CN107723753B - Preparation method of high-strength high-toughness nickel metal shielding tool - Google Patents
Preparation method of high-strength high-toughness nickel metal shielding tool Download PDFInfo
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- CN107723753B CN107723753B CN201710885480.8A CN201710885480A CN107723753B CN 107723753 B CN107723753 B CN 107723753B CN 201710885480 A CN201710885480 A CN 201710885480A CN 107723753 B CN107723753 B CN 107723753B
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- plastic product
- sand blasting
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- mold core
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 158
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 79
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 28
- 239000002184 metal Substances 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title claims abstract description 7
- 238000005488 sandblasting Methods 0.000 claims abstract description 63
- 239000003973 paint Substances 0.000 claims abstract description 56
- 238000005507 spraying Methods 0.000 claims abstract description 51
- 238000000034 method Methods 0.000 claims abstract description 18
- 239000007921 spray Substances 0.000 claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 238000009966 trimming Methods 0.000 claims abstract description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052802 copper Inorganic materials 0.000 claims abstract description 5
- 239000010949 copper Substances 0.000 claims abstract description 5
- 239000004033 plastic Substances 0.000 claims description 89
- 229920003023 plastic Polymers 0.000 claims description 89
- 239000011248 coating agent Substances 0.000 claims description 35
- 238000000576 coating method Methods 0.000 claims description 35
- 239000004576 sand Substances 0.000 claims description 32
- 229910000831 Steel Inorganic materials 0.000 claims description 22
- 239000010959 steel Substances 0.000 claims description 22
- 238000004070 electrodeposition Methods 0.000 claims description 13
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical group CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 12
- 239000003085 diluting agent Substances 0.000 claims description 11
- 239000011159 matrix material Substances 0.000 claims description 11
- 238000002844 melting Methods 0.000 claims description 10
- 230000008018 melting Effects 0.000 claims description 10
- 238000005498 polishing Methods 0.000 claims description 10
- 229910052593 corundum Inorganic materials 0.000 claims description 6
- 239000010431 corundum Substances 0.000 claims description 6
- 238000007667 floating Methods 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 6
- KERTUBUCQCSNJU-UHFFFAOYSA-L nickel(2+);disulfamate Chemical compound [Ni+2].NS([O-])(=O)=O.NS([O-])(=O)=O KERTUBUCQCSNJU-UHFFFAOYSA-L 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 6
- 238000005476 soldering Methods 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 6
- 206010028980 Neoplasm Diseases 0.000 claims description 5
- 229910021586 Nickel(II) chloride Inorganic materials 0.000 claims description 5
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 5
- 239000004327 boric acid Substances 0.000 claims description 5
- QMMRZOWCJAIUJA-UHFFFAOYSA-L nickel dichloride Chemical compound Cl[Ni]Cl QMMRZOWCJAIUJA-UHFFFAOYSA-L 0.000 claims description 5
- RHZZVWTVJHZKAH-UHFFFAOYSA-K trisodium;naphthalene-1,2,3-trisulfonate Chemical compound [Na+].[Na+].[Na+].C1=CC=C2C(S([O-])(=O)=O)=C(S([O-])(=O)=O)C(S(=O)(=O)[O-])=CC2=C1 RHZZVWTVJHZKAH-UHFFFAOYSA-K 0.000 claims description 5
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 4
- 239000003082 abrasive agent Substances 0.000 claims description 4
- 239000011247 coating layer Substances 0.000 claims description 4
- 239000011246 composite particle Substances 0.000 claims description 4
- 238000012986 modification Methods 0.000 claims description 4
- 230000004048 modification Effects 0.000 claims description 4
- 229910052709 silver Inorganic materials 0.000 claims description 4
- 239000004332 silver Substances 0.000 claims description 4
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 3
- 238000012797 qualification Methods 0.000 abstract description 2
- 238000009713 electroplating Methods 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 239000000047 product Substances 0.000 description 103
- 239000010410 layer Substances 0.000 description 18
- 238000007747 plating Methods 0.000 description 15
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 229910001018 Cast iron Inorganic materials 0.000 description 3
- 229910001069 Ti alloy Inorganic materials 0.000 description 3
- 238000010422 painting Methods 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010309 melting process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000007591 painting process Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D1/00—Electroforming
- C25D1/10—Moulds; Masks; Masterforms
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D1/00—Electroforming
- C25D1/20—Separation of the formed objects from the electrodes with no destruction of said electrodes
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/12—Electroplating: Baths therefor from solutions of nickel or cobalt
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
The invention discloses a preparation method of a nickel metal shielding tool with high strength and high toughness, which specifically comprises the following steps: manufacturing a mold core, spraying conductive paint, electrodepositing, demolding the mold core, sandblasting, rough trimming, fine trimming, assembling and inspecting. The invention can copy 100% of the die core product, ensures the complete attachment of the product after the shielding tool is manufactured subsequently, and improves the qualification rate of the product, the tool can be used for shielding spray paint of full electroplating and color-register spray paint of various products, the process diversity of the same product is increased, the service life is over 20 ten thousand times, the service life of the same product is prolonged, the service cost is reduced, and the method solves the problem that the traditional nickel tool is hard and brittle, and has the toughness of the copper tool and the hardness of the nickel tool.
Description
Technical Field
The invention relates to a surface treatment technology of automobile plastic parts, in particular to a preparation method of a high-strength high-toughness nickel metal shielding tool.
Background
With the increasing requirements of automobiles, innovations and improvements on the technology of automobile parts are caused. The shielding painting or the color register painting process is carried out, the shielding painting requirement strictly exceeds the color register painting of the traditional handicraft, and the shielding tool is provided. Tooling: the technical equipment is a correction tool manufactured for meeting the production of a certain product, the problem that paint cannot fly out or cannot be sprayed to a position when a shielding tool sprays paint is required, otherwise, the problem that the paint is wiped off by increasing manpower or the defect is caused by bottom exposure can occur, the qualification rate is reduced, and meanwhile, the blank to be sprayed is required to have the correction effect on the product in the process of pressing the product down by the tool due to the deformation problem. The increase of frock surface paint spraying thickness is shielded to the conventionality at the in-process that sprays paint to shield the frock, leads to needing to take out paint through wasing, and has increased the cleaning frequency, can not play fine shielding effect to the plastics product of deformation, and the utilization ratio is lower, and it is great to shield the error in addition, can not be accurate play the effect of shielding.
Disclosure of Invention
The invention aims to solve the problems that in the prior art, the tool needs to be frequently cleaned, the thickness of a nickel coating cannot meet the requirement, a painted blank is deformed, the toughness is cracked or cracked in the frequent use process of the tool, the matching error of the tool and a product is large, the shielding effect is poor, the use range is limited, the service life is short and the like. The following technical scheme is provided:
a preparation method of a high-strength high-toughness nickel metal shielding tool comprises the following steps:
1) manufacturing a mold core: fixing the blank plastic product on the flat plate by using the putty, and filling the blank-free plastic product on the flat plate by using the putty to form a plastic product mold core;
2) spraying conductive paint: electrically conductive paint is prepared according to the following steps: diluent =1: 0.5-2, and adjusting the viscosity of the conductive paint to 14mPa.s-1Uniformly coating the conductive paint on a plastic product mold core by using a gravity type spray gun with the caliber of 1.0mm and the air pressure of 0.3 Mpa;
3) electro-deposition: connecting wires are arranged at two ends of a plastic product mold core after the conductive paint is sprayed, the plastic product mold core is placed in a solution, electrodeposition is carried out for 48 hours, the plastic product mold core can be taken out when the thickness of a nickel coating is 10mm, and the solution contains:
nickel sulfamate with the concentration of 300-500g/L, nickel chloride with the concentration of 10-15 g/L, boric acid with the concentration of 30-40 g/L, sodium naphthalene trisulfonate with the concentration of 7.5g/L and sodium dodecyl sulfate with the concentration of 1-2 g/L;
pH of the solution: 3.5-4.5, temperature of 50-60 ℃, current density: 10-30A per square meter;
4) demolding: heating and melting to strip the plastic product mold core from the nickel coating;
5) sand blasting treatment: carrying out sand blasting treatment on the outer surface of the nickel coating layer of the plastic product;
6) rough trimming: removing sand blasting flash and sand blasting accumulated tumors around the outer surface of the nickel coating, sawing sand edges according to the size of a plastic product by using a multi-face tooth linear saw blade with the length of 130mm and the diameter of 1mm, and reserving the residual sand edges with the width of 0.2mm at the edge of a spraying area;
7) fine modification: finishing the margin of 0.2mm of the edge of the reserved spraying area of the nickel coating in the step 6) by using a double-line miniature middle-tooth file, polishing smoothly and removing burrs;
8) assembling: welding a round steel sheet with the diameter of 10mm into a rectangular or circular frame or a frame in the shape of the actual non-spraying area of the plastic product according to the non-spraying area of the plastic product, buckling the refined nickel coating on the non-spraying area of the product, and bonding the round steel sheet and the nickel coating into a whole by soldering after alignment is completed to obtain a nickel metal shielding tool product;
9) and (4) checking: and (4) performing trial spraying on a sample of the nickel metal shielding tool product after the plastic product is installed, and detecting whether paint is exposed from the round steel sheet or other flashes exist.
Preferably, the sand blasting treatment is carried out on the spraying part by adopting a sand blasting machine with a screening device, the sand blasting abrasive is 24# white corundum sand, the sand blasting pressure is 0.2-0.6 MPa, the sand blasting distance is 100-300 mm from a to-be-sprayed area, and the pressure direction is not vertical to the surface of the matrix so as to prevent sand grains from being embedded into the surface of the matrix; after sand blasting, the broken sand and the floating ash adhered to the surface of the workpiece are blown off by clean and dry compressed air.
Preferably, the heating and melting temperature in the step 4) is controlled to be 120-140 ℃.
Preferably, the conductive paint is a conductive paint containing copper and silver composite particles and with the model number of D609, and the diluent is ethyl acetate.
The invention has the beneficial effects that:
1. the nickel coating which is convenient to process is obtained through an electrodeposition process, the nickel coating is uniform in thickness and free of pinholes, a reverse manufacturing process is utilized, namely a nickel metal shielding tool product is manufactured from a plastic product blank, and then the nickel metal shielding tool product and the plastic product are aligned to detect whether defects exist or not, so that the nickel metal shielding tool product can be effectively attached to the plastic product, zero-error and zero-clearance fit is realized, the precision of the machined tool is far higher than that of the machined tool, and meanwhile, the problems that the conventional tool shielding product and the plastic product are too much or are not in place in alignment are solved;
2. the shielding tool obtained by effectively combining the nickel plating layer and the round steel has good shape righting effect on deformed products, so that the utilization rate of plastic products is improved, the rejection rate is reduced, and the cost is reduced;
3. the casting layer with higher toughness is obtained by reasonably adjusting the casting layer process, the thickness of 0.1mm can be achieved on the skirt edge of the shielding edge without breaking, and a high-precision shielding tool is obtained;
4. the tool is wide in application range, can be used for color register paint spraying, and is not limited by product materials.
Drawings
Fig. 1 is a flow chart of the preparation of the high-strength high-toughness nickel metal shielding tool of the invention.
Detailed Description
The following describes the object of the present invention in further detail with reference to the drawings and specific examples, which are not repeated herein, but the embodiments of the present invention are not limited to the following examples.
As shown in fig. 1, a method for manufacturing a high-strength and high-toughness nickel metal shielding tool includes the following steps:
1) a step of manufacturing a mold core, which is to fix the blank plastic product after cleaning and polishing on a flat plate by using putty, and fill the blank-free plastic product on the flat plate by using putty to form the plastic product mold core;
2) spraying conductive paint: electrically conductive paint is prepared according to the following steps: diluting and blending the diluent =1: 0.5-2, and adjusting the viscosity of the conductive paint to 14mPa.s-1Uniformly coating the conductive paint on a plastic product mold core by using a gravity type spray gun with the caliber of 1.0mm and the air pressure of 0.3 Mpa;
3) electro-deposition: connecting wires at two ends of a plastic product mold core which is sprayed with the conductive paint, placing the plastic product mold core and the solution for electrodeposition for 48h, taking out the plastic product mold core when the thickness of a nickel coating reaches 10mm, wherein the solution comprises:
500g/L nickel sulfamate with the concentration of 300-,
pH of the solution: 3.5-4.5, temperature of 50-60 ℃, current density: 10 to 30A/m2；
4) Demolding: stripping the plastic product mold core from the nickel coating by using a heating and melting method, wherein the temperature needs to be controlled in the heating and melting process, and whether the plastic product mold core is uniformly heated or not;
5) sand blasting treatment: carrying out sand blasting treatment on the outer surface of the nickel coating layer of the plastic product;
6) rough trimming: removing sand blasting flash and sand blasting accumulated tumors around the outer surface of the nickel plating layer, sawing off sand edges according to the size of a plastic product by using a multi-face tooth linear saw blade with the length of 130mm and the diameter of 1mm, and reserving the residual sand edges with the width of 0.2mm on the edge of a reserved spraying area;
7) fine modification: finishing the allowance of 0.2mm width of the edge of the reserved spraying area of the nickel plating layer in the step 6) by using a double-line miniature middle-tooth file, polishing smoothly and removing burrs;
8) assembling: welding a round steel sheet with the diameter of 10mm into a rectangular or circular frame according to the non-spraying area of the plastic product or according to the shape of the actual non-spraying area of the plastic product, buckling the refined nickel plating layer on the non-spraying area of the product, and bonding the round steel and the nickel plating layer by soldering after alignment is completed to obtain a nickel metal shielding tool product;
9) and (4) checking: and (4) trial spraying is carried out on the plastic product arranged on the nickel metal shielding tool product, and whether paint is exposed from the round steel sheet or has flash and is adjusted is detected.
Preferably, the sand blasting treatment is carried out on the spraying part by adopting a sand blasting machine with a screening device, the sand blasting abrasive is 24# white corundum sand, the sand blasting pressure is 0.2-0.6 MPa, the sand blasting distance is 100-300 mm, and the pressure direction is not vertical to the surface of the matrix so as to prevent sand grains from being embedded into the surface of the matrix; after sand blasting, blowing out the broken sand and the floating ash adhered to the surface of the workpiece by clean and dry compressed air; after the sand blasting treatment is required, the roughness Ra of the spraying part of the base material of cast iron, steel-based alloy, high-temperature alloy and titanium alloy is required to be more than or equal to 5.
Preferably, the heating and melting temperature in the step 4) is controlled to be 120-140 ℃.
Preferably, the conductive paint is a conductive paint containing copper and silver composite particles and with the model number of D609, and the diluent is ethyl acetate.
Example 1
Manufacturing a mold core: fixing the blank plastic product after cleaning and polishing on a flat plate by using putty, and filling the blank-free plastic product on the flat plate by using putty to form a plastic product mold core; spraying conductive paint: the conductive paint is prepared by the following steps: diluent =1:0.5, and adjusting the viscosity of the conductive paint to 14mPa.s-1Uniformly coating the conductive paint on a plastic product mold core by using a gravity type spray gun with the caliber of 1.0mm and the air pressure of 0.3 Mpa; electro-deposition: connecting wires at two ends of a plastic product mold core which is sprayed with the conductive paint, placing the plastic product mold core and carrying out electrodeposition in solution for 48h, taking out the plastic product mold core when the thickness of a nickel coating reaches 10mm, wherein the solution contains: 300/L nickel sulfamate, 10g/L nickel chloride, 30g/L boric acid, 7.5g/L sodium naphthalenetrisulfonate and 1g/L additive; and the pH value of the solution is controlled to be 3.5; temperature of the solution was 50 ℃, current density: 10A per square meter; heating and melting the product subjected to nickel electrodeposition at 120 ℃ to strip the plastic product mold core from the nickel coating, controlling the nickel coating to be uniformly heated and preventing the nickel coating which is not uniformly heated from cracking or deforming; carrying out sand blasting treatment on the outer surface of the nickel coating of the removed plastic product, wherein the sand blasting treatment adopts a sand blasting machine with a screening device to carry out sand blasting treatment on a spraying part, a sand blasting abrasive material is 24# white corundum sand, the sand blasting pressure is 0.2MPa, the sand blasting distance is 100mm, and the pressure direction is not vertical to the surface of the matrix so as to prevent sand grains from being embedded into the surface of the matrix; after the sand blasting, the broken sand and the floating dust adhered on the surface of the workpiece are blown off by clean and dry compressed air, then the sand blasting flash and the sand blasting accumulated edge around the outer surface of the nickel plating layer are removed, and a multi-tooth wire saw blade with the length of 130mm and the diameter of 1mm is utilized according to the size of a plastic productSawing off the sand edges according to the size of the product, reserving the residual sand edges with the width of 0.2mm at the edges of the plastic product, finishing the residual sand edges with the width of 0.2mm at the edges of the reserved spraying area by using a double-line miniature middle-tooth file, polishing the finished sand edges smoothly, and removing burrs; welding a round steel sheet with the diameter of 10mm into a rectangular or circular frame according to the non-spraying area of the plastic product or according to the shape of the actual non-spraying area of the plastic product, buckling the refined nickel plating layer on the non-spraying area of the product, and bonding the round steel and the nickel plating layer by soldering after alignment is completed to obtain a nickel metal shielding tool product; aligning the manufactured nickel metal shielding tool product with a plastic product, trying to spray, detecting whether paint is exposed from the round steel sheet or has flash, and properly adjusting to ensure that the obtained nickel metal shielding tool product has no paint leakage and can be well aligned with the plastic product.
Example 2
Fixing the blank plastic product after cleaning and polishing on a flat plate by using putty, and filling the blank-free plastic product on the flat plate by using putty to form a plastic product mold core; the conductive paint is prepared by the following steps: the diluent =1:2 is diluted and prepared, and the viscosity of the conductive paint is adjusted to 14mPa.s-1Uniformly coating the conductive paint on a plastic product mold core by using a gravity type spray gun with the caliber of 1.0mm and the air pressure of 0.3 Mpa; connecting leads at two ends of a plastic product mold core after spraying the conductive paint, placing the conductive paint and performing electrodeposition in a solution, wherein the electrodeposition time is 48 hours, the conductive paint can be taken out when the thickness of a nickel coating reaches 10mm, the solution comprises nickel sulfamate with the concentration of 500g/L, nickel chloride with the concentration of 15g/L, boric acid with the concentration of 40g/L, sodium naphthalene trisulfonate with the concentration of 7.5g/L and an additive with the concentration of 2g/L, the pH value of the solution is 4.5, and the temperature of the solution is 60 ℃; the current density is as follows: 30A/square meter; stripping the plastic product mold core from the nickel coating by using a heating and melting method at 140 ℃ and controlling the nickel coating to be heated uniformly; carrying out sand blasting treatment on the outer surface of the nickel coating of the removed plastic product, wherein the sand blasting treatment adopts a sand blasting machine with a screening device to carry out sand blasting treatment on a spraying part, a sand blasting abrasive material is 24# white corundum sand, the sand blasting pressure range is 0.6MPa, the sand blasting distance is 300mm, the pressure direction is not vertical to the surface of the matrix so as to prevent sand grains from being embedded into the surface of the matrix; after sand blastingBlowing the broken sand and the floating ash adhered to the surface of the workpiece by clean and dry compressed air; after the sand blasting treatment is required, the roughness Ra of the spraying part of the base material of cast iron, steel-based alloy, high-temperature alloy and titanium alloy is required to be more than or equal to 5; removing sand blasting flash and sand blasting accumulated tumors around the outer surface of the nickel-plated manufactured layer, sawing off sand edges according to the size of a plastic product and reserving the residual sand edges with the width of 0.2mm at the edge of the plastic product by using a multi-toothed linear saw blade with the length of 130mm and the diameter of 1 mm; finishing the margin of the width of 0.2mm of the edge of the reserved spraying area of the nickel plating layer by using a double-line miniature middle-tooth file, polishing the margin smoothly and removing burrs; welding a round steel sheet with the diameter of 10mm into a rectangular or circular frame according to the non-spraying area of the plastic product or according to the shape of the actual non-spraying area of the plastic product, buckling the refined nickel plating layer on the non-spraying area of the product, and bonding the round steel and the nickel plating layer by soldering after alignment is completed to obtain a nickel metal shielding tool product; and (4) trial spraying is carried out on the plastic product arranged on the nickel metal shielding tool product, and whether paint is exposed from the round steel sheet or has flash and is adjusted is detected.
Example 3
Fixing the blank plastic product after cleaning and polishing on a flat plate by using putty, and filling the blank-free plastic product on the flat plate by using putty to form a plastic product mold core; electrically conductive paint is prepared according to the following steps: the diluent =1:1.3 is diluted and prepared, and the viscosity of the conductive paint is adjusted to 14mPa.s-1Uniformly coating the conductive paint on a plastic product mold core by using a gravity type spray gun with the caliber of 1.0mm and the air pressure of 0.3 Mpa; connecting wires at two ends of a plastic product mold core which is sprayed with the conductive paint, placing the plastic product mold core and carrying out electrodeposition in solution for 48h, taking out the plastic product mold core when the thickness of a nickel coating reaches 10mm, wherein the solution contains:
nickel sulfamate with the concentration of 400g/L, nickel chloride with the concentration of 12g/L, boric acid with the concentration of 35g/L, sodium naphthalene trisulfonate with the concentration of 7.5g/L, sodium dodecyl sulfate with the concentration of 1.5g/L, and pH of the solution: 4. temperature 55 ℃, current density: 20A/square meter; stripping the plastic product mold core from the nickel coating by using a 130 ℃ high-temperature heating and melting method, wherein the temperature needs to be controlled in the heating and melting process, and whether the plastic product mold core is uniformly heated or not; carrying out sand blasting treatment on the outer surface of the nickel coating layer of the plastic product; removing sand blasting flash and sand blasting accumulated tumors around the outer surface of the nickel plating layer, sawing off sand edges according to the size of a plastic product by using a multi-face tooth linear saw blade with the length of 130mm and the diameter of 1mm, and reserving the residual sand edges with the width of 0.2mm on the edge of a reserved spraying area; further, a double-line miniature middle-tooth file is used for finely trimming the margin of 0.2mm of the width of the edge of the reserved spraying area of the nickel plating layer, polishing the margin smoothly and removing burrs; performing sand blasting treatment on a spraying part by adopting a sand blasting machine with a screening device, wherein a sand blasting abrasive material is 24# white corundum sand, the sand blasting pressure range is 0.4MPa, the sand blasting distance is 200mm, and the pressure direction is not vertical to the surface of the matrix so as to prevent sand grains from being embedded into the surface of the matrix; after sand blasting, blowing out the broken sand and the floating ash adhered to the surface of the workpiece by clean and dry compressed air; after the sand blasting treatment is required, the roughness Ra of the spraying part of the base material of cast iron, steel-based alloy, high-temperature alloy and titanium alloy is required to be more than or equal to 5; welding a round steel sheet with the diameter of 10mm into a rectangular or circular frame according to the non-spraying area of the plastic product or according to the shape of the actual non-spraying area of the plastic product, buckling the refined nickel plating layer on the non-spraying area of the product, and bonding the round steel and the nickel plating layer by soldering after alignment is completed to obtain a nickel metal shielding tool product; and (4) trial spraying is carried out on the plastic product arranged on the nickel metal shielding tool product, and whether paint is exposed from the round steel sheet or has flash and is adjusted is detected.
The toughness and the strength of the nickel metal shielding tool product obtained by the three embodiments are different, the plastic product mold core is peeled from the nickel coating by a method of heating and melting at a high temperature of 130 ℃, and the performance of the prepared product is optimal.
The conductive paint is a conductive paint containing copper, silver and other composite particles with a signal of D609, and has good conductive performance; diluent agent: the process uses ethyl acetate as diluent to dissolve and dilute crude oil of paint.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (4)
1. A preparation method of a high-strength high-toughness nickel metal shielding tool is characterized by comprising the following steps:
1) manufacturing a mold core: fixing the blank plastic product on the flat plate by using the putty, and filling the blank-free plastic product on the flat plate by using the putty to form a plastic product mold core;
2) spraying conductive paint: the conductive paint is prepared by the following steps: diluent =1: 0.5-2 until the viscosity of the conductive paint is 14mPa.s-1Uniformly coating the conductive paint on a plastic product mold core by using a gravity type spray gun with the caliber of 1.0mm and the air pressure of 0.3 Mpa;
3) electro-deposition: connecting wires are arranged at two ends of a plastic product mold core after the conductive paint is sprayed, the plastic product mold core is placed in a solution, electrodeposition is carried out for 48 hours, the plastic product mold core can be taken out when the thickness of a nickel coating is 10mm, and the solution contains:
nickel sulfamate with the concentration of 300-500g/L, nickel chloride with the concentration of 10-15 g/L, boric acid with the concentration of 30-40 g/L, sodium naphthalene trisulfonate with the concentration of 7.5g/L and sodium dodecyl sulfate with the concentration of 1-2 g/L
pH of the solution: 3.5-4.5, temperature of 50-60 ℃, current density: 10-30A per square meter;
4) demolding: heating and melting to strip the plastic product mold core from the nickel coating;
5) sand blasting treatment: carrying out sand blasting treatment on the outer surface of the nickel coating layer of the plastic product;
6) rough trimming: removing sand blasting flash and sand blasting accumulated tumors around the outer surface of the nickel coating, sawing sand edges according to the size of a plastic product by using a multi-face tooth linear saw blade with the length of 130mm and the diameter of 1mm, and reserving the residual sand edges with the width of 0.2mm at the edge of a spraying area;
7) fine modification: finishing the margin of 0.2mm of the edge of the reserved spraying area of the nickel coating in the step 6) by using a double-line miniature middle-tooth file, polishing smoothly and removing burrs;
8) assembling: welding a round steel sheet with the diameter of 10mm into a rectangular or circular frame or a frame in the shape of the actual non-spraying area of the plastic product according to the non-spraying area of the plastic product, buckling the refined nickel coating on the non-spraying area of the product, and bonding the round steel sheet and the nickel coating into a whole by soldering after alignment is completed to obtain a nickel metal shielding tool product;
9) and (4) checking: and (4) performing trial spraying on a sample of the nickel metal shielding tool product after the plastic product is installed, and detecting whether paint is exposed from the round steel sheet or other flashes exist.
2. The method for preparing the high-strength high-toughness nickel metal shielding tool according to claim 1, is characterized in that: the sand blasting treatment adopts a sand blasting machine with a screening device to perform sand blasting treatment on a spraying part: the abrasive material for sand blasting is 24# white corundum sand, the sand blasting pressure is 0.2-0.6 MPa, the distance between a sand blasting machine and a spraying part is 100-300 mm, the pressure direction is not perpendicular to the surface of a matrix, and after sand blasting, crushed sand and floating ash adhered to the surface of a workpiece are blown off by clean and dry compressed air.
3. The method for preparing the high-strength high-toughness nickel metal shielding tool according to claim 1, is characterized in that: and 4) controlling the heating and melting temperature in the demoulding at 120-140 ℃.
4. The method for preparing the high-strength high-toughness nickel metal shielding tool according to claim 1, is characterized in that: the conductive paint is D609 conductive paint containing copper and silver composite particles, and the diluent is ethyl acetate.
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