Aluminum alloy melt tank car coating process
Technical field
The present invention relates to tank truck field of coating, specifically belong to aluminum alloy melt tank car coating process.
Background technology
Vehicle coating process generally can be divided into two large divisions: the one, and before application, metallic surface is processed, and is also pretreatment technology; The 2nd, the construction technology of application.Surface treatment mainly comprises the removing of old dope layer when removing greasy dirt, dust, the corrosion of surface of the work and carrying out repairing work etc., to improve the surface state of workpiece.Comprise according to various concrete conditions surface of the work is carried out to machining and chemical treatment, as phosphatization, oxidation and Passivation Treatment.
Existing vehicle coating process, for modern car body instructions for use, can not meet real requirement, requires further improvement.
Summary of the invention
The object of this invention is to provide a kind of aluminum alloy melt tank car coating process, coating process simple effects is good, reduces costs, and ensures the quality of products.
Technical scheme of the present invention is as follows:
A tank car coating process, includes following operating procedure:
1. cleaning, oil removing
The cleaning such as 1.1 use rags car load surface is foreign material obviously, must not obviously damage tank body and vehicle frame surface;
1. 2 workpiece enter before application, and tank body and each surface of the work are checked, for local greasy dirt, should carry out ungrease treatment, and diluent brushing is cleaned greasy dirt on greasy dirt surface, check and clean position after diluent surface drying;
2. wire drawing is processed
2.1 adopt sand papering plucking to process aluminium alloy, stainless steel surfaces, process uniformity as far as possible;
3, car load cleaning
3.1 adopt compressed air carefully to blow away the dust of surface of the work, clean out;
4. car load priming paint precoating
10cm cylinder and hairbrush are used in precoating, use and car load priming paint of the same race;
5. spray priming paint
5.1 priming paint stir well the even expense of pouring out with clean metal bar, add solidifying priming paint agent, main paint and curing agent weight ratio 6:1, stir, add base paint special diluent, dilution rate is counted %20~25% with weight ratio again, is diluted to working viscosity aerial spraying 22~26 seconds, be coated with-4 glasss, stir;
5.2 adopt air gun spraying, and air pressure is 4~6kg/cm
2, spray gun model W-77, nozzle diameter 2.0mm, nozzle, from workpiece distance 15~25cm, is sprayed generally vertical with workpiece, and will be lived at the uniform velocity parallel of spray gun with hand rest, translational speed 0.6~0.8m/s, front 1/3 wide cut together of gland is wanted in each spraying, and the thickness that sprays paint is about 30~40 μ m;
6. the greasy benefit of car load, finish paint precoating
Sprayed after anti-corrosive primer, ability Puttying after priming paint surface drying, putty will add curing agent in proportion, after fully mixing well, could use;
7. priming paint and putty are dried
After priming paint spraying finishes, naturally dry and need to place more than 16 hours; Drying 80 ℃ dries 30 minutes;
8. car load primer surface and putty polishing
After putty is dry, with the whole polishing of 120 order sand paper, note not overexerting, do not grind metal true qualities, until touching, hand feels more smooth, tool marks, indentation after putty is criticized and scraped must polish flat;
9. car load surface topcoating
9.1 adopt " wetting, it is wet to touch " Fa, tri-roads success ,Er roads sprayings, one press polish;
After stirring evenly, the clean metal bar of 9.2 use pours out expense BU-1 finish paint, add finish paint curing agent, main paint and curing agent weight ratio 4:1, stir, standing about 10 minutes, then add BUX finish paint diluent, dilution rate counts 25~35% with weight ratio, be diluted to working viscosity 18~22s, be coated with-4 glasss, stir;
9.3 adopt air gun spraying, and air pressure is 4~6kg/cm
2, spray gun model W-77, nozzle diameter 2.0mm, nozzle is from workpiece distance 15~25cm, and spraying is general vertical with workpiece, and will live at the uniform velocity parallel of spray gun with hand rest, translational speed 0.4~0.6m/s, front 1/2 wide cut together of gland is wanted in each spraying, and the thickness of spraying paint is 40~60 μ m;
After 9.4 finish paint sprayings finish, standing levelling 10~15 minutes, enters 80 ℃, drying room and dries 40 minutes or hang more than 24 hours;
9. cross minute more than colo(u)r streak 5cm with cylindrical shell color at 5 color separation positions.
Coating process simple effects of the present invention is good, reduces costs, and ensures the quality of products, and guarantees coating performance experiment test percent of pass, can effectively improve the anticorrosion quality of this series products, the test of especially severe etching condition.
The specific embodiment
A tank car coating process, includes following operating procedure:
1. cleaning, oil removing
The cleaning such as 1.1 use rags car load surface is foreign material obviously, must not obviously damage tank body and vehicle frame surface;
1. 2 workpiece enter before application, and tank body and each surface of the work are checked, for local greasy dirt, should carry out ungrease treatment, and diluent brushing is cleaned greasy dirt on greasy dirt surface, after diluent surface drying, check and clean position, as surface still has greasy dirt, again clean;
2. wire drawing is processed
2.1 adopt sand papering plucking to process aluminium alloy, stainless steel surfaces, process uniformity as far as possible;
3, car load cleaning
3.1 adopt compressed air carefully to blow away the dust of surface of the work, clean out;
4. car load priming paint precoating
4. 10cm cylinder and hairbrush are used in 1 precoating, use and car load priming paint of the same race;
4. 2 precoating positions
5. spray priming paint
5.1 priming paint stir well the even expense of pouring out with clean metal bar, add solidifying priming paint agent, main paint and curing agent weight ratio 6:1, stir, add base paint special diluent, dilution rate is counted %20~25% with weight ratio again, is diluted to working viscosity aerial spraying 22~26 seconds, be coated with-4 glasss, stir;
5.2 adopt air gun spraying, and air pressure is 4~6kg/cm
2, spray gun model W-77, nozzle diameter 2.0mm, nozzle, from workpiece distance 15~25cm, is sprayed generally vertical with workpiece, and will be lived at the uniform velocity parallel of spray gun with hand rest, translational speed 0.6~0.8m/s, front 1/3 wide cut together of gland is wanted in each spraying, and the thickness that sprays paint is about 30~40 μ m;
6. the greasy benefit of car load, finish paint precoating
Sprayed after anti-corrosive primer, ability Puttying after priming paint surface drying, putty will add curing agent in proportion, after fully mixing well, could use;
7. priming paint and putty are dried
After priming paint spraying finishes, naturally dry and need to place more than 16 hours; Drying 80 ℃ dries 30 minutes;
8. car load primer surface and putty polishing
8.1 after putty is dry, with the whole polishing of 120 order sand paper, notes not overexerting, and does not grind metal true qualities, until hand is touched, feels more smooth, and tool marks, indentation after putty is criticized and scraped must polish flat.
8. 2 dozens of glue and beat glue position:
9. car load surface topcoating
9.1 adopt " wetting, it is wet to touch " Fa, tri-roads success ,Er roads sprayings, one press polish;
After stirring evenly, the clean metal bar of 9.2 use pours out expense BU-1 finish paint, add finish paint curing agent, main paint and curing agent weight ratio 4:1, stir, standing about 10 minutes, then add BUX finish paint diluent, dilution rate counts 25~35% with weight ratio, be diluted to working viscosity 18~22s, be coated with-4 glasss, stir;
9.3 adopt air gun spraying, and air pressure is 4~6kg/cm
2, spray gun model W-77, nozzle diameter 2.0mm, nozzle is from workpiece distance 15~25cm, and spraying is general vertical with workpiece, and will live at the uniform velocity parallel of spray gun with hand rest, translational speed 0.4~0.6m/s, front 1/2 wide cut together of gland is wanted in each spraying, and the thickness of spraying paint is 40~60 μ m;
After 9.4 finish paint sprayings finish, standing levelling 10~15 minutes, enters 80 ℃, drying room and dries 40 minutes or hang more than 24 hours;
9. cross minute more than colo(u)r streak 5cm with cylindrical shell color at 5 color separation positions.
Technical term specific definition in technical solution of the present invention is:
1. wetting, it is wet to touch: refer in order to reach thickness and the surface gloss requirement of regulation, once spraying cannot meet the requirements of in situation, and a kind of operational method of employing, after same coating first spraying finishes, is treated its surface drying, starts to spray second time;
2. rifle distance: spray gun rifle mouth is to the vertical range of surface of the work;
3. press rifle: because paint is actual by the covering of the fan after spray gun atomization, be oval, after spraying, the paint film at two ends is thin, thick middle, in order to make paint film even, after adopting during spraying, a rifle is pushed down the method for last rifle, guarantees to obtain uniform thickness, and while generally spraying, pressing rifle amplitude is 1/3~1/4, if obtain thicker coating, pressing rifle amplitude is 1/2, surpasses this ratio and reaches one rifle width and spray at twice o'clock, this kind of spraying method or go out paint amount and cannot meet construction requirement.