Focus processes: fine blanking and thinning deep drawing

When is forced thinning needed instead of a conventional draw?

Sources

1. Deep Drawing Design Guide | DFM for Housings
   Draw force , which sets the press tonnage. Balford runs presses from 25 t to 350 t and draws up to Ø250 mm. Die clearance , which controls thinning and the surface of the drawn wall. Rules of thumb worth following Round the base radius up, not down: it is the cheapest way to remove cracking ris...
2. Deep Draw Stamping & Deep Drawn Metal Stamping Guide | Balford
   When is ironing used instead of another draw? When the wall has to be thinner than the blank. Ironing pushes the part through rings so the wall thins while both the inside and the outside diameter stay under control - that is how thin-wall sleeves and solenoid housings are made. When is intermediate...
3. Metal Stamping Tolerances: Reading A Drawing Before Quoting
   In metal stamping, tolerances are process-dependent. Pierced and blanked features in thin material can typically hold tighter tolerances than formed features, because forming adds springback, thinning and radius variation. Hole-to-hole position depends on piloting and strip layout; wall thickness on...
4. Deep Drawn Metal Stamping Manufacturer | Balford
   How is wall thinning controlled? + Wall condition is managed through blank design, radii, draw sequence, lubrication, blank holder pressure and, where needed, ironing or restrike operations. Critical wall locations and the measurement method should be defined on the drawing or control plan. Can deep...
5. Deep Drawing Aluminium vs Stainless Steel: Tooling Changes
   Decision Aluminium Stainless steel Draw ratio per stage More generous More conservative; more stages Die clearance Tighter relative control to limit burrs and marking Set to accommodate work hardening and springback Radii Larger radii reduce cracking risk Radii balance crack risk against thinning Lu...
6. Drawing Die Straight Wall Cracking Causes | Balford
   ① Poor die surface finish or fit: If the product cracks and the flange shows scratches, polish the die surfaces with a grinding wheel to get a smooth finish that lets material flow easily. ② Die gap too tight: ②the gap is too small: When the side wall shows a shiny, cracked surface, that's typically...

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.