What is a servo press?

A servo press uses servo motors for precise force and position control during forming operations.

How do I calculate servo press tonnage?

Use our free tonnage calculator at servopress.club/tonnage-calculator.html

Hot Stamping vs Cold Stamping on Servo Press: Structural Parts

admin

B-pillars, door beams, and bumper reinforcements can be made by hot or cold stamping.

## Hot Stamping

Heats boron steel to 900-950C, forms and quenches in water-cooled die. Result: 1500-2000 MPa.

Press requirements:
- Forming speed: 50-150mm/s
- Dwell at BDC: 5-15 seconds for quenching
- Cycle time: 10-20 seconds

## Cold Stamping of UHSS

980-1500 MPa UHSS, no heating required.

Press requirements:
- 2-3x tonnage vs mild steel
- Forming speed: 30-80mm/s
- Dwell at BDC: 100-300ms

## Which to Choose?

Hot stamping: higher strength (1500-2000 MPa), better formability, less springback.

Cold stamping: no furnace ($2-5M saved), faster cycle (3-5s vs 10-20s), lower energy.

B-pillars/door beams: hot stamping. Bumper reinforcements at 980 MPa: cold stamping increasingly preferred.

yuki_rnd

This is my area. For B-pillars above 1500 MPa, hot stamping is still the only viable option —you can't cold form 22MnB5 after quenching. But for 980-1180 MPa parts, cold stamping on a servo press is increasingly competitive. Our latest work shows that servo press cold forming of 1180 MPa DP steel can achieve 90% of the properties of hot stamped 22MnB5, at 1/3 the cost per part.

sarah_mfg_eng

We run both processes. Hot stamping line cost us $4.5M. Servo press cold stamping line for similar parts: $1.2M. The hot stamping line makes sense for ultra-high volume (500K+ parts/year) but for lower volumes, cold stamping on servo press wins on economics every time.