Precision forging is defined as a flashless forging operation which generates high quality parts concerning the surface quality and accuracy of dimensions. The present level of development allows the industrial production of axis symmetric parts like gear wheels and steering pinions by a precision forging process. Further development of flashless forging operations is necessary for realising multi-stage precision forging processes for flat long pieces. The ability to forge high-duty automotive components like crankshafts or connecting rods is expected to be a major improvement, because these components feature an extremely asymmetric mass distribution and a big specific mass. To solve the appearing technological deviances a new forging chain with three forging operations was developed. Practical testing of the process chain showed the principle feasibility of forging crankshafts with the flashless precision forging technology. The presented precision forging technologies for a crankshaft consist of multistage processes including preforming operations and a final forging. Preforming steps are carried out in closed dies and with a partly open tool system. The principle of the tool concept for the final forming is the separation of the closing of the dies and the movable punches penetrating the forging. The developed technology for the precision forging of an elementary cell is transferable to a whole crankshaft.
Tooling systems and peripheral equipment for the precision forging of flat long pieces with preform operations
Toolingsysteme und peripherische Ausrüstung für das Präzisionsschmieden von flachen langen Stücken mit Vorformbehandlung
2005
7 Seiten, 13 Bilder, 6 Quellen
Aufsatz (Konferenz)
Englisch
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