CN117019600A - Coating process of heavy truck body - Google Patents
Coating process of heavy truck body Download PDFInfo
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- CN117019600A CN117019600A CN202310992098.2A CN202310992098A CN117019600A CN 117019600 A CN117019600 A CN 117019600A CN 202310992098 A CN202310992098 A CN 202310992098A CN 117019600 A CN117019600 A CN 117019600A
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- truck body
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- heavy truck
- electrophoresis
- washing
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- 238000000576 coating method Methods 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 claims abstract description 62
- 238000001962 electrophoresis Methods 0.000 claims abstract description 59
- 238000005406 washing Methods 0.000 claims abstract description 58
- 239000011248 coating agent Substances 0.000 claims abstract description 57
- 239000003973 paint Substances 0.000 claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 48
- 230000008569 process Effects 0.000 claims abstract description 35
- 238000001035 drying Methods 0.000 claims abstract description 34
- 238000005238 degreasing Methods 0.000 claims abstract description 33
- 238000007689 inspection Methods 0.000 claims abstract description 18
- 239000003292 glue Substances 0.000 claims abstract description 17
- 229910052751 metal Inorganic materials 0.000 claims abstract description 15
- 239000002184 metal Substances 0.000 claims abstract description 15
- 238000005498 polishing Methods 0.000 claims abstract description 14
- 239000002966 varnish Substances 0.000 claims abstract description 13
- 238000004026 adhesive bonding Methods 0.000 claims abstract description 11
- 230000003750 conditioning effect Effects 0.000 claims abstract description 11
- 238000005201 scrubbing Methods 0.000 claims abstract description 11
- 238000004140 cleaning Methods 0.000 claims abstract description 10
- 230000000903 blocking effect Effects 0.000 claims abstract description 9
- 239000012535 impurity Substances 0.000 claims description 10
- 239000007921 spray Substances 0.000 claims description 10
- 239000004744 fabric Substances 0.000 claims description 6
- 150000002500 ions Chemical class 0.000 claims description 6
- 230000007547 defect Effects 0.000 claims description 5
- 239000000428 dust Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 239000013043 chemical agent Substances 0.000 claims description 2
- 238000011049 filling Methods 0.000 claims description 2
- 238000007667 floating Methods 0.000 claims description 2
- 238000007517 polishing process Methods 0.000 claims description 2
- 239000011148 porous material Substances 0.000 claims description 2
- 230000003449 preventive effect Effects 0.000 claims description 2
- 239000011347 resin Substances 0.000 claims description 2
- 229920005989 resin Polymers 0.000 claims description 2
- JUWGUJSXVOBPHP-UHFFFAOYSA-B titanium(4+);tetraphosphate Chemical compound [Ti+4].[Ti+4].[Ti+4].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O JUWGUJSXVOBPHP-UHFFFAOYSA-B 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 2
- 239000003595 mist Substances 0.000 claims 1
- 239000008367 deionised water Substances 0.000 abstract description 7
- 229910021641 deionized water Inorganic materials 0.000 abstract description 7
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 238000004065 wastewater treatment Methods 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000000758 substrate Substances 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 12
- 239000002904 solvent Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000036541 health Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 239000012466 permeate Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 238000007591 painting process Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 239000012224 working solution Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000005002 finish coating Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
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
- 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
- B05D7/51—One specific pretreatment, e.g. phosphatation, chromatation, in combination with one specific coating
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/78—Pretreatment of the material to be coated
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/22—Servicing or operating apparatus or multistep processes
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Electrochemistry (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention relates to the technical field of automobile coating, and discloses a coating process of a heavy truck body, which comprises the following steps: pre-scrubbing, hanging, pre-degreasing, first washing, surface conditioning, phosphating, second washing, first pure washing, electrophoresis, UF, second pure washing, getting off, electrophoresis drying, gluing, glue drying, polishing, wiping, finish paint intermediate coating, finish paint varnish, finish paint drying, cover blocking, drawing and inspection and cross inspection. According to the coating process of the heavy truck body, through adopting the electrophoretic coating, the coating work of the heavy truck body can be completed with high efficiency and low labor force, the manual labor intensity is reduced, degreasing, surface conditioning and phosphating operations are carried out on the heavy truck body, so that a phosphating film is formed on the surface of the heavy truck body, the protection is provided for the metal of the substrate of the heavy truck body, the metal is prevented from being corroded, the service life of the heavy truck body is prolonged, the waste water treatment load of deionized water direct cleaning and discharging is avoided by adopting the UF process, and the environmental pollution is reduced.
Description
Technical Field
The invention relates to the technical field of automobile coating, in particular to a coating process of a heavy truck body.
Background
The automobile coating process can be generally divided into two major parts: firstly, surface treatment of metal before coating, also called as pretreatment technology; secondly, the construction process of coating mainly comprises the steps of removing greasy dirt, dust and rust on the surface of a workpiece, removing an old paint layer during repair operation and the like, so as to improve the surface state of the workpiece, and carrying out mechanical processing and chemical treatment, such as phosphating, oxidation and passivation treatment, on the surface of the workpiece according to various specific conditions.
In the prior art, the sheet metal parts of the automobile are often required to be coated in the production process or the use process of the automobile, automobile manufacturers are all provided with large automatic coating pipelines in the prior art, the large automatic coating pipelines are complex in structure and very high in coating cost, the sheet metal parts are coated by using a handheld spray gun of an operator in the prior art, the coating efficiency is low in the mode, the coating quality is unstable, the operator can also cause certain harm to the body health of the operator after contacting the coating for a long time, and the coating process of the heavy truck body is provided to solve the problems.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides a coating process of a heavy truck body, which has the advantages of high coating quality and the like, and solves the problems that in the existing production process or use process of an automobile, coating operation is often required to be carried out on sheet metal parts of the automobile, in the prior art, automobile manufacturers are all provided with large-scale automatic coating pipelines, the large-scale automatic coating pipelines are complex in structure and high in coating cost, the sheet metal parts are coated by using a handheld spray gun of an operator in the prior art, the coating efficiency of the mode is low, the coating quality is unstable, and the operator can cause certain harm to the health of the operator even if contacting the coating for a long time.
(II) technical scheme
In order to achieve the above purpose, the present invention provides the following technical solutions: a process for coating a heavy truck body, the process comprising the steps of: pre-scrubbing, hanging, pre-degreasing, first washing, surface conditioning, phosphating, second washing, first pure washing, electrophoresis, UF, second pure washing, getting off, electrophoresis drying, gluing, glue drying, polishing, wiping, finish paint intermediate coating, finish paint varnish, finish paint drying, cover blocking, drawing and inspection and cross inspection.
Preferably, the pre-scrubbing and the hanging process are that the body of the heavy truck is scrubbed, and after the state, the number, the color number, the plan requirement and the circulation card are confirmed according to the spraying plan sequence number, the workpiece is hung on the hanger.
Preferably, the pre-degreasing and degreasing steps are to turn on a pre-degreasing water pump and a main degreasing water pump, spray the workpiece under the pre-degreasing water pump for 60 seconds, pre-degrease the workpiece, dip the workpiece under the main degreasing water pump for 180 seconds, main degrease the workpiece, remove greasy dirt and other impurities on the inner and outer surface preventive resin filling surfaces of the sheet metal of the car body, and the pre-degreasing and main degreasing temperatures are 40-65 ℃.
Preferably, the first water washing process and the second water washing process are respectively carried out by adopting hot water and cold water to spray the surface of the workpiece at high pressure for two times, the temperature of the hot water washing is 55-65 ℃, and the water washing time is 60 seconds.
Preferably, the first pure water washing step and the second pure water washing step are respectively performed by immersing the workpiece in pure water for 60 seconds, spraying the workpiece out of the tank for 60 seconds, removing surface phosphating solution, and washing away residual chemical agents, dust mud and aluminum scraps on the workpiece.
Preferably, the surface conditioning step is to spray the workpiece under the titanium phosphate solution for 60 seconds for surface conditioning, and the phosphating step is to spray the workpiece under the phosphating solution for 180 seconds for phosphating.
Preferably, the electrophoresis process is to dip the workpiece in the electrophoresis liquid for 180 seconds, the electrophoresis temperature is 25-30 ℃, the UF process is to spray the workpiece in a UF1 outlet tank for 15 seconds, UF2 is sprayed for 30 seconds, UF3 is sprayed for 30 seconds, floating paint attached to the surface of an electrophoresis coating film is removed, the appearance of the coating film is improved, the electrophoresis coating is recycled, impurity ions are removed, the defect of pollution and speckle coating is prevented, the carrying-out amount of the coating is reduced, the UF process uses pressure of 0.1-0.6MPa, the separation pore diameter of 1nm-0.1 mu m and the molecular weight cut-off of 500-1000000, and the drying temperature in the electrophoresis drying process is 100-140 ℃.
Preferably, the glue in the gluing process is fine sealing glue, the fine sealing glue is 130Pa.s, the PVC glue is 65Pa.s, the PVC thickness is more than or equal to 700 mu m, in the polishing process, one of a polisher, a hand polishing disc and abrasive cloth is used for polishing electrophoresis defects on the surface of a vehicle body in a point polishing mode, obvious burrs, pits, scratches and the like are formed on the surface of the vehicle body, dirt and residues on the vehicle body are thoroughly removed, the surface of a shell of the vehicle body is smooth, the surface treatment is smooth, the residual foreign matters after the polishing abrasive cloth is cleaned are removed, and in the wiping process, the inner surface and the outer surface of the whole vehicle are wiped by using low-viscosity dust-binding cloth.
Preferably, in the finishing varnish working procedure, a steam varnish device is used for cleaning the paint film surface of the automobile body, so that the paint film surface of the automobile body is bright, clean and dust-free.
Preferably, the upper blanking cover process is used for checking whether the blanking utensil such as apron, link plate, support have obvious deformation, whether have serious paint film or other dirt, and the apron, link plate, the support that will warp or have serious paint film is selected the back and is placed alone and the sign is clear, guarantees that the blanking utensil can carry out effectual shielding to the coating cloud.
(III) beneficial effects
Compared with the prior art, the invention provides a coating process of a heavy truck body, which has the following beneficial effects:
1. according to the coating process of the heavy truck body, through adopting electrophoretic coating, the coating work of the heavy truck body can be completed with high efficiency and low labor force, the manual labor force is reduced, degreasing, surface conditioning and phosphating operations are carried out on the heavy truck body, so that a phosphating film is formed on the surface of the heavy truck body, the protection is provided for the metal of the base body of the heavy truck body, the metal is prevented from being corroded, the service life of the heavy truck body is prolonged, a finishing paint middle coating process is adopted, good impact resistance and scratch resistance are provided through the combination of hardness, elasticity and toughness, the wear resistance and solvent resistance of the heavy truck body are improved, the coated coating has the advantages of attractive appearance, effectiveness, low cost and environmental friendliness, and the coating has very good hardness, elasticity and toughness and wear resistance.
2. According to the coating process of the heavy truck body, phosphating solution, phosphating slag, metal ions, other impurity ions and the like on the surface of a workpiece and in an inner cavity are cleaned by using water after phosphating, meanwhile, the dripping conductivity of the workpiece after cleaning meets the requirement of an electrophoresis tank on a workpiece entering the tank, pollution to the electrophoresis tank solution is prevented, through adopting a UF process and obtaining deionized water and paint solvents from the electrophoresis tank through a UF device, washing water of an electrophoresis piece is provided to clean the surplus electrophoresis paint attached to the electrophoresis workpiece and return the electrophoresis tank, so that the electrophoresis paint carried out on the surface of the workpiece can be recycled, closed-loop circulation is realized, 30% of cost for purchasing the electrophoresis paint is saved for enterprises, and part of UF solution can be discharged, impurity ions brought into the electrophoresis tank in the painting process are removed, so that the impurity content of the electrophoresis tank working solution is kept within the conductivity and pH value range specified by the process, the UF solution is recycled to replace deionized water as washing water of the workpiece after electrophoresis, the electrophoresis paint is basically not discharged, the waste water treatment load of direct washing of deionized water is avoided, and environmental pollution is lightened.
Drawings
Fig. 1 is a flow chart of a coating process of a heavy truck body.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The coating process flow chart of the heavy truck body is shown in figure 1.
Example 1:
the coating process of the heavy truck body comprises the following steps of: pre-scrubbing, hanging, pre-degreasing, first washing, surface conditioning, phosphating, second washing, first pure washing, electrophoresis, UF, second pure washing, getting off, electrophoresis drying, gluing, glue drying, polishing, wiping, finish paint intermediate coating, finish paint varnish, finish paint drying, cover blocking, drawing and inspection and cross inspection.
The pre-scrubbing, hanging piece, getting off, gluing, glue drying, wiping, finishing paint varnish, finishing paint drying, upper blanking cover, drawing inspection and cross inspection procedures are operated according to normal processes, the temperatures of the pre-degreasing and degreasing procedures are 40 ℃, the hot water washing temperature in the first water washing procedure and the hot water washing temperature in the second water washing procedure are 55 ℃, the temperature of the electrophoresis procedure is 25 ℃, the using pressure of the UF procedure is 0.1MPa, the separation aperture is 1nm, the molecular weight cut-off is 500, and the drying temperature in the electrophoresis drying procedure is 100 ℃.
Example 2:
the coating process of the heavy truck body comprises the following steps of: pre-scrubbing, hanging, pre-degreasing, first washing, surface conditioning, phosphating, second washing, first pure washing, electrophoresis, UF, second pure washing, getting off, electrophoresis drying, gluing, glue drying, polishing, wiping, finish paint intermediate coating, finish paint varnish, finish paint drying, cover blocking, drawing and inspection and cross inspection.
The pre-scrubbing, hanging piece, getting off, gluing, glue drying, wiping, finishing paint varnish, finishing paint drying, upper blanking cover, drawing inspection and cross inspection procedures are operated according to normal processes, the temperatures of the pre-degreasing and degreasing procedures are 50 ℃, the hot water washing temperature in the first water washing procedure and the hot water washing temperature in the second water washing procedure are 60 ℃, the temperature of the electrophoresis procedure is 27 ℃, the using pressure of the UF procedure is 0.3MPa, the separation aperture is 50nm, the molecular weight cut-off is 500000, and the drying temperature in the electrophoresis drying procedure is 120 ℃.
Example 3:
the coating process of the heavy truck body comprises the following steps of: pre-scrubbing, hanging, pre-degreasing, first washing, surface conditioning, phosphating, second washing, first pure washing, electrophoresis, UF, second pure washing, getting off, electrophoresis drying, gluing, glue drying, polishing, wiping, finish paint intermediate coating, finish paint varnish, finish paint drying, cover blocking, drawing and inspection and cross inspection.
The pre-scrubbing, hanging piece, getting off, gluing, glue drying, wiping, finishing paint varnish, finishing paint drying, upper blanking cover, drawing inspection and cross inspection procedures are operated according to normal processes, the temperatures of the pre-degreasing and degreasing procedures are 65 ℃, the hot water washing temperature in the first water washing procedure and the hot water washing temperature in the second water washing procedure are 65 ℃, the temperature of the electrophoresis procedure is 30 ℃, the using pressure of the UF procedure is 0.6MPa, the separation aperture is 0.1 mu m, the molecular weight cut-off is 1000000, and the drying temperature in the electrophoresis drying procedure is 140 ℃.
In the embodiment, in the UF procedure, the following steps are performed:
1) Confirming that no pressure exists on the outlet pipeline, and closing a paint supply valve, a cleaning inlet valve, a cleaning outlet valve and valves for transmitting the liquid to the storage tank and the cleaning tank;
2) Opening a paint circulation valve, a permeate discharge valve and all pressure gauge isolation valves;
3) Opening an ultrafiltration pump shaft seal cooling liquid inlet and outlet valve (the pressure is 0.2 MPa);
4) Starting a paint supply pump;
5) A micro-opening paint inlet to slowly inject paint into the system;
6) Slowly opening a paint inlet valve until the pressure on a base line reaches 0.15MPa, and then opening a pump;
7) Slowly adjusting the inlet valve and the outlet valve until the pressure difference reaches 0.2MPa, wherein the pressure of the inlet and the outlet is respectively 0.35MPa and 0.15MPa;
8) Checking whether the membrane leaks or not, and if the membrane still leaks, timely replacing the O-shaped sealing ring and the membrane group;
9) The discharge time of the permeate should be at least 10min;
10 A valve for permeate to the storage means is opened and then the separated liquid discharge valve is closed.
Wherein, the pressure difference between the inlet and the outlet of the filter should be less than 0.08MPa, if the pressure difference is more than 0.08MPa, the filter bag should be replaced in time, the filtering precision is less than or equal to 25 mu m, and the drip conductivity of the last flushing before entering the electrophoresis tank should be lower than 10us/cm.
In summary, the coating process of the heavy truck body can finish the coating work of the heavy truck body with high efficiency and low labor force by adopting the electrophoretic coating, reduces the manual labor intensity, simultaneously, degreasing, surface conditioning and phosphating are carried out on the heavy truck body to form a phosphating film on the surface of the heavy truck body, protect the matrix metal of the heavy truck body, prevent the metal from being corroded, improve the service life of the heavy truck body, and adopt a finish coating process, provide good impact resistance and scratch resistance by combining hardness, elasticity and toughness, improve the wear resistance and solvent resistance of the heavy truck body, so that the coated coating has the advantages of attractive appearance, effectiveness, low cost and environmental friendliness, and has very good hardness, elasticity and toughness and wear resistance.
In addition, the surface of the workpiece, phosphating solution, phosphating slag, metal ions, other impurity ions and the like of the inner cavity are cleaned by the water washing after phosphating, meanwhile, the dripping conductivity of the workpiece after cleaning meets the requirement of the electrophoresis tank on the workpiece entering the tank, the pollution to the electrophoresis tank solution is prevented, through adopting the UF procedure, the solvent of deionized water and paint is obtained from the electrophoresis tank through a UF device, the washing water of the electrophoresis piece is provided for cleaning the surplus electrophoresis paint attached on the electrophoresis workpiece and returns to the electrophoresis tank, thus the electrophoresis paint carried out on the surface of the workpiece can be recycled, closed cycle is realized, 30 percent of cost for purchasing the electrophoresis paint is saved for enterprises, and part of the UF solution can be discharged, the impurity ions brought into the electrophoresis tank in the painting process are removed, so that the impurity content of the electrophoresis tank working solution is kept in the conductivity and pH value range specified by the process, the UF liquid is recycled to replace deionized water to serve as washing water of the workpiece after electrophoresis, electrophoretic paint is basically not discharged, waste water treatment load of direct washing and discharging of the deionized water is avoided, environmental pollution is reduced, the problem that in the existing production process or use process of an automobile, a sheet metal part of the automobile is often required to be coated is solved, in the prior art, automobile manufacturers are all provided with large-scale automatic coating assembly lines, the large-scale automatic coating assembly lines are complex in structure and high in coating cost, in the prior art, operators are used for coating the sheet metal part by using handheld spray guns of the operators, the coating efficiency is low, the coating quality is unstable, and the operators can also cause certain harm to the body health of the operators after contacting the coating for a long time.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The coating process of the heavy truck body is characterized by comprising the following steps of: pre-scrubbing, hanging, pre-degreasing, first washing, surface conditioning, phosphating, second washing, first pure washing, electrophoresis, UF, second pure washing, getting off, electrophoresis drying, gluing, glue drying, polishing, wiping, finish paint intermediate coating, finish paint varnish, finish paint drying, cover blocking, drawing and inspection and cross inspection.
2. The process for coating the heavy truck body according to claim 1, wherein the pre-scrubbing and hanging processes are that the heavy truck body is scrubbed, and the work piece is hung on the hanger after confirming the state, the number, the color number, the planning requirement and the circulation card according to the spraying planning sequence number.
3. The heavy truck body coating process according to claim 1, wherein the pre-degreasing and degreasing steps are that a pre-degreasing water pump and a main degreasing water pump are turned on, a workpiece is sprayed under the pre-degreasing water pump for 60 seconds to perform pre-degreasing, the workpiece is immersed for 180 seconds under the main degreasing water pump to perform main degreasing, oil stains and other impurities on the inner and outer surface preventive resin filling surfaces of sheet metal of the truck body are removed, and the pre-degreasing and main degreasing temperatures are 40-65 ℃.
4. The process for coating a heavy truck body according to claim 1, wherein the first washing step and the second washing step are respectively performed by washing the surface of the workpiece with hot water and cold water twice before and after a high-pressure spraying mode, the hot water washing temperature is 55-65 ℃, and the washing time is 60 seconds.
5. The process for coating a heavy truck body according to claim 1, wherein the first pure water washing step and the second pure water washing step are respectively performed by immersing the workpiece in pure water for 60 seconds, spraying the workpiece out of the tank for 60 seconds, removing surface phosphating solution, and washing away residual chemical agents, dust mud and aluminum scraps on the workpiece.
6. The process for coating a heavy truck body according to claim 1, wherein the surface adjustment procedure is to spray a workpiece under a titanium phosphate solution for 60 seconds for surface adjustment, and the phosphating procedure is to spray a workpiece under a phosphating solution for 180 seconds for phosphating.
7. The heavy truck body coating process according to claim 1, wherein the electrophoresis process is that a workpiece is immersed in the electrophoresis liquid for 180 seconds, the electrophoresis temperature is 25-30 ℃, the UF process is that the workpiece is sprayed for 15 seconds in a UF1 outlet tank, UF2 is sprayed for 30 seconds, UF3 is sprayed for 30 seconds, floating paint attached to the surface of an electrophoresis coating film is removed, the appearance of the coating film is improved, electrophoresis coating materials are recycled, impurity ions are removed, the defect of a pollution and spot coating film is prevented, the carry-out amount of the coating materials is reduced, the UF process uses pressure of 0.1-0.6MPa, the separation pore diameter of 1nm-0.1 μm, the molecular weight cut-off is 500-1000000, and the drying temperature in the electrophoresis drying process is 100-140 ℃.
8. The coating process of the heavy truck body according to claim 1, wherein the glue in the gluing process is fine sealing glue, the fine sealing glue is 130pa.s, the PVC glue is 65pa.s, the PVC thickness is more than or equal to 700 μm, in the polishing process, one of a polisher, a hand polishing disc and a abrasive cloth is used for polishing electrophoresis defects of the electrophoresis truck body in a point polishing mode, obvious burrs, pits, scratches and the like are formed on the surface of the truck body, dirt and residues on the truck body are thoroughly removed, the surface of a shell of the truck body is guaranteed to be smooth, the surface is treated to be smooth, the residual foreign matters after the polishing abrasive cloth is cleaned are removed, and in the cleaning process, the inner surface and the outer surface of the whole truck are cleaned by using low-viscosity dust-binding cloth.
9. The process for coating a heavy truck body according to claim 1, wherein a vapor varnish device is used for cleaning the paint film surface of the body in the finish varnish process, so that the paint film surface of the body is bright, clean and dust-free.
10. The coating process of the heavy truck body according to claim 1, wherein the upper blocking cover procedure is used for checking whether blocking tools such as a cover plate, a hanging plate and a support are obviously deformed, whether serious paint films or other dirt exist, and the cover plate, the hanging plate and the support which are deformed or have the serious paint films are singly placed and marked clearly after being selected, so that the blocking tools can effectively block paint mist.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310992098.2A CN117019600A (en) | 2023-08-08 | 2023-08-08 | Coating process of heavy truck body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310992098.2A CN117019600A (en) | 2023-08-08 | 2023-08-08 | Coating process of heavy truck body |
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| Publication Number | Publication Date |
|---|---|
| CN117019600A true CN117019600A (en) | 2023-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310992098.2A Pending CN117019600A (en) | 2023-08-08 | 2023-08-08 | Coating process of heavy truck body |
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| Country | Link |
|---|---|
| CN (1) | CN117019600A (en) |
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2023
- 2023-08-08 CN CN202310992098.2A patent/CN117019600A/en active Pending
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