Warm Forging
Warm forging occupies the middle ground: hot enough to cut flow stress and forming loads substantially, cool enough to avoid heavy scale and thermal shrinkage error. For gear blanks and transmission parts it delivers near-net accuracy that neither pure route achieves economically.
- Working Temperature
- 750 – 950 °C
- Tolerance
- ±0.2 mm typical
- Scale Formation
- Minimal
- Press Load
- ~50% of cold forging
- Best Applications
- Gear blanks, splined shafts, hubs
- Material Saving
- 15 – 25% vs machining from bar
Warm Forging at a glance
Quotable facts from Avadh Techno Forge, Gundasara, Gondal, Rajkot.
- Working Temperature: 750 – 950 °C
- Tolerance: ±0.2 mm typical
- Scale Formation: Minimal
- Press Load: ~50% of cold forging
- Best Applications: Gear blanks, splined shafts, hubs
- Material Saving: 15 – 25% vs machining from bar
The 750–950°C Window
Below the scaling threshold but above the cold-forming load limit, warm forging cuts press tonnage by roughly half compared with cold work while holding tolerances two to three times tighter than hot forging. Billet temperature is held within a ±20°C band because the process window itself is narrow.
Ideal for Toothed and Splined Blanks
Gear blanks, sprockets, clutch hubs and splined shafts benefit most: teeth and splines can be formed close to final profile, leaving only a finishing cut. Grain flow follows the tooth contour, which measurably improves root bending fatigue against cut-from-solid gears.
- Near-net gear and spline profiles
- Reduced hobbing and shaping time
- Improved root fatigue strength
- Lower press loads than cold forming
Material and Surface Benefits
Scale formation is minimal, so surfaces stay clean and dimensional loss is small. Because deformation happens below recrystallisation, a degree of strain hardening is retained, letting some parts skip a subsequent hardening operation altogether.
People also ask
What temperature is warm forging done at?
750 to 950°C, held within about ±20°C because the usable process window is narrow.
Which parts benefit most from warm forging?
Gear blanks, splined shafts, clutch hubs and sprockets, where near-net teeth and splines remove machining operations.
Topics covered on this page
- warm forging India
- warm forged components manufacturer
- warm forging process supplier
- near net shape forging India
Based on work carried out at our own forging plant at Gundasara, Gondal, Rajkot — operating since 2008.
Questions Answered
Why choose warm forging over hot forging?
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When the drawing demands tighter tolerance and a cleaner surface than hot forging gives, but the geometry is too complex or the alloy too strong for cold forming.
Does warm forging need lubricant?
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Yes — graphite or synthetic die lubricant is applied every stroke to control friction and protect die life at these temperatures.
Can gear teeth be finished directly by warm forging?
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Near-net teeth can be formed with a small finishing allowance. A light hobbing or grinding pass then achieves the required DIN quality class.
What volumes justify warm forging?
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Generally 5,000 pieces per year and above, where saved machining time repays the tighter process control and tooling.