CN113981509A - Fine polishing electrophoresis combined production process for aluminum alloy wheel hub - Google Patents
Fine polishing electrophoresis combined production process for aluminum alloy wheel hub Download PDFInfo
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- CN113981509A CN113981509A CN202111259135.6A CN202111259135A CN113981509A CN 113981509 A CN113981509 A CN 113981509A CN 202111259135 A CN202111259135 A CN 202111259135A CN 113981509 A CN113981509 A CN 113981509A
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- 238000005498 polishing Methods 0.000 title claims abstract description 178
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 84
- 238000001962 electrophoresis Methods 0.000 title claims abstract description 73
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 34
- 238000000227 grinding Methods 0.000 claims abstract description 69
- 238000004140 cleaning Methods 0.000 claims abstract description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 57
- 239000003973 paint Substances 0.000 claims abstract description 49
- 239000000843 powder Substances 0.000 claims abstract description 36
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims abstract description 33
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 30
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- 230000008569 process Effects 0.000 claims abstract description 25
- 238000005507 spraying Methods 0.000 claims abstract description 24
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- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 claims abstract description 4
- 235000009120 camo Nutrition 0.000 claims abstract description 4
- 235000005607 chanvre indien Nutrition 0.000 claims abstract description 4
- 239000011487 hemp Substances 0.000 claims abstract description 4
- 239000004576 sand Substances 0.000 claims description 30
- 238000002791 soaking Methods 0.000 claims description 21
- 239000012530 fluid Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 15
- 239000002253 acid Substances 0.000 claims description 14
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 12
- 230000000694 effects Effects 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 8
- 239000003082 abrasive agent Substances 0.000 claims description 8
- XXROGKLTLUQVRX-UHFFFAOYSA-N allyl alcohol Chemical compound OCC=C XXROGKLTLUQVRX-UHFFFAOYSA-N 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 8
- 239000012459 cleaning agent Substances 0.000 claims description 7
- 238000004381 surface treatment Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 239000003513 alkali Substances 0.000 claims description 5
- 238000007590 electrostatic spraying Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 5
- FENFUOGYJVOCRY-UHFFFAOYSA-N 1-propoxypropan-2-ol Chemical compound CCCOCC(C)O FENFUOGYJVOCRY-UHFFFAOYSA-N 0.000 claims description 4
- DPBJAVGHACCNRL-UHFFFAOYSA-N 2-(dimethylamino)ethyl prop-2-enoate Chemical compound CN(C)CCOC(=O)C=C DPBJAVGHACCNRL-UHFFFAOYSA-N 0.000 claims description 4
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 claims description 4
- 239000004925 Acrylic resin Substances 0.000 claims description 4
- 229920000178 Acrylic resin Polymers 0.000 claims description 4
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 4
- -1 alkyl glycoside Chemical class 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 4
- POLCUAVZOMRGSN-UHFFFAOYSA-N dipropyl ether Chemical compound CCCOCCC POLCUAVZOMRGSN-UHFFFAOYSA-N 0.000 claims description 4
- 239000003814 drug Substances 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 229930182470 glycoside Natural products 0.000 claims description 4
- DXGLGDHPHMLXJC-UHFFFAOYSA-N oxybenzone Chemical compound OC1=CC(OC)=CC=C1C(=O)C1=CC=CC=C1 DXGLGDHPHMLXJC-UHFFFAOYSA-N 0.000 claims description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 4
- 239000001509 sodium citrate Substances 0.000 claims description 4
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 3
- 230000009182 swimming Effects 0.000 claims 1
- 238000005260 corrosion Methods 0.000 abstract description 9
- 230000007797 corrosion Effects 0.000 abstract description 8
- 238000009713 electroplating Methods 0.000 abstract description 3
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 238000007517 polishing process Methods 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000002932 luster Substances 0.000 abstract description 2
- 244000137852 Petrea volubilis Species 0.000 abstract 2
- 238000007711 solidification Methods 0.000 abstract 2
- 230000008023 solidification Effects 0.000 abstract 2
- 239000001993 wax Substances 0.000 description 42
- 239000000243 solution Substances 0.000 description 11
- 238000005488 sandblasting Methods 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 239000000428 dust Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000036541 health Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 150000003839 salts Chemical class 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/22—Servicing or operating apparatus or multistep processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/12—Light metals
- C23G1/125—Light metals aluminium
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
- C23G1/22—Light metals
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/12—Electrophoretic coating characterised by the process characterised by the article coated
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/20—Pretreatment
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The invention discloses a production process for aluminum alloy wheel hub by combining fine polishing electrophoresis, which comprises the following steps: fine polishing, oil removal, pure water washing, electrophoresis and solidification, transparent powder spraying and solidification. The fine polishing comprises automatic fine polishing or manual fine polishing. The manual fine polishing comprises the steps of sanding a blank with No. 120 abrasive paper, grinding with No. 240 abrasive paper, grinding with a hemp wheel, removing wax and grinding with a cloth wheel; the automatic fine polishing comprises opening of No. 120 sand paper, grinding of No. 240 and No. 400 sand paper, resin abrasive medium polishing and zirconium ball fine polishing; the oil removal comprises alkaline cleaning oil removal or acidic oil removal; the electrophoresis mainly refers to electrophoresis of colored transparent paint, the voltage is 120V to 160V, and the time is 0.5min to 2 min. The invention combines the advantages of the fine polishing process and the electrophoresis process, not only improves the color diversity of the hub, keeps the luster of the fine polished product after electrophoresis, but also improves the corrosion resistance, the service life and the environmental adaptability of the fine polished hub, and the operation process is simpler than electroplating and the environmental pollution is less than that of electroplating.
Description
Technical Field
The invention relates to a surface treatment technology of an aluminum alloy hub, in particular to a production process for accurately polishing and electrophoresis combining an aluminum alloy hub used on the aluminum alloy hub.
Background
With the saturation of automobiles and the annual increase of aluminum alloy hub production lines, the phenomenon of excess capacity of aluminum alloy hubs appears in the industry. And with the annual downward exploration of automobile prices, the sales profits of the aluminum alloy hubs are increasingly reduced, which brings huge pressure to aluminum alloy hub manufacturers and also highlights the importance of improving the core competitiveness of products.
The core competitiveness of the aluminum alloy hub product includes the individuation and the color diversity of the product besides the mechanical property, the coating property and the like of the aluminum alloy hub product. With the improvement of social aesthetics, the aluminum alloy hub product made by only adopting the conventional industrial fine polishing, electrophoresis, full coating, fine turning and bright surface cannot meet the requirements of part of high-end customers. The aluminum alloy wheel hub which is only polished precisely has the defect that the aluminum alloy wheel hub product is not acid-base resistant in the using process and is easy to lose luster; the method is characterized in that an electrophoretic color clear paint process is adopted for the aluminum alloy wheel hub, so that the glossiness of an aluminum alloy wheel hub product is insufficient, and the requirements of many customers on the glossiness of the product cannot be met; the adoption of electroplating and other processes has the disadvantages of complex surface treatment operation process and great environmental pollution. Therefore, the process needs to be improved and innovated aiming at the existing problems, and the aluminum alloy hub fine polishing electrophoresis combined production process with better corrosion resistance and diversified colors is provided.
Disclosure of Invention
The invention provides a fine polishing electrophoresis combined production process for an aluminum alloy hub, which can improve the color diversity and corrosion resistance of the aluminum alloy hub and keep higher glossiness, aiming at solving the problems of poor acid and alkali resistance and poor corrosion resistance, insufficient glossiness, complex surface treatment operation process, great environmental pollution and the like existing in the conventional surface treatment industrial process of the conventional aluminum alloy hub.
The invention adopts the following specific technical scheme for solving the technical problems: the fine polishing electrophoresis combined production process of the aluminum alloy hub is characterized by comprising the following steps of: comprises the following process manufacturing steps
A1. Carrying out finish polishing treatment on the outer surfaces of the spoke and the upper rim of the aluminum alloy hub to ensure that the glossiness of the outer surfaces of the spoke and the upper rim of the aluminum alloy hub reaches 500 GU-650 GU;
A2. carrying out oil and wax removal treatment on the surface of the aluminum alloy hub, wherein the glossiness of the spoke of the aluminum alloy hub and the outer surface of the upper rim is required to be kept within the range of 500GU to 650 GU;
A3. cleaning the surface of the aluminum alloy hub treated in the steps A1 to A2 by using pure water, wherein the glossiness of the outer surface of the spoke and the outer surface of the upper rim of the aluminum alloy hub are required to be kept within the range of 500GU to 650 GU;
A4. carrying out cathode electrophoresis film forming treatment on the aluminum alloy hub by using colored transparent electrophoretic paint, and then carrying out baking and curing paint film treatment;
A5. spraying transparent powder and curing the aluminum alloy hub treated in the step A4;
A6. and obtaining the bright color surface treatment effect of the target aluminum alloy hub.
Performing fine polishing treatment; the glossiness of the outer surfaces of the spoke and the upper rim of the aluminum alloy hub reaches 500GU to 650GU, the surface particles are fine, the surface particles are cleaned and then subjected to electrophoretic coloring by using colored transparent electrophoretic paint, the electrophoretic paint is very compact in combination with the surface, the surface of the electrophoretic paint also has high glossiness, and the transparent powder is used for covering and protecting the colored paint film, so that the surface gloss of the precisely-polished rim can obtain transparent color appearance through the colored paint film and the transparent powder coating, the color can be kept for a long time, the advantages of the precise polishing and the electrophoretic process are effectively improved and innovatively combined, the color diversity and the corrosion resistance of the aluminum alloy hub can be improved, the high glossiness is kept, the appearance of the hub has unique and very bright color, attractive attention is paid, and the aluminum alloy hub is greatly distinguished from other commonly-coated hubs.
Preferably, in the step a1, the finish polishing treatment comprises manual sand blasting, manual grinding, cleaning and manual finish polishing treatment, wherein the No. 120 to No. 400 abrasive paper is rolled into a cylindrical grinding head, and the cylindrical grinding head is driven to rotate by an electric and/or pneumatic tool to perform sand blasting treatment on the spokes of the hub and the corners of the outer surface of the upper rim so that the roughness of the spokes and the corners of the outer surface of the upper rim reaches 1 μm to 1.5 μm; wrapping the 120# to 180# abrasive belts on the outer surface of a grinding disc, and driving the grinding disc to perform sand opening treatment on the outer surfaces of the spokes of the wheel hub and the upper wheel rim by using a first polishing machine to enable the roughness of the spokes and the upper wheel rim to reach 2-3 microns; driving a hemp wheel to remove sand grains formed by sand opening by using a second polishing machine, so that the roughness of the sand grains reaches 0.4-0.6 mu m and the glossiness of the sand grains reaches 350-450 GU; driving a hard cloth wheel by a second polishing machine to further polish and remove grains, so that the roughness of the hard cloth wheel reaches 0.2-0.4 mu m and the glossiness of the hard cloth wheel reaches 500-630 GU; carrying out oil and wax removal cleaning on the hub by using hot water and a cleaning agent; further polishing diagonally by using an electric tool or a pneumatic tool to remove lines, so that the roughness of the yellow cloth strip reaches 0.1-0.3 mu m and the glossiness of the yellow cloth strip reaches 500-630 GU; and further polishing other surfaces by using a fine cloth wheel to remove grains, so that the roughness of the surface reaches 0.1-0.3 mu m and the glossiness reaches 500-630 GU. The fine polishing can use the traditional manual fine polishing, the whole process from sand opening to fine polishing is included, the process is mature, the polishing effect is controlled by experienced workers of the last fine polishing process, the requirement of light chromaticity can be basically met, the whole investment is small, the effect is quick, and the method is suitable for the fine polishing of all wheel hub shapes, particularly wheel hubs with multiple pits, multiple thin and narrow spokes, complex curved groove shapes and the like on the surface of a spoke, and only the manual fine polishing can be adopted, so that the defect is that the manual polishing is large in pollution and is not friendly to the health of workers.
Preferably, in the step a1, the finish polishing treatment comprises manual sand blasting, manual grinding, cleaning, automatic middle polishing and automatic finish polishing, the No. 120 to No. 400 abrasive paper is rolled into a cylindrical grinding head, the cylindrical grinding head is driven to rotate by an electric and/or pneumatic tool, and then the sand blasting treatment is carried out on the spoke of the wheel hub and the corner part of the outer surface of the upper rim, so that the roughness of the wheel hub reaches 1 to 3 μm; wrapping the 120# to 180# abrasive belts on the outer surface of a grinding disc, and driving the grinding disc to perform sand opening treatment on the outer surfaces of the spokes of the wheel hub and the upper wheel rim by using a first polishing machine to enable the roughness of the spokes and the upper wheel rim to reach 2-3 microns; manually grinding with 200# to 260# sandpaper to make the roughness reach 1.5 to 2.0 μm and the glossiness reach 80 to 160 GU; carrying out oil and wax removal cleaning on the hub by using hot water and a cleaning agent; using a vibration polishing machine and a resin grinding material to carry out automatic polishing, wherein the glossiness of the polished middle part reaches 300GU to 450 GU; and finally, performing automatic fine polishing by using a fluid polishing machine and the mixed zirconium balls, wherein the glossiness of the fine polished zirconium balls reaches 550GU to 650 GU. Even if the spoke surface of the wheel hub is relatively simple in shape, the surface is smooth, the window is large, the corners of the wheel hub are difficult to automatically polish to the technological requirements by a machine, or the corners and the large surface cannot be polished to the same glossiness synchronously, so that the automatic polishing of the wheel hub can not be realized by the machine at present, manual sand blasting and manual grinding are not necessarily adopted, after deep polishing and grinding are carried out on the corner parts, the surfaces are subjected to sand blasting and polishing and grinding, after the corner parts have higher glossiness or finer roughness than the surface parts, hot water and a cleaning agent are used for carrying out oil removal and wax removal cleaning on the wheel hub, a vibration polishing machine is used for carrying out middle polishing to remove sand blasting and grinding left sand grains, the glossiness is further improved, the surface of the wheel hub is further polished by a mixed zirconium ball, grains are further polished and removed, and because the parts such as the corners and the like which are difficult to automatically polish to the high glossiness in advance by manpower, in the same time, more polishing degrees can be improved for the surface which is easy to polish by automatic polishing, so after the automatic polishing is carried out for a period of time, the glossiness of corners and the surface gradually approaches, the effect of process requirements is achieved, polishing solution is added during the automatic polishing, the polishing efficiency is accelerated, the glossiness is improved, meanwhile, the powder generated by the friction of the grinding material and the hub is wetted and washed, similar sludge-like substances generated by the grinding of the surface of the hub are washed away, the surface of the hub is possibly in direct contact with the grinding material, the friction polishing speed is accelerated, no dust is generated, the labor intensity of workers is greatly reduced, and the damage of polishing dust to the health of the workers is reduced.
Preferably, the tree is a treeThe resin abrasive material is conical resin abrasive material with bottom diameter and height of 6-10 mm and density of 1.5g/cm3And when the grain size is between 700# and 900#, the polishing time is between 25 and 45 min. The resin grinding material needs to have a certain volume and density so as to meet the requirement of reaching a certain grinding amount in a certain vibration polishing time, and the vibrating machine can drive the grinding material to vibrate at a higher speed to generate a higher grinding force so as to finish the polishing operation required by the process within 25-45 min, accelerate the vibration polishing speed, improve the integral polishing speed of the hub and reduce the polishing cost.
Preferably, the vibration frequency of the vibration polishing machine is set to be 30Hz to 50Hz, the vibration polishing machine can drive the hub to rotate and rotate at a speed of 50r/min to 70r/min, the vibration polishing machine can drive the hub to reciprocate up and down and reach 25 times/min to 35 times/min, and polishing solution with the concentration of 2 percent to 4 percent is titrated during vibration polishing. The automatic polishing machine with the corresponding functions provides corresponding functions, the vibration frequency of the vibration polishing machine is set within the range of 30Hz to 50Hz, resin grinding materials can be fully vibrated to roll, too large grinding materials cannot be vibrated to jump, the vibration polishing machine drives the hub to rotate, the relative movement speed of the grinding materials and the hub is improved, the grinding speed is improved, the vibration polishing machine can drive the hub to reciprocate up and down, the grinding materials can penetrate through spoke gaps of the hub back and forth, the grinding materials can better grind the surfaces of corners and depths of the hub, the grinding effect of the surfaces of the corners and depths is improved, the consistency of the integral grinding effect of the hub is further improved, polishing liquid is added during automatic polishing, the polishing efficiency is improved, the glossiness is improved, meanwhile, powder generated by friction between the grinding materials and the hub is wetted and washed, sludge-like substances generated by grinding the surface of the hub are washed away, the surface of the hub is in direct contact with the abrasive material as possible, the friction polishing speed is accelerated, no dust is generated to fly, the labor intensity of workers is greatly reduced, the damage of polishing dust to the health of workers is reduced, the wetting effect is not strong if the concentration of the polishing solution is low, the gloss and the like after polishing are not enough, and the polishing time needs to be increased; the concentration of the polishing solution is higher, so that the polishing solution is wasted, and the polishing solution is not matched with the grinding speed of the abrasive, so that local over-etching is easily generated.
Preferably, the mixed zirconium balls are zirconium balls with the diameter of 3mm to 8mm, and the density of the mixed zirconium balls is 2.8g/cm3To 3.5g/cm3The percentage of zirconium balls with the granularity of 1500# to 2000# and the diameter of 3mm is 20 percent to 30 percent, the percentage of zirconium balls with the diameter of 8mm is 30 percent to 50 percent, and the fluid fine polishing time of the mixed zirconium balls is 10min to 20min at normal temperature. The mixed zirconium ball is a sphere with different diameters ranging from 3mm to 8mm, has good rolling property and fluidity, has the characteristics of high density, high hardness, high toughness and the like, and has the grinding efficiency incomparable with the traditional grinding medium.
Preferably, the fluid polishing machine drives the roller to rotate at 10-15 rpm, drives the hub to rotate at 50-70 r/min, and adds polishing solution with concentration of 2-3% during fluid polishing. The roller of the fluid polishing machine rotates to drive the zirconium balls to flow, fluid polishing is carried out on the spoke of the wheel hub and the outer surface of the upper rim, the flowing zirconium balls are transversely stirred by the rotation of the wheel hub, the zirconium balls penetrate through the spoke cavity and the corner of the wheel hub, grinding of the spoke cavity and the corner is enhanced, the polishing effect of the spoke cavity and the corner is increased, the mobility of the zirconium balls is enhanced by polishing liquid, the surface of the wheel hub is cleaned, and the high-gloss effectiveness of fine polishing treatment of the aluminum alloy wheel hub is improved.
Preferably, in the step a2, the oil and wax removing treatment includes alkaline oil and wax removing or acidic oil and wax removing; alkaline deoiling wax removal includes that 5% to 10% deoiling wax removal powder or 2% to 4% alkaline deoiling wax removal agent dissolve and be used for wasing the wheel hub surface in the basin, and the aqueous solution temperature of deoiling wax removal is 35 ℃ to 45 ℃, and the pH value is PH 9 to PH 12, and deoiling wax removal is washd for a long time 3min to 4min, the medicament mass percent composition that the alkaline deoiling was removed and is received is: 3 to 5 percent of sodium carbonate, 1 to 2 percent of alkyl glycoside (APG), 1 to 3 percent of sodium hydroxide, 2 to 4 percent of sodium citrate and the balance of water; the acid oil and wax removing method comprises the steps that 2% to 3% of acid oil and wax removing agent and 15% to 20% of sulfuric acid are dissolved in a water tank and used for cleaning the surface of a hub, oil and wax are removed at normal temperature, PH is 4 to PH 5, and the oil and wax removing cleaning time is 2min to 3 min. A layer of oily wax layer and polishing dirt adhered to the surface of the hub can be generated in polishing processes of sand opening, polishing in grinding, fine polishing and the like, the glossiness is influenced, the cleaning before coating is influenced, oil removal, paraffin removal and cleaning are needed to be carried out independently, the glossiness can be accurately judged after the cleaning, and the subsequent electrophoresis process can be carried out only after the cleaning.
Preferably, in the step A3, the hub is cleaned by pure water, including a soaking cleaning mode and/or a spraying cleaning mode, the conductivity of the pure water is controlled below 10 mu s/cm, and the COD is controlled below 20 mg/L; the cleaning time of the soaking cleaning mode is 45-60 s; the cleaning time of the spray cleaning mode is 20s to 40s, and the spray pressure is 1bar to 1.5 bar. The conductivity of the pure water is controlled to be below 10 mu s/cm, the hub can be cleaned by spraying after being soaked and cleaned, the soaking and cleaning are free from the problem that the hub cannot be sprayed, but the soaking pool is easily polluted by dirty water, the spraying is always washed by the clean pure water, the surface of the hub is very clean after being cleaned by the process, the binding force of paint particles and the hub aluminum alloy matrix is improved, and the effectiveness of cleaning treatment on the aluminum alloy hub is improved.
Preferably, in the step A4, the cathodic electrophoresis and curing paint film treatment comprises protection, pure water cleaning 1, electrophoresis, pure water cleaning 2, water blowing wiping and curing; adopting a blocking tool and an insulating paper tool to carry out protection treatment on the PCD hole of the aluminum alloy hub and the relevant part of the mounting disc; the pure water washing 1 and the pure water washing 2 adopt two modes of soaking washing in a tank and/or hanging spraying washing, wherein the soaking washing is accompanied with swing, the soaking washing time in the tank is 20s to 40s, and the hanging spraying washing time is 20s to 40 s; the temperature of electrophoresis is 28 ℃ to 32 ℃, the voltage is 120V to 160V, the pH is 5.4 to 6.6, the conductivity is 900 Mus/cm to 1200 Mus/cm, the solid content is 10 percent to 20 percent, and the cathode electrophoresis film-forming time is 0.5min to 2 min; after water is blown, the parts which do not need electrophoresis are wiped in time; drying and curing the paint film on the hub, wherein the curing temperature is 150-160 ℃, and the curing time is 20-25 min; the thickness of the cured electrophoretic paint film is 10-15 mu m; the electrophoretic paint adopts colorful transparent electrophoretic paint, and the colorful transparent electrophoretic paint comprises the following resin components in percentage by mass: 25 to 35 percent of methyl methacrylate, 15 to 20 percent of dimethylaminoethyl acrylate, 10 to 15 percent of allyl alcohol propyl ether, 2 to 4 percent of propylene glycol propyl ether, 1 to 3 percent of ethylene glycol butyl ether and 2-hydroxy-4-methoxy benzophenone. After the step A3 is carried out, a plug and an insulating paper prop are adopted to carry out protection treatment on the PCD hole of the aluminum alloy hub and the relevant part of the mounting disc, wherein the PCD hole and the relevant part of the mounting disc are not limited to the aluminum alloy hub, in order to ensure the electrophoresis effect, pure water cleaning 1 and pure water cleaning 2 are further carried out, the phenomenon that the electrophoresis effect is influenced by the pollution to the surface of the hub in the transportation, transportation and protection treatment processes is avoided, the thickness of the electrophoresis film is 10-15 mu m after the electrophoresis of the process parameters provided by the step A4, the colored transparent electrophoresis paint is adopted, the high-glossiness permeation paint film obtained by fine polishing can be fully exerted, the brightness and the color of the electrophoresis paint film are further improved, the color diversity of the hub is enriched, and the reliable effectiveness of the electrophoresis and curing treatment on the aluminum alloy hub is improved.
Preferably, in the step A5, the transparent powder spraying and curing treatment is carried out in a transparent powder electrostatic spraying mode, the voltage is 50kV to 60kV, the powder output is 250g/min to 400g/min, the total air pressure is 3bar to 4bar, the curing temperature is 170 ℃ to 180 ℃, and the heat preservation time is 20min to 25 min; the film thickness of the cured transparent powder is 50-80 μm, and the transparent powder adopts an acrylic resin system and has good acid and alkali resistance and weather resistance. In order to protect the electrophoretic paint film from being oxidized, polluted, broken and the like, the acrylic resin system transparent powder with the film thickness of 50-80 microns and good acid and alkali resistance and weather resistance is sprayed on the electrophoretic paint film by adopting the process for covering protection, so that the powder coating rate of the transparent powder can be effectively ensured, the film thickness can be ensured, the environmental corrosion resistance of the whole paint film is further improved, and the reliable effectiveness and the gloss maintaining effectiveness of the outer layer protection treatment on the aluminum alloy wheel hub are improved.
The invention has the beneficial effects that: the invention combines the advantages of the fine polishing and the electrophoresis process, can eliminate the tiny defect hidden in casting after the spoke surface is finely polished, fully exerts the glossiness of the hub obtained by fine polishing, enhances the transparency of electrophoretic paint, enriches the color diversity of the hub, can also ensure the anti-corrosion performance of the hub, simultaneously keeps the partial gloss of the finely polished hub, and meets the requirements of more high-end customers.
Detailed Description
In embodiment 1, a production process combining fine polishing electrophoresis and electrophoresis of an aluminum alloy hub comprises the following process manufacturing steps:
A1. carrying out finish polishing treatment on the outer surfaces of the spoke and the upper rim of the aluminum alloy hub to ensure that the glossiness of the outer surfaces of the spoke and the upper rim of the aluminum alloy hub reaches 500 GU-650 GU;
A2. carrying out oil and wax removal treatment on the surface of the aluminum alloy hub, wherein the glossiness of the spoke of the aluminum alloy hub and the outer surface of the upper rim is required to be kept within the range of 500GU to 650 GU;
A3. cleaning the surface of the aluminum alloy hub treated in the steps A1 to A2 by using pure water, wherein the glossiness of the outer surface of the spoke and the outer surface of the upper rim of the aluminum alloy hub are required to be kept within the range of 500GU to 650 GU;
A4. carrying out cathode electrophoresis film forming treatment on the aluminum alloy hub by using colored transparent electrophoretic paint, and then carrying out baking and curing paint film treatment;
A5. spraying transparent powder and curing the aluminum alloy hub treated in the step A4;
A6. and obtaining the bright color surface treatment effect of the target aluminum alloy hub.
In the step A1, the fine polishing treatment comprises manual sand opening, manual grinding, cleaning and manual fine polishing treatment, wherein No. 120 to No. 400 abrasive paper is rolled into a cylindrical grinding head, and the cylindrical grinding head is driven to rotate by an electric and/or pneumatic tool to perform sand opening treatment on the spoke of the wheel hub and the corner part of the outer surface of the upper rim so that the roughness of the spoke of the wheel hub reaches 1-1.5 mu m; wrapping the 120# to 180# abrasive belts on the outer surface of a grinding disc, and driving the grinding disc to perform sand opening treatment on the outer surfaces of the spokes of the wheel hub and the upper wheel rim by using a first polishing machine to enable the roughness of the spokes and the upper wheel rim to reach 2-3 microns; driving a hemp wheel to remove sand grains formed by sand opening by using a second polishing machine, so that the roughness of the sand grains reaches 0.4-0.6 mu m and the glossiness of the sand grains reaches 350-450 GU; driving a hard cloth wheel by a second polishing machine to further polish and remove grains, so that the roughness of the hard cloth wheel reaches 0.2-0.4 mu m and the glossiness of the hard cloth wheel reaches 500-630 GU; carrying out oil and wax removal cleaning on the hub by using hot water and a cleaning agent; further polishing diagonally by using an electric tool or a pneumatic tool to remove lines, so that the roughness of the yellow cloth strip reaches 0.1-0.3 mu m and the glossiness of the yellow cloth strip reaches 500-630 GU; and further polishing other surfaces by using a fine cloth wheel to remove grains, so that the roughness of the surface reaches 0.1-0.3 mu m and the glossiness reaches 500-630 GU. Wherein GU is English glossiness unit symbol, and μm is micrometer.
In the above step a2, the oil and wax removing treatment includes alkaline oil and wax removing or acidic oil and wax removing; alkaline deoiling wax removal includes that 5% to 10% deoiling wax removal powder or 2% to 4% alkaline deoiling wax removal agent dissolve and be used for wasing the wheel hub surface in the basin, and the aqueous solution temperature of deoiling wax removal is 35 ℃ to 45 ℃, and the pH value is PH 9 to PH 12, and deoiling wax removal is washd for a long time 3min to 4min, the medicament mass percent composition that the alkaline deoiling was removed and is received is: 3 to 5 percent of sodium carbonate, 1 to 2 percent of alkyl glycoside (APG), 1 to 3 percent of sodium hydroxide, 2 to 4 percent of sodium citrate and the balance of water; the acid oil and wax removing method comprises the steps that 2% to 3% of acid oil and wax removing agent and 15% to 20% of sulfuric acid are dissolved in a water tank and used for cleaning the surface of a hub, oil and wax are removed at normal temperature, PH is 4 to PH 5, and the oil and wax removing cleaning time is 2min to 3 min.
The specific oil removal treatment adopts alkaline oil removal; alkaline deoiling wax removal includes that 8% deoiling wax removal powder or 3% alkaline deoiling wax removal agent dissolve and be used for wasing the wheel hub surface in the basin, and the aqueous solution temperature of deoiling wax removal is 40 ℃, and the pH value is PH 11, and deoiling wax removal is washd for long 3.6min, alkaline deoiling removes the medicament mass percent composition of receiving and is: 4% of sodium carbonate, 1.6% of alkyl glycoside (APG), 2% of sodium hydroxide, 3% of sodium citrate and the balance of water; the acid oil and wax removing agent comprises 2.7% of acid oil and wax removing agent and 18% of sulfuric acid, the acid oil and wax removing agent and the sulfuric acid are dissolved in a water tank and used for cleaning the surface of the hub, oil and wax are removed at normal temperature, the pH value is 4.6, and the oil and wax removing cleaning time is 2.5 min.
In the step A3, the hub is cleaned by pure water, including a soaking cleaning mode and/or a spraying cleaning mode, the conductivity of the pure water is controlled below 10 mu s/cm, and the COD is controlled below 20 mg/L; the cleaning time of the soaking cleaning mode is 45-60 s; the cleaning time of the spray cleaning mode is 20s to 40s, and the spray pressure is 1bar to 1.5 bar.
Specifically, the conductivity of pure water was 6.75. mu.s/cm, and the COD of pure water was 16 mg/L. The soaking time is 50 s. The time of spraying and water washing is 30s, and the spraying pressure is 1.2 bar.
In the above-mentioned step a4, the cathodic electrophoresis and the curing paint film treatment include the steps of protection, pure water washing 1, electrophoresis, pure water washing 2, water blowing wiping and curing; adopting a blocking tool and an insulating paper tool to carry out protection treatment on the PCD hole of the aluminum alloy hub and the relevant part of the mounting disc; the pure water washing 1 and the pure water washing 2 adopt two modes of soaking washing in a tank and/or hanging spraying washing, wherein the soaking washing is accompanied with swing, the soaking washing time in the tank is 20s to 40s, and the hanging spraying washing time is 20s to 40 s; the temperature of electrophoresis is 28 ℃ to 32 ℃, the voltage is 120V to 160V, the pH is 5.4 to 6.6, the conductivity is 900 Mus/cm to 1200 Mus/cm, the solid content is 10 percent to 20 percent, and the cathode electrophoresis film-forming time is 0.5min to 2 min; after water is blown, the parts which do not need electrophoresis are wiped in time; drying and curing the paint film on the hub, wherein the curing temperature is 150-160 ℃, and the curing time is 20-25 min; the thickness of the cured electrophoretic paint film is 10-15 mu m; the electrophoretic paint adopts colorful transparent electrophoretic paint, and the colorful transparent electrophoretic paint comprises the following resin components in percentage by mass: 25 to 35 percent of methyl methacrylate, 15 to 20 percent of dimethylaminoethyl acrylate, 10 to 15 percent of allyl alcohol propyl ether, 2 to 4 percent of propylene glycol propyl ether, 1 to 3 percent of ethylene glycol butyl ether and 2-hydroxy-4-methoxy benzophenone.
Specifically, soaking and washing the water in the tank for 30s, and then, hanging and spraying for washing for 30 s; the hub is ensured to be cleaned evenly and cleanly; the electrophoresis adopts transparent blue electrophoretic paint, the temperature of the electrophoresis is 30 ℃, the voltage is 130V, the time is 1min, the PH is 6.2, the conductivity is 1100 mu s/cm, the solid content is 16%, the cathode electrophoresis film forming time is 1min, and the hub needs to be swung in the electrophoresis process, so that the electrophoretic paint is more uniformly deposited; after water is blown, timely wiping the parts which do not need electrophoresis, for example, wiping the areas which are not well protected or are leaked with rags with alcohol (the alcohol is slightly wrung and can not drip); and drying and curing the paint film of the hub at the curing temperature of 157 ℃ for 20 min. The thickness of the solidified electrophoresis layer is 15 mu m; the electrophoretic paint adopts colorful transparent electrophoretic paint, and the colorful transparent electrophoretic paint comprises the following resin components in percentage by mass: 25 to 35 percent of methyl methacrylate, 15 to 20 percent of dimethylaminoethyl acrylate, 10 to 15 percent of allyl alcohol propyl ether, 2 to 4 percent of propylene glycol propyl ether, 1 to 3 percent of ethylene glycol butyl ether and 2-hydroxy-4-methoxy benzophenone.
In the step A5, the transparent powder spraying and curing treatment adopts a transparent powder electrostatic spraying mode, the voltage is 50kV to 60kV, the powder output is 250g/min to 400g/min, the total air pressure is 3bar to 4bar, the curing temperature is 170 ℃ to 180 ℃, and the heat preservation time is 20min to 25 min; the film thickness of the cured transparent powder is 50-80 μm, and the transparent powder adopts an acrylic resin system and has good acid and alkali resistance and weather resistance.
Specifically, a transparent powder electrostatic spraying mode is adopted, the voltage is 55kV, the powder output is 320g/min, the total air pressure is 3.7bar, the curing temperature is 180 ℃, and the heat preservation time is 22 min; the cured transparent powder film was 73 μm thick.
Through the implementation steps, the blue transparent electrophoretic paint hub with higher gloss and excellent corrosion resistance is prepared.
In example 2:
the fine polishing treatment comprises manual sand opening, manual grinding, cleaning, automatic middle polishing and automatic fine polishing, wherein No. 120 to No. 400 abrasive paper is rolled into a cylindrical grinding head, and the cylindrical grinding head is driven to rotate by an electric and/or pneumatic tool to perform sand opening treatment on the spoke of the wheel hub and the corner part of the outer surface of the upper rim so that the roughness of the spoke of the wheel hub reaches 1-3 mu m; wrapping the 120# to 180# abrasive belts on the outer surface of a grinding disc, and driving the grinding disc to perform sand opening treatment on the outer surfaces of the spokes of the wheel hub and the upper wheel rim by using a first polishing machine to enable the roughness of the spokes and the upper wheel rim to reach 2-3 microns; manually grinding with 200# to 260# sandpaper to make the roughness reach 1.5 to 2.0 μm and the glossiness reach 80 to 160 GU; carrying out oil and wax removal cleaning on the hub by using hot water and a cleaning agent; using a vibration polishing machine and a resin grinding material to carry out automatic polishing, wherein the glossiness of the polished middle part reaches 300GU to 450 GU; and finally, performing automatic fine polishing by using a fluid polishing machine and the mixed zirconium balls, wherein the glossiness of the fine polished zirconium balls reaches 550GU to 650 GU.
The manual sand opening, manual grinding and cleaning processes are basically the same as the processing mode of the embodiment 1.
The resin abrasive material adopts conical resin abrasive material with bottom surface diameter and height of 6 mm-10 mm, and density of 1.5g/cm3And when the grain size is between 700# and 900#, the polishing time is between 25 and 45 min.
The vibration frequency of the vibration polishing machine is set to be 30Hz to 50Hz, the vibration polishing machine can drive the hub to rotate and rotate at the rotating speed of 50r/min to 70r/min, the vibration polishing machine can drive the hub to reciprocate up and down and reach 25 times/min to 35 times/min, and polishing liquid with the concentration of 2 percent to 4 percent is titrated and added during vibration polishing.
The mixed zirconium balls are zirconium balls with the diameter of 3mm to 8mm, and the density of the mixed zirconium balls is 2.8g/cm3To 3.5g/cm3The percentage of zirconium balls with the granularity of 1500# to 2000# and the diameter of 3mm is 20 percent to 30 percent, the percentage of zirconium balls with the diameter of 8mm is 30 percent to 50 percent, and the fluid fine polishing time of the mixed zirconium balls is 10min to 20min at normal temperature.
The fluid polishing machine drives the roller to rotate for 10 to 15 revolutions per minute, the fluid polishing machine drives the hub to rotate and the rotating speed reaches 50 to 70r/min, and polishing liquid with the concentration of 2 to 3 percent is added during fluid polishing.
Some of the more specific applications are as follows: the resin grinding material is a conical resin grinding material with the size of 1cm multiplied by 1cm, the middle polishing time is 30min, the equipment amplitude is 40HZ, the rotating speed of the hub is 60r/min, the hub is stretched up and down for 30 times/min in a reciprocating mode, the concentration of the polishing solution is 2%, and the polishing solution is used at normal temperature. The zirconium ball fine polishing adopts zirconium balls with the diameter of 3mm, the fine polishing time is 15min, the equipment roller autorotates for 15 r/min, the rotating speed of the wheel hub is 60r/min, the concentration of the polishing solution is 2%, and the polishing solution is used at normal temperature. The oil removal treatment adopts acidic oil removal, the acidic oil removal comprises 3 percent of acidic oil removal agent and 15 percent of sulfuric acid, the mixture is used in a preparation tank, the oil is removed at normal temperature, the pH value is 4.5, and the oil removal time is 2 min. And cleaning the hub by adopting a spray cleaning mode to clean pure water, wherein the conductivity of the pure water is 5.02 mu s/cm, and the COD of the pure water is 17 mg/L. The soaking time is 45 s. The spraying time is 30s, and the spraying pressure is 1.3 bar. The rest is the same as in example 1.
The soaking is accompanied with swinging, the time length in the tank is 30s, and the spraying time length is 30 s; the temperature of electrophoresis is 30 ℃, the voltage is 120v, the time duration is 1min, the pH is 5.6, the conductivity is 900 mu s/cm, and the solid content is 13 percent; after water is blown, the parts which do not need electrophoresis are wiped in time; the curing temperature is 160 ℃, and the curing time is 20 min; the thickness of the solidified electrophoresis layer is 11 mu m; the electrophoretic paint is transparent golden electrophoretic paint.
Adopting a transparent powder electrostatic spraying mode, wherein the voltage is 50KV, the powder output is 60, the total air pressure is 3bar, the curing temperature is 170 ℃, and the heat preservation time is 20 min; the cured transparent powder film was 60 μm thick. Of course, the temperature of electrophoresis can be controlled to be 28-32 ℃, the voltage can be controlled to be 120-160V, the electrophoresis time is 0.5-2 min, the pH is 5.4-6.6, the conductivity is 900-1200 mu s/cm, and the solid content is 10-20%;
through the implementation steps, the golden transparent electrophoretic paint hub with higher gloss and excellent corrosion resistance is prepared.
The production operation of the corresponding process is carried out on the same batch of aluminum alloy hubs by adopting the first embodiment and the second embodiment and the traditional pure electrophoresis and pure fine polishing, the glossiness and the neutral salt spray resistance (NASS) comprehensive grading are carried out on the aluminum alloy hubs after the production operation, and the comparison results are shown in the following table:
| item | Example one | Example two | Pure electrophoresis | Pure fine polishing |
| gloss/GU | 300-450 | 350-500 | 50-200 | 500-650 |
| NASS assay/h | ≥480 | ≥480 | ≥480 | ＜24 |
The foregoing summary and structure are provided to explain the principles, general features, and advantages of the product and to enable others skilled in the art to understand the invention. The foregoing examples and description have been presented to illustrate the principles of the invention and are intended to provide various changes and modifications within the spirit and scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (11)
1. The fine polishing electrophoresis combined production process of the aluminum alloy hub is characterized by comprising the following steps of: comprises the following process manufacturing steps
A1. Carrying out finish polishing treatment on the outer surfaces of the spoke and the upper rim of the aluminum alloy hub to ensure that the glossiness of the outer surfaces of the spoke and the upper rim of the aluminum alloy hub reaches 500 GU-650 GU;
A2. carrying out oil and wax removal treatment on the surface of the aluminum alloy hub, wherein the glossiness of the spoke of the aluminum alloy hub and the outer surface of the upper rim is required to be kept within the range of 500GU to 650 GU;
A3. cleaning the surface of the aluminum alloy hub treated in the steps A1 to A2 by using pure water, wherein the glossiness of the outer surface of the spoke and the outer surface of the upper rim of the aluminum alloy hub are required to be kept within the range of 500GU to 650 GU;
A4. carrying out cathode electrophoresis film forming treatment on the aluminum alloy hub by using colored transparent electrophoretic paint, and then carrying out baking and curing paint film treatment;
A5. spraying transparent powder and curing the aluminum alloy hub treated in the step A4;
A6. and obtaining the bright color surface treatment effect of the target aluminum alloy hub.
2. The aluminum alloy hub fine polishing electrophoresis combined production process as claimed in claim 1, wherein the aluminum alloy hub fine polishing electrophoresis combined production process comprises the following steps: in the step A1, the fine polishing treatment comprises manual sand opening, manual grinding, cleaning and manual fine polishing treatment, wherein No. 120 to No. 400 abrasive paper is rolled into a cylindrical grinding head, and the cylindrical grinding head is driven to rotate by an electric and/or pneumatic tool to perform sand opening treatment on the spoke of the wheel hub and the corner part of the outer surface of the upper rim so that the roughness of the spoke of the wheel hub reaches 1-1.5 mu m; wrapping the 120# to 180# abrasive belts on the outer surface of a grinding disc, and driving the grinding disc to perform sand opening treatment on the outer surfaces of the spokes of the wheel hub and the upper wheel rim by using a first polishing machine to enable the roughness of the spokes and the upper wheel rim to reach 2-3 microns; driving a hemp wheel to remove sand grains formed by sand opening by using a second polishing machine, so that the roughness of the sand grains reaches 0.4-0.6 mu m and the glossiness of the sand grains reaches 350-450 GU; driving a hard cloth wheel by a second polishing machine to further polish and remove grains, so that the roughness of the hard cloth wheel reaches 0.2-0.4 mu m and the glossiness of the hard cloth wheel reaches 500-630 GU; carrying out oil and wax removal cleaning on the hub by using hot water and a cleaning agent; further polishing diagonally by using an electric tool or a pneumatic tool to remove lines, so that the roughness of the yellow cloth strip reaches 0.1-0.3 mu m and the glossiness of the yellow cloth strip reaches 500-630 GU; and further polishing other surfaces by using a fine cloth wheel to remove grains, so that the roughness of the surface reaches 0.1-0.3 mu m and the glossiness reaches 500-630 GU.
3. The aluminum alloy hub fine polishing electrophoresis combined production process as claimed in claim 1, wherein the aluminum alloy hub fine polishing electrophoresis combined production process comprises the following steps: in the step A1, the fine polishing treatment comprises manual sand opening, manual grinding, cleaning, automatic middle polishing and automatic fine polishing, the No. 120 to No. 400 abrasive paper is rolled into a cylindrical grinding head, and the cylindrical grinding head is driven to rotate by an electric and/or pneumatic tool to perform sand opening treatment on the spoke of the wheel hub and the corner part of the outer surface of the upper rim so that the roughness of the spoke of the wheel hub reaches 1-3 mu m; wrapping the 120# to 180# abrasive belts on the outer surface of a grinding disc, and driving the grinding disc to perform sand opening treatment on the outer surfaces of the spokes of the wheel hub and the upper wheel rim by using a first polishing machine to enable the roughness of the spokes and the upper wheel rim to reach 2-3 microns; manually grinding with 200# to 260# sandpaper to make the roughness reach 1.5 to 2.0 μm and the glossiness reach 80 to 160 GU; carrying out oil and wax removal cleaning on the hub by using hot water and a cleaning agent; using a vibration polishing machine and a resin grinding material to carry out automatic polishing, wherein the glossiness of the polished middle part reaches 300GU to 450 GU; and finally, performing automatic fine polishing by using a fluid polishing machine and the mixed zirconium balls, wherein the glossiness of the fine polished zirconium balls reaches 550GU to 650 GU.
4. The aluminum alloy hub fine polishing electrophoresis combined production process as claimed in claim 3, wherein the aluminum alloy hub fine polishing electrophoresis combined production process comprises the following steps: the resin abrasive material adopts a conical resin abrasive material with the bottom surface diameter and the height of between 6 and 10mm, and the density of the conical resin abrasive material is 1.5g/cm3And when the grain size is between 700# and 900#, the polishing time is between 25 and 45 min.
5. The aluminum alloy hub fine polishing electrophoresis combined production process as claimed in claim 3, wherein the aluminum alloy hub fine polishing electrophoresis combined production process comprises the following steps: the vibration frequency of the vibration polishing machine is set to be 30Hz to 50Hz, the vibration polishing machine drives the hub to rotate, the rotating speed is 50r/min to 70r/min, the vibration polishing machine drives the hub to reciprocate up and down and reaches 25 times/min to 35 times/min, and polishing liquid with the concentration of 2 percent to 4 percent is titrated and added during vibration polishing.
6. Aluminum alloy hub fine polishing machine according to claim 3The swimming combined production process is characterized in that: the mixed zirconium ball adopts zirconium balls with the diameter of 3mm to 8mm, and the density of the mixed zirconium ball is 2.8g/cm3To 3.5g/cm3The percentage of zirconium balls with the granularity of 1500# to 2000# and the diameter of 3mm is 20 percent to 30 percent, the percentage of zirconium balls with the diameter of 8mm is 30 percent to 50 percent, and the fluid fine polishing time of the mixed zirconium balls is 10min to 20min at normal temperature.
7. The aluminum alloy hub fine polishing electrophoresis combined production process as claimed in claim 3, wherein the aluminum alloy hub fine polishing electrophoresis combined production process comprises the following steps: the fluid polishing machine drives the roller to rotate at 10-15 rpm, the fluid polishing machine drives the hub to rotate at 50-70 r/min, and polishing liquid with concentration of 2-3% is added during fluid polishing.
8. The aluminum alloy hub fine polishing electrophoresis combined production process as claimed in claim 1, wherein the aluminum alloy hub fine polishing electrophoresis combined production process comprises the following steps: in the step A2, the oil and wax removing treatment comprises alkaline oil and wax removing or acidic oil and wax removing; alkaline deoiling wax removal includes that 5% to 10% deoiling wax removal powder or 2% to 4% alkaline deoiling wax removal agent dissolve and be used for wasing the wheel hub surface in the basin, and the aqueous solution temperature of deoiling wax removal is 35 ℃ to 45 ℃, and the pH value is PH 9 to PH 12, and deoiling wax removal is washd for a long time 3min to 4min, the medicament mass percent composition that the alkaline deoiling was removed and is received is: 3 to 5 percent of sodium carbonate, 1 to 2 percent of alkyl glycoside (APG), 1 to 3 percent of sodium hydroxide, 2 to 4 percent of sodium citrate and the balance of water; the acid oil and wax removing method comprises the steps that 2% to 3% of acid oil and wax removing agent and 15% to 20% of sulfuric acid are dissolved in a water tank and used for cleaning the surface of a hub, oil and wax are removed at normal temperature, PH is 4 to PH 5, and the oil and wax removing cleaning time is 2min to 3 min.
9. The aluminum alloy hub fine polishing electrophoresis combined production process as claimed in claim 1, wherein the aluminum alloy hub fine polishing electrophoresis combined production process comprises the following steps: in the step A3, pure water is adopted to carry out hub cleaning, including a soaking cleaning mode and/or a spraying cleaning mode, the conductivity of the pure water is controlled below 10 mu s/cm, and the COD is controlled below 20 mg/L; the cleaning time of the soaking cleaning mode is 45-60 s; the cleaning time of the spray cleaning mode is 20s to 40s, and the spray pressure is 1bar to 1.5 bar.
10. The aluminum alloy hub fine polishing electrophoresis combined production process as claimed in claim 1, wherein the aluminum alloy hub fine polishing electrophoresis combined production process comprises the following steps: in the step A4, the cathodic electrophoresis and the curing paint film treatment comprise protection, pure water cleaning 1, electrophoresis, pure water cleaning 2, water blowing wiping and curing; adopting a blocking tool and an insulating paper tool to carry out protection treatment on the PCD hole of the aluminum alloy hub and the relevant part of the mounting disc; the pure water washing 1 and the pure water washing 2 adopt two modes of soaking washing in a tank and/or hanging spraying washing, wherein the soaking washing is accompanied with swing, the soaking washing time in the tank is 20s to 40s, and the hanging spraying washing time is 20s to 40 s; the temperature of electrophoresis is 28 ℃ to 32 ℃, the voltage is 120V to 160V, the pH is 5.4 to 6.6, the conductivity is 900 Mus/cm to 1200 Mus/cm, the solid content is 10 percent to 20 percent, and the cathode electrophoresis film-forming time is 0.5min to 2 min; after water is blown, the parts which do not need electrophoresis are wiped in time; drying and curing the paint film on the hub, wherein the curing temperature is 150-160 ℃, and the curing time is 20-25 min; the thickness of the cured electrophoretic paint film is 10-15 mu m; the electrophoretic paint adopts colorful transparent electrophoretic paint, and the colorful transparent electrophoretic paint comprises the following resin components in percentage by mass: 25 to 35 percent of methyl methacrylate, 15 to 20 percent of dimethylaminoethyl acrylate, 10 to 15 percent of allyl alcohol propyl ether, 2 to 4 percent of propylene glycol propyl ether, 1 to 3 percent of ethylene glycol butyl ether and 2-hydroxy-4-methoxy benzophenone.
11. The aluminum alloy hub fine polishing electrophoresis combined production process as claimed in claim 1, which is characterized in that: in the step A5, the transparent powder spraying and curing treatment adopts a transparent powder electrostatic spraying mode, the voltage is 50kV to 60kV, the powder output amount is 250g/min to 400g/min, the total air pressure is 3bar to 4bar, the curing temperature is 170 ℃ to 180 ℃, and the heat preservation time is 20min to 25 min; the film thickness of the cured transparent powder is 50-80 μm, and the transparent powder adopts an acrylic resin system and has good acid and alkali resistance and weather resistance.
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| CN114950917A (en) * | 2022-06-06 | 2022-08-30 | 贵州龙凯科技有限公司 | Multicolor high-efficiency coating process for surface of aluminum alloy hub |
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