DE1753860A1 - PROCESS FOR PRODUCING A COMPOSITE BODY CONTAINING A DUCT SYSTEM - Google Patents

Description

"Method for producing a system containing a duct system Composite body ^ "

(Addition to Pater.t ....... (patent application P 1 "4 " J9 560.9-16))

Priority: November 2, 1964, V.St.A., No. 4o8 3o4

The invention relates to a method according to the generic term of the claim.

The invention relates to a method for producing sheet-like Bodies with outwardly protruding hollow strands or channels, in particular for the construction of heat exchangers by expanding plate material, in particular a method for production a novel pressure-resistant seal, which surrounds the pattern to be expanded, made of novel in the method according to the invention used blanks.

The invention relates primarily to the expansion of blanks, which consist of two superimposed metal plates, between which there are unwelded areas, but can

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the method according to the invention also in the case of non-metallic multilayer plates, e.g. made of plastic, and in the case of blanks which consist of sheets of different materials, such as metal and plastic, placed one on top of the other, between which there is a non-welded area.

The sheet-like bodies, which preferably consist of welded metal plates placed one on top of the other, with protruding outwards Hollow strands or channels can be made in a number of ways; however, they become the most beneficial and preferably according to the US patent or 5.f: -. 2 690 002 described Walζschweißverfahren manufactured.

This procedure applies to the clean surface of a metal plate applied a pattern of weld preventing material. A second metal plate with a clean surface is placed over it, the two plates are secured against mutual displacement and then by pressure welding, e.g. by hot rolling, in the superimposed areas on which no weld-preventing material has been applied, welded together. By hot rolling the plates, they become thinner and the obtained blank is in the rolling direction elongated, while its width is practically the same as that of the original panels. After the pressure welding, the obtained The blank can be made softer and thus more flexible, e.g. by heating, and then, if necessary, by cold rolling brought to its final mass and again softened e.g. by heating. By applying the the weld preventive material is obtained between the layers of the

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Press-welded blank a sample of an unwelded area. After pressure welding the blank, preferably after it has been softened by heating, the unsealed area or pattern between the layers is introduced by introduction a liquid or a gas expanded under pressure. This pressure must be so high that they did not weld Areas or patterns between the plates of the blank are permanently expanded and the desired corresponding system of channels form.

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This process can also be used for the production of surface-shaped Bodies are applied in a known manner only have flared or bulged channels on one side. The inventive method relates to the production of surface-shaped Bodies that are known in the professional world as "one-side-flat" are known, i.e. have widened channels only on one side, as well as flat bodies, which are called "modified-oneside-flat" , i.e. those whose channels are on the one side of the body is more dilated than that others.

One of the common methods of expanding a pressure welded • th blank is characterized in that the blank is held from the outside by at least one rigid press plate and that from the outside a pressure medium acts on only one side of the blank. One side of the blank lies on a press plate on with a suitable, e.g. preferably flat surface before, while on the other side a liquid or a gas, preferably compressed air, but also another, non-compressible

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Liquid, such as water, oil and the like, acts on the blank, so that this, during the introduction of a print medium into the unsealed areas or patterns, firmly between the press platen and the liquid or gas is held. This pressure medium located outside the blank can be in a chamber or a trough of a second rigid press plate and with this together the height and shape of the expanded areas regulate the blank. The trough, the depth of which corresponds to the desired final widening height of the widened areas of the blank corresponds, can either be contained in the second press plate, or i ^ can be achieved by that one then the blank, e.g. by a rubber seal placed between the blank and the second press plate at a distance.

A conventional device for expanding such blanks thus consists of the following parts: An expanding press with a flat, movable press platen and a fixed press platen with a trough-shaped pressure chamber into which one side of the blank is expanded; a sealing ring surrounding the portion of the trough into which the blank expands; a hydraulic motor that drives the moving press platen raises and lowers and thereby opens and closes the press.

The conventional method for expanding such blanks thus comprises the following stages: the blank is over the trough in the fixed or stationary press plate and the press closed, so that the blank between the press plates is clamped and one side of the blank by means of a sealing ring is pressure-resistant over the trough and is in this

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can expand. Then is under a pressure of about 70 kg / cm ^ a liquid or a gas introduced into the trough, whereby the blank is held and the other side rests flush on the second, flat press plate. Then under a pressure of about 211 kg / cirr a liquid or a gas hydraulic expansion in the unwelded system of the later Channels of the blank introduced so that the walls of these channels on the lower side of the blank into the trough? stretch. The two hydraulic pressures for holding or expanding the blank are now released, the press is opened, and the expanded body is removed.

There are some in the method outlined above Trouble. First, presses and seals need to be adapted accordingly the size of the blanks have different sizes. For all Presses and seals that can be used for sizes of blanks are uneconomical. The assembly and disassembly of the various press plates damages the presses and requires a long work preparation time. Second, rubber seals break easily under pressure / and their replacement is a considerable one Loss of production time.

Such a method is already known from US Pat. No. 3,127,860 for producing a composite body containing a duct system known, with a welding-preventing release agent accordingly the duct system is placed on a flat plate and at least one point is led to the edge of the plate, the plate is welded to a second flat plate at its release agent-free areas and the duct system from the edge point is inflated by means of a pressure medium, the. . 509886/0485

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Composite panel on one outer surface by a pressure medium and is supported on the other outer surface on a flat surface.

The method according to the invention is based on the object of not using a conventional rubber seal or at least consumption to restrict considerably on seals.

In the main patent it was already suggested that on the first flat Plate also has a welding-preventing separating means in its edge area corresponding to an annular, independent of the channel system and at a point leading to the edge sealing bead on-P worn and the sealing bead before the channel system is inflated

j is inflated, and possibly after inflating the duct system the edge area with the sealing bead is cut off. The embodiment of the main patent avoids a rubber seal even completely. In the present case, a possibility is given of drastically reducing the effort required in any case.

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For this purpose, it is provided according to the present invention that the separating agent corresponding to the sealing bead is applied to the first plate with complete separation from the separating agent corresponding to the channel system in such a way that the latter and its guidance to the edge of the first plate along an incomplete and separate to the edge of the First plate guided ring encloses, and that a complementary to the incomplete sealing ring / ulstring ring area of the first plate is sealed to the outside by means of a separate seal.

By initially expanding one along the edges of the blank running tube, separate sealing material is largely unnecessary. Through the contact between this tube and the holding device for the blank is a pressure

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Achieved seal, which was previously made by special press plates and rubber sealing rings or the like. ·

The method according to the invention and the novel blank make it possible it is to use the cheapest press plate sizes for all bodies to be produced. In addition, practically arises no more wasted time changing seals or damaged press plates.

The purpose of the invention is thus to address the disadvantages mentioned above the production of such sheet-like bodies with the outside to fix protruding hollow strands and manufacture these bodies without using the conventional rubber seals.

The invention thus relates to a method of production of sheet-like, preferably roll-welded bodies with outwardly protruding hollow strands or channels by widening them a roll-welded blank consisting of two plates placed one on top of the other, in which the plates are attached to certain Points are welded to one another and patterns of a material preventing welding are applied to the remaining points are, with the help of a printing medium, which is thereby marked. net is that

A) first along the edges of the blank between the plates applied pattern in order to achieve a pressure-resistant edge-shaped Seal between the blank and a retainer, and

B) then the pattern applied inside the blank

is widened. '.

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The invention is explained in more detail below with reference to the accompanying drawings.

Fig. 1 is a perspective view of a metal plate with a weld preventing pattern on its surface Material is applied.

FIG. 2 shows schematically and in a perspective view the metal plate from FIG. 1, over which a second metal plate is placed with a pattern of a weld-preventing material placed between the two plates, and the two plates are welded to one another by passing them through between two rollers.

Fig. 3 "" is a cross section through an embodiment of the im inventive method used blank, wherein the Plate is shown with the pattern of weld preventing material applied.

Fig. 4 is a view corresponding to Fig. 3 and shows a second embodiment of that used in the present invention Blank, with part of the overlying plate shown in its arrangement.

Figure 5 is a sectional view of the blank used in the present invention during the first stage of the method of the present invention .

FIG. 6 shows, similarly to FIG. 5, the second stage of the invention Procedure.

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Figri. 1 and 2 illustrate the manufacture of blanks according to the roll welding process. Fig. 1 shows a metal plate 1, on the clean surface 2 of which a pattern of a welding preventing material 3 is applied. 2 shows the plate 1 over which a second metal plate 4 is placed, the pattern of a material 3 preventing welding being introduced between the two plates 1 and 4. The plates 1 and 4 are connected to one another by spot welds 5, as a result of which they cannot move against one another during the subsequent welding by passing them through between the pair of rollers 6. The welding creates. the blank 7. Usually, the plates 1 and 4 must be heated by means of the roller pair before welding, so that they can be connected to one another by means of the usual rolling years. The plates 1 and 4 are separated from one another in certain areas by a welding-preventing material 3, which results in a pattern of an area not welded to one another as in FIG. 1. .

Figs. 3 and 4 show the different embodiments of the im blanks used according to the invention. The embodiment shown in Fig. 3 shows a blank, which consists of a metal plate 8 and a pattern 9 applied thereon of a weld preventing material. The pattern persists an inlet 10 at the edge 11 of the plate 8 and a pattern 12 along the periphery of the plate 8. The pattern 12 encloses a second pattern 13, which at one end on the through the reference numeral 14 is connected to the pattern 12 is, but at the opposite end 14 * at a certain distance from the pattern 12 ends. The pattern 13 can accordingly

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its intended use and the conditions set by the consumer have any shape. At the junction 14 between the two patterns 12 and 13 there is a throttle point 15. This throttle point 15 is formed when the blank is assembled from the plate 1 and 4; when applying of the welding preventing material 9, a stencil pattern is used to form the throttle point in the material. This narrowing is used to reduce the pressure, which will be discussed below. Of course, the Plate 8 placed a second plate in the manner described above.

Fig. 4 shows another blank consisting of a plate 16, to which two samples 17 and 18 of a weld preventing material are applied. One pattern 17 runs along the edges of the plate 16 and encloses the pattern 18, the same as the pattern 13 in Fig. 3 can have any desired shape. Both patterns 17 and 18 start at the outer edge of the Plate 16, at inlets 19 and 20, run across the plate 16 and then return to the outer edge at 21 and 22. A second, partially shown in the upper part of the drawing 4, plate is over the plate 16 in the manner described above placed. For reasons to be explained below, a rubber seal 23 is applied across the finished blank Patterns 17 and 18, placed near their inlets 19, 20 and their ends 21, 22, respectively.

Figs. 5 and 6 illustrate the subsequent expansion of the two blanks used in the method according to the invention. There

- the expansion of the second embodiment of the blank on the same, in FIGS. 5 and 6 is the same as the first Embodiment, is only expanding the first embodiment described, whereby it goes without saying that references the first pattern 12 and the second pattern 13 on the blank 8 the same applies to the corresponding parts 16, 17 and 18 of the second Apply to the embodiment. .

The blank 8 is first placed on a press plate 24 of a press placed. The second press plate 25 is then lowered so far / that the space between blank .r.d of the press plate 25 the height of the desired expansion in the completed one Body corresponds. The pattern 12 is then known per se Manner expanded by means of appropriate application of internal pressure. For reasons to be explained below, this pressure is higher than that used to expand the pattern 13 later Pressure that initially remains unexpanded. In the event of of the blank of Fig. 3, the pressure through the inlet 10 into the Pattern 12 introduced; the pattern 13 is thereby caused by the pressure not widened, since this is insufficient, the throttle point 15 break up. In the case of the blank of FIG. 4, the pressure introduced through the inlet 19 and only the pattern 17 expanded, since in this embodiment of the blank the patterns 17 and 18 are not related to each other.

A suitable widening of the pattern 12, so that the press plate 25 rests flush on the pattern 12, results in a pressure-tight seal between the blank 8 and the press plate 25, the space between the two having the reference numeral 26 generally •, 50988G / 048S

is marked. The pressure introduced into the space 26, the press plate pressure, holds the blank 8 on the press plate 24 and determines the amount of the subsequent widening of the pattern by suitable regulation in a manner known per se For example, sheet-like bodies with hollow strands that are more widened on one side than on the other, are produced by lowering the press plate pressure, whereby the blank on the side facing the press plate 24 is expanded to a predetermined extent. In the inventive Method, a higher press plate pressure than with the conventional devices can be used because the Pattern 12 widening internal pressure can be significantly higher than the press plate pressure and thus a much better one with the conventional rubber seals unachievable seal is obtained.

During the subsequent widening of the pattern 13 shown in FIG. 6, a pressure which is sufficient for widening is applied to the pattern 13 brought in. In the case of the blank of FIG. 3, the throttle section 15 breaks open at concession pressure and that which is introduced at the inlet 10 Pressure spreads across the pattern 13. The pressure required to break the throttle path 15 depends on it Cross-section, which depends on the corresponding decompression value calculated. For example, the throttle point 15 at a

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Pressure of 183 kg / cm within the sample 12 and a press

plate pressure of about 59.50 kg / cm so that they

within a range of about 84.50 kg / cm to about

126.50 kg / cm ² breaks up.

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In the case of the blank in FIG. 4, a control valve 27 seals the widened pattern 17, which on its opposite End 22 is closed, and the automatic control valve introduces the expansion pressure in the pattern 18, which is on his opposite end 21 is closed. In the embodiment in FIG. 4, this surrounds the edges of the blank 16 running pattern 17 does not completely match pattern 18, requiring a short rubber gasket 23 to seal the area where the Pattern 17 does not enclose the pattern 18 to seal.

- After widening the pattern 12, the pressure can be applied throughout System are relieved. The pressure introduced into the blank of Fig. 3 is through the restriction 15 and the inlet ai ^ f normal pressure is reduced, and in the case of the blank of FIG the pressure through the control valves 27 and 28 is reduced. The expanded blank is removed from the press, the sample 12 is cut off and thrown away, and the body obtained init the pattern 13 can now be further processed according to the intended use. ..

Claim

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Claims (1)

Claim Method for producing a composite body containing a duct system, in particular a heat exchanger, wherein an anti-welding separating agent is applied to a flat plate in accordance with the channel system and to at least one Place up to the edge of the plate, the plate in its release agent-free areas with a second flat plate welded and from the Rands'telle the channel system is inflated by means of a pressure medium, the composite panel on the one outer surface is supported by a pressure medium and on the other outer surface on a flat surface, and wherein according to patent (patent application P 14 79 560.9-16) on the first flat plate also has a weld-preventing plate in its edge area Separating means corresponding to an annular sealing bead that is independent of the channel system and led at one point to the edge applied and the sealing bead is inflated before the duct system is inflated, and optionally after inflation of the channel system, the edge area with the sealing bead is cut off, characterized in that the sealing bead corresponding separating means on the first plate with complete separation from that corresponding to the channel system Release agent is applied in such a way that it is the latter and its leadership to the edge of the first plate along an incomplete 5 098 86 / i (U8 5 niy.'ic-p! "■ *! ■ * ■ 7 5 ¹ A '? s _s ? No. 1 Saw 3" fei Xfi3STUHBI9 »* 4.S. Ιύ:. and surrounds separately guided to the edge of the first plate ring, and that a complementary to the incomplete sealing Vmlstring Ring area of the first plate is sealed to the outside by means of a separate seal. 5 0 9 8 8 6 / 0.4 8 5