Sand casting
Metal is poured into a cavity formed in a sand mould. Cores can create internal passages.
CASTING PROCESS GUIDE
Sand Casting vs Investment, Die and Permanent Mould Casting
Compare four mould systems against your component’s geometry, alloy, quantity, tooling and quality requirements. No single casting process is best for every project.
Four processes. Different mould concepts.
Investment casting, die casting and permanent mould casting are educational comparisons here, not services offered by Speed3D Mold.
Investment casting
A ceramic mould is formed around a pattern, commonly using a lost-pattern process.
Permanent mould casting
Metal is poured into a reusable metal mould, commonly by gravity.
Die casting
Metal is injected under pressure into a reusable metal die.
Schematic mould concepts — not production photographs. The investment illustration shows the shell around the pattern before pattern removal.
Compare the same decision factors
| Decision factor | Sand casting | Investment casting | Permanent mould casting | Die casting |
|---|---|---|---|---|
| Mould type / reuse | Expendable sand mould for each casting. | Expendable ceramic mould formed around a pattern. | Reusable metal mould, commonly filled by gravity. | Reusable metal die, filled under pressure. |
| Tooling concept | Review the pattern, core box or digital mould-production route. | Review pattern and ceramic-shell preparation. | Review dedicated mould tooling and its investment. | Review dedicated die tooling and its investment. |
| Geometry & cores | Cores can form internal passages. Review component size and mould arrangement. | Review design detail, pattern preparation and geometry requirements. | Review mould constraints, core arrangement and alloy suitability. | Review die design, cores, geometry constraints and alloy suitability. |
| Production planning | Review alloy, quantity and mould-production route. | Review alloy, quantity and pattern / shell preparation. | Review alloy, expected repeat production and tooling needs. | Review alloy, production quantity and whether dedicated tooling is justified. |
| Finishing & inspection | Define surface, dimensional and inspection criteria; include finishing and machining. | Define surface, dimensional and inspection criteria; include finishing and machining. | Define finishing requirements and inspection scope for the production plan. | Define repeatability and inspection criteria; include finishing, machining and schedule. |
A process decision depends on the actual component and production plan, not quantity alone. Neither route is automatically cheaper or more suitable.
Permanent mould and permanent mold refer to the same general process; spelling varies by region.
A practical process-selection checklist
Define these six requirements before comparing manufacturing routes.
Component requirements
Geometry, dimensions, internal passages and machining allowance.
Material
Required alloy, applicable specification and service conditions.
Quantity
One-off, low-volume or repeat production.
Tooling
Pattern, core box, ceramic mould or reusable metal mould / die requirements.
Quality criteria
Surface, dimensional, material and inspection requirements.
Project constraints
Schedule, available data, manufacturing capacity and the total production route.
A foundry or casting engineer can review these factors against the actual drawing, CAD model or physical reference.
Where 3D sand printing fits
A mould-production route,
not a metal-making process.
3D sand printing produces sand mould or core components from digital data. It does not itself produce the final metal component; the printed components are then used in a casting process.
For suitable projects, this route may be considered when conventional pattern tooling is unavailable, impractical or needs to be avoided for the required quantity. It is not automatically faster or less costly. Review geometry, material, quantity and schedule.
Request an Engineering Review
Discuss your drawing, CAD model or physical reference alongside the alloy, quantity, quality criteria and delivery needs.
Frequently asked questions
Is sand casting better than investment casting?
Not in every case. Compare the component geometry, alloy, quantity, mould preparation, finishing requirements and inspection criteria.
Is sand casting cheaper than die casting?
The total cost depends on the component, quantity, tooling, production route and finishing needs. A project-specific review is needed to compare costs.
When should I compare sand casting with permanent mould casting?
Compare them when deciding between an expendable sand mould and a reusable metal mould. Review tooling investment, alloy, geometry, expected repeat production and core requirements.
Does 3D sand printing replace sand casting?
No. It is a way to produce sand mould and core components. The metal part is still produced by casting.
What information is needed to recommend a process?
A drawing, CAD model or physical reference is useful, along with the alloy, quantity, service requirements, dimensional and inspection criteria, and delivery needs.
