ME 477 Lecture Notes - Lecture 4: Forming Limit Diagram, Mechanical Watch, Formability
Document Summary
Due: 4:10pm nov 1st: describe (a) the similarities and (b) the differences between the bulk-deformation processes and the sheet-metal forming processes. The area to volume ratio for bulk deformation processes is low compared to sheet metal processes. The presence of a burr enlarges this contact area, causing the component to be better supported: describe the differences between compound, progressive, and transfer dies. In compound dies, several different cuts or shapes are designed into one die, such that the punch progresses into one hole, with the next shape replacing the previous. This process is slow and expensive because the tooling involved can become complicated and expensive even for relatively simple part designs. Progressive dies rely on a station process, where a different die is present at each station to perform a specific operation on the metal as it passes. All the dies are fired simultaneously to punch the metal into the shape of each die at each station.
