JP5380766B2 - Honeycomb sandwich panel with soundproofing properties - Google Patents

Description

  The present invention relates to a honeycomb sandwich panel having soundproofing properties used for vehicle floors, aircraft floors, and the like. More specifically, it has improved sound transmission properties and has soundproofing properties with high strength, low weight and nonflammability. The present invention relates to a honeycomb sandwich panel provided.

  In general, there are various materials such as soundproof walls and soundproof floors as building materials for quietness to sound. Especially in the case of floorboards used for vehicle floors, aircraft floors, etc., in addition to improving soundproofing characteristics. Therefore, it is desired to be a non-combustible material in order to prevent fires and the like with high strength and low weight.

  By the way, as a conventional floor board, there is known a honeycomb sandwich panel in which an upper surface plate and a lower surface plate are fixed to upper and lower surfaces of a honeycomb core through fixing means. As shown, a honeycomb core 1 made of an aluminum plate and an upper plate 2 and a lower plate 3 made of an aluminum plate are laminated on the upper and lower surfaces of the honeycomb core 1 with fixing means 4 such as an adhesive. Alternatively, as shown in FIG. 7, a honeycomb core 1 made of an aluminum plate and an upper surface plate 2 made of an aluminum plate are fixed to the upper surface of the honeycomb core 1 through fixing means 4, and an adhesive is attached to the lower surface of the honeycomb core 1. A rubber plate 5 is fixed via a fixing means 4 such as a lower plate 3 made of an aluminum plate or a fiber reinforced plastic (FR). ) It has also been proposed which is constructed the lower plate 3a is laminated consisting of (e.g., see Patent Document 1).

However, the former honeycomb core 1 and the upper and lower plates 2 and 3 made of aluminum plates are low in weight, but are not satisfactory in terms of sound insulation characteristics (sound insulation performance and vibration control performance). A material obtained by laminating the lower surface plate 3 made of an aluminum plate and the lower surface plate 3a made of fiber reinforced plastic (FRP) on the surface of the rubber plate 5 is good in strength and soundproofing properties (sound insulation performance and vibration control performance). However, in the combustibility of the component parts, it was not possible to satisfy the requirements exceeding the extreme flame retardancy, and there was a problem in adopting it to the vehicle floor.
JP-A-6-190957

  The present invention pays attention to such conventional problems, and an object of the present invention is to provide a honeycomb sandwich panel that has high strength, low weight, nonflammability, and further has soundproofing characteristics with improved transmission loss. .

In order to achieve the above object, the present invention fixes upper and lower plates made of an aluminum alloy plate to the upper and lower surfaces of a honeycomb core made of an aluminum alloy plate and generates sound from the upper plate or the lower plate. By means of a fixing means via an intermediate member which is provided with irregularities of a predetermined height on the surface of the metal plate on one side of the face plate and forms an intermediate layer having a thickness of 0.5 to 5 mm between the face plate The gist is that the metal plate is fixed.

  Here, the honeycomb core and the upper surface plate and the lower surface plate are formed of an aluminum-based alloy plate, the metal plate is an iron-based alloy plate, and the fixing means for the metal plate further includes rivets, tapping screws, screws, One selected from adhesive, double-sided tape and brazing is used.

  In another honeycomb sandwich panel of the present invention, an upper surface plate and a lower surface plate made of a metal plate are fixed to the upper and lower surfaces of a honeycomb core made of a light metal plate, and fixed to one of the upper surface plate or the lower surface plate on the sound source side. The gist is that the metal plate is fixed through the means.

  Here, the honeycomb core is formed of an aluminum-based alloy plate, the upper surface plate, the lower surface plate, and the metal plate are formed of an iron-based alloy plate, and the fixing means includes a rivet, a tapping screw, a screw, an adhesive, One selected from double-sided tape and brazing is used.

  By comprising in this way, the permeation | transmission loss per weight can be improved, it is especially high intensity | strength, a low weight, and nonflammability, and a permeation | transmission loss can be improved further.

According to the present invention, the upper surface plate and the lower surface plate made of the aluminum alloy plate are fixed to the upper and lower surfaces of the honeycomb core made of the aluminum alloy plate as described above, and the sound generating side of the upper surface plate or the lower surface plate is fixed. The metal plate is fixed by a fixing means via an intermediate member which is provided with irregularities having a predetermined height on the surface of the metal plate on one side of the plate and forms an intermediate layer having a thickness of 0.5 to 5 mm with the face plate. Since this is fixed, the following excellent effects can be obtained.
(a) The soundproofing characteristics can be improved by improving the transmission loss.
(b) High strength, low weight and nonflammability, especially effective for soundproof floorboards used for vehicle floors, aircraft floors, etc.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
Note that the same components as those in the conventional example are denoted by the same reference numerals and description thereof is omitted.

FIG. 1 is a cross-sectional view of a honeycomb sandwich panel according to a first embodiment of the present invention. In this embodiment, an upper surface plate 2 and a lower surface plate 3 made of an aluminum-based alloy plate containing aluminum as a main component are not shown. and fixed through the means, the lower surface plate 3 made with the tone generator (generated side tone of the upper plate or lower plate in this embodiment), the predetermined thickness t (e.g., 0.5 mm to 5 mm) A metal plate 7 made of an iron alloy plate is fixed via an intermediate member 6 via fixing means 8.

  As the intermediate member 6, a plurality of laminated flame-retardant sheet-like fiber materials, for example, glass fibers (in this embodiment, four sheets are laminated, but the number is not limited). As shown in FIG. 2, a predetermined number of flame-retardant sheet-like fiber materials 6a are laminated and arranged at arbitrary intervals to form the lower surface plate 3 as shown in FIG. It is also possible to fix by the fixing means 8 while being sandwiched between the metal plate 7 and the metal plate 7.

  Further, as another embodiment of the intermediate member 6, it is possible to configure it by a metal plate 7 provided with unevenness 6 b having a predetermined height on the surface as shown in FIG. 3, and also in this embodiment, An intermediate layer 9 having a predetermined thickness can be formed between the lower surface plate 3 and the metal plate 7. In the third embodiment, the lower surface plate 3 and the metal plate 7 are fixed by fixing means 8 (not shown) with the intermediate layer 9 interposed therebetween.

  The aluminum-based alloy plate is an aluminum-based alloy plate such as aluminum or duralumin, and the iron-based alloy plate is an iron-based alloy plate such as steel, stainless steel, or maraging steel. It is. As the fixing means 8, one selected from rivets, tapping screws, screws, adhesives, double-sided tape and brazing is used. In this embodiment, a rivet is used as the fixing means 8.

  Moreover, in each said embodiment, if the intermediate member 6 is a high intensity | strength, a low weight, and a nonflammable thing, it will not be specifically limited to said embodiment.

[Transmission loss evaluation test]
(1) Test method
This was carried out based on JIS A 1416-2000 “Measurement method of air sound insulation performance of building materials in the laboratory”. The measuring instrument / measurement method was performed by the method shown in FIG.
Specimen size: 1000 x 2000 (mm)

(2) Evaluation test As a result of performing the transmission loss evaluation test based on each of the embodiments as described above, the transmission loss was improved as shown in the graph explanatory view of FIG.

  That is, graph A is a conventional honeycomb sandwich panel, graph B is a comparative example in which an iron-based alloy plate is fixed to the lower surface plate 3, and graph C is an iron-based alloy plate via an intermediate member 6 having a predetermined thickness t on the lower surface plate. This is an embodiment of the present invention in which a metal plate made of is fixed through fixing means.

  As is clear from this graph explanatory diagram, when a metal plate made of an iron-based alloy plate is fixed to the lower surface plate via an intermediate member having a predetermined thickness t, transmission loss is improved at all frequencies. I found out.

It is sectional drawing of the honeycomb sandwich panel which shows 1st Embodiment of this invention. It is sectional drawing of the honeycomb sandwich panel which shows 2nd Embodiment of this invention. It is sectional drawing of the honeycomb sandwich panel which shows 3rd Embodiment of this invention. It is graph explanatory drawing of the result of having conducted the transmission loss evaluation test about the Example of this invention. It is explanatory drawing of the measuring method which performs the transmission loss evaluation test of a honeycomb sandwich panel. It is sectional drawing of the conventional honeycomb sandwich panel. It is sectional drawing of the other conventional honeycomb sandwich panel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Honeycomb core 2 Upper surface plate 3 Lower surface plate 4 Fixing means 5 Rubber plate 6 Intermediate member 6a Sheet-like fiber material 6b Concavity and convexity 7 Metal plate 8 Fixing means 9 Intermediate layer

Claims (2)

In the honeycomb sandwich panel formed by fixing the upper surface plate and the lower surface plate to the upper and lower surfaces of the honeycomb core through fixing means,
An upper surface plate and a lower surface plate made of an aluminum alloy plate are fixed to the upper and lower surfaces of a honeycomb core made of an aluminum alloy plate, and a metal is placed on one face plate side of the upper surface plate or the lower surface plate on which sound is generated. A metal plate is fixed by a fixing means through an intermediate member that is provided with irregularities having a predetermined height on the surface of the plate and forms an intermediate layer having a thickness of 0.5 to 5 mm between the plate and the face plate. Honeycomb sandwich panel with soundproofing properties.   The honeycomb sandwich panel with soundproofing characteristics according to claim 1, wherein the metal plate fixing means uses one selected from rivets, tapping screws, screws, adhesives, double-sided tape and brazing.

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