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Introduction
The value of fine grids, electromarked (1) on to metal sheets
before pressing, so that the type and magnitude of the strain developed
in the critical region of the pressing can be assessed, is undisputed.
Keeler (2), Meyer and Newby (3), and Goodwin (4), have all discussed
practical applications of this technique and Palmer (5) has reviewed
the field and introduced the concept of a relative safety factor (MSF).
However it may be useful to see what this 'mark' consists of, how the
marking affects the subsequent metal performance, what the limitations
of the process are and other peripherical issues. It is these aspects
of the process which is the concern of this paper. |
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