JP2002275692A - Cleaning equipment for treatment before coating, and cleaning method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove deposits before coating by spraying an always fine surface conditioning liquid to a material to be coated. SOLUTION: A cab 3 is immersed into a surface treating liquid vessel 2 and is rested for a prescribed time and thereafter the cab 3 is pulled up by a lifter 8 and the supernatant 5 of the surface conditioning liquid 1 not containing settled deposits 4 is inhaled by a second pump 12. This supernatant 5 is sprayed to the cab 3 from a nozzle 13 to flush away the settled deposits 4, such as dust and foreign matter, sticking to the cab 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pre-coating / cleaning apparatus and a cleaning method for removing extraneous matter such as dust adhering to an object before painting.

[0002]

2. Description of the Related Art For example, prior to electrodeposition coating on an iron plate of an automobile body or the like, foreign matters such as dust (metal powder generated by spattering, welding, cutting, etc.), foreign matter, oil and fat, etc. attached to the iron plate are removed. Pre-painting treatment is performed.

[0003] Such pre-coating treatments provide degreasing treatment for removing oil components such as rust-preventive oils, lubricants, and cutting agents adhering to the metal surface, and imparting rust-preventive properties and paint adhesion to the metal surface. Chemical treatment, surface conditioning treatment as a base treatment performed before the chemical conversion treatment, and washing (water washing) treatment for removing dust and foreign matter such as metal powder attached to the metal surface.

[0004] Until now, pre-coating treatment has been performed in the order of pre-cleaning treatment, degreasing treatment, surface conditioning treatment, and chemical conversion treatment to remove foreign matter and foreign substances adhering to the metal surface before painting. Therefore, the coating quality in the next coating process is improved.

[0005]

However, it is difficult to remove all the deposits such as dusts of high specific gravity such as iron powder and foreign matter even if the above-mentioned treatments are performed. For this reason, it is necessary to remove the deposits contained in the coating film. However, if the coating film is simply scraped, the rust prevention and appearance are impaired, and the coating quality is deteriorated.

Therefore, the present invention is to remove as much as possible foreign substances such as dust and foreign substances adhering to an object to be coated in a pre-coating treatment step,
Finally, it is an object of the present invention to provide a coating pretreatment cleaning device and a cleaning method capable of improving the quality of a coating film.

[0007]

Means for Solving the Problems The present inventor has made intensive studies and found that in the surface conditioning treatment step, which is a step prior to the chemical conversion treatment for increasing the adhesion between the coating film and the iron plate, the substance adheres to the object to be coated. By removing extraneous matter such as dust and foreign matter,
The inventors have found that the removal of extraneous substances can be greatly reduced, and have reached the present invention.

[0008] That is, in the chemical conversion treatment step, since deposits such as dust are often captured in the chemical conversion film,
Even if it is washed after the chemical conversion treatment step, it is difficult to remove the deposits. Therefore, it is desired to remove the deposit in the surface conditioning treatment step before the deposit is captured in the chemical conversion coating. The conventional surface conditioning treatment is merely immersion of the object to be coated in a surface conditioning liquid, but in the present invention,
When the object to be coated is immersed in the surface conditioning liquid and allowed to stand for a predetermined period of time to settle and remove the adhered substance. Then, the object to be coated is sprayed to remove extraneous matter such as dust and foreign matter.

The cleaning device includes a tank filled with a surface conditioning liquid, a driving mechanism for dipping in the surface conditioning liquid and pulling up from the surface conditioning liquid, and a surface conditioning apparatus that sediments attached to the object to be coated are settled and removed. It comprises a means for sucking the supernatant of the liquid and a means for spraying the supernatant onto the object to be coated pulled up from the surface conditioning liquid. In addition, a sedimentation tank is provided for temporarily holding the supernatant of the surface conditioning liquid sucked by the suction means.

The drive mechanism for lifting the object to be coated is not particularly limited, and a general mechanism using a lifter or the like can be used. A pump or the like is used as a means for sucking the supernatant. As the spraying means, means for spraying from a nozzle can be adopted. As a spraying form,
For example, a large amount of surface conditioning liquid is sprayed by a shower (flood type). In addition, as much as possible, the attached material is dropped by spraying at a high flow rate.

Further, when spraying the supernatant, the drive mechanism is provided with a tilt movable mechanism, and the supernatant is sprayed by tilting a hard-to-remove portion attached to the top surface of the object to be coated by the tilt movable mechanism.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.
In the present embodiment, the present invention is applied to a cleaning apparatus and a cleaning method used in a processing step before coating an automobile body as an object to be coated. <Coating pre-treatment cleaning device> FIG. 1 is a schematic diagram showing a state before the cab is immersed in the surface conditioning liquid, FIG. 2 is a schematic diagram showing a state where the cab is immersed in the surface conditioning liquid and allowed to stand, and FIG. FIG. 3 is a schematic view showing a state in which the supernatant of the surface conditioning liquid containing no attached matter is sprayed.

FIG. 1 shows a pre-coating / cleaning apparatus according to this embodiment.
As shown in FIG. 3, a surface treatment liquid tank 2 filled with a surface conditioning liquid 1 and a cab 3, which is an automobile body before painting,
A drive mechanism for immersing in the surface conditioning liquid 1 and pulling up from the surface conditioning liquid 1, a means for sucking the supernatant of the surface conditioning liquid 1 from which the deposits 4 attached to the cab 3 have been settled and removed, and immersion in the surface conditioning liquid 1 A means for spraying the supernatant 5 (see FIG. 3) to the cab 3 which is later pulled up from the surface conditioning liquid 1. “Surface Conditioning Solution and Surface Treatment Solution Tank” The surface conditioning solution 1 is composed of a titanium colloid solution. Since the surface conditioning liquid 1 does not separate and settle, stirring is unnecessary and handling is good. Then, a surface treatment liquid tank 2 containing the surface conditioning liquid 1
Is a tank in which at least a plurality of cabs 3 can be immersed, as shown in FIG. At the bottom of the surface treatment liquid tank 2, as shown in FIG. 3, there is provided a precipitate removing means 6 for cleaning the deposits 4 adhered to the cab 3 and removing the deposits 4 accumulated on the bottom surface. I have. "Precipitate Removal Means" As shown in FIG. 1, the precipitate removal means 6 is provided with a sediment adsorbing member which can be attached to a discharge port provided on the bottom surface of the surface treatment liquid tank 2, and a sediment accumulated on the bottom surface. It is composed of a mechanism that gathers toward the discharge port. As the precipitate adsorbing member, for example, a magnet basket to which a plurality of bar magnets are attached can be used. As a mechanism to collect sediment,
A pipe provided with a plurality of holes at predetermined intervals is arranged at the bottom of the surface treatment liquid tank 2, and the bottom surface conditioning liquid 1 sucked by the first pump 7 is supplied to the pipe and can be blown out from the plurality of holes. Then, a precipitate (attachment 4) such as metal powder collected at the bottom is collected at an outlet.

The sediment removing means 6 is operated when the washing process is not performed and the washing process is not performed when the sediment collects on the bottom surface by repeating the washing process. The sediment accumulated here is spatter dust generated at the time of spatter welding, high-specific-gravity dust such as cutting chips and iron powder generated in a sharpening process of a welded portion, and is adsorbed by the magnetic force of the magnet. "Driving Mechanism" A driving mechanism for immersing the cab 3 in the surface conditioning liquid 1 and pulling it up from the surface conditioning liquid 1 includes a lifter 8 for positioning and fixing the cab 3 thereon as shown in FIG.
A vertical drive mechanism (not shown) for moving the lifter 8 up and down, and a drive control unit 9 for controlling the drive of the lifter 8
And

The lifter 8 is provided with position fixing means for positioning and fixing the plurality of cabs 3 so as not to move. The lifter 8 has a plurality of arms 10.
A and B are attached, and each arm 10A, 10B
Are independently moved up and down by the drive control unit 9. For this reason, the lifter 8 is not shown in FIGS.
As shown in FIG. 4, the lifter 8 can be moved up and down horizontally, and the lifter 8 can be inclined as shown in FIG. "Suction means" means for sucking the supernatant 5 of the surface conditioning liquid 1 from which the deposits 4 adhering to the cab 3 have been settled and removed, as shown in FIG. An inlet 11 and a second pump 12 for sucking the supernatant 5 of the surface conditioning liquid 1 from which the deposits 4 attached to the cab 3 are settled and removed from the inlet 11.

The suction port 11 is provided at a position where the cab 3 is immersed in the surface conditioning liquid 1 and is allowed to stand for a predetermined time so that at least a high specific gravity 4 Is set at a position where it can sink into the bottom of the surface treatment liquid tank 2 and suck in the supernatant 5 of the surface conditioning liquid 1 containing as little as possible the attached matter 4. Specifically, the position of the suction port 11 is determined by the settling speed of the deposit 4 and the settling time when the cab 3 is immersed in the surface conditioning liquid 1 and settled (settling speed x settling time). .

For example, consider a case where the adhered substance 4 having a particle size of about 60 μm or more, which is a problem in quality, is removed from the surface conditioning liquid 1. The sedimentation velocity of the deposit 4 having a particle size of about 60 μm in the surface conditioning liquid 1 is about 1 cm / sec, and when the time from the start of sedimentation to the start of suction is 4 minutes, the surface conditioning liquid 1 The deposit 4 on the water surface was 1 cm / sec × 4 min ×
Settle to a depth of 60 seconds / minute = 240 cm. A position where the attached matter 4 is not sucked up from the settling surface, for example, 200 cm
If the suction port 11 is provided at a depth of about a degree, the supernatant liquid to be sucked is in a state where only the deposit 4 having a particle size of less than 60 μm and having no problem in quality exists. If the portion where the deposit 4 remains is washed out using the supernatant, the quality defect due to the deposit 4 can be prevented. "Spraying means" A means for spraying the supernatant 5 to the cab 3 is, for example, a nozzle 13. Nozzle 13
The outlet is variable so that the outlet can be positioned at an appropriate position with respect to the cab 3. From this nozzle 13, a large amount of supernatant 5 is sprayed from a so-called hose so as to be discharged. By spraying a large amount with a certain pressure, the deposits 4 attached to the cab 3
Wash off. <Coating pretreatment cleaning method> Next, a description will be given of a cleaning method using the coating pretreatment cleaning apparatus configured as described above. Here, after the vehicle body assembly (assembly of the cab 3) is completed, the cab 3 is pre-cleaned, degreased, washed, surface-adjusted, formed, washed, electrodeposited, baked, semi-painted, and top-coated. In a series of coating processes in which the processes are sequentially performed in this order, cleaning is performed in a surface adjustment process that is a pre-coating process. The specific steps are as follows.

In the surface conditioning treatment step, as shown in FIG. 1, a cab 3 placed and fixed on a lifter 8 is placed in a surface treatment solution tank 2 filled with a surface conditioning liquid 1. Then, as shown in FIG. 2, the cab 3 is allowed to stand in the surface conditioning liquid 1 for a predetermined time. Then, nuclei (titanium colloid) in the titanium colloid liquid as the surface conditioning liquid 1 are adsorbed on the metal surface.
Here, it is only necessary to bring the surface conditioning liquid 1 into contact with the metal surface, and furthermore, since the surface conditioning liquid 1 does not separate and settle, stirring is unnecessary, and the handleability is excellent.

The deposits 4 remaining without being removed in the surface conditioning treatment step after settling for a predetermined time settle on the bottom of the surface treatment liquid tank 2. Then, the surface conditioning liquid 1 containing no attached matter 4
The supernatant 5 is sucked by the second pump 12 and the supernatant 5
Is sprayed on the cab 3 when the lifter 8 is pulled up from the surface conditioning liquid 1 under the control of the drive control unit 9 as shown in FIG.

At this time, a large amount of the supernatant 5 of the surface conditioning liquid 1 is vigorously discharged from the nozzle 13 mainly on the ceiling surface 3a (horizontal surface) of the cab 3 in which the attached matter 4 is particularly difficult to clean. The spraying (shower) timing of the supernatant 5 may be performed while the cab 3 is being pulled up from the surface conditioning liquid 1, or may be performed while the cab 3 is being pulled up from the surface conditioning liquid 1 and stopped.

Then, the deposits 4 such as dust (dust generated by spattering, welding, cutting, etc.), foreign matter, oils and fats, which have adhered to the cab 3, are washed away by the supernatant 5. Therefore, the attached matter 4 attached to the cab 3 can be removed in this washing step, and the attached matter 4 on the ceiling surface 3a, which is particularly difficult to remove dirt, is also washed.

In the pretreatment of the surface conditioning treatment step, since the pre-cleaning treatment, degreasing treatment, and water-washing treatment are performed many times, the amount of the deposit 4 is considerably reduced. Therefore, the amount of the attached matter 4 can be reduced to an extremely small amount that does not affect the coating by this washing.

The deposit 4 washed away by the washing is mainly a metal powder having a higher specific gravity than the surface conditioning liquid 1.
It collects at the bottom of the surface treatment liquid tank 2. For this reason, at the time of non-production,
The deposit 4 is removed by operating the precipitate removing means. Thus, the clean surface conditioning liquid 1 can be always maintained.

As described above, the specific embodiments to which the present invention is applied have been described. However, the present invention is not limited to the above embodiments, and various modifications can be made.

For example, in the above-described embodiment, the lifter 8 is pulled up horizontally when the cab 3 is pulled up. However, as shown in FIG.
Are controlled so that the lifter 8 is inclined and the ceiling surface 3a of the cab 3 is inclined.

As described above, if the ceiling surface 3a of the cab 3 is inclined, the deposits 4 on the ceiling surface 3a which are difficult to drop can be easily removed. In this example, the case where the cab 3 is washed has been described as an example. However, not only the cab 3 but also the dirt that adheres to the object to be coated before coating is removed. Can be washed well.

In addition, a similar effect can be obtained by changing the direction in which the nozzle 13 emits the air instead of tilting the cab 3. Of course, both the cab 3 and the nozzle 13 may be configured to be movable so that a portion to be cleaned can be showered.

Further, in the above-described embodiment, the supernatant 5 of the surface conditioning liquid 1 containing no deposits 4 is directly supplied to the nozzle 13, but as shown in FIG. After the supernatant 5 is once stored in the settling tank 14, the supernatant 5 in the settling tank 14 may be supplied to the nozzle 13 from the vicinity of the liquid level by the third pump 15.

In this way, even if the adhered substance 4 has entered the supernatant 5 due to, for example, that a sufficient standing time cannot be secured due to the relationship with the cycle time of the other steps before and after. Since the deposit 4 sinks to the bottom in the settling tank 14, the supernatant 5 sucked from the third pump 15 can be a more beautiful surface conditioning liquid 1. Therefore, the cab 3, which is an object to be coated, can always be cleaned with the clean surface conditioning liquid 1.

In the above-described embodiment, the cab 3 is used as the object to be coated. However, the present invention is not limited to this. The present invention can be applied if the invention is applied.

[0031]

The present invention is embodied in the form described above, and has the following effects.

According to the pre-coating / cleaning apparatus of the present invention, the adhering substance attached to the object to be coated before settling is settled and removed, and the supernatant of the always-free surface conditioning liquid containing no adhering substance is applied to the object to be coated. By spraying, it is possible to reliably remove the attached matter on the object to be coated.

According to the cleaning method of the present invention, when the object to be coated is pulled up after being immersed in the surface conditioning liquid, the surface is settled and sprayed with a constantly clean surface-adjusting liquid containing no attached matter. Since the deposits having a higher specific gravity than the surface conditioning liquid are removed, the deposits adhering to the object to be coated can be removed, and a high-quality coating film can be formed in the next coating process. .

[Brief description of the drawings]

FIG. 1 is a schematic view showing a state before a cab is immersed in a surface conditioning liquid.

FIG. 2 is a schematic diagram showing a state in which a cab is immersed in a surface conditioning liquid and left standing.

FIG. 3 is a schematic diagram showing a state in which a supernatant of a surface conditioning liquid containing no deposit is sprayed on a cab.

FIG. 4 is a schematic view showing a state in which supernatant is sprayed while the cab is tilted.

FIG. 5 is a schematic view showing an example in which a supernatant is temporarily stored in a settling tank.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Surface adjustment liquid 2 Surface treatment liquid tank 3 Cab (object to be coated) 4 Adhered matter 5 Supernatant 6 Precipitate removal means 7 First pump 8 Lifter 9 Drive control unit 10A, 10B Arm 11 Suction port 12 Second pump 13 Nozzle 14 Settlement tank 15 Third pump

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C25D 17/00 C25D 17/00 K

Claims (3)

[Claims] 1. A surface treatment liquid tank filled with a surface conditioning liquid, a drive mechanism for dipping an object to be coated before painting into the surface conditioning liquid and pulling up from the surface conditioning liquid; Means for inhaling the supernatant of the surface conditioning liquid from which sediment is removed by sedimentation, and means for spraying the supernatant onto the object to be coated which is immersed in the surface conditioning liquid and then pulled up from the surface conditioning liquid. Pre-treatment cleaning equipment. 2. The pre-coating cleaning apparatus according to claim 1, further comprising a settling tank for temporarily storing the supernatant of the surface conditioning liquid sucked by the suction means and allowing the supernatant to stand still. . 3. A step of immersing the object to be coated before coating in a surface treatment liquid tank filled with a surface conditioning liquid; a step of allowing the object to be coated to stand in the surface treatment liquid for a predetermined time; When the supernatant of the surface conditioning liquid from which the deposits attached to the object to be coated are settled and removed is lifted up from the surface conditioning liquid, the surface conditioning liquid is sprayed onto the object to be coated, and the A step of removing deposits having a high specific gravity.