Impression Die Forging

Compression of workpart by dies with inverse of desired part shape
Flash is formed by metal that flows beyond die cavity into small gap between die plates
Flash must be later trimmed, but it serves an important function during compression:
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As flash forms, friction resists continued metal flow into gap,constraining metal to fill die cavity

Impression‑Die Forging Practice

•Several forming steps are often required
-With separate die cavities for each step
•Beginning steps redistribute metal for more uniform deformation and desired metallurgical structure in subsequent steps
•Final steps bring the part to final geometry