Deep drawing
What draw ratio is possible in one deep drawing stage?
Answer
Which process is better for deep, cylindrical parts? 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 the cavity through staged reductions, so you get a clean, consistent part.
Sources
- Deep Drawn vs Progressive Stamping: Process Guide | BalfordWhich process is better for deep, cylindrical parts? 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 d...
- Drawn Sheet Metal & Deep Drawing: Complete Guide | BalfordEach 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...
- Drawn Sheet Metal & Deep Drawing: Complete Guide | BalfordToo 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...
- Metal Drawing Manufacturer: Processes And How To SpecifyQ: How do I know whether a drawn part needs one draw or several? A: The limiting draw ratio for a single draw is roughly 2.0 to 2.2 depending on the material, which means the first draw can reduce the blank diameter by about half. A part deeper than that is made in two or more stages, with an anneal...
- Metal Drawing Manufacturer: Processes And How To SpecifyHow do I know whether a drawn part needs one draw or several? The limiting draw ratio for a single draw is roughly 2.0 to 2.2 depending on the material, which means the first draw can reduce the blank diameter by about half. A part deeper than that is made in two or more stages, with an anneal betwe...
- How Many Draws Does A Deep Drawn Part Need?Take a 40 mm outside diameter, 30 mm high cup in 1.0 mm DC04. The blank works out at 80 mm, so the overall ratio is 2.0. That is right at the edge of the DC04 first-draw limit, so the part is planned as two draws rather than gambling on a single operation. Stage Diameter Ratio for that stage Within ...
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
Need a DFM feasibility assessment for your project?
Send the engineering drawing (STEP or PDF) with the material grade, thickness and annual volume. Balford engineers then check it against the process window - draw ratio, wall thickness, tolerances, blank and tooling route - and come back with what is feasible and what is not. An answer on this page cannot replace that review.
Upload a drawing for DFM reviewHow the DFM review worksRelated questions
- What is deep drawing?
- Deep drawing vs progressive die stamping: which process fits my part?
- What is the maximum deep draw diameter and press capacity?
- How do I calculate the blank size for a deep drawn cup?
- How can I reduce cracking when deep drawing stainless steel?
- What are the common deep drawing defects and their causes?
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.