Deep drawing
How do I calculate the blank size for a deep drawn cup?
Answer
How To Calculate Blank Size For A Deep Drawn Cup? Blank size for a deep drawn cup: the classical D = sqrt(d2 + 4dh) formula, the accurate surface-area method, a worked 50 mm example and the trim allowance. The blank diameter is the first number that decides whether a deep drawn cup is cheap or expensive, because it sets how much sheet metal goes into the press and how much of it ends up on the floor as trimmed rim. It is also the number most often copied from a similar part instead of calculated.
Sources
- How To Calculate Blank Size For A Deep Drawn Cup?How To Calculate Blank Size For A Deep Drawn Cup? Blank size for a deep drawn cup: the classical D = sqrt(d2 + 4dh) formula, the accurate surface-area method, a worked 50 mm example and the trim allowance. The blank diameter is the first number that decides whether a deep drawn cup is cheap or expen...
- How To Calculate Blank Size For A Deep Drawn Cup?Home › Blog › Deep Draw Metal Stamping Deep Drawing · Blank Development · DC04 & 304 How To Calculate Blank Size For A Deep Drawn Cup? Published September 26, 2026 · Balford Technical Team The blank diameter is the first number that decides whether a deep drawn cup is cheap or expen...
- Deep Drawing Calculation: A Worked Example | BalfordDeep drawing calculation: a worked example A 40 mm diameter, 30 mm deep cup in 1.0 mm DC04 — the blank, the draw ratio, the draw force, the press and the die clearance, all the way through, with every assumption written down so you can check it. What this is for. The point is not the numbers for thi...
- What Is Deep Drawing? A Clear Definition | BalfordWorked example: deep drawing calculation, step by step — a 40 mm × 30 mm cup worked all the way through: blank diameter, draw ratio, draw force, press and die clearance, with every assumption written down....
- Drawn Sheet Metal & Deep Drawing: Complete Guide | BalfordQuestions engineers ask What is deep drawing? Deep draw technical considerations All deep drawing articles Try it: deep draw force calculator — put in the blank diameter, the punch diameter, the sheet thickness and the tensile strength, and it returns the draw force, the draw ratio and a press...
- Deep Drawn Metal Stamping Manufacturer | BalfordMaterial Clearance per side Steel 1.1 – 1.3 t Aluminium 1.0 – 1.2 t Stainless steel 1.2 – 1.4 t Chapter 3 — Blank size before you cut anything For a cylindrical cup with diameter d and height h, the starting blank diameter is approximately √(d² + 4dh). It is an est...
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 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.