KR101263707B1 - One body shape of emblem ＆ wheel cap, and production method of the one body shaping wheel cap - Google Patents

Abstract

The present invention includes a mold corrosion and injection molding process for etching the mold by etching the mold so that the uneven groove is formed on the top surface of the wheel cap and the emblem of the wheel cap in addition to the imprinted emblem shape; A degreasing process of removing molding powder or mold release agent and unnecessary fingerprint marks on the upper surface of the emblem and the wheel cap; Corrosion and etching process to corrode the upper surface of the stamped emblem and the wheel cap in a strong acid solution in the immersion state at 62 ℃ ~ 68 ℃ for 7 to 8 minutes to uniformly roughen the surface to improve the adhesion of the plating material; After the etching process, the water was washed to remove the etchant, and the nickel metal was deposited on the upper surface of the wheel cap by immersion for 1 to 1 minute and 30 seconds at 50 ° C to 60 ° C in an active tank containing an aqueous solution containing a palladium chloride (platinum group) colloid catalyst. A metal plating activation process of adsorbing and penetrating a catalyst of chemical plating to better deposit a conductive film of ions (Ni ⁺ ); After the metal plating activation process, nickel is deposited in a plating bath containing nickel metal ions in an aqueous solution so that the deposition of nickel plating is performed at a pH of 8.5-9.5 at 25 ° C. to 31 ° C. for 3 to 4 minutes to form a conductive film. Chemical plating process; An electroplating process of nickel which is deposited after pickling at room temperature for 2-3 minutes after the chemical plating process and performs semi-gloss plating and gloss plating; And a chromium plating process on the nickel plating, the chromium plating process is a chromium plating process while maintaining a temperature of 30 ° C ~ 55 ° C; It is done.
According to the present invention, the decorative aesthetics and functionality is maintained while modifying the expensive decorative plating form or decorative coating to meet the trend of high-end automotive wheel caps, but two to four work processes than the conventional manufacturing process Eliminating this has the economic effect of significantly reducing the manufacturing cost per wheel cap.

Description

The manufacturing method of the wheel cap plated with the emblem integrally and the wheel cap manufactured by the above method {ONE BODY SHAPE OF EMBLEM & WHEEL CAP, AND PRODUCTION METHOD OF THE ONE BODY SHAPING WHEEL CAP}

The present invention relates to a method for manufacturing a wheel cap expressing a multi-color by being provided integrally applied to the emblem and to a wheel cap manufactured by the above method, more specifically, a pattern in the wheel cap is provided integrally with the emblem installed on the wheel cover of the vehicle The emblem part for the automobile wheel cover which can improve the decorative effect and the advertisement effect by improving the manufacturing method of the wheel cap so that the shape of the emblem represented by letters, symbols, etc. and the bottom surface of the emblem shape are integrally different. It relates to a manufacturing method.

Recently, in order to satisfy various consumer's needs, not only automobile functional improvement but also design functional beauty improvement is very important. In particular, in recent years, research on each part and the entire vehicle type has been intensified to improve the functionality and aesthetics of the automobile. Among them, among the automotive parts that SMEs mainly research, the research on infinitely competing for minimizing the cost per part by reducing the manufacturing stage of the product without compromising quality or functional beauty It is true.

Emblems are sentences in which the image of a company or organization is a figure, a letter, a symbol, or a combination thereof. The emblem of a manufacturer that manufactures a product is usually attached to the surface of the product manufactured by the company. Used for advertising a product. Such emblems are made using prominent materials to ensure that the image is delivered clearly.

For example, in the case of an emblem attached to an automobile, the chrome or nickel plating is performed on a plastic or metal surface formed according to an image shape of a manufacturer.

The plating may use electroplating, chemical plating, hot dip plating, and the like, and is usually produced by electroplating or chemical plating.

However, in the case of chromium plating used for the surface processing of the emblem, there is a problem in that water pollution or soil pollution by heavy metals generated in the plating process occurs.

Furthermore, decorative tools and car wheel caps containing company logos and marks have recently been upgraded and the unit price for each component is increasing. However, there are many studies in which the decorative aesthetic is maintained while modifying the expensive decorative plating form or decorative coating to meet the trend of high-end.

However, the research to reduce the manufacturing cost per unit cost of the wheel cap is still insufficient to remove the dual process of manufacturing the wheel body and the wheel cover of the conventional wheel and bonding the two with an adhesive. In particular, wheel caps for automobiles are attached to four wheels on almost all models, and are mainly characterized by a company logo or a mark. For example, the total number of domestic production vehicles such as Hyundai / Kia Motors Co., Ltd. is 4 million, which is multiplied by four wheels, producing 16 million wheel caps. By the way, the prior art has a problem that the additional expense of the additional metal process, such as copper plating and the double metal plating process of applying a double color plating by applying the emblem is complicated to go more complicated, the present invention that solves this problem is Simply saving 500 won per wheel cap will result in an outstanding effect of saving about 8 billion won.

Therefore, the present invention has been made to solve the above-mentioned problems, in the case of the conventional car wheel cap of the double process of manufacturing the body and the emblem engraved wheel cover, respectively, and bonding the two with an adhesive (see Fig. 3) In order to improve the problem, it is intended to provide a method for manufacturing a wheel cap which is provided with an integrally expressed emblem in a dual color and the invention relating to the wheel cap manufactured by the above method. When the present invention is described in more detail, the shape of the emblem represented by a pattern, a letter or a symbol and the like on the wheel cap provided with the emblem installed on the wheel cover of the vehicle is different from the bottom surface of the shape of the emblem. After the injection molding, the upper part of the emblem and the wheel cap supporting the emblem are integrally molded, and the bottom surface on which the emblem is supported is etched and etched, and the metal plating activation process, nickel chemistry, electroplating process, and chromium plating process are used. It is intended to provide a method of manufacturing an emblem part for an automobile wheel cover which can improve a decoration effect and an advertisement effect by improving a plating method.

Hereinafter, the present invention will be described in detail.

The present invention provides a method for manufacturing an embossed wheel cap, by etching the mold so that an uneven groove is formed in the mold so that the upper surface of the wheel cap and the emblem are expressed in different colors on the upper surface of the wheel cap outside the imprinted emblem shape. Corrosion and injection molding process (S10) of the wheel cap to be injection molded, the degreasing process (S20) to remove the molding powder or mold release agent and unnecessary fingerprint marks on the upper surface of the emblem and the wheel cap, a strong acid solution Corrosion and etching step (S30) to corrode the surface evenly to improve the adhesion of the plating material by immersing in the immersion state at 62 ℃ ~ 68 ℃ 7 to 8 minutes (S30), washing with water to remove the etching material after the etching process After that, it was deposited in an active tank containing an aqueous solution containing a palladium chloride (platinum group) colloid catalyst mixed at 50 ° C. to 60 ° C. for 1 to 1 minute 30 seconds, and then the upper table of the wheel cap. A nickel metal ion metal plating activation step (S40), the metal plating activation process is the deposition of nickel plating so as rigidly done after nickel for adsorption and penetration of the catalyst in the chemical plating in order to better deposition of the conductive film of (Ni ⁺⁾ Nickel chemical plating process (S50) to form a conductive film by depositing for 3 to 4 minutes at pH 8.5-9.5, 25 ℃ ~ 31 ℃ in a plating bath containing a metal ion solution, at room temperature after the chemical plating process 2 After immersion by pickling for 3 minutes, the electroplating process of nickel to perform semi-gloss plating and gloss plating (S60), chromium plating on the nickel plating, the conditions of the chromium plating process is maintained at 30-55 ℃ After the chrome plating process (S70), after the chrome plating process, the gloss layer coating process of forming a gloss layer by coating a urethane-based resin for coating the upper surface of the wheel cap is provided with the emblem integrally (S8) It relates to a method of manufacturing a wheel cap to be plated integrally provided with an emblem comprising 0). The metal-plated conductor wheel cap is typically characterized in that the plastic or resin (樹脂), the plastic or resin can be applied to a variety of ABS, PC, Nylon, PBT, etc. Among them, automotive parts ABS resin which is easy to be molded and processed and has good heat resistance stiffness and oil resistance weather resistance of polyacrylonitrile (A), high impact resistance of polybutadiene (B) and gloss electrical property processing property of polystyrene (S) PC-ABS mixed with ABS 脂, ABS Copolymer) and PC (Polycabonate), which further enhances strength and heat resistance, is preferably used. The ABS resin is a copolymer of three copolymers of acrylonitrile (AN), butadiene (BD), and styrene (SM), and has excellent moldability, impact resistance, mechanical properties, chemical resistance, and colorability. It is widely used for parts. There are many kinds of plastics that can be injection molded in the present invention, but in order to further strengthen the properties of moldability, impact resistance, mechanical properties, chemical resistance, colorability, and the like, in ABS resins used as wheel caps for automobile parts, -It was produced using ABS resin. That is, the specific gravity of the PC-ABS resin is 1.04, the shrinkage of the molding 0.3 ~ 0.6, the softening temperature of about 100 ℃, heat deformation temperature of about 85 ℃ ~ 93 ℃. In particular, the PC-ABS resin has a higher heat resistance than polyethylene, which is a plastic material, and is particularly high at about 4.5 compared to a polyethylene having an impact resistance of 0.8. The impact resistance of these PC-ABS resins is such that they will not break even if they are hit by a hammer. Therefore, it is safe to use it as a metal substitute for industrial goods, such as an automobile parts helmet.

In addition, the method of manufacturing a wheel cap integrally provided with the emblem, the strong acid solution for etching the upper surface of the wheel cap relates to a metal coating method of the wheel cap, characterized in that the aqueous solution of sulfuric acid. The etching method includes dry etching and wet etching, but a conventional etching method corresponds to a known technique and will not be described in detail. In particular, the present invention by wet etching the upper surface of the injection molded integrally molded emblem and the wheel cap represented by the emblem is immersed in a strong acid solution at 62 ℃ ~ 68 ℃ for 7 to 8 minutes, the surface is uniformly uneven To corrode the resin surface and the like through an etching step (S30) to improve adhesion between the plating materials. In particular, the resin (plastic), as described above, the wheel cap resin is a resin copolymerized with three of Acrylonitrile (AN), Butadiene (BD), and Styrene (SM), and has moldability, impact resistance, mechanical properties, chemical resistance, and colorability. PC-ABS mixed with ABS with excellent back and PC resin with high strength and heat resistance is suitable. In the case of the ABS resin, the emblem and the upper surface are mainly composed of butadiene, which is oxidized using sulfuric acid, so that a fine surface portion is separated and a very fine uneven groove is formed in the portion, thereby causing a deformation of the surface area. There is an excellent metal plating effect to increase the adhesion of the plating on the plate, and the color of the emblem and its bottom surface is different due to the difference in the plating process in close contact by the etching process, so that the wheel cap shape and aesthetics of the present invention are excellent. .

In the configuration of the present invention, the etching process is a process of immersing and etching the butadiene of PC-ABS-based resin, which is the upper surface material of the wheel cap, in an aqueous sulfuric acid solution, wherein the upper surface of the wheel cap is etched to a thickness of 2 μm. The emblem relates to a metal plating method of the wheel cap to be integrally provided with a plate.

After the etching process, the present invention, unlike the conventional metal plating method, the copper plating process is omitted in the case of the present invention. For this reason, when the copper plating process is added, the uneven part of the fine corrosion surface expressed in the etching process is plated to fill the uneven part of the minute, thereby making it difficult to express a double color (see FIG. 4). Thus, the mold corrosion and the injection molding process of the wheel cap and the injection molding of the wheel cap to corrode the mold so that the uneven groove is formed in the mold so that the upper surface of the wheel cap and the emblem are expressed in different colors on the upper surface of the wheel cap. ) Is required. In addition, when the second nickel plating and the third chromium plating process is carried out integrally with the emblem and its bottom surface, the copper plating process is added, thereby increasing the metal plating cost and environmental pollution. Therefore, in the present invention, while reducing the plating cost and environmental pollution, in addition to the rapid double metal plating process is carried out integrally fast metal plating process has an excellent effect on large cost savings.

For example, the total number of domestically produced vehicles, including Hyundai / Kia Motors, is 4 million, and four wheels are multiplied to produce 16 million wheel caps. By the way, when a separate metal process such as copper plating is added in the wheel cap manufacturing process used in the prior art, not only the enormous cost of copper plating is added, but also the wheel cap body (body) by separately manufacturing the emblem as in the prior art of FIG. ), And the double metal plating process with double tint, the process is complicated, which entails enormous expenses such as labor cost and additional factory equipment cost, and also increases environmental pollution.

Thus, the present invention solves this problem, the manufacturing cost of the wheel cap of the present invention than the manufacturing cost of the conventional wheel cap of Figures 3, 4, 5 is 500 won per one, if about 16 million wheel caps produced about 80 An outstanding effect of saving billions can occur.

According to another aspect of the present invention, the copper plating step of the prior art is omitted, and after washing with water to remove the etchant after the etching step, 50 ° C. to 60 ° C. in an active tank containing an aqueous solution in which a palladium chloride (platinum group) colloid catalyst is mixed. Metal plating activation process (S40), which adsorbs and penetrates the catalyst of chemical plating to better deposit a conductive film of nickel metal ions (Ni ⁺ ) on the upper surface of the wheel cap by depositing for 1 to 1 minute 30 seconds at Nickel chemical plating to form a conductive coating by immersing for 3 to 4 minutes at pH 8.5-9.5, 25 ℃ to 31 ℃ in a plating bath containing nickel metal ions in an aqueous solution so that the deposition of nickel plating is firm after the activation process The process (S50) is performed, and the nickel electroplating process is performed again.

In another configuration of the present invention, the nickel electroplating step (S60) is a semi-gloss plating process of nickel using a semi-gloss agent concentration of 250-350g / l nickel sulfate, 30-60g / l nickel chloride concentration, 30 -Containing 60g / l boric acid concentration, pH 3.5-4.5, electroplating. According to another aspect of the present invention, after the semi-gloss plating process of nickel, the concentration of 250-350 g / l nickel sulfate, 30-60 g / l nickel chloride, and 30-60 g / l boric acid is maintained using a polishing agent. And the pH is 3.5-4.5. It includes a gloss plating process for electroplating. In addition, the aqueous solution to be pickled after the chemical plating process is characterized in that the washing by dipping 2-3 minutes at room temperature at pH 3.0 or less with sulfuric acid aqueous solution.

In addition, after the nickel electroplating process (S60), 150 ~ 350g / l chromic anhydride concentration, 0.5-5g / l sulfuric acid maintains a constant concentration, chromium plating process for chromium plating to a thickness of 0.5㎛ (S70) It may be configured to include.

In addition, after the chrome plating process (S70) can be configured to include a step (S80) to form a gloss layer by coating the top surface of the wheel cap that is provided with the emblem integrally PC-ABS (urethane) -based resin for coating. have.

In addition, another configuration of the present invention relates to a wheel cap integrally provided with an emblem manufactured by the method for manufacturing the wheel cap.

As described above, according to the present invention, the decorative aesthetics and functionality are maintained while modifying the expensive decorative plating form or decorative coating so as to meet the trend of high-end automotive wheel caps, but two to four more than conventional manufacturing processes are maintained. Eliminating the work process has the economic effect of significantly reducing the manufacturing cost per wheel cap. In other words, in the conventional work process of wheel caps, the wheel body and the decorative parts of the wheel cover are plated separately and bonded to each other so that two to four processes are added to the work process of the parts, and thus 500 to 1,000 won per wheel cap unit price. There was a problem of economic loss that adds a degree more, but the economic effect is excellent due to the shortening of this work process.

In addition, there is an excellent effect of maintaining the three-dimensional decorative and functional beauty in the injection molding only by the injection molding process to process the mold to distinguish the boundary between the character and the logo portion through the corrosion treatment on the surface of the injection mold before plating treatment.

1 is a flow chart related to the metal plating process of the wheel cap of the present invention with an integrated emblem,
Figure 2 is a picture of the wheel cap is integrally provided with an emblem according to the invention,
3 is a wheel cap photograph of an exploded view (a) and an assembly view (b) of disassembling the emblem according to the prior art,
4 is a photograph of a wheel cap separately plated with the prior art,
5 is a photograph of a wheel cap plated with a double emblem of the prior art.

Hereinafter, a brief description will be made of a process of applying a wheel cap for an automobile to which an emblem expressing a dual color is integrally provided and a process of manufacturing a wheel cap integrally provided with an emblem as follows.

1 to 2, the manufacturing process of the wheel cap for automobiles according to the present invention, according to the process method of Figure 1, the emblem comprising a mold corrosion and injection molding process (S10) to a gloss layer coating process (S80) The present invention relates to a metal plating method of a wheel cap which is integrally provided and plated. In the metal plating method of the wheel cap with the emblem is stamped, the wheel cap for corrosion injection molding to the mold so that the upper surface of the wheel cap and the emblem is formed in a different color on the upper surface of the wheel cap outside the stamped emblem shape And an injection molding process (S10), a degreasing process (S20) for removing molding powder or mold release agent and unnecessary fingerprint marks on the upper surface of the emblem and the wheel cap, and an upper surface of the wheel cap on which the integrally provided emblem is supported. After the etching process (S30) to improve the adhesion of the plating material by uniformly concave-convex surface by the corrosion in the immersion state at 62 ℃ ~ 68 ℃ for 7 to 8 minutes, and washed with water to remove the etching material after the etching process , Immersed in an active tank containing an aqueous solution containing a palladium chloride (Platinum group) colloid catalyst for 1 to 1 minute 30 seconds at 50 ℃ ~ 60 ℃ to the top surface of the wheel cap Metal ions (Ni ⁺⁾ of the metal plating activation step (S40), the metal plating activation process is the deposition of nickel plating so as rigidly done after nickel metal ions to adsorb and permeate the catalyst for chemical plating in order to better deposition of the conductive coating A chemical plating process of nickel (S50) to form a conductive coating by immersion for 3 to 4 minutes at pH 8.5-9.5, 25 ℃ to 31 ℃ in a plating bath contained in this aqueous solution state, 2-3 at room temperature after the chemical plating process After immersion by pickling for 5 minutes, the electroplating process of nickel to perform semi-gloss plating and gloss plating (S60), the process of chromium plating on the nickel plating, the conditions of the chromium plating process while maintaining the 30-55 ℃ After the chromium plating process (S70) and the chrome plating process (S70) to form a glossy layer by coating the upper surface of the wheel cap that the emblem is integrally coated with a PC-ABS (urethane) -based resin for coating (S80) The lure is.

In the mold corrosion and injection molding process (S10) to the process of forming a gloss layer (S80), first, simply describe the injection molding process (S10), the raw material of the PC-ABS-based resin for plating as shown in FIG. For example, after inserting the raw material of PCABS-based resin for plating into a mold engraved with a molding program corresponding to Hyundai Motor Company, a logo mark or an emblem, it can be injected by corrosion with a strong acid so that the top surface of the wheel cap is irregular as well as the logo of the stamped emblem. Corrosion and injection molding so as to form an integral wheel cap for molding and processing the body of one wheel cap with plastic, as well as the upper surface of the molded wheel cap, Hyundai Motor Company, logo mark or emblem part and the groove part due to the corrosion treatment, the It is processed by corrosion surface such as upper surface other than emblem and corrosion A forming step of forming and output drive 1 performs mold corrosion, and the injection molding process (S10). In this case, in the etching process (S30) below, the secondary coating is performed to make the metal coating adhere well. In this case, the corrosion is very finely roughened, whereas in the first mold corrosion and the injection molding process (S10), the double collar is formed. There is a difference in injection molding by etching into a larger recessed groove than a recessed groove of the secondary corrosion and etching process (S30) to form. The degreasing process (S20) is performed after the mold corrosion and injection molding process, and the degreasing process deposits and degreases the injection-molded wheel cap to remove molding powder or mold release agent and unnecessary fingerprint marks on the upper surface of the emblem and the wheel cap. Treatment conditions of the degreasing step are carried out with alkaline solution for about 3 minutes while maintaining the temperature of 30-55 ℃. The reason for this is to remove molding powder, mold release agent and unnecessary fingerprint marks on the molded product during extrusion molding and to make it hydrophilic.

Thereafter, the molded shape integrally formed is subjected to a corrosion and etching process (S30). The corrosion and etching process (S30) is a process of improving the adhesion of the plating material by uniformly unevening the upper surface of the wheel cap. In the present invention, corrosion treatment with sulfuric acid destroys butadiene of the PC-ABS-based resin for plating, and the upper surface of the wheel cap 200 is eluted to increase hydrophilicity and irregularities to a thickness of about 2 μm, thereby increasing the surface area to increase adhesion. Make it good The etching process may be performed by immersing the upper surface of the wheel cap on which the emblem is integrally provided with the etching solution in a strong acid aqueous solution at 62 ° C. to 68 ° C. for 7 to 8 minutes to uniformly uneven the surface of the plating material. Improves adhesion.

After washing to remove the etchant after the etching step (S30), the upper surface of the wheel cap was deposited for 1 to 1 minute 30 seconds at 50 ℃ ~ 60 ℃ in an active tank containing an aqueous solution containing a palladium chloride (platinum group) colloid catalyst In order to better deposit a conductive film of nickel metal ions (Ni ⁺ ) on the metal plating activation process (S40), which adsorbs and penetrates the catalyst of chemical plating, nickel plating is performed so that the deposition of nickel plating is firmly performed after the metal plating activation process. Nickel chemical plating process (S50) to form a conductive film by depositing for 3 to 4 minutes at pH 8.5-9.5, 25 ℃ ~ 31 ℃ in a plating bath containing a metal ion solution, 2 at room temperature after the chemical plating process After immersion by pickling for 3 minutes, the electroplating process of nickel to perform semi-gloss plating and gloss plating (S60), the process of chromium plating on the nickel plating, the conditions of the chromium plating process is 30-55 ℃ The chromium plating process (S70) while not.

In detail, these processes are washed again to remove the etchant after the etching process, and then the wheel cap is immersed in the activation tank for the activation treatment. The activation process of the metal plating activation process (S40) is palladium chloride which is a catalyst of chemical plating to better deposit a conductive film of nickel metal ions (Ni ⁺ ) on the upper surface of the plastic wheel cap before the nickel chemical plating process. Platinum group) adsorbing and penetrating a colloidal catalyst. The catalysis is a process for imparting a seed on the surface of the non-conductive plastic to be plated, which is a process required for the metal plating process. The activation is an acid immersion process performed immediately before plating to neutralize alkali remaining on the surface of the plastic and to make the surface active by removing the thin oxide layer generated during the previous treatment. After the plating activation process, a nickel chemical plating process is performed to form a conductive film with the nickel metal ions so that the nickel plating is firmly deposited. Then, the integrated wheel cap is washed with water to remove the liquid or foreign matter attached to the plating process, and then the nickel is electroplated after transferring the wheel cap to the electroplating line. After the nickel electroplating, the acid is rinsed to remove the oxidation, and then the semi-gloss nickel plating is first performed in order to secure more corrosion resistance. This has a problem that the shape of the wheel cap is complicated and the unevenness of plating is large because of irregularities in order to have a decorative beauty. In order to minimize the problem of the characteristics of the plating method, nickel plating is performed by the underlying plating. In particular, in the case of nickel plating, only nickel plating in the nickel plating method has a problem in that corrosion resistance is lowered and corrosion of an automobile wheel cap is easily performed. Therefore, in order to secure the gloss of the corrosion resistance, after performing semi-gloss nickel plating with excellent corrosion resistance, glossy nickel plating with excellent decoration is performed. Semi-gloss plating of the double nickel plating, first the nickel sulfate concentration of 250-350g / l, the nickel chloride concentration of 30-60g / l, the boric acid concentration of 30-60g / l, and the pH is 3.5 -It is preferable to use semi-gloss polish (Duplalux SB-A from ATOTECH) while maintaining 4.5. As for the gloss plating, the nickel sulfate concentration was 250-350 g / l, the nickel chloride concentration was 30-60 g / l, the boric acid concentration was 30-60 g / l, and the pH was 3.5-4.5. It is preferable to use a varnish for polishing (Markrolux NF Leveler, manufactured by ATOTECH) while maintaining. In this case, the plating is carried out such that the thickness of the semi-gloss nickel is 5 µm and the polished nickel is 15 µm, which is 20 µm in total. In the corrosion resistance test, one cycle was evaluated by the CASS test for 8 hours. The semi-gloss nickel 5 µm and the bright nickel 15 µm thick plating showed the evaluation of the corrosion resistance of 3 cycles and the superiority thereof was proved. When the above nickel base plating is completed, decorative plating is performed on the nickel plating. In this embodiment, chromium plating was carried out, and the thickness thereof was about 0.5 mu m. The chromium plating process carried out chromium plating, maintaining the chromic anhydride concentration 150-350g / l and the sulfuric acid concentration 0.5-5g / l, maintaining 30-55 degreeC.

In addition, the method of manufacturing a wheel cap to be plated with the emblem integrally, the strong acid solution for etching the upper surface of the wheel cap relates to a metal plating method of the wheel cap, characterized in that the aqueous solution of sulfuric acid, the etching method dry etching Although there is a wet etching, a conventional etching method is known in the art and will not be described in detail. In particular, the present invention by wet etching the upper surface of the injection molded integrally molded emblem and the wheel cap represented by the emblem is immersed in a strong acid solution at 62 ℃ ~ 68 ℃ for 7 to 8 minutes, the surface is uniformly uneven To corrode the resin surface and the like through an etching step (S30) to improve adhesion between the plating materials.

In the practice of the present invention, the copper plating process of the prior art is omitted, and the metal plating activation process (S40) is performed after the etching process. The metal plating activation process (S40) is washed with water to remove the etchant, and then immersed in an active tank containing an aqueous solution containing a palladium chloride (platinum group) colloid catalyst for 1 to 1 minute 30 seconds at 50 ℃ ~ 60 ℃ to the top of the wheel cap By adsorbing and penetrating the catalyst of chemical plating to better deposit a conductive film of nickel metal ions (Ni ⁺ ) on the surface, after the metal plating activation process, the nickel metal ion is an aqueous solution so that the deposition of nickel plating is firmly performed. The plating bath contained in the state is deposited at pH 8.5-9.5 at 25 ° C. to 31 ° C. for 3 to 4 minutes to perform a chemical plating process of nickel to form a conductive film (S50), and then performs a nickel electroplating process.

The nickel electroplating process (S60) is a semi-gloss plating process of nickel using a semi-gloss agent, the concentration of 250-350g / l nickel sulfate, the concentration of 30-60g / l nickel chloride, the concentration of 30-60g / l boric acid It is composed, including the process of electroplating, and the pH is 3.5-4.5. According to another aspect of the present invention, after the semi-gloss plating process of nickel, the concentration of 250-350 g / l nickel sulfate, 30-60 g / l nickel chloride, and 30-60 g / l boric acid is maintained using a polishing agent. And the pH is 3.5-4.5. It includes a gloss plating process for electroplating. In addition, the aqueous solution to be pickled after the chemical plating process is characterized in that the washing by dipping 2-3 minutes at room temperature at pH 3.0 or less with sulfuric acid aqueous solution. In addition, after the nickel electroplating process (S60), to maintain a constant concentration of 150-350g / l chromic anhydride, 0.5-5g / l sulfuric acid, chromium plating process for chromium plating to a thickness of 0.5㎛ (S70) After the chromium plating process, a glossy layer coating process (S80) of forming a glossy layer by coating an ABS-based resin for coating the top surface of the wheel cap having the emblem integrally formed thereon is configured.

And in order to prevent the binding and scratches, such as foreign matters, after the chromium plating process to coat the upper surface of the wheel cap is provided with the emblem integrally coating ABS (urethane) resin for coating to form a glossy layer ( S80).

The present invention is not limited to the technical spirit of the above-described specific embodiments or drawings, and those skilled in the art without departing from the gist of the present invention claimed in the claims. Various modifications are possible, of course, such changes are within the scope of the invention.

Claims (9)

In the manufacturing method of the wheel cap in which the emblem is imprinted,
A mold corrosion and injection molding process in which the top surface of the wheel cap and the top surface of the wheel cap are formed to have an uneven groove so that an uneven groove is formed in different colors;
A degreasing process of removing molding powder or mold release agent and unnecessary fingerprint marks on the upper surface of the emblem and the wheel cap;
Corrosion and etching process to corrode the upper surface of the stamped emblem and the wheel cap in a strong acid solution in the immersion state at 62 ℃ ~ 68 ℃ for 7 to 8 minutes to uniformly roughen the surface to improve the adhesion of the plating material;
After the etching process, the water was washed to remove the etchant, and the nickel metal was deposited on the upper surface of the wheel cap by immersion for 1 to 1 minute and 30 seconds at 50 ° C to 60 ° C in an active tank containing an aqueous solution containing a palladium chloride (platinum group) colloid catalyst. A metal plating activation process of adsorbing and penetrating a catalyst of chemical plating to better deposit a conductive film of ions (Ni ⁺ );
After the metal plating activation process, nickel is deposited in a plating bath containing nickel metal ions in an aqueous solution so that the deposition of nickel plating is performed at a pH of 8.5-9.5 at 25 ° C. to 31 ° C. for 3 to 4 minutes to form a conductive film. Chemical plating process;
An electroplating process of nickel which is deposited after pickling at room temperature for 2-3 minutes after the chemical plating process and performs semi-gloss plating and gloss plating; And
In the process of chromium plating on the nickel plating, the conditions of the chromium plating process is a chromium plating process while maintaining 30 ℃ ~ 55 ℃; is provided with an emblem including integrally, a method of manufacturing a wheel cap expressing a dual color. According to claim 1, wherein after the chrome plating process, the emblem is integrally provided, characterized in that to form a gloss layer by coating the urethane-based resin for coating the upper surface of the wheel cap is provided with the emblem integrally, dual color Method for producing a wheel cap to express. The method of claim 1, wherein the strong acid solution for etching the upper surface of the wheel cap is an aqueous sulfuric acid solution. The method of claim 1, wherein the etching process is a process of immersing and etching the butadiene of PC-ABS resin, which is the upper surface material of the wheel cap, in an aqueous sulfuric acid solution, wherein the upper surface of the wheel cap is etched to a thickness of 2 μm. The emblem is provided integrally, characterized in that the manufacturing method of the wheel cap expressing a dual color. The semi-gloss plating process according to claim 1, wherein the semi-gloss plating process of nickel is carried out using a semi-gloss to maintain the concentration of 250-350 g / l nickel sulfate, the concentration of 30-60 g / l nickel chloride, and the concentration of 30-60 g / l boric acid, pH is 3.5-4.5 electroplating process is provided with an emblem, characterized in that the integrally, a method of manufacturing a wheel cap expressing a double color. The method of claim 1, wherein the nickel plating process is carried out using a polishing agent to maintain the concentration of 250-350 g / l nickel sulfate, the concentration of 30-60 g / l nickel chloride, the concentration of 30-60 g / l boric acid, and the pH is Method of producing a wheel cap that is integrally provided with an emblem, characterized in that the process is electroplated 3.5-4.5. The emblem of claim 1, wherein the chromium plating process (S60) maintains a concentration of 150-350 g / l chromic anhydride and 0.5-5 g / l sulfuric acid at a constant concentration and chromium plating is chromium plated to a thickness of 0.5 µm. It is provided integrally, the manufacturing method of the wheel cap expressing a dual color. The method of claim 1, wherein the aqueous solution to pickling after the chemical plating process is a sulfuric acid aqueous solution is provided with an emblem, characterized in that the immersion by immersing 2-3 minutes at room temperature at pH 3.0 or less, the wheel cap expressing a dual color Manufacturing method. Claim 1 to claim 8, wherein the emblem is integrally provided, characterized in that produced by the method of any one of the wheel cap expressing a dual color.

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