Gear Blank Forging Manufacturer India | Spur, Helical, Planetary

Shivam Forge is a dedicated gear blank forging manufacturer based at Shapar GIDC, Rajkot, Gujarat, producing closed-die forged blanks for spur gears, helical gears, bevel gears, ring gears, planetary stages and sun gear sets. The fundamental metallurgical advantage of a forged gear blank over a blank machined from rolled bar stock lies in grain flow orientation: when die geometry is correctly designed, the metal grain aligns with the tooth profile, placing the strongest grain direction against the bending stress at the tooth root. Gear blanks machined from rolled bar have grain flow running perpendicular to the tooth root — essentially the weakest orientation for tooth-bending fatigue loading. Shivam Forge's near-net-shape die design ensures that grain flow follows the tooth contour, delivering a 40–60% improvement in tooth-bending fatigue life on case-hardened gears.

Material selection for gear blank forgings is driven by the hardening route and the gear's service duty. EN36 (20NiCrMo2) and SAE 8620 are the primary grades for carburised and case-hardened gears — the low carbon core retains toughness while the carburised case achieves 58–62 HRC for surface wear resistance. EN19 (42CrMo4, AISI 4140) is the standard for through-hardened industrial gears, offering the combination of high hardenability, good machinability and excellent fatigue resistance needed for industrial gearbox shafts, pinions and worm gears. EN24 (AISI 4340) is specified for the most demanding applications — mine hoist gearboxes, crane drive gearboxes, offshore winch drives — where high torque, shock loading and extended service intervals demand the highest core strength and toughness available in a Cr-Ni-Mo alloy steel.

The commercial case for near-net-shape gear blank forging versus bar stock machining becomes compelling above module 4 and OD 200 mm. At these dimensions, the weight of material machined away from a bar blank to produce the gear disc profile is significant — typically 30–50% of the input bar weight. Near-net-shape forging reduces this to 10–20%, and the hobbing allowance reduction from 15–25 mm per side (bar blank) to 3–5 mm per side (forged blank) directly reduces gear hobbing machine cycle time and cutter consumption. For wind turbine ring gears in the 800–1200 mm OD range, forging the ring profile near-net saves 200–400 kg of material per blank — a commercially significant figure at EN24 alloy steel prices.

Shivam Forge supplies forged gear blanks to gearbox OEMs across India's wind energy sector, mining equipment industry, industrial drive manufacturers, agricultural equipment makers and automotive transmission suppliers. Our quality documentation package for gear blanks includes a material test report (chemistry and mechanical properties to EN 10083, ISO 683 or AISI limits), dimensional inspection report, heat treatment record and — on request — forging grain flow macrostructure certificate. ISO 9001:2015 certification and 20+ years of forging experience underpin the consistency that gearbox OEMs and Tier 1 gear manufacturers need from a critical blank supplier.

To discuss forged gear blank requirements for your gearbox or gear manufacturing programme, contact Shivam Forge at +91 92657 72827 or sales@shivamforge.com. Provide your component drawing, grade specification, OD, bore and face dimensions, supply condition required and annual volume. We will confirm forging capability, advise on near-net-shape opportunities to reduce your machining cost and provide a competitive quotation with lead time within 48 hours.

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