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Precious Metal Continuous Casting Machine
Precious Metal Continuous Casting Machine
COOLDO CDO-JC downward continuous casting machines melt gold, silver, karat gold, copper, brass and bronze, then pull the solidifying profile downward through a matched graphite mold and water-cooled crystallizer. The verified range—CDO-JC15, JC20, JC30, JC35 and JC45—is selected from the required profile, alloy, silver-reference batch, surface quality and downstream rolling or drawing process rather than melting capacity alone.
Start with the finished profile—not the furnace capacity
Send a dimensioned drawing of the required wire, rod, tube, bar or strip. The graphite mold, crystallizer, withdrawal program, atmosphere and cooling are then selected around that section and alloy. A larger melting capacity does not automatically produce a larger or better profile. Small sections, hollow shapes and oxidation-sensitive alloys often need slower traction and tighter temperature control.
Choose the downward-casting atmosphere configuration
Both machines below are CDO-JC downward continuous casting configurations. The standard machine uses controlled inert-gas protection; the sealed vacuum version is selected only when oxidation-sensitive karat gold, brass or a specified alloy needs tighter atmosphere control. This product family does not include upward vertical casting equipment.
From molten alloy to continuous semi-finished profile
Melt and homogenize
The alloy is melted by induction and held under a suitable protective atmosphere. Electromagnetic movement helps temperature and composition uniformity.
Feed the die
Molten metal enters the matched graphite mold and water-cooled crystallizer. Heat removal establishes a stable solidification front.
Program downward withdrawal
Servo-driven traction pulls the solidifying profile downward in controlled steps. Speed and pause settings are tuned to section, alloy and surface quality.
Cut or collect
Bars and strip can be cut to length; wire, rod or tube may use a take-up or downstream rolling and drawing process.
Continuous casting machine model comparison
| Model | Power | Silver capacity | Melting time | Casting speed | Max. reference bar size |
|---|---|---|---|---|---|
| CDO-JC15 | 15 kW | 3 kg | 5–8 min | 10–20 cm/min | 40 × 10 mm |
| CDO-JC20 | 20 kW | 6 kg | 5–8 min | 10–20 cm/min | 50 × 10 mm |
| CDO-JC30 | 30 kW | 20 kg | 7–8 min | 10–20 cm/min | 80 × 10 mm |
| CDO-JC35 | 35 kW | 30 kg | 11–15 min | 10–20 cm/min | 100 × 20 mm |
| CDO-JC45 | 45 kW | 50 kg | 10–14 min | 10–20 cm/min | 120 × 20 mm |
Capacity note: Published figures are model-selection references. Usable capacity and cycle time change with metal density, alloy, charge shape, safe crucible level, utilities and production method.
Machine size and die-envelope reference
| Model | Machine size | Weight | Upper die diameter | Lower die diameter |
|---|---|---|---|---|
| CDO-JC15 | 800 × 600 × 1650 mm | 280 kg | 88 mm | 60 mm |
| CDO-JC20 | 900 × 700 × 1750 mm | 330 kg | 120 mm | 80 mm |
| CDO-JC30 | 1000 × 800 × 1850 mm | 600 kg | 160 mm | 120 mm |
| CDO-JC35 | 1350 × 1000 × 2100 mm | 680 kg | 210 mm | 160 mm |
| CDO-JC45 | 1450 × 1150 × 2200 mm | 800 kg | 234 mm | 170 mm |
Finished profiles produced by the CDO-JC machine
These are output examples—not separate machines. Finished geometry determines the graphite mold, crystallizer, traction program and downstream rolling or drawing equipment.
Configuration, applications and project planning
Supported output families
- Round and shaped wire or rod billets.
- Flat bar and strip for rolling or stamping.
- Hollow tube with matched mandrel and die design.
- Rectangular and special profiles within the confirmed envelope.
- Semi-finished stock for drawing, rolling, machining or minting.
Atmosphere and process options
- Nitrogen or argon protection for standard precious-metal alloys.
- Sealed vacuum configuration for oxidation-sensitive processes.
- Downward traction through the matched graphite mold and crystallizer.
- Programmable traction speed, pause and cooling settings.
- Optional automatic feeding for longer campaigns.
Optional line equipment
- Fixed-length shear or cutting unit.
- Wire or strip take-up spool and guiding system.
- Mold and crystallizer sets for confirmed profiles.
- Cooling-water chiller and filtration package.
- Downstream rolling mill or drawing equipment.
Data required before die design
- Dimensioned cross-section and tolerance.
- Complete alloy composition and charge form.
- Target surface quality and downstream operation.
- Required length, coil weight and daily output.
- Voltage, protective gas, cooling and floor-space restrictions.
Frequently asked questions
Can one graphite die make plate and round bar?
No. Every cross-section needs a matched graphite mold and crystallizer geometry. A new product family normally requires a different die set.
Can the same machine cast gold, silver and copper?
Compatible alloys are possible within the confirmed temperature and capacity range, but each alloy needs its own process settings and suitable consumables.
How is casting speed selected?
Speed follows section size, alloy, solidification behavior, crystallizer temperature and surface requirement. The published 10–20 cm/min range is a reference, not a fixed setting for every profile.
When is a vacuum model necessary?
A sealed vacuum configuration is evaluated when normal nitrogen or argon protection cannot adequately control oxidation or alloy stability.
Can it produce hollow tube?
Yes, when the die, mandrel, crystallizer, alloy and withdrawal program are designed for the required inside and outside dimensions.
Does the machine include dies for every size?
No. The quotation lists the confirmed die and crystallizer sets. Additional profiles require separate engineering and consumables.
Can cutting or take-up be automated?
Yes. Fixed-length cutting, take-up spools, guides and automatic feeding can be integrated after the finished product and line layout are confirmed.
Confirm the correct configuration before quotation
Send COOLDO the metal or alloy, normal and maximum batch, target product, daily output, local voltage, cooling conditions and destination country. The engineering team will confirm the machine, consumables, utilities, installation scope and optional equipment before quotation.