Slide 1
Forging presses solid metal into a new shape
Forging shapes metal through compressive forces, often between tools or dies. It causes plastic deformation: a permanent change of shape while the metal remains solid.
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Open-die and closed-die processes constrain that flow differently. The choice affects achievable geometry, tooling cost and the amount of later machining needed for critical surfaces.
Slide 2
Hot and cold forging have different force demands
Hot forging makes many metals easier to deform. Cold forging can offer dimensional and surface advantages but usually requires higher forces.
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Working temperature also affects oxidation and microstructure. Selecting a temperature is therefore a balance among formability, tool life and the properties desired after the process.
Slide 3
The internal structure can align with service loads
Deformation changes the orientation of the material’s internal structure. Suitable grain flow can align with important service loads.
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This benefit is directional rather than universal. Cutting across flow during later machining or loading a part in an unfavourable direction can reduce the advantage expected from the forging route.
Slide 4
Forging can also introduce folds and cracks
Forging can improve some internal features but can also create laps, folds or cracks. Tool design and material preparation influence the outcome.
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Incomplete die filling leaves the wrong shape, while excessive local deformation can damage the material. Process control must therefore consider how strain is distributed, not just the final outside dimensions.
Slide 5
Later treatment and finishing help set performance
Heat treatment, trimming and machining often follow forging. The finished part’s performance comes from the combined process history.
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A forged blank is not automatically superior to every casting or machined part. Alloy, geometry, loading and verified quality determine which route is appropriate for the actual component.
Sources
- Forging Grain Flow Explained
VINIR Engineering
- Heat Treatment Services
TWI