JP2010201337A - Coating film repairing method and coating film repairing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating film repairing method and a coating film repairing device which have excellent cooling performance and can control the temperature increase of a coating film. <P>SOLUTION: The coating film repairing device 100 has a polishing means 110 for smoothing a part to be repaired 44 having a mark 46 of removal of foreign matter adhering to the surface 42 of the coating film by polishing, and a cooling mechanism 160 for cooling the part to be repaired 44 during polishing. The cooling mechanism 160 jets cooling air, which has a lowered temperature and is in a dew point, toward the part to be repaired 44 during polishing. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a coating film repair method and a coating film repair apparatus.

  In the painting process, when a foreign substance adhering to the surface of the coating film is found, repair is performed. The repair repair includes, for example, a step of removing foreign matter using sanding paper and a polishing step of smoothing the removal trace of foreign matter using a polisher. In the polishing step, the temperature of the coating film surface rises to 50 to 60 ° C. due to frictional heat generated during polishing by the polisher, and the coating film softens, thereby reducing the efficiency of the polishing operation. Therefore, by polishing while cooling the coating film surface, the coating film is prevented from being softened and the efficiency of the polishing operation is suppressed from decreasing (for example, see Patent Document 1).

JP 2006-26475 A

  However, the cooling of the coating film surface applies polisher exhaust air and cold insulation material, and there is a limit to the cooling performance, and if the polishing operation is prolonged, it is difficult to suppress the temperature rise of the coating film surface, for example, It is necessary to temporarily stop the polishing operation and wait for the temperature of the coating surface to decrease, and it is difficult to shorten the overall operation time.

  The present invention has been made in order to solve the problems associated with the prior art described above, and provides a coating film repair method and a coating film repair apparatus that have good cooling performance and can suppress the temperature rise of the coating film. The purpose is to do.

  The uniform phase of the present invention for achieving the above object is a coating film repairing method for polishing and smoothing a repaired part having a removal mark of foreign matters adhering to the coating film surface. In the present coating film repairing method, during the polishing, the cooling air whose temperature is lowered and in the dew point state is jetted toward the repaired part being polished.

  Another aspect of the present invention for achieving the above object is that polishing means for smoothing a repaired part having a removal mark of foreign matter adhering to the coating surface by polishing, and the repaired part being polished. And a cooling mechanism for cooling the coating film. Further, the cooling mechanism injects cooling air having a dew point state at a reduced temperature toward the polished repaired part.

  According to the coating film repair method according to the uniform phase of the present invention and the coating film repair device according to another uniform phase, the cooling air injected to the repair site is in a low temperature and dew point state, and heat transfer with the repair site is performed. In addition to the cooling function by, it has a cooling function by evaporation of contained water (evaporation heat) and has a good cooling performance, so it removes friction heat due to polishing of the repaired part and raises the temperature of the repaired part Can be reliably suppressed. That is, it is possible to provide a coating film repair method and a coating film repair apparatus that have good cooling performance and can suppress the temperature rise of the coating film.

It is the schematic for demonstrating the coating-film repair apparatus which concerns on Embodiment 1. FIG. It is a side view for demonstrating the polisher shown by FIG. It is sectional drawing for demonstrating the removal process of the coating-film repair method which concerns on Embodiment 1. FIG. It is sectional drawing for demonstrating the coating-film surface at the time of completion of a removal process. It is sectional drawing for demonstrating the grinding | polishing process following a removal process. It is a graph for demonstrating the temperature change of the coating surface in a grinding | polishing process. It is the schematic for demonstrating the coating-film repair apparatus which concerns on Embodiment 2. FIG. It is a side view for demonstrating the coating-film repair apparatus which concerns on Embodiment 3. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic diagram for explaining a coating film repair apparatus according to Embodiment 1. FIG.

  A coating film repair apparatus 100 according to Embodiment 1 includes a polisher (polishing means) 110 for smoothing a repaired part 44 having a removal mark 46 of a foreign substance adhering to a coating film surface 42 after painting by polishing. A cooling mechanism 160 for cooling the repaired part 44 being polished.

  The object to be coated 10 is a body of an automobile, and for example, pretreatment (degreasing and chemical conversion treatment) is performed before painting. The coating film comprises an undercoat coating film 20, an intermediate coating film 30, and a top coating film 40. The undercoat coating film 20 is formed by electrodeposition coating or powder coating, and has a function of improving the adhesion between the article to be coated 10 and the coating film. The undercoat paint is, for example, a cation type electrodeposition paint or a powder paint having an epoxy resin or a polyester resin as a main resin. The intermediate coating film 30 is formed by air spraying, airless spraying, or electrostatic coating, and has a function of surface adjustment for compensating for defects in the undercoating coating film and improving the appearance of the top coating finish. The intermediate coating is, for example, a solvent-type, water-based, non-aqueous, or high solid type paint.

  The top coat film 40 is formed by air spray, airless spray, or electrostatic coating, and has a function of imparting aesthetics and durability to the environment (such as weather resistance, chemical resistance, and wear resistance). The top coat is made of a paint with improved scratch resistance, and includes a self-healing clear # 200 manufactured by Sumitomo 3M Limited. As the top coat, a solid color paint, a metallic paint, a normal clear paint, or a combination thereof can be used. The coating film is not limited to a three-layer structure.

  The foreign matter is relatively small dust or dust. The removal mark 46 is, for example, a scratch formed by sanding paper when removing foreign matter.

  The cooling mechanism 160 has an external air piping system 165, an adjusting device 170, and an internal air piping system 150, and injects cooling air whose temperature is lowered and in a dew point state toward the repaired portion 44 that is polished. Used for. The external air piping system 165 is used to introduce high-pressure (compressed) cooling air supplied from the external air source 190 into the adjusting device 170.

  The adjusting device 170 is composed of a cooling device that applies the principle of a vortex tube that does not use refrigerant or electricity, and is arranged in the middle of the external air piping system 165 between the polisher 110 and the external air source 190 for cooling. Used to bring the cooling air into a dew point state by lowering the temperature of the air. The dew point state is a state in which the amount of water vapor in the cooling air is saturated and condensation occurs. The internal air piping system 150 is disposed inside the polisher 110 and is used to introduce the cooling air that has passed through the adjusting device 170 into the repaired portion 44 that has been polished.

  In the coating film repair apparatus 100, as described above, the cooling air sprayed to the repair site 44 is in a low temperature and dew point state, and in addition to the cooling function by heat transfer with the repair site 44, the contained moisture Since it has a cooling function by the evaporation action (evaporation heat) and has a good cooling performance, it is possible to remove the frictional heat due to polishing of the repaired part 44 and to reliably suppress the temperature rise of the repaired part 44.

  Therefore, for example, the polishing target is made of a paint with improved scratch resistance, and even if it is a top coat film that tends to be softened by heat, the temperature rise is suppressed, and the softening of the paint film is suppressed. Appropriate and efficient polishing can be performed. In addition, since the cooling air replenishes the repaired portion 44 with water, the cooling air also has an effect of preventing the coating surface 42 from being dried during polishing.

  Next, the polisher 110 will be described in detail.

  FIG. 2 is a side view for explaining the polisher shown in FIG.

  The polisher 110 includes a grip 120, a main body 130, a polishing unit 140, and an internal air piping system 150. The grip 120 is used for gripping by an operator and has a connector 122 and a trigger 124 connected to an external air piping system 165.

  The main body 130 has an air motor 132 that is a drive source that is operated by cooling air introduced from the connector 122. That is, since the cooling air also serves as the air for operating the polisher 110 (air motor 132), an independent mechanism for supplying the cooling air becomes unnecessary. The trigger 124 of the grip 120 is operated by an operator and used to adjust the rotation state of the air motor 132.

  The polishing unit 140 includes a backup pad 142, a buff pad 144, and a wool buff (polishing cloth) 146. The backup pad 142 has a through hole and is connected to the output shaft of the air motor 132. The buff pad 144 has a through hole aligned with the through hole of the backup pad 142 and is fixed to the backup pad 142.

  The wool buff 146 is used for polishing the repair site 44 and is exchangeably attached to the buff pad 144. The wool buff 146 is supported by the backup pad 142 and the buff pad 144, is driven by the air motor 132 through the backup pad 142 and the buff pad 144, and is freely rotatable. The wool buff 146 is, for example, SBS hard wool buff 5728 manufactured by Sumitomo 3M Limited.

  The internal air piping system 150 connects the connector 122 of the grip 120, the cooling air path of the air motor 132, the through hole of the backup pad 142, and the through hole of the buff pad 144. Therefore, the cooling air introduced into the polisher 110 from the connector 122 is operated to the wool buff 146 via the through hole of the backup pad 142 and the buff pad 144 communicating with the wool buff 146 after the air motor 132 is operated. be introduced. In this case, since the cooling air is directly jetted from the wool buff 146 polishing the repair site 44 to the coating film surface 42, the cooling efficiency can be improved.

  The through holes of the backup pad 142 and the buff pad 144 are preferably located at the center, but are not particularly limited. It is also possible to provide a plurality of through holes. Furthermore, it is also possible to arrange a nozzle for injecting cooling air outside the backup pad 142 and the buff pad 144 without providing a through hole.

  In addition, the coating material which comprises a coating film is not limited to the coating material which improved the scratch resistance. The drive source of the polisher 110 is not limited to an air motor, and an electric motor can be used.

  Next, the coating film repair method according to Embodiment 1 will be described.

  3 is a cross-sectional view for explaining the removal process of the coating film repair method according to Embodiment 1, FIG. 4 is a cross-sectional view for explaining the coating film surface when the removal process is completed, and FIG. FIG. 6 is a schematic diagram for explaining the polishing process following the process, and FIG. 6 is a graph for explaining the temperature change of the coated surface in the polishing process.

  The coating film repair method according to the first embodiment generally polishes a removal step of removing the foreign matter 50 attached to the coating surface 42 after the coating is completed, and a repair site 44 having a removal mark 46 of the foreign matter 50. A polishing step for smoothing, and in the polishing step, cooling air that has a reduced temperature and is in a dew point state is sprayed toward the repaired portion 44 that has been polished.

  The cooling air sprayed to the repair site 44 is at a low temperature and in the dew point state, and has a cooling function by evaporation of moisture (evaporation heat) in addition to a cooling function by heat transfer with the repair site 44. And since it has favorable cooling performance, the frictional heat by polishing of the repair site | part 44 can be removed, and the temperature rise of the repair site | part 44 can be suppressed reliably.

More specifically, in the removing step, the foreign matter 50 (see FIG. 3) attached to the coating surface 42 after the painting is completed is removed using sanding paper. As a result, the foreign matter 50 is removed, but the scratches (removal marks) 46 formed by the sanding paper remain as shown in FIG. The particle size of the sanding paper is, for example, # 1500 to # 2500. The foreign object 50 can also be removed by, for example, a knife, and in this case, the removal mark is a scratch formed by the knife.
In the polishing process, the operator holding the grip 120 of the polisher 110 positions the wool buff 146 of the polisher 110 at the repair site 44 having the removal mark 46. A pasty abrasive containing fine abrasive particles is applied to the repair site 44 or the wool buff 146. The abrasive is, for example, Finishing Compound PN13084 manufactured by Sumitomo 3M.

  By operating the trigger 124 while gripping the grip 120, the number of rotations of the wool buff 146 is set to an appropriate value. Then, while rotating the wool buff 146, as shown in FIG. 4, the repair part 44 having the removal mark 46 is centered and the entire area including the periphery is pressed. Since the wool buff 146 rotates while the abrasive particles are interposed between the wool buff 146 and the repair site 44, the removal trace 46 of the repair site 44 is smoothed.

  On the other hand, the drive source of the wool buff 146 is an air motor 132 and is operated by cooling air introduced from the external air source 190 to the connector 122 of the polisher 110 via the external air piping system 165. The temperature and humidity of the cooling air are adjusted by the adjusting device 170, and the temperature is lowered and in the dew point state. After the air motor 132 is operated, the cooling air is jetted toward the repaired portion 44 being polished. Thereby, the frictional heat due to polishing in the repaired part 44 is caused by the cooling function by the evaporation action (evaporation heat) of the moisture contained in the cooling air in addition to the cooling function by the heat transfer between the cooling air and the repaired part 44. It is removed and the temperature rise of the repair site 44 is reliably suppressed.

  For example, as shown in FIG. 6, in the case of the comparative example that does not use the cooling air according to Embodiment 1, the temperature of the coating film surface 42 reaches 60 ° C. in about 15 seconds as the working time elapses. However, in Embodiment 1, it can be maintained at about 35 ° C. Therefore, even if it is a top coating film that is made of a paint with improved scratch resistance and is likely to be softened by heat, the temperature rise is suppressed and the softening of the coating film at the repair site 44 is suppressed. Polishing is performed. In addition, since the cooling air replenishes the repair site 44 with moisture, drying of the coating film surface 42 during polishing is prevented.

  The cooling air is introduced into the through hole of the backup pad 142 after the air motor 132 is operated via the internal air piping system 150 of the polisher 110. The through hole of the backup pad 142 is aligned with the through hole of the buff pad 144. Therefore, the cooling air is introduced into the wool buff 146 via the through hole of the backup pad 142 and the through hole of the buff pad 144. As a result, the cooling air is directly jetted from the wool buff 146 polishing the repair site 44 onto the coating film surface 42, so that the cooling efficiency can be improved. Note that since the cooling air also serves as the air for operating the air motor 132, an independent mechanism for supplying the cooling air is unnecessary.

  As described above, in the coating film repair method and the coating film repair apparatus according to the first embodiment, the cooling air injected to the repair site is in a low temperature and dew point state, and is cooled by heat transfer with the repair site. In addition to the function, it has a cooling function by the evaporation action (evaporation heat) of the contained water and has a good cooling performance, so it eliminates friction heat due to polishing of the repaired part and ensures a temperature rise of the repaired part Can be suppressed. That is, Embodiment 1 can provide a coating film repair method and a coating film repair apparatus that have good cooling performance and can suppress the temperature rise of the coating film.

  Further, since the cooling air also serves as the air for operating the polisher (air motor), an independent mechanism for supplying the cooling air becomes unnecessary. Furthermore, since the cooling air is directly jetted from the wool buff that polishes the repair site to the coating surface, the cooling efficiency can be improved.

  Next, a second embodiment will be described.

  FIG. 7 is a schematic diagram for explaining a coating film repairing apparatus according to the second embodiment.

  The second embodiment relates to the configuration of the adjusting device 170 used for lowering the temperature of the cooling air and setting it to the dew point state. Unlike the first embodiment, the adjusting device 170 shown in FIG. It has a total 172, a hygrometer (measuring means) 173, a cooling device 174, a humidifying device (humidifying means) 176, and a temperature control device (control means) 178.

  The thermometer 172 and the hygrometer 173 are measuring means that are disposed in the vicinity of the cooling air injection port in the internal air piping system 150 of the polisher 110 and are used to measure the temperature and relative humidity of the cooling air. The measured values of the thermometer 172 and the hygrometer 173 are used to calculate a water vapor pressure and obtain a temperature (dew point temperature) at which the water vapor pressure is a saturated water vapor pressure. The dew point temperature can also be directly measured by the dew point temperature.

  The cooling device 174 is disposed in the middle of the external air piping system 165, is located near the connector 122 of the polisher 110, and the temperature of the cooling air introduced into the air motor by the principle of a vortex tube that does not use refrigerant or electricity. Used to lower

  The humidifier 176 is disposed in the middle of the external air piping system 165, is located between the cooling device 174 and the external air source 190, increases the humidity of the cooling air supplied from the external air source 190, and cools it. Used to introduce into device 174. The humidifier 176 has, for example, a heater and a tank in which water is stored, and is configured to generate water vapor that raises the humidity of the cooling air by heating the water with the heater.

  The temperature control device 178 is connected to the thermometer 172, the hygrometer 173, and the humidifier 176, and controls the humidifier 176 according to the measured values of the thermometer 172 and the hygrometer 173, and the dew point state of the cooling air Used to maintain. For example, when the relative humidity is 100%, the dew point temperature of the cooling air matches the temperature of the cooling air, so that the dew point temperature of the cooling air matches the temperature of the cooling air, or for cooling The humidity of the cooling air is increased so that the relative humidity of the air becomes 100%.

  Therefore, even if the humidity of the external air source fluctuates or the outside air humidity is low, the dew point state of the cooling air injected to the repair site is reliably maintained, ensuring stable cooling performance. Is possible.

  In the coating film repair method according to the second embodiment, the humidity of the cooling air introduced into the air motor is increased in accordance with the humidity or dew point temperature of the cooling air sprayed to the repair site, and the cooling Maintain the air dew point condition. Therefore, similarly, it is possible to stably ensure the cooling performance.

  As described above, in the second embodiment, even when the humidity varies in the external air source or the outside air humidity is low, the dew point state of the cooling air injected to the repair site is reliably maintained. Therefore, it is possible to stably secure the cooling performance.

  Next, a third embodiment will be described.

  FIG. 8 is a side view for explaining the coating film repair apparatus according to the third embodiment.

  The third embodiment is generally different from the first embodiment in that it has a hood (heat insulation means), and the hood 180 shown in FIG. 8 covers the periphery of the polisher 110 (around the air motor 132 and the wool buff 146). , Used to insulate the outside air, for example, has a sandwich structure with a heat insulating material sandwiched therebetween. Accordingly, since heat exchange between the cooling air and the outside air is suppressed, the cooling performance (dew point effect and cooling effect) can be improved.

  In the coating film repair method according to the third embodiment, the air for cooling is polished in a state in which the periphery of the polisher 110 (around the air motor 132 and the wool buff 146) is covered with the hood 180 and insulated from the outside air. It injects toward the repair site | part 44 currently made. Therefore, similarly, it is possible to improve the cooling performance.

  As described above, in the third embodiment, since heat exchange between the cooling air and the outside air is suppressed, the cooling performance (dew point effect and cooling effect) can be improved.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims. For example, the object to be painted is not limited to the body of an automobile. Moreover, the coating film to be repaired is not limited to the top coating film, and can be applied to the intermediate coating film. Further, the buff is not limited to a wool buff.

10 Objects to be painted
20 Undercoat film,
30 Intermediate coating film,
40 Top coat film,
42 Coating surface,
44 Repair site,
46 Removal trace,
50 foreign matter,
100 coating film repair device,
110 Polisher (polishing means),
120 grips,
122 connector,
124 trigger,
130 body,
132 Air motor,
140 polishing section,
142 Backup pad,
144 buff pad,
146 Wool buff,
150 Internal air piping system,
160 cooling mechanism,
165 External air piping system,
170 adjustment device,
172 thermometer,
173 Hygrometer (measuring means),
174 cooling device,
176 humidifier (humidifier),
178 temperature control device (control means),
180 food (heat insulation means)
190 External air source.

Claims (10)

  When the repaired part having the removal mark of the foreign matter adhering to the coating film surface is polished and smoothed, the cooling air whose temperature is lowered and in the dew point state is sprayed toward the polished repaired part. A coating film repair method characterized by The repair part having the removal mark of the foreign matter is polished by a buff driven by an air motor,
The coating air repair method according to claim 1, wherein the cooling air is sprayed toward the repaired part that has been polished after the air motor is operated.   The humidity of the cooling air introduced into the air motor is increased according to the humidity or dew point temperature of the cooling air injected to the repair site, and the dew point state of the cooling air is maintained. The coating-film repair method of Claim 2.   The coating air according to claim 2 or 3, wherein the cooling air is introduced into the buff through a through-hole of a pad that supports the buff and is rotationally driven by the air motor. Membrane repair method.   The air around the air motor and the buff is covered with a heat retaining means, and the cooling air is sprayed toward the repaired part that is polished while being insulated from the outside air. The coating film repair method according to any one of 4. Polishing means for smoothing a repair site having a removal trace of foreign matter adhering to the coating surface by polishing,
A cooling mechanism for cooling the repaired part being polished,
The said cooling mechanism injects the cooling air in which a temperature falls and is in a dew point state toward the said repairing part currently polished. The coating-film repair apparatus characterized by the above-mentioned. The polishing means includes
A rotatable buff for polishing the repair site;
An air motor for rotationally driving the buff;
An internal air piping system for introducing the cooling air into the air motor;
The coating film repairing apparatus according to claim 6, comprising: The cooling mechanism is
Measuring means for measuring the humidity or dew point temperature of the cooling air sprayed to the repair site;
Humidifying means for increasing the humidity of the cooling air introduced into the air motor;
Control means for controlling the humidity adjusting means so that the dew point state of the cooling air is maintained according to the humidity or dew point temperature measured by the measuring means;
The coating film repairing apparatus according to claim 7, comprising: A pad that supports the buff and is rotationally driven by the air motor;
The pad has a through hole communicating with the buff;
The coating film repairing apparatus according to claim 7 or 8, wherein the cooling air is introduced into the buff through the through hole.   The coating film repairing apparatus according to any one of claims 6 to 9, further comprising a heat retaining unit that covers the periphery of the polishing unit and insulates from the outside air.

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