JPH10128886A - Aluminum sound-suppressing panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aluminum sound suppressing panel adapted to a drafting board such as a plotter board and having a light weight and necessarily sufficient strength by suppressing collision sound in the case of bringing an object such as a lithographic pen into contact with its surface. SOLUTION: Metal front plate 2 and rear plate 3 are adhered to front and rear surfaces of a honeycomb core via adhesive layers. The adhesive layers are provided to cover substantially overall surfaces of the core at the front and rear plate sides. The adhesive layer 4 interposed between the plate 2 and the core is formed of silicone modified epoxy adhesive, and the adhesive layer 5 interposed between the plate 3 is formed of rubber modified epoxy adhesive.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an aluminum honeycomb soundproof panel suitable for use in a plotter board or the like.

[0002]

2. Description of the Related Art Conventionally, there has been known an aluminum honeycomb panel having a structure in which metal plates are attached to upper and lower surfaces of an aluminum honeycomb core. This type of aluminum honeycomb panel is widely used in various fields such as building panels, structural materials for aircraft, structural materials for vehicles, and the like because of its high strength and easy handling despite its light weight. Among the aluminum honeycomb panels, those which are relatively inexpensive and have general strength and durability are used for vehicles, building interior materials and the like, and those requiring high strength, high heat resistance and durability are aircraft. It is used for applications. By the way, in recent years, this kind of aluminum honeycomb panel is not limited to the above-mentioned conventional use, and is utilized as a curved panel such as a parabolic antenna reflector or a plotter board (drawing board) for an automatic drafting apparatus such as a CAD by utilizing its lightness. Has also been applied.

[0003] Since the aluminum honeycomb panel has a structure in which metal plates are bonded to both surfaces of a honeycomb core with an adhesive, the strength and durability of the panel tend to be governed by the strength and durability of the adhesive. It is in. Therefore, conventionally, for general strength and durability, a honeycomb core is formed by thickly applying a liquid adhesive mainly composed of an epoxy resin urethane prepolymer or a synthetic rubber to an adhesive portion and then bonding them at room temperature or by heating. It is manufactured by bonding a metal plate to a high strength, high durability, heat-curable sheet-like adhesive, so-called prepreg, is installed on the bonding part, and pressed. It is manufactured by setting the adhesive under high temperature and pressure for a long time to cure the adhesive.

[0004] The above-mentioned bonding technique is also applied to a case where an aluminum honeycomb panel is used in a new field, and the aluminum honeycomb panel is applied to a plotter board (drawing board) for an automatic drafting apparatus such as a CAD. In this case, an epoxy resin-based adhesive was used, but the epoxy resin adhesive alone is hard and rigid, but has a brittle defect, so a rubber-based epoxy with a small amount of synthetic rubber added to the epoxy adhesive Adhesive is used.

[0005]

By the way, in an automatic drafting apparatus provided with an aluminum honeycomb panel having the above structure as a plotter board, the tip of a drawing pen repeatedly contacts and separates from the drafting paper on the aluminum honeycomb panel top plate. While drawing on the drafting paper on the panel, the aluminum honeycomb panel is made of metal and has the property of easily sounding, and there are many hollow parts (cavities) inside the honeycomb core. When the drawing pen hits the front panel of the aluminum honeycomb panel, a contact sound (collision sound) frequently occurs. This collision sound is greater in a drafting board made of an aluminum honeycomb panel than in a wooden drawing board.Although the drafting board of an aluminum honeycomb panel is lightweight, has high strength, and has excellent flatness, It is desired to suppress this collision sound.

The present invention has been made in view of the above-mentioned problems, and can suppress a collision sound when an object such as a drawing pen contacts the surface, and is suitable for a drawing board such as a plotter board. It is an object of the present invention to provide an aluminum honeycomb panel which is lightweight and has necessary and sufficient strength.

[0007]

According to the present invention, in order to solve the above-mentioned problems, a metal front plate and a back plate are bonded to the front and back surfaces of a honeycomb core via bonding layers, and the bonding layer is bonded to the honeycomb core. And an adhesive layer interposed between the front plate and the honeycomb core is made of a silicon-modified epoxy adhesive, and is provided between the back plate and the honeycomb core. The adhesive layer interposed therebetween is made of a rubber-modified epoxy adhesive. In the present invention,
Each opening on the front side of the hollow part formed in the honeycomb core is closed by an adhesive layer made of silicone-modified epoxy adhesive, and each opening on the back side is closed by an adhesive layer made of rubber-modified epoxy resin. Is preferred.

When an object such as a drawing pen for drawing comes into contact with the front plate of the honeycomb core, a large number of hollow portions exist inside the honeycomb core. Since an adhesive layer of a silicon-modified epoxy adhesive having a higher viscosity than that of the rubber-modified epoxy adhesive is provided on the surface on the core side, contact noise is suppressed by the presence of this adhesive layer. In addition, since the adhesive layer of the silicon-modified epoxy adhesive closes the opening of each hollow portion of the honeycomb core, the resonance sound that resonates in the hollow portion is suppressed. Further, since the hollow portion on the other side of the honeycomb core is closed by an adhesive layer of a rubber-modified epoxy resin agent, sound leakage due to the opening does not occur. Therefore, the sound suppressing effect of the silicone-modified epoxy adhesive is not impaired. Furthermore, since the honeycomb core and the back plate can be firmly joined by the adhesive layer of the rubber-modified epoxy adhesive, the necessary strength and rigidity of the entire honeycomb panel are secured.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show an embodiment of an aluminum honeycomb panel according to the present invention. An aluminum honeycomb panel A of this embodiment has a honeycomb core 1 having a front plate 2 made of a metal plate adhered to the surface of a honeycomb core 1 and a honeycomb core 1 having a surface. A back plate 3 made of a metal plate is adhered to the back surface of. As shown in FIG.
As shown in FIG. 1, an adhesive layer 4 made of a silicon-modified epoxy adhesive is provided, and an adhesive layer 5 made of a rubber-modified epoxy adhesive is provided on the upper surface of the back plate 3.

As shown in FIG. 1, the honeycomb core 1 has a large number of hexagonal cells 6 arranged and integrated, and each cell 6 has a hollow portion 7 inside. And each cell 6
Is closed by an adhesive layer 4 made of a silicon-modified epoxy adhesive, and a lower opening of each cell 6 is closed by an adhesive layer 5 made of a rubber-modified epoxy adhesive. As shown in FIG. 2, the adhesive is attached to the front plate 2 and the back plate 3 with a substantially uniform thickness, and the thixotropy (th
ixotropy (thixotropic) so as to form fillet portions 4a, 5a along the opening of the cell. The front plate 2 and the back plate 3 are made of a metal plate such as a coated steel plate, an enameled steel plate, a stainless steel plate, a copper or copper alloy plate, an aluminum or aluminum alloy plate, and a titanium or titanium alloy plate.

[0011] The silicon-modified epoxy adhesive is 2
It is known as one type of liquid type non-solvent type room temperature curing type rubber-modified adhesive, and specifically, a resin liquid mainly composed of an epoxy resin as a main component and a silicone modified oligomer mainly. A resin liquid is blended and cured. The epoxy adhesive of this type is more flexible than the rubber-modified epoxy adhesive described later, and is provided on almost the entire lower surface of the front plate 2 to suppress vibration of the front plate 2 and to form the honeycomb core 1. When the opening of the hollow portion 7 is closed, resonance in the hollow portion 7 is efficiently suppressed. More specifically, a modified silicone polymer is used as a main agent in an amount of 90 to 97.
%, Tertiary amine 2-5% and a small amount of additives, epoxy resin 40-50%, inorganic filler 10-20%, reactive diluent 10-20% For example, a 1: 1 mixture of an adhesive [trade name: MOS1005 manufactured by Konini] and an adhesive may be used.
The rubber-modified epoxy adhesive is known as one type of a solvent-free, room-temperature-curable rubber-modified adhesive, and eliminates the lack of toughness of a normal epoxy resin adhesive such as peeling and impact. Specifically, a rubber-based organic polymer is mixed with an epoxy resin as a main component. More specifically, a mixture of Kanekasilyl (trade name, manufactured by Kaneka Chemical Industry Co., Ltd.) and a bisphenol A type epoxy resin, and a modified aliphatic polyamine as a curing agent containing 10: 2 to 10: 5 as an epoxy resin as a main agent. Those mixed in the range are used.

In the aluminum honeycomb panel A having the above-described structure, an adhesive layer 4 made of a silicone-modified epoxy adhesive having a higher viscosity than that of a rubber-modified epoxy adhesive is provided on almost the entire back surface of the front plate 2. In addition, since the adhesive layer 4 covers the opening of the hollow portion 7 of the honeycomb core 1, the vibration of the front plate 2 itself can be suppressed, and the sound wave that tends to resonate in the hollow portion 7 is also suppressed. Specifically, a contact sound (collision sound) when an object such as a drawing pen for drawing comes into contact with the front plate 2 can be suppressed. Further, an adhesive layer 5 of a hard rubber-modified epoxy resin agent is provided on the upper surface side of the back plate 3, and the honeycomb core 1 and the back plate 3 are firmly joined to each other. Is also secured. Further, since the lower opening of the hollow portion 7 of the honeycomb core 1 is closed by the adhesive layer 5 made of a rubber-modified epoxy adhesive, even if some resonance sound occurs in the hollow portion 7, no sound leakage occurs. Therefore, the sound suppressing effect produced by the adhesive layer 4 of the silicon-modified epoxy adhesive is not impaired.
Further, since the adhesive layer 4 covers substantially the entire surface of the front plate 1 with a substantially uniform thickness, it is effective in suppressing the collision sound to the front plate 1 without unevenness, and furthermore, the cell 6 of the honeycomb core 1 is effective.
Since the thick portions 4a and 5a are formed on the adhesive layers 4 and 5 respectively around the opening peripheral portion 6a, no sound leakage occurs between adjacent cells and resonance does not occur. For this reason, a sound suppressing effect is exhibited extremely efficiently.

FIGS. 3 to 8 illustrate a method of manufacturing the aluminum honeycomb panel A having the above-described structure, and FIGS. 3 to 8 cover almost the entire back surface of the front plate 2 or almost the entire surface of the back plate 3.
The adhesive is applied by the dispenser 10 as shown in FIG.
Here, the aforementioned silicon-modified epoxy adhesive is applied to the back surface of the front plate 2 and the rubber-modified epoxy adhesive is applied to the upper surface of the back plate 3. Next, the front plate 2 is placed on the upper surface of the honeycomb core 1 shown in FIG.
The lower plate 3 is arranged on the lower surface as shown in FIG. 5, and as shown in FIG.
The adhesive is cured by applying a pressure of about 1 to ² kg / mm ² with a pressing device while keeping the temperature between room temperature and about 50 ° C. while holding it horizontally between 1 and 11 and leaving it for about 1 to 5 days. Thus, the aluminum honeycomb panel A can be obtained.

Subsequently, the aluminum honeycomb panel A is shown in FIG.
As shown in the figure, the cutter 12 is cut into a desired size, and a hole for mounting is processed. If necessary, a metal fitting or the like is attached to use it for a plotter board, for example.

[0015]

[Embodiment] Vertical 1 made of JIS5052 Al alloy
A front plate and a back plate having a width of m, width of 1 m and thickness of 1 mm are prepared, respectively, and have a thickness of 0.06 mm, a hexagonal cell of 7.3 mm on each side (cell size 1/2 inch), a length of 1 m, width An aluminum honeycomb panel was assembled by bonding the front plate and the back plate to the front surface and the back surface of a 1 m honeycomb core using an adhesive, respectively. On the back surface of the front plate, an adhesive of MOS 1005 made of Konini, which is a silicon-modified epoxy adhesive, is applied to the entire surface with a dispenser or a roll coater to a thickness of 0.3 mm, and a rubber-modified epoxy adhesive is applied on the upper surface of the back plate. Almost the entire surface was applied to a thickness of 0.3 mm using a dispenser or a roll coater. Next, a front plate is placed on the upper surface of the honeycomb core placed horizontally and a back plate is placed on the lower surface of the honeycomb core, and 2 kg / cm ² is pressed from above and below while the whole is kept horizontal.
, And left for one day to complete the bonding operation, thereby obtaining an aluminum honeycomb panel.

As a comparative panel for this aluminum honeycomb panel, a front plate, a back plate and a honeycomb core of the same dimensions and made of the same material are used, and both the front plate and the back plate are made of the same rubber-modified epoxy adhesive as described above. An aluminum honeycomb panel manufactured by bonding to a honeycomb core, an aluminum honeycomb panel manufactured by bonding both a front plate and a back plate to a honeycomb core with the same silicon-modified epoxy adhesive as described above, and a rubber-modified epoxy An aluminum honeycomb panel manufactured by bonding to the honeycomb core with an adhesive and bonding the back plate to the honeycomb core with a silicon-modified epoxy adhesive was prototyped. The results of a flatness measurement test performed on these aluminum honeycomb panels are shown in Table 1 below. The flatness measurement test is
The range of the maximum and minimum values of numerical values obtained by three-dimensionally measuring 25 points defined on the entire surface of the panel with its own weight, supporting the two sides of the horizontally installed panel with the top plate of the 1 x 1 m aluminum honeycomb panel facing up In mm. Also,
As for the types of panels, sample 1 was obtained by bonding the front plate with a silicon-modified epoxy adhesive and bonding the back plate with a rubber-modified epoxy adhesive (sample of the present invention), and sample 2 was obtained by bonding both the front plate and the back plate. Sample 3 was made with a rubber-modified epoxy adhesive (Comparative sample), Sample 3 was made with a silicone-modified epoxy adhesive for both front and back plates (Comparative sample), Sample 4
In the figure, the front plate was bonded with a rubber-modified epoxy adhesive and the back plate was bonded with a silicon-modified epoxy adhesive (comparative sample).

[0017]

[Table 1]

As is evident from the results shown in Table 1, the panel of Sample 3 in which both the front plate and the back plate are bonded with the silicon-modified epoxy adhesive has a large flatness value and is required for a plotter board. It was found that the standard of 0.3 mm or less could not be satisfied. On the other hand, sample 1
It is clear that the panels of Samples 2 and 4 have a small flatness value.

Next, a noise test was performed on each of the prototype panels with a falling object. 5g iron ball with height 0.
The following Table 2 shows the results of measuring the contact noise generated when the panel was dropped from 13 m to the center of the panel at a position 0.5 m above the center of the panel using a Lion Corporation equivalent sound level meter. Table 2 shows the average noise value and the peak value during a plurality of measurements.

[0020]

[Table 2]

As is evident from the results shown in Table 2, the noise of Sample 1 and Comparative Sample 3 having the structure using the silicon-modified epoxy adhesive according to the present invention is low, and the contact of the iron ball is low. It is clear that the accompanying sound can be suppressed. From the above results, it was clarified that the sample 1 according to the structure of the present invention obtained a high noise suppression effect while securing the flatness and strength required for the plotter board.

[0022]

As described above, according to the present invention, the front plate is adhered to the honeycomb core with a highly viscous silicone-modified epoxy adhesive and the back plate is adhered to a rigid rubber-modified epoxy adhesive. When an object such as a drawing pen for drawing comes into contact with the top plate, the contact sound can be suppressed by the presence of the adhesive layer of the silicon-modified epoxy adhesive on the top plate. Also,
Since the adhesive layer of the silicon-modified epoxy adhesive closes the opening of each hollow portion of the honeycomb core, it is also possible to suppress the resonance sound that tends to resonate in the hollow portion. Further, since the hollow portion on the other side of the honeycomb core is closed by the adhesive layer of the rubber-modified epoxy resin agent, no sound leakage occurs, so that the sound suppressing effect by the adhesive layer of the silicon-modified epoxy adhesive is not impaired. Furthermore, since the honeycomb core and the back plate are firmly joined by the adhesive layer of the rubber-modified epoxy adhesive, necessary rigidity and strength of the entire honeycomb panel can be secured.

[Brief description of the drawings]

FIG. 1 is a perspective view of an aluminum honeycomb panel according to the present invention.

FIG. 2 is a sectional view of a main part of the aluminum honeycomb shown in FIG.

FIG. 3 is a diagram showing a state in which an adhesive is applied to a front plate.

FIG. 4 is a perspective view of a honeycomb core.

FIG. 5 is a diagram showing a state in which a front plate and a back plate are installed on a honeycomb core.

FIG. 6 is a diagram showing a pressed state of the honeycomb core, the front plate, and the back plate.

FIG. 7 is a diagram showing a cutting step of the honeycomb panel.

[Explanation of symbols]

 Reference Signs List A Aluminum honeycomb panel 1 Honeycomb core 2 Front plate 3 Back plate 4 Adhesive layer of silicon-modified epoxy adhesive 5 Adhesive layer of rubber-modified epoxy adhesive 6 Cell 7 Hollow

Claims (2)

[Claims] 1. A metal front plate and a back plate are adhered to front and back surfaces of a honeycomb core via an adhesive layer, and the adhesive layer is provided so as to cover substantially the entire front and back plate sides of the honeycomb core. The adhesive layer interposed between the front plate and the honeycomb core is made of a silicon-modified epoxy adhesive, and the adhesive layer interposed between the back plate and the honeycomb core is made of a rubber-modified epoxy adhesive. An aluminum honeycomb noise suppression panel characterized by the following. 2. Each of the openings on the front side of a large number of hollow portions formed in the honeycomb core is closed by an adhesive layer made of a silicon-modified epoxy adhesive, and each opening on the back side is made by an adhesive layer made of a rubber-modified epoxy resin agent. The aluminum honeycomb sound-absorbing panel according to claim 1, wherein the panel is closed.