CN223868531U - Protective devices are made from gaskets and a shell with a crater. - Google Patents

Abstract

The utility model discloses a gasket and a protective device for manufacturing a shell with a crater, wherein the shape of the gasket is similar to that of the crater, a gap is formed between the gasket and the inner wall of the crater when the gasket is placed in the crater, the gasket is made of heat-resistant materials 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 the pulling force applied on the crater in a vacuumizing process, the gasket has elasticity and has exhaust performance, the gasket can be synchronously and elastically compressed along with the crater and can guide out gas generated when the crater is contracted, so that the utility model can prevent the crater from being stressed to crack when vacuumizing and can effectively improve the yield of vacuum package and the yield of cold isostatic pressing process.

Description

Gasket and shell manufacturing protection device with volcanic vent

Technical Field

The utility model relates to a gasket and a protective device for manufacturing a volcanic shell.

Background

The mobile phone backboard is a ceramic product with an arc-shaped crater, and one side of the mobile phone backboard is concave, and the other side of the mobile phone backboard is convex corresponding to the concave, so that the arc-shaped crater is formed. The specific process flow of the product manufacturing comprises the steps of firstly, dry pressing, namely, the product after the dry pressing procedure is a ceramic blank formed by combining powder under the action of pressure and by virtue of internal friction, so that a layer of sponge is generally wrapped on the outer surface of the ceramic blank, then, placing the ceramic blank into a PE (Polyethylene) bag, placing the PE bag into a vacuum machine for vacuum sealing, and finally, fixing the sealed dry pressed ceramic blank through simple assembly of two aluminum plates, and placing the dry pressed ceramic blank into a CIP (Cold Isostatic Pressing ) furnace for CIP after being fixed by rubber bands as shown in (a) of fig. 1. Referring to fig. 1, fig. (b) shows that the aluminum plate on the convex side corresponding to the product arc-shaped crater is completely empty, and fig. (c) shows that the aluminum plate on the concave side corresponding to the product arc-shaped crater is hollowed out to balance CIP pressure. Since the dry pressed ceramic green sheets are fixed by means of aluminum plate assembly, there are problems as follows:

(1) Because the arc-shaped volcanic vent position of the product cannot be protected, when vacuumizing is performed, the PE bag can be pulled, so that the arc-shaped volcanic vent is easily broken under the condition of no support;

(2) Since the aluminum plate on the concave side is completely wall-empty. In the CIP process, the process parameters are kept for 10min under the pressure of 180-200 MPa, the blank can shrink further under high pressure, but the shrinkage ratio is inconsistent due to the density difference at the arc-shaped position. In the freely contracted state, different parts of the blank can be cracked due to different contraction ratios.

(3) Because two aluminum plates are used, the whole weight reaches more than 500g, the manual operation is difficult, the mass production is not facilitated, and because the whole thickness reaches 13mm after the two aluminum plates are packaged, only products with the quantity of less than 80 sets can be put in a CIP furnace body each time, and the efficiency is lower.

The above information disclosed in this background section is only included to enhance understanding of the background of the disclosure and therefore may contain information that does not form the prior art that is presently known to those of ordinary skill in the art.

Disclosure of utility model

The utility model aims to solve the technical problems that the crater is easy to crack under stress and has low production efficiency in the prior art, and provides a gasket and a protective device for manufacturing a shell with the crater.

The technical scheme adopted for solving the technical problems is as follows:

In one aspect, a gasket is configured for use in a blank evacuation process of a crater-containing shell, the gasket having a contour that approximates the shape of the crater, the gasket being sized so as to form a gap with the inner wall of the crater when placed therein;

The gasket is a heat-resistant material piece and has rigidity and is used for providing supporting force for the crater when being placed in the crater so as to resist pulling force generated by vacuum negative pressure;

The gasket has elasticity and has an exhaust characteristic, is used for synchronously and elastically compressing along with the crater and guiding out gas generated when the crater contracts.

Further, in the gasket of the present utility model, the gasket surface is provided with a vent groove.

Further, in the gasket according to the present utility model, the air vent grooves are formed in a grid shape, and are formed by intersecting a plurality of first bar grooves which are spaced apart from each other and a plurality of second bar grooves which are spaced apart from each other.

Further, in the gasket of the present utility model, the extending direction of the first strip-shaped groove is parallel to the direction of the maximum radial dimension of the crater, and the extending direction of the second strip-shaped groove is parallel to the direction of the minimum radial dimension of the crater;

the first grooves are spaced apart less than the second grooves.

Further, in the gasket according to the present utility model, the gasket is formed by a plurality of independent split structures being spliced side by side, and a side by side direction of the split structures is perpendicular to a depth direction of the crater.

Further, in the gasket according to the present utility model, the split surfaces between the adjacent split structures are inclined.

Further, in the gasket according to the present utility model, the side-by-side direction of the plurality of split structures coincides with the direction of the maximum radial dimension of the crater.

Further, in the gasket according to the present utility model, the circumferential side wall between the bottom surface and the top surface of the gasket is an inclined surface, and the dimension of the edge profile of the bottom surface of the gasket is larger than the dimension of the edge profile of the top surface of the gasket.

Further, in the gasket according to the present utility model, the gasket is made of bakelite.

In two aspects, a protective device for manufacturing a shell with a volcanic vent is constructed, comprising:

A gasket as hereinbefore described;

The inner layer soft isolation pad is used for wrapping shell blanks filled with the gaskets;

The hard fixing plate is used for placing shell blanks which wrap the soft isolation pad, and keeping the convex side of the volcanic vent opposite to the hard fixing plate;

and the outer soft isolation pad is used for wrapping the hard fixing plate and the shell blank placed on the hard fixing plate.

The gasket and the protective device for manufacturing the shell with the crater have the advantages that the gasket is constructed, the shape 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 placed in the crater, the gasket is made of heat-resistant materials and can be applied to a subsequent CIP 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 the pulling force applied to the crater in a vacuumizing process, the gasket has elasticity and has exhaust performance, the gasket can be synchronously and elastically compressed along with the crater and can guide out gas generated when the crater contracts, so that the gasket can prevent the crater from being stressed to crack when vacuumizing and can effectively improve the vacuum packaging yield and the CIP process yield, meanwhile, the protective device only needs one hard fixing plate, can effectively reduce the packaging weight and the packaging yield.

Drawings

For a clearer description of an embodiment of the utility model or of a technical solution in the prior art, the drawings that are needed in the description of the embodiment or of the prior art will be briefly described, it being obvious that the drawings in the description below are only embodiments of the utility model, and that other drawings can be obtained, without inventive effort, by a person skilled in the art from the drawings provided:

FIG. 1 is a schematic illustration of a prior art dry pressed ceramic blank after being fixedly sealed;

FIG. 2 is a schematic three-dimensional structure of a gasket in an embodiment of the utility model;

FIG. 3 is a top view of a shim in accordance with an embodiment of the present utility model;

FIG. 4 is a side view of a shim in accordance with an embodiment of the present utility model;

FIG. 5 is a schematic illustration of an application process for manufacturing a protective device for a housing;

FIG. 6 is a force and air evacuation schematic diagram during evacuation;

wherein, each reference sign in the figure:

The novel plastic gasket comprises a gasket, a split structure, a split surface, a circumferential side wall of the gasket, a first strip-shaped groove, a second strip-shaped groove, a sponge, an aluminum plate, a silica gel cushion block and a PE bag, wherein the split structure is composed of the gasket, the split surface, the circumferential side wall of the gasket, the first strip-shaped groove, the second strip-shaped groove, the sponge, the aluminum plate, the silica gel cushion block and the PE bag.

Detailed Description

Aiming at the defects that a crater is easy to crack under stress and low in production efficiency in the prior art, the utility model provides a gasket and a protective device for manufacturing a crater-containing shell, wherein the gasket is mainly used in a vacuumizing process after blank of the crater-containing shell is dry pressed, the shape of the gasket is simulated to the shape of the crater, the gasket is sized to form a gap between the gasket and the inner wall of the crater when the gasket is placed in the crater, the gasket is made of a heat-resistant material and is rigid, the gasket is used for providing supporting force for the crater when the gasket is placed in the crater to resist pulling force generated by vacuum negative pressure, and the gasket is elastic and has an exhaust characteristic, is used for synchronously and elastically compressing along with the crater and guiding out gas generated when the crater is contracted.

In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. Exemplary embodiments of the present utility model are illustrated in the accompanying drawings. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It should be understood that the embodiments of the present utility model and the specific features in the embodiments are detailed descriptions of the technical solutions of the present utility model, and not limited to the technical solutions of the present utility model, and the embodiments of the present utility model and the technical features in the embodiments may be combined with each other without conflict.

Referring to fig. 2-3, fig. 2 is a schematic three-dimensional structure of a gasket in an embodiment of the present utility model, fig. 3 is a top view of the gasket in an embodiment of the present utility model, and fig. 4 is a side view of the gasket in an embodiment of the present utility model. The gasket provided by the embodiment of the utility model is used for a shell with a volcanic vent, and the shell comprises a first surface and a second surface which are oppositely arranged, wherein the first surface is concave, and the corresponding position of the second surface is convex so as to form the volcanic vent. The housing may be a part of a housing of various electronic devices with a volcanic vent, such as a mobile phone back plate, a flat plate back plate, etc., and the embodiment is described by taking the mobile phone back plate as an example. The shell is made of ceramic materials and is subjected to dry pressing, and the product after the dry pressing process is made of ceramic blanks formed by combining powder under the action of pressure by virtue of internal friction.

Specifically, the shape of the gasket simulates the shape of the crater, i.e. the geometry of the gasket is adapted to the crater structural features. The gasket dimension parameters are optimally designed to ensure that uniform equidistant gaps are formed between the circumferential side wall of the gasket and the inner side wall of the crater when the gasket is assembled inside the crater. The purpose of reserving a gap between the gasket and the crater is to provide a shape space for thermal shrinkage deformation in the subsequent process of the crater. Typically, when the crater structure is in a racetrack configuration, the gasket adopts a similar geometry, the peripheral dimension of which can be reduced by a factor of less than and approaching 1, so that a racetrack-shaped gap band is formed between the peripheral side wall of the gasket and the inner wall of the crater, and the gap width can be controlled within a suitable range. It should be noted that the present utility model has universality to the geometric configuration of the crater structure, and the crater structure is compatible with the conventional geometric configurations of rectangle, ellipse, circle, etc., besides the runway type, and is not limited herein.

In one aspect of the utility model, the gasket is a heat resistant material and is rigid to provide support for the crater when placed therein, providing sufficient support to resist pulling forces generated by vacuum negative pressure during the vacuum packaging process. On the other hand, the gasket has elasticity and has an exhaust characteristic, is used for synchronously and elastically compressing along with the crater, and guiding out gas generated when the crater contracts, so as to prevent the gas from being detained in a gap between the gasket and the blank, and the blank is broken.

In some embodiments, the gasket is made of bakelite, a common name of phenolic plastic, a chemical name of phenolic resin, and thermosetting plastic based on phenolic resin. The phenolic resin has the advantages of toughness improvement, firmness, durability, high hardness, good wear resistance, higher compressive strength, smooth and glossy surface, stable shape, difficult deformation under heating, good cold resistance, difficult combustion, good chemical stability and excellent electrical insulation property. Different from rigid materials such as metal, the bakelite cannot hinder the process of further shrinkage of the ceramic blank under the condition of 180-200 mpa in the CIP process.

The embodiment is applied to the manufacturing process of products, and the technology is required to be kept for 10min under 180-200 MPa in the CIP technology, the ceramic blank product with the original density of 2.98-3.0 g/cm ³ can be further shrunk, the density reaches 3.06-3.08 g/cm ³, the shrinkage ratio of the product in the length-width direction is about 1.026, the shrinkage ratio of the product in the thickness direction is about 1.0098, so that the full-profiling cushion block needs to be designed into a reasonable size, the supporting effect can be achieved in the CIP technology, the collapse of the ceramic product is prevented, a certain gap is reserved, and the ceramic blank cannot crack when the ceramic blank is freely shrunk. Finally, through continuous improvement, the size ratio of the axial dimension of the full-profiling cushion block to the inner side wall of the crater of the ceramic product is confirmed to be 1:1.004, and under the size ratio, the supporting effect can be provided under the condition that the shrinkage of the ceramic blank is not influenced. In some embodiments, after the fully contoured pad designed according to the proportion is placed on a volcanic vent of a ceramic product, the yield is kept above 90% in a subsequent CIP process, and the method has feasibility of mass production.

The peripheral side wall between the bottom and top surfaces of the gasket may be a cylindrical surface parallel to the inner side wall of the crater, and in some embodiments the peripheral side wall between the bottom and top surfaces of the gasket may also be an inclined surface, the edge profile of the bottom surface of the gasket having a dimension greater than the edge profile of the top surface of the gasket, where the top and bottom surfaces of the gasket are opposed, the top surface of the gasket being substantially flush with the first face of the housing, the bottom surface of the gasket resting in the crater.

Because the gasket is covered with a material such as sponge during actual vacuum, in some embodiments, the surface (i.e., top surface) of the gasket is further provided with a vent groove, which can allow clearance for shrinkage of the ceramic blank to vent, preventing formation of a gas pocket. The shape of the air vent groove is not limited, for example, the air vent groove may be in a grid shape, and the air vent groove is formed by intersecting a plurality of first strip-shaped grooves distributed at intervals and a plurality of second strip-shaped grooves distributed at intervals.

Based on the structural feature that the crater is track-shaped in the present embodiment, it is recommended to preferentially set the extending direction of the first bar-shaped groove to be parallel to the direction of the maximum radial dimension of the crater, while keeping the extending direction of the second bar-shaped groove parallel to the direction of the minimum radial dimension of the crater, according to the stress distribution characteristic of the track-shaped structure. The space between the first strip-shaped grooves is designed to be smaller than the space between the second strip-shaped grooves in consideration of the difference of stress bearing, and the layout scheme can effectively optimize the mechanical property of the structure.

Further, in some embodiments, the gasket is formed by combining a plurality of independent split structures side by side, where the plurality includes two and more than two.

The side-by-side direction of the split structures is perpendicular to the longitudinal depth direction of the crater or is in an orthogonal relationship with the longitudinal depth direction of the crater. The side-by-side direction of the plurality of split structures is a horizontal direction, which is understood to be a direction parallel to the surface of the housing, and the depth direction of the crater is a direction perpendicular to the surface of the housing. The gasket adopts split type design, can realize self-adaptation reset based on inertial mechanics principle in the assembly process, effectively avoid the influence of processing precision fluctuation and artifical positioning deviation to assembly quality.

Further, the side-by-side direction of the split structures is consistent with the direction of the maximum radial dimension of the crater, and the splicing surfaces between the adjacent split structures are inclined, so that the split structures can be conveniently placed into the crater. Further, the split surface may be either a flat surface or a wavy curved surface.

Based on the same conception, the utility model also discloses a protective device for manufacturing the shell with the volcanic vent, which comprises the gasket, an inner soft isolation pad and an outer soft isolation pad. The inner soft isolation pad is used for wrapping shell blanks filled with the gaskets. The hard fixing plate is used for placing shell blanks which wrap the soft isolation pad. The outer soft isolation pad is used for wrapping the hard fixing plate and the shell blank placed on the hard fixing plate.

Taking the case as an example of a mobile phone backboard product, the inner soft isolation pad can be made of sponge with the thickness of about 1.2mm, the hard fixing plate is specifically made of aluminum plate with the thickness of about 6mm, and the outer soft isolation pad can be made of a 1.5mm silica gel cushion block.

The sponge has the function of buffering and protecting products in the vacuumizing process. In addition, the ceramic product can not be in direct contact with the aluminum plate, and because the ceramic product can further shrink under the pressure of 180-200 MPa in CIP equipment, the direct contact with the aluminum plate can enable the surfaces of the ceramic product and the aluminum plate to form negative pressure, so that the ceramic product and the aluminum plate can not be separated. The sponge has high compression ratio, high extensibility and high rebound property, and can play a good role in separation and protection.

The aluminum plate has the function of vacuumizing the PE bag to shrink during vacuum packaging, and has the function of supporting and protecting ceramic products. The aluminum plate is used as a metal material and has the characteristic of higher strength, but the density is only 2.69g/cm ³, which is about one third of the density of common steel material of 7.85g/cm ³, and the manual operation is easier. In addition, a compact aluminum oxide surface layer can be formed on the surface of aluminum by itself, so that the aluminum alloy has very high oxidation resistance and does not need to be subjected to coating protection.

The main component of the silica gel cushion block is silicon dioxide, which has an amorphous structure and stable chemical property. First, silica gel has low surface activity and is physiologically inert. The silica gel is used as a semi-inorganic polymer material, does not have active compounds, can achieve the performances of fire resistance, flame retardance and ageing resistance after special modification, can achieve the purposes of environmental protection, no toxicity and no smell after being vulcanized in a factory, and is basically harmless to the environment and human bodies. Due to the flexibility of the silica gel molecular chain, the adhesive has good lubricating, anti-sticking, hydrophobic defoaming and other excellent characteristics. Then, the silica gel has compression set resistance. The silica gel has good compression deformation resistance under severe environment at high temperature of 250 ℃ or low temperature of-60 ℃, can keep a good stable state, and can play a role in wrapping and protecting the aluminum plate under the negative pressure extrusion in a vacuumizing process and the pressure of 180-200 MPa in a CIP process so as to prevent the aluminum plate from scratching the PE bag at the outermost layer. Finally, the silica gel has strong oxidation resistance, and the main chain of the silica gel has no double bond, so the silica gel is not easy to be degraded by external ozone, ultraviolet rays and the like, has good radiation resistance, can be repeatedly used outdoors for a long time, and has low cost.

The following describes a process of manufacturing the protection device for the casing, which is applied to the production of the mobile phone ceramic backboard. The whole set of production process of the product mainly comprises dry pressing, vacuum packaging, CIP, CNC, degreasing, sintering, HIP and annealing. In this embodiment, after dry pressing, ceramic blanks are obtained, wherein reference numerals 3, 4, 5 and 6 in fig. 5 respectively represent a sponge, an aluminum plate, a silica gel cushion block and a vacuum bag (such as a PE bag), a split gasket structure 11 is placed in a groove corresponding to a volcanic mouth on the back of a ceramic product, a split gasket structure 12 is placed in the groove on the back of the ceramic blank, the split gasket structures 11 and 12 are jointly spliced to form the gasket, a piece of sponge is used for wrapping the combination in (a), a piece of flat aluminum plate is placed under the sponge, the volcanic mouth is kept protruding and away from the aluminum plate, namely the first surface of the product faces the aluminum plate and the second surface faces away from the aluminum plate, as shown in fig. 5 (d), a piece of silica gel cushion is used for wrapping the combination in (c), and finally the combination is placed in the PE bag for vacuum sealing.

The reason for this embodiment to achieve the support and venting effect is shown from different angles with reference to fig. 6 (a) - (b), and fig. 6 (c) is an enlarged schematic view of the crater portion of fig. 6 (b), where the PE bag pulls the product from different directions when the PE bag is evacuated, and the gas is vented from the gap between the gasket and the crater, as shown in fig. (a) - (b).

In summary, the gasket and the protective device for producing the shell with the crater have the advantages that the gasket is constructed to have the shape which imitates the shape of the crater, the gasket is sized to form a gap between the gasket and the inner wall of the crater when the gasket is placed in the crater, the gasket is made of heat-resistant materials and can be applied to the subsequent CIP process, the gasket has rigidity which can provide supporting force for the crater when the gasket is placed in the crater so as to resist the pulling force applied on the crater in the vacuumizing process, the gasket has elasticity and has air exhausting performance, can be synchronously and elastically compressed along with the crater and can guide out air generated when the crater is contracted, so that the gasket can prevent the crater from being stressed to crack when vacuumizing, and can effectively improve the yield of vacuum package and the CIP process.

It is noted that the terms "vertical," "horizontal," and the like are used herein for illustrative purposes only.

Unless defined otherwise, 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 utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

The terms including ordinal numbers such as "first", "second", and the like used in the present specification may be used to describe various constituent elements, but these constituent elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first component may be termed a second component, and, similarly, a second component may be termed a first component, without departing from the scope of the present invention.

In the description provided herein, numerous specific details are set forth. However, it is 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 in order not to obscure an understanding of this description.

Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. This method of disclosure, however, is not to be interpreted as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.

It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design 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.

The embodiments of the present utility model have been described above with reference to the accompanying drawings, but the present utility model is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present utility model and the scope of the claims, which are to be protected by the present utility model.

Claims (10)

1. A gasket for use in a blank evacuation process of a crater-containing shell, wherein the gasket has a contour that approximates the shape of the crater, the gasket being sized so that a gap is formed between the gasket and the inner wall of the crater when the gasket is placed in the crater;

The gasket is a heat-resistant material piece and has rigidity and is used for providing supporting force for the crater when being placed in the crater so as to resist pulling force generated by vacuum negative pressure;

The gasket has elasticity and has an exhaust characteristic, is used for synchronously and elastically compressing along with the crater and guiding out gas generated when the crater contracts.

2. The gasket of claim 1 wherein the gasket surface is provided with a vent groove.

3. The gasket of claim 2 wherein the vent grooves are in the form of a grid formed by a plurality of spaced apart first grooves intersecting a plurality of spaced apart second grooves.

4. A gasket according to claim 3, wherein the first elongate slot extends in a direction parallel to the direction of maximum radial dimension of the crater and the second elongate slot extends in a direction parallel to the direction of minimum radial dimension of the crater;

the first grooves are spaced apart less than the second grooves.

5. The gasket of claim 1 wherein said gasket is formed by a plurality of individual split structures joined side-by-side, the side-by-side direction of said split structures being perpendicular to the depth direction of said crater.

6. The gasket of claim 5 wherein the mating surfaces between adjacent ones of said split structures are sloped.

7. The gasket of claim 5 wherein the side-by-side orientation of a plurality of said split structures coincides with the direction of the maximum radial dimension of said crater.

8. The gasket of claim 7 wherein the peripheral side wall between the bottom and top surfaces of the gasket is an inclined surface and the edge profile of the bottom surface of the gasket has a dimension that is greater than the dimension of the edge profile of the top surface of the gasket.

9. The gasket of claim 1 wherein said gasket is made of bakelite.

10. A protective device for a crater-equipped shell, comprising:

a gasket according to any of claims 1 to 9;

The inner layer soft isolation pad is used for wrapping shell blanks filled with the gaskets;

The hard fixing plate is used for placing shell blanks which wrap the soft isolation pad, and keeping the convex side of the volcanic vent opposite to the hard fixing plate;

and the outer soft isolation pad is used for wrapping the hard fixing plate and the shell blank placed on the hard fixing plate.