Plating burn prevention jig and plating method using the same

Abstract

To prevent the occurrence of plating burn on resin molded parts by placing an anti-burn jig within a plating tank and mitigating excessive current density generated in the tank using the jig.SOLUTION: A plating burn prevention jig arranged in a plating tank 72 adjacent to a hanger 71 to which a resin molded product W is attached includes: a rectangular plate-like auxiliary member 2 for actively depositing plating; and a plurality of mounting holes 3 formed at a plurality of locations in the plate-like auxiliary member 2, into which tips of clamping portions 71b, which are attached to support portions 71a of the hanger 71, are detachably insertable. During plating, the plating burn prevention jig 1 is placed in a position adjacent to the resin molded product W, and plating is actively deposited on the plating burn prevention jig 1, thereby preventing plating from being deposited on the resin molded product W in a state of excessive current density.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an auxiliary tool used when plating a resin molded product, and more particularly to a plating scorch prevention jig that eliminates defects in the plating film, such as scorch, that occur when plating a resin molded product, and a plating method using the same. [Background technology]

[0002] In a conventional resin plating method, a resin molded product to be plated is subjected to an etching process to roughen the surface of the resin molded product, an etching neutralization process, a catalyst application process, and a conductive process (or electroless plating).The resin molded product thus pretreated is then subjected to each plating process in the order of copper plating and nickel plating, and finally to a chrome plating process.

[0003] In the resin plating method involving these steps, a resin molded product is attached to a hanger and plated. This hanger comprises a support pole with a hook at its upper end and multiple clamping parts attached to it. For example, the clamping parts are spring-loaded so that their tips open and close to clamp. The tip of each clamping part is formed with a hook so that the resin molded product can be hung on it. This hanger is suitable for mass production of identically shaped products, such as automotive resin-plated parts such as interior door handles, exterior door handles, and exterior handle cover parts for automobiles, housing-related resin-plated parts such as shower heads and faucet parts, and even mobile phone parts.

[0004] Also, a hanging tool is used that has four clamping parts, two on the top and two on the bottom, to hang one resin molded product with four hooks. This is suitable for attaching large resin molded products.

[0005] On the surface of a resin molded product W (workpiece) plated using such a hanging tool 71, a current distribution like that shown in the explanatory diagram of current distribution in electroplating in Figure 89 occurs. In the plating tank, current flows only on the electrode plate 73 side of the resin molded product W, and current does not flow easily on the surface opposite the electrode plate 73 or on the inner surface of the resin molded product W (the left side in Figure 10). Since plating is formed only where current flows, thin plating is formed on the surface opposite the electrode plate 73 and on the inner surface of the resin molded product W, where little current flows.

[0006] Generally, the current density is higher in parts of a resin molded product W that protrude outward. The plating metal is more likely to deposit on the convex parts and protruding corners of the resin molded product W. As shown in the cross-sectional view of a plated product with a thick film thickness at the burrs in Figure 10, when plating is performed on a plate-shaped resin molded product W, the current density is higher at the burrs at the corners of the resin molded product W, so the film thickness t1 at the burrs tends to be thicker than the film thickness t2 at the center of the resin molded product W, where the current density is lower. In the case of plating with low throwing power like this, roughness occurs at the corners of the burrs, losing their luster and damaging the appearance. In particular, excessive current density can cause a problem known as "plating burn." This refers to a rough, brittle, burnt-like plating film that deposits on the surface of the resin molded product W, and is also called plating burn.

[0007] As a countermeasure, conventionally, excessive plating is prevented by forming a rounded surface (R surface) 76 in advance on the corners and protruding portions of a resin molded product W, as shown in the explanatory cross-sectional views of Figures 12(a) and 12(b) which show different plating film thicknesses. For example, the resin molded product W on the left side of the figure has sharp corners and protruding portions. Therefore, by forming a rounded surface (R surface) 76 on each of these portions, as in the resin molded product W on the right side, the formation of uneven film thickness is prevented.

[0008] However, forming a rounded surface 76 on the corners or protruding portions of such a resin molded product W limits the degree of freedom in designing the product, making it a countermeasure that cannot be adopted for precision products. Therefore, as shown in the cross-sectional view of Figure 13, which shows plating using a shielding plate in a plating tank, a plating technology has been proposed in which a shielding plate 74 is placed between an electrode plate 73 and the resin molded product W in a plating tank 72, particularly at the corners or protruding portions of the resin molded product W. This shielding plate 74 is a plate that casts a shadow on the corners of the resin molded product W or their surroundings. This prevents excessive current density from occurring at the ends of the resin molded product W.

[0009] 14, electrolysis concentration prevention devices (plating burn prevention devices) 77 are attached to the top and bottom of the hanging tool 71. These electrolysis concentration prevention devices 77 are intended to prevent excessive current density from occurring at or around the corners of the resin molded product W hung on the hanging tool 71.

[0010] Furthermore, with regard to a technology relating to plating processing in which the shape of the lower end of a current shielding plate is improved to enable uniform plating, for example, Patent Document 1, Japanese Patent Laid-Open No. 8-296086, entitled "Electroplating Apparatus," proposes an electroplating apparatus in which current shielding plates for adjusting the plating current are provided on both the upper and lower sides of a metal strip whose cross section is vertical and which travels within a plating tank, and further in which fluid nozzles are provided to spray fluid from between the current shielding plates on both lower sides to cause the plating liquid to flow, and in which the current shielding plates on both upper sides are provided with a predetermined inclination and their lower ends are wedge-shaped. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] Japanese Patent Application Publication No. 8-296086 Summary of the Invention [Problem to be solved by the invention]

[0012] The resin molded parts of the suspending fixtures that were arranged in rows did not suffer from problems even when excessive current densities were generated due to the presence of adjacent resin molded parts. However, the resin molded parts of the suspending fixtures that were attached to both ends in the plating tank had the problem of being unable to eliminate plating scorch.

[0013] Furthermore, there was a problem that defects caused by excessive current density could not be eliminated even for resin molded products larger than automotive resin-plated parts, such as interior door handles and exterior door handle parts for automobiles, which are approximately 10 cm to 20 cm in size.

[0014] The present invention has been devised to solve these problems. That is, the object of the present invention is to provide a plating scorch prevention jig (1) that is placed in a plating tank and that can prevent plating scorch on a resin molded product by allowing the plating scorch prevention jig (1) to mitigate the excessive current density generated in the plating tank, and a plating method using the same. [Means for solving the problem]

[0015] The plating scorch prevention jig of the present invention is a plating scorch prevention jig (1) that prevents scorching of a resin molded article (W) hung on a hanger (71) when the resin molded article (W) is wet-plated in a plating tank (72), and includes: a rectangular plate-like auxiliary member (2) that is disposed adjacent to the hanger (71) to which the resin molded product (W) is attached in the plating tank (72) and that actively deposits plating; and mounting holes (3) formed in a plurality of locations on the plate-shaped auxiliary member (2) into which the tips of the clamping portions (71b) attached to the supports of the hanging tool (71) are detachably inserted, During plating treatment, the plating scorch prevention jig (1) is placed in a position adjacent to the resin molded product (W), and plating is actively deposited on the plating scorch prevention jig (1), thereby preventing plating from being deposited on the resin molded product (W) in a state where an excessive current density is generated.

[0016] It is preferable that a rounded portion (6) is formed at the longitudinal end of the plate-shaped auxiliary member (2) so that plating does not deposit locally. The plate-like auxiliary member (2) has a folding line (5) formed thereon so that it can be easily broken and separated into a plurality of pieces. The plate-shaped auxiliary member (2) is a plate-shaped member made of synthetic resin that is flexible enough to be bent to fit the outer shape of the resin molded product (W). A cylindrical boss (4) was formed in the mounting hole (3) of the plating burn prevention jig (1) at the tip of the clamping part (71b) of the hanging tool (71) inserted into the mounting hole (3) to prevent plating from being deposited locally.

[0017] The plating method of the present invention is a method for wet-plating a resin molded article (W) in a plating tank (72) while preventing scorching of the resin molded article (W) by using a plating scorch prevention jig (1), comprising: First, the resin molded product (W) to be plated is attached to the clamping portion (71b) of the hanger (71), and the hanger (71) is hung in the plating tank (72). The plate-shaped auxiliary member (2) of the plating scorch prevention jig (1) is placed in the plating tank (72) around the resin molded product (W) hung on the hanging tool (71), With the plating scorch prevention jig (1) in place, wet plating is performed, The plating is actively deposited on the plate-shaped auxiliary member (2) of the plating scorch prevention jig (1), and plating is performed while preventing the plating from being deposited in a state where an excessive current density is generated in the resin molded product (W).

[0018] The plating scorch prevention jig (1) is placed adjacent to the electrode plate (73) placed in the plating tank (72) during plating. The plating scorching prevention jigs (1) are disposed above and below the hanging tool (71) during plating.

[0019] The plating scorch prevention jig (1) can be curved along the outline of the resin molded product (W) to be plated and placed in the plating tank (72). [Effects of the Invention]

[0020] The plating scorch prevention jig (1) configured as described above is placed between the resin molded product (W) and the electrode plate (73) in the plating tank (72), and plating is actively deposited on the plate-shaped auxiliary member (2) of this plating scorch prevention jig (1), thereby preventing plating scorch on the resin molded product (W) and making the plating film thickness uniform.

[0021] In the plating scorch prevention jig (1) in which the rounded portions (6) are formed at the longitudinal ends of the plate-shaped auxiliary member (2), plating scorch does not occur on the plate-shaped auxiliary member (2) itself. Therefore, plating scorch can be efficiently prevented by depositing plating uniformly on the plate-shaped auxiliary member (2). The plate-shaped auxiliary member (2) can be easily broken into multiple pieces by forming a folding line (5) for breaking. The length can be adjusted according to the length of the support part (71a) of the hanging device (71). If the plate-shaped auxiliary member (2) is made of a flexible synthetic resin plate, it can be curved to fit the outer shape of the resin molded product (W). This plating scorch prevention jig (1) can be used to prevent plating scorch even for large resin molded products (W). In the plating scorch prevention jig (1) in which a cylindrical boss (4) is formed in the mounting hole (3) of the plate-shaped auxiliary member (2), plating is not locally deposited on the tip of the clamping portion (71b) of the hanging tool (71) that is inserted into the plating scorch prevention jig (1), so that the plating scorch prevention jig (1) can be easily attached and detached from the clamping portion (71b) of the hanging tool (71).

[0022] In the method configured as described above, the plate-shaped auxiliary member (2) is placed between the electrode plate (73) at the corner or protruding portion of the resin molded product (W) to actively deposit the plating, which prevents the occurrence of plating scorch caused by excessive current density and makes the plating film thickness uniform. Furthermore, the plate-shaped auxiliary member (2) can be placed above or below the plating tank (72) to actively deposit the plating. [Brief explanation of the drawings]

[0023] [Figure 1] 1A and 1B show a jig for preventing plating scorching according to Example 1, in which FIG. 1A is a front view and FIG. 1B is a side view. [Figure 2] 1A and 1B show a state in which the plating scorch prevention jig is attached to a hanging tool, where FIG. 1A is a front view and FIG. 1B is a plan view. [Figure 3] 1 is a cross-sectional view showing a state in which a resin molded product and a plating scorch prevention jig are attached to a plating hanger in a plating tank. FIG. [Figure 4] 1A shows the state in which the plating scorch prevention jig has been broken, where (a) is a front view, (b) is a side view, and (c) is an enlarged side view of the break line portion. [Figure 5] 1A and 1B show a modified example of the plating scorch prevention jig of Example 1, in which (a) is a front view, (b) is a side view, and (c) and (d) are enlarged perspective views of the rounded portion. [Figure 6] FIG. 1 is a flow diagram of a plating method using a prevention jig to prevent plating scorching. [Figure 7] FIG. 10 is a flow chart of another method for plating while preventing plating scorch using a prevention jig. [Figure 8] 10 is a cross-sectional view showing another example of the arrangement of a resin molded product and a plating scorch prevention jig attached to a plating hanger in a plating tank. FIG. [Figure 9] 1 is an explanatory plan view showing a state in which the plating scorch prevention jig is used by bending it along the outline of the resin molded product to be plated. FIG. [Figure 10] FIG. 2 is an explanatory diagram of current distribution in electroplating. [Figure 11] This is a cross-sectional view of a plated product in which the film thickness of the burrs at the corners is thicker than that of the center of the resin molded product. [Figure 12] 1A and 1B are explanatory cross-sectional views showing the state in which the plating film thickness differs by forming a rounded surface on the corner or protrusion of a resin molded product, where (a) shows the state before the rounded surface is formed, and (b) shows the state after the rounded surface is formed. [Figure 13]FIG. 10 is a cross-sectional view showing a state in which plating is performed using a shielding plate in a plating tank. [Figure 14] 1 is a cross-sectional view showing a state in which a resin molded product and a plating scorch prevention jig are attached to a plating hanger in a plating tank. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0024] The present invention provides a plating scorch prevention jig that prevents plating from being deposited on a resin molded product hung on a hanging device when the resin molded product is wet-plated in a plating tank under conditions where an excessive current density is generated, and a plating method using the same. [Example]

[0025] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 shows the jig for preventing plating scorching of Example 1, where (a) is a front view and (b) is a side view. Fig. 2 shows the state in which the jig for preventing plating scorching is attached to a hanging tool, where (a) is a front view and (b) is a plan view. Fig. 3 is a cross-sectional view showing the state in which a resin molded product and the jig for preventing plating scorching are attached to the hanging tool in a plating tank. <Configuration of plating burn prevention jig> The plating scorch prevention jig 1 of Example 1 is a member in which mounting holes 3 are drilled in multiple locations on a rectangular plate-shaped auxiliary member 2. The plating scorch prevention jig 1 is a member made of a synthetic resin material on which plating is actively deposited. The plating scorch prevention jig 1 in the illustrated example has dimensions of approximately 350 mm in length, 14 mm in width, and 2 mm in thickness. Note that these numerical values ​​are merely examples and are not limited to these values. The overall length can be increased or decreased depending on the length of the support portion 71a of the hanger 71. The width of the plate-shaped auxiliary member 2 can also be increased or decreased.

[0026] The plating scorch prevention jig 1 is made of, for example, the following synthetic resin material. ABS (Acrylonitrile Butadiene Styrene) AES (Acrylonitrile-Ethylene-Styrene) ASA (Acrylonitrile-Styrene-Ethylene Acrylate) PC / ABC (Polycarbonate / Acrylonitrile Butadiene Styrene) PC (Polycarbonate) PP (polypropylene) PA (Polyamide) PPS (Polyphenylene sulfide) PS (polystyrene) SPS (syndiotactic polystyrene) POM (Polyoxymethylene) PEI (Polyetherimide)

[0027] By using the same material as the resin molded product W, i.e., the plating material, it can be used in the same plating process. Also, as long as the material and the plating scorch prevention jig 1 can be plated in the same plating process, it does not matter if the materials for the plating material and the scorch prevention material are different. For example, when the material of the resin molded product W is (PC / ABS), the plating scorch prevention jig 1 is made of ABS. Taking into account bending and curving, ABS is preferable in terms of bending elasticity and cuttability, and also improves formability. For example, ABS is a preferable material for the plating scorch prevention jig 1 because it is inexpensive.

[0028] If the width of the plating scorch prevention jig 1 is too wide, it may interfere with the resin molded product W when used adjacent to the resin molded product W. Conversely, if the width of the plating scorch prevention jig 1 is too narrow, it may not be possible to open the mounting hole 3 for latching the tip of the clamping portion 71b of the hanging tool 71.

[0029] The length of the plating scorch prevention jig 1 of the present invention is approximately 35 cm. This is shorter than the length of the support posts 71a of the hanger 71 to which the resin molded product W is attached, which is, for example, approximately 100 cm. If the length were the same as the entire length of the support posts 71a, the storage and handling of the plating scorch prevention jig 1 might become cumbersome. Conversely, if the plating scorch prevention jig 1 were shorter than approximately 35 cm, the number of jig pieces to be attached to the clamping portion 71b of the hanger 71 would increase, and the number of times they would be attached and detached would increase, making the work even more cumbersome.

[0030] In the illustrated example, seven mounting holes 3 are drilled in one plating scorch prevention jig 1. This is to allow the insertion of the tips of clamping parts 71b, which are provided at predetermined intervals on support posts 71a of a hanging tool 71. The upper end of this hanging tool 71 has hooks 71c for hanging it over a plating tank 72.

[0031] The distance (D1) between the first and second mounting holes 3 from the top of the page in FIG. 1 , the distance (D2) between the third and fifth mounting holes 3, and the distance (D3) between the sixth and seventh mounting holes 3 are all the same. The fourth mounting hole 3 is located in the middle of the jig 1 in the longitudinal direction and is used when the jig 1 is attached to something other than the suspender 71 or when the jig 1 is curved and fixed. The number of mounting holes 3 per jig 1 is not limited to seven. A longer plate-shaped auxiliary member 2 will have more mounting holes 3. A hanging tool 71 with a narrower spacing between the clamping portions 71b will also have more mounting holes 3. Conversely, a shorter plate-shaped auxiliary member 2 will have fewer mounting holes 3. A hanging tool 71 with a wider spacing between the clamping portions 71b will also have fewer mounting holes 3.

[0032] As shown in FIGS. 1(a) and 1(b), a cylindrical boss 4 is formed in the mounting hole 3 of the plating scorch prevention jig 1 in the direction of penetration of the mounting hole 3. When plating is deposited with the tip of the clamping portion 71b inserted into the mounting hole 3 drilled in a thin plate, a large amount of plating is deposited on the tip of the clamping portion 71b protruding from the mounting hole 3, making it difficult to remove the plating scorch prevention jig 1 from the hanger 71. When the cylindrical boss 4 is formed in the direction of penetration of the mounting hole 3, plating is deposited only on the tip of the clamping portion 71b, preventing plating from being deposited around the clamping portion 71b protruding from the mounting hole 3. This makes it easier to remove the plating scorch prevention jig 1 after the plating process.

[0033] In the plating scorch prevention jig 1 shown in FIG. 1 , bosses 4 are not formed on the third and fifth mounting holes 3 from the top. Plating tends to deposit easily on the upper and lower ends of the support posts 71 a of the hanger 71. Therefore, bosses 4 are not formed on the mounting holes 3 at intermediate positions. Furthermore, as shown in FIG. 7 (described later), when the plating scorch prevention jig 1 of the present invention is used in a curved state, not forming bosses 4 on the third and fifth intermediate mounting holes 3 makes it easier to curve the entire plating scorch prevention jig 1. In the illustrated example, a boss 4 is formed on the fourth mounting hole 3 drilled in the center. This is because, when the plating scorch prevention jig 1 is used in a curved state, it may be fastened to the tip of the clamping portion 71 b or the tip of another hooking member.

[0034] <Breakage fold line> FIG. 4 shows the broken state of the plating scorch prevention jig, where (a) is a front view, (b) is a side view, and (c) is an enlarged side view of the break line portion. The plating scorch prevention jig 1 has fold lines 5 for breaking so that one piece can be separated into multiple pieces. As shown in the figure, two fold lines 5 for breaking are formed on one plate-shaped auxiliary member 2. This is to match the length of the support 71a of one hanging tool 71. Furthermore, two or more mounting holes 3 are drilled in the smallest unit of the plate-shaped auxiliary member 2.

[0035] As shown in the enlarged side view of Fig. 4(c), these breakable fold lines 5 are formed by thinning several places on the plate-shaped auxiliary member 2. When the plate-shaped auxiliary members 2 on both sides are bent at or above a predetermined angle so as to sandwich the breakable fold line 5, they can be easily broken and separated.

[0036] As shown in Figure 4(c), in the case of a plate-shaped auxiliary member 2 with a plate thickness of 2 mm, the specific numerical value of the breakage fold line 5 is such that the thickness of the breakage fold line 5, i.e., the depth of the cut, is 1 mm, which is about half the plate thickness of the plate-shaped auxiliary member 2. This is to ensure that when the plate-shaped auxiliary member 2 is bent, it does not break at the mounting hole 3, which is the weakest part of the plate-shaped auxiliary member 2, but rather breaks easily at the breakage fold line 5. Conversely, this is to maintain a predetermined rigidity in the plate-shaped auxiliary member 2. It is also to prevent the plate-shaped auxiliary member 2 from breaking at the breakage fold line 5 when it is used in a curved state.

[0037] The shape of the valley of the breakage fold line 5 is formed so that it expands to an angle of about 70 degrees in cross section. However, these numerical values ​​are merely examples and are not limited to these values. The actual values ​​will vary depending on the material of the plating scorch prevention jig 1.

[0038] <Variation 1> FIG. 5 shows a modification of the plating scorch prevention jig of Example 1, where (a) is a front view, (b) is a side view, and (c) and (d) are enlarged perspective views of the rounded portion. In this modified example of the plating scorch prevention jig 1, rounded portions 6 are formed on the longitudinal ends of the plate-shaped auxiliary member 2 to prevent plating from being deposited locally. In the plating scorch prevention jig 1 in which rounded portions 6 are formed on the longitudinal ends of the plate-shaped auxiliary member 2 of the hanging tool 71, plating scorch does not occur on the plate-shaped auxiliary member 2 itself. Therefore, by depositing plating uniformly on the plate-shaped auxiliary member 2 as well, plating scorch can be efficiently prevented from occurring. [Example]

[0039] FIG. 6 is a flow diagram of a plating method using a plating scorch prevention jig to prevent scorching. The plating method of the present invention is a method of plating a resin molded product W while using a plating burn prevention jig 1 to prevent plating from being deposited under conditions of excessive current density when wet plating the resin molded product W in a plating tank 72. First, the resin molded product W to be plated is attached to the clamping portion 71b of the hanger 71, and the hanger 71 is hung in the plating tank 72. At this time, as described above, the number of plating scorch prevention jigs 1 and whether or not they are broken are checked and adjusted according to the length of the support portion 71a of the hanger 71. The clamping portion 71b of the hanger 71 is inserted into the mounting hole 3 of the plate-shaped auxiliary member 2.

[0040] The hanging tool 71 prepared in this manner is placed at the end of the plating tank 72, as shown in Figure 3. The plating scorch prevention jig 1 is placed in the plating tank 72 around the hung resin molded article W. In other words, the plating scorch prevention jig 1 is placed between the resin molded articles W arranged in the plating tank 72 and the electrode plate 73. Of course, this is to prevent excessive current density from occurring in the resin molded articles W.

[0041] The plating method shown in Fig. 6 is suitable when the jig 1 for preventing plating scorching and the resin molded product W are made of the same material and undergo the same plating process. In this illustrated method, the treatment of the jig 1 for preventing plating scorching can be started simultaneously with the plating of the resin molded product W.

[0042] FIG. 7 is a flow chart of another method for plating while preventing scorching by using a jig for preventing scorching. The plating method shown in Figure 7 is a working method when the jig 1 for preventing plating scorch and the resin molded product W are made of different materials and undergo different plating processes. Preparation work for the jig 1 for preventing plating scorch is carried out in advance, separate from the plating work for the resin molded product W. A hanging tool 71 to which the jig 1 for preventing plating scorch with electroless plating is attached is hung in a plating tank 72, for example, from the copper plating step in the plating work for the resin molded product W. Either method can prevent plating scorch on the resin molded product W and ensure a uniform plating film thickness. It should be noted that the plating method shown in FIGS. 6 and 7 is merely an example, and the present invention is not limited to these processing operations and steps.

[0043] FIG. 8 is a cross-sectional view showing another example of the arrangement of a resin molded product and a plating scorch prevention jig attached to a plating hanger in a plating tank. The placement of the plating scorch prevention jig 1 is not necessarily limited to the end of the plating tank 72, i.e., a position adjacent to the electrode plate 73, as shown in FIG. 3 . As shown in FIG. 8 , the plating scorch prevention jig 1 can be placed on the upper side or the lower side (bottom) of the plating solution in the plating tank 72. Specifically, the plating scorch prevention jig 1 is placed above the top resin molded product W hung on the hanging fixtures 71, hanging across several hanging fixtures 71. The plating scorch prevention jig 1 is also placed below the bottom resin molded product W hung on the hanging fixtures 71, hanging across several hanging fixtures 71. Alternatively, the plating scorch prevention jig 1 can be placed directly on the bottom of the plating tank 72. By placing the plating scorch prevention jig 1 so as to surround the resin molded product W, excessive current density can be prevented from occurring all around the resin molded product W.

[0044] The arrangement method shown in Fig. 8 differs from the method of attaching plating scorch prevention devices (electrolysis concentration prevention devices) to the upper and lower positions of the hanging device 71 shown in the conventional example of Fig. 13. The plating scorch prevention jig 1 of the present invention can be hung on multiple hanging devices 71. Note that the same plating scorch prevention effect can be achieved even when the plating scorch prevention jig 1 is not hung on the hanging device 71 but is placed above and below the plating tank 72.

[0045] FIG. 9 is an explanatory plan view showing a state in which the plating scorch prevention jig 1 is used by bending it along the outline of the resin molded product W to be plated. Some resin molded products W are as large as 300 to 500 mm. When plating such large resin molded products W using the plating scorch prevention jig 1 of the present invention, the jig is curved along the outline of the resin molded product W. By curving the plating scorch prevention jig 1, the distance between the plating scorch prevention jig 1 and the part of the resin molded product W where the plating is deposited becomes closer, thereby eliminating problems caused by excessive current density. Although not shown, the plating scorch prevention jig 1 of the present invention is not necessarily limited to being attached to the hanging tool 71 for use as shown in Figures 2 and 3. It is sufficient that the jig be placed and fixed near the resin molded product W so as to prevent excessive current density from occurring in the plating tank 72.

[0046] It should be noted that the present invention is not limited to the above-described embodiments of the invention, and can of course be modified in various ways without departing from the spirit of the present invention, provided that the plating scorch prevention jig 1 is placed in the plating tank 72 and the plating scorch prevention jig 1 is able to reduce the excessive current density generated in the plating tank 72, thereby preventing plating scorch from occurring on the resin molded product. [Industrial Applicability]

[0047] The plating scorch prevention jig of the present invention and the plating method using the same can be used when wet plating metal products in addition to resin molded products. [Explanation of symbols]

[0048] 1. Plating burn prevention jig 2 Plate-shaped auxiliary member 3 mounting holes 4. Boss 5 Breaking line 6. R Section 71 Hanging device 71b Clamping part 72 Plating tank 73 Electrode plate W resin molded product

Claims

1. A plating scorch prevention jig (1) for preventing scorching of a resin molded article (W) hung on a hanger (71) when the resin molded article (W) is wet-plated in a plating tank (72), comprising: a rectangular plate-like auxiliary member (2) that is disposed adjacent to the hanger (71) to which the resin molded product (W) is attached in the plating tank (72) and that actively deposits plating; and mounting holes (3) formed in a plurality of locations on the plate-shaped auxiliary member (2) into which the tips of the clamping portions (71b) attached to the support portions (71a) of the hanging tool (71) can be detachably inserted, The plating scorch prevention jig (1) is arranged adjacent to a resin molded product (W) during plating treatment, and plating is actively deposited on the plating scorch prevention jig (1), thereby preventing plating from being deposited on the resin molded product (W) in a state where an excessive current density is generated.

2. 2. The plating scorch prevention jig according to claim 1, wherein a rounded portion (6) is formed at the longitudinal end of the plate-shaped auxiliary member (2) to prevent plating from being deposited locally.

3. 2. The plating scorch prevention jig according to claim 1, wherein the plate-shaped auxiliary member (2) is formed with a break line (5) for breaking so that the plate-shaped auxiliary member (2) can be easily broken and separated into a plurality of pieces.

4. 2. The plating scorch prevention jig according to claim 1, wherein the plate-shaped auxiliary member (2) is a plate-shaped member made of synthetic resin having a flexibility sufficient to be bent to fit the outer shape of the resin molded product (W).

5. 2. The plating scorch prevention jig according to claim 1, wherein a cylindrical boss (4) is formed in the mounting hole (3) of the plating scorch prevention jig (1) at the tip of the clamping portion (71b) of the hanging tool (71) inserted into the mounting hole (3) to prevent plating from being locally deposited.

6. A plating method for preventing scorching of a resin molded article (W) by using a plating scorch prevention jig (1) when wet plating the resin molded article (W) in a plating tank (72), comprising: First, the resin molded product (W) to be plated is attached to the clamping portion (71b) of the hanging tool (71), and the hanging tool (71) is hung in the plating tank (72). The plate-shaped auxiliary member (2) of the plating scorch prevention jig (1) is placed in the plating tank (72) around the resin molded product (W) hung on the hanging tool (71), With the plating scorch prevention jig (1) in place, wet plating is performed, A plating method using a plating scorch prevention jig, characterized in that plating is actively deposited on the plate-shaped auxiliary member (2) of the plating scorch prevention jig (1), while preventing plating from being deposited in a state where an excessive current density is generated in the resin molded product (W).

7. 7. The plating method using the plating scorch prevention jig according to claim 6, wherein the plating is performed by placing the plating scorch prevention jig (1) in a position adjacent to an electrode plate (73) placed in the plating tank (72).

8. 7. The plating method using a plating scorch prevention jig according to claim 6, wherein the plating is performed by placing the plating scorch prevention jig (1) above and below the hanging tool (71).

9. 7. The plating method using a plating scorch prevention jig according to claim 6, wherein the plating scorch prevention jig (1) is curved along the outline of the resin molded product (W) to be plated and placed in the plating tank (72).

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