Method and Apparatus for Reducing Adhesive Curing Induced Distortion
Publication Date: 2017-May-24
The IP.com Prior Art Database
Title: Method and Apparatus for Reducing Adhesive Curing Induced Distortion
Brief Description of the Drawing: Figure 1 is a schematic side view of a method of bonding and fastening together of two
dissimilar metals as described in this disclosure. Please note that the dimensions, materials, and components shown on the illustration are exemplary, and this disclosure is not limited to any specific dimension, material, or component and that variations are possible without departing from the scope of the disclosure as described below.
Description: As shown in the attached illustrations and described below, a method of adhesively bonding and
fastening two dissimilar metals such that there is a reduction in subsequent distortion, is disclosed.
The assembly consists of an aluminum to steel hybrid joint with heat cured epoxy adhesive and a fastener, such as a Magna‐Lok fastener as shown. Adhesive is cured after the fasteners are installed. Since the aluminum and steel have different coefficients of thermal expansion, the adhesive curing at high temperature may cause distortions in the hybrid joint. To reduce distortion in joint, the fastener should be installed from the direction to first enter the metal with a higher thickness and higher coefficient of thermal expansion, as the fastener installation direction may affect the adhesive layer, particularly its thickness, in a manner that reduces the distortion.
Background: The following references and brief descriptions are included with regard to their disclosed
methods to reduce distortion in adhesive‐mechanical hybrid joints: US 2008‐0149256 A1, Application Number 11/960,902, Method and apparatus to minimize
adhesive induced distortion. A method to minimize adhesive induced distortion between heat cured adhesively bonded sheet materials includes applying a layer of heat curable adhesive between the two
sheets; installing a self‐piercing rivet or clinching the sheets to connect the sheets; and heating the sheets to cure the adhesive so that the adhesive and the rivet or clinching connection counterbalance the stresses tending to distort the sheets.
Weber (“A New Look at an Old Technology”, Austin Weber) discloses a process in which dissimilar substrates are bonded with an adhesive and a self‐piercing rivet. Heat is used to perform the curing. Weber may be read to disclose that any well known relationship between the materials, including the orientation of the dissimilar materials when they are joined and the direction of the mechanical fastener, would be suitable...