Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1995-09-20
1998-05-12
Stemmer, Daniel
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156216, 156295, 29458, B23P 2500, B32G 3100
Patent
active
057499926
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process for producing an adhesive bond in a folded joint between an inner component and an outer component, preferably of sheet metal. The inner component has an essentially flat edge area and the outer component has an essentially flat edge area with a bent-up edge flange for bending about the edge area of the inner component. The process includes the application of an adhesive string along the surface of the edge area of the one component which is intended to lie in contact with the edge area of the other component.
Folded joints are often used to join an inner component to an outer component of e.g. a hood, a door or the like in a motor vehicle. The inner component and the outer component are designed to be joined to each other by bending the edge flange of the outer component about the edge of the inner component. It is, however, difficult to make such a folded joint stable without some other bond between the components. In folded joints for motor vehicle body parts and the like an adhesive bond is often made between the inner component and the outer component. This adhesive bond has in addition to its bonding function a corrosion protection function, both in the folded joint itself and at the free edges of the inner component and the outer component.
In a previously known process for achieving an adhesive bond in a folded joint between an inner component and an outer component, a string of adhesive, usually cold epoxy adhesive, is applied to the surface of the edge area of the outer component, which surface is to be in contact with the edge area of the inner component. The outer component and the inner component are then placed together and the folding of the joint is completed. The adhesive string is laid out and pressed around the edge of the inner component, so that the edge is protected. It is, however, not possible to make the adhesive cover the entire folded-over edge flange. In order to protect the folded joint and particularly the edges of the flanges, a folded joint seal is applied, usually of a PVC-material, over the edge of the folded-over edge flange. The material also adheres to the edge area of the inner component. This gives rise, however, to an air gap enclosed in the folded joint. In the subsequent processing of the part, e.g. curing of paint or other surface treatment, the air in the enclosed space will expand and give rise to blisters and pores in the sealing material. This is very difficult to detect and the blisters and pores will make it possible for moisture to penetrate into the folded joint, thus decreasing the resistance to corrosion.
The purpose of the present invention is to provide a process which avoids the difficulties described above and achieves a completely satisfactory adhesive bond in a folded joint between an inner component and an outer component.
The invention will be described in more detail below with reference to the accompanying drawing, where
FIG. 1 is a schematic view of two components which are designed to be joined by a folded joint and an adhesive bond in accordance with the invention,
FIG. 2 is a schematic view of the components of FIG. 1 after a first joining step,
FIG. 3 is a schematic view of the components of FIGS. 1 and 2 after completed joining,
FIG. 4 is a schematic side view which shows a suitable placement of a nozzle for applying a string of adhesive in accordance with the invention,
FIG. 5 is a schematic end view of the nozzle of FIG. 4.
FIGS. 1-3 show a first component 1 and a second component 2, which are designed to be joined by a folded joint, with an adhesive bond according to the invention provided between the first component 1 and the second component 2.
The first component 1 has an edge area 3, which is essentially flat and is designed to be applied against an edge area 4, also essentially flat, of the second component 2. The second component 2 also has a bent up edge flange 5, which is designed to be bent in over the flat edge area 3 of the first component to achieve a folded joint between the first compone
REFERENCES:
patent: 4719689 (1988-01-01), Yamamoto
patent: 5084119 (1992-01-01), Barksdale
patent: 5470416 (1995-11-01), Herring
Eklund Karl-Gunnar
Mattsson Tommy
AB Volvo
Stemmer Daniel
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