JPH02167727A - Preparation of resin panel member - Google Patents

Abstract

PURPOSE:To perform electrostatic painting by securing the conductivity between an outer panel and an inner panel without bringing about the deterioration of appearance by providing piercing holes communicating with each other to both outer and inner panels and introducing a conductive adhesive into said piercing holes. CONSTITUTION:Paint having electric conductivity is injected in a small space to form a conductive coating layer A to the surface 2d of an outer panel 2. An inner panel 3 is also molded into a predetermined shape and a pin is allowed to protrude in a mold at the time of molding to preliminarily provide a piercing hole 6. The position of the piercing hole 6 is set so that the positions of both piercing holes 5, 6 coincide when the inner panel 3 is bonded to the outer panel 2. At the coating time of a conductive adhesive B and at the time of the adhesion and pressing of the inner panel 3, the conductive adhesive B is introduced into the piercing hole 5 of the outer panel 2 through the gaps between arms 8c. After the conductive adhesive B is applied, the inner panel 3 is pressed to the rear 2a of the outer panel 2 while the positions of both piercing holes 5, 6 coincide to bond both panels 2, 3.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a manufacturing method for molding panel members used for vehicle body outer panels etc. with resin, and particularly relates to a manufacturing method for molding panel members used for vehicle body outer panels, etc. The present invention relates to an improvement in a manufacturing method for joining materials and applying electrostatic coating or electromagnetic shielding to both the front and back surfaces of the panel material.

(Prior art) In general, panel members such as automobile bonnets and trunk lids are often made of sheet metal, and when painting them, electrostatic coating, which applies paint while charging the panel members, and corrosion-resistant coating are used. Electromagnetic shielding is performed by applying a coating material.

On the other hand, in recent years, there has been a growing demand for this panel member to be molded from a resin material for the purpose of reducing vehicle weight and preventing corrosion. Since this resin panel member is inferior in strength to a metal one, in order to compensate for this, two panels, an outer and an inner panel, are bonded together. There is.

Also, during the painting process as one of the manufacturing steps,
In order to enable various surface treatments to be applied to these panel members in a conventional painting line, the outer and inner panels must be configured to be electrically conductive. and,
To achieve this objective, in the conventional manufacturing method, the outer panel of the resin panel member is first injection molded in a mold consisting of an upper mold and a lower mold, and then the upper mold of the mold is slightly raised. After forming a small space between the outer panel surface and the upper mold, and performing so-called in-mold coating, in which conductive paint is injected into the small space and the outer panel surface is painted, as shown in Fig. 7. As shown in FIG. That is, a conductive primer h is applied as a corrosion prevention means over the back surface f of the inner panel C, the overflowing adhesive d1, and the conductive paint i applied to the outer panel a via the outer periphery g of the outer panel a. The overflowing adhesive d is used as a medium to ensure conductivity between the outer panel a and the inner panel C, making it possible to apply it to existing electrostatic coating lines. Further, as an example of the conventional technology related to in-mold coating, in which a panel material is molded in a mold as described above and the panel material is coated within the same mold, there is a method as disclosed in Japanese Patent Publication No. 59-23552. There are in-mold coating devices and coating methods.

(Issue 8 to be solved by the invention) However, with the method described above, not only the overflowing adhesive is visible from the outside, but also the overflowing adhesive may protrude from the back surface of the inner panel. , the area around the area is no longer flush, and the appearance is significantly impaired, making it impractical. Although it is conceivable to cut the overflowing adhesive so that it is flush with the back surface of the inner panel after it has hardened, this operation is complicated, resulting in an increase in processing cost. In addition, in order to ensure electrical conductivity between the outer panel and the inner panel, the adhesive must be filled in so as to fill the opening between the end face boundary parts, and if the dimension between the end face boundary parts is large, A large amount of adhesive is required, and in order to reduce the amount of adhesive used, the shape of the inner panel must be made to approximate the shape of the outer panel, and it must be molded with high dimensional accuracy to obtain the end face boundary of the predetermined dimensions. In either case, this will lead to an increase in processing costs.

Therefore, the present invention provides through-holes that communicate with each other in the outer panel and the inner panel, and injects a conductive adhesive into the through-holes to improve the conductivity between the two panels without deteriorating the appearance. The purpose is to secure and enable electrostatic painting.

(Means for Solving the Problem) In order to achieve the above object, the method according to the solution taken by the present invention is a method for manufacturing a panel member comprising an outer panel and an inner panel made of resin, the outer panel being After forming a conductive WS layer on the surface of the outer panel with a through hole drilled in the adhesive part with the inner panel, the inner panel with the through hole drilled in the position corresponding to the through hole of the outer panel is attached to the back side of the outer panel. This is characterized in that each through hole is filled with a conductive adhesive and bonded.

(Function) With the above configuration, in the present invention, the outer panel and the inner panel are bonded using a conductive adhesive, and the through holes are provided in alignment with each other in the bonded portion of both panels, and each of the through holes is Since it is filled with a conductive adhesive, the conductive adhesive enters the inner through hole, thereby achieving conductivity between the conductive layer of the outer panel and the inner panel. Therefore, the panel member can be painted using a conventional painting line, and the resin panel member can be electrostatically coated and electromagnetically shielded at low cost without damaging its appearance.

(Example) Next, an example of the present invention will be described with reference to the drawings.

Incidentally, the panel member in this embodiment is an automobile bonnet.

As shown in FIG. 2, the bonnet 1 molded by the method of the present invention is molded from resin in order to reduce the weight of the vehicle. Inner panels 3, 3, also made of resin, are adhered to two locations to improve strength. In addition, the front edge 2b of the bonnet 1 is an island attached to the vehicle body that is slightly curved toward the inner panel 3, while the rear end 2C is hinged to the vehicle body and connects to the lid of the engine compartment (not shown). It is what it is.

Next, the manufacturing operation of the bonnet 1 according to the manufacturing method of the present invention will be explained.

First, when molding the outer panel 2, as shown in FIG. 3(a), the molding space 4C of the outer panel 2 is filled by an upper mold 4a and a lower mold 4b having a bottle P that is elastically supported and can be moved up and down. Using the mold 4 to form the
), the outer panel 2 is molded by injecting the molten resin material R into the molding space 4C. In addition, the above-mentioned bottle P is a spring etc. buried in the lower mold 4b (palindrome omitted)
It is elastically supported by the upper mold 4 when resin material is injected.
The outer panel 2, which is molded to be held in a position where it is always in contact with the outer panel a, is provided with a through hole 5 that penetrates from the front surface 2d to the back surface 2a.

After the outer panel 2 is cured in the molding space 4c of the mold 4, the bottle P
At the same time, the upper mold 4a is slightly raised so as to be separated from the surface 2d of the outer panel 2, and the surface 2d is placed between the upper mold 4a and the surface 2d of the outer panel 2. A small space S is formed over the entire surface. Then, as shown in FIG. 3(d), a conductive coating material is injected into the small space S to form a conductive coating layer A on the surface 2d of the outer panel 2. Additionally, glass fibers are mixed into the paint that forms this conductive coating layer A to improve the heat resistance of the outer panel by coating the surface of the heat-sensitive resin. This ensures that the paint and electromagnetic coating will not be affected. On the other hand, the inner panel 3 is also molded into a predetermined shape using a mold for inner panels (not shown). When molding this inner panel 3, a bottle is made to protrude into the mold in the same manner as the outer panel 2, and a through hole 6 (FIG. 4(b)
)) should be drilled. The position of the through hole 6 is set so that the position of the device through hole 5.6 coincides with the position of the device through hole 5.6 when the inner panel 3 is attached to the outer panel 2. Each panel formed in this way is shown in Figures 4(a) and (b).
As shown in FIG. 4(a), the front edge 2b of the outer panel 2 (FIG. 4(a)) is slightly curved toward the back side, and the conductive coating layer A is formed on the entire surface 2d including the curved surface. .

Furthermore, since the through hole 5 does not penetrate through the conductive coating layer A but only through the outer panel 2, the conductor 711S
A part of the coating layer A is provided so that it can be seen through the through hole 5 from the back side of the outer panel 2. On the other hand, the inner panel 3 (FIG. 4(b)) is unpainted on both the front surface 3a and the back surface 3b, is formed smaller than the outer panel, and has the above-mentioned through holes 6 at predetermined positions. has been done.

Next, a description will be given of an operation for bonding the outer panel 2 and inner panel 3 formed as described above.

First, as shown in FIG. 135, the outer panel 2 is placed on the work base 7 with its back surface 2a facing upward.

Further, an air venting member installation portion 2e formed of an annular groove is provided around the through hole 5.
An air bleed member 8 is installed at e, and a conductive adhesive B having conductivity is applied from above. To explain the air bleed member 8, as shown in FIG. 6, the air bleed member 8 includes a ring-shaped support part 8a and a cylindrical air circulation part 8b whose upper part is closed and extends downward from the support part 8a. The support part 8a is formed of a ring-shaped member with a circular cross section that is fitted into the air venting member installation part 2e, and is connected to the air circulation part 8b by four arms 8c,
When applying the conductive adhesive B and suppressing adhesion of the inner panel 3, the conductive adhesive B enters the through hole 5 of the outer panel 2 through the arms 80. The conductive adhesive B that has entered the through hole 5 displaces the air E in the through hole 5 and comes into contact with the back side of the conductive coating layer A. This displaced air E is moved to the cylindrical internal space of the air circulation part 8b and is located in the upper part of the cylindrical interior.

After applying the conductive adhesive B, the inner panel 3 is pressed while aligning the positions of the prize holes 5.6 toward the back surface 2a of the outer panel 2 to adhere both panels 2.3. Due to this pressing force at the time of adhesion, the conductive adhesive B is filled in the above-mentioned through holes 5° 6 so as not to leave any air, thereby connecting the conductive coating layer A of the outer panel 2 and the inner panel 3.
Electricity is established between the back surface 3b and the conductive adhesive filled up to the road surface. Finally, a conductive primer C is applied to the entire back surface 3b of the inner panel 3 to improve corrosion resistance, and the surface 2d side of the outer panel 2 and the back surface 3b side of the inner panel 3 are The through holes 5 and 6 are made conductive and can be applied to existing electrostatic coating lines. What is shown in FIG. 1 is the state of the bonnet formed by the above-mentioned work before the painting work. In addition, on the back surface 2a of the outer panel 2, a dam 2f is provided around the through-hole 5 to block the outflow of the conductive adhesive B to the outside of the panel so as to ensure that the conductive adhesive B can enter each of the through-holes 5 and 6. (Fig. 5) is desirable; on the other hand,
The surface 3a of the inner panel 3 is provided with a recess 3c (FIG. 1) for accommodating excess conductive adhesive B. In this way, during electrostatic painting, electricity is passed across the conductive coating layer A, which is the entire surface of the outer panel surface 2d, and the conductive primer layer C, which is the entire surface of the inner panel back surface 3b, so that both surfaces 2d,
3b can be electrostatically coated or electromagnetic shielded. Therefore, when a bonnet is formed and painted using the manufacturing method described above, there will be no protrusions on each surface due to adhesive overflowing onto the surface of the outer panel and the back surface of the inner panel, unlike conventional methods. This results in a bonnet with improved appearance.

In this example, a bonnet has been described, but the present invention is not limited to this, and can be applied to manufacturing various vehicle body panels such as a trunk lid. Furthermore, the inner panel is not limited to two panels.

(Effects of the Invention) As described above, according to the method for manufacturing a resin panel member of the present invention, after forming a conductive layer on the surface of the outer panel with a through hole formed in the bonded portion of the outer panel to the inner panel, The inner panel, which has through holes formed at the same positions as the through holes in the outer panel, is bonded to the back surface of the outer panel while filling each through hole with a conductive adhesive. The conductive layer and the inner panel can be electrically conductive, and panel members can be painted using conventional painting lines, allowing for electrostatic painting and painting of resin panel members at low cost without damaging the appearance of the joints between both panels. This has the effect of enabling electromagnetic shielding and improving the practicality of the resin panel member.

[Brief explanation of the drawing]

Figures 1 to 6 show one embodiment of the present invention, with Figure 1 being a longitudinal sectional view of the vicinity of the front end of the bonnet, Figure 2 being a perspective view of the bonnet seen from the back, and Figure 3 being a view of the outer panel. Figure 4 is a longitudinal cross-sectional view of the outer panel and inner panel, Figure 5 is a vertical cross-sectional view showing the working state when bonding the inner panel to the outer panel, and Figure 6 is a perspective view of the air bleed member. It is. FIG. 7 is a longitudinal sectional view of the vicinity of the front end of a conventional resin bonnet. 1... Bonnet (panel member), 2... Outer panel, 3... Inner panel, 5, 6... Through hole, A
... Conductive coating layer (conductive layer), B... Conductive adhesive. Figure (Q) (C) (b) (d)

Claims (1)

[Claims] (1) A method for manufacturing a panel member consisting of an outer panel and an inner panel made of resin, wherein a conductive layer is formed on the surface of the outer panel with a through hole formed in the adhesive part of the outer panel and the inner panel, and then the A method for manufacturing a resin panel member, which comprises bonding an inner panel having through holes formed at positions corresponding to through holes in an outer panel to the back surface of an outer panel while filling each through hole with a conductive adhesive.