Castings and forgings

Castings and forgings sit at the front of every programme schedule and at the bottom of every bill of materials. The lead times are long, the tooling is expensive, and switching suppliers later means buying the tooling again. So the purchase decisions here deserve more care per part number than anywhere else in the supply chain, and the questions are knowable in advance.

The tooling is the relationship

A pattern, a die or a mould is built for your part and usually priced as a separate line. Settle in writing who owns it, where it is stored, how its condition and modifications are recorded, and what happens to it if you move the work or the supplier closes. The industry's trade bodies, the Investment Casting Institute on the casting side and the Forging Industry Association on the forging side, publish process education and buying guidance that make the tooling and process conversation easier to have well.^1,2

Process choice is a cost choice

The same part can often be made more than one way: investment cast, sand cast, die forged, machined from billet. Each trades tooling cost against unit cost against properties.^1,2 A good supplier will tell you when your drawing is on the wrong process for your volume, because quoting the wrong process well is how they lose money slowly. Invite that conversation before the tooling order, not after.

The rules that follow the metal

Defense work brings sourcing rules with it. The specialty metals restriction in the defense acquisition regulations limits where the titanium and certain other metals in delivered articles may be melted, and the clause flows down the supply chain to the foundry and the forge.³ If your programme is defense, ask the supplier how it demonstrates compliance and how the melt source appears in its certifications, because this is a place where a paperwork failure undoes good metal.

Inspection follows the same logic as the rest of this directory's process categories: castings and forgings are routinely subject to non-destructive testing, and the testing houses carry their own audited accreditations under Nadcap.⁴ Ask what the drawing requires, who performs it and under what scope.

Questions that sort foundries and forges

Ask who owns the tooling and where the agreement says so. Ask for the certification package that ships with a lot: chemistry, mechanicals, melt source, NDT results. Ask what the real lead time was on the last three comparable jobs. The companies below are listed on public facts, each with its source linked; read them before the first quotation call and the call gets shorter.