CN110238009B - Workpiece coating repairing method - Google Patents
Workpiece coating repairing method Download PDFInfo
- Publication number
- CN110238009B CN110238009B CN201910574856.2A CN201910574856A CN110238009B CN 110238009 B CN110238009 B CN 110238009B CN 201910574856 A CN201910574856 A CN 201910574856A CN 110238009 B CN110238009 B CN 110238009B
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- coating
- paint
- interface water
- spraying
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- 238000000576 coating method Methods 0.000 title claims abstract description 56
- 239000011248 coating agent Substances 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000003973 paint Substances 0.000 claims abstract description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 42
- 238000005507 spraying Methods 0.000 claims abstract description 29
- 230000008439 repair process Effects 0.000 claims abstract description 23
- 239000000203 mixture Substances 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims abstract description 4
- 239000007921 spray Substances 0.000 claims description 18
- 238000000227 grinding Methods 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 244000137852 Petrea volubilis Species 0.000 claims 2
- 230000007704 transition Effects 0.000 abstract description 15
- 238000005498 polishing Methods 0.000 abstract description 9
- 239000003086 colorant Substances 0.000 abstract description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003085 diluting agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/005—Repairing damaged coatings
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention relates to the field of workpiece coating repair, and discloses a workpiece coating repair method, wherein an original coating (2) and a damaged area (1) are arranged on the surface of a workpiece, and the workpiece coating repair method comprises the following steps: firstly, polishing the damaged area (1) and the expansion area (3); secondly, spraying repair paint which is made of the same material as the original coating (2) on the damaged area (1); thirdly, after the refinishing paint is leveled for a preset time, spraying a mixture of the refinishing paint and interface water on the inner ring of the expansion area (3); and fourthly, spraying interface water on the outer ring of the expansion area (3), and drying and curing the interface water to form a dry film. Through the technical scheme, the areas for spraying the refinishing paint and the interface water and the areas for spraying the interface water between the refinishing paint and the original coating realize the transition of two levels of colors between the refinishing paint and the original coating, so that the color transition is smoother and more easily accepted by vision.
Description
Technical Field
The invention relates to the field of workpiece coating repair, in particular to a workpiece coating repair method.
Background
In the existing coating process of engineering machinery, the finish painting assembly of parts is mainly used basically. In use, when the painted surface of the component is partially damaged, the original finish paint is needed for repairing. In order to reduce the color difference between the old coating and the new coating, the damaged part of the old coating is directly ground during repair, then a layer of repair paint is firstly sprayed on the central area, and then a layer of interface water is sprayed on the edge of the repair paint, so that the repair paint is slowly transited to the old coating, and the color difference between the new coating and the old coating is controlled within a visual acceptable range as much as possible. However, in the actual production process, the repairing effect is general, and particularly for the gorgeous color, the color difference of the new coating and the old coating after repairing is still obvious.
Disclosure of Invention
The invention aims to provide a workpiece coating repairing method to solve the problem that color transition between new and old coatings is not smooth enough.
In order to achieve the above object, the present invention provides a method for repairing a coating on a workpiece, the workpiece having a surface provided with a raw coating and a damaged area formed on the raw coating, wherein the method for repairing a coating on a workpiece comprises:
polishing the damaged area and an expansion area surrounding the damaged area;
secondly, spraying repair paint which is made of the same material as the original coating on the damaged area;
after the refinishing paint is leveled for a preset time, spraying a mixture of the refinishing paint and interface water on the inner ring of the expansion area;
and fourthly, spraying interface water on the outer ring of the expansion area, and drying and curing the interface water to form a dry film.
Optionally, in step one, in the damaged area and the expanded area, a rough grinding is performed by using 200 # sandpaper and then a fine grinding is performed by using 400 # sandpaper in a direction from the center to the outside.
Optionally, in step two, the refinish paint is 1 second to 2 seconds less than the paint-4 cup detected viscosity of the material forming the original coating.
Optionally, in the second step, the refinish paint is sprayed by using a spray gun with a caliber of 1.0mm-1.5mm, and the spraying path is from outside to inside, from left to right, and from top to bottom at the damaged area.
Alternatively, in step three, the predetermined time is 10 minutes to 15 minutes.
Optionally, in the third step, the mixture of the refinishing paint and the interface water is prepared from 2: 3-3: 2, mixing the refinishing paint with the interface water, and standing for 5-10 minutes, wherein the viscosity of the mixture of the refinishing paint and the interface water is 12-16 seconds when the mixture is coated in a 4-cup manner.
Optionally, in the third step, a spray gun with the caliber of 1.0mm-1.5mm is used for spraying the mixture of the refinishing paint and the interface water, and the spraying paths are from outside to inside, from left to right and from top to bottom at the inner ring.
Optionally, in step four, the interface water is sprayed using a 1.0mm to 1.5mm bore spray gun.
Optionally, the width of the expansion area is 100mm-150mm, the width of the inner ring of the expansion area is 50mm-80mm, and the width of the outer ring of the expansion area is 50mm-70 mm.
Optionally, the thickness of the dry film is 35um-40 um.
Through the technical scheme, the areas for spraying the refinishing paint and the interface water and the areas for spraying the interface water between the refinishing paint and the original coating realize the transition of two levels of colors between the refinishing paint and the original coating, so that the color transition is smoother and more easily accepted by vision.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic illustration of a region of a workpiece surface according to an embodiment of the invention;
FIG. 2 is a schematic illustration of a region of a workpiece surface according to an embodiment of the invention;
FIG. 3 is a cross-sectional view of a surface of a workpiece according to an embodiment of the invention;
FIG. 4 is a schematic view of a spray path according to one embodiment of the present invention;
FIG. 5 is a schematic view of a spray path according to another embodiment of the present invention.
Description of the reference numerals
1 damaged area 2 Primary coating
3 extension area
31 inner ring 32 outer ring
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The invention provides a workpiece coating repairing method, wherein the surface of a workpiece is provided with an original coating 2 and a damaged area 1 formed on the original coating 2, and the workpiece coating repairing method comprises the following steps:
firstly, polishing the damaged area 1 and an expansion area 3 surrounding the damaged area 1;
secondly, spraying repair paint which is made of the same material as the original coating 2 on the damaged area 1;
thirdly, after the refinishing paint is leveled for a preset time, spraying a mixture of the refinishing paint and interface water on the inner ring 31 of the expansion area 3;
and fourthly, spraying interface water on the outer ring 32 of the expansion area 3, and drying and curing the interface water to form a dry film.
In the scheme, the damaged area 1 and the periphery thereof are polished, the damaged area 1 and the original coating 2 around the damaged area are polished, an expansion area 3 (shown in fig. 1) surrounding the damaged area 1 is formed, the expansion area 3 is in a ring shape or a frame shape and comprises an inner ring 31 and an outer ring 32 (shown in fig. 2 and fig. 3), and the expansion area 3 is a transition area between the refinishing paint at the damaged area 1 and the original coating 2, so that a more moderate color transition is formed between the damaged area 1 and the original coating 2.
Wherein, the damaged area 1 is sprayed with refinishing paint which is made of the same material as the original coating 2, so that the colors of the two parts are as close as possible; in the expansion area 3, as shown in fig. 2 and 3, a mixture of the repair paint (the same as the repair paint in the damage area 1) and interface water is sprayed at the inner ring 31, which is a first layer of transition, and interface water is sprayed at the outer ring 32 to form a dry film, which is a second layer of transition, i.e., the newly sprayed repair paint is transited to the original coating 2 through two layers of transition, so that the color transition is more gradual and the color transition is more easily accepted visually.
Optionally, in step one, in the damaged area 1 and the expanded area 3, a coarse grinding is performed by using 200 # sandpaper, and then a fine grinding is performed by using 400 # sandpaper in a direction from the center to the outside. That is, the polishing method is from the center to the outside, and two times of polishing, i.e., rough polishing and fine polishing are performed, the rough polishing being performed using No. 200 abrasive paper, and the fine polishing being performed using No. 400 abrasive paper.
In addition, in the second step, the refinish paint is lower than the viscosity of the paint-4 cup detection of the material forming the original coating 2 by 1 second to 2 seconds. The smear-4 cup test is performed by measuring the time, expressed in seconds, when a quantitative sample flows out of a hole having a predetermined diameter under a constant temperature condition. The viscosity of the used refinishing paint is 1-2 seconds lower than the viscosity detected by a paint-4 cup when the original coating 2 is formed, namely, the refinishing paint is made of the same material as the original coating but has lower viscosity, so that the refinishing paint has higher fluidity, can exchange substances with the adjacent expansion area 3, weaken the boundary between the damage area 1 and the expansion area 3 and improve the smoothness of transition.
Optionally, in the second step, a spray gun with a caliber of 1.0mm-1.5mm is used for spraying the refinish paint, and the spraying path is from outside to inside, from left to right, and from top to bottom in the damage area 1. In the present embodiment, a 1.0mm-1.5 mm-caliber spray gun is used to spray the repair paint on the damaged area 1 to complete the repair, wherein the spraying path is from outside to inside, from left to right, and from top to bottom, and the spraying path refers to the moving path of the spray gun, and can be referred to the arrow in fig. 4 and 5, wherein the numbers represent the sequence, which is different from the numbers in fig. 1-3.
In addition, in the third step, the predetermined time is 10 minutes to 15 minutes. The leveling aims to volatilize volatile gas in a solvent in the refinishing paint on the surface of the workpiece within a certain time, and the wet paint film can be leveled while the volatile gas volatilizes, so that the flatness and the glossiness of the paint film are ensured. In the scheme, the leveling time of the refinishing paint is 10 minutes to 15 minutes.
In addition, in the third step, the mixture of the refinishing paint and the interface water is prepared from the following components in a weight ratio of 2: 3-3: 2, mixing the refinishing paint with the interface water, and standing for 5-10 minutes, wherein the viscosity of the mixture of the refinishing paint and the interface water is 12-16 seconds when the mixture is coated in a 4-cup manner. The weight ratio of the refinishing paint to the interface water for forming the mixture is 2: 3 to 3: 2, preferably 1: 1, the mixture of the repair paint and the interface water is sprayed on the inner ring 31 of the expansion area 3, so that the repair paint in the damage area 1 can be transited to the interface water of the outer ring 32, and the transition level is increased, so that the transition is more gradual.
Optionally, in step three, the mixture of refinish paint and interface water is sprayed by using a spray gun with a caliber of 1.0mm to 1.5mm, and the spraying path is from outside to inside, from left to right and from top to bottom on the inner ring 31. The refinish paint and interface water mixture is sprayed similar to the spray path at the damaged area 1, as can be seen in fig. 4 and 5 with the arrows, and the tool used for spraying is also a 1.0mm to 1.5mm caliber spray gun.
Wherein, in the fourth step, a spray gun with the caliber of 1.0mm-1.5mm is used for spraying the interface water. The interface water is a diluent and can be used for the color-finishing treatment of the interface between the new paint film and the old paint film. The tool for spraying the interface water can be a spray gun with the caliber of 1.0mm-1.5 mm. In some embodiments, the refinish paint, refinish paint and interface water mixture, and interface water may be applied using the same caliber application, for example, a 1.0mm caliber spray gun may be used.
Alternatively, the width of the expansion area 3 is 100mm-150mm, the width of the inner ring 31 of the expansion area 3 is 50mm-80mm, and the width of the outer ring 32 of the expansion area 3 is 50mm-70 mm. The expansion zone 3 comprises only the inner ring 31 and the outer ring 32, and depending on the shape of the damaged area 1, for example, circular or rectangular, the expansion zone 3 may be annular or frame-shaped, and the inner ring 31 and the outer ring 32 may also be corresponding annular or frame-shaped, where the width refers to the span from inside to outside, for example, the difference between the inner diameter and the outer diameter of the annular, and the frame-shaped structure is similar.
In addition, the thickness of the dry film is 35um-40 um. Referring to fig. 3, the final thickness of the sprayed material at the damaged area 1 and the expanded area 3 can be consistent with the thickness of the original coating 2.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (9)
1. A method for repairing a coating on a workpiece, the surface of the workpiece being provided with a raw coating (2) and a damaged area (1) formed on the raw coating (2), the method comprising:
firstly, grinding the damaged area (1) and an expansion area (3) surrounding the damaged area (1);
secondly, spraying repair paint which is made of the same material as the original coating (2) on the damaged area (1), wherein the viscosity of the repair paint is 1-2 seconds lower than that of the paint-4 cup detection of the material forming the original coating (2);
thirdly, after the refinishing paint is leveled for a preset time, spraying a mixture of the refinishing paint and interface water on the inner ring of the expansion area (3);
and fourthly, spraying interface water on the outer ring of the expansion area (3), and drying and curing the interface water to form a dry film.
2. The method for repairing a coating on a workpiece according to claim 1, wherein in step one, in the damaged area (1) and the expanded area (3), a rough grinding is performed by using 200-size sand paper, and then a fine grinding is performed by using 400-size sand paper in a direction from the center to the outside.
3. The method for repairing a coating on a workpiece according to claim 1, wherein in step two, the refinish paint is sprayed by using a 1.0mm-1.5mm caliber spray gun, and the spraying path is from outside to inside, from left to right, and from top to bottom at the damaged area (1).
4. The method of claim 1, wherein the predetermined time is 10 to 15 minutes in step three.
5. The method for repairing a coating on a workpiece according to claim 1, wherein in step three, the mixture of the repair paint and the interface water is prepared from the following components in a weight ratio of 2: 3-3: 2, mixing the refinishing paint with the interface water, and standing for 5-10 minutes, wherein the viscosity of the mixture of the refinishing paint and the interface water is 12-16 seconds when the mixture is coated in a 4-cup manner.
6. The method for repairing a coating on a workpiece according to claim 1, wherein the mixture of refinish paint and interface water is sprayed in step three using a 1.0mm-1.5mm caliber spray gun, the spraying path being from outside to inside, from left to right, and from top to bottom at the inner ring.
7. The method for repairing a coating on a workpiece according to claim 1, wherein in the fourth step, the interface water is sprayed using a 1.0mm-1.5mm caliber spray gun.
8. The workpiece coating repair method according to claim 1, characterized in that the width of the expansion zone (3) is 100mm-150mm, the width of the inner ring of the expansion zone (3) is 50mm-80mm, and the width of the outer ring of the expansion zone (3) is 50mm-70 mm.
9. The method of claim 1, wherein the dry film has a thickness of 35 μ ι η to 40 μ ι η.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910574856.2A CN110238009B (en) | 2019-06-28 | 2019-06-28 | Workpiece coating repairing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910574856.2A CN110238009B (en) | 2019-06-28 | 2019-06-28 | Workpiece coating repairing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110238009A CN110238009A (en) | 2019-09-17 |
| CN110238009B true CN110238009B (en) | 2020-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910574856.2A Active CN110238009B (en) | 2019-06-28 | 2019-06-28 | Workpiece coating repairing method |
Country Status (1)
| Country | Link |
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| CN (1) | CN110238009B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114789127A (en) * | 2021-01-26 | 2022-07-26 | 上海钜轩汽车用品有限公司 | Automobile minimally invasive point paint spraying and repairing method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1608744A (en) * | 2004-03-29 | 2005-04-27 | 郭新军 | Method of repairing local damaged coating on metal surface |
| CN101234378A (en) * | 2008-03-06 | 2008-08-06 | 梅昭志 | Paint surface posthaste photo compensation method |
| CN108944828A (en) * | 2018-06-12 | 2018-12-07 | 广西速道汽车维修服务有限公司 | A kind of method of restoring automobile wheel hub scratch |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6777033B2 (en) * | 2002-03-18 | 2004-08-17 | E. I. Du Pont De Nemours And Company | Process for refinishing substrates |
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2019
- 2019-06-28 CN CN201910574856.2A patent/CN110238009B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1608744A (en) * | 2004-03-29 | 2005-04-27 | 郭新军 | Method of repairing local damaged coating on metal surface |
| CN101234378A (en) * | 2008-03-06 | 2008-08-06 | 梅昭志 | Paint surface posthaste photo compensation method |
| CN108944828A (en) * | 2018-06-12 | 2018-12-07 | 广西速道汽车维修服务有限公司 | A kind of method of restoring automobile wheel hub scratch |
Non-Patent Citations (1)
| Title |
|---|
| "车身面漆涂装修补过程";朱鹏;《现代涂料与涂装》;20121231;第15卷(第12期);第67-69页 * |
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| CN110238009A (en) | 2019-09-17 |
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