Closed-Die (Impression-Die) Forging Specialists
Closed-die forging — also called impression-die or drop forging — is the process Shivam Forge has built its factory around. Stronger parts than casting, tighter tolerances than open-die, less machining than bar stock. From 50 g to 50 kg per piece. Tooling designed and made in-house at our Shapar, Rajkot plant. Call +91-9265772827 to discuss your component.
When a stub axle, steering knuckle, or connecting rod fails, vehicles crash. When a drill collar thread strips in a wellbore, you lose the string. These are the components where closed-die forging earns its premium over casting or machined bar. The impression dies force the steel to flow in a controlled direction, creating a continuous grain structure aligned to the stress path of the final component. The result is measurably better fatigue life, better impact resistance, and no porosity — defects that can hide inside castings and only reveal themselves after years of field use. Our press shop runs 250T to 1000T forging hammers and presses, and every die set is designed and made in our own tool room.
Steering and suspension components are the primary application for closed-die forging. The grain flow produced in a closed die follows the shape of the stub axle or knuckle, giving fatigue strength that cast or machined equivalents cannot match.
Gearbox components need consistent grain structure and tight dimensional control to machine cleanly. Closed-die forged gear blanks, input shafts, and universal joint yokes give the machining shop a predictable starting point.
Tractors and implements take heavy, variable loads across millions of cycles. Hub carriers, PTO flanges, and spindle forgings in closed dies — from EN8 to EN24 depending on load requirement — are a core product from our Rajkot plant.
High-pressure valve bodies and flanges in 4140, 316SS, or Duplex steel produced in closed dies give uniform wall thickness and sound material free from casting porosity. We produce to ASTM A182, API 6A, and customer drawings.
Cylinder end caps, piston rod eyes, clevis ends, and manifold blocks in closed dies for hydraulic systems operating at 200–700 bar. Forged parts have higher burst pressure capability than equivalent cast or welded assemblies.
Ground support equipment, vehicle structural brackets, and tooling components where aerospace-grade material quality and full traceability are required. We produce with 100% MT/UT inspection and FAIR documentation on request.
Our tool room engineers design closed dies using CAD with forging simulation to predict metal flow, identify die fill problems, and optimise flash line position before any steel is cut. Dies are manufactured in-house on CNC machining centres.
Billets are cut to precise weight on bandsaw to ensure consistent flash volume and die fill. Induction or gas-fired heating to 1100–1250°C depending on grade, with temperature verified before the billet enters the die.
The billet is placed in the lower die and struck with the upper die — one to five blows depending on component complexity. Flash is controlled by die land design, and trimming removes it cleanly in the same heat.
Flash trimming, shot blast cleaning to Sa 2.5, and normalising or annealing (depending on grade) follow immediately. These steps set the material condition for subsequent heat treatment or machining.
We offer CNC turning, milling, drilling, and thread cutting on all forged components. From a rough forging to a completely machined part ready for assembly — managing the full sequence under one roof is our standard offer.
Automotive and oil & gas customers receive PPAP packages at the agreed submission level. CMM inspection for dimensional compliance, 100% magnetic particle testing (MT) or ultrasonic testing (UT) for safety-critical parts.
The forging process aligns the steel's grain structure along the part geometry. This directional grain flow gives closed-die forgings 25–40% higher fatigue strength than equivalent castings in typical engineering applications.
Cast components can contain gas porosity, shrinkage voids, and inclusions that are invisible in routine inspection and only reveal themselves as failures in service. Forgings are dense and homogeneous — no internal voids.
Closed dies control the outer geometry of the part, giving forging tolerances of ±0.5–1 mm on most dimensions without any machining. Open-die forgings need substantially more machining allowance.
After flash trimming and shot blasting, closed-die forgings have a consistent Sa 2.5 surface free from the scale pockets and rough surface typical of as-cast parts. This reduces pre-machining and plating prep time.
Automotive safety standards, IS 9419, and OEM supplier quality requirements mandate forged or equivalent material for steering, suspension, and axle components. Casting is generally not accepted for these applications.
Although a closed-die forging may cost more than a casting in the rough, it typically needs 30–50% less machining to reach final dimension. Total manufactured cost including machining is usually lower for forgings in moderate-to-high production volumes.
Closed-die forging — impression die forging, drop forging — is how most of the world's safety-critical metal components are made. Stub axles, king pins, connecting rods, gear blanks, drill collar tool joints: the list of components that demand forged rather than cast material is a long one, and for good reason. The process of forcing heated steel into a shaped die cavity produces a part whose grain structure mirrors its geometry. That directional grain flow is not visible in a cross-section or on a CMM report, but it is responsible for the fatigue life that keeps trucks on the road and drill strings in the wellbore for millions of operating cycles.
Our Shapar, Rajkot press shop runs 250T, 400T, 630T, and 1000T forging hammers and presses — a range that covers the typical weight band of automotive, agricultural, and industrial forgings from 100 g to 50 kg. The tool room is in-house, which matters more than most buyers realise. When tooling is made externally, die corrections require off-site coordination, delay samples, and add cost to every revision. Our CAD-to-CNC tool room turns design changes around in hours, not weeks. New tooling for a first article is typically ready in 4–6 weeks from drawing approval.
The comparison with casting is not straightforward because casting has genuine advantages for certain geometries — complex internal passages, thin-wall housings, and very large components where no press is big enough to forge them. But for solid sections carrying fatigue loads, the comparison goes firmly in favour of forging. Standard engineering cast iron has a fatigue limit around 100–200 MPa; cast steel is somewhat better. A closed-die forging in EN8 steel (C45) has a fatigue limit above 280 MPa, and in EN24T above 450 MPa. For a stub axle or a connecting rod, that difference is the margin between a component that lasts 600,000 km and one that might not.
Material flexibility is another strength of our closed-die capability. The same press shop that forges mild steel brackets can run EN24 stub axles, 316L stainless valve bodies, or aluminium 6061 suspension wishbones. The critical variable is temperature and die material — higher-temperature alloys need more die wear management — but our tool room engineers design for that from the start. We do not restrict customers to a single material family. If your drawing calls for Duplex 2205, SAE 4340, or 17-4PH stainless and the part is within our weight range, we can forge it.
If you are looking for a closed-die forging manufacturer in India for a new component or a production transfer, contact Shivam Forge at +91-9265772827 or email info@shivamforge.com. Send us a 2D drawing or 3D model, the material specification, heat treatment condition, annual volume, and required PPAP level. We will come back within 24 hours with a piece price, tooling cost estimate, and first-article lead time — enough information to make a sourcing decision.
Closed-die forging (also called impression-die or drop forging) is a hot metalworking process where heated billet is compressed between two dies that contain the mirror impression of the required part. The metal fills the die cavity and takes its shape. Flash is formed at the parting line and trimmed off after forging.
In closed-die forging, the dies fully enclose the part shape and control all dimensions. Open-die forging uses flat or simple-shaped dies and relies on operator manipulation to achieve the rough shape — suited for large, simple shapes like shafts and discs. Closed-die gives better dimensional control, more complex shapes, and is suited to medium and high production volumes.
Forgings have better fatigue strength (aligned grain flow), no porosity or shrinkage, higher impact toughness, and better dimensional consistency than castings. Castings are better for very complex internal geometries (cored passages) or very large parts where forging press capacity is not available. For structural and load-bearing components, forging is almost always the engineering-preferred choice.
For standard steel closed-die forgings, ±0.5 mm on external dimensions and ±0.8 mm on depth dimensions are typical. Tighter tolerances require additional machining. We will specify achievable forging tolerances when quoting based on part geometry and weight.
We close-die forge components from 50 grams (small pins, keys, valve balls) to 50 kg (large flanges, connecting rods, hub assemblies) in our Shapar press shop. For components above 50 kg, open-die forging or split tooling is used.
We routinely closed-die forge carbon steels (IS 2062, C45, C55), alloy steels (EN8, EN19, EN24, EN36, 42CrMo4, 4340), stainless steel (304, 316, 410, 431, 17-4PH), aluminium alloys (6061, 7075), and copper-based alloys. Material selection depends on application loads, corrosion requirement, and heat treatment.
We design and manufacture the closed dies in our in-house tool room — typically 4–6 weeks for first die set. We then produce first-off samples, run CMM inspection, and prepare the PPAP package. Customer approval of the PPAP triggers production tooling release. Tooling is owned by Shivam Forge unless a buy-out agreement is made.
For existing tooling: 15–25 working days. For new tooling: 6–8 weeks for dies plus 3–4 weeks for first samples. Send your drawing, material grade, heat treatment requirement, and annual volume to info@shivamforge.com. We respond within 24 hours with a quotation covering piece price and tooling cost.
Why Choose Shivam Forge
Shivam Forge delivers precision hot-forged components from our integrated Shapar, Rajkot facility — covering forging, CNC machining, heat treatment, and quality inspection under one roof.
