JPS646022B2 - - Google Patents

Description

[Detailed description of the invention]

This invention is for reinforcing a plate material, particularly a plate material used for car body exterior panels such as automobile door panels and roof panels, etc., by pasting and hardening the plate material on the parts that require reinforcement and forming reinforcing ribs integrated with the plate material. Regarding the method. Conventionally, as shown in FIG.
A thermosetting resin material 4 to which a reinforcing material 3 such as glass fiber or nonwoven fabric has been attached in advance is attached to the inner surface of the door outer panel 2, which is the outer panel of the door, that is, the inner surface of the metal plate material 2a, and this resin material 4 is heated and hardened. It is known that plate materials can be reinforced by
No. 101659). In addition, 5 in the figure is the door inner panel, 6
is the door window sash, 7 is the side window glass, and 8 is the outside door handle. However, in this conventional example, the desired reinforcing effect cannot be obtained unless the thickness of the resin material 4 is considerably increased, and the amount of resin material used is large, resulting in a correspondingly high production cost and weight. There was a problem that the number of people was also increasing. As another conventional example, it is also known to adhere a reinforcing material that has been molded and hardened in advance to a plate material. However, in this case, it is necessary to mold the reinforcing material so that it perfectly matches the shape of the plate material, but such shaping is difficult, and moreover, the plate material is usually press-formed, and the amount of spring back varies depending on the press processing conditions. There was a problem in that it was very difficult to completely bond both the reinforcing material and the plate material because of the variations. Therefore, as shown in FIG.
A reinforcing rib 13 consisting of a thermosetting resin portion 11 to which glass fiber or other reinforcing material 10 has been added in advance and a foamed portion 12 is integrally formed on the inner surface of or on the anti-rust coating 9 applied to the inner surface. first proposed an automobile plate material and its manufacturing method (patent application 1984-
No. 114731). According to this proposed invention, all of the above conventional problems are solved. By the way, in order to mold this reinforcing rib 13,
A reinforcing material 14 as shown in FIG. 3 is used. This reinforcing material 14 is an uncured resin in which the reinforcing material 10 is added to an unfoamed foamed material 15 (for example, a band-shaped foamed material such as a foamed polyethylene sheet or a foamed epoxy sheet) that foams when heated. The material 16 (for example, an uncured epoxy sheet) is laminated in advance. In this reinforcing material 14, the resin material 16 and the foamed material 15 are simultaneously heat-treated so that the foamed material 15 is foamed before the resin material 16 is thermally hardened. It is necessary to form the resin material 16 and the foam material 15 into sheets in advance and then attach them together. Furthermore, in order to form the sheet-like resin material 16 and the foam material 15, the materials must be processed to produce a secondary product, which is necessary. The time and effort will increase, and as a result, reinforcing material 1
Reinforcement material 14 requires numerous manufacturing steps to form reinforcement material 14.
The manufacturing cost will also increase accordingly. Therefore, a measure has been desired to more easily and inexpensively reinforce the plate material 2a. This invention was made by focusing on the above points, and is made of a foam material that has flexibility for use as a carrier and is molded to approximately the same shape as the ribs necessary for reinforcing the plate material. After curing, the reinforcing material is impregnated with an adhesive having a predetermined strength, and this reinforcing material is attached to the parts of the board that require reinforcement and cured to integrally form reinforcing ribs on the board. The purpose is to resolve the points mentioned above. Hereinafter, a method for reinforcing a plate material according to the present invention will be explained based on FIGS. 4 and 5. First, in this invention, a reinforcing material 21 is formed to reinforce the plate material 20. Specifically, the reinforcing material 21 is made by impregnating a foamed material 22 for a carrier with an adhesive 23. Various materials such as foamed urethane, foamed vinyl chloride, and foamed polyethylene can be used as the foamed material 22, but the plate material 20
In order to expect conformability to the shape of the area that requires reinforcement, it is preferable to use a flexible material, and a porous material having a large number of continuous small chambers 24 so as to be sufficiently impregnated with the adhesive 23. That is, open-cell foams are preferred. Preferably, a polyether-based flexible urethane foam sheet having a specific gravity of 0.022 can be used. The foamed material 22 is adjusted in advance to have a height H, a width W, and a length L that are appropriately sized to match the portion of the plate material 20 that requires reinforcement. Although the illustrated example shows the foamed material 22 having a square cross-section, the present invention is not limited to this, and it is also possible to use a material having a semi-cylindrical shape, a triangular shape, or other cross-sectional shapes. The adhesive 23 is selected depending on the material of the foamed material 21 and can be sufficiently impregnated into the foamed material 21 for the carrier. For example, adhesive made of one-component epoxy resin, adhesive made of two-component epoxy resin, etc. Alternatively, polyester resin or the like can be used. This adhesive 23 is curable at room temperature and sufficiently has adhesion and curability as will be described later. Furthermore, the adhesive 23 is not necessarily of one type;
An adhesive that has good adhesion to the plate material and an adhesive that can obtain sufficient strength after curing may be made into two layers in the foam material 21 to exhibit the characteristics of each adhesive. Next, in this invention, a reinforcing material 21 in which a foamed material 22 for a carrier is impregnated with an adhesive 23 is adhered and hardened to a portion of the plate material 20 that requires reinforcement, and reinforcing ribs 25 are integrally formed on this plate material 20. It is to be formed. Therefore, the adhesive 23 is applied to at least the foam material 21.
It has adhesion, adhesion, and adhesion properties that allow it to be reliably attached to the board material 20, and even if the part of the board material 20 that requires reinforcement is a vertical part, or the back side or bottom side of a horizontal part. It has the property of being able to reliably adhere and maintain that state even if it is a part that is likely to peel off due to contact with the adhesive.
It is necessary that the material has properties that can impart desired hardness to the material. By impregnating the adhesive 23 in this manner, the plate-compatible surface 26 of the reinforcing material 21, specifically the foamed material 22, has sufficient adhesion, adhesion, and adhesion.
Adhesive properties are provided, and this property is utilized to adhere the reinforcing material 21 to the portion of the plate material 20 that requires reinforcement. In the illustrated example, the reinforcing material 21 is attached to the plate material 20 in the vertical direction, but the reinforcing material 21 is not limited to this example, and of course may be attached in the horizontal or diagonal direction. At the time of pasting, if the plate material 20 is a car door outer panel, a highly rigid part is placed near the part that requires reinforcement, for example, the part where the accent line is formed and the upper part of the door outer panel are pasted. If it is made to wear, a more advantageous reinforcing effect can be expected. After the reinforcing material 21 is attached to the plate 20, the reinforcing material 21 is hardened at room temperature or by heat treatment. When an automobile door outer panel is selected as the plate material 20, the heat of the drying oven during the car body painting process is used to heat and harden the adhesive 23, harden the entire reinforcing material 21, and apply the reinforcing ribs 25 onto the plate material. Integration etc. can also be performed. Next, examples will be shown. Example 1 As the foam material 22, height H = 10 mm, width W = 50 mm,
A piece of soft urethane foam with a length L = 200 mm and a specific gravity of 0.022 was selected, and this soft urethane foam was impregnated with 40 g of a two-component epoxy resin adhesive 23 to form a reinforcing material 21. This reinforcing material 21 was made into a material with a width of 55 mm and a length of 200 mm. ,thickness
It is pasted on a thin steel plate of 0.7 mmt, heat-treated to harden the adhesive 23, and a reinforcing rib 25 of height H=10 mm, width W=50 mm, and length L=200 mm is integrally formed on the thin steel plate. (Test piece 1). A thin steel plate similar to the above without forming the reinforcing rib 25 and the reinforcing rib 25
As a result of examining the strength of the thin steel plate formed with the reinforcing ribs, it was found that the strength of the thin steel plate formed with reinforcing ribs was significantly improved as shown below.

[Table] Example 2 A piece of soft urethane foam (product name: Slot Foam, manufactured by Bridgestone Tire Co., Ltd.) with a bulk specific gravity of approximately 0.01 was cut into a length of 180 mm, width of 50 mm, and thickness of 10 mm. 150HR)
It was impregnated with 60 g of an unsaturated polyester resin composition prepared by mixing 100 parts by weight of methyl ethyl ketone peroxide and 1 part by weight of cobalt naphthenate. Urethane foam impregnated with this unsaturated polyester resin composition was attached to the center of a 0.7 mm thick steel plate (200 mm x 80 mm) used for the outer panel of an automobile door.
Next, the unsaturated polyester resin was heated at 140° C. for 30 minutes to cure the unsaturated polyester resin and form reinforcing ribs to prepare a test piece 2. This test piece 2 was placed with the foamed urethane side facing down.
It was placed on a support stand provided with a gap of 100 mm, and the center was pressed downward from the top at a bending speed of 5 mm/min. A steel plate to which urethane foam was not attached was also tested in the same manner. The results are shown in the table.

[Table] As explained above, according to this invention,
A reinforcing material is created by impregnating a flexible foam material for use as a carrier and molded to approximately the same shape as the ribs required for reinforcing the board with an adhesive that is sticky at room temperature and has a specified strength after hardening. Toshiko's reinforcing material is attached to the parts of the board that require reinforcement and cured to form reinforcing ribs integrally on the board. There is no need to pre-form a reinforcing material in which these are laminated and attached, and reinforcing ribs that are integrated with the plate material can be easily and reliably formed.
The time and effort required to form the uncured sheet-like resin material and the unfoamed sheet-like foam material can be reduced, and manufacturing costs can be reduced accordingly. In addition, by selecting a flexible material as the foam material, it is possible to increase the ability to follow the surface shape of the portion of the plate material that requires reinforcement, and it is also possible to improve workability during pasting. Furthermore, when the outer panel of a car door is selected as the plate material, the adhesive used is a resin that hardens at room temperature, so the plate material can be reinforced using the outfitting line, so a special process for this reinforcing method is created on the line. Another advantage is that it can be easily incorporated into existing processes without any problems.

[Brief explanation of drawings]

1A is a front explanatory view of a conventional door; FIG. Figure A is a perspective explanatory view of the main parts of the door outer panel that has already been proposed as a solution to the problem of the conventional example, Figure 3 is a sectional view taken along the - line in Figure 2 A, and Figure 3 is before reaching Figure 2 B. FIG. 4 is a perspective view of a reinforcing material used in the present invention, and FIG. 5 is a perspective explanatory view showing a reinforcing state of a plate material as an embodiment of the present invention. 2... Door outer panel, 2a... Metal plate material, 3, 10... Reinforced material, 4, 16... Resin material, 11... Resin part, 12... Foaming part, 13, 2
5... Reinforcement rib, 14, 21... Reinforcement material, 15,
22... Foaming material, 20... Board material, 23... Adhesive.

Claims (1)

[Claims] 1 A flexible foam material for use as a carrier and molded to approximately the same shape as the ribs required for reinforcing the board is impregnated with an adhesive that is sticky at room temperature and has a specified strength after hardening. A method for reinforcing a plate material, the method comprising: forming reinforcing ribs integrally on the plate material by adhering and curing the reinforcing material to areas of the plate material that require reinforcement.