Focus processes: fine blanking and thinning deep drawing
How are multi-stage thinning draws and annealing sequenced?
Answer
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 material lot, its thickness tolerance, and the lubricant. This is also why deep drawing tooling needs tryout time that press forming does not. Single draw, redraw, and the multi-stage deep drawing process When the required ratio exceeds the material's single-draw limit, the part is formed in stages: a multi stage deep drawing process takes the blank through two or more draws, and each intermediate shape is called a redraw.
Why this page is short
Published material currently supports only part of this question. The page states what is known and stops, rather than filling the gap with a plausible number. The missing detail sits on the review board waiting for an engineer.
Sources
- 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...
- DC04 vs DT4E Pure Iron: Which Fits A Solenoid Housing?Under the press the ranking reverses. DC04 is bought for forming: its specification includes mechanical properties and a mill-controlled normal anisotropy that keeps a cup from earing badly and lets a single draw take a larger reduction, which usually means fewer stages and less interstage annealing...
- Automotive Sensor Housing Manufacturer | BalfordBalford draws sensor housings in 304, 316L, 310S and 430 stainless. The grade is decided by the sensor, not by convenience: 304 and 316L for pressure, ABS and exhaust-side temperature sensors; brass for coolant and water temperature sensor housings, where faster thermal response matters more than co...
- How To Calculate Blank Size For A Deep Drawn Cup?Does the blank size change when a part needs more than one draw? No. The blank stays the same for the whole part, because it holds all the material the finished cup will ever contain. What changes between stages is the preform diameter — the size of the partially drawn cup after each stage. Multi-st...
- 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...
- Stainless Steel Sensor Housing Manufacturing By Deep DrawingCan stainless sensor housings be made without annealing? Shallow parts often can. Deep or multi-stage draws in 304 or 316L usually need intermediate annealing to relieve work hardening and prevent cracking. Why is concentricity so critical? Because it positions the sensing element and controls assem...
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
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Related questions
- What is fine blanking?
- Fine blanking vs conventional blanking: which should I specify?
- What edge quality does fine blanking achieve?
- Which materials and thicknesses suit fine blanking?
- What tooling does fine blanking need and what drives its cost?
- Fine blanking vs laser cutting vs machining for a flat functional part?
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.