CN114381781A - Surface coating process for radiator for transformer - Google Patents
Surface coating process for radiator for transformer Download PDFInfo
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- CN114381781A CN114381781A CN202111542014.2A CN202111542014A CN114381781A CN 114381781 A CN114381781 A CN 114381781A CN 202111542014 A CN202111542014 A CN 202111542014A CN 114381781 A CN114381781 A CN 114381781A
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- 238000000576 coating method Methods 0.000 title claims abstract description 38
- 238000005507 spraying Methods 0.000 claims abstract description 72
- 238000001962 electrophoresis Methods 0.000 claims abstract description 37
- 238000001035 drying Methods 0.000 claims abstract description 26
- 239000011248 coating agent Substances 0.000 claims abstract description 22
- 238000011282 treatment Methods 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 239000004033 plastic Substances 0.000 claims abstract description 5
- 229920003023 plastic Polymers 0.000 claims abstract description 5
- 239000002912 waste gas Substances 0.000 claims abstract description 3
- 239000000843 powder Substances 0.000 claims description 64
- 230000007246 mechanism Effects 0.000 claims description 25
- 239000003973 paint Substances 0.000 claims description 22
- 238000005422 blasting Methods 0.000 claims description 14
- 239000011347 resin Substances 0.000 claims description 10
- 229920005989 resin Polymers 0.000 claims description 10
- 239000010960 cold rolled steel Substances 0.000 claims description 6
- 238000001704 evaporation Methods 0.000 claims description 6
- 230000008020 evaporation Effects 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 230000017525 heat dissipation Effects 0.000 claims description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 5
- 238000007654 immersion Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 230000003750 conditioning effect Effects 0.000 claims description 3
- 238000005238 degreasing Methods 0.000 claims description 3
- 239000004519 grease Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 230000003449 preventive effect Effects 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 10
- 230000007797 corrosion Effects 0.000 abstract description 7
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 238000011161 development Methods 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 2
- 239000007921 spray Substances 0.000 description 7
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 5
- 238000005246 galvanizing Methods 0.000 description 5
- 229910052725 zinc Inorganic materials 0.000 description 5
- 239000011701 zinc Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000004922 lacquer Substances 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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Classifications
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- 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
- C25D13/12—Electrophoretic coating characterised by the process characterised by the article coated
-
- 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
- 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
- B05D7/24—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 for applying particular liquids or other fluent materials
-
- 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
- C25D13/20—Pretreatment
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a surface coating process of a radiator for a transformer, which comprises the following steps: 1) pretreatment of a radiator; 2) electrophoretic pretreatment; 3) electrophoresis; 4) drying; 5) spraying plastics; 6) curing, which replaces the conventional surface coating treatment process of the radiator; compared with the existing coating treatment process, the surface coating process of the radiator for the transformer, provided by the invention, not only improves the mechanical strength and the corrosion resistance of the surface of a workpiece, but also greatly reduces waste gas and waste liquid generated in the coating process, and realizes the long-acting corrosion resistance requirement of product coating and the development targets of environmental protection and energy saving of enterprises.
Description
The technical field is as follows:
the invention relates to the field of manufacturing of radiators for transformers, in particular to a surface coating process for a radiator for a transformer.
Background art:
the radiator is used for heat dissipation of the transformer, and due to the particularity of the working environment, the durability and long-term effectiveness of the radiator become important performance considerations, so that the rust prevention and corrosion prevention of the radiator become important research subjects.
At present, the common anti-corrosion measures of the radiator for the oil-immersed transformer are as follows: performing hot dip galvanizing treatment, namely performing pretreatment, dipping in plating assistant solution, drying and preheating, hot dip galvanizing, finishing, cooling, passivating, rinsing, drying and inspecting on the surface of the radiator, and performing electrochemical action of a surface zinc layer to achieve anti-corrosion protection on the radiator; the surface of the radiator is subjected to pretreatment, primer spraying, leveling drying, finish paint spraying, leveling drying and inspection, and the surface paint film has an effect of shielding the environment so as to achieve the anti-corrosion protection of the radiator; hot dip galvanizing and paint spraying, wherein the surface of the radiator is subjected to the processes of hot dip galvanizing treatment, grinding, spraying, drying and inspection, so that the surface of a workpiece forms multilayer anti-corrosion protection.
In the anticorrosion measures, the radiator is subjected to hot dip galvanizing treatment, so that zinc slag on the surface of the zinc liquid is easy to flow and hang on the surface and the edge of the workpiece after the workpiece is subjected to zinc liquid discharge, and the appearance and the corrosion resistance requirements of the product are seriously influenced; the radiator is painted, the surface tension of a paint film at each position of a workpiece is different, so that the thickness of the paint film is uneven, and the corrosion resistance and the impact resistance of a product are poor; although the surface coating of the radiator subjected to the zinc immersion painting treatment has certain weather resistance and wear resistance, the radiator cannot meet the long-acting corrosion resistance requirement. The VOC emission in the paint coating also does not meet the original ecological targets of the country for the development of green environmental protection and energy conservation.
The invention content is as follows:
aiming at the problems, the invention provides a surface coating process of a radiator for a transformer, which realizes the long-acting anti-corrosion requirement of product coating and the development targets of environmental protection and energy conservation of enterprises.
The technical scheme adopted by the invention is as follows:
a surface coating process of a radiator for a transformer comprises the following steps:
the first step is as follows: performing radiator pretreatment, namely performing surface high-temperature evaporation on the radiator formed by welding the cold-rolled steel plate to remove rust preventive oil on the surface of the metal plate; and then removing the surface oxide skin through shot blasting treatment.
The second step is that: and (4) electrophoretic pretreatment, namely degreasing, washing with water, surface conditioning, phosphating and washing with water to clean the radiator in the second step to form a compact and uniform phosphating film on the surface.
The third step: and (4) electrophoresis, namely immersing the radiator in the second step into the cathode electrophoresis paint liquid to form an electrophoresis paint film with the thickness of 20-30 mu m on the surface.
The fourth step: and (5) drying, and after electrophoresis is finished, drying the surface of the radiator in a drying kiln.
The fifth step: spraying plastic, namely spraying resin powder on the surface of the radiator in the fifth step to form a resin coating with the thickness of 80-100 microns on the surface;
and a sixth step: and (5) curing, namely curing the surface coating of the radiator sprayed with the resin powder through a drying kiln.
The radiator pretreatment method comprises the following steps of heating the surface of a radiator formed by welding a cold-rolled steel plate to 210 +/-10 ℃ in a drying kiln, keeping the temperature in the kiln for 15-20 min, and discharging gas generated by grease evaporation into a waste gas treatment device through an air exhaust device in the kiln; for the radiator after high-temperature evaporationThe surface is shot-blasted, the shot-blasting material is steel shot, the diameter is 0.8 mm-1 mm, the surface scale produced by structure welding meets the surface rust removal grade Sa2.5, the shot blasting and shot blasting amount of the surface are generally continuously performed: 80kg/m2～120kg/m2The time can reach 25 s-50 s.
The third step of electrophoresis is specifically as follows, the electrophoresis adopts a cathode electrophoresis mode; tubular anodes vertically arranged are arranged on two sides of the electrophoretic paint groove, tubular anodes transversely arranged are arranged at the bottom of the electrophoretic paint groove, symmetrical tubular anodes transversely arranged are arranged at the upper part of the electrophoretic paint groove, a suspender channel for conveying workpieces is arranged in the middle of the symmetrical tubular anodes, and tubular anodes arranged in the electrophoretic paint groove are sequentially distributed along the direction of the groove body to form a multilateral long cage-shaped channel; the profile of the heat dissipation plate of the radiator is vertical to the horizontal direction, and the collecting pipes at the two ends are hung on the conveying line through hanging rods.
During electrophoresis, a radiator enters from one end of a long cage-shaped anode channel, the energizing voltage is gradually increased from 75V to 240V, and the immersion time is as follows: and (4) 120 s-180 s, and separating the radiator from the other end of the long cage-shaped anode channel to finish electrophoresis.
The drying temperature in the fourth step is 180 +/-10 ℃, and the drying time is 10-15 min.
The concrete method of the fifth step is as follows, the spraying adopts the mode of tribostatic spraying resin powder; the molded surface of the heat dissipation plate of the radiator is vertical to the horizontal direction, the collecting pipes at two ends are hung on a conveying line through a hanging rod, and the spraying device is provided with an upper powder spraying mechanism and a lower powder spraying mechanism. When spraying, the radiator passes through the powder spraying mechanism between the upper part and the lower part of the spraying device, and the powder spraying mechanism performs automatic directional powder spraying operation to the plate gap of the radiator.
The distance between the friction electrostatic powder spraying gun of the upper powder spraying mechanism and the workpiece is 100 mm-200 mm, the powder supply pressure is 0.2 MPa-0.3 MPa, and the spraying pressure is 0.1 MPa-0.2 MPa.
The distance between the friction electrostatic powder spraying gun of the lower powder spraying mechanism and the workpiece is 100 mm-200 mm, the powder supply pressure is 0.2 MPa-0.4 MPa, and the spraying pressure is 0.1 MPa-0.3 MPa.
The curing temperature of the coating in the sixth step is 210 +/-10 ℃, and the curing time is 10-15 min.
The invention has the advantages and positive effects that:
1. according to the coating process for the surface of the radiator for the transformer, disclosed by the invention, the pretreatment method of the radiator removes oil stains and welding oxide skin on the surface of the radiator welded by a cold-rolled steel plate, so that the surface obtains good surface cleanliness, and the subsequent electrophoresis treatment is more facilitated. The electrophoresis method of the radiator provides a full-coating anode electric field when the radiator is electrophoresed by a multilateral long cage constructed by a tubular anode, thereby ensuring the electric field force and the distribution uniformity, and greatly improving the corrosion resistance of the product by the characteristics of high adhesive force and high swimming transmittance; the powder spraying method of the radiator enables the powder coating to uniformly cover the surface of the radiator and a narrow space to meet the requirement of the thickness of a coating film of a product, and the mechanical strength and the long-acting corrosion resistance of the surface of the radiator are improved through the high adhesive force, the high mechanical strength and the aging resistance of the powder coating.
2. The surface coating process for the radiator for the transformer can realize highly mechanized and automated production, reduces the emission of production waste, and further promotes the production of enterprises to be pushed to the direction of safety and environmental protection.
Description of the drawings:
FIG. 1 is a view of a radiator structure;
FIG. 2 is a flow chart of heat sink electrophoresis;
FIG. 3 is a schematic diagram of a heat spreader electrophoresis method;
FIG. 4 is a flow chart of powder injection to a radiator;
FIG. 5 is a schematic diagram of a powder injection method for a radiator;
the specific implementation mode is as follows:
the invention is further illustrated by the following figures and specific examples, wherein the processes in the examples, unless otherwise indicated, are conventional.
The first step is as follows: the radiator pretreatment is shown in figure 1, and is a radiator for a transformer of a certain specification, which comprises 25 cold-rolled steel plates welded into a radiating plate, wherein the length of the radiating plate is 3600mm, the width of the radiating plate is 520mm, the plate interval is 32mm, and two ends of the radiating plate are of a collecting pipe type structure. Heating the radiator in a drying kiln to 210 ℃, and keeping the temperature in the kiln for 20 min.
After the radiator is degreased at high temperature, the opening position at the collecting pipe of the radiator is closed, and then surface shot blasting treatment is carried out, wherein the shot blasting material is steel shot, the diameter is 0.8-1 mm, and the shot blasting amount is as follows: 80kg/m2～120kg/m2The surface shot blasting time is kept for 25s to 50s, and the surface of the radiator is free from attachments such as grease, dirt, oxide scale and the like.
The second step is that: and (3) electrophoretic pretreatment, namely degreasing, washing with water, surface conditioning, phosphating and washing with water for cleaning the radiator in the second step to form a compact and uniform phosphating film on the surface, wherein the thickness of the phosphating film is 2-4 mu m.
The third step: referring to fig. 2 and 3, the plate surface of the radiator is vertical to the horizontal direction, and the header pipes at two ends are hung on a conveying line through a hanger rod; the electrophoresis method of the radiator relates to: a boat-shaped electrophoresis tank 1, a side tubular anode 2, an upper tubular anode device 3 and a bottom tubular anode 4; the side tubular anode 2 is vertically fixed on the side wall of the boat-shaped electrophoresis tank 1 through a hoop 5; the upper part of the ship-shaped electrophoresis tank 1 is provided with upper tubular anode devices 3 which are symmetrical at two sides, a special lifting appliance 7 channel for conveying a radiator 6 is reserved in the middle, and one or more upper tubular anode devices 3 are distributed along the length direction of the electrophoresis tank and are hung below a conveying line 9 through a spiral lifting appliance hanger 8; the bottom tubular anode is transversely fixed at the bottom of the ship-shaped electrophoresis tank 1 through a hoop; the side tubular anode 2, the upper tubular anode device 3 and the bottom tubular anode 4 are fully covered around the workpiece, and a connecting pipe 10 of the upper tubular anode device 3 and the bottom tubular anode 4 is led out from one side of the anode and upwards connected out along the side wall of the boat-shaped electrophoresis tank 1; during the 6 electrophoresis of radiator, get into electrophoresis lacquer liquid level 11 through transfer chain 9 from 1 one side of ship shape electrophoresis tank in, accomplish the electrophoresis under the combined action of upper portion tubular anode device 3, bottom tubular anode 4 and lateral part tubular anode 2 again and go up the membrane process, leave electrophoresis lacquer liquid level to next station afterwards.
Wherein the electrophoretic paint is cathode electrophoretic paint, the electrifying voltage is gradually increased from 75V to 240V along with the position of the radiator, and the immersion time is as follows: 120s to 180s, and an electrophoresis paint film with the thickness of 20 mu m to 30 mu m is formed on the surface.
The fourth step: and (3) drying, after electrophoresis is finished, drying the surface of the radiator 6 in a drying kiln at the drying temperature of 180 ℃ for 15min, and completely curing the electrophoresis paint film. And adjusting the surface temperature of the radiator to 50 ℃ by strong wind, and entering the next station.
The fifth step: plastic spraying, referring to fig. 4 and 5, the radiator 6 is conveyed into the powder spraying device 12 through the conveying line 9, the radiator 6 passes through the powder spraying mechanism at the upper part and the lower part of the powder spraying device 12, and the powder spraying device 12 performs automatic directional powder spraying operation to the plate gap of the radiator; the plastic spraying method of the radiator 6 relates to: the powder spraying device 12 is characterized in that an upper powder spraying mechanism 13, a lower powder spraying mechanism 14, a fixing frame 15 and a lead screw distance adjusting structure 16 are arranged in the powder spraying device 12; the fixed frames 15 are arranged at two sides of a conveying channel of the radiator 6, the upper powder spraying mechanisms 13 and the lower powder spraying mechanisms 14 are respectively arranged at the top end and the bottom end of the fixed frames 15 at two sides, and the upper powder spraying mechanisms 13 and the lower powder spraying mechanisms 14 at two sides are connected with the lead screw distance adjusting structure 16; each powder spraying device 12 is provided with one or more horizontally arranged friction electrostatic spray guns 17; after the radiator 6 is suspended below the conveying line 9 through the special lifting appliance 7 and enters the powder spraying device, the distance between the upper powder spraying mechanism 13 and the lower powder spraying mechanism 14 on the two sides is adjusted by controlling the lead screw distance adjusting structures 16 on the two sides to rotate, the powder spraying distance between the powder spraying pipe of the friction electrostatic spray gun 17 and the upper and lower outlines of a workpiece is further adjusted, the powder supply pressure and the spraying pressure of powder spraying are set, and when the radiator 6 passes between the upper powder spraying mechanism 13 and the lower powder spraying mechanism 14, the friction electrostatic spray gun 17 conducts powder spraying operation to the plate gap of the workpiece.
Wherein, the distance between the friction electrostatic spray gun 17 of the upper powder spraying mechanism 13 and the workpiece is 150mm, the powder supply pressure is 0.26MPa, and the spraying pressure is 0.14 MPa. The distance between the friction electrostatic spray gun 17 of the lower powder spraying mechanism 14 and the workpiece is 120mm, the powder supply pressure is 0.26MPa, and the spraying pressure is 0.16 MPa; suspension chain speed: 1m/min, total powder supply: 3800-4000 g/min to form a resin coating with a thickness of 80-100 μm on the surface; and (4) manually supplementing powder to the hanging point position of the radiator 6.
And a sixth step: and (3) curing, namely curing the surface coating of the radiator sprayed with the resin powder in a drying kiln at the curing temperature of 210 ℃ for 15 min.
The surface coating properties of the heat sinks of the examples are shown in table 1.
TABLE 1 radiator surface coating Performance index
| Thickness of coating film | 130μm |
| Hardness of pencil | 8H |
| Adhesion force | Level 0 |
| Resistance to salt fog | Meet the 1000h surface requirement of the I-type salt spray test |
| Resistance to artificial weather aging | Meet the 1000h surface requirement of the I-type salt spray test |
In the above embodiments, the best mode of the present invention has been described, and many variations are possible within the concept of the present invention. It is to be understood that all changes that come within the spirit of the invention are desired to be protected.
Claims (6)
1. A surface coating process of a radiator for a transformer is characterized by comprising the following steps:
the first step is as follows: performing radiator pretreatment, namely performing surface high-temperature evaporation on the radiator welded and formed by using a cold-rolled steel plate to remove rust preventive oil on the surface of the metal plate; then removing surface oxide skin through shot blasting treatment;
the second step is that: performing electrophoretic pretreatment, namely degreasing, washing with water, surface conditioning, phosphating and washing with water on the radiator in the second step to form a compact and uniform phosphating film on the surface;
the third step: electrophoresis, namely immersing the radiator in the second step into a cathode electrophoresis paint liquid to form an electrophoresis paint film with the thickness of 20-30 mu m on the surface;
the fourth step: drying, after electrophoresis is finished, drying the surface of the radiator in a drying kiln;
the fifth step: spraying plastic, namely spraying resin powder on the surface of the radiator in the fifth step to form a resin coating with the thickness of 80-100 microns on the surface;
and a sixth step: and (5) curing, namely curing the surface coating of the radiator sprayed with the resin powder in a drying kiln.
2. The surface coating process of the heat radiator for the transformer as claimed in claim 1, wherein the first step further comprises the following steps:
1) high-temperature evaporation: heating the surface of the radiator welded and formed by the cold-rolled steel plate to 210 +/-10 ℃ in a drying kiln, preserving the heat in the kiln for 15-20 min, and discharging gas generated by grease evaporation into a waste gas treatment device through an air exhaust device in the kiln;
2) shot blasting treatment: performing shot blasting treatment on the surface of the heat radiator after high-temperature evaporation, wherein the shot blasting material is steel shot with the diameter of 0.8-1 mm, and the surface scale produced by structure welding meets the surface rust removal grade Sa2.5, and generally continuously performing shot blasting and shot blasting on the surface: 80kg/m2～120kg/m2And the time reaches 25 s-50 s.
3. The surface coating process of the heat radiator for the transformer as claimed in claim 1, wherein the third step further comprises the following steps:
the electrophoresis adopts a cathode electrophoresis mode; tubular anodes vertically arranged are arranged on two sides of the electrophoretic paint groove, tubular anodes transversely arranged are arranged at the bottom of the electrophoretic paint groove, symmetrical tubular anodes transversely arranged are arranged at the upper part of the electrophoretic paint groove, a suspender channel for conveying workpieces is arranged in the middle of the symmetrical tubular anodes, and tubular anodes arranged in the electrophoretic paint groove are sequentially distributed along the direction of the groove body to form a long cage-shaped channel; the molded surface of the heat dissipation plate of the radiator is vertical to the horizontal direction, and the collecting pipes at the two ends are hung on the conveying line through hanging rods;
during electrophoresis, a radiator enters from one end of a long cage-shaped anode channel, the energizing voltage is gradually increased from 75V to 240V, and the immersion time is as follows: and (4) 120 s-180 s, and separating the radiator from the other end of the long cage-shaped anode channel to finish electrophoresis.
4. The surface coating process of the heat radiator for the transformer as claimed in claim 1, wherein the drying temperature of the heat radiator coating in the fourth step is 180 ℃ ± 10 ℃, and the drying time is 10min to 15 min.
5. The surface coating process of the heat radiator for the transformer as claimed in claim 1, wherein the fifth step further comprises the following steps:
the spraying adopts a mode of tribostatic resin powder spraying; the molded surface of the heat dissipation plate of the radiator is vertical to the horizontal direction, the collecting pipes at two ends are hung on a conveying line through a hanging rod, and the spraying device is provided with an upper powder spraying mechanism and a lower powder spraying mechanism; when spraying, the radiator passes through the powder spraying mechanism between the upper part and the lower part of the spraying device, and the powder spraying mechanism performs automatic directional powder spraying operation to the plate gap of the radiator;
the distance between a friction electrostatic powder spraying gun of the upper powder spraying mechanism and the workpiece is 100-200 mm, the powder supply pressure is 0.2-0.3 MPa, and the spraying pressure is 0.1-0.2 MPa;
the distance between the friction electrostatic powder spraying gun of the lower powder spraying mechanism and the workpiece is 100 mm-200 mm, the powder supply pressure is 0.2 MPa-0.4 MPa, and the spraying pressure is 0.1 MPa-0.3 MPa.
6. The surface coating process of the heat radiator for the transformer as claimed in claim 1, wherein the curing temperature of the heat radiator coating in the sixth step is 210 ℃ ± 10 ℃, and the curing time is 10min to 15 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111542014.2A CN114381781B (en) | 2021-12-16 | 2021-12-16 | Surface coating process for radiator for transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111542014.2A CN114381781B (en) | 2021-12-16 | 2021-12-16 | Surface coating process for radiator for transformer |
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| Publication Number | Publication Date |
|---|---|
| CN114381781A true CN114381781A (en) | 2022-04-22 |
| CN114381781B CN114381781B (en) | 2023-11-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111542014.2A Active CN114381781B (en) | 2021-12-16 | 2021-12-16 | Surface coating process for radiator for transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115029761A (en) * | 2022-07-06 | 2022-09-09 | 浙江道和机械股份有限公司 | Electrophoresis and plastic spraying integrated production line |
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| CN114381781B (en) | 2023-11-07 |
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