Appliance housing and shell moulds.
White goods are the least forgiving consumer product to tool: a visible face the size of a table, an assembly tolerance set by robots, and a cost target set by a retail price. We build the tools for all three at once.
A big visible face has nowhere to hide.
A washing-machine front panel or a TV back cover is a large, mostly flat, textured surface. Every flow mark, every hesitation line and every ejector shadow lands on something the customer will look at for ten years. The tool answer is grain plus balanced fill: a grained cavity scatters light and hides the small stuff, and a balanced fill keeps the flow front moving in one direction instead of meeting itself in the middle.
Internal parts have the opposite problem. A tub or liner is structural: ribs, bosses, screw pillars and a sealing face that has to hold water or foam. Ribs that are too thick sink on the outside face, ribs too thin do not fill. We size them in the tool design against your wall-stock rule and confirm the fill before cutting.
Assembly is where appliance tools quietly fail. A control-panel bezel that snaps into a housing has four or five clip positions, and if two of them fight each other the panel creeps and cracks in the field. We cut clip geometry from the same model as the mating part whenever we build both, and check the snap force on trial parts.
Surface, structure, assembly
Large housings are usually single cavity, with hot runner and a textured cavity. Structural parts get slides for undercuts, and sometimes gas assist where thickness varies.
- Cavity steel: 718H for textured faces, S136 ESR where a high-gloss or piano-black finish is required.
- Gate: hot runner, valve or open, positioned so the flow front runs in one direction across the face.
- Cooling: dense circuits behind the visible face, independent zones for face and ribs.
- Texture: MT or VDI grain to an agreed plaque, matte where fingerprints would show.
- Slides and lifters: for undercuts, handle recesses and clip seats.
- Gas assist: available where wall sections vary and sink is a risk.
Where appliance projects save money
Cycle time dominates the part cost on large housings, so cooling design pays for itself within weeks. The other saving is tooling two mating parts together: the assembly tolerance is then a drawing decision rather than a trial-and-error loop.
What we build to
| Typical part size | Up to 1,200 × 800 mm, 1–4 kg |
|---|---|
| Cavities | 1, or 2 for smaller panels and bezels |
| Cavity steel | 718H textured / S136 ESR for high gloss |
| Gate | Hot runner, valve or open, flow-direction dependent |
| Cooling | Dense multi-zone, face and rib circuits separated |
| Cycle time | 40–75 s |
| Tool life | 500,000–1,000,000 shots |
| Press tonnage | 800–2,000 t |
| Lead time | 12–16 weeks from design freeze |
Send the cosmetic requirement with the drawing: high gloss, grained, or painted. It changes the steel, the polish, the texture cost and sometimes the gate position — and it is the single most common reason an appliance tool misses its target cost.
What appliance OEMs ask us.
Can you tool both the housing and the panel that snaps into it?
Yes, and it is the better route. When both parts come from the same model, the clip positions and the assembly gap are a drawing decision instead of a trial loop. It also means one supplier is accountable for the fit.
What is the difference between textured and high-gloss cavities?
A textured cavity is etched to a grain standard and hides flow marks, which suits most white goods. A high-gloss cavity is polished to a mirror and shows everything — it needs a better fill balance, more temperature control on the tool, and a higher steel grade.
How do you stop sink marks on thick cosmetic sections?
Three levers: reduce the section in the tool design, add gas assist, or pack harder with better cooling behind the thick area. We look at the wall stock first, because fixing geometry is free compared with fixing cycle time later.
Do you supply tools for the EU and North American markets?
Regularly. Tools are built to metric drawings, documentation is in English, and we can work to your corporate mould standard — including preferred steel grades, component brands and numbering conventions.
Send the housing drawing and the cosmetic spec.
Gloss, grain or painted — tell us which. You get steel grade, gate position, cooling zones and lead time in the reply.