What This Part Is And Why It Is Made This Way
Appearance parts are accepted or rejected by eye, which makes them the hardest aluminium castings to supply consistently. Surface defects that are invisible on a machined face are obvious under paint.
Frames and appearance parts are cast, then painted, coated or anodised, with appearance and porosity control listed as a specific requirement for this business.
What You Get From This Route
Appearance and porosity control treated as a defined requirement, not an afterthought.
Film thickness inspection keeps finish consistent between runs.
High pressure die casting suits large batches of thin walled appearance parts.
Application Scenarios
- Machine outer frames and covers
- Visible equipment panels
- Product housings with finished surfaces
- Decorative structural frames
Who It Is For
- OEMs with branded, visible machine surfaces
- Buyers rejecting parts on cosmetic grounds
- Designers specifying a finish across a product family
Technical Features
- Typical requirements: appearance and porosity control, dimensional and assembly control
- Surface treatment: painting, coating, anodising
- Film thickness inspection
- High pressure die casting for large batches of thin wall parts
What Buyers Run Into Without This Specification
- Porosity shows through the paint after finishing.
- Colour varies between batches and parts cannot be mixed on one machine.
- Finishing is bought separately and nobody owns the final appearance.
Published Material Weight And Process Data
Figures below are the published capability for aluminum alloy casting. Part specific values — tolerance on individual features, finish, packing — are confirmed at drawing review and marked TBC until then.
| Material | ADC12, A380, EN AC-42100 (A356), EN AC-43000 (AlSi10Mg), EN AC-46000, EN AC-46100 |
|---|---|
| Heat Treatment | F, T4, T6 |
| Process | Sand casting; gravity die casting; high pressure die casting; low pressure metal and sand die casting |
| Gravity Die Casting | 5-15 min per part; min wall 3 mm; CT7-CT8; Ra 6.3-12.5 μm; batch 500-20k pcs |
| High Pressure Die Casting | 15-60 sec per part; min wall 0.8 mm; CT4-CT6; Ra 3.2-6.3 μm; batch 1k-100k pcs |
| Low Pressure Die Casting | 3-8 min per part; min wall 2.5 mm; CT7-CT8; Ra 6.3-12.5 μm; batch 100-10k pcs |
| Sand and Low Pressure Sand | 2-48 hours per part; min wall 3-6 mm; CT10-CT11; Ra 12.5-25 μm; batch 1-1000 pcs |
| Part Specific Tolerance | TBC — confirmed against the customer drawing |
| Minimum Order Quantity | TBC — depends on the process route selected |
| Lead Time | TBC — confirmed with the production base at quotation |
How The Part Is Made And Checked
- Secondary Process — Machining and forming, welding, extrusion, forging and CNC machining.
- Surface Treatment — Painting, coating and anodising.
- Quality Inspection — X-ray for internal defects, 3D scanning for complex surfaces, spectrum analysis for composition, pressure testing for housings, CMM for critical dimensions and film thickness for coatings.
Quality management is based on ISO 9001 and covers supplier management, raw material inspection, production process control and final inspection. Inspection results are archived and traceable.
Options And Alternatives
Parts are produced to the customer drawing rather than to a fixed catalogue item, so material grade, machining scope, surface treatment and packing are all specified per order. Machining, dimensional control, surface treatment and necessary pre-assembly can be added to the same supply route.
Where another process family would suit the part better — for example a forging in place of a casting for a shock loaded connector — that comparison is raised during drawing review rather than after tooling is committed.
How To Specify This Part
Agree a boundary sample for appearance before the first production run. Written descriptions of surface quality rarely survive contact with a real batch, whereas an agreed physical reference settles the question quickly.
- Send the drawing with material, quantity, quality standard and target delivery date.
- State the inspection class and the zones it applies to, rather than a general note.
- Confirm the packing requirement and the lifting equipment available at the destination.
Related Guides
Other Parts In This Range
Lightweight Structural Components
Weight reduction without losing section strength
View specifications
Wheel Discs and Rotating Components
Spoked discs and rotating aluminium parts
View specifications
Aluminum Housing Components
Enclosures, covers and pressure tight housings
View specifications
Large Steel Structural Castings
Load bearing steel castings up to 20 tonnes
View specificationsFrames and Appearance Components — Frequently Asked Questions
How is appearance quality agreed?
Appearance and porosity control is listed as a typical requirement for aluminium parts and is confirmed during the drawing and standard review stage.
Do you handle painting and anodising?
Yes. Painting, coating and anodising are part of the surface treatment scope coordinated in the same supply chain.
What do you need to prepare a quotation?
Drawings, material, quantity, quality standard and target delivery date.
Which inspection is included?
The inspection scope is agreed during drawing review. X-ray for internal defects, 3D scanning for complex surfaces, spectrum analysis for composition, pressure testing for housings, CMM for critical dimensions and film thickness for coatings.
Get A Quotation For Frames and Appearance Components
Send the drawing and the application. We will confirm the process route, the production base and the inspection scope before quoting.