A process sequence analysis of the piston-pin production method

초록

<p align="justify">Several cold extrusion processes to produce an axisymmetric steel piston-pin are investigated for comparing each other. Two methods among four conventional ones are selected to be simulated using the rigid-plastic finite element method. One of the both methods using a mechanical press has one stage process and the other utilizing a cold header applies a multi-stage process to produce a final product. FEM analysis is performed mainly for strain distribution and load-stroke relationships. Based on the results of preliminary simulation, both process sequence are proved to have proper characteristics suitable for each production method in terms of maximum load. But the multi-stage production method is shown to have bad alignment because the maximum load between each steps is not distributed evenly. Since the main process is a backward extrusion for all processes, the design criteria such as the backward extrusion ratio and punch diameter to depth ratio are considered.<p align="justify">