JP5193277B2 - Mirror finish method for painted surface - Google Patents

Description

  The present invention relates to a method for finishing a painted surface of an automobile or a building, and more particularly to a mirror surface finishing method for a painted surface in which a scratched surface is finished into a mirror surface.

  As a method of repairing and mirror-finishing scratches generated on a painted surface of an automobile or the like, for example, a first application step of applying a coating agent containing abrasive particles, fluororesin particles, and silicone oil to the painted surface; The coating agent applied in the first application step is polished onto the coating surface using a wool buff while polishing the coating surface, and the mirror surface base forming step and the coating surface on which the mirror surface base forming step is completed are described above. A second coating step in which a coating agent of the same quality as the coating agent used in the first coating step is applied, and while the coating agent applied in the second coating step is spread on the painted surface using a sponge buff, There is disclosed a method for treating a painted surface, which includes a mirror surface forming step of rubbing fluororesin particles into a coating layer to form a mirror surface ( If example see Patent Document 1).

  In addition, the work generally performed in the repair of scratches on the painted surface and the mirror finish is a first step in which an abrasive containing abrasive grains having an average particle size of 10 to 20 μm is applied to the painted surface for a length. A rough polishing step for polishing with a single action polisher with a wool buff planted with 3-5 mm wool, and a polishing agent containing abrasive grains having an average particle size of 5-10 μm as the second step on the painted surface Apply a polishing agent containing abrasive grains with an average particle size of 0.3 to 5 μm on the coated surface as a third step, and a middle-step polishing step with a single action polisher with a rough sponge buff applied. A polishing process consisting of three processes, a fine polishing process that polishes with a single action polisher with a fine sponge buff attached, is used to repair scratches on the painted surface and mirror finish.

JP 2005-342577 A

  However, since the coating surface treatment method of Patent Document 1 is a coating agent containing abrasive particles, fluororesin particles and silicone oil, it has a coating power on the painted surface, but the polishing power is weak. The depth of scratches of 2 to 3 μm can be removed by polishing the paint film by polishing, but scratches can be removed from the painted surface, but scratches with a depth of 5 to 10 μm can be removed by polishing. There was a problem of remaining without being able to,

  For remaining deep scratches, the coating agent is rubbed to form a smooth painted surface, but the coating surface is oxidized or deteriorated by sunlight or rain, and the coating is rubbed into the deep scratches and buried. There was a problem that the agent peeled off and scratches became apparent on the painted surface.

  Moreover, although patent document 1 has the description of a polisher, the description of a single action polisher or a double action polisher is not seen. Generally, a single action polisher with high rotational force and high polishing power is used, but it takes power to operate this single action polisher, and if the single action polisher is operated incorrectly, it will scratch the painted surface There was a problem that it was difficult to operate.

  As a polishing method to remove deep scratches with a scratch depth of 5 to 10 μm, the roughening polishing process, the medium polishing process, and the fine polishing process are general polishing surface repairing and mirror finishing methods. The three-step scratch repair and mirror finishing method has been implemented.

  When the polishing process is a scratch repair and mirror finishing method comprising three steps of a rough polishing step, a medium polishing step and a fine polishing step, for example, the same painted surface of an automobile must be polished three times. Therefore, there was a problem that work efficiency was wasted and work efficiency was extremely poor.

  In addition, in order to eliminate deep scratches and achieve a mirror finish, there is a problem that the coating film must be scraped off by polishing beyond the depth of the scratches.

  Moreover, since the abrasive | polishing agent and buff which are used by three grinding | polishing processes differ for every process, you have to use 3 types of abrasive | polishing agents and 3 types of buffs. For this reason, three kinds of work such as materials are required, and the work becomes complicated, for example, a replacement work is required for each polishing process. Therefore, there has been a problem that the work cost for repairing a scratch and mirror finishing becomes high.

  In addition, all three polishing processes are polished with a single action polisher. However, since the operation of a single action polisher that rotates at a high speed requires power, if the operation of the single action polisher is mistaken, it will cause new scratches on the painted surface. There is a problem that it is difficult, and only a skilled worker can operate.

  Since the single action polisher is pressed against the paint surface and polished, friction heat is generated on the paint surface. This frictional heat raises the temperature of the paint surface, which causes the problem that the paint film on the paint surface is softened by this high temperature and the paint surface is easily scratched.

  Furthermore, when there are three polishing steps, there is a problem that the risk of accidentally scratching the coating surface during the polishing operation increases.

  Accordingly, an object of the present invention is to provide a paint surface that can mirror-finish a deep scratched coating surface in one polishing process, can easily operate a polisher that is a polishing tool, and can suppress an increase in the temperature of the coating surface during polishing. It is to provide a mirror finishing method.

In order to solve the problem described in “Problems to be Solved by the Invention”, the invention of the mirror surface finishing method of the paint surface according to claim 1 is easy to be pulverized by the polishing force of the polisher to form fine particles and has a Mohs hardness of 2 ~ 6 , using a polishing agent (not including silicone oil) 8 containing abrasive grains 40 having an average particle size of more than 3 to 20 μm, and concentrating wool 4 having a length of 10 to 30 mm to form a disk shape Buff the wool buff 3 planted on the substrate 5 or the buff 63 planted on the disc-shaped substrate by densely gathering the thin line-shaped material 64 made of polyester having a length of 10 to 30 mm. The double action polisher 15 stuck to the sticking base portion 10 comprises a polishing step 2 in which the painted surfaces 20, 21, 22, and 23 of an automobile are polished to form a mirror surface.

The invention of the mirror surface finishing method for a coated surface according to claim 2 is the abrasive grain 40 according to claim 1, wherein the abrasive grains 40 are made to easily break the crystal structure by repeatedly raising and lowering the temperature in the course of manufacturing the abrasive grains. When used as the abrasive grain 40, it is easy to be crushed by the polishing force of the polisher, and the abrasive grain is Mohs hardness 2-6, and the abrasive grain is an abrasive grain having an average grain size of more than 3 to 20 μm.

  A third aspect of the invention of the mirror surface finishing method for a coated surface according to the first or second aspect is characterized in that the abrasive grains 40 are zirconium oxide.

  The invention of the mirror surface finishing method for a coated surface according to claim 4 is the method according to any one of claims 1 to 3, wherein the abrasive (not including silicone oil) 8 contains 10 to 25% by weight of abrasive grains 40, 15-30% by weight of petroleum solvent, 1-5% by weight of surfactant, 1-5% by weight of polyhydric alcohol, 1-5% by weight of thickener, 5-10% by weight of sodium metasilicate, and It comprises an abrasive containing 30 to 50% by weight of water.

  According to the first aspect of the present invention, one type of abrasive 8 is used, one type of buff is used, one type of polisher is used, and polishing step 2 is repaired in one step to repair deep scratches on the surface of the coating 10 μm level. This has the effect of realizing a mirror finish.

  Since the abrasive grains 40 of the abrasive 8 are pulverized and refined from the size at the start of polishing, one type of abrasive grains 40 is used to scrape off the coating surface around deep scratches with large abrasive grains at the start of polishing. In the final stage, there is an effect that the coated surface can be mirror-finished with the fine abrasive grains 42.

  Since the abrasive grains 40 having a Mohs hardness of 2 to 6 are used, the coating surface 20, 21, 22, and 23 are less likely to be scratched because they are substantially the same as the Mohs hardness of the coating film.

  Since the wool buff 3 of wool 4 with a long wool 3 length of 10 to 30 mm is used, the abrasive 8 containing abrasive grains 40, 41, and 42 is easily tangled and adhered to long hair. Even if it is not an action polisher, the double action polisher 15 that performs complicated operations such as up / down, left / right, and rotation can produce an effect of having sufficient polishing power.

  Each long wool 4 invades one after another into the scratch space 6 on the coating surfaces 20 and 21 by complicated operations such as up / down / left / right / rotation of the double action polisher 15. Since it collides with the square-shaped portion 25 on the outer peripheral portion of the scratch and leaves the space portion 6 of the scratch, the coating film 7 on the inner wall 24 of the scratch and the coating film on the angular-shaped portion 25 on the outer peripheral portion of the scratch on the coating surfaces 20 and 21 The effect of scraping off 7 is produced.

  Therefore, the vertical cross-sectional shape of the scratches is substantially V-shaped with a sharp space at the scratch bottom 26 and a rectangular contact point shape with the paint surface 20, and a wide angle space at the scratch bottom 26 and the paint surface 23. Since the contact portion shape is a substantially horizontal shape with a substantially arc shape, even if the coating film 7 is not scraped off to the bottom 26 of the scratch, shadows due to scratch marks do not occur on the painted surface 23 when irradiated with light. The effect is that it becomes difficult to see scratches.

  On the other hand, in the case of short wool of 5-6 mm or less, since the short hairs are densely planted, the wool stands upright straight. For this reason, since the tip of the wool comes into contact with the coating surface 20 at substantially the same height, the coating film 7 is gradually scraped off while the coating surface height after being scraped off by polishing becomes substantially the same height. . Therefore, unless the scraping depth of the coating film 7 is equal to or greater than the depth of the scratch, the scratches on the painted surfaces 20, 51, 52 will not disappear and the painted surface cannot be mirror finished.

  In the case of short wool of 5 to 6 mm or less, the coated surfaces 20, 51, 52, 53 are polished with the vertical hair ends, so that the coated surface is easily scratched. When the hair is long, there is a fluffy feeling even if the wool 4 is dense, and there is an effect that the coating surfaces 20, 55, 56, and 57 are hardly scratched.

  In addition, scratches can be repaired and mirror-finished by using a double action polisher 15 that has a low resistance to the coating surface 20 during polishing, without using a single action polisher that has a high resistance to the coating surface 20 during polishing. The physical load applied to the worker at the time of work is reduced, and there is an effect that the paint surfaces 20, 21, 22, and 23 are not erroneously caused to be damaged due to work mistakes.

  The invention according to any one of claims 2 to 4 has the same effect as the invention according to claim 1.

It is a general | schematic process drawing of the mirror surface finishing method of the coating surface which is this invention. It is a front schematic diagram of a wool buff. It is a partially expanded view of the front schematic view of the wool buff. It is a plane schematic diagram of the buffing base. It is a front schematic diagram of a buff pasting base. It is a thermographic outline figure at the time of grind | polishing using a single action polisher. It is a thermographic outline figure at the time of grind | polishing using a double action polisher. It is a cross-sectional schematic diagram of the flaw part vicinity immediately after the grinding | polishing start of the mirror surface finishing method of the coating surface of this invention. It is a cross-sectional schematic diagram of a flaw part vicinity when it has passed for a while since the grinding | polishing start of the mirror surface finishing method of the coating surface of this invention passed. It is a cross-sectional schematic diagram of the vicinity where there was a scratch at the time of mirror finishing of the mirror finishing method of the painted surface of the present invention. It is a cross-sectional schematic diagram of the vicinity where there was a flaw when the mirror surface of the mirror surface finishing method of the coating surface of this invention was formed. It is a thermography of a muscular strength burden when using a single action polisher, (a) is a figure of the ulnar side carpal flexor of the hand. (B) is a diagram of the triceps surae. (C) is a diagram of the pectoralis major muscle. It is a thermography of a muscular strength burden when using a double action polisher, (a) is a figure of the ulnar carpal flexor of the hand. (B) is a diagram of the triceps surae. (C) is a diagram of the pectoralis major muscle. It is a general | schematic schematic diagram of the change of the coating surface in the case of the conventional general crack repair and mirror surface finishing of a deep V-shaped crack. It is a general | schematic schematic diagram of the change of the coating surface in the case of the crack repair of the conventional this invention of a deep V-shaped crack, and mirror surface finishing.

As shown in FIG. 1, step 1 of the mirror finish method of the coated surface according to the present invention, after carrying out the preparatory work 9, is easily pulverized by the polishing force of the polisher to form fine particles and has a Mohs hardness of 2 to 6 and an average particle size Using a polishing agent 8 containing abrasive grains 40 having a diameter of more than 3 to 20 μm, a wool buff 3 in which wool 4 set to a length of 10 to 30 mm is closely packed and planted on a disk-shaped substrate 5 or long Double action in which fine line-shaped objects 64 made of polyester having a thickness of 10 to 30 mm are closely packed and a thin line-shaped object planting buff 63 planted on a disk-shaped substrate 5 is adhered to the buffing base part 10 The polishing step 2 comprises a polishing step 2 in which the painted surfaces 20, 21, 22, and 23 of the automobile are polished by the polisher 15 to form a mirror surface.

  The composition of the abrasive (not including silicone oil) 8 used is 10-25% by weight of abrasive grains 40, 15-30% by weight of petroleum solvent, 1-5% by weight of surfactant, polyvalent A polishing agent (not including silicone oil) 8 containing 1 to 5% by weight of alcohol, 1 to 5% by weight of thickener, 5 to 10% by weight of sodium metasilicate, and 30 to 50% by weight of water. .

  First, the abrasive grains 40 used in the present invention will be described. The abrasive grains 40 are abrasive grains in which the crystal structure is easily broken by causing phase change by repeatedly raising and lowering the temperature during the manufacturing process of the abrasive grains, and the abrasive grains are used as the abrasive grains. It is easy to grind | pulverize by the upper and lower sides, right and left, and rotational force, and it is an abrasive grain with a Mohs hardness of 2-6 and an average particle diameter of 0.3-20 micrometers.

  Examples of the abrasive grains 40 having the above requirements include zirconium oxide.

  In the case where zirconium oxide is used as the abrasive grains 40, the average particle diameter of the zirconium oxide is 0.3 to 20 μm, preferably 1 to 10 μm at the start of polishing. And then refined to an average particle size of 0.1 to 2 μm. Thus, when zirconium oxide is used as the abrasive grains 40, the size of the zirconium oxide particles is large at the start of polishing, and the crystals are pulverized into fine particles during the polishing process.

  At the start of polishing, as shown in FIG. 8, the coating film 7 is scraped off with a polishing agent 8 containing coarse particles of polishing abrasive grains 40 around the scratches formed on the coating surface 20, and crystals are crushed in the polishing process to form fine particles As shown in FIG. 10, the coating film 7 is scraped with the polishing agent 8 containing the medium-sized abrasive grains 41 as shown in FIG. The mirror surface finish is performed on the coating surface 22 with the abrasive 8 containing the fine abrasive grains 42, and as a result, a mirror-finished coating surface 23 as shown in FIG. 11 is formed.

  Next, the buff used in the present invention will be described with reference to FIG. 2 which is a schematic front view and FIG. 3 which is a partially enlarged view of the schematic front view. The buff mold to be used is a wool buff 3 in which wool 4 having a length set to 10 to 30 mm is closely packed and planted on a disk-shaped substrate 5, or a thin wire made of polyester having a length set to 10 to 30 mm A thin line-shaped object planting buff 63 in which the shaped objects 64 are closely packed and implanted on the disk-shaped substrate 5 is preferable.

  As the length of the thin line shape planted in the buff becomes longer, as shown in FIG. 8, the fine line shape object 64 made of wool 4 or polyester is more likely to enter the deep scratch space 6, and the wool 4 or polyester The abrasive 8 containing the abrasive grains 40 is easily entangled and adhered to the fine line shaped article 64, and the coating film on the inner wall 24 of the scratch is made of the fine line shaped article 64 made of wool 4 or polyester entering the space 6. 7 and the coating film 7 of the square-shaped part 25 with the coating surface part are easily scraped off.

  Next, the polisher will be described. When the double action polisher 15 that moves up and down, left and right, and rotational movement is used for polishing work, the load on the operator's hand, arm, or chest is less than when a single action polisher with only one-direction rotational movement is used for polishing work. Since it can reduce, the effect that a grinding | polishing operation | work can be performed very easily easily arises.

  Since the double action polisher 15 moves up and down, right and left, and rotationally, the fine line-shaped object 64 made of wool 4 or polyester easily enters and enters the substantially V-shaped space 6 of the scratch on the painted surface 20. Since the thin line-shaped object 64 made of wool 4 or polyester moves up and down, left and right, and rotationally, the coating film 7 on the inner wall 24 of the scratch and the coating film 7 on the corner portion 25 with the coating surface portion can be easily scraped off.

  The shape of the buffing base 10 attached to the double action polisher 15 will be described with reference to FIG. 4 which is a schematic plan view and FIG. 5 which is a schematic front view. A ring-shaped part 13 between the bearing part 11 into which the output shaft of the polisher provided at the center part of the buffing base 10 is inserted and the outer peripheral flange part 12 formed on the outer edge part of the disk shape is recessed in a vertical section. The plate was cut into a thin shape with a plate pressure of 2 to 3 mm, and 6 to 12 weight reduction holes 14 with a diameter of 10 to 15 mm were provided in the thinned ring-shaped portion 13.

  Thereby, with the reduction of the buffing base 10, it is possible to increase the heat release effect of the frictional heat generated on the painted surfaces 20, 21, 22, and 23 during polishing, and the heat release effect increases, resulting in the polishing work. The temperature rise of the coating surfaces 20, 21, 22, and 23 due to frictional heat can be suppressed, the softening of the coating film 7 can be suppressed, and scratches on the coating surface can be made difficult to occur.

  When using a polisher, the ulnar carpal flexor muscle of the hand is used as the muscle used for gripping the polisher, and the triceps surae muscle of the arm and the great pectoral muscle of the chest are used as the muscles used when pressing the polisher. Therefore, when using the conventional single action polisher and when using the double action polisher 15 with the buffing base 10 of the present invention replaced, the ulnar carpal flexor of the hand, the triceps surae muscle of the arm, and The myoelectric potentials of the great pectoral muscles were measured and compared.

  When the conventional single action polisher is used, as shown in FIGS. 12 (a) to 12 (c), the myoelectric potential measurement value is about 0.5 mV in average value and about 1 mV in maximum value. As shown in FIGS. 13 (a) to 13 (c), when the double action polisher 15 in which the buffing base 10 is replaced is used, the myoelectric potential measurement value shows an average value of approximately 0.1 mV, In the case of the present invention, it is shown that the burden on the operator is reduced to 1/5 to 1/10.

  Moreover, the temperature of the coating surface 20 when the coating surface 20 is polished using a conventional single action polisher and when the coating surface 20 is polished using the double action polisher 15 in which the buffing base 10 of the present invention is changed is used. Measured by thermography and compared.

  When the room temperature is 20 ° C. and the temperature at point A of the coating surface 20 is 20 ° C., the case where the surface is polished using a conventional single action polisher is shown in FIG. The maximum value of the temperature is 90.3 ° C. at the point B, and the case where the double action polisher 15 in which the buffing base 10 of the present invention is replaced is used is shown in the thermograph schematic diagram 31 of FIG. It was 22.5 degreeC by C point.

  From the comparison of the temperature measurement results of the thermography 30, 31, almost no generation of frictional heat was observed when polishing was performed using the double action polisher 15 to which the buffing base 10 of the present invention was fixed.

  Next, a method for repairing deep scratches formed on the painted surface by one polishing operation and forming a mirror surface will be described according to the procedure of step 1 of the mirror surface finishing method of the painted surface shown in FIG.

  First, as preparatory work 9 before polishing work, a buffing base 10 of a commercially available double action polisher 15 is removed, a bearing part 11 into which an output shaft of a polisher provided in the center part is inserted, and a disk-shaped outer edge The annular portion 13 formed between the outer peripheral flange portion 12 and the outer peripheral flange portion 12 is cut into a concave shape in a vertical cross section to reduce the plate pressure to 2 to 3 mm, and the reduced annular shape portion 13 has a diameter of 10 to 15 mm. The buffing base 10 provided with 6 to 12 weight reduction holes 14 is fixed to the double action polisher 15.

  At this time, the commercially available double action polisher 15 may be any type, and the shape of the bearing portion 11 into which the output shaft of the polisher of the buffing base 10 is fitted may be changed so as to be adapted to each type.

  Next, the wool buff 3 in which the wool 4 having a length set to 10 to 30 mm is densely packed in the double action polisher 15 in which the buffing base 10 has been replaced and is planted on the disk-shaped substrate 5, or the length A thin line-shaped object 64 made of polyester having a thickness of 10 to 30 mm is closely packed, and a thin line-shaped object-planting buff 63 that is implanted on the disk-shaped substrate 5 is attached.

  Then, for example, the abrasive 8 containing zirconium oxide is applied to the scratched painted surface 20 or applied to the buff portion of the double action polisher 15.

  Then, the double action polisher 15 polishes the coating surface 20 in the flaw repair range or the mirror finish target range, and when the gloss is seen on the coating surface 23 and the mirror surface is formed, the polishing operation is finished. In this way, it is possible to repair and mirror finish the scratches on the paint surface 20 with deep scratches by a single polishing operation.

  The process of repairing the deep scratch and completing the mirror finish will be described with reference to FIGS. FIG. 8 shows the state when the coating film 7 is scraped off with the coarse abrasive grain 40 immediately after the start of polishing, and the state when the coating film 7 is scraped off with the polishing abrasive grain 41 which has become slightly finer after the start of polishing. FIG. 8 shows a state when the coating surface 22 is mirror-finished with the abrasive grains 42 which are fine particles, and FIG. 11 shows a state where the mirror-finishing is finished and a mirror surface is formed on the coating surface 23.

  As shown in FIG. 8, scratches having a substantially V-shaped cross section are present on the painted surface 20. When the coated surface 20 began to be polished with the double action polisher 15, a long wool buff 3 with a polishing agent 8 containing abrasive grains 40 having an average particle size of 1 to 10 μm, which is easily pulverized and finely divided, is attached. The wool 4 enters the space 6 in the V-shape of the scratch and comes into contact with the square-shaped portion 25 that is the contact portion with the coating surface of the scratch. By the movement, the coating film 7 on the inner wall 24 of the scratch and the coating film 7 on the square-shaped portion 25 which is a contact portion with the coating surface are scraped off from a large number of directions with the abrasive grains 40 of the size.

  The polishing does not scrape the coating film 7 to a depth equal to or greater than the depth of the scratch, but scrapes the coating film 7 on the inner wall 24 of the scratch and the coating film 7 on the corner portion 25 that is a contact portion with the coating surface. . Accordingly, the vertical cross-sectional shape of the scratch is changed from a substantially V-shape having an acute space at the scratch bottom 26 as shown in FIG. 26 has a wide angle space and a substantially horizontal shape with a substantially arc shape with a large contact portion with the coating surface 23, so that the coating film 7 is not scraped off beyond the depth of the scratch.

  As the polishing proceeds, as shown in FIG. 9, the height of the coating surface decreases from the initial position of the coating surface 20 to the position of the coating surface 21, and the average particle size of the abrasive grains 40 shown in FIG. 8 gradually increases. It becomes fine particles and becomes abrasive grains 41 smaller than abrasive grains 40. When the coating surface 21 is polished with the abrasive 8 containing the abrasive grains 41 with slightly advanced fine particles, the coating film 7 is further scraped off, and the abrasive grains 41 are further 0.1 to 2 μm as shown in FIG. Fine particles to a particle size of

  As shown in FIG. 10, when the coated surface 22 is polished with the polishing agent 8 containing the abrasive grains 42 in which almost all of the abrasive grains are made into fine particles, a mirror finish is achieved. As shown in FIG. And a mirror surface is formed. Then, even if the coating film 7 is not scraped off to a depth equal to or greater than the depth of the scratch, the coating surface 23 will not be shaded by the scratch bottom 26 when irradiated with light, and the scratch bottom 26 will be difficult to see. .

  Here, the difference between the process of changing the shape of the painted surface 20 by the polishing method of the present invention and the process of changing the shape of the painted surface 20 by a conventional general polishing method for a substantially V-shaped scratch is shown in FIG. This will be described with reference to FIG.

  As shown in FIG. 14, the conventional general polishing method is such that short hairs are densely planted and wool is vertically standing. The coating surface 53 gradually decreases from the height position of the previous coating surface 20 to 51 and 52 at substantially the same height in the horizontal direction, and finally the coating surface height is completely free of scratches having a substantially V-shape. It goes down to the position of more than the depth of the scratch.

  On the other hand, according to the polishing method of the present invention, as shown in FIG. 15, each long wool 4 is subjected to complicated operations such as up / down / left / right / rotation of the double action polisher 15 to paint surfaces 20, 55, 56, 57. The cracks 6 invaded one after another, and the paint film 7 on the flaw inner wall 24 and the paint film 7 on the outer peripheral part of the flaw on the paint surface are scraped off. , 55, 56, and 57, and has a wide-angle space in the scratch bottom 26 and a substantially horizontal shape in which the contact portion shape with the coating surface 57 becomes a substantially arc shape, so that the coating film is scraped to the depth of the scratch. Even if it is not, shadows due to scratch marks do not occur on the painted surface 57 when light is irradiated, and scratches are difficult to see.

  As described above, the coating surface 20 having a deep scratch can be mirror-finished by repairing the scratch by one polishing.

  Next, although an Example is given and this invention is demonstrated, this invention is not limited by an Example.

  First, as a preparation before polishing work, a black-coated automobile was prepared, and the painted surface 20 state of the bonnet of the automobile appeared dull and whitish, and there were many car washing scratches and rubbing scratches. When the depth of 26 of these scratches was measured with a microscope (model 2054-100EM manufactured by PEAK), the depth of the scratch was 0.1 to 10 μm. The Mohs hardness was 2. The bonnet part was washed with a neutral shampoo and the moisture was wiped off with a dry towel.

  A buff pasting base of a commercially available double action polisher (model RSE-1250 made by Ryobi) 15 was removed, and a bearing portion 11 into which an output shaft of a polisher provided in the center portion was fitted, and a disc-shaped outer edge portion were formed. The annular portion 13 between the outer peripheral flange portion 12 is cut into a concave shape in a vertical cross section to reduce the thickness of the plate pressure to 3 mm, and eight weight reduction holes 14 having a diameter of 12 mm are provided in the thinned annular portion 13. The buffing base 10 is fixed by fastening it to the double action polisher 15 with four bolts.

  Next, a wool buff 3 having a diameter of 130 mm, in which wool 4 having a length of 10 to 20 mm is closely packed and planted on a disk-shaped substrate 5 is pasted on the double action polisher 15 in which the base 10 for buffing is replaced. To wear.

  Then, about 0.5 mg of the abrasive 8 containing zirconic oxide is applied to the scratched painted surface 20 or to the wool buff 3 of the double action polisher 15.

  Then, with the double action polisher 15, the coated surfaces 20, 21, 22, and 23 in the flaw repair range and mirror finish target range were polished in the vertical direction or the horizontal direction, and the coated surface 23 was glossed and a mirror surface was formed. After confirming the above, the polishing operation is completed, and the scratch on the coating surface 20 having a deep scratch can be repaired and mirror-finished by a single polishing operation.

  When it was confirmed with a microscope after the polishing operation was completed, all scratches disappeared and a mirror surface was formed while leaving the skin peculiar to the painted surface.

  Further, when the same mirror surface finishing method of the painted surface 20 of the present invention as described above was applied to another automobile hood having a Mohs hardness of 4, the scratch depth of 10 μm disappeared and a mirror surface was formed.

DESCRIPTION OF SYMBOLS 1 Process of mirror surface finishing method of coating surface Polishing process 3 Wool buff 4 Wool 5 Substrate 6 Space part 7 Paint film 8 Abrasive agent 9 Preparatory work 10 Buffing base 11 Bearing part 12 Outer peripheral flange part 13 Ring-shaped part 14 Weight Reduction hole 15 Double action polisher 20 Painted surface 21 Painted surface 22 Painted surface 23 Painted surface 24 Inner wall 25 Square shape part 26 Bottom part 30 Thermograph schematic diagram 31 Thermograph schematic diagram 40 Abrasive grain 41 Abrasive grain 42 Abrasive grain 51 Coated surface 52 Painted surface 53 Painted surface 55 Painted surface 56 Painted surface 57 Painted surface 63 Fine wire shaped planting buff 64 Fine wire shaped material made of polyester A Heat-free position B Maximum temperature position C Maximum temperature position

Claims (4)

A polishing agent (without silicone oil) containing a polishing grain having a Mohs hardness of 2 to 6 and an average particle size of 3 to 20 μm is used. Wool buffs in which wool set to 30 mm is densely planted and planted on a disk-shaped substrate, or fine line-shaped objects made of polyester having a length of 10 to 30 mm are clustered and planted on a disk-shaped substrate. A method of mirror finishing a painted surface, comprising a polishing step of polishing a painted surface of an automobile to form a mirror surface by a double action polisher in which a thin wire-shaped object planting buff is adhered to a buffing base portion.   The abrasive grain is an abrasive grain whose crystal structure is easily broken by repeatedly raising and lowering the temperature in the course of manufacturing the abrasive grain. When used as a polishing grain, the abrasive grain is easily crushed by the polishing force of the polisher, and the Mohs hardness is 2-6. The method for mirror finishing a coated surface according to claim 1, wherein the abrasive grains are abrasive grains having an average grain size of more than 3 to 20 µm.   The method for mirror finishing a coated surface according to claim 1 or 2, wherein the abrasive grains are zirconium oxide.   The abrasive (without silicone oil) is 10-25 wt% abrasive grains, 15-30 wt% petroleum solvent, 1-5 wt% surfactant, 1-5 wt% polyhydric alcohol %, An abrasive containing 1 to 5% by weight of a thickener, 5 to 10% by weight of sodium metasilicate, and 30 to 50% by weight of water. The method of mirror finishing of the painted surface as described.

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