JP4538798B2 - Composite protective plate - Google Patents

Description

  The present invention relates to a composite protective plate for protecting against scattered objects.

  The need for protection from projectiles from bullets or explosions is increasing year by year. There are two types of protection: a method of protecting with a protective plate using a material that is not destroyed by scattered objects, and a method of protecting with a protective plate that does not lead to a large destruction even if destroyed by scattered objects. In the former case, it is necessary to select a material that is harder and stronger than any scattered material as the material of the protective plate. Therefore, it is difficult to adopt in applications where a wide variety of flying objects are assumed. In addition, since materials with both hardness and toughness (toughness) are rare, there is a problem that costs increase. For this reason, the latter method is often adopted. For example, bulletproof glass, bulletproof vests, etc. adopt such a method.

  Conventionally, various protective plates have been developed. For example, as a composite protective plate made of resin and ceramics, a structure in which a ceramic plate is disposed on the surface of fiber reinforced plastic (FRP) is known (see Patent Document 1). With such a structure, it is expected that bulletproof performance and blade-proof performance will be further improved as compared with FRP alone.

A surface layer comprising a plurality of adjacent ceramic surface layer segments facing the impact surface, laminated on the first sublayer and in contact with each other, and the impact surface; There is also known a composite armor plate material comprising at least a back layer facing in the opposite direction and a support layer disposed between the surface layer and the back layer (see Patent Document 2). With such a structure, it is possible to improve the protection performance to some extent.
JP 2002-316319 A (Claims) Japanese translation of PCT publication No. 2003-532561 (Claims)

  However, in the invention disclosed in Patent Document 1 described above, the protection performance by the scattered objects is not necessarily sufficient. Certainly, when the ceramic plate is broken, the kinetic energy of the scattered material such as metal can be absorbed, and the protection by the scattered material can be achieved to some extent. However, if the ceramic plates are simply arranged, sufficient protection cannot be achieved when the kinetic energy of the scattered objects is large.

  Similarly, in the case of the invention disclosed in Patent Document 2, the protective performance cannot be said to be sufficient in a situation where the ceramic plates are arranged in surface contact in the laminated structure. One reason for this is that the kinetic energy of the scattered material propagates over a wide range through the surfaces of the ceramic plates, resulting in a large fracture site and inability to withstand composite impacts or continuous impacts.

  Furthermore, if the broken part is large, the repair is difficult, and once it is damaged by the flying object, it cannot be used again.

  The present invention has been made in view of such problems, and it is an object of the present invention to provide a composite protective plate that effectively disperses the energy of scattered objects to improve the protective performance and facilitate the repair of the destruction site. And

In order to achieve the above object, the present invention provides a plurality of substantially spherical or cylindrical pellets arranged on a plate in contact with each other at six or more points or lines, and between each pellet. the gap, have a structure filled with a low filler hardness than pellets, a convex portion provided on the surface of the pellet, the pellet together, in contact at a site other than the convex portions or the convex portion and the convex portion Therefore, when the scattered object collides with the pellet, a part of the impact is consumed for the deformation of the filler, and the part of the impact is directed toward the surrounding pellet. Propagates in many directions. As a result, the expansion of the fracture region of the pellet can be suppressed. Moreover, the impact given to the pellet is propagated to the surrounding pellet through the convex portion. By providing the convex portion, the contact between the pellets can be ensured, and therefore, the expansion of the fracture region of the pellet can be more effectively suppressed.

In another aspect of the present invention, a plurality of substantially spherical or cylindrical pellets are arranged on a plate in contact with at least six points or lines via small pellets smaller than each pellet. the gaps between the pellets and small pellets, than pellets and small pellets have a buried structure with a low filler hardness, the convex portion provided on the surface of the pellets, the pellets each other, the convex portions or the convex This is a composite protective plate arranged so as to be in contact with a portion other than the convex portion . For this reason, a part of impact applied to the pellet is propagated to the surrounding pellet through the small pellet. As a result, the expansion of the fracture region of the pellet can be suppressed. Moreover, the impact given to the pellet is propagated to the surrounding pellet through the convex portion. By providing the convex portion, the contact between the pellets can be ensured, and therefore, the expansion of the fracture region of the pellet can be more effectively suppressed.

  Another aspect of the present invention is the composite protection plate according to the previous invention, wherein the pellet has a substantially cylindrical shape, and at least one of the two bottom surfaces of the pellet has an outwardly convex shape. It is said. When the pellet surface on the side where the flying object hits is convex, the kinetic energy of the flying object is easily propagated to surrounding pellets other than the collided pellet. For this reason, it can reduce that a scattered material penetrates a composite protection board. In addition, if the pellet surface opposite to the surface on which the flying object hits is made convex, and the plate in contact with the protruding surface of the pellet is made of a soft material, the kinetic energy of the flying object is trapped, reducing the impact between the pellets. it can.

  In another aspect of the present invention, in the previous invention, the pellet is a ceramic sintered body, the plate is a metal plate, the surface of the pellet in contact with the plate is a flat surface, and the surface opposite to the flat surface is a convex shape. It is a composite protective plate with a face. For this reason, a concave portion having a size proportional to the diameter of the pellet is formed on the plate by the impact when the scattered matter collides with the pellet, and the state where the pellet and the plate are in close contact with each other can be maintained. Accordingly, it is possible to alleviate crushing between pellets.

  Another aspect of the present invention is that in the previous invention, the pellet is a ceramic sintered body, the plate is a resin plate, the surface of the pellet in contact with the plate is convex, and the surface opposite to the convex surface Is also a composite protective plate with a convex surface. For this reason, the plate is deformed into a concave shape having a curved surface by an impact. If the contact surface of the pellet is concave, the state where the pellet and the plate are in close contact can be maintained. Accordingly, it is possible to alleviate crushing between pellets.

  Another invention of the present invention is a composite protection plate in which pellets are arranged in a plurality of stages in the height direction from the plate. For this reason, it can reduce that a scattered material penetrates a composite protection board.

  The “substantially spherical shape” includes not only a perfect sphere but also an elliptical sphere. In addition, a sphere or an elliptical sphere having irregularities is substantially included in the category of a sphere as long as it is recognized as a sphere or an elliptical sphere as a whole. The “substantially cylindrical shape” includes not only a perfect cylinder but also an elliptical cylinder. In addition, those having irregularities on the surface of a cylinder or an elliptical column are substantially included in the category of the columnar shape as long as the shape of the columnar or elliptical column is recognized as a whole.

  According to the present invention, the energy of scattered objects can be effectively dispersed to improve the protection performance, and the repair of the fracture site can be facilitated by a simple means of exchanging the fracture pellets. Protective performance that can cope with impact can be maintained. Easiness of exchange is possible because the fracture pellet is in contact with the peripheral pellet at a point or line, and the frictional resistance with the peripheral pellet is small when filling the pellet.

Next, each embodiment of the composite protective plate according to the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a view of a setting state of a plurality of pellets 1 constituting the composite protection plate according to the first embodiment, as viewed from a plate surface direction that receives a collision of scattered objects.

  As shown in FIG. 1, the pellet 1 which comprises the composite protection board concerning 1st Embodiment is arrange | positioned in the state which contacts the surrounding pellet 1 at six points. Further, the gap between the pellets 1 is filled with a filler 2 having a hardness lower than that of the pellets 1. The reason why the composite protective plate is composed of the plurality of pellets 1 is to prevent the entire composite protective plate from being broken and to easily repair only the broken portion.

The pellet 1 constituting the composite protective plate may be made of any material such as ceramic, metal, engineering plastic, wood, etc., but is preferably made of ceramic or metal having excellent strength. The ceramic pellet 1 includes oxide ceramics such as aluminum oxide (Al ₂ O ₃ ), zirconium oxide (ZrO ₂ ), magnesium oxide (MgO), iron oxide (Fe ₂ O ₃ , Fe ₃ O ₄ ), Nitride of carbide ceramics such as silicon carbide (SiC), titanium carbide (TiC), boron carbide (B ₄ C), silicon nitride (Si ₃ N ₄ ), titanium nitride (TiN), hexagonal boron nitride (cBN), etc. Any type of ceramic sintered body of boride ceramics such as physical ceramics, titanium boride (TiB ₂ ), and zirconium boride (ZrB ₂ ) can be used. Moreover, the pellet 1 made from glass and carbon may be sufficient. The metal pellet 1 may be a single metal pellet such as iron, aluminum, lead, or copper, or an alloy pellet such as stainless steel or aluminum alloy.

  As the filler 2, for example, a thermoplastic resin or a thermosetting resin can be employed. As thermoplastic resins, polyethylene (PE), polypropylene (PP), polystyrene (PS), acrylonitrile / styrene resin (AS), acrylonitrile / butadiene / styrene resin (ABS), methacrylic resin (PMMA), vinyl chloride (PVC) , Polyamide (PA), polyacetal (POM), ultra high molecular weight polyethylene (UHPE), polybutylene terephthalate (PBT), GF reinforced polybutylene terephthalate (GF-PBT), polymethylpentene (TPX), polycarbonate (PC), modified Polyphenylene ether (PPE), polyphenylene sulfide (PPS), polyether ether ketone (PEEK), polytetrafluoroethylene (PTFE), polyetherimide (PEI), polyarylate (PA ), Polysulfone (PSF), polyether sulfone (PES), polyamideimide (PAI), and urethane resins. Examples of the thermosetting resin include phenol resin, urea resin, melamine resin, unsaturated polyester resin, alkyd resin, epoxy resin, diallyl phthalate resin, and urethane resin.

  Ideal values for maintaining the flexibility of the filler 2 after curing are hardness 90 to 95 (measurement method: ASTM D-2240), elongation 380 to 420% (measurement method: ASTM D-412), tensile The strength is 2700 to 3000 psi (measurement method: ASTM D-412), and the water absorption is 1.6% (measurement method: ASTM D-570).

  FIG. 2 is a view showing a typical pellet 1 as viewed from the cross-sectional direction of the composite protective plate.

  As the shape of the pellet 1, any of a spherical shape as shown in (2A) and a substantially cylindrical shape as shown in (2B) and (2C) can be adopted. When the shape of the pellet 1 is a spherical shape, the pellets 1 are in point contact with each other. On the other hand, when the pellets 1 are substantially cylindrical, the pellets 1 are in line contact with each other. One of the upper and lower surfaces of the cylindrical pellet 1 is convex. Because the surface where the convex surfaces of the pellet 1 are lined up is the surface that receives the impact of the flying object in the composite protective plate, it can be expected that the kinetic energy of the flying object will be diverted not only to the collided pellet but also around the pellet. is there. One of the criteria for selectively using pellet 1 (2B) having only one convex surface and pellet (2C) having two convex surfaces will be described later.

  FIG. 3 illustrates the force transmitted to the surroundings when a projectile such as a bullet hits the convex surface of the pellet 1. (3A) shows the situation seen from the convex side of the pellet 1, that is, the surface of the composite protective plate, and (3B) shows the situation seen from the side surface of the pellet 1, that is, the cross-sectional direction of the composite protective plate.

  When an impact F such as a bullet is applied to the convex surface of one of the pellets 1 (pellet 1 at the top of the paper surface), part of the pellet 1 is transmitted toward the surface facing the convex surface. Further, a part of the impact F is relaxed by the filler 2, and the rest is transmitted to the neighboring pellets 1 through the tangent line in contact with the pellets 1 as indicated by the white arrows. The impact transmitted to the adjacent pellet 1 is further transmitted to the surrounding pellet 1 through a tangent line in contact therewith. In the tangent line between the pellets 1, the forces transmitted to each other may cancel each other. In this way, a part of the impact F applied to one pellet 1 is dispersed by the number of portions in contact with the surrounding pellet 1 and transmitted to the surrounding pellet 1, so that the impact is not transmitted over a wide area and is limited. It fits inside.

  FIG. 4 is a diagram showing a state of transmission of an impact when an impact F is applied to a protection plate composed of pellets 3 different from the pellets 1 constituting the composite protection plate of the present invention.

  When the columnar pellets 3 having hexagonal surfaces on both upper and lower surfaces are arranged so as to be in surface contact with each other, when an impact F is applied to one of the pellets 3 (pellet 3 on the lower left in the figure), a part of the impact F Is transmitted to the surrounding pellet 3 via the contact surface. However, if they are in contact with each other only on the surface of the pellet 3, the transmission of impact has directionality, and the probability of the destruction of the pellet 3 over a wide range increases. That is, while propagating in the direction of the white arrow in the figure, most of the kinetic energy goes straight in the direction of the hatched arrow, and the probability that the area to be destroyed expands increases. In addition, the structure which fills the clearance gap between pellets 3 with the filler 2 is also considered. However, rather than the propagation of kinetic energy to the surrounding pellets 3, it becomes easier to concentrate only on the pellets 3 to which an impact is applied, and the risk of penetrating the composite protective plate increases. Therefore, even if the pellets 3 are brought into surface contact with each other and the filler 2 is present in the gap between the pellets 33, the performance of the composite protective plate is inferior.

  FIG. 5 is a view showing a composite protective plate including a pellet 1 in which one of the bottom surfaces is convex and the other is a flat surface. (5A) is a partially transparent view seen from the cross-sectional direction of the composite protective plate, (5B) is an enlarged view showing a part of one pellet 1, and (5C) is an impact F applied to a part. It is a figure which shows the change of the composite protection board at the time.

  As shown in (5A), the composite protective plate according to the first embodiment includes a plate 4, a plurality of pellets 1 arranged on the plate 4, and a filler 2 that fills between the pellets 1. Yes. The plate 4 is a metal (including alloy) plate. In this case, it is better to make the contact portion between the pellet 1 and the plate 4 flat. When the pellet 1 to which the impact F has been applied is pushed in the direction of the plate 4 while being broken, the plate 4 is recessed while the bottom portion of the pellet 1 maintains contact with the pellet 1. This is because the pellets 1 can be alleviated from causing a ball hitting phenomenon. At this time, a deformation 4 a having a size proportional to the diameter of the pellet 1 occurs on the plate 4.

  FIG. 6 is a view showing a composite protective plate provided with pellets 1 having both convex bottom surfaces. (6A) is a partially transparent view seen from the cross-sectional direction of the composite protective plate, (6B) is an enlarged view showing a part of one pellet 1, and (6C) is an impact F applied to a part. It is a figure which shows the change of the composite protection board at the time.

  The plate 4 of the composite protective plate shown in FIG. 6 is a resin plate. In this case, the contact portion between the pellet 1 and the plate 4 should be curved. When the pellet 1 to which the impact F is applied is pushed in the direction of the plate 4 while being broken, the plate 4 is recessed in a hemispherical shape downward in the figure. This is because the contact surface of the pellet 1 is also convex, so that the contact between the pellet 1 and the plate 4 can be maintained, and this can reduce the occurrence of the ball collision phenomenon between the pellets 1.

(Second Embodiment)
Next, a second embodiment of the composite protective plate according to the present invention will be described.

  FIG. 7: is the figure (7A) which looked at the setting state of the several pellet 10 which comprises the composite protection board concerning 2nd Embodiment from the plate | board surface direction which receives the impact of a scattered material, and the perspective view of the pellet 10 ( 7B).

  As shown in (7B), a composite protective plate provided with a plurality of pellets 10 in which convex portions 10a are arranged on the side surface of a cylinder may be employed. In this case, the pellets 10 are in line contact with each other between the convex portion 10a and the side surface of the pellet 10. When all the convex portions 10a come into contact with the side surfaces of the pellet 10, the portion of the impact applied to the pellet 10 that is transmitted in the lateral direction is distributed to 12 contact portions and spreads to the periphery. Therefore, the destruction area | region of the pellet 10 can be made smaller.

  In the second embodiment, the convex portion 10a is a semi-cylindrical body having a semicircular bottom surface, but is not limited to a semicircular shape, and is a columnar shape having both bottom surfaces whose angles are smaller or larger than the semicircular shape. You may employ | adopt a convex part. In that case, the number of contact portions between the pellets 10 may be less than 12 or may vary depending on the pellets 10. However, since the number of contact portions is in the range of 6 to 12, it is possible to obtain the effect of reducing the fracture area by dispersing the transmission of impact.

(Third embodiment)
Next, a third embodiment of the composite protection plate according to the present invention will be described.

  FIG. 8 is a view of the setting state of the plurality of pellets 20 constituting the composite protection plate according to the third embodiment, as viewed from the plate surface direction that receives the impact of the scattered matter.

  This composite protective plate has a configuration in which small pellets 21 are interposed between substantially cylindrical pellets 20. In addition, the filler 2 exists in parts other than the pellet 20 and the small pellet 21. In the case of the third embodiment, each pellet 20 is adjacent to another pellet 20 through 12 contact lines (or contact points) between the small pellets 21. For this reason, it is possible to obtain an effect of reducing the fracture area by distributing the transmission of the impact. Note that the number of the small pellets 21 may be further reduced so that the small pellets 21 and the pellets 20 are in contact with each other instead of the small pellets 21.

  FIG. 9 is a diagram showing variations of the small pellets 21 interposed in the gaps between the pellets 20.

  Here, the pellet 20 will be described as an example in which both the upper and lower surfaces are convex pellets, but the same applies to a pellet in which only one surface is convex. The small pellet 21 may have a convex shape on both the upper and lower surfaces as shown in the lower left part of FIG. 9 or a flat surface on the upper and lower surfaces shown in the middle lower part. Further, although not shown, only one of the upper and lower surfaces may be convex, or at least one of the upper and lower surfaces may be concave. Moreover, you may employ | adopt the small pellet 21 comprised from the small sphere 21a as shown in the lower right of FIG. When the small balls 21 a are stacked in the thickness direction of the pellet 20, the contact between the pellet 20 and the small pellet 21 is a point contact. In addition, the number of contact portions is the total number obtained by multiplying the number of small pellets 21 in contact with the pellet 20 by the number of small spheres 21 a constituting the small pellet 21. Therefore, the impact applied to the pellet 20 can be further dispersed, and the effect of making the fracture area smaller can be obtained.

  Hereinafter, the manufacturing process of the composite protection board concerning each embodiment is demonstrated. Here, the manufacturing process will be described by taking the composite protective plate according to the first embodiment as an example, but the same applies to the composite protective plate according to other embodiments by changing the type and arrangement of the pellets. The manufacturing process can be applied.

  FIG. 10 is a flowchart showing a manufacturing process of the composite protection plate according to the first embodiment.

  First, the pellet 1 is manufactured (step S101). The pellet 1 can be manufactured by a known manufacturing method. That is, in the case of the ceramic pellet 1, the pellet 1 can be manufactured through the steps of mixing the raw material powder and the sintering aid, granulating the mixed powder, molding using the granule, and sintering the molded product. . The molding method includes press molding in which powder is filled into a mold and pressed, extrusion molding in which raw materials are extruded from a die, and injection in which a thermoplastic plastic is added and injected into the mold while being heated. There is molding. The sintering method includes atmospheric pressure sintering and pressure sintering (hot press, HIP, etc.). Further, in the case of the metal pellet 1, a metal powder is molded (a molding method similar to the above ceramic can be applied) and then subjected to normal pressure or pressure sintering, and molten metal is injected into a mold. There are methods such as molding and cooling.

  Subsequent to step S101, a flat plate or a mold is prepared (step S102). Next, a frame is arranged around the flat plate or the mold (step S103). This frame has a height equal to or greater than the thickness of the composite protective plate. The gap between the frame and the flat plate or mold is preferably as small as possible. The material of the frame is not particularly limited. Any material that does not interfere with the subsequent processes may be used. For example, when the thermosetting resin is used as the filler 2, it is necessary to heat at the time of solidification. Therefore, the frame material is preferably a material that can withstand the heating.

  Subsequent to step S103, the pellet 1 is placed at a predetermined position on the flat plate or the mold (step S104). In the case of the composite protective plate according to the first embodiment, the pellets 1 are arranged so that the pellets 1 are in contact with each other at six locations. The arrangement method similar to 1st Embodiment can be employ | adopted only in the point to which the pellet 10 in 2nd Embodiment touches at a maximum of 12 places. In the case of the third embodiment, the pellet 20 and the small pellet 21 are arranged as shown in FIG. 8, for example. Further, when the pellets 1 are arranged, simply by placing the pellets 1 on a flat plate or a mold, an adhesive (double-sided tape or the like) or an adhesive (adhesive) is attached to at least one of the pellets 1 or the flat plate or the mold. The pellet 1 and the flat plate or the molding die may be fixed by attaching an agent or the like.

  Following step S104, the filler 2 is supplied into the frame (step S105). When a thermoplastic resin is employed as the filler 2, it is preferable to use a method in which a heated molten resin is poured into the frame. In addition, when a thermosetting resin is used as the filler 2, it is preferable to supply a liquid resin before curing into the frame (in the case of an epoxy resin adopting a two-liquid mixing method, two liquids are mixed). Is good to supply). Moreover, when using wood as the filler 2, it is preferable to put sawdust or the like with an adhesive in the frame.

  Subsequent to step S105, the filler 2 is solidified (step S106). Examples of the solidification method include a method of waiting for the solidification of the filler 2 for a predetermined time, and a method of applying heat to solidify the filler 2.

  Next, the frame is removed (step S107). However, it can also be used with a frame attached. In that case, the step S107 may be omitted. Finally, what is obtained through the process of step S107 is attached to the plate 4 (or structure) with an adhesive or Velcro (step S108).

  As mentioned above, although each embodiment and manufacturing process of the composite protection board were demonstrated, this invention is not limited to the above-mentioned structure and manufacturing process, and various deformation | transformation implementation is permitted in the range which does not deviate from the objective of this invention.

  For example, as shown in FIG. 11, a composite protective plate having a structure in which the composite protective plates according to the first embodiment are stacked in two stages may be adopted. In this case, for example, the height of the frame in the manufacturing process shown in FIG. 10 is further increased, and the process of step S104, step S105, and step S106 is performed again on the solidified filler 2 following step S106. It can be manufactured by repeating. The number of steps for stacking the composite protection plates may be three or more. When the number of steps to be stacked is increased, the risk of flying objects penetrating the composite protective plate can be reduced, while the weight of the composite protective plate is increased. Therefore, it is preferable to determine the number of stages according to the application.

  Moreover, the manufacturing process of the composite protection board concerning each above-mentioned embodiment is not limited to the manufacturing process shown in FIG. For example, the pellets 1 may be laid sideways in a container with the top opened so as to contact each other at six locations, and the filler 2 may be supplied from above the container and solidified.

  The present invention relates to battle vehicles (tanks, armored vehicles, artillery vehicles, etc.), ships (ships, ships, guard boats, cargo ships, etc.), aircraft (fixed wing aircraft, rotary wing aircraft, etc.), security vehicles, cash transport vehicles (resistant Peripheral equipment (control equipment, piping, etc.) by debris of high-speed rotating parts from special vehicles such as bullet armor plates), additional armor material (A) in general passenger cars, high-speed rotating bodies (turbine rotating parts such as generators and jet engines) ) Damage prevention plate (B), bulletproof vest additional bulletproof plate, explosives storage lining (C), peripheral equipment (control equipment, piping, etc.) due to damage to high pressure containers such as boilers and reaction kettles ) May be implemented in industries that manufacture and use protective plates (D) and the like that prevent damage.

It is the figure which looked at the setting state of the several pellet which comprises the composite protection board concerning the 1st Embodiment of this invention from the plate | board surface direction which receives the collision of a scattered material. It is a figure which shows the form which looked at the typical pellet used for the composite protection board shown in FIG. 1 from the cross-sectional direction of the composite protection board. FIG. 3 illustrates the force transmitted to the periphery when a projectile such as a bullet hits the convex surface of the pellet in the composite protective plate shown in FIG. 1, and (3A) shows the convex surface side of the pellet, that is, the surface of the composite protective plate. (3B) shows the situation seen from the side of the pellet, that is, the cross-sectional direction of the composite protective plate. It is a figure which shows the transmission condition of a part of impact when an impact is added to the protection board comprised from a different pellet from the pellet which comprises the composite protection board of this invention. It is a figure which shows the composite guard plate provided with the pellet whose one bottom is convex and the other is a plane, (5A) is a partially transparent view seen from the cross-sectional direction of the composite guard plate, (5B) Is an enlarged view of a part of one pellet, and (5C) is a view showing a change of the composite protective plate when an impact is applied to a part thereof. It is a figure which shows the composite protective board provided with the pellet with both bottoms convex, (6A) is a partially transparent view seen from the cross-sectional direction of the composite protective board, and (6B) is an enlarged portion of one pellet. (6C) is a diagram showing a change in the composite protective plate when an impact is applied to a part thereof. FIG. 7A shows a setting state of a plurality of pellets constituting the composite protection plate according to the second embodiment of the present invention, as viewed from the direction of the plate surface that receives the collision of the scattered matter, and a perspective view of the pellets (7B). is there. It is the figure which looked at the setting state of the several pellet which comprises the composite protection board concerning the 3rd Embodiment of this invention from the plate | board surface direction which receives the collision of a scattered material. It is a figure which shows the variation of the small pellet interposed in the clearance gap between the pellets shown in FIG. It is a flowchart which shows the manufacturing process of the composite protection board concerning each embodiment of this invention. It is a figure which shows the composite protection board which has the structure which piled up the composite protection board concerning the 1st Embodiment of this invention in two steps.

Explanation of symbols

1 Pellet 2 Filler 4 Plate 10 Pellet 10a Convex 20 Pellet 21 Small Pellet

Claims (6)

A plurality of pellets of spherical or cylindrical shape, arranged on a plate in a state in contact with six or more points or lines with each other, the gap between each pellet, filled with low packing material hardness than the pellets Characterized in that a convex portion is provided on the surface of the pellet, and the pellets are disposed so as to contact each other at a portion other than the convex portions or the convex portion and the convex portion. Composite protective plate. A plurality of pellets of spherical or cylindrical shape, arranged on the plate in a state in contact with six or more points or lines through the smaller small pellets from each pellet, gaps between the respective pellets and the small pellet Are filled with a filler having a hardness lower than that of the pellets and the small pellets, provided with convex portions on the surface of the pellets, and the pellets are either the convex portions or the convex portions and the convex portions. A composite protective plate, which is arranged so as to come into contact with other parts. The pellet is a circular pillar shape, the two bottom surface of the pellets, at least one of the bottom surface, the composite protection according to claim 1 or 2, characterized in that outwardly is convex Board. The pellet is a ceramic sintered body, the plate is a metal plate, the surface of the pellet in contact with the plate is a flat surface, and the surface opposite to the flat surface is a convex surface. The composite protective plate according to claim 3 . The pellet is a ceramic sintered body, the plate is a resin plate, the surface of the pellet in contact with the plate is convex, and the surface opposite to the convex surface is also a convex surface. The composite protective plate according to claim 3 . The composite pellet according to any one of claims 1 to 5 , wherein the pellets are arranged in a plurality of stages in the height direction from the plate.

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