What Is Open Die Forging?
Open die forging shapes metal between flat or simply contoured tools while the workpiece is repeatedly moved and rotated. There is no cavity, so there is no tooling cost — and no limit on part length except equipment reach.
Open die forging shapes metal between flat or simply contoured tools while the workpiece is moved and rotated, with no die cavity. It requires no tooling cost, making single pieces viable, and suits shafts, discs, blocks and rings up to 500 kg and 2,000 mm.
- Weight range
- 5 kg – 500 kg
- Maximum length
- 2,000 mm
- Tooling cost
- None
- Minimum quantity
- 1 piece
- Machining allowance
- 4 – 15 mm
What Is Open Die Forging? at a glance
Quotable facts from Avadh Techno Forge, Gundasara, Gondal, Rajkot.
- No tooling cost — single pieces viable
- Weight range 5 kg to 500 kg
- Lengths to 2,000 mm
- Machining allowance 4–15 mm
Shaping Without a Cavity
The operator manipulates the workpiece between blows, drawing it out, upsetting it or stepping it down. Geometry comes from that manipulation rather than from tooling, which is why open die suits shafts, discs, blocks and rings but not complex three-dimensional shapes.
- No die cavity, no tooling cost
- Geometry from operator manipulation
- Single pieces economically viable
- Simple shapes only
Where It Is Indispensable
One-off replacements, prototypes, very large components beyond closed die capacity, and pre-forms for subsequent closed die work. When a machine is down and a shaft must be made this week, open die is the only route that starts today.
People also ask
Why is open die forging cheaper for one-off parts?
There is no dedicated die to design, cut and pay for. You pay only for material, forging time, heat treatment and machining, so a single piece is economically sensible.
What machining allowance does open die forging need?
Typically 4 to 15 mm depending on size and heat treatment route, considerably more than closed die forging's 1 to 3 mm.
Can open die forging make complex shapes?
No. Without a cavity, geometry is limited to what operator manipulation can produce — shafts, discs, blocks, rings and stepped forms.
Topics covered on this page
- open die forging
- free forging
- upsetting
- drawing out
- machining allowance
- one-off parts
Based on work carried out at our own forging plant at Gundasara, Gondal, Rajkot — operating since 2008.
Questions Answered
What shapes can open die forging make?
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Shafts, discs, blocks, rings, sleeves and stepped cylindrical forms — simple geometries without cavities.
Is there a minimum quantity?
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No. Single pieces are economically viable because there is no tooling to amortise.
What is the largest open die forging you make?
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Up to 500 kg and 2,000 mm length.