EP3414020B1 - Procede destine a revetir les parois interieures d'un espace creux a l'aide d'une couche de protection anticorrosion constituee de cire ou a base de cire - Google Patents

Procede destine a revetir les parois interieures d'un espace creux a l'aide d'une couche de protection anticorrosion constituee de cire ou a base de cire Download PDF

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Publication number
EP3414020B1
EP3414020B1 EP17703199.4A EP17703199A EP3414020B1 EP 3414020 B1 EP3414020 B1 EP 3414020B1 EP 17703199 A EP17703199 A EP 17703199A EP 3414020 B1 EP3414020 B1 EP 3414020B1
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EP
European Patent Office
Prior art keywords
mist
cavity
protective agent
corrosion
wax
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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Application number
EP17703199.4A
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German (de)
English (en)
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EP3414020A1 (fr
Inventor
Bernhard Woll
Marc Engelhart
Fredy Doll
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IPR Intelligente Peripherien fuer Roboter GmbH
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IPR Intelligente Peripherien fuer Roboter GmbH
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    • 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
    • B05B13/06—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 specially designed for treating the inside of hollow bodies
    • B05B13/0627—Arrangements of nozzles or spray heads specially adapted for treating the inside of hollow bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/02—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling time, or sequence, of delivery
    • B05B12/06—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling time, or sequence, of delivery for effecting pulsating flow
    • 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
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • 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
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/10—Spray pistols; Apparatus for discharge producing a swirling discharge
    • 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
    • B05D2259/00—Applying the material to the internal surface of hollow articles other than tubes
    • 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
    • B05D2501/00—Varnish or unspecified clear coat
    • B05D2501/10—Wax
    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0218—Pretreatment, e.g. heating the substrate
    • 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
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies

Definitions

  • the invention relates to a method for covering the inner walls of a cavity of a vehicle body or an add-on part for a vehicle body with a protective layer of anti-corrosion wax or a wax-based anti-corrosion agent according to the preamble of claim 1.
  • Generic methods are used in vehicle construction in order to protect body parts and in particular cavities in body parts and their attachments such as flaps, doors and the like against environmental influences. Typically, this is done by either applying anti-corrosion wax to the surfaces in question by spraying or by flooding the cavities with anti-corrosion wax and then removing excess protective wax from the surfaces in question.
  • Spraying corrosion protection wax does not allow complex geometries to reach all surfaces of the cavity starting from an exit point of the protection wax. Beyond, for example, bulkhead sheets that apply to the reinforcement, spray shadow areas that cannot be reached can remain. Even tight geometries such as intermediate areas of double-walled designs are difficult to reach by spraying.
  • Flooding with anti-corrosive wax requires great energy and amounts of protective wax and is made more difficult by the need to remove the excess protective wax. Furthermore, improvements in cycle times when applying anti-corrosion wax by flooding are difficult to achieve.
  • a method for lining pipes of a pipeline is known.
  • a plastic mist is used here.
  • a method for reducing leakage on pipes is known, which is based on the fact that an aqueous wax dispersion is passed through the pipe and reaches the surrounding earth through damaged areas, where it seals the damaged area.
  • Another method for repairing pipes in the ground is known.
  • From the GB 867303 A is a process for lining steel tanks known.
  • the US 3488213 A discloses a method for lining beer kegs with a wax layer.
  • the object of the invention is to provide a technically uncomplicated method by means of which a reliable covering of inner surfaces of a cavity is possible with little use of protective agents.
  • Corrosion protection wax or wax-based corrosion protection agent is brought into a nebulized form (protective agent mist) by means of a mist generator and supplied to the cavity of the vehicle body or the add-on part to be preserved through an outlet opening.
  • the protective agent mist consists of air and droplets of the anti-corrosion wax or wax-based anti-corrosion agent, the mean diameter of the droplets of the supplied mist is ⁇ 60 ⁇ m and the droplets of the protective agent mist emerge from the outlet opening at a speed of ⁇ 10 m / s.
  • the protective agent mist is deposited on the inner walls of the cavity of the vehicle body or the add-on part and forms a layer of anti-corrosion agent here.
  • the corrosion protection agent used in the method according to the invention can be designed as a corrosion protection wax and as such has a wax content (mineral oil-based wax / paraffin) of at least 50% by weight.
  • wax-based corrosion protection agents with a lower wax content of at least 5% by weight and preferably between 5% by weight and 15% by weight can also be used.
  • Such corrosion protection agents can in particular also contain a proportion between 15% by weight and 30% by weight of a polyester resin. This gives the used protective layer a high degree of thermal stability after it has dried through.
  • corrosion protection agent includes both classic corrosion protection wax with a high wax content and corrosion protection agent with a lower wax content.
  • a fog atmosphere of corrosion protection agent and gas is generated within the cavity or such a fog atmosphere is supplied to the cavity becomes.
  • This consists of gas, especially air, and the finest droplets of the anti-corrosion agent. These are atomized small enough to be able to float in the surrounding air.
  • the average droplet size of the droplets of the corrosion protection agent in the mist is ⁇ 60 ⁇ m, in particular preferably ⁇ 30 ⁇ m or even ⁇ 10 ⁇ m on average.
  • a protective agent mist is generated by means of a suitable mist generator.
  • This can be a single-substance nozzle, for example, to which the corrosion agent is supplied at high pressures. This is explained in more detail below. Compared to the single-substance nozzle, which is operated at high pressures, a two-substance nozzle is considered to be advantageous, since very small droplets can also be generated at lower pressures.
  • fog is also known as an undesirable side effect of wax spraying, as can be seen, for example, in DE 102009052089 A1 .
  • the discharge process is preferably of such a type, in particular by the choice of the nozzle used and the pressure under which the anti-corrosion agent and possibly compressed air is supplied, that at least 50%, preferably at least 80%, of the droplets produced have a size of around does not deviate more than 20% from the mean droplet size mentioned.
  • the fog atmosphere of the protective agent mist which according to the invention is introduced into the cavity for the purpose of surface coating, largely does not directly affect the walls of the cavity, unlike when spraying the anti-corrosion agent, but initially distributes itself in the cavity and then also deposits surfaces that would not be directly accessible by spraying from the outlet opening.
  • the size of the droplets and the exit velocity and, if appropriate, also the influence on the mist formed should preferably be selected in order to generate this mist atmosphere such that at least 50% of the volume flow of the protective agent introduced takes 5 seconds or more until the droplets have deposited on the walls.
  • the foggy atmosphere therefore has time to be largely homogeneously distributed in the cavity.
  • the type of precipitation of the protective agent and the layer formation can be influenced by targeted heating or cooling of the walls of the cavity. Furthermore, it is also possible to influence the precipitation by electrostatically charging the protective agent before or during the discharge and / or charging of the walls.
  • the solidification can be brought about by an elevated temperature and a reduced temperature of the protective agent.
  • chemical drying, radiation drying or drying by air flow is also possible.
  • the protective agent mist can remain in the cavity at the end of the process or can be extracted from it.
  • the types of wax that are usually used today for spraying or flooding the cavities in vehicles are suitable as corrosion protection agents.
  • the anti-corrosion wax with the brand name Eftec Efcoat WH 320 A1 is just one example, which can be used here.
  • Other corrosion protection agents mentioned by way of example, which can be removed by means of the method according to the invention, are the corrosion protection agents available under the brand names Anticorit CPX 3373 LV and Anticorit DS 329 DE.
  • Anticorit CPX 3373 is a wax-based corrosion protection agent with a wax content of approximately 5 to 15% by weight and a polyester resin as an additive with a content between 15% and 30% by weight.
  • Such wax-based corrosion protection agents have proven to be particularly suitable for atomization.
  • Such an anti-corrosion agent preferably further comprises a filler, in particular with a proportion between 15% by weight and 25% by weight and / or additives such as anti-corrosion additives with a proportion from 10% by weight to 20% by weight.
  • the viscosity of the corrosion protection agent used is preferably below 750 mPas, particularly preferably below 600 mPas. Such low-viscosity corrosion protection agents have proven to be advantageous in order to generate the desired protective agent mist.
  • the droplets of the protective agent mist emerge from the outlet opening at a speed of ⁇ 10 m / s, in particular ⁇ 5 m / s, preferably 2 ⁇ m / s, particularly preferably ⁇ 0.5 m / s.
  • the velocity of the droplets being discharged is not completely uniform.
  • the two-substance nozzles that are preferably used for the generation of mist for example a Miniquest nozzle from Düsen-Schlick GmbH from Untersiemau / Coburg, produce droplets of different speeds. Usually, the speed is highest in a center of the cloud of nascent.
  • the speed values given above do not take these particularly fast droplets into account. They relate to the 80% of the volume flow that is generated by the slowest droplets.
  • a gas is supplied to the cavity at a different second introduction point in order to influence the direction of the flow of the protective agent mist in the cavity and / or the speed of the protective agent mist to reduce.
  • This gas which can in particular be air, is preferably supplied through a second opening in the walls of the cavity, this opening being particularly preferably arranged at a location of the cavity opposite the mist generator.
  • the supply of gas serves in particular the purpose of producing a type of gas or air cushion which is able to prevent droplets of the protective agent mist from directly hitting one of the walls of the cavity.
  • a counter pressure that counteracts the spreading of the droplets is generated, by means of which the droplets are braked so that they become part of a foggy atmosphere.
  • a particularly low volume flow becomes the cavity regarded as particularly advantageous, in particular a volume flow of the corrosion protection agent of less than 200 g / minute, preferably less than 100 g / minute, particularly preferably less than 50 g / minute.
  • the protective agent mist can be supplied at several points or at different points within the cavity to be preserved.
  • the protective agent mist can also be supplied by means of a plurality of mist generators which are arranged at different points within the cavity to be preserved and / or are arranged in different directions relative to the cavity to be preserved.
  • the fog atmosphere can be created from both ends by means of several outlet openings, which are arranged, for example, at opposite ends of an elongated cavity.
  • an outlet opening which is movable within the cavity and discharges at different points, a very homogeneous fog atmosphere can be created with only one outlet opening.
  • a plurality of outlet openings which point in different directions, particularly in conjunction with a joint movement of these outlet openings through the cavity, it can be ensured particularly well that the foggy atmosphere also reaches surface areas which are difficult to access.
  • Protective agent mist can be supplied via several mist generators, for example by using a two-substance nozzle in combination with the above-mentioned supply of gas. By introducing protective agent mist through two approximately oppositely oriented nozzles, it is achieved that these generate a standing mist cloud in a particularly advantageous manner Droplets do not precipitate on walls of the cavity immediately after introduction into the cavity.
  • the protective agent mist can be moved within the cavity by generating a pressure difference between two disputed partial areas of the cavity.
  • a periodically repeated movement of the protective mist in the cavity can be generated by alternately generating an overpressure and a vacuum in at least one partial area of the cavity.
  • the protective agent mist distributes itself largely homogeneously in the cavity.
  • a distribution of the droplets of the protective agent mist can be positively influenced if the introduction takes place in a pulsed manner.
  • This is understood to mean that the parameters of the fog generation by the at least one fog generator change repeatedly.
  • the pressure of the air supplied to the mist generator could fluctuate periodically.
  • the average frequency of the pulsed operation is preferably between 0.1 Hz and 5 Hz.
  • mist generators which operate in such a way that a first of the two mist generators and a second of the two mist generators alternately discharge the relatively larger volume flow.
  • two separate and controllable mist generators are provided which are spaced apart and which alternate with the larger volume flow of corrosion protection agent deliver. This also makes it possible to generate a periodically recurring movement of the fog, which causes the fog to be distributed quickly and homogeneously.
  • a typical workpiece, which is protected against corrosion by the method according to the invention is the partial area of a body with an elongated cavity. In such a case, it is possible to let the protective mist exit through the outlet opening in alignment with the main direction of extension of the cavity.
  • the protective mist can also emerge from the outlet opening in a direction that is angled relative to the main direction of extent of such a cavity.
  • the protective mist moves helically within the preferably elongated cavity, which favors precipitation on all surfaces.
  • a similar effect can be achieved by providing an influence that takes place after the fog exits through the outlet opening.
  • the protective agent mist can be influenced in a targeted manner with regard to its direction of movement, in particular by supplying air from air nozzles different from the outlet opening. Due to their mutually angled alignment, these air nozzles are also capable of causing such a helical movement of the fog atmosphere.
  • Mist nozzles are already known from other areas of the prior art.
  • a possible embodiment provides that only the anti-corrosion agent is pressurized and atomized through a narrow single-substance nozzle.
  • the liquid anticorrosive agent is preferably supplied at a pressure of at least 20 bar, particularly preferably at least 60 bar. Higher pressures are particularly advantageous, especially from about 100 bar. It is true that the nebulization can be positively influenced by significantly exceeding this value. Beyond 120 bar, however, the effort involved in handling the protective agent before it is discharged is so great that it should normally be avoided.
  • An alternative design provides that corrosion protection agent and air, which are each pressurized, are mixed before or when the protective agent mist escapes.
  • the pressurized air tears apart the liquid anti-corrosion agent and thereby creates the mist.
  • this technique allows the generation of mist with a sufficiently small droplet size even at comparatively low pressures.
  • a feed pressure of between 1 bar and 3 bar for the corrosion protection agent and between 1 bar and 5 bar for the air is preferably used. Due to the low pressures, the total effort for the process is less than when using single-component nozzles, where higher pressures are required.
  • the two-substance nozzle is fed with air in such a way that it is accelerated to over 100 m / s, ideally to about 250 m / s before it emerges.
  • the best parameter selection for generating the desired protective agent mist is currently considered to be if a two-substance nozzle is used, within which anti-corrosion agent is atomized by gas, in particular air, the volume flow of the anti-corrosion agent being less than 100 g / min for atomization and the atomizing air with more than 100 m / s is supplied.
  • the supply pressure of the air from 1.5 bar to 2.5 bar and the supply pressure of the anti-corrosion agent from 2 bar to 4 bar are considered optimal.
  • the mist that can be created in this way forms a fine mist atmosphere, which is deposited in the form of a thin and very homogeneous protective layer on the walls of the cavity.
  • Another possibility of generating fog provides a high-frequency oscillating actuator, for example a piezo actuator or another form of an ultrasonic atomizer.
  • mist generators and outlet openings it can additionally be provided that they have a rotatable component, so that the outlet openings are in a rotational movement during the outlet of the corrosion protection agent, which serves for the homogeneous distribution of the corrosion protection agent.
  • a mist generation chamber can be connected upstream of the outlet opening.
  • the mist generator can be designed to generate the protective agent mist in the mist generation chamber.
  • Conveying means for conveying the protective agent mist to the outlet opening can be provided.
  • the upstream mist generation chamber is used to generate a homogeneous mist before it is introduced into the cavity to be preserved.
  • a conveying device such as a pump for conveying the protective agent mist or for generating an overpressure in the mist generation chamber, this mist is supplied to the cavity in the homogenized form.
  • the method can be used to feed the protective agent mist into a cavity between the walls of a double-walled hollow body. It can also be used to feed the protective agent mist into a cavity, the inner walls of which, starting from the positioning of the outlet opening within the cavity, are covered at least in sections by other wall sections. Surfaces of curved or angled cavities can also advantageously be provided with anti-corrosion agents using the described method. In such designs in particular, the protective agent mist can achieve better results than spraying protective waxes.
  • the system has a working position at which a workpiece with a cavity to be preserved can be positioned. It has a feed device for feeding a corrosion protection agent into the cavity.
  • the feed device has a mist generator with an outlet opening which can be positioned on or in the cavity to be preserved in such a way that the anti-corrosion agent can be introduced into the cavity in a nebulized form (protective agent mist).
  • the system can have air nozzles for introducing air for the purpose of moving the protective agent mist generated within the cavity.
  • the system can have at least one pressure generator, by means of which a partial vacuum or an excess pressure can be generated in a partial area of the cavity.
  • the pressure generator can be provided with a control device by means of which periodically changing pressure can be generated within the cavity.
  • the system is designed to generate a protective agent mist of the type described above.
  • system can have further components mentioned for the method described and in connection with the exemplary embodiments.
  • FIGS 1 and 2 show an exemplary workpiece 10, which can be, for example, a partial section of a sill of a motor vehicle. It poses Figure 1 one cut and Figure 2 a perspective, sectioned representation. As can be seen, a cavity 12 of this sill is not only limited by a cylindrical outer wall 20, but also by partition plates 22.
  • the aim of the method described here is to cover the surfaces within the cavity with anti-corrosion wax or wax-based anti-corrosion agent.
  • the aforementioned baffle plates 22 make it impossible to reach all surfaces starting from an end face region 14 of the cavity 12 by spraying corrosion protection agents.
  • Figure 3 shows how in the method according to the invention an applicator 30 with a mist nozzle (not shown in the figure) with an outlet opening 32 is inserted into the cavity 12 at the end.
  • the protective agent mist 40 is then introduced into the cavity 12 through the outlet opening 32 of the applicator.
  • the protective agent mist 40 consists of fine droplets with an average diameter of less than 60 microns.
  • the protective agent mist 40 is distributed within the cavity 12 and is deposited on the surfaces of the outer wall 20 and the partition plates 22.
  • the mist introduced is to be distinguished from spraying, which is already known in the area of cavity preservation.
  • spraying which is already known in the area of cavity preservation.
  • the generation of mist in the sense of the invention and the known spraying consistently provide that the liquid cavity preservative in the form of small droplets which are introduced into the cavity.
  • the mean droplet diameter is smaller, preferably less than 30 ⁇ m, particularly preferably less than 10 ⁇ m, and that the droplets do not hit and remain directly on a wall of the hollow body and remain there, but rather a fog atmosphere form within the hollow body, which moves very slowly within the hollow body.
  • the majority of the cavity preservative that is introduced into the cavity has not come into contact with the wall even 5 seconds after the introduction.
  • Figure 4 shows the cavity with a protective agent layer 50, which has deposited on the walls.
  • a protective agent layer 50 in areas 52 which would not have been accessible directly from the outlet opening 32 by spraying, but only due to the tendency of the protective agent mist 40 to be homogeneously distributed in the cavity 12 and to be deposited on the surfaces.
  • Figure 5 shows an example of a single-substance nozzle forming the mist generator 31.
  • This can be provided at the end in the applicator 30. It has a thin nozzle channel 34, the opening of which defines the outlet opening 32, a sharp-edged design being provided on edges 36 of this outlet opening 32 for the purpose of tearing the corrosion protection agent into fine drops.
  • the anti-corrosion agent is supplied through a supply channel 38 under high pressure. The higher the pressure, the finer the droplets of the anti-corrosion agent. It is particularly advantageous if the anti-corrosion agent in channel 38 has a pressure between 80 and 120 bar.
  • Figure 6 shows again, similar to the Figure 3 , the introduction of the anti-corrosion agent into the cavity.
  • the special feature here is that the outlet opening 32 is displaced within the cavity in the manner illustrated by the arrow 2. This can result in an even more homogeneous distribution of the fog.
  • the time required for the mist to be homogeneously distributed can also be shortened. This serves to achieve short cycle times.
  • pressure channels 70, 72 are respectively connected to the two opposite end regions 14, 16 of the cavity 12. These allow an overpressure or underpressure to be created specifically in the regions 14, 16. As a result, the cloud of fog 40 can in turn be moved back and forth within the cavity 12, as is illustrated by the arrows 4a, 4b. In particular, the complete overlap of the bulkhead plates 22 with anti-corrosion agents is favored by this.
  • the pressure channel 72 on the side opposite the nozzle can also be advantageous when introducing the cloud of fog, since it allows an air cushion to be generated by the application of air to introduce fog droplets at the pressure channel 72, which prevents that an excessively high proportion of the droplets is deposited directly on a wall of the cavity 12 due to their exit velocity.
  • Figure 8 shows a design in which, in addition to the applicator 30, two air nozzles 60 are introduced in the end region of the cavity, these air nozzles each defining an outlet direction of the air, which does not only run in the main direction of extent 1 of the cavity 12, but both in the clockwise direction or both in opposite directions are angled clockwise.
  • a helical swirl in the mist 40 can be generated, which, as it were, causes the mist to be screwed into the cavity and thereby in turn favors the covering of even difficult-to-access areas.
  • Figure 9 shows that something similar can also be achieved in that the mist generator itself has two outlet openings 32a, 32b which are angled in opposite directions in order to be able to generate the desired swirl.
  • the applicator 30 can rotate as a whole.
  • a mist generation chamber 80 belonging to the system and not belonging to the workpiece is provided, into which the protective agent mist 40 is generated by a mist nozzle 31. From here, the mist is fed to the actual cavity through a channel 90. This can be done by means of a pump 92 or, for example, by creating an excess pressure in the mist generation chamber 80 via a separate channel in addition to the protective agent mist 40, which presses the protective agent mist 40 through the channel 90 into the workpiece.
  • Fig. 11 shows a further exemplary embodiment, in which, in deviation from the previous exemplary embodiments, a mist generator 31A, 31B is provided at two ends of the cavity with a protective agent layer, each of which is designed as a two-component mist nozzle.
  • a mist generator 31A, 31B is provided at two ends of the cavity with a protective agent layer, each of which is designed as a two-component mist nozzle.
  • a mist generator 31A, 31B is provided at two ends of the cavity with a protective agent layer, each of which is designed as a two-component mist nozzle.
  • a protective agent layer each of which is designed as a two-component mist nozzle.
  • it can be nozzles of the type Mod. 970/0 S4 from the company Düsen-Schlick GmbH from Untersiemau / Coburg. These nozzles are in the case of the embodiment of the Fig. 11 inserted through side openings of the workpiece.
  • the mist generators 31A, 31B are supplied with anti-corrosion agent and air via lines 33A, 33B. Only a small volume flow of anti-corrosion agent of about 50 ml / min is supplied. The actual atomization at the outlet nozzle of the mist generator 31A, 31B takes place with inflow of air at a speed of approximately 250 m / s and with inflow pressures of 2 bar in the case of air and 3 bar in the case of the anti-corrosion agent. The result is the generation of a mist with an average droplet size of approximately 10 ⁇ m.
  • the cloud of mist emerges from the mist generator in the form of a cone, the speed in the center of this cone being approximately 16 m / s and rapidly falling to below 10 m / s to the outside. Due to the air resistance, the small droplets cause them to decelerate immediately after they exit. This effect is further enhanced by an air cushion that is created by the opposite mist generator.
  • the fine droplet size and the effect of these air cushions mean that the majority of the corrosion protection agent introduced initially forms a standing or only slightly moved foggy atmosphere, the droplets of which remain in suspension for at least 5 seconds until they settle on a wall.
  • the Figures 12 and 13 illustrate this phase of fog formation and precipitation.
  • the introduction can take place in a phase of 2 to 3 seconds in length, followed by a short phase of 1 to 3 seconds with the mist generator deactivated.
  • the 14 to 16 illustrate this using an example with two mist generators 31A, 31B.
  • fog is generated by the fog generator 31B on the left in the figures, we Fig. 14 shows.
  • the discharge is then continued again with a discharge process on the left mist generator 31B. In this way, the desired dense cloud of fine droplets 40 is obtained, which are then deposited on the walls in the manner already described.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Nozzles (AREA)

Claims (14)

  1. Procédé de recouvrement des parois intérieures d'une cavité de la carrosserie (10) d'un véhicule ou d'un accessoire de carrosserie de véhicule par une couche de protection (50) en cire de protection contre la corrosion ou en agent de protection contre la corrosion à base de cire, le procédé étant caractérisé par les caractéristiques suivantes :
    a. au moyen d'un générateur de brouillard (31), une cire de protection contre la corrosion ou un agent de protection contre la corrosion à base de cire sont appliqués sous forme nébulisée comme brouillard (40) d'agent de protection et sont apportés par une ouverture de sortie (32) dans la cavité (12) de la carrosserie (10) du véhicule ou de l'accessoire à protéger, le brouillard d'agent de protection étant constitué d'air et de gouttelettes de cire de protection contre la corrosion ou d'agent de protection contre la corrosion, le diamètre moyen des gouttelettes du brouillard apporté étant < 60 µm, les gouttelettes du brouillard d'agent de protection sortant de l'ouverture de sortie (32) à une vitesse < 10 m/s,
    b. le brouillard (40) d'agent de protection se déposant sur les parois intérieures de la cavité (12) de la carrosserie (10) du véhicule ou de l'accessoire et y formant une couche (50) d'agent de protection contre la corrosion.
  2. Procédé selon la revendication 1, présentant la caractéristique supplémentaire suivante :
    a. le diamètre moyen des gouttelettes du brouillard apporté est < 30 µm et de préférence < 10 µm.
  3. Procédé selon l'une des revendications précédentes, présentant la caractéristiques supplémentaire suivante :
    a. pendant l'apport du brouillard (40) d'agent de protection de la cavité (12) en un premier emplacement d'apport, un gaz, notamment de l'air, est apporté dans la cavité (12) en un deuxième emplacement d'apport différent du premier pour agir sur la direction d'écoulement de brouillard (40) d'agent de protection dans la cavité et/ou pour réduire la vitesse du brouillard (40) d'agent de protection.
  4. Procédé selon l'une des revendications précédentes, présentant la caractéristique supplémentaire suivante :
    a. le débit volumique d'agent de protection contre la corrosion apporté dans la cavité est inférieur à 200 g/minute, de préférence inférieur à 100 g/minute et de manière particulièrement préférable inférieur à 50 g/minute.
  5. Procédé selon l'une des revendications précédentes, présentant au moins l'une des caractéristiques supplémentaires suivantes :
    a. l'apport du brouillard (40) d'agent de protection s'effectue simultanément ou en alternance en plusieurs emplacements de la cavité (12) à protéger et/ou
    b. l'apport du brouillard (40) d'agent de protection s'effectue au moyen de plusieurs générateurs de brouillard ou par plusieurs ouvertures de sortie (32a, 32b) disposées en différents emplacements à l'intérieur de la cavité (12) à protéger et/ou disposées suivant différentes directions par rapport à la cavité (12) à protéger.
  6. Procédé selon l'une des revendications précédentes, présentant la caractéristique supplémentaire suivante :
    a. le brouillard (40) d'agent de protection est déplacé à l'intérieur de la cavité (12) par formation d'une différence de pression entre deux parties (14, 16) de la cavité (12) situées à distance l'une de l'autre.
  7. Procédé selon l'une des revendications précédentes, présentant la caractéristique supplémentaire suivante :
    a. un déplacement répété périodiquement du brouillard (40) d'agent de protection est formé dans la cavité (12) par formation alternée d'une surpression et d'une dépression dans au moins une partie (14, 16) de la cavité.
  8. Procédé selon l'une des revendications précédentes, présentant la caractéristique supplémentaire suivante :
    a. le générateur de brouillard (31A, 31B) est conduit au moins par phases de manière pulsée en alternant des paramètres de la formation du brouillard ou en interrompant par phases la formation du brouillard,
    le procédé présentant de préférence la caractéristique supplémentaire suivante :
    b. en fonctionnement pulsé, les paramètres alternés ou les interruptions de la formation du brouillard (31A, 31B) changent à une fréquence moyenne comprise entre 0,1 Hertz et 5 Hertz et de préférence entre 0,2 Hertz et 1 Hertz.
  9. Procédé selon l'une des revendications précédentes, présentant la caractéristique supplémentaire suivante :
    a. la formation du brouillard (40) d'agent de protection d'agent de protection contre la corrosion s'effectue au moyen d'au moins deux générateurs de brouillard (31A, 31B) conduits de telle sorte qu'un premier des deux générateurs de brouillard et un deuxième des deux générateurs de brouillard expulsent en alternance un plus grand débit volumique d'agent de protection contre la corrosion.
  10. Procédé selon l'une des revendications précédentes, présentant l'une des caractéristiques supplémentaires suivantes :
    a. le générateur de brouillard (31) forme le brouillard (40) d'agent de protection en refoulant l'agent de protection contre la corrosion sous pression par une ouverture de tuyère (34) ou
    b. le générateur de brouillard forme le brouillard d'agent de protection contre la corrosion au moyen d'un actionneur vibrant à haute fréquence,
    et présentant en particulier la caractéristique suivante :
    c. l'ouverture de sortie (32) par laquelle le brouillard (40) d'agent de protection est apporté dans la cavité (12) est placée au moins par phases en déplacement de rotation.
  11. Procédé selon l'une des revendications précédentes, présentant les caractéristiques supplémentaires suivantes :
    a. la formation du brouillard s'effectue par au moins une ouverture de tuyère (34) d'un diamètre inférieur à 0,5 mm et de préférence inférieur à 0,3 mm et
    b. l'agent de protection contre la corrosion est apporté à l'ouverture de tuyère (34) sous une pression d'au moins 20 bars, de préférence d'au moins 60 bars et de façon particulièrement préférable d'au moins 100 bars.
  12. Procédé selon l'une des revendications précédentes, présentant l'une des caractéristiques supplémentaires suivantes :
    a. le brouillard (40) d'agent de protection sort de l'ouverture de sortie (32) dans une direction oblique par rapport à la direction (1) d'extension principale de la cavité (12) et/ou
    b. après que le brouillard (40) d'agent de protection est sorti de l'ouverture de sortie, sa direction de déplacement est modifiée de manière contrôlée, en particulier par apport d'air par des tuyères à air (60) différentes de l'ouverture de sortie.
  13. Procédé selon l'une des revendications précédentes, présentant les caractéristiques supplémentaires suivantes :
    a. une chambre (80) de formation de brouillard est prévue en amont de l'ouverture de sortie (32) et
    b. le générateur de brouillard (31) est configuré pour former le brouillard (40) d'agent de protection dans la chambre (80) de formation de brouillard, et présentant en particulier la caractéristique supplémentaire suivante :
    c. un dispositif de transport (90) est prévu pour apporter le brouillard (40) d'agent de protection dans la cavité (12).
  14. Procédé selon l'une des revendications précédentes, présentant l'une des caractéristiques supplémentaires suivantes :
    a. le procédé est utilisé pour apporter le brouillard (40) d'agent de protection dans une cavité (12) située entre les parois d'un corps creux à deux parois ou
    b. le procédé est utilisé pour apporter le brouillard (40) d'agent de protection dans une cavité (12) dont au moins certaines parties des parois intérieures sont recouvertes par d'autres sections de paroi (22) du fait du positionnement de l'ouverture de sortie (32) à l'intérieur de la cavité (12).
EP17703199.4A 2016-02-09 2017-02-09 Procede destine a revetir les parois interieures d'un espace creux a l'aide d'une couche de protection anticorrosion constituee de cire ou a base de cire Active EP3414020B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP16154796.3A EP3205407B1 (fr) 2016-02-09 2016-02-09 Procede et installation destines a revetir les parois interieures d'un espace creux a l'aide d'une couche de protection anticorrosion a base de cire
PCT/EP2017/052932 WO2017137520A1 (fr) 2016-02-09 2017-02-09 Procédé et dispositif pour recouvrir des parois intérieures d'une cavité avec une couche protectrice constituée de cire anticorrosion ou d'un agent anticorrosion

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EP3414020A1 EP3414020A1 (fr) 2018-12-19
EP3414020B1 true EP3414020B1 (fr) 2020-04-08

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EP16154796.3A Active EP3205407B1 (fr) 2016-02-09 2016-02-09 Procede et installation destines a revetir les parois interieures d'un espace creux a l'aide d'une couche de protection anticorrosion a base de cire
EP17703199.4A Active EP3414020B1 (fr) 2016-02-09 2017-02-09 Procede destine a revetir les parois interieures d'un espace creux a l'aide d'une couche de protection anticorrosion constituee de cire ou a base de cire

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US (1) US10870124B2 (fr)
EP (2) EP3205407B1 (fr)
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DE102020127076A1 (de) * 2020-01-20 2021-07-22 Jens-Werner Kipp Verfahren zur Dünnbeschichtung innenliegender Oberflächen von Durchgangsausnehmungen

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Publication number Publication date
EP3414020A1 (fr) 2018-12-19
WO2017137520A1 (fr) 2017-08-17
US10870124B2 (en) 2020-12-22
EP3205407A1 (fr) 2017-08-16
CN108698066A (zh) 2018-10-23
US20190022686A1 (en) 2019-01-24
EP3205407B1 (fr) 2019-09-25
CN108698066B (zh) 2021-10-29

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