Heat treatment and surface finishing
What is annealing and why is it needed after deep drawing?
Answer
A deep drawn solenoid valve housing is formed from flat strip into a one-piece cup, so the sidewall is continuous parent metal and carries no longitudinal weld seam - the same part is also described as a seamless or weldless (nahtlos) housing shell. Balford draws these housings on presses from 25 t to 350 t with a maximum drawn diameter of 250 mm. A first draw on mild steel such as DC04 normally stays inside a limiting drawing ratio (LDR) of about 2.0 to 2.2, which for a 40 mm diameter cup means roughly 35 mm of depth before a redraw is needed; deeper shells take two or more draws with interstage annealing.
Sources
- Solenoid Valve Housing: Why There Is No Weld SeamA deep drawn solenoid valve housing is formed from flat strip into a one-piece cup, so the sidewall is continuous parent metal and carries no longitudinal weld seam - the same part is also described as a seamless or weldless (nahtlos) housing shell. Balford draws these housings on presses from 25 t ...
- Solenoid Valve Housing: Why There Is No Weld SeamState the wall thickness at the functional zone rather than one nominal for the whole part - the wall thins as material flows into the die. Name the material and its temper, because formability and the number of draws follow from that choice. Define the leak requirement with the test method and the ...
- Aluminium Grades For Deep Drawing: 1050, 1100, 3003, 5052For deep drawing, specify 3003 in O temper as the default, 1050 or 1100 where the draw is severe and strength is secondary, and 5052 or 5754 only for moderate draws where strength and corrosion resistance are needed. Never specify 6061 for a deep drawn housing. Always name the temper as well as the ...
- What Is The Maximum Draw Ratio For Deep Drawing?Count the stages. Above three stages in 304, plan the interstage anneal before you plan the tool, because the heat treatment becomes part of the critical path Key point The maximum draw ratio is a material and tooling number. If a quotation offers a deep 304 housing at a first-draw ratio of 2.0 with...
- Deep Drawing Steel Grades: DC01 to DC06 and EquivalentsCan you deep draw stainless steel instead of a DC grade? Yes, and for corrosion resistance or a non-magnetic requirement it is often the right answer, but the behaviour is different: austenitic stainless work hardens far faster and usually needs interstage annealing that a low carbon grade does not....
- Deep Drawing Design Considerations for Engineers | BalfordDesign guidance Deep Drawing Design Considerations The five decisions that drive cost and feasibility are draw ratio, corner radius, wall thickness reduction, material grade and whether inter-stage annealing is needed. Send your drawing All FAQ topics 5 Decisions that drive cost Ø250 mm Maxim...
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.
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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.