Showing papers by "Alan N Bramley published in 1992"
TL;DR: In this paper, two cold extrusion processes, radial extrusion using a circular punch and backward extrusion with the punch of square cross section, are investigated; experiments have been conducted in order to determine the basic process parameters.
19 citations
01 Jan 1992
TL;DR: A general computerised methodology is proposed for small batch manufacture using a programmable press in conjunction with a workpiece manipulator, thus enabling the load and metal flow to be predicted for open die forging of rectangular sections locally deformed between two flat dies.
Abstract: Open die forging is a long established process which can be used to produce a wide range of shapes. Its characteristic features in relationship to closed die forging processes are that it requires low forming loads, and with a small range of simple tools a wide variety of shapes can be produced. Deforming the workpiece is essentially incremental and manual skill and experience in manipulating the workpiece between the tools plays an important part in producing the required profiled product. This however has resulted in a diminished utilisition of the process. In this paper a general computerised methodology is proposed for small batch manufacture using a programmable press in conjunction with a workpiece manipulator. Elementary analysis, based on the upper bound method, with a simple kinematically admissible velocity field is introduced for restricted block forming, thus enabling the load and metal flow to be predicted for open die forging of rectangular sections locally deformed between two flat dies.
TL;DR: In this paper, an experimental evaluation of strain distributions within a moderately complex axisymmetric forged compoment, using an established microstructural evaluation technique, was performed to validate the simulated forging and strain distribution obtained by UBET, for the same component.