Aluminum die casting produces complex metal housings and brackets at lower piece cost than CNC once die tooling is justified. OEM programs often combine casting with secondary CNC for precision bores and sealing faces.
Aluminum die casting produces complex metal housings and brackets at lower piece cost than CNC once die tooling is justified. OEM programs often combine casting with secondary CNC for precision bores and sealing faces.
Where die casting fits
- High or medium volumes of aluminum geometries with bosses, ribs and pockets.
- Parts that need better isotropic bulk than heavily welded fabrications.
- Enclosures where EMI and heat sinking matter.
Process and quality notes
| Topic | Buyer guidance |
|---|---|
| Alloy | Specify (e.g. ADC12 / A380 class) not just “aluminum” |
| Porosity | Define leak/pressure tests if sealing is critical |
| Draft & fillets | Casting DFM differs from CNC plate design |
| Secondary CNC | Call out datums and machining stock |
| Finish | Shot blast, powder coat, machining bright |
Tooling and lead time
Die casting dies are significant investments. Validate design with CNC prototypes when risk is high. Plan T-sample dimensional reports and impregnation only if specified for porosity control.
RFQ package for die casting
- STEP + 2D with critical machined dimensions.
- Alloy, weight target, annual volume.
- Pressure/leak requirements if any.
- Surface finish and coating.
- Secondary machining list.
HC-Mold die casting OEM
HC-Mold offers die casting with secondary operations in its China OEM portfolio alongside CNC and molding. ISO 9001:2015 · Chang'an, Dongguan · contact@hc-mold.cn · +86-769-85327002. Free DFM; reply ≤12h; quote ≤24h on complete RFQs.
Secondary machining and sealing surfaces
As-cast surfaces rarely meet precision bore or flatness needs for covers and pump housings. Define which faces are cast cosmetic and which are milled. Leave explicit machining stock and datums that still exist after flash trim. Leak testing after machine is cheaper than discovering porosity in final assembly abroad.
Trimming, shot blasting and powder coating add lead time and fixturing. Color standards for powder coat need panels. If machining reveals subsurface porosity on sealing lands, agree in advance on impregnation or scrap rules so quality arguments are not improvised.
Combine casting RFQs with CNC capacity checks at the same OEM to avoid shipping rough castings across provinces for simple face mills. HC-Mold’s multi-process model is built for that integrated flow under one ISO 9001:2015 system.
Buyer checklist before you issue the PO
Confirm drawings are revision-controlled, materials are purchasable in China within your schedule, and inspection methods are agreed in writing. Ambiguity at PO stage becomes cost later. List secondary operations, packaging and labeling so they are not treated as free extras. If multiple factories are bidding, freeze the same specification package for all—do not let informal calls create hidden scope differences.
Align internal stakeholders: industrial design owns cosmetics, engineering owns function, procurement owns total cost and risk. A single RFQ owner should consolidate feedback so the manufacturer receives one voice. For export programs, involve logistics early on Incoterms preference and whether tools or finished goods will cross borders.
aluminum die casting OEM China decisions improve when data is complete. HC-Mold International Co., Limited in Chang'an, Dongguan, Guangdong, China operates under ISO 9001:2015 with free DFM on complete packages, reply within 12 hours, and quote within 24 hours when files, material, volume and finish are clear. Email contact@hc-mold.cn or call +86-769-85327002. Prototype CNC frequently supports MOQ of one piece when geometry is defined.
Documentation to keep in your program folder
- Final quote with assumptions listed line by line.
- NDA and tooling ownership clauses if molds are involved.
- Approved DFM screenshots and CAD revision that matches the PO.
- Sample reports (dimensional and visual) with clear accept/reject notes.
- Packaging photos and carton specs for repeat orders.
FAQ
Is die casting cheaper than CNC always?
At volume, usually yes per piece. At very low quantity, CNC wins because dies cost more upfront.
Can castings be anodized like 6061?
Cast alloys anodize differently and less predictably than wrought 6061; qualify finish samples.
What MOQ is typical?
Higher than CNC prototypes; exact MOQ depends on shot weight and setup—ask with your forecast.
Do you machine after casting?
Yes—secondary CNC is commonly quoted with cast blanks for precision features.
Ready to source aluminum die casting? Send your STEP/IGES drawings, material notes, volume band and finish requirements via our RFQ form. HC-Mold International Co., Limited is a direct OEM manufacturer in Chang'an, Dongguan, Guangdong, China (ISO 9001:2015). Contact: contact@hc-mold.cn · +86-769-85327002. Free DFM review; reply ≤12h and quote ≤24h on complete RFQ packages.
Talk to HC-Mold engineering
Free DFM · reply ≤12h · quote ≤24h on complete RFQ · ISO 9001:2015 · Dongguan, China