CN112066797A - Frangible cover and forming method thereof - Google Patents
Frangible cover and forming method thereof Download PDFInfo
- Publication number
- CN112066797A CN112066797A CN202010898002.2A CN202010898002A CN112066797A CN 112066797 A CN112066797 A CN 112066797A CN 202010898002 A CN202010898002 A CN 202010898002A CN 112066797 A CN112066797 A CN 112066797A
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- China
- Prior art keywords
- cover
- foaming
- frame
- lid
- bottom frame
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41F—APPARATUS FOR LAUNCHING PROJECTILES OR MISSILES FROM BARRELS, e.g. CANNONS; LAUNCHERS FOR ROCKETS OR TORPEDOES; HARPOON GUNS
- F41F1/00—Launching apparatus for projecting projectiles or missiles from barrels, e.g. cannons; Harpoon guns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
- B26D3/06—Grooving involving removal of material from the surface of the work
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
- B26D3/14—Forming notches in marginal portion of work by cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/58—Moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
- B29C65/52—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive
- B29C65/54—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive between pre-assembled parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
- B29C65/561—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits using screw-threads being integral at least to one of the parts to be joined
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
- B29C65/64—Joining a non-plastics element to a plastics element, e.g. by force
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/45—Joining of substantially the whole surface of the articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
- B29C66/721—Fibre-reinforced materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
- B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/74—Joining plastics material to non-plastics material
- B29C66/742—Joining plastics material to non-plastics material to metals or their alloys
- B29C66/7422—Aluminium or alloys of aluminium
Abstract
The invention discloses a fragile cover, which comprises a bottom frame, a foaming cover and a pressing frame; the edge of the foaming cover is tightly pressed by the bottom frame and the pressing frame and is fastened by adopting a connecting piece penetrating through the bottom frame and the pressing frame; the edge area of the foaming cover is smaller than that of the bottom frame, so that a peripheral gap is formed between the edge of the foaming cover and the bottom frame and is used for filling airtight glue; the milling part of the foaming cover is also coated with airtight glue to prevent gas from leaking along the cover body of the foaming cover; the top surface diagonal of foaming lid is equipped with the cross stress groove along its radian, just the top surface of foaming lid is equipped with annular stress groove along mouthful frame all around, when the lid atress for the lid is four lamellas broken along the stress groove. The invention also discloses a forming method of the fragile cover. The frangible cover adopts the nonmetal foaming cover body, is combined with the metal bottom frame, cancels the metal cover through sealing treatment, and simultaneously meets two functions of transportation, air tightness storage and launching and breaking.
Description
Technical Field
The invention belongs to the technical field of missile storage and launching systems, and particularly relates to a fragile cover and a forming method thereof.
Background
The frangible cover is an important component in a missile storage and launching system, plays a role in sealing and protecting during transportation and storage, is quickly opened during launching, puts higher requirements on shortening the launching preparation time of weaponry, and requires the characteristics of simple structure, light weight, high strength, designability, high corrosion resistance and the like.
Stress grooves and weakening grooves are formed in the fragile cover, and when the guided missile is launched, the guided missile is broken through air flow generated by a missile launching front-guide engine or the head of the guided missile through impact, so that the guided missile is launched rapidly without preparation, and the rapid combat capability is improved.
In the existing engineering practice, the traditional technical scheme of 'metal cover for airtight storage, breakable cover for emission' in the original box type emission technology is difficult to meet the requirements, among the above-mentioned existing technical scheme, the airtightness of the emission box cover is sealed by adopting an aluminum cover, and the emission box cover is only used as a storehouse projectile body for storage at ordinary times, and can not be used in battle, and the polyurethane foam breakable cover without airtightness needs to be replaced in the preparation stage before war, so that the preparation time before war is increased, and the requirement of actual conditions can not be met, therefore, the design of the breakable cover which simultaneously meets two functions of transportation, airtightness storage and ejection breaking needs to be urgently needed.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides the fragile cover, which simultaneously meets two functions of transportation, air tightness storage and launching and breaking, achieves quick response, and meets the requirements of simple flow, and integrated function and structure.
To achieve the above object, according to one aspect of the present invention, there is provided a frangible cover comprising a bottom frame, a foaming cover, and a pressing frame;
the edge of the foaming cover is tightly pressed by the bottom frame and the pressing frame and is fastened by adopting a bolt penetrating through the bottom frame and the pressing frame; the edge area of the foaming cover is smaller than that of the bottom frame, so that a peripheral gap is formed between the edge of the foaming cover and the bottom frame and is used for filling airtight glue; the milling part of the foaming cover is also coated with airtight glue to prevent gas from leaking along the cover body of the foaming cover;
the top surface diagonal of foaming lid is equipped with the cross stress groove along its radian, just the top surface of foaming lid is equipped with annular stress groove along mouthful frame all around, when the lid atress for the lid is four lamellas broken along the stress groove.
Furthermore, high silica glass fiber cloth is pasted on the outer surface of the foaming cover, the high silica glass fiber cloth is divided into four pieces along the diagonal line of the outer surface of the foaming cover, and each piece of cloth covers the area of the foaming cover which is not more than 1/4.
Furthermore, the underframe comprises a supporting end and a connecting end, and the edge of the foaming cover is clamped in an included angle formed between the supporting end and the connecting end.
Furthermore, the end face of the connecting end is flush with the end face of the foaming cover, and the pressing frame presses the end faces of the foaming cover and the connecting end.
Further, a bolt is arranged between the pressing frame and the connecting end, so that the bottom frame, the foaming cover and the pressing frame are tightly connected.
Further, the crossed stress slot is an isosceles triangle opening, and the angle of the opening is preferably an acute angle.
Furthermore, the foaming cover body is formed in one step after being foamed by rigid polyurethane foam plastics.
In order to achieve the above object, according to another aspect of the present invention, there is provided a method of forming a frangible cap for preparing the frangible cap, comprising the steps of:
s1, foaming the rigid polyurethane foam plastic by adopting a foaming mould to form a blank of the foaming cover;
s2 machining the shape of the foaming cover, the crossed stress groove and the annular stress groove;
s3, cutting the high silica glass fiber cloth according to the lofting of the foaming cover body, and sticking the high silica glass fiber cloth on the outer surface of the foaming cover body by adopting a sealant;
s3 sanding the milled part of the foaming cover body and brushing airtight glue;
s4, coating airtight glue on the edge pasted by the high silica glass fiber cloth for edge sealing treatment;
s5, after solidification, bonding a bottom frame on the bottom edge of the foaming cover, and gluing and encapsulating a peripheral gap formed by the edge of the foaming cover and the bottom frame;
and S6, bonding the pressing frame after curing, fastening the pressing frame by using screws, and finally performing painting treatment.
Further, in step S1, the rigid polyurethane foam has a density of 0.30g/cm3～0.35g/cm3。
Further, in step S3, the high silica glass fiber cloth is cut into four pieces along the diagonal line of the outer surface of the foam cover body, each piece of cloth should cover an area of the foam cover not greater than 1/4, and the cloth sticking process of the foam cover body is completed in 4 times, and construction is performed according to the 1/4 area of the foam cover body each time.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
(1) the fragile cover comprises the bottom frame, the foaming cover and the pressing frame, the edge of the foaming cover is tightly pressed by the metal bottom frame and the pressing frame, the non-metal foaming cover body is combined with the metal bottom frame, the metal cover is cancelled through sealing treatment, two functions of air tightness in transportation and storage and impact breakage in launching are simultaneously met, quick response is achieved, and the requirements of simple process, function and structure integration are met.
(2) The cover body of the frangible cover is formed in one step after being foamed by hard polyurethane foam plastics, an aluminum bottom frame is arranged outside the cover body, the pressure frame is bonded and then fastened by screws, and the shape of the frangible cover is an outward convex arch structure. And the diagonal line of the inner wall of the cover body is provided with a crossed stress groove and a peripheral annular stress groove of the bead frame, and when the cover body is stressed, the stress is concentrated in the stress groove, so that the cover body is broken into four pieces along the stress groove. The comprehensive action of the stress groove ensures that the breakable cover is broken positively without damaging the warhead.
(3) In order to prevent the cover body from being crushed by granular substances sprayed after missiles in adjacent boxes leave the boxes, the outer surface of the cover body is adhered with a layer of high silica glass fiber cloth so as to improve the impact resistance and ablation resistance of the outer surface of the front cover.
(4) The forming process of the fragile cover comprises foaming of a foaming cover, groove milling on the foaming cover, cloth cutting of high silica glass fiber cloth, cloth pasting of the high silica glass fiber cloth, edge sealing, airtight glue coating, bottom frame adhering, filling and sealing, frame pressing on, painting and the like; adopting structural sealant to paste the high silica glass fiber cloth on the outer surface of the foaming cover body; in order to prevent the cloth removing phenomenon caused by the influence of high and low temperature of the environment, the edge of the cloth pasted on the foaming cover is coated with airtight glue for edge sealing treatment, and the periphery gap between the fragile cover and the metal bottom frame is subjected to filling and sealing treatment, so that the gas leakage between the metal frame and the foaming body is further prevented.
Drawings
FIG. 1 is a schematic view of an overall forming structure of a frangible cover according to an embodiment of the present invention;
FIG. 2 is a schematic side view of a frangible cover according to an embodiment of the present invention;
FIG. 3 is a partial enlarged view of the area A referred to in FIG. 2 according to an embodiment of the present invention;
FIG. 4 is a schematic view of a foam cap stress groove associated with a frangible cap in accordance with an embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view taken along line D-D of FIG. 4 in accordance with an embodiment of the present invention;
fig. 6 is a schematic view illustrating a potting process of the foam cover and the bottom frame according to an embodiment of the present invention.
In all the figures, the same reference numerals denote the same features, in particular: 1-bottom frame, 2-foaming cover, 3-pressing frame, 4-high silica glass fiber cloth, 5-cross stress groove, 6-annular stress groove and 7-periphery gap.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Fig. 1 is a schematic view of an overall forming structure of a frangible cover according to an embodiment of the present invention, and fig. 2 is a schematic view of a cross-sectional structure of the frangible cover along a side edge according to an embodiment of the present invention. As can be seen from fig. 1, 2 and the enlarged partial view of fig. 3, the frangible cover of the present invention, which has an outward convex arched shape, includes a bottom frame 1, a foam cover 2 and a pressing frame 3, wherein the foam cover 2 is formed by foaming rigid polyurethane foam and then is formed at one time, and the edge of the foam cover 2 is pressed by the metal bottom frame 1 and the pressing frame 3 and is fastened by a bolt penetrating through the bottom frame 1 and the pressing frame 3. The metal bottom frame 1 is preferably an aluminum bottom frame. The metal bottom frame 1 comprises a supporting end and a connecting end, and the edge of the foaming cover 2 is clamped in an included angle formed between the supporting end and the connecting end; the link is with pressing frame 3 direct contact, and the terminal surface of link is flat mutually with the terminal surface of foaming lid 2, presses frame 3 to press and covers the terminal surface of 2 and link in the foaming to be equipped with the bolt between pressing frame 3 and the link, so that underframe 1, foaming lid 2 and press zonulae occludens between the frame 3.
A layer of high silica glass fiber cloth 4 is adhered to the outer surface of the foaming cover 2 to prevent granular substances sprayed after guided missiles in adjacent boxes leave the box from crashing the cover body, so that the impact resistance and ablation resistance of the outer surface of the front cover are improved.
Fig. 4 is a schematic view of a foaming cover stress groove related to the frangible cover of the embodiment of the invention. As shown in the figure, the diagonal of the top surface of the foaming cover 2 is provided with a cross stress groove 5 along the radian thereof, and the cross stress groove 5 is symmetrically arranged in the middle of the top surface of the foaming cover 2. An annular stress groove 6 is arranged on the periphery of the edge frame on the top surface of the foaming cover 2; when the lid atress, the stress that receives concentrates in cross stress groove 5 and cyclic annular stress groove 6 for the lid is four lamella crushings along the stress groove, and the combined action of cross stress groove 5 and cyclic annular stress groove 6 can guarantee that breakable lid forward breaks, and does not lead to the fact the damage to the warhead.
FIG. 5 is a schematic cross-sectional view taken along line D-D in FIG. 4 according to an embodiment of the present invention. Referring to fig. 5, which is a partially enlarged view of the cross stress groove 5, the cross stress groove 5 is preferably an isosceles triangle opening, and the included angle in the groove is an acute angle, and preferably 30 °.
Fig. 6 is a schematic view illustrating a potting process of the foam cover and the bottom frame according to an embodiment of the present invention. As shown in fig. 4 and 6, the edge of the foam cover 2 is provided with a plurality of grooves (U-shaped grooves) for avoiding the bolts connecting the bottom frame 1 and the pressing plate 3, the foam cover 2 is integrally located on the bottom frame 1, and the edge area of the foam cover 2 is smaller than that of the bottom frame 1, so that a peripheral gap 7 formed between the edge of the foam cover 2 and the bottom frame 1 is used for filling airtight glue.
The invention relates to a fragile cover, wherein a foaming cover body is formed in one step after foaming rigid polyurethane foaming plastic, an aluminum bottom frame is arranged outside the cover body, and the cover body is fastened by screws after being bonded by a pressing frame, and the shape of the cover body is an outward convex arch structure. And the diagonal line of the inner wall of the cover body is provided with a crossed stress groove and a peripheral annular stress groove of the bead frame, and when the cover body is stressed, the stress is concentrated in the stress groove, so that the cover body is broken into four pieces along the stress groove. The comprehensive action of the stress groove ensures that the breakable cover is broken positively without damaging the warhead. In order to prevent the cover body from being crushed by the granular substances sprayed after the missiles in the adjacent boxes leave the boxes, a layer of high silica glass fiber cloth is adhered to the outer surface of the cover body so as to improve the impact resistance and ablation resistance of the outer surface of the front cover.
The forming and assembling steps of the frangible cover of the present invention comprise: foaming of the foaming cover, groove milling on the foaming cover, cloth cutting of the high silica glass fiber cloth, cloth pasting of the high silica glass fiber cloth, edge sealing, airtight glue coating, bottom frame adhering, encapsulation, frame pressing on, painting, and finally, performing airtight experiment on the formed fragile cover.
The method specifically comprises the following steps:
(1) foaming the hard polyurethane foam plastic by adopting a foaming mould to form a blank part of the foaming cover; the density of the rigid polyurethane foam used is preferably 0.30g/cm3～0.35g/cm3；
(2) Machining the shape and cross stress groove 5 and the annular stress groove 6, and dividing the outer surface of the cover body of the foaming cover 2 into four pieces along diagonal lines;
(3) cutting the high silica glass fiber cloth according to the lofting of the cover body, and cutting the high silica glass fiber cloth into four pieces along the diagonal line of the outer surface of the cover body of the foaming cover, wherein each piece of cloth can cover the area of the foaming cover which is not more than 1/4;
(4) the high silica glass fiber cloth is adhered to the outer surface of the cover body of the foaming cover 2 by adopting GM201 structural sealant, the cloth adhering process of the cover body is completed by 4 times, construction is carried out according to the 1/4 area of the cover body every time, the high silica glass fiber cloth is symmetrical and uniform during adhesion, and the high silica glass fiber cloth can prevent granular substances sprayed after missiles in adjacent boxes leave the boxes from crashing the cover body;
(5) sanding treatment is carried out on the milling part of the cover body of the foaming cover, QM-I airtight glue is prepared, and then the QM-I airtight glue is coated on the milling part to prevent gas from leaking along the cover body of the foaming cover 2; the milling part comprises the periphery of the cover body and a U-shaped groove;
(6) in order to prevent the cloth peeling phenomenon caused by the influence of high and low temperature of the environment, QM-I airtight glue is coated on the edge (one piece with three edges and 4 pieces in total) of the cloth of the foaming cover which exceeds the cloth edge by 3mm and is arranged in the cloth within 3mm for edge sealing treatment;
(7) after curing for 24 hours, bonding the foaming cover with the metal bottom frame by using south large 703 glue, and performing secondary encapsulation treatment on a peripheral gap 7 of 2mm around the breakable cover and the metal bottom frame by using a needle tube to prevent gas from leaking between the metal frame and the foaming body;
(8) after curing, the pressing frame is bonded and fastened by screws, and finally painting is carried out.
The formed sealing cover is subjected to a bursting test, a transportation vibration simulation test, a high and low temperature test, a pressure test, an air tightness test and the like, and the results show that: the breakable cover of the invention is all qualified in a bursting test, a transportation vibration simulation test, a high and low temperature test, a pressure test and an airtight test. The fragile cover meets the air tightness requirement, the heavy gas in the cover body is 10kPa +/-0.5 kPa, and the pressure drop is not more than 0.7kPa +/-0.1 kPa after the pressure is maintained for 4 days; meanwhile, the requirement of pressure bearing capacity is met, the forward bursting capacity is not more than 0.04MPa, and the reverse pressure bearing capacity is not less than 0.08 MPa.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The fragile cover is characterized by comprising a bottom frame (1), a foaming cover (2) and a pressing frame (3);
the edge of the foaming cover (2) is tightly pressed by the bottom frame (1) and the pressing frame (3) and is fastened by adopting a connecting piece penetrating through the bottom frame (1) and the pressing frame (3); the edge area of the foaming cover (2) is smaller than that of the bottom frame (1), so that a peripheral gap (7) is formed between the edge of the foaming cover (2) and the bottom frame (1) and is used for pouring airtight glue; the milling part of the foaming cover (2) is also coated with airtight glue to prevent gas from leaking along the cover body of the foaming cover (2);
the top surface diagonal of foaming lid (2) is equipped with cross stress groove (5) along its radian, just the top surface of foaming lid (2) is equipped with annular stress groove (6) along mouthful frame all around for the lid is the four-petal breakage along the stress groove when the lid atress.
2. The frangible cover according to claim 1, wherein the outer surface of the foam cover (2) is pasted with high silica glass fiber cloth (4), the high silica glass fiber cloth (4) is divided into four pieces along the diagonal of the outer surface of the foam cover (2), and each piece of cloth covers the area of the foam cover (2) which is not more than 1/4.
3. Frangible cover according to claim 1 or 2, characterized in that the base frame (1) comprises a support end and a connecting end, the edge of the foam cover (2) being trapped in the angle formed between the support end and the connecting end.
4. The frangible cap according to claim 3, wherein the end face of the connecting end is flush with the end face of the foam cap (2), and the pressing frame (3) presses against the foam cap (2) and the end face of the connecting end.
5. The frangible cover according to claim 1 or 4, characterized in that bolts are provided between the press frame (3) and the connecting end to tightly connect the bottom frame (1), the foam cover (2) and the press frame (3).
6. Frangible cover according to claim 5, characterized in that the intersecting stress channels (5) are preferably isosceles triangle openings, the angle of the openings being acute.
7. The frangible cap according to claim 1 or 6, wherein the cap body of the foam cap (2) is formed in one step after being foamed by rigid polyurethane foam.
8. A method of forming a frangible lid for use in making a frangible lid as defined in any one of claims 1 to 7, comprising the steps of:
s1, foaming the rigid polyurethane foam plastic by adopting a foaming mould to form a blank of the foaming cover (2);
s2 machining the shape of the foaming cover, the crossed stress groove (5) and the annular stress groove (6);
s3 cutting the high silica glass fiber cloth according to the lofting of the foaming cover body, and sticking the high silica glass fiber cloth on the outer surface of the cover body of the foaming cover (2) by adopting a sealant;
s3 sanding the milled part of the foaming cover body and brushing airtight glue;
s4, coating airtight glue on the edge pasted by the high silica glass fiber cloth for edge sealing treatment;
s5, after curing, bonding a bottom frame (1) on the bottom edge of the foaming cover (2), and gluing and encapsulating a peripheral gap (7) formed by the edge of the foaming cover (2) and the bottom frame (1);
and S6, bonding the pressing frame after curing, fastening the pressing frame by using screws, and finally performing painting treatment.
9. The method of claim 8, wherein the rigid polyurethane foam has a density of 0.30g/cm in step S13～0.35g/cm3。
10. The method for forming a frangible lid as claimed in claim 8, wherein in step S3, the high silica glass fiber cloth is cut into four pieces along the diagonal line of the outer surface of the foam lid (4), each piece of cloth should cover an area of the foam lid (4) not more than 1/4, and the process of adhering the foam lid (4) is performed in 4 times, each time according to 1/4 area of the lid.
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Cited By (1)
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|---|---|---|---|---|
| CN112985173A (en) * | 2021-02-10 | 2021-06-18 | 上海材料研究所 | Light sealed front end cover using supporting mechanism to improve reverse bearing capacity |
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