CN106423768A - Surface coating method for 3D workpieces - Google Patents
Surface coating method for 3D workpieces Download PDFInfo
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- CN106423768A CN106423768A CN201610822645.2A CN201610822645A CN106423768A CN 106423768 A CN106423768 A CN 106423768A CN 201610822645 A CN201610822645 A CN 201610822645A CN 106423768 A CN106423768 A CN 106423768A
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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
- 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
- B05D3/007—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
- 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
- B05D3/04—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 exposure to gases
- B05D3/0406—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 exposure to gases the gas being air
- B05D3/0413—Heating with air
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- Application Of Or Painting With Fluid Materials (AREA)
Abstract
In order to overcome the problems, such as uneven coating thickness and low production efficiency, of the existing surface coating method for 3D workpieces, the invention provides a surface coating method for 3D workpieces. The surface coating method comprises the following procedures: applying a paint, to be specific, applying the paint on the surfaces of the 3D workpieces; leveling the paint, to be specific, utilizing high-pressure air flow to blow the paint on the surfaces of the 3D workpieces from a plurality of directions so as to form coatings; drying the surfaces of the coatings, to be specific, utilizing high-pressure and high-temperature air flow to blow the coatings on the surfaces of the 3D workpieces from a plurality of directions and enabling the surfaces of the coatings to be dry; and curing the coatings, to be specific, carrying out film drying operation on the coatings with the dry surfaces and curing and shaping the coatings. The coating method provided by the invention can effectively ensure the thickness consistency of the coatings, improve coating effect and coating efficiency, and is particularly suitable for the 3D workpieces with uneven surfaces.
Description
Technical field
The invention belongs to Workpiece coating technical field is and in particular to a kind of method for coating surface of 3D workpiece.
Background technology
External coating is to form one layer of coating with protectiveness, feature or ornamental effect in surface of the work, existing
Coating process include aerial spraying, airless spraying, electrostatic spraying, powder spray, electrophoretic painting, showering, impregnating, fit respectively
For different coating objects.In existing process, when carrying out the external coating of 3D workpiece that some have certain stereochemical structure,
As the curve screens of mobile phone, frequently with the mode of silk screen printing and spraying, wherein silk screen printing is difficult in adapt to the depression of 3D workpiece
The coating in portion is printed, and leads to coating quality to be difficult to control to, and spraying then easily causes coating layer thickness inequality, more especially has rib
The workpiece on side, the coating on two faces easily causes to overlap in seamed edge position, leads to the coating layer thickness of seamed edge position larger, impact
Spraying effect；Traditional showering and dipping are higher to the levelability requirement of coating, if the viscosity of coating is too high, easily occur applying
Layer is difficult to levelling, and viscosity is too low, sagging phenomenon easily, is only applicable to the external coating of plane tabular workpiece, if being used for 3D
The application of workpiece, then also occur the uneven problem of coating layer thickness at knee or seamed edge, and in the larger table of some concavity and convexities
Face is difficult to levelling.
Content of the invention
Method for coating surface for existing 3D workpiece has that coating layer thickness is uneven, the problem of low production efficiency, this
Bright provide a kind of method for coating surface of 3D workpiece, this coating process can effectively ensure that the concordance of coating layer thickness, improve
Painting effect and coating efficiency, are particularly suited for the 3D workpiece of surface irregularity.
The technical scheme that present invention solution above-mentioned technical problem is adopted is as follows：
There is provided a kind of method for coating surface of 3D workpiece, including following operation：
Coating applies：Coating is put on the surface of 3D workpiece；
Coating flattens：From multiple directions, the coating of 3D surface of the work is purged using high pressure draught, form coating；
Coating surface drying：From multiple directions, the coating of 3D surface of the work is purged using high pressure-temperature air-flow, make coating
Surface drying；
Curing of coatings：Dry film operation is carried out to the coating after surface drying, makes curing of coatings molding.
Further, in described coating applying step, method coating being put on the surface of 3D workpiece is as follows：Pass through
Coating is in that heavy curtain shape sprays by multiple shower nozzles, covers 3D workpiece by mask and is not required to coat the surface of coating, by 3D workpiece from painting
Pass through in material, coating showering is in the surface of 3D workpiece.
Further, in described coating applying step, method coating being put on the surface of 3D workpiece is as follows：Pass through
Mask covers 3D workpiece and is not required to coat the surface of coating, 3D workpiece be impregnated in below the liquid level of coating, so that coating is completely covered
Workpiece is taken out after having impregnated by 3D surface of the work.
Further, before described coating applying step, also include the surface of 3D workpiece is carried out pre-treatment, described front place
Reason includes one or more of alkali cleaning, pickling, washing and surface mechanical treatment.
Further, described coating leveling operation includes：It is provided with the first leveling air knife, the second leveling air knife and the 3rd
Leveling air knife；Wherein, described first leveling air knife, the second leveling air knife and the 3rd leveling air knife are in that " door " font arranges, and first
Leveling air knife is located at top, and the second leveling air knife and the 3rd flattens the two bottom sides that air knife is located at the first leveling air knife respectively, the
The stream pressure that one leveling air knife, the second leveling air knife and the 3rd leveling air knife spray gas curtain is 0.03～0.80Mpa, and flow velocity is
5～100m/s；
Mobile 3 D workpiece passes through so as to flatten air knife, the second leveling air knife and the 3rd inside flattening air knife from first, the
The multi-direction gas curtain that one leveling air knife, the second leveling air knife and the 3rd leveling air knife are formed blows to the coating of 3D surface of the work
Sweep, form coating.
Further, described first leveling air knife, second leveling air knife and the 3rd leveling air knife spray gas curtain direction with
Angle between the moving direction of 3D workpiece is 120 °～180 °, and the first leveling air knife, the second leveling air knife and the 3rd leveling
Air knife is 0.5～15.0mm with the distance of 3D surface of the work.
Further, described coating surface drying operation includes：First hot blast knife, the second hot blast knife and the 3rd hot blast are set
Knife, described first hot blast knife, the second hot blast knife and the 3rd hot blast knife are in that " door " font arranges, the first hot blast cutter spacing in top, the
Two hot blast knives and the 3rd hot blast knife are respectively positioned at the two bottom sides of the first hot blast knife, the first hot blast knife, the second hot blast knife and the 3rd
The stream pressure that hot blast knife sprays gas curtain is 0.03～0.50Mpa, and flow velocity is 5～100m/s, and gas flow temperature is more than or equal to 40
℃；
Mobile 3 D workpiece is so as to pass through from the inside of the first hot blast knife, the second hot blast knife and the 3rd hot blast knife, the first hot blast
The multi-direction gas curtain that knife, the second hot blast knife and the 3rd hot blast knife are formed carries out purging heating to the coating of 3D surface of the work, makes painting
Layer surface drying.
Further, described first hot blast knife, the second hot blast knife and the 3rd hot blast knife spray direction and the 3D workpiece of gas curtain
Moving direction between angle be 100 °～180 °, and the first hot blast knife, the second hot blast knife and the 3rd hot blast knife and 3D workpiece
The distance on surface is 1.0～25.0mm.
Further, the quantity of described first hot blast knife, the second hot blast knife and the 3rd hot blast knife be multiple, single first
Hot blast knife, the second hot blast knife and the 3rd hot blast knife are arranged in groups.
Further, described coating is ultraviolet-cured paint；
Described curing of coatings operation includes：
Setting mask covers the position that 3D surface of the work is not required to curing of coatings；
3D workpiece after coverage mask is placed under ultraviolet light, the curing of coatings molding of non-coverage mask；
Mask is separated with 3D workpiece, uncured coating cleaning is eliminated, completes coating process.
In the method for coating surface of the 3D workpiece that the present invention provides, first fluid-coating is put on the table of 3D workpiece
Face, arranges high pressure draught by the different directions in 3D workpiece, thus forming air curtain in the outside of 3D workpiece, on 3D workpiece not
Carry out wind-force purging with the coating on surface, and then promote fluid-coating in the levelling effect of 3D surface of the work, prevent fluid-coating
Assemble in the depressed part of 3D workpiece, ensure that the coating layer thickness of seamed edge highlight is consistent with other positions simultaneously, improve application effect
Really；The technical program is also added into coating surface drying operation after coating leveling operation, passes through High Temperature High Pressure after coating leveling
Gas promote coating surface drying so that coating is converted into not runny state from liquid and surface starts conjunctiva, it is to avoid go out
The sagging phenomenon of existing 3D surface of the work, accelerates coating rate of drying, improves coating efficiency.
Specific embodiment
In order that technical problem solved by the invention, technical scheme and beneficial effect become more apparent, below in conjunction with
Embodiment, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only in order to explain
The present invention, is not intended to limit the present invention.
Embodiment 1
Present embodiments provide a kind of method for coating surface of 3D workpiece, including following operation：
Coating applies：Coating is put on the surface of 3D workpiece；
Coating flattens：From multiple directions, the coating of 3D surface of the work is purged using high pressure draught, form coating；
Coating surface drying：From multiple directions, the coating of 3D surface of the work is purged using high pressure-temperature air-flow, make coating
Surface drying；
Curing of coatings：Dry film operation is carried out to the coating after surface drying, makes curing of coatings molding.
In the present embodiment, what described 3D workpiece referred to is the workpiece with certain stereochemical structure, and 3D workpiece needs application
The surface of coating is nonplanar structure, and the present invention does not limit the concrete structure of 3D workpiece, existing structure, the such as curved surface of mobile phone
Screen, tubular productss etc., all can carry out surface coating application using the method that the present embodiment provides.
Described coating is fluid-coating, is based on resin or oil or emulsion, adds or without pigment, filler, add
Plus corresponding additive, the thick liquid being formulated with organic solvent or water can be coated in object table with different construction technologies
Face, formation adhesion is firm, have some strength, continuous solid film.The film common name film being formed, also known as paint film or coating.
In the present embodiment, in order that coating is formed with the surface of 3D workpiece is preferably combined effect, described coating applies
Before operation, also include the surface appearance according to 3D workpiece and optionally the surface of 3D workpiece carried out with pre-treatment, described before
Process and include one or more of alkali cleaning, pickling, washing, surface mechanical treatment, in order to eliminate the various oil of 3D surface of the work
Dirt and dust, or change the physico-chemical property of 3D surface of the work.
For the 3D workpiece of metal material, by " pre- defat -- water cleaning -- neutralization -- table tune -- phosphatization -- water cleaning --
The technique of drying " carries out the removing of surface grease, oxide, and phosphating process therein is to form one layer in 3D surface of the work to stablize
Insoluble phosphate film layer, phosphate film layer can improve the affinity of metal surface and coating, for good application substrate, have
Beneficial to the adhesion improving between metal class 3D workpiece and coating；
For wooden 3D workpiece, first 3D surface of the work should be carried out with wolline, remove shaggy wood fibre, then
Surface resin and oils and fatss are removed by alkali cleaning and washing, local location is repaired, floats including to color deep place
In vain, embedding benefit is carried out to small holes caused by worms and crack.
For the 3D workpiece of plastic material, need also exist for surface ungrease treatment, further preferably the surface of 3D workpiece is entered
Row polarization process, strengthens surface polarity, increases surface tension, is conducive to the extension levelling effect of post-coatings.
The application face that this coating process is applied is not limited to above-mentioned range of application, same process can also be used for pottery, leather,
The field of coating such as building, all any modification, equivalent and improvement made within the spirit and principles in the present invention etc., all should
It is included within protection scope of the present invention.
In described coating applying step, by the way of showering, carry out coating applying on the surface of 3D workpiece, including following
Step：By multiple shower nozzles, coating is sprayed in heavy curtain shape, the surface that 3D workpiece is not required to coat coating is covered by mask, simultaneously
3D workpiece is fixed on conveyer device, described mask and conveyer device can be integrated setting, conveyer device drive 3D workpiece from
The coating bottom of heavy curtain shape passes through, and coating showering, in the surface of 3D workpiece, arranges coating material recovery bath in the bottom of described shower nozzle, receives
Collection coating simultaneously reuses.
Traditional showering is higher for the levelability requirement of coating, is applied to easily produce in some depressed area during 3D workpiece
Coating remains, and forms coating gathering in some seamed edge extrusion positions, affects coating result, and the present embodiment is directed to this problem and increases
Add coating leveling operation, high pressure draught has been set by the different directions in 3D workpiece, thus forming wind in the outside of 3D workpiece
Curtain, carries out wind-force purging to the coating of different surfaces on 3D workpiece, and then promotes fluid-coating to imitate in the levelling of 3D surface of the work
Really, prevent fluid-coating from assembling in the depressed part of 3D workpiece, ensure coating layer thickness and the other positions one of seamed edge highlight simultaneously
Cause, improve painting effect.
Specifically, described coating leveling operation includes：It is provided with the first leveling air knife, the second leveling air knife and the 3rd whole
Flat air knife, described first leveling air knife, the second leveling air knife and the 3rd leveling air knife are in that " door " font arranges, the first leveling air knife
Spray gas curtain positioned at top and towards obliquely downward, the second leveling air knife and the 3rd leveling air knife are located at the first bottom flattening air knife respectively
Portion both sides, and the second leveling air knife and the 3rd leveling air knife opposite skew direction injection gas curtain, the first leveling air knife, the second leveling
The stream pressure of air knife and the 3rd leveling air knife injection gas curtain is 0.03～0.80Mpa, and flow velocity is 5～100m/s, by controlling
Stream pressure and flow velocity be sized to control the formation thickness of coating, described first leveling air knife, the second leveling air knife and the
The stream pressure of three leveling air knives is consistent with flow velocity, consistent to ensure the coating layer thickness on different directions surface for the 3D workpiece.
By conveyer device mobile 3 D workpiece so as to flatten air knife, the second leveling air knife and the 3rd leveling air knife from first
Inside pass through, the gas curtain of the first leveling air knife, the second leveling air knife and the 3rd leveling air knife blowout corresponds to 3D workpiece respectively
Top surface and two sides, the multi-direction gas curtain that the first leveling air knife, the second leveling air knife and the 3rd leveling air knife are formed is to 3D work
The coating on part surface is purged, and forms coating.
Described first leveling air knife, the second leveling air knife and the 3rd leveling air knife injection direction of gas curtain and the shifting of 3D workpiece
All arrange in 120 °～180 ° between dynamic direction so that described first leveling air knife, the second leveling air knife and the 3rd flatten air knife
The surface of oblique purging 3D workpiece, 3D workpiece moves toward airflow direction, toward external diffusion after air flow contacts to the surface of 3D workpiece,
Form air flow layer, thus promoting the coating of 3D surface of the work toward the direction stream deviating from 3D workpiece movement under the surface of 3D workpiece
Dynamic, promote coating levelling effect, unnecessary coating is blown off the surface of 3D workpiece, enters in accumulator tank and reuses, and first is whole
The distance of flat air knife, the second leveling air knife and the 3rd leveling air knife and 3D surface of the work is 0.5～15.0mm.
Also include coating surface drying operation, promote the surface drying of coating after coating leveling by the gas of High Temperature High Pressure, make
Coating is converted into not runny state from liquid and surface starts conjunctiva, it is to avoid sagging phenomenon in 3D surface of the work, plus
Fast coating rate of drying, improves coating efficiency.
Specifically, described coating surface drying operation includes：First hot blast knife, the second hot blast knife and the 3rd hot blast knife are set,
Described first hot blast knife, the second hot blast knife and the 3rd hot blast knife are in that " door " font arranges, and the first hot blast cutter spacing is in top and towards oblique
Lower section injection gas curtain, the second hot blast knife and the 3rd hot blast knife are located at the two bottom sides of the first hot blast knife respectively, and the second hot blast knife
Opposite skew direction sprays gas curtain with the 3rd hot blast knife, and the first hot blast knife, the second hot blast knife and the 3rd hot blast knife spray gas curtain
Stream pressure is 0.03～0.50Mpa, and flow velocity is 5～100m/s, and gas flow temperature is more than or equal to 40 DEG C, and gas flow temperature can basis
Different coating properties is adjusted, and accelerates the film forming speed of coating surface, prevents sagging.
By conveyer device mobile 3 D workpiece so as to inside from the first hot blast knife, the second hot blast knife and the 3rd hot blast knife
Pass through, the gas curtain top surface of corresponding 3D workpiece and two sides respectively of the first hot blast knife, the second hot blast knife and the blowout of the 3rd hot blast knife
Face, the multi-direction gas curtain that the first hot blast knife, the second hot blast knife and the 3rd hot blast knife are formed blows to the coating of 3D surface of the work
Sweep heating, make coating surface drying.
Described first hot blast knife, the second hot blast knife and the 3rd hot blast knife injection direction of gas curtain and the moving direction of 3D workpiece
Between all arrange so that described first hot blast knife, the second hot blast knife and the 3rd hot blast knife oblique purging 3D work in 100 °～180 °
The surface of part, 3D workpiece moves toward airflow direction, toward external diffusion after air flow contacts to the surface of 3D workpiece, on the surface of 3D workpiece
Lower formation air flow layer, and the distance of the first hot blast knife, the second hot blast knife and the 3rd hot blast knife and 3D surface of the work for 1.0～
25.0mm.
The quantity of described first hot blast knife, the second hot blast knife and the 3rd hot blast knife is multiple, single first hot blast knife,
Two hot blast knives and the 3rd hot blast knife are arranged in groups, and in each group, the first hot blast knife, the second hot blast knife and the 3rd hot blast knife are all in " door "
Font arranges, and is preferably arranged to 2 groups, and sequentially passes through the air curtain of its composition when 3D workpiece is mobile, to accelerate surface drying effect.
In the present embodiment, described coating is ultraviolet-cured paint；Accordingly, described curing of coatings operation includes：
The position setting mask being not required to curing of coatings in 3D surface of the work covers；
3D workpiece after coverage mask is placed under ultraviolet light, the curing of coatings molding of non-coverage mask；
Mask is separated with 3D workpiece, uncured coating cleaning is eliminated, completes coating process.
Embodiment 2
Present embodiment discloses a kind of method for coating surface of 3D workpiece, including the most of technical characteristic in embodiment 1,
Its difference is：
In described coating applying step, by the way of dipping, carry out coating applying on the surface of 3D workpiece, including following
Step：The surface that 3D workpiece is not required to coat coating is covered by mask, 3D workpiece be impregnated in below the liquid level of coating, make coating
3D surface of the work is completely covered, dip time controls in 3～240s it is ensured that the abundant moistening to 3D surface of the work for the fluid-coating,
Dip time should be adjusted according to the property of the thickness of required coating and coating used, need to incite somebody to action before fluid-coating liquid level film forming
Workpiece takes out, and prevents paint film from sticking to the quality being coated surface impact coated film, takes out workpiece and enter next after having impregnated
Step coating leveling operation.
Embodiment 3
Present embodiment discloses a kind of method for coating surface of 3D workpiece.
The present embodiment carries out implementation result analysis using the curve screens of mobile phone, specifically includes following steps：
S1：Curve screens are inverted and are fixed on conveyer device, conveyer device covers the bottom of curve screens, Curved screen
The top surface of curtain is concave face；By multiple shower nozzles, UV curable ink is sprayed in heavy curtain shape, conveyor belts moving surface screen
Curtain horizontally passes through described shower nozzle bottom, the top surface of UV curable ink covering surface screen, it should be noted that institute
The top surface stating curve screens is only for this technique, and the top surface of curve screens refers to curve screens and is installed on mobile phone herein
Towards the face of interior of mobile phone when upper；
S2：：It is provided with the first leveling air knife, the second leveling air knife and the 3rd leveling air knife, described first leveling air knife, the
Two leveling air knives and the 3rd leveling air knife are in that " door " font arranges, and the first leveling air knife is located at top and sprays gas towards obliquely downward
Curtain, second leveling air knife and the 3rd leveling air knife respectively be located at first leveling air knife two bottom sides, and second leveling air knife and
3rd leveling air knife opposite skew direction injection gas curtain, the first leveling air knife, the second leveling air knife and the 3rd leveling air knife injection
The stream pressure of gas curtain is 0.06Mpa, and flow velocity is 10m/s.
By the mobile curve screens of conveyer device so as to flatten air knife, the second leveling air knife and the 3rd leveling wind from first
The inside of knife passes through, and the gas curtain of the first leveling air knife, the second leveling air knife and the 3rd leveling air knife blowout corresponds to Curved screen respectively
The top surface of curtain and two sides, the multi-direction gas curtain pair that the first leveling air knife, the second leveling air knife and the 3rd leveling air knife are formed
The UV curable ink of curve screens is purged, and forms coating.
Described first leveling air knife, the second leveling air knife and the 3rd leveling air knife spray the direction of gas curtain and curve screens
All arrange in 150 ° between moving direction, and the first leveling air knife, the second leveling air knife and the 3rd leveling air knife and curve screens
The distance on surface is 5mm.
S3：First hot blast knife, the second hot blast knife and the 3rd hot blast knife be set, described first hot blast knife, the second hot blast knife and
3rd hot blast knife is in that " door " font arranges, and the first hot blast cutter spacing sprays gas curtain, the second hot blast knife and the in top and towards obliquely downward
Three hot blast knives are located at the two bottom sides of the first hot blast knife respectively, and the second hot blast knife and the injection of the 3rd hot blast knife opposite skew direction
Gas curtain, the stream pressure that the first hot blast knife, the second hot blast knife and the 3rd hot blast knife spray gas curtain is 0.06Mpa, and flow velocity is 10m/
S, gas flow temperature is 60 DEG C.
Described first hot blast knife, the second hot blast knife and the 3rd hot blast knife are provided with two groups, every group all include independent described
First hot blast knife, the second hot blast knife and the 3rd hot blast knife.
By conveyer device mobile 3 D workpiece so as to inside from the first hot blast knife, the second hot blast knife and the 3rd hot blast knife
Pass through, the gas curtain top surface of corresponding 3D workpiece and two sides respectively of the first hot blast knife, the second hot blast knife and the blowout of the 3rd hot blast knife
Face, the multi-direction gas curtain that the first hot blast knife, the second hot blast knife and the 3rd hot blast knife are formed blows to the coating of 3D surface of the work
Sweep heating, make coating surface drying.
Described first hot blast knife, the second hot blast knife and the 3rd hot blast knife injection direction of gas curtain and the moving direction of 3D workpiece
Between all in 120 ° arrange, and the distance of the first hot blast knife, the second hot blast knife and the 3rd hot blast knife and 3D surface of the work be 3mm.
S4：Cover in the end face center setting mask of curve screens；Coating outside mask exposes, by the song after coverage mask
Face screen is placed under ultraviolet light, the curing of coatings molding of non-coverage mask；Mask is separated with curve screens, according to being adopted purple
The type of outer light-curable ink, uncured coating is passed through clear water or organic solvent cleaning eliminates, retain curve screens top
Cured ink coating, obtains sample 1.
Embodiment 4
Present embodiment discloses a kind of method for coating surface of 3D workpiece.
Most of implementation steps of the present embodiment are consistent with embodiment 3, and concrete difference is：
The present embodiment carries out implementation result analysis using section for the coating of the channel-section steel of groove type and natural drying.
In step S2, the stream pressure that the first leveling air knife, the second leveling air knife and the 3rd leveling air knife spray gas curtain is
0.2Mpa, flow velocity is 30m/s.
Described first leveling air knife, the second leveling air knife and the 3rd leveling air knife spray the direction of gas curtain and curve screens
All arrange in 170 ° between moving direction, and the first leveling air knife, the second leveling air knife and the 3rd leveling air knife and curve screens
The distance on surface is 10mm.
In step S4：Channel-section steel is placed, coating air dry cure
Obtain sample 2.
Embodiment 5
Present embodiment discloses a kind of method for coating surface of 3D workpiece.
Most of implementation steps of the present embodiment are consistent with embodiment 3, and concrete difference is：
In step S3, the stream pressure that the first hot blast knife, the second hot blast knife and the 3rd hot blast knife spray gas curtain is 0.2Mpa,
Flow velocity is 30m/s, and gas flow temperature is 50 DEG C.
Described first hot blast knife, the second hot blast knife and the 3rd hot blast knife injection direction of gas curtain and the moving direction of 3D workpiece
Between all in 140 ° arrange, and the distance of the first hot blast knife, the second hot blast knife and the 3rd hot blast knife and 3D surface of the work be 5mm.
Obtain sample 3.
The sample 1～3 obtaining in embodiment 3～5 is compared with prior art showering sample, using coating thickness detector
Carry out coating layer thickness and each point testing flatness, sample surface glossiness test is carried out using glossometer, carry out range estimation simultaneously and see
Examine, it is determined whether sagging phenomenon occurs, record its surface drying time and do solid work the time.
Obtain test result：The method for coating surface being provided by the present invention is processed to 3D workpiece, sample 1～3 with
Prior art showering sample is compared, and its coating layer thickness is relatively thin, and surface each position, including the coating of recessed position and extrusion position
Consistency of thickness, surface gloss is high, through estimating the surface no sag phenomenon of sample 1～3, its surface drying time and when doing solid work simultaneously
Between be significantly shorter compared with prior art showering sample, improve production efficiency.After tested, the 3D that the present invention provides
The method for coating surface of workpiece is particularly suited for the 3D Workpiece coating of surface imperfection.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of method for coating surface of 3D workpiece is it is characterised in that include following operation：
Coating applies：Coating is put on the surface of 3D workpiece；
Coating flattens：From multiple directions, the coating of 3D surface of the work is purged using high pressure draught, form coating；
Coating surface drying：From multiple directions, the coating of 3D surface of the work is purged using high pressure-temperature air-flow, make coating surface drying；
Curing of coatings：Dry film operation is carried out to the coating after surface drying, makes curing of coatings molding.
2. the method for coating surface of 3D workpiece according to claim 1 is it is characterised in that in described coating applying step,
Method coating being put on the surface of 3D workpiece is as follows：By multiple shower nozzles, coating is sprayed in heavy curtain shape, by mask
Cover 3D workpiece to be not required to coat the surface of coating, 3D workpiece is passed through from coating, coating showering is in the surface of 3D workpiece.
3. the method for coating surface of 3D workpiece according to claim 1 is it is characterised in that in described coating applying step,
Method coating being put on the surface of 3D workpiece is as follows：Cover 3D workpiece by mask to be not required to coat the surface of coating, will
3D workpiece impregnated in below the liquid level of coating, makes coating that 3D surface of the work is completely covered, after having impregnated takes out workpiece.
4. the method for coating surface of the 3D workpiece according to any one in claims 1 to 3 is it is characterised in that described painting
Material applying step before, also include the surface of 3D workpiece is carried out pre-treatment, described pre-treatment include alkali cleaning, pickling, washing and
One or more of surface mechanical treatment.
5. the method for coating surface of 3D workpiece according to claim 1 is it is characterised in that wrap in described coating leveling operation
Include：It is provided with the first leveling air knife, the second leveling air knife and the 3rd leveling air knife；Wherein, described first leveling air knife, second whole
Flat air knife and the 3rd leveling air knife are in that " door " font arranges, and the first leveling air knife is located at top, the second leveling air knife and the 3rd whole
Flat air knife is located at the two bottom sides of the first leveling air knife, the first leveling air knife, the second leveling air knife and the 3rd leveling air knife respectively
The stream pressure of injection gas curtain is 0.03～0.80Mpa, and flow velocity is 5～100m/s；
Mobile 3 D workpiece is so as to pass through from the first inside flattening air knife, the second leveling air knife and the 3rd leveling air knife, first is whole
The multi-direction gas curtain that flat air knife, the second leveling air knife and the 3rd leveling air knife are formed purges to the coating of 3D surface of the work,
Form coating.
6. 3D workpiece according to claim 5 method for coating surface it is characterised in that described first leveling air knife, the
The angle that two leveling air knives and the 3rd leveling air knife spray between the direction of gas curtain and the moving direction of 3D workpiece is 120 °～
180 °, and the distance of the first leveling air knife, the second leveling air knife and the 3rd leveling air knife and 3D surface of the work for 0.5～
15.0mm.
7. the method for coating surface of 3D workpiece according to claim 1 is it is characterised in that wrap in described coating surface drying operation
Include：First hot blast knife, the second hot blast knife and the 3rd hot blast knife, described first hot blast knife, the second hot blast knife and the 3rd hot blast are set
Knife is in that " door " font arranges, and in top, the second hot blast knife and the 3rd hot blast knife are located at the first hot blast knife to the first hot blast cutter spacing respectively
Two bottom sides, the stream pressure that the first hot blast knife, the second hot blast knife and the 3rd hot blast knife spray gas curtain is 0.03～
0.50Mpa, flow velocity is 5～100m/s, and gas flow temperature is more than or equal to 40 DEG C；
Mobile 3 D workpiece so as to pass through from the inside of the first hot blast knife, the second hot blast knife and the 3rd hot blast knife, the first hot blast knife,
The multi-direction gas curtain of the second hot blast knife and the formation of the 3rd hot blast knife carries out purging heating to the coating of 3D surface of the work, makes coating table
Dry.
8. 3D workpiece according to claim 7 method for coating surface it is characterised in that described first hot blast knife, second
Angle between the direction of hot blast knife and the 3rd hot blast knife injection gas curtain and the moving direction of 3D workpiece is 100 °～180 °, and the
The distance of one hot blast knife, the second hot blast knife and the 3rd hot blast knife and 3D surface of the work is 1.0～25.0mm.
9. the 3D workpiece according to claim 7 or 8 method for coating surface it is characterised in that described first hot blast knife,
The quantity of two hot blast knives and the 3rd hot blast knife be multiple, single first hot blast knife, the second hot blast knife and the 3rd hot blast knife be one
Group setting.
10. the method for coating surface of 3D workpiece according to claim 1 is it is characterised in that described coating is UV-curing
Change paint；
Described curing of coatings operation includes：
Setting mask covers the position that 3D surface of the work is not required to curing of coatings；
3D workpiece after coverage mask is placed under ultraviolet light, so that the curing of coatings molding of non-coverage mask；
Mask is separated with 3D workpiece, uncured coating cleaning is eliminated, completes coating process.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610822645.2A CN106423768A (en) | 2016-09-14 | 2016-09-14 | Surface coating method for 3D workpieces |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610822645.2A CN106423768A (en) | 2016-09-14 | 2016-09-14 | Surface coating method for 3D workpieces |
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| CN201610822645.2A Pending CN106423768A (en) | 2016-09-14 | 2016-09-14 | Surface coating method for 3D workpieces |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107377326A (en) * | 2017-07-24 | 2017-11-24 | 任泳华 | It is a kind of to catch up with water installations for water paint |
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