CN116422556A - Bicolor coating process applied to exterior coating line - Google Patents
Bicolor coating process applied to exterior coating line Download PDFInfo
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- CN116422556A CN116422556A CN202310351489.6A CN202310351489A CN116422556A CN 116422556 A CN116422556 A CN 116422556A CN 202310351489 A CN202310351489 A CN 202310351489A CN 116422556 A CN116422556 A CN 116422556A
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- 238000000576 coating method Methods 0.000 title claims abstract description 124
- 239000011248 coating agent Substances 0.000 title claims abstract description 116
- 238000005507 spraying Methods 0.000 claims abstract description 157
- 239000002966 varnish Substances 0.000 claims abstract description 127
- 239000002390 adhesive tape Substances 0.000 claims abstract description 91
- 239000003973 paint Substances 0.000 claims abstract description 71
- 238000005498 polishing Methods 0.000 claims abstract description 63
- 230000007547 defect Effects 0.000 claims abstract description 57
- 238000000034 method Methods 0.000 claims abstract description 48
- 230000008569 process Effects 0.000 claims abstract description 37
- 238000009500 colour coating Methods 0.000 claims abstract description 29
- 239000002245 particle Substances 0.000 claims abstract description 15
- 239000002131 composite material Substances 0.000 claims abstract description 10
- 230000005611 electricity Effects 0.000 claims abstract description 5
- 230000003068 static effect Effects 0.000 claims abstract description 5
- 229920001971 elastomer Polymers 0.000 claims abstract description 4
- 230000008439 repair process Effects 0.000 claims description 52
- 238000001816 cooling Methods 0.000 claims description 36
- 238000001035 drying Methods 0.000 claims description 28
- 238000001514 detection method Methods 0.000 claims description 24
- 238000007689 inspection Methods 0.000 claims description 22
- 230000000873 masking effect Effects 0.000 claims description 20
- 239000000428 dust Substances 0.000 claims description 15
- 238000000227 grinding Methods 0.000 claims description 15
- 239000007921 spray Substances 0.000 claims description 15
- 238000011068 loading method Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 239000003595 mist Substances 0.000 claims description 9
- 238000011179 visual inspection Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 230000002378 acidificating effect Effects 0.000 claims description 6
- 238000011010 flushing procedure Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 230000000007 visual effect Effects 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 3
- 238000007590 electrostatic spraying Methods 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 3
- 238000007665 sagging Methods 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 230000037303 wrinkles Effects 0.000 claims description 3
- 238000012797 qualification Methods 0.000 abstract description 9
- 239000002987 primer (paints) Substances 0.000 description 17
- 239000002828 fuel tank Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 8
- 230000008901 benefit Effects 0.000 description 4
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Classifications
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- 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
- B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
- B05D5/065—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects having colour interferences or colour shifts or opalescent looking, flip-flop, two tones
- B05D5/066—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects having colour interferences or colour shifts or opalescent looking, flip-flop, two tones achieved by multilayers
-
- 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
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/32—Processes for applying liquids or other fluent materials using means for protecting parts of a surface not to be coated, e.g. using stencils, resists
- B05D1/322—Removable films used as masks
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- 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
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
- B05D1/38—Successively applying liquids or other fluent materials, e.g. without intermediate treatment with intermediate treatment
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- 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
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
- B05D3/0272—After-treatment with ovens
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- 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
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/56—Three layers or more
- B05D7/58—No clear coat specified
- B05D7/587—No clear coat specified some layers being coated "wet-on-wet", the others not
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
A two-color coating process applied to an exterior coating line, comprising: step S1, spraying for the first time: primer spraying, colored paint A spraying, varnish static electricity and air gun spraying, shielding treatment, wherein a demarcation shielding adhesive tape and shielding paper are adopted during shielding treatment, and the thickness of the demarcation shielding adhesive tape is as follows: 110 microns; elongation at break: 200%; tensile strength: 25N/CM; temperature resistance: 150 ℃; the rubber particles are not dropped when the piece is baked at 90 ℃/30 minutes to remove the adhesive tape; the shielding paper consists of a PVC adhesive tape and a composite high-temperature film, wherein the thickness of the PVC adhesive tape is as follows: 115 microns; peel force: 2.5N/CM; temperature resistance: 150 ℃/2h; elongation percentage: 200%; thickness of the composite high temperature film: 50-60 microns; temperature resistance: 110 ℃/2h; step S2, spraying for the second time: spraying the colored paint A, spraying a varnish air gun, removing shielding, and reducing steps by wet polishing; step S3, third spraying: varnish static electricity + air gun spraying. The double-color coating process can effectively overcome the quality defect of the existing double-color coating and improve the one-time offline qualification rate.
Description
Technical Field
The invention relates to a processing method of automobile parts, in particular to a double-color coating process applied to an exterior coating line.
Background
Under the circumstance that the automobile sales competition is becoming more and more vigorous, automobile manufacturers are required to be innovated continuously, products are required to be marked newly and differently, personalized requirements are embodied on automobile equipment configuration, and more bright spots and selling spots are provided for sales. In appearance, a bicolor car body is a common design element of an automobile, and some car designs also select a certain position of the car body as a boundary line to design the bicolor car body. Because the automobile body has two colors and needs mass production, the spraying process of the automobile body needs to be reasonably designed on the basis of the normal spraying process of the automobile body, and the performance and the appearance quality of a double-color automobile body paint film are ensured. However, the existing two-color spray coating process has the following quality defects: (1) Step differences exist at the positions of the color dividing lines, and the height differences are formed by the thickness differences of paint films due to different coating passes between the two colors; (2) The color boundary is influenced by the fracture extensibility, thickness and tensile strength parameters of the used boundary adhesive tape, so that the color boundary has defects of tooth breakage, burr and uneven edges when the masking is removed, and the appearance perception at the boundary is poor; (3) Edge boundaries at two ends of products with different batch numbers cannot be consistent with the boundary of the whole vehicle, and deviation occurs; (4) The upper layer color of the double-color coating product is interfered by the bottom layer color to generate chromatic aberration; (5) three passes of coating resulted in low product yield.
Disclosure of Invention
The invention aims to provide a double-color coating process applied to an exterior coating line, which can produce double-color personalized coating products, meet the personalized requirements of a whole vehicle factory on the exterior products and further improve the terminal competitiveness of the whole vehicle products. The double-color coating process can realize matching and combining of different colors according to the color combination requirement of customers, and produce the personalized exterior trim with high color contrast. By using the double-color coating process disclosed by the invention, the quality defect of the existing double-color coating can be effectively overcome, the one-time off-line qualification rate is improved, the requirements of customers on the performance, appearance and color difference quality of a double-color coated part paint film are met, and an effective technical solution is provided for the step-by-step growth of individual vehicle body requirements of the customers in the future.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a two-color coating process applied to an exterior coating line, the process comprising the steps of:
step S1, spraying for the first time: the method comprises the following specific operation steps of primer spraying, colored paint A spraying, varnish static electricity and air gun spraying, varnish drying and cooling, coating the lower part, detecting after coating, and shielding the product meeting the requirements, wherein a demarcation shielding adhesive tape and shielding paper are adopted during shielding treatment:
(1) Embedding the product in a shielding auxiliary shape die to ensure that the sample is flatly and tightly embedded in the die; the shielding auxiliary shape die is a profiling die profiling the product piece;
(2) Taking a demarcation shielding adhesive tape A, carefully checking whether the edge of the adhesive tape has burrs and colloidal particles, selecting one side without burrs and colloidal particles for pasting, aligning the two ends of the adhesive tape with scale marks on two sides of a shielding auxiliary mold, lightly pasting the adhesive tape downwards on a demarcation line of a sample, forcefully expanding and removing small bubbles on the adhesive tape from the middle of the adhesive tape to two sides, and ensuring that the adhesive tape is flatly and tightly pasted on the sample;
(3) Lifting the profiling mold, pushing the sample piece from the lower part by fingers, bending when the boundary shielding adhesive tape A sticks to the edge positions of the two sides of the sample piece, and sticking the bent adhesive tape perpendicular to the edge of the sample piece, wherein the adhesive tape does not need to be tilted to form wrinkles when being bent, so that paint mist is prevented from flying in;
(4) The shielding paper is stuck on the surface of the demarcation shielding adhesive tape A to comprehensively shield the position of the surface of the sample piece A to be shielded, and the common adhesive tape is used for sticking and fixing the shielding paper turned to the surface B, so that an opening is not allowed, and water mist is prevented from entering the shielding area to form a watermark;
(5) After the demarcation shielding adhesive tape A is bent and stuck to the surface B from the surface A of the sample piece, 2 end points are formed at the edge positions of the two sides of the surface B of the sample piece, the other demarcation shielding adhesive tape B is used for sticking the two sides to the two end points, small bubbles on the adhesive tape are forcibly spread out from the middle of the adhesive tape to the two sides, and the adhesive tape is ensured to be flatly and tightly stuck to the sample piece;
(6) Using a common adhesive tape to be stuck on the surface of the demarcation shielding adhesive tape B to shield the position of the surface of the sample piece B to be shielded;
(7) The shielded sample is sequentially and lightly placed on a transfer logistics appliance vehicle;
wherein, the parameter of the demarcation masking tape is: adhesive tape thickness: 110 microns; elongation at break: 200%; tensile strength: 25N/CM; temperature resistance: 150 ℃; the rubber particles are not dropped when the piece is baked at 90 ℃/30 minutes to remove the adhesive tape; the pretreatment-resistant acidic flushing does not fall off;
the shielding paper consists of a PVC adhesive tape and a composite high-temperature film, wherein the PVC adhesive tape is stuck on the demarcation shielding adhesive tape, and the parameters are as follows: adhesive tape thickness: 115 microns; peel force: 2.5N/CM; temperature resistance: 150 ℃/2h; elongation percentage: 200%;
the parameters of the composite high temperature film are as follows: film thickness: 50-60 microns; temperature resistance: 110 ℃/2h; the pretreatment-resistant acidic flushing does not fall off;
step S2, spraying for the second time: spraying a colored paint A, spraying a varnish air gun, drying and cooling varnish, coating a lower piece, detecting after coating, checking and removing shielding on a product meeting the requirements at a point repairing station, performing wet polishing treatment on the product meeting the requirements after removing the shielding, reducing steps, preventing a second colored paint layer from being damaged during polishing, and polishing the second colored paint layer only; after polishing, preparing a product meeting the requirements for third spraying;
step S3, third spraying: and (3) spraying varnish by using an electrostatic and air gun, drying and cooling the varnish, and warehousing the product meeting the requirements.
As the preference of the invention, the specific operation steps of the first spraying in the step S1 are as follows:
step S1.1, detecting a coated workpiece material product in a workpiece loading area, and ensuring that the product has no collision scratch, no burr at the edge and no material forming defect;
s1.2, carrying out pretreatment, drying and cooling operations on a coated workpiece product in a pretreatment area in a coating line;
step S1.3, paint mixing is carried out in a paint mixing room in a coating line;
step S1.4, performing primer spraying in a primer spraying area in a coating line, carrying out electrostatic dust removal before spraying, and then performing primer spraying and primer leveling;
step S1.5, spraying the colored paint A in a colored paint spraying area in a coating line, carrying out electrostatic dust removal before spraying, and then spraying and leveling the colored paint A;
step S1.6, performing varnish spraying and varnish leveling in a varnish spraying area in a coating line, wherein during varnish spraying, a varnish electrostatic gun is used for spraying, and then a varnish air gun is used for spraying;
step S1.7, baking varnish in an oven area in a coating line at a temperature of 90+/-5 ℃ for 30 minutes, and cooling the varnish at a temperature of 23+/-2 ℃;
s1.8, conveying the coated product to a blanking area by utilizing a conveying chain, coating a blanking part, then detecting after coating, carrying out spot repair inspection if the requirements are met, and isolating if the requirements are not met;
s1.9, performing spot repair inspection on a spot repair area, inspecting the appearance of a coated product by adopting a visual inspection method, and polishing if appearance quality defects exist; if no appearance quality defect exists, carrying out shielding treatment;
step S1.10, polishing and grinding: polishing by using a polishing machine and a grinding machine, and isolating if appearance quality defects still exist after polishing; if no appearance quality defect exists, masking treatment is performed.
As the preference of the invention, the specific operation steps of the second spraying in the step S2 are as follows:
s2.1, detecting a coated workpiece product in a workpiece loading area to ensure that the product is free from collision and scratch;
s2.2, carrying out pretreatment, drying and cooling operations on the coated workpiece product in a pretreatment area in a coating line, wherein the drying temperature is 90+/-5 ℃ and the cooling temperature is 23+/-2 ℃;
s2.3, spraying the colored paint B in a colored paint spraying area in a coating line, carrying out electrostatic dust removal before spraying, and then spraying and leveling the colored paint B;
s2.4, performing varnish air gun spraying and varnish leveling in a varnish spraying area in a coating line, wherein a varnish electrostatic gun is not sprayed when varnish is sprayed, only the varnish air gun is sprayed, and the thickness of the varnish is controlled within a range of 5-8 microns;
step S2.5, baking varnish in an oven area in a coating line at a temperature of 90+/-5 ℃ for 30 minutes, and cooling the varnish at a temperature of 23+/-2 ℃;
s2.6, conveying the coated product to a blanking area by utilizing a conveying chain, coating a blanking part, then carrying out post-coating detection, carrying out spot repair inspection and removing shielding if the requirements are met, and isolating if the requirements are not met;
s2.7, performing spot repair inspection on the spot repair area, and checking whether the boundary line is straight and free of gaps and paint mist after shielding is removed by adopting a visual inspection method; if appearance quality defects exist, isolating; if no appearance quality defect exists, polishing;
step S2.8, polishing and grinding: wet 1200# abrasive paper is used for carrying out wet polishing treatment on the boundary steps of the A/B surface, the step difference is reduced, the second-pass color paint layer cannot be damaged during polishing, and only the second-pass clear paint layer is polished; after polishing, if appearance quality defects exist, isolating; if no appearance quality defect exists, preparing to spray for the third time.
As the preference of the invention, the specific operation steps of the third spraying in the step S3 are as follows:
s3.1, detecting a coated workpiece product in a workpiece loading area to ensure that the product is free from collision and scratch;
step S3.2, carrying out pretreatment, drying and cooling operations on the coated workpiece product in a pretreatment area in a coating line, wherein the drying temperature is 90+/-5 ℃ and the cooling temperature is 23+/-2 ℃;
step S3.3, performing varnish spraying and varnish leveling in a varnish spraying area in a coating line, wherein during varnish spraying, firstly, a varnish electrostatic gun is used for spraying, and then a varnish air gun is used for spraying;
step S3.4, baking varnish in an oven area in a coating line at a temperature of 90+/-5 ℃ for 30 minutes, and cooling the varnish at a temperature of 23+/-2 ℃;
s3.5, conveying the coated product to a blanking area by utilizing a conveying chain, coating a blanking part, then detecting after coating, if the coated product meets the requirements, performing spot repair inspection, and if the coated product does not meet the requirements, isolating;
s3.6, performing spot repair inspection on the spot repair area, checking the appearance quality of the coated product by adopting a visual inspection method, checking that the boundary line is flat and the boundary line of the AB surface is continuous and has no break point, and polishing if no defect exists; if the defect exists, the spot repair gun and the baking lamp for the spot repair area spray booth are used for carrying out spot repair spraying on the position with less paint on the opposite surface after shielding, if the appearance quality defect still exists after spot repair, the isolation is carried out, and if the defect does not exist, the storage is carried out;
step S3.7, polishing and grinding the A/B surface: polishing by using a polishing machine and a grinding machine, if defects exist after polishing, performing point repair spraying on the shielded positions with less paint on the opposite surfaces by using a point repair gun and a baking lamp in a point repair area, if appearance quality defects still exist after point repair, isolating, and if defects do not exist, warehousing; and (5) after polishing, if no defect exists, warehousing.
As a preferable aspect of the present invention, if the product is an oil tank cap, application number 2020226438386 is adopted, and the invention is named: a double-color spraying auxiliary shielding device for an oil tank cover is used as a shielding auxiliary mold.
As a further preferred aspect of the present invention, the coated product is pretreated in a pretreatment tank, dried in a drying oven, and cooled in a cooling zone by an air conditioner.
As a further preferred aspect of the present invention, the electrostatic precipitator is an electrostatic precipitator, and the primer, the paint, and the varnish are sprayed by a spraying robot, and the primer leveling, the paint leveling, and the varnish leveling are performed in a leveling chamber.
As a further preferred aspect of the present invention, the temperature of the primer coating area in the coating line is 23+ -2deg.C and the humidity is 65+ -5%; the temperature of a color paint spraying area in a coating line is 23+/-2 ℃ and the humidity is 65+/-5%; the temperature of the varnish spraying area in the coating line is 23+/-2 ℃, the humidity is 65+/-5%, the varnish spraying area is provided with a varnish electrostatic gun and a varnish air gun, the varnish electrostatic gun performs electrostatic spraying, and the varnish air gun performs normal air spraying.
As a further preferable mode of the invention, the post-coating detection comprises appearance quality detection, hundred check detection and color difference detection, and the detection is carried out by means of visual sense, hundred check knife, color difference meter, orange peel meter and the like; the appearance quality inspection content includes: the surface is smooth and has no touch scratch, sagging and open bottom, and no obvious particle shrinkage cavity.
As a further preferred aspect of the present invention, in step S1 to step S3, when the oil tank cover is sprayed, the product is fixed on a coating jig, and the front and the back of the product are sprayed simultaneously, wherein the coating jig adopts the application number: 202022851209.2 and when using ordinary sticky tape to paste fixed shielding paper to oil tank flap B face, the sticky tape can not paste in the socket border position of pegging graft with the application tool, prevents to hinder the application tool to peg graft and go on, guarantees that double-colored product positive and negative all sprays in the coating line, accomplishes double-colored two-sided spraying, can also reduce film surface granule and fibre quantity moreover, improves the product off-line qualification rate.
The invention has the advantages and beneficial effects that:
(1) The coating process provided by the invention uses the demarcation adhesive tape, the PVC adhesive tape and the composite high-temperature film which are specially developed for double-color spraying, can overcome the defects of broken teeth, rough edges and uneven edges of the demarcation line during shielding, ensures that the color demarcation line has no broken teeth rough edges, improves the appearance perception of the demarcation line, and simultaneously can ensure that the surface of the dried sample piece has no water mark, is convenient for polishing and polishing treatment, and has flat and straight color demarcation line without deformation.
(2) The double-color coating process provided by the invention can eliminate the step difference of the color dividing line, cancel primer coating in the second-time coating process, only coat an air gun on the varnish after the color paint is coated, and effectively reduce the thickness of the second-time coating paint film; in addition, after drying, the shielded color boundary line is slightly polished and removed by using wet 1200# abrasive paper, and then third varnish spraying is carried out, so that the step difference can be effectively eliminated.
(3) The invention shields the demarcation adhesive tape of the small external ornament by the designed profiling tool, and can effectively ensure that the shielding precision of products produced in batch is controlled within the tolerance range of +/-0.25 mm. In addition, the primary and secondary detection tools can be designed to detect the precision state of the parting line of the small exterior trim product after the shielding is removed, and the primary detection tools are used to detect the precision state of the parting line of the lap joint part of the vehicle body, so that the positions of the parting lines of the two products are controlled within the precision requirement range, and the consistency of the parting line of the products when the products are assembled together is ensured.
(4) According to the invention, through only spraying the varnish by the air station in the second coating process, the thickness of the varnish is controlled within the range of 5-8 microns, so that the varnish can be ensured to cover the pigment with the color paint effect, and the visual color difference of the product can be ensured to be qualified after the third varnish spraying, and the step difference reduction requirement can be ensured.
(5) According to the oil tank cover coating jig, which is designed by the applicant, the small-piece coating product is ensured to be capable of completing double-sided and double-sided spraying in a coating line, so that the defect number of particles, different colors, fibers and the like is effectively reduced, and the one-time offline qualification rate is further improved.
(6) The exterior double-color coating process can effectively solve a series of quality problems that boundary line step difference, broken teeth and burrs appear on the boundary line and boundary line position fluctuation cause incapability of being consistent with a vehicle body boundary line, the qualification rate of a multi-pass coated product is low and the like in the traditional exterior double-color coating, and provides an exterior double-color product with stable quality, paint film performance, appearance and qualified chromatic aberration for a vehicle body factory customer, and meets the requirement of the customer on individuation.
(7) The double-color coating process can produce double-color exterior products meeting the quality requirements of customers of a vehicle body main machine factory, improve the terminal competitiveness of the vehicle body products, and finally ensure that the one-time off-line qualification rate reaches more than 70 percent through a series of effective process link optimization, thereby effectively ensuring mass production and supply, reducing the production and manufacturing cost and improving the economic benefit.
(8) According to the invention, the color parting line adhesive tape, the PVC adhesive tape and the composite high-temperature film shielding material are developed according to the production environment of a coating line, the adhesive tape and the shielding material can resist acid pretreatment of the coating line, resist shower and high-temperature baking (90 ℃/30 minutes) without colloidal particles, and have few water marks generated by baking in a baking room after pretreatment water washing and are easy to polish and polish; the demarcation adhesive tape ensures that the color demarcation line after shielding is removed does not have broken teeth and burrs, and improves the one-time offline qualification rate of products.
Drawings
FIG. 1 is a flow chart of a first spray process of the present invention for a two-color coating process on a fuel tank cap product;
FIG. 2 is a flow chart of a first spray process of the present invention for a two-color coating process on a fuel tank cap product;
FIG. 3 is a flow chart of a first spray process of the present invention for a two-color coating process on a fuel tank cap product;
FIG. 4 is a schematic view of the fuel tank cap inlaid in the shielding auxiliary mold when shielding according to the present invention;
FIG. 5 is a schematic view of a masking tape A for masking according to the present invention;
FIG. 6 is a second schematic view of the masking tape A for masking according to the present invention;
FIG. 7 is a third schematic view of a demarcation masking tape A for masking according to the present invention;
FIG. 8 is a schematic illustration of a masking paper applied during masking in accordance with the present invention;
FIG. 9 is a schematic view of a demarcation masking tape B applied during masking in accordance with the present invention;
FIG. 10 is a schematic view of the shielded fuel tank cap B of the present invention;
FIG. 11 is a schematic view of the shielded fuel tank cap A of the present invention;
FIG. 12 is a schematic illustration I of a two-color fuel tank cap obtained by the coating process of the present invention;
FIG. 13 is a schematic diagram II of a two-color fuel tank cap obtained by the coating process of the present invention;
FIG. 14 is a schematic view of a dual color fuel tank cap obtained by the coating process of the present invention after assembly with the entire vehicle;
Detailed Description
The following detailed description is provided to enable those skilled in the art to better understand the technical solution of the present invention and its advantages, but is not intended to limit the scope of the present invention.
The invention provides a double-color coating process applied to an exterior coating line, which is described in detail below by taking a spray oil tank cover as an example, and comprises the following steps:
step S1, spraying for the first time: spraying primer, spraying colored paint A, spraying varnish by using a static electricity and air gun, drying and cooling the varnish, coating a lower piece, detecting after coating, and shielding a product meeting the requirements;
as shown in fig. 1, the specific operation steps of step S1 are as follows:
step S1.1, detecting a coated workpiece product in a workpiece loading area, and ensuring that the product has no collision scratch, no burr at the edge and no material forming defect;
s1.2, carrying out pretreatment, drying and cooling operations on a coated workpiece product in a pretreatment area in a coating line;
step S1.3, paint mixing is carried out in a paint mixing room in a coating line;
step S1.4, performing primer spraying in a primer spraying area in a coating line, carrying out electrostatic dust removal before spraying, and then performing primer spraying and primer leveling;
step S1.5, spraying the colored paint A in a colored paint spraying area in a coating line, carrying out electrostatic dust removal before spraying, and then spraying and leveling the colored paint A;
step S1.6, performing varnish spraying and varnish leveling in a varnish spraying area in a coating line, wherein during varnish spraying, a varnish electrostatic gun is used for spraying, and then a varnish air gun is used for spraying;
step S1.7, baking varnish in an oven area in a coating line at a temperature of 90+/-5 ℃ for 30 minutes, and cooling the varnish at a temperature of 23+/-2 ℃;
s1.8, conveying the coated product to a blanking area by utilizing a conveying chain, coating a blanking part, then detecting after coating, carrying out spot repair inspection if the requirements are met, and isolating if the requirements are not met;
s1.9, performing spot repair inspection on a spot repair area, inspecting the appearance of a coated product by adopting a visual inspection method, and polishing if appearance quality defects exist; if no appearance quality defect exists, carrying out shielding treatment;
step S1.10, polishing and grinding: polishing by using a polishing machine and a grinding machine, and isolating if appearance quality defects still exist after polishing; if no appearance quality defect exists, carrying out shielding treatment; the shielding treatment adopts demarcation shielding adhesive tape and shielding paper, and the specific operation steps are as follows:
(1) Embedding the product in a shielding auxiliary shape mould to ensure that the sample is flatly and tightly embedded in the mould (see figure 4); the shielding auxiliary shape die is a profiling die profiling a product piece, and adopts the application number of 2020226438386 and the invention name of 2020226438386: the double-color spraying auxiliary shielding device of the oil tank port cover is used as a shielding auxiliary shape die, so that the shielding precision of mass-produced products can be effectively controlled within a tolerance range of +/-0.25 mm, the color parting line is ensured to be flat and meet the precision requirement, and accurate positioning and pasting are performed according to the parting line position required by customers;
(2) Taking a demarcation shielding adhesive tape A, carefully checking whether the edge of the adhesive tape has burrs and colloidal particles, selecting one side without burrs and colloidal particles for pasting, aligning the two ends of the adhesive tape with scale marks on two sides of a shielding auxiliary mold, lightly pasting the adhesive tape downwards on a demarcation line of a sample piece, forcefully spreading small bubbles on the adhesive tape from the middle of the adhesive tape to two sides, and ensuring that the adhesive tape is flatly and tightly pasted on the sample piece (see figure 5;
(3) Lifting the profiling mold, pushing the sample from the lower part by fingers, bending when dividing and shielding the positions of the edges of the two sides of the adhesive tape A, and adhering the bent adhesive tape perpendicular to the edges of the sample, wherein the adhesive tape is not required to be tilted to form wrinkles when being bent, so that paint mist is prevented from flying in (see fig. 6 and 7);
(4) The masking paper is stuck on the surface of the demarcation masking tape A to comprehensively mask the part of the surface of the sample piece A to be masked, and the masking paper turned over to the surface B is stuck and fixed on the surface B by using a common tape without allowing an opening to prevent water mist from entering the masking area to form a watermark (see figure 8);
(5) After the demarcation shielding adhesive tape A is bent and stuck to the surface B from the surface A of the sample piece, 2 end points are formed at the edge positions of the two sides of the surface B of the sample piece, the other demarcation shielding adhesive tape B is used for sticking the two sides to the two end points, small bubbles on the adhesive tape are forcibly spread out from the middle of the adhesive tape to the two sides, and the adhesive tape is ensured to be stuck on the sample piece flatly and tightly (see figure 9);
(6) Using a common adhesive tape to be stuck on the surface of the demarcation shielding adhesive tape B to shield the surface of the sample piece B to be shielded; when the common adhesive tape is used for pasting and fixing shielding paper on the B surface of the oil tank cover, the adhesive tape cannot be pasted at the edge of a socket which is spliced with the coating jig, so that the coating jig is prevented from being spliced (see figure 10);
(7) The shielded sample pieces are sequentially and lightly placed on a transfer logistics tool vehicle (see FIG. 11);
wherein, the parameter of the demarcation masking tape is: adhesive tape thickness: 110 microns; elongation at break: 200%; tensile strength: 25N/CM; temperature resistance: 150 ℃; the rubber particles are not dropped when the piece is baked at 90 ℃/30 minutes to remove the adhesive tape; the pretreatment-resistant acidic flushing does not fall off;
the shielding paper consists of a PVC adhesive tape and a composite high-temperature film, wherein the PVC adhesive tape is stuck on the demarcation shielding adhesive tape, and the parameters are as follows: adhesive tape thickness: 115 microns; and (3) glue system: natural rubber; peel force: 2.5N/CM; temperature resistance: 150 ℃/2h; elongation percentage: 200%; color: orange;
the parameters of the composite high temperature film are as follows: film thickness: 50-60 microns; temperature resistance: 110 ℃/2h; the pretreatment-resistant acidic flushing does not fall off;
step S2, spraying for the second time: spraying a colored paint A, spraying a varnish air gun, drying and cooling varnish, coating a lower piece, detecting after coating, performing spot repair inspection on a product meeting the requirements, removing shielding, performing wet polishing treatment on the product meeting the requirements after removing shielding, reducing steps, enabling a second colored paint layer not to be damaged during polishing, and polishing the second colored paint layer only; after polishing, preparing a product meeting the requirements for third spraying;
as shown in fig. 2, the specific operation steps of the second spraying in step S2 are as follows:
s2.1, detecting a coated workpiece product in a workpiece loading area to ensure that the product is free from collision and scratch;
s2.2, carrying out pretreatment, drying and cooling operations on the coated workpiece product in a pretreatment area in a coating line, wherein the drying temperature is 90+/-5 ℃ and the cooling temperature is 23+/-2 ℃;
s2.3, spraying the colored paint B in a colored paint spraying area in a coating line, carrying out electrostatic dust removal before spraying, and then spraying and leveling the colored paint B;
s2.4, carrying out varnish spraying and varnish leveling in a varnish spraying area in a coating line, wherein a varnish electrostatic gun is not sprayed when the varnish is sprayed, only a varnish air gun is sprayed, and the thickness of the varnish is controlled within a range of 5-8 microns;
step S2.5, baking varnish in an oven area in a coating line at a temperature of 90+/-5 ℃ for 30 minutes, and cooling the varnish at a temperature of 23+/-2 ℃;
s2.6, conveying the coated product to a blanking area by utilizing a conveying chain, coating a blanking part, then carrying out post-coating detection, carrying out spot repair inspection and removing shielding if the requirements are met, and isolating if the requirements are not met;
s2.7, performing spot repair inspection on the spot repair area, and checking whether the boundary line is straight and free of gaps and paint mist after shielding is removed by adopting a visual inspection method; if appearance quality defects exist, isolating; if no appearance quality defect exists, polishing;
step S2.8, polishing and grinding: wet 1200# abrasive paper is used for carrying out wet polishing treatment on the boundary steps of the A/B surface, the steps are reduced, the second-time color paint layer cannot be damaged during polishing, and only the second-time varnish layer is polished; after polishing, if appearance quality defects exist, isolating; if no appearance quality defect exists, preparing to spray for the third time.
Step S3, third spraying: and (3) spraying varnish by using an electrostatic and air gun, drying and cooling the varnish, and warehousing the product meeting the requirements.
As shown in fig. 3, the specific operation steps of the third spraying in step S3 are as follows:
s3.1, detecting a coated workpiece product in a workpiece loading area to ensure that the product is free from collision and scratch;
step S3.2, carrying out pretreatment, drying and cooling operations on the coated workpiece product in a pretreatment area in a coating line, wherein the drying temperature is 90+/-5 ℃ and the cooling temperature is 23+/-2 ℃;
step S3.3, performing varnish spraying and varnish leveling in a varnish spraying area in a coating line, wherein during the varnish spraying, a varnish electrostatic gun is used for spraying, and then a varnish air gun is used for spraying;
step S3.4, baking varnish in an oven area in a coating line at a temperature of 90+/-5 ℃ for 30 minutes, and cooling the varnish at a temperature of 23+/-2 ℃;
s3.5, conveying the coated product to a blanking area by utilizing a conveying chain, coating a blanking part, then detecting after coating, if the coated product meets the requirements, performing spot repair inspection, and if the coated product does not meet the requirements, isolating;
s3.6, performing spot repair inspection on the spot repair area, checking the appearance quality of the coated product by adopting a visual inspection method, checking that the boundary line is flat and the boundary line of the AB surface is continuous and has no break point, and polishing if no defect exists; if the defect exists, the spot repair gun and the baking lamp for the spot repair area spray booth are used for carrying out spot repair spraying on the position with less paint on the opposite surface after shielding, if the appearance quality defect still exists after spot repair, the isolation is carried out, and if the defect does not exist, the storage is carried out;
step S3.7, polishing and grinding the A/B surface: polishing by using a polishing machine and a grinding machine, if defects exist after polishing, performing point repair spraying on the shielded positions with less paint on the opposite surfaces by using a point repair gun and a baking lamp in a point repair area, if appearance quality defects still exist after point repair, isolating, and if defects do not exist, warehousing; and (5) after polishing, if no defect exists, warehousing.
In this embodiment, the coated product is pretreated in the pretreatment tank, dried in the drying oven, and cooled in the cooling zone by air conditioning.
In the embodiment, the electrostatic dust collection device is used for electrostatic dust collection during electrostatic dust collection, the spraying robot is used for spraying the primer, the colored paint and the varnish, and the leveling of the primer, the leveling of the colored paint and the average leveling of the varnish are carried out in the leveling chamber.
In the embodiment, the temperature of the primer spraying area in the coating line is 23+/-2 ℃ and the humidity is 65+/-5%; the temperature of a color paint spraying area in a coating line is 23+/-2 ℃ and the humidity is 65+/-5%; the temperature of a varnish spraying area in a coating line is 23+/-2 ℃, the humidity is 65+/-5%, the varnish spraying area is provided with a varnish electrostatic gun and a varnish gas spray gun, the varnish electrostatic gun performs electrostatic spraying, and the varnish gas spray gun performs normal air spraying;
in the embodiment, the post-coating detection comprises appearance quality detection, hundred-check detection and color difference detection, and the detection is carried out by adopting means such as visual, hundred-check knife, color difference meter, orange peel meter and the like; the appearance quality inspection content includes: the surface is smooth and has no touch scratch, sagging and open bottom, and no obvious particle shrinkage cavity.
Further, in this embodiment, when spraying the oil tank cover, step S1 to step S3 fix the product on the application jig, the simultaneous spraying of the front and back, the application number is adopted to the application jig: 202022851209.2 the oil tank cover coating jig, because when using ordinary sticky tape to paste fixed shielding paper to oil tank cover B face, do not paste the sticky tape with the socket border position of application tool grafting, so oil tank cover can peg graft on the application tool, guarantees that two-color product positive and negative all spray in the coating line, accomplishes two-color double-sided spraying, can also reduce film surface granule and fibre quantity moreover, improves the product off-line qualification rate.
The oil tank cover produced by the double-color coating process is shown in fig. 12 and 13, and the schematic diagram of the oil tank cover assembled with the whole automobile is shown in fig. 14, and the process is optimized through a series of process links with great effect, so that the one-time off-line qualification rate is up to more than 70%, the mass production and supply are effectively ensured, the production and manufacturing cost is reduced, and the economic benefit is improved.
In addition, in order to avoid the situation that boundary lines at two ends of products with different batch numbers cannot coincide with the boundary line of the whole vehicle and deviation occurs, a double-color product color boundary line primary-secondary detection tool can be designed, the tolerance of the detection tool is within +/-0.25, the secondary detection tool is used for detecting the boundary line precision state of small exterior products (oil tank port covers) after the shielding is removed through the second spraying, the primary detection tool is used for detecting the boundary line precision state of the lap joint part of the vehicle body, and the boundary line positions of the products of the two sides are controlled within the precision requirement range, so that the product assembly is guaranteed to coincide and be consistent in time.
The shielding materials specially developed above are used in the shielding process, so that the color dividing line can be effectively ensured to have no broken teeth and burrs, the surface of the dried sample piece has no water mark, the surface of the dried sample piece is convenient to polish and polish, the color dividing line is flat and has no deformation, and the shielding materials can be ordered directly from the macro technology limited company of baoding city.
Claims (10)
1. A two-color coating process applied to an exterior coating line, characterized in that the process comprises the steps of:
step S1, spraying for the first time: the method comprises the following specific operation steps of primer spraying, colored paint A spraying, varnish static electricity and air gun spraying, varnish drying and cooling, coating the lower part, detecting after coating, and shielding the product meeting the requirements, wherein a demarcation shielding adhesive tape and shielding paper are adopted during shielding treatment:
(1) Embedding the product in a shielding auxiliary shape die to ensure that the sample is flatly and tightly embedded in the die; the shielding auxiliary shape die is a profiling die profiling the product piece;
(2) Taking a demarcation shielding adhesive tape A, carefully checking whether the edge of the adhesive tape has burrs and colloidal particles, selecting one side without burrs and colloidal particles for pasting, aligning the two ends of the adhesive tape with scale marks on two sides of a shielding auxiliary mold, lightly pasting the adhesive tape downwards on a demarcation line of a sample, forcefully expanding and removing small bubbles on the adhesive tape from the middle of the adhesive tape to two sides, and ensuring that the adhesive tape is flatly and tightly pasted on the sample;
(3) Lifting the profiling mold, pushing the sample piece from the lower part by fingers, bending when the boundary shielding adhesive tape A sticks to the edge positions of the two sides of the sample piece, and sticking the bent adhesive tape perpendicular to the edge of the sample piece, wherein the adhesive tape does not need to be tilted to form wrinkles when being bent, so that paint mist is prevented from flying in;
(4) The shielding paper is stuck on the surface of the demarcation shielding adhesive tape A to comprehensively shield the position of the surface of the sample piece A to be shielded, and the common adhesive tape is used for sticking and fixing the shielding paper turned to the surface B, so that an opening is not allowed, and water mist is prevented from entering the shielding area to form a watermark;
(5) After the demarcation shielding adhesive tape A is bent and stuck to the surface B from the surface A of the sample piece, 2 end points are formed at the edge positions of the two sides of the surface B of the sample piece, the other demarcation shielding adhesive tape B is used for sticking the two sides to the two end points, small bubbles on the adhesive tape are forcibly spread out from the middle of the adhesive tape to the two sides, and the adhesive tape is ensured to be flatly and tightly stuck to the sample piece;
(6) Using a common adhesive tape to be stuck on the surface of the demarcation shielding adhesive tape B to shield the position of the surface of the sample piece B to be shielded;
(7) The shielded sample is sequentially and lightly placed on a transfer logistics appliance vehicle;
wherein, the parameter of the demarcation masking tape is: adhesive tape thickness: 110 microns; elongation at break: 200%; tensile strength: 25N/CM; temperature resistance: 150 ℃; the rubber particles are not dropped when the piece is baked at 90 ℃/30 minutes to remove the adhesive tape; the pretreatment-resistant acidic flushing does not fall off;
the shielding paper consists of a PVC adhesive tape and a composite high-temperature film, wherein the PVC adhesive tape is stuck on the demarcation shielding adhesive tape, and the parameters are as follows: adhesive tape thickness: 115 microns; peel force: 2.5N/CM; temperature resistance: 150 ℃/2h; elongation percentage: 200%;
the parameters of the composite high temperature film are as follows: film thickness: 50-60 microns; temperature resistance: 110 ℃/2h; the pretreatment-resistant acidic flushing does not fall off;
step S2, spraying for the second time: spraying a colored paint A, spraying a varnish air gun, drying and cooling varnish, coating a lower piece, detecting after coating, checking and removing shielding on a product meeting the requirements at a point repairing station, performing wet polishing treatment on the product meeting the requirements after removing the shielding, reducing steps, preventing a second colored paint layer from being damaged during polishing, and polishing the second colored paint layer only; after polishing, preparing a product meeting the requirements for third spraying;
step S3, third spraying: and (3) spraying varnish by using an electrostatic and air gun, drying and cooling the varnish, and warehousing the product meeting the requirements.
2. The double-color coating process applied to an exterior coating line according to claim 1, wherein the specific operation steps of the first spray coating in step S1 are as follows:
step S1.1, detecting a coated workpiece material product in a workpiece loading area, and ensuring that the product has no collision scratch, no burr at the edge and no material forming defect;
s1.2, carrying out pretreatment, drying and cooling operations on a coated workpiece product in a pretreatment area in a coating line;
step S1.3, paint mixing is carried out in a paint mixing room in a coating line;
step S1.4, performing primer spraying in a primer spraying area in a coating line, carrying out electrostatic dust removal before spraying, and then performing primer spraying and primer leveling;
step S1.5, spraying the colored paint A in a colored paint spraying area in a coating line, carrying out electrostatic dust removal before spraying, and then spraying and leveling the colored paint A;
step S1.6, performing varnish spraying and varnish leveling in a varnish spraying area in a coating line, wherein during varnish spraying, a varnish electrostatic gun is used for spraying, and then a varnish air gun is used for spraying;
step S1.7, baking varnish in an oven area in a coating line at a temperature of 90+/-5 ℃ for 30 minutes, and cooling the varnish at a temperature of 23+/-2 ℃;
s1.8, conveying the coated product to a blanking area by utilizing a conveying chain, coating a blanking part, then detecting after coating, carrying out spot repair inspection if the requirements are met, and isolating if the requirements are not met;
s1.9, performing spot repair inspection on a spot repair area, inspecting the appearance of a coated product by adopting a visual inspection method, and polishing if appearance quality defects exist; if no appearance quality defect exists, carrying out shielding treatment;
step S1.10, polishing and grinding: polishing by using a polishing machine and a grinding machine, and isolating if appearance quality defects still exist after polishing; if no appearance quality defect exists, masking treatment is performed.
3. The double-color coating process applied to an exterior coating line according to claim 1, wherein the specific operation steps of the second spray in step S2 are as follows:
s2.1, detecting a coated workpiece product in a workpiece loading area to ensure that the product is free from collision and scratch;
s2.2, carrying out pretreatment, drying and cooling operations on the coated workpiece product in a pretreatment area in a coating line, wherein the drying temperature is 90+/-5 ℃ and the cooling temperature is 23+/-2 ℃;
s2.3, spraying the colored paint B in a colored paint spraying area in a coating line, carrying out electrostatic dust removal before spraying, and then spraying and leveling the colored paint B;
s2.4, performing varnish air gun spraying and varnish leveling in a varnish spraying area in a coating line, wherein a varnish electrostatic gun is not sprayed when varnish is sprayed, only the varnish air gun is sprayed, and the thickness of the varnish is controlled within a range of 5-8 microns;
step S2.5, baking varnish in an oven area in a coating line at a temperature of 90+/-5 ℃ for 30 minutes, and cooling the varnish at a temperature of 23+/-2 ℃;
s2.6, conveying the coated product to a blanking area by utilizing a conveying chain, coating a blanking part, then carrying out post-coating detection, carrying out spot repair inspection and removing shielding if the requirements are met, and isolating if the requirements are not met;
s2.7, performing spot repair inspection on the spot repair area, and checking whether the boundary line is straight and free of gaps and paint mist after shielding is removed by adopting a visual inspection method; if appearance quality defects exist, isolating; if no appearance quality defect exists, polishing;
step S2.8, polishing and grinding: wet 1200# abrasive paper is used for carrying out wet polishing treatment on the boundary steps of the A/B surface, the step difference is reduced, the second-pass color paint layer cannot be damaged during polishing, and only the second-pass clear paint layer is polished; after polishing, if appearance quality defects exist, isolating; if no appearance quality defect exists, preparing to spray for the third time.
4. The double-color coating process applied to an exterior coating line according to claim 1, wherein the specific operation steps of the third spray coating in step S3 are as follows:
s3.1, detecting a coated workpiece product in a workpiece loading area to ensure that the product is free from collision and scratch;
step S3.2, carrying out pretreatment, drying and cooling operations on the coated workpiece product in a pretreatment area in a coating line, wherein the drying temperature is 90+/-5 ℃ and the cooling temperature is 23+/-2 ℃;
step S3.3, performing varnish spraying and varnish leveling in a varnish spraying area in a coating line, wherein during varnish spraying, firstly, a varnish electrostatic gun is used for spraying, and then a varnish air gun is used for spraying;
step S3.4, baking varnish in an oven area in a coating line at a temperature of 90+/-5 ℃ for 30 minutes, and cooling the varnish at a temperature of 23+/-2 ℃;
s3.5, conveying the coated product to a blanking area by utilizing a conveying chain, coating a blanking part, then detecting after coating, if the coated product meets the requirements, performing spot repair inspection, and if the coated product does not meet the requirements, isolating;
s3.6, performing spot repair inspection on the spot repair area, checking the appearance quality of the coated product by adopting a visual inspection method, checking that the boundary line is flat and the boundary line of the AB surface is continuous and has no break point, and polishing if no defect exists; if the defect exists, the spot repair gun and the baking lamp for the spot repair area spray booth are used for carrying out spot repair spraying on the position with less paint on the opposite surface after shielding, if the appearance quality defect still exists after spot repair, the isolation is carried out, and if the defect does not exist, the storage is carried out;
step S3.7, polishing and grinding the A/B surface: polishing by using a polishing machine and a grinding machine, if defects exist after polishing, performing point repair spraying on the shielded positions with less paint on the opposite surfaces by using a point repair gun and a baking lamp in a point repair area, if appearance quality defects still exist after point repair, isolating, and if defects do not exist, warehousing; and (5) after polishing, if no defect exists, warehousing.
5. The two-color coating process for an exterior coating line according to claim 1, wherein if the product is a tank cap, the application number is 2020226438386, and the invention is: a double-color spraying auxiliary shielding device for an oil tank cover is used as a shielding auxiliary mold.
6. The double-color coating process applied to an exterior coating line according to claim 1, wherein in the step S1 to the step S3, when the oil tank cover is sprayed, a product is fixed on a coating jig, and the front side and the back side are simultaneously sprayed, and the coating jig adopts the application number: 202022851209.2, and when using ordinary sticky tape to paste fixed shielding paper to oil tank flap B face, the sticky tape can not paste in the socket edge position of pegging graft with the application tool, prevents to hinder the application tool grafting to go on.
7. The two-color coating process for an exterior finishing coating line according to claim 1, wherein the coated upper product is pretreated in a pretreatment tank, dried in a drying oven, and cooled in a cooling zone by an air conditioner.
8. A double-color coating process applied to an exterior coating line according to claim 2, 3 or 4, wherein the electrostatic dust removal is performed by an electrostatic dust removal device during the electrostatic dust removal, and the primer, the paint and the varnish are sprayed by a spraying robot, and the primer leveling, the paint leveling and the varnish leveling are performed in a leveling chamber.
9. A two-color coating process applied to an exterior coating line according to claim 2, 3 or 4, wherein the temperature of the primer-sprayed area in the coating line is 23±2 ℃ and the humidity is 65±5%; the temperature of a color paint spraying area in a coating line is 23+/-2 ℃ and the humidity is 65+/-5%; the temperature of the varnish spraying area in the coating line is 23+/-2 ℃, the humidity is 65+/-5%, the varnish spraying area is provided with a varnish electrostatic gun and a varnish air gun, the varnish electrostatic gun performs electrostatic spraying, and the varnish air gun performs normal air spraying.
10. A double-color coating process applied to an exterior coating line according to claim 2, 3 or 4, wherein the post-coating detection comprises appearance quality detection, hundred check detection, color difference detection, and detection is performed by using a visual, hundred-check knife, and color difference meter; the appearance quality inspection content includes: the surface is smooth and has no touch scratch, sagging and open bottom, and no obvious particle shrinkage cavity.
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| CN112264279A (en) * | 2020-09-27 | 2021-01-26 | 中国第一汽车股份有限公司 | Flexible color register coating process for automobile body |
| CN112275594A (en) * | 2020-10-15 | 2021-01-29 | 中国第一汽车股份有限公司 | Flexible color register coating method for automobile body |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112264279A (en) * | 2020-09-27 | 2021-01-26 | 中国第一汽车股份有限公司 | Flexible color register coating process for automobile body |
| CN112275594A (en) * | 2020-10-15 | 2021-01-29 | 中国第一汽车股份有限公司 | Flexible color register coating method for automobile body |
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