Brass Casting

The primary methods for plate-making are manual wax carving and CAD wax carving. Manual carving involves shaping wax based on design drawings, while CAD carving uses 3D software and wax spraying equipment for precision shaping.

A brass mould is made using the lost wax casting method. Lost wax casting involves filling the area around the wax mold with plaster. After heated, the wax mold melts away, leaving behind a cavity which forms the model for casting. Molten copper is then poured into this cavity to solidify into a copper piece.
This process is used for producing brass molds.

Place the brass mould into rubber, heat it at high temperatures to fix the rubber film. Cut the film into two pieces, remove the copper plate, leaving the cavity for injecting wax.

Melt the wax and inject it under pressure into the rubber mold using a wax injection machine. After injecting the wax, let the mold sit for 2-3 minutes. Carefully take out the wax after it cools.
Simple repairs the wax, removing burrs and fixing surface defects. Repeat this process to produce mass production.

Arrange the wax molds in an order and solder them layer by layer onto a wax rod, forming a wax tree shape like a large tree.

Pour plaster: Place the wax tree into a steel cylinder, seal it to prevent liquid from leaking out of the steel holes, pour in prepared plaster slurry, vacuum to remove bubbles, and let it solidify.

Bake plaster: Put the steel cylinder into an oven, melt the wax at high temperature to create voids. These voids are used for casting copper alloys.

Melting: Melt copper beans at high temperature into liquid form.
Casting: Pour the solution from the wax outlet, let the liquid flow into the void, and cool into shape.

After cooling for a period of time, immerse the steel cylinder in cold water. The plaster dissolves upon contact with water, allowing the copper tree to be removed. Use a water gun to wash away the remaining residue.

Use pliers to cut the copper piece from the copper tree. The remaining part of the wax tree can be melted away for recycling.

In the jewelry making process, polishing is crucial and time-consuming. Each lost wax casting blank is manually adjusted and polished to remove minor edges, burrs, etc., from the surface, ensuring the jewelry is smooth and neat.

The final process in jewelry processing involves treatment with weak sulfuric acid followed by rinsing with clean water. After cleaning, the jewelry can be air-dried directly.