Three facts that decide this page
- 5052 is the usual choice for formed covers and brackets because it forms better than 6061 at the same thickness, while 6061 is specified where strength or machinability matters more than formability.
- Ganesh runs mechanical presses from 20 T to 300 T, a 250 T punching press and an in-house tool room at Mumbai (Vasai), so tool design, build and maintenance stay under one supplier.
- 5052 forms well and is the usual choice for covers and brackets; 6061 T6 is strong but cracks at tight radii and is better machined than drawn. Aluminium does not spring back like steel in the same way, and galling on the die is a real risk, so lubricant and die surface finish matter. Scrap value is high, which affects nesting and blank design.
What changes when you stamp aluminium
5052 forms well and is the usual choice for covers and brackets; 6061 T6 is strong but cracks at tight radii and is better machined than drawn. Aluminium does not spring back like steel in the same way, and galling on the die is a real risk, so lubricant and die surface finish matter. Scrap value is high, which affects nesting and blank design.
The commercial consequence is that aluminium is priced on its own material line, not blended into a steel rate. Material grade, thickness, tolerance and finish are quoted separately from conversion, so a change of specification is visible in the price.
Tolerance, edge and finish
Ganesh quotes to the drawing first and to ISO 2768 general tolerances where the drawing is silent. For aluminium stamping, the practical starting points are in the table below. They are starting points, not a guarantee: the part geometry, thickness and fixturing decide what can actually be held, and the quotation states the tolerance offered.
How Ganesh runs this route
Blanking, piercing, forming and drawing are quoted as one press route; the number of stations, not the tonnage alone, usually decides whether a part is worth tooling. Aluminium needs a dedicated pretreatment; a phosphate line built for steel will not give the same adhesion, and chromate-free conversion is the practical route for a mixed-material shop. The route is quoted as one sequence so the customer does not have to coordinate a cutter, a former, a welder and a coater.
When stamping is the wrong route for aluminium
Stamping aluminium is the wrong route when the part is a one-off heat sink or a small batch of brackets; laser cutting and forming is cheaper and avoids a tool that may never be used again.
A manufacturability review before quotation is the cheapest place to find this out. Send the drawing, material, finish and annual quantity and the review comes back in writing.
Typical parts
- Heat sink brackets
- Covers and housings
- Electrical mounting plates
- Lightweight panels
Decision rule: when to choose stamping
Use stamping when the geometry is frozen and the annual quantity repays the tool. As a working rule, a simple bracket in a single-stage tool becomes cheaper than laser-cut-and-formed at roughly 3,000–8,000 parts a year; a progressive tool needs more volume because the tool itself costs more. Below that range, laser and bend keeps the cash free and the revision cheap. Between the two, quote both and compare total cost over the programme life, not the first order. For aluminium the practical constraint is the oxide layer and the alloy temper: pretreatment, bend radius and weld procedure all change relative to steel, and the drawing needs to name the alloy, not just the word aluminium. Aluminium is where the alloy decision matters as much as the process decision: a part specified in 6061 T6 that really needs 5052 will be quoted twice and made badly once.
What to put on the drawing
State the material grade and blank thickness, the tolerance on every functional feature, the burr direction and height where it matters, the grain direction if the part is drawn, and whether the tool is customer-owned or supplier-built. Name the inspection level. If the part will be welded, say so, because the burr and the flatness that a welding fixture needs are not the same as for a plain bracket.
Quality evidence and inspection
Inspection covers dimensional features, burr height, material thickness and hardness at sample frequency, plus a first article report before production. Ganesh holds tools in the in-house tool room, so die maintenance records and tool history are available with the part. PPAP documentation is available where the programme requires it.
What drives the cost
Cost splits into material, tooling, press time, secondary operations and inspection. Tooling is a one-off and is quoted separately, so the piece price only makes sense against an annual quantity. Press time is driven by stroke rate and the number of stations, not by part weight. Secondary operations such as deburring, tapping, welding and coating often exceed the press cost on a small part. On aluminium, material is quoted as its own line at the prevailing rate for the grade and thickness, so a change of specification is visible rather than hidden in a blended rate.
| Specification | aluminium stamping | Ganesh limit or note |
|---|---|---|
| Grades | 1050, 5052 and 6061 to ASTM B209 / IS 737 | Grade per drawing |
| Thickness | 0.8–6 mm sheet; cut to 10 mm plate | 20–300 T mechanical, 250 T punching |
| Tensile / property | 110–310 MPa depending on alloy and temper | 2.70 g/cm³ density |
| Alloy and temper | 1050 H14, 5052 H32, 6061 T6 | 5052 for forming, 6061 for strength |
| Bend radius | 0.8–1.5 × thickness typical | Tight radii crack on 6061 T6 |
| Laser cutting | Fast, high reflectivity | Clean nozzle and correct pierce height |
| Stamping | 20–300 T mechanical, 250 T punching | Tonnage sized from perimeter, thickness and shear strength |
| Tolerance basis | ISO 2768-m unless drawing states otherwise | Critical features inspected |
| Finish | Etch or conversion pretreatment, then powder coat where specified | Specified per part |
Sources and review
- ASTM B209 — Aluminium and aluminium-alloy sheet and plate · reviewed 2026-11-03
- IS 737 — Wrought aluminium and aluminium alloy sheet and strip · reviewed 2026-11-03
- ISO 2768-1 — General tolerances · reviewed 2026-11-03
- ASTM B209 aluminium sheet for forming · reviewed 2026-11-03
Combines Ganesh machine limits (20–300 T mechanical, 250 T punching) with aluminium grade and property data. The "what changes" section is written for this material–process pair and is not reused on another page.
Send the drawing and we will check the route
Material, thickness, tolerance, finish and annual quantity are enough for a manufacturability review. Tooling is quoted separately from the piece price.
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