WO2005021819A2 - Procede d'application d'un revetement sur une piece metallique - Google Patents

Procede d'application d'un revetement sur une piece metallique Download PDF

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Publication number
WO2005021819A2
WO2005021819A2 PCT/EP2004/009194 EP2004009194W WO2005021819A2 WO 2005021819 A2 WO2005021819 A2 WO 2005021819A2 EP 2004009194 W EP2004009194 W EP 2004009194W WO 2005021819 A2 WO2005021819 A2 WO 2005021819A2
Authority
WO
WIPO (PCT)
Prior art keywords
mold release
release agent
mold
organic
component
Prior art date
Application number
PCT/EP2004/009194
Other languages
German (de)
English (en)
Other versions
WO2005021819A3 (fr
Inventor
Andreas Barth
Marita Bauer
Original Assignee
Daimlerchrysler Ag
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Daimlerchrysler Ag filed Critical Daimlerchrysler Ag
Publication of WO2005021819A2 publication Critical patent/WO2005021819A2/fr
Publication of WO2005021819A3 publication Critical patent/WO2005021819A3/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C24/00—Coating starting from inorganic powder
    • C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/24—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means incorporating means for heating the liquid or other fluent material, e.g. electrically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
    • B29C33/58—Applying the releasing agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
    • B29C33/60—Releasing, lubricating or separating agents
    • B29C33/62—Releasing, lubricating or separating agents based on polymers or oligomers
    • B29C33/64—Silicone
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00

Definitions

  • the invention relates to a method for coating a metallic component with a corrosion protection layer according to the preamble of claim 1.
  • light metal components e.g. made of aluminum or magnesium.
  • the components are usually cast, forged, extruded or extruded.
  • the metals mentioned and their alloy form a passivation layer on the surface, which protects them well against corrosion under normal climatic conditions.
  • these metals are attacked to an unacceptable degree.
  • WO 01/92600 AI describes a method in which a highly concentrated mold release agent, which comprises various organic constituents, including waxes, is sprayed onto a metallic mold, the highly concentrated burns the mold release agent into the surface of the component shown during a molding process.
  • a concentrated mold release agent which is at least 0.3% correct contains ganic mold release agents, sprayed onto a metal mold.
  • the surface of the metallic mold is at least partially covered with the mold release agent.
  • a component is formed in the molding tool. This can be done, for example, by a casting process or by an unmolding process.
  • the concentrated mold release agent is burned into a surface of the component. After the component has solidified and cooled, the burned-in mold release agent acts in part as a corrosion protection layer.
  • the process according to the invention is distinguished from the prior art in that the mold release agent is heated to a temperature between 40 ° C. and 99 ° C. before being sprayed on. Preheating the mold release agent lowers its viscosity, which means that a more even mold release agent distribution can be achieved, especially in difficult-to-access tool zones. In these difficult to access tool zones, the measure according to the invention improves the corrosion protection by the baked wax, which in turn means that the concentration of mold release agents can be reduced.
  • a corrosion-inhibiting effect can be demonstrated by a surface layer on the component.
  • the clogging of spray nozzles is reduced and the surface quality of the components is improved.
  • a spray head is used to spray the mold release agent and the mold release agent is heated to a temperature between 40 ° C. and 99 ° C. as it passes through the spray head.
  • the mold release agent is thus only heated shortly before being sprayed onto the mold, which prevents decomposition of organic constituents or the emulsifiers in the release agent. This measure also saves energy costs because a heated mold release agent does not have to be transported over longer distances.
  • the spray head can be heated by various methods.
  • Advantageous heating methods include inductive heating, electrical heating, for example by means of a heating coil, or the heating of the spray head by means of heat exchange devices.
  • Heat exchange devices can be configured, for example, by gaseous or liquid heating means.
  • the molding tool may be sprayed with preheated water, which is also heated in a temperature range between 40 ° C. and 99 ° C., after a component has been removed from the mold and before being sprayed with the mold release agent.
  • This treatment with preheated water acts as cooling of the mold, which can be locally heated up to 500 ° C after a molding process.
  • This cooling measure reduces the thermal shock of the mold.
  • the set temperature of the preheated water also prevents the surface of the mold from falling below a minimum temperature, which would be possible, for example, if the cycle was interrupted for a long time. This measure also avoids that components on contours of the form Shrink on the tool, which would result in poor demolding of the component.
  • the mold release agent usually consists of an emulsion of water or oil and organic mold release agents.
  • Conventional mold release agents contain less than 0.3% of organic mold release agents when used in production or after appropriate water dilution.
  • the corrosion-inhibiting effect of the mold release agent begins when the proportion of organic mold release agent active ingredients is greater than 0.3%.
  • the desired proportion of active ingredient in the mold release agent depends on the corrosion resistance of the alloy. For the corrosion-prone Mg alloy AS 21 HP, a minimum active ingredient content of 14% to 16% is advisable, while for the more corrosion-resistant Mg alloy AS 31 HP, an active ingredient content greater than 0.5% is sufficient.
  • the proportion of organic mold release agent substances does not exceed 25%.
  • undiluted active mold release agents that are applied to the mold can achieve the corrosion-inhibiting effect according to the invention on the component.
  • undiluted active mold release agents are difficult to distribute and spray on the mold.
  • a concentration of 0.5 to 20% of organic mold release agents is particularly advantageous. Also advantageous is a concentration between 5 and 15% of organic mold release agents.
  • the concentration of mold release agents depends on the one hand on the corrosion loads to which the material is exposed, on the other hand the material itself is decisive for that applied concentration.
  • the organic mold release agents usually include a mixture of polysiloxanes, waxes (polyethylenes, paraffins, olefins, fatty alcohols, natural waxes, etc.) and sometimes. Synthetic oils.
  • waxes polyethylenes, paraffins, olefins, fatty alcohols, natural waxes, etc.
  • Synthetic oils A particularly good effect according to the invention has been found if the mold release agents contain between 2% and 50% of waxes and / or polysiloxanes. In particular, a wax content of between 6% and 35% in the mold release agent is particularly advantageous.
  • FIG. 1 shows a schematic structure for spraying a mold with mold release agents
  • Fig. 2 is a schematic representation of a heated spray head.
  • a corresponding casting tool 7 (a tool half is shown) with a nem concentrated mold release agent 15, which consists of 90% water and 14.9% of an organic mold release agent, sprayed area-wide.
  • a spray head 2 is used, which comprises a spray nozzle 4 and is moved by a positioning device 6 (not shown in more detail), which can be designed, for example, in the form of a robot arm.
  • the spray head 2 is connected via a line 11 to a container 13 in which the mold release agent 15 is kept.
  • the mold release agent 15 is fed to the spray head 2 under pressure via the line 11.
  • the mold release agent 15 is heated in the spray head 2 and sprayed into the mold cavity 9 of the mold 7.
  • FIG. 2 shows a schematic representation of the spray head 2, the spray head 2 comprising heating with a heating coil 17, by means of which the mold release agent 15, which is fed through the line 11 into the spray head 2, is heated to a temperature of approximately 70 ° C. is heated.
  • the mold release agent 15 emerges through the spray nozzle 4 of the spray head 2 and, as shown in FIG. 1, is sprayed into the mold cavity 9 of the mold 7.
  • the surface of the mold cavity 9 is coated with the mold release agent 15 in a particularly uniform manner.
  • the surface of the mold cavity 9 usually already has a temperature of approximately 300 ° C.
  • the water in the mold release agent has largely evaporated and the organic mold release agent is fixed on the surface.
  • the mold cavity 9 of the mold 7 is then filled with a molten magnesium alloy, which has a temperature of 700 ° C., under pressure.
  • the mold release agent active on the surface of the mold cavity 9 is prevented from wetting the surface by the magnesium melt during filling. In this process phase there is almost no interaction between the melt and the mold release agent.
  • the magnesium melt solidifies into a component. The solidification process takes approx. 15 s.
  • the mold release agent used mainly consists of polysiloxanes, wax and synthetic oils.
  • the wax is essentially responsible for the burning into the surface of the component.
  • the wax of the mold release agent ultimately also leads to the corrosion-inhibiting effect according to the invention and to the surface protection.
  • the mold release agent used has a wax concentration of 30%.
  • the mold release agent 15 is heated in the spray head 2 by an electric heating coil. In principle, however, all heating methods are conceivable in the spray head, which ensure rapid heating of the mold release agent 15 during the passage through the spray head 2. Heat exchange processes, e.g. by a liquid heating medium or an inductive heating process by an induction coil. However, it should be pointed out that it is advantageous if the mold release agent 15 is heated directly in the spray head 2, shortly before the mold release agent 15 emerges from the spray nozzle 4. The mold release agent is thus kept at this elevated temperature for only a very short time, as a result of which possible decomposition of various active ingredients of the mold release agent active ingredient is prevented.
  • the mold release agent usually consists of water and mold release agent. In individual cases, however, it may be expedient to add other functional substances than those which have already been mentioned, for example also inorganic substances, to the mold release agent.
  • the spray head has a plurality of individual nozzles, not shown here, which can be heated separately.
  • the flow rate of the individual nozzles can be regulated individually, and the temperature of the sprayed mold release agent can be changed very quickly by specifically controlling the flow rate of the individual nozzles. This has the advantage that colder areas of the mold 7 can be sprayed with hotter mold release agent and vice versa. This can reduce thermal stresses in the mold.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Casting Devices For Molds (AREA)
  • Mold Materials And Core Materials (AREA)
  • Coating By Spraying Or Casting (AREA)

Abstract

Procédé d'application d'une couche de protection contre la corrosion sur une pièce métallique. A cet effet, un outil de formage métallique (7) est recouvert au moins en partie d'un agent de démoulage concentré (15) appliqué par pulvérisation. La pièce est formée dans l'outil de formage métallique (7). Pendant que la pièce durcit, l'agent de démoulage concentré brûle en pénétrant dans la surface de la pièce et forme ainsi une couche de protection contre la corrosion. La présente invention se caractérise en ce que l'agent de démoulage (15) est chauffé à une température située entre 40 °C et 99 °C, avant d'être pulvérisé sur l'outil de formage.
PCT/EP2004/009194 2003-08-22 2004-08-17 Procede d'application d'un revetement sur une piece metallique WO2005021819A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2003138570 DE10338570B4 (de) 2003-08-22 2003-08-22 Verfahren zur Beschichtung eines metallischen Bauteils
DE10338570.3 2003-08-22

Publications (2)

Publication Number Publication Date
WO2005021819A2 true WO2005021819A2 (fr) 2005-03-10
WO2005021819A3 WO2005021819A3 (fr) 2005-06-30

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PCT/EP2004/009194 WO2005021819A2 (fr) 2003-08-22 2004-08-17 Procede d'application d'un revetement sur une piece metallique

Country Status (2)

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DE (1) DE10338570B4 (fr)
WO (1) WO2005021819A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022006273A1 (fr) * 2020-06-30 2022-01-06 Canon Virginia, Inc. Procédés et systèmes de distribution de cire de pulvérisation et d'extrusions de bande de rupture

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019118661A1 (de) * 2019-07-10 2021-01-14 Bayerische Motoren Werke Aktiengesellschaft Applikationskopf zur Heißapplikation von Wachs sowie Verfahren zum Applizieren von Wachs

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001092600A1 (fr) * 2000-05-26 2001-12-06 Daimlerchrysler Ag Procede permettant de revetir un composant metallique
JP2003205346A (ja) * 2002-01-11 2003-07-22 Hanano Shoji Kk 金型冷却方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60203335A (ja) * 1984-03-26 1985-10-14 Honda Motor Co Ltd 離型剤の塗布方法
US4882107A (en) * 1988-11-23 1989-11-21 Union Carbide Chemicals And Plastics Company Inc. Mold release coating process and apparatus using a supercritical fluid

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001092600A1 (fr) * 2000-05-26 2001-12-06 Daimlerchrysler Ag Procede permettant de revetir un composant metallique
JP2003205346A (ja) * 2002-01-11 2003-07-22 Hanano Shoji Kk 金型冷却方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN Bd. 010, Nr. 055 (M-458), 5. März 1986 (1986-03-05) & JP 60 203335 A (HONDA GIKEN KOGYO KK), 14. Oktober 1985 (1985-10-14) & DATABASE WPI Section Ch, Week 198547 Derwent Publications Ltd., London, GB; Class M22, AN 1985-293826 & JP 60 203335 A (HONDA MOTOR IND CO LTD) 14. Oktober 1985 (1985-10-14) *
PATENT ABSTRACTS OF JAPAN Bd. 2003, Nr. 11, 5. November 2003 (2003-11-05) & JP 2003 205346 A (HANANO SHOJI KK), 22. Juli 2003 (2003-07-22) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022006273A1 (fr) * 2020-06-30 2022-01-06 Canon Virginia, Inc. Procédés et systèmes de distribution de cire de pulvérisation et d'extrusions de bande de rupture

Also Published As

Publication number Publication date
DE10338570A1 (de) 2005-03-24
DE10338570B4 (de) 2005-07-14
WO2005021819A3 (fr) 2005-06-30

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