Gasket and protective device for manufacturing shell with crater

Abstract

The utility model discloses a gasket and a shell manufacturing protection device with a crater, the appearance of the gasket imitates the shape of the crater, the size of the gasket enables a gap to be formed between the gasket and the inner wall of the crater when the gasket is arranged in the crater, and the gasket is a heat-resistant material workpiece and can be applied to a subsequent cold isostatic pressing process; the gasket has rigidity and can provide supporting force for the crater when the gasket is placed in the crater so as to resist pulling force applied to the crater in the vacuumizing process. In addition, the gasket has elasticity and exhaust performance, can be synchronously and elastically compressed along with the crater, and leads out gas generated when the crater shrinks, so that the crater can be prevented from being stressed and cracked during vacuumizing, and the vacuum packaging yield and the cold isostatic pressing process yield can be effectively improved; meanwhile, only one hard fixing plate is needed, the packaging weight can be effectively reduced, the packaging thickness is reduced, and the productivity is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to, especially relate to a gasket and the shell manufacturing protection device with crater. BACKGROUND

[0002] The mobile phone backboard is a ceramic product with arc crater, which is concave on one side and convex on the other side corresponding to the concave side, thereby forming an arc crater shape. The specific process flow of product production is as follows: first, dry pressing, the product after the dry pressing process is a ceramic blank formed by the internal friction force of the powder under the action of pressure, so a layer of sponge is generally wrapped on the outer surface of the ceramic blank; then put it into a PE (Polyethylene) bag and a vacuum machine for vacuum sealing; finally, the dry-pressed ceramic blank after sealing is fixed by simply assembling two aluminum plates, such as Figure 1 As shown in (a), fix it with rubber bands and put it into a CIP (Cold Isostatic Pressing) furnace for CIP. Referring to Figure 1 (b) shows that the aluminum plate on the convex side corresponding to the arc crater of the product is completely avoided, and (c) shows that the aluminum plate on the concave side corresponding to the arc crater of the product is hollowed out to balance the CIP pressure. Since the dry-pressed ceramic blank is fixed by assembling aluminum plates, the following problems exist:

[0003] (1) Since the arc crater position of the product cannot be protected, the arc crater is prone to cracking under stress without support when vacuumizing because the PE bag will pull;

[0004] (2) Since the aluminum plate on the concave side is completely hollow, the process parameters during CIP are 180-200 MPa pressure for 10 min, and the blank will further shrink under high pressure, but because of the density difference at the arc position, the shrinkage ratio will be inconsistent. In the state of free shrinkage, different parts of the blank will crack due to different shrinkage ratios.

[0005] (3) Since two aluminum plates are used, the overall weight reaches more than 500g, which is difficult for manual operation and is not conducive to mass production; moreover, the overall thickness reaches 13mm after packaging with two aluminum plates, and only less than 80 sets of products can be placed in the CIP furnace body each time, which is low in efficiency.

[0006] The above information disclosed in the background section is only included to enhance the understanding of the background of the present disclosure, and therefore can contain information that is not prior art known to those of ordinary skill in the art at the present time. UTILITY MODEL CONTENT

[0007] The technical problem to be solved by this utility model is to provide a gasket and a protective device for manufacturing a shell with a crater, addressing the shortcomings of existing technologies such as the crater being prone to cracking under stress and low production efficiency.

[0008] The technical solution adopted by this utility model to solve its technical problem is:

[0009] On the one hand, a gasket is constructed for use in the vacuuming process of a blank with a crater shell. The gasket is shaped like the crater and is sized such that it forms a gap with the inner wall of the crater when placed inside the crater.

[0010] The gasket is made of heat-resistant and rigid material and is used to provide support for the crater when placed inside it to resist the pulling force generated by the vacuum negative pressure.

[0011] The gasket is elastic and has venting properties, and is used to elastically compress synchronously with the crater and to vent the gas generated when the crater contracts.

[0012] Furthermore, in the gasket described in this utility model, the surface of the gasket is provided with an venting groove.

[0013] Furthermore, in the gasket described in this utility model, the venting groove is in the form of a grid, formed by the intersection of multiple spaced first strip grooves and multiple spaced second strip grooves.

[0014] Furthermore, in the gasket described in this utility model, the extending direction of the first strip groove is parallel to the direction of the maximum radial dimension of the crater, and the extending direction of the second strip groove is parallel to the direction of the minimum radial dimension of the crater.

[0015] The spacing between the first strip grooves is smaller than the spacing between the second strip grooves.

[0016] Furthermore, in the gasket described in this utility model, the gasket is composed of multiple independent separate structures arranged side by side, and the side-by-side direction of the multiple separate structures is perpendicular to the depth direction of the crater.

[0017] Furthermore, in the gasket described in this utility model, the mating surfaces between adjacent split structures are inclined.

[0018] Furthermore, in the gasket described in this utility model, the side-by-side orientation of the plurality of the separate structures is consistent with the direction of the maximum radial dimension of the crater.

[0019] Furthermore, in the gasket described in this utility model, the circumferential sidewall between the bottom and top surfaces of the gasket is an inclined surface, and the dimension of the edge contour of the bottom surface of the gasket is larger than the dimension of the edge contour of the top surface of the gasket.

[0020] Furthermore, in the gasket described in this utility model, the gasket is made of bakelite.

[0021] Secondly, a protective device is constructed by creating a shell with a crater, including:

[0022] Gaskets as described above;

[0023] An inner soft insulating pad is used to enclose the shell blank filled with the pad;

[0024] A rigid fixing plate is used to place the shell blank that covers the soft insulating pad, and to keep the crater protruding side facing away from the rigid fixing plate;

[0025] An outer soft insulating pad is used to wrap the rigid fixing plate and the shell blank placed thereon.

[0026] The gasket and protective device with a crater-shaped shell of this invention have the following advantages: This invention constructs a gasket whose shape mimics the shape of a crater. The size of the gasket allows it to form a gap with the inner wall of the crater when placed inside. The gasket is made of heat-resistant material and can be used in subsequent CIP processes. The gasket is rigid, providing support to the crater when placed inside, resisting the pulling force applied to the crater during the vacuuming process. Furthermore, the gasket is elastic and has venting properties, allowing it to compress elastically with the crater and release the gas generated during crater contraction. Thus, this invention can prevent the crater from cracking under stress during vacuuming, effectively improving vacuum packaging yield and CIP process yield. Simultaneously, the protective device of this invention only requires a rigid fixing plate, effectively reducing packaging weight and thickness, and increasing production capacity. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or 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 only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a dry-pressed ceramic blank after it has been fixed and sealed in the prior art;

[0029] Figure 2 This is a three-dimensional structural diagram of the gasket in a specific embodiment of this utility model;

[0030] Figure 3 This is a top view of the gasket in a specific embodiment of this utility model;

[0031] Figure 4 This is a side view of the gasket in a specific embodiment of this utility model;

[0032] Figure 5 This is a schematic diagram illustrating the application process of manufacturing protective devices from casings;

[0033] Figure 6 This is a diagram illustrating the forces and exhaust principles during vacuuming.

[0034] The following are the labeling elements in the figure:

[0035] 1: Gasket; 11, 12: Split structure; 101: Joint surface; 102: Circumferential sidewall of the gasket; 103: First groove; 104: Second groove; 3: Sponge; 4: Aluminum plate; 5: Silicone pad; 6: PE bag. Detailed Implementation

[0036] To address the shortcomings of existing technologies, such as the susceptibility to cracking under stress in crater-shaped packaging and low production efficiency, this invention provides a gasket and a protective device for manufacturing a crater-shaped shell. The gasket is primarily used in the vacuuming process after the dry pressing of the crater-shaped shell blank. The gasket's shape mimics the crater's shape, and its dimensions create a gap between it and the inner wall of the crater when placed inside. The gasket is made of heat-resistant and rigid material, providing support to the crater to resist the tensile forces generated by the vacuum negative pressure. The gasket is also elastic and has venting properties, allowing it to compress elastically along with the crater and release gas generated during its contraction. Thus, this invention prevents the crater from cracking under stress during vacuuming, effectively improving vacuum packaging yield and CIP process yield. Furthermore, this protective device requires only a single rigid fixing plate, effectively reducing packaging weight and thickness, and increasing production capacity.

[0037] To facilitate understanding of this utility model, a more comprehensive description will be given below with reference to the accompanying drawings. The drawings illustrate typical embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete. It should be understood that the embodiments of this utility model and the specific features thereof are detailed descriptions of the technical solutions of this application, and not limitations thereof. Where there is no conflict, the embodiments of this utility model and the technical features thereof can be combined with each other.

[0038] refer to Figures 2-3 , Figure 2 1 is a three-dimensional structural schematic diagram of the gasket in a specific embodiment of this utility model, and 2 is a top view of the gasket in a specific embodiment of this utility model. Figure 4 This is a side view of the gasket in a specific embodiment of this utility model. The gasket of this utility model embodiment is used for a shell with a crater-like structure. The shell includes a first surface and a second surface disposed opposite to each other. The first surface is recessed, and the corresponding position of the second surface is raised to form the crater. The shell can be a partial exterior shell of various electronic devices with craters, such as a mobile phone back panel or a tablet back panel. This embodiment uses a mobile phone back panel as an example for illustration. The shell is made of ceramic material through dry pressing. The product after the dry pressing process is a ceramic blank formed by the bonding of powder under pressure and internal friction. The gasket of this utility model is used to fill the crater in this ceramic blank.

[0039] Specifically, the gasket's shape mimics the shape of the crater, meaning its geometry is adapted to the crater's structural features. The gasket's dimensions are optimized to ensure a uniform, equidistant gap between its circumferential sidewall and the crater's inner sidewall when assembled inside the crater. This gap between the gasket and the crater provides space for thermal shrinkage and deformation during subsequent processing. Typically, when the crater structure is racetrack-shaped, the gasket adopts a similar geometry, with its outer edge dimension reduced by a scaling factor less than and close to 1, thus forming a racetrack-shaped gap between the gasket's circumferential sidewall and the crater's inner wall. The gap width can be controlled within a suitable range. It should be noted that this invention is universally applicable to crater structures; besides racetrack shapes, it can also accommodate conventional geometric configurations such as rectangles, ellipses, and circles, without limitation.

[0040] In this invention, on the one hand, the gasket is made of heat-resistant and rigid material, providing support for the crater when placed inside it, and providing sufficient support to resist the tensile force generated by the vacuum negative pressure during vacuum packaging. On the other hand, the gasket is elastic and has venting properties, allowing it to elastically compress synchronously with the crater and vent the gas generated when the crater contracts, preventing gas from accumulating in the gap between the gasket and the blank, which could lead to the blank cracking.

[0041] In some embodiments, the gasket is made of bakelite, a common name for phenolic plastics, chemically known as phenolic resin, a thermosetting plastic based on phenolic resin. Because fillers such as wood flour are added during the manufacturing process of phenolic resin, it improves toughness and provides durability, high hardness, good wear resistance, high compressive strength, a smooth and glossy surface, shape stability, resistance to heat deformation, good cold resistance, non-flammability, good chemical stability, and excellent electrical insulation properties. Unlike rigid materials such as metals, bakelite does not hinder the further shrinkage of the ceramic blank during the CIP process at 180–200 MPa.

[0042] In this embodiment, during product manufacturing, it was found that in the CIP process, which requires holding at 180–200 MPa for 10 minutes, the original density was 2.98–3.0 g / cm³. 3 The ceramic blank will shrink further, reaching a density of 3.06–3.08 g / cm³. 3 Products shrink at a ratio of approximately 1.026 in the length-width direction and approximately 1.0098 in the thickness direction. Therefore, the fully contoured pad needs to be designed with a reasonable size to provide support during the CIP process, preventing the ceramic product from collapsing, while also allowing sufficient clearance to prevent cracking during the free shrinkage of the ceramic blank. After continuous improvement, the axial dimension of the fully contoured pad was determined to be in a ratio of 1:1.004 to the size of the inner wall of the ceramic blank's crater. At this ratio, support can be provided without affecting the shrinkage of the ceramic blank. In some embodiments, after the fully contoured pad designed according to this ratio is placed in the crater of the ceramic product, the yield rate in the subsequent CIP process remains above 90%, demonstrating the feasibility of mass production.

[0043] The circumferential sidewall between the bottom and top surfaces of the gasket can be a cylindrical surface parallel to the inner sidewall of the crater. In some embodiments, the circumferential sidewall between the bottom and top surfaces of the gasket can also be an inclined surface. The edge profile of the bottom surface of the gasket is larger than the edge profile of the top surface of the gasket. Here, the top and bottom surfaces of the gasket are opposite each other. The top surface of the gasket is approximately flush with the first surface of the shell, and the bottom surface of the gasket rests in the crater.

[0044] Because a sponge or other material is used to cover the gasket during actual vacuuming, in some embodiments, the surface (i.e., the top surface) of the gasket is also provided with venting grooves to allow for venting during the shrinkage of the ceramic blank and prevent the formation of air pockets. The shape of the venting grooves is not limited; for example, the venting grooves can be in the form of a grid, formed by the intersection of multiple spaced first strip grooves and multiple spaced second strip grooves.

[0045] Based on the racetrack-shaped structural feature of the crater in this embodiment, and considering the stress distribution characteristics of the racetrack-shaped structure, it is recommended to prioritize setting the extension direction of the first strip groove to be parallel to the direction of the maximum radial dimension of the crater, while keeping the extension direction of the second strip groove parallel to the direction of the minimum radial dimension of the crater. Considering the differences in stress bearing capacity, the spacing between the first strip grooves should be designed to be smaller than the spacing between the second strip grooves. This layout scheme can effectively optimize the mechanical performance of the structure.

[0046] Furthermore, in some embodiments, the gasket is composed of multiple independent separate structures arranged side by side, where "multiple" includes two or more.

[0047] The parallel orientation of the multiple split structures is perpendicular to, or orthogonal to, the longitudinal depth direction of the crater. The parallel orientation of the multiple split structures is horizontal, which can be understood as parallel to the shell surface, while the depth direction of the crater is perpendicular to the shell surface. The gasket adopts a split design, enabling adaptive resetting based on inertial mechanics principles during assembly, effectively avoiding the impact of machining accuracy fluctuations and manual positioning deviations on assembly quality.

[0048] Furthermore, the parallel orientation of the multiple modular structures aligns with the direction of the maximum radial dimension of the crater, and the mating surface between adjacent modular structures is inclined, thereby facilitating the placement of the modular structures into the crater. Furthermore, the mating surface can be either a plane or a wavy curved surface.

[0049] Based on the same inventive concept, this utility model also discloses a protective device for manufacturing a shell with a crater, which, in addition to the gasket as described above, also includes an inner soft insulating pad and an outer soft insulating pad. The inner soft insulating pad is used to wrap the shell blank filled with the gasket. A rigid fixing plate is used to place the shell blank wrapped with the soft insulating pad. The outer soft insulating pad is used to wrap the rigid fixing plate and the shell blank placed on it.

[0050] Taking a mobile phone back panel product as an example, the inner soft isolation pad can be made of sponge with a thickness of about 1.2mm, the rigid fixing plate is an aluminum plate with a thickness of about 6mm, and the outer soft isolation pad can be made of silicone pad block with a thickness of 1.5mm.

[0051] The role of the sponge is to cushion and protect the product during the vacuuming process. Additionally, it prevents ceramic products from directly contacting the aluminum plate. In CIP equipment, under pressure of 180–200 MPa, ceramic products further shrink, and direct contact with the aluminum plate would create negative pressure on both surfaces, making separation impossible. The sponge, with its high compression ratio, high elongation, and high resilience, provides excellent separation and protection.

[0052] The aluminum plate serves to support and protect ceramic products during vacuum packaging, as it helps the PE bag shrink during the vacuuming process. Aluminum, as a metal, possesses high strength, but its density is only 2.69 g / cm³. 3 The density of ordinary steel is 7.85 g / cm³. 3 About one-third of the material is used, making manual operation relatively easy. Furthermore, a dense aluminum oxide layer naturally forms on the surface of aluminum, providing very high oxidation resistance, eliminating the need for a protective coating.

[0053] The main component of silicone pads is silicon dioxide, which has an amorphous structure and stable chemical properties. Firstly, silicone has low surface activity and is physiologically inert. As a semi-inorganic polymer material, silicone is an inactive compound. After special modification, it can achieve fire-retardant and anti-aging properties. Combined with factory vulcanization, it becomes environmentally friendly, non-toxic, odorless, and essentially harmless to the environment and human body. Due to the flexibility of silicone molecular chains, it also possesses excellent lubrication, anti-sticking, hydrophobic, and defoaming properties. Secondly, silicone has excellent resistance to compression deformation. Whether in harsh environments such as high temperatures of 250℃ or low temperatures of -60℃, silicone exhibits good resistance to compression deformation and maintains a relatively stable state. In vacuum extrusion processes and under pressures of 180–200 MPa in CIP processes, it can effectively wrap and protect aluminum plates, preventing the aluminum plates from tearing the outermost PE bag. Finally, it has strong antioxidant properties. Because silicone has no double bonds in its main chain, it is not easily degraded by external ozone, ultraviolet rays, etc., so it has excellent radiation resistance and can be reused outdoors for a long time at a low cost.

[0054] The following describes the application of the protective casing manufacturing device of this embodiment to the production of ceramic back panels for mobile phones. The complete production process mainly includes dry pressing, vacuum packaging, CIP, CNC machining, degreasing, sintering, HIP, and annealing. In this embodiment, the ceramic blank is obtained after dry pressing, such as... Figure 5 In this context, the numbers 3, 4, 5, and 6 represent sponge, aluminum plate, silicone pad, and vacuum bag (e.g., PE bag), respectively. Figure 5As shown in (a), the gasket structure 11 is placed in the groove corresponding to the crater on the back of the ceramic product, and then the gasket structure 12 is placed in the groove on the back of the ceramic blank. The structures 11 and 12 are then assembled to form the gasket. Figure 5 As shown in (b), the assembly in (a) is wrapped with a piece of sponge; and so on. Figure 5 As shown in (c), place a flat aluminum plate under the sponge, keeping the crater-shaped protrusion facing away from the aluminum plate, i.e., the first side of the product faces the aluminum plate and the second side faces away from the aluminum plate; and so on. Figure 5 As shown in (d), the assembly in (c) is wrapped with a silicone pad and then placed in a PE bag for vacuum sealing.

[0055] refer to Figure 6 Images (a)-(b) illustrate from different angles the principle behind how this embodiment achieves both support and venting effects. Figure 6 (c) is Figure 6 Enlarged schematic diagram of the crater section in (b): As shown in (a) and (b) in the figure, when the PE bag is vacuumed, the product will be pulled from different directions, and the gas will be discharged from the gap between the gasket and the crater.

[0056] In summary, the gasket and protective device for the crater-shaped shell of this invention have the following advantages: This invention constructs a gasket whose shape mimics the crater. The size of the gasket allows it to form a gap with the inner wall of the crater when placed inside. The gasket is made of heat-resistant material and can be applied to the subsequent CIP process. The gasket is rigid, providing support to the crater when placed inside, resisting the pulling force applied to the crater during the vacuuming process. Furthermore, the gasket is elastic and has venting properties, allowing it to compress elastically with the crater and release the gas generated during its contraction. Thus, this invention can prevent the crater from cracking under stress during vacuuming, effectively improving the yield of vacuum packaging and the CIP process. Simultaneously, the protective device of this invention only requires a rigid fixing plate, effectively reducing packaging weight and thickness, and increasing production capacity.

[0057] It should be noted that the terms "vertical," "horizontal," and similar expressions used in this article are for illustrative purposes only.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0059] The terms "first," "second," and other ordinal numbers used in this specification are used to describe various constituent elements, but these constituent elements are not limited by these terms. The purpose of using these terms is solely to distinguish one constituent element from others. For example, without departing from the scope of the invention, a first constituent element may be named a second constituent element, and similarly, a second constituent element may be named a first constituent element.

[0060] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0061] Similarly, it should be understood that, in order to simplify this disclosure and aid in understanding one or more of the various aspects of the invention, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof. However, this disclosure should not be construed as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as reflected in the following claims, inventive aspects lie in fewer than all features of a single foregoing disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into this detailed description, wherein each claim itself is a separate embodiment of the invention.

[0062] It should be noted that the above embodiments are illustrative of the invention and not restrictive, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.

[0063] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A gasket for use in the vacuuming process of a blank with a crater-shaped shell, characterized in that, The gasket is shaped to resemble the crater, and its size is such that when placed inside the crater, it forms a gap with the inner wall of the crater. The gasket is made of heat-resistant and rigid material and is used to provide support for the crater when placed inside it to resist the pulling force generated by the vacuum negative pressure. The gasket is elastic and has venting properties, and is used to elastically compress synchronously with the crater and to vent the gas generated when the crater contracts.

2. The gasket according to claim 1, characterized in that, The gasket surface is provided with venting grooves.

3. The gasket according to claim 2, characterized in that, The exhaust channel is grid-shaped and is formed by the intersection of multiple spaced first strip channels and multiple spaced second strip channels.

4. The gasket according to claim 3, characterized in that, The first groove extends in a direction parallel to the direction of the maximum radial dimension of the crater, and the second groove extends in a direction parallel to the direction of the minimum radial dimension of the crater. The spacing between the first strip grooves is smaller than the spacing between the second strip grooves.

5. The gasket according to claim 1, characterized in that, The gasket is composed of multiple independent, separate structures arranged side by side, with the side-by-side orientation of the multiple separate structures perpendicular to the depth direction of the crater.

6. The gasket according to claim 5, characterized in that, The joint surfaces between adjacent modular structures are inclined.

7. The gasket according to claim 5, characterized in that, The side-by-side orientation of the multiple split structures is consistent with the direction of the maximum radial dimension of the crater.

8. The gasket according to claim 7, characterized in that, The circumferential sidewall between the bottom and top surfaces of the gasket is an inclined surface, and the dimension of the edge contour of the bottom surface of the gasket is larger than the dimension of the edge contour of the top surface of the gasket.

9. The gasket according to claim 1, characterized in that, The gasket is made of bakelite.

10. A protective device made of a shell with a crater, characterized in that, include: The gasket as described in any one of claims 1-9; An inner soft insulating pad is used to enclose the shell blank filled with the pad; A rigid fixing plate is used to place the shell blank that covers the soft insulating pad, and to keep the crater protruding side facing away from the rigid fixing plate; An outer soft insulating pad is used to wrap the rigid fixing plate and the shell blank placed thereon.

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