CN114405795A - Water-based paint spraying process for surface of die casting - Google Patents
Water-based paint spraying process for surface of die casting Download PDFInfo
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- CN114405795A CN114405795A CN202210062259.3A CN202210062259A CN114405795A CN 114405795 A CN114405795 A CN 114405795A CN 202210062259 A CN202210062259 A CN 202210062259A CN 114405795 A CN114405795 A CN 114405795A
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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
- B05D7/16—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 using synthetic lacquers or varnishes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
- B05D1/38—Successively applying liquids or other fluent materials, e.g. without intermediate treatment with intermediate treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/002—Pretreatement
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0209—Multistage baking
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
- B05D7/542—No clear coat specified the two layers being cured or baked together
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
- B05D7/544—No clear coat specified the first layer is let to dry at least partially before applying the second layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
- B05D7/546—No clear coat specified each layer being cured, at least partially, separately
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- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
A water-based paint spraying process for the surface of a die casting is characterized by comprising the following steps: cleaning a die-casting residual coating on the surface of a die casting in a high-speed jet flow mode by adopting shot blasting, improving the macroscopic flatness of the surface of the die casting, forming a layer of concave-convex microstructure on the surface of the die casting, increasing the specific surface area, and providing a paint embedded microstructure by bending and microcracking a micro-convex part of the concave-convex microstructure; secondly, removing oil stains on the die casting by using the alkaline liquid; step three, paint spraying preparation; step four, the paint spraying process is divided into: the primer spraying, the proofing and the finish spraying are carried out; step five, the baking finish flow dries the priming paint and the finishing paint of the die casting at stage temperature; step six, the detection process is divided into: paint color appearance detection, adhesion detection, hardness detection, paint film thickness detection, corrosion resistance detection, high temperature resistance detection, oil dependence detection and water dependence detection.
Description
Technical Field
The utility model relates to the field of paint spraying, in particular to a water-based paint spraying process for the surface of a die casting.
Background
Patent numbers: cn202120546189. x; the drying device for spraying the water-based paint comprises two groups of partition plates, a conveying mechanism arranged between the two groups of partition plates and a drying mechanism arranged on one side of the conveying mechanism; conveying mechanism is including setting up two sets of conveyer belt and fixed mounting in the middle of the baffle are two sets of the inside a plurality of groups of teeth of a cogwheel of conveyer belt, it is two sets of the conveyer belt is inside be provided with a plurality of groups the meshing of teeth of a cogwheel is connected with two sets of gears one, four groups a gear is inside all fixed to run through has a pivot one, four groups a pivot one end all with the baffle lateral wall rotates to be connected, two sets of the inside control mechanism who is used for controlling two sets of conveyer belt differential conveying that is provided with of conveyer belt. As a further improvement of the utility model: the control mechanism comprises two groups of rotating shafts II arranged between two groups of partition plates and two groups of motors I fixedly arranged on the inner walls of one group of partition plates, the two groups of rotating shafts II penetrate through the two groups of conveyor belts, one ends of the two groups of rotating shafts II are fixedly connected with the output ends of the corresponding motors respectively, and the other ends of the two groups of rotating shafts II are rotatably connected with the side walls of the partition plates; wherein a set of inside being provided with of conveyer belt corresponds two sets of gears two of a gear meshing, another group inside being provided with of conveyer belt and corresponding two sets of gears three of a gear meshing, two sets of gear two and two sets of gear three difference fixed cover is established at two sets of the two outsides of pivot, it is two sets of gear two and two sets of the number of teeth of gear three is 2: 1. as a further improvement of the utility model: two sets of the baffle is kept away from the equal fixed mounting in drying mechanism one side has the support. As a further improvement of the utility model: the drying mechanism comprises two groups of supporting plates fixedly arranged on one side of two groups of partition plates, the two groups of supporting plates are fixedly connected through a top plate, two groups of fixing plates are arranged on one side of the top plate facing two groups of conveyor belts, two motors are fixedly arranged on one sides of the two groups of conveyor belts facing two groups of fixing plates, two groups of drying machines are fixedly connected with output ends of the two motors, two groups of fixing plates are provided with two groups of rotating rods facing one side of the top plate, two groups of screw thread sections with opposite rotating directions are fixedly arranged on the outer sides of the two groups of rotating rods, lantern rings are respectively sleeved on the outer sides of the two groups of screw thread sections, one ends of the two groups of lantern rings are fixedly connected with the corresponding fixing plates, a sliding groove is formed in one side of the top plate facing the two groups of fixing plates, one ends of the two groups of lantern rings far away from the two groups of lantern rings are fixedly provided with sliding rods, one ends of the two groups of the sliding rods far away from the two groups of lantern rings extend into the sliding groove, the box body is arranged between the two groups of rotating rods and fixedly connected with the top plate through a connecting rod, and a rotating mechanism which is used for driving the two groups of rotating rods to mutually reverse and rotate repeatedly is arranged in the box body. As a still further improvement of the utility model: slewing mechanism is in including rotating the setting the inside third and fixed cover of pivot of box are established the gear in the three outsides of pivot is four, box inner wall fixed mounting has two sets of motors three, and is two sets of three output of motor all has incomplete gear, two sets of all through four fixed mounting of pivot incomplete gear can in proper order with four meshing of gear, it is two sets of the relative one end of bull stick all passes box and fixedly connected with bevel gear one, the fixed cover in the three outsides of pivot is equipped with bevel gear two, bevel gear two respectively with two sets of bevel gear meshing. As a still further improvement of the utility model: and the outer sides of the two groups of drying machines are respectively sleeved with a wind-gathering cover, and one end of each of the two groups of wind-gathering covers is fixedly connected with the corresponding fixing plate.
Because the surface of the die casting is smooth, the adhesion force of the water-based paint on the surface of the die casting is poor, and in order to improve the adhesion force of the water-based paint on the surface of the die casting and control the spraying quality of the water-based paint, the water-based paint spraying process on the surface of the die casting is urgently needed.
Disclosure of Invention
The utility model aims to improve the adhesive force of water-based paint on the surface of a die casting and control the spraying quality of the water-based paint, and provides a water-based paint spraying process for the surface of the die casting.
The technical solution for realizing the purpose of the utility model is as follows:
a water-based paint spraying process for the surface of a die casting is characterized by comprising the following steps: the method comprises the following steps:
cleaning a die-casting residual coating on the surface of a die casting in a high-speed jet flow mode by adopting shot blasting, improving the macroscopic flatness of the surface of the die casting, forming a layer of concave-convex microstructure on the surface of the die casting, increasing the specific surface area, and providing a microstructure embedded with water-based paint, wherein the micro-convex part of the concave-convex microstructure is bent and micro-cracked;
secondly, removing oil stains on the die casting by using the alkaline liquid;
step three, paint spraying preparation: debugging the spraying equipment and the paint mixing;
step four, the paint spraying process is divided into: the primer spraying, the proofing and the finish spraying are carried out;
step five, a paint baking process, wherein the primer and the finish paint of the die casting are dried at stage temperature;
step six, the detection process is divided into: the paint color appearance detection, the adhesion detection, the hardness detection, the paint film thickness detection, the corrosion resistance detection, the high temperature resistance detection, the oil-dependent property detection and the water-dependent property detection.
Compared with the prior art, the utility model has the following remarkable advantages: (1) forming a layer of concave-convex microstructure on the surface of the die casting to increase the specific surface area, wherein the micro-convex part of the concave-convex microstructure is provided with bending and micro-cracks, so that a microstructure embedded with water-based paint is provided, and the adhesive force of the water-based paint on the surface of the die casting is enhanced; (2) the alkaline liquid is adopted to remove oil stains on the die casting, so that the die casting is not damaged, and the adhesive force of the water-based paint on the surface of the die casting is enhanced; (3) and the baking paint process is used for drying the primer and the finish paint of the die casting at the stage temperature, so that the quality of the water-based paint formed on the surface of the die casting is improved.
The present invention is described in further detail below with reference to the attached drawing figures.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a process for applying an aqueous paint to a surface of a die cast part.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, a flow chart of a water-based paint spraying process for a die casting surface is shown.
The method comprises the following steps of (1) carrying out high-speed shot blasting on the surface 101 of a die casting, wherein the shot blasting is stainless steel shot blasting, the diameter of the stainless steel shot blasting is 0.2-0.3 MM, a residual die casting coating on the surface of the die casting is cleaned in a high-speed jet flow mode by adopting the stainless steel shot blasting, the macroscopic flatness of the surface of the die casting is improved, a concave-convex microstructure is formed on the surface of the die casting, the specific surface area is increased, and the micro-convex part of the concave-convex microstructure is provided with bending and microcracks, so that a microstructure embedded with water-based paint is provided, and the adhesive force of the paint is enhanced; an acute angle is formed between the high-speed jet flow of the stainless steel shot blasting and the surface of the die casting, different directions are changed, and the bending directions of the micro-convex parts of the concave-convex microstructure on the surface of the die casting are different, so that the adhesive force of the water-based paint is favorably improved.
The alkaline liquid removes oil stains 102 on the surface of the die casting, the alkaline liquid is a weak alkaline liquid and does not react with the surface of the die casting, and the alkaline liquid removes the oil stains on the surface of the die casting to enhance the adhesive force of the water-based paint on the surface of the die casting.
Carrying out paint mixing:
1. adding a diluent
When the paint temperature is 25-35 ℃, water is used as a common diluent, and the proportion of the added water is 60-100% of the paint volume; after adding the common diluent, when the paint temperature is lower than 25 ℃, adding the quick-drying diluent which accounts for 10-20% of the volume of the added common diluent; after adding the common diluent, when the paint temperature is higher than 35 ℃, the slow-drying diluent is added to be 10-20% of the volume of the added common diluent.
2. Viscosity adjustment
When the temperature of the paint is lower than 25 ℃, the viscosity of the paint is adjusted to 14-15; when the temperature of the paint is between 25 and 35 ℃, the viscosity of the paint is adjusted to be between 13 and 14; when the temperature of the paint is higher than 35 ℃, the viscosity of the paint is adjusted to 12-13.
The exhaust fan of the paint spray booth is started to remove oil and water in the paint gun.
The paint spraying process 104 comprises the following steps: the primer spraying, the proofing and the finish spraying.
And (3) primer spraying:
adjusting the parameters of the automatic water paint spraying equipment, wherein the spraying pressure is 0.4-0.6 MP; the distance between the spray gun and the die casting is 15-25 cm; the spraying is uniform, the standing time is more than or equal to 10min, the primer is naturally dried on the surface, and a micro-thin paint film is formed on the surface.
The proofing:
sampling the first die casting, and adjusting automatic spraying parameters of equipment according to a sampling result; the die casting is visually observed by using a color matching plate without obvious color difference; and (3) detecting by using a color difference meter, wherein the parameters of the color difference meter are as follows: delta E is less than or equal to 1, Delta L is less than or equal to 1, and Delta a and Delta b are less than or equal to 0.5.
And (3) spraying finish paint:
adjusting the parameters of the automatic water paint spraying equipment, wherein the spraying pressure is 0.4-0.6 MP; spraying finish paint by a spray gun at a distance of 15-25 cm from the die casting; and others are adjusted according to the sample result.
And a paint baking process 105, wherein the paint baking process is used for baking the primer and the finish of the die casting at stage temperatures. The baking finish is divided into two stages, wherein the first stage is to dry the primer, namely after the primer is baked, the moisture in the primer is dried, the temperature is controlled to be 80 +/-3 ℃, the second stage is to bake the primer and the finish, the temperature is controlled to be 175 +/-5 ℃, and the purpose is to harden the surface paint; in the paint baking process, a uniformly heated mode is adopted, and because the natural gas oven is fast in temperature rise, a staged temperature rise mode is adopted, so that the temperature difference range in the temperature rise process is reduced; in the temperature rising process, a rapid temperature rising mode is adopted, the temperature difference range in the temperature rising process is enlarged, and if the surface of a die casting is heated unevenly, the problems of blackened colored paint, flowered paint, foaming and the like can occur.
The detection process 106 includes: the paint color appearance detection, the adhesion detection, the hardness detection, the paint film thickness detection, the corrosion resistance detection, the high temperature resistance detection, the oil-dependent property detection and the water-dependent property detection.
1. Paint color appearance detection
Visual inspection: overlapping 1/4 the color plate and the die casting to be inspected, wherein the distance is 300mm, the angle between the eye light and the die casting is 120 degrees, and the comparison is carried out in all directions of natural light; no obvious color difference is observed visually; has no obvious defects of exposed bottom, particles, flow marks, orange peel, pockmarks, bruises and the like. And detecting the paint on the surface of the die casting by a color difference meter, wherein the parameters of the color difference meter are that delta E is less than or equal to 1, delta L is less than or equal to 1, delta a and delta b are less than or equal to 0.5, the paint on the surface of the die casting is qualified, and otherwise, the paint on the surface of the die casting is unqualified.
2. Adhesion detection
Scribing 9 squares with the square of 5mmX5mm on the surface of the die casting, and tearing paint on the surface of the die casting by using colorless transparent adhesive; visual inspection: the paint on the surface of the die casting does not fall off or slightly falls off, the cross area of the fallen paint cannot be obviously larger than 1/20 of the square area, the paint on the surface of the die casting is qualified, otherwise, the paint on the surface of the die casting is unqualified.
3. Hardness testing
Drawing a 2H pencil by using a Chinese brand with a 45-degree angle of a pencil point, wherein the pencil requires that the diameter d of a pencil lead is more than or equal to 1.8mm, the length is about 3mm, and the pencil point is round; and (3) at the uniform speed of 3mm/s, forcefully scratching paint on the surface of the die casting for 5 times at the same position, wiping pencil marks by using a flannelette, observing, wherein the paint on the surface of the die casting has no obvious scratch, the paint on the surface of the die casting is qualified, and otherwise, the paint on the surface of the die casting is unqualified.
4. Paint film thickness detection
And detecting the surface of the die casting by using a thickness gauge, wherein the thickness of paint on the surface of the die casting is 25-55 mu m.
5. Corrosion resistance testing
Forming an angle of 15-25 degrees between the die casting and the bottom of a neutral salt spray box, placing the die casting in the neutral salt spray box at the temperature of 35 +/-2 ℃ for constant temperature, and performing a corrosion resistance test for 72 hours, wherein the paint on the surface of the die casting does not bubble or rust; the corrosion resistance is more than or equal to grade 5 (GB 6461-89).
6. High temperature resistance detection
The die casting was heated to 200 ℃ and held for 3 minutes. Drawing a 2H pencil by using a Chinese brand with a 45-degree angle formed by a pencil point, wherein the pencil requires that the diameter d of a pencil lead is more than or equal to 1.8mm, the length is about 2mm, and the pencil point is round; at the uniform speed of 3mm/s, the die casting is subjected to forced scratching on the same position of paint on the surface of the die casting for 5 times, and pencil marks are wiped off by using lint for observation; after the heat preservation is carried out for 2 hours in the environment of 200 ℃, the paint on the surface of the die casting has no obvious scratch and no obvious color change, the paint on the surface of the die casting is qualified, otherwise, the paint on the surface of the die casting is unqualified.
7. Oil dependence detection
And (3) placing the die casting in gasoline, soaking for two hours, tearing the paint on the surface of the die casting by using a transparent adhesive tape, wherein the paint does not fall off, the paint on the surface of the die casting is qualified, and otherwise, the paint on the surface of the die casting is unqualified.
8. Aqueous based assay
And soaking the die casting in constant-temperature water with the temperature of 40 +/-1 ℃, taking out after 72 hours, standing indoors for 2 hours, and checking. The paint on the surface of the die casting is not softened, has no gloss reduction, has no color change and the like, the paint on the surface of the die casting is qualified, otherwise, the paint on the surface of the die casting is unqualified
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 utility model, 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 (10)
1. A water-based paint spraying process for the surface of a die casting is characterized by comprising the following steps: the method comprises the following steps:
cleaning a die-casting residual coating on the surface of a die casting in a high-speed jet flow mode by adopting shot blasting, improving the macroscopic flatness of the surface of the die casting, forming a layer of concave-convex microstructure on the surface of the die casting, increasing the specific surface area, and providing a microstructure embedded with water-based paint, wherein the micro-convex part of the concave-convex microstructure is bent and micro-cracked;
secondly, removing oil stains on the die casting by using the alkaline liquid;
step three, paint spraying preparation: debugging the spraying equipment and the paint mixing;
step four, the paint spraying process is divided into: the primer spraying, the proofing and the finish spraying are carried out;
step five, a paint baking process, wherein the primer and the finish paint of the die casting are dried at stage temperature;
step six, the detection process is divided into: the paint color appearance detection, the adhesion detection, the hardness detection, the paint film thickness detection, the corrosion resistance detection, the high temperature resistance detection, the oil-dependent property detection and the water-dependent property detection.
2. The process for spraying the water-based paint on the surface of the die casting as claimed in claim 1, wherein the shot blasting is stainless steel shot blasting, and the diameter of the stainless steel shot blasting is 0.2 MM-0.3 MM.
3. The water-based paint spraying process for the surface of the die casting as claimed in claim 1, wherein an acute angle is formed between the high-speed jet of the stainless steel shot blasting and the surface of the die casting, different directions are changed, and the bending directions of the micro-convex parts of the concave-convex microstructure on the surface of the die casting are different, so that the adhesion force of the water-based paint is favorably improved.
4. The process for spraying the water-based paint on the surface of the die casting as claimed in claim 1, wherein the alkaline liquid is a weakly alkaline liquid and does not react with the surface of the die casting chemically.
5. The process for spraying the water-based paint on the surface of the die casting as claimed in claim 1, wherein a closed paint spraying room is provided, an automatic rotating device is adopted, the automatic rotating device is provided with a clamp, the die casting is placed on the clamp, and the water-based paint automatic spraying equipment is arranged.
6. The process for spraying the water-based paint on the surface of the die casting as claimed in claim 1, wherein when the paint temperature is 25-35 ℃, water is used as a common diluent, and the proportion of the added water is 60-100% of the volume of the paint; after adding the common diluent, when the paint temperature is lower than 25 ℃, adding the quick-drying diluent which accounts for 10-20% of the volume of the added common diluent; after adding the common diluent, when the paint temperature is higher than 35 ℃, the slow-drying diluent is added to be 10-20% of the volume of the added common diluent.
7. The process for spraying the water-based paint on the surface of the die casting as claimed in claim 1, wherein when the temperature of the paint is less than 25 ℃, the viscosity of the paint is adjusted to 14-15; when the temperature of the paint is between 25 and 35 ℃, the viscosity of the paint is adjusted to be between 13 and 14; when the temperature of the paint is higher than 35 ℃, the viscosity of the paint is adjusted to 12-13.
8. The water-based paint spraying process for the surface of the die casting as claimed in claim 1, wherein the primer spraying: adjusting the parameters of the automatic water paint spraying equipment, wherein the spraying pressure is 0.4-0.6 MP; the distance between the spray gun and the die casting is 15-25 cm; the spraying is uniform, the standing time is more than or equal to 10min, the primer is naturally dried on the surface, and a micro-thin paint film is formed on the surface.
9. The water-based paint spraying process for the surface of the die casting as claimed in claim 1, wherein the spray finishing paint comprises the following steps: adjusting the parameters of the automatic water paint spraying equipment, wherein the spraying pressure is 0.4-0.6 MP; and spraying finish paint by a spray gun at a distance of 15-25 cm from the die casting.
10. The process of claim 1 for the aqueous paint spraying of die casting surfaces, characterized by: the baking finish is divided into two stages, wherein the first stage is to dry the primer, namely after the primer is baked, the moisture in the primer is dried, the temperature is controlled to be 80 +/-3 ℃, the second stage is to bake the primer and the finish, the temperature is controlled to be 175 +/-5 ℃, and the purpose is to harden the surface paint; in the paint baking process, a uniformly heating mode is adopted, and because the natural gas oven is fast in temperature rise, a staged temperature rise mode is adopted, so that the temperature difference range in the temperature rise process is reduced.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210062259.3A CN114405795A (en) | 2022-01-19 | 2022-01-19 | Water-based paint spraying process for surface of die casting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210062259.3A CN114405795A (en) | 2022-01-19 | 2022-01-19 | Water-based paint spraying process for surface of die casting |
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| CN114405795A true CN114405795A (en) | 2022-04-29 |
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| CN202210062259.3A Pending CN114405795A (en) | 2022-01-19 | 2022-01-19 | Water-based paint spraying process for surface of die casting |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116117435A (en) * | 2022-09-30 | 2023-05-16 | 江苏先锋精密科技股份有限公司 | Processing method of power interface panel |
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| CN116117435B (en) * | 2022-09-30 | 2023-11-21 | 江苏先锋精密科技股份有限公司 | Processing method of power interface panel |
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