A sheet metal reinforcement structure for the top of a fire truck crew compartment and a preparation method thereof

Abstract

The present invention relates to the technical field of sheet metal reinforcement structure of fire trucks, and specifically to a sheet metal reinforcement structure for the top of a crew compartment of a fire truck and a preparation method thereof, wherein the sheet metal reinforcement structure comprises a nail-shaped panel arranged at the top and a disc-shaped enclosure arranged at the bottom, wherein the disc-shaped enclosure is connected to both ends of the nail-shaped panel to enclose a box-shaped closed space, wherein the box-shaped closed space is filled with a foam filler, wherein the nail-shaped panel is a metal sheet, wherein a plurality of connecting nails are welded on the inner surface thereof, and connecting nail perforations are provided on the inner surface of the disc-shaped enclosure at positions corresponding to the connecting nails; the disc-shaped enclosure is formed by bending a metal sheet, and both ends of the disc-shaped enclosure have a bending portion bent toward the inside, and the bending angle of the bending portion is 135 to 150 degrees. The sheet metal reinforcement structure is simple, and the purpose of strengthening is achieved in terms of strength and rigidity at the same time, and the production process is greatly simplified, the cost is reduced, and the demand for mass production is met.

Description

Technical Field

[0001] The invention relates to the technical field of sheet metal reinforcement structures for fire trucks, and in particular to a sheet metal reinforcement structure for a top of a crew compartment of a fire truck and a preparation method thereof. Background Art

[0002] Sheet metal reinforcement technology is widely used in daily production, but due to the limitations of sheet metal's own structural characteristics, a single sheet metal structure often has insufficient strength and rigidity in actual use. The conventional treatment methods to solve the above problems are: on the one hand, simply increase the amount of sheet metal (such as increasing the thickness of sheet metal), but the strength and rigidity obtained by this method cannot meet the requirements of actual product use, and will directly lead to problems such as increased raw material costs, increased dead weight, complex structure, and difficult production and processing; on the other hand, directly increase the strength and rigidity through the plastic deformation of the sheet metal itself, but this requires the use of large hydraulic equipment for processing and forming, and sometimes even requires multiple stampings to meet the design requirements, which leads to problems such as increased processing equipment costs, difficult production and processing, and high scrap rates.

[0003] At present, the top of the crew compartment of a fire truck is mainly made of sheet metal parts, and the conventional strengthening technology is to bend the sheet metal parts into a "corrugated plate" 10 (such as Figure 1 As shown in the figure, the "corrugated plate" 10 bent parts are welded to the required size, and then the panel 20 and the interior material 30 are respectively bonded on both sides by adhesive 40, that is, the sheet metal is plastically deformed by physical methods to achieve the purpose of strengthening. However, the above-mentioned method and structural design of welding and gluing the "corrugated plate" 10 bent parts first have the following problems in actual production:

[0004] (1) Laser cutting equipment is required to ensure accurate positioning, which is convenient for tool alignment in the subsequent bending process to reduce the probability of errors in the bending process; (2) Each sheet metal is bent more than 100 times, and a passenger compartment of conventional width generally requires two sheets of sheet metal, so a total of more than 200 bends are required (the top of a passenger compartment with a more complex structure requires a larger number of corrugated sheets), and each bend must be checked by three people before the cut is made. If any of the bends are wrong, all the previous work will be wasted; therefore, the risk of scrapping sheet metal parts in the bending process is relatively high; (3) Due to the large number of bends, the labor intensity of workers is high. The risk of safety accidents is also great; (4) Since the finished product after bending and welding is connected to the panel by gluing, the workpiece is pressed and positioned after gluing, and it takes 24 hours to enter the next process for installation and use. During this period, no relative displacement operation is allowed between the bonded workpieces, otherwise it will affect the bonding performance. Therefore, in mass production, the pressing and positioning operation of the gluing process requires a large area of ​​production site; Therefore, the existing sheet metal reinforcement structure is complex, the amount of sheet metal material used is large, the product is heavy, and the processing process is complex, the production cycle is long, the cost is high, and the safety is insufficient, which can no longer meet the needs of mass production. Summary of the invention

[0005] The purpose of the present invention is to provide a sheet metal reinforcement structure for the top of a fire truck crew compartment and a preparation method thereof in view of the deficiencies in the prior art. The sheet metal reinforcement structure is simple, achieves the purpose of reinforcement in terms of strength and rigidity, and greatly simplifies the production process, reduces costs, and meets the needs of mass production.

[0006] Provided is a sheet metal reinforcement structure for the top of a crew compartment of a fire truck, comprising a nail-shaped panel arranged at the top and a disc-shaped enclosure arranged at the bottom, wherein the disc-shaped enclosure is connected to both ends of the nail-shaped panel to enclose a box-shaped closed space, wherein the box-shaped closed space is filled with a foam filler, wherein the nail-shaped panel is a metal sheet, wherein a plurality of connecting nails are welded on the inner surface thereof, and connecting nail through holes are provided on the inner surface of the disc-shaped enclosure at positions corresponding to the connecting nails;

[0007] The disc-shaped enclosure is formed by bending a metal sheet, and both ends of the disc-shaped enclosure have bending portions bent inward, and the bending angle of the bending portions is 135 to 150 degrees.

[0008] In the above technical solution, the disc-shaped enclosure is welded and fixed to both ends of the nail-shaped panel, and the thickness of the nail-shaped panel and the disc-shaped enclosure is set to 3 to 5 mm.

[0009] In the above technical solution, the connecting nails are perpendicular to the nail-shaped panel, and the number of the connecting nails is set to 8 to 12.

[0010] In the above technical solution, the diameter of the connecting nail is set to 6-10 mm.

[0011] In the above technical solution, the foam filler is formed by foaming a foaming agent injected into a box-shaped closed space, and the thickness of the foam filler is set to 20 to 30 mm.

[0012] In the above technical solution, the connecting pin includes a head and a rod portion connected to each other, the head is inserted into the through hole of the connecting pin, and the head is welded to the through hole of the connecting pin.

[0013] In the above technical solution, a weld protrusion with a certain thickness is formed in the circumference of the hole between the connecting nail head and the connecting nail through-hole welding point.

[0014] The present invention also provides a method for preparing the sheet metal reinforcement structure on the top of the crew compartment of the fire truck, comprising the following steps:

[0015] Step a, cutting and cutting the metal sheet according to size to obtain a first metal sheet and a second metal sheet for standby use;

[0016] Step b, welding a plurality of connecting nails on the inner surface of the first metal sheet to obtain a nail-shaped panel;

[0017] Step c, bending the two ends of the second metal sheet for multiple times to form a bent portion with a certain bending angle, and punching connecting nail holes corresponding to the connecting nails on the inner surface of the second metal sheet to obtain a disc-shaped enclosure;

[0018] Step d, splicing the nail-shaped panel and the disc-shaped enclosure, so that the heads of the connecting nails are correspondingly arranged in the through-holes of the connecting nails, and the outer ends of the bent portion are respectively welded to the two ends of the nail-shaped panel, and then welding is performed on the outer surface of the disc-shaped enclosure along the circumferential direction of the gap between the heads of the connecting nails and the through-holes of the connecting nails to form a weld protrusion of a certain thickness, and a semi-finished product with a box-shaped closed space is obtained after welding;

[0019] Step e: apply the required amount of adhesive on the inner surfaces of the nail-shaped panel and the disc-shaped enclosure after welding, and after standing for a period of time, load the semi-finished product into the lower mold of the foaming tooling, and after accurate positioning, cover the upper mold box and lock it, and the box-shaped closed space becomes a foaming cavity; then inject the required amount of foaming agent into the foaming tooling, stir and mix before injection so that the foaming agent is injected into the foaming cavity at a uniform speed, and close the injection port after the foaming agent is injected. After foaming for a period of time, remove the mold and take out the part to obtain the finished product of the sheet metal reinforcement structure.

[0020] In the above technical solution, in step c, the number of bending times is 8 times.

[0021] In the above technical solution, in step e, the foaming time is 2 hours, and during the foaming process, moderate vibration or tapping is applied to the hollow or unevenly heated parts.

[0022] Beneficial effects of the present invention:

[0023] The present invention provides a sheet metal reinforcement structure for the top of a crew compartment of a fire truck, comprising a nail-shaped panel arranged on the top and a disc-shaped enclosure arranged on the bottom, wherein the disc-shaped enclosure is connected to both ends of the nail-shaped panel to enclose a box-shaped closed space, wherein the box-shaped closed space is filled with a foam filler, wherein the nail-shaped panel is a metal sheet, wherein a plurality of connecting nails are welded on the inner surface thereof, and connecting nail through holes are provided on the inner surface of the disc-shaped enclosure at positions corresponding to the connecting nails; the disc-shaped enclosure is formed by bending a metal sheet, and both ends of the disc-shaped enclosure have a bending portion bent toward the inside, and the bending angle of the bending portion is 135 to 150 degrees. With the above-mentioned reinforcement structure, the nail-shaped panel and the disc-shaped enclosure are both made of a metal sheet of a certain thickness, wherein the two ends of the disc-shaped enclosure are formed by bending and stamping, and are welded and fixed to the two ends of the nail-shaped panel, and the bending angle is controlled at 135-150°, which not only can match the design of the connection between the top of the fire truck crew compartment and each side, but also makes full use of the large bending angle to reduce the unexpected extension of the sheet metal material during actual use; on the other hand, the strength of the disc-shaped enclosure and the nail-shaped panel is further strengthened by the cooperation of the connecting nails and the connecting nail perforations, and then the foaming tooling is used to inject a foaming agent into the box-shaped closed space between the nail-shaped panel and the disc-shaped enclosure for foaming molding, so as to form a uniform foaming filler with a certain density (the density can reach several times the density of the "free foaming" part) around the aforementioned connecting nails, so that the sheet metal material can achieve the purpose of strengthening in both strength and rigidity, and better meet the requirements of the top structure of the fire truck crew compartment. Compared with the prior art, the sheet metal reinforcement structure and preparation method of the present invention have the following advantages:

[0024] (1) The present invention adopts a combination of physical and chemical methods to achieve the purpose of strengthening the sheet metal material in terms of strength and rigidity. The sheet metal reinforcement structure is simpler, the finished product no longer requires welding and splicing, the integrity is stronger, and the overall dead weight is reduced by 21%, with obvious advantages in lightweight structure;

[0025] (2) The sheet metal reinforcement structure greatly reduces the amount of metal plates used, making the thickness of the metal plates thinner while still meeting the requirements for strength and rigidity enhancement. The minimum thickness can reach 3 mm or even less. When the fire truck adopts the "corrugated plate" reinforcement structure of the existing technology, when the plate thickness is less than 3 mm, the strength and rigidity will begin to be insufficient;

[0026] (3) The preparation process of the sheet metal reinforcement structure of the present invention is simpler. When cutting, only ordinary shears and corner cutting tools are needed. The entire disc-shaped enclosure only needs to be bent 8 times to complete the required bending operation. The foaming process only needs to be left to stand for 2 hours before entering the next process for installation and use. Therefore, compared with the prior art, which requires laser cutting, cutting, bending for more than 200 times, welding, gluing, and waiting for 24 hours, the present invention greatly simplifies the production process and shortens the production cycle. The cost of the cutting process is reduced by 93%, the cost of the bending process is reduced by 97%, the cost of welding between finished products is eliminated, the waiting time of the process is reduced by 91%, and the production site occupies less space, which better meets the needs of mass production.

[0027] (4) The interior of the sheet metal reinforcement structure of the present invention is a foam filler with a small average thermal conductivity, which not only blocks the energy exchange generated by thermal convection and thermal radiation, but also directly blocks most of the heat conduction. Its use in the crew compartment of a fire truck can produce a significant thermal insulation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0029] Figure 1 It is a schematic diagram of a corrugated plate reinforcement structure in the prior art.

[0030] Figure 2 This is a schematic diagram of a sheet metal reinforcement structure on the top of a fire truck crew compartment in this embodiment.

[0031] Figure 3 This is a schematic diagram of another angle of the sheet metal reinforcement structure on the top of the crew compartment of a fire truck according to this embodiment.

[0032] Figure 4 This is a schematic structural diagram of a nail-shaped panel of a sheet metal reinforcement structure on the top of a fire truck crew compartment in this embodiment.

[0033] Figure 5 This is a schematic structural diagram of a disc-shaped enclosure of a sheet metal reinforcement structure on the top of a fire truck crew compartment in this embodiment.

[0034] Figure 6 for Figure 2 Schematic diagram of the enlarged structure at point A in the middle.

[0035] Figure 7 for Figure 5 Schematic diagram of the enlarged structure at point B in the middle.

[0036] Reference numerals:

[0037] Nail-shaped panel 1, connecting nail 11;

[0038] The disc-shaped enclosure 2, the connecting nail through-hole 21, and the bending portion 22;

[0039] Foam filler 3, weld bulge 4;

[0040] Bending angle β;

[0041] Corrugated board 10 , bonding panel 20 , interior material 30 , adhesive 40 . DETAILED DESCRIPTION

[0042] The present invention is further described in conjunction with the following embodiments and drawings.

[0043] A sheet metal reinforcement structure for the top of a fire truck crew compartment in this embodiment, such as Figure 2 and Figure 3 As shown, it includes a nail-shaped panel 1 arranged at the top and a disc-shaped enclosure 2 arranged at the bottom. The disc-shaped enclosure 2 is connected to both ends of the nail-shaped panel 1 to enclose a box-shaped closed space, and the box-shaped closed space is filled with a foam filler 3. Figure 3 As shown, the nail-shaped panel 1 is a metal sheet, and a plurality of connecting nails 11 are welded on its inner surface; Figure 4 As shown, a connection nail through hole 21 is provided on the inner surface of the disc-shaped enclosure 2 at a position corresponding to the connection nail 11. The disc-shaped enclosure 2 is formed by bending a metal sheet, and both ends of the disc-shaped enclosure 2 have a bending portion 22 bent toward the inside, and the bending angle β of the bending portion 22 is 135-150° (see Figure 6 ). With the above-mentioned reinforcement structure, the nail-shaped panel 1 and the disc-shaped enclosure 2 are both made of a metal sheet of a certain thickness, wherein the two ends of the disc-shaped enclosure 2 are formed by bending and stamping, and are welded and fixed to the two ends of the nail-shaped panel 1, and the bending angle β is controlled at 135-150°, which can not only match the design of the connection between the top of the fire truck crew room and each side, but also make full use of the large bending angle to reduce the unexpected extension of the sheet metal material during actual use; on the other hand, the strength of the disc-shaped enclosure 2 and the nail-shaped panel 1 is further strengthened by the cooperation of the connecting nail 11 and the connecting nail perforation 21, and then the foaming tool is used to inject a foaming agent into the box-shaped closed space between the nail-shaped panel 1 and the disc-shaped enclosure 2 for foaming molding, so that a uniform foaming filler 3 with a certain density (the density can reach several times the density of the "free foaming" part) is formed around the aforementioned connecting nail 11, so that the sheet metal material can achieve the purpose of strengthening in both strength and rigidity, and better meet the requirements of the top structure of the fire truck crew room.

[0044] Specifically, the disc-shaped enclosure 2 is welded and fixed to both ends of the nail-shaped panel 1. The thickness of the nail-shaped panel 1 and the disc-shaped enclosure 2 is set to 3-5 mm.

[0045] Specifically, the connecting nail 11 is perpendicular to the nail-shaped panel 1, the number of the connecting nails 11 is set to 8 to 12, and the diameter of the connecting nail 11 is set to 6 to 10 mm. The welding of the connecting nail 11 must ensure accurate positioning and verticality to facilitate the subsequent assembly operation with the disc-shaped enclosure 2. The connecting nail 11 includes a head and a rod that are connected to each other. The head is inserted into the connecting nail through-hole 21, and the head is welded to the connecting nail through-hole 21. As a preferred embodiment, a weld protrusion 4 of a certain thickness is formed in the circumferential direction of the hole where the head of the connecting nail 11 is welded to the connecting nail through-hole 21 (see Figure 5 ). By using the connection nail 11 and the connection nail perforation 21, the strength of the disc-shaped enclosure 2 and the nail-shaped panel 1 is further strengthened, and then the foaming tool is used to inject a foaming agent into the box-shaped closed space between the nail-shaped panel 1 and the disc-shaped enclosure 2 for foaming molding, so that a uniform foaming filler 3 with a certain density (the density can reach several times the density of the "free foaming" part) is formed around the aforementioned connection nail 11, so that the sheet metal material can be strengthened in both strength and rigidity, and better meet the requirements of the top structure of the crew compartment of the fire truck.

[0046] Specifically, the foam filler 3 is formed by foaming a foaming agent injected into the box-shaped closed space, and the thickness of the foam filler 3 is set to 20-30 mm.

[0047] The optimal plate thickness of the nail-shaped panel 1 and the disc-shaped enclosure 2, the thickness of the foam filler 3, the number of connecting nails 11, the diameter and its arrangement rules and welding methods are all obtained by the inventor after a large number of experiments. These not only need to be suitable for the needs of the top of the fire truck crew compartment, but also must meet the strength and rigidity requirements of the national standard GB7956 for the top of the fire truck crew compartment, that is, when the top of the cab needs to be operated or repaired by people, it should be ensured that it can withstand a static load of 100kg in the range of 300mm×200mm. After 5 minutes, the above load is removed, and the top of the cab should not have "structural damage or visible permanent deformation". Finally, the purpose of strengthening the sheet metal material in terms of strength and rigidity is achieved at the same time, meeting the requirements of the top structure of the fire truck crew compartment.

[0048] The preparation method of the reinforced structure of the sheet metal part on the top of the crew compartment of the fire truck is as follows:

[0049] Step a, cutting and cutting the metal sheet according to size to obtain a first metal sheet and a second metal sheet for standby use;

[0050] Step b, welding a plurality of connecting nails 11 on the inner surface of the first metal sheet to obtain a nail-shaped panel 1;

[0051] Step c, bending the two ends of the second metal sheet for multiple times to form a bent portion 22 with a certain bending angle, and punching connecting nail through holes 21 corresponding to the connecting nails 11 on the inner surface of the second metal sheet to obtain a disc-shaped enclosure 2;

[0052] Step d, splicing the nail-shaped panel 1 and the disc-shaped enclosure 2, so that the head of the connecting nail 11 is correspondingly inserted into the connecting nail through-hole 21, and the outer ends of the bent portion 22 are respectively welded to the two ends of the nail-shaped panel 1, and then welding is performed on the outer surface of the disc-shaped enclosure 2 along the circumferential direction of the gap between the head of the connecting nail 11 and the connecting nail through-hole 21 to form a weld protrusion of a certain thickness, and a semi-finished product with a box-shaped closed space is obtained after welding;

[0053] Step e: apply the required amount of adhesive on the inner surfaces of the nail-shaped panel 1 and the disc-shaped enclosure 2 after welding, and after standing for a period of time, load the semi-finished product into the lower mold of the foaming tooling, and after accurate positioning, cover the upper mold box and lock it, and the box-shaped closed space becomes a foaming cavity; then inject the required amount of foaming agent into the foaming tooling, stir and mix before injection so that the foaming agent is injected into the foaming cavity at a uniform speed, and close the injection port after the foaming agent is injected. After foaming for a period of time, remove the mold and take out the part to obtain the finished product of the sheet metal reinforcement structure.

[0054] Specifically, in step c, the number of bending times is 8 times.

[0055] Specifically, in step e, the foaming time is 2 hours, and during the foaming process, moderate vibration or tapping is applied to the hollow or unevenly heated parts.

[0056] Test example: The sheet metal reinforcement structure of this embodiment is compared with the "corrugated plate" reinforcement structure and its process in the prior art. The results are shown in Table 1:

[0057] Table 1. Comparison of the various processes of the sheet metal reinforcement structure of this embodiment and the "corrugated plate reinforcement structure

[0058]

[0059]

[0060] It can be seen from Table 1 that the sheet metal reinforcement structure of this embodiment has obvious advantages over the existing "corrugated plate" reinforcement structure in all steps of its production process. The entire preparation process is simpler. Only ordinary shears and corner cutting tools are needed for cutting. The entire disc-shaped enclosure 2 only needs to be bent 8 times to complete the required bending operation. The foaming process only needs to be left to stand for 2 hours before entering the next process for installation and use. Therefore, compared with the prior art that requires laser cutting-bending-more than 200 times-welding-gluing and waiting for 24 hours, the present invention greatly simplifies the production process and shortens the production cycle. The cost of the cutting process is reduced by 93%, the cost of the bending process is reduced by 97%, the cost of welding between finished products is eliminated, the waiting time of the process is reduced by 91%, and the production site occupies a small space, which better meets the needs of mass production.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A sheet metal reinforcement structure for the top of a fire truck crew compartment, characterized in that: It comprises a nail-shaped panel arranged at the top and a disc-shaped enclosure arranged at the bottom, wherein the disc-shaped enclosure is connected to both ends of the nail-shaped panel to enclose a box-shaped closed space, wherein the box-shaped closed space is filled with a foam filler, wherein the nail-shaped panel is a metal sheet, and a plurality of connecting nails are welded on the inner surface thereof, and connecting nail through holes are provided on the inner surface of the disc-shaped enclosure at positions corresponding to the connecting nails; The disc-shaped enclosure is formed by bending a metal sheet, and both ends of the disc-shaped enclosure have a bending portion bent inward, and the bending angle of the bending portion is 135 to 150 degrees; The disc-shaped enclosure is welded and fixed to the two ends of the nail-shaped panel, and the thickness of the nail-shaped panel and the disc-shaped enclosure is set to 3-5 mm; The connecting nail comprises a head and a rod portion connected to each other, the head is inserted into the through hole of the connecting nail, and the head is welded to the through hole of the connecting nail.

2. A sheet metal reinforcement structure for the top of a fire truck crew compartment according to claim 1, characterized in that: The connecting nails are perpendicular to the nail-shaped panels, and the number of the connecting nails is set to 8 to 12.

3. A sheet metal reinforcement structure for the top of a fire truck crew compartment according to claim 2, characterized in that: The diameter of the connecting nail is set to 6-10 mm.

4. The sheet metal reinforcement structure for the top of a fire truck crew compartment according to claim 1, characterized in that: The foam filler is formed by foaming a foaming agent injected into a box-shaped closed space, and the thickness of the foam filler is set to 20-30 mm.

5. The sheet metal reinforcement structure for the top of a fire truck crew compartment according to claim 1, characterized in that: A weld protrusion of a certain thickness is formed in the circumference of the hole at the welding point between the connecting nail head and the connecting nail penetration hole.

6. A method for preparing a sheet metal reinforcement structure for a fire truck crew compartment roof, applied to the sheet metal reinforcement structure for a fire truck crew compartment roof according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step a, cutting and corner cutting the metal sheet according to the size to obtain a first metal sheet and a second metal sheet, spare; Step b, welding a plurality of connecting nails on the inner surface of the first metal sheet to obtain a nail-shaped panel; Step c, bending the two ends of the second metal sheet for multiple times to form a bent portion with a certain bending angle, and punching connecting nail holes corresponding to the connecting nails on the inner surface of the second metal sheet to obtain a disc-shaped enclosure; Step d, splicing the nail-shaped panel and the disc-shaped enclosure, so that the heads of the connecting nails are correspondingly arranged in the through-holes of the connecting nails, and the outer ends of the bent portion are respectively welded to the two ends of the nail-shaped panel, and then welding is performed on the outer surface of the disc-shaped enclosure along the circumferential direction of the gap between the heads of the connecting nails and the through-holes of the connecting nails to form a weld protrusion of a certain thickness, and a semi-finished product with a box-shaped closed space is obtained after welding; Step e: apply the required amount of adhesive on the inner surfaces of the nail-shaped panel and the disc-shaped enclosure after welding, and after standing for a period of time, load the semi-finished product into the lower mold of the foaming tooling, and after accurate positioning, cover the upper mold box and lock it, and the box-shaped closed space becomes a foaming cavity; then inject the required amount of foaming agent into the foaming tooling, stir and mix before injection so that the foaming agent is injected into the foaming cavity at a uniform speed, and close the injection port after the foaming agent is injected. After foaming for a period of time, remove the mold and take out the part to obtain the finished product of the sheet metal reinforcement structure.

7. The method for preparing a sheet metal reinforcement structure for a fire truck crew compartment roof according to claim 6, characterized in that: In step c, the number of bending times is 8 times.

8. The method for preparing a reinforced structure of a sheet metal part on the roof of a fire truck crew compartment according to claim 6, characterized in that: In step e, the foaming time is 2 hours, and during the foaming process, moderate vibration or tapping is applied to the hollow or unevenly heated parts.

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