Vacuum assembly structure and assembly process of silica gel aluminum core

Abstract

The application relates to the technical field of component assembly, in particular to a silica gel aluminum core vacuum assembly structure and an assembly process. The silica gel aluminum core vacuum assembly structure comprises an aluminum core and a silica gel sleeve. An assembly cavity is formed in the silica gel sleeve, the shape of the assembly cavity is matched with the shape of the aluminum core, a placing opening communicating with the assembly cavity is reserved on the silica gel sleeve, a gas guide groove is formed on the inner wall of the silica gel sleeve, the gas guide groove is communicated with a vacuum adsorption device, and the gas on the adhering surface of the silica gel sleeve and the aluminum core is discharged. The silica gel aluminum core vacuum assembly structure can fully discharge the excess gas on the adhering surface of the silica gel sleeve and the aluminum core, the adhering surface of the silica gel sleeve and the aluminum core is tightly adhered with a small gap, and finally the adhering gap is stably controlled to be less than or equal to 0.02 mm. The structure effectively eliminates the component deformation and warping problems caused by the gas residue in the traditional assembly, significantly improves the product size precision and structural stability, and solves the problems of sealing failure and aluminum core corrosion caused by gas accumulation.

Description

Technical Field

[0001] This application relates to the field of component assembly technology, and in particular to a silicone aluminum core vacuum assembly structure and assembly process. Background Technology

[0002] In the field of precision component assembly, the combination structure of silicone sleeves and metal cores is widely used in electronic components, hydraulic seals, medical devices, and other fields due to its excellent sealing, cushioning, and adaptability. Among them, aluminum cores, with their advantages of light weight, high strength, and good thermal conductivity, have become the preferred material for silicone sleeves paired with metal cores.

[0003] In existing technologies, the assembly of silicone sleeves and aluminum cores often employs a direct embedding method, relying on the elastic deformation of the silicone sleeve itself to press the aluminum core into the cavity of the silicone sleeve. However, this assembly method has a significant drawback: air is easily trapped at the contact surface between the silicone sleeve and the aluminum core during the assembly process, and this air is difficult to completely expel through natural compression. The residual air forms tiny air chambers inside the component. During subsequent storage, transportation, or use, these air chambers expand or contract due to factors such as temperature changes and external pressure, leading to a series of problems.

[0004] On the one hand, gas accumulation can disrupt the bonding stability between the silicone sleeve and the aluminum core, leading to localized deformation and warping of the components, which seriously affects the dimensional accuracy and appearance quality of the products. On the other hand, residual air can reduce the sealing performance between the silicone sleeve and the aluminum core, allowing external dust, liquids, and other impurities to easily penetrate into the components through the gaps, causing corrosion of the aluminum core and functional failure, ultimately significantly increasing the scrap rate of the products.

[0005] To address the aforementioned issues, some technical solutions attempt to improve the bonding effect by increasing the interference fit of the silicone sleeve and adding an external pressing process. However, increasing the interference fit can easily lead to tearing of the silicone sleeve or scratches on the surface of the aluminum core. The additional pressing process increases the production process and costs, and it still cannot completely remove residual air from the bonding surface, making it difficult to meet the assembly requirements of high precision and high reliability.

[0006] Therefore, developing an assembly structure and process that can efficiently expel gas from the bonding surface between the silicone sleeve and the aluminum core and achieve a tight fit between the two has become an urgent technical problem to be solved in this field. Summary of the Invention

[0007] This application provides a vacuum assembly structure and process for silicone-aluminum core to solve the problem in the prior art where gas accumulates between the silicone sleeve and the aluminum core, causing local deformation and warping of the components, which seriously affects product performance. This application can efficiently discharge the gas from the bonding surface between the silicone sleeve and the aluminum core, achieving a tight fit between the two and reducing the product scrap rate.

[0008] On the one hand, this application provides a silicone aluminum core vacuum assembly structure, including: Aluminum core; The silicone sleeve has an assembly cavity inside, the shape of which matches the shape of the aluminum core. The silicone sleeve has a pre-reserved insertion port that communicates with the assembly cavity. The inner wall of the silicone sleeve has a gas guide groove, which is connected to a vacuum adsorption device to discharge the gas from the mating surface of the silicone sleeve and the aluminum core.

[0009] In one possible design, the silicone sleeve includes a front wall, a rear wall, and a side wall, which together form an assembly cavity. The insertion port is located on the rear wall, and a sealing strip is provided around the insertion port on the rear wall.

[0010] In one possible design, the sealing strip is a raised structure protruding from the rear wall. After the filter element is fitted into the silicone sleeve, the sealing strip and the aluminum core automatically adhere to each other to form the first sealing band.

[0011] In one possible design, the air guide groove is formed on the side wall and surrounds the aluminum core. The side wall also has an interface that communicates with the air guide groove and is used to communicate with the vacuum adsorption device.

[0012] In one possible design, the interface incorporates a flexible unidirectional valve with a valve gap. Under normal conditions, the inner walls of the valve gap adhere to each other, achieving automatic closure. During vacuum adsorption, negative pressure forces open the valve gap, allowing gas to escape through it. The flexible unidirectional valve forms a second sealing layer.

[0013] In one possible design, the flexible unidirectional valve is made of elastic silicone material integrally molded with the silicone sleeve.

[0014] In one possible design, silicone microspheres are placed in the air guide groove, and these microspheres can expand under negative pressure. Under negative pressure, the silicone microspheres gradually expand until the vacuum between the inner wall of the silicone sleeve and the outer wall of the aluminum core reaches a preset value. At this point, the expanded volume of the silicone microspheres will fill the gap between the air guide groove and the outer wall of the aluminum core. After the negative pressure stops, the expanded microspheres remain in an elastically compressed state, forming a third sealing band to prevent external air from entering the bonding surface.

[0015] Specifically, the silicone microspheres are located at the connection between the air guide groove and the interface. A guide wire is installed at the connection between the interface and the air guide groove, and the silicone microspheres are threaded through the guide wire. When no negative pressure is formed, the diameter of the silicone microspheres is smaller than the diameter of the interface, and the airflow passes between the silicone microspheres and the inner wall of the interface. When the negative pressure reaches a certain value, the volume of the silicone microspheres expands to the point that they can block the silicone microspheres and the inner wall of the interface, thereby forming a third seal for the air guide groove.

[0016] In one possible design, before vacuum adsorption, the gap between the inner wall of the silicone sleeve and the mating surface of the aluminum core is 0.05-0.1mm.

[0017] On the other hand, this application also provides a vacuum bonding assembly process based on the above-mentioned silicone aluminum core vacuum assembly structure, the assembly process including the following steps: The aluminum core is embedded into the assembly cavity of the silicone sleeve to form a pre-assembled assembly; A vacuum adsorption device is used to apply a vacuum of 0.08-0.1 MPa to the pre-assembled components and adsorb for 10-40 seconds to remove excess gas between the silicone sleeve and the aluminum core bonding surface. Maintain vacuum adsorption until the silicone sleeve and aluminum core are tightly fitted together to complete the assembly.

[0018] In one possible design, after vacuum adsorption, the final fit gap between the silicone sleeve and the aluminum core is ≤0.02mm.

[0019] The beneficial effects of this application are as follows: The silicone-aluminum core vacuum assembly structure of this application can fully expel excess gas from the contact surface between the silicone sleeve and the aluminum core, ensuring a tight fit with minimal gaps. The final fit gap is stably controlled to ≤0.02mm. This structure effectively eliminates component deformation and warping problems caused by residual gas in traditional assembly processes, significantly improving product dimensional accuracy and structural stability. It fundamentally solves problems such as sealing failure and aluminum core corrosion caused by gas accumulation. In practical applications, it effectively reduces product scrap rates, significantly decreases raw material waste, and improves production efficiency.

[0020] The tight fit between the silicone sleeve and the aluminum core forms a reliable sealing barrier, effectively preventing the intrusion of external dust, liquids, and other impurities. This feature extends the service life of the component under harsh operating conditions, making it particularly suitable for applications with high sealing requirements, such as electronic components and hydraulic seals.

[0021] No additional interference bonding or rework processes are required, allowing direct integration with existing assembly lines. Vacuum adsorption parameters are easy to control and operation is convenient, effectively shortening production cycles and reducing labor and equipment investment costs while improving product quality.

[0022] The assembly process provided in this application, when used in conjunction with the silicone aluminum core vacuum assembly structure in this application, simultaneously incorporates all the aforementioned advantages of the silicone aluminum core vacuum assembly structure. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of the silicone aluminum core vacuum assembly structure provided in the embodiments of this application; Figure 2 This is a schematic diagram of the aluminum core structure of the silicone aluminum core vacuum assembly structure provided in the embodiments of this application; Figure 3 A schematic diagram of the silicone sleeve of the silicone aluminum core vacuum assembly structure provided in the embodiments of this application; Figure 4 A schematic diagram of the air guide groove of the silicone sleeve in the silicone aluminum core vacuum assembly structure provided in the embodiment of this application; Figure 5 This is a schematic diagram of the flexible unidirectional valve with a silicone sleeve and a silicone aluminum core vacuum assembly structure provided in the embodiments of this application.

[0025] Figure label: 1. Aluminum core; 2. Silicone sleeve; 21. Insertion port; 22. Air guide groove; 23. Interface; 24. Front wall; 25. Rear wall; 26. Side wall; 3. Sealing strip; 4. Flexible one-way valve; 5. Silicone microspheres. Detailed Implementation

[0026] The technical solutions of this application will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] The following is combined Figures 1-5 This describes the vacuum assembly structure of the silicone aluminum core 1 provided in the embodiments of this application.

[0028] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5As shown in the embodiment of this application, the vacuum assembly structure of the silicone aluminum core 1 includes an aluminum core 1 and a silicone sleeve 2. An assembly cavity is formed inside the silicone sleeve 2, the shape of which matches the shape of the aluminum core 1. An insertion port 21 communicating with the assembly cavity is provided on the silicone sleeve 2, through which the aluminum core 1 can be inserted into the assembly cavity. A gas guide groove 22 is formed on the inner wall of the silicone sleeve 2, which can communicate with a vacuum adsorption device to discharge gas from the contact surface between the silicone sleeve 2 and the aluminum core 1.

[0029] In some specific embodiments, the silicone sleeve 2 includes a front wall 24, a rear wall 25, and a side wall 26, which together form an assembly cavity. An insertion port 21 is opened in the rear wall 25, and a sealing strip 3 is provided around the insertion port 21 on the rear wall 25.

[0030] The sealing strip 3 has a raised structure that protrudes from the rear wall 25. After the aluminum core 1 is fitted into the silicone sleeve 2 and is drawn by the vacuum adsorption device, the sealing strip 3 and the aluminum core 1 are tightly adhered to each other, automatically forming the first sealing strip, which can prevent external air from entering the assembly cavity from the insertion port 21.

[0031] A gas guide groove 22 is formed on the side wall 26 and surrounds the aluminum core 1. An interface 23 communicating with the gas guide groove 22 is also formed on the side wall 26. The interface 23 is used to communicate with the vacuum adsorption device to provide a channel for gas discharge.

[0032] Interface 23 includes a flexible unidirectional valve 4, which is made of elastic silicone material integrally molded with the silicone sleeve 2. The flexible unidirectional valve 4 forms a valve gap, which naturally closes automatically when its inner walls adhere to each other. During vacuum adsorption, the negative pressure opens the valve gap, allowing gas to escape through it; after the negative pressure stops, the valve gap automatically closes, forming a second sealing band to prevent air backflow.

[0033] In some embodiments, the air guide groove 22 is provided with silicone microspheres 5, which can expand under negative pressure. The silicone microspheres 5 are made of highly elastic silicone rubber and have a porous mesh structure with a porosity of 30%-40%. Under external negative pressure, the silicone microspheres 5 exhibit excellent deformation capabilities. During vacuum adsorption, the silicone microspheres 5 gradually expand under negative pressure until the vacuum degree between the inner wall of the silicone sleeve 2 and the outer wall of the aluminum core 1 reaches a preset value. At this point, the expanded volume of the silicone microspheres 5 will fill the gap between the air guide groove 22 and the outer wall of the aluminum core 1. After the negative pressure stops, the expanded microspheres remain in an elastically compressed state, forming a third sealing band to further prevent external air from entering the bonding surface.

[0034] Before vacuum adsorption, the gap between the inner wall of the silicone sleeve 2 and the mating surface of the aluminum core 1 is 0.05-0.1mm. This gap design facilitates the insertion of the aluminum core 1 into the assembly cavity and also provides space for gas flow.

[0035] This application embodiment also provides a vacuum bonding assembly process for a vacuum assembly structure of silicone aluminum core 1, the assembly process including the following steps: The aluminum core 1 is inserted into the assembly cavity of the silicone sleeve 2 through the insertion port 21 on the rear wall 25 of the silicone sleeve 2 to form a pre-assembled assembly. At this time, the sealing strip 3 on the rear wall 25 is tightly fitted with the outer wall of the aluminum core 1 to form the first sealing strip, while the inner wall of the silicone sleeve 2 and the contact surface of the aluminum core 1 maintain a gap of 0.05-0.1mm.

[0036] Connect the vacuum adsorption device to the interface 23 on the side wall 26 of the silicone sleeve 2, start the vacuum adsorption device, and apply a vacuum of 0.08-0.1 MPa to the pre-assembled components for 10-40 seconds. Under negative pressure, the gap of the flexible one-way valve 4 in the interface 23 is opened, and the gas on the contact surface between the silicone sleeve 2 and the aluminum core 1 is discharged through the air guide groove 22, the interface 23, and the valve gap. At the same time, the silicone microspheres 5 in the air guide groove 22 gradually expand under negative pressure.

[0037] Maintain the vacuum adsorption state until the silica microspheres 5 fully expand and fill the gap between the air guide groove 22 and the outer wall of the aluminum core 1. At this point, the final bonding gap between the silica sleeve 2 and the aluminum core 1 is ≤0.02mm. Close the vacuum adsorption device, and the flexible one-way valve 4 automatically closes to form the second sealing strip. The expanded silica microspheres 5 remain in an elastic compression state to form the third sealing strip. The three sealing strips work together to prevent air backflow, completing the assembly.

[0038] The vacuum assembly structure and process of the silicone aluminum core 1 in this application, through the setting of air guide groove 22 and the use of vacuum adsorption device, can quickly expel the gas on the contact surface between the silicone sleeve 2 and the aluminum core 1, achieving a tight fit between the two. At the same time, the use of sealing strip 3, flexible one-way valve 4 and expanded silicone microspheres 5 to form a triple sealing band effectively prevents air backflow after the negative pressure stops, significantly improving the assembly accuracy and stability of the component and reducing the product scrap rate.

[0039] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0041] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0042] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0043] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A silicone aluminum core vacuum assembly structure, characterized in that, include: Aluminum core; A silicone sleeve has an inner cavity that matches the shape of the aluminum core. The silicone sleeve has an inlet that communicates with the assembly cavity. The inner wall of the silicone sleeve has a gas guide groove that communicates with a vacuum adsorption device to discharge gas from the mating surfaces of the silicone sleeve and the aluminum core.

2. The silicone aluminum core vacuum assembly structure according to claim 1, characterized in that, The silicone sleeve includes a front wall, a rear wall, and a side wall, which together form the assembly cavity. The insertion port is opened in the rear wall, and a sealing strip is provided around the insertion port on the rear wall.

3. The silicone aluminum core vacuum assembly structure according to claim 2, characterized in that, The sealing strip has a raised structure that protrudes towards the filter element from the rear wall.

4. The silicone aluminum core vacuum assembly structure according to claim 2, characterized in that, The air guide groove is formed on the side wall and surrounds the aluminum core. The side wall also has an interface that communicates with the air guide groove and is used to communicate with the vacuum adsorption device.

5. The silicone aluminum core vacuum assembly structure according to claim 4, characterized in that, The interface is equipped with a flexible one-way valve, which forms a valve gap. Under normal conditions, the inner walls of the valve gap fit together to achieve automatic closure. During vacuum adsorption, the negative pressure will open the valve gap, allowing gas to be discharged through the valve gap.

6. The silicone aluminum core vacuum assembly structure according to claim 5, characterized in that, The flexible unidirectional valve is made of elastic silicone material integrally molded with the silicone sleeve.

7. The silicone aluminum core vacuum assembly structure according to claim 4, characterized in that, The air guide groove is provided with silicone microspheres, which can expand under negative pressure.

8. The silicone aluminum core vacuum assembly structure according to claim 1, characterized in that, Before vacuum adsorption, the gap between the inner wall of the silicone sleeve and the mating surface of the aluminum core is 0.05-0.1mm.

9. A vacuum bonding assembly process based on the silicone aluminum core vacuum assembly structure according to any one of claims 1-8, characterized in that, Includes the following steps: The aluminum core is embedded into the assembly cavity of the silicone sleeve to form a pre-assembled assembly; A vacuum of 0.08-0.1 MPa is applied to the pre-assembled component using a vacuum adsorption device, and the adsorption is continued for 10-40 seconds to remove excess gas between the silicone sleeve and the aluminum core bonding surface. Maintain the vacuum adsorption state until the silicone sleeve and aluminum core are tightly fitted together to complete the assembly.

10. The assembly process according to claim 9, characterized in that: After vacuum adsorption, the final bonding gap between the silicone sleeve and the aluminum core is ≤0.02mm.

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