Buyer Resource
Casting Process Selection Guide
Which casting approach is right for my part? This guide explains what part characteristics drive process selection — geometry, quantity range, structural requirements, and part function — and when to send a drawing for a supplier process review.
Casting Approach Options
How casting approach affects part outcome
Different aluminum casting approaches produce different structural outcomes, suit different part geometries, and are optimized for different production volume ranges. The right approach for a given part depends on a combination of factors: part weight and envelope size, wall section range, annual production volume, surface finish requirements, and mechanical property targets.
A single casting approach is rarely the only viable option — for many parts, two or more routes are technically feasible, with the final choice depending on tooling cost, lead time, and volume commitment. Your supplier can review the drawing and recommend the approach that fits your program.
Key Selection Inputs
Part characteristics that guide process selection
When reviewing casting process options, a supplier typically asks for: part weight and envelope dimensions, wall section range (thinnest and thickest walls), annual volume range and project stage, surface finish expectations, mechanical requirements or heat treatment need, and any assembly or sealing interface constraints.
Providing these inputs at the drawing stage allows the supplier to assess which casting routes are feasible and give a recommendation with context — rather than quoting without a confirmed process fit. Early input is especially valuable before tooling decisions are made.
Volume and Project Stage
How volume range affects casting options
Annual production volume and project stage are among the most important inputs for casting process selection. Different aluminum casting routes suit different volume profiles. Some approaches favor structural, lower-volume programs and support heat treatment for higher mechanical performance. Others optimize for cycle time at higher annual quantities with thin-wall geometry.
Sharing your volume range and project stage — prototype, pilot, or production — allows the supplier to narrow the options and explain which approach fits the program before tooling is ordered.
Early Discussion Value
Why early process discussion reduces project cost
Process decisions made before tooling is ordered allow the supplier to flag wall-section adjustments, draft angle requirements, and parting line placement that affect tooling cost and casting yield. A design-for-manufacturing review at the drawing stage is a low-cost step that can avoid expensive tooling rework and revision cycles later.
Early process discussion also gives the buyer a clearer picture of the total cost range and lead time expectations before committing to tooling investment.
Process Uncertain
What to send when process choice is uncertain
If the right casting process is not yet clear, send the drawing or sketch, part weight estimate, annual volume range, alloy or mechanical requirement, and a brief description of the part function. A supplier can use these inputs to suggest a process option and explain the fit.
Early process discussion before tooling is ordered often reveals wall-section adjustments, draft additions, or alloy changes that reduce cost and improve yield. This is a low-risk step in the RFQ preparation process.
Ask for process review
Not sure which process fits your part? Upload drawings and sourcing context for a Bohua process review.
FAQ
Buyer questions about casting process selection
What files should I send with an aluminum casting RFQ?
Send 2D drawings and 3D models along with part weight estimate, envelope size, annual volume range, and alloy or mechanical requirement. If the process choice is uncertain, describe the part function and operating context and let the supplier recommend a process option.
Can I request a review before the drawing is final?
Yes. A preliminary sketch or early-stage drawing can still support a process fit discussion. Sharing part weight, wall section estimates, and volume intent early allows the supplier to give useful process guidance before tooling decisions are finalized.
What if I am unsure which casting process fits the part?
Describe the part weight, wall sections, functional requirements, and annual volume. A supplier can review your drawing and recommend a casting approach based on these inputs. Sharing a drawing — even a preliminary one — is the best way to get a process recommendation that fits your specific part.
Should I include quantity range and project stage?
Yes. Volume range is one of the most important process selection inputs. Annual volume and project stage directly affect which casting approach suits the program — both in terms of tooling type and process route. Share your volume range and project stage with the drawing, and ask the supplier which options fit.
Can photos or existing samples help the review?
Photos of an existing part or competitor sample help the supplier understand the surface quality expectation, geometry intent, and any features that influence process selection. This is especially useful for replacement and second-source RFQ projects.