KR100537440B1 - Sandwich panel with stiffener and foaming metal for door leaf and floor of rolling stock and its manufacturing method - Google Patents

Abstract

The present invention relates to a sandwich panel applied to the door, emergency door and the bottom plate of the passenger compartment / cab for a railway vehicle, comprising a core material made of a foamed metal and a skin material bonded to both sides of the core material, and prepares a predetermined mold And releasing the first skin material, the first adhesive sheet, the core material, the reinforcing material, the second adhesive sheet and the second skin material on the mold-treated mold, and sequentially laminating the panel. It characterized in that it is manufactured, including the step of forming, to improve the weak water resistance, flame resistance characteristics of the conventional water-resistant plywood, and to solve the light weight portion that was a problem in the stainless panel, the weak absorption / honeycomb sandwich structure has it is possible to improve the sound insulation performance, and also, all the parts that make up the panel so that the assembly through a single molding process simplifies the work process There is an effect that can be mad.

Description

Sandwich panel with stiffener and foaming metal for door leaf and floor of rolling stock and its manufacturing method}

The present invention relates to a sandwich panel, and more particularly, to a sandwich panel and a method for manufacturing the same, which is made of a lightweight metal material having excellent sound absorption performance and a reinforcing material for finishing and securing strength.

The door used in the existing railroad car was manufactured by assembling a number of stainless frames between the stainless plates and welding them together. Such a panel has a problem in that the manufacturing process is complicated and the weight is high.

Therefore, as a way to withstand light weight and bending load, recently, sandwich panels based on aluminum honeycomb have been used. However, in the case of a panel having a honeycomb core material, there is a problem in that the sound absorption / sound insulation performance is a weak part.

On the other hand, in the case of the water-resistant plywood used as the bottom plate has a problem that it is easily corroded due to vulnerable water resistance and flame resistance, and has a weakness to strength degradation, odor generation and fire.

The present invention is to solve the problems of the prior art as described above, while maintaining a sufficient strength, while improving the water resistance, flame resistance and sound absorption / sound insulation characteristics and at the same time to develop a sandwich panel and provide a manufacturing method thereof Has its purpose.

The above object of the present invention, the core material made of a foamed metal prepared by adding a blowing agent to the molten aluminum or stainless steel; It is achieved by a sandwich panel comprising first and second skin materials attached to both sides of the core material.

In this case, the first skin material and the second skin material may be made of different materials to block noise in different frequency domains.

As the first and second skin materials, a laminate sheet, an aluminum sheet, a stainless steel sheet, or the like may be selectively used.

On the other hand, both sides of the core may further include any one of the reinforcing material selected from the steel or stainless steel frame or aluminum extrusion bar to improve the strength reinforcement and / or assembly.

In addition, in order to achieve the object of the present invention, the step of preparing a predetermined mold and performing a mold release process, the first skin material 21, the first adhesive sheet 31, sequentially on the mold-treated mold (F), Method of manufacturing a sandwich panel comprising the step of laminating the core material 10, the reinforcing material 40, the second adhesive sheet 32 and the second skin material 22, and forming the panel after the lamination step is completed Is provided.

In this case, the molding step is selected from a hot press molding method for molding while applying heat and pressure, a method for curing at room temperature while maintaining a vacuum state, or a method for press molding at room temperature.

The above and other objects, specific advantages, and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of the reinforcement for structural strength reinforcement to the sandwich panel made of a foam metal core, Figure 2 is a cross-sectional view of the sandwich panel for the floor is applied to the assembly parts to simplify the work process of the connection portion An example is shown, and FIG. 3 is an exploded perspective view for explaining a manufacturing process of a sandwich panel having a foamed metal core.

As shown in FIG. 1, the sandwich panel according to the present invention includes a core material 10, first and second skin materials 21 and 22 bonded to upper and lower surfaces of the core material 10, and the core material 10. And the first and second adhesive sheets 31 and 32 for bonding the first and second skin materials 21 and 22 and the reinforcing material 40 for simplifying the work process of the strength reinforcement and / or the connecting portion. do.

As the core material 10, a foamed metal foamed by adding a foaming agent to the molten metal is applied to improve the sound insulation and / or sound absorption performance and to reduce the weight. Herein, aluminum or stainless steel may be used as the metal, and preferably, lightweight aluminum is preferable. By using the foamed metal as the core material, the sound insulation and / or sound absorption properties are excellent and the weight can be reduced by more than 20 times depending on the foaming rate.

The first and second skin materials 21 and 22 are attached to the upper and lower surfaces of the core material 10 to form the skin of the panel. The prepregs are laminated in a semi-cured state by impregnating resin into the reinforcing fibers. A laminate sheet, an aluminum sheet, a stainless sheet, or the like molded into a predetermined thickness can be used.

Here, the reinforcing fibers used in the laminate sheet can be both organic or inorganic fibers, preferably glass fibers, carbon fibers, aramid fibers or polyester fibers. The resin may be any thermosetting resin, but preferably phenolic, epoxy, polyester, polycarbonate, polypropylene, polyethylene, polyfluoroethylene, or the like.

Meanwhile, the first and second skin materials 21 and 22 attached to both surfaces of the core material 10 may be formed of different materials to improve sound insulation performance. That is, the first skin 21 attached to one surface may apply a laminate, and the second skin 22 attached to the other surface may apply a stainless sheet to block noise in different frequency regions.

As the first and second adhesive sheets 31 and 32, an adhesive film or an adhesive resin is used that is activated at a high temperature of 110 ° C. or higher and exhibits a curing reaction when it is maintained for a predetermined time in an activated state. For example, epoxy, urethane, polyester can be used.

The reinforcing material 40 may be a steel or stainless steel frame or aluminum extrusion bar, and the like, as well as the purpose of securing the strength of the core 10 made of foamed metal, as shown in FIG. Also used for finishing corners.

Hereinafter, a manufacturing process of the sandwich panel according to the present invention will be described with reference to FIG. 3.

First, the predetermined mold | type F is prepared and a mold release process is performed. The mold release treatment is a pretreatment process for easily and safely when demolding the molded product from the mold F, and is a task of coating and drying a mold release agent on the mold F as a whole. Mold (F) is suitable for the mold according to the manufacturing process of pressing by pressing at a high temperature state.

Next, the first skin material 21, the first adhesive sheet 31, the core material 10, the reinforcing material 40, the second adhesive sheet 32 and the second skin on the mold release (F) sequentially The ashes 22 are sequentially stacked.

 After the lamination step is completed, the panel is molded. The panel forming method is a hot press molding method for molding while applying heat and pressure depending on the type of adhesive used, or a method for curing at room temperature while maintaining a vacuum or press at room temperature. It is optionally applied among the methods of molding.

Therefore, all parts of the panel are assembled through a single molding process, thereby simplifying the work process.

The sandwich panel according to the present invention constructed and manufactured as described above may be used for cabin / cab doors, emergency doors and floor plates used in railway vehicles.

As described above, according to the present invention, it is possible to solve the light weight portion that has been a problem in the conventional stainless panel, and improve the weak sound absorption / sound insulation performance of the honeycomb sandwich structure.

In addition, since all the parts constituting the panel are assembled through a single molding process, the work process can be simplified.

Although the present invention has been described with reference to the above-mentioned preferred embodiments, it is possible to make various modifications or variations without departing from the spirit and scope of the invention. Accordingly, the appended claims will include any modifications or variations that fall within the spirit of the invention.

1 is a cross-sectional view of applying a reinforcing material for reinforcement of structural strength in a sandwich panel made of a foamed metal as a core,

Figure 2 is a cross-sectional view of the floor sandwich panel showing an example of applying the assembly to the reinforcement to simplify the work process of the connection portion,

3 is an exploded perspective view for explaining a manufacturing process of a sandwich panel using a foamed metal as a core.

<Explanation of Signs of Major Parts of Drawings>

10: heartwood

21, 22: first and second skin

31, 32: adhesive sheet

40: reinforcement

Claims (13)

In the sandwich panel comprising a core material and the first and second skin materials attached to both sides of the core material, The core material is foamed aluminum or foamed stainless steel prepared by adding a blowing agent to molten aluminum or stainless steel, Sandwich panel for manufacturing doors and floorboards of the railway vehicle applied to the reinforcement and the foam metal, characterized in that any one of the reinforcement selected from the steel or stainless steel frame or aluminum extrusion bar on both sides of the core material. The method of claim 1, The first skin material and the second skin material is a sandwich panel for the door and the bottom plate manufacturing of a railway vehicle to which the reinforcement and the foamed metal is applied, characterized in that made of different materials. The method of claim 1, The first and the second skin material is a laminate sheet, characterized in that the reinforcing material and the foamed metal applied to the railroad vehicle door and bottom plate manufacturing sandwich panel. The method of claim 1, The first and the second skin material is an aluminum sheet, characterized in that the reinforcing material and the sandwich panel for the door and the bottom plate manufacturing of the railway vehicle to which the foamed metal is applied. The method of claim 1, The first and the second skin material is a stainless steel sheet, characterized in that the reinforcing material and the sandwich panel for manufacturing the door and the bottom plate of the railroad car to which the foamed metal is applied. The method of claim 3, wherein The fiber constituting the laminate is an organic or inorganic fiber, the resin is a thermosetting resin, characterized in that the sandwich panel for the door and the bottom plate manufacturing of the railway vehicle to which the reinforcement and foamed metal is applied. The method of claim 6, The organic fiber of the fiber constituting the laminate is any one selected from glass fiber, carbon fiber, aramid fiber or polyester fiber, characterized in that the reinforcement and the sandwich panel for manufacturing doors and bottom plates of the rolling stock applied to the foamed metal. The method of claim 6, The thermosetting resin is any one selected from phenolic, epoxy, polycarbonate, polypropylene, polyethylene or polyfluoroethylene resin panels, sandwich panels for doors and bottom plate manufacturing of a railway vehicle using a reinforcing material and a foamed metal. delete In the manufacturing method of the sandwich panel comprising a core material and a skin material attached to both sides of the core material, Preparing a mold and performing a mold release process; Reinforcement of any one selected from the first skin material, the first adhesive sheet, the core made of foamed aluminum or foamed stainless steel, the frame made of steel or stainless steel or aluminum extrusion bar on both sides of the core, on the mold release-treated, Laminating a second adhesive sheet and a second skin material; And Method of manufacturing a sandwich panel for the door and the bottom plate manufacturing of the railway vehicle to which the reinforcement and the foamed metal is applied, including the step of forming the panel after the lamination step is completed. The method of claim 10, The forming step is a method of manufacturing a sandwich panel for doors and bottom plates of a railway vehicle using a reinforcing material and a foamed metal, characterized in that the hot press molding method for molding while applying heat and pressure. The method of claim 10, The molding step is a method of manufacturing a sandwich panel for doors and bottom plate manufacturing of a railway vehicle to which a reinforcement and a foamed metal is applied, which is a method of curing at room temperature while maintaining a vacuum state. The method of claim 10, The forming step is a method of manufacturing a sandwich panel for the door and the bottom plate manufacturing of a railway vehicle to which a reinforcement and a foamed metal is applied, characterized in that the press molding at room temperature.