JPS63165095A - Production of laminated structural body - Google Patents

Abstract

PURPOSE:To permit satisfactory joining by brazing without allowing an exces brazing filler metal to fill the recesses of sheets to be joined by placing a laminate material in a high-temp. reduced pressure atmosphere, melting the brazing filler metal and placing the laminated material in an atm. pressure atmosphere while cooling the material down to a prescribed temp. CONSTITUTION:The recesses 2 are formed to the sheets 1 made of an aluminum alloy to be joined. The recesses 2 communicate with the outside through a very small aperture 1a. The laminated material 4 formed by laminating the sheets 1 and the aluminum brazing filler metal 3 is placed in the high temp. reduced pressure atmosphere so that the brazing filler metal 3 is melted. Since the outside is under the pressure lower than the hermetic space including the recesses 2, the excess brazing filer metal 3 is drawn out together with the remaining air in the hermetic space to the outside of the material 4. The material 4 is thereafter cooled down to the temp. between liquidus line and solidus line of the metal 3 or below and is then exposed to the atm. atmosphere, by which the back flow of the metal 3 is prevented and the satisfactory brazing is executed.

Description

Detailed Description of the Invention (Field of Industrial Application) This invention relates to the production of a structure by stacking two or more structural thin plates mainly made of aluminum members and joining them by brazing with an aluminum brazing filler metal. It is about the method.

(Prior Art) Generally, laminated structures used for heat exchangers, semiconductor device coolers, sound absorbers, etc. are thin plates (for example, 0°2 to 2.0 mm thick) mainly made of aluminum members. They are joined together using adhesives, soldering, hard brazing, or other means.

By the way, among these joining methods, hard brazing is superior in terms of manufacturing efficiency and joint strength, and in this hard brazing, there is a
An aluminum brazing material made of aluminum solder alone or a composite material of aluminum solder and reinforcing material is interposed, and this laminated material is heated to melt the aluminum brazing material and join by brazing. In addition, in this hard brazing, there are cases in which the brazing material is required to act as a reinforcing material to increase the strength of the joined structures, or in which more brazing material is used than necessary in order to ensure a reliable joint. be.

(Problems to be Solved by the Invention) However, if more brazing filler metal than necessary is used during brazing joining, a recess will be present on the joint surface, and thin plates with openings in the side walls will be joined. In such cases, excess brazing material flows into the recesses and openings, accumulates, solidifies, and fills the recesses, impairing the function of the laminated structure such as forming precision passages through the recesses. Furthermore, there is a problem in that the purpose of use as a structure is also hindered.

The basic purpose of this invention is to solve the above-mentioned problems, and it is possible to successfully braze and join thin plates to each other without filling the recesses of the thin plates to be bonded. A method for manufacturing a pear-shaped structure is provided.

(Means for Solving the Problems) That is, the method for manufacturing a laminated structure of the present invention involves brazing and joining laminated materials in which an aluminum brazing material is interposed between thin structural plates mainly made of aluminum members. In a method for manufacturing a laminated structure, a recess provided on the joint surface side of the thin plate is surrounded and sealed by an aluminum brazing filler metal located at the edge of the thin plate, and the laminated material is placed in a high-temperature reduced pressure atmosphere. It is characterized by placing the Vt layer material under a normal pressure atmosphere to melt the brazing material, then cooling the laminated material to a temperature below the intermediate temperature between the liquidus temperature and the solidus temperature of the brazing material. That is.

Moreover, the four parts can be communicated with the outside of the laminated material through through holes provided in the side walls of the thin plates.

Note that the thin plates to be joined may be those made mainly of aluminum members, the remainder may be made of other metals or non-metals, and the thin plates may not be made entirely of aluminum. The point is that at least the portion to be joined with the aluminum brazing filler metal, which will be described later, is made of an aluminum member. Further, the material of the aluminum member may be pure aluminum or an aluminum alloy, and materials selected according to the intended use of the structure are used.

In addition, the aluminum brazing material used for joining thin plates is an aluminum alloy containing aluminum as its main component and silicon, etc. 0For example, JIS^4004. A4045 and A4003, ^
4047. A4105 or the like is used, and it is also possible to use a composite material in which this aluminum alloy and other metals are laminated as auxiliary materials. This aluminum brazing material can be large enough to cover the entire surface of the thin plates to be joined, or can be shaped so as to cut out a portion of the thin plates that will be in contact with a recessed portion, which will be described later. Further, depending on the shape of the recess, the shape of the joint surface, etc., the brazing material may be arranged only on the peripheral edge of the thin plate.

A recess is formed in the joint surface of the thin plates joined in this way to form a precision passage, and further, if desired, an opening is formed in the side wall of the thin plate to communicate the recess with the outside. ing. The shape of this recess or opening,
The position and the like are not limited to a specific one, but are formed according to the purpose of use of the vI structure to be manufactured.

For example, the recess may not only have a bottom, but also a part with a through hole penetrating the other side, or the entire recess may have a through hole, and at least the recess can be sealed with a brazing material. It is fine as long as it is something.

Furthermore, the atmosphere for joining the laminated materials is selected to be high temperature and reduced pressure, such as W! This is done by placing the eyebrow material in a vacuum furnace. The ambient temperature is selected to be equal to or higher than the melting point of the aluminum solder, and further lower than the melting point of the thin plate.

In addition, it is desirable that the reduced pressure state be a sufficient vacuum state of 10' Torr or more. This is because the vacuum state creates a non-oxidizing atmosphere, which allows for good brazing, and also prevents excess solder from entering the recesses of the thin plate. This is because retention of materials can be effectively prevented.

(Function) According to the present invention, the four parts provided on the bonding surfaces of the structural thin plates are surrounded and sealed by the aluminum brazing filler metal provided at the edges of the thin plates, and this laminated material is heated to a high temperature. By placing it under reduced pressure, the brazing filler metal melts and becomes flowable. Furthermore, compared to the reduced pressure atmosphere outside the laminate, the inside of the sealed recess is under normal pressure and relatively high pressure, and the brazing filler metal is subjected to a force that pulls it out of the laminate, causing excess It is possible to prevent the wax material from accumulating in the recesses and openings of the thin plate and filling the recesses and openings. Therefore, the laminate is placed in a hot atmosphere for a sufficient period of time to melt the brazing material and drain the excess to the outside. However, if the temperature is higher than necessary, the production efficiency will be reduced, so it is desirable to keep the temperature in the high temperature atmosphere for the minimum necessary time (for example, about 10 minutes).

In addition, the laminated material containing the melted brazing material was cooled to a temperature below the intermediate temperature between the liquidus temperature and the solid a temperature of the brazing material, and then placed in a normal pressure atmosphere from a reduced pressure atmosphere, so that the MR
Backflow from the outside of the material to the recess side is prevented. In other words, by placing the laminated material from a reduced pressure atmosphere to a normal pressure atmosphere, the outside of the laminated material becomes under relatively high pressure compared to the inside of the sealed recess, and the brazing material receives a tensile force inside. act. However, the fluidity of the brazing filler metal is sufficiently reduced, and backflow is prevented.

Cooling the laminated material below the above-mentioned intermediate temperature increases the solid phase component of the brazing filler metal and reduces its fluidity so that the backflow of the filler metal does not occur when the reduced pressure is released. It's a lick. Also, if the cooling temperature is lowered, more time is required for cooling, so this cooling temperature is
From the viewpoint of production efficiency, it is desirable to maintain the temperature at or just below the intermediate temperature and then release the reduced pressure state.

Note that the liquidus temperature and the solidus temperature are not fixed values, but depend on the material of the selected brazing filler metal.

In addition, if the structure requires an opening, after brazing, Wt
By providing openings at necessary locations in the R material, M-tight passages are ensured. This opening can be provided by making a portion of the thin plate that is to become the opening protrude in advance, and then cutting out the protruding portion after the thin plates are joined.

Further, by communicating the recessed portion of the thin plate to the outside of the laminated material through a through hole provided in the side wall of the thin plate, the inside of the recessed portion can be efficiently evacuated, and manufacturing efficiency is improved.

(Example) An example of the present invention will be described below based on FIGS. 1 to 3.

Thin plate 1 made of aluminum alloy such as JIS A3052
Four parts 2 consisting of continuous vertical and horizontal grooves are formed inside the plane, and on the side wall of the plane periphery, there are minute exhaust holes 1a (for example, 0.1~ 1. OM depth (round hole is also acceptable) is formed. A plurality of thin plates 1 are arranged so that the sinuous recesses 2 face in the same direction, and a thin plate-shaped aluminum brazing material 3 is interposed between them. The aluminum brazing filler metal 3 is a JIS A4004 alloy consisting of 10% by weight of Si, 5% by weight of H (J), and the remainder substantially A1.

This alloy has a liquidus temperature of 598°C and a solidus temperature of 55°C.
It consists of 4℃.

In the laminated material 4 in which the thin plate 1 and the aluminum brazing material 3 are laminated in this way, the recess 2 described above is surrounded and sealed by the brazing material 3 located at the edge of the thin plate 1 (exhaust hole 1
a is minute and is in a substantially sealed state), this laminated material 4 is heated to 600°C in a vacuum furnace (not shown), the pressure inside the furnace is reduced to 10'Torr, and the temperature is kept at a constant temperature for 10 minutes. to melt the brazing filler metal 3. In this state, the brazing filler metal 3 is melted and has sufficient fluidity, and the outside is under low pressure compared to the closed space including the four parts 2, so the brazing filler metal 3 has a force that draws it from the inside to the outside. acts. Therefore, the brazing material 3 near the recess 2 does not remain in the recess 2, and the excess brazing material 3 is drawn out from the edge of the sealed portion of the recess 2 to the outside of the laminated material 4. At this time,
Gas such as air remaining in the sealed portion is exhausted to the outside through the exhaust hole 1a to the extent that it does not interfere with drawing out the brazing filler metal 3.

Therefore, by determining the size of the exhaust hole 1a in accordance with the external pressure in the reduced pressure state, the residual gas inside can be efficiently exhausted without hindering the drawing out action of the excess brazing material. Next, this laminated material 4 is heated to the liquidus temperature (598°C) and solidus temperature (554°C) of the brazing material 3.
The brazing material 3 is cooled to 570°C, which is just below the intermediate temperature between
When the solid phase component of is increased and the fluidity is sufficiently reduced, the pressure is transferred from the reduced pressure state to the normal pressure state. In this state, the pressure on the sealed inside side is lower than that on the outside, so a force that draws the brazing filler metal 3 from the outside to the inside acts on the brazing filler metal 3.

However, since the fluidity of the brazing filler metal 3 has decreased as described above, backflow (inward movement) of the brazing filler metal 3 is prevented, and the brazing filler metal 3 solidifies and the thin plates 1 are bonded well. . Moreover, the precise shape of the four parts 2 provided on the thin plate 1 is not impaired, and desired recesses are formed in the structure.

Next, FIGS. 4 and 5 show another embodiment in which an opening is required in the final shape of the structure. The thin plate 5 for the structure is made of aluminum alloy, which is the same material as in the above embodiment, and has a thickness of 0.8M, and its plane has protrusions 5a at predetermined intervals on the periphery and inside. A recess 6 having a depth of 0°5rr1 m is formed except for the opening, and an extension 5b protruding outward is provided at the portion that should become the opening. An aluminum brazing material having a thickness of 0.2 mm is interposed between the thin plates 5, 5 to form a laminated material. Note that the aluminum brazing material (not shown) is a composite material in which an aluminum structural material is laminated between two aluminum brazing plates made of JIS A4004 alloy. The TftR material described above is brazed under the same conditions as in the previous example. After brazing, the extension 5b of the laminate is cut out and an opening 5 is formed in the laminate.
Form c and rf! i Obtain the corpse.

FIGS. 6 to 8 show still other embodiments,
The final shaped structure is formed with open side edges facing each other. The thin plate 10 for this structure is made of aluminum alloy, which is the same material as in the previous embodiment, and has a thickness of 1.5 mm, and has an extension 10a + 10a along the entire length of the side edge where the opening should be made. They are placed facing each other. Moreover, a meandering recess 10b is formed inside the plane. An aluminum brazing material 7 with a thickness of 0.5 mm is interposed between the thin plates 10 and 10 in the same way as in the previous embodiment, and a thin plate 14 for a lid is laminated and brazed on the uppermost surface. The edges are cut to form an opening edge 10c to obtain a structure. Note that this aluminum brazing material 7 is preliminarily bonded to a thin plate 10.
It is also possible to interpose the brazing material between the thin plates by using a welded material by rolling or the like on the lower surface shown in the figure (the surface not having the recess 10b) and stacking these.

FIGS. 9 and 10 show still another embodiment, in which the tlI body to be manufactured has a structure in which disk-shaped thin plates are laminated, and each thin plate 11 has a hole in the core.
A recessed portion is formed in the flat portion of the recessed portion so as to have a protrusion in the radial direction.

This disc-shaped thin plate 11 for a structure has the above-mentioned recess 12 formed therein, and an annular portion 11a formed in a portion that should become a hole. This disk-shaped thin plate 11 is brazed with an aluminum brazing material interposed therebetween in the same manner as in the previous embodiment, and after brazing, the annular portion 11a is cut out to obtain a structure having a hole portion 13.

In each of the above-mentioned embodiments, the thin plate has a part that should be an exhaust hole or an opening, but it is also possible to braze a thin plate that does not have an exhaust hole or a part that should be an opening. , it goes without saying that the present J711 invention can be similarly applied.

(Effects of the Invention) As explained above, according to the present invention, the recess provided on the joint surface side of the thin plate is surrounded and sealed by the aluminum brazing material located at the edge of the thin plate, and the laminated material is placed in a high-temperature reduced-pressure atmosphere to melt the brazing material, then the laminated material is cooled to a temperature below the intermediate temperature between the liquidus line and the solidus line of the brazing material, and then the laminated material is placed in a normal pressure atmosphere. This prevents excess brazing material from being drawn out and from accumulating in the four parts and filling the recesses. Moreover, since the Wt layer material was cooled to below the above-mentioned intermediate temperature and then placed in a normal pressure atmosphere, backflow of the brazing material was prevented and brazing was performed satisfactorily.

In addition, if the four parts are communicated with the outside of the laminated material through through holes provided in the side walls of the thin plates, the internal gas can be efficiently discharged to the outside, improving manufacturing efficiency.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a thin plate used in an embodiment of this invention;
Figure 2 is a perspective view of the brazing material, Figure 3 is a cross-sectional view of the laminated material, Figure 4 is a plan view of a thin plate used in another embodiment, and Figure 5 is a view of the same with openings provided. FIG. 6 is a plan view of a thin plate used in another embodiment; FIG. 7 is a plan view of the thin plate with openings provided;
No. 8 is a cross-sectional view of the laminated material, FIG. 9 is a plan view of a thin plate used in another embodiment, and FIG. 10 is a plan view of the thin plate with openings provided therein. 1.5.10.11... Thin plate 1a... Exhaust hole 2.
... Recessed part 3 ... Aluminum brazing material 4.8 ... Laminated material 6 ... Recessed part 7 ... Aluminum brazing material 10a ... Extension part 10
b... Extension part 12... Concave part Fig. 6 Fig. 7 0c Fig. 8 1a

Claims (1)

[Scope of Claims] 1. In a method for manufacturing a laminated structure in which a laminated material in which an aluminum brazing material is interposed between thin plates for a structure mainly made of aluminum members is joined by brazing, the joint surface side of the thin plates is A recess provided in the thin plate is surrounded and sealed by an aluminum brazing material located at the edge of the thin plate, and the laminate is placed in a high-temperature, reduced-pressure atmosphere to melt the brazing material, and then the laminate is soldered. Method 2 for producing a laminated structure, characterized in that the material is cooled to a temperature below the intermediate temperature between the liquidus line and the solidus line of the material, and then the laminated material is placed in a normal pressure atmosphere. A method for manufacturing a laminated structure according to claim 1, characterized in that the exhaust hole provided communicates with the outside of the laminated material.