CN212218816U - Graphite mold for hot-pressed sintered equal-arc-surface ceramic bulletproof plate - Google Patents
Graphite mold for hot-pressed sintered equal-arc-surface ceramic bulletproof plate Download PDFInfo
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- CN212218816U CN212218816U CN202020449934.4U CN202020449934U CN212218816U CN 212218816 U CN212218816 U CN 212218816U CN 202020449934 U CN202020449934 U CN 202020449934U CN 212218816 U CN212218816 U CN 212218816U
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Abstract
The utility model discloses a cambered surface pottery such as hot pressing sintering bulletproof plate graphite jig for, include: the middle part of the mould cylinder is provided with a mould cavity, and the cross section shape of the mould cavity is consistent with the outline shape of the bulletproof plate to be sintered; the partition plates are arranged on the cross section of the die cavity, and each partition plate is a multi-curved-surface body formed by intersecting arc surfaces with the same curvature radius and different circle centers; the upper pressure head and the lower pressure head are respectively arranged at two ends of the die cavity; the working surfaces of the upper pressure head and the lower pressure head are concave surfaces or convex surfaces, and the concave-convex directions of the working surfaces of the upper pressure head and the lower pressure head are opposite; the concave working surface is consistent with the concave surface of the partition board in shape and size, and the convex working surface is consistent with the convex surface of the partition board in shape and size.
Description
Technical Field
The utility model belongs to ceramic forming die field, concretely relates to cambered surface pottery such as hot pressing sintering bulletproof plate graphite jig for.
Background
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information constitutes prior art that is already known to a person skilled in the art.
The bulletproof harness for protecting human bodies is generally formed by compounding an inner layer of a ceramic bulletproof inserting plate and a high polymer material of which the outer layer is wrapped by the ceramic bulletproof inserting plate. The outer layer of polymeric material can increase the wearing comfort of the bulletproof harness and protect the human body from being damaged by ceramic fragments, but the quality of the bulletproof ceramic is decisive for the bulletproof performance.
The uniformity of the quality stability and the overall performance of the ceramic armor has an important influence on the effectiveness and reliability of the ballistic performance of the ceramic armor, and if the density distribution of the ceramic armor is not uniform, serious casualties can be caused when bullets just hit a low-density area of the armor. At present, the common bulletproof ceramics for human body protection are mainly boron carbide and silicon carbide ceramics. Although many reports have been made on the pressureless sintering technology of boron carbide ceramics, the main sintering method of boron carbide bulletproof ceramics is hot-pressing sintering at present.
The hot-pressing sintering can prepare almost completely compact ceramics, so that the ceramic has high hardness, high strength and good bulletproof capability. However, hot press sintering can only produce products of simple shapes such as thin flat plates, cylinders, etc., and of dimensions limited by the furnace body. For the multi-curved surface armor that army equipment needs, because there is the curved surface of vertical and radial different radians, when adopting current hot pressing sintering mould to carry out hot pressing sintering, often the product of sintering can warp and can not reach the requirement of design, and the rejection rate is high even can not produce qualified product, more can not use the hot pressing sintering grinding apparatus to realize the hot pressing sintering simultaneously of multi-curved surface armor.
Disclosure of Invention
In order to solve the technical problem that exists among the prior art, the utility model aims at providing a hot pressing sintering isopipe pottery graphite mold for armor.
In order to solve the above technical problem, one or more embodiments of the present invention provide the following technical solutions:
a hot pressing sintering isopar ceramic bulletproof plate graphite mold, comprising:
the middle part of the mould cylinder is provided with a mould cavity, and the cross section shape of the mould cavity is consistent with the outline shape of the bulletproof plate to be sintered;
the partition plates are arranged on the cross section of the die cavity and are attached to the inner wall of the die cavity, and each partition plate is a multi-curved-surface body formed by intersecting arc surfaces with the same curvature radius and different circle centers;
the upper pressure head and the lower pressure head are respectively arranged at two ends of the die cavity;
the working surfaces of the upper pressure head and the lower pressure head are concave surfaces or convex surfaces, and the concave-convex directions of the working surfaces of the upper pressure head and the lower pressure head are opposite; the concave working surface is consistent with the concave surface of the partition board in shape and size, and the convex working surface is consistent with the convex surface of the partition board in shape and size.
Compared with the prior art, the utility model discloses a beneficial effect of above embodiment does:
the baffle is by having the same radius of curvature, the many curved surface body that the cambered surface of different centre of a circle is crossing and is formed, go up the indent working face of pressure head and lower pressure head and the interior concave surface shape and the size of baffle unanimous, the evagination working face is unanimous with the evagination face shape and the size of baffle, make when last pressure head, a plurality of baffles and lower pressure head superpose according to the laying order when hot pressing sintering and place, each contact surface all can closely laminate, namely, can apply even effort to the bulletproof board body in the sintering process, the density distribution of ceramic bulletproof board after guaranteeing the sintering is even, and bulletproof board can not take place deformation in hot pressing sintering process, quality and the yield of equal curved surface bulletproof board can effectively be improved.
The quantity of baffle is a plurality of, all can place bulletproof plate ceramic body between the adjacent baffle, promptly, adopts a mould just can carry out hot pressing sintering to a plurality of bulletproof plates simultaneously, can effectively improve dress fever efficiency, reduction in production cost.
Drawings
The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention.
Fig. 1 is a schematic structural view of an outer sleeve of a graphite mold according to an embodiment of the present invention after assembly;
fig. 2 is a schematic top view of a graphite mold according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a front view of a graphite mold according to an embodiment of the present invention;
FIG. 4 is a schematic sectional view along the line A-A in FIG. 3;
fig. 5 is a schematic structural view of a lower pressing head of a graphite mold according to an embodiment of the present invention;
fig. 6 is an isometric view of a lower pressure head of a graphite mold according to an embodiment of the present invention;
fig. 7 is a schematic structural view of a top view of a lower press head of a graphite mold according to an embodiment of the present invention;
fig. 8 is a left side view structural schematic diagram of a lower pressing head of the graphite mold according to the embodiment of the present invention;
fig. 9 is a schematic structural view of a front view of an upper pressing head of a graphite mold according to an embodiment of the present invention;
fig. 10 is a schematic structural view of an isometric view of a pressing head on a graphite mold according to an embodiment of the present invention;
fig. 11 is a schematic structural view of a top view of a pressing head on a graphite mold according to an embodiment of the present invention;
fig. 12 is a left side view structural schematic diagram of the upper press head of the graphite mold according to the embodiment of the present invention;
fig. 13 is a schematic structural view of a middle partition plate of a graphite mold according to an embodiment of the present invention;
fig. 14 is a schematic top view of a graphite mold intermediate bottom plate according to an embodiment of the present invention.
In the figure, 1, a mold cavity, 2, a graphite block, 3, an upper pressure head, 4, a graphite partition plate, 5 and a lower pressure head.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. 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 invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
A hot pressing sintering isopar ceramic bulletproof plate graphite mold, comprising:
the middle part of the mould cylinder is provided with a mould cavity, and the cross section shape of the mould cavity is consistent with the outline shape of the bulletproof plate to be sintered;
the partition plates are arranged on the cross section of the die cavity and are attached to the inner wall of the die cavity, and each partition plate is a multi-curved-surface body formed by intersecting arc surfaces with the same curvature radius and different circle centers;
the upper pressure head and the lower pressure head are respectively arranged at two ends of the die cavity;
the working surfaces of the upper pressure head and the lower pressure head are concave surfaces or convex surfaces, and the concave-convex directions of the working surfaces of the upper pressure head and the lower pressure head are opposite; the concave working surface is consistent with the concave surface of the partition board in shape and size, and the convex working surface is consistent with the convex surface of the partition board in shape and size.
The middle part of the mould cylinder body is a hot-pressing mould cavity, the shape of the cross section of the hot-pressing mould cavity needs to be consistent with that of the ceramic bulletproof plate, and the external shape of the mould cylinder body does not have special requirements, for example, the mould cylinder body can be cylindrical, prismatic or other irregular shapes. In order to ensure that the stress capacities of all parts of the die cylinder are consistent, the die cylinder is set to be of an equal-wall-thickness structure, and is preferably cylindrical.
The material of the mould cylinder is generally graphite, in order to prepare the high-quality ceramic bulletproof plate, the peripheral side surfaces of the partition plate need to be tightly attached to the side wall of the mould cylinder, so that a problem occurs, if the mould cylinder is of an integrated structure, on one hand, the loading before hot-pressing sintering is difficult to realize, the dislocation of the partition plate and a blank body is easy to occur during loading, and the loading precision is difficult to ensure; on the other hand, the unloading after the hot-pressing sintering is more difficult to realize. Therefore, the mold cylinder needs to be arranged into a split structure, namely the mold cylinder is formed by splicing two or more graphite blocks.
Preferably, in some embodiments, the mold cylinder is a split structure and is formed by splicing two or more graphite blocks.
Further, two or more graphite blocks are distributed in the circumferential direction of the die cylinder.
Each graphite block distributes in the circumference of mould barrel, and promptly, the length of every graphite block is the same with the length of mould barrel, and the cross section of each graphite block is the same with the shape of the cross section of mould barrel after the concatenation. When adopting this kind of setting mode, can overlap lower pressure head, last pressure head, baffle and body according to this order earlier, the stack order is: lower ram-billet-diaphragm- … … billet-upper ram. After the superposition is finished, the graphite blocks are surrounded and spliced from the periphery of the superposition body, so that high-quality charging is realized.
Furthermore, the number of graphite blocks is 2-4. If the number of the graphite blocks is 2, 3 or 4, the number of the graphite blocks is too large, the number of the splicing parts is increased, on one hand, the splicing difficulty is improved, and on the other hand, the graphite blocks are easy to damage.
Still further, the number of graphite blocks is 4.
And furthermore, limiting grooves matched with each other are machined at the outer edge of each graphite block.
Not only convenient to position and assemble, but also favorable for tight combination and preventing raw materials from overflowing during hot pressing.
In some embodiments, the spacer is thin in the middle and thick at the edges.
The equal-radian bulletproof plate prepared by adopting the structure is thick in the middle and slightly thin at the edge, so that the quality of the bulletproof plate can be reduced while the protection effect of the core part of a human body is not reduced, the load of personnel is reduced, and the wearing comfort is improved.
In some embodiments, the working surface of the upper ram is a concave surface and the opposite surface of the working surface is a flat surface.
The working surface of the upper pressure head is the surface which is contacted with the green body and is used for pressing the green body to carry out hot-pressing sintering. The opposite face of this working face is the one side of bearing external pressure promptly, sets up this side into the plane, can effectively improve the homogeneity of pressure head atress.
Furthermore, the working surface of the lower pressure head is an outer convex surface, and the opposite surface of the working surface is a plane.
The working surface of the lower pressure head is the surface which is in contact with the green body and is used for pressing the green body to perform hot-pressing sintering, the opposite surface of the working surface is the bottom supporting surface, and the side is set to be a plane, so that the stability of the hot-pressing sintering process can be effectively improved.
In some embodiments, the inner wall of the mold cylinder is smoothly disposed.
Example 1:
as shown in fig. 1, 2 and 3, the graphite mold for the hot-pressing sintering equal-arc-surface ceramic bulletproof plate comprises a graphite mold cavity, a lower pressing head of the graphite mold, an intermediate graphite partition plate and an upper pressing head of the graphite mold. The graphite sleeve has a diameter of 800mm and a height H of 1200mm, wherein the four graphite blocks respectively occupy 1/4 of the outer cylinder and have the same outer shape dimension.
Fig. 2 is a top view of a graphite mold cylinder, wherein the mold cavity dimensions are: l1 is 260mm, the side length L2 is 380mm, L3 is 50mm, L4 is 70mm, R1-20 mm, R2-30 mm, R3-20 mm.
In FIG. 3, a is the thickness of the middle part of the guard plate, and the size is 10 mm; b is the thickness of the edge of the guard plate, and the size of the guard plate is 9.8 mm; a1 is the thickness of the middle part of the clapboard, and the size is 14.8 mm; b1 is the thickness of the edge of the baffle, and its dimension is 15mm, A is the width of the guard plate, and its dimension is 260 mm.
In FIG. 4, a is the thickness of the middle part of the guard plate, and the size is 10 mm; b is the thickness of the edge of the product, and the size of the product is 9.8 mm; a1 is the thickness of the middle part of the clapboard, and the size is 14.8 mm; b1 is the thickness of the edge of the baffle, and its size is 15mm, B is the height of the guard plate, and its size is 320 mm. The height H is 1200 mm. The thickness of the middle graphite clapboard is 30mm at the center and 27.5mm at the edge.
In FIG. 5, the lower head of the graphite mold has a side length L1 of 260mm, a side length L2 of 380mm, two upper chamfers of L3 of 50mm and L4 of 70 mm.
In fig. 7, the lower ram R2 is 1225mm, and in fig. 8, R1 is 625 mm.
In fig. 9, the upper indenter of the graphite mold has a side length L1 of 260mm, a side length L2 of 380mm, two cut lengths of the upper chamfer R1 of 50mm in L3, 70mm in L4 and a thickness of 50mm at the center. In fig. 11 and 12, R4 ═ 1225mm and R5 ═ 625 mm.
Fig. 13 is a front view of a graphite separator, in which L1 is 260mm, the side length L2 is 380mm, L3 is 50mm, L4 is 70mm, R1 is 20mm, R2 is 30mm, and R3 is 20 mm.
Fig. 14 is a schematic top view of a partition, which is formed by intersecting two curved surfaces, wherein R6 is the radius of the bottom curved surface and has a size of 320mm, and R7 is the radius of the upper curved surface and has a size of 630 mm.
The application process of the graphite mold is explained by taking the boron carbide ceramic hot press molding as an example.
1. Putting the graphite lower pressure head into a hot pressing furnace;
2. assembling the graphite outer sleeve in place in a hot pressing furnace by taking the lower pressure head as a reference (or assembling the graphite outer sleeve after stacking the boron carbide ceramic green body and the graphite partition plate);
3. putting a prepressed boron carbide ceramic green body, wherein the radian of the green body is the same as that of the upper surface of the lower pressure head;
4. putting an intermediate graphite partition plate;
5. then putting a prepressed boron carbide ceramic green body, and then putting an intermediate graphite partition plate; according to production requirements, combining the height of the die and the thickness of the product, repeating the operation, and filling proper amount of boron carbide ceramic green bodies;
6. covering a graphite upper pressure head;
7. heating and heating according to a sintering schedule to finish the hot-pressing sintering process;
8. after the temperature of the hot pressing furnace is reduced, the hot pressing furnace is taken out, and the graphite upper pressing head, the boron carbide ceramic bulletproof plate and the intermediate partition plate are taken out in sequence until the graphite upper pressing head, the boron carbide ceramic bulletproof plate and the intermediate partition plate are taken out completely;
9. and the used graphite mould assembly is regularly stored for later use.
By adjusting the size of the mould, the graphite mould for the hot-pressed sintered equal-arc-surface ceramic bulletproof plate with different geometric sizes can be obtained.
The prepared equal-arc-surface ceramic bulletproof plate is a hyperboloid structure formed by intersecting two curved surface bodies with the same curvature radius and different circle centers, the intersecting position is smoothly arranged, and the middle of the ceramic bulletproof plate is thick and the edge of the ceramic bulletproof plate is thin.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a cambered surface pottery such as hot pressing sintering is graphite jig for armor which characterized in that: the method comprises the following steps:
the middle part of the mould cylinder is provided with a mould cavity, and the cross section shape of the mould cavity is consistent with the outline shape of the bulletproof plate to be sintered;
the partition plates are arranged on the cross section of the die cavity, and each partition plate is a multi-curved-surface body formed by intersecting arc surfaces with the same curvature radius and different circle centers;
the upper pressure head and the lower pressure head are respectively arranged at two ends of the die cavity;
the working surfaces of the upper pressure head and the lower pressure head are concave surfaces or convex surfaces, and the concave-convex directions of the working surfaces of the upper pressure head and the lower pressure head are opposite; the concave working surface is consistent with the concave surface of the partition board in shape and size, and the convex working surface is consistent with the convex surface of the partition board in shape and size.
2. The graphite mold of claim 1, wherein: the mould barrel is of a split structure and is formed by splicing two or more graphite blocks.
3. The graphite mold of claim 2, wherein: two or more graphite blocks are distributed in the circumferential direction of the die cylinder.
4. The graphite mold of claim 3, wherein: the number of graphite blocks is 2-4.
5. The graphite mold of claim 4, wherein: the number of graphite blocks is 4.
6. The graphite mold of claim 3, wherein: the outer edge of each graphite block is provided with a limiting groove which is matched with each other.
7. The graphite mold of claim 1, wherein: the middle of the clapboard is thick, and the edge of the clapboard is thin.
8. The graphite mold of claim 1, wherein: the working surface of the upper pressure head is an inner concave surface, and the opposite surface of the working surface is a plane.
9. The graphite mold of claim 8, wherein: the working surface of the lower pressure head is an outer convex surface, and the opposite surface of the working surface is a plane.
10. The graphite mold of claim 1, wherein: the inner wall of the mould cylinder is smoothly arranged.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020449934.4U CN212218816U (en) | 2020-03-31 | 2020-03-31 | Graphite mold for hot-pressed sintered equal-arc-surface ceramic bulletproof plate |
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| CN202020449934.4U CN212218816U (en) | 2020-03-31 | 2020-03-31 | Graphite mold for hot-pressed sintered equal-arc-surface ceramic bulletproof plate |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113340119A (en) * | 2021-03-30 | 2021-09-03 | 浙江领崎科技有限责任公司 | Burning-bearing die of ceramic protection plate |
| CN113340120A (en) * | 2021-03-30 | 2021-09-03 | 浙江领崎科技有限责任公司 | Ceramic protection plate's device that holds fever |
-
2020
- 2020-03-31 CN CN202020449934.4U patent/CN212218816U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113340119A (en) * | 2021-03-30 | 2021-09-03 | 浙江领崎科技有限责任公司 | Burning-bearing die of ceramic protection plate |
| CN113340120A (en) * | 2021-03-30 | 2021-09-03 | 浙江领崎科技有限责任公司 | Ceramic protection plate's device that holds fever |
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