Mostly small to mid-size parts in ADC12 / A380, tooled from your drawing. Prototypes, pilot runs and volume all welcome. Gate and vent layout is settled before the mold is cut — porosity is not patched in afterwards.
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MOLD CHECK · BEFORE IT RUNS
Inspection records travel with the crate — the heat, the batch and the date are traceable.
Where the wall is twice as thick, it freezes last and nothing feeds it. That is a shrinkage cavity. Fix it with extra cooling on the heavy section, a different gate position, or core the thick area out and add ribs. Anything still fixable on the drawing should not wait for the trial shot.
Air folded in at the gate, or vents too small to clear it, ends up sealed inside the casting. It looks perfect as-cast and turns into pinholes the moment a face is milled. Either rework the gate and venting, run vacuum-assisted, or accept impregnation — three very different cost levels, and the choice is made before the mold is cut.
0.5–1° looks like nothing until the part galls, whitens or drags metal on the way out. Parts that get powder coated need more draft still — the coating makes them tighter, not looser. It never appears on the drawing, and it is always rework later.
Sheet metal is different: a drawing change means cutting a new blank. In die casting it means stripping the mold, welding up, re-EDM. Move a hole 2 mm and it can be a few thousand dollars and two weeks. Lock the 3D first.
Read next: how die casting works in China · the DFM checklist
Quoted on part complexity, part size and cavitation. A mold runs from the low tens of thousands into the hundreds of thousands of RMB — roughly US$5,000 to US$70,000, multi-cavity tools at the top of that range. Common practice is tooling included in the first order and amortised back across an agreed volume; the percentage and the volume threshold go on the quote, and nothing is refunded below it.
A single prototype is fine. But die casting only makes economic sense at volume: tooling amortised over a few dozen parts is ugly on the piece price. For a handful of urgent pieces I will say so and quote CNC or extrusion instead.
Complex geometry, a few hundred to tens of thousands of parts, low weight per part: die casting. Low volume, tight tolerances, a design still moving: CNC. In between, cut the prototype on a CNC first and tool up once the geometry stops changing — you pay for machining twice, but neither payment is wasted.
Yes, but test pressure, dwell time and allowable leak rate have to be stated up front. Leak-tightness comes from gate and vent design plus impregnation, not from adding wall thickness. Above roughly 0.2 MPa continuous, I would push you toward a machined part or a secondary seal.
A 3D file, a 2D drawing, or just a sample part — whatever you have. Within one working day: can it be cast, does it need tooling, roughly what it costs.