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How Open-die Forging Works

Open-die Forging: the route, the tolerances it holds, materials and design tips, with an indicative cost. One of 56 processes in the free finder.

Bulk formingFamily
+/-1mmTypical tol.
5Route steps
32Parts in finder

Open-die forging hammers or presses hot metal between flat or simple dies, shaping it by repeated blows while the smith manipulates the workpiece.

At a glance

When to use it, and when not

Best for

Large, simple, high-integrity shapes like shafts and rings where grain flow and strength matter.

Watch for

Loose tolerances and heavy machining allowance; not for fine detail.

Step by step

The typical route

Raw material to finished part. Steps vary with material, volume and tolerance; this is the free route from the finder.

  1. Heat

    Soak the billet to forging temperature.
    Tooling Furnace   Tolerance -   Lead -

  2. Open-die forge

    Hammer/press between flat or simple dies to rough shape.
    Tooling Press   Tolerance -   Lead -

  3. Trim

    Cut off excess, saw to length.
    Tooling -   Tolerance -   Lead -

  4. Heat-treat

    Normalise/quench and temper.
    Tooling Furnace   Tolerance -   Lead -

  5. Machine & UT

    Machine to size and ultrasonic test.
    Tooling CNC   Tolerance -   Lead -
Precision

Tolerances it can hold

TYPICAL TOLERANCE IT CAN HOLD
+/-1mm typicalcoarsefine+/-1mm+/-0.1mm+/-0.01mm+/-0.005mm
Where this process typically lands. Tighter is possible with extra operations like grinding, at higher cost.
Materials

Materials it suits

GradeWhy it suits this
Carbon/alloy steel (4140/4340)Strong, tough
Stainless 304/316Corrosion
TitaniumHigh strength-to-weight
Design

Design tips

A few general pointers for Open-die Forging. The full, part-specific DFM list is in the dossier.

  • Finish dims specified as-forged. Add machining stock.
  • Abrupt section change. Blend with radii.
Cost

What it costs

Large, strong shafts/rings/blanks at low volume; shape is rough so plan generous machining stock.

PER-PART COST vs VOLUME
one-offat volumeVolume per order, low to highCost per part
Per-part cost drops as volume spreads tooling and setup over more parts. The exact figures for your part at your volume, in your currency, are in the dossier.
MODEL EST.
$400 to 1120 per part at 1 off
A rough ballpark only. The dossier gives should-cost at your exact volume and currency, with the full breakdown.
GET THE FULL DOSSIER

Everything you need to quote and source it

The free route above is yours. To actually put a number on this process and buy it well:

  • Should-cost at your exact volume in 12 currencies, with the material, processing, tooling and overhead breakdown
  • Who to source from, typical MOQ and lead time, and the exact RFQ checklist to send
  • A quote checker that tells you if a supplier quote is fair, and the red flags to watch
  • The full DFM list and a ready-to-send RFQ draft
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Examples

Parts made by Open-die Forging

32 parts in the finder use Open-die Forging as their primary process. A sample, each with its own guide:

big ringcrankshaft largedie blockforged rollkingpinlarge crankshaftlarge flangemill shaftrail couplingrailway buffership anchortruck axle
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FAQ

Frequently asked questions

How is a part made by Open-die Forging?
Open-die forging hammers or presses hot metal between flat or simple dies, shaping it by repeated blows while the smith manipulates the workpiece. The typical route is: Heat; Open-die forge; Trim; Heat-treat; Machine & UT. Large, simple, high-integrity shapes like shafts and rings where grain flow and strength matter.
What does Open-die Forging cost per part?
It depends on size, tolerance and volume. As a rough ballpark it starts around $400 to 1120 per part at low volume and falls with quantity. The dossier gives should-cost at your exact volume and currency. Model estimates, not quotes.
What tolerance can Open-die Forging hold?
Typically about +/-1 mm, tighter with extra finishing operations at higher cost.
What materials suit Open-die Forging?
Common choices are Carbon/alloy steel (4140/4340) (Strong, tough); Stainless 304/316 (Corrosion); Titanium (High strength-to-weight).
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