Document Type


Date of Award

Spring 5-31-1998

Degree Name

Master of Science in Manufacturing Systems Engineering - (M.S.)


Industrial and Manufacturing Engineering

First Advisor

Sanchoy K. Das

Second Advisor

R. S. Sodhi

Third Advisor

Zhiming Ji

Fourth Advisor

Layek Abdel-Malek


As the society progresses towards ecological maturity, the issue of reducing the environmental burden imposed by used products becomes increasingly important Environmental issues are becoming increasingly relevant for product designers and manufacturers. Public awareness of the value and fragility of an intact ecology is constantly growing, and the traditional assumption that the cost of ecological burdens to be shared by a society, as a whole is no longer accepted. Environmental protection legislation requiring manufacturers to "take back" and recycle used products will be a commonplace throughout Europe and the U.S. in the near future.

Demanufacturing involves separating and disassembling a 'product' into its smaller 'subassemblies' and 'components'. Unfastening carries out the physical separation itself and other separation techniques are also used to separate the unfastened component. There are two types of Disassembly methods they are destructive disassembly and non-destructive. The term 'product' means a complete entity, such as an automobile, a washing machine, etc. 'Sub-assembly' refers to a product .A 'component' is a subassembly that cannot be disassembled any further.

The principle aims and objectives of this research are to analyze the mechanical aspects of demanufacturing a component with respect to fasteners and disassembly Processes. This research involved developing Disassembly Effort Index Metrics (DEIM) for a wide variety of industrial fasteners, destructive and non destructive disassembly processes.

The industrial Fasteners were separated into four categories i.e. One Piece Fasteners, Two Piece Fasteners, Integral Fasteners and Miscellaneous Fasteners. They were analyzed with respect to the accessibility of a fastener with respect to the part, tools necessary to disassemble them, time needed to unfasten them, part hold and fixturing issues ,forces needed to unfasten them and instructions to the dissemblers to dissemble the fastener. A scoring pattern was developed.

The Disassembly Processes were categorized into Non-Destructive Disassembly and Destructive Disassembly. The Non-Destructive Disassembly methods like Magnetic Separation, Suction and Drainage, Self Removal, Separation of both Fastened and Unfastened Components, and only two of the Destructive Disassembly methods i.e. Weld Breakage and Impact breakage were analyzed using Disassembly Effort Index Metrics (DEIM) parameters. The DEIM parameters, for the Disassembly Processes are, time needed to disassemble the component, tools needed to separate them, Forces (both human and Machine), Part hold , Process Instructions and Hazard Tools. The scoring pattern was developed.

Included in

Manufacturing Commons



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