JPH0442102B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a monoface panel for heat exchange.

As a method for manufacturing such a panel, for example, the method described in French Patent No. 1456125 is known. An outline of this method will be explained based on FIGS. 5 and 6. A suitable substance for preventing the joining of the thin plates is applied in advance to two aluminum or aluminum alloy thin plates by printing, and the two thin plates are rolled using a rolling machine, excluding the coated areas. After joining, pressurized liquid or pressurized air is injected from the supply port of the unjoined part coated with a substance, and the unjoined part is expanded by liquid pressure or air, so that the main part is generally used as a heat exchanger. It consists of forming a circuit. Connect this circuit to one surface 22
If provided only on the other surface 23 of the panel 8
the other surface 2 of the panel 8 to prevent expansion of the
The above-described inflation operation is performed while applying sufficient hydraulic or pneumatic counterpressure to one surface 22 to prevent the inflation of 3. In this known art, the aforementioned circuit has a peripherally closed circuit 12 and an inner use circuit 13, which peripherally closed circuit 12 and inner use circuit 13 are connected to each other by means of a narrow joint provided in the vicinity of the supply opening of the peripherally closed circuit 12. separated. To this end, the circumferentially closed circuit 12 is first expanded to form a closed space 26 between the two plates 24, 25 of the press (FIG. 5), and then a counter pressure is applied to one surface 22 of the panel 8. The inner use circuit 13 is then formed by increasing the inflation pressure to open the aforementioned narrow joint passageway (FIG. 6).

This method has the following drawbacks.

1) One narrow passage must be provided for each internally used circuit, so the entire panel must generally have a plurality of narrow passages.

2) If the narrow passage is opened too early, a panel is formed with circuits on both sides of the panel, and the inner use circuit will not expand unless this opening is carried out at a pre-regulated pressure. In either case, the formed panel has no choice but to be discarded. However, this is highly dependent on the accuracy of the transverse dimensions of the narrow passage;
In this sense, the value of the dimension becomes extremely important, and the dimension intersection must be made small.

3) In order to increase the inflation pressure to open the narrow passage, the back pressure must also be increased. This is because in order to ensure sufficient dimensional tolerance of the formed panel, the difference between the inflation pressure and the back pressure must be kept constant at approximately ±5.
This is because it must be maintained at a value of bar (0.5 MPa). As a result, the load of the press used must also be increased. As an example,
An increase of 10 bar (1 MPa) corresponds to an increase in press load of 420 tons per 4200 mm x 1000 mm panel.

An object of the present invention is to provide a method for manufacturing a heat exchange monoface panel with a small number of steps and a high yield.

According to the present invention, the object is to prepare two rectangular thin plates made of either aluminum or aluminum alloy; a loop-shaped closed circuit along the periphery of one of the thin plates; an internal circuit remote from and inside the closed circuit; and a connection inside the closed circuit connecting the closed circuit and the internal circuit. a step of respectively setting a circuit, a step of applying non-bonding ink to the closed circuit, the internal circuit and the connection circuit, respectively, the closed circuit with the ink applied, the internal circuit with the ink applied, and bonding the one surface of the one thin plate to the one surface of the other of the two thin plates to form a panel, excluding the circuit coated with ink; and two pressure plates; expanding the closed circuit, and forming a sealed space between one of the pressure plates and the other surface of the panel by the expansion of the closed circuit; ,
After the sealed space is formed, injecting one pressurized fluid into the connecting circuit and the internal circuit through the closed circuit to expand the connecting circuit and the internal circuit, and adding another pressurized fluid to the sealed space. injecting a pressurized fluid; and maintaining the one pressurized fluid at a first pressure and the other pressurized fluid at a second pressure lower than the first pressure for a predetermined period of time. and after the period has elapsed, decreasing the first pressure and the second pressure, respectively, until the difference between the first pressure and the second pressure decreases to a predetermined value. , when the difference decreases to the value, the one pressurized fluid injected into the closed circuit, the connection circuit, and the internal circuit is discharged to the outside of the panel, and the one pressurized fluid injected into the closed space is discharged. discharging another pressurized fluid to the outside of the closed space; and removing the panel from between the pressurizing plates after discharging the one pressurized fluid and the other pressurized fluid, respectively. and the length and width of the connecting circuit are such that when the one pressurized fluid is injected into the closed circuit, a predetermined period of time elapses from when the closed circuit expands until when the internal circuit begins to expand. This is achieved by a method of manufacturing a heat exchange monoface panel which is selected such that

In the present invention, one pressurized fluid is injected into a closed circuit set on one thin plate of a panel disposed between two pressure plates and coated with non-bonding ink, and the closed circuit is completed. After expanding to form a sealed space, one pressurized fluid is injected into the connecting circuit and the internal circuit through a closed circuit to expand the connecting circuit and the internal circuit, and another pressurized fluid is injected into the sealed space. After maintaining the first pressure of one pressurized fluid and the second pressure of another pressurized fluid lower than the first pressure for a predetermined period, the first pressure and the second pressure are maintained.
the first and second pressures are respectively decreased until the difference between the pressure and the pressure of , the length and width of the connecting circuit are selected such that when one pressurized fluid is injected into the closed circuit, a predetermined time elapses after the closed circuit expands and before the inner circuit begins to expand. Therefore, as long as the panel is large enough to be placed in the gap defined by two pressure plates, the same pressure plate can be used even if the size of the panel and the shape of the internal circuit to be formed are different. Therefore, it is possible to form a panel having an internal circuit of any shape, and by adjusting the gap between the two pressure plates on which the panel is placed, the internal circuit after expansion can be formed to a desired height. A predetermined monoface panel having an internal circuit on one side can be manufactured at a high yield and at low cost without requiring heat softening.

The intermediate body of the panel according to the present invention becomes a predetermined panel through the following steps.

On one of the thin plates constituting the intermediate member of the panel, a suitable ink is applied to the non-bonded portion defining a circuit consisting of the following parts to prevent the bonding of the thin plates.

1) A loop-like closed circuit along the periphery that receives fluid through passages communicating with the edge of the panel. In order to inflate only one surface of the panel with respect to the internal circuit, the closed circuit is inflated to form a closed space between it and the plate of the press, and this closed space is sufficiently inflated to prevent expansion of the other surface of the panel. This closed circuit is used to apply a counterpressure.

2) Internal circuit. It may optionally consist of one or more individual parts.

3) One or more connecting circuits connecting the closed circuit and the internal circuit. This connecting circuit has a constant width and length, the values of which are large enough so that the expansion of the internal circuit is carried out at the expansion pressure of the closed circuit, unlike prior art methods where an increase in pressure is required; , is large enough so that the time spent in the gradual formation of the internal circuits is long enough so that the back pressure necessary to obtain a monoface panel is established before deformation of the internal circuits. The developed length of the connecting circuit should be greater than 0.5 times the length of the long side of the panel to be manufactured, and usually 1 to 3 times this length. This connection circuit is preferably linear and extends in the longitudinal direction of the panel. If you do this,
The closed circuit is connected to the internal circuit via a connecting circuit from a point located opposite the inlet of the inflation fluid. The inflation pressure is 120-150 bar (12-
15 MPa) and the corresponding back pressure is adjusted to 50-70 bar (5-7 MPa).

A detailed explanation will be given below by giving non-limiting examples based on the accompanying drawings.

FIG. 1 shows a panel intermediate body produced according to the invention, in which a loop-shaped closed circuit 1 is located on the edge 3 of the panel intermediate body 4 with a fluid inlet 2.
It is equipped with The part 5 to be formed into the final product panel is defined by the dotted line in FIG. 1 and contains internal circuitry 6. A connecting circuit 7 is disposed between the circuit 1 and the circuit 6, and the deformation time of the circuit 7 is 2 seconds under the aforementioned selected pressure condition.
It typically has a sufficiently long length and a sufficiently small width or cross-section to exceed 3 seconds.

Another panel intermediate manufactured according to the present invention will be described with reference to FIG. The intermediate part of this panel is formed with a part 5 having two internal circuits shown by broken lines in one loop-shaped closed circuit 1, and one connecting circuit 7 is connected to the lower part of the part 5. The upper portions of each portion 5 are connected to each other. A fluid inlet is provided at the top of the circuit 1.

Still another intermediate panel manufactured by the present invention will be described with reference to FIG. The intermediate body of this panel includes one loop-shaped closed circuit 1
A portion 5 having two internal circuits indicated by broken lines is formed within the portion 5 , and each of the two connection circuits 7 connects the lower portion of the portion 5 and the upper portion of the portion 5 . A fluid inlet is provided at the top of the circuit 1.

A specific example of the manufacturing method of the present invention will be explained with reference to the manufacturing method of the panel shown in FIG.

1) A5 by standard AFNOR NF A 50-451
The aluminum is cold-rolled to a thickness of 2.9 mm.
A thin plate of mm thickness is formed, and a suitable ink is applied onto the non-bonded portions of the thin plate to prevent bonding of the thin plate in a form in which the entire circuit is scaled down in longitudinal dimension. This thin plate is joined to other thin plates formed in the same manner so as to face each other.

2) The whole body is hot rolled to a total thickness of 1.45
mm and form a panel.

3) This is then placed between the plates of a pressure press. The distance of the gap between the plates is equal to the total height of the closed circuit to be formed, ie 3 mm.

4) Slightly open the closed circuit at the edge of the panel to form an inlet for the inflation pressurized fluid and insert the pressurized fluid inlet therein. This pressurized fluid is here compressed air.

The injection of compressed air into the circuit and into the counterpressure zone (between the upper plate and the closed circuit 1 of the panel 4, i.e. the closed space) is carried out by means of regulated electric valves. If necessary, the electric valve is controlled by a manostat (a gas constant flow device that uses a pressure difference).

The manufacturing method for the panels in FIGS. 1 and 3 is similar to that for the panel in FIG. 2.

FIG. 4 is a graph representing pressure as a function of time. As is clear from this graph, the back pressure injected into the sealed space is 0.2 after the introduction of the circuit expansion pressure.
Introduced in ~0.5 seconds. After the circuit expansion, the pressure in the used circuit portion is reduced, and the back pressure is also reduced to maintain a higher pressure difference in the used circuit portion to avoid circuit destruction. This pressure difference is 1MPa (10
When the pressure is below 100 mbar), release the pressure press.
In this case, the circuit expansion time is 8 seconds and the decompression time is 10 seconds.
Seconds.

The formed panel is then removed from the press and subjected to cutting and finishing according to conventional techniques.

[Brief explanation of drawings]

FIGS. 1, 2, and 3 are explanatory diagrams each showing a panel intermediate manufactured by a specific example of the manufacturing method of the present invention, and FIG. 4 is a case in which the panel intermediate shown in FIG. 2 is manufactured. FIGS. 5 and 6 are graphs showing pressure and back pressure as a function of time, and are diagrams illustrating a typical panel manufacturing method. 1...Closed circuit, 2...Inlet, 4...Panel, 6...Internal circuit, 7...Connection circuit.

Claims (1)

[Scope of Claims] 1. A step of preparing two rectangular thin plates made of either aluminum or an aluminum alloy; a loop-shaped closed circuit along the periphery of the thin plate; an internal circuit remote from the closed circuit and inside the closed circuit; and a connecting circuit inside the closed circuit and connecting the closed circuit and the internal circuit. a step of applying a non-bonding ink to the closed circuit, the internal circuit and the connection circuit, respectively; a step of applying non-bonding ink to the closed circuit, the internal circuit to which the ink is applied, and the ink to the closed circuit, the internal circuit to which the ink is applied, and the ink to the closed circuit, the internal circuit to which the ink is applied; bonding the one surface of the one thin plate to the one surface of the other of the two thin plates to form a panel, excluding the applied connection circuit; placing the panel between one surface of the pressurizing plate and the other surface of the panel by injecting a pressurized fluid into the closed circuit to inflate the closed circuit; and, after the sealed space is formed, injecting one pressurized fluid into the connecting circuit and the internal circuit through the closed circuit, and forming a closed space between the connecting circuit and the internal circuit. and injecting another pressurized fluid into the closed space, and for a predetermined period, the one pressurized fluid is brought to a first pressure and the other pressurized fluid is brought to the first pressure. and maintaining the first pressure at a second pressure lower than the first pressure until the difference between the first pressure and the second pressure decreases to a predetermined value after the period has elapsed. and when the difference is reduced to the value, the one pressurized fluid injected into the closed circuit, the connection circuit, and the internal circuit is external to the panel. and discharging the other pressurized fluid injected into the closed space to the outside of the closed space, and after respectively discharging the one pressurized fluid and the other pressurized fluid, removing the panel from between the pressure plates, the length and width of the connection circuit being equal to the length and width of the connection circuit after the closed circuit expands when the one pressurized fluid is injected into the closed circuit. A method of manufacturing a heat exchange monoface panel, wherein the method is selected such that a predetermined period of time elapses before the internal circuit begins to expand. 2. The manufacturing method according to claim 1, wherein the time during which the connection circuit is expanded is 2 seconds or more. 3. The manufacturing method according to claim 1 or 2, wherein the length of the connection circuit is 1 to 3 times the length of the long side of the one panel. 4. Any one of claims 1 to 3, wherein the position where the connection circuit is connected to the closed circuit is opposite to the position where the one pressurized fluid is injected into the closed circuit. The manufacturing method described in.