JP3263192B2 - Cladding metal plate excellent in shape and method of using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clad metal plate constituting an outer wall panel of a building and a method of using the same.

[0002]

2. Description of the Related Art Cladding metal panels constituting the outer wall of a structure such as a building are widely used due to their excellent heat insulating properties and beautiful appearance. However, since the thickness distribution between the front-side metal plate and the back-side metal plate corresponding to the outer surface of the building that is directly heated by sunlight etc. is not appropriate, large warpage occurs due to thermal expansion on the front side. Has become. In order to solve this problem,
In Japanese Patent Application Laid-Open No. 06021, there is an example in which the surface material subjected to thermal deformation is specially devised so as to slide between the underlying material,
Requires a special structure. As means for increasing the resistance to warpage of the panel, for example, as shown in FIG. 2A, a reinforcing beam 4 is attached to the back metal plate 1 of the clad metal plate 10, or as shown in FIG. 2B. In addition, measures such as increasing the thickness of the clad metal plate 10 and the thickness of the intermediate heat insulating material and adding a reinforcing plate 5 have been adopted. However, the weight of the clad metal plate is intended to be reduced in construction, and It is not advisable to attach the reinforcing beam 4 or increase the plate thickness.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to prevent a problematic deformation of a panel due to thermal expansion without increasing the weight.

[0004]

SUMMARY OF THE INVENTION The present invention is a three-layer clad plate in which a heat insulating material is sandwiched between an intermediate layer and thin metal plates laminated on the front and back surfaces thereof. Is 2
It is a clad metal plate excellent in shape, characterized by being in the range of ~ 3. The method of using the metal plate is characterized in that the side where the thickness of the metal plate is small is used in accordance with the use environment side where the temperature change is large.

[0005]

The present inventors change the thickness of the front and rear metal plates and the thickness of the intermediate heat insulating material such as a gypsum board sandwiched between the metal plates to increase the temperature of the metal plate on the front surface side, and warp the metal plate. investigated. First, the mechanism of warpage due to thermal expansion will be described. As shown in FIG. 3A, the surface metal plate 3 of the panel heated by sunlight or the like tends to expand by thermal expansion, but as shown in FIG. Since the back metal plate 1 acts so as to prevent its elongation, warpage occurs such that the front metal plate 3 has a convex shape. Naturally, the warpage increases as the temperature increases. The warpage is bending deformation. To prevent this, the plate thickness of the metal plate and the heat insulating material may be increased from the principle thereof.
However, this is contrary to the intention of weight reduction. Therefore, prior to the experiment, the effect on warpage was investigated by thermal stress analysis. The analysis method considers the front surface metal plate 3, the back surface metal plate 1, and the heat insulating material 2 as schematically shown in FIG.
Only when a given temperature was given, the warpage was calculated. Thickness t ₃ of the surface metal plate 3 parameters underlying the dimension of the conventional panel, each of the plate thickness t ₁ of the back metal plate 1 0.48
mm, Young's modulus is 21000 kgf / mm ² , heat insulating material 2
Thickness t ₂ and Young's modulus of 6.3 mm and 230 k, respectively.
gf / mm ² .

First, when the Young's modulus E of the heat insulating material 2 is increased,
FIG. 5 shows the results of the case. Warpage h is the long side of the actual panel
The height at the center when connected by a straight line. As shown in FIG.
Thus, as the Young's modulus E increases, the warpage h decreases.
You. Gypsum board is relatively cheap as insulation 2
And its Young's modulus is 230 kgf / mm
^Two It is. Insulation with the same price and performance but a large Young's modulus
If there is material, it will be one of the measures, but the gist of the present invention is
To prevent warpage without increasing prices.
Therefore, the selection of thermal insulation is excluded from consideration.

FIG. 6 shows the effect of changing the thickness t ₃ of the surface metal plate 3 on warpage. Warp and plate thickness t ₃ small decreases as shown in the figure, also it can be seen that warp even if the plate thickness t ₃ greater decreases. The thickness of the conventional material, ironically, is the most warped. The effect on the warp of the case of changing the thickness t ₁ of the back metal plate 1 shown in FIG. As shown in the figure, it can be seen that the warpage decreases as the plate thickness increases. Based on this newly obtained knowledge, the sum of the front and back plate thicknesses (t ₁ + t ₃ ) is made constant, and the plate thickness ratio (t
₁ / t ₃ ) is shown in FIG. As shown in the figure, it is clear that the warpage decreases as the plate thickness ratio (t ₁ / t ₃ ) increases.

It is to be noted that the thinner the surface metal plate 3 is, the more effective it is against warpage. However, as is well known, the cost of reducing the thickness by rolling is increased. Considering that the shape defects such as so-called ear elongation or medium elongation are likely to occur sometimes, and that the surface material is reduced in thickness due to rust when using panel products, the practical thickness is 0 .25 mm or more is appropriate.

In order not to increase the total weight (plate thickness) of the grading material from the present time, when t ₃ = 0.25 mm is minimized, (t ₁ / t ₃ ) ≦ 3. (T ₁ / t ₃ ) is 2
If it is less than 1, warpage becomes large, so that (t ₁ / t ₃ ) ≧ 2 is preferable.

[0010]

EXAMPLE An example using a clad metal plate shown in Table 1 will be described below. No. 1 in Table 1. 1 to No. 3
No. is a clad metal plate having a thickness ratio between the front surface and the back surface within the range of the present invention. 4 is a conventional clad metal plate. By the way, No. Reference numeral 3 denotes a clad metal plate in which the total thickness of the front and back surfaces is reduced as compared with the conventional material, and the weight is reduced by 6%.

As in the case of the conventional clad metal plate, a front and back surface material was a cold rolled steel plate (JIS-SPCC), and a commercially available gypsum board was used as an intermediate material as a heat insulating material. The front and back materials and the intermediate material were bonded with an epoxy resin. The dimensions of the clad metal plate are 2438 mm × 1220 mm, and the respective plate thicknesses are as shown in Table 1. The Young's modulus of the front and back materials and the heat insulating material are 21000 kgf / mm ² and 230 kgf /
mm ² . The surface metal plate is heated to 80 ° C with a large dryer
The target was heated and the warpage was measured. The back metal plate has a warped shape in which it is concave, but the long side of 2438 mm is tied with a thread and the amount of warpage is measured by the amount of depression in the center. The measurement results are as shown in Table 1, and the examples show excellent performance.

[0012]

[Table 1]

[0013]

According to the present invention, a clad metal plate having a triple structure with less bending deformation due to thermal expansion can be obtained without increasing the weight.

[Brief description of the drawings]

FIG. 1 is a graph showing a relationship between a sheet thickness ratio and warpage.

FIG. 2 is an explanatory diagram showing a conventional warpage countermeasure.

FIG. 3 is an explanatory diagram of warpage.

FIG. 4 is an analysis diagram of a warp of a clad metal plate.

FIG. 5 is a graph showing the relationship between Young's modulus and warpage of a heat insulating material.

FIG. 6 is a graph showing a relationship between a change in thickness of a surface metal plate and warpage.

FIG. 7 is a graph showing the relationship between the thickness of a back metal plate and warpage.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 back metal plate 2 heat insulating material 3 front metal plate 4 reinforcing beam 5 reinforcing plate 6 sunlight 10 clad metal plate

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-40189 (JP, A) JP-A-7-256659 (JP, A) JP-A-2-182446 (JP, A) 171931 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B32B 15/00-15/20 E04F 13/12

Claims (2)

(57) [Claims] 1. A three-layer clad plate comprising a heat insulating material sandwiched between an intermediate layer and a thin metal plate laminated on the front and back surfaces thereof, wherein the thickness ratio of the front and back surfaces of the metal plate is in the range of 2-3. A clad metal sheet with excellent shape characteristics. 2. The method for using a clad metal sheet having excellent shape according to claim 1, wherein the thin metal sheet is used in accordance with the use environment side where the temperature change is large.