CN114345653A - Hub coating method - Google Patents
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- CN114345653A CN114345653A CN202210046896.1A CN202210046896A CN114345653A CN 114345653 A CN114345653 A CN 114345653A CN 202210046896 A CN202210046896 A CN 202210046896A CN 114345653 A CN114345653 A CN 114345653A
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Images
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
- 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
-
- 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
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
- B05D1/06—Applying particulate materials
-
- 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
-
- 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
- B05D3/10—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 other chemical means
- B05D3/102—Pretreatment of metallic substrates
-
- 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
-
- 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
- B05D7/14—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 to metal, e.g. car bodies
-
- 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
- B05D7/52—Two layers
- B05D7/53—Base coat plus clear coat type
- B05D7/536—Base coat plus clear coat type each layer being cured, at least partially, separately
-
- 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
- B05D2502/00—Acrylic polymers
-
- 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
- B05D2504/00—Epoxy polymers
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention relates to a hub coating method. The hub coating method comprises the following steps: the method comprises the following steps of pretreatment, bottom powder spraying of the color epoxy polyester filler, finish turning and transparent powder spraying; the process for spraying the color epoxy polyester filler base powder comprises the following steps: in the powder spraying room, the epoxy polyester pure-color powder coating or the epoxy polyester colorful powder coating enables charged powder to be freely and uniformly adsorbed on the surface of the hub under the action of compressed air and static electricity by the principle of high-voltage electrostatic spraying; uniformly leveling and curing the epoxy polyester pure-color powder coating or the powdered epoxy polyester colorful powder coating by an oven to form a matrix coating, wherein the thickness of the matrix coating is 90-120 mu m; the curing time is as follows: 15-22 minutes, the curing temperature is: and carrying out 15-20Min cooling on the wheel hub by using 80000-. The hub coating method simplifies the hub coating procedure and reduces the hub coating cost; the influence caused by volatilization of organic matters in the paint is eliminated.
Description
Technical Field
The invention belongs to the technical field of hub production, and particularly relates to a hub coating method.
Background
At present, a hub formed by casting and machining needs to be polished and then coated with a coating line, an even coating is formed on the surface of an aluminum alloy hub, the attractiveness of the hub is improved, the corrosion resistance, the impact resistance and other performances of the hub are enhanced, and the requirements of different customers are met.
The conventional hub coating process comprises the following steps: preprocessing a hub matrix to be sprayed; performing base powder spraying on the hub substrate after pretreatment according to a preset film thickness, and performing curing treatment under a first curing condition; carrying out color paint spraying on the hub matrix after the base powder is sprayed, and carrying out curing treatment under a second curing condition; and spraying varnish or spraying processed transparent powder on the hub matrix sprayed with the colored paint, and curing under a third curing condition. However, the paint spraying has environmental problems, serious pollution and complex coating process.
Disclosure of Invention
In order to solve the technical problems, the invention provides a hub coating method, which simplifies the hub coating process and reduces the hub coating cost; the influence of volatilization of organic matters in the paint is eliminated, so that the hub coating is more environment-friendly.
The technical scheme of the hub coating method is as follows:
a hub coating method comprises the following steps: the method comprises the following steps of pretreatment, bottom powder spraying of the color epoxy polyester filler, finish turning and transparent powder spraying;
the process for spraying the color epoxy polyester filler base powder comprises the following steps: in the powder spraying room, the epoxy polyester pure-color powder coating or the epoxy polyester colorful powder coating enables charged powder to be freely and uniformly adsorbed on the surface of the hub under the action of compressed air and static electricity by the principle of high-voltage electrostatic spraying; uniformly leveling and curing the epoxy polyester pure-color powder coating or the epoxy polyester colorful powder coating by a powder oven to form a matrix coating, wherein the thickness of the matrix coating is 90-120 mu m; the solidification time is 15-22 minutes, the fixed temperature is 175-.
As a further improvement of the above technical solution, the pretreatment process includes the steps of: the aluminum alloy wheel hub is treated by the processes of hot water washing, pre-degreasing, water washing, main degreasing, acid washing, pure water washing, chromium-free passivation and pure water washing, and then is baked by an oven and cooled by a cold air chamber, so that the pretreatment is completed.
As a further improvement of the technical scheme, the finish turning process adopts a finish turning machine tool to machine the hub color registration part, and the turning depth is controlled to be between 0.2MM and 0.8MM, so that the aluminum matrix is turned, and the color registration finished product effect is highlighted.
As a further improvement to the above technical solution, the transparent powder spraying process comprises the steps of: in the powder spraying room, the acrylic powder coating enables charged powder to be freely and uniformly adsorbed on a solidified substrate coating on the surface of a hub under the action of compressed air and static electricity by a high-voltage electrostatic spraying principle; uniformly leveling and curing the acrylic acid powder coating through a powder oven to form an effect coating, wherein the thickness of the effect coating is 80-100 mu m; the solidification time is 17-25 minutes, the fixed temperature is 180-.
The invention provides a hub coating method, which has the following beneficial effects compared with the prior art:
compared with the hub coating method in the prior art, the hub coating method provided by the invention has the advantages that (1) the existing hub coating method has no color requirement, the base powder has the effect of improving the surface smoothness and the adhesion performance of the product, and the hub coating method provided by the invention puts forward the color requirement and higher appearance requirement on the base powder spraying on the original basis. (2) The existing hub coating method requires curing at 177 ℃ for 10-15Min, and the hub coating method prolongs the curing time to achieve complete curing of the coating. (3) The existing hub coating method is directly transferred to liquid paint line spraying, the hub coating method of the invention cancels the technological processes of colored paint spraying and colored paint curing, about 1/4 investment of line bodies can be reduced, about 5000 ten thousand yuan of line bodies can be reduced by taking 100 ten thousand aluminum alloy hub coating production lines as an example, 1250 ten thousand investment can be reduced, and VOC emission, solid waste emission and the like of acrylic acid liquid paint adopted in the traditional aluminum alloy hub coating process are eliminated, so that the hub coating is more environment-friendly. (4) The existing hub coating method has no performance detection requirement of a base powder curing film, and the hub coating method provided by the invention increases the whole set of process requirements of curing film detection and completely meets the customer requirements.
The pretreatment process in the hub coating method shortens the product cleaning time and improves the production efficiency by about 10 percent. The existing hub coating method needs to consider the factors of paint breakdown of turning of a liquid paint layer and a base powder layer during turning, the hub coating method provided by the invention needs no consideration of paint breakdown of an oil-free paint layer, the overall qualification rate of products is improved by about 2%, 2 ten thousand waste products are eliminated every year by calculating 100 ten thousand production lines, the coating processing cost of each product is calculated according to 25 yuan, and the cost is saved by 50 ten thousand yuan every year. The existing hub coating method aims at solving the problem of orange peel appearance caused by leveling and reflection of liquid paint, and the hub coating method provided by the invention cancels direct spraying of a paint layer, has no liquid reflection layer, and is easy to control the product appearance. According to the coating method of the hub, the curing temperature of the effect coating is 177 ℃, the curing time is 17-20Min, and the curing time is prolonged to achieve complete curing of the coating. The existing hub coating method has strict requirements on inspection of a finished product liquid paint layer, and the coating in the hub coating method provided by the invention comprises a base coating and an effect coating, so that the interference of an intermediate layer is eliminated, and the product performance is obviously improved.
Drawings
Fig. 1 is a flowchart of a hub painting method of the present invention.
Detailed Description
The invention is described in further detail below with reference to the following figures and detailed description:
as shown in fig. 1, a specific example of the hub coating method of the present invention includes the following steps: the method comprises a pretreatment process, a bottom powder spraying process of the color epoxy polyester filler, a finish turning process and a transparent powder spraying process.
In this embodiment, the pretreatment process includes the following steps: the aluminum alloy wheel hub is subjected to hot water washing, pre-degreasing, water washing, main degreasing, water washing, acid washing, pure water washing, chromium-free passivation and pure water washing, and then is subjected to baking in an oven and cooling in a cold air chamber to complete pretreatment. Specifically, adopt the annular to wash the chain and spray and wash, wash and dry once through: the full line chain speed is set as: 3.5M/Min. The method comprises the steps of online blank detection, hot water washing at 1.2Mpa for 1.5Min, pre-degreasing washing at 1.2Mpa for 2Min, degreasing washing at 1.5Mpa for 2Min, tap water washing at 1.2Mpa for 1.5Min, tap water washing at 1.2Mp for 2Min, mixed solution of dilute nitric acid at 0.8Mpa for 5% for 2Min, pure water washing at 1.5Mpa for 1.5Min, zirconium-titanium system reagent washing at 0.8Mpa for film formation at 1.5Min, pure water washing at 1.5Mpa for 2Min, pure water washing at 1.5Mpa for 1.5Min, duckbill air knife washing at 0.5Mpa for 3Min, and hot air drying at 120 ℃ for 45Min at 0.3 Mpa. And (3) entering the next procedure within 20Min after the completion, enabling the product not to be touched, automatically transferring by using a mechanical arm, performing destructive film forming quick detection on the products in batches by sampling, polishing three symmetrical circular areas with the diameter of 20MM on the cleaning surface by using a CUSO4 reagent and 800# abrasive paper for detection, titrating the reagent, and titrating the three areas in the non-polished areas. Observing the color, wherein the non-polished area 2Min does not change the color to indicate that the product is qualified in film forming, entering the next procedure, and otherwise, carrying out rework treatment. And observing the film forming effect by a simple method, continuously producing every 4H/time, specifically continuously washing the surface to be detected by pure water, ensuring that the whole surface to be detected is completely soaked, observing whether the water film is continuous or not, if the water film is continuous, judging that the surface is cleaned, if the water film is broken at a certain position, judging that the surface is not cleaned. And (5) judging that the product which is not cleaned is unqualified, and performing rework treatment. The conductivity of tap water used in the pretreatment process is less than or equal to 800 mu S/cm, and the PH value is controlled between 6 and 7; the conductivity of the pure water is less than or equal to 10 mu S/cm, and the PH value is controlled between 6 and 7.
In this embodiment, the process of spraying the color epoxy polyester filler base powder includes the following steps: in the powder spraying room, the epoxy polyester pure-color powder coating or the epoxy polyester colorful powder coating enables charged powder to be freely and uniformly adsorbed on the surface of the hub under the action of compressed air and static electricity by the principle of high-voltage electrostatic spraying; uniformly leveling and curing the epoxy polyester pure-color powder coating or the powdered epoxy polyester colorful powder coating by a powder oven to form a matrix coating, wherein the thickness of the matrix coating is 90-120 mu m; the curing time is as follows: 15-22 minutes, the fixed temperature is: and carrying out 15-20Min cooling on the wheel hub by using 80000-. Specifically, the spraying process of the color epoxy polyester filler bottom powder is automatically completed by adopting a spraying chain and a curing chain, line turning is performed by adopting a contact type four-claw positioning robot line turning operation, and the speed of the whole line chain is set to be 3-3.6M/Min. The cleaned blank is automatically transferred by a robot in a dust-free workshop and the product is horizontally placed on a brace with the right side facing upwards, and the brace is made of 304 stainless steel or aluminum alloy and has good conductivity and grounding performance. And (3) placing a non-spraying range protection block on the hub, enabling the hub to automatically enter an electrostatic dust chamber 2Min, and confirming the spraying color by an image recognition wheel type for 20S. The robot snatchs different products according to identification information and gets into parallelly connected automatic powder spray booth (pure colour and colored separately), and whitewashed room temperature, humidity requirement: the temperature is less than or equal to 30 ℃, the relative humidity is less than or equal to 75%, and the 15-19-inch universal spraying parameters of the wheel hub of the passenger car are as follows: voltage: 35-45KV, 40-70 mu A of current, 4-4.5 Nm/h of compressed air and 50-80g/min of powder spraying amount, and spraying at different angles by adopting 5-8 static guns and 15-25CM away from the workpiece. After the protective plug is removed, the spraying effect is manually checked, and the defects of spraying leakage, accumulation, impurities and the like exist. And positioning the rim contact part by four claws of the robot to grab the product and transfer the product to a curing chain, keeping the curing time at 15-22 minutes, keeping the fixing temperature at 175-180 ℃, forcibly cooling the curing outlet by 80000-100000m and 20 ℃ cooling air for 15-20Min, and then transferring the product to the room temperature. And then, the automatic material removing machine transfers the hub to an inspection process or a transparent powder process. Checking the spraying thickness to be 90-120 mu m, checking defects such as impurities, sagging, uneven spraying, color difference and the like, and turning down a chromatography product to a finish turning process; the pure color product is directly transferred to the transparent powder process at the automatic stripping station through a logistics system. And performing rework treatment on the unqualified product. After the process is finished, destructive testing is carried out on the film forming performance: the dry film adhesive force requirement of 1 piece/H product is more than or equal to GT1 level (the front film forming face adopts a blade to carve 1MM11 grids, the grids are uniformly stuck by a 3M adhesive tape, the adhesive tape is torn off by vertically upward pulling force, the adhesive tape and the damaged grids are observed to be 99% free of falling off), and the wet film adhesive force requirement of 1 piece/H product is more than or equal to GT1 level; 1 piece/H adopts a D65 light source and uses a 45-degree color difference meter for comparison standard, and the requirement is that delta E is less than or equal to 1; 1 piece/H hardness test, and the minimum hardness is HB pencil. CASS (copper acetate accelerated salt spray test) is carried out on the film-forming performance for 1 batch/time, and the sum of bilateral corrosion of the engraved part is required to be less than 2.5 MM. And (4) warehousing the qualified final products in the test, failing to test, tracing the products according to the test batch, and scrapping all the unqualified products.
In this embodiment, the finish turning process uses a finish turning machine to process the special color register part required by the customer. Specifically, MASTER-CAM software is adopted to write a unique processing path according to the profile of the front surface of the hub, the turning depth is between 0.2MM and 0.8MM, and the purpose is to turn an aluminum substrate for highlighting the effect of a chromatography finished product. Tool precision of the numerical control lathe: the end jump of the fixed supporting block is less than or equal to 0.05 mm; the diameter jump of the self-centering block is less than or equal to 0.1 mm; the radial jump of the centering shaft is less than or equal to 0.03 mm. The actual rotating speed is 1000-2000 r/min; feeding amount: finish turning front and rim circular arc 0.1-0.2 (diamond turning: 0.12-0.15 mm/r. turning part requirement and non-turning part transition smooth, invisible obvious tool receiving trace, roughness control in 6-8 grade Ra3.2-0.8, after turning, 100% size inspection to turning part, according with drawing requirement, passing to next procedure, unqualified and doing rework or scrap treatment.
In this embodiment, the transparent powder spraying process includes the following steps: in the powder spraying room, the acrylic powder coating enables charged powder to be freely and uniformly adsorbed on a solidified substrate coating on the surface of a hub under the action of compressed air and static electricity by a high-voltage electrostatic spraying principle; uniformly leveling and curing the acrylic acid powder coating through a powder oven to form an effect coating, wherein the thickness of the effect coating is 80-100 mu m; the solidification time is 17-25 minutes, the fixed temperature is 180-. Specifically, the transparent powder spraying process is automatically completed by adopting a spraying chain and a curing chain, line turning is carried out by adopting a contact type four-claw positioning robot line turning operation, and the speed of the whole line chain is set to be 3-3.6M/Min. The hub with the right side facing upwards and subjected to finish machining is transported and horizontally placed on a product brace by a robot in a dust-free workshop, the brace is made of 304 stainless steel or aluminum alloy, and good conductive performance and grounding performance are required. The protective block is placed in the non-spraying range, the electrostatic dust collection chamber 2Min is automatically entered, and the mixed line enters the automatic powder spraying chamber. The temperature and humidity requirements of the powder room are as follows: the temperature is less than or equal to 30 ℃, the relative humidity is less than or equal to 75%, and the 15-19-inch universal spraying parameters of the wheel hub of the passenger car are as follows: voltage: 40-50KV, 50-75 muA in current, 4-4.5 Nm/h in compressed air and 60-80g/min in powder spitting amount. Spraying at different angles by adopting 4-6 electrostatic guns which are 15-20CM away from the workpiece. And (4) disassembling the protection plug and manually checking the spraying effect, and judging whether the defects of spraying leakage, accumulation, impurities and the like exist. And grasping the product by positioning the wheel rim contact part through four claws of the robot, transferring the product to a curing chain, keeping the curing time at 188 ℃ and 17-25 minutes, and forcibly cooling the wheel hub by 80000 and 100000m for carrying out power transmission/H and cooling wind at 20 ℃ for 15-20 Min. The automatic material removing machine transfers the wheel hub to the inspection process: and checking whether the thickness of the single layer of the effect coating is 80-100 mu m, and whether the thickness of the effect coating and the thickness of the base body coating are 170-220 mu m, so as to check the appearance of the finished product, and performing rework treatment on the unqualified product.
In this embodiment, after the transparent powder spraying process is completed, a destructive test of the film forming property is required: the adhesion force requirement of the single coating/composite coating dry film of 1 piece of H product is more than or equal to GT1 level (the front film forming face adopts a blade to carve 1MM11 squares and is uniformly stuck by a 3M adhesive tape, the adhesive tape is torn off by vertically upward pulling force, the adhesive tape and a damaged grid are observed to have no 99% fall off), and the adhesion force requirement of the single coating/composite coating wet film of 1 piece of H product is more than or equal to GT1 level; at room temperature, 1 piece/H product is tested for hardness, and the minimum hardness is HB type pencil. 1 piece/H adopts a D65 light source and uses a 45-degree color difference meter for comparison standard, and the requirement is that delta E is less than or equal to 1; CASS (copper acetate accelerated salt spray test) is carried out on the film-forming performance for 1 batch/time, and the sum of bilateral corrosion of the engraved part is required to be less than 2.5 MM. The film-forming properties were tested by gravel impact for 1 lot/time, using a gravel jet apparatus at-20 ℃, the spalling area = a X b industrial diamond at 130 ± 15Km/h, 5 shots. After the test, the peeling area of the paint film is less than 0.5mm2 on average and less than 0.65mm2 at maximum. If the first finished product needs to be subjected to the following tests in the new product authentication stage, the process and the material stability are verified: warm water immersion test, broken stone impact resistance test, heat resistance period test, linear corrosion test, composite corrosion test, weather corrosion resistance, gasoline resistance, alkali coloring resistance, acid coloring resistance, antirust agent resistance, brake fluid resistance, car washing resistance and shipment resistance. Before the product enters the package, the test is qualified, the authorized production permission of a client is obtained, the qualified product is identified, and the product is packaged according to the requirement of the client; and (5) unqualified test, tracing the products according to the test batch, and discarding all unqualified products.
Compared with the hub coating method in the prior art, the hub coating method provided by the invention has the advantages that (1) the existing hub coating method has no color requirement, the base powder has the effect of improving the surface smoothness and the adhesion performance of the product, and the hub coating method provided by the invention puts forward the color requirement and higher appearance requirement on the base powder spraying on the original basis. (2) The existing hub coating method requires curing at 177 ℃ for 10-15Min, and the hub coating method prolongs the curing time to achieve complete curing of the coating. (3) The existing hub coating method is directly transferred to liquid paint line spraying, the hub coating method of the invention cancels the technological processes of colored paint spraying and colored paint curing, about 1/4 investment of line bodies can be reduced, about 5000 ten thousand yuan of line bodies can be reduced by taking 100 ten thousand aluminum alloy hub coating production lines as an example, 1250 ten thousand investment can be reduced, and VOC emission, solid waste emission and the like of acrylic acid liquid paint adopted in the traditional aluminum alloy hub coating process are eliminated, so that the hub coating is more environment-friendly. (4) The existing hub coating method has no performance detection requirement of a base powder curing film, and the hub coating method provided by the invention increases the whole set of process requirements of curing film detection and completely meets the customer requirements.
The pretreatment process in the hub coating method shortens the product cleaning time and improves the production efficiency by about 10 percent. The existing hub coating method needs to consider the factors of paint breakdown of turning of a liquid paint layer and a base powder layer during turning, the hub coating method provided by the invention needs no consideration of paint breakdown of an oil-free paint layer, the overall qualification rate of products is improved by about 2%, 2 ten thousand waste products are eliminated every year by calculating 100 ten thousand production lines, the coating processing cost of each product is calculated according to 25 yuan, and the cost is saved by 50 ten thousand yuan every year. The existing hub coating method aims at solving the problem of orange peel appearance caused by leveling and reflection of liquid paint, and the hub coating method provided by the invention cancels direct spraying of a paint layer, has no liquid reflection layer, and is easy to control the product appearance. According to the coating method of the hub, the curing temperature of the effect coating is 177 ℃, the curing time is 17-20Min, and the curing time is prolonged to achieve complete curing of the coating. The existing hub coating method has strict requirements on inspection of a finished product liquid paint layer, and the coating in the hub coating method provided by the invention comprises a base coating and an effect coating, so that the interference of an intermediate layer is eliminated, and the product performance is obviously improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. A hub coating method is characterized by comprising the following steps: the method comprises the following steps of pretreatment, bottom powder spraying of the color epoxy polyester filler, finish turning and transparent powder spraying;
the process for spraying the color epoxy polyester filler base powder comprises the following steps: in the powder spraying room, the epoxy polyester pure-color powder coating or the epoxy polyester colorful powder coating enables charged powder to be freely and uniformly adsorbed on the surface of the hub under the action of compressed air and static electricity by the principle of high-voltage electrostatic spraying; uniformly leveling and curing the epoxy polyester pure-color powder coating or the epoxy polyester colorful powder coating by a powder oven to form a matrix coating, wherein the thickness of the matrix coating is 90-120 mu m; the curing time is as follows: 15-22 minutes, the curing temperature is: and carrying out 15-20Min cooling on the wheel hub by using 80000-.
2. The coating method for a wheel hub according to claim 1, wherein the pretreatment step includes the steps of: the aluminum alloy wheel hub is subjected to hot water washing, pre-degreasing, water washing, main degreasing, water washing, acid washing, pure water washing, chromium-free passivation and pure water washing, and then is subjected to baking in an oven and cooling in a cold air chamber to complete pretreatment.
3. The coating method of the hub as claimed in claim 1, wherein the finish turning process is performed by a finish turning machine tool to machine the color coating part of the hub, and the turning depth is controlled to be 0.2 MM-0.8 MM, so as to turn the aluminum substrate and enhance the color coating effect.
4. The coating method of a wheel hub according to claim 1, wherein the transparent powder spraying process comprises the steps of: in the powder spraying room, the acrylic powder coating enables charged powder to be freely and uniformly adsorbed on a solidified substrate coating on the surface of a hub under the action of compressed air and static electricity by a high-voltage electrostatic spraying principle; uniformly leveling and curing the acrylic acid powder coating through a powder oven to form an effect coating, wherein the thickness of the effect coating is 80-100 mu m; the solidification time is 17-25 minutes, the fixed temperature is 180-.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204936684U (en) * | 2015-09-11 | 2016-01-06 | 浙江跃岭股份有限公司 | Metal-effect powder paint application aluminium alloy wheel hub |
| CN106423805A (en) * | 2016-11-28 | 2017-02-22 | 中信戴卡股份有限公司 | Aluminum alloy surface coating and method for forming coating |
| CN110252622A (en) * | 2019-06-25 | 2019-09-20 | 中信戴卡股份有限公司 | A kind of spraying method of aluminium alloy covered, aluminium alloy wheel hub and aluminium alloy wheel hub |
| CN111804549A (en) * | 2020-07-07 | 2020-10-23 | 盛旺汽车零部件（昆山）有限公司 | Hub coating process |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204936684U (en) * | 2015-09-11 | 2016-01-06 | 浙江跃岭股份有限公司 | Metal-effect powder paint application aluminium alloy wheel hub |
| CN106423805A (en) * | 2016-11-28 | 2017-02-22 | 中信戴卡股份有限公司 | Aluminum alloy surface coating and method for forming coating |
| CN110252622A (en) * | 2019-06-25 | 2019-09-20 | 中信戴卡股份有限公司 | A kind of spraying method of aluminium alloy covered, aluminium alloy wheel hub and aluminium alloy wheel hub |
| CN111804549A (en) * | 2020-07-07 | 2020-10-23 | 盛旺汽车零部件（昆山）有限公司 | Hub coating process |
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