JP2010274807A - Elongated vehicle exterior equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elongated vehicle exterior equipment having an excellent dimensional stability. <P>SOLUTION: The surface of an elongated resin substrate 2 is covered with a metal plating layer 3. A coating film 4 is formed on the surface of the metal plating layer 3. The thickness of the metal plating layer 3 in a midportion (P portion) of the resin substrate 2 is preferably 5 μm or more. The ratio (A/B) of thickness A of the metal plating layer formed on the surface of a cross section in a thickness direction of the resin substrate 2 and thickness B of the metal plating layer formed on the rear surface of the cross section in the thickness direction of the resin substrate is preferably 0.2-5. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a long vehicle exterior product formed by forming a coating film on the surface of a resin base material.

  For example, a back door garnish which is a vehicle exterior product is a large long product having a width of 80 cm or more. The back door garnish is made of a resin base material, and is given various colors and gloss by painting on the surface.

  When such a large-sized resin product is exposed to a high temperature, the entire length increases. Other parts adjacent to the large long product may be a plate-like body made of metal or the like, and may have a linear expansion coefficient different from that of the large long product. In this case, the large and long product may interfere with other adjacent components. In order to prevent interference, it is necessary to increase the gap between the back door garnish and other adjacent parts to some extent. When this gap is large, the appearance of the vehicle is affected. Therefore, it is required to improve the dimensional stability of the back door garnish.

  Therefore, conventionally, as disclosed in Patent Document 1, it has been proposed to impregnate short glass fibers in a resin base material.

JP 2008-202013 A

  The inventor of the present application has eagerly searched for improving the dimensional stability of a resin-made long product by a method different from that of Patent Document 1.

  This invention is made | formed in view of this situation, and makes it a subject to provide the elongate vehicle exterior goods excellent in dimensional stability.

  The long vehicle exterior product of the present invention has a coating film formed on the surface of a long resin base material and is attached adjacent to a component having a lower linear expansion coefficient than the resin base material. In the product, the surface of the resin substrate is covered with a metal plating layer, and the coating film is formed on the surface of the metal plating layer.

  According to the said structure, the surface of the resin base material is coat | covered with the metal plating layer, and the coating film is formed on the metal plating layer. Since the metal plating layer covers the entire surface of the resin base material, it suppresses the elongation of the resin base material. Therefore, the elongation of the resin base material due to heat can be suppressed, and the long vehicle exterior product is excellent in dimensional stability.

  In addition, when a long vehicle exterior product is mounted adjacent to another component, it is between the other component having a linear expansion coefficient lower than that of the resin base material and the long vehicle exterior product coated with the metal plating layer. The gap can be reduced, and the design is improved.

  The thickness of the metal plating layer in the central portion of the resin base material is preferably 5 μm or more. In this case, since the metal plating layer has a sufficient thickness to suppress the elongation amount of the resin base material, the elongation of the resin base material due to heat can be further effectively suppressed.

  Ratio (A / B) of the thickness A of the metal plating layer that covers the surface of the cross section in the thickness direction of the resin base material and the thickness B of the metal plating layer that covers the back surface of the cross section in the thickness direction of the resin base material ) Is preferably 0.2-5.

  In this case, the difference between the thickness of the metal plating layer covering the surface of the cross section in the thickness direction of the resin base material and the thickness of the metal plating layer covering the back surface of the cross section in the thickness direction of the resin base material can be suppressed. Therefore, when exposed to a high temperature, elongation is suppressed to approximately the same extent on the front and back surfaces of the resin base material. Therefore, the difference in elongation between the front surface and the back surface of the resin base material is reduced, the warpage of the resin base material can be effectively suppressed, and the dimensional stability is excellent.

  According to the present invention, the surface of the resin substrate is covered with the metal plating layer, and the coating film is formed on the metal plating layer. For this reason, the long vehicle exterior goods excellent in dimensional stability can be provided.

It is a perspective view of the trunk lid which attached the back door garnish of Example 1 of the present invention. 1 is a perspective view of a back door garnish of Example 1. FIG. It is AA arrow sectional drawing of FIG. It is a BB arrow sectional view of Drawing 3. It is sectional drawing (a) of the resin base material attached to the jig | tool for plating of Example 1, and front arrangement | positioning drawing (b) of the resin base material attached to the jig | tool for plating. It is explanatory drawing which shows the elongation amount at the time of 80 degreeC of the back door garnish of Examples 1-3 and the comparative example 1. FIG. It is sectional drawing (a) of the resin base material attached to the jig | tool for plating of Example 4, and front arrangement | positioning figure (b) of the resin base material attached to the jig | tool for plating.

  The long vehicle exterior product of the present invention is obtained by coating the surface of a resin base material with a metal plating layer and forming a coating film on the surface of the metal plating layer.

  The resin base material is a long vehicle body exterior product. Examples of the vehicle body exterior product include large and long products such as a vehicle back door garnish, a grill, and a side molding.

  The present invention is applied to an elongated vehicle exterior product. The length of the vehicle exterior product is suitably applied, for example, when it is 800 mm or more. When the length is 800 mm or more, the amount of elongation due to heating is large when the resin substrate is not covered with the metal plating layer. For this reason, when the vehicle body exterior product is assembled to the vehicle body, it is necessary to increase the gap between the other adjacent vehicle body parts in consideration of the elongation amount of the resin base material, and the external appearance of the vehicle is reduced by the gap. There is a fear. Therefore, when the length of the resin base material is 800 mm or more, it is required to reduce the amount of elongation at high temperatures. As the length of the vehicle exterior product becomes longer, a reduction in the amount of elongation is required.

  Since the vehicle exterior product of the present invention covers the surface of the resin base material with a metal plating film, the amount of elongation of the resin base material at a high temperature can be suppressed. Therefore, even if the gap between the adjacent vehicle parts is narrowed when assembled to the vehicle, the resin base material does not interfere with the adjacent vehicle parts due to the elongation of the resin base material. Therefore, the external appearance of the vehicle can be improved by setting a narrow gap between the vehicle exterior product of the present invention and the adjacent vehicle parts.

  The resin substrate has a length of 800 mm or more, but the width and thickness are not particularly limited.

  Examples of the material of the resin base material constituting the vehicle exterior product include ABS resin (acrylonitrile / butadiene / styrene resin). From the viewpoint of dimensional stability and rigidity, it is preferable to use an ABS resin.

  The entire surface of the resin base material is covered with a metal plating layer. The thickness of the metal plating layer on the surface of the central part of the resin base material is preferably 5 μm or more. The central part of the resin base material is the central part in the longitudinal direction of the long resin base material and the central part in the height direction. The reason why the thickness of the metal plating layer covering the central portion of the resin base material is defined is that the thickness of the metal plating layer covering the central portion of the resin base material is relatively stable. On the other hand, the end portion of the resin base material has a tendency that the thickness of the metal plating layer is thicker than that of the central portion, and the change in thickness is large. For this reason, the thickness of the metal plating layer is defined at the central portion of the resin base material, which is the portion where the thickness of the metal plating layer is stable.

  The shape of the central portion of the resin base material is preferably, for example, a planar shape. In this case, the thickness of the metal plating layer covering the central part of the resin base material is further stabilized.

  For example, the central portion is a flat portion similar to the license plate, such as a back door garnish having a plate holding portion that holds the license plate in the central portion. Thus, in the vehicle exterior product having a flat portion at the center portion exemplified in the back door garnish, the “thickness of the metal plating layer covering the center portion of the resin base material” is formed at the center portion of the resin base material. It becomes the thickness of the metal plating layer which coat | covers a plane part. The central part of the resin base material is thinner than the thickness of the metal plating layer covering the end part of the resin base material, for example, and the thickness is stable. By setting the thickness of the central metal plating layer to 5 μm or more, the entire resin base material is covered with the metal plating layer, and the elongation of the resin base material can be effectively suppressed.

  The thickness of the metal plating layer covering the central part of the resin substrate is 5 μm or more. Thereby, the elongation amount of the resin base material at the time of high temperature is suppressed.

  Furthermore, the thickness of the metal plating layer covering the central portion of the resin base material is preferably 6 μm or more. In this case, the elongation of the vehicle exterior product at a high temperature can be effectively suppressed.

  Let A be the thickness of the metal plating layer formed on the surface of the cross section in the thickness direction of the resin substrate. Let B be the thickness of the metal plating layer formed on the back surface of the cross section in the thickness direction of the resin substrate. A and B are the thickness of the metal plating layer which coat | covers the surface and back surface of the same thickness direction cross section of a resin base material. The “cross section in the thickness direction of the resin base material” is not limited to the cross section in the thickness direction of the “central part of the resin base material” but may be a cross section in the thickness direction of the end portion of the resin base material. Moreover, when it is the resin base material which has an unevenness | corrugation, the thickness direction cross section of a recessed part and a convex part may be sufficient.

  The ratio of A and B (A / B) is preferably 0.2-5. In this case, there is less variation between the thickness of the metal plating layer covering the surface and the thickness of the metal plating layer covering the back surface in the same cross section in the thickness direction of the resin base material. Therefore, the front and back elongation in the same cross section of the resin base material can be suppressed uniformly, and the resin base material is less likely to warp.

  The ratio of A / B is preferably 0.2 to 5 in the cross section in the thickness direction at all the end portions extending in the longitudinal direction of the resin base material. In this case, the warp of the resin base material can be more effectively suppressed.

  The ratio of A / B is further preferably 0.5-3. In this case, the warpage of the vehicle exterior product can be further suppressed.

  In forming the metal plating layer so that the A / B ratio is within the above range, when a plurality of resin substrates are simultaneously plated in the plating tank, the plurality of resin substrates are overlapped with each other. It is good to arrange so that it does not become.

  Although the structure of a metal plating layer is not specifically limited, For example, it may be comprised only from Cu, may be comprised by Cu and Ni, and may be comprised from Cu, Ni, and Cr. .

  The linear expansion coefficient of the metal material constituting the metal plating layer is smaller than the linear expansion coefficient of the resin material constituting the resin base material. For this reason, it is thought that the elongation by the heat | fever of a resin base material can be suppressed.

  A well-known method can be employ | adopted for the formation method of a metal plating layer.

  A coating film is formed on the surface of the metal plating layer. The coating film may be formed on the entire surface of the metal plating layer or may be formed on a part of the surface. Examples of the method for forming the coating film include electrodeposition coating. The coating film imparts various colors and gloss to the vehicle exterior product. The thickness of the coating film is not particularly limited. Like a resin base material, since a coating film is extended at high temperature, compared with a metal plating layer, there are few elongation inhibitory effects.

Example 1
As shown in FIGS. 1 and 2, the vehicle exterior product of this example is a back door garnish of an automobile. The back door garnish 1 is assembled to a trunk lid 71 that covers a trunk provided at the rear of the vehicle body. The back door garnish 1 is a long body that is long in the vehicle width direction, and a plate holding portion 11 that fixes a number plate is provided at the center in the width direction. A rear combination lamp 72 is attached to the upper side of both end portions in the width direction of the back door garnish 1. The back door garnish 1 is a large long product having a length in the width direction of 1200 mm and a size in the height direction of 320 mm.

  As shown in FIG. 3, the back door garnish 1 includes a resin base material 2 made of ABS resin, a metal plating layer 3, and a coating film 4. The metal plating layer 3 covers the entire surface of the resin substrate 2. As shown in FIG. 4, the metal plating layer 3 includes a copper plating layer 31, a nickel plating layer 32, and a chromium plating layer 33.

  The point P shown in FIGS. 2 and 3 on the surface 2a of the plate holding portion 11 of the resin base material 2 indicates the central portion of the resin base material 2. The center part of the resin base material 2 indicated by the point P is the center part in the width direction of the back door garnish 1 and the center part in the height direction, which is a flat part. At point P, the thickness of the copper plating layer 31 is 10 μm, the thickness of the nickel plating layer is 10 μm, and the thickness of the chromium plating layer 33 is 0.1 to 0.2 μm. The total thickness of the metal plating layer 3 at the point P is 20 μm.

  The coating film 4 is formed on the metal plating layer 3 that covers the surface 2 a of the resin substrate 2. The coating film 4 exhibits the same color as that of the surface of the trunk lid 71. The back surface 2b of the resin base material 2 is only covered with the metal plating layer 3, and the coating film 4 is not formed. The metal plating layer 3 is exposed on the back surface 2 b of the resin base material 2.

  In manufacturing the back door garnish 1, first, an ABS resin is injection-molded to form the resin base material 2 in the shape of a back door garnish.

  Next, as shown in FIG. 5A, the resin base material 2 is attached to the plating jig 6. The plating jig 6 is configured to be able to lock a plurality of resin base materials 2. For example, unillustrated locking portions for locking the resin base material 2 are provided at a plurality of locations on both the front and back surfaces of the plating jig 6. Two resin base materials 2 are engaged with the upper and lower stages on one side of such a plating jig 6 by reversing the vertical direction. As shown in FIG. 5B, the upper end 2d and the lower end 2e of the upper resin base 2 and the lower resin base 2 were separated so as not to overlap each other.

  Next, the processing steps were performed in the following order for the resin base material locked to the plating jig 6. First, the resin substrate was immersed in the adjustment liquid to remove dirt such as fingerprints and oil from the surface of the resin substrate. Next, the resin base material was immersed in an etching solution, and the surface of the resin base material 2 was chemically roughened with chromic acid to form a roughened surface. Next, the etching solution was neutralized with an acid, and hexavalent chromium was removed from the surface of the resin base material by reduction. A catalyst was applied to the resin substrate, and the Pd / Sn compound was adsorbed on the surface of the resin substrate. An accelerator treatment was performed to remove Sn adhering to the surface of the resin base material, and Pd adhering to the resin base material surface was metallized. Next, chemical nickel plating was performed, and Pd adhering to the resin base material surface was used as a catalyst to form a nickel thin layer by a chemical reaction. Thus, the preprocessing ends.

  Next, the electroplating process was performed as follows. The following electroplating treatment was performed by immersing in each plating solution while energizing the plating film on the surface of the resin substrate. First, acid activation treatment was performed. Next, as shown in FIG. 4, nickel strike plating was applied to the surface of the nickel thin layer to reinforce the nickel thin layer and to lower the electrical resistance of the plating layer. Next, the copper plating layer 31 was formed on the surface of the nickel strike plating layer. Next, semi-bright nickel plating, bright nickel plating, and joule nickel plating were performed to form a nickel plating layer 32 on the surface of the copper plating layer 31. Chrome plating was performed to form a chromium plating layer 33 on the surface of the nickel plating layer 32. Next, these plating layers were taken out from the treatment liquid and dried. The resin substrate 2 after the plating treatment was removed from the plating jig 6. As described above, the entire surface of the resin base material 2 was covered with the metal plating layer 3 composed of the copper plating layer 31, the nickel plating layer 32, and the chromium plating layer 33.

  Next, the coating film 4 was formed on the metal plating layer 3 which coat | covers the surface 2a of the resin base material 2. FIG.

(Example 2)
In this example, the thickness of the copper plating layer 31 was 4 μm, and the thickness of the nickel plating layer 32 was 4 μm. The total thickness of the metal plating layer 3 was 8 μm. Others are the same as in the first embodiment.

Example 3
In this example, the thickness of the copper plating layer 31 was 2 μm, and the thickness of the nickel plating layer 32 was 2 μm. The total thickness of the metal plating layer 3 was 4 μm. Others are the same as in the first embodiment.

(Comparative Example 1)
In this example, a metal plating layer was not formed on the surface of the resin base material 2. The coating film 4 was directly formed on the surface 2 a of the resin base material 2.

<Measurement of elongation>
The length in the width direction of the back door garnishes of Examples 1 to 3 and Comparative Example 1 was measured. Next, as shown in FIG. 1, the back door garnish 1 was heated while being assembled to the trunk lid 71 to raise the temperature from 23 ° C. to 80 ° C. The length in the width direction of the back door garnish 1 after being held at 80 ° C. for 3 hours was measured. The ratio of the difference between the length in the width direction of the back door garnish 1 at the time of high temperature and the length of the back door garnish at the time of room temperature was determined and used as the amount of elongation. The measurement results are shown in FIG. In FIG. 6, E1, E2, E3, and C1 indicate Example 1, Example 2, Example 3, and Comparative Example 1 in this order.

  From the figure, it was found that the elongation of the resin base material can be suppressed to 1.3 mm or less by coating the surface of the resin base material with the metal plating layer. This is probably because the entire surface of the resin base material was covered with a metal plating layer having a smaller linear expansion coefficient than that of the resin base material, so that the elongation of the resin base material was suppressed.

  Furthermore, as in Examples 1 and 2, when the thickness of the metal plating layer was 5 μm or more, the elongation amount of the resin base material could be reliably suppressed. On the other hand, in Comparative Example 1, the resin base material was not covered with the metal plating layer, and the elongation was as large as 2.3 mm.

Example 4
In this example, in manufacturing the back door garnish, the resin base material 2 was locked to both the front and back surfaces of the plating jig 6 as shown in FIGS. 7 (a) and 7 (b). The resin base material 2 locked to the surface of the plating jig 6 and the resin base material 2 locked to the back surface of the plating jig 6 are arranged so that the vertical positions are the same, The entire back surface 2b was made to overlap each other. Thus, about the resin base material 2 latched by the jig | tool 6 for plating, the process process similar to Example 1 was performed.

<Measurement of metal plating layer thickness>
For the back door garnish of Examples 1 and 4, the thickness of the metal plating layer 3 was measured. As shown in FIG. 3, the thickness of the metal plating layer 3 covering the surface 2a and the back side 2b of the portions indicated by O, P and Q in the resin substrate 2 was measured. O site | part is a plane part of the vicinity of the upper end part 2d of the width direction center part of a back door garnish. P site | part is the center part of the width direction of a back door garnish, and is the center part of a height direction. The Q portion is a flat portion in the vicinity of the lower end 2e at the center in the width direction of the back door garnish.

  Table 1 shows the thicknesses of the front and back metal plating layers at the P, Q, and R sites of the back door garnishes of Examples 1 and 4, and the ratio of the front metal plating layer to the rear metal plating layer (A / B).

  From the above results, in Example 1, the A / B ratios of the metal plating layers at the O, P, and Q sites are all within the range of 0.2 to 5, and the metal plating that covers the surface of each site. There was no significant difference between the thickness of the layer and the thickness of the metal plating layer covering the back surface. The A / B ratio of the metal plating layer at the P site was smaller than the A / B ratio of the metal plating layer at the O and Q sites. This is presumably because the amount of metal plating adhered to the front and back surfaces of the resin base material was made uniform because a plurality of resin base materials were held on the plating jig so as not to overlap each other.

  Moreover, the thickness of the metal plating layer which coat | covers the surface and back surface of the resin base material in P site | part was thinner than that in O and Q site | part. That is, the thickness of the metal plating layer covering the flat central portion of the resin base material was thinner than the thickness of the metal plating layer covering the flat portion near the edge of the resin base material.

  On the other hand, in Example 4, the A / B ratio of the metal plating layer at the O and P sites was larger than 5. Moreover, the thickness of the metal plating layer which coat | covers the back surface of the resin base material in O, P site | part was as small as 5 micrometers or less. As shown in FIG. 7A, in Example 4, since the back surface 2b of the resin base material 2 was attached to the plating jig 6 in a state where the back surfaces 2b were overlapped, the plating treatment was performed. This is probably because the amount of plating attached to the central portion (P portion) of the back surface 2b and the vicinity of the upper end portion 2d (O portion) held at positions close to each other is reduced.

<Measurement of warpage>
The back door garnishes of Examples 1 and 4 were heated in a free state without being assembled to the trunk lid, and the temperature was raised from 23 ° C to 80 ° C. The amount of warpage of the back door garnish 1 after being held at 80 ° C. for 3 hours was measured. The back door garnish used for the measurement is arranged on the upper stage of the plating jig during the plating process.

  In measuring the amount of warpage of the back door garnish, the back door garnish was placed horizontally on the gauge. The position in the height direction of the upper end 2d (upper side) of the resin base material 2 with respect to the horizontal reference line and the position in the height direction of the lower end 2e (lower side) of the back door garnish were measured using a gauge. The reason for measuring the amount of warpage between the upper end portion 2d and the lower end portion 2e of the back door garnish is that this portion has a long free end and is easily warped in the back door garnish.

  As shown in FIG. 2, as a result of the measurement, the warp amount was the largest in the upper end portion 2 d of the back door garnish of Example 1, and the warp amount was −1.0 mm. In the lower end 2e, the amount of warpage was the largest at the two parts, which was -1.2 mm.

  Among the upper end portions 2d of the back door garnish of Example 4, the warp amount was the largest at the key portion, and the warp amount was 1.8 mm. Among the lower end portions 2e, the amount of warpage was the largest in the two parts and the part, both of which had a warp amount of -2.0 mm.

  In Example 1, the thickness (A) of the metal plating layer 3 covering the surface 2a of the two parts, the thickness (B) of the metal plating layer 3 covering the back surface 2b, and the A / B ratio were measured. Further, the thickness (A) of the metal plating layer 3 covering the surface 2a of the key, d, and f part of Example 4, the thickness (B) of the metal plating layer 3 covering the back surface 2b, and the A / B ratio are measured. did. These A, B, and A / B ratios are shown in Table 2 together with the amount of warpage.

  As is known from Table 2, in the case of Example 1, the amount of warpage in the upper end portion and the lower end portion of the back door garnish is in the range of −1.3 to 1.3 mm, and the comparison is made. It was much smaller than the amount of warpage in the example. The reason is that the ratio (A / B) of the thickness of the metal plating layer between the front and back of the portion with the largest amount of warpage in the back door garnish of Example 1 is in the range of 2 to 5, and there is no great difference between the front and back. This is probably because In addition, the A / B ratio was in the range of 0.2 to 5 at the upper end 2d other than the large warp 2d and the lower end 2e other than D. That is, the A / B ratio is 0.2 to 5 in the cross section in the thickness direction at all of the upper end 2d and the lower end 2e extending in the longitudinal direction of the resin base material. For this reason, it is thought that the force which suppresses the elongation by the front and back of a resin base material worked equally, and curvature was suppressed.

  On the other hand, in Example 4, since the ratio (A / B) of the thickness of the metal plating layer between the front and back surfaces in the portion where the warpage amount in the back door garnish was the largest was outside the range of 0.2 to 5, It is thought that the resin substrate warpage occurred due to an imbalance in the force to suppress the elongation of the material on the front and back.

1: back door garnish, 2: resin base material, 2a: surface, 2b: back surface, 3: metal plating layer, 4: coating film, 6: plating jig, 30: pretreatment layer, 31: copper plating layer, 32: Nickel plating layer, 33: Chrome plating layer.

Claims (3)

In a long vehicle exterior product that is formed adjacent to a component having a linear expansion coefficient lower than that of the resin base material, a coating film is formed on the surface of the long resin base material,
The surface of the resin base material is covered with a metal plating layer, and the coating film is formed on the surface of the metal plating layer.   The long vehicle exterior article according to claim 1, wherein the thickness of the metal plating layer in the central portion of the resin base material is 5 μm or more.   Ratio (A / B) of the thickness A of the metal plating layer that covers the surface of the cross section in the thickness direction of the resin base material and the thickness B of the metal plating layer that covers the back surface of the cross section in the thickness direction of the resin base material ) Is 0.2-5, The long vehicle exterior article according to claim 1 or claim 2.

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