JPS62273840A - Manufacture of honeycomb structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method for manufacturing a honeycomb structure, and more specifically, a honeycomb structure in which a face plate is brazed to a honeycomb core through a brazing material. The present invention relates to a method for manufacturing a structure.

[Prior Art] Conventionally, laminating materials made of relatively soft metals, such as plate materials made of aluminum or its alloys, or metal foils such as aluminum foil or iron foil, are laminated at regular intervals using brazing filler metals or adhesives. A honeycomb core is formed by fixing the plates or materials to each other at the positions where they are placed and stretching the thus constructed laminate in the thickness direction. A honeycomb structure is known in which face plates are fixed to the front and back surfaces.

An example of such a honeycomb structure is shown in the perspective view of FIG. 7(A). The honeycomb structure 1 of this example includes a core 2 and a core 2.
It consists of a face plate 3 which covers both sides of and is fixed to. core 2
In this example, ribbon-shaped aluminum alloy plates 28 are fixedly laminated at predetermined intervals and stretched in a direction perpendicular to the laminated surface to form a hexagonal tube assembly.

As illustrated in the partial front view of FIG. 7(b), the method for manufacturing the honeycomb structure 1 is as follows: ] With the face plate 3 disposed on the front and back surfaces of the core with the brazing material 4 interposed therebetween, the base plate of the pressing device is 5, and is pressed from above with a flat pressing jig 6 of a pressing device, and during this pressing, the brazing filler metal 4 is melted by heating from the surroundings, and then cooled. , done. Note that this heating step is performed by placing the entire pressing device in a heating furnace, for example, and the core 21 face plate 3. It is configured to heat the entire clamping device including the brazing material 4.

[Problems to be Solved by the Invention] However, in the method for manufacturing the honeycomb structure 1 described above, the following problems occur because the heat capacity of the base plate 5 and the pressing jig 6 of the pressing device is large.

(1) The furnace has a large heat capacity base plate 5 and pressure jig 6
Since a large amount of heat is consumed, the rate at which the brazing filler metal 4 is heated becomes slow. For this reason, 3i contained in the brazing filler metal 4 disappears due to solid diffusion during heating, resulting in an insufficient amount of solder in the brazing filler metal 4, and the diffused Si adheres to the core 2 and face plate 3. Metal material core 2 face plate 3
If used for this purpose, it will corrode the area and cause holes etc.

These results lead to poor bonding of the brazed portions.

(2) As described above, the heating rate of the brazing filler metal 4 is slow, but there are localized areas where the heating rate is fast, for example, in areas close to a heat source or the like.

For this reason, the solder in that part is held in a molten state for a long time, so that the solder corrodes the core and the face material 3, and the brazing causes holes or the like in the part. As a result, similar to (1), poor joining of the brazed portion occurs.

(3) Due to the above-mentioned (1) and (2>), it is not possible to reduce the thickness of the core 2, and there are restrictions on the additive components that can be added to improve the strength of the core 2 and face plate 3. However, it is not possible to create a honeycomb structure with a thin and strong core.

(4) As mentioned above, if the rate of heating the brazing filler metal 4 is slow, a long heating process will be required, and especially when a metal material such as aluminum is used for the core 2, due to thermal expansion of the core 2. , the core 2 is deformed as shown in FIG. 8, and a highly accurate honeycomb structure cannot be obtained.

Therefore, an object of the present invention is to provide a method for manufacturing a honeycomb structure that solves the above problems.

[Means for solving the problem] The present invention, which has been made to achieve the above object, consists of a honeycomb structure in which the core and the face plate are bonded together with a brazing material placed in the contact area between the core and the face plate. The cores and face plates are arranged in a structure, and then the arranged cores and face plates are pressed by a pressing device while the brazing filler metal is melted by heating, and then the pressing is stopped or the solder metal is cooled while being pressed. According to the method for manufacturing a honeycomb structure, in which the brazing material is solidified at the contact portion to fix the core and the face plate, the heating is performed by at least a heat generating part provided in a pressing device. The gist of this paper is the structure of a method for manufacturing a honeycomb structure.

Here, the state in which the brazing material is disposed at the contact portion between the core and the face plate may be, for example, a state in which the core is in contact with a plating sheet in which the brazing material has been integrated with the surface of the face plate in advance. .

The pressing device is for pressing the arranged cores and face plates, and is composed of, for example, a base plate on which the cores and face plates are placed, and a pressing jig for pressurizing them. Note that there are various types of pressure jig, such as one that tightens with bolts and nuts, one that presses using a spring, one that carries a flat weight, and one that presses using a press.

The heating during compaction is performed by at least a heat generating part provided in the compacting device. For example, the entire compacting device is placed in a heating furnace and the heat generating portion provided in the compacting device is heated together with the surrounding heat. Alternatively, the heating may be performed only by heating a heat generating part provided in the clamping device. Note that the above-mentioned heat generating part may be built into the clamping device, for example, or may be installed near the clamping device.
: A heater, a high-frequency heater, or a heater that allows combustion gas to flow through piping.

[Function] In the method for manufacturing a honeycomb structure of the present invention configured as described above, the heating step during compaction is performed by heating at least the heat generating part installed in the compaction device, so that it is different from the conventional method. The clamping device hardly takes away the amount of heat from the surroundings, and the amount of heat applied to the brazing material increases. Therefore, the heating rate of the brazing filler metal is increased, and the heating process is shortened. Furthermore, since the temperature of the compaction device increases uniformly, the heating rate is constant in all parts of the brazing material.

Next, the present invention will be explained in detail. The present invention is not limited to the following examples, and includes various embodiments without departing from the gist.

[Example] Embodiments of the present invention will be described below based on the drawings.

FIG. 1(a) is a schematic diagram showing the pressing and heating process of the manufacturing method of the first embodiment, and FIG. 1(b) is an explanatory diagram showing the buried state of the heater 17.

In the same figure, reference numeral 11 denotes a bottom plate made of an aluminum plate (BAllPC) with a thickness of 1.2 mm, and a core 12 is disposed on this bottom plate 11. A top plate 13 made of the same material is provided.

The core 12 is made of an aluminum plate (B
A21PC>, cell size 1/2 inch height 2
It has already been formed on a 7mm honeycomb core.

Further, each face plate 11, 13 is coated with a brazing filler metal 14 on the core 12 side at a cladding ratio of 10%.

Note that the entire panel has a size of 150 mm x 900 mm.

In this arrangement, a honeycomb panel (hereinafter referred to as a honeycomb panel) was arranged between the base plate 15 and the pressing jig 16 of the pressing device.

The base plate 15 is larger than the size of the panel,
A heater 17 made of an electric resistor is buried inside the heater 17 at a uniform depth from the upper surface thereof, as shown in FIG. 1(b), to uniformly heat the upper surface of the base plate.

Further, the pressing jig 16 is a weight on a flat plate, and its size is larger than the above-mentioned panel.

The pressing device and honeycomb panel constructed as described above were pressed and heated in a nitrogen gas atmosphere to perform a brazing process. The pressure of the base plate 15 and the pressure jig 16 is 0.1 kCI/ri
Then, the ambient temperature was raised to 600℃, and at 600℃
Pressing was continued for 0 minutes. Note that during this heating process, heater 1
A 220V AC power source 18 is connected to 7, and approximately 4200W of heat is applied to the base plate 15. After that, after cooling to 80℃,
I took out the honeycomb panel.

The configuration of the method for manufacturing a honeycomb structure according to the first embodiment has been described in detail above, but in this embodiment, in addition to heating from the surroundings, the heater 17 separately heats the base plate 15 itself. As a result, the temperature of the base plate 15 is increased. For this reason, the base plate 15 hardly takes away the heat of the atmosphere,
To quickly and uniformly melt a brazing filler metal 14. As a result, the diffusion of 3i from the solder and the retention of the molten solder for a long time are almost eliminated, and (1
) It is possible to improve the joint strength of the brazed portion, and (2) it is possible to make the honeycomb panel thinner and to improve its strength, and accordingly, it is possible to increase the size of the honeycomb panel. Furthermore, (3)
Since the heating process can be shortened, the honeycomb panel will not be deformed and a highly accurate honeycomb panel can be obtained. Furthermore, as a secondary effect, (4) the amount of heat generated by the heater 17 is also transmitted to the brazing material 14, making it possible to lower the ambient temperature than before, resulting in energy savings.

Next, a second embodiment of the present invention will be described. FIG. 2 is a schematic diagram showing the pressing step of the manufacturing method of the second embodiment.

This embodiment differs from the first embodiment in that a press 21 is mounted instead of the pressing jig 16 made of a flat plate. A heater 22 is embedded in the press 21 so as to uniformly heat the surface in the same way as the base plate 15, and is connected to a 220V AC power supply 23 to apply approximately 5600W of heat to the press 21.
Add to 1.

The configuration of the method for manufacturing a honeycomb structure according to the second embodiment has been described above, but in this embodiment, compared to the first embodiment, the heater 22 is further configured to heat the press 21, and the present embodiment is more The brazing filler metal 14 can be melted more quickly and uniformly. This produces the same effects as the first embodiment.

Next, a third embodiment of the present invention will be described. FIG. 3 is a schematic diagram showing the pressing step of the manufacturing method of the third embodiment.

This embodiment differs from the second embodiment in that the honeycomb panel is larger, and therefore the base plate 31 and press 32 have a size of 2000 mm x 1500 mm.

The surfaces of such large base plate 31 and press 32 are not flat. For this purpose, the surface is appropriately roughened, and a load that is nearly equally distributed through the roughness is applied to the honeycomb panel via flat plates 33 and 34. In addition, the base plate 31. As in the second embodiment, heaters 35 and 36 are embedded in each of the presses 32, and each is connected to an AC power source 37 and 38.

The method for manufacturing the honeycomb structure of the third embodiment configured as described above is similar to the second embodiment, in which the brazing filler metal 14 is quickly and
Moreover, it can be melted uniformly, and the same effects as in the second embodiment can be achieved. Furthermore, this embodiment has the advantage that it is possible to cope with an increase in the size of the honeycomb panel.

Next, a fourth embodiment of the present invention will be described. FIG. 4 is a schematic diagram showing the pressing process of the fourth embodiment.

A honeycomb panel 51 similar to that of the third embodiment is placed between flat plates 52 and 53, a panel heater 54 is placed above the flat plate 52, and a panel heater 55 is placed below the flat plate 53. It is configured to do so. Then, the structure configured as described above is placed on the base plate 56, and the pressurizing jig 57
Tighten from the top. Note that during this pressing process, the panel heaters 54 and 55 are heated, and the honeycomb panel 51
The brazing filler metal 58 is uniformly melted. After that, it is cooled and the honeycomb panel 51 is taken out.

The method for manufacturing a honeycomb structure according to the fourth embodiment configured as described above can quickly and uniformly melt the brazing filler metal 58 similarly to the previously described embodiments. In this embodiment, unlike the first to third embodiments, the brazing material 58 is heated only by the panel heaters 54 and 55 without heating the surrounding temperature, so the honeycomb panel 51 can be heated with a simple structure. can be manufactured.

Next, a fifth embodiment of the present invention will be described. FIG. 5 is a schematic diagram showing the pressing process of the fifth embodiment.

This embodiment differs from the fourth embodiment in that the flat plate 52.5
3 and the panel heaters 54 and 55, respectively.
．． 62 was established. Slats 61.62 are the 6th
It is a ceramic plate with a small heat capacity and high rigidity, shaped as shown in the figure. The fifth embodiment configured in this manner has the same effects as the fourth embodiment, and can manufacture a honeycomb panel with even higher precision.

Next, the test results of the second example described above will be presented. The results are shown in Table 1 below, in which the comparative example excludes heaters 17 and 22 corresponding to the prior art.

As is clear from the above results, according to this example,
The pre-brazing speed increases at 20° C./min in almost all parts up to 600° C., and the wax melts more quickly and uniformly than in the comparative example. For this reason, the solder joints are well bonded and the honeycomb panel is not deformed.

In addition, 1. Third. 4th. Similar test results were obtained for the fifth example.

In the embodiments described above, a plating sheet with a brazing material integrated onto the surface thereof is used as the face plate, and the plating sheet and the core are brazed, but there is no space between the core and the face plate. Brazing may be performed by placing a brazing filler metal.

As described in detail above, in the method for manufacturing a honeycomb structure of the present invention, the heating step during pressing is performed by heating at least a heat generating part provided in the pressing device. Therefore, (1) it is possible to improve the bonding strength of the brazing part, and (2)
This makes it possible to reduce the thickness of the honeycomb panel and improve its strength, which also makes it possible to increase the size of the honeycomb panel. (3) Prevents deformation of the honeycomb structure and provides a highly accurate honeycomb structure. (4) The amount of heating can be saved.

[Brief explanation of the drawing]

FIG. 1 (A) is a schematic diagram showing the pressing and heating process of the first embodiment of the present invention, FIG. 1 (B) is an explanatory diagram that also does not show the buried state of the heater, and FIG. FIG. 3 is an explanatory diagram showing the pressing and heating process of the third embodiment. FIG. 4 is an explanatory diagram showing the pressing and heating process of the fourth embodiment. FIG. 8 is an explanatory diagram showing the pressing and heating process of the fifth product, and FIG. 8 is an explanatory diagram showing one problem in the conventional method. 11...Bottom plate 12...Core 13...Top plate 51...Honeycomb panel 14.58...Brazing material 15.31.56...Bed plate 16.57...Pressure treatment Tool 21.32... Pressure jig (press) 17.22, 35.36... Heater 54.55... Panel heater

Claims (1)

[Claims] 1. With the brazing material placed in the contact area between the core and the face plate, the core and the face plate are arranged in a honeycomb structure, and then the arranged core and face plate are pressed by a pressing device. The brazing filler metal is melted by heating while being pressed, and then the brazing filler metal is solidified at the contact portion by stopping the pressing or cooling while still in the pressed state, thereby fixing the core and the face plate. A method for manufacturing a honeycomb structure, wherein the heating is performed by at least a heat generating part provided in a pressing device. 2. The method for manufacturing a honeycomb structure according to claim 1, wherein the heat generating section is a heater provided inside a clamping device. 3. The method according to claim 1, wherein the pressing device includes a pressing jig and a base plate, and the heat generating part is a heater provided inside the pressing jig and/or the base plate. A method for manufacturing a honeycomb structure.