DE102008009251A1 - Pre-treatment system for pretreatment of white walled rims, has pretreatment stations with dehydration station and dipping station with ultrasonic device, which comprises ultrasonic source, and conveyor provided with source - Google Patents

Abstract

The system (10) has pretreatment stations comprising a dehydration station (12) and a dipping station with an ultrasonic device. The ultrasonic device comprises an ultrasonic source, and a conveyor is provided with the source. The conveyor is formed and arranged in such a manner that parts formed as glossy rotated rims are guided with glossy rotated sides of the parts to the source, at a distance of 15 to 30 centimeters. The ultrasonic source is provided in the form of side transducer or base transducer. An independent claim is also included for a method for pretreatment of white walled rims.

Description

The The invention relates to a pretreatment plant for the pretreatment of Parts, in particular for the pretreatment of special rims (high-gloss Rims), with a plurality of pretreatment stations.

The Invention further relates to a method for pretreating parts, in particular for the pretreatment of special rims (high-gloss rims), in which the parts pass through a plurality of pretreatment stations promoted become.

at The rims go through a first production of alloy wheels Pre-treatment plant, then a powder primer and finally a final coating device, in which they are, for example, finally coated with acrylate powder.

Next this usual Treatment process for the production of standard rims (alloy wheels made of aluminum or possibly magnesium alloys) are in recent times more and more so-called "glossy-copied Rims "(also called" glossy rims "called) demanded. For producing such rims, which have a high-gloss surface, and which will be referred to as special rims below previously at least powder-coated standard rims in a rotating device their surface mechanically reworked, z. B. by turning, leaving only a rest the previously applied coating remains on the surface. At the Turning or post-processing operation are cutting emulsions used, which are difficult to remove again. The thus treated Blanks go through another pretreatment, followed by a Final coating, which in turn is preferably an acrylate powder coating is. To such highly reflective surfaces also in the following To obtain procedural steps, the pretreatment differs in some Procedural steps somewhat from the usual pretreatment of normal rims.

Usually glazed blanks go through two first after twisting Degreasing stations, then two rinse stations, then a decanting station (pickling station), followed by two rinsing stations, a passivation station and two further rinsing stations, a drying station and a cooling station. After passing through such a pretreatment plant, the gloss-finished blanks of a coating station for final coating supplied which may, for example, be an acrylate powder coating.

Now It has been shown that polished wheels many times in recent times increased demands the manufacturer regarding the corrosion resistance and durability of the rims do not match. In many cases results especially in the area of the high-gloss surface at the edges and pores or voids an increased tendency to corrosion.

Of the Invention is based on the object, an improved pre-treatment plant and to provide an improved method of pretreating parts, which particular special rims are processed so advantageous can, that the known disadvantages of ready-coated, bright-turned Rims are avoided or reduced. In particular, should a high-quality and durable coating of polished wheels be reached, wherein also in the area of the glossy turned surface preferably low tendency to corrosion should exist.

These The object is achieved by a Pre-treatment plant for the pretreatment of parts, in particular solved for the pretreatment of special rims, with a plurality of Pretreatment stations, wherein at least one of the pretreatment stations, preferably a degreasing station, a diving station with a Includes ultrasonic device.

The The object is further achieved by a method for pretreating parts solved, in particular for pretreating special rims, in which the parts be funded by a plurality of pretreatment stations, wherein the parts are at least in one of the pretreatment stations, preferably in a degreasing station, by means of ultrasound to be cleaned in a dipping bath.

The The object of the invention is completely solved in this way.

According to the invention, it has been found that the increased tendency of special rims to corrode to a considerable extent, in particular in the area of the edges of the lustered surface, is due to the fact that in the lustering step during which the surface is completely or partially removed, parts of the previous coating are turned off Surface remain. Cutting emulsions used in the turning process penetrate deep pits such as pores or voids. Through the turning tool castings are cut in the light metal alloy and thus exposed. This results in the surface partially depressions that are filled with insufficiently adherent foreign materials, such as cutting emulsions, or with parts of the previously applied coating. The consequence is an insufficient liability of a following brought finish coating.

According to the invention the use of a diving station with an ultrasonic device a greatly improved cleaning or intensification of the respective Pre-treatment step ensured.

On this way you can Residues in the area the glossy surface be removed better by the pre-treatment, resulting in an improved Adhesion of a subsequently applied coating leads. Consequently results in a significantly improved resistance of bright-rolled rims and a reduced susceptibility to corrosion.

Preferably the treatment takes place in a diving station with an ultrasonic device at least in the area of a degreasing station, preferably at the last degreasing stage (after-cleaning) thus by the previous one Turning remaining residues in the area the glossy surface with ultrasound support can be effectively removed.

Further Preferably, other stations include the pretreatment plant one diving station each with an ultrasonic device.

On This way, the effectiveness of each pre-treatment steps improved.

in this connection can the ultrasound devices each be part of a respective pretreatment station or join as a downstream treatment station. So can For example, a Dekapierstation (pickling station) with an ultrasonic device be coupled. This achieves an intensified pickling process. This allows a deep cleaning or rinsing. The concentration in the As a result, pickling baths can be greatly reduced, and deep-bedding is possible allows.

alternative can also connect a separate dip, the only with a Ultrasonic device is provided, which is about a rinsing station with ultrasound support can act.

There an effective ultrasonic cleaning only in conjunction with a dip can be achieved according to the invention, even if the pre-treatment plant in principle is designed as a continuous system, at least one diving station provided with an ultrasonic device. In a continuous flow system So can the different successive spray treatment stations if necessary, in each case connect an immersion bath with ultrasound support, preferably at least one diving station in the area of degreasing.

According to one Another embodiment of the invention, the ultrasonic device at least one ultrasonic source, wherein a conveyor provided is, which is designed and arranged such that the as glossy turned Rims trained parts with their glossy turned side at the Ultrasound source led along be, preferably at a distance of 10 to 50 cm, especially preferably from 15 to 30 cm.

On This is especially true in the area of the bright-turned surface, the especially in view of a good adhesion, later coating endangered is, an extraordinary one intensive ultrasound effect and deep treatment guaranteed. So can the necessary concentration of chemicals used be reduced.

According to one Another embodiment of the invention, the ultrasonic device at least one ultrasonic source in the form of a side oscillator and at least one ultrasonic source in the form of a floor vibrator on. Alternatively or in addition can also attachable Schwinger be provided.

Also As a result, a particularly good ultrasonic effect can be achieved.

The Parts or special rims are preferred with the rotated side slightly tilted upwards, z. B. with about 30 °, to a floating of oil, air bubbles and to support light dirt.

in this connection can at least one ultrasonic source in the form of a side oscillator and at least one ultrasonic source in the form of a floor vibrator be combined in a dip.

alternative may be at least one ultrasonic source in the form of a side oscillator and at least one ultrasonic source in the form of a floor vibrator in separate dipping baths be provided.

The Pre-treatment plant preferably comprises a sequence of pre-treatment stations, the at least one degreasing station, one rinsing station, one decap station, another rinse station, one Passivation station and another rinsing station and have the from a sponsor be passed through, preferably one each diving station is provided with an ultrasonic device.

On this way is a particularly intense pretreatment and a particularly high-quality coating, in particular for bright-turned Rims guaranteed.

According to one further execution According to the invention, the pretreatment plant has a rinsing station as the last stop on a dip with deionized water (deionized water) with a conductance of 0.1 to 3 μS / cm and an ultrasonic device.

So is a particularly good cleaning of the parts before a subsequent coating guaranteed which improves the adhesion of the coating and the tendency to corrosion is minimized.

As previously mentioned, The pretreatment plant can be designed as a continuous system.

alternative However, the pre-treatment plant can also be designed as a diving system being, with some of the immersion baths each may be combined with an ultrasonic device.

In Alternatively, the object of the invention is achieved by a pretreatment plant solved for the pretreatment of parts, in particular for the pretreatment of special rims (high-luster Rims), with a plurality of pre-treatment stations, with one Drying station at the end of the pretreatment plant, and with at least an intermediate drying station in the area of a pre-treatment stage.

Further The object of the invention with regard to the method for pretreatment of parts solved by a method, especially for pretreatment of special rims (glossy rims) is suitable, in which the Parts are promoted by a plurality of pretreatment stations and dried at the end of the pretreatment process, wherein the parts after a pre-cleaning subjected to an intermediate drying become.

Also In this way, the object of the invention is completely solved.

It was in fact found that the liquid from the gloss turning, in which one works wet, in the surface of the Rims embedded especially in fine pores. Through an intermediate drying step can this liquid mostly be evaporated, resulting in a significantly improved adhesion at a later Powder coating or painting results.

Of the Intermediate drying step is advantageously carried out after a rinse preferably with demineralised water at the end of the respective pretreatment stage, ie approx Degreasing, pickling (pickling), preferably before passivation.

Advantageous the intermediate drying step takes place after an external pre-cleaning, the advantageous with ultrasonic support or with high-pressure lamps carried out can be used, which are also worked gently with dry ice can.

Preferably The parts are in the intermediate drying to a part temperature of more than 100 ° C heated be, preferably to a temperature in the range of about 105 up to 140 ° C, preferably for at least 5 or at least 10 minutes.

On This way, a substantial evaporation of the water content reached from surface pores.

Preferably the pre-treatment plant is operated with a circular conveyor or Power & Free conveyor.

Preferably the special rims are successively and not two or one more rims on top of each other transported.

Advantageous in continuous flow systems for the arrangement of ultrasonic transducers are separate sonication zones in a bath, sometimes with different frequencies, z. B. 70 or 140 kHz is sonicated.

Preferably the sound in the different zones takes place first as Pulse or short pulse train and then at longer intervals or in Form of continuous sound.

According to one Another variant of the invention, which is also independent of those previously described Characteristics protectable is preferably after the mechanical production (twisting the special rims) a hot water cleaning without addition of chemicals or only small additions of chemicals the actual pretreatment (which, for example, with a degreasing station starts). In this case, water or deionized water is used. The temperature in this aqueous Zone should be at least 60 ° C-100 ° C, preferably 80 ° C. This treatment can be sprayed or dipped with or without Ultrasound done.

Preferably the parts (special rims) will be added to the frame on the later mounted tire unvisible surface, so that the special rims not visibly damaged on the support.

Preferably lower concentrations of the baths are used, e.g. B. in the Cleaning less than 0.5%.

It is understood that the ge above and the feature of the invention to be explained below not only in the particular combination given, but also in other combinations or in isolation of the invention can be used without departing from the scope of the invention.

Further Features and advantages of the invention will become apparent from the following Description of preferred embodiments with reference to the drawing. Show it.

1 a schematic representation of a pretreatment plant according to the invention with upstream stations in the form of a herkömmli chen pretreatment plant, a coating system and a gloss turning device, as well as with a downstream coating system for the final coating of bright-turned rims;

2 an enlarged view of a diving station according to the invention with ultrasonic devices; and

3 a simplified representation of a conveyor for the promotion of rims by diving stations with ultrasonic devices.

In 1 is a pretreatment plant according to the invention in total with the numeral 10 designated.

The pretreatment plant 10 includes two consecutive degreasing stations 12 . 14 followed by a degreasing station 16 in the form of a dip bath with an ultrasonic device, also two subsequent rinsing stations 18 . 20 as well as another rinsing station 22 in the form of a dip bath with an ultrasound device, furthermore a decap station 24 in the form of a decapping dip bath with ultrasonic equipment, followed by two rinsing stations 26 . 28 and another rinse station 30 in the form of a dipping bath with ultrasound support, again followed by a passivation station 32 in the form of a dipping bath with ultrasonic support, which in turn has two rinsing stations 34 . 36 and another rinse station 38 connect in the form of a dip with an ultrasonic device. At the last rinse station 38 close a drying station 40 and a cooling station 42 at.

For the sake of completeness, with numeral 46 nor an upstream (conventional) pretreatment plant indicated to pretreat rims in a subsequent coating plant 48 For example, be powder-coated and in a subsequent Glanzdreheinrichtung 50 be turned. Parts prepared in this way then arrive 12 in the pretreatment plant according to the invention 10 ,

After passing through the pretreatment plant according to the invention 10 the pretreated parts are preferably in a subsequent coating system, with 52 is hinted, then finally from the finished coated, bright rolled rims can be removed, which are then subjected to a final inspection.

in the Case shown here is in the pretreatment plant according to the invention at each of the various pretreatment steps (degreasing, rinsing, picking, Do the washing up, Passivate, rinse) in each case at the end of a diving station with an ultrasonic device inserted. In the case of Dekapierstation and Passivierungsstation are the respective immersion baths with ultrasound support executed whereby the pickling effect in the picking station or the passivation effect is intensified in the passivation station.

The last flushing station 38 is preferably carried out as a dipping bath with demineralised water with a conductivity of 0.1-3 μS / cm, for example with 0.2 μS / cm, and with ultrasound support.

It It is understood that the ultrasonic devices in any Way combined with a diving station of the pretreatment plant could be.

In 2 is shown schematically that parts 54 , which are formed in particular as a high-sheen rims, in the area of its bright-turned surface 56 preferably by a conveyor close to associated ultrasonic vibrators, such as vertically stacked side vibrators 58 to be guided along. Here, the movement takes place at a small distance of preferably 10 to 50 cm, or about 15 to 30 cm. In this way, a particularly intense ultrasonic effect is ensured, especially in the area of the previously bright-turned surface.

Additionally or alternatively, in the bottom region of the respective immersion bath 16 floor vibrator 60 be provided. Furthermore, in addition or alternatively, attachable oscillators may be provided.

By a slight inclination of the parts 54 with its glossy side up the result is improved. For this, the oscillators are installed parallel to the slope.

In 3 is a promoter 44 exemplified, by means of which the parts 54 through the pretreatment plant 10 be encouraged. It is about an overhead conveyor 44 with a frame 62 , on which a support surface with supports 68 to take a part 54 in form of a Rim is provided to guide them through the individual treatment stations including the at least one immersion bath with ultrasonic device. Preferably, the frame 62 in the region of its lower end additionally a guide element 66 on that in a lead 64 is guided so as to ensure a clean guidance of a rim by a dip and / or through a spray tunnel.

In 4 an alternative embodiment of the invention is shown. In 4 is a total pretreatment plant according to the invention with 70 designated. The parts 54 , for example in the form of rims, come from an upstream gloss turning device 50 to the pretreatment plant 70 , The pretreatment plant 70 includes the usual pre-treatment stations such as degreasing, pickling, passivation, drying, each with corresponding downstream rinsing stations with water or demineralized water (deionized water). These basically known stations are not listed here again, only the drying station 40 and the downstream cooling station 42 before handing over to a powder coating plant 52 ,

At the Glanzdreheinrichtung 50 Mechanical processing is carried out by turning with the addition of cutting emulsions.

Through this mechanical processing step, liquid enters the surface pores of the parts 54 , In the downstream pre-cleaning station 72 there is a pre-cleaning of the parts. As described above, this can be done using ultrasound devices, for example. Additionally or alternatively, cleaning with high-pressure cleaners can also be carried out with the aid of dry ice. Possibly. can also be dispensed with such intensive pre-cleaning and only a conventional degreasing be performed.

Preferably, the pre-cleaning station comprises 72 a rinsing station and a VE rinsing station for pure rinsing. Only then does an intermediate drying station close 74 at. In the intermediate drying station are the parts 54 heated to a part temperature of at least 100 ° C, preferably to a temperature of about 105 ° C to 115 ° C. Ideal exposure times of at least 10 minutes at at least 110 ° C. This allows the in the surface pores of the parts 54 Existing liquid are largely evaporated without residue, resulting in improved adhesion in a subsequent powder coating of the parts 54 results.

Also the further pretreatment steps, such as picking each such intermediate drying station with the above-mentioned temperature or time values are followed.

Preferably is the intermediate drying before the passivation (chromating) used.

All in all let yourself such a significantly increased cleaning and pretreatment effect. This leads to a much improved product quality in the end products after powder coating.

A another variant (not shown in the drawing) is the actual pre-treatment plant upstream of a hot water cleaning station. There will be a hot water cleaning without Addition of chemicals or with only a small amount of chemicals the actual pretreatment (which, for example, with a degreasing station starts). In this case, water or deionized water is used. The temperature in this aqueous Zone should be at least 60 ° C-100 ° C, preferably 80 ° C. This treatment can be sprayed or dipped with or without Ultrasound done.

By this hot water pre-cleaning become lubricant residues left over from mechanical post-processing partially removed or at least diluted.

Thereby the effectiveness of the pretreatment is improved.

Claims (24)

Pre-treatment plant for the pretreatment of parts ( 54 ), in particular for the pretreatment of special rims (high-gloss rims), with a plurality of pretreatment stations ( 12 . 14 . 16 . 18 . 20 . 22 . 24 . 26 . 28 . 30 . 32 . 34 . 36 . 38 ), wherein at least one of the pretreatment stations, preferably a degreasing station ( 16 ), a diving station comprising an ultrasonic device. A pretreatment plant according to claim 1, wherein the ultrasound device comprises at least one ultrasound source ( 58 . 60 ), and in which a conveyor ( 44 ) is provided, which is designed and arranged in such a way that the parts designed as luster-turned rims ( 54 ) with her glossy turned side ( 56 ) at the ultrasound source ( 58 ), preferably at a distance of 10 to 50 cm, more preferably 15 to 30 cm. Pre-treatment plant according to claim 2, wherein the ultrasound device comprises at least one ultrasound source in the form of a side oscillator ( 58 ) and / or at least one ultrasonic source in the form of a floor vibrator ( 60 ) having. Pre-treatment plant according to claim 3, at the at least one ultrasound source in the form of a side oscillator ( 58 ) and at least one ultrasonic source in the form of a floor vibrator ( 60 ) in a dip ( 16 ) are provided. A pretreatment plant according to claim 3, wherein at least one ultrasonic source in the form of a side oscillator ( 58 ) and at least one ultrasonic source in the form of a floor vibrator ( 60 ) are provided in separate immersion baths. Pretreatment plant according to one of the preceding claims, comprising a series of pretreatment stations, comprising at least one degreasing station ( 12 . 14 ), a rinsing station ( 18 . 20 ), a decap station ( 24 ), another rinsing station ( 26 . 28 ), a passivation station ( 32 ) and another rinsing station ( 34 . 36 ) and that of a conveyor ( 44 ) and preferably each a diving station ( 16 . 22 . 24 . 30 . 32 . 38 ) with an ultrasonic device. Pre-treatment plant according to one of the preceding claims, which is designed as a continuous installation, wherein at least one spray treatment station is a dipping station ( 16 . 22 . 24 . 30 . 32 . 38 ) is connected downstream with an ultrasonic device. Pre-treatment plant according to one of claims 1 to 6, which is designed as a diving system. Pre-treatment plant according to one of the preceding claims, with a final rinse station ( 38 ) as the last treatment station, which operates as a spray or dipping station with deionized water (deionized water) with a conductivity of 0.1 to 3 μS / cm and preferably comprises an ultrasonic device. Pre-treatment plant according to one of the preceding claims, characterized in that in the individual ultrasonic baths ( 16 ) are integrated several PA zones. Pre-treatment plant according to claim 10, characterized in that that the inlet oscillators deliver short pulses at intervals. Pre-treatment plant according to claim 10, characterized in that that the discharge oscillators give long pulses or permanent swing. Pre-treatment plant for the pretreatment of parts ( 54 ), in particular for the pretreatment of special rims (high-gloss rims), with a plurality of pretreatment stations ( 12 . 14 . 16 . 18 . 20 . 22 . 24 . 26 . 28 . 30 . 32 . 34 . 36 . 38 ), in particular according to one of the preceding claims, characterized in that the actual pretreatment stations ( 12 . 14 . 16 . 18 . 20 . 22 . 24 . 26 . 28 . 30 . 32 . 34 . 36 . 38 ) is preceded by a station for hot water cleaning without or with only a very few chemicals. Pre-treatment plant according to claim 13, wherein the Hot water cleaning at a temperature of 60 ° C up to 100 ° C, preferably about 80 ° C, he follows. Pre-treatment plant according to claim 13 or 14, characterized characterized in that the hot cleaning zones are designed as spraying and / or immersion stations with or without ultrasound support. Pre-treatment plant according to one of the preceding claims, characterized in that racks for receiving the parts ( 54 ) to which the parts ( 54 ) are placed so that they are not visibly scratched at later mounted tires. Pre-treatment plant for the pretreatment of parts ( 54 ), in particular for the pretreatment of special rims (high-gloss rims), with a plurality of pretreatment stations ( 12 . 14 . 16 . 18 . 20 . 22 . 24 . 26 . 28 . 30 . 32 . 34 . 36 . 38 ), in particular according to one of the preceding claims, with a drying station at the end of the pretreatment plant, and with at least one intermediate drying station in the region of a pretreatment stage. Pre-treatment plant according to claim 17, in which the Intermediate drying station of a rinsing station or a VE rinsing station downstream of the respective pretreatment stage. Pre-treatment plant according to one of claims 17 or 18, in which the intermediate drying station of a pre-cleaning station downstream with an ultrasonic station or a high-pressure cleaning station is. Process for pretreating parts ( 54 ), in particular for the pretreatment of special rims (high-gloss rims), in which the parts ( 54 ) by a plurality of pretreatment stations ( 12 . 14 . 16 . 18 . 20 . 22 . 24 . 26 . 28 . 30 . 32 . 34 . 36 . 38 ), the parts ( 54 ) at least in one of the pretreatment stations ( 12 . 14 . 16 . 18 . 20 . 22 . 24 . 26 . 28 . 30 . 32 . 34 . 36 . 38 ), preferably in a degreasing station ( 16 ) are cleaned by means of ultrasound in a dipping bath. Method according to Claim 20, in which the parts ( 54 ) are designed as bright-turned rims and with their glossy turned side ( 56 ) at an ultrasonic source ( 58 ) of the ultrasonic device are moved along, preferably at a distance from 10 to 50 cm, more preferably from 15 to 30 cm. Process for pretreating parts ( 54 ), in particular for the pretreatment of special rims (high-gloss rims), in which the parts ( 54 ) by a plurality of pretreatment stations ( 12 . 14 . 16 . 18 . 20 . 22 . 24 . 26 . 28 . 30 . 32 . 34 . 36 . 38 ) and dried at the end of the pretreatment process, in particular according to claim 17 or 18, wherein the parts ( 54 ) are subjected to a preliminary cleaning of an intermediate drying. The method of claim 22, wherein the parts in the intermediate drying to a part temperature of more than 100 ° C are heated, preferably to a temperature in the range of about 105 to 140 ° C, preferably for at least 5 minutes, especially preferred for at least 10 minutes. A method according to claim 22 or 23, wherein the Pre-cleaning by means of ultrasonic support or by means of a high-pressure cleaning he follows.