JP2940349B2 - Manufacturing method of resin products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a coating material comprising a step or a groove formed on a surface of a resin base material only on a portion of the surface of the resin substrate which requires plating, and on other portions. The present invention relates to a method for manufacturing a resin product having a coating layer formed with a parting edge as a boundary.

[0002]

2. Description of the Related Art Conventionally, as this kind of technique, there has been proposed, for example, Japanese Patent Application No. 5-83603 filed by the present applicant. In this technique, as shown in FIG. 19, first, a grill main body 53 in which a groove 52 is formed in an annular shape in a step portion 51 is formed by die molding, and the grill main body 53 is subjected to electroless plating. At this time, the bottom 52a of the groove 52
In, because the gap is narrow, plating is not applied,
An electroless plating layer 54 is formed on all parts except these. Next, the grill main body 53 on which the electroless plating layer 54 is formed is subjected to electroplating. Then, the electroless plating layer 54 formed in the portion that does not require plating is dissolved by the electroplating solution, and in the required portion, the electroplating layer 55 is formed on the surface of the electroless plating layer 54 by energization. . The portion where the plating layer 56 including the electroless plating layer 54 and the electroplating layer 55 is formed
The coating is applied to the exposed portion by covering with an electroforming mask 57 to form a coating layer 58.

[0003] Therefore, when the coating layer 58 is formed, the grill main body 5 is directly interposed without using a primer layer.
The coating layer 58 is formed directly on the third. As a result, compared with the case where the coating layer is partially formed on the entire surface of the plating, the coating layer 58 can be firmly joined to the grill main body 53 to improve the durability. In addition, it is possible to improve the appearance quality and reduce the number of steps and cost in manufacturing.

[0004]

However, in the above prior art, the position of the groove 52 is not particularly specified. Therefore, as shown in FIG. 19, when the electroformed mask 57 is covered, the groove 52 may be exposed outside the electroformed mask 57 (upper side in the figure). In such a case, at the time of forming the coating layer 58, the plating layer 56 is also partially exposed, and the coating layer 58 may be formed on the exposed plating layer 56.

The above technique is excellent in that a general-purpose paint can be used since the coating layer 58 can be formed directly on the grill body 53 made of resin. But,
As described above, when the coating layer 58 is formed on some of the plating layers 56, if a general-purpose paint is used, a sufficient adhesive force between them is not ensured, and one of the coating layers 58 is not provided. There was a possibility that the part would be peeled off.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a method for forming a plating layer only on a portion of a surface of a resin substrate which requires plating. In the other part, in the resin product in which the coating layer is formed with the coating parting edge as a boundary, there is no fear of peeling due to the formation of the coating layer on the plating layer,
A method of manufacturing a resin product that can improve the durability performance by firmly joining a coating layer on a base material, and that can improve appearance quality and reduce man-hours and costs in manufacturing. To provide.

[0007]

In order to achieve the above object, the present invention provides an electroless electroforming method comprising the steps of forming a boundary between a coating part and a resin part having a coating part formed by steps or grooves. A plating layer comprising an electroplating layer formed on the plating layer and the electroless plating layer, and a coating layer formed by applying the coating parting portion as a boundary to a portion other than the plating layer on the base material surface. A method for producing a resin product, comprising: forming the coating part on the surface of the base material so as to form a ring or a part of a ring, and forming a strip having a substantially V-shaped cross section along the coating part. A groove forming step of forming a groove in an annular shape, an 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 base material having undergone the electroless plating step. Among the formed electroless plating layers, plating An electroplating step of electrically conducting a necessary portion to form an electroplating layer on a portion of the electroless plating layer which requires plating, and a step of covering the base with the electroplating layer covered with a coating. A coating layer forming step of forming a coating layer on a portion of the material surface that does not require plating, and in the groove forming step, the plating layer is not exposed when the coating is coated. The gist is to form the groove at an appropriate position.

[0008]

According to the above construction, in the groove forming step, the coating parting portion is formed on the surface of the resin base material so as to form a ring or a part of the ring. Also, the cross section is approximately V
A U-shaped groove is formed in an annular shape. In the electroless plating step, an electroless plating layer is formed on a portion other than the bottom of the groove on the surface of the base material. Subsequently, in the electroplating step, of the electroless plating layer formed on the base material that has undergone the electroless plating step, portions of the electroless plating layer that need to be plated are electrically conducted, and the necessary plating on the electroless plating layer is required. An electroplating layer is formed on the portion. At this time, portions of the electroless plating layer that do not require plating are dissolved and removed by the electroplating solution. Then, in the coating film layer forming step, the coating film layer is formed on a portion of the substrate surface that does not require plating, at least in a state where the electroplating layer is covered with the coating. Through the above steps, a plating layer is formed only on a portion that requires plating, with a coating parting edge as a boundary, and a coating layer is formed on other portions on the resin base material. The obtained resin product is obtained.

In the above electroless plating step, no electroless plating layer is formed at the bottom of the groove. For this reason, in the electroplating step, a portion requiring plating is electrically conducted, and an electroplating layer is formed on the portion requiring plating on the electroless plating layer. In addition, the electroless plating layer in a portion that does not require plating is removed. Therefore, at this stage, a base material having an electroless plating layer and an electroplating layer formed only on necessary portions is obtained. Therefore, in the coating film layer forming step, the coating film layer can be directly formed on the substrate without the intervention of the primer layer.

In the step of forming grooves, the grooves are formed by:
When the coating is coated, the coating is formed at a position where the plating layer is not exposed. Therefore, in the coating layer forming step,
In the state where the coating is covered, the coating layer is not formed while the plating layer is exposed. for that reason,
No coating layer is formed on the plating layer.

[0011]

【Example】

(First Embodiment) FIGS. 1 to 1 show a first embodiment in which the present invention is embodied in a vehicle front grill 1 as a resin product.
1 will be described.

A front grill 1 as shown in FIG. 2 is mounted on the front of the vehicle. Figures 2, 3,
As shown in FIG. 6, the front grill 1 has a front grill main body (hereinafter, referred to as a grill main body) 2 as a base made of ABS resin, and has a part of its design surface, that is, a part of the front surface. The formed plating layer 3 (FIG. 3)
In this case, the coating layer 4 is formed in a portion other than the plating layer 3 (excluding a part of the back side). More specifically, the front grill 1
A frame 5 having a substantially rectangular front surface, a plurality of sub-partitioning plates 6 extending in the horizontal direction in the frame 5, a plurality of connecting plates 7 extending in the vertical direction in the frame 5, and a mark plate (not shown) in the center portion Mounting plate 8 and frame 5 for mounting
And a main partition plate 9 extending toward the mounting plate 8. The plating layer 3 is formed mainly on the front side of the frame 5 and on the front side of the main partition plate 9. The coating layer 4 is formed mainly on the front side of the sub-partition plate 6, the mounting plate 8, and the connecting plate 7.

FIG. 4 is an enlarged front view showing a part (part α in FIG. 3) of the main partition plate 9, and FIG.
It is a line sectional view. As shown in these figures and FIG. 6, in the front side portion of the grill main body 2, the boundary between the plating layer 3 and the coating layer 4 has a coating projecting vertically from the frame 5 and the main partition plate 9. Front side step part 10 as parting part
Are formed in an annular shape. And this front side step part 1
At 0, a groove 11 having a substantially V-shaped cross section is formed in an annular shape (closed curve shape) (see FIG. 3). FIG. 7 is an enlarged rear view showing a part of the rear side of the frame 5 (part β in FIG. 3). As shown in the figure, a groove 13 having a substantially V-shaped cross section is formed annularly at a boundary portion between the plating layer 3 and a portion where the plating layer 3 is not formed on the back surface side portion of the grill main body 2. (See FIG. 3). Furthermore, the grill body 2
An electrode projection 14 protruding in the rear direction (rearward direction of the vehicle) is formed on the rear side (see FIG. 3).

As shown in FIG. 6, the plating layer 3 includes an electroless plating layer 15 and an electroplating layer 16. In this embodiment, the electroless plating layer 15 is formed of nickel to a thickness of about “0.3 to 0.4 μm”. Further, the electroplating layer 16 is formed of three kinds of metals of copper, nickel and chromium and has a thickness of about 20 to 50 μm, and has a multilayer structure.

The grooves 11 and 13 have a width W of 0.5 mm and a depth D of 0.5 mm. However, the width W is not particularly limited, but is preferably "0.2 mm" or more from the viewpoint of processing, and is preferably "1.0 mm" or less from the viewpoint of improving design. Also, the depth D is not particularly limited, but is preferably equal to or more than “0.2 mm” in view of the processing limitation, and “0.
6 mm "or less is preferable. Further, the ratio (D / W) of the depth D to the width W is preferably "1.0" or more.

Further, as shown in FIG.
When the electroforming mask 27 described later is covered, the plating layer 3 is sufficiently covered so that at least all the plating layers 3 on the front side are covered, that is, so as not to go outside the electroforming mask 27.
(Lower side in the figure).

Next, a mold 21 for molding the grill main body 2 will be described. As shown in FIG. 8, the mold 21 includes a fixed mold 22 and a movable mold 23. A cavity 24 for forming the grill main body 2 is formed by the two dies 22 and 23. However, the movable groove 23 (or the fixed die 22) has the grooves 11, 13
Are formed integrally with each other.

Next, an operation and an effect in manufacturing the above-described front grill 1 will be described. First,
The ABS resin melted into the cavity 24 is injected and filled by a known mold molding method (see FIG. 8). When the resin is cooled and solidified, the molds 22 and 23 are opened, and the grill body 2 is taken out. At this time, both types 22, 2
3 is opened in parallel with the mold opening direction, that is, in a direction in which the protrusions 26 and the like come off. Therefore, the opening of the mold is not hindered by the projections 26 and the like, and the grill main body 2 can be easily taken out. In this way, the grill main body 2 in which the grooves 11 and 13 are respectively formed at predetermined positions in a ring shape is obtained.

Subsequently, the grill main body 2 is immersed in an electroless plating solution to perform electroless plating. At this time, as shown in FIG. 9, the plating solution does not reach the bottoms 11a and 13a of the grooves 11 and 13 because the gap between the gaps is small (however, in FIG. 1 and FIGS. For convenience, only the front groove 11 will be described, but the same can be said for the rear groove 13). Therefore, these bottoms 11a and 13a are not plated. In other words, the electroless plating layer 15 is formed on all portions of the surface of the grill main body 2 except for the bottom portions 11a and 13a.

Next, as shown in FIG. 10, the grill main body 2 on which the electroless plating layer 15 is formed is subjected to electroplating. That is, the main body 2 is immersed in a predetermined electroplating solution a plurality of times, and a portion requiring plating (frame 5) is used.
Of the front side and the front side of the main partition plate 9)
Are electrically conducted. At this time, the electrode projections 14 protruding from the back side of the grill main body 2 constitute one electrode. Then, the electroless plating layer 15 formed in a portion that does not require plating is dissolved by the electroplating solution. In a portion requiring plating, the electroplating layer 16 having the above-mentioned multilayer structure is formed on the surface of the electroless plating layer 15 (lower side in the figure). In this way, the grill main body 2 on which the electroless plating layer 15 and the electroplating layer 16 (plating layer 3) are formed only in the portions requiring plating is formed.

Thereafter, as shown in FIG.
Is covered with an electroformed mask 27 as a covering body. That is, the electroformed mask 27 is a metal plate having a thickness of “several mm” and has a shape conforming to the shape of the front grill 1. Also, the electroformed mask 27
An opening 28 is formed as needed in an opening only for a portion necessary for forming the coating layer 4. Due to the coating of the electroformed mask 27, a portion necessary for forming the coating layer 4 is exposed from the opening 28.

At this time, the grooves 11 correspond to all the plating layers 3.
Is formed on the plating layer 3 side (the lower side in FIG. 11) so that the electroforming mask 27 is covered.
The plating layer 3 is not exposed. Then, as shown in FIG. 11, spray coating is applied to the exposed portion outside the exposed portion. By this coating, the coating layer 4
Is formed. On the other hand, the coating layer 4 is not formed on the portion covered by the electroformed mask 27.

After the coating layer 4 is formed, the front grille 1 is obtained by releasing the coating of the electroformed mask 27 as shown in FIG. That is, the plating layer 3 is mainly provided on the front side portion of the frame 5 and the front side portion of the main partition plate 9, and the sub partition plate 6 and the mounting plate 8 are provided.
In addition, the front grill 1 having the coating layer 4 mainly on the front side portion of the connecting plate 7 is obtained.

According to the present embodiment, when forming the electroless plating layer 15, the bottoms 11a, 11b of the grooves 11, 13 are formed.
The electroless plating layer 15 is not formed on 13a. For this reason, when forming the electroplating layer 16, only portions that require plating are electrically conducted. That is, the electroless plating layer 15 formed in a portion that does not require plating is dissolved by the electroplating solution. In a portion requiring plating, the electroplating layer 16 having the above-described multilayer structure is formed on the surface of the electroless plating layer 15. Therefore, at this stage, the grill main body 2 in which the plating layer 3 is reliably formed only in the necessary portions is obtained. Therefore, when the coating layer 4 is formed, the coating layer 4 is directly formed on the grill body 2 without the intervention of the primer layer.
Can be formed.

As a result, the step of forming the primer layer is not required, so that the number of working steps and the cost can be reduced. In addition, since it is not necessary to form the electroplating layer 16 on the entire surface of the grill main body 2, the cost can be reduced accordingly.

In the front grill 1, the coating layer 4 is formed directly on the grill main 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 layer 4 can be reduced, and the appearance quality can be improved. Further, since both the coating layer 4 and the grill main body 2 are made of a resin material,
The coating layer 4 can be firmly joined to the grill main 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 11 on the front side serves as a boundary between the coating layer 4 and the plating layer 3. For this reason, the parting part of the boundary part is formed not in a zigzag shape but sharply. As a result, the parting line can be made clear and clear, and the appearance quality can be further improved.

In addition, in the present embodiment, the groove 11 is sufficiently formed on the plating layer 3 side (FIG. 11) so that all the plating layers 3 are covered.
In this case, the plating layer 3 is not exposed when the electroformed mask 27 is covered. Therefore, when the coating is performed, the coating layer 4 is not formed on the portion covered by the electroformed mask 27, that is, on the plating layer 3. Therefore, the coating layer 4 is formed using a general-purpose paint.
Is formed, there is no danger of peeling of the coating film layer 4 due to being formed on the plating layer 3, and the coating film layer 4 can be firmly joined to the grill main body 2 to improve durability performance. . In addition, it is possible to prevent the appearance quality from deteriorating due to peeling. (Second Embodiment) Next, a second embodiment in which the present invention is embodied in a vehicle front grille 31 also as a resin product will be described with reference to FIGS. However, in this embodiment, the main parts of the invention are almost the same as those of the first embodiment, and therefore, the description will be made focusing on the differences.

As shown in FIGS. 12 and 13, similarly to the first embodiment, the front grill 31 includes a grill body 32 as a base material, and includes a plating layer 33 and a plating layer 3.
It has a coating layer 34 applied and formed at a position other than 3 (excluding a part of the back side). In the present embodiment, the shape of the front grill 31 is significantly different from that of the first embodiment. That is, the front grille 31 has a substantially rectangular frame 35 on the front and a grid-shaped partition plate 36 in the frame 35. The frame 35 has a substantially U-shaped cross section.
A groove 37 as a letter-shaped paint parting part is formed in an annular shape. The plating layer 33 is formed on the outer peripheral side of the groove 37 of the frame 35, and the coating layer 34 is formed on the inner peripheral side (the partition plate 36 and the like) of the groove 37.

The groove 37 has a groove 3 having a substantially V-shaped cross section.
8 (see FIG. 13) is formed in an annular shape (closed curve shape). A groove (not shown) having a substantially V-shaped cross section is also formed in a boundary portion between the plating layer 33 and a portion where the plating layer 33 is not formed on the rear surface side portion of the grill main body 32. ing. Further, a projection (not shown) for an electrode is formed on a rear surface side portion of the grill main body 32 so as to protrude.

As shown in FIG. 13, also in this embodiment, the plating layer 33 includes an electroless plating layer 39 and an electroplating layer 40. Further, the groove 38 is sufficiently plated so that at least the plating layer 33 on the front side is completely covered when the electroforming mask 41 described later is covered, that is, the plating layer 33 is not exposed outside the electroforming mask 41. 33
Side (the upper side in the figure, that is, the outer peripheral side).

Next, the operation and the effect of manufacturing the front grill 31 will be described. First, the groove 38 is formed at a predetermined position by a known molding method.
The grill main body 32 (including the back side) is formed in an annular shape. Subsequently, the grill main body 32 is immersed in an electroless plating solution to perform electroless plating. At this time, FIG.
As shown in FIG. 4, the bottom 38a is not plated because the space between the gaps is small, and the electroless plating layer 39 is formed on all portions of the grill main body 32 except for the bottom 32a.

Next, as shown in FIG. 15, the grill main body 32 on which the electroless plating layer 39 is formed is subjected to electroplating. Then, the electroless plating layer 39 formed in the portion not requiring plating is dissolved by the electroplating solution, and in the portion requiring plating, the surface of the electroless plating layer 39 is subjected to electroplating forming a multilayer structure. The layer 40 is formed, and as a result, the plating layer 33 is formed (upper side of the figure).

Thereafter, as shown in FIG.
3 is formed on an electroformed mask 41 as a coating.
To cover. By this coating, a portion necessary for forming the coating layer 34 is exposed from the inside (the lower side in the figure) of the opening 42 of the electroformed mask 41.

At this time, the groove 38 is sufficiently formed so that at least all the plating layers 33 on the front side are covered.
Since it is formed on the side (the upper side in FIG. 16), the plating layer 33 is not exposed when the electroformed mask 41 is covered. Then, as shown in FIG. 17, spray coating is applied to the exposed portions outside the exposed portions. By this coating, a coating film layer 34 is formed at a necessary portion of the coating film. On the other hand, the coating layer 34 is not formed on the portion covered by the electroformed mask 41.

After the coating layer 34 has been formed, FIG.
As shown in FIG. 3, by releasing the coating of the electroformed mask 41, the front grille 31 is obtained. That is, the plating layer 33 is provided mainly on the outer peripheral portion of the groove portion 37 of the frame 35, and the partition plate 3 is provided mainly on the inner peripheral side thereof.
Thus, the front grill 31 having the coating layer 34 in the portion 6 is obtained.

In this embodiment, the same effects as in the first embodiment can be obtained. Note that the present invention is not limited to the above embodiments, and may be implemented as follows by appropriately changing a part of the configuration without departing from the spirit of the invention.

(1) In the first embodiment, the present invention is embodied in the front grille 1 having the stepped portion 10, and in the second embodiment, it is embodied in the front grille 31 having the groove 37 having a substantially U-shaped cross section. In addition to this, as shown in FIG. 18, for example, the present invention may be embodied in a case where a groove 43 is provided as a paint parting part having a substantially V-shaped cross section.

(2) In the above embodiments, the present invention is embodied in the front grills 1 and 31 for the vehicle.
It may be embodied as an outer cover for a vehicle door mirror bracket, a back panel, a louver, a pillar garnish, a quarter vent, a mark plate, or 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.

(3) In each of the above embodiments, the resin material constituting the base material is made of ABS resin. However, other than that, for example, polypropylene, polyphenylene oxide, polyamide, polysulfone, polyester, etc. Various resin materials may be used.

(4) In each of the above embodiments, the electroless plating layers 15 and 39 are formed of nickel, but may be formed of copper or the like. Further, in the above-described embodiment, the electroplating layers 16 and 40 are formed to have a multilayer structure by using three kinds of metals of copper, nickel and chromium, but other metals may be used. The present invention may be embodied when not having a multilayer structure.

(5) In the above embodiments, the grooves 11, 13, and 38 are formed by the mold 21, but each groove is formed by post-processing using an NC cutter, an ultrasonic cutter, or the like. May be.

[0043]

As described in detail above, according to the method for manufacturing a resin product of the present invention, a plating layer is formed only on a portion of the surface of a resin substrate that requires plating,
In other areas, in the resin product where the coating layer is formed with the coating parting edge as the boundary, there is no risk of peeling due to the formation of the coating layer on the plating layer, and the coating layer on the substrate Are firmly joined to improve durability performance, and furthermore, there is an excellent effect that the external appearance quality can be improved and the number of steps and cost for manufacturing can be reduced.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a state in which a coating layer is formed on a grill main body in a state where a predetermined location is covered with an electroformed mask in a first embodiment of 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 a front grill in the first embodiment, and is a schematic diagram in which the front grill is developed on the front and the back.

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

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

FIG. 6 is an enlarged cross-sectional view showing a main part of FIG. 5 in the first embodiment.

FIG. 7 is a rear view showing a part of a frame of a front grill in an enlarged manner in the first embodiment.

FIG. 8 is an enlarged sectional view showing a part of a mold for molding a grill main body in the first embodiment.

FIG. 9 is a partial cross-sectional view showing a state where electroless plating is applied to a grill main body in the first embodiment.

FIG. 10 is a partial cross-sectional view showing a state where an electroplating is applied to a grill main body on which an electroless plating layer is formed in the first embodiment.

FIG. 11 is a partial cross-sectional view showing a state where an electroformed mask is coated on a portion of the grill main body where a plating layer is formed in the first embodiment.

FIG. 12 is a front view showing a front grill in a second embodiment embodying the present invention.

FIG. 13 is a sectional view taken along the line BB of FIG. 12, showing the vicinity of a groove of a front grill in the second embodiment.

FIG. 14 is a partial cross-sectional view showing a state where an electroless plating is applied to a grill main body in the second embodiment.

FIG. 15 is a partial cross-sectional view showing a state where an electroplating is applied to a grill main body on which an electroless plating layer is formed in a second embodiment.

FIG. 16 is a partial cross-sectional view showing a state where an electroformed mask is applied to a portion of the grill main body where a plating layer is formed in the second embodiment.

FIG. 17 is a partial cross-sectional view showing a state in which a coating layer is formed on a grill main body in a state where a predetermined location is covered with an electroformed mask in the second embodiment.

FIG. 18 is a sectional view of a main part showing another embodiment of the present invention.

FIG. 19 is a cross-sectional view of a main part showing the vicinity of a groove of a front grill in the related art.

[Explanation of symbols]

1,31: Front grill as a resin product, 2,32
... Grill body as base material, 3, 33 ... plating layer, 4,
34: Coating layer, 10: Step part as coating parting part, 1
1, 13, 38: groove, 11a, 13a, 38a: bottom, 15, 39: electroless plating layer, 16, 40: electroplating layer, 27, 41: electroformed mask as coating, 3
7, 43: grooves as paint parting parts.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) C23C 28/00 C23C 18/16 C25D 5/02 C25D 5/56

Claims (1)

(57) [Claims] A parting-off part (10, 10) comprising a step or a groove.
37, 43) on a resin base material (2, 32).
The electroless plating layer (15, 39) formed with the paint parting portion (10, 37, 43) as a boundary and the electroplating layer (1) formed on the electroless plating layer (15, 39).
6, 40), and the coating parting-off parts (10, 37, 43) on portions of the surface of the base material (2, 32) other than the plating layer (3, 33). A method of manufacturing a resin product comprising a coating layer (4, 34) formed by application as a boundary, wherein the coating parting part (10, 3) is provided on the surface of the base material (2, 32).
7, 43) are formed so as to form an annular shape or a part of an annular shape. Forming a groove on the surface of the base material (2, 32);
8) An electroless plating step of forming an electroless plating layer (15, 39) other than at the bottom (11a, 13a, 38a) of the base (2, 32). Of the electroless plating layers (15, 39) thus formed, the portions requiring plating are electrically conducted, and the portions requiring plating on the electroless plating layers (15, 39) are electrically connected to the electroplating layers (15, 39). An electroplating step of forming the electroplating layer (16, 40);
A coating layer forming step of forming a coating layer (4, 34) on a portion of the substrate (2, 32) that does not require plating in the state covered by 1), and forming the groove. In the step, at a position where the plating layer (3, 33) is not exposed when the coating body (27, 41) is coated,
A method of manufacturing a resin product, wherein the grooves (11, 13, 38) are formed.