CN112188765B - 5G case base production forming process - Google Patents
5G case base production forming process Download PDFInfo
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- CN112188765B CN112188765B CN202011084238.9A CN202011084238A CN112188765B CN 112188765 B CN112188765 B CN 112188765B CN 202011084238 A CN202011084238 A CN 202011084238A CN 112188765 B CN112188765 B CN 112188765B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/02—Details
- H05K5/0217—Mechanical details of casings
- H05K5/0234—Feet; Stands; Pedestals, e.g. wheels for moving casing on floor
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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
- B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
- B05B14/10—Arrangements for collecting, re-using or eliminating excess spraying material the excess material being particulate
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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
- B05D1/12—Applying particulate materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/32—Processes for applying liquids or other fluent materials using means for protecting parts of a surface not to be coated, e.g. using stencils, resists
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
The invention discloses a 5G case base production molding process, which comprises the following steps: 1. die casting, 2, CNC processing, 3, surface cleaning and oxidation treatment, 4, drying, 5, cleaning of impurities in tooth holes, 6, assembling, 7, upper protection, 8, spraying, 9, lower protection, 10 and packaging. Through the surface cleaning and oxidation treatment process, oil stains, dirt, dust and the like on the chassis base are cleaned, so that a stable conductive oxidation film is formed on the surface of the chassis base, and the corrosion resistance of the chassis base is greatly improved. Meanwhile, impurities and the like in the chassis base are further cleaned through tooth hole cleaning and lower protection processes, so that normal work of electronic components in the chassis base is guaranteed; the upper protection process is used for comprehensively protecting and covering the chassis base before spraying, so that the situation that the surface which is not sprayed is sprayed with paint is avoided, and defective products are reduced; after the spraying is finished, the powder on the protective workpiece is recycled, so that the resources are saved.
Description
Technical Field
The invention relates to the technical field of 5G case production, in particular to a 5G case base production forming process.
Background
With the advent of the 5G era, 5G cabinets are more and more widely applied, and the 5G cabinets comprise cabinet bases and cabinet covers covered on the cabinet bases.
When the chassis base is used, a large number of electronic components need to be installed in the chassis base, so impurities, powder and the like cannot be reserved in the inner cavity of the chassis base, but the impurities, the powder and the like can be reserved in the existing chassis after the existing chassis is processed, and the installation and the use of the electronic components are not facilitated. Meanwhile, in the surface oxidation process of the chassis base, the conductive oxide film formed on the surface of the chassis base is unstable due to incomplete cleaning and dissolution of stains on the surface of the chassis base. In the spraying process, the surface of the chassis base which does not need to be sprayed is not fully protected, so that powder is sprayed on the surface which does not need to be sprayed, defective products are increased, and the powder sprayed on the protective workpiece cannot be recycled, so that the resource waste is caused.
Disclosure of Invention
In view of the above, the present invention is directed to the defects existing in the prior art, and a main object of the present invention is to provide a 5G chassis base production molding process, which effectively solves the problems that the installation and use of electronic components are not facilitated, the conductive oxide film on the surface of the chassis base is unstable, the defective products are increased, and the powder sprayed on the protective workpiece cannot be recycled, resulting in the waste of resources.
In order to achieve the purpose, the invention adopts the following technical scheme:
A5G case base production forming process comprises the following steps:
step 1, die-casting, namely die-casting an aluminum magnesium alloy incoming material in a die-casting die to form a chassis base;
step 2, CNC machining, namely taking the cooled chassis base out of the die-casting die and putting the chassis base into a CNC machine tool for machining;
step 3, surface cleaning and oxidation treatment, namely, installing the processed case base into an iron mesh frame, placing the case base in the iron mesh frame in an inclined mode, enabling cleaning bath solution to flow out conveniently, placing the framed case base into a cleaning oxidation line to perform surface cleaning and oxidation treatment, and comprising the following steps:
3.1, ultrasonic pre-degreasing, namely putting the processed chassis base into an ultrasonic pre-degreasing groove, and performing ultrasonic pre-degreasing on the chassis base by using environment-friendly degreasing liquid in the ultrasonic pre-degreasing groove under the action of ultrasonic waves to remove oil stains and dirt on the surface of a product;
3.2, ultrasonic main degreasing, namely putting the pre-degreased case base into an ultrasonic main degreasing tank, and carrying out ultrasonic main degreasing on the case base by using environment-friendly degreasing liquid in the ultrasonic main degreasing tank under the action of ultrasonic waves to remove an oxide film, oil stains and dirt on the surface of a product;
step 3.3, washing with tap water 1, namely putting the chassis base subjected to ultrasonic main degreasing into a first washing tank, and washing the product with tap water in the first washing tank to remove dirt;
step 3.4, washing with tap water 2, namely putting the chassis base washed in the tap water washing 1 into a second washing tank, and washing the product with tap water in the second washing tank to remove dirt;
step 3.5, activating, namely putting the chassis base which is washed in the tap water washing step 2 into an activation tank to react with an activation solution, removing surface oxides and organic matters, and roughening the surface;
step 3.6, washing with tap water 3, namely putting the chassis base subjected to the activation reaction into a third washing tank, and washing the product with tap water in the third washing tank to remove dirt;
step 3.7, washing with tap water 4, namely putting the chassis base washed in the tap water washing 3 into a fourth washing tank, and washing the product with tap water in the fourth washing tank to remove dirt;
step 3.8, pure water washing 1, namely, putting the chassis base which is washed in the tap water washing 4 into a first pure water tank, and washing the product by pure water in the first pure water tank to remove dirt;
step 3.9, passivating 1, namely putting the chassis base washed in the pure water washing 1 into a first passivating tank to react with passivating liquid, so that a conductive oxide film with good corrosion resistance is generated on the surface of the chassis base;
step 3.10, passivating 2, namely putting the chassis base passivated in the passivation 1 into a second passivation tank to react with passivation solution, so that a conductive oxide film with good corrosion resistance is further generated on the surface of the chassis base;
step 3.11, washing with tap water 5, namely putting the chassis base subjected to the passivation reaction into a fifth washing tank, and washing the product with the tap water in the fifth washing tank to remove dirt;
step 3.12, washing with tap water 6, namely putting the chassis base washed in the tap water washing 5 into a sixth washing tank, and washing the product with tap water in the sixth washing tank to remove dirt;
step 3.13, pure water washing 2, namely, putting the chassis base washed in the tap water washing 6 into a second pure water tank, and washing the product by pure water in the second pure water tank to remove dirt;
step 4, drying, namely taking the chassis base with the surface cleaned and oxidized from the iron net frame, blowing scraps by a tool and blowing accumulated water in the deep part of the chassis base by an air gun, and avoiding water stain remained after drying; then the chassis base is placed into a drying line to dry the moisture on the chassis base;
and 5, cleaning impurities in the tooth holes, taking down the dried case base, slightly throwing the case base with the inner cavity surface facing downwards on the workbench for 2-3 times, and shaking off the impurities in the tooth holes.
Step 6, assembling, namely assembling spare and accessory parts on the chassis base, and carrying out airtight detection on the chassis base;
step 7, protecting, namely pasting protective silica gel on the inner cavity surface of the chassis base, pasting protective adhesive paper on the light guide column position and the two end surface window positions, and plugging a thread protective rubber plug on the threaded hole; it is used to avoid spraying to these protected places;
step 8, spraying, namely hanging the chassis base in a spraying line, and spraying paint on the surface of the chassis base, wherein the method comprises the following steps:
8.1, feeding and filling a rubber plug, checking whether protective silica gel in an inner cavity of a product is in place or not, then checking whether the conductivity of a hook is good or not, after confirming that the product protection and the conductivity of the hook are OK, lightly taking the product to hang on the hook of the production line, then checking protection, and judging whether a leakage thread hole is protected or not and the tool is tilted, if leakage protection and tilting exist, using a thread rubber plug to fill leakage, and leveling the tool tilting position again;
8.2, spraying powder by a manipulator, wherein the assembly line drives the chassis base to operate, and the manipulator sprays powder to the chassis base according to set parameters; a spraying film layer is formed on the surface of the chassis base;
8.3, removing protection and solidification, after powder spraying is finished, firstly removing rubber plugs protected by threaded holes of products, sequentially placing the rubber plugs into a specified rubber frame in a classified mode, and placing the rubber plugs into a dust recovery system after a certain amount of rubber plugs are collected to blow off surface dust; then, tearing off protective gummed paper at the position of the light guide column and the positions of the windows on the two end faces, completely tearing off the gummed paper, and blowing away the flying powder in the inner cavity by using an air gun; then, the product enters a baking area, the sprayed powder is solidified, and after the product is baked and taken out of the oven, the residual protective gummed paper and the rubber plug are taken down and placed in a specified recovery frame;
step 8.4, blanking, namely taking the products off the hooks of the assembly line one by one; and is placed on the pallet regularly;
step 9, performing lower protection, namely performing lower protection treatment on the sprayed chassis base;
and step 10, packaging, namely packaging the processed chassis base.
As a preferable scheme, the environment-friendly degreasing solution in the ultrasonic pre-degreasing tank is formed by mixing an LF-031K18 environment-friendly degreasing agent and water, and the LF-031K18 environment-friendly degreasing agent accounts for 5-10% of the environment-friendly degreasing solution; the total alkalinity of the environment-friendly degreasing fluid is as follows: 10-20, working temperature: 55. + -. 10 ℃ pH: 10-12, working time of ultrasonic main degreasing: 6-8 min; and the formula of the environment-friendly degreasing fluid in the ultrasonic main degreasing tank is the same as that of the environment-friendly degreasing fluid in the ultrasonic pre-degreasing tank, and the working time, the pH value and the working temperature are the same.
As a preferable mode, the PH of the tap water in the tap water wash 1 and the tap water wash 2 is: 7-9, running water overflows when the two tanks work, and the washing time is as follows: 10-30 seconds.
As a preferable scheme, the activating liquid in the activating tank is formed by mixing an LF-029P2 activating agent with water, and the LF-029P2 activating agent accounts for 5-10% of the activating liquid; pH of the activating solution: 0.5-2, total acidity: 10-25, activation reaction working time: 0.5-1 min.
As a preferable scheme, the PH of tap water in the tap water wash 3 is: 5-7, running water overflows when the washing machine works, and the washing time is as follows: 10-30 seconds; and the pH value, the working principle and the water washing time of tap water in the tap water washing 4, the tap water washing 5 and the tap water washing 6 are the same as those of the tap water washing 3.
As a preferable scheme, the passivation solution in the passivation 1 and the passivation solution in the passivation 2 are formed by mixing an LF-032X4 trivalent chromium chemical passivator and water, and the LF-032X4 trivalent chromium chemical passivator in the two tanks accounts for 10-20% of the passivation solution; the temperatures during the passivation of the two tanks are as follows: the pH value of the passivating solution in the two tanks is 3.5-4.5 at the temperature of 20-35 ℃, and the Cr in the two tanks is3+The contents are as follows: 2.0 to 4.0 g/L.
As a preferred scheme, the conductivity of pure water in the pure water washing 1 is less than 150 mu s/cm, the pure water overflows when the pure water washing 1 works, and the washing time is 10-30 seconds; the conductivity of the pure water in the pure water wash 2 is less than 20 mus/cm, and the PH value of the pure water in the pure water wash 2: and 6-7, overflowing the pure water when the pure water washing 2 works, wherein the washing time is 10-30 seconds.
As a preferable scheme, the baking temperature setting at the time of drying is as follows: 110-120 ℃, and the baking time is not more than 15 minutes; and the time from the surface oxidation of the product to the drying is not more than 5 minutes.
As a preferable scheme, the step 9 and the following protection comprise the following steps:
9.1, removing burrs of the tooth hole, and removing burrs at the edge of the tooth hole by using an electric batch chamfering cutter;
9.2, trimming the edges, namely, grinding the residual powder on the edges of the two protective planes and the residual powder on the edges of the two prescription holes by using an air mill pen;
9.3, grinding the edge of the inner cavity, removing residual powder on the plane of the inner side of the sealing groove of the inner cavity surface by using a long air grinding pen, rotating a product, and blowing away the contaminated residues on the surface of the workpiece by using an air gun;
9.4, detecting the appearance, rotating the chassis base by 360 degrees, and checking that the surface of the product cannot have the bad conditions of dirt, foreign matters, deformation, bottom exposure, powder accumulation and burrs.
Preferably, the thickness of the sprayed film layer is 60 to 100 μm.
Compared with the prior art, the invention has obvious advantages and beneficial effects, and specifically, the technical scheme includes that:
through the surface cleaning and oxidizing treatment process, oil stains, dirt, dust and the like on the chassis base are cleaned, so that a stable conductive oxidation film is formed on the surface of the chassis base, the corrosion resistance of the chassis base is greatly improved, and the service life of a product is prolonged. Meanwhile, impurities and the like in the chassis base are further cleaned through tooth hole cleaning and lower protection processes, so that normal work of electronic components in the chassis base is guaranteed; the upper protection process is used for comprehensively protecting and covering the chassis base before spraying, so that the situation that the surface which is not sprayed is sprayed with paint is avoided, and defective products are reduced; after the spraying is finished, the powder on the protective workpiece is recycled, so that the resources are saved.
To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a diagram of the overall molding process steps of the present invention;
FIG. 2 is a diagram of the surface cleaning oxidation treatment process step of step 3 in the present invention;
FIG. 3 is a diagram of the step 8 spray coating process of the present invention;
FIG. 4 is a diagram of the protection process step at step 9 of the present invention.
Detailed Description
Referring to fig. 1 to 4, the specific steps of a 5G chassis base production molding process are as follows: the method comprises the following steps:
step 1, die-casting, namely die-casting the aluminum-magnesium alloy supplied material in a die-casting die to form the chassis base.
And 2, carrying out CNC machining, namely taking out the cooled chassis base from the die-casting die and putting the chassis base into a CNC machine tool for machining.
Step 3, surface cleaning and oxidation treatment, namely, installing the processed case base into an iron mesh frame, placing the case base in the iron mesh frame in an inclined mode, enabling cleaning bath solution to flow out conveniently, placing the framed case base into a cleaning oxidation line to perform surface cleaning and oxidation treatment, and comprising the following steps:
3.1, ultrasonic pre-degreasing, namely putting the processed chassis base into an ultrasonic pre-degreasing groove, and performing ultrasonic pre-degreasing on the chassis base by using environment-friendly degreasing liquid in the ultrasonic pre-degreasing groove under the action of ultrasonic waves to remove oil stains and dirt on the surface of a product;
3.2, ultrasonic main degreasing, namely putting the pre-degreased case base into an ultrasonic main degreasing tank, and carrying out ultrasonic main degreasing on the case base by using environment-friendly degreasing liquid in the ultrasonic main degreasing tank under the action of ultrasonic waves to remove an oxide film, oil stains and dirt on the surface of a product;
step 3.3, washing with tap water 1, namely putting the chassis base subjected to ultrasonic main degreasing into a first washing tank, and washing the product with tap water in the first washing tank to remove dirt;
step 3.4, washing with tap water 2, namely putting the chassis base washed in the tap water washing 1 into a second washing tank, and washing the product with tap water in the second washing tank to remove dirt;
step 3.5, activating, namely putting the chassis base which is washed in the tap water washing step 2 into an activation tank to react with an activation solution, removing surface oxides and organic matters, and roughening the surface;
step 3.6, washing with tap water 3, namely putting the chassis base subjected to the activation reaction into a third washing tank, and washing the product with tap water in the third washing tank to remove dirt;
step 3.7, washing with tap water 4, namely putting the chassis base washed in the tap water washing 3 into a fourth washing tank, and washing the product with tap water in the fourth washing tank to remove dirt;
step 3.8, pure water washing 1, namely, putting the chassis base which is washed in the tap water washing 4 into a first pure water tank, and washing the product by pure water in the first pure water tank to remove dirt;
step 3.9, passivating 1, namely putting the chassis base washed in the pure water washing 1 into a first passivating tank to react with passivating liquid, so that a conductive oxide film with good corrosion resistance is generated on the surface of the chassis base;
step 3.10, passivating 2, namely putting the chassis base passivated in the passivation 1 into a second passivation tank to react with passivation solution, so that a conductive oxide film with good corrosion resistance is further generated on the surface of the chassis base;
step 3.11, washing with tap water 5, namely putting the chassis base subjected to the passivation reaction into a fifth washing tank, and washing the product with the tap water in the fifth washing tank to remove dirt;
step 3.12, washing with tap water 6, namely putting the chassis base washed in the tap water washing 5 into a sixth washing tank, and washing the product with tap water in the sixth washing tank to remove dirt;
and 3.13, pure water washing 2, namely, putting the chassis base which is washed in the tap water washing 6 into a second pure water tank, and washing the product by pure water in the second pure water tank to remove dirt.
Step 4, drying, namely taking the chassis base with the surface cleaned and oxidized from the iron net frame, blowing scraps by a tool and blowing accumulated water in the deep part of the chassis base by an air gun, and avoiding water stain remained after drying; then the chassis base is placed into a drying line to dry the moisture on the chassis base; setting the baking temperature during drying: 110-120 ℃, and the baking time is not more than 15 minutes; and the time from the surface oxidation of the product to the drying is not more than 5 minutes.
And 5, cleaning impurities in the tooth holes, taking down the dried case base, slightly throwing the case base with the inner cavity surface facing downwards on the workbench for 2-3 times, and shaking off the impurities in the tooth holes.
Step 6, assembling, namely assembling spare and accessory parts on the chassis base, and carrying out airtight detection on the chassis base; and (3) placing the chassis base into an air tightness detection machine for air tightness detection, entering the next procedure for air tightness detection ok of the chassis base, and placing NO in a defective product for air tightness detection NO of the chassis base.
Step 7, protecting, namely pasting protective silica gel on the inner cavity surface of the chassis base, pasting protective adhesive paper on the light guide column position and the two end surface window positions, and plugging a thread protective rubber plug on the threaded hole; which is used to avoid spraying to these protected areas.
Step 8, spraying, namely hanging the chassis base in a spraying line, and spraying paint on the surface of the chassis base, wherein the method comprises the following steps:
8.1, feeding and filling a rubber plug, checking whether protective silica gel in an inner cavity of a product is in place or not, then checking whether the conductivity of a hook is good or not, after confirming that the product protection and the conductivity of the hook are OK, lightly taking the product to hang on the hook of the production line, then checking protection, and judging whether a leakage thread hole is protected or not and the tool is tilted, if leakage protection and tilting exist, using a thread rubber plug to fill leakage, and leveling the tool tilting position again;
8.2, spraying powder by a manipulator, wherein the assembly line drives the chassis base to operate, and the manipulator sprays powder to the chassis base according to set parameters; a spraying film layer is formed on the surface of the chassis base, and the thickness of the spraying film layer is between 60 and 100 mu m.
8.3, removing protection and solidification, after powder spraying is finished, firstly removing rubber plugs protected by threaded holes of products, sequentially placing the rubber plugs into a specified rubber frame in a classified mode, and placing the rubber plugs into a dust recovery system after a certain amount of rubber plugs are collected to blow off surface dust; then, tearing off protective gummed paper at the position of the light guide column and the positions of the windows on the two end faces, completely tearing off the gummed paper, and blowing away flying powder in the inner cavity by using an air gun; then, the product enters a baking area, and the sprayed powder is cured at the baking temperature of 200 +/-5 ℃; after the product is baked and taken out of the oven, the residual protective gummed paper and the rubber plug are taken down and put into a specified recovery frame; the recovery of dust and protective gummed paper is beneficial to environmental protection and can be reused.
Step 8.4, blanking, namely taking the products off the hooks of the assembly line one by one; and is placed on the pallet neatly.
Step 9, performing lower protection, namely performing lower protection treatment on the sprayed chassis base; the method comprises the following steps:
9.1, removing burrs of the tooth hole, and removing burrs at the edge of the tooth hole by using an electric batch chamfering cutter;
9.2, trimming the edges, namely, grinding the residual powder on the edges of the two protective planes and the residual powder on the edges of the two prescription holes by using an air mill pen;
9.3, grinding the edge of the inner cavity, removing residual powder on the plane of the inner side of the sealing groove of the inner cavity surface by using a long air grinding pen, rotating a product, and blowing away residues on the surface of the workpiece by using an air gun;
9.4, detecting the appearance, rotating the chassis base by 360 degrees, and checking that the surface of the product cannot have the bad conditions of dirt, foreign matters, deformation, bottom exposure, powder accumulation and burrs.
And step 10, packaging, namely packaging the processed chassis base.
The environment-friendly degreasing agent in the ultrasonic pre-degreasing tank is formed by mixing an LF-031K18 environment-friendly degreasing agent and water, wherein the LF-031K18 environment-friendly degreasing agent accounts for 5-10% of the environment-friendly degreasing agent, the alkalinity can be increased by 1PT by adding 3-5kg of the degreasing agent per 1000kg of tank liquid, and the neutral degreasing agent is added once per day in normal times or according to test results. The total alkalinity of the environment-friendly degreasing fluid is as follows: 10-20, working temperature: 55. + -. 10 ℃ pH: 10-12, working time of ultrasonic main degreasing: 6-8 min. And the formula of the environment-friendly degreasing fluid in the ultrasonic main degreasing tank is the same as that of the environment-friendly degreasing fluid in the ultrasonic pre-degreasing tank, and the working time, the pH value and the working temperature are the same. The environment-friendly degreasing liquid is matched with ultrasonic waves to perform degreasing treatment twice on the surface of the chassis base, pre-degreasing is performed for the first time, stains and the like on the surface of the chassis base are cleaned, main degreasing is performed for the second time, and the stains on the surface of the chassis base are cleaned more thoroughly.
PH of tap water in the tap water wash 1 and the tap water wash 2: 7-9, running water overflows when the two tanks work, namely water circulation, and the water washing time is as follows: 10-30 seconds. The chassis base is cleaned by alkalescent water to remove dirt attached to the chassis base, and the dirt on the chassis base is greatly cleaned by two times of weak alkaline water cleaning.
The activating liquid in the activating groove is formed by mixing an LF-029P2 activating agent and water, and the LF-029P2 activating agent accounts for 5-10% of the activating liquid. pH of the activating solution: 0.5-2, total acidity: 10-25, activation reaction working time: 0.5-1 min. The activating solution plays a role in alkaline catalytic oxidation and surface activity, and can be used as a cleaning agent in the reaction process to wash toxic substances such as colloid, sodium phenolate and the like adsorbed on the surface of the chassis base.
PH of tap water in the tap water wash 3: 5-7, running water overflows when the washing machine works, and the washing time is as follows: 10-30 seconds; and the pH value, the working principle and the water washing time of tap water in the tap water washing 4, the tap water washing 5 and the tap water washing 6 are the same as those of the tap water washing 3. It is different from the weak alkaline water of tap water 1 and tap water 2, and carries out neutralization reaction.
The passivation solution in the passivation 1 and the passivation solution in the passivation 2 are formed by mixing an LF-032X4 trivalent chromium chemical passivator and water, and the LF-032X4 trivalent chromium chemical passivator in the two grooves accounts for 10-20% of the passivation solution; the temperatures during the passivation of the two tanks are as follows: the pH value of the passivating solution in the two tanks is 3.5-4.5 at the temperature of 20-35 ℃, and the Cr in the two tanks is3+The contents are as follows: 2.0 to 4.0 g/L. After two times of passivation, a passivation film (conductive oxide film) is carried out on the surface of the chassis base, so that the chassis base basically stops dissolving to form a passive state to achieve the anti-corrosion effect.
The conductivity of the pure water in the pure water washing 1 is less than 150 mus/cm, the pure water overflows when the pure water washing 1 works, and the washing time is 10-30 seconds. The conductivity of the pure water in the pure water wash 2 is less than 20 mus/cm, and the PH value of the pure water in the pure water wash 2: and 6-7, overflowing the pure water when the pure water washing 2 works, wherein the washing time is 10-30 seconds.
The design of the invention is characterized in that: through the surface cleaning and oxidizing treatment process, oil stains, dirt, dust and the like on the chassis base are cleaned, so that a stable conductive oxidation film is formed on the surface of the chassis base, the corrosion resistance of the chassis base is greatly improved, and the service life of a product is prolonged. Meanwhile, impurities and the like in the chassis base are further cleaned through tooth hole cleaning and lower protection processes, so that normal work of electronic components in the chassis base is guaranteed; the upper protection process is used for comprehensively protecting and covering the chassis base before spraying, so that the situation that the surface which is not sprayed is sprayed with paint is avoided, and defective products are reduced; after the spraying is finished, the powder on the protective workpiece is recycled, so that the resources are saved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the technical scope of the present invention.
Claims (8)
1. A5G case base production molding process is characterized in that: the method comprises the following steps:
step 1, die-casting, namely die-casting an aluminum magnesium alloy incoming material in a die-casting die to form a chassis base;
step 2, CNC machining, namely taking the cooled chassis base out of the die-casting die and putting the chassis base into a CNC machine tool for machining;
step 3, surface cleaning and oxidation treatment, namely, installing the processed case base into an iron mesh frame, placing the case base in the iron mesh frame in an inclined mode, enabling cleaning bath solution to flow out conveniently, placing the framed case base into a cleaning oxidation line to perform surface cleaning and oxidation treatment, and comprising the following steps:
3.1, ultrasonic pre-degreasing, namely putting the processed chassis base into an ultrasonic pre-degreasing groove, and performing ultrasonic pre-degreasing on the chassis base by using environment-friendly degreasing liquid in the ultrasonic pre-degreasing groove under the action of ultrasonic waves to remove oil stains and dirt on the surface of a product;
3.2, ultrasonic main degreasing, namely putting the pre-degreased case base into an ultrasonic main degreasing tank, and carrying out ultrasonic main degreasing on the case base by using environment-friendly degreasing liquid in the ultrasonic main degreasing tank under the action of ultrasonic waves to remove an oxide film, oil stains and dirt on the surface of a product;
step 3.3, washing with tap water 1, namely putting the chassis base subjected to ultrasonic main degreasing into a first washing tank, and washing the product with tap water in the first washing tank to remove dirt;
step 3.4, washing with tap water 2, namely putting the chassis base washed in the tap water washing 1 into a second washing tank, and washing the product with tap water in the second washing tank to remove dirt;
step 3.5, activating, namely putting the chassis base which is washed in the tap water washing step 2 into an activation tank to react with an activation solution, removing surface oxides and organic matters, and roughening the surface; the activation liquid in the activation tank is formed by mixing an LF-029P2 activator and water, and the LF-029P2 activator accounts for 5-10% of the activation liquid; pH of the activating solution: 0.5-2, total acidity: 10-25, activation reaction working time: 0.5-1 min;
step 3.6, washing with tap water 3, namely putting the chassis base subjected to the activation reaction into a third washing tank, and washing the product with tap water in the third washing tank to remove dirt;
step 3.7, washing with tap water 4, namely putting the chassis base washed in the tap water washing 3 into a fourth washing tank, and washing the product with tap water in the fourth washing tank to remove dirt;
step 3.8, pure water washing 1, namely, putting the chassis base which is washed in the tap water washing 4 into a first pure water tank, and washing the product by pure water in the first pure water tank to remove dirt;
step 3.9, passivating 1, namely putting the chassis base washed in the pure water washing 1 into a first passivating tank to react with passivating liquid, so that a conductive oxide film with good corrosion resistance is generated on the surface of the chassis base;
step 3.10, passivating 2, namely putting the chassis base passivated in the passivation 1 into a second passivation tank to react with passivation solution, so that a conductive oxide film with good corrosion resistance is further generated on the surface of the chassis base;
step 3.11, washing with tap water 5, namely putting the chassis base subjected to the passivation reaction into a fifth washing tank, and washing the product with the tap water in the fifth washing tank to remove dirt;
step 3.12, washing with tap water 6, namely putting the chassis base washed in the tap water washing 5 into a sixth washing tank, and washing the product with tap water in the sixth washing tank to remove dirt;
step 3.13, pure water washing 2, namely, putting the chassis base washed in the tap water washing 6 into a second pure water tank, and washing the product by pure water in the second pure water tank to remove dirt;
step 4, drying, namely taking the chassis base with the surface cleaned and oxidized from the iron net frame, blowing scraps by a tool and blowing accumulated water in the deep part of the chassis base by an air gun, and avoiding water stain remained after drying; then the chassis base is placed into a drying line to dry the moisture on the chassis base;
step 5, cleaning impurities in the tooth holes, taking down the dried chassis base, slightly throwing the chassis base with the inner cavity surface facing downwards on a workbench for 2-3 times, and shaking off the impurities in the tooth holes;
step 6, assembling, namely assembling spare and accessory parts on the chassis base, and carrying out airtight detection on the chassis base;
step 7, protecting, namely pasting protective silica gel on the inner cavity surface of the chassis base, pasting protective adhesive paper on the light guide column position and the two end surface window positions, and plugging a thread protective rubber plug on the threaded hole; it is used to avoid spraying to these protected places;
step 8, spraying, namely hanging the chassis base in a spraying line, and spraying paint on the surface of the chassis base, wherein the method comprises the following steps:
8.1, feeding and filling a rubber plug, checking whether protective silica gel in an inner cavity of a product is in place or not, then checking whether the conductivity of a hook is good or not, after confirming that the product protection and the conductivity of the hook are OK, lightly taking the product to hang on the hook of the production line, then checking protection, and judging whether a leakage thread hole is protected or not and the tool is tilted, if leakage protection and tilting exist, using a thread rubber plug to fill leakage, and leveling the tool tilting position again;
8.2, spraying powder by a manipulator, wherein the assembly line drives the chassis base to operate, the manipulator sprays powder to the chassis base according to set parameters, and a spraying film layer is formed on the surface of the chassis base;
8.3, removing protection and solidification, after powder spraying is finished, firstly removing rubber plugs protected by threaded holes of products, sequentially placing the rubber plugs into a specified rubber frame in a classified mode, and placing the rubber plugs into a dust recovery system after a certain amount of rubber plugs are collected to blow off surface dust; then, tearing off protective gummed paper at the position of the light guide column and the positions of the windows on the two end faces, completely tearing off the gummed paper, and blowing away the flying powder in the inner cavity by using an air gun; then, the product enters a baking area, the sprayed powder is solidified, and after the product is baked and taken out of the oven, the residual protective gummed paper and the rubber plug are taken down and placed in a specified recovery frame;
step 8.4, blanking, namely taking the products off the hooks of the assembly line one by one; and is placed on the pallet regularly;
step 9, performing lower protection, namely performing lower protection treatment on the sprayed chassis base; the step 9 of protection comprises the following steps:
9.1, removing burrs of the tooth hole, and removing burrs at the edge of the tooth hole by using an electric batch chamfering cutter;
9.2, trimming the edges, namely, grinding the residual powder on the edges of the two protective planes and the residual powder on the edges of the two prescription holes by using an air mill pen;
9.3, grinding the edge of the inner cavity, removing residual powder on the plane of the inner side of the sealing groove of the inner cavity surface by using a long air grinding pen, rotating a product, and blowing away the contaminated residues on the surface of the workpiece by using an air gun;
9.4, detecting the appearance, rotating the chassis base by 360 degrees, and checking that the surface of the product cannot have the bad conditions of dirt, foreign matters, deformation, bottom exposure, powder accumulation and burrs;
and step 10, packaging, namely packaging the processed chassis base.
2. The 5G case base production molding process according to claim 1, wherein: the environment-friendly degreasing agent in the ultrasonic pre-degreasing tank is formed by mixing an LF-031K18 environment-friendly degreasing agent and water, and the LF-031K18 environment-friendly degreasing agent accounts for 5-10% of the environment-friendly degreasing agent; the total alkalinity of the environment-friendly degreasing fluid is as follows: 10-20, working temperature: 55. + -. 10 ℃ pH: 10-12, working time of ultrasonic main degreasing: 6-8 min; and the formula of the environment-friendly degreasing fluid in the ultrasonic main degreasing tank is the same as that of the environment-friendly degreasing fluid in the ultrasonic pre-degreasing tank, and the working time, the pH value and the working temperature are the same.
3. The 5G case base production molding process according to claim 1, wherein: PH of tap water in the tap water wash 1 and the tap water wash 2: 7-9, running water overflows when the two tanks work, and the washing time is as follows: 10-30 seconds.
4. The 5G case base production molding process according to claim 1, wherein: PH of tap water in the tap water wash 3: 5-7, running water overflows when the washing machine works, and the washing time is as follows: 10-30 seconds; and the pH value, the working principle and the water washing time of tap water in the tap water washing 4, the tap water washing 5 and the tap water washing 6 are the same as those of the tap water washing 3.
5. The 5G case base production molding process according to claim 1, wherein: the bluntThe passivation solution in the passivation solution 1 and the passivation solution in the passivation solution 2 are formed by mixing an LF-032X4 trivalent chromium chemical passivator and water, and the LF-032X4 trivalent chromium chemical passivator in the two tanks accounts for 10-20% of the passivation solution; the temperatures during the passivation of the two tanks are as follows: the pH value of the passivating solution in the two tanks is 3.5-4.5 at the temperature of 20-35 ℃, and the Cr in the two tanks is3+The contents are as follows: 2.0 to 4.0 g/L.
6. The 5G case base production molding process according to claim 1, wherein: the conductivity of the pure water in the pure water washing 1 is less than 150 mu s/cm, the pure water overflows when the pure water washing 1 works, and the washing time is 10-30 seconds; the conductivity of pure water in pure water wash 2 is less than 20 μ s/cm, and the pH value of pure water in pure water wash 2 is: and 6-7, overflowing the pure water when the pure water washing 2 works, wherein the washing time is 10-30 seconds.
7. The 5G case base production molding process according to claim 1, wherein: and setting the baking temperature during drying: 110-120 ℃, and the baking time is not more than 15 minutes; and the time from the surface oxidation of the product to the drying is not more than 5 minutes.
8. The 5G case base production molding process according to claim 1, wherein: the thickness of the spraying film layer is 60-100 mu m.
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| JP3653460B2 (en) * | 2000-10-26 | 2005-05-25 | 三洋電機株式会社 | Semiconductor module and manufacturing method thereof |
| KR101167476B1 (en) * | 2007-11-19 | 2012-07-27 | 니혼 파커라이징 가부시키가이샤 | Base processing agent for metal material and method for processing base for metal material |
| CN101643300B (en) * | 2009-09-01 | 2012-01-04 | 浙江大学 | Treatment method of comprehensive waste water of metal processing |
| CN105522280B (en) * | 2014-12-26 | 2017-06-06 | 比亚迪股份有限公司 | A kind of preparation method of communication apparatus metal shell |
| CN204490999U (en) * | 2015-03-23 | 2015-07-22 | 遂宁市联胜金属表面处理有限公司 | A kind of ultrasonic degreaser |
| CN104826779A (en) * | 2015-05-29 | 2015-08-12 | 吉祥铝业（长兴）有限公司 | Sectional material spraying technology |
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| CN106086418B (en) * | 2016-06-30 | 2017-12-29 | 江西省钨与稀土产品质量监督检验中心（江西省钨与稀土研究院） | A kind of method that waste and old device performance of sintered NdFeB recovers |
| CN107335595A (en) * | 2017-06-27 | 2017-11-10 | 昆山特酷信息科技有限公司 | A kind of spraying coating process of Novel chassis shell |
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| CN109797419B (en) * | 2019-04-01 | 2021-05-18 | 铭帝集团有限公司 | High-gloss corrosion-resistant treatment process for surface of aluminum alloy profile |
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