: silicone rubber component A: silicone rubber component B: fumed silica = 1:1:0.04~0.05.

[0021] Furthermore, in step S300,

[0022] The coating conditions are:

[0023] When the temperature is 15-25℃ and the humidity is ≤65%, the operation time is 30-40 minutes.

[0024] When the ambient temperature is 25-35℃, the operation time is 15-25 minutes;

[0025] The curing conditions are:

[0026] When the temperature is 15-25℃, the curing time is 2-3 hours;

[0027] When the temperature is between 25℃ and 35℃, the curing time is 1 hour to 2 hours.

[0028] When the temperature is between 35℃ and 60℃, the curing time is less than 10 minutes.

[0029] Furthermore, in step S300, the coating method includes:

[0030] The thickness of a single coating on the horizontal surface is 2-3mm. The hollow holes and the rib cavity are completely filled with the same size. The corners of the ribs are repeatedly coated to form rounded corners.

[0031] Furthermore, the metal skeleton must be coated with protective coating within 2 hours after cleaning.

[0032] Furthermore, in step S500, the method for completing the fabrication of the composite material article and removing the core mold and the finished silicone rubber includes:

[0033] S510. After the composite material product is molded, the core mold is removed until the silicone rubber film is exposed.

[0034] S520: Cut open the silicone rubber film with a knife, tear it off the metal frame, and clean it by blowing.

[0035] Furthermore, the silicone rubber is a thickened two-component room temperature vulcanizing silicone rubber with high toughness and tear resistance, and an elongation at break of ≥200%.

[0036] Compared with existing technologies, the protective treatment method for complex structure metal skeleton core mold filling described in this invention has the following advantages:

[0037] The advantages of this technical solution lie in its use of a two-component room-temperature vulcanizing thickened silicone rubber to coat the metal skeleton, which simplifies the skeleton protection process, reduces operational difficulty, and improves labor efficiency. By adjusting the proportion of the thickener, fumed silica, silicone rubbers of different viscosities can be obtained to treat skeleton parts with different spatial states, solving the problems of voids, sagging, and uneven coating. The coating is uniform, complete, and continuous, facilitating cleaning and removal. By increasing the temperature, the curing time of the silicone rubber is shortened, resolving the problems of voids, sagging, and uneven coating. The coating is uniform, complete, and continuous, facilitating cleaning and removal, thus shortening the overall skeleton protection time and improving efficiency. Utilizing room-temperature curing silicone rubber material, a high-temperature resistant protective layer is formed after curing, exhibiting stability during subsequent temperature-increased curing, making it suitable for wide-temperature post-curing processes from room temperature to high temperatures. A room-temperature curing silicone rubber material forms a buffer membrane on the skeleton surface, effectively cushioning and eliminating damage to the metal skeleton from removal tools during core mold removal. It also prevents resin from entering the perforated holes and rib corners during resin injection, reducing the difficulty of subsequent core mold removal and skeleton cleaning. The silicone rubber used has weak adhesion to the foam filler after room-temperature curing, allowing for manual removal and further reducing the difficulty of core mold removal. Compared to film or sticker-like coatings, the weak adhesion of the room-temperature cured silicone rubber to the skeleton makes it easier to clean and remove without residue. Attached Figure Description

[0038] Figure 1This is a perspective view of the metal frame according to the first embodiment of the present invention;

[0039] Figure 2 This is a perspective view of the metal frame according to the second embodiment of the present invention;

[0040] Figure 3 This is a perspective view of the metal frame according to the third embodiment of the present invention.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1-Frame, 2-Welding foot, 3-Hole, 4-Cavity, 5-Hollow, 6-Angle. Detailed Implementation

[0043] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0044] In this invention, the terms "first," "second," "upper," and "lower," etc., are used for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," "upper," or "lower" may explicitly or implicitly include at least one of those features. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. Where the technical solutions of the embodiments can be combined, they are all within the scope of protection claimed by this invention.

[0045] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0046] like Figure 1 and Figure 2 As shown, a protective treatment method for a complex structure metal skeleton core mold before filling is provided. This method involves coating the metal skeleton core mold with silicone rubber to protect it. The treatment method includes:

[0047] S100. Preparation work includes cleaning the metal frame. Use a clean cloth dampened with cleaning agent to wipe it at least 3 times until the cloth is free of obvious stains. Dry the clean metal frame to prevent silicone contamination and poisoning.

[0048] S200, the preparation of silicone rubber: Silicone rubber component A and silicone rubber component B are mixed and stirred in a 1:1 ratio until a predetermined amount of premixed silicone rubber is formed. The amount of silicone rubber component A and component B weighed each time must be sufficient to prevent curing during the mixing process. The premixed silicone rubber is then degassed under vacuum. The mixed silicone rubber is placed in a vacuum buffer tank, the inlet valve is closed, and the vacuum valve is connected to the vacuum system. The vacuum is turned on, and when the vacuum level reaches 0.090 MPa, it is maintained for 5–10 minutes. The bubbling of the silicone rubber is monitored through the observation window. Pressure is released through the inlet valve to prevent the silicone rubber from accumulating. After degassed, the finished silicone rubber is removed.

[0049] During the above production process, the temperature is 15-25℃, the humidity is ≤65%, and the total mass of a single batch is 2-3kg.

[0050] During mixing, the mechanical stirring time shall not be less than 5 minutes, and the manual stirring time shall not be less than 10 minutes, until the premixed silicone rubber is uniformly mixed and has a consistent color.

[0051] S300: Apply the degassed silicone rubber evenly to the surface of the metal skeleton using a clean brush. Repeat the application process, avoiding drips and missed spots. For areas difficult to reach manually, use a spray gun to cover the rubber. Curing can be performed at room temperature or accelerated by heating.

[0052] The coating conditions are:

[0053] When the temperature is 15-25℃ and the humidity is ≤65%, the operation time is 30-40 minutes.

[0054] When the ambient temperature is 25-35℃, the operation time is 15-25 minutes;

[0055] The curing conditions are:

[0056] When the temperature is 15-25℃, the curing time is 2-3 hours;

[0057] When the temperature is between 25℃ and 35℃, the curing time is 1 hour to 2 hours.

[0058] When the temperature is between 35℃ and 60℃, the curing time is less than 10 minutes.

[0059] The thickness of a single coating on the horizontal surface is 2-3mm. The 5-hole positions and the 4-position cavity of the rib plate are completely filled with the same size. The 6-position of the rib plate angle is repeatedly coated to form a rounded corner.

[0060] The metal skeleton must be coated with protective coating within 2 hours after cleaning.

[0061] Based on the above steps, check for any missed or insufficient coating, and promptly recoat to the required thickness.

[0062] S400: The core mold is filled by foaming, followed by machining and composite material molding processes.

[0063] S500, Complete the fabrication of the composite material product, remove the core mold and the finished silicone rubber, including:

[0064] S510. After the composite material product is molded, the core mold is removed until the silicone rubber film is exposed.

[0065] S520: Cut open the silicone rubber film with a knife, tear it off the metal frame, and clean it by blowing.

[0066] The silicone rubber is a thickened two-component room temperature vulcanizing silicone rubber with high toughness and tear resistance, and an elongation at break of ≥200%.

[0067] A two-component, room-temperature vulcanizing, thickening silicone rubber coating of a metal skeleton simplifies the skeleton protection process, reduces operational difficulty, and improves labor efficiency. By adjusting the proportion of fumed silica (a thickener), silicone rubbers of varying viscosities are obtained to treat skeleton areas with different spatial states, resolving issues such as flow defects, sagging, and uneven coating. The resulting coating is uniform, continuous, and easy to clean and remove. Increasing the temperature further shortens the silicone rubber curing time, resolving flow defects, sagging, and uneven coating. The coating remains uniform, continuous, and easy to clean and remove, thus reducing the overall skeleton protection time and improving efficiency. The room-temperature curing silicone rubber material forms a high-temperature resistant protective layer after curing, exhibiting stability during subsequent temperature-increased curing, making it suitable for wide-temperature post-curing processes from room temperature to high temperatures. A room-temperature curing silicone rubber material forms a buffer membrane on the skeleton surface, effectively cushioning and eliminating damage to the metal skeleton from removal tools during core mold removal. It also prevents resin from entering the perforated holes and rib angles during resin injection, reducing the difficulty of subsequent core mold removal and skeleton cleaning. The silicone rubber used, after room-temperature curing, has weak adhesion to the foam filler and can be manually peeled off, effectively reducing the difficulty of core mold removal. Compared to film or sticker-type coatings, the weak adhesion of the room-temperature cured silicone rubber to the skeleton makes it easier to clean and remove without residue.

[0068] Furthermore, in step S200, the silicone rubber also includes fumed silica.

[0069] The proportion of the silicone rubber components coated on the inclined surface of the metal skeleton is: silicone rubber component A: silicone rubber component B: fumed silica = 1:1:0.01~0.03, and the proportion of fumed silica increases with the increase of the angle of the inclined surface of the metal skeleton.

[0070] The ratio of the components of the silicone rubber coated on the vertical surface of the metal skeleton is: silicone rubber component A: silicone rubber component B: fumed silica = 1:1:0.04~0.05.

[0071] The following examples illustrate the processing method of the present invention.

[0072] Example 1

[0073] like Figure 1 As shown, under ambient temperature of 25℃ and humidity of 57%, silicone rubber coating was used to protect the intersection of the longitudinal and transverse ribs of the metal skeleton before filling.

[0074] S100 Cleaning: The metal frame must be cleaned before applying silicone rubber. Wipe it with a clean cloth dampened with cleaning agent to ensure that the frame surface is clean and dry.

[0075] S200, Preparation of silicone rubber: Place and weigh 1 kg of silicone rubber component A, 1 kg of silicone rubber component B, and 40 g of fumed silica in a clean container.

[0076] First, manually mix the fumed silica into the silicone rubber liquid, then mechanically stir for 6 minutes until the color is uniform.

[0077] The mixed silicone rubber was placed in a buffer tank and vacuum degassed. After the vacuum level reached -0.090 MPa, the degassed rubber was depressurized for 5 minutes and then removed.

[0078] S300. Apply silicone rubber to filler. Use a clean brush to apply the prepared silicone rubber paste to the intersection of the longitudinal and transverse ribs of the metal skeleton at weld foot 2 and the surface of the adjacent metal rib plate. The weld foot 2 is thickened by repeated application. The entire coating process is completed within 30 minutes.

[0079] Based on the above steps, check for any missed or insufficient coating, and touch up the coating promptly.

[0080] Based on the above steps, maintain an ambient temperature of 25°C for 1-2 hours to allow the silicone rubber film to fully cure and form an insulating protective layer.

[0081] The S400 process involves conventional core mold foaming and filling of metal skeletons, linear machining, and composite material molding.

[0082] S500 After the composite material product is molded, the core mold is removed until the silicone rubber film is exposed.

[0083] Following the steps described above, use a knife to cut open the silicone rubber membrane and tear it off from the metal skeleton. A simple cleaning process with the skeleton intact will yield a composite material product.

[0084] Example 2

[0085] like Figure 2 As shown, silicone rubber was used to fill the holes 3 in the metal rib plate under ambient temperature of 30℃ and humidity of 55%.

[0086] S100 Cleaning: The metal frame must be cleaned before applying silicone rubber. Wipe it with a clean cloth dampened with cleaning agent to ensure that the frame surface is clean and dry.

[0087] S200, Preparation of silicone rubber: Place and weigh 1.5 kg of silicone rubber component A, 1.5 kg of silicone rubber component B, and 150 g of fumed silica in a clean container.

[0088] First, manually mix the fumed silica into the silicone rubber liquid, then mechanically stir for 10 minutes until the color is uniform.

[0089] The mixed silicone rubber was placed in a buffer tank and vacuum degassed. After the vacuum level reached -0.090 MPa, the degassed rubber was depressurized for 8 minutes and then removed.

[0090] S300. Apply silicone rubber. Wearing disposable gloves, use the prepared silicone rubber to fill the holes 3 of the metal stiffener in the same size. Then, use a clean brush to apply the prepared silicone rubber paste to the surface of the metal stiffener. The silicone rubber is retained in the hole 3 by repeated application. The entire coating process is completed within 20 minutes.

[0091] Based on the above steps, check for any missed or insufficient coating, and touch up the coating promptly.

[0092] Based on the above steps, maintain an ambient temperature of 30°C. After 70 minutes, the silicone rubber film will be completely cured, forming a filler and an insulating protective layer.

[0093] The S400 process involves conventional core mold foaming and filling of metal skeletons, linear machining, and composite material molding.

[0094] S500 After the composite material product is molded, the core mold is removed until the silicone rubber film is exposed.

[0095] Following the steps described above, use a knife to cut open the silicone rubber membrane and tear it off from the metal skeleton. A simple cleaning process with the skeleton intact will yield a composite material product.

[0096] Example 3

[0097] like Figure 3 As shown, the cavity 5 of the metal component was filled and protected by silicone rubber coating under the conditions of ambient temperature of 30℃ and humidity of 55%.

[0098] S100 Cleaning: The metal frame must be cleaned before applying silicone rubber. Wipe it with a clean cloth dampened with cleaning agent to ensure that the frame surface is clean and dry.

[0099] Cavity 4 side wall cutout 5 sealing: Use polyester film transparent tape to seal the side wall cutout 5 of the rib plate cavity 4 to prevent side leakage when silicone rubber is poured in.

[0100] S200. Preparation of silicone rubber: Place and weigh 1.0 kg of silicone rubber component A and 1.0 kg of silicone rubber component B in a clean container.

[0101] Premix the silicone rubber using mechanical stirring for 5 minutes until the color is uniform.

[0102] The mixed silicone rubber was placed in a buffer tank and vacuum degassed. After the vacuum level reached -0.090 MPa, the degassed rubber was depressurized for 5 minutes and then removed.

[0103] S300. Apply silicone rubber to fill the cavity. Wear disposable gloves and pour the prepared silicone rubber into the semi-open cavity 4 of the metal part. Use a brush to apply the silicone rubber to the outer metal surface of the cavity 4. Repeat the operation to ensure that the cavity 4 is completely occupied and that there is no missed coating on the metal surface.

[0104] Based on the above steps, maintain an ambient temperature of 30°C. After 70 minutes, the silicone rubber will be completely cured, forming a filler.

[0105] After the silicone rubber in the filling area has cured, remove the polyester film from the sidewall of cavity 4, prepare a small amount of silicone rubber according to the above operation, and coat it on the metal surface of the sidewall of cavity 4.

[0106] Maintain an ambient temperature of 30°C. After 70 minutes, the silicone rubber will be fully cured, forming a protective layer that is continuous with the filler.

[0107] The S400 process involves conventional core mold foaming and filling of metal skeletons, linear machining, and composite material molding.

[0108] S500 After the composite material product is molded, the core mold is removed until the silicone rubber film is exposed.

[0109] Based on the above steps, the silicone rubber membrane is cut open with a knife and removed from the metal skeleton and cavity 4. A simple blowing and cleaning process yields a composite material product with an intact skeleton.

[0110] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A method for protective treatment before filling a core mold of a complex metal skeleton, characterized in that, A method for protecting the metal skeleton (1) core mold by coating it with silicone rubber, the method comprising: S100, Preparation work, including cleaning the metal frame (1) and drying the clean metal frame (1); S200, the production of silicone rubber, involves mixing silicone rubber component A and silicone rubber component B in a 1:1 ratio to form premixed silicone rubber, and then degassing the premixed silicone rubber under vacuum to form finished silicone rubber. S300, Coating and filling with silicone rubber, uniformly applying or spraying the finished silicone rubber onto the metal skeleton (1), and curing it at room temperature, or accelerating the curing by heating; Silicone rubber also contains fumed silica; The proportion of the silicone rubber components coated on the inclined surface of the metal skeleton (1) is: silicone rubber component A: silicone rubber component B: fumed silica = 1:1:0.01~0.03, and the proportion of fumed silica increases with the increase of the angle of the inclined surface of the metal skeleton (1). The proportion of the silicone rubber components coated on the vertical surface of the metal skeleton (1) is: silicone rubber component A: silicone rubber component B: fumed silica = 1:1:0.04~0.05; The thickness of a single coating on the horizontal surface is 2-3mm. The hollow (5) hole position and the rib cavity position are completely filled with the same size. The rib angle (6) position is repeatedly coated to form a rounded corner. S400: The core mold is filled by foaming, followed by machining and composite material molding processes. S500: Complete the fabrication of the composite material product, and remove the core mold and the finished silicone rubber.

2. The protective treatment method for the complex structure metal skeleton (1) before core mold filling according to claim 1, characterized in that, In step S200, the method for producing the premixed silicone rubber includes: weighing the silicone rubber component A and the silicone rubber component B multiple times and mixing them until a predetermined amount of the premixed silicone rubber is produced; Each time the amount of silicone rubber component A and silicone rubber component B is weighed, it must be ensured that curing does not occur during the mixing process.

3. The protective treatment method for complex structure metal skeleton core mold before filling according to claim 2, characterized in that, In step S200, the method for preparing silicone rubber includes: The temperature is 15-25℃, the humidity is ≤65%, and the total mass of a single batch is 2~3kg; During mixing, the mechanical stirring time shall not be less than 5 minutes, and the manual stirring time shall not be less than 10 minutes, until the premixed silicone rubber is uniformly mixed and has a consistent color.

4. The protective treatment method for complex structure metal skeleton core mold before filling according to claim 1, characterized in that, In step S200, the method for degassing the premixed silicone rubber under vacuum includes: Place the mixed silicone rubber in a vacuum buffer tank, close the air inlet valve, connect the air extraction valve to the vacuum, and turn on the vacuum. When the vacuum reaches 0.090 MPa, maintain the vacuum for 5 to 10 minutes. Observe the bubbling of the silicone rubber through the observation window. Release the pressure through the air inlet valve to prevent the silicone rubber bubbles from accumulating. After degassing is completed, take it out.

5. The protective treatment method for complex structure metal skeleton core mold before filling according to claim 1, characterized in that, In step S300, The coating conditions are: When the temperature is 15-25℃ and the humidity is ≤65%, the operation time is 30-40 minutes. When the ambient temperature is 25-35℃, the operation time is 15-25 minutes; The curing conditions are: When the temperature is 15-25℃, the curing time is 2-3 hours; When the temperature is between 25℃ and 35℃, the curing time is 1h to 2h. When the temperature is between 35℃ and 60℃, the curing time is less than 10 minutes.

6. The protective treatment method for complex structure metal skeleton core mold before filling according to claim 1, characterized in that, The metal skeleton (1) must be coated with protective coating within 2 hours after cleaning.

7. The protective treatment method for complex structure metal skeleton core mold before filling according to claim 1, characterized in that, In step S500, the method for completing the fabrication of the composite material article and removing the core mold and the finished silicone rubber includes: S510. After the composite material product is molded, the core mold is removed until the silicone rubber film is exposed. S520. Cut open the silicone rubber film with a knife and tear it off from the metal frame (1), and clean it by blowing.

8. The protective treatment method for complex structure metal skeleton core mold before filling according to claim 1, characterized in that, The silicone rubber is a thickened two-component room temperature vulcanizing silicone rubber with high toughness and tear resistance, and an elongation at break of ≥200%.

Images