JPS6026003B2 - Curved insulation panel forming method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an insulating panel having curved surfaces on both the inside and outside, in which an inner layer portion that directly contacts the wall surface to be insulated and an outer layer portion located on the atmosphere side are integrally connected in an overlapping state. The present invention relates to a forming method for producing a heat insulating panel in which heat insulating materials are stacked in layers.

The heat insulating material layer includes, for example, a heat insulating material layer made of phenol foam made of resin foam mixed with reinforcing fibers, and a heat insulating material layer made only of resin foam, and by overlapping each of these layers, a heat insulating panel is formed. is configured.

Conventionally, when manufacturing such overlapping curved heat insulation panels, both the inner and outer surfaces of each panel-shaped heat insulating material, which has been formed into a fan-flat shape in advance, are
Grinding was performed until the required arc-shaped concave curved surface and arc-shaped convex curved surface were obtained, but it required a special pick-up tool and took a lot of effort. It was very difficult to form.

The purpose of the present invention is to provide a forming method that can significantly improve work efficiency and improve the accuracy of concave and convex curved surfaces when manufacturing the above-mentioned stacked curved heat insulating panels. do. The characteristic structure of the present invention for achieving the above object is that, in a forming method for manufacturing a curved heat insulating panel in a state where heat insulating materials are stacked in layers, A periphery including a heat insulating material pre-formed in the shape of a fan plate between the concave arc-shaped surface and the convex curved surface of the mold, and an opposing green facing the mold in a shape that matches the curved surface of the peripheral part of the mold. After setting the molds, the heat insulating material is preliminarily deformed into a shape close to the required curved surface shape as the molds approach each other, and the heat insulating material, surrounding molds, and the male and female pair of molds are A foamable resin raw material is injected into the closed space formed by one of the two and foamed, and the foaming pressure deforms the insulation material into the required curved shape along the curved surface, and the foamed portion hardens to transform the insulation material. The shape of the curved surface is maintained in a deformed state, and this configuration provides the following effects.

In other words, instead of grinding the heat insulating material to create a curved surface with the desired curvature, a curved heat insulating panel with the desired curvature can be manufactured by combining the pressing action of a mold and the injection foam molding process of foamable resin raw materials. As a result, the work efficiency can be significantly improved compared to conventional grinding work. Then, even if the fan-flat insulation material is pre-deformed in a pair of male and female molds, the foamed resin material injected into the closed molding space was made aware that the insulation material would not conform to the curved surface of the mold accurately. The foaming pressure is used to deform the insulation material into the required curved shape that matches the curved surface of the mold, thereby making it possible to form a curved insulation panel with a curved surface of the required curvature with high precision. Through the forming operation, the heat insulating material foam-molded in the closed space maintains the curved shape of the heat insulating material which has been pre-deformed from the fan-flat shape, and the above-mentioned stacking of heat insulating material layers is performed to improve work efficiency. This enabled molding in a mating format.

Therefore, compared to conventional panels, it has become possible to dramatically improve productivity and to obtain a curved heat insulating panel with a highly accurate curved surface. Hereinafter, first, embodiments of the present invention will be described based on the drawings.

- As shown in FIG. 1, between the arcuate concave curved surface (partial spherical surface) la of the female mold 1 and the arcuate convex curved surface (partial spherical surface) 2a of the male mold 2 placed opposite thereto, A heat insulating material 3 such as a fan flat plate-shaped phenol foam (this usually constitutes the inner layer) and a peripheral mold 4 (see Fig. 2) separably fixed to one side of the insulating material 3 are set, and the heat insulating material 3 is set. 3 and surrounding mold 4
A foamable resin raw material 6' such as polyurethane is injected into the space formed by the above, and before it foams, a flat panel surface protection plate 5 having plasticity such as an aluminum thin plate is attached to the free end of the peripheral mold 4. set.

The heat insulating material 3 is formed by foaming phenol resin or the like with reinforcing fibers mixed therein and pre-forming it into a fan flat plate shape. Further, the peripheral mold 4 includes the pair of male and female molds 1 and 2.
Opposing greens 4a and 4b facing each other are formed in a curved shape so as to match the curved surfaces of the peripheral parts of the molds 1 and 2.
Following the setting of the protective plate 5, as shown in FIG. 3, the pair of male and female molds 1 and 2 are moved closer to each other to bend the heat insulating material 3 and the protective plate 5.

At this time, since the heat insulating material 3 and the protection plate 5 have a certain degree of restoring force, it is difficult to accurately adhere to the convex curved surface 2a and the concave curved surface la, and it is difficult to avoid creating gaps. however,
As shown in FIG. 4, a foamed resin raw material 6' is injected into the space formed by the heat insulating material 3 and the peripheral mold 4, and is covered with a protective plate 5.
foams, and the foaming pressure at this time (approximately 0.5 to 0.8k9/
By crimping springs, etc. provided on the base) and the jig, the heat insulating material 3 is evenly adhered to the convex curved surface 2a over almost its entire surface, and the protection plate 5 is in close contact with the convex curved surface 2a over its entire surface.
adhere evenly to the

As shown in the figure, the outer peripheral part of the heat insulating material 3 projects slightly outward from the surrounding mold 4, and although the foaming pressure is not directly applied to this projecting part, the foaming pressure applied near the inside of the peripheral mold 4 As the pressure deforms the heat insulating material 3 in this vicinity, the slightly protruding portion is also deformed accordingly, so that this protruding portion also comes into close contact with the convex curved surface 2a. Then, after a predetermined period of time has elapsed, the foamed resin raw material 6' is cured, so that a foam 6 integrally connected to the heat insulating material 3 and the protection plate 5 is formed.

By this hardening of the foam 6 and the integral connection, the heat insulating material 3 and the protection plate 5 are maintained (fixed) in a flat and close contact state with the convex curved surface 2a and the concave curved surface la. Next, when both the molds 1 and 2 are separated and the peripheral mold 4 is removed, a heat insulating material 3, a foam 6,
A curved heat insulating panel A is obtained in which the protection plate 5 is integrated and both the inner and outer surfaces thereof are partially spherical.

This panel A is used in order to exhibit insulation work for the tank by attaching a large number of these panels to a spherical tank.

Note that the present invention may be practiced by removing the protective plate 5 in the above example.

Furthermore, the heat insulating material 3 may be placed on the female mold 1 side and formed in the same manner as in the above example, thereby forming the heat insulating material 3 in close contact with the concave curved surface la.

Moreover, in any case, it may be applied to molding into a partially cylindrical surface as well as into a partially spherical shape.

[Brief explanation of drawings]

The drawings show an embodiment of the method for forming a curved heat insulating panel according to the present invention, and FIG. 1 is a sectional view before mold clamping, FIG. 2 is a perspective view of a portion, FIG. 3 is a sectional view in a mold clamped state, and FIG. The figure is a cross-sectional view of the foamed state, and FIG. 5 is a perspective view of the finished product. 1...Female mold, la...Concave curved surface, 2...
...Male mold, 2a...Convex curved surface, 3...
...Insulation material, 4...Peripheral mold, 5...
・Surface protection plate. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. A molding method for manufacturing a curved heat insulating panel in a state in which heat insulating materials are stacked in layers, wherein a pair of male and female molds 1 and 2 are arranged in an arcuate shape with a gap between them. Between the concave curved surface 1a and the arcuate convex curved surface 2a, a heat insulating material 3 formed in advance in the shape of a flat plate and opposing edges 4a, 4b facing the molds 1, 2 are attached to the periphery of the molds 1, 2. After setting a peripheral mold 4 having a shape that matches the curved surface, the heat insulating material 3 is preliminarily deformed into a shape close to the required curved shape as the molds 1 and 2 approach each other, and A foamable resin raw material is injected into a closed space formed by the heat insulating material 3, the peripheral mold 4, and one of the pair of male and female molds 1 and 2 and is foamed, and the foaming pressure causes the heat insulating material 3 to be A method for forming a curved heat insulating panel, which comprises deforming the heat insulating material 3 into a required curved shape along the curved surface 2a or 1a, and maintaining the shape of the heat insulating material 3 in the curved deformed state by curing the foamed portion. 2. On the opposite side of the peripheral mold 4 from the heat insulating material 3,
2. The method of forming a curved heat insulating panel according to claim 1, wherein the panel surface protection plate 5, which can be plastically deformed into a curved surface by the foaming pressure, is set, such as an aluminum thin plate, and then injection foaming is carried out.