Chang Gu Viet Nam logo CHANG GUViet Nam Co., Ltd
Automated shell making line

How your part is made

Twelve controlled steps from your drawing to a packed, inspected component. Every step below runs inside our own plant.

Engineering first

Before any steel is cut

We review your drawing for castability, then simulate both the tool and the pour. Gating, shrinkage and fill are settled on screen so the first sample is a usable part.

Tooling layout showing parting line and shrink allowance

Tooling design

Die layout, parting line and shrink allowance built from your 2D or 3D data.

Casting solidification simulation showing hot spots

Casting simulation

Fill and solidification modelled to place gates and risers before the tool exists.

3D CAD model review of a cast part

Model review

Feature-by-feature check of tolerances, wall thickness and machining stock.

Production

The casting line

PLC-controlled wax injection machine

PLC wax injection

Wax patterns shot under programmed pressure and temperature, with automatic de-moulding.

Assembled wax tree ready for shell building

Tree assembly

Patterns welded onto a runner tree, inspected and weighed before shell building.

Automatic slurry dipping cell

Slurry dipping

Robot-guided dipping gives even coating thickness on every tree in the batch.

Automatic sand shower coating a ceramic shell

Sand shower

Automatic stuccoing builds the shell layer by layer to the specified thickness.

Shells drying on racks before de-wax

Controlled drying

Climate-managed racks hold each coat until it is dry. This is where shell cracks are prevented.

Autoclave used for steam de-waxing ceramic shells

Autoclave de-wax

Steam de-waxing empties the shell fast enough to avoid expansion cracking. Wax is PLC-recycled.

Shell sintering furnace

Shell sintering

Shells are fired to burn out residue and reach pouring strength.

High-frequency induction melting and pouring

Melting & pouring

High-frequency induction melting, spectrometer-confirmed chemistry, then pouring into hot shells.

Grinding and deburring a casting

Cut-off & finishing

Shell knock-out, gate cutting, grinding, blasting and polishing to the agreed surface.

CNC milling of a cast component

CNC machining

Turning, milling, drilling and threading to final drawing tolerance on our own machines.

Inspector measuring a part on the CMM

Inspection

CMM dimensions, material report and leak testing, to the scope agreed for your part.

Finished goods warehouse ready for export

Packing & export

Packed to your marking requirements and shipped through our own import and export operation.

Why automation matters here

The shell line decides your scrap rate

In investment casting, most defects are born in the shell, not in the pour. Uneven dipping, rushed drying and inconsistent stucco produce cracks, inclusions and dimensional drift that only appear after machining — when the part is already expensive.

That is why our dipping and sand shower are machine-controlled and our drying is climate-managed. It is the least glamorous part of the plant and the one that protects your delivery date.

Shell trees on climate-controlled drying racks

Have a drawing? Get a casting quote.

Send a 2D drawing or 3D model with material, quantity and market. You get a manufacturability review and a price.

Start an RFQ