CN112188820B - Shielding shell production forming process - Google Patents
Shielding shell production forming process Download PDFInfo
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- CN112188820B CN112188820B CN202011083607.2A CN202011083607A CN112188820B CN 112188820 B CN112188820 B CN 112188820B CN 202011083607 A CN202011083607 A CN 202011083607A CN 112188820 B CN112188820 B CN 112188820B
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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
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C13/00—Means for manipulating or holding work, e.g. for separate articles
- B05C13/02—Means for manipulating or holding work, e.g. for separate articles for particular articles
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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
- B05D1/26—Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
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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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- 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
- C23C22/78—Pretreatment of the material to be coated
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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
- C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
- C23C2222/10—Use of solutions containing trivalent chromium but free of hexavalent chromium
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Cleaning By Liquid Or Steam (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
The invention discloses a shielding shell production forming process, which comprises the following steps of 1, die casting; 2. CNC processing, 3, surface cleaning and oxidation treatment; 4. drying, 5, dispensing, namely placing the dried shielding shell on a positioning tool of a dispenser for positioning, and after the shielding shell is positioned on the positioning tool, dispensing nickel carbon glue on the top surfaces of the first ribs, the top surfaces of the second ribs and the periphery of the inner end of the counter bore by a dispensing hand in the dispenser to form a shielding glue layer; 6. and (7) drying the glue, and packaging. Through the top surface of first muscle rib on the shielding shell, the top surface of second muscle rib and the inner periphery upper point nickel carbon glue of counter bore be formed with the shielding glue film, when avoiding shielding shell and radiating seat equipment, the signal spills from the clearance between the two, further reinforcing shielding effect. And adopt the vacuum to inhale the fixed shielding lid of location work piece, appear rocking or offset when avoiding gluing, simultaneously, the rigid fixed mode that supports of traditional cylinder avoids the shielding shell to be damaged by the pressure.
Description
Technical Field
The invention relates to the technical field of production processes of shielding shells, in particular to a production forming process of a shielding shell.
Background
With the advent of the 5G era, shielding cases are applied to many chassis for shielding and protecting signals.
However, the conventional shielding shell has poor shielding performance, and signals are easy to leak out of the gap between the shielding shell and the heat sink. And when the shielding shell is machined, the shielding shell is fixed in a mode of cylinder hard pressing, so that the shielding shell can be damaged by pressing, and defective products are caused.
Meanwhile, in the oxidation process of the molding surface of the shielding shell, the conductive oxide film formed on the surface of the shielding shell is unstable due to incomplete cleaning and dissolution of stains on the surface of the shielding shell, so that the surface of the shielding shell can be corroded.
Disclosure of Invention
In view of the above, the present invention is directed to the defects in the prior art, and the main object of the present invention is to provide a process for producing and forming a shielding shell, which effectively solves the problem of poor shielding performance and the problem of unstable conductive oxide film on the surface of the shielding shell.
In order to achieve the purpose, the invention adopts the following technical scheme:
a production and forming process of a shielding shell 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 shielding shell;
the top surface of the shielding shell is provided with a plurality of transversely arranged first ribs and a plurality of longitudinally arranged second ribs, counter bores for locking screws penetrate through the intersection positions of the plurality of first ribs and the plurality of second ribs, and a plurality of shielding spaces are formed between the plurality of first ribs and the plurality of second ribs;
step 2, CNC machining, namely taking the cooled shielding shell out of the die-casting die and putting the shielding shell into a CNC machine tool for machining;
step 3, surface cleaning and oxidation treatment, namely surface cleaning and oxidation treatment is carried out on the processed shielding shell;
step 4, drying, namely putting the shielding shell with the oxidized surface into a dryer to dry the moisture on the shielding shell;
step 5, dispensing, namely placing the dried shielding shell on a positioning tool of a dispensing machine for positioning, and after the shielding shell is positioned on the positioning tool, dispensing nickel carbon glue on the top surfaces of the first ribs, the top surfaces of the second ribs and the periphery of the inner end of the counter bore by a dispensing hand in the dispensing machine to form a shielding glue layer; when the shielding shell and the heat dissipation seat are assembled, signals are prevented from leaking from a gap between the shielding shell and the heat dissipation seat;
the positioning tool comprises a bottom plate, a positioning plate, a first vacuum suction mechanism, a second vacuum suction mechanism and a third vacuum suction mechanism; the bottom plate is hermetically attached to the positioning plate; the bottom surface of the positioning plate is concavely provided with an air passage, and the top surface of the positioning plate is provided with a positioning column; the first vacuum suction mechanism and the second vacuum suction mechanism are respectively arranged at two ends of the top surface of the positioning plate; the third vacuum suction mechanism is arranged in the middle of the top surface of the positioning plate, and the first vacuum suction mechanism, the second vacuum suction mechanism and the third vacuum suction mechanism are communicated with the air passage; the shielding shell is placed on the first vacuum suction mechanism, the second vacuum suction mechanism and the third vacuum suction mechanism and is tightly adsorbed and fixed on the shielding shell;
step 6, drying the glue, namely putting the screened shell subjected to glue dispensing into a glue drying machine to dry the screened glue, taking down the screened shell after drying, and trimming the glue threads;
and 7, packaging, namely packaging the processed shielding shell.
As a preferable scheme, the step 3, the surface cleaning oxidation treatment, comprises the following steps:
3.1, ultrasonic pre-degreasing, namely putting the processed shielding shell into an ultrasonic pre-degreasing groove, and carrying out ultrasonic pre-degreasing on the shielding shell 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 shield shell subjected to pre-degreasing into an ultrasonic main degreasing tank, and carrying out ultrasonic main degreasing on the shield shell 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;
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: 6-8min; 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;
step 3.3, washing with tap water 1, namely putting the shielding shell subjected to the ultrasonic main degreasing into a first washing tank, and washing the product with the tap water in the first washing tank to remove dirt;
step 3.4, washing with tap water 2, namely putting the shielding shell washed in the tap water washing 1 into a second washing tank, and washing the product with the tap water in the second washing tank to remove dirt;
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;
step 3.5, activating, namely putting the shielding shell 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 activating agent and water, and the LF-029P2 activating agent accounts for 5-10% of the activation liquid; pH of the activating solution: 0.5-2, total acidity: 10-25, activation reaction working time: 0.5-1min;
step 3.6, washing with tap water 3, namely putting the shielding shell 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;
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, working principle and water washing time of tap water in tap water washing 4, tap water washing 5 and tap water washing 6 in the following steps are the same as those of tap water washing 3;
step 3.7, washing with tap water 4, namely putting the shielding shell washed in the tap water washing step 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 shielding shell which is washed by 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;
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;
step 3.9, passivating 1, namely putting the shielding shell which is 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 shielding shell;
step 3.10, passivating 2, placing the shielding shell passivated in the passivation 1 into a second passivation tank to react with passivation solution, and further generating a conductive oxide film with good corrosion resistance on the surface of the shielding shell;
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 Cr in the two tanks 3+ The contents are as follows: 2.0-4.0 g/L;
step 3.11, washing with tap water 5, namely putting the shielding shell 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 shielding shell washed in the tap water 5 into a sixth washing tank, and washing the product with the tap water in the sixth washing tank to remove dirt;
step 3.13, pure water washing 2, namely, putting the shielding shell which is washed by the tap water washing 6 into a second pure water tank, and washing the product by the pure water in the second pure water tank to remove dirt;
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 is as follows: 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: baking at 110-120 deg.C for no more than 15 min; and the time from the surface oxidation of the product to the drying is not more than 5 minutes.
As a preferred scheme, a plurality of shielding shells are framed and used for transporting and transferring the sequence, and the two adjacent shielding shells are mutually isolated by a metal net, so that poor contact caused by superposition of the working surfaces of the shielding shells is avoided.
As a preferred scheme, the oxidized shielding shell needs to be isolated by a protective material, so that an oxide layer is prevented from being scratched; the periphery is shielded by a stretching film during the sequence conversion, so that secondary pollution is prevented, and the oxidized product is forbidden to directly contact the ground when being placed.
Preferably, the first vacuum suction mechanism comprises a suction screw and an elastically deformable vacuum chuck, the suction screw is mounted on the positioning plate, an air hole penetrates through the upper surface and the lower surface of the suction screw, and the lower end of the air hole is communicated with the air passage; the vacuum chuck is arranged at the upper end of the air suction screw, and the suction hole on the vacuum chuck is communicated with the upper end of the air hole.
Preferably, the second vacuum suction mechanism and the third vacuum suction mechanism are the same as the first vacuum suction mechanism in structure.
As a preferred scheme, the number of the first vacuum suction mechanisms is 10, and the 10 first vacuum suction mechanisms are arranged on the positioning plate through a base plate; the number of the second vacuum suction mechanisms is 5, and the 5 second vacuum suction mechanisms are arranged on the positioning plate at intervals; the number of the third vacuum suction mechanisms is 18, and the 18 third vacuum suction mechanisms are arranged in a row.
As a preferable scheme, the third vacuum suction mechanism is arranged on the positioning plate through a base plate, the upper surface of the base plate is convexly provided with a mounting column, and a through hole penetrates through the upper surface and the lower surface of the mounting column and is communicated with the air passage; and an air suction screw in the third vacuum suction mechanism is arranged on the through hole and is communicated with the through hole.
As a preferable scheme, a plurality of contour columns for supporting the shielding cover are fixed on the positioning plate, and the contour columns are arranged on the positioning plate at intervals.
Compared with the prior art, the invention has obvious advantages and beneficial effects, and specifically, the technical scheme includes that:
1. a plurality of first ribs which are transversely arranged and a plurality of second ribs which are longitudinally arranged are formed on the shielding shell, counter bores for locking screws penetrate through the intersection positions of the plurality of first ribs and the plurality of second ribs, a plurality of shielding spaces are formed between the plurality of first ribs and the plurality of second ribs, and the electronic component extends into the shielding spaces to play a role in shielding signals; meanwhile, a shielding glue layer is formed on the top surfaces of the first ribs, the top surfaces of the second ribs and the periphery of the inner end of the counter bore, so that when the shielding shell is assembled with the heat dissipation seat, signals leak out from gaps between the shielding shell and the heat dissipation seat, and the shielding effect is further enhanced. And adopt the vacuum to inhale the fixed shielding lid of location work piece, appear rocking or offset when avoiding gluing, simultaneously, the rigid fixed mode that supports of traditional cylinder avoids the shielding shell to be damaged by the pressure.
2. When the shielding shell surface cleaning oxidation treatment, through ultrasonic wave pre-degreasing, ultrasonic wave owner's degrease, tap water washing 1, tap water washing 2, the activation, tap water washing 3, tap water washing 4, pure water washing 1, passivation 2, tap water washing 5, tap water washing 6 and pure water washing 2, through these thirteen steps, the dirty stain clearance on shielding shell surface is thorough, thereby form stable electrically conductive oxide film, make the corrosion resistance of shielding shell promote greatly, the life of product has been improved.
In order to more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a diagram of the steps of the forming process of the present invention;
FIG. 2 is a diagram illustrating a step of the surface cleaning oxidation treatment process according to the present invention;
FIG. 3 is a partial view of the shield case of the present invention;
FIG. 4 is a perspective view of the positioning tool of the present invention;
FIG. 5 is an exploded view of the positioning tool of the present invention;
FIG. 6 is a perspective view of a positioning plate in the positioning tool of the present invention;
fig. 7 is a partially exploded view of the positioning tool of the present invention.
Detailed Description
Referring to fig. 1 to 2, a flow chart of the forming process of the present invention is shown, which includes the following steps:
step 1, die-casting, namely die-casting an aluminum magnesium alloy incoming material in a die-casting die to form a shielding shell 10;
as shown in fig. 3, the top surface of the shielding shell 10 has a plurality of first ribs 11 arranged transversely and a plurality of second ribs 12 arranged longitudinally, a counter bore 13 for locking a screw penetrates through the intersection of the plurality of first ribs 11 and the plurality of second ribs 12, and a plurality of shielding spaces 101 are formed between the plurality of first ribs 11 and the plurality of second ribs 12;
step 2, CNC machining, namely taking the cooled shielding shell 10 out of the die-casting die and putting the cooled shielding shell into a CNC machine tool for machining;
step 3, surface cleaning and oxidation treatment, namely performing surface cleaning and oxidation treatment on the processed shielding shell 10, wherein the surface cleaning and oxidation treatment comprises the following steps:
3.1, ultrasonic pre-degreasing, namely putting the processed shielding shell 10 into an ultrasonic pre-degreasing groove, and carrying out ultrasonic pre-degreasing on the shielding shell 10 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, carrying out ultrasonic main degreasing, namely putting the shield shell 10 subjected to pre-degreasing into an ultrasonic main degreasing tank, and carrying out ultrasonic main degreasing on the shield shell 10 by using an environment-friendly degreasing solution 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 shielding shell 10 subjected to the ultrasonic main degreasing into a first washing tank, and washing the product with the tap water in the first washing tank to remove dirt;
step 3.4, washing with tap water 2, namely putting the shielding shell 10 which is washed in the tap water washing 1 into a second washing tank, and washing the product with the tap water in the second washing tank to remove dirt;
step 3.5, activation, namely putting the shielding shell 10 which is washed in the tap water washing 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 shielding shell 10 subjected to the activation reaction into a third washing tank, and washing the product with the tap water in the third washing tank to remove dirt;
step 3.7, washing with tap water 4, namely putting the shielding shell 10 washed in the tap water 3 into a fourth washing tank, and washing the product with the tap water in the fourth washing tank to remove dirt;
step 3.8, pure water washing 1, namely, putting the shielding shell 10 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 shielding shell 10 which is washed in the pure water washing 1 into a first passivating tank to react with passivating solution, so that a conductive oxide film with good corrosion resistance is generated on the surface of the shielding shell 10;
step 3.10, passivating 2, putting the shielding shell 10 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 shielding shell 10;
step 3.11, washing with tap water 5, namely putting the shielding shell 10 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 shielding shell 10 washed in the tap water 5 into a sixth washing tank, and washing the product with the tap water in the sixth washing tank to remove dirt;
step 3.13, pure water washing 2, namely, putting the shielding shell 10 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 putting the shielding shell 10 with the oxidized surface into a dryer to dry the moisture on the shielding shell 10;
step 5, dispensing, namely placing the dried shielding shell 10 on a positioning tool 20 of a dispenser for positioning, and after the shielding shell 10 is positioned on the positioning tool 20, dispensing nickel-carbon glue on the top surface of the first rib 11, the top surface of the second rib 12 and the periphery of the inner end of the counter bore 13 by a dispensing hand in the dispenser to form a shielding glue layer (not shown in the drawing); the signal is prevented from leaking from the gap between the shielding shell 10 and the heat sink when the shielding shell is assembled with the heat sink;
as shown in fig. 4-7, the positioning tool 20 includes a bottom plate 21, a positioning plate 22, a first vacuum suction mechanism 23, a second vacuum suction mechanism 24, and a third vacuum suction mechanism 25; the bottom plate 21 is hermetically attached to the positioning plate 22; an air passage 221 is concavely arranged on the bottom surface of the positioning plate 22, and a positioning column 26 is arranged on the top surface of the positioning plate 22; the first vacuum suction mechanism 23 and the second vacuum suction mechanism 24 are respectively arranged at two ends of the top surface of the positioning plate 22; the third vacuum suction mechanism 25 is disposed at the center of the top surface of the positioning plate 22, and the first vacuum suction mechanism 23, the second vacuum suction mechanism 24 and the third vacuum suction mechanism 25 are all communicated with the air channel 221; the shielding case 10 is placed on the first vacuum suction mechanism 23, the second vacuum suction mechanism 24 and the third vacuum suction mechanism 25 and is tightly adsorbed and fixed to the shielding case 10; an air extractor in the dispenser extracts air, so that the first vacuum suction mechanism 23, the second vacuum suction mechanism 24 and the third vacuum suction mechanism 25 suck air to generate negative pressure, the shielding cover 10 is tightly adsorbed on the tooling, the phenomenon of shaking or position deviation in dispensing is avoided, and meanwhile, compared with a traditional air cylinder rigid pressing and fixing mode, the shielding shell 10 is prevented from being crushed;
step 6, drying glue, namely putting the product subjected to glue dispensing into a glue drying machine to dry the shielding glue 10, taking down the product after drying, and trimming glue threads;
and 7, packaging, namely packaging and delivering the processed shielding shell 10.
The environment-friendly degreasing agent in the ultrasonic pre-degreasing tank is formed by mixing an LF-031K18 environment-friendly degreasing agent and water, the LF-031K18 environment-friendly degreasing agent accounts for 5-10% of the environment-friendly degreasing agent, the alkalinity can be increased by 1PT when 3-5kg of the degreasing agent is supplemented, and a neutral degreasing agent is supplemented every day in normal times or according to a test result. 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: 6-8min. 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 shielding shell, pre-degreasing is performed for the first time, stains and the like on the surface of the shielding shell are cleaned, degreasing is performed for the second time, and the stains on the surface of the shielding shell are cleaned more thoroughly.
PH of tap water in the tap water washing 1 and the tap water washing 2: 7-9, running water overflows when the two tanks work, namely water circulation, and the water washing time is as follows: 10 to 30 seconds. The shielding shell is cleaned by alkalescent water to remove dirt attached to the shielding shell, and the dirt on the shielding shell is greatly cleaned by two times of weak alkaline water cleaning.
The activating solution in the activating tank is formed by mixing an LF-029P2 activating agent and water, and the LF-029P2 activating agent accounts for 5-10% of the activating solution. pH of the activating solution: 0.5-2, total acidity: 10-25, activation reaction working time: 0.5-1min. 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 away toxic materials such as colloid, sodium phenolate and the like adsorbed on the surface of the shielding shell.
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 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 Cr in the two tanks 3+ The contents are as follows: 2.0-4.0 g/L. After two times of passivation, a passivation film (conductive oxide film) is carried out on the surface of the shielding shell, so that the shielding shell basically stops dissolving to form a passive state to achieve the effect of corrosion prevention.
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 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: 6-7, overflowing the pure water when the pure water washing 2 works, wherein the washing time is 10-30 seconds.
Setting the baking temperature during drying: baking at 110-120 deg.C for no more than 15 min; and the time from the surface oxidation of the product to the drying is not more than 5 minutes. A plurality of shielding shell dress frames are used for transporting and change the preface, and keep apart each other with the metal mesh between the two adjacent shielding shells, avoid the shielding shell worker face coincide to cause contact failure. Meanwhile, the oxidized shielding shell needs to be isolated by a protective material, so that an oxide layer is prevented from being scratched; the periphery is shielded by a stretching film during the process of transferring, so that secondary pollution is prevented, and the oxidized product is forbidden to directly contact the ground when being placed.
And the incoming materials of the previous process are checked during each sequence conversion, whether the surface of the shielding shell has the defects that the subsequent processes cannot be removed due to serious scratch, bruise, large-head pen marks, residual glue, serious corrosion, serious deformation and the like is determined, and serious oil stains and residual glue (including label residual glue) are detected and are wiped by wiping with chopped cloth or a brush dipped with white gasoline and then treated. The shielding case with the protective film on the surface is required to check whether the residual protective film exists at the stamping and bending positions of the workpiece and clear the residual protective film.
The first vacuum suction mechanism 23 includes a suction screw 231 and an elastically deformable vacuum chuck 232, the suction screw 231 is mounted on the positioning plate 22, an air hole 201 penetrates through the upper and lower surfaces of the suction screw 231, and the lower end of the air hole 201 is communicated with the air passage 221; the vacuum chuck 232 is disposed at the upper end of the suction screw 231, and the suction hole of the vacuum chuck 232 is communicated with the upper end of the air hole 201. In the present embodiment, the second vacuum suction mechanism 24 and the third vacuum suction mechanism 25 are the same in structure as the first vacuum suction mechanism 21. And the number of the first vacuum suction mechanisms 23 is 10, and the 10 first vacuum suction mechanisms 23 are arranged on the positioning plate 22 through a backing plate 27. The number of the second vacuum suction mechanisms 24 is 5, and the 5 second vacuum suction mechanisms 24 are arranged on the positioning plate 22 at intervals. The number of the third vacuum suction mechanisms 25 is 18, the 18 third vacuum suction mechanisms 25 are arranged in a row, the third vacuum suction mechanisms 25 are arranged on the positioning plate 22 through a backing plate 28, the upper surface of the backing plate 28 is convexly provided with a mounting column 29, a through hole 291 penetrates through the upper surface and the lower surface of the mounting column 29, and the through hole 291 is communicated with the air passage 221; the suction screw of the third vacuum suction mechanism 25 is installed on the through hole 291 and communicates with the through hole 291. A plurality of equal-height columns 202 for supporting the shielding cover 10 are fixed on the positioning plate 22, and the equal-height columns 202 are arranged on the positioning plate 22 at intervals.
The design of the invention is characterized in that: firstly, a plurality of first ribs which are transversely arranged and a plurality of second ribs which are longitudinally arranged are formed on a shielding shell, counter bores for locking screws penetrate through the intersection positions of the plurality of first ribs and the plurality of second ribs, a plurality of shielding spaces are formed between the plurality of first ribs and the plurality of second ribs, and electronic components extend into the shielding spaces to play a role in shielding signals; meanwhile, a shielding glue layer is formed on the top surfaces of the first ribs, the top surfaces of the second ribs and the periphery of the inner end of the counter bore, so that when the shielding shell is assembled with the heat dissipation seat, signals leak out from gaps between the shielding shell and the heat dissipation seat, and the shielding effect is further enhanced. And adopt the vacuum to inhale the fixed shielding lid of location work piece, appear rocking or offset when avoiding gluing, simultaneously, the rigid fixed mode that supports of traditional cylinder avoids the shielding shell to be damaged by the pressure. Secondly, when the surface of the shielding shell is cleaned and oxidized, the surface of the shielding shell is subjected to ultrasonic pre-degreasing, ultrasonic main degreasing, tap water washing 1, tap water washing 2, activation, tap water washing 3, tap water washing 4, pure water washing 1, passivation 2, tap water washing 5, tap water washing 6 and pure water washing 2, and through the thirteen steps, the dirt on the surface of the shielding shell is thoroughly cleaned, so that a stable conductive oxide film is formed, the corrosion resistance of the shielding shell is greatly improved, and the service life of a product is prolonged.
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 (7)
1. A production and forming process of a shielding shell is characterized in that: the method comprises the following steps:
step 1, die-casting, namely die-casting an aluminum magnesium alloy supplied material in a die-casting die to form a shielding shell;
the top surface of the shielding shell is provided with a plurality of first ribs which are transversely arranged and a plurality of second ribs which are longitudinally arranged, counter bores for locking screws penetrate through the intersection positions of the first ribs and the second ribs, and a plurality of shielding spaces are formed between the first ribs and the second ribs;
step 2, CNC machining, namely taking the cooled shielding shell out of the die-casting die and putting the shielding shell into a CNC machine tool for machining;
step 3, surface cleaning and oxidation treatment, namely surface cleaning and oxidation treatment is carried out on the processed shielding shell;
step 4, drying, namely putting the shielding shell with the oxidized surface into a dryer to dry the moisture on the shielding shell;
step 5, dispensing, namely placing the dried shielding shell on a positioning tool of a dispensing machine for positioning, and after the shielding shell is positioned on the positioning tool, dispensing a nickel-carbon adhesive on the top surfaces of the first ribs, the second ribs and the periphery of the inner end of the counter bore by a dispensing hand in the dispensing machine to form a shielding adhesive layer; when the shielding shell and the heat dissipation seat are assembled, signals are prevented from leaking from a gap between the shielding shell and the heat dissipation seat;
the positioning tool comprises a bottom plate, a positioning plate, a first vacuum suction mechanism, a second vacuum suction mechanism and a third vacuum suction mechanism; the bottom plate is hermetically attached to the positioning plate; the bottom surface of the positioning plate is concavely provided with an air passage, and the top surface of the positioning plate is provided with a positioning column; the first vacuum suction mechanism and the second vacuum suction mechanism are respectively arranged at two ends of the top surface of the positioning plate; the third vacuum suction mechanism is arranged in the middle of the top surface of the positioning plate, and the first vacuum suction mechanism, the second vacuum suction mechanism and the third vacuum suction mechanism are communicated with the air passage; the shielding shell is placed on the first vacuum suction mechanism, the second vacuum suction mechanism and the third vacuum suction mechanism and is tightly adsorbed and fixed on the shielding shell;
the first vacuum suction mechanism comprises a suction screw and an elastically deformable vacuum chuck, the suction screw is arranged on the positioning plate, the upper surface and the lower surface of the suction screw penetrate through an air hole, and the lower end of the air hole is communicated with the air passage; the vacuum chuck is arranged at the upper end of the air suction screw, and a suction hole on the vacuum chuck is communicated with the upper end of the air hole;
step 6, drying the glue, namely putting the screened shell subjected to glue dispensing into a glue drying machine to dry the screened glue, taking down the screened shell after drying, and trimming the glue threads;
step 7, packaging, namely packaging the processed shielding shell;
the step 3, surface cleaning and oxidation treatment, comprises the following steps:
3.1, ultrasonic pre-degreasing, namely putting the processed shielding shell into an ultrasonic pre-degreasing groove, and carrying out ultrasonic pre-degreasing on the shielding shell 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, carrying out ultrasonic main degreasing, namely putting the shield shell subjected to pre-degreasing into an ultrasonic main degreasing tank, and carrying out ultrasonic main degreasing on the shield shell 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;
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: 6-8min; 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;
step 3.3, washing with tap water 1, namely putting the shielding shell subjected to the ultrasonic main degreasing into a first washing tank, and washing the product with the tap water in the first washing tank to remove dirt;
step 3.4, washing with tap water 2, namely putting the shielding shell washed in the tap water washing 1 into a second washing tank, and washing the product with the tap water in the second washing tank to remove dirt;
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;
step 3.5, activating, namely putting the shielding shell 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 activating agent and water, and the LF-029P2 activating agent accounts for 5-10% of the activation liquid; pH of the activating solution: 0.5-2, total acidity: 10-25, activation reaction working time: 0.5-1min;
step 3.6, washing with tap water 3, namely putting the shielding shell 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;
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, working principle and water washing time of tap water in tap water washing 4, tap water washing 5 and tap water washing 6 in the following steps are the same as those of tap water washing 3;
step 3.7, washing with tap water 4, namely putting the shielding shell 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 shielding shell which is washed by the tap water 4 into a first pure water tank, and washing the product by pure water in the first pure water tank to remove dirt;
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;
step 3.9, passivating 1, namely putting the shielding shell which is 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 shielding shell;
step 3.10, passivating 2, placing the shielding shell passivated in the passivation 1 into a second passivation tank to react with passivation solution, and further generating a conductive oxide film with good corrosion resistance on the surface of the shielding shell;
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 Cr in the two tanks 3+ The contents are as follows: 2.0-4.0 g/L;
step 3.11, washing with tap water 5, namely putting the shielding shell 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 shielding shell washed in the tap water 5 into a sixth washing tank, and washing the product with the tap water in the sixth washing tank to remove dirt;
step 3.13, pure water washing 2, namely, putting the shielding shell which is washed by the tap water washing 6 into a second pure water tank, and washing the product by the pure water in the second pure water tank to remove dirt;
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 is as follows: 6-7, overflowing the pure water when the pure water washing 2 works, wherein the washing time is 10-30 seconds.
2. The production molding process of the shield shell according to claim 1, wherein: a plurality of shielding shells are mounted on a frame and used for transporting and transferring orders, and the two adjacent shielding shells are mutually isolated by a metal net, so that poor contact caused by superposition of working surfaces of the shielding shells is avoided.
3. The production molding process of the shield shell according to claim 1, wherein: the oxidized shielding shell needs to be isolated by a protective material, so that an oxide layer is prevented from being scratched; the periphery is shielded by a stretching film during the process of transferring, so that secondary pollution is prevented, and the oxidized product is forbidden to directly contact the ground when being placed.
4. The production molding process of the shield shell according to claim 1, characterized in that: the second vacuum suction mechanism and the third vacuum suction mechanism are the same as the first vacuum suction mechanism in structure.
5. The process for producing and molding a shield shell according to claim 4, wherein: the number of the first vacuum suction mechanisms is 10, and the 10 first vacuum suction mechanisms are arranged on the positioning plate through a base plate; the number of the second vacuum suction mechanisms is 5, and the 5 second vacuum suction mechanisms are arranged on the positioning plate at intervals; the number of the third vacuum suction mechanisms is 18, and the 18 third vacuum suction mechanisms are arranged in a row.
6. The production molding process of the shield shell according to claim 5, wherein: the third vacuum suction mechanism is arranged on the positioning plate through a base plate, the upper surface of the base plate is convexly provided with an installation column, a through hole penetrates through the upper surface and the lower surface of the installation column, and the through hole is communicated with the air passage; and an air suction screw in the third vacuum suction mechanism is arranged on the through hole and is communicated with the through hole.
7. The production molding process of the shield shell according to claim 1, wherein: a plurality of equal-height columns for supporting the shielding cover are fixed on the positioning plate and are arranged on the positioning plate at intervals.
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| CN202011083607.2A CN112188820B (en) | 2020-10-12 | 2020-10-12 | Shielding shell production forming process |
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| CN202011083607.2A CN112188820B (en) | 2020-10-12 | 2020-10-12 | Shielding shell production forming process |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN205851284U (en) * | 2016-06-30 | 2017-01-04 | 东莞市建升压铸科技有限公司 | Vacuum chuck tooling |
| CN110863210A (en) * | 2019-11-29 | 2020-03-06 | 四川众兴汽车零部件有限公司 | Surface treatment method for Audi C8 base structural member |
| CN211184816U (en) * | 2020-01-06 | 2020-08-04 | 北京优航机电技术有限公司 | Multi-region shielding structure of high-frequency circuit board |
| CN111530715A (en) * | 2020-05-27 | 2020-08-14 | 东莞奔昱塑胶有限公司 | Fingerprint-free oil spraying process for bathroom products |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101752642A (en) * | 2010-02-09 | 2010-06-23 | 安徽省大富机电技术有限公司 | Cavity filter casing, cavity making method and cover plate making method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205851284U (en) * | 2016-06-30 | 2017-01-04 | 东莞市建升压铸科技有限公司 | Vacuum chuck tooling |
| CN110863210A (en) * | 2019-11-29 | 2020-03-06 | 四川众兴汽车零部件有限公司 | Surface treatment method for Audi C8 base structural member |
| CN211184816U (en) * | 2020-01-06 | 2020-08-04 | 北京优航机电技术有限公司 | Multi-region shielding structure of high-frequency circuit board |
| CN111530715A (en) * | 2020-05-27 | 2020-08-14 | 东莞奔昱塑胶有限公司 | Fingerprint-free oil spraying process for bathroom products |
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