Aluminum sand casting uses sand as the mold material. To compare it with a gravity permanent-mold proposal, identify the mold that contains the metal, any tooling used to make that mold and the features formed by cores.
The words “sand” and “permanent” do not describe every item in the production route. A reusable tool may produce a sand mold. A metal mold may use sand cores. Ask the foundry to identify its proposed arrangement before comparing tooling or delivery scope.
1. Which mold contains the molten metal?
Harrison Castings’ sand-casting description identifies sand as the mold material. Its air-set process forms two mold halves, removes the pattern, joins the halves and fills the mold. After cooling and solidification, the sand is broken away from the casting.
By comparison, Le Sueur’s gravity-pour description uses iron or steel molds. It explains static pouring and tilt pouring, then opening the mold and ejecting the casting. Its permanent-mold offering includes different filling arrangements.
These are descriptions of the manufacturers’ processes. They do not approve either route for your component or establish a universal advantage in price, accuracy or properties. Obtain a drawing-specific proposal from the actual foundry.
| Item being discussed | Question to ask |
|---|---|
| Mold containing the metal | Is the cavity in sand or an identified metal mold? |
| Pattern or other mold-making tooling | What does this tool make, and what is included? |
| Core forming a specified feature | Which feature and tooling reference does it belong to? |
This original table separates item identities. It is not a process-selection chart. Keep the foundry’s actual terminology and proposed tooling arrangement beside the component drawing.
In an aluminum sand casting quotation, ask the supplier to distinguish the mold from the pattern. A price labeled “mold cost” may need clarification about which item it covers. The quotation should name the supplied or retained tooling.
For a permanent-mold proposal, retain the exact process description. Do not assume that every proposal labeled permanent mold uses the same filling method. Ask the foundry to identify what it is offering and which component features need later work.
2. Does a sand core identify the whole route?
Le Sueur describes semi-permanent mold construction as an iron or steel mold using sand cores to form geometry that the metal mold alone cannot create. A sand core therefore does not, by itself, identify the complete mold arrangement.
For an aluminum sand casting comparison, ask which internal or external feature each core forms. Keep its identity connected to the proposed component and drawing revision. A component photograph does not show the complete tooling arrangement used to produce it.
Imagine an original fictional housing H-14. The finished drawing identifies a passage P and a machined mating face F. Offer A lists a pattern reference and core K-A. Offer B lists a metal mold and core K-B.
Both offers mention a core. That shared word does not make the routes identical or establish that passage P meets the requirement. Ask each supplier to identify how P is formed and what later operations or inspection apply.
Keep face F in the comparison as well. Identify whether its final requirement is addressed in the casting delivery or by subsequent machining. A complete quote needs both the passage definition and the delivered mating-face condition.
This fictional example contains no approved casting design, measured passage or accepted material. Its purpose is to show which identities a buyer should connect before comparing offers.
Use a marked drawing instead of an inferred description
Ask the supplier to identify the proposed parting arrangement, core-formed features and later machining on the actual drawing or model. Have the responsible design team review any proposed geometry change.
If one offer leaves an opening for a later operation, name that operation and the party responsible for it. If another proposes forming the opening during casting, retain that route proposal for review. Do not quietly change the acceptance requirement to suit either offer.
Use the same finished component revision for the comparison. A quote based on H-14 revision A remains distinct from a proposal that changes the passage under revision B. Resolve the design decision before treating the offers as equivalent.
3. What does the tooling line actually include?
When reviewing aluminum sand casting tooling, request an itemized scope. Identify the pattern, core-making tooling where applicable, and any fixtures or later-operation tools included in the quotation. Keep each identity distinct from the consumable mold described in the route.
For the metal-mold proposal, request the same clarity about the actual mold, cores and subsequent-operation tooling. Do not compare two lines called “tooling” until both suppliers have defined their contents.
Ask for the project’s tooling ownership or use terms, storage arrangements and revision responsibilities. Obtain the actual commercial terms from the foundry. A general manufacturing description does not establish those agreements.
Return to H-14. Suppose its next drawing changes passage P while retaining face F. Ask each supplier to identify the affected tooling, required verification and revised quotation. Retain that response beside the changed drawing.
A change that affects one feature should remain visible in the tool list and proposal. Do not assume that an unchanged overall part outline means no tooling work is needed. Have the foundry identify the impact for its actual arrangement.
Keep the delivered casting and finished component separate
An aluminum sand casting price may cover one production stage, while another offer covers a machined and finished component. Write a delivered-item description for each proposal so the buyer can see what remains after receipt.
State the material requirement, supplied condition, included machining and specified finishing. Identify any required dimensional, material or functional records at the appropriate stage. Ask suppliers to list exclusions alongside their included operations.
Keep the inspection plan tied to the defined component and delivery. A report for an earlier stage should identify that stage. If final features require later work, identify who produces and evaluates them.
Our extrusion versus die-casting guide addresses a different route comparison. Keep its high-pressure die-casting description distinct from the gravity permanent-mold proposal discussed here.
The short version for an RFQ
Request the proposed route and itemized tooling against the finished drawing. Have the foundry identify how the mold and any cores form the component, which operations remain afterward and what the quoted delivery contains.
Does reusable tooling mean the mold itself is reusable?
Identify the tool’s function. Keep mold-making tooling and the mold containing the metal separately named.
Does a sand core mean the whole mold is sand?
No. Ask the foundry to identify the complete arrangement; Le Sueur describes sand cores within a metal-mold route.
Review profile cutting when the project includes supplied stock
Send JiurunCut the defined aluminum stock section and cut requirements when the project includes that delivery stage. Keep the foundry route, casting-tool approval and finished-component scope with the responsible suppliers and design team.