CN111151425A - Surface treatment method for combination of upper and lower grilles of automobile - Google Patents
Surface treatment method for combination of upper and lower grilles of automobile Download PDFInfo
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- CN111151425A CN111151425A CN201911402147.2A CN201911402147A CN111151425A CN 111151425 A CN111151425 A CN 111151425A CN 201911402147 A CN201911402147 A CN 201911402147A CN 111151425 A CN111151425 A CN 111151425A
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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
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
- B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
- B05B13/0221—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work characterised by the means for moving or conveying the objects or other work, e.g. conveyor belts
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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
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
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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
- B05D1/30—Processes for applying liquids or other fluent materials performed by gravity only, i.e. flow coating
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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
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B6/00—Cleaning by electrostatic means
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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
Abstract
The invention relates to a combined surface treatment method for upper and lower grilles of an automobile, which comprises the following steps: step 1: pre-treating; step 2: selecting a spraying jig; and step 3: loading the workpiece; and 4, step 4: spraying; and 5: and (6) baking. The invention has the advantages that: according to the invention, when the upper and lower grilles of the automobile are arranged on the grille supporting component, the upper and lower grilles can be obliquely staggered, so that the upper and lower grilles of two groups of automobiles can be sprayed simultaneously, and the production efficiency can be effectively improved; simultaneously, can make the spray gun spraying that the slope set up in spraying tool top to all surfaces of grid on the car, guarantee to evenly spray paint the car grid to through controlling strict spraying process parameter, improve the paint spraying quality of product.
Description
Technical Field
The invention belongs to the field of automobile part processing, and particularly relates to a surface treatment method for an automobile upper and lower grating combination.
Background
The automobile front wall air inlet grille is widely applied to automobiles, is mainly installed at the head of an automobile and used for heat dissipation and air exchange of an automobile engine, and is generally the same as the head of the automobile in shape and has a certain radian.
The existing manufacturing process of the front wall air-inlet grille of the automobile generally divides the front air-inlet grille of the automobile into two parts for manufacturing, and one part is plated with hard chrome after being molded to form the visual effect of a mirror surface; spraying paint on the other part after molding to form a deep black paint part; and finally, fixing the black paint piece on the mirror surface layer plated with hard chromium to finish the manufacture of the air grille before the automobile. When the automobile front wall air inlet grille part is sprayed, the automobile grille is supported on a working table surface through a spraying device for spraying.
As shown in fig. 1 and 2, the conventional spraying device comprises rectangular frame bases 11, wherein upper support cross bars 12, connecting bars 13 and lower support cross bars 14 are sequentially arranged between the rectangular frame bases 11 from top to bottom, and two groups of support devices 15 are arranged on the upper support cross bars 12 and the lower support cross bars 14; two parallel positioning support rods 16 perpendicular to the support cross rods are further arranged on the upper surface of the rectangular frame base 11, each positioning support rod 16 penetrates through the support device 15, and the end parts of the positioning support rods 16 are arranged outside the rectangular frame base 11; however, the spraying device has certain defects in the spraying process: because the automobile grille has a certain radian, most of the automobile grille is positioned on the upper surface of the supporting device, and a small part of the automobile grille is positioned on the side edge of the supporting device, the automobile grille cannot be sprayed to the automobile grille positioned on the side edge of the supporting device due to the fact that the spray gun arranged above the spraying device is inclined, the automobile grille cannot be uniformly sprayed, and the orange peel phenomenon can occur, so that the paint spraying quality of a product is influenced; in addition, the spraying device can only be used for placing two automobile upper grids or two automobile lower grids for simultaneous spraying, so that the production efficiency is low.
Therefore, it is very necessary to develop a surface treatment method for combining the upper and lower grilles of the automobile, which can effectively improve the production efficiency, can uniformly spray paint on the grilles of the automobile and further improve the paint spraying quality of products.
Disclosure of Invention
The invention aims to provide a surface treatment method for the combination of an upper grating and a lower grating of an automobile, which can effectively improve the production efficiency, can uniformly spray paint on the grating of the automobile and further improves the paint spraying quality of products.
In order to solve the technical problems, the technical scheme of the invention is as follows: the combined surface treatment method for the upper and lower grilles of the automobile has the innovation points that: the method comprises the following steps:
step 1: pretreatment: checking whether the appearance of the upper and lower grids of the automobile is broken by the clamping pin, and performing dust removal treatment on the upper and lower grids of the automobile which are qualified;
step 2: selecting a spraying jig: the spraying jig comprises rectangular frame bases, an upper supporting cross rod and a lower supporting cross rod are sequentially arranged between the rectangular frame bases from top to bottom, and one ends of the upper supporting cross rod and the lower supporting cross rod extend out of the rectangular frame bases; the upper surface of the left frame of the rectangular frame base is provided with a positioning support rod with two ends extending out of the rectangular frame base, and the middle parts of the opposite side surfaces of the upper support cross rod and the lower support cross rod are fixedly connected with a connecting support rod;
a first upper automobile upper grid supporting component is arranged on the upper surfaces of the positioning supporting rod and the upper supporting cross rod, and a first lower automobile upper grid supporting component is arranged on the upper surfaces of the positioning supporting rod and the lower supporting cross rod; an upper automobile lower grid supporting component is arranged on the upper surface of the connecting supporting rod on the opposite side of the upper supporting cross rod, and a lower automobile lower grid supporting component is arranged on the upper surface of the connecting supporting rod on the opposite side of the lower supporting cross rod; a second upper automobile upper grid supporting assembly is arranged on the upper surface of the upper supporting cross rod at the right end part, and a second lower automobile upper grid supporting assembly is arranged on the upper surface of the lower supporting cross rod at the right end part;
the first upper automobile upper grid supporting component and the first lower automobile upper grid supporting component are the same in structure, and the first upper automobile upper grid supporting component and the first lower automobile upper grid supporting component are arranged correspondingly; the first upper automobile upper grid support assembly comprises a right-angle trapezoidal support frame vertically arranged on the upper surface of the upper support cross rod, and the right-angle side of the right-angle trapezoidal support frame is positioned on the positioning support cross rod; the upper end surface of the right trapezoid supporting frame is sequentially provided with a first positioning column, a second positioning column and a third positioning column from left to right; the first positioning column and the second positioning column are arranged close to each other, the heights of the first positioning column and the second positioning column are the same, and the height of the third positioning column is lower than that of the second positioning column;
the upper automobile lower grid supporting component and the lower automobile lower grid supporting component have the same structure, and the upper automobile lower grid supporting component and the lower automobile lower grid supporting component are arranged correspondingly; the upper automobile lower grille supporting component comprises two rectangular supporting frames vertically arranged on the upper surface of the upper supporting cross rod, a fourth positioning column, a fifth positioning column and a sixth positioning column which are the same in height are sequentially arranged on the upper end surface of each rectangular supporting frame from left to right, and the fourth positioning column and the fifth positioning column are arranged in a close manner;
the second upper automobile upper grid supporting assembly and the second lower automobile upper grid supporting assembly are the same in structure, and the second upper automobile upper grid supporting assembly and the second lower automobile upper grid supporting assembly are arranged correspondingly; the second upper automobile upper grid support assembly comprises a strip-shaped support frame vertically arranged on the upper surface of the upper support cross rod, and a seventh positioning column, an eighth positioning column and a ninth positioning column are sequentially arranged on the upper end surface of the strip-shaped support frame from left to right; the seventh positioning column and the eighth positioning column are arranged close to each other, the heights of the seventh positioning column and the eighth positioning column are the same, and the height of the ninth positioning column is lower than that of the eighth positioning column;
the heights of the right trapezoid supporting frame, the rectangular supporting frame and the strip-shaped supporting frame are gradually reduced, the height of the fourth positioning column is lower than that of the third positioning column, and the height of the seventh positioning column is lower than that of the fourth positioning column; the end part of the positioning support rod is also provided with a positioning support plate vertical to the positioning support rod, and the height of the positioning support plate is the same as that of the first positioning column;
the upper surface of the rectangular frame base corresponding to the strip-shaped support frame is also provided with an auxiliary positioning support rod, two ends of the auxiliary positioning support rod extend out of the rectangular frame base, and the auxiliary positioning support rod is arranged close to the seventh positioning column; the end part of the positioning auxiliary supporting rod is also provided with a positioning auxiliary supporting plate vertical to the positioning auxiliary supporting rod, and the height of the positioning auxiliary supporting plate is the same as that of the seventh positioning column;
and step 3: loading: sequentially placing the upper and lower grids of the pre-treated automobile on the spraying jig selected in the step 2 in sequence to avoid direct contact with a spraying area, placing 2 upper grids and 2 lower grids on each spraying jig, enabling the products to have consistent directions and flowing into a dry ice dust removal process at a speed of 1-2 min/skid along with the skid; the automobile upper grille is supported by the upper and lower automobile upper grille supporting components, so that an included angle of 60 degrees is formed between one side surface of the automobile upper grille and the rectangular frame base of the spraying jig, and an included angle of 30 degrees is formed between the other side surface of the automobile upper grille and the rectangular frame base of the spraying jig;
and 4, step 4: spraying: spraying a primer, keeping the distance between a spray gun and the upper and lower grids of the automobile within 15cm, controlling the film thickness to be between 10 and 20 microns, leveling the upper and lower grids of the automobile at 22 to 28 ℃ after spraying is finished, spraying a finish after leveling for 5 to 10min, and controlling the film thickness to be between 25 and 40 microns;
and 5: baking: and after the spraying is finished, sending the mixture to a baking oven with the temperature of 75-85 ℃ for baking for 30-40 min, then taking out the mixture, and standing for 20-24 h.
Further, the dust removal treatment in the step 1 is specifically to remove dust on the back and the front of the upper and lower grids of the automobile once by using an air gun, wipe the paint spraying area of the upper and lower grids of the automobile by using dust-free cloth dipped with isopropanol, and remove dust once after wiping, wherein the distance between the electrostatic dust removal air gun and the upper and lower grids of the automobile is 5-15 cm.
Further, the spraying conditions in the step 4 are as follows: air pressure is 2.5-4.5 kg/cm2The temperature is 22-28 ℃, and the humidity is 50-70%.
The invention has the advantages that:
according to the automobile upper and lower grid combined surface treatment method, the spraying jig in the form of combining the automobile upper grid supporting assembly with the automobile lower grid supporting assembly is selected, so that the automobile upper and lower grids can be obliquely and staggeredly arranged when being placed on the grid supporting assembly, and further the two groups of automobile upper and lower grids can be sprayed simultaneously, and the production efficiency can be effectively improved; in addition, grid supporting component supports on the car through upper and lower car, be 60 contained angles between the rectangular frame base that makes grid one side and spraying tool on the car, be 30 contained angles between the rectangular frame base that grid another side and spraying tool on the car, can make the slope set up in the spray gun spraying of spraying tool top to all surfaces of grid on the car, guarantee to evenly spray paint the car grid, and through the strict spraying process parameter of control, avoid taking place the orange peel phenomenon, improve the quality of spraying paint of product.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a front view of a related art spray coating device.
Fig. 2 is a plan view of a related art spray coating device.
FIG. 3 is a front view of the spraying jig used in the surface treatment method for combining the upper and lower grilles of the automobile.
FIG. 4 is a front view of the spraying jig used in the surface treatment method for combining the upper and lower grilles of the automobile.
Detailed Description
The following examples are presented to enable one of ordinary skill in the art to more fully understand the present invention and are not intended to limit the scope of the embodiments described herein.
Examples
The method for processing the combined surface of the upper grating and the lower grating of the automobile comprises the following steps:
step 1: pretreatment: whether clamping feet are broken on the appearances of the upper and lower grids of the automobile are checked, and dust removal treatment is carried out on the upper and lower grids qualified by the checking, wherein the dust removal treatment specifically comprises the steps of firstly removing dust on the back surfaces and the front surfaces of the upper and lower grids of the automobile by using an air gun, then wiping the paint spraying areas of the upper and lower grids of the automobile by using dust-free cloth and dipping the dust in isopropanol, and then removing dust once after wiping is finished, wherein the distance between an electrostatic dust removal air gun and the upper and lower grids of the automobile is 5-15 cm, and in the step, as an embodiment, the distance between the electrostatic dust removal air gun and the upper and lower grids.
Step 2: choose for use the spraying tool, as shown in fig. 3 and 4, including rectangular frame base 1, top-down has arranged in proper order between rectangular frame base 1 and has supported horizontal pole 2 and lower support horizontal pole 3, and the one end of going up support horizontal pole and 2 lower support horizontal poles 3 all stretches out rectangular frame base 1 and sets up.
The upper surface of the left frame of the rectangular frame base 1 is welded with a positioning support rod 4 with two ends extending out of the rectangular frame base 1, and the middle parts of the opposite sides of the upper support cross rod 2 and the lower support cross rod 3 are welded with a connecting support rod 5.
A first upper automobile upper grid supporting component 61 is arranged on the surfaces of the positioning support rod 4 and the upper support cross rod 2, and a first lower automobile upper grid supporting component 62 is arranged on the surfaces of the positioning support rod 4 and the lower support cross rod 3; an upper automobile lower grille supporting component 71 is arranged on the upper surface of the connecting supporting rod 5 on the opposite side of the upper supporting cross rod 2, and a lower automobile lower grille supporting component 72 is arranged on the upper surface of the connecting supporting rod 5 on the opposite side of the lower supporting cross rod 3; a second upper vehicle grill support member 81 is provided on the upper surface of the upper support rail 2 at the right end portion, and a second lower vehicle grill support member 83 is provided on the upper surface of the lower support rail 3 at the right end portion.
In the embodiment, the first upper vehicle grille support assembly 61 and the first lower vehicle grille support assembly 62 have the same structure, and the first upper vehicle grille support assembly 61 and the first lower vehicle grille support assembly 62 are correspondingly arranged; taking the first upper vehicle grille support assembly 61 as an example, the structure thereof will be described in detail: first go up grid supporting component 61 on car including set up perpendicularly in the right trapezoid support frame that supports the 2 upper surfaces of horizontal pole, and the right angle limit of right trapezoid support frame is located the location and supports horizontal pole 4, in the embodiment, the right trapezoid support frame includes right trapezoid frame 611, and the both sides limit of right trapezoid frame 611, connect fixedly between the higher authority and the location bracing piece 4 through integrated into one piece's triangle-shaped backup pad 612, still connect fixedly between higher authority in right trapezoid frame 611 and last support horizontal pole 2 through isosceles triangle-shaped backup pad 613.
A first positioning column 614, a second positioning column 615 and a third positioning column 616 are sequentially arranged on the upper end surface of the right trapezoid supporting frame from left to right; the first positioning column 614 and the second positioning column 615 are respectively connected and fixed with the upper end surface of the right trapezoid frame 611 through a triangular supporting plate 612 which is integrally formed with the right trapezoid supporting frame, and the third positioning column 616 is integrally formed with the upper end surface of the right trapezoid frame 611 and is vertically arranged; the triangular support plate 612 supporting the first positioning column 614 and the triangular support plate 612 integrally formed at the right angle side of the right trapezoid support frame are symmetrically arranged, so that the stability is ensured, and meanwhile, a certain attractive degree is ensured; the first positioning post 614 and the second positioning post 615 are disposed close to each other, and the heights of the first positioning post 614 and the second positioning post 615 are the same, and the height of the third positioning post 616 is lower than the second positioning post 615.
Correspondingly, the upper automobile lower grille supporting component 71 and the lower automobile lower grille supporting component 72 have the same structure, and the upper automobile lower grille supporting component 71 and the lower automobile lower grille supporting component 72 are correspondingly arranged; the structure of the lower grill support assembly 71 of the vehicle is explained in detail by taking the example as follows: go up car lower grid supporting component 71 including setting up perpendicularly in two rectangle support frames of last support horizontal pole upper surface, the rectangle support frame includes rectangle frame 711, connect fixedly through right triangle backup pad 712 between the outside limit of rectangle frame 711, the higher authority and the last support horizontal pole 2, each rectangle support frame up end has set gradually highly the same fourth reference column 713, fifth reference column 714 and sixth reference column 715 from left right side, and fourth reference column 713 is close to the setting with fifth reference column 715.
In the embodiment, the second upper vehicle grille support member 81 and the second lower vehicle grille support member 82 have the same structure, and the second upper vehicle grille support member 81 and the second lower vehicle grille support member 82 are correspondingly arranged; taking the second upper vehicle grille support assembly 81 as an example, the structure thereof will be described in detail: the second upper automobile upper grille support component 81 comprises a strip-shaped support frame 811 vertically arranged on the upper surface of the upper support cross rod 2, and a seventh positioning column 812, an eighth positioning column 813 and a ninth positioning column 814 are sequentially arranged on the upper end surface of the strip-shaped support frame 811 from left to right; the seventh positioning column 812 and the eighth positioning column 813 are respectively fixed on the upper end surface of the strip supporting frame 811 through a triangular supporting plate 815 integrally formed with the strip supporting frame 811, the seventh positioning column 812 and the eighth positioning column 813 are disposed close to each other, the seventh positioning column 812 and the eighth positioning column 813 have the same height, and the ninth positioning column 814 is lower than the eighth positioning column 813.
As examples, more specific embodiments are: the heights of the right-angled trapezoid supporting frame, the rectangular supporting frame and the strip-shaped supporting frame 811 are gradually reduced, the height of the fourth positioning column 713 is lower than that of the third positioning column 616, and the height of the seventh positioning column 812 is lower than that of the fourth positioning column 713; the end of the positioning support rod 4 is further provided with a positioning support plate perpendicular to the positioning support rod 4, and the height of the positioning support plate is the same as that of the first positioning column 614.
The upper surface of the rectangular frame base 1 corresponding to the strip-shaped support frame 811 is further provided with a positioning auxiliary support rod 9, two ends of which extend out of the rectangular frame base 1, and the positioning auxiliary support rod 9 is arranged close to the seventh positioning column 812; a positioning auxiliary supporting plate perpendicular to the positioning auxiliary supporting rod 9 is further disposed at an end of the positioning auxiliary supporting rod 9, and the height of the positioning auxiliary supporting plate is the same as that of the seventh positioning column 812.
And step 3: loading: sequentially placing the upper and lower grids of the pre-treated automobile on the spraying jig selected in the step 2 in sequence to avoid direct contact with a spraying area, placing 2 upper and 2 lower grid products on each spraying jig, enabling the products to have consistent directions and flow into a dry ice dust removal process at a speed of 1-2 min/skid along with the skid, and starting an ice dryer to remove dust on the upper and lower grids of the automobile, wherein in the step, the products flow into the dry ice dust removal process at a speed of 2 min/skid along with the skid; the automobile upper grille is supported by the upper and lower automobile upper grille supporting components, so that an included angle of 60 degrees is formed between one side surface of the automobile upper grille and the rectangular frame base of the spraying jig, and an included angle of 30 degrees is formed between the other side surface of the automobile upper grille and the rectangular frame base of the spraying jig.
And 4, step 4: spraying: the spraying conditions are as follows: air pressure is 2.5-4.5 kg/cm2At a temperature of 22-28 ℃, and wetThe degree is 50% -70%, the primer is sprayed, the distance between a spray gun and the upper and lower grids of the automobile is kept within 15cm, the film thickness is controlled to be 10-20 um, after the spraying is finished, the upper and lower grids of the automobile are leveled at 22-28 ℃, the finish paint is sprayed after 5-10 min of leveling, and the film thickness is controlled to be 25-40 um; specifically, the spraying conditions were: air pressure 3.5kg/cm2Spraying a primer at the temperature of 25 ℃ and the humidity of 60%, keeping the distance between a spray gun and the upper and lower grids of the automobile within 15cm, controlling the film thickness to be 15um, leveling the upper and lower grids of the automobile at the temperature of 25 ℃ after spraying is finished, and spraying finish paint after leveling for 8min, wherein the film thickness is controlled to be 32 um; wherein the primer is formed by mixing a WLF126048 primer main agent, a WLF60738 curing agent and a WLFV8 diluent in a weight ratio of 100:15:50, and the finish paint is formed by mixing a WLF126049 finish paint main agent, a WLFH22 curing agent and a WLF101343(CN) diluent in a weight ratio of 100:50: 50;
and 5: baking: after the spraying is finished, the mixture is sent to a baking oven with the temperature of 75-85 ℃ for baking for 30-40 min, then taken out and kept stand for 20-24 h; in the step, after the spraying is finished, the mixture is sent to an oven with the temperature of 80 ℃ for baking for 35min, and then is taken out and kept stand for 24 h.
The automobile upper grille subjected to the surface treatment of the embodiment is subjected to orange peel detection: a laser orange peel tester (Garden-4806) of BYK company is adopted for testing, 60-degree laser is used as a point light source to irradiate the tested surface, 1250 times of laser is emitted within a distance of 10cm by slow and uniform pushing to illuminate the tested surface, the number of 1250 times is read, the distance between every two readings is 0.08mm, 35 wide lines with the width of 0.1mm can be seen within the distance of 0.08mm, and orange peel is not obvious.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. A surface treatment method for the combination of an upper grating and a lower grating of an automobile is characterized in that: the method comprises the following steps:
step 1: pretreatment: checking whether the appearance of the upper and lower grids of the automobile is broken by the clamping pin, and performing dust removal treatment on the upper and lower grids of the automobile which are qualified;
step 2: selecting a spraying jig: the spraying jig comprises rectangular frame bases, an upper supporting cross rod and a lower supporting cross rod are sequentially arranged between the rectangular frame bases from top to bottom, and one ends of the upper supporting cross rod and the lower supporting cross rod extend out of the rectangular frame bases; the upper surface of the left frame of the rectangular frame base is provided with a positioning support rod with two ends extending out of the rectangular frame base, and the middle parts of the opposite side surfaces of the upper support cross rod and the lower support cross rod are fixedly connected with a connecting support rod;
a first upper automobile upper grid supporting component is arranged on the upper surfaces of the positioning supporting rod and the upper supporting cross rod, and a first lower automobile upper grid supporting component is arranged on the upper surfaces of the positioning supporting rod and the lower supporting cross rod; an upper automobile lower grid supporting component is arranged on the upper surface of the connecting supporting rod on the opposite side of the upper supporting cross rod, and a lower automobile lower grid supporting component is arranged on the upper surface of the connecting supporting rod on the opposite side of the lower supporting cross rod; a second upper automobile upper grid supporting assembly is arranged on the upper surface of the upper supporting cross rod at the right end part, and a second lower automobile upper grid supporting assembly is arranged on the upper surface of the lower supporting cross rod at the right end part;
the first upper automobile upper grid supporting component and the first lower automobile upper grid supporting component are the same in structure, and the first upper automobile upper grid supporting component and the first lower automobile upper grid supporting component are arranged correspondingly; the first upper automobile upper grid support assembly comprises a right-angle trapezoidal support frame vertically arranged on the upper surface of the upper support cross rod, and the right-angle side of the right-angle trapezoidal support frame is positioned on the positioning support cross rod; the upper end surface of the right trapezoid supporting frame is sequentially provided with a first positioning column, a second positioning column and a third positioning column from left to right; the first positioning column and the second positioning column are arranged close to each other, the heights of the first positioning column and the second positioning column are the same, and the height of the third positioning column is lower than that of the second positioning column;
the upper automobile lower grid supporting component and the lower automobile lower grid supporting component have the same structure, and the upper automobile lower grid supporting component and the lower automobile lower grid supporting component are arranged correspondingly; the upper automobile lower grille supporting component comprises two rectangular supporting frames vertically arranged on the upper surface of the upper supporting cross rod, a fourth positioning column, a fifth positioning column and a sixth positioning column which are the same in height are sequentially arranged on the upper end surface of each rectangular supporting frame from left to right, and the fourth positioning column and the fifth positioning column are arranged in a close manner;
the second upper automobile upper grid supporting assembly and the second lower automobile upper grid supporting assembly are the same in structure, and the second upper automobile upper grid supporting assembly and the second lower automobile upper grid supporting assembly are arranged correspondingly; the second upper automobile upper grid support assembly comprises a strip-shaped support frame vertically arranged on the upper surface of the upper support cross rod, and a seventh positioning column, an eighth positioning column and a ninth positioning column are sequentially arranged on the upper end surface of the strip-shaped support frame from left to right; the seventh positioning column and the eighth positioning column are arranged close to each other, the heights of the seventh positioning column and the eighth positioning column are the same, and the height of the ninth positioning column is lower than that of the eighth positioning column;
the heights of the right trapezoid supporting frame, the rectangular supporting frame and the strip-shaped supporting frame are gradually reduced, the height of the fourth positioning column is lower than that of the third positioning column, and the height of the seventh positioning column is lower than that of the fourth positioning column; the end part of the positioning support rod is also provided with a positioning support plate vertical to the positioning support rod, and the height of the positioning support plate is the same as that of the first positioning column;
the upper surface of the rectangular frame base corresponding to the strip-shaped support frame is also provided with an auxiliary positioning support rod, two ends of the auxiliary positioning support rod extend out of the rectangular frame base, and the auxiliary positioning support rod is arranged close to the seventh positioning column; the end part of the positioning auxiliary supporting rod is also provided with a positioning auxiliary supporting plate vertical to the positioning auxiliary supporting rod, and the height of the positioning auxiliary supporting plate is the same as that of the seventh positioning column;
and step 3: loading: sequentially placing the upper and lower grids of the pre-treated automobile on the spraying jig selected in the step 2 in sequence to avoid direct contact with a spraying area, placing 2 upper grids and 2 lower grids on each spraying jig, enabling the products to have consistent directions and flowing into a dry ice dust removal process at a speed of 1-2 min/skid along with the skid; the automobile upper grille is supported by the upper and lower automobile upper grille supporting components, so that an included angle of 60 degrees is formed between one side surface of the automobile upper grille and the rectangular frame base of the spraying jig, and an included angle of 30 degrees is formed between the other side surface of the automobile upper grille and the rectangular frame base of the spraying jig;
and 4, step 4: spraying: spraying a primer, keeping the distance between a spray gun and the upper and lower grids of the automobile within 15cm, controlling the film thickness to be between 10 and 20 microns, leveling the upper and lower grids of the automobile at 22 to 28 ℃ after spraying is finished, spraying a finish after leveling for 5 to 10min, and controlling the film thickness to be between 25 and 40 microns;
and 5: baking: and after the spraying is finished, sending the mixture to a baking oven with the temperature of 75-85 ℃ for baking for 30-40 min, then taking out the mixture, and standing for 20-24 h.
2. The combined surface treatment method for the upper and lower grilles of the automobile as claimed in claim 1, wherein: and the dust removal treatment in the step 1 is specifically to remove dust on the back and the front of the upper and lower grids of the automobile once by using an air gun, wipe the paint spraying area of the upper and lower grids of the automobile by using the dust-free cloth dipped with isopropanol, remove dust once after wiping is finished, and enable the distance between the electrostatic dust removal air gun and the upper and lower grids of the automobile to be 5-15 cm.
3. The combined surface treatment method for the upper and lower grilles of the automobile as claimed in claim 1, wherein: the spraying conditions in the step 4 are as follows: air pressure is 2.5-4.5 kg/cm2The temperature is 22-28 ℃, and the humidity is 50-70%.
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| CN111151425B (en) | 2022-06-03 |
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