JPH07243059A - Method for partially plating resin product - Google Patents

Abstract

PURPOSE:To provide a method for partially plating a resin product without deteriorating the appearance and capable of remarkably reducing the cost. CONSTITUTION:A grill main body 2 with an annular groove having an almost V-shaped section formed only on the designed surface side is obtained with a mold. A resist coating film layer 13 is formed on the part of the main body 2 not to be plated on the undesigned part side, and then electroless plating is applied. The bottom of the groove and the layer 13 are not plated, and an electroless plating 15 is formed on the whole other parts. The main body is then electroplated. The layer 15 formed on the part not to be plated is dissolved in an electroplating soln., and an electroplating layer 16 is formed on the layer 15 on the part to be plated. When the main body 2 is formed with the mold, one die to form the undesigned surface need not be worked to form the groove.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for partially plating a resin product in which a plating layer is formed only on a portion of the surface of a resin base material which requires plating.

[0002]

2. Description of the Related Art Conventionally, resin products of this type include exterior decorations such as front grilles and back panels for vehicles. For example, in a front grill, a plating layer is formed on a predetermined portion of the front surface (design surface) of the grill, and a coating layer is formed on a part or all of the other portion (design surface). ing. In this way, the front grill partially having the plating layer and having the coating film layer formed on at least a part of the other portions is manufactured, for example, as follows.

That is, first, a portion of the ABS resin grill body that requires plating is covered with an electroforming mask or a simple mask. Then, in that state, the resist coating is spray-applied. Then, a resist coating layer is formed on a portion where plating is unnecessary. Then, the grill body having the resist coating layer formed thereon is subjected to etching and electroless plating. Then, the electroless plating layer is formed on the portion of the surface of the grill body where the resist coating layer is not formed. Next, it is subjected to an electroplating process including a plurality of processes.
Then, an electroplating layer is formed on the electroless plating layer. That is, the plating layer including the electroless plating layer and the electroplating layer is formed only on the portion where plating is required.

Then, an unpainted portion is covered with an electroforming mask, and a predetermined coating material is applied to the other portion, that is, mainly on the resist coating layer (so-called overcoating). Then, a coating layer is formed at a desired location.

However, in the above-mentioned prior art, the resist coating layer is formed on the entire portion where plating is unnecessary regardless of whether it is the design surface or the non-design surface of the front grill. For this reason, the resist coating layer may be dissolved in the etching solution and the plating solution, and these solutions may be contaminated.

Further, since the coating film layer is formed on the resist coating film layer as described above, the resist coating film layer serves as a kind of primer. For this reason, the resist coating layer needs to have a certain durability and also has a certain adhesion to the substrate and the coating layer. Therefore, as the material of the resist coating layer that can be adopted, there is no choice but to use a material selected carefully.

As a technique for solving the above-mentioned problems, for example, a technique proposed in Japanese Patent Application No. 5-83603 by the applicant of the present application can be mentioned. With this technology,
As shown in FIG. 40, first, the step portion 10 is formed by die molding.
1, a grill main body 103 having a groove 102 formed in an annular shape is formed, and the grill main body 103 is electroless plated.
At this time, in the bottom portion 102a of the groove 102, since the gap interval is narrow, plating is not performed, and the electroless plating layer 104 is formed on all the portions except these. Next, the grill body 103 on which the electroless plating layer 104 is formed is subjected to electroplating. Then, the electroless plating layer 104 formed on the portion that does not require plating is dissolved by the electroplating solution, and in the required portion, the electroplating layer 105 is formed on the surface of the electroless plating layer 104 by energization. . In this way, the portion of the electroless plating layer 104 and the electroplating layer 105 on which the plating layer 106 is formed is covered with the electroforming mask 107, and the exposed portion is coated to form the coating layer 108.

Therefore, according to the above technique, since it is not necessary to form a resist coating layer, it is not necessary to carefully select the material of the coating layer, and a large amount of the resist coating layer is contained in the etching solution or the plating solution. It also eliminates the risk of melting. Further, since the parting portion of the boundary portion between the plating layer 106 and the coating layer 108 can be formed linearly, it is possible to significantly improve the appearance quality.

[0009]

However, in the above technique, both the design surface and the non-design surface of the grill main body 103, which is the base material, are required when at least some plating is required on both the design surface and the non-design surface. The above groove 10
2 had to be formed. In other words, it is necessary to form the protrusions for forming the groove 102 on both the die member for forming the design surface and the die member for forming the non-design surface. Here, in order to form the groove 102 in such a shape that the electroless plating layer 104 is not formed on the bottom portion 102a of the groove 102, it is quite difficult to easily process and form the convex groove, and the mold is The cost required for processing had risen significantly. As a result, the cost of the die having the above-mentioned ridges is significantly higher than the cost of the die having no ridges (for example, about 1.
More than 5 times).

The present invention has been made to solve the above problems, and an object thereof is a method of partial plating of a resin product in which a plating layer is formed only on a portion requiring plating, and appearance quality Another object of the present invention is to provide a method for partially plating a resin product, which is capable of achieving a significant cost reduction without causing a decrease in

[0011]

In order to achieve the above object, in the first aspect of the present invention, the boundary line between the portion requiring plating and the portion not requiring plating is formed on the surface of the resin base material. , A groove forming step of forming a groove having a substantially V-shaped cross section on the design surface side so as to form an annular shape or a part of an annular shape, and plating on the non-design surface side of the base material surface Resist coating layer forming step of forming a resist coating layer so as to form a ring or a part of a ring so as to surround a portion not requiring plating or a portion not requiring plating, and a bottom portion of the groove on the surface of the base material. And an electroless plating step of forming an electroless plating layer on a portion other than the resist coating layer, and electrically conducting the electroless plating layer formed on the substrate through the electroless plating step, Plating on the electroless plating layer That an electroplating process for forming an electroplating layer on the necessary portion is set to its gist.

Further, in the second invention, a groove having a substantially V-shaped cross section is formed in the boundary line between the portion requiring plating and the portion not requiring plating on the surface of the resin base material. Groove formation in which a die is formed so as to form an annular shape or a part of an annular shape only on the design surface side, and a simple groove is formed by a die so as to form an annular shape or a part of an annular shape only on the non-design surface side A step, a resist layer forming step of forming a resist layer along the simple groove, and an electroless plating step of forming an electroless plating layer at the bottom of the groove and a portion other than the resist layer on the surface of the base material. An electroplating step of electrically connecting the electroless plating layer formed on the base material that has undergone the electroless plating step to form an electroplating layer on a portion of the electroless plating layer where plating is required. The summary of having It is.

Further, in the third aspect of the present invention, a groove having a substantially V-shaped cross section is formed in the boundary line between the portion requiring plating and the portion not requiring plating on the surface of the resin base material. A groove forming step of forming with a mold so as to form an annular shape or a part of an annular shape only on the design surface side, and an electroless plating method for forming an electroless plating layer on a portion of the base material surface other than the bottom portion of the groove. For the electroless plating layer formed on the non-designed surface side of the plating step and the base material surface, a cut portion is continuously formed so as to form a ring or a part of a ring so as to surround a portion that does not require plating. And a notch forming step to electrically connect the electroless plating layer formed on the base material that has undergone the notch forming step to form an electroplating layer on a portion of the electroless plating layer where plating is required. And an electroplating process Has as its gist that.

In addition, in the fourth aspect of the invention, a groove having a substantially V-shaped cross section is formed in the boundary line between the portion requiring plating and the portion not requiring plating on the surface of the resin base material. Is formed by a mold so as to form an annular shape or a part of an annular shape only on the design surface side, and the convex stripe is formed by a mold so as to form an annular shape or a part of an annular shape only on the non-design surface side. Groove ridge forming step, electroless plating step of forming an electroless plating layer on a portion other than the bottom of the groove on the surface of the base material, and the non-electrolytic plating formed on the base material after the electroless plating step. Of the electroplating layer, a cutting removal step of cutting or removing the electroless plating layer formed on the convex strip, and an electroless plating layer formed on the base material that has undergone the cutting removal step are electrically Of the plating on the electroless plating layer. Is the gist that a electroplating process for forming an electroplating layer in a portion.

In addition, in the fifth aspect of the present invention, a simple groove is provided only on the design surface side at the boundary between the portion requiring plating and the portion not requiring plating on the surface of the resin base material. A simple groove forming step of forming with a mold so as to form an annular shape or a part of an annular shape, a resist layer forming step of forming a resist layer along the simple groove, and plating on the non-design surface side of the base material surface. A resist coating film layer forming step of forming a resist coating film layer so as to form a ring or a part of a ring so as to surround a portion not requiring plating or a portion not requiring plating, the resist layer and the resist coating film An electroless plating step of forming an electroless plating layer on a portion other than the layer, and electrically conducting the electroless plating layer formed on the base material that has undergone the electroless plating step, and the electroless plating layer Is the gist that a electroplating process for forming an electroplating layer on necessary portions of the plating.

Further, in the sixth invention, a simple groove is formed in an annular shape or a part of an annular shape in a boundary line portion between a portion requiring plating and a portion not requiring plating on the surface of the resin base material. A simple groove forming step of forming with a mold to form a resist layer, a resist layer forming step of forming a resist layer along the simple groove, and an electroless plating method of forming an electroless plating layer on a portion other than the resist layer. Electricity for electrically connecting the step and the electroless plating layer formed on the base material that has undergone the electroless plating step to form an electroplating layer on a required portion of the electroless plating layer for plating. The point is that it has a plating process.

Further, in the seventh aspect of the invention, a simple groove is formed only on the design surface side at the boundary line between the portion requiring plating and the portion not requiring plating on the surface of the resin base material. Alternatively, a simple groove forming step of forming with a mold so as to form a part of an annular shape, a resist layer forming step of forming a resist layer along the simple groove, and an electroless plating layer on a portion other than the resist layer. Electroless plating step to form, with respect to the electroless plating layer formed on the non-designed surface side of the substrate surface, a cut portion to form a ring or a part of a ring so as to surround a portion that does not require plating. A notch forming step of continuously forming and electrically conducting the electroless plating layer formed on the base material that has undergone the notch forming step, and electrically connecting the electroless plating layer to a necessary portion for plating. Me That an electroplating process to form a layer which as its gist.

In addition, in the eighth aspect of the invention, a simple groove is provided only on the design surface side in the boundary line between the portion requiring plating and the portion not requiring plating on the surface of the resin base material. A groove groove ridge forming step of forming the ridge with a mold so as to form an annular shape or a part of an annular shape and forming the ridge with a mold so as to form an annular shape or a part of an annular shape only on the non-design surface side A resist layer forming step of forming a resist layer along the simple groove, an electroless plating step of forming an electroless plating layer on a portion other than the resist layer, and a step of forming on the base material after the electroless plating step Of the electroless plating layer formed, a cutting removal step of cutting or removing the electroless plating layer formed on the ridge, and the electroless plating formed on the base material that has undergone the cutting removal step. To make the layers electrically conductive That an electroplating process for forming an electroplating layer on necessary portions of the plating on the electroless plating layer is set to its gist.

In addition, in the ninth aspect of the invention, a simple groove is provided only on the design surface side in the boundary line between the portion requiring plating and the portion not requiring plating on the surface of the resin base material. A groove formed by a die so as to form an annular shape or a part of an annular shape, and a groove having a substantially V-shaped cross section formed by a die so as to form an annular shape or a part of an annular shape only on the non-design surface side. Forming step, a resist layer forming step of forming a resist layer along the simple groove, and an electroless plating step of forming an electroless plating layer on the bottom of the groove and a portion other than the resist layer on the surface of the base material. And electroplating for electrically conducting the electroless plating layer formed on the base material that has undergone the electroless plating step to form an electroplating layer on a portion of the electroless plating layer that requires plating. The key is to have a process It is set to.

[0020]

According to the first aspect of the present invention, in the groove forming step, a cross section is formed at the boundary line between the portion requiring plating and the portion not requiring plating on the surface of the resin base material. The substantially V-shaped groove is formed by a mold so as to form a ring or a part of a ring only on the design surface side. Further, in the resist coating layer forming step, the resist coating film is formed so as to form a ring or a part of a ring so as to surround the whole portion not requiring plating or the portion not requiring plating on the non-design surface side of the substrate surface. A layer is formed. Next, in the electroless plating step, the electroless plating layer is formed on the bottom surface of the groove and the portion other than the resist coating layer on the surface of the base material. Then, in the electroplating step, the electroless plating layer formed on the base material that has undergone the electroless plating step is electrically conducted, and the electroplating layer is formed on a portion of the electroless plating layer where plating is required. It

Here, in the above electroless plating step, the electroless plating layer is not formed on the bottom of the groove and the resist coating layer. Therefore, in the electroplating step, the portion requiring plating is electrically conducted to form the electroplating layer on the portion requiring plating on the electroless plating layer.

According to the present invention, the groove having a substantially V-shaped cross section is formed by the mold. However, since the groove may be formed only on the design surface side of the product, As for the processing of the mold for forming the groove, only one mold may be processed. Therefore, it is not necessary to form a groove having a substantially V-shaped cross section in order to partially plate the non-design surface of the product. Therefore, the processing of the mold is simplified accordingly.

Even if the parting of the boundary portion of the plating on the non-designed surface side deteriorates to some extent depending on how the resist coating layer is applied, the non-designed surface side is less visible from the outside. On the other hand, on the design surface side, the presence of the groove having a substantially V-shaped cross section provides a good partitioning of the plating. Therefore,
It is avoided that the overall appearance quality is degraded.

According to the second aspect of the invention, in the groove forming step, the cross-section is substantially V-shaped at the boundary line between the portion requiring plating and the portion not requiring plating on the surface of the resin base material. Similarly, the letter-shaped groove is formed in the mold so as to form an annular or annular part only on the design surface side, and the simple groove forms an annular or annular part only on the non-design surface side. It is formed by a mold. Further, in the resist layer forming step, the resist layer is formed along the simple groove. Next, in the electroless plating step, an electroless plating layer is formed on the bottom of the groove and the portion other than the resist layer on the surface of the base material. Then, in the electroplating step, the electroless plating layer formed on the base material that has undergone the electroless plating step is electrically conducted, and the electroplating layer is formed on a portion of the electroless plating layer where plating is required. It

Therefore, also in the present invention, although there is a difference between the resist coating layer of the first invention and the resist layer and the simple groove which is easily formed, the same effect as that of the first invention is exhibited. . Further, since the resist layer can be formed along the simple groove, the resist layer can be easily formed,
And it can be performed with high accuracy.

Further, according to the third aspect of the invention, in the groove forming step, the cross-section is substantially cut at the boundary between the portion requiring plating and the portion not requiring plating on the surface of the resin base material. The V-shaped groove is formed by a mold so as to form a ring or a part of a ring only on the design surface side. Also,
In the electroless plating step, the electroless plating layer is formed on the surface of the base material other than the bottom of the groove. Then, in the notch forming step, with respect to the electroless plating layer formed on the non-design surface side of the base material surface, the notches are continuous so as to form a ring or a part of a ring so as to surround a portion that does not require plating. Is formed. And in the electroplating process,
The electroless plating layer formed on the substrate that has undergone the notch forming step is electrically conducted, and an electroplating layer is formed on a portion of the electroless plating layer where plating is required.

Therefore, also in the present invention, although there is a difference between the resist coating layer of the first invention and the cut portion after the electroless plating step, the same effect as that of the first invention is exhibited. Also, the use of resist paint can be omitted.

In addition, according to the fourth aspect of the present invention, in the surface of the base material made of resin, the boundary line portion between the portion requiring plating and the portion not requiring plating is formed in the groove groove forming step. , A groove having a substantially V-shaped cross section is formed by a mold so as to form an annular portion or an annular portion only on the design surface side, and the convex portion forms an annular portion or an annular portion only on the non-design surface side. It is formed by a mold so as to form it. In the electroless plating step, the electroless plating layer is formed on the surface of the base material other than the bottom of the groove. Next, in the cutting and removing step, of the electroless plating layers formed on the base material that has undergone the electroless plating step, the electroless plating layer formed on the ridges is cut or removed. And in the electroplating process,
The electroless plating layer formed on the substrate that has undergone the cutting and removing step is electrically conducted, and the electroplating layer is formed on a portion of the electroless plating layer where plating is required.

Therefore, also in the present invention, there is a difference between the formation of the resist coating film layer of the first invention and the formation of the ridges and the removal of the electroless plating layer on the ridges by cutting.
The effect is almost the same as that of the invention.

In addition, according to the fifth aspect of the invention, in the simple groove forming step, the boundary line between the portion requiring plating and the portion not requiring plating is formed on the surface of the resin base material. The simple groove is formed by a mold so as to form a ring or a part of a ring only on the design surface side. Further, in the resist layer forming step, the resist layer is formed along the simple groove. Next, in the resist coating layer forming step, the resist coating is formed so as to form a ring or a part of a ring so as to surround the entire surface of the non-designed surface of the base material that does not require plating or surround the portion that does not require plating. A membrane layer is formed. Further, in the electroless plating step, the electroless plating layer is formed on the portion other than the resist layer and the resist coating layer. Then, in the electroplating step, the electroless plating layer formed on the base material that has undergone the electroless plating step is electrically conducted, and the electroplating layer is formed on a portion of the electroless plating layer where plating is required. It

Here, in the above electroless plating step, the electroless plating layer is not formed on the resist layer and the resist coating layer. Therefore, in the electroplating step, the portion requiring plating is electrically conducted to form the electroplating layer on the portion requiring plating on the electroless plating layer.

According to the present invention, no groove having a substantially V-shaped cross section is formed, and a simple groove may be formed on the design surface side. Therefore, it is not necessary to process the die for forming the groove. Therefore, the first to the fourth
Compared with the invention described above, the processing of the mold is further simplified.

Further, even if the parting of the boundary portion of the plating on the non-designed surface side is slightly deteriorated depending on how the resist coating layer is applied, the non-designed surface side is not easily visible from the outside. On the other hand, on the design surface side, due to the existence of the simple groove and the resist layer, the parting off of the plating becomes good. Therefore, it is possible to prevent the appearance quality from being deteriorated as a whole.

According to the sixth aspect of the invention, in the simple groove forming step, a simple part of the surface of the resin substrate is bordered between the portion requiring plating and the portion not requiring plating. The groove is formed in a mold so as to form a ring or a part of a ring. Further, in the resist layer forming step, the resist layer is formed along the simple groove. Further, in the electroless plating step, the electroless plating layer is formed on the portion other than the resist layer. Then, in the electroplating step, the electroless plating layer formed on the base material that has undergone the electroless plating step is electrically conducted, and the electroplating layer is formed on a portion of the electroless plating layer where plating is required. .

Therefore, also in the present invention, although there is a difference between the resist coating layer of the fifth invention and the resist layer and the simple groove which is easily formed, the same effect as that of the fifth invention is exhibited. . Further, since the resist layer can be formed along the simple groove, the resist layer can be easily formed,
And it can be performed with high accuracy.

Further, according to the seventh invention, in the simple groove forming step, a simple process is performed on the boundary line between the portion requiring plating and the portion not requiring plating on the surface of the resin base material. The groove is formed by a mold so as to form a ring or a part of a ring only on the design surface side. Further, in the resist layer forming step, the resist layer is formed along the simple groove. Further, in the electroless plating step, the electroless plated layer is formed on the portion other than the resist layer. Next, in the notch forming step, with respect to the electroless plating layer formed on the non-design surface side of the base material surface, the notches are continuous to form a ring or a part of a ring so as to surround a portion that does not require plating. Formed. Then, in the electroplating step, the electroless plating layer formed on the base material that has undergone the notch forming step is electrically conducted, and the electroplating layer is formed on the required portion of the electroless plating layer for plating. It

Therefore, also in the present invention, although there is a difference between the resist coating layer of the fifth invention and the cut portion after the electroless plating step, the same effect as that of the fifth invention is exhibited. Also, the use of resist paint can be omitted.

In addition, according to the eighth invention, in the groove groove ridge forming step, the boundary line portion between the portion requiring plating and the portion not requiring plating on the surface of the resin base material. In addition, the simple groove is formed in the mold so as to form an annular shape or a part of an annular shape only on the design surface side, and the ridge forms a part of an annular shape or an annular shape only on the non-design surface side. Formed in. Further, in the resist layer forming step, the resist layer is formed along the simple groove. further,
In the electroless plating step, the electroless plated layer is formed on the portion other than the resist layer. Next, in the cutting and removing step, of the electroless plating layers formed on the base material that has undergone the electroless plating step, the electroless plating layer formed on the ridges is cut or removed. Then, in the electroplating step, the electroless plating layer formed on the base material that has undergone the cutting and removing step is electrically conducted, and the electroplating layer is formed on a portion of the electroless plating layer where plating is required. It

Therefore, also in the present invention, there is a difference between the formation of the resist coating film layer of the fifth invention and the formation of the ridges and the cutting and removal of the electroless plating layer on the ridges.
The effect is almost the same as that of the invention.

In addition, according to the ninth aspect of the invention, in the groove forming step, the boundary line between the portion requiring plating and the portion not requiring plating is simply formed on the surface of the resin base material. The groove is formed by a die so as to form an annular shape or a part of an annular shape only on the design surface side, and the groove having a substantially V-shaped cross section forms an annular shape or an annular part only on the non-design surface side. It is formed by a mold. Further, in the resist layer forming step, the resist layer is formed along the simple groove.
Next, in the electroless plating step, an electroless plating layer is formed on the bottom of the groove and the portion other than the resist layer on the surface of the base material. Then, in the electroplating step, the electroless plating layer formed on the base material that has undergone the electroless plating step is electrically conducted, and an electroplating layer is formed on a portion of the electroless plating layer where plating is required. To be done.

According to the present invention, the groove having a substantially V-shaped cross section is formed by the mold, but the groove may be formed only on the non-design surface side of the product. As for the processing of the mold for forming the groove, only one mold may be processed. Therefore, it is not necessary to form a groove having a substantially V-shaped cross section in order to perform partial plating on the design surface side of the product. Therefore, the processing of the mold is simplified accordingly.

On the other hand, on the design surface side, due to the presence of the simple groove and the resist layer, the plating cut-off is approximately V in cross section.
It is almost as good as the case of the letter-shaped groove. Therefore,
It is avoided that the overall appearance quality is degraded. So far

[0043]

【Example】

(First Embodiment) A first embodiment in which the present invention is embodied in a vehicle front grill 1 as a resin product will be described with reference to FIGS.
It will be described based on 5.

A front grill 1 as shown in FIG. 2 is mounted on the front surface of the vehicle. As shown in FIGS. 1 to 3 and FIG. 6, the front grill 1 is made of ABS.
A front grill body (hereinafter referred to as a grill body) 2 as a resin base material is provided, and a plating layer 3 formed on a part of the front surface (design surface) and the back surface (non-design surface) 3 (A portion indicated by a mesh in FIG. 3), a coating layer 4 applied and formed on a portion other than the plating layer 3 on the design surface side, and a resist applied and formed on a portion other than the plating layer 3 on the non-design surface side. It has the resist coating film layer 13 as a layer. More specifically, the front grill 1
Is a frame 5 having a substantially rectangular front shape, a plurality of sub-partition plates 6 extending in the horizontal direction within the frame 5, a plurality of connecting plates 7 extending in the vertical direction within the frame 5, and a mark plate (not shown) in the central portion. Mounting plate 8 and frame 5 for mounting
It has a main partition plate 9 extending from to the mounting plate 8. The plating layer 3 is formed mainly on the design surface side portion of the frame 5 and on the design surface side portion of the main partition plate 9. In addition, the sub partition plate 6, the mounting plate 8
The coating layer 4 is formed on the design surface side portion of the connecting plate 7.

FIG. 4 is an enlarged front view showing a part (α portion in FIG. 3) of the main partition plate 9, and FIG. 5 is an AA line in FIG.
It is a line sectional view. As shown in these figures and FIG. 1, in the design surface side portion of the grill body 2, at the boundary portion between the plating layer 3 and the coating layer 4, the frame 5 and the main partition plate 9 project in the vertical direction. The step portion 10 is formed in an annular shape. The stepped portion 10 is formed with a groove 11 having a substantially V-shaped cross section in an annular shape (closed curved shape) (see FIG. 3).

On the other hand, FIG. 1 is a view showing the rear surface side (non-design surface side) of the front grill 1 and is a sectional view showing a β portion in FIG. On part of the non-design surface of the grill body 2,
A plating layer 3 extending from the design surface side is formed, and a resist coating layer 13 is formed on the other portions. In addition, on the back side portion of the grill body 2,
An electrode projection (not shown) is integrally formed so as to project in the rear surface direction (vehicle rear direction).

As shown in FIG. 6, the plating layer 3 comprises an electroless plating layer 15 and an electroplating layer 16. In this embodiment, the electroless plating layer 15 is made of nickel and has a thickness of about 0.3 to 0.4 μm. The electroplating layer 16 has a thickness of “20 to 50 μm”.
m ”and is formed of various metals in the order of a strike plating layer, a copper plating layer, a semi-bright nickel plating layer, a bright nickel plating layer, and a chrome plating layer (none of which are shown) made of nickel. There is.

The various plating solutions for forming the respective metal platings forming the electroplating layer 16 will be described. The plating solution for forming the strike plating layer is nickel sulfate 250 g / L, nickel chloride 30.
It contains 30 g / L of g / L and boric acid. The plating solution for forming the copper plating layer contains 200 g / L of copper sulfate, 50 g / L of sulfuric acid, 0.01 g / L of hydrochloric acid, and a slight amount of brightening agent. Furthermore, the plating solution for forming the semi-bright nickel plating layer contains 280 g / L of nickel sulfate, 45 g / L of nickel chloride, 40 g / L of boric acid, and a slight amount of brightening agent. In addition, the plating solution for forming the bright nickel plating layer is nickel sulfate 240 g / L,
It contains 45 g / L of nickel chloride, 30 g / L of boric acid, and a trace amount of brightening agents and additives. In addition, the plating solution for forming the chromium plating layer is chromic anhydride 250
g / L, sodium silicofluoride 10 g / L, sulfuric acid 1 g /
It contains L.

Further, as shown in FIG. 6, the bottom portion 11a of the groove 11 is microscopically curved for convenience of molding. Further, in this embodiment, the radius of curvature r1 of the cross-sectional shape of the bottom portion 11a is less than "0.1 mm".

Regarding the size of the groove 11, for example, the width W is "0.5 mm" and the depth D is "0.7 mm". However, the width W is not particularly limited,
It is preferably "0.3 mm" or more because of processing restrictions, and "1.0 mm" or less is preferable in order to improve the design.
The depth D is also not particularly limited, but is preferably “0.3 mm” or more due to the processing limitation. Further, in this embodiment, the ratio of the depth D to the width W (D / W) is larger than “1.0”, and the following equation (1) D / W> 0.18 * r1 + 1.0. ... (1) is satisfied.

Next, the mold 21 for molding the grill body 2 will be described. FIG. 7 is a cross-sectional view showing a portion of the mold 21 for forming a part of the main partition plate 9 on the design surface side, and FIG. 8 is a non-design surface of the frame 5 of the grill body 2. It is sectional drawing which shows the part which forms a part of side. As shown in these drawings, the mold 21 includes a fixed mold 22 and a movable mold 23. A cavity 24 for molding the grill body 2 is formed by these two molds 22 and 23. However, as shown in FIG. 7, in the present embodiment, a protrusion 25 for forming the groove 11 is integrally formed on a portion of the movable die 23 for forming the design surface side. ing. On the other hand, as shown in FIG. 8, such a convex strip 25 is not formed mainly on the fixed die 22 for forming the non-designed surface side.

Next, a method of manufacturing the above-mentioned front grill 1 and an operation and effect in manufacturing will be described. First, the cavity 2 is formed by a known mold forming method.
Molten ABS resin is injected and filled in the container 4 (see FIGS. 7 and 8). After the resin is cooled and solidified, both molds 22 and 23 are opened and the grill body 2 is taken out. At this time, the two molds 22 and 23 are opened parallel to the mold opening direction, that is, in the direction in which the protrusions 26 and the like are removed. Therefore, the protrusion 2
The mold opening is not hindered by 6 or the like, and the grill body 2 can be easily taken out. In this way
The grill main body 2 in which the groove 11 is formed in an annular shape at a predetermined position on the design surface side is obtained.

Subsequently, resist coating is applied to the grill body 2 described above. That is, as shown in FIG. 9, first, the electroformed mask 26 is coated on the portions to be partially plated on the design surface side and the non-design surface side where the resist coating is unnecessary. That is,
The electroformed mask 26 is a metal plate having a thickness of “several mm” and has a shape conforming to the shape of the front grill 1. Further, the electroformed mask 26 is appropriately formed with an opening 26a which is opened only in a portion necessary for forming the resist coating layer 13. Therefore, by covering the electroformed mask 26, the portion of the non-designed surface side where resist coating is required is exposed. Then, a resist coating is applied toward the exposed portion by, for example, spray coating. By this coating, a resist coating layer 13 as shown in the figure is formed on the exposed portion.

Next, the grill body 2 on which the resist coating layer 13 is formed is immersed in an electroless plating solution to perform electroless plating. At this time, as shown in FIG. 10, the plating solution does not reach the bottom 11a of the groove 11 because the gap is narrow. Therefore, the bottom portion 11a is not plated. Further, as shown in FIG. 11, the portion where the resist coating layer 13 is formed is not plated. In other words, the electroless plating layer 15 is formed on all parts of the surface of the grill body 2 except the bottom part 11a and the part where the resist coating layer 13 is formed.

Further, as shown in FIGS. 1 and 12, the grill body 2 on which the electroless plating layer 15 is formed is subjected to electroplating. More specifically, this electroplating process includes a plurality of processes such as a strike plating process, a copper plating process, a semi-bright nickel plating process, a bright nickel plating process, and a chrome plating process. That is, the main body 2
While being dipped a plurality of times in each of the predetermined electroplating solutions described above, and electrically in the plating solution, the portions that require plating (mainly the front side portion of the frame 5 and the front side portion of the main partition plate 9) are electrically plated. Make it conductive. At this time, the electrode projection formed on the rear surface side portion of the grill body 2 serves as one electrode.

Then, the electroless plating layer 15 formed on the portion not requiring plating is dissolved by the electroplating solution. Further, the electroplating layer 16 having the above-described multilayer structure is formed on the surface of the electroless plating layer 15 in the portion requiring plating. On the other hand, since the electroless plating layer 15 is not originally formed on the resist coating layer 13 on the non-designed surface side, the electroplating layer 16 is not formed on the resist coating layer 13. In this way, the grill main body 2 in which the electroless plating layer 15 and the electroplating layer 16 (plating layer 3) are formed only in the portion requiring plating can be obtained.

Thereafter, as shown in FIG. 13, the plating layer 3
The portion on which is formed is covered with the electroforming mask 27.
This electroformed mask 27 is also similar to the electroformed mask 26 described above.
The shape conforms to the shape of the front grill 1. Further, the electroforming mask 27 is appropriately formed with an opening portion 27a which is opened only in a portion necessary for forming the coating layer 4.
By covering the electroformed mask 27, a portion necessary for forming the coating layer 4 is exposed from the opening 27a. Then, as shown in FIG. 14, spray coating is applied toward the exposed portion. By this coating, the coating film layer 4 is formed on the required portions of the coating film.

After the coating layer 4 is formed, the coating of the electroformed mask 27 is released to obtain the front grill 1 as shown in FIGS. That is, the frame 5
Has a plating layer 3 mainly on the design surface side portion and on the design surface side portion of the main partition plate 9, the sub partition plate 6, the mounting plate 8
Further, the front grill 1 having the coating film layer 4 mainly on the design surface side portion of the connecting plate 7 and having the resist coating film layer 13 on the portion of the non-design surface where the plating layer 3 is not formed is obtained. .

According to this embodiment, when the electroless plating layer 15 is formed, the electroless plating layer 15 is not formed on the bottom portions 11a of the grooves 11 and the resist coating layer 13. Therefore, when the electroplating layer 16 is formed, only the portion requiring plating is electrically conducted. That is, the electroless plating layer 15 formed in the portion that does not require plating is dissolved by the electroplating solution. Also, in the parts that require plating,
The electroplated layer 16 having the above-described multilayer structure is formed on the surface of the electroless plated layer 15. Therefore, at this stage, the grill main body 2 in which the plating layer 3 is surely formed only in the necessary portion can be obtained. Therefore, when forming the coating layer 4, it is possible to directly form the coating layer 4 on the grill main body 2 without interposing the primer layer.

On the design surface side of the front grill 1, the coating layer 4 is directly applied and formed on the grill body 2. Therefore, the thickness of the portion is reduced by the amount that the plating layer 3 and the primer layer are not interposed. As a result, the thickness of the coating film layer 4 portion can be reduced, and the appearance quality can be improved.
Further, since the coating layer 4 and the grill body 2 are both made of a resin material, the coating layer 4 can be firmly bonded to the grill body 2. Therefore, the durability of the coating layer 4 of the front grill 1 can be improved.

In addition, in this embodiment, the groove 1 on the design surface side is also provided.
1 is the boundary between the coating layer 4 and the plating layer 3. For this reason, the parting portion of the boundary portion is clearly formed instead of the zigzag shape. As a result, the parting line can be made clear and clear, and further, the appearance quality can be further improved.

In addition, in this embodiment, the front grill 1
The resist coating layer 13 is formed only on the non-design surface side by forming the groove 11 on the design surface side. Therefore, the coating area can be reduced as compared with the case where the resist coating layer 13 is formed on both the design surface and the non-design surface. Therefore, the amount of the resist coating layer 13 dissolved in the plating solution in various plating steps can be reduced. As a result, the degree of contamination of the plating solution can be reduced.

Further, in this embodiment, since the groove 11 having a substantially V-shaped cross section needs to be formed only on the design surface side of the front grill 1, the die 21 for forming the groove 11 is formed. As for the processing, it may be applied only to the die (movable die 23) on one side. That is, it is only necessary to form the convex stripe 25 for forming the groove 11 only on the movable die 23. Therefore, it is not necessary to form a groove having a substantially V-shaped cross section in order to partially plate the non-design surface side of the front grill 1. Therefore, the processing of the mold 21 is simplified accordingly. as a result,
It is possible to significantly reduce the cost for processing the die 21.

Furthermore, in this embodiment, the resist coating layer 13 is applied only to the non-designed surface side of the grill body 2, so that it is assumed that the resist coating layer 13 is formed in a zigzag pattern. Even if the parting off of the plating boundary portion on the non-design surface side deteriorates to some extent, the non-design surface side is less visible to the outside. On the other hand, on the design surface side, the plating layer 3 and the coating layer 4 are provided due to the existence of the groove 11 having a substantially V-shaped cross section.
The separation between and becomes good. Therefore, it is possible to prevent the appearance quality from being deteriorated as a whole.

Further, the additional effect of this embodiment will be described. That is, in order to investigate the influence of the shape of the groove 11 when forming the plated layer 3, the following experiment was conducted. In this experiment, the ratio of the depth D to the radius of curvature r1 and the width W of the curved section of the bottom 11a of the groove 11 (D /
When W) is variously changed, it is determined whether or not the plating layer 3 can be reliably formed only in the portion requiring plating. The results will be described below.

The grill body 2 was formed by variously changing the radius of curvature r1 of the curved portion of the bottom portion 11a of the groove 11 and the ratio of the depth D to the width W (D / W). In order to determine whether or not partial plating on the grill body 2 is possible,
The graph of FIG. 15 was created based on the above two parameters. In the figure, white circles indicate that the plated layer 3 could be reliably formed only in the portion requiring plating. Further, the black circles indicate that the plating layer 3 could not be formed only in the portion requiring plating. This failure is
This is because the electroless plating layer 15 is formed on the bottom portion 11a of the groove 11, or the electroless plating layer 15 is formed on both sides of the groove 11 so as to straddle the groove.

As shown in the figure, in the present embodiment, both of the above requirements (r1 ≦ 1.0 and D / W> 0.18 *
When r1 + 1.0) was satisfied, the plating layer 3 could be reliably formed only in the portion requiring plating. On the other hand, if either one of the above requirements was not satisfied, it was not possible to form the plating layer 3 only on the portion requiring plating.

If the above-mentioned requirements for groove formation are satisfied, it is not necessary to form the bottom 11a of the groove 11 in a strictly acute cross-section. Therefore, the protrusion 26 of the mold 21 for forming the bottom portion 11a can be processed without any difficulty. Further, when the protrusion 26 is formed in a strict acute angle shape, there is a problem that the durability of the protrusion 26 is deteriorated and breakage or the like is likely to occur, but in the present embodiment, this problem may occur. Absent. As a result, when molding the grill main body 2 having the groove 11 having the above-described shape, the difficulty in molding is reduced, and it is possible to suppress an increase in manufacturing cost.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIGS. However,
In the second embodiment, the description of the same parts as those of the first embodiment will be omitted, and the differences will be mainly described.

As shown in FIG. 16, in the second embodiment, the resist coating layer is not formed on the entire non-designed portion of the grill body 2 on the non-designed surface side.
It is significantly different from the first embodiment. That is, first,
A grill main body 2 similar to that of the first embodiment using the mold 21.
To get Then, a band-shaped (or linear) resist coating layer 31 is formed in a closed curve so as to surround only the boundary between the plated portion and the non-plated portion, that is, the non-plated portion.

Next, the grill main body 2 on which the strip-shaped resist coating layer 31 is formed is immersed in an electroless plating solution,
Apply electroless plating. At this time, similarly to the above, the bottom portion 11a of the groove 11 and the portion where the resist coating layer 31 is formed are not plated. In other words, the electroless plating layer 15 is formed on all parts except the bottom part 11a on the surface of the grill body 2 and the part where the resist coating film layer 31 is formed.

Further, the grill body 2 on which the electroless plating layer 15 is formed is subjected to electroplating. Then, as shown in FIG. 17, the electroless plating layer 15 formed in the portion that does not require plating is dissolved by the electroplating solution. Further, in a portion requiring plating, the electroplating layer 1 having a multilayer structure is formed on the surface of the electroless plating layer 15.
6 is formed. On the other hand, the resist coating layer 3 on the non-design surface side
1 and the portion surrounded by the resist coating layer 31 are not electrically conducted, the electroplating layer 16 is not formed. Even in this case, the grill body 2 in which the electroless plating layer 15 and the electroplating layer 16 (plating layer 3) are formed only in the portion where plating is required can be obtained almost similarly to the first embodiment.

According to this embodiment, basically, the first
The same effect as that of the embodiment is obtained. Further, unlike the first embodiment in which the resist coating layer 31 is formed on the entire surface of the non-designed surface that is not plated, the belt-shaped resist coating layer 31 is formed by coating so as to surround the non-plated portion. I decided to do it. Therefore, the amount of the resist coating film layer 31 (resist paint) used as a whole can be further reduced. As a result, the effect of reducing the amount of the resist coating dissolved in the plating solution in the various plating steps described in the first embodiment can be made more remarkable. As a result, the degree of contamination of the plating solution can be further reduced.

(Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIGS. However,
In the third embodiment, the description of the same parts as those of the first and second embodiments will be omitted, and the differences will be mainly described.

As shown in FIG. 18, in the third embodiment, on the non-designed surface side of the grill main body 32 as the base material, at the boundary between the portion where the plating layer 3 is formed and the portion where the plating layer 3 is not formed, The simple groove 33 having a substantially U-shaped cross section is formed in a closed curve shape, and the resist layer 34 is formed along the simple groove 33 at the bottom 33a of the simple groove 33. It is significantly different from the embodiment. The width and depth of the simple groove 33 are not particularly limited as long as they can be easily processed and formed.
It is desirable that it is about "mm".

Next, the mold 35 for molding the grill main body 32 will be described. FIG. 19 is a cross-sectional view showing a part of the mold 35 that forms a part of the frame of the grill body 32 on the non-design surface side. As shown in the figure, the mold 35 includes a fixed mold 36 and a movable mold 37. A cavity 38 for molding the grill main body 32 is formed by these molds 36 and 37. However, as already described in the first embodiment, in the portion for forming the design surface side of the movable die 37, the ridge 25 for forming the groove 11 (not shown in this figure). Etc. are integrally formed. On the other hand, as shown in FIG. 19, such a pointed ridge 25 is not formed in the portion for forming the non-designed surface side. Instead,
The fixed die 36 is formed with a simple ridge 39 for forming the simple groove 33. In addition, this simple ridge 39
Can be formed more easily in terms of mold processing than the ridge 25 on the design surface side.

Next, the operation and effects of this embodiment will be described. First, as in the first embodiment, the ABS resin melted is injected and filled in the cavity 38 (see FIG. 19). Once the resin has cooled and solidified,
Both molds 36 and 37 are opened, and the grill main body 32 is taken out. Thus, as shown in FIG. 20, the groove 11 is formed in an annular shape at a predetermined position on the design surface side (not shown), and
The grill main body 32 in which the simple groove 33 is formed in an annular shape at a predetermined position on the non-design surface side is obtained.

Then, a resist layer 34 is formed on the grill main body 32. That is, as shown in FIG. 21, for example, a bottom portion 33 of the simple groove 33 is provided along the simple groove 33 by using an injector 40 containing a resist coating inside.
Inject resist paint into a. Then, on the bottom portion 33a of the simple groove 33, the resist layer 34 is continuously formed in an annular shape along the simple groove 33.

Next, the grill body 32 having the resist layer 34 formed thereon is dipped in an electroless plating solution to perform electroless plating. At this time, as shown in FIG. 22, the bottom 11a of the groove 11 and the portion where the resist layer 34 is formed are not plated. In other words, the electroless plating layer 15 is formed on all portions except the bottom portion 11a and the resist layer 34 on the surface of the grill body 2.

Further, the grill main body 32 on which the electroless plating layer 15 is formed is subjected to electroplating. Then, FIG.
As shown in, the electroless plating layer 15 (the two-dot chain line portion in the figure) formed in a portion that does not require plating is dissolved by the electroplating solution. Further, the electroplating layer 16 having a multi-layer structure is formed on the surface of the electroless plating layer 15 in the portion requiring plating. On the other hand, the resist layer 34 on the non-designed surface side and the portion surrounded by the resist layer 34 are not electrically connected to each other, so that the electroplating layer 16 is not formed. Even in this case, the grill main body 32 in which the electroless plating layer 15 and the electroplating layer 16 (plating layer 3) are formed only in the portion where plating is required is performed in the same manner as in the first and second embodiments. can get.

According to this embodiment, basically, the first
The same effect as that of the embodiment is obtained. Further, according to the present embodiment, unlike the first embodiment in which the resist coating film layer 31 is formed on the entire surface of the non-designed surface that is not plated, the resist layer 34 is formed so as to surround the portion that is not plated. Was formed by injection. Therefore, the amount of the resist coating used as a whole can be reduced. As a result, as in the second embodiment, the effect of reducing the amount of the resist layer 34 (resist coating material) dissolved in the plating solution in the plating step can be made more remarkable. As a result, the degree of contamination of the plating solution can be further reduced.

When the resist layer 34 is formed by injection, the resist coating material may be injected along the simple groove 33. Therefore, the resist layer 34 can be easily formed. Further, it is possible to prevent the resist layer 34 from being distorted and formed, and the resist layer 34 can be formed with high accuracy. That is, even on the non-designed surface, it is possible to make a good parting off of the plating.

(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described with reference to FIGS. However,
In the fourth embodiment, the description of the same parts as those of the first to third embodiments will be omitted, and the differences will be mainly described.

As shown in FIG. 27, in the fourth embodiment, the resist coating is not applied to the non-designed surface side of the grill body 2 used in the first embodiment. Is very different from.

That is, first, using the mold 21, a grill main body 2 similar to that of the first embodiment is obtained as shown in FIG. Next, the grill body 2 is immersed in an electroless plating solution to perform electroless plating. At this time, similarly to the above, the bottom portion 11a of the groove 11 is not plated. In other words, the electroless plating layer 15 is formed on all portions of the surface of the grill body 2 except the bottom portion 11a. Therefore, as shown in FIG. 25, the electroless plating layer 15 is formed on the entire surface of the grill body 2 on the non-design surface side.

Then, using a cutting tool 41 as shown in the figure, an annular cut is made at the boundary between the portion to be plated and the portion not to be plated. Then, as shown in FIG. 26, the notch 42 is formed in an annular shape in the electroless plating layer 15 on the non-designed surface side.

Further, the grill main body 2 having the notches 42 formed on the electroless plating layer 15 is subjected to electroplating. Then, as shown in FIG. 27, the electroless plating layer 15 formed in the portion that does not require plating is not electrically conducted, so that the electroplating layer 16 is not formed and is dissolved by the electroplating solution. Further, the electroplating layer 16 having a multi-layer structure is formed on the surface of the electroless plating layer 15 in the portion requiring plating. Even in this case, the grill body 2 in which the electroless plating layer 15 and the electroplating layer 16 (plating layer 3) are formed only in the portion where plating is required can be obtained almost similarly to the first embodiment.

According to this embodiment, basically, the first
The same effect as that of the embodiment is obtained. Further, unlike the first to third embodiments in which the resist coating is applied or injected on the non-designed surface side, the electroplating layer 16 is formed by forming the notch 42 in the electroless plating layer 15 with the cutting tool 41.
The electrical conduction during formation was cut off. For this reason,
Since no resist coating is used, the plating solution can be prevented from being contaminated, and the cost can be reduced.

(Fifth Embodiment) Next, a fifth embodiment of the present invention will be described with reference to FIGS. However,
In the fifth embodiment, the description of the same parts as those of the first to fourth embodiments will be omitted, and the differences will be mainly described.

As shown in FIG. 31, the fourth embodiment is significantly different from the first to third embodiments in that no resist coating is used on the non-designed surface side of the grill main body 52 as a base material. ing. Further, similarly, on the non-design surface side of the grill main body 52, a convex strip 53 having a substantially U-shaped cross section is continuously and annularly formed at a boundary portion between a portion to be plated and a portion not to be plated. It is significantly different from the fourth embodiment.

That is, first, a predetermined mold (not shown)
And a groove 11 similar to that of the first embodiment is used on the design surface side.
As shown in FIG. 28, the grill main body 52 on which the ridges 53 are formed is obtained on the non-design surface side. Next, the grill body 52 is immersed in an electroless plating solution to perform electroless plating. At this time, like the above, the bottom portion 11 of the groove 11 is
No plating is applied to a. In other words, the electroless plating layer 15 is formed on all portions of the surface of the grill body 2 except the bottom portion 11a (on the convex strip 53). Therefore, as shown in FIG. 29, the electroless plating layer 15 is formed on the entire non-design surface side of the grill body 52.

Subsequently, as shown in FIG. 30, the electroless plating layer 15 formed on the ridges 53 is cut using a predetermined cutting tool. Further, the grill main body 52 in which the electroless plating layer 15 on the ridge 53 is cut is subjected to electroplating. Then, as shown in FIG. 31, since the electroless plating layer 15 formed in the portion that does not require plating is not electrically conducted, the electroplating layer 16 is not formed and is dissolved by the electroplating solution. Further, the electroplating layer 16 having a multi-layer structure is formed on the surface of the electroless plating layer 15 in the portion requiring plating. Even in this case, the grill main body 52 in which the electroless plating layer 15 and the electroplating layer 16 (plating layer 3) are formed only in the portion where plating is required is almost the same as in the first embodiment.
Is obtained.

According to this embodiment, basically, the first
The same effect as that of the embodiment is obtained. Further, unlike the first to third embodiments in which the resist coating is applied or injected on the non-designed surface side, the electroless plating layer 15 on the ridge 53 is cut to form the electroplating layer 16. The electrical continuity of is cut off. Therefore, as in the fourth embodiment, it is possible to prevent the plating solution from being contaminated and reduce the cost.

The present invention is not limited to the above-described embodiments, but may be implemented as follows with a part of the structure appropriately changed without departing from the spirit of the invention. (1) In the first to fifth embodiments, the grill bodies 2 and 3
On the design surface side of 2, 52, the groove 1 having a substantially V-shaped cross section
However, instead of the groove 11, the simple groove 63 may be formed on the design surface side of the grill main body 62, as shown in FIG. 32. That is, first, as shown in FIG. 33, a grill main body 62 having an annular simple groove 63 on the design surface side is obtained. At this time, the non-designed surface side can adopt any one of the configurations from the above-described first to fifth embodiments.

Then, as shown in FIG. 34, the simple groove 63
A resist coating is injected into the bottom portion 63a of the groove along the simple groove 63 to form a resist layer 64 in an annular shape. Next, the grill body 62 is immersed in an electroless plating solution to perform electroless plating. At this time, the resist layer 64 is not plated on the design surface side. In other words, FIG.
As shown in FIG. 5, the electroless plating layer 15 is formed on all portions except the resist layer 64 on the design surface side of the grill body 62. Then, the grill main body 62 on which the electroless plating layer 15 is formed is subjected to electroplating. Then, as shown in FIG. 36, the electroless plating layer 15 formed in the portion that does not require plating is not electrically conducted, so that the electroplating layer 16 is not formed and is dissolved by the electroplating solution. Further, the electroplating layer 16 having a multi-layer structure is formed on the surface of the electroless plating layer 15 in the portion requiring plating.

However, in passing through the above series of steps,
On the non-design surface side of the grill main body 62, it is necessary to appropriately perform any one of the processes of the above-described first to fifth embodiments.

Thereafter, as shown in FIG. 32, the plating layer 3
The coating layer 4 is formed by applying the coating to the portion where the film is not formed. In this case, the resist layer 64 is the simple groove 63.
The plating layer 3 is formed inside the groove, and is cut off inside the simple groove 63. For this reason, the boundary between the plating layer 3 and the coating layer 4 is as good as that when it is cut off by the groove, and a good cutoff is obtained, and the appearance quality is not significantly deteriorated.

As described above, the simple groove 63 is formed without forming the groove 11 having a substantially V-shaped cross section on the design surface side of the grill main body 62.
Is formed, and the first side on the non-design surface side
-Each configuration described in the fifth embodiment may be adopted. In such a case, the groove 11 may not be formed on the design surface side in addition to the effects described in the first to fifth embodiments. Therefore, the processing of the mold is further simplified. As a result, it is possible to further reduce the cost when processing the die.

Alternatively, the simple groove 63 may be formed on the design surface side of the grill main body 62, and the groove 11 having a substantially V-shaped cross section may be formed on the non-design surface side. That is, the configurations of the design surface side and the non-design surface side of the third embodiment may be reversed. Even in such a case, the processing of the mold can be simplified.

(2) In the other example (1), the resist layer 64 is formed by injecting the resist paint into the bottom portion 63a of the simple groove 63. However, as shown in FIG. The resist layer 65 may be formed in a substantially strip shape by applying (spraying, etc.) a resist coating along the line. In such a configuration, the coating layer 4 is overcoated on the resist layer 65, so that the appearance quality is not deteriorated at all and the same effect as that of the another example (1) is obtained. .

(3) In the second embodiment, the resist layer 34 is formed by injecting the resist coating material into the simple groove 33 formed on the non-designed surface side. As described above, the resist coating may be applied along the simple groove 33 (spray application, etc.) to form a substantially belt-shaped resist layer.

(4) In the fourth embodiment, the cutting tool 4 is used for the electroless plating layer 15 formed on the non-design surface side.
1 is used to form the annular notch 42 at the boundary between the portion to be plated and the portion not to be plated, but using the grill main body 32 having the simple groove 33 as shown in FIG. You may make a notch like this. That is, the grill main body 32 having the simple groove 33
The electroless plating layer 15 is formed on the
Make a notch using. With such a configuration, it is possible to easily perform the work of making a notch and with high accuracy. When the non-design surface side has such a configuration, the design surface side may have a configuration using the simple groove 63 as shown in the other examples (1) and (2). .

(5) In the first to fifth embodiments and other examples (1) to (4), the groove 11, the resist coating layer 31, the simple groove 33, and the resist layers 34, 64 are used. ，
65, the notch 42, the ridge 53, etc. are all formed in an annular shape only on the design surface side on the design surface side or on the non-design surface side on the non-design surface side, but this is not always the case. Good. That is, for example, as shown in FIG. 39, one closed curve may be formed by the groove 11 on the design surface side and the simple groove 33 on the non-design surface. That is, the groove 11 and the resist coating layer 31
Alternatively, the simple groove 33, the resist layers 34, 64, 65, the notch 42, the ridge 53, and the like may be combined in various ways to form one closed curve. In this case, the groove 11, the resist coating layer 31, and the simple groove 33
The resist layers 34, 64, 65 and the cutout 42.
In addition, the ridges 53 and the like form a part of an annular shape.

(6) Although the present invention is embodied in the vehicle front grille 1 in each of the above-described embodiments and other examples, in addition to that, for example, an outer cover for a vehicle door mirror bracket,
It may be embodied in a back panel for a vehicle, a louver for a vehicle, a pillar garnish for a vehicle, a quarter vent for a vehicle, a mark plate for a vehicle, and the like. Further, the present invention is not limited to the above resin products, and the present invention may be embodied in other resin products having a plating layer and a coating layer.

(7) In each of the above embodiments and other examples, the resin material constituting the base material is made of ABS resin, but in addition to this, for example, polypropylene, polyphenylene oxide, polyamide, polysulfone,
Various resin materials such as polyester may be used.

(8) In each of the above embodiments and other examples, the electroless plating layer 15 is formed of nickel, but it may be formed of copper or the like in addition to the nickel. Further, in each of the examples and the other examples, the electroplating layer 16 is formed of three kinds of metals of copper, nickel and chromium so as to form a multilayer structure, but a metal other than these may be used, Moreover, you may embody when it does not make it a multilayer structure.

(9) In each of the above embodiments and other examples,
In particular, the coating layer 4 may not be formed. (10) In each of the above-mentioned embodiments and other examples, the electroless plating layer 15 in a portion where plating is unnecessary is dissolved by using a predetermined solution (for example, an aqueous ammonia solution) before forming the strike plating layer. You may do it. In this case, the unnecessary electroless plating layer 15 is prevented from being dissolved in the plating solution in the subsequent electroplating step, and the contamination of the plating solution can be prevented in advance. The technical idea which is not described in each claim of the claims and which can be grasped from the above-described embodiment will be described below together with its effect.

(A) The coating layer is formed on the portion where the plating layer is not formed after the partial plating according to the first to ninth aspects. With such a structure, a good separation between the coating layer and the plating layer can be achieved.

(B) In the partial plating method according to the third and seventh aspects, the cut portion is formed along the simple groove previously formed in the above description. With such a configuration, it is possible to easily perform the work of making a notch and with high accuracy.

(C) In the partial plating method according to any one of claims 1 to 5, the radius of curvature r1 of the curved section of the bottom of the groove is less than 0.1 mm, and the width of the groove. The depth D to W ratio is characterized by satisfying the following formula ratio (D / W)> 0.18 * r1 + 1.0.

With such a structure, the partial plating can be surely applied, the die can be further simplified, and the difficulty in forming the base material can be reduced.

[0112]

As described in detail above, according to the present invention,
In a partial plating method for a resin product in which a plating layer is formed only on a portion that requires plating, there is an excellent effect that the appearance quality is not deteriorated and the cost can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a part of a front grille on a non-design surface side in a first embodiment embodying the present invention.

FIG. 2 is a front view showing a front grill in the first embodiment.

FIG. 3 is a diagram showing a plated portion of the front grille in the first embodiment, and is a schematic diagram in which the front grille is developed on the front surface and the back surface.

FIG. 4 is an enlarged front view showing a part of a main partition plate of the front grille in the first embodiment.

5 is a sectional view taken along the line AA of FIG. 4 in the first embodiment.

FIG. 6 is a partial cross-sectional view showing a part of the main partition plate of the front grill on the design surface side in the first embodiment.

FIG. 7 is an enlarged sectional view showing a part of a mold for molding the design surface side of the grill body in the first embodiment.

FIG. 8 is a cross-sectional view showing, in an enlarged manner, a part of a metal mold for molding the non-designed surface side of the grill body in the first embodiment.

FIG. 9 is a partial cross-sectional view showing a state in which a resist coating layer is formed on the non-design surface side of the grill body in the first embodiment.

FIG. 10 is a partial cross-sectional view on the design surface side showing a state in which electroless plating is applied to the grill body in the first embodiment.

FIG. 11 is a partial cross-sectional view on the non-design surface side showing a state in which electroless plating is applied to the grill body in the first embodiment.

FIG. 12 is a partial cross-sectional view on the design surface side showing a state in which electroplating is applied to the grill body having the electroless plating layer formed therein in the first embodiment.

FIG. 13 is a partial cross-sectional view showing a state in which an electroformed mask is covered on a portion where a plating layer is formed on the design surface side of the grill body in the first embodiment.

FIG. 14 is a partial cross-sectional view showing a state in which a coating layer is formed on the design surface side of the grill body with the electroformed mask covered in the first example.

FIG. 15 shows whether or not plating can be partially performed when the grill body is formed by variously changing the radius of curvature and the ratio of the depth to the width of the curved section of the bottom of the groove in the first embodiment. It is a graph which shows the result of having determined.

FIG. 16 is a partial cross-sectional view showing a state in which a belt-shaped resist coating layer is formed on the non-design surface side of the grill body in the second embodiment of the present invention.

FIG. 17 is a partial cross-sectional view on the non-design surface side showing a state in which electroplating is applied to the grill body having the electroless plating layer formed therein in the second embodiment.

FIG. 18 is a partial cross-sectional view showing a part of the non-designed surface side of the front grill in the third embodiment of the present invention.

FIG. 19 is an enlarged cross-sectional view showing a part of a die for forming a grill body in the third embodiment.

FIG. 20 is a cross-sectional view showing the non-design surface side of the grill body in the third embodiment.

FIG. 21 is a cross-sectional view showing a state in which a resist layer is formed in the simple groove on the non-designed surface side of the grill body in the third embodiment.

FIG. 22 is a cross-sectional view on the non-designed surface side of the grill body showing a state where electroless plating is performed in the third embodiment.

FIG. 23 is a cross-sectional view of the non-design surface of the grill body showing a state where electroplating is performed in the third embodiment.

FIG. 24 is a cross-sectional view showing a non-design surface side of a grill main body according to a fourth embodiment of the present invention.

FIG. 25 is a cross-sectional view on the non-design surface side of the grill body showing a state immediately after making a notch with a cutting tool after the electroless plating layer is formed in the fourth example.

FIG. 26 is a cross-sectional view on the non-design surface side of the grill body showing a state in which a cut portion is formed in the electroless plating layer in the fourth example.

FIG. 27 is a cross-sectional view of the grille body on the non-designed surface side showing a state in which electroplating is performed after the notches are formed in the fourth example.

FIG. 28 is a cross-sectional view showing a portion of a ridge on the non-design surface of the grill body in the fifth embodiment of the present invention.

FIG. 29 is a cross-sectional view on the non-design surface side of the grill body showing a state in which an electroless plating layer is formed in the fifth example.

FIG. 30 is a cross-sectional view of the grill main body on the non-design surface side in a state where the electroless plating layer on the ridge is removed in the fifth example.

FIG. 31 is a cross-sectional view on the non-design surface side of the grill body showing a state where electroplating is performed in the fifth example.

FIG. 32 is a partial cross-sectional view showing a part of the main partition plate on the design surface side of the front grille in another embodiment of the present invention.

FIG. 33 is a partial cross-sectional view showing a part of the main partition plate on the design surface side of the grill body in another embodiment.

FIG. 34 is a partial cross-sectional view showing a state in which a resist layer is formed in the simple groove on the design surface side of the grill body in another embodiment.

FIG. 35 is a partial cross-sectional view on the design surface side of the grill body showing a state in which electroless plating is applied to the grill body having a resist layer formed thereon in another example.

FIG. 36 is a partial cross-sectional view on the design surface side of the grill body showing a state where electroplating is performed in another example.

FIG. 37 is a partial cross-sectional view on the design surface side of the front grill when a resist layer is formed in the simple groove and the vicinity thereof in yet another example.

FIG. 38 is a cross-sectional view of the grill main body on the non-design surface side, showing a state in which a simple groove and a notch formed by a cutting tool are combined in yet another embodiment.

FIG. 39 is a front view of a front grill showing a case where a simple groove or the like forms a part of an annular shape in yet another embodiment.

FIG. 40 is an enlarged cross-sectional view showing a part of the design surface side of the front grill in the related art.

[Explanation of symbols]

1 ... Front grille as a resin product, 2, 32, 5
2, 62 ... (Front) grill body as a base material, 3 ...
Plating layer, 11 ... Strip groove, 11a ... Bottom part, 15 ... Electroless plating layer, 16 ... Electroplating layer, 21, 35 ... Mold, 1
3, 31 ... Resist coating layer, 33, 63 ... Simple groove, 3
4, 64, 65 ... Resist layer, 42 ... Cut portion, 53
… Convex.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location C25D 5/56 A

Claims (9)

[Claims] 1. A groove (11) having a substantially V-shaped cross section is designed in a boundary part between a portion requiring plating and a portion not requiring plating on the surface of a resin base material (2). Mold (21) so as to form a ring or a part of a ring only on the surface side
And forming a ring or a part of a ring so as to surround the entire surface of the non-designed surface of the base material (2) or the portion that does not require plating. A resist coating film layer forming step of forming a resist coating film layer (13, 31) on the substrate, and a bottom portion (11) of the groove (11) on the surface of the base material (2).
a) and an electroless plating step of forming an electroless plating layer (15) on a portion other than the resist coating layer (13, 31), and formed on the base material (2) after the electroless plating step Electrically conducting the electroless plating layer (15),
An electroplating step of forming an electroplating layer (16) on a portion of the electroless plating layer (15) that needs to be plated. 2. A groove (11) having a substantially V-shaped cross section is designed at a boundary line between a portion requiring plating and a portion not requiring plating on the surface of a resin base material (32). The mold (3
5) and a groove forming step of forming the simple groove (33) with a mold (35) so as to form an annular shape or a part of an annular shape only on the non-design surface side; and the simple groove (33) A resist layer forming step of forming a resist layer (34) along the groove, and a bottom portion (11) of the groove (11) on the surface of the base material (32).
a) and an electroless plating step of forming an electroless plating layer (15) on a portion other than the resist layer (34), and the electroless plating formed on the base material (32) after the electroless plating step An electroplating step of electrically conducting the layer (15) to form an electroplating layer (16) on a portion of the electroless plating layer (15) where plating is required. Partial plating method for products. 3. A groove (11) having a substantially V-shaped cross section is designed in a boundary part between a portion requiring plating and a portion not requiring plating on the surface of a resin base material (2). A groove forming step of forming with a mold so as to form an annular shape or a part of an annular shape only on the surface side; and a bottom portion (11) of the groove (11) on the surface of the base material (2).
An electroless plating step of forming an electroless plating layer (15) on a portion other than a), and plating on the electroless plating layer (15) formed on the non-design surface side of the base material (2) surface. A notch forming step of continuously forming a notch portion (42) so as to form an annular portion or a part of an annular portion so as to surround an unnecessary portion; By electrically conducting the electroless plating layer (15),
An electroplating step of forming an electroplating layer (16) on a portion of the electroless plating layer (15) that needs to be plated. 4. A groove (11) having a substantially V-shaped cross section is designed at a boundary line between a portion requiring plating and a portion not requiring plating on the surface of a resin base material (52). The mold is formed so as to form an annular shape or a part of an annular shape only on the surface side, and the ridge (53) is formed by a mold so as to form an annular shape or a part of the annular shape only on the non-designed surface side. And a bottom portion (11) of the groove (11) on the surface of the base material (52).
Of the electroless plating step of forming an electroless plating layer (15) on a portion other than a) and the electroless plating layer (15) formed on the base material (52) after the electroless plating step, The ridge (5
3) a cutting removal step of cutting or removing the electroless plating layer (15) formed thereon, and the electroless plating layer (15) formed on the base material (52) after the cutting removal step. An electroplating step of electrically conducting to form an electroplating layer (16) on a portion of the electroless plating layer (15) where plating is required, the method of partially plating a resin product. . 5. A simple groove (63) is formed on the surface of the resin base material (62) at the boundary between the part requiring plating and the part not requiring plating, only on the design surface side in an annular shape or A simple groove forming step of forming with a mold so as to form a part of an annular shape, and a resist layer (64, 65) along the simple groove (63)
Forming a resist layer, and forming a ring or a part of a ring on the whole non-designed surface of the base material (62) on the non-designed surface side or surrounding the non-plated portion. A resist coating layer forming step of forming a resist coating layer (13, 31), and an electroless plating layer (15) on a portion other than the resist layers (64, 65) and the resist coating layer (13, 31). And the electroless plating layer (15) formed on the base material (62) that has undergone the electroless plating step are electrically connected to each other to form the electroless plating layer (15). An electroplating step of forming an electroplating layer (16) on a portion where the above plating is required, a partial plating method for a resin product. 6. A simple groove (33, 63) is formed in an annular shape or an annular shape in a boundary line portion between a portion requiring plating and a portion not requiring plating on the surface of a resin base material (62). A simple groove forming step of forming a part so as to form a part, and a resist layer (34,
64, 65) to form a resist layer, an electroless plating step to form an electroless plating layer (15) on a portion other than the resist layer (34, 64, 65), and the electroless plating step. The electroless plating layer (15) formed on the base material (62) is electrically conducted to form an electroplating layer (16) on a portion of the electroless plating layer (15) where plating is required. And a method of partially plating a resin product. 7. A simple groove (63) is formed in an annular shape only on the design surface side at a boundary line between a portion requiring plating and a portion not requiring plating on the surface of a resin base material (62). A simple groove forming step of forming with a mold so as to form a part of an annular shape, and a resist layer (64, 65) along the simple groove (63)
A step of forming a resist layer, an electroless plating step of forming an electroless plating layer (15) on a portion other than the resist layers (64, 65), and a non-design surface side of the base material (62) surface. A notch forming step of continuously forming a notch (42) in the formed electroless plating layer (15) so as to surround a portion that does not require plating so as to form a ring or a part of the ring; The electroless plating layer (15) formed on the base material (62) that has undergone the forming step is electrically conducted, and an electroplating layer () is formed on a portion of the electroless plating layer (15) where plating is required. 16) The electroplating process of forming 16), The partial plating method of the resin product characterized by the above-mentioned. 8. A simple groove (63) is formed on the surface of the resin base material (62) at a boundary line between a portion requiring plating and a portion not requiring plating, which is annular or only on the design surface side. A groove groove ridge forming step of forming the ridge (53) so as to form a part of an annular shape and forming the ridge (53) so as to form an annular shape or a part of an annular shape only on the non-design surface side. And a resist layer (64, 65) along the simple groove (63)
A step of forming a resist layer, an electroless plating step of forming an electroless plating layer (15) on a portion other than the resist layers (64, 65), and a base material (62) that has undergone the electroless plating step Of the electroless plating layer (15) formed on the
3) a cutting removal step of cutting or removing the electroless plating layer (15) formed thereon, and the electroless plating layer (15) formed on the base material (62) after the cutting removal step. An electroplating step of electrically conducting to form an electroplating layer (16) on a portion of the electroless plating layer (15) where plating is required, the method of partially plating a resin product. . 9. A simple groove (63) is formed on the surface of the resin base material (62) at the boundary line between a part requiring plating and a part not requiring plating, only on the side of the design surface. The groove is formed so as to form a part of a ring, and the groove (11) having a substantially V-shaped cross section is formed so as to form a ring or a part of a ring only on the non-design surface side. A groove forming step, and a resist layer (64, 65) along the simple groove (63)
And a bottom portion (11) of the groove (11) on the surface of the base material (62).
a) and an electroless plating step of forming an electroless plating layer (15) on portions other than the resist layers (64, 65), and the non-electrolytic plating formed on the base material (62) after the electroless plating step. An electroplating step of electrically conducting the electroplated layer (15) to form an electroplated layer (16) on a portion of the electroless plated layer (15) where plating is required. Partial plating method for resin products.