DE102008048576A1 - Manufacturing process, extruder and die for an extruded hollow section and extruded hollow section and heat exchanger with an extruded hollow profile - Google Patents

Abstract

The invention relates to a production method for an extruded hollow profile (1) on an extruder, in particular for an extruded tube on an extruder, which extruded hollow profile (1) comprises: a jacket (3) and a cavity (5) and wherein Jacket (3) with at least one of the cavity (5) facing inner layer (9) is provided and wherein the inner layer (9) during extrusion of the extruded hollow profile (1) is formed. The invention also leads to an extruder, a die (10) and an extruded hollow profile (1) and a heat exchanger with an extruded hollow profile (1).

Description

The The invention relates to a production method for an extruded hollow profile on an extruder having extruded hollow profile: a sheath and a cavity and wherein the sheath with at least a cavity facing the inner layer is provided. The invention further relates to an extrusion press for such an extruded hollow profile, wherein the extruder comprises: a die a receptacle for a blank and a hood for the jacket of the Extruded hollow profile. The invention also relates to a die for an extruder for such an extruded hollow profile, wherein the die comprises: a receptacle for a blank and a vent area for the shell of the extruded hollow profile. Further The invention relates to an extruded hollow profile, in particular an extrusion tube comprising: a shell and a cavity and wherein the jacket with at least one inner layer facing the cavity is provided. The invention also leads to a heat exchanger with the extruded hollow profile.

One Extruded hollow profile, in particular an extruded tube, the beginning mentioned type, in particular for use in a heat exchanger be provided of the type mentioned. To increase the resistance of extruded hollow sections, in particular When used in heat exchangers, it is well known the mold-forming extrusion process, the hollow section another - separate - coating process undergo at least one on the inside of the shell To install the cavity facing inner layer. The so provided Inner layer can have a variety of functions, eg. B. against Protect abrasion or corrosion.

Basically, for example EP 0 473 103 B1 or DE 694 02 800 T2 or US 4,262,627 Method known to on the inside of a shell of a tube of a general type, an inner cavity facing the inner layer, as a so-called "liner" material ", to install. So revealed EP 0473103 B1 a method for treating water pipes and gas pipes, in which a sponge is introduced for a multi-branch piping system after the coating step for forming the coating surface in the pipeline under compressed air. Out US 4,262,627 It is known to provide two probes for the production of tubes with a large cross-section, wherein an abrasion probe is to prime an inner surface and a coating probe is provided for coating the inner surface. Out DE 794 02 800 T2 a method for coating the inner surface of hydrothermal plumbing tubes is known in which, after coating the inside of the pipe with resinous liquid, a gasketed head is inserted into the pipe and is moved by means of compressed air within the pipe, the inside of the Tube is scraped off.

method such kind are not suitable for the production of extruded hollow profiles, which regularly has a comparatively small opening cross-section have, in particular not for the production of extruded hollow sections, which are designed for use in a heat exchanger are. In addition, the introduction of processing probes connected in a hollow profile with great effort, which are avoided should.

In principle, extrusion processes for hollow sections such as extruded tubes od. Like. B. off DE 102 32 608 B4 known. A device in the form of an extruder and a suitable die for representing an extruded profile, for example, in EP 0 329 567 B1 disclosed.

A manufacturing method for a component, in particular intended for use in a heat exchanger, of a general type, which is suitable for adding an inner layer to a cavity-facing side, is known, for example, from the application DE 10 2007 035 221 A1 the applicant known. In principle, such a method is also suitable for the coating of comparatively complicated three-dimensional internal structures such as tube inner sides with flow-guiding elements or the like. Basically, such a method also proves to be advantageous in order to apply a uniform layer on the inside of a hollow profile. When used for heat exchangers, this has the advantage that heat transfer can be realized comparatively well, ie with high efficiency. The aforementioned method based on a CVD process of the applicant is in the context of a manufacturing process for an extruded hollow section on an extruder still in need of improvement.

At this point is the invention of whose task it is a Method and a device of the type mentioned as well as to specify an extruded profile and a heat exchanger by means of one facing a cavity of an extruded hollow profile Inner layer particularly reliable and easy at the same time can be applied.

The The object is with regard to the manufacturing process by a manufacturing process of the type mentioned above, provided in accordance with the invention is that the inner layer during extrusion of the extruded hollow section is formed.

In principle, with regard to the application of the inner layer, the in DE 10 2007 035 221 A1 said process parameters are advantageously used to achieve a relatively uniform and continuous inner layer, which to allow a particularly advantageous heat transfer in an extruded hollow section, in particular in an extrusion tube, which is designed for a heat exchanger. The disclosure of the DE 10 2007 035 221 A1 The invention is moreover based on the consideration that in the production of extruded hollow sections special conditions are present, which make it possible, a cavity facing the inner layer to apply in a particularly advantageous manner. The invention has recognized that an advantageous application of an inner layer is possible if this is formed during the extrusion of the extruded hollow profile. The essential finding of the invention lies in the fact that process conditions during extrusion can be used advantageously for a coating process.

• – Strangpressen eines Rohlings durch eine Matrize der Strangpresse unter Bildung des Mantels des Strangpress-Hohlprofils, und
• – Einbringen eines Fluids in den Hohlraum des Mantels unter Bildung der Innenschicht, wobei die Bildung der Innenschicht unmittelbar nach der Bildung des Mantels erfolgt.

Within the scope of a particularly preferred development of the concept of the invention, it is provided that the production method has in particular the steps:

• - Extruding a blank through a die of the extruder to form the shell of the extruded hollow profile, and
• - Introducing a fluid into the cavity of the shell to form the inner layer, wherein the formation of the inner layer takes place immediately after the formation of the shell.

A particularly preferred embodiment provides that the fluid is a gas. In particular, the formation of the inner layer can take place by means of a CVD process. This is done in detail on the advantageous parameters of a CVD process, as in DE 10 2007 035 221 A1 is referenced.

Corresponding The concept of the invention also applies to an extrusion press for an extruded hollow profile according to the the aforementioned type, wherein according to the invention a in the exhaust area opening fluid supply for a fluid suitable for forming the inner layer is provided. Accordingly, the concept of the invention also applies to a die for an extruder according to the aforementioned Type, according to the invention one in the fume hood opening fluid supply for an education the inner layer suitable fluid is provided.

The The invention has recognized that by establishing a fluid supply in the extraction area of an extruder or die a fluid, in particular a Gas, preferably a reactive gas, for. In the context of a CVD process, can be introduced into the cavity of the extruded profile, so that an inner coating by introducing the fluid immediately after the extrusion of the blank can be done, in particular directly on the extruder. This is the manufacturing process in a particularly preferred embodiment, that the extrusion a blank from a recording by a die in a fume hood takes place for a shell of the extruded hollow profile and that Introducing the fluid into the cavity in the fume hood takes place. Advantageously, in the context of the concept of the invention, the introduction takes place the fluid immediately after, in particular through, the die.

In order to eliminates costly additional separate process steps to be set up, as necessary in the prior art; rather, you can all requirements for an internal coating in the frame the manufacturing process during extrusion are provided or in the case of an extrusion press in the draw-off area or in the case of a die be provided in the fume hood.

It has shown advantageous that according to the concept the invention an extruded hollow profile, in particular an extruded tube, comprising: a shell and a cavity, said shell having provided at least one cavity facing the inner layer is, and wherein the inner layer during extrusion of the extruded hollow profile is formed.

Advantageous such an inner layer is continuous and uniform educated. Above all, a CVD inner layer proves to be advantageous in the context of the concept of the invention.

The Invention also leads to a heat exchanger an extruded hollow profile of the aforementioned type.

Further advantageous developments of the invention are the dependent claims and indicate in particular advantageous possibilities, the concept explained above within the framework of the task as well as to realize further advantages.

In the context of a particularly preferred development, the die has a die axial part and a die peripheral part. It has been found that the introduction of the fluid can preferably take place through the die axial part. In particular, it is provided that the die axial part of Surrounding the female peripheral part.

Especially is to form an extruded hollow profile, preferably one Extrusion pipe, between the die axial part and the die peripheral part provided a gap. An interruption of the gap can serve the Fluid supply according to the concept of Continuing from the female peripheral part to the female axial part too to lead.

Advantageous At least two brackets are provided on the female axial part, which hold the die axial part on the die peripheral part. In a Particularly preferred development is intended that at least one of the holders for the arrangement of the fluid supply from Matrizen-peripheral part is used for Matrizen-axial part.

A discharges into the exhaust area discharging fluid supply advantageous in the axial direction in the extraction area. It has too shown that a number of mouths be beneficial can. So can one, two or more mouths be provided. So z. B. in that a fluid supply branches in the Matrizen-axial part in a suitable manner to a suitable number of mouths at the edge of the die axial part to allow.

Especially to form an extruded tube is the die, preferably the female axial part and the female peripheral part, substantially constructed centrosymmetrically.

embodiments The invention will now be described below with reference to the drawing. This is not necessarily the embodiments to scale, rather the drawing is where appropriate for illustrative purposes, in schematic and / or slightly distorted shape. With regard to supplements the teachings directly recognizable from the drawing will be referred to the pertinent ones Referenced prior art. It is important to take into account that varied modifications and changes concerning the shape and the detail of an embodiment can be made without departing from the general idea to deviate from the invention. The in the description, in the drawing and in the claims disclosed features of the invention can be used individually or in any combination be essential for the development of the invention. moreover fall within the scope of the invention, all combinations of at least two in the description, the drawing and / or the claims disclosed features. The general idea of the invention is not limited to the exact shape or detail shown below and described preferred embodiment or limited on an object that would be restricted in Comparison to the claimed in the claims subject. For specified design ranges should also within the specified Limiting values are disclosed as limit values and can be used as desired and claimable.

in the Individual shows the drawing in:

1 : A particularly preferred embodiment of a die for an extruder, for producing an extruded hollow profile in a plan view (B), a side view (A) and an end view (C) - this to illustrate a particularly preferred embodiment of a manufacturing method and a die and extruder according to the concept of the invention;

2 a preferred embodiment of an extruded hollow profile according to the concept of the invention in the form of an extruded tube.

1 shows a die 10 for use in an extrusion press, not shown, for producing an in 2 Extruded hollow sections shown in detail 1 in the form of an extruded tube. The extrusion tube 1 indicates: a coat 3 and a cavity 5 , where the coat 3 on its inside 7 with a cavity 5 facing inner layer 9 is provided. The present is the inner layer 9 formed as a CVD inner layer, which is formed in the context of a CVD process, which is implemented in an extrusion manufacturing process. In particular, the in DE 10 2007 035 221 A1 disclosed process parameters are used.

The matrix 10 is in 1 schematically shown and in this case has a female axial part 11 and a female peripheral part 12 on. The die axial part 11 This is essentially on an extrusion axis 13 arranged while the stencil-peripheral part 12 the die axial part 11 surrounds circumferentially. For the production of the coat 3 is a non-illustrated blank of a recording 15 through the matrix 10 into a fume hood 17 under formation of the coat 3 of the extruded tube 1 pressed. For this purpose, a non-illustrated press die of the extruder can serve, for example, the blank or the die 10 to move or otherwise deform the blank on the die 10 to effect. The tempered to a suitable extrusion temperature blank meets this in the recording 15 on the head of the die axial part 11 , deforms on this and is so in mantle-shaped extrusion openings 19 between female axial part 11 and female peripheral part 12 then pressed in a flowing motion the extruded coat 3 in the fume hood 17 to build. The deduction area 17 expands directly behind the die axial part 11 tapered to a slight expansion behavior of the still high-temperature jacket 3 Take into account.

Following the concept of the invention is the die 10 , in this case, the die axial part 11 , with a number of - in this case symbolically two - gas supplies 21 Mistake. The gas supplies 21 serve to supply a reactive gas 25 , In the present case, the gas supplies 21 mouths 23 in the cavity 5 of the coat 3 and bring the reactive gas 25 in the cavity 5 of the coat 3 one. The concept of the invention thus follows the introduction of the reactive gas 25 immediately after the matrix 10 ,

In general, the concept of the invention provides that the die 10 Has there everywhere mouths of fluid supplies, which in a cavity of the extruded profile 1 to lead. As a result, a, for example, from a outside of the extruder arranged reactive gas generator, emitted reactive gas 25 over the gas supplies 21 and the mouths 23 to desired locations in the extruded hollow profile 1 be delivered.

Because of the deduction area 17 prolonged tempering of the jacket 3 is an advantageous for the CVD process heat energy as activation energy for the reaction of the reactive gas 25 to disposal. For this reason, the reactive gas reacts 25 on the inside 7 of the coat 3 forming the inner layer 9 from. Regularly, as has been recognized by the concept of the invention, this leads to a particularly uniform and continuous inner layer 9 ,

The concept of the invention has thus surprisingly synergistically combined and advantageously utilized the process conditions of an extrusion process and a CVD process. Advantageously, subsequent process steps which would have been necessary according to the prior art are eliminated. On the other hand, the reached inner layer 9 of particularly good quality in the method proposed here. The from the hot forming of the blank to coat 3 The resulting heat is advantageously not only used as activation energy in the CVD process, but also degraded and leads overall to a suitable microstructure in the resulting extruded tube 1 ,

While the present invention based on a special symbolically represented die 10 has been described, it is to be understood that this embodiment is not meant to be limiting. Rather, the concept of the invention can also be applied to any extrusion tools, which provide corresponding fluid feeds for reactive fluids to introduce them into a cavity of an extruded hollow section and there an inner layer in the context of a z. B. to generate CVD process.

In summary, the invention relates to a production method for an extruded hollow profile 1 on an extruder, in particular for an extruded tube on an extruder, which extruded hollow profile 1 has a coat 3 and a cavity 5 and where the coat 3 with at least one of the cavity 5 facing inner layer 9 is provided, wherein the inner layer 9 during extrusion of the extruded hollow profile 1 is formed.

1

Extruded hollow section

3

coat

5

cavity

7

inside

9

inner layer

10

die

11

Template-axial part

12

Template peripheral part

13

Extrusion axis

15

admission

17

removal area

19

Extruded openings

21

gas supplies

23

mouths

25

reactive gas

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• EP 0473103 B1 [0003, 0003]
• - DE 69402800 T2 [0003]
• - US 4262627 [0003, 0003]
• - DE 79402800 T2 [0003]
• - DE 10232608 B4 [0005]
• EP 0329567 B1 [0005]
• - DE 102007035221 A1 [0006, 0009, 0009, 0011, 0028]

Claims (15)

Production method for an extruded hollow profile ( 1 ) on an extruder, in particular for an extruded tube on an extruder, which extruded hollow profile ( 1 ): a jacket ( 3 ) and a cavity ( 5 ) and where the jacket ( 3 ) with at least one cavity ( 5 ) facing inner layer ( 9 ), wherein the inner layer ( 9 ) during extrusion of the extruded hollow profile ( 1 ) is formed. Manufacturing method according to claim 1, characterized by the steps of: extruding a blank through a die ( 10 ) of the extruder to form the shell ( 3 ) of the extruded hollow profile ( 1 ), and - introducing a fluid into the cavity ( 5 ) of the jacket ( 3 ) forming the inner layer ( 9 ), wherein the formation of the inner layer ( 9 ) immediately after the formation of the coat ( 3 ) he follows. Production method according to claim 1 or 2, characterized characterized in that the introduction of the fluid immediately after the extrusion of the blank, in particular on the extruder, he follows. Manufacturing method according to one of claims 1 to 3, characterized in that the extrusion of a blank from a receptacle ( 15 ) through a die ( 10 ) into a fume hood ( 17 ) for a coat ( 3 ) of the extruded hollow profile ( 1 ) and the introduction of the fluid into the cavity ( 5 ) in the deduction area ( 17 ) he follows. Manufacturing method according to one of claims 1 to 4, characterized in that the introduction of the fluid immediately after, in particular by, the die ( 10 ) he follows. Manufacturing method according to one of claims 1 to 5, characterized in that the die ( 10 ) a die axial part ( 11 ) and a female peripheral part ( 12 ) and the introduction of the fluid through the die axial part ( 11 ) he follows. Manufacturing method according to one of claims 1 to 6, characterized in that the fluid in the form of a gas ( 21 ), in particular the formation of the inner layer ( 9 ) by means of a CVD process (Chemical Vapor Deposition). Manufacturing method according to one of claims 1 to 7, characterized in that the jacket ( 3 ) of the extruded hollow profile ( 1 ) is tempered in the context of extruding the blank and the inner layer ( 9 ) on the still-tempered jacket ( 3 ) is formed. Manufacturing method according to one of claims 1 to 8, characterized in that the inner layer ( 9 ) under reaction of the fluid at one of the cavities ( 5 ) facing inside ( 7 ) of the jacket ( 3 ) is formed. Extruder for an extruded hollow profile ( 1 ), in particular for an extruded tube, which extruded hollow profile ( 1 ): a jacket ( 3 ) and a cavity ( 5 ) and where the jacket ( 3 ) with at least one cavity ( 5 ) facing inner layer ( 9 ), and wherein the extruder comprises: a die ( 10 ), a recording ( 15 ) for a blank and a withdrawal area ( 17 ) for the coat ( 3 ) of the extruded hollow profile ( 1 ), further characterized by a in the deduction area ( 17 ) opening fluid supply for a for the formation of the inner layer ( 9 ) suitable fluid. Die ( 10 ) for an extruder, for an extruded hollow profile ( 1 ), in particular for an extruded tube, which extruded hollow profile ( 1 ): a jacket ( 3 ) and a cavity ( 5 ) and where the jacket ( 3 ) with at least one cavity ( 5 ) facing inner layer ( 9 ), and wherein the die ( 10 ): a receptacle ( 15 ) for a blank and a withdrawal area ( 17 ) for the coat ( 3 ) of the extruded hollow profile ( 1 ), further characterized by a in the deduction area ( 17 ) opening fluid supply for a for the formation of the inner layer ( 9 ) suitable fluid. Die ( 10 ) according to claim 10, characterized in that a die axial part ( 11 ) and a female peripheral part ( 12 ) is provided and the fluid supply in the die axial part ( 11 ) is arranged. Extruded hollow section ( 1 ), in particular extruded tube ( 1 ), preferably of metal, such as. Aluminum or an aluminum alloy, comprising: a jacket ( 3 ) and a cavity ( 5 ) and where the jacket ( 3 ) with at least one cavity ( 5 ) facing inner layer ( 9 ), wherein the inner layer ( 9 ) during extrusion of the extruded hollow profile ( 1 ) is formed, in particular according to a manufacturing method according to any one of claims 1 to 9. Extruded hollow section ( 1 ) according to claim 13, characterized in that the inner layer ( 9 ) is formed continuously and uniformly, in particular a CVD inner layer ( 9 ). Heat exchanger with an extruded hollow profile ( 1 ) according to claim 13 or 14.