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Lesson 08·Running Forge Dies

Reading wear: crazing, washout, abrasion, adhesive pickup, plastic deformation

Five wear modes, one visual signature each, and the rules that keep heat check from getting called mechanical fatigue and washout from getting called plastic deformation.

9 min readLesson 8 of 13

A die pulled at 60K hits lands on the bench. Five people look at it. The operator says "heat checked, normal." The die-setter says "washed out at the flash land." The maintenance tech says "galled at the corner." The tooling engineer says "plastic deformation on the boss." The quality engineer says "we need to scrap it." All five are looking at the same die, all five are partly right, and none of them have a shared vocabulary for what they are seeing. The pull-now decision waits until someone produces a microsection three days later. By then the next die in the same job has the same problem and nobody noticed because nobody knew what to look for.

This lesson is the shared vocabulary. Five wear modes, one visual signature each, and the rules that keep them from being called wrong on the bench.