CN117505199A - Powder spraying and coating treatment process for parts - Google Patents
Powder spraying and coating treatment process for parts Download PDFInfo
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- CN117505199A CN117505199A CN202311489476.1A CN202311489476A CN117505199A CN 117505199 A CN117505199 A CN 117505199A CN 202311489476 A CN202311489476 A CN 202311489476A CN 117505199 A CN117505199 A CN 117505199A
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- 239000000843 powder Substances 0.000 title claims abstract description 152
- 238000000576 coating method Methods 0.000 title claims abstract description 52
- 239000011248 coating agent Substances 0.000 title claims abstract description 49
- 238000005507 spraying Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000008569 process Effects 0.000 title claims abstract description 31
- 238000004140 cleaning Methods 0.000 claims abstract description 27
- 230000009471 action Effects 0.000 claims abstract description 13
- 239000000853 adhesive Substances 0.000 claims abstract description 7
- 230000001070 adhesive effect Effects 0.000 claims abstract description 7
- 239000004519 grease Substances 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 4
- 239000007921 spray Substances 0.000 claims description 29
- 238000001035 drying Methods 0.000 claims description 24
- 239000002245 particle Substances 0.000 claims description 16
- 239000003973 paint Substances 0.000 claims description 9
- 239000000725 suspension Substances 0.000 claims description 8
- 230000007797 corrosion Effects 0.000 claims description 7
- 238000005260 corrosion Methods 0.000 claims description 7
- 239000004593 Epoxy Substances 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 6
- 230000005684 electric field Effects 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 6
- 238000005243 fluidization Methods 0.000 claims description 5
- 230000006378 damage Effects 0.000 claims description 4
- 229920001187 thermosetting polymer Polymers 0.000 claims description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 3
- 238000009825 accumulation Methods 0.000 claims description 3
- 238000005422 blasting Methods 0.000 claims description 3
- 238000005238 degreasing Methods 0.000 claims description 3
- 238000005237 degreasing agent Methods 0.000 claims description 3
- 239000013527 degreasing agent Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 238000007590 electrostatic spraying Methods 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 238000010297 mechanical methods and process Methods 0.000 claims description 3
- 229920000728 polyester Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 238000002203 pretreatment Methods 0.000 claims description 3
- 238000005488 sandblasting Methods 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 239000004094 surface-active agent Substances 0.000 claims description 3
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 2
- 239000000243 solution Substances 0.000 description 10
- 238000009713 electroplating Methods 0.000 description 7
- 238000007747 plating Methods 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
- B05D1/06—Applying particulate materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- 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
- B05B13/0264—Overhead conveying means, i.e. the object or other work being suspended from the conveying means; Details thereof, e.g. hanging hooks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B16/00—Spray booths
- B05B16/20—Arrangements for spraying in combination with other operations, e.g. drying; Arrangements enabling a combination of spraying operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/08—Plant for applying liquids or other fluent materials to objects
- B05B5/081—Plant for applying liquids or other fluent materials to objects specially adapted for treating particulate materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/16—Arrangements for supplying liquids or other fluent material
- B05B5/1683—Arrangements for supplying liquids or other fluent material specially adapted for particulate materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
- B05D3/0272—After-treatment with ovens
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Electrostatic Spraying Apparatus (AREA)
Abstract
The invention discloses a powder spraying and coating treatment process for parts, and relates to the technical field of powder spraying of parts. The powder spraying and coating treatment process for the parts comprises the following steps of: s1, preparing before powder spraying: clean the powder spraying chamber and clean the powder supply device, so that the powder spraying chamber is kept clean in the environment of powder spraying, S2 and workpiece cleaning: the surface pretreatment is used for removing oxides, greasy dirt and other dirt on the surface of a workpiece so as to improve the adhesive force of a powder coating, heating to a process temperature, and using the mechanical action of spraying or circulating stirring to assist to soften the greasy dirt on the surface of the workpiece, and then splitting a dissolved part of the greasy dirt from the surface of the workpiece so as to achieve the aim of cleaning the grease on the surface of the workpiece.
Description
Technical Field
The invention relates to the technical field of component powder spraying, in particular to a process for coating and attaching component powder.
Background
At present, in order to prolong the service life and enhance the service effect of parts used on some machines or equipment, most parts are subjected to surface treatment, or electroplating or coating, and in terms of electroplating, the surface of an electroplated part is smooth and corrosion-resistant, and is a common method for surface treatment. Before electroplating, the workpiece is generally treated, for example: the electroplated parts on the motorcycle generally need to be deoiled and derusted, generally deoiled in alkali liquor and derusted in acid liquor, or deoiled and derusted in a mixed solution prepared from corrosive agent and emulsifying agent, and after deoiling and derusting, weak corrosion treatment is also needed to be carried out for removing residual greasy dirt and acid, then water washing is carried out, and after water washing, the electroplating effect can be achieved through three times of nickel plating and one time of chromium plating, or one time of copper plating, two times of nickel plating and one time of chromium plating.
Although the traditional electroplating process is mature, the traditional electroplating process has a plurality of defects: the process is complicated, the cost is high, the processing time is long, and for the parts processed on the production line, the whole processing period is prolonged due to the long-time processing of a certain part, and excessive corrosion is easy to generate when pickling is carried out.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides a powder spraying and coating treatment process for parts, which solves the problems that the traditional electroplating process is mature but has a plurality of defects: the process is complicated, the cost is high, the processing time is long, and for the parts processed on the assembly line, the whole processing period is prolonged due to the long-time processing of a certain part, and in addition, the excessive corrosion problem is easy to generate when the pickling is carried out.
(II) technical scheme
In order to achieve the above purpose, the invention is realized by the following technical scheme: a powder spraying and coating treatment process for parts comprises the following steps:
s1, preparing before powder spraying: cleaning the powder spraying chamber and cleaning the powder supply device so that the powder spraying chamber is kept clean in a powder spraying environment;
s2, cleaning a workpiece: surface pretreatment, namely removing oxides, greasy dirt and other dirt on the surface of a workpiece so as to improve the adhesive force of a powder coating, and removing rust and corrosion by a mechanical method of sand blasting and shot blasting;
s3, alkaline degreasing: preparing degreasing agent and surfactant into working tank liquor according to a certain proportion, heating to a process temperature, and using spraying or circulating stirring mechanical action to assist to soften oil stains on the surface of a hardened workpiece, enabling a dissolved part to undergo a chemical reaction, and then splitting the dissolved part with the surface of the workpiece so as to achieve the aim of cleaning the oil on the surface of the workpiece;
s4, hanging: fitting a hanger on a matching surface of the workpiece to be protected, wherein a gap larger than 2 mm cannot be formed between the hanger and the matching surface after the hanger is fitted;
s5, drying the workpiece: putting the powder to be used into drying equipment, and drying at a required temperature;
s6, electrostatic spraying: when powder paint passes through the spray gun, high voltage generated by a high-voltage electrostatic generator is added at the front end of the spray gun, electric charge is generated near the spray gun after corona discharge, and when powder is sprayed out from a gun nozzle, a loop is formed to form charged paint particles which are attracted to a workpiece with opposite polarity under the action of an electric field;
s7, heating and curing: when the workpiece subjected to powder spraying is put into a drying chamber for drying, the workpiece is dried at a high temperature of 180 ℃ for 20 minutes, so that the gloss between the powder and the workpiece is plump and the coating is uniform;
s8, checking products: and placing the processed workpiece on a detection table, and checking the workpiece according to the appearance quality requirement by the processed workpiece.
Preferably, the coating powder sprayed in the step S1 is thermosetting powder, including epoxy, epoxy modified polyester, polyurethane and acrylic.
Preferably, the suspension conveyor in the step S4 is a conveying system of an industrial assembly line and a coating line, the accumulation type suspension conveyor is applied to a storage shelf with l=10-14M and a coating line of a special-shaped street lamp alloy steel pipe, a workpiece is hoisted on a special hanger to bear 500-600KG, a turnout is smooth in entering and exiting, the turnout is opened and closed under electrical control according to a working instruction, and automatic conveying of the workpiece at each processing station is met.
Preferably, in the step S5, the drying device has good heat preservation, uniform temperature in the furnace and less heat loss, and the temperature difference in the furnace is less than +/-3 ℃ through test.
Preferably, the pre-sprayed workpiece in step S2 is subjected to a pre-treatment to remove grease and dust on the surface of the workpiece, so that good adhesion of a subsequent coating is ensured, and the comprehensive performance and quality of the layer are improved.
Preferably, the powder supply device in the step S1 is composed of a new powder barrel, a rotary screen and a powder supply barrel, powder paint is firstly added into the new powder barrel, compressed air is used for pre-fluidizing powder through micropores on a fluidization plate at the bottom of the new powder barrel, then the powder is conveyed to the rotary screen through a powder pump, the powder particles with overlarge particle size are separated by the rotary screen, the residual powder falls into the powder supply barrel, and the powder is supplied to a spray gun for spraying a workpiece through the powder pump and a powder supply pipe after the powder is fluidized into a prescribed shape by the powder supply barrel.
Preferably, in the step S6, when the workpiece is sprayed with powder, the powder falling on the processing table should be cleaned in time.
Preferably, in step S7, when impurities exist in the curing oven, the inner wall of the curing oven is thoroughly cleaned by wet cloth and a dust collector, and for the gaps between the hanging chains and the air pipes, the occurrence of black large-particle impurities needs to be checked to determine whether the air supply pipe filter screen has a broken position.
Preferably, the pressure during cleaning in the step S2 is 05MPa.
Preferably, the speed of the movement of the spray gun in the step S6 is 30-60 cm/S.
(III) beneficial effects
The invention provides a powder spraying and coating treatment process for parts. The beneficial effects are as follows:
the powder spraying chamber is cleaned and the powder supplying device is cleaned, oxide, greasy dirt and other dirt on the surface of a workpiece are removed, so that the adhesive force of a powder coating is improved, the greasy dirt on the surface is softened, a dissolved part is subjected to chemical reaction and then is split with the surface of the workpiece, the aim of cleaning grease on the surface of the workpiece is fulfilled, the workpiece is matched with a matching surface to be protected, a hanger is arranged on the matching surface, powder to be used is placed into drying equipment, drying treatment is carried out according to the required temperature, when the powder coating passes through a spray gun, high voltage generated by a high-voltage electrostatic generator is added at the front end of the spray gun, electric charge is generated near the spray gun after corona discharge, and when the powder is sprayed out by the spray gun nozzle, a loop is formed to form charged coating particles which are sucked onto the workpiece with opposite polarity under the action of an electric field.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the present invention provides a technical solution: a powder spraying and coating treatment process for parts comprises the following steps:
s1, preparing before powder spraying: cleaning the powder spraying chamber and cleaning the powder supply device so that the powder spraying chamber is kept clean in a powder spraying environment;
s2, cleaning a workpiece: surface pretreatment, namely removing oxides, greasy dirt and other dirt on the surface of a workpiece so as to improve the adhesive force of a powder coating, and removing rust and corrosion by a mechanical method of sand blasting and shot blasting;
s3, alkaline degreasing: preparing degreasing agent and surfactant into working tank liquor according to a certain proportion, heating to a process temperature, and using spraying or circulating stirring mechanical action to assist to soften oil stains on the surface of a hardened workpiece, enabling a dissolved part to undergo a chemical reaction, and then splitting the dissolved part with the surface of the workpiece so as to achieve the aim of cleaning the oil on the surface of the workpiece;
s4, hanging: fitting a hanger on a matching surface of the workpiece to be protected, wherein a gap larger than 2 mm cannot be formed between the hanger and the matching surface after the hanger is fitted;
s5, drying the workpiece: putting the powder to be used into drying equipment, and drying at a required temperature;
s6, electrostatic spraying: when powder paint passes through the spray gun, high voltage generated by a high-voltage electrostatic generator is added at the front end of the spray gun, electric charge is generated near the spray gun after corona discharge, and when powder is sprayed out from a gun nozzle, a loop is formed to form charged paint particles which are attracted to a workpiece with opposite polarity under the action of an electric field;
s7, heating and curing: when the workpiece subjected to powder spraying is put into a drying chamber for drying, the workpiece is dried at a high temperature of 180 ℃ for 20 minutes, so that the gloss between the powder and the workpiece is plump and the coating is uniform;
s8, checking products: and placing the processed workpiece on a detection table, and checking the workpiece according to the appearance quality requirement by the processed workpiece.
When the powder spraying device is in use, the powder spraying chamber is cleaned and the powder supplying device is cleaned, oxide, greasy dirt and other dirt on the surface of a workpiece are removed, so that the adhesive force of a powder coating is improved, the greasy dirt on the surface is softened, a dissolved part is subjected to chemical reaction and then is split with the surface of the workpiece, the aim of cleaning grease on the surface of the workpiece is achieved, the workpiece is matched with a matching surface to be protected, a hanger is arranged on the matching surface, powder to be used is placed into drying equipment, drying treatment is carried out according to the required temperature, when the powder coating passes through a spray gun, high voltage generated by a high-voltage electrostatic generator is added at the front end of the spray gun, electric charge is generated near the spray gun after corona discharge, and when the powder is sprayed out by a gun nozzle, a loop is formed into charged coating particles which are sucked onto the workpiece with opposite polarity under the action of an electric field.
Referring to fig. 1, the present invention provides a technical solution: the powder sprayed in the step S1 refers to thermosetting powder, and comprises epoxy, epoxy modified polyester, polyurethane and acrylic acid.
In operation, the powder is more stable when spraying powder by using thermosetting powder.
Referring to fig. 1, the present invention provides a technical solution: the suspension conveyor in the step S4 is a conveying system of an industrial assembly line and a coating line, the accumulation type suspension conveyor is applied to a storage shelf with L=10-14M and a special-shaped street lamp alloy steel pipe coating line, a workpiece is hoisted on a special hanger to bear 500-600KG, a turnout in and out is smooth, the turnout is opened and closed under the electrical control according to a working instruction, and the automatic conveying of the workpiece at each processing station is met.
When the automatic conveying device works, the turnout is opened and closed under the electric control according to the working instruction, so that the automatic conveying of the workpiece at each processing station is met.
Referring to fig. 1, the present invention provides a technical solution: and in the step S5, the heat preservation performance of the drying equipment is good, the temperature in the furnace is uniform, the heat loss is less, and the temperature difference in the furnace is less than +/-3 ℃ through test.
When the powder is used, the powder is kept in a good state when the workpiece is needed to be used.
Referring to fig. 1, the present invention provides a technical solution: in the step S2, pre-treatment is carried out on the pre-sprayed workpiece, so that grease and dust on the surface of the workpiece are removed, good adhesion of subsequent coatings is guaranteed, and the comprehensive performance and quality of the pattern layer are improved.
When the coating works, good adhesion of subsequent coatings is guaranteed, and the comprehensive performance and quality of the layer are improved.
Referring to fig. 1, the present invention provides a technical solution: the powder supply device in S1 is composed of a new powder barrel, a rotary screen and a powder supply barrel, wherein powder paint is firstly added into the new powder barrel, compressed air is used for pre-fluidizing powder through micropores on a fluidization plate at the bottom of the new powder barrel, then the powder is conveyed to the rotary screen through a powder pump, the powder particles with overlarge particle size are separated by the rotary screen, the residual powder falls into the powder supply barrel, and after the powder is fluidized into a specified state by the powder supply barrel, the powder is supplied to a spray gun for spraying a workpiece through the powder pump and a powder supply pipe.
In operation, too high a fluidization pressure inside the powder supply tank reduces the powder density, which reduces the production efficiency, and too low a fluidization pressure may cause agglomeration of the powder.
Referring to fig. 1, the present invention provides a technical solution: in the step S6, when the workpiece is sprayed with powder, the powder falling on the processing table should be cleaned in time.
During operation, static electricity is prevented from occurring on falling powder, so that injury is caused to workers.
Referring to fig. 1, the present invention provides a technical solution: in the step S7, when impurities exist in the curing oven, the inner wall of the curing oven is thoroughly cleaned through wet cloth and a dust collector, and for gaps of a suspension chain and an air pipe, whether the filter screen of the air supply pipe has damage or not is checked when black large-particle impurities appear.
During operation, if not timely cleaning the inside of the curing oven, damage to the air pipe filter screen can be caused.
Referring to fig. 1, the present invention provides a technical solution: the pressure in the step S2 is 05MPa.
When the gun cleaning device works, the gun cleaning head can be accelerated to grind when the gun cleaning pressure is too high, and the gun cleaning head can be blocked when the gun cleaning pressure is too low.
Referring to fig. 1, the present invention provides a technical solution: the speed of the spray gun moving in the step S6 is 30-60 cm/S.
When the spray gun works, the spray gun moves too fast, the coating can be thin, and the spraying effect is thick and clumsy; too slow movement of the spray gun, too thick coating film can produce sagging.
In summary, the powder spraying coating treatment process for parts is used for cleaning a powder spraying chamber and cleaning a powder supply device, so that oxides, greasy dirt and other dirt on the surface of a workpiece are removed, the adhesive force of a powder coating is improved, the greasy dirt on the surface is softened, a dissolved part is subjected to chemical reaction and then is split with the surface of the workpiece, the aim of cleaning the grease on the surface of the workpiece is achieved, a hanger is arranged on the matching surface of the workpiece to be protected, powder to be used is placed into a drying device, drying treatment is carried out according to the required temperature, when the powder coating passes through a spray gun, high pressure generated by a high-voltage electrostatic generator is added at the front end of the spray gun, electric charge is generated near the spray gun after corona discharge, and when the powder is sprayed out from the spray gun nozzle, a loop is formed into charged coating particles, and the charged coating particles are sucked onto the workpiece with opposite polarity under the action of an electric field.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A powder spraying and coating treatment process for parts is characterized in that: the method comprises the following steps:
s1, preparing before powder spraying: cleaning the powder spraying chamber and cleaning the powder supply device so that the powder spraying chamber is kept clean in a powder spraying environment;
s2, cleaning a workpiece: surface pretreatment, namely removing oxides, greasy dirt and other dirt on the surface of a workpiece so as to improve the adhesive force of a powder coating, and removing rust and corrosion by a mechanical method of sand blasting and shot blasting;
s3, alkaline degreasing: preparing degreasing agent and surfactant into working tank liquor according to a certain proportion, heating to a process temperature, and using spraying or circulating stirring mechanical action to assist to soften oil stains on the surface of a hardened workpiece, enabling a dissolved part to undergo a chemical reaction, and then splitting the dissolved part with the surface of the workpiece so as to achieve the aim of cleaning the oil on the surface of the workpiece;
s4, hanging: fitting a hanger on a matching surface of the workpiece to be protected, wherein a gap larger than 2 mm cannot be formed between the hanger and the matching surface after the hanger is fitted;
s5, drying the workpiece: putting the powder to be used into drying equipment, and drying at a required temperature;
s6, electrostatic spraying: when powder paint passes through the spray gun, high voltage generated by a high-voltage electrostatic generator is added at the front end of the spray gun, electric charge is generated near the spray gun after corona discharge, and when powder is sprayed out from a gun nozzle, a loop is formed to form charged paint particles which are attracted to a workpiece with opposite polarity under the action of an electric field;
s7, heating and curing: when the workpiece subjected to powder spraying is put into a drying chamber for drying, the workpiece is dried at a high temperature of 180 ℃ for 20 minutes, so that the gloss between the powder and the workpiece is plump and the coating is uniform;
s8, checking products: and placing the processed workpiece on a detection table, and checking the workpiece according to the appearance quality requirement by the processed workpiece.
2. The process for powder coating of components according to claim 1, wherein: the powder sprayed in the step S1 refers to thermosetting powder, and comprises epoxy, epoxy modified polyester, polyurethane and acrylic acid.
3. The process for powder coating of components according to claim 1, wherein: the suspension conveyor in the step S4 is a conveying system of an industrial assembly line and a coating line, the accumulation type suspension conveyor is applied to a storage shelf with L=10-14M and a special-shaped street lamp alloy steel pipe coating line, a workpiece is hoisted on a special hanger to bear 500-600KG, a turnout in the turnout is smooth, the turnout is opened and closed under the electrical control according to a working instruction, and the automatic conveying of the workpiece at each processing station is met.
4. The process for powder coating of components according to claim 1, wherein: the drying equipment in the step S5 has good heat preservation, uniform temperature in the furnace and less heat loss, and the temperature difference in the furnace is less than +/-3 ℃ through test.
5. The process for powder coating of components according to claim 1, wherein: in the step S2, pre-treatment is carried out on the pre-sprayed workpiece, so that grease and dust on the surface of the workpiece are removed, good adhesion of subsequent coatings is ensured, and the comprehensive performance and quality of the layers are improved.
6. The process for powder coating of components according to claim 1, wherein: the powder supply device in S1 is composed of a new powder barrel, a rotary screen and a powder supply barrel, powder paint is firstly added into the new powder barrel, compressed air is used for pre-fluidizing powder through micropores on a fluidization plate at the bottom of the new powder barrel, then the powder is conveyed to the rotary screen through a powder pump, powder particles with overlarge particle size are separated through the rotary screen, the residual powder falls into the powder supply barrel, and after the powder is fluidized into a prescribed shape by the powder supply barrel, the powder is supplied to a spray gun through a powder pump and a powder supply pipe for spraying workpieces.
7. The process for powder coating of components according to claim 1, wherein: in the step S6, when the workpiece is sprayed with powder, the powder falling on the processing table should be cleaned in time.
8. The process for powder coating of components according to claim 1, wherein: in the step S7, when impurities exist in the curing oven, the inner wall of the curing oven is thoroughly cleaned through wet cloth and a dust collector, and for gaps of a suspension chain and an air pipe, whether the filter screen of the air supply pipe has damage or not is checked when black large-particle impurities appear.
9. The process for powder coating of components according to claim 1, wherein: the pressure in the cleaning in the step S2 is 05MPa.
10. The process for powder coating of components according to claim 1, wherein: the speed of the spray gun moving in the step S6 is 30-60 cm/S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311489476.1A CN117505199A (en) | 2023-11-10 | 2023-11-10 | Powder spraying and coating treatment process for parts |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311489476.1A CN117505199A (en) | 2023-11-10 | 2023-11-10 | Powder spraying and coating treatment process for parts |
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| Publication Number | Publication Date |
|---|---|
| CN117505199A true CN117505199A (en) | 2024-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311489476.1A Pending CN117505199A (en) | 2023-11-10 | 2023-11-10 | Powder spraying and coating treatment process for parts |
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| Country | Link |
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| CN (1) | CN117505199A (en) |
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- 2023-11-10 CN CN202311489476.1A patent/CN117505199A/en active Pending
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