DE102008017654A1 - component arrangement - Google Patents

Abstract

According to the invention, in a component arrangement in which a plastic component and a metallic component form a functional or structural unit, the plastic component is provided with a corrosion-inhibiting or corrosion-inhibiting substance (VCI) which transgresses the gas phase. The arrangement of the two components allows the action of the substance on the metallic component, in particular involving the gas phase.

Description

The The invention relates to a component arrangement of a metallic Component and a plastic component according to the Preamble of claim 1.

Such Component arrangements are z. In machines of industrial control and drive technology frequently found. The metallic component can z. As a cast housing or a magnetizable steel and as such is typically prone to corrosion. For transport often packaging films or papers used with a corrosion inhibitor - so called VCI substances - are provided. The corrosion inhibitor gast from the film and protects the metal component.

As an example of the aforementioned component arrangement, a bearing arrangement is mentioned, which is used in actuating magnets for valves or variable displacement pumps for supporting an armature in a pole tube. The DE 103 27 875 A1 shows an electromagnet, in which a pole tube is inserted into a plain bearing bush in which an armature is displaceable. The DE 199 07 732 A1 discloses a similarly constructed electromagnet wherein a foil bearing is used instead of the sliding bushing. The DE 197 16 517 A1 shows an electromagnet, in which between the armature and Polrohrinnenumfangswandung a sliding bush is provided as an abdominal bearing. An additional storage of the armature via a rod which passes through the armature in the axial direction and is guided in the pole tube. Both the rod and the sliding bush are made of a self-lubricating plastic.

Problematic In all these solutions is that both the pole tube as also the anchor made of magnetizable material so that the use of stainless steel usually fails. Magnetizable steels are, however, usually very susceptible to corrosion, so special measures have to be taken to protect the electromagnet from corrosion. Such Corrosion is with oil-filled electromagnets no problem during operation as the corrosion of the hydraulic oil is prevented. In the time to commissioning or at a dry operation of the electromagnet is currently Preventing corrosion by when installing the magnet corrosion-inhibiting medium is introduced into the magnet interior. Such a filling with a corrosion-inhibiting Fluid can in a bad operating conditions to a "Sticking" of the components or to bind dirt inside the magnet. When using corrosion-inhibiting gases there is a risk that they evaporate during storage, so that the corrosion protection only for comparatively small Time is guaranteed.

These Problem arises in virtually all applications in which a component made of a corrosion-sensitive material is used, especially if it is in a plain bearing or other guide is guided.

Of the Invention is based on the object of providing a component arrangement, in which the corrosion protection is improved.

According to the invention in a component assembly in which a plastic component and a metallic component is a functional or structural unit form, the plastic component with a transgressing into the gas phase provided corrosion-inhibiting or corrosion-preventing substance. The arrangement of the two components allows the action of the substance on the metallic component, in particular involving the Gas phase.

On This way, a functional component or a structural plastic component with an additional function, namely the corrosion protection of provided a nearby arranged metallic component. A transport packaging equipped with anti-corrosion properties can be reduced or eliminated or by a standard packaging, Cardboard etc. be replaced. This reduces logistics costs for the transport of building units. If sufficiently tight enclosed space may possibly provide protection against corrosion the service life of a unit can be achieved. Plastic parts are in today's products of engineering, electronics and factory automation almost ubiquitous. Therefore, can with little effort an integrated corrosion protection, at least for Transportation purposes are achieved.

Further advantageous embodiments of the invention are the subject the dependent claims.

Especially The corrosion-inhibiting or corrosion-preventing Fabric act when dispensed into an enclosed interior becomes. The interior can predominantly by the metallic component be defined. The metallic component can also in the interior be arranged. The plastic component is preferably in the interior arranged or it forms a boundary surface of the interior out.

In principle, many different plastics are suitable as carriers for a corrosion-inhibiting or corrosion-inhibiting substance, in particular thermoplastics, thermosets, elastomers, fiber-reinforced plastics or plastics provided with fillers. Possibly. can the plastic in question have a certain porosity to absorb the corrosion-inhibiting or corrosion-preventing substance. In particular, polyamides, polytetrafluoroethylene or polyethylene and polycarbonates can be provided with corrosion-inhibiting or corrosion-inhibiting substances.

The Plastic component can in principle all functions and structural Meet requirements for the conventional Plastic components are used. Examples are elastic Damping elements, bearing elements in plain bearings, sliding blocks, Bearing segments, cages in roller, ball or needle bearings, transmission links for mechanical movements such as valve tappets, Waves, etc., spacers such as discs, especially anti-slug discs in magnets, supports for electronic boards, stop elements for limiting movement in linear drives, housing components, Sockets, sealing elements such as O-rings, R-rings or sealing sleeves, if necessary Sliding bands, or valve cone or seating surfaces in pneumatics or hydraulic valves, or pistons in piston-cylinders Units.

Preferably is a sliding or bearing element of a storage as a carrier for corrosion inhibiting or preventing substance (corrosion inhibitor) formed, which goes into the gas phase and up the corrosion sensitive material settles or the corrosion sensitive Material forms ambient atmosphere, making this reliable is protected against corrosion. This corrosion protection is also for longer storage or longer operation guaranteed the respective bearing pairing. This transition of inhibitors in the gas phase and the settling of the substances The corrosion-sensitive material is largely independent from usual temperatures or humidities, so that Corrosion protection even in extreme climatic conditions is effective.

When So-called VCI substances (Volatile Corrosion Inhibitor). These often consist of salts, such as nitrides, amines, on the surface to be protected form a closed protective layer and already existing Penetrate water films or the like. The presence of these VCI substances inhibits the anodic and cathodic partial reactions in the Corrosion, depending on the configuration of the carrier layer a duration of action of up to several years can be achieved.

The Use of VCI substances per se is already out of packaging technology known, wherein these are introduced into packaging films, in the component to be protected is packed. Within this packaging then arises through the transition of The gas phase inhibitors have a saturated, anti-corrosion ensuring an atmosphere. When opening volatilize this packaging of the workpiece However, the VCI, so then no more corrosion protection consists. Ie. with such a conventional technique Although the electromagnets described above could indeed so that the corrosion protection during storage time persists - in a dry operation of the electromagnets or when an oil is taken out of service Electromagnet, in which the oil from the inside out but would also no longer corrosion protection present, so that even then the problem described above results.

According to the invention it is particularly preferred if the carrier for the a corrosion preventing material consists of plastic, so that the corrosion-sensitive component along this plastic carrier slides.

Of the Carrier is particularly easy to handle, if it is designed as a film.

One important application of the invention is electromagnets, wherein the above-described carrier, for example, between an anchor and a pole tube (prone and rod storage) can be trained. In this case, the carrier as a film or be designed as a plastic bush in which the anchor is guided axially displaceable.

The This invention can be used with bearing elements in general which the storage area as a carrier for Such corrosion-inhibiting substances can be carried out. For example, bearing bushes made of plastic (for example made of PTFE) or made of composite material or plastic Guide rings for components, for example Piston rods or pistons of hydraulic cylinders for an inventive Equipped with degassing corrosion inhibitors. For storage elements Wear can be used to advantage in the course the material removal gradually more depots of in the bearing element to open embedded corrosion-inhibiting substances.

The Invention is also not limited to bearing elements as mentioned above, but may be any component arrangements of a plastic component and a metallic potentially corrosion-prone component in which it is ensured that the corrosion-inhibiting or -verhindernde fabric, which of the plastic component in gaseous form is discharged, can act on the metallic component.

An embodiment of the invention will be explained in more detail below with reference to a single schematic drawing, which greatly unite Cross section of an electromagnet shows.

The basic structure of an electromagnet 1 is for example from the DE 199 52 800 A1 known, so that in the following only the essential for understanding the invention components are described. Such an electromagnet 1 has a coil housing accommodating a coil 2 which is a pole tube 4 surrounds in sections. On the coil housing 2 is a plug socket 3 for the electrical connection of the electromagnet 1 placed. The pole tube 4 has an anchor reception room 6 in which an anchor 8th made of axially magnetizable material is also axially displaceable. This anchor 8th has a pestle 10 which extends through one opposite the anchor receiving space 6 radially set back ram channel 11 extends through and from the left in the figure, the end portion of the pole tube 4 protrudes. This pestle 10 acts, for example, on a valve spool of a valve to this when energizing the electromagnet 1 to adjust. The left in the figure, from the bobbin case 2 projecting end portion of the pole tube is as a fastening paragraph 12 formed, over which the electromagnet 1 can be screwed to the valve to be operated. The other end portion of the pole tube 4 is through a tail 14 closed, with the peripheral wall of the pole tube 4 connected by crimping. This tail 14 is provided with an external thread on which a fastening nut 16 screwed on, which is the coil housing 2 against a radial shoulder 18 biased to fix this in the radial direction. The one in the anchor receiving room 6 absorbed anchor 8th is with axially parallel compensation holes 20 provided on the limited by the respective end faces sub-chambers of the anchor receiving space 6 connected together, so that when oil-filled operation of the electromagnet 1 the oil can overflow from the shrinking frontal space into the other, enlarging space.

According to the invention, the inner circumferential wall of the anchor receiving space is provided with a bearing foil 22 coated or lined, along the outer circumference of the anchor 8th is guided. This bearing foil fulfills a double function: on the one hand it reduces the sliding friction between the anchor 8th and the pole tube 4 so that the electromagnet 1 is very easy and adjustable with little delay. On the other hand, the bearing foil is used 22 as a carrier for the VCI substances described above, which outgas during storage and in a dry operation, so that inside the electromagnet 1 forms an atmosphere of corrosion-preventing substances, which partially settle on the peripheral surfaces of the components and thus form a moisture-displacing and moisture-impermeable layer, so that corrosion is effectively prevented. It is advantageous that the electromagnetic interior is relatively small and little air exchange takes place, so that this atmosphere is very long. Even with low Lekagen the anti-corrosive effect is not worsened, because then more substances from the bearing foil 2 diffuse out until a thermodynamic and chemical equilibrium state between gas phase and embedded in the bearing film phase.

In the above embodiment, a bearing foil 22 used. Instead of such a film, of course, a bearing bush made of plastic or of a composite material (so-called DV sockets) could be used. In principle, the carrier for the VCI substances could also be on the outer circumference of the anchor 8th , That can be arranged, that is, the movable member.

According to the invention in a component assembly in which a plastic component and a metallic component is a functional or structural unit form the plastic component with a transgressing into the gas phase provided corrosion-inhibiting or corrosion-preventing substance. The arrangement of the two components allows the action of the substance on the metallic component, in particular involving the Gas phase.

On This way, a functional component or a structural plastic component with an additional function, namely the Corrosion protection from a nearby arranged metallic Component provided. One equipped with anti-corrosion properties Transport packaging can be reduced or eliminated or by a standard packaging, cardboard boxes, etc. are replaced. This is reduced the logistics costs for the transport of construction units. If the installation space is sufficiently tight, it may be possible to achieved a corrosion protection over the service life of a structural unit become. Plastic parts are used in today's products of mechanical engineering, electronics and factory automation almost ubiquitous. Therefore can with little effort an integrated corrosion protection, at least be achieved for transport purposes.

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

• - DE 10327875 A1 [0003]
• - DE 19907732 A1 [0003]
• DE 19716517 A1 [0003]
• DE 19952800 A1 [0022]

Claims (11)

Component arrangement of a metallic component and a plastic component to form a functional or structural unit, characterized in that the plastic component as a carrier ( 22 ) is formed for a corrosion-inhibiting or -verhindernden substance, which merges into the gas phase, and that the spatial arrangement of the plastic component and the metallic component allows an action of the substance on the metallic component. Component arrangement according to Claim 1, characterized that a substantially enclosed interior space is formed, and that the plastic component is arranged so that the material is discharged into the interior. Component arrangement according to claim 1 or 2, characterized in that the plastic component is at least one of the following Has functions, namely damping element, Slide bearing element, cage element, transmitter of linear or rotary movements, spacers, stop, Housing element, sealing element, piston in a piston-cylinder Arrangement. Component arrangement according to one of the preceding claims, characterized in that the plastic component comprises at least thermoplastics, Thermosets, elastomers, or fiber-reinforced plastics or comprising fillers provided with plastics. Component arrangement according to one of the preceding claims, characterized in that the substance so-called VCI substances, in particular Water vapor-containing substances such as salts (nitrides, amines) includes. Component arrangement according to one of claims 1 to 5, designed as a bearing arrangement for a movable along a sliding or bearing element member, which consists of a corrosion-sensitive material or with a component consisting of corrosion-sensitive material to sammenwirkt, characterized in that the sliding or bearing element ( 22 ) is formed as a carrier for the anti-corrosive or preventive substance which undergoes gas phase and protects the corrosion-sensitive material from corrosion by forming a layer deposited thereon or an atmosphere surrounding the corrosion-sensitive material. Component arrangement according to claim 6, wherein the carrier ( 22 ) is designed as a plastic film. Component arrangement according to one of the claims 6 or 7, wherein the carrier ( 22 ) between an anchor ( 8th ) and a pole tube ( 4 ) of an electromagnet ( 1 ) is trained. Component arrangement according to claim 8, wherein the carrier ( 22 ) between the outer circumference of the armature ( 8th ) or one of the anchors ( 8th ) associated guide rod and the corresponding guide portion of the pole tube ( 4 ) is trained. Component arrangement according to one of the claims 6 to 9, wherein the carrier on a bearing bush made of plastic or composite material is formed. Component arrangement according to one of the claims 6 or 7, wherein one existing as plastic or composite material Guide ring, for example for a piston rod or a piston of a hydraulic cylinder designed as a carrier is.