JPH0688363B2 - Method for manufacturing hollow structure - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a hollow structure used for a vehicle body and an air conditioning duct of a cargo loading portion such as a refrigerating vehicle and a cold storage vehicle, and a skeleton of a container.

(Prior Art) Conventionally, for example, as a peripheral wall of a load-carrying portion such as a refrigerating car and a refrigerating car, a foam member such as urethane foam is used as a core.
It had a structure in which both front and back sides were sandwiched between aluminum panels.

In this case, a gap is apt to be formed between the walls, and a member or the like that constitutes a metal frame is required at that portion to connect the walls to each other. There is a problem in heat retention due to the heat transfer of the above, and it took time and effort to bring the walls into close contact with each other so that there is no gap therebetween.

Therefore, in order to solve such a problem, it is conceivable to form the hollow structure as a peripheral wall having a seamless integrated structure.

Examples of such a hollow structure include industrial materials 198.
7, VOL.35, NO.7 (May 20, 1987, published by Nikkan Kogyo Shimbun), page 191 is known.

This conventional hollow structure is formed by winding a resin-attached glass fiber around a mandrel and curing it, and then molding it by a filament winding method in which the mandrel is demolded, and its peripheral wall is glass fiber reinforced plastic (FRP). Are formed integrally.

However, in the conventional hollow structure described above,
High specific gravity due to high glass fiber ratio (50%).

Therefore, if the wall thickness of the peripheral wall is increased in order to ensure the required rigidity, there is a problem that the weight is increased accordingly.

Further, since the peripheral wall is made of FRP, it cannot be said that it has an excellent heat insulating effect, and there is a problem that it is not suitable for a heat insulating application.

Therefore, it is conceivable to use a honeycomb material in order to reduce the weight and improve the heat insulating property.

As a hollow structure using such a honeycomb material,
The one described in JP-A-61-54927 is known. This hollow structure is manufactured by winding and adhering a honeycomb structure on the outside of a small-diameter inner tubular body, and slidingly fitting and adhering a large-diameter outer tubular body on the outside thereof.

(Problems to be Solved by the Invention) However, in the manufacturing method as described above, the outer tubular body is limited to a shape that can be slidably fitted to the outside of the honeycomb structure, and the shape of the hollow structure is restricted. As a result, the degree of freedom in molding is low, and in particular, it cannot be applied to large-sized parts such as the freezer / refrigerator part of a refrigerated vehicle and a refrigerated vehicle.

The present invention was made in view of the above conventional problems, in manufacturing a hollow structure using a honeycomb material having a feature of being lightweight and highly rigid and having an excellent heat insulating effect. The object of the present invention is to provide a manufacturing method having a high degree of freedom in molding and a good finish.

(Means for Solving the Problem) In order to achieve the above-mentioned object, in the method for manufacturing a hollow structure of the present invention, an inner surface member is wound around a mandrel, and then an adhesive layer is formed between the inner surface member and the inner surface member. The honeycomb material is wound and adhered from above the inner side surface material with the interposition of, and then the outer side surface material is wound and adhered from above the honeycomb material with an adhesive layer interposed between the inner surface material and the surface of the honeycomb material. Then, finally, after curing the adhesive layer, the honeycomb material and the inner and outer surface materials in the laminated state are released from the mandrel.

(Operation) In the present invention, first, the inner side material is wrapped around the mandrel,
Next, the honeycomb material is wound and adhered on the inner surface material with the adhesive layer interposed. The adhesive layer may be formed in advance before winding the inner surface material, or may be formed on the outer surface of the inner surface material or the back surface of the honeycomb material after winding the inner surface material. Good.

Next, the outer surface material is wound and adhered on the honeycomb material with the adhesive layer interposed. Also in this case, the adhesive layer may be formed on the surface of the honeycomb material before winding the honeycomb material, or may be formed on the surface of the honeycomb material or the back surface of the outer surface material after winding the honeycomb material. Good. Then, finally, after the adhesive layer is cured, the honeycomb material and the inner and outer surface materials in the laminated state are released from the mandrel to form a hollow structure.

In this manner, the hollow structure is formed by the inner and outer surface materials having the honeycomb material as the core, but the honeycomb material and the inner and outer surface materials are first laminated to form a hollow body, and while being wound around the mandrel. In order to stack, even if there is a circumferential difference between the inside and outside of the honeycomb material, there is no deviation in the bonding surface between the honeycomb material and the double-sided material, and the stacking is performed while minimizing the internal and external deformation of the honeycomb material. You can

In addition, since the honeycomb material and the double-sided material are laminated while being wound in this manner, no joint is formed on the peripheral wall.

Further, the hollow structure of the present invention has an excellent heat insulating property because the air layer is formed of the honeycomb material.

(Examples) Hereinafter, examples of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a cross-sectional view showing a hollow structure A manufactured by a manufacturing method according to an embodiment of the present invention. The hollow structure A is used, for example, as a cold room of a cold vehicle and has a substantially rectangular hollow inside. The part 10 is formed.

In the figure, 1 indicates a peripheral wall, and FIG. 2 shows a partially enlarged view thereof.

The peripheral wall 1 is formed by using the honeycomb material 2 as a core and adhering the inner side surface material 5 and the outer side surface material 6 to the inner and outer surfaces thereof with the inner adhesive member 3 and the outer adhesive member 4 as adhesive layers. There is.

The honeycomb material 2 has a well-known structure in which a large number of cells each having a hexagonal cross section are continuously arranged vertically and horizontally, and is formed of a plate material such as an aluminum plate, a paper, a plate, and an aramid resin plate.

The inner and outer adhesive members 3 and 4 are those in which a base material having permeability is impregnated with a resin, and as the base material, for example,
Paper or non-woven fabric (polyester resin, vinylon resin, etc., with a basis weight of 30 to 60 g / m ² ) is used. As the resin, unsaturated polyester is used as a hard urethane foam system material in a 3: 1 ratio.
Mixtures of up to 6: 1 (weight ratio) are used. Both adhesive members 3 and 4 are for adhering the inner and outer double-sided materials 5 and 6 to the honeycomb material 2. Instead of both adhesive members 3 and 4, simply apply an adhesive material to this portion. You may make it form an adhesive layer.

The inner and outer double-sided materials 5 and 6 are formed of FRP plates formed by impregnating reinforcing fibers with a resin. For example, as the reinforcing fibers, a fiber material such as glass, carbon, aramid, or polyacrylate is used. As the material, a thermosetting resin such as unsaturated polyester or epoxy is used.

Next, a method for manufacturing the hollow structure A will be described step by step.

This manufacturing method includes a step of winding the inner surface material 5 (FIG. 3), a step of winding the inner adhesive member 3 (FIG. 4), a step of winding the honeycomb material 2 (FIGS. 6 to 9), The winding process of the outer adhesive member 4, the winding process of the outer side material 6, the hardening process, and the defastening process are performed in this order.

First, in the step of winding the inner side surface material 5, as shown in FIG. 3, the tape material 50, the sheet material 51, or the thread material 52 of the reinforced fiber is fed through the resin tank 53 and impregnated with the resin 54. Is wrapped around the mandrel M so as to form a face.

Next, in the step of winding the inner adhesive member 3, as shown in FIG.
The resin 32 is impregnated through the material 31 and is wound on the inner surface member 5. The step of winding the inner adhesive member 3 may be performed simultaneously with the step of winding the inner surface member 5, as shown in FIG.

In the subsequent step of winding the honeycomb material 2, the honeycomb material 2 is wound on the inner adhesive member 3, and there are three methods as shown in FIGS. 6 to 9, for example.

In the method shown in FIG. 6, the honeycomb material 2 formed in a tape shape is expanded and wound in a spiral shape.

In the method shown in FIG. 7, the wide honeycomb material 2 corresponding to the length of the mandrel M is spread and the whole is wound.

In the case of the method shown in FIGS. 6 and 7, as shown in FIG. 8, a sheet material such as paper or nonwoven fabric is provided on one side of the honeycomb material 2.
20 is pre-bonded and wound so that this sheet material 20 is on the inside. This is a deformation preventing means for restricting the cells of the honeycomb material 2 so as not to be opened due to winding.

In the method of FIG. 9, the unexpanded honeycomb block 2 shown in (a) is formed into a tubular shape by adhering the end faces in the expanding direction to each other as shown in (b), and then as shown in (c). Then, the inner surface member 5 and the inner adhesive member 3 are wound on the inner surface member 5 so as to cover the mandrel M from one end side thereof in advance, and in this wound state, it is in a stretched state. . In this case, since the unexpanded honeycomb block 2 expands by nearly 170% when expanded, the length of the honeycomb block 2 is determined by taking this expansion rate into account.

As shown in FIG. 10, the honeycomb material 2 can be subjected to various processing before expansion. In the figure, (a) part is an example in which the groove 21 is cut, and (b) part is radiused. twenty two
Is an example in which is cut, and (C) is an example in which another member 23 is insert-processed.

In the next step of winding the outer adhesive member 4, the outer adhesive member 4 is wound from above the honeycomb material 2 in the same manner as the step of winding the inner adhesive member 3.

Further, in the subsequent step of winding the outer surface material 6, the outer surface material 6 is wound from above the outer adhesive member 4 in the same manner as the step of winding the inner surface material 5.

Next, in the curing step, the resin used in each step described above is cured, which may be cured using a heating furnace or the like, or may be cured at room temperature.

The demolding step is the final step, and by demolding the mandrel M after the curing step, the hollow structure A having the hollow portion 10 formed therein is molded.

And, the hollow structure A molded as described above,
Since the peripheral wall 1 has a honeycomb material 2 as a core, and this is sandwiched between the inner and outer double-sided materials 5 and 6 by FRP,
It is lightweight and has high rigidity, and an excellent heat insulating effect is obtained by the air layer of the honeycomb material 2. Furthermore, the honeycomb material 2
Also, since the double-sided materials 5 and 6 are wound, no seam is formed in the middle of the peripheral wall 1, which also improves the heat insulating property.

In addition, since the adhesive members 3 and 4 in which the base material 30 is impregnated with the resin 32 are interposed between the double-sided materials 5 and 6 and the honeycomb material 2, the honeycomb material 2 is formed in the winding step of the honeycomb material 2. Material
When pressed against 30, the resin 32 oozes from the base material 30 to the peripheral portion of the end surface of the honeycomb material 30, as shown in FIG.
A stronger adhesive force can be obtained compared to the case where only the end faces are bonded.

Although the embodiment of the present invention has been described in detail above with reference to the drawings, the specific structure is not limited to this embodiment. For example, the hollow structure is used in a luggage compartment of an automobile such as a cold storage vehicle and a freezing vehicle. Not limited to this, it can be used for air-conditioning ducts for vehicles, bumper amateurs, other industrial equipment and buildings (containers, capsule houses), etc.

Further, the shape of the hollow portion is not limited to a square shape, but may be any shape such as a circle or a polygon. In this case, the shape of the mandrel corresponds to the shape of the hollow portion.

(Effects of the Invention) As described above, according to the present invention, a hollow structure using a honeycomb material for the core, which is lightweight and highly rigid, has excellent heat insulating performance and is excellent in processing applicability. In manufacturing, since the inner and outer surface materials and the honeycomb material are molding methods in which the mandrel is wound in order, even if there is a circumferential difference between the inside and the outside of the honeycomb material, a deviation occurs in the bonding surface between the honeycomb material and the double-sided material. In addition, the honeycomb material can be laminated while minimizing the deformation inside and outside, and the effect that a clean finish can be obtained is obtained.
Since the honeycomb material and the double-sided material are laminated while being wound in this manner, it is possible to provide an effect that a hollow structure having a seamless peripheral wall can be provided.

In addition, the shape of the hollow portion can be changed simply by changing the shape of the mandrel, and the effect that the degree of freedom in molding is high can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a hollow structure manufactured by a manufacturing method according to an embodiment of the present invention, FIG. 2 is a partially enlarged view showing a peripheral wall of the hollow structure, and FIGS. It is explanatory drawing which shows the manufacturing method of an example. A ... Hollow structure 1 ... Peripheral wall 2 ... Honeycomb material 3 ... Inner adhesive member (adhesive layer) 4 ... Outer adhesive member (adhesive layer) 5 ... Inner surface material 6 ... Outer surface material 10 ... Hollow part M ... Mandrel

Claims (1)

[Claims] 1. A mandrel is wound with an inner surface material, and an adhesive layer is interposed between the mandrel and the inner surface material so that a honeycomb material is wound from above the inner surface material so as to be adhered. The outer surface material is wound and adhered from above the honeycomb material by interposing an adhesive layer between the honeycomb material and the surface of the material, and finally, after curing of the adhesive layer, the honeycomb material and the inner and outer surface materials in a laminated state are removed from the mandrel. A method for producing a hollow structure, which comprises demolding.