JPH0790301B2 - Honeycomb structure pressing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a honeycomb structure pressing device for pressing a core having a brazing material arranged in a contact portion and a face plate in a honeycomb structure.

[0002]

2. Description of the Related Art Conventionally, a relatively soft metal, for example, a plate material made of aluminum or its alloy, or a metal foil such as aluminum foil or iron foil, paperboard, resin-impregnated paper, paper such as synthetic paper, polyethylene, polypropylene, etc. Laminating materials for laminating consisting of plastic sheets, and fixing the plates or materials to each other at fixed intervals with a fixing material such as a brazing material or an adhesive, and expanding the laminated body thus constructed in the thickness direction. There is known a honeycomb structure in which a honeycomb core is formed by this, and face plates are fixed to both edges of each material forming the laminated body, that is, the front and back surfaces of the honeycomb core with a fixing material.

An example of such a honeycomb structure is shown in the perspective view of FIG. The honeycomb structure 1 of the present example includes a core 2 and a face plate 3 that covers both surfaces of the core 2 and is fixed thereto.
The core 2 is formed by fixing and laminating ribbon-shaped aluminum alloys 2a at a predetermined interval and stretching in a direction perpendicular to the laminated surface to form a hexagonal cylinder assembly.

In order to manufacture the above-mentioned honeycomb structure 1, as shown in the partial cross-sectional view of FIG. 7, the face plate 3 is arranged on the front and back surfaces of the core 2 with the brazing material 4 as a fixing material, and pressure is applied. The brazing material 4 is placed on the base plate 5 of the tightening device and pressed from above by the flat plate-shaped pressing jig 6 of the pressing device, and during this pressing, the brazing material 4 is melted by heating from the surroundings, Then cool.
This heating is performed by putting the entire pressing device in a heating furnace, for example, and heating the entire pressing device including the core 2, the face plate 3, and the brazing material 4.

[0005]

However, when the honeycomb structure 1 is manufactured, the heat capacity of the base plate 5 and the pressing jig 6 of the pressing device is large, so that the following problems occur.

(1) A base plate 5 having a large heat capacity in the furnace
Since it is largely consumed by the pressurizing jig 6, the heating speed of the brazing material 4 becomes slow. For this reason, Si contained in the brazing material 4 disappears due to solid diffusion during heating, the brazing amount of the brazing material 4 becomes insufficient, and the diffused Si adheres to the core 2 and the face plate 3, and particularly, the heat treatment type aluminum. When an alloy is used for the core 2 and the face plate 3, that portion is eroded and a hole or the like is formed. As a result of these, defective joining of the brazed portion is caused.

(2) As described above, the rate at which the brazing material 4 is heated is slowed by the base plate 5 and the pressing jig 6 having a large heat capacity. There is a part where the heating rate is fast. Therefore, the wax in that part is held in the molten state for a long time,
The core 2 and the face plate 3 are eroded by the brazing, and holes are formed in the brazing portion. As a result, as in the case of (1), defective joining of the brazed portion is caused. Further, if the heating and cooling rates of the core 2 are different, the core 2 is deformed, such as distorted or warped.

(3) When a heat treatment type aluminum alloy is used for the core 2 and the face plate 3, a faster cooling rate has higher strength and less brazing defects, so that a high performance honeycomb structure 1 can be obtained, which is preferable. However, if the heat capacity of the base plate 5 or the pressure jig 6 is large, the cooling rate becomes slow, and not only the predetermined heat treatment effect cannot be obtained but also the productivity is impaired.

(4) When the heating speed of the brazing filler metal 4 becomes slow, a long heating process is required, and when a heat-treatable aluminum alloy is used for the core 2, thermal expansion of the core 2 causes thermal expansion, as shown in FIG. The core 2 may be deformed as shown,
A highly accurate honeycomb structure 1 cannot be obtained.

In order to solve the above problems, the base plate 5 and the pressing jig 6 are thinned in order to increase the heating speed of the brazing material and the cooling speed of the core 2 and the face plate 3.
Even if an attempt is made to reduce the weight, the base plate 5 and the pressure jig 6 are heated to 600 ° C. in the brazing process and then cooled to room temperature, so that the thickness and weight are such that thermal deformation does not occur. It is necessary and cannot be realized. Further, a base plate 5 or a pressing jig 6 having a lattice shape as shown in FIG. 9 is also used. Although the core 2 and the brazing material 4 are heated at a high speed and the core 2 and the face plate 3 are cooled at a high speed, the above-mentioned lattice-shaped base plate 5 and pressure jig 6 can solve the above problems. It was not possible to obtain the heating rate of the core 2 and the brazing material 4 and the cooling rate of the core 2 and the face plate 3.

In view of the above, the present invention aims to solve the above problems by increasing the rate of heating the core 2 and the brazing material 4 and the rate of cooling the core 2 and the face plate 3 to make the temperature distribution uniform. An object of the present invention is to provide a pressing device for a honeycomb structure, which enables good brazing, high productivity, and high performance of the honeycomb structure 1.

[0012]

In order to solve such an object, the present invention has the following constitution as a means for solving the problem. That is, in the clamping device of Ruha honeycomb structural body from the base plate and the pressing jig, and a base plate and a pressing jig of the clamping device together with each in a lattice shape, forming a lattice The side wall of the honeycomb structure is provided with a ventilation hole, and the ventilation hole communicates the outside with the inside of each compartment.

[0013]

The base plate of the pressing device and the pressing jig place the brazing filler metal in the contact portion, and press and clamp the core and face plate arranged in the honeycomb structure. A pressing device including a core, a face plate and a brazing material is put into a heating furnace and heated. At that time, heat also enters inside each compartment from the vent holes on the base plate and the side wall of the pressing jig,
The heating speed of the entire clamping device is increased. The heating melts the brazing material, and then the pressing is stopped or cooled in the pressed state, whereby the brazing material is solidified at the contact portion and the core and the face plate are fixed. At that time, cold air also enters the internal compartments through the vent holes in the base plate and the side walls of the pressing jig, and the cooling speed of the entire clamping device is increased.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a first embodiment of the present invention. The base plate 5 of the pressing device of the first embodiment is provided in a grid pattern. That is, the four sides in the vertical and horizontal directions form a lattice shape constituted by the side walls 8. Therefore, a rectangular parallelepiped space (hereinafter referred to as partition 9) surrounded by the side wall 8 is formed. The side wall 8 of each compartment 9 has ventilation holes 11 on each side.
Is provided. The ventilation hole 11 is formed by forming a round hole in the side wall 8. Therefore, not only the upper and lower openings of each compartment 9, but also the inside of each compartment 9 of the base plate 5 communicates with the outside of the base plate 5 not only by the vent holes 11. Further, the pressure jig 6 of the first embodiment is also configured in exactly the same shape as the base plate 5. The base plate 5 and the pressurizing jig 6 are made of a metal that has a high heating rate and a high cooling rate and is less likely to be thermally deformed even when placed in a heating furnace. In the first embodiment, those made of stainless steel are used. ing.

The operation of the clamping device composed of the base plate 5 and the pressing jig 6 configured as described above will be described. Figure 2
As shown in FIG. 2, two heat-treatable aluminum alloy face plates 3 each having a brazing material 4 clad on the surface, and a heat-treatable aluminum alloy core 2 between the face plates 3 are arranged in a honeycomb shape, and It is placed on the base plate 5. Further, the pressing jig 6 of the pressing device is arranged on the arranged cores 2 and face plate 3. In this state, by pressing the pressing jig 6 toward the base plate 5, the core 2 and the face plate 3 are
It is clamped by the base plate 5 and the pressure jig 6. Compacted core 2,
A pressing device including the face plate 3 is placed in a heating furnace and heated in a vacuum atmosphere or a zero atmosphere such as nitrogen gas. The heat of the furnace is transmitted to the base plate 5 and the pressing jig 6 by radiation or gas convection. At that time, the radiant heat is transmitted from the vertical direction of the base plate 5 and the pressing jig 6 to the inside of each compartment 9 through the opening, and also in the lateral direction of the side wall 8 of the base plate 5 and the pressing jig 6. It is transmitted to the inside by the vent hole 11 communicating with the outside. Further, since a plurality of vent holes (openings and vent holes 11) are provided in each compartment 9 for high-temperature gas, it is easy for the gas to flow into the interior and heat is easily transferred to the interior. The heat transmitted to the base plate 5 and the pressing jig 6 melts the brazing material 4. After the brazing material 4 is melted, the pressing of the pressing device is stopped, or the brazing material 4 is cooled in the pressed state. For cooling, for example, forced cold air is blown onto the pressure jig 6 from above as indicated by an arrow A in FIG. At this time, the blown cold air flows into the pressure jig 6 through the upper opening, and uniformly flows from the ventilation hole 11 in four directions as indicated by arrows B, C, D, and E. In the case of the base plate 5, by blowing cold air from below, uniform and rapid cooling is possible as in the case of the pressing jig 6.

As described above, in the first embodiment, since the vent holes 11 are provided in the side walls 8 of the base plate 5 and the pressing jig 6, it is possible to quickly supply heat to the inside. Therefore, the heating rates of the base plate 5 and the pressing jig 6 can be increased, and the brazing material 4 can be quickly and uniformly melted. As a result, the diffusion of Si from the brazing material 4 and the holding of the molten brazing material for a long time are almost eliminated, and the bonding strength of the brazed portion can be improved. Further, the core 2 can be prevented from being deformed, and the highly accurate honeycomb structure 1 can be obtained. Further, since the cooling rates of the base plate 5 and the pressing jig 6 are uniform and fast, the honeycomb structure 1 has high strength and high productivity.

Next, FIG. 4 shows a second embodiment of the present invention. The present embodiment is different from the first embodiment in that the size of the vent hole 11 is the largest in the central portion of the base plate 5 and the pressure jig 6 and becomes smaller toward the outside.

As described above, in this embodiment, since the size of the vent hole 11 is changed, the heat capacity is small in the central portion and large in the outer portion. Therefore, at the time of heating, the temperature is usually high outside and slow in the center, but in the present embodiment, the temperature increase in the center can be promoted due to the difference in heat capacity, and the temperature increase in the outside can be suppressed. It can be more uniform. Also, during cooling, the cooling rates at the central portion and the outside can be made more uniform due to the difference in heat capacity. Furthermore, since heat and cold air circulate well in the large central portion of the vent hole 11, the temperature rising rate and the cooling rate in the central portion and the outside can be made more uniform as compared with the first embodiment, and defective joining of the brazed portion can be achieved. Also, the deformation of the honeycomb structure 1 can be prevented.

Next, FIG. 5 shows a third embodiment of the present invention. In this embodiment, the structure of the pressure jig 6 of the pressing device is different from that of the first embodiment, and the base plate 5 is the same as that of the first embodiment. That is, the pressure jig 6 of this embodiment has a lattice shape and the side walls 8 have ventilation holes 11 of the same size.
However, unlike the first embodiment, the central portion 12 of the pressing jig 6 has a curved concave shape.

As described above, in this embodiment, since the central portion 12 of the pressing jig 6 is recessed, the heat capacity of the central portion 12 is small and the heat capacity of the outside is large. Therefore, the temperature rising rate and the cooling rate of the central portion 12 and the outside can be made more uniform, and it is possible to prevent defective joining of the brazing portion and deformation of the honeycomb structure 1.

In each of the embodiments of the present invention, the above effects can be obtained, and Table 1 shows a comparison between the results obtained by using the conventional lattice base plate 5 and the pressing jig 6 shown in FIG. It was

[0022]

[Table 1]

(Comparison Conditions) Dimensions of Honeycomb Panel
30H × 900W × 1200L Brazing method Dimensions of vacuum brazing base plate and pressure jig 70H × 920W × 1250
L The present invention can be variously modified without departing from the gist of the invention, and the vent hole 11 may have a shape other than a round shape, for example, a polygonal shape such as a rectangle or a triangle.
Further, since the upper portion of the base plate 5 and the lower portion of the pressure jig 6 are blocked by the face plate 3 during the work, the upper portion of the base plate 5 and the lower portion of the pressure jig 6 may be pre-filled. Good.

[0024]

As described in detail above, in the pressing device for a honeycomb structure of the present invention, the base plate and the pressing jig are formed in a lattice shape, and the side walls thereof are provided with ventilation holes that communicate the outside with the inside of each compartment. Since it is provided, the heating and cooling rates of the base plate and the pressing jig can be increased, and the temperature distribution can be made more uniform. Therefore, the rate of heating the core and the brazing material, the rate of cooling the core and the face plate are fast and can be uniformly heated and cooled, so that the bonding strength of the brazing portion and the accuracy of the honeycomb structure can be improved, and The productivity of the honeycomb structure can also be increased.

[Brief description of drawings]

FIG. 1 is a perspective view of a base plate showing a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing a state of being clamped by the clamping device of the first embodiment.

FIG. 3 is an explanatory view showing a flow state of cold air in the pressure jig of the first embodiment.

FIG. 4 is a perspective view of a base plate showing a second embodiment of the present invention.

FIG. 5 is a perspective view of a pressure jig showing a third embodiment of the present invention.

FIG. 6 is a perspective view showing the structure of a honeycomb panel.

FIG. 7 is a partial cross-sectional view showing a state of being clamped by a conventional clamping device.

FIG. 8 is an explanatory diagram showing one conventional problem.

FIG. 9 is a perspective view showing a conventional grid-shaped base plate.

[Explanation of symbols]

1 ... Honeycomb structure (honeycomb panel), 2 ... Core, 3
... face plate, 4 ... brazing material, 5 ... base plate, 6 ... pressing jig, 8 ... side wall, 9 ... partition, 11 ... vent hole

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B23K 101: 02

Claims (1)

[Claims] In clamping device Ruha honeycomb structural body and a 1. A base plate and pressing jig, while the respective lattice shape and the base plate and the pressing jig of the clamping device, its A honeycomb structure pressing device characterized in that a ventilation hole is provided in a side wall forming a lattice, and the ventilation hole communicates the outside with each compartment.