JP6343818B2 - Method for forming plating film on stereolithography products - Google Patents

Description

  The present invention relates to a method for forming a plating film on an optically shaped product.

  There is known a stereolithographic product produced by curing and laminating epoxy resins in layers by stereolithography. Such an optically shaped product has a three-dimensional structure and is used not only as a prototype product (or master model) but also as a final product itself in recent years. For this reason, it is required to form a plating film on the surface of the stereolithographic product. In addition, even when the stereolithography product is used as a prototype of a product, it is required to form a plating film on the surface of the stereolithography product in order to produce a reality close to the final product. As a technique for forming a plating film on the surface of an optically shaped article as described above, for example, a technique described in Patent Document 1 is known.

  The technique described in Patent Document 1 includes a process A for polishing the surface of an optical modeling article using an abrasive, a process B for heating the optical modeling article, and then a synthetic resin paint colored on the surface of the optical modeling article. (Surfacer) is sprayed to make the scratches generated in the A process conspicuous, the D process to polish the surface using an abrasive finer than the A process, the E process to heat the optical modeling product, and then the optical modeling F process to spray the colored synthetic resin paint (surfacer) on the surface of the product to make the scratches generated in the D step stand out, the G step to polish the surface using a finer abrasive than the D step, and then the optical modeling product H process which forms a plating film on the surface of this is implemented.

  For this reason, according to the technique described in Patent Document 1, since the residual stress of the optical modeling product can be dissipated by heating, the residual stress of the optical modeling product is dissipated by heating during the plating film forming process (H process). No steps appear on the plating surface. In addition, even if a step or the like is generated by heating at that time, the surface is polished after spraying a synthetic resin paint (surfacer) after the heating, so that the step generated by the heating can be eliminated.

JP 2004-190099 A

  However, in the conventional method for forming a plating film on an optical modeling product, the surface of the optical modeling product is roughened by etching in order to increase the peel strength between the optical modeling product and the plating film during the plating film forming process. The epoxy resin and synthetic resin paint (surfacer), which are materials of the optical modeling product, are deteriorated by the etching solution, and there is a problem that the quality of the optical modeling product is deteriorated.

  Therefore, the present invention has been made to solve the above-described problems, and provides a plating film forming method for an optical modeling product that does not have a problem that the quality of the optical modeling product deteriorates during the plating film forming process. The purpose is to do.

[1] A plating film forming method for an optically shaped article of the present invention includes a first step of preparing an optically shaped article having a three-dimensional structure prepared by curing and laminating an epoxy-based resin into a layer by an optical shaping method; The surface of the stereolithographic product is mechanically processed to form a surface on the surface of the stereolithographic product without performing an etching step, and a second step of finishing the arithmetic average roughness Ra of the surface to a range of 0.141 μm or more. And a third step of forming a plating film by performing electroless nickel plating.

  According to the method for forming a plating film on an optical modeling product according to the present invention, since the plating film is formed by performing electroless nickel plating on the surface of the optical modeling product without performing an etching step, the conventional optical modeling product is obtained. Unlike the plating film forming method, the problem that the quality of the optically shaped article deteriorates during the plating film forming process is eliminated. In addition, in the plating film formation method to the optical modeling product of this invention, since the surface of an optical modeling product is surface-finished to predetermined surface roughness by a mechanical process at a 2nd process, it is required at a 3rd process. Without performing the etching process, the surface of the stereolithographic product can be subjected to electroless nickel plating to form a plating film.

  Further, according to the plating film forming method on the optically shaped article of the present invention, in the second step, the surface is finished in a range where the arithmetic average roughness Ra of the surface is 0.141 μm or more, so that Test Example 1 to be described later is performed. As is clear from the results, the peel strength between the optically shaped article and the plating film can be set to a predetermined value (for example, 0.5 N / cm) or more (see FIG. 2). This peel strength of 0.5 N / cm may not be a sufficient peel strength when used as a product, but is an acceptable peel strength when used as a product prototype.

  In recent years, due to the progress of optical modeling technology including improvement of epoxy resin, there is no step caused by heating. Therefore, the method for forming a plating film on the optical modeling product of the present invention is described in Patent Document 1. The process of spraying a synthetic resin paint (surfacer) every time heating, which is necessary in the case of the developed technology, is not necessarily required.

  In this specification, the arithmetic average roughness Ra is extracted from the roughness curve by the reference length in the direction of the average line, and the absolute value of the deviation from the average line of the extracted portion to the measurement curve is summed, and the average (Refer to Japanese Industrial Standards JIS B 0601.)

[2] In the method for forming a plated film on an optically shaped article according to the present invention, in the second step, it is preferable to finish the surface in a range where the arithmetic average roughness Ra of the surface is 0.458 μm or less.

  By setting it as such a method, it becomes possible to form a plating film with a good specularity so that it may become clear also from the result of the test example 2 mentioned later (refer FIG. 1).

[3] In the method for forming a plating film on an optically shaped article of the present invention, it is preferable to perform the second step using an abrasive of # 2000 or less.

  By setting it as such a method, as evident also from the result of Test Example 1 described later, the peel strength between the optically shaped article and the plating film is set to a predetermined value (for example, 0.5 N / cm) or more. (See FIG. 2).

[4] In the method for forming a plating film on an optically shaped product of the present invention, it is preferable to perform the second step using an abrasive of # 800 or more.

  By setting it as such a method, it becomes possible to form a plating film with a good specularity so that it may become clear also from the result of the test example 2 mentioned later (refer FIG. 1).

[5] In the method for forming a plated film on an optically shaped article according to the present invention, the mechanical treatment is preferably a polishing treatment, a grinding treatment, a blast treatment, or a combination thereof.

  By setting it as such a method, it becomes possible to form a plating film by performing electroless nickel plating on the surface of an optical modeling article, without performing an etching process.

  In addition, as the above-described abrasive, an abrasive such as abrasive paper, abrasive cloth, or abrasive powder can be used depending on the mechanical treatment.

[6] In the method for forming a plating film on an optical modeling product according to the present invention, in the third step, a sensitizing step of forming a coating film of a tin compound on the surface of the optical modeling product using a sol solution of tin And an activation step of adsorbing a plating catalyst made of palladium on the surface of the stereolithographic product using a solution containing palladium ions, It is preferable to apply electrolytic nickel plating.

  By setting it as such a method, it becomes possible to apply electroless nickel plating to the surface of an optical modeling article, without using a strong acid. As a result, the epoxy resin constituting the stereolithography product does not deteriorate, and it is not necessary to use a strong acid, so the burden on the environment can be reduced.

  Further, compared with the method described in [7] described later, one step can be reduced, and electroless nickel plating can be performed with high productivity.

[7] In the method for forming a plating film on an optical modeling product according to the present invention, in the third step, a sensitizing step of forming a coating film of a tin compound on the surface of the optical modeling product using a sol solution of tin And an intermediate treatment step in which a silver and silver solution is used to cause a tin and silver substitution reaction to deposit silver on the surface of the stereolithography product, and a solution containing palladium ions and silver and palladium are used. The electroless nickel plating is performed on the surface of the stereolithographic product after performing a pretreatment step including an activation step of causing a substitution reaction of the catalyst to adsorb a plating catalyst made of palladium on the surface of the stereolithography product. It is preferable to apply.

  Even with this method, it is possible to apply electroless nickel plating to the surface of the optically shaped article without using a strong acid. As a result, the epoxy resin constituting the stereolithography product does not deteriorate, and it is not necessary to use a strong acid, so the burden on the environment can be reduced.

  Moreover, the usage-amount of palladium can be reduced compared with the method as described in [6] above.

[8] In the method for forming a plating film on an optical modeling product according to the present invention, in the third step, after applying the electroless nickel plating to the surface of the optical modeling product, electrolytic plating is performed to form a composite plating film. It is preferable to form.

  By adopting such a method, it is possible to apply various electrolytic plating to the upper layer of electroless nickel plating, and therefore, the plating film forming method for the optically shaped article of the present invention can be applied to various application fields.

[9] In the method for forming a plating film on an optical modeling product according to the present invention, in the third step, it is preferable to use a brightener or a leveling agent when the electrolytic plating is performed on the surface of the optical modeling product.

  By adopting such a method, even if the arithmetic average roughness Ra of the plating film is relatively large in order to increase the anchor effect, it becomes difficult to see scratches on the surface and the appearance quality of the optical modeling product is increased. it can.

[10] In the method for forming a plating film on an optical modeling product of the present invention, the plating film may be directly formed on the surface of the optical modeling product.

[11] In the method for forming a plating film on an optical modeling product of the present invention, the plating film may be formed on the surface of the optical modeling product via a synthetic resin material as a surfacer.

It is a chart shown in order to explain the specifications of each sample used in Test Examples 1 and 2 and the results of Test Examples 1 and 2 It is a figure shown in order to demonstrate the result of Test Example 1. It is a figure shown in order to demonstrate the result of Test Example 1.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Embodiment 1]
<Method for forming plating film on stereolithography product>
The plating film forming method on the stereolithography product according to the first embodiment includes a first step of preparing a stereolithography product having a three-dimensional structure, and an arithmetic average roughness Ra of the stereolithography product surface within a range of 0.141 μm or more. It includes a second step of surface finishing and a third step of forming a plating film by applying electroless nickel plating to the surface of the stereolithographic product. Hereinafter, the method for forming a plating film on the optically shaped product according to the embodiment will be described in detail.

1. First Step The first step is a step of preparing a three-dimensional stereolithographic product produced by curing and laminating an epoxy resin in a layered manner by stereolithography. In this step, various optical modeling systems for resin can be used.

2. Second Step The second step is a step in which the surface of the stereolithographic product is surface-finished by mechanical treatment so that the arithmetic average roughness Ra of the surface is 0.141 μm or more and 0.458 μm or less. In the first embodiment, the second step is performed using an abrasive of # 2000 or less and # 800 or more. As the mechanical treatment, grinding treatment and polishing treatment are used.

3. Third Step The third step is a step of forming a plating film by performing electroless nickel plating on the surface of the stereolithographic product without performing an etching step.

  In the third step, a sensitizing step of forming a tin compound coating film on the surface of the stereolithographic product using a sol solution of tin, and palladium on the surface of the stereolithography product using a solution containing palladium ions. After performing a pretreatment process including an activating process for adsorbing the plating catalyst, electroless nickel plating is applied to the surface of the stereolithographic product. The third step is performed according to the method described in JP-A No. 2014-141712.

  In the third step, after electroless nickel plating is applied to the surface of the stereolithographic product, electrolytic plating is applied to form a composite plating film. Various electrolytic plating can be performed as the electrolytic plating. A combination of a plurality of electrolytic platings can also be performed. For example, a composite plating film can be formed by sequentially performing electrolytic copper plating, electrolytic nickel plating, and electrolytic chromium plating. In addition, a brightener and a leveling agent are used when performing electrolytic plating on the surface of the stereolithography product.

<Effect of plating film forming method on stereolithography product according to embodiment>
According to the method for forming a plating film on an optical modeling product according to Embodiment 1, since the plating film is formed by performing electroless nickel plating on the surface of the optical modeling product without performing an etching process, the conventional optical modeling is performed. Unlike the method of forming a plating film on a product, there is no problem that the quality of the optically shaped product deteriorates during the plating film forming process.

  In addition, according to the plating film forming method on the optically shaped article according to the first embodiment, in the second step, the surface is finished in a range in which the arithmetic average roughness Ra of the surface becomes 0.141 μm or more, the test described later As is clear from the results of Example 1, the peel strength between the optically shaped article and the plating film can be set to a predetermined value (for example, 0.5 N / cm) or more (see FIG. 2).

  In addition, according to the plating film forming method on the optically shaped product according to the first embodiment, in the second step, the surface is finished in a range where the arithmetic average roughness Ra of the surface becomes 0.458 μm or less, and the test described later As is clear from the results of Example 2, it is possible to form a plating film with good specularity (see FIG. 1).

  Further, according to the plating film forming method on the optically shaped article according to the first embodiment, the second step is performed using an abrasive of # 2000 or less, and as is apparent from the results of Test Example 1 described later. The peel strength between the stereolithographic product and the plating film can be set to a predetermined value (for example, 0.5 N / cm) or more (see FIG. 2).

  In addition, according to the plating film forming method for the optically shaped article according to the first embodiment, the second step is performed using an abrasive of # 800 or more, and as is apparent from the results of Test Example 2 described later. Thus, it is possible to form a plating film having a good specularity (see FIG. 1).

  Moreover, according to the plating film formation method to the stereolithography product which concerns on Embodiment 1, since a mechanical process is a grinding process and a grinding | polishing process, it is electroless on the surface of a stereolithography product, without implementing an etching process. It is possible to form a plating film by applying nickel plating.

  Moreover, according to the plating film formation method to the optical modeling article which concerns on Embodiment 1, in the 3rd process, the sensitizing which forms the coating film of a tin compound on the surface of an optical modeling article using the sol solution of tin After performing a pretreatment process including a process and an activation process for adsorbing a plating catalyst made of palladium on the surface of the optical modeling article using a solution containing palladium ions, the surface of the optical modeling article is electroless nickel Since plating is performed, it is possible to apply electroless nickel plating to the surface of the optically shaped product without using a strong acid. As a result, the epoxy resin constituting the stereolithography product does not deteriorate, and it is not necessary to use a strong acid, so the burden on the environment can be reduced.

  Moreover, according to the plating film formation method to the stereolithography product according to Embodiment 1, in the third step, after electroless nickel plating is applied to the surface of the stereolithography product, electrolytic plating is performed to form a composite plating membrane. Since various electroplating can be performed on the upper layer of the electroless nickel plating from the formation, the plating film forming method for the optically shaped article of the present invention can be applied to various application fields.

  Moreover, according to the plating film formation method to the optical modeling article which concerns on Embodiment 1, since a brightener and a leveling agent are used in the 3rd process when performing electrolytic plating on the surface of an optical modeling article, an anchor effect Even if the arithmetic average roughness Ra of the plating film is made relatively large in order to increase the thickness, it becomes difficult to see scratches on the surface, and the quality of the optically shaped article can be improved.

[Embodiment 2]
The method for forming a plating film on an optical modeling product according to Embodiment 2 basically includes the same steps as the method for forming a plating film on an optical modeling product according to Embodiment 1, but the contents of the third step are implemented. This is different from the method of forming a plating film on the optically shaped product according to the first aspect.

  That is, in the plating film forming method on the optical modeling product according to the second embodiment, in the third step, a sensitizing step of forming a tin compound coating film on the surface of the optical modeling product using a tin sol solution; An intermediate treatment step in which a silver-containing solution is used to cause a tin-silver substitution reaction to deposit silver on the surface of the stereolithography product; and a solution containing palladium ions is used to replace silver with palladium. After performing a pretreatment step including an activation step of causing a reaction to cause the plating catalyst made of palladium to be adsorbed on the surface of the stereolithographic product, electroless nickel plating is applied to the surface of the stereolithography product.

  As described above, the plating film forming method on the optical modeling product according to the second embodiment is different from the case of the plating film forming method on the optical modeling product according to the first embodiment, although the contents of the third step are different from those in the first embodiment. As in the case of the plating film forming method on the stereolithographic product, the electroplated nickel surface is formed on the surface of the stereolithography product without performing the etching step, so that the plating coating is formed. Unlike the plating film forming method, the problem that the quality of the optically shaped article deteriorates during the plating film forming process is eliminated.

  In addition, according to the plating film forming method for the optically shaped article according to the second embodiment, in the second step, the surface is finished in a range where the arithmetic average roughness Ra of the surface is 0.141 μm or more, so that a test described later is performed. As is clear from the results of Example 1, the peel strength between the optically shaped article and the plating film can be set to a predetermined value (for example, 0.5 N / cm) or more (see FIG. 2).

  In addition, according to the plating film forming method on the optically shaped article according to the second embodiment, in the second step, the surface is finished in a range where the arithmetic average roughness Ra of the surface becomes 0.458 μm or less, so that a test described later is performed. As is clear from the results of Example 2, it is possible to form a plating film with good specularity (see FIG. 1).

[Test example]
Hereinafter, the present invention will be described in more detail with reference to test examples.

[Test Example 1]
Test Example 1 is a test for clarifying the relationship between the arithmetic average roughness Ra of the surface of the optical modeling product and the peel strength between the optical modeling product and the plating film in the method of forming the plating film on the optical modeling product. It is an example.

1. Preparation of Samples Samples 1 to 19 (stereolithography products) were basically produced by the same method as the plating film forming method on the stereolithography product according to the first embodiment. Each sample was produced using an optical modeling system (model number: RM-6000) manufactured by Seamet Corporation. As a raw material resin, UV curing type epoxy resin (product number: HS-696) manufactured by ADEKA Corporation was used. Each sample is a rectangular parallelepiped having a length of 60 mm, a width of 15 mm, and a thickness of 3 mm, and the stacking pitch is 0.13 mm along the thickness direction.

  Then, the surface finishing was performed about each sample by implementing the grinding | polishing process on the conditions as described in FIG. FIG. 1 is a chart for explaining the specifications of each sample used in Test Examples 1 and 2 and the results of Test Examples 1 and 2. In FIG. 1, among the sources of the abrasive paper used in the polishing process, RC represents Riken Corundum Co., Ltd., KV represents Kovacs Co., Ltd., and ZS represents Zibo Sisha Mt Coated Abrasives Co., Ltd. (China), NK represents Nihon Kenshi Co., Ltd., FJ represents Fuji Polish Co., Ltd., SK represents Sankyo Rikagaku, and 3M represents 3M Japan.

  The arithmetic average roughness Ra of each sample was measured using a three-dimensional surface roughness measuring instrument (model number: Form Talysurf S5K, owned by Nagano Prefectural Industrial Technology Center) manufactured by Taylor Hobson, UK.

  Then, the plating film was formed in the surface of each sample by the method similar to the plating film formation method to the optical modeling article which concerns on said Embodiment 1. FIG. The plating film was formed by forming a plating film on the surface of each sample after performing a pretreatment process including a sensitizing process and an activating process. However, the plating film was formed by electroless nickel plating on the surface of each sample and then electrolytic copper plating to form a composite plating film.

2. Evaluation Method The peel strength was measured using a digital force gauge DS2-50N manufactured by Imada Corporation. First, strip-like cuts (cuts along two long sides of the rectangle and one short side) are made on the electrolytic copper-plated surface of each sample with a cutter knife until reaching the base epoxy resin. The long side of the rectangle has a length of 25 mm and the short side has a width of 8 mm. Then, several mm of the plating film is peeled off from the cut portion along one short side of the strip-shaped cut and sandwiched between the clips of the digital force gauge. Thereafter, while holding the digital force gauge in a vertical relationship with respect to each sample, the digital force gauge is slowly pulled up, and the maximum pulling force at that time is read as the peel strength.

3. Evaluation Results FIGS. 2 and 3 are diagrams for explaining the results of Test Example 1. FIG. That is, FIG. 2 shows the arithmetic average roughness Ra on the horizontal axis and the peel strength on the vertical axis, and the arithmetic average roughness Ra on the surface of the optical modeled product and the peel strength between the optical modeled product and the plating film for each sample. Are plotted. 3 shows the roughness (count) of the abrasive (in this case, abrasive paper) on the horizontal axis, the peel strength on the vertical axis, and the polishing used for the polishing process for each sample (samples 1 to 19). It is a plot of the peel strength between the paper count and the stereolithographic product and the plating film.

  From FIG. 2, it was found that as the arithmetic average roughness Ra on the surface of the optical modeling product is large, the peel strength between the optical modeling product and the plating film is large. Since Samples 1 to 17 have a peel strength of 0.5 N / cm or more, a peel strength of 0.5 N / cm or more is obtained when the arithmetic average roughness Ra of the surface of the optically shaped article is 0.141 μm or more. I found out that

  Further, FIG. 3 shows that the smaller the count of the polishing paper used in the polishing process, the higher the peel strength between the optically shaped product and the plating film. Since Samples 1 to 17 have a peel strength of 0.5 N / cm or more, a peel strength of 0.5 N / cm or more can be obtained when the count of the abrasive paper used in the polishing process is # 2000 or less. I understood.

[Test Example 2]
Test Example 2 is a test for clarifying the relationship between the arithmetic average roughness Ra of the surface of the optical modeling product and the specularity of the plating film in the method for forming the plating film on the optical modeling product of the present invention.

1. Preparation of Samples Samples 1 to 19 were basically produced by the same method as in Test Example 1. However, the plating film was formed by electroless nickel plating on the surface of each sample, and then electrolytic copper plating, electrolytic nickel plating, and electrolytic chromium plating were sequentially applied to form a composite plating film.

2. Evaluation method The specularity of the plating film was evaluated by visual evaluation by an evaluator. The evaluation criteria are as follows. That is, when the specularity of the plating film is very good (when the entire surface is a uniform mirror surface), A evaluation is given, and when the specularity of the plating film is good (partially the epoxy resin of the base is exposed) B evaluation was given to the case where the part is present), and C evaluation was given to the case where the specularity of the plating film was poor (when the finished scratch could be clearly observed). There were three evaluators, and the lowest evaluation among the three was the evaluation for the sample.

3. Evaluation result As a result of the evaluation, it was found that the smaller the arithmetic average roughness Ra of the surface of the optical modeling product, the higher the specularity of the plating film. And since samples 6-19 have A evaluation, when the arithmetic mean roughness Ra of the optical modeling article surface was 0.458 micrometer or less, it turned out that a plating film with good specularity can be formed.

  Moreover, it turned out that the mirror surface property of a plating film is so high that the count of the abrasive paper used for a grinding | polishing process is large. Since Samples 6 to 19 have an A rating, it was found that a plating film with good specularity can be formed when the count of the abrasive paper used in the polishing process is # 800 or more.

  The present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the present invention. For example, the following modifications are possible.

(1) In the first and second embodiments, the grinding process and the polishing process are used as the mechanical process, but the present invention is not limited to this. Instead of the grinding process and the polishing process, a single grinding process, a single polishing process, or a blasting process may be used.

(2) In Embodiments 1 and 2 described above, both the brightening agent and the leveling agent are used when electrolytic plating is performed, but the present invention is not limited to this. Only one of the brightener and the leveling agent may be used when the electrolytic plating is performed. Moreover, when performing electroplating, it is not necessary to use both a brightener and a leveling agent.

(3) In the said Embodiment 1 and 2, although the plating film was directly formed on the surface of the optical modeling article, this invention is not limited to this. A plating film may be formed on the surface of the stereolithographic product via a synthetic resin material as a surfacer.

Claims (11)

A first step of preparing a three-dimensional structure stereolithography product prepared by curing and laminating epoxy resins in layers by stereolithography;
A second step of surface-finishing the surface of the stereolithographic product in a range in which the arithmetic average roughness Ra of the surface is 0.141 μm or more by mechanical treatment;
A method of forming a plating film on an optical modeling product, including a third step of forming a plating film by performing electroless nickel plating on the surface of the optical modeling product without performing an etching process ,
The arithmetic average roughness Ra of the surface is extracted from the surface roughness curve by a reference length in the direction of the average line, and the absolute values of deviations from the average line of the extracted part to the measurement curve are summed, and the average A method for forming a plating film on an optically shaped article, characterized in that the arithmetic average roughness Ra (Japanese Industrial Standards JIS B 0601) is calculated .   2. The method for forming a plating film on an optically shaped article according to claim 1, wherein in the second step, the surface is finished in a range where the arithmetic average roughness Ra of the surface is 0.458 μm or less.   The method of forming a plating film on an optically shaped article according to claim 1 or 2, wherein the second step is performed using an abrasive of # 2000 or less.   The method of forming a plating film on an optically shaped article according to claim 1, wherein the second step is performed using an abrasive of # 800 or more.   The method of forming a plating film on an optically shaped article according to any one of claims 1 to 4, wherein the mechanical treatment is a polishing treatment, a grinding treatment, a blast treatment, or a combination thereof.   In the third step, a sensitizing step of forming a tin compound coating film on the surface of the stereolithographic product using a sol solution of tin, and a surface of the stereolithography product using a solution containing palladium ions The electroless nickel plating is performed on the surface of the stereolithography product after performing a pretreatment step including an activation step of adsorbing a plating catalyst made of palladium on the surface. A method for forming a plating film on an optically shaped article according to claim 1.   In the third step, a sensitizing step of forming a tin compound coating film on the surface of the stereolithographic product using a sol solution of tin, and a substitution reaction of tin and silver using a solution containing silver ions And an intermediate treatment step for depositing silver on the surface of the stereolithographic product and a substitution reaction between silver and palladium using a solution containing palladium ions to form palladium on the surface of the stereolithography product. The electroless nickel plating is performed on the surface of the stereolithographic product after performing a pretreatment step including an activation step of adsorbing a plating catalyst. A method for forming a plating film on an optically shaped product.   The said 3rd process WHEREIN: After giving the said electroless nickel plating to the surface of the said optical shaping | molding article, electrolytic plating is given and a composite plating film is formed, The one in any one of Claims 1-7 characterized by the above-mentioned. Of forming a plating film on a stereolithographic product.   The method for forming a plating film on an optical modeling product according to claim 8, wherein, in the third step, a brightener or a leveling agent is used when the electrolytic plating is performed on the surface of the optical modeling product.   The method for forming a plating film on an optical modeling product according to claim 1, wherein the plating film is directly formed on the surface of the optical modeling product.   The method for forming a plating film on an optical modeling product according to any one of claims 1 to 9, wherein the plating film is formed on a surface of the optical modeling product via a synthetic resin material as a surfacer.

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