Deep drawing

What draw ratio is possible in one deep drawing stage?

Sources

1. Deep Drawn vs Progressive Stamping: Process Guide | Balford
   Deep drawing is the right choice for deep, cylindrical parts. As a rule of thumb, if part depth exceeds about 1.5 times the diameter, a progressive die will struggle—the carrier strip restricts material flow, causing tearing and distortion. Deep drawing lets the blank move freely, pulling metal into...
2. Drawn Sheet Metal & Deep Drawing: Complete Guide | Balford
   Each stage has to stay inside the material’s limiting draw ratio. When work-hardening closes that window, an intermediate anneal restores ductility before the next draw. Ratios fall after the first draw: second and later draws achieve less reduction than the first. Redrawing. A tall part is not simp...
3. Drawn Sheet Metal & Deep Drawing: Complete Guide | Balford
   Too low → wrinkles in the flange, and those wrinkles travel into the wall Too high → material cannot flow, the wall stretches instead, and the part tears at the die radius On a deep drawing tool the blank holder pressure is adjustable, because the correct setting depends on the actual mate...
4. Deep Draw Stamping & Deep Drawn Metal Stamping Guide | Balford
   What is the difference between deep drawing and stamping? Deep drawing forms a flat blank into a seamless cup or housing. Stamping covers the operations that finish the part: trimming, piercing, flanging, embossing, tapping. In production both run in the same tool or the same line, which is why the ...
5. What Is The Maximum Draw Ratio For Deep Drawing?
   Balford deep draws up to 250 mm diameter in Zhuji, Zhejiang, on presses from 25 t to 350 t, with tooling designed and built in-house — which matters here because the draw ratio, the die radii and the number of stages are tooling decisions that have to be taken together. We run DC01 and DC04 mild ste...
6. Deep Drawing Design Considerations for Engineers | Balford
   Draw ratio is the blank diameter divided by the punch diameter for a given stage. It is the single number that decides how many stages a part needs. A conservative ratio may form in one stroke; an aggressive ratio requires redrawing, and each extra stage adds a die station, a press pass and a chance...

What an engineer still needs from you

• material and material condition (grade, temper)
• material thickness, plus the key diameter, height and wall thickness
• tolerances, burr direction and the visual acceptance standard
• annual volume - it decides whether tooling is single-hit, progressive or transfer
• surface finish, and any secondary machining, annealing or plating

This page is an engineering answer, not a quotation and not a dimensional acceptance. It is generated from Balford's published material and held to the verified company fact sheet.