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Title: Factors influencing the final shape of formed components
Author: Mehmi, B. R.
Awarding Body: University of Wales Swansea
Current Institution: Swansea University
Date of Award: 2003
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To meet all of the many automobile manufacturing requirements, including tougher safety standards, strict environmental regulations, and energy conservation measures, car manufacturers have produced lighter automobiles through new materials and new processes. Gauge reduction of auto body panels makes a contribution not only to saving costs, but also to saving fuel through car weight reduction. The supply of natural fuel is ever-depleting, and so gauge reduction is one of the most important research areas for auto body production. However, gauge reduction of panels could be directly connected with the demerits in panel surface quality, such as surface stiffness, dent-resistance and the increase of elastic recovery. The pressforming of automotive outer panels is much more of a stretching process, where the material that is considered for the outer body is stretched and formed over the punch and into the die cavity. The area of the blank that is to be used for the outer panel does not have to flow over any tool radii. The problem of elastic recovery here can be overcome relatively easily, by over sizing the punch or equivalent geometry. In the forming of channel sections where the material has to flow over the tool radii, complex residual stress is induced through the thickness of the material. These result in a material shape distortion (side-wall curl) that is much more difficult to control and predict, than the shape distortion produced from simple bending (springback). This has led to increased throughput time and production costs.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (D.Eng.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available