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​Disassembly is one of the key elements of any processing of recovered products. Be it for repair, remanufacturing, refurbishing, cannibalisation, material recycling, or disposal. Hence, planning the disassembly is important and—with growing amounts of recovered products and need for saving resources—becomes even more important. The disassembly planning approaches presented are based on mathematical programming. With this methodology, a profit-optimal planning of quantities of multiple types of recovered products as well as parts distribution, material recycling, and disposal quantities is realised. Thereby,typical aspects, like material purity requirements, the condition of the recovered products, hazardous parts, and capacity limitations, are also considered. A new approach is the presented combination of disassembly-to-order planning and disassembly sequencing, which is called Flexible Disassembly Planning.



Chapter 1. Introduction

The product recovery and thus the disassembly process become more and more important these days. The motivation for product recovery is manifold. Typical motives are legal restrictions or environmental guidelines. Examples are the Waste Electrical and Electronic Equipment (WEEE) Directive for electrical and electronic products and the End-of-Life Vehicles Directive. Furthermore, there is also the fact of the environmentally friendly image.

Christian Ullerich

Chapter 2. Fundamentals

The disassembly planning belongs to the field of environmentally conscious manufacturing and product recovery. This already indicates that the manufacturing seems to play a role or the disassembly has influence on the manufacturing, or both. This is a little bit surprising, but the steps before the manufacturing, e.g., the design of a product, have a major influence on the complete life cycle, which includes manufacturing and disassembling.

Christian Ullerich

Chapter 3. Complete disassembly planning

Next to Kongar/Gupta, the considerations are also motivated by the local city cleaning company SR-Dresden in Dresden, Germany. This company takes back the cores from collection points and disassembles the cores for material recycling. The material recycling is conducted by other companies. The disassembly company does not decompose the cores totally. For example, only certain capacitors are removed from circuit boards, because of the hazardous material they consist of.

Christian Ullerich

Chapter 4. Flexible disassembly planning

This chapter introduces the considerations of disassembly depth into the planning aspects of the previous chapter. This means that not only the availability and condition of cores, the demand of items and material, and the other considered constraints need to be incorporated. With this extension that we will focus on in the following, an explicit demand of different mutual exclusive modules is considered, too. Hence, aspects of multiplicity and commonality across cores not only apply to items, but also to modules.

Christian Ullerich

Chapter 5. Résumé

This work considers several aspects of the disassembly planning. The complete disassembly planning problem is the first aspect. It is the basis for all further extensions that are considered in this work. The planning aims at determining the optimal quantities of cores to acquire, items to distribute, material to recycle, and waste to dispose of in order to gain the maximal profit. Thereby, the profit calculation includes revenues of item distribution and material recycling. On the other hand, the cost covers acquisition, disassembly, and disposal cost.

Christian Ullerich


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