EP0439670A1 - Pretreatment method for metal sheets - Google Patents
Pretreatment method for metal sheets Download PDFInfo
- Publication number
- EP0439670A1 EP0439670A1 EP90110252A EP90110252A EP0439670A1 EP 0439670 A1 EP0439670 A1 EP 0439670A1 EP 90110252 A EP90110252 A EP 90110252A EP 90110252 A EP90110252 A EP 90110252A EP 0439670 A1 EP0439670 A1 EP 0439670A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- powder
- sheet metal
- sheet
- metal parts
- coating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/201—Work-pieces; preparation of the work-pieces, e.g. lubricating, coating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2401/00—Form of the coating product, e.g. solution, water dispersion, powders or the like
- B05D2401/30—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant
- B05D2401/32—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant applied as powders
Definitions
- the invention relates to a method for pretreating sheet metal in the form of sheet metal parts or strip material wound up as a sheet coil before the mechanical deformation process. Furthermore, an installation for carrying out the method is provided.
- the invention has for its object to avoid the disadvantages described above and to provide a method for the pretreatment of sheet metal, which is inexpensive and easy to carry out and is particularly environmentally friendly.
- the measure according to the invention has the advantage that an effective protective or sliding layer can be applied to sheet metal material in a cost-effective manner, which functions in the subsequent deformation process as a sliding and pulling aid, does not form any disruptive residues on the sheet and is therefore environmentally friendly overall Treatment is created.
- the material used for the application of the sliding or protective layer can be branched off from the powder circuit of a powder coating system as a reusable waste product. There the so-called very fine powder is produced in not inconsiderable quantities, which is no longer qualitatively suitable for the actual coating process, but which is still completely sufficient for the process according to the invention.
- Further advantages of the sliding coating are that sensitive surfaces are protected during transport and processing, that deformation tools are protected from rapid wear and that, for. B. in stainless steels or similar sensitive surfaces the use of protective films can be avoided.
- Sheet material in the form of flat individual parts or in the form of strip material, which is generally wound on sheet metal coils, can be used as the material for the sliding or protective layer.
- the sheet can be coated with powder on one or both sides. It is usually completely sufficient if the sheet is only provided in a small layer thickness or with a powder layer that does not cover the entire surface. This can be done by a punctiform, strip-shaped or wavy powder application. It is also possible to apply the sliding or protective layer by switching on the spray guns of a suitable coating system for a short period of time.
- the method according to the invention is of course suitable for the use of sheet metal which is subsequently treated in a powder coating system.
- a type of sliding grain layer can remain on the sheet, which then disappears under the opaque powder coating without disruptive effects, but surprisingly also with other types of coating, such as painting or the like, can remain under the top layer without problems.
- part of a powder coating system for flat sheet metal parts that can be transported lying through the system is shown in detail, namely the part in which the powder application serving as a sliding aid takes place.
- the flat sheet metal parts (2) are provided with their final coating after their pretreatment (not shown in detail) and in a powder coating station (15) (not shown in detail).
- This powder coating station (15) is now followed by a further coating station (21), which, however, can have a much simpler structure.
- four spray guns (22) are provided under the transport device (3), which are arranged in such a way that the coated sheet metal parts (2) can be provided with a powder application on their rear side.
- the transport device should be designed so that the rear of the sheet metal parts (2) are freely accessible for the spray jet of the spray guns (22).
- this powder application only serves as a sliding aid for the subsequent shaping process, a powder layer with a small layer thickness, a powder layer that does not cover the entire surface, or even a powder application that is applied in a punctiform or strip-like manner is sufficient. Even a hint of powder can be enough to get the desired sliding effect in the tool. This can be done by one or, as shown, several spray guns take place, which may only be switched on for a short time.
- the coating station (21) is provided with rollers (23) and can therefore be used as a changing booth.
- a powder recovery device (24) is arranged underneath the spray guns (22), in which the non-adhering powder is collected and from here is returned to the spray guns (22) in a circuit.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren zur Vorbehandlung von Blech in Form von Blechteilen oder als Blechcoil aufgewickeltes Bandmaterial vor dem mechanischen Verformungsprozeß. Weiterhin wird eine Anlage zur Durchführung des Verfahrens agegeben.The invention relates to a method for pretreating sheet metal in the form of sheet metal parts or strip material wound up as a sheet coil before the mechanical deformation process. Furthermore, an installation for carrying out the method is provided.
In der allgemeinen Blechverarbeitung zur Herstellung von Blechteilen oder Gerätegehäusen aus Blech ist es bekannt, als sogenannte Gleit- bzw. Ziehhilfsmittel Fette, öle, Folien oder dgl. einzusetzen.In general sheet metal processing for the production of sheet metal parts or device housings from sheet metal, it is known to use fats, oils, foils or the like as so-called sliding or drawing aids.
Der Nachteil dieser Behandlungsmethode besteht darin, daß diese Schutzmittel hinterher wieder chemisch oder mechanisch vom Blechteil entfernt werden müssen, so daß zusätzlich hohe Kosten anfallen und aufwendige sowie zum Teil umweltbelastende Verfahren eingesetzt werden müssen.The disadvantage of this treatment method is that these protective agents have to be removed chemically or mechanically from the sheet metal part afterwards, so that additional costs are incurred and complex and sometimes environmentally harmful processes have to be used.
Bei der Verarbeitung von vorbehandelten, z. B. verzinkten Blechen oder Galfanblechen entsteht in den Verformungsstationen ein Abrieb, der sich an den Werkzeugen festsetzen kann. Dieser Abrieb führt dann mehr oder weniger zu einer Klumpen- bzw. Körnerbildung, durch die dann an den zu verformenden Teilen Buckel oder kleine Beulen entstehen. Die Folge sind Oberflächenfehler, die die weitere Verwendung dieser Blechteile ausschließen.When processing pretreated, e.g. B. galvanized sheets or Galfan sheets, an abrasion occurs in the deformation stations, which can stick to the tools. This abrasion then more or less leads to the formation of lumps or grains, which then cause humps or small bumps on the parts to be deformed. The result is surface defects that prevent further use of these sheet metal parts.
In der Autoindustrie ist ein ähnliches Problem ebenfalls bei verzinkten Blechen bekannt. Deshalb wird das Blech vor der Beschichtung mit einem sogenannten Gleitprimer versehen. Eine im Naßlackierungsverfahren aufgetragene, dünne Lackschicht auf dem Blechteil bewirkt, daß die Blechteile im Verformungsprozeß besser gleiten können und an den Werkzeugen keinen störenden Abrieb mehr verursachen. Die mit einem Lackprimer vorbehandelten Bleche sind jedoch relativ teuer und die meistens ein Lösungsmittel enthaltenen Lackprimer sind nicht besonders umweltverträglich. Weiterhin sind diese Bleche für einen Pulverauftrag nicht sonderlich gut geeignet.A similar problem is also known in the automotive industry with galvanized sheets. That is why the sheet is coated with a so-called sliding primer before coating. A thin layer of lacquer applied to the sheet metal part in the wet painting process has the effect that the sheet metal parts can slide better in the deformation process and no longer cause annoying abrasion on the tools. However, the sheets pretreated with a paint primer are relatively expensive and the paint primers, which mostly contain a solvent, are not particularly environmentally friendly. Furthermore, these sheets are not particularly suitable for powder application.
Der Erfindung liegt die Aufgabe zugrunde, die vorstehend beschriebenen Nachteile zu vermeiden und ein Verfahren zur Vorbehandlung von Blech zu schaffen, welches preiswert und einfach ausführbar sowie in besonderer Weise umweltverträglich ist.The invention has for its object to avoid the disadvantages described above and to provide a method for the pretreatment of sheet metal, which is inexpensive and easy to carry out and is particularly environmentally friendly.
Die Lösung dieser Aufgabe wird durch ein Verfahren gemäß Anspruch 1 erzielt. Zweckmäßige Ausgestaltungen und Weiterbildungen des Verfahrens ergeben sich aus den nachfolgenden Unteransprüchen.This object is achieved by a method according to
Durch die erfindungsgemäße Maßnahme wird der Vorteil erzielt, daß man in kostengünstiger Weise eine wirksame Schutz- oder Gleitschicht auf Blechmaterial aufbringen kann, die im nachfolgenden Verformungsprozeß ihre Funktion als Gleit- und Ziehhilfe ausübt, auf dem Blech keine störenden Rückstände bildet und wodurch insgesamt eine umweltverträgliche Behandlungsweise geschaffen wird. Das hierfür verwendete Material zum Auftrag der Gleit- bzw. Schutzschicht kann aus dem Pulverkreislauf einer Pulverbeschichtungsanlage als wiederverwendbares Abfallprodukt abgezweigt werden. Dort entsteht in nicht unbeträchtlichen Mengen das sogenannte Feinstpulver, welches für den eigentlichen Beschichtungsprozeß qualitativ nicht mehr geeignet ist, welches aber für das erfindungsgemäße Verfahren noch vollkommen ausreichend ist. Weitere Vorteile der Gleitbeschichtung sind, daß empfindliche Oberflächen beim Transport und bei der Verarbeitung geschützt werden, daß Verformungswerkzeuge vor schnellem Verschleiß bewahrt werden und daß z. B. bei Edelstählen oder ähnlichen sensiblen Oberflächen die Verwendung von Schutzfolien unterbleiben kann.The measure according to the invention has the advantage that an effective protective or sliding layer can be applied to sheet metal material in a cost-effective manner, which functions in the subsequent deformation process as a sliding and pulling aid, does not form any disruptive residues on the sheet and is therefore environmentally friendly overall Treatment is created. The material used for the application of the sliding or protective layer can be branched off from the powder circuit of a powder coating system as a reusable waste product. There the so-called very fine powder is produced in not inconsiderable quantities, which is no longer qualitatively suitable for the actual coating process, but which is still completely sufficient for the process according to the invention. Further advantages of the sliding coating are that sensitive surfaces are protected during transport and processing, that deformation tools are protected from rapid wear and that, for. B. in stainless steels or similar sensitive surfaces the use of protective films can be avoided.
Als Material für die Gleit- bzw. Schutzschicht kommt Blech in Form flacher Einzelteile oder in Form von Bandmaterial, welches in der Regel auf Blechcoils aufgewickelt ist, in Frage. Je nach weiterer Verwendungsweise und der Notwendigkeit kann das Blech ein- oder beidseitig mit dem entsprechenden Pulverauftrag versehen werden. Es reicht meist vollkommen aus, wenn das Blech nur in einer geringen Schichtdicke oder mit einer nicht vollflächig deckenden Pulverschicht versehen wird. Dies kann durch einen punktuellen, streifenförmigen oder in Wellenlinienform ausgebildeten Pulverauftrag erfolgen. Es ist ebenfalls möglich, die Gleit- bzw. Schutzschicht durch kurzzeitiges und taktweise vorgesehenes Einschalten der Spritzpistolen einer geeigneten Beschichtungsanlage vorzunehmen.Sheet material in the form of flat individual parts or in the form of strip material, which is generally wound on sheet metal coils, can be used as the material for the sliding or protective layer. Depending on the further use and the need, the sheet can be coated with powder on one or both sides. It is usually completely sufficient if the sheet is only provided in a small layer thickness or with a powder layer that does not cover the entire surface. This can be done by a punctiform, strip-shaped or wavy powder application. It is also possible to apply the sliding or protective layer by switching on the spray guns of a suitable coating system for a short period of time.
Insbesondere eignet sich das erfindungsgemäße Verfahren natürlich für den Einsatz von Blech, welches hinterher in einer Pulverbeschichtungsanlage behandelt wird. Es hat sich hierbei jedenfalls gezeigt, daß eine Art Gleitkörnungsschicht auf dem Blech verbleiben kann, die dann hinterher ohne störende Effekte unter der deckenden Pulverbeschichtung verschwindet, aber überraschenderweise auch bei anderen Beschichtungsarten, wie Lackieren oder dgl., unter der Deckschicht ohne Probleme verbleiben kann.In particular, the method according to the invention is of course suitable for the use of sheet metal which is subsequently treated in a powder coating system. In any case, it has been shown that a type of sliding grain layer can remain on the sheet, which then disappears under the opaque powder coating without disruptive effects, but surprisingly also with other types of coating, such as painting or the like, can remain under the top layer without problems.
Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen dargestellt und wird nachstehend näher beschrieben und erläutert. Es zeigen:
Figur 1- den Teil einer Pulverbeschichtungsanlage für flache Blechteile von der Seite im Schnitt, in dem der Gleitschichtauftrag erfolgt,
Figur 2- den Teil der Pulverbeschichtungsanlage gemäß Fig. 1 in der Vorderansicht.
- Figure 1
- the section of a powder coating system for flat sheet metal parts from the side in which the sliding layer is applied,
- Figure 2
- the part of the powder coating system according to FIG. 1 in the front view.
In den Zeichnungen ist ausschnittsweise der Teil einer Pulverbeschichtungsanlage für flache, liegend durch die Anlage transportierbare Blechteile dargestellt und zwar der Teil, in dem der als Gleithilfe dienende Pulverauftrag erfolgt. Die flachen Blechteile (2) werden nach ihrer nicht näher gezeigten Vorbehandlung und in einer nicht im Detail dargestellten Pulverbeschichtungsstation (15) mit ihrer Endbeschichtung versehen.In the drawings, part of a powder coating system for flat sheet metal parts that can be transported lying through the system is shown in detail, namely the part in which the powder application serving as a sliding aid takes place. The flat sheet metal parts (2) are provided with their final coating after their pretreatment (not shown in detail) and in a powder coating station (15) (not shown in detail).
Dieser Pulverbeschichtungsstation (15) wird nun eine weitere Beschichtungsstation (21) nachgeschaltet, die aber einen wesentlich einfacheren Aufbau haben kann. In der gezeigten Ausführung sind vier Spritzpistolen (22) unter der Transportvorrichtung (3) vorgesehen, die derart angeordnet sind, daß die beschichteten Blechteile (2) auf ihrer Rückseite mit einem Pulverauftrag versehen werden können. Hierbei ist die Transportvorrichtung möglichst so zu gestalten, daß die Rückseiten der Blechteile (2) für den Sprühstrahl der Spritzpistolen (22) frei zugänglich sind.This powder coating station (15) is now followed by a further coating station (21), which, however, can have a much simpler structure. In the embodiment shown, four spray guns (22) are provided under the transport device (3), which are arranged in such a way that the coated sheet metal parts (2) can be provided with a powder application on their rear side. The transport device should be designed so that the rear of the sheet metal parts (2) are freely accessible for the spray jet of the spray guns (22).
Da dieser Pulverauftrag nur als Gleithilfe für den nachfolgenden Verformungsprozeß dient, genügt schon eine Pulverschicht mit geringer Schichtdicke, eine nicht vollflächig deckende Pulverschicht oder sogar nur ein punktuell oder streifenförmig angelegter Pulverauftrag. Selbst ein Hauch von Pulver kann schon ausreichen, um den gewünschten Gleiteffekt im Werkzeug zu erhalten. Dies kann schon durch eine oder auch, wie gezeigt, mehrere Spritzpistolen erfolgen, die eventuell nur kurzzeitig eingeschaltet werden.Since this powder application only serves as a sliding aid for the subsequent shaping process, a powder layer with a small layer thickness, a powder layer that does not cover the entire surface, or even a powder application that is applied in a punctiform or strip-like manner is sufficient. Even a hint of powder can be enough to get the desired sliding effect in the tool. This can be done by one or, as shown, several spray guns take place, which may only be switched on for a short time.
Da an die Qualität des Pulverauftrags keine hohen Ansprüche gestellt werden, dürfte es auch vollkommen ausreichen, wenn das aus der vorhergehenden Pulverbeschichtungsstation (15) abziehbare Feinstpulver verwendet wird.Since no high demands are placed on the quality of the powder application, it should also be entirely sufficient if the fine powder that can be removed from the previous powder coating station (15) is used.
Die Beschichtungsstation (21) ist mit Rollen (23) versehen und kann somit als Wechselkabine benutzt werden. Unterhalb der Spritzpistolen (22) ist eine Pulverrückgewinnungseinrichtung (24) angeordnet, in der das nicht haftende Pulver aufgefangen wird und von hier im Kreislauf wieder den Spritzpistolen (22) zugeführt wird.The coating station (21) is provided with rollers (23) and can therefore be used as a changing booth. A powder recovery device (24) is arranged underneath the spray guns (22), in which the non-adhering powder is collected and from here is returned to the spray guns (22) in a circuit.
Claims (6)
dadurch gekennzeichnet,
daß das Blech bzw. die Blechteile ein- oder beidseitig mit einem Pulverauftrag versehen werden, der als Gleithilfe für den nachfolgenden Verformungsprozeß dient.Process for the pretreatment of sheet metal in the form of sheet metal parts or strip material wound up as a sheet coil before the mechanical deformation process,
characterized,
that the sheet metal or the sheet metal parts are provided on one or both sides with a powder application, which serves as a sliding aid for the subsequent deformation process.
dadurch gekennzeichnet,
daß der Pulverauftrag mit einer geringen Schichtdicke oder mit einer nicht vollflächig deckenden Pulverschicht auf das Blech erfolgt.Method according to claim 1,
characterized,
that the powder is applied to the sheet with a small layer thickness or with a powder layer that does not cover the entire surface.
dadurch gekennzeichnet,
daß der Pulverauftrag punktuell, streifenförmig oder in Form von Wellenlinien vorgenommen wird.Method according to claim 1 or 2,
characterized,
that the powder is applied in spots, strips or in the form of wavy lines.
dadurch gekennzeichnet,
daß der Pulverauftrag durch kurzzeitiges Einschalten der Spritzpistolen einer Beschichtungsanlage erfolgt.Method according to one of the preceding claims,
characterized,
that the powder is applied by briefly switching on the spray guns of a coating system.
dadurch gekennzeichnet,
daß Pulvermaterial verwendet wird, welches bereits in einem Pulverbeschichtungsprozeß eingesetzt wurde und somit als Abfallprodukt abzweigbar ist.Method according to one of claims 1 to 4,
characterized,
that powder material is used which has already been used in a powder coating process and can thus be branched off as a waste product.
dadurch gekennzeichnet,
daß der Pulverbeschichtungsstation (15) für die Endbeschichtung eine weitere Beschichtungsstation (21) nachgeschaltet ist, in der ein oder mehrere Spritzpistolen (22) unterhalb der vorbeigeführten Blechteile (2) angeordnet sind, die die beschichteten Blechteile (2) auf ihrer Rückseite mit einem Pulverauftrag versehen.Plant for carrying out the method according to one of claims 1 to 5,
characterized,
that the powder coating station (15) for the final coating is followed by a further coating station (21), in which one or more spray guns (22) are arranged below the sheet metal parts (2) which pass by, the coated sheet metal parts (2) on their back with a powder application Mistake.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3942978 | 1989-12-23 | ||
| DE3942978 | 1989-12-23 | ||
| DE4013692 | 1990-04-28 | ||
| DE4013692 | 1990-04-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0439670A1 true EP0439670A1 (en) | 1991-08-07 |
Family
ID=25888525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90110252A Withdrawn EP0439670A1 (en) | 1989-12-23 | 1990-05-30 | Pretreatment method for metal sheets |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0439670A1 (en) |
| DE (1) | DE4017362A1 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0042111A1 (en) * | 1980-06-13 | 1981-12-23 | COMPAGNIE EUROPEENNE POUR L'EQUIPEMENT MENAGER "CEPEM" Société anonyme dite: | Method of and apparatus for the electrostatic powdering of objects in several different layers |
| EP0201923A2 (en) * | 1985-05-15 | 1986-11-20 | Lichtenberg & Co Chemische Fabrik Zweigniederlassung der UK-Mineralölwerke Wenzel & Weidmann GmbH, Eschweiler | Method for coating solid bodies with lubricants |
-
1990
- 1990-05-30 EP EP90110252A patent/EP0439670A1/en not_active Withdrawn
- 1990-05-30 DE DE19904017362 patent/DE4017362A1/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0042111A1 (en) * | 1980-06-13 | 1981-12-23 | COMPAGNIE EUROPEENNE POUR L'EQUIPEMENT MENAGER "CEPEM" Société anonyme dite: | Method of and apparatus for the electrostatic powdering of objects in several different layers |
| EP0201923A2 (en) * | 1985-05-15 | 1986-11-20 | Lichtenberg & Co Chemische Fabrik Zweigniederlassung der UK-Mineralölwerke Wenzel & Weidmann GmbH, Eschweiler | Method for coating solid bodies with lubricants |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN, Band 11, Nr. 166 (M-593)[2613], 28. Mai 1987; & JP-A-61 296 905 (NIPPON STEEL) 27-12-1986 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE4017362A1 (en) | 1991-06-27 |
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