Deep drawing
How much wall thickness variation is normal in a deep drawn part?
Answer
Calculate the blank twice — once with the classical formula and once by surface area on the mean dimensions — and quote the difference. If the two numbers disagree by more than a few per cent, the bottom radius or the wall thickness is doing real work in your part, and that is exactly the detail the tooling review should settle before the blank die is made. Q: How do you calculate blank size for a deep drawn cup? A: Match the blank area to the surface area of the finished part measured on its mean surface: bottom disc, bottom corner radius and cylindrical wall.
Sources
- How To Calculate Blank Size For A Deep Drawn Cup?Calculate the blank twice — once with the classical formula and once by surface area on the mean dimensions — and quote the difference. If the two numbers disagree by more than a few per cent, the bottom radius or the wall thickness is doing real work in your part, and that is exactly the detail the...
- Drawn Sheet Metal & Deep Drawing: Complete Guide | BalfordAllow a trim allowance on the top edge. The drawn edge is uneven because of earing and normal process variation. Prefer a simpler profile over a stepped or tapered one if the function allows it. Each change of diameter can add a draw. Define which diameter is functional. If one diameter can be free,...
- Minimum Wall Thickness in Deep Drawing: Sensor HousingsThree ways wall thickness changes in production Thinning during drawing. Material flows and stretches, so the wall of a drawn cup is not the thickness of the blank. Tool radius, clearance and lubrication decide how much thinning happens and where. Ironing. Where the wall has to be thinned deliberate...
- Drawn Sheet Metal & Deep Drawing: Complete Guide | BalfordRelative wall thickness against position: about 1.00 times nominal at the bottom centre, thinning to roughly 0.85 in the lower wall, then recovering to about 1.05 at the top edge because the flange thickens as its circumference shrinks. 0.80t 0.85t 0.90t 0.95t 1.00t 1.05t 1.10t nominal blank thickne...
- How To Calculate Blank Size For A Deep Drawn Cup?Blank size for a deep drawn cup is calculated by matching the blank's area to the finished part's surface area, because the material volume does not change during forming. Measure the part on its mid-surface — mean diameter, mean height, mean bottom radius — then add three areas: the flat bottom dis...
- Deep Drawing vs Press Forming: How to Choose | BalfordThe inside surface finish matters (a drawn wall can be smoother than a machined bore) The part is currently machined from bar and the wall is thin — drawing can remove most of that machining 4. Wall thickness: the detail that surprises buyers In press forming the wall is the blank. In deep drawing t...
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
Next step. Send the drawing for a manufacturability review, or send the part data for a process and cost route.
Submit a drawing / RFQDFM review
Submit a drawing / RFQDFM review
Related 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?
- What draw ratio is possible in one deep drawing stage?
- How do I calculate the blank size for a deep drawn cup?
- How can I reduce cracking when deep drawing stainless steel?
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.