Closed Die Forging
Closed die forging — also called impression die forging — squeezes heated steel between two dies that carry the exact shape of the finished part. The metal flows to fill every cavity, producing a component with continuous grain flow, near-net shape and mechanical strength no casting or bar-stock machining can match.
- Component Weight
- 0.2 kg – 75 kg
- Forging Temperature
- 1150 – 1250 °C
- Dimensional Tolerance
- IS 3469 / DIN 7526 Class E–F
- Materials
- EN8, EN19, EN24, SAE 1045, 20MnCr5, SS 304/316
- Batch Size
- 500 – 50,000 pcs
- First Article Lead Time
- 3 – 5 weeks including die
Closed Die Forging at a glance
Quotable facts from Avadh Techno Forge, Gundasara, Gondal, Rajkot.
- Component Weight: 0.2 kg – 75 kg
- Forging Temperature: 1150 – 1250 °C
- Dimensional Tolerance: IS 3469 / DIN 7526 Class E–F
- Materials: EN8, EN19, EN24, SAE 1045, 20MnCr5, SS 304/316
- Batch Size: 500 – 50,000 pcs
- First Article Lead Time: 3 – 5 weeks including die
How Our Closed Die Forging Line Works
Sheared billets are induction heated to 1150–1250°C, descaled, then struck on friction screw presses and pneumatic hammers in two to four blows. Flash is trimmed hot on dedicated trimming presses, and the part moves straight to controlled cooling so grain structure and hardness stay uniform across the batch.
- Billet shearing with ±1 mm length control
- Induction heating with pyrometer logging
- Multi-stage blocker and finisher impressions
- Hot trimming and coining in-line
Why Closed Die Forging Beats Casting and Machining
Because grain flow follows the contour of the part instead of being cut through, closed die forgings deliver 20–40% higher fatigue life than machined bar stock and carry none of the porosity, shrinkage cavities or inclusions that limit castings in safety-critical duty. Material usage also improves, since near-net shape leaves only a light machining envelope.
- No porosity or shrinkage defects
- Directional grain flow along load paths
- Repeatable weight within ±2%
- Lower machining time and scrap
Component Sizes and Volumes We Handle
The line is built for medium and high volume work — from 500-piece development batches to 50,000-piece annual schedules. Typical parts weigh 0.2 kg to 75 kg with envelopes up to 600 mm. Dedicated dies are designed, cut and proven in-house, so a new part moves from drawing to first article samples in three to five weeks.
People also ask
How many pieces does a closed die forging die last?
Typically 20,000 to 60,000 pieces on medium components before the impression is re-sunk, depending on part size, material and forging temperature.
What is the difference between closed die and open die forging?
Closed die traps metal in a shaped cavity, giving repeatable near-net parts but requiring a die. Open die shapes metal between simple tools with no tooling cost, suiting single pieces and simple geometry.
Can closed die forging produce hollow parts?
Not internal cavities. A through hole can be pierced, but enclosed internal passages require casting or fabrication.
Topics covered on this page
- closed die forging manufacturer India
- impression die forging Rajkot
- closed die forging company Gujarat
- hot closed die forged parts
- closed die forging supplier
Based on work carried out at our own forging plant at Gundasara, Gondal, Rajkot — operating since 2008.
Questions Answered
What is the minimum order quantity for closed die forging?
+
For a new dedicated die we normally recommend a first batch of 500 pieces so the die cost is spread sensibly. Repeat orders can be released in smaller lots against a yearly schedule.
Do you make the forging dies in-house?
+
Yes. Die design, CAM programming and die sinking are done in our own tool room, which is why sample lead time stays at three to five weeks and die corrections take days rather than weeks.
Which steel grades can you forge?
+
Carbon steels such as SAE 1045 and EN8, alloy steels including EN19, EN24, 20MnCr5 and 42CrMo4, plus stainless grades SS 304, SS 316 and SS 410. Customer-specified grades are sourced against mill test certificates.
Can you supply closed die forgings fully machined?
+
Yes. Our CNC turning and VMC sections finish forgings to drawing so you receive a ready-to-assemble component with dimensional and material reports in one delivery.