JP2000141515A - Curved surface-like brazing sandwich panel and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a curved surface-like brazing sandwich panel for maintaining a brazing connecting state between a rectangular form constituted of a frame material to be bent and a frame not to be bent and a surface plate. SOLUTION: In the curved surface-like sandwich panel obtained by disposing a predetermined core 2 at an inside of a rectangular frame 4 by using the frame 4 obtained by integrally connecting in combination two R frames 4a to be bent and two S frames 4b not to be bent, sandwiching the frame 4 and the core 2 between two surface plates 6 and bending the overall panel by bending in one direction, the materials 4b for giving such a frame 4 is constituted of the frame having lower compression strength than that of the material 4a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a curved brazing sandwich panel and a method of manufacturing the same, and more particularly, to improving a frame material constituting a rectangular frame in such a curved brazing sandwich panel to improve a face plate and a brazing sandwich panel. The present invention relates to a technique for improving the brazing bondability between them.

[0002]

2. Description of the Related Art Brazing sandwich panels such as brazing honeycomb panels, which have been used as structural materials and strength members in construction materials, vehicles such as railway vehicles and automobiles, and also in aerospace applications and the like, have conventionally been used. For example, as disclosed in Japanese Patent Application Laid-Open No. 5-138778, a predetermined core such as a honeycomb core, which is a core material having a predetermined thickness and provided with cells in a honeycomb shape, is used. It has a structure in which a rectangular frame that is arranged outside so as to surround it is sandwiched between the upper and lower two face plates and brazed to the face plates. The frame material that constitutes the rectangular frame has a square cross-sectional shape because of its lightness, ease of brazing, and ease of processing and mounting of the panel after brazing. Hollow shape Cylindrical workpiece exhibiting b-shaped cross section when is mainly used, the four are combined in a rectangular shape, by being allowed to integrally joined, there is a rectangular frame body.

[0003] By the way, such a brazed sandwich panel is generally provided as a flat panel in which the entire panel has a flat plate shape, and has a curved surface shape in which the entire panel is curved in one direction. Panels, so-called curved panels, are provided for various uses.
(A) and (b) show an example of such a curved panel.

That is, in FIG. 1A, reference numeral 2 denotes a honeycomb core as a plate-shaped core having a predetermined thickness (height). Around this honeycomb core 2, a hollow extrusion having a square cross-sectional shape is provided. A rectangular frame 4 composed of four frame members made of a profile is arranged. In other words, the honeycomb core 2 is housed and arranged inside such a rectangular frame 4. The rectangular frame 4
As shown in FIG. 1 (b), two R frame members 4a, 4a curved by a bending process to be described later are combined with straight S frame members 4b, 4b that cannot be curved. The rectangular frame body 4 and the honeycomb core 2 housed inside the rectangular frame body 4 are integrally joined in a rectangular form.
In addition, each of the panels is integrally formed by brazing and joined together, and the entire panel is bent in one direction by the shape of the curved rectangular frame 4. It is.

[0005] Such a curved panel is generally subjected to brazing and heating and bending to obtain a predetermined curved panel as disclosed in Japanese Patent Application Laid-Open No. 8-174111. It can be advantageously manufactured according to the molding method. Specifically, as shown in FIG. 2, a flat panel assembly obtained by combining the honeycomb core 2, the rectangular frame 4, and the face plate 6 is placed in an appropriate heating furnace such as a vacuum furnace. In addition, brazing and heating are performed, and such a flat panel assembly is pressed, for example, as shown in FIG. 3, by pressing surfaces 14 of upper and lower press jigs 10 and 12 corresponding to a target curved shape. , 16, a method of performing a bending process by applying pressure to form a panel having a curved surface with a predetermined curved shape is adopted.

However, when manufacturing a curved honeycomb panel (FIG. 1) from a flat panel assembly according to such a manufacturing method, it corresponds to the initial force point position of bending shown as A in FIG. The edge of the R frame material 4a to be bent in the rectangular frame 4 of the panel is subjected to a concentrated load, and such a load causes the R frame member 4a to be bent as shown in FIG.
The end portion of the frame member 4a is locally crushed, and the height thereof is reduced. That is, R frame material 4a and S
The frame member 4b has the same height: H. However, the edge of the R frame member 4a receives a concentrated load, and crushing deformation is caused. The height of the edge of the R frame member 4a becomes: Such R frame member 4a is larger than h.
, That is, the height: H of the S frame material 4b that is not to be bent is relatively higher,
At the time of completion of the bending, as shown in FIG. 4, a gap 18 is formed between the lower surface of the edge portion of the R frame member 4a to be bent and the lower surface plate 6, and the brazing failure occurs there. The problem is inherent.

[0007] The occurrence of poor bonding on the brazing surface on such a rectangular frame 4 impairs the quality of the resulting curved brazing sandwich panel,
In addition, a reduction in the yield is caused, and the cost of the panel itself is increased due to the addition of the repair man-hours and the like.

[0008]

Here, the present invention has been made in view of such circumstances, and an object of the present invention is to provide a bending target which is subjected to bending in a bending process performed together with brazing heating. The difference between the height of the edge of the frame material and the height of the S frame material not to be bent is advantageously eliminated or reduced, and the difference between the rectangular frame body and the face plate formed of the frame materials is reduced. It is an object of the present invention to provide a curved brazing sandwich panel which maintains a good brazing condition and a method of manufacturing the same.

[0009]

According to the present invention, in order to solve such a technical problem, two R frame members to be bent and two S frame members not to be bent are used. In a rectangular form obtained by arranging and combining the respective frame members in parallel with each other, using a rectangular frame obtained by integrally joining, a predetermined core is arranged inside the rectangular frame, and the rectangular In a curved sandwich panel in which a frame and a core are sandwiched between two face plates and brazed to the face plates, and the entire panel is bent in one direction by bending, the rectangular frame is The gist of the present invention is a curved brazing sandwich panel, wherein the S frame material to be provided is made of a frame material having a compressive strength lower than that of the R frame material.

Further, in the present invention, in order to manufacture the above-mentioned curved brazing sandwich panel, a curved brazing sandwich panel in which the whole panel is curved in one direction. In the method of manufacturing, each of two R frame members to be bent and two S frame members not to be bent having a compressive strength lower than that of the R frame member are combined with each other. Are arranged in parallel with each other, and in a rectangular form, a rectangular frame obtained by integrally joining is used, and a predetermined core is arranged inside the rectangular frame. Is sandwiched between two face plates and heated, and pressed between upper and lower press jigs having a pressing surface corresponding to a target curved shape, so that the rectangular frame, the core, and the face plate are mutually moved. Brazing together Together occupied combined, also a method for manufacturing a curved brazing sandwich panels, characterized in that make a panel having a curved surface of a predetermined curved shape, it is an gist thereof.

As described above, in the curved brazing sandwich panel according to the present invention and the method of manufacturing the same, the R frame member and the S frame member which provide the rectangular frame constituting such a panel are provided.
In relation to the frame material, disposed at a right angle to the R frame material, than the compressive strength of the R frame material to be bent,
Since the compressive strength of the S frame material not to be bent is reduced, it becomes possible to easily deform the cross-sectional shape of the S frame material during bending.
Even if the edge of the R frame material is crushed and deformed and its height is reduced, the S frame material can also be deformed by bending, and the height change between the two frame materials is eliminated or suppressed. By doing so, it is possible to prevent a gap from being formed between the lower surface plate and the lower surface of the edge portion of the rectangular frame, particularly the R frame material, and to maintain a good brazed joint state therebetween, thereby achieving the desired condition. This makes it possible to advantageously obtain a brazed sandwich panel having a curved surface shape.

According to one of the preferred embodiments of the curved brazed sandwich panel and the method for manufacturing the same according to the present invention, the R frame member and the S frame member each have a hollow extruded shape having a square cross section. A side wall portion of the hollow extruded section providing the R frame member, wherein a thickness of a side wall portion located at least outside the rectangular frame body of the hollow extruded section providing the S frame member is provided. Will be thinner than the thickness. As described above, by reducing the thickness of the side wall portion of the S frame material, the compressive strength thereof is effectively reduced, so that the cross sectional shape of the S frame material at the time of bending can be easily deformed. .

Further, in the present invention, in order to reduce the rigidity of the S frame material and reduce its compressive strength, as a measure for changing the cross-sectional shape of the frame material, in addition to the above, such S frame material is formed by using A hollow extruded profile having a cross-sectional shape, and a side wall portion of the hollow extruded profile located at least outside the rectangular frame is provided with a groove extending in the longitudinal direction of the hollow extruded profile, Alternatively, a configuration in which a plurality of through holes are provided in the side wall portion at regular intervals in the longitudinal direction of the hollow extruded shape member may be appropriately adopted.

Further, in the present invention, in order to reduce the rigidity of the S frame material and reduce the compressive strength, there is also a measure for changing the aluminum material constituting such a frame material, particularly the temper. It is preferable that the R frame material and the S frame material are each made of a frame material made of aluminum or an alloy thereof, and the tempers of the frame materials are different. In general, the R frame material is a T material, while the S frame material is preferably an O material.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As is well known, a curved brazing sandwich panel to which the present invention is applied has a large number of cells of a predetermined shape such as a hexagonal shape or a circular shape extending in the vertical direction. In this manner, a core having a predetermined height (thickness) arranged in the horizontal direction and a rectangular frame disposed at the same height and surrounding the core so as to surround it are sandwiched between two upper and lower face plates. And has a structure in which the entire panel is bent in one direction while being brazed to the face plates, and is generally formed as a curved panel as shown in FIG. 1 (a). In general, aluminum or an alloy thereof is made of a material, and in a shape presenting a rectangular shape as a whole, it is advantageous as a structural material or a strength member in a building material, a railway vehicle, an automobile, and a field of aerospace. It is needed.

The present invention provides a curved brazing sandwich panel having such a structure, in which the rigidity of the S frame material among the R frame material and the S frame material constituting the rectangular frame body is reduced. FIG. 5 shows several examples of the S frame material which is designed to reduce the compressive strength and realize such characteristics.

That is, in the curved panel as shown in FIG. 1 (a), the rectangular frame 4 constituting the same generally has the same peripheral wall thickness in terms of its extrudability and cost. Four hollow extruded members having a simple b-shaped cross-section are used, and two of them are R to be bent.
As shown in FIG. 1 (b), while the frame material 4a is used as an S frame material 4b which is not subjected to bending, the other two materials are arranged in parallel with each other and combined in a rectangular form. , Which are joined together,
The S frame member 4b according to the present invention shown in FIG. 5 (a) has three walls formed of the same thickness as the R frame member: T, while the other side wall is one side wall. Part is thin (thickness: t)
Has a cross-sectional shape of a wall portion,
The rigidity of the S frame member 4b is reduced, and the compressive strength is reduced.

Specifically, in the S frame member 4b shown in FIG. 5A, a side wall portion (shown as 4bo in FIGS. 1 and 2) located outside the rectangular frame 4 is shown. Is thinner than the thickness of the side wall portion 4bi located inside the rectangular frame 4, that is, the R frame member 4
The thickness is smaller than the thickness (T) of the side wall portion of a, so that the sectional shape thereof can be more easily deformed than the R frame member 4a.

The thin side wall portion 4 of the S frame member 4b
The thickness of the bo: t is appropriately selected according to the degree of compressive strength required for the entire S frame member 4b, particularly for the outer side wall portion 4bo, but in general, the R frame member is generally used. 20 of thickness of side wall portion of 4a (thickness of inner side wall portion: T)
The ratio is set to about 80% (t = 0.2T to 0.8T). Be careful, such a thin side wall 4bo
If the thickness of t is too small, there will be problems such as difficulty in extrusion processing, and if the thickness exceeds 0.8 T, the effect of reducing the thickness cannot be sufficiently exhibited. is there.

In the example shown in FIG. 5 (a), only the side wall 4bo located outside the rectangular frame 4 is made thin. The side wall 4bi to be located can also be made thinner,
Thereby, there is an advantage that the compressive strength of the S frame member 4b can be further reduced. However, when a curved panel is used as a structural material, a strength member, or the like, it is desirable to set the thickness of the inner side wall 4bi to be the same as the thickness of the side wall of the R frame member 4a. An S frame member 4b having a cross-sectional shape as shown in FIG. 5 (a) is advantageously used.

In the present invention, as shown in FIGS. 5B and 5C, the sectional shape of the S frame member 4b is changed in place of at least the thinning of the side wall 4bo as described above. It is also possible to adopt such a configuration. Where,
The S frame member 4b is formed of a hollow extruded profile having a B-shaped cross-sectional shape, and is provided on a side wall portion 4bo located at least outside the rectangular frame 4 of such a hollow extruded profile in the longitudinal direction. Groove 20 extending in the direction shown in FIG.
(B)] In such a side wall portion 4bo, a plurality of through holes 2 are formed.
Are provided at regular intervals in the longitudinal direction thereof (FIG. 5 (c)).

The side wall 4b of the S frame 4b
For forming the groove 20 and the through hole 22 for o, a known method such as a simultaneous forming method by machining or extrusion may be appropriately adopted, and by forming such a groove 20 or the through hole 22, the side wall thereof may be formed. The compressive strength of the portion 4bo can be effectively reduced.

The width and depth of the groove 20 in FIG. 5B, the size and shape of the through hole 22 in FIG.
The arrangement interval and the like are appropriately selected according to the degree of reduction in the compressive strength. For example, the S frame member 4b formed in the groove 20
Thin portion of side wall 4bo (thickness of bottom wall of groove 20)
Is advantageously about the thickness (t) of the side wall portion 4bo shown in FIG. 5A, and such a groove portion 20 is formed not only from the outside but also from the inside of the B-shaped cross-sectional shape. Further, the grooves 20 and the through holes 22 are
It can also be provided for the side wall portion 4bi that will be located inside the rectangular frame 4.

Further, in the present invention, in order to reduce the compressive strength of the S frame member 4b, the R
The frame member 4a and the S frame member 4b are each formed of a frame member made of aluminum or an alloy thereof,
It is also an effective measure to make the tempers of the frame members different from each other. For example, a tempered frame material such as an O material or a T material can be used. Frame material 4
a, while having low rigidity is used as the S frame material 4b.
It will be used as. Among them, in the present invention, a T material is suitably used as the R frame material 4a, while an O material is suitably used as the S frame material 4b. Of course, the R frame material 4a and the S frame material 4b
It is needless to say that each of these can be selected from various T materials and used.

The above-described measures for reducing the compressive strength can be employed alone, or a plurality of them can be combined to achieve a more effective reduction in the compressive strength. For example, the structure shown in FIG. 5A, FIG. 5B or FIG.
5A, 5B, and 5C can be appropriately combined.

By the way, when the intended curved brazing sandwich panel is manufactured using the S frame member 4b as described above, such an S frame material is used in the same manner as in the prior art.
By combining two of the frame members 4b and two of the predetermined R frame members 4a, in a rectangular form in which the respective frame members are arranged in parallel with each other, the rectangular frame body is integrally joined. In this case, the S frame member 4b having a reduced compressive strength is formed as a frame member not to be bent, and at least a part of the side wall portion 4bo of the S frame member 4b is formed. Are arranged outside the rectangular frame 4 and the R frame member 4a is a frame member to be bent.

Next, using the rectangular frame 4 thus obtained, a core having a predetermined thickness (for example, FIG.
While the honeycomb core 2) as shown in FIG. 1 is disposed, the rectangular frame 4 and the core (2) are provided on a face plate 6 such as a single-sided aluminum brazing sheet in which a brazing material layer having a predetermined thickness is provided on one side of an aluminum substrate. The two braided pieces are sandwiched from above and below to form a panel assembly as shown in FIG. 2, and then heated in an appropriate heating furnace such as a vacuum furnace to perform a normal brazing operation. As shown in FIG. 3, the pressing surface 14 corresponding to the target curved shape,
By pressing and bending a flat panel assembly composed of the rectangular frame 4, the core (2), and the face plates 6, 6 between the upper and lower press jigs 10, 12 having The rectangular frame 4, the core (2) and the face plate 6 are integrally brazed to each other and formed into a sandwich panel having a curved surface with a predetermined curved shape. Here, the order of the brazing operation and the bending process is appropriately selected, but in general, a predetermined bending process is performed to obtain a panel assembly having a curved surface with a predetermined curved shape. Thereafter, a method of performing brazing to obtain an integrated brazing panel will be adopted. Of course,
It goes without saying that a system in which the brazing operation and the bending are performed simultaneously can also be adopted.

Here, the core (2) constituting the above-mentioned panel assembled body is the same as the conventional one, and is formed by polymerizing a bent aluminum sheet or aluminum brazing sheet to form a honeycomb core or the like. In combination with the shape of In the above-mentioned brazing and joining operation, it is desirable to simultaneously join and integrate the polymer of the folded sheet constituting such a core (2), but it is also desirable to join them together in advance to form an integral body. Using the core (2) with a simple structure,
As described above, it is also possible to braze each member to each other.

In the curved brazing sandwich panel thus obtained, the edge of the panel frame material corresponding to the initial force point position of bending (position A in FIG. 3) in the bending process. Specifically, in the illustrated rectangular frame 4, the upper surface edge of the R frame member 4 a receives a concentrated load and is crushed and deformed as shown in FIG.
Even if the frame material height (h) is reduced, the rigidity of at least the outer side wall portion 4bo of the S frame material 4b constituting the rectangular frame 4 is reduced, and the compressive strength is reduced. As the bending process progresses, the S frame material 4b
Can be easily deformed.

Accordingly, since the height (H) of the S frame member 4b is also reduced, the difference in height from the R frame member 4a is eliminated.
Thus, generation of a gap between the rectangular frame 4 (particularly, the lower edge of the R frame member 4a) and the face plate 6 (particularly, the lower plate) can be effectively prevented or suppressed. The problem of poor connection between them is advantageously eliminated or suppressed, and a brazed sandwich panel having a desired curved shape can be obtained.

The curved brazed sandwich panel according to the present invention obtained in this way has two ends in the bending direction, both ends of the R frame member 4a and the S frame member 4b in the illustrated example. The curved brazing sandwich panel is cut at the rectangular frame 4 portion and is used for various applications, although a crushing deformation occurs at the portion of the side wall portion 4bo on the outer side. However, such an end portion or an outer portion is cut off, and therefore, even if a crushing deformation occurs, there is no problem.

[0032]

EXAMPLES Examples of the present invention will be described below to clarify the present invention more specifically. However, the present invention is not limited by the description of such examples. Not that, of course. Also,
In the present invention, various changes, modifications, improvements, etc., based on the knowledge of those skilled in the art, in addition to the following embodiments, in addition to the above-described specific description, without departing from the spirit of the present invention. It should be understood that

Example 1 First, a cross-sectional shape made of aluminum alloy: 6063, having a rectangular outer shape of 40 mm in width and 95 mm in height, and each of the four wall portions having a thickness of 5 mm. The R frame member 4a formed of a hollow extruded member having a square shape was used as an extruded T1 material. As shown in FIG. 5A, one side wall (4b) is used as the S frame material 4b.
o) alone, as shown in Table 1 below, hollow extruded profiles having various thin thicknesses: t, and inner side wall portions (4b
As shown in Table 1 below, i) hollow extruded profiles each having a thin (t) wall portion were each extruded, and each was a T1 material.

Next, using two of the obtained R frame members 4a and two of the various S frame members 4b, the respective frame members are arranged in parallel with each other and joined in a rectangular form. And, respectively, 500mm × 350mm
After forming the various rectangular frames 4 having the rectangular shape described above, a plurality of honeycomb forming materials similar to the conventional one are set in parallel inside each of the rectangular frames 4, and a honeycomb core having a predetermined cell size is formed. While the (combination) 2 is incorporated, the rectangular frame 4 and the honeycomb core 2 are sandwiched from both upper and lower sides, and a brazing material (aluminum alloy: 4045) is clad on the inner surfaces. The upper and lower face plates 6 and 6 made of a single-sided aluminum brazing sheet (core material: aluminum alloy: 6951) having a thickness of 2.5 mm are laminated to produce a panel assembly as shown in FIG. did.

Further, after that, this panel assembly is
It is set between the upper and lower press jigs 10 and 12 as shown in FIG.
C. and subjected to a bending process under a load of 1000 kgf while performing brazing, thereby producing a curved panel having a curvature radius of 2620 mm on the outer surface side of the panel as shown in FIG. 1A.

With respect to the various curved panels thus obtained, the bending accuracy and the state of brazing of the R frame member 4a were examined, and the results are shown in Table 1 below.

[0037]

[Table 1] ：: good △: bad

As is clear from the results in Table 1, S
By making one of the side walls 4bo outside the frame member 4b or the side walls 4bo and 4bi on both sides thereof thin,
A good bending accuracy can be obtained, and an unbonded portion generated at the lower edge of the R frame member 4a disappears, so that a good brazing condition can be obtained on both the upper and lower surfaces.

However, when the thickness (t) of the side wall portion of the S frame member 4b approaches the thickness (T = 5 mm) of the side wall portion of the R frame member 4a, the decrease in the compressive strength of the S frame member 4b is reduced. for,
In the final stage of the bending, the brazing heating is completed while the S frame member 4b completes the edge of the R frame member 4a to be bent. In the case where the unbonded portion is partially generated at the lower edge of the lower surface and the thickness of the side walls 4bo and 4bi is extremely thin, for example, t = 0.5 mm, The desired frame material could not be obtained due to the inability to machine and difficult machining.

On the other hand, the S frame member 4b has the same size as the R frame member 4a, that is, the side wall portions 4bo and 4bi.
When a hollow extruded profile having a wall thickness of 5 mm is used, the deformation of the S frame member 4b is not sufficient,
It was recognized that the crushing deformation of the R frame member 4a mainly occurred, and therefore, the bending accuracy was poor, and that an unjoined portion was formed between the lower surface and the lower surface plate 6 at the end of the R frame member 4a.

Example 2 In Example 1, a hollow extruded member obtained by extrusion molding was used as the R frame member 4a, and one of the side walls (4b
o) or both side walls (4bo, 4bi) by machining to provide grooves 20 or through holes 22 as shown in FIG.
b was produced. The groove 20 has a depth of 2.5 m.
m and the width are 10 mm, and the through holes 22 are provided at intervals of 70 mm as circular holes having a diameter of 42.5 mm.

Then, using the S frame member 4b produced in this manner, the R frame member of Example 1 was combined with the R frame member into a rectangular shape, and joined and integrated. Then, the obtained rectangular frame member 4 was used. Then, in the same manner as in Example 1, a panel assembled body was produced, and further, brazing and bending were performed in a heating furnace to produce various types of curved surface panels.

When the bending accuracy and the brazing state of the R frame member 4a were examined for the various curved panels thus obtained, it was found that at least the outer side wall portion was used regardless of which S frame member 4b was used. By forming the grooves 20 and the through holes 22 provided in the 4bo, the compressive strength of the S frame member 4b that is not to be bent can be reduced without difficulty, and the bending accuracy and the brazing state of the R frame member 4a are as follows. Both the upper and lower surfaces were good, and the quality was significantly improved.

Example 3 Using aluminum alloy: 6N01, height: 95 m
After extruding a hollow extruded material having a rectangular external shape with a width of 40 mm and a four-sided wall thickness of 5 mm and a square cross-sectional shape of 40 mm, the temper was changed to T1. An R frame member 4a made of a material and an S frame member 4b made of an O material were manufactured.

Next, a rectangular panel 4 was manufactured using the obtained R frame member 4a and S frame member 4b, and a curved panel was manufactured in the same manner as in Example 1. For comparison, a target curved panel was manufactured in the same manner using 6N01-T1 material as the S frame material together with the R frame material.

With respect to the two curved panels thus obtained, the bending accuracy and the brazing state of the R frame member 4a were examined. The results are shown in Table 2 below. By using a T1 material as the S frame material 4b and manufacturing a curved panel using an O material having a different temper from the R frame material 4a, the compressive strength of the S frame material 4b is effectively reduced. Therefore, the bending can be smoothly progressed, and a curved panel having good bending accuracy can be easily obtained. Regarding the brazing condition of the R frame member 4a, both the R frame member 4a and the S frame member 4b do not have an edge on the lower surface of the R frame member 4a in the curved panel obtained as the T1 material. Although the joint was formed, the quality of the panel after the brazing and heating could be significantly improved by changing the temper of the S frame material 4b to the O material.

[0047]

[Table 2] ：: good △: bad

[0048]

As is apparent from the above description, according to the present invention, an S frame material which is not to be bent and which is to be provided as a rectangular frame in a curved brazing sandwich panel is to be bent. Since a frame material having a compressive strength lower than that of the R frame material is used, the brazing state of the lower surface of the rectangular frame generated during the production of such a sandwich panel can be effectively improved. hand,
As a result, it is possible to provide a curved panel which maintains a good brazed state.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a curved panel formed of a curved brazing honeycomb panel, wherein FIG. 1 (a) is a perspective explanatory view showing a cutaway of such a curved panel;
(B) is an explanatory perspective view showing only a rectangular frame taken out from such a curved panel.

FIG. 2 is a partially cutaway perspective view showing a flat panel assembly obtained by combining a honeycomb core, a rectangular frame, and a face plate.

FIG. 3 is an explanatory front view showing a state in which a flat panel assembly is arranged between upper and lower press jigs.

FIG. 4 is an explanatory view showing a deformed form of a frame material caused by bending of a rectangular frame body in a curved brazing sandwich panel.

FIG. 5 is an explanatory view showing a form of a hollow extruded shape used as an S frame material in the present invention, wherein (a) shows an example of an S frame material in which one side wall is thinned; (b) and (c) show examples of the S frame material having a groove and a through hole provided in one side wall, respectively.

[Explanation of symbols]

 2 Core 4 Rectangular frame 4a R frame 4b S frame 4bo Outer wall 4bi Inner wall 6 Face plate 10,12 Press jig 14,16 Pressing surface 18 Gap 20 Groove 22 Through hole

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) E04C 2/36 E04C 2/36 G 2/38 2/38 J F term (reference) 2E162 CB08 CB15 4F100 AB10B AB31B AT00A AT00C BA03 BA06 BA10A BA10C DB17B DB19A DB19B DB19C DC01B DC21B DC25B DD05B EC16 EC162 EH012 EH17 EJ172 EJ282 EJ422 GB07 GB31 JK05B

Claims (12)

[Claims] 1. A rectangular form in which two R frame members to be bent and two S frame members not to be bent are combined by arranging the respective frame members in parallel with each other. A predetermined core is arranged inside the rectangular frame using a rectangular frame obtained by performing a continuous joining, and the rectangular frame and the core are sandwiched between two face plates to form a solder on the face plates. In a curved sandwich panel formed by bending the entire panel in one direction by bending, the S frame member for providing the rectangular frame body has a lower compressive strength than the R frame member. Curved brazing sandwich panel characterized by the following. 2. The R frame member and the S frame member are each formed of a hollow extruded shape member having a B-shaped cross-sectional shape, and the rectangular frame member of the hollow extruded shape member providing the S frame material is provided. 2. The brazed sandwich panel according to claim 1, wherein the thickness of at least the outer side wall portion is smaller than the thickness of the side wall portion of the hollow extruded profile providing the R frame material. 3. The S-frame member is formed of a hollow extruded member having a B-shaped cross-sectional shape, and the hollow extruded member is provided on a side wall portion of the hollow extruded member at least outside the rectangular frame. 3. The brazed sandwich panel according to claim 1, wherein a groove extending in the longitudinal direction of the profile is formed. 4. The S-frame member is formed of a hollow extruded member having a B-shaped cross-sectional shape, and a plurality of through-holes are formed in a side wall portion of the hollow extruded member at least outside the rectangular frame. The brazed sandwich panel according to any one of claims 1 to 3, wherein the holes are provided at regular intervals in a longitudinal direction of the hollow extruded shape. 5. The R frame material and the S frame material are each made of a frame material made of aluminum or an alloy thereof, and the tempers of the frame materials are different. A brazed sandwich panel according to any of the preceding claims. 6. The brazed sandwich panel according to claim 5, wherein the R frame material is a T material, and the S frame material is an O material. 7. A method of manufacturing a brazed sandwich panel having a curved surface in which the entire panel is curved in one direction, comprising: two R frame members to be bent; and the R frame. A rectangle obtained by integrally joining two S-frame members, which are not to be bent, having a lower compressive strength than those of the respective members in a rectangular form in which the respective frame members are arranged in parallel with each other and combined. Using a frame, a predetermined core is arranged inside the rectangular frame, while the rectangular frame and the core are sandwiched between two face plates,
By applying heat between the upper and lower press jigs having a press surface corresponding to the intended curved shape, the rectangular frame, the core and the face plate are integrally brazed and joined together, A method for producing a curved brazed sandwich panel, characterized in that the panel is provided with a curved surface having a curved shape. 8. The R frame member and the S frame member are each formed of a hollow extruded shape member having a B-shaped cross-sectional shape, and the rectangular frame member of the hollow extruded shape member providing the S frame material is provided. 8. The method for manufacturing a brazed sandwich panel according to claim 7, wherein the thickness of at least the outer side wall portion is smaller than the thickness of the side wall portion of the hollow extruded profile providing the R frame material. . 9. The S-frame member is formed of a hollow extruded member having a B-shaped cross-sectional shape, and the hollow extruded member is formed on a side wall portion of the hollow extruded member at least outside the rectangular frame. 9. The method for manufacturing a brazed sandwich panel according to claim 7, wherein a groove extending in a longitudinal direction of the profile is formed. 10. The S-frame member is formed of a hollow extruded shape member having a B-shaped cross-sectional shape, and a plurality of through-holes are formed in a side wall portion of the hollow extruded shape material located at least outside the rectangular frame. The method for manufacturing a brazed sandwich panel according to any one of claims 7 to 9, wherein the holes are provided at regular intervals in a longitudinal direction of the hollow extruded profile. 11. The R frame member and the S frame member each include:
The method for manufacturing a brazed sandwich panel according to any one of claims 7 to 10, wherein the brazed sandwich panel is formed of a frame material made of aluminum or an alloy thereof, and the tempers of the frame materials are different. . 12. The S frame, wherein the R frame material is a T material.
The method for manufacturing a brazed sandwich panel according to claim 11, wherein the frame material is an O material.