| 講演要旨： |
This talk discusses our attempts towards design for product-embedded disassembly, a new approach to Design for Disassembly that aims at designing products with built-in disassembly means to be activated at the end of product life cycle. The talk consists of two parts: 1) the design of a new class of joints that can be detached by the application of localized heat, and 2) the design of assemblies that can disintegrate via a domino-like process triggered by the removal of one or few fasteners.
The first half of the talk presents a method for designing a new class of joints, heat-reversible snaps, which allow easy, non-destructive, and clean detaching between internal frames and external panels in automotive bodies. While the assembly process is analogous to normal locator-snap systems, the heat-reversible snaps can be unlocked non-destructively upon heating the panel at a certain location, via the non-uniform thermal deformation of the panel. The optimum number and locations of the locators on the given panel are found based on the equivalent springs that represent the stiffness of the locator. Then, the locations of snaps and heating that ensure unlocking upon heating of the minimum area on the panel are obtained.
The second half of the talk presents a method for designing assemblies, where the relative motions of components are constrained by the locators (tabs, slots, lips, rests, etc) integral to the components, in such a way that the removal of one or few fasteners would cause the self-disintegration of the assembly in a unique sequence, much like the domino effect. Given component revenues and components to be retrieved, the method simultaneously determines the spatial configurations of components and locator features on the components, such that the product can be disassembled in the most profitable sequence.
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