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Auxiliary Facilities

Water chiller

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[what is Air cooled water chiller]

Air-cooled water chiller is one of the models of water chiller, the normal temperature water will be cooled to a certain temperature through the compressor of the chiller to strengthen the cooling mold or machine, as a stand-alone use, the radiator is a built-in fan, there are three interconnected systems: refrigerant circulation system, water circulation system, electric automatic control system.

The air-cooled water chiller model is compact, small and movable. CDOCAST water chillers are mainly used in the cooling of intermediate frequency furnace and continuous casting, mainly applied in the process of lowering the temperature of the power supply furnace, to protect the whole equipment from the damage of high temperature. Sometimes, it is also used in the cooling of semi-products cooling.

Machine Pictures

Parameter

Model number	CDO-W3P	CDO-W5P	CDO-W10P	CDO-W15P	CDO-W20P	CDO-W30P
Cooling temperature	5-35℃
Voltage	380V, 3P, 50/60Hz
Refrigerating capacity	7216Kcal/h	12790Kcal/h	28184Kcal/h	44419 Kcal/h	59442Kcal/h	87741Kcal/h
Total power	3.6KW	5.5KW	11KW	17KW	22.7KW	30KW
Max current	8.8A	13.3A	26.3A	41.3A	55.4A	76.8A
Compressor power	2.25KW	3.75KW	7.5KW	11.25KW	15KW	22.5KW
Air fan power	0.36KW	0.36KW	0.6KW	1.1KW	1.1KW	3.3KW
Cooling water flow	5m³/h	5 m³/h	12 m³/h	16m³/h	16m³/h	20m³/h
Water tank capacity	65L	110L	188L	350L	400L	480L
Pump power	0.55kw	0.55kw	1.5KW	1.85KW	2.2KW	3KW
Hydraulic head	20M	25M	20M	20M	30M	28M
Weight	100KG	220KG	350KG	490KG	590KG	850KG
Overall dimension(cm)	11860100	13055135	15670137	17070162	19080173	260100180

Feature

1:The compressor unit adopts vortex type hermetically sealed compressor and electric control components, and is equipped with condenser and evaporator made of high quality copper tube for heat transfer and high efficiency.

2:CDOCAST water chiller Equipped with all kinds of safety protection devices, stable performance, low noise, long service life, simple operation; the use of liquid crystal display man-machine interface, simple and convenient operation, operating conditions at a glance.

3:The water chiller are equipped with single compressor or multi-compressor combined refrigeration system. The compressor can automatically alternate the operation according to the load change and balance the running hours of each compressor to save energy and extend the service life of the chiller set. It is convenient for energy adjustment and more energy-saving at partial load.

4:the whole water chiller designed with shell box structure & attractive appearance &compact structure, the chiller can be checked at any time; the chiller comes with its own water tank and circulating water pump according to the cooling capacity, without the need for installation of cooling tower and cooling water pump, installation and maintenance is simple and convenient.

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FAQ

1. Why is our water chiller more expensive than others?

Our chillers use a Siemens control system, which offers key advantages:

High Reliability & Stability: Siemens PLCs and touchscreens are built for harsh industrial environments, resisting interference, vibration, and temperature/humidity changes.
Precise Temperature Control: Advanced algorithms (e.g., PID) enable accurate control, with fluctuations as low as ±0.1°C to ±0.3°C.
Energy Efficiency: The system dynamically adjusts compressor, pump, and fan speeds based on cooling demand, optimizing performance and reducing waste.

2. What determines the cooling effect of a water chiller?

Cooling capacity depends on how much heat is removed from the source and dissipated into the environment per unit of time.

Water Tank (10% role): Provides thermal buffer and stability. A larger tank slows temperature changes and reduces compressor cycling, but does not generate cooling.
Refrigeration System (90% role): Performs the actual heat transfer:

- Compressor: The “heart” of the system; its power defines max cooling capacity.
- Evaporator: Absorbs heat from the circulating water.
- Condenser & Fans: Release absorbed heat into the atmosphere.

3. Why do you use stainless steel tanks instead of cast iron?

Feature	Cast Iron Water Tank	Stainless Steel Water Tank
Cost	Lower	Higher
Corrosion Resistance	Poor, prone to rust	Excellent, rust-free
Water Purity	May be contaminated with rust	Keeps water clean
Lifespan	Shorter	Long
Weight	Heavy	Lighter
Maintenance	Frequent anti-rust care is needed	Low, almost maintenance-free
Hygiene	Low	High
Typical Use	Cost-sensitive, low-purity applications	Precision equipment, clean environments, long-life needs

4. What is the service life of a water chiller?

Running 24/7: Refrigerant may need replacement after 6–7 years.
Running 2–3 hours/day: Refrigerant may last about 10 years.
Lifespan depends on maintenance. Avoid use in strongly acidic/alkaline environments or outdoors without protection.

5. What spacing is needed between multiple chillers?

Keep 1–1.5 meters between units.
If placed near a wall, maintain 0.8–1 meter clearance for proper ventilation.

6. What causes frequent high-temperature alarms?

Room too small, poor heat dissipation.
Solution: Move chiller outdoors (with rain cover) or install fans outside.
Change tank water every 2–3 weeks, especially when cooling precious metals like gold/silver.

7. Is higher pump pressure better?
No. Excessive pressure strains the pump, risking burnout. Too low pressure reduces water flow and cooling efficiency.

8. Is a higher pump power better?
No. Overpowered pumps can cause pipe bursts or system damage.

9. How do you match chiller models to different machines?
We select based on machine power, usage frequency, and operating environment. Please provide these details before purchase.

10. Can anti-freeze fluid be used in your chillers?
Yes, our chillers support the use of anti-freeze fluid.

Hydraulic Minting Press

Hydraulic Press For Minting

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Premium Hydraulic Press for Minting | Gold & Silver Coin Stamping

CDOCAST specializes in manufacturing high-precision hydraulic minting presses designed for creating sharp, detailed designs on gold and silver bars and coins

How Our Hydraulic Minting Press Works

At the heart of our machine is a powerful hydraulic system. The process begins when a hydraulic pump converts mechanical energy into hydraulic energy. This energy is then transmitted via specialized hydraulic oil to a hydraulic cylinder, which converts it back into controlled mechanical force. This force is applied with high precision to stamp your custom designs onto workpieces, ensuring every detail is captured perfectly.

Choosing Your Ideal Minting Solution

① Economical Logo Stamping Machine: Ideal for clients who require a simple, cost-effective solution for pressing custom patterns onto gold bars. This model is compact, user-friendly, and perfect for applications where a basic, high-quality stamp is sufficient without the need for an automatic ejector.

② Advanced Hydraulic Coining Press: Necessary for minting high-relief coins and complex bars. This robust press is designed for demanding production environments and can be equipped with automatic features for enhanced efficiency and output quality.

③ Robust Structural Options: Our presses are available in two primary structures to suit your technical requirements:

④ Four-Pillar Hydraulic Press: Offers exceptional stability and alignment under high tonnage, ideal for the most critical minting applications.

⑤ Frame-Type Hydraulic Press: Provides superior rigidity and guiding accuracy, ensuring consistent performance and prolonged die life. Furthermore, they can be configured with the cylinder positioned above or below (C-frame style), providing flexibility for various production line setups.

⑥ Tailored to Your Minting Needs: Each of our hydraulic presses can be equipped with an automatic control panel for simple operation, allowing for easy adjustment of pressure and speed. The required press tonnage is determined by the material thickness, coin size, and design complexity of your pattern. As a complete solution provider, CDOCAST also offers professional custom logo and mold design services to bring your unique vision to life.

Tailored Solutions for Every Minting Challenge

We understand that your needs are unique. That’s why we offer a range of solutions:

▶ For straightforward logo stamping, our compact and economical model delivers reliability and value.

▶ For complex coin and bar production, our advanced hydraulic coining presses offer the robustness and control required for high-volume, high-quality output.

▶ With a choice between the superior alignment of our four-pillar presses and the exceptional rigidity of our frame-type models, you can select the perfect foundation for your precision work.

▶ From Concept to Coin
Beyond the machine itself, we partner with you throughout the process. From recommending the ideal tonnage for your specific material and design to providing end-to-end custom mold design and manufacturing, CDOCAST is your single source for a complete minting solution.

Hydraulic Press For Minting main features include:

• High Efficiency & Power: Hydraulic power transmission provides high energy conversion efficiency, generating significant pressure and force for demanding applications.

• Robust & Simple Design: Featuring a relatively simple structure and a compact design, our hydraulic systems are engineered for reliability and ease of maintenance.

• Precise Control: Operators can easily and accurately adjust both pressure and speed via control valves, ensuring simple operation for different processing needs.

• Smooth Operation: The press maintains a stable working process with minimal vibration, which is critical for achieving high processing accuracy.

• Versatile Applications: This hydraulic press is suited for a wide range of processing techniques, including stamping, forming, cutting, and pressing.

• Built-in Safety: Modern safety features are integrated to guarantee secure and reliable operation at all times.

Machine Pictures

100-1000 Tons Frame Hydraulic Press Machine

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100-1000 Tons Four-column Downstroke Hydraulic Press Machine (Touch Screen & Servo Motor)

Fully Automated Hydraulic Press Machine

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Dies：

Click to Learn More About the dies

Parameter


Model		Unit	CDO-100M1	CDO-200M1	CDO-300E1	CDO-500M1	CDO-1000M1	CDO-1500M1	CDO-2000M1
Rated capacity		Ton	100	200	300	500	1000	1500	2000
Max.System pressure		Mpa	24	22	24	25	25	27	25
Stroke of movable working table		mm	160	150	150	150	150	150	150
Opening height		mm	370	380	380	450	500	550	800
Height of working platform from ground		mm	950	1050	1080	1185	1365	1500	2100
Upward speed of movabale working table		mm/s	120	90	80	80	80	70	82
Returning speed of movabale working table		mm/s	110	105	90	80	80	80	92
Movable working table size	L-R between column	mm/s	420	520	580	710	900	1100	1400
Movable working table size	F-B Rim	mm/s	420	500	540	640	880	1050	1380
Overall dimension	L-R	mm	1050	1130	1200	1440	1640	200	2505
	F-B	mm	1080	1040	1165	1370	1860	2090	2545
	H	mm	1790	1840	1895	2080	2500	2835	3860
Motor power		KW	5.5	5.5	7.5	15	22	22	30
Weight (Approx.)		Kgs	1650	2400	3300	5500	9800	20000	42000

Feature

1. The frame structure of Hydraulic press for minting is designed by mechanical analysis, welded with high quality steel material, with good overall rigidity and high compressive strength.

2. Quickly lowering the cylinder to set up the upper pressure type hydraulic cylinder, with high flat temperature.

3. Pressure, stroke, holding pressure, etc. can be adjusted according to the requirements of the pressing process.

4. CDOCAST Hydraulic press for minting comes with Infrared protection, safer operation.

FAQ

Q1: Your Hydraulic Presses range from 100 to 1000 Ton. How do I select the right one for my production?

A: Selecting the correct press tonnage is critical for quality and efficiency. We recommend the optimal model based on a thorough analysis of three key factors: the raw material of your product, the final product dimensions, and the intricacy of the design/pattern to be stamped. This ensures you get a press that delivers flawless results without under or over-investing.

Q2: In a Coin Minting Line, there is both a Hydraulic Punching and a Hydraulic Press Machine. Can one machine replace both?

A: Generally, we do not recommend combining these functions into a single machine. The primary reasons are:

*Different Dies & Process: Each process requires dedicated dies, and frequent die changes in production are impractical and inefficient.

*Different Technical Requirements:

The Hydraulic Punching Machine requires an extreme, instantaneous impact force with a very short stroke. It operates like a paper hole puncher, demanding “speed, precision, and power,” with high requirements for machine rigidity and the hydraulic system’s burst pressure.

The Hydraulic Stamping Machine requires stable, continuous, and uniform pressure, often with a pressure-holding function. It works like a precision printing press, needing even pressure across the entire mold to ensure sharp, consistent, and deep-struck details. It demands extremely high precision and stability in pressure control.

Q3: What is the difference between a Servo Motor-driven Hydraulic Press and a Standard Motor-driven one?

A: The servo motor drive offers significant advantages:

*Energy Efficiency & Noise: Servo-driven presses are remarkably quieter and more energy-efficient, creating a better working environment and reducing operating costs.

*Precision Control: The servo motor allows for infinite and highly precise pressure adjustments, whereas standard motors have limited control. For products like 1g-200g gold bars, where exquisite detail is critical, we strongly recommend a servo-driven press for its superior pressure precision.

Q4: What is the difference between a Frame Type (C-Type) and a Four-Column Hydraulic Press?

A: Both have their merits for specific applications:

*Four-Column Press: Offers superior structural stability and excellent pressure distribution, making it ideal for high-precision tasks. It typically comes at a higher price point.

*Frame Press (C-Type): A robust and cost-effective solution for many applications.

We will recommend the most suitable structure based on your specific product and technical process requirements.

Q5: If I produce gold bars from 1g to 500g, can one COINING PRESS MACHINE handle all weights?

A: We do not recommend using a single press for such a wide weight range. Here’s why:

*Initial Pressure: Every press has a minimum initial pressure (e.g., 50 Ton for a 300T press). A 1g bar may only require 10 Ton, meaning the machine’s minimum is still excessive, leading to premature mold wear and damage over time.

*Energy Efficiency: Using a large-capacity press for small products is highly inefficient. The energy consumption (electricity/hydraulic oil) is significantly higher than using a appropriately sized machine, leading to substantial long-term operational waste.

Q6: Why do your minting line presses come with upper and lower bolster plates?

A: The bolster plates are a critical protective feature. During long-term operation, the press’s bed and slide can develop minor deformations. These installed bolster plates absorb this wear, protecting the main machine’s critical surfaces from damage and ensuring long-term accuracy.

Q7: Why is a sub-Die holder (die set) necessary for the press?

A: The sub-Die holder is essential for safety, efficiency, and quality:

*Pressure Distribution: It helps distribute pressure evenly, which is crucial when using small molds for lightweight bars on a larger press.

*Integrated Ejection System: Our bolster plates and sub-mold holders are designed together with an **automatic ejection system**, making production safer and more efficient.

*Safety & Durability: In case of operator error causing excessive pressure and mold breakage, the sub-mold holder contains the fractured pieces, preventing injury and equipment damage. This also reduces downtime. Furthermore, it supports the mold structure, enhancing rigidity and prolonging the overall mold life.

Q8: Is a water chiller necessary for the hydraulic press?

A: A water chiller is only necessary if your operation involves continuous, uninterrupted work cycles exceeding 10 hours. For standard shift operations, the built-in cooling system is sufficient.

Q9: Can we purchase your automatic ejection sub-mold holder for our existing press?

A: This is generally not feasible. The installation height and stroke of the ejection system must be precisely matched to your press’s shut-off height. A mismatch will prevent the automatic ejection from functioning and could lead to severe equipment damage or safety hazards.

Q10: Why are light curtains important on a hydraulic press?

A: Light curtains are a vital operator safety feature. They create an invisible infrared barrier around the pressing area. If a worker’s hand breaks this light beam during operation, the press will immediately stop, preventing potential accidents and ensuring a safe working environment.

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Heat Treatment Equipment for Precious Metals

Wax Burnout Oven

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[what is wax burnout oven]

The Wax Burnout Oven is used for melting and flowing the wax in the plaster mold and a hollow plaster mold is obtained in the process of jewelry casting.

A special secondary combustion design recollects the part of the dewaxing process that is not fully burned and re-burns fully to minimize the wax smell in the environment.

The Oven adopts a stainless steel shell, which is more durable than an iron shell and has better anti-corrosion performance. It uses high temperature resistant and wear-resistant bricks as thermal insulation bricks to ensure stable temperature.

Also, the Burnout Oven is easy to operate and adopts imported heating wire. When replacing the heating wire, there is no need to disassemble the refractory plate, and it can be replaced directly.

The oven has high safety performance. When the furnace door is opened, it will automatically cut off the power to ensure the safety of the operator.

Machine Pictures

Parameter

Model number	CDO-WF2	CDO-WF4	CDO-WF6	CDO-WF9	CDO-WF12	CDO-WF18	CDO-WF24	CDO-WF32
Power source	220V, 1P	220V, 1P	220V, 1P	220V, 1P	380V, 3P, 50/60Hz	380V, 3P, 50/60Hz	380V, 3P, 50/60Hz	380V, 3P, 50/60Hz
Power	2.5kw	3kw	6kw	6kw	7.5kw	7.5kw	9kw	12kw
Capacity	2 pcs 4*9" flask	4 pcs 4*9" flask	6 pcs 4*9" flask	9 pcs 4*9" flask	12 pcs 4*9" flask	18 pcs 4*9" flask	24 pcs 4*9" flask	32 pcs 4*9" flask
Max temperature	1000℃	1000℃	1000℃	1000℃	1000℃	1000℃	1000℃	1000℃
Chamber size	300150300 mm	310310350 mm	440310350 mm	440440350 mm	440310570mm	440460570 mm	580460570 mm	600600570 mm
Dimension	470750940 mm	620750940 mm	620890980 mm	740880970 mm	6209001080 mm	7609001080 mm	10207701100 mm	10309001100 mm
Weight	81KG	103KG	136KG	150KG	165KG	179KG	186KG	200KG

Feature

Features of the wax burnout oven

1Wax burnout oven is specially designed for secondary combustion, it recollects the incomplete part of the dewaxing process and re-burns it to fully burn and minimize the wax smell in the environment.

2Full automatic temperature control with over-temperature protection and break-even protection to prevent the stove from burning out of control and causing fire hazards.
3：. Proven intermittent power failure function to control the heating speed, to ensure the quality of plaster type sintering and improve the output rate of castings.
4. The heating element design layout is reasonable, the temperature inside the furnace is even, air convection is favorable to the evaporation and discharge of water after heating of wet workpiece, which improves the service life of heating element.
5 The furnace door is equipped with a safety device, when the door is opened, the door automatically closes to ensure the safety of the operator.
6The furnace is made of new high temperature resistant and light weight material, which has the characteristics of high efficiency, energy saving and environmental protection.

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Heat Treatment Equipment for Precious Metals

Rotary burnout oven

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[what is rotary burnout oven]

Wax rotary burnout oven is used for melting and flowing the wax in the plaster mold and a hollow plaster mold is obtained in the process of jewelry casting.
Special design for two-time burning; it will re-collect those not fully burnt during the dewaxing process and let them be burnt again for full combustion, and reducing the wax flavor in the environment as much as possible.

Machine Pictures

Parameter

Model	CDO-RB20
Voltage	3-phase 380V, 50/60 Hz
Power	20 KW
Max temperature	1000 °C
Working size	700 * 700 * 700mm
Flask quantity	32 pcs of 4*10 inch flask
Max height of the flask	11 inch (280mm)
Number of heating layers	2 layers
PLC touch screen	Equipped
Temperature control	Equipped
Outer dimensions	1300 * 1100 * 2200mm
Weight	About 800 kg

Feature

Feature:

1: CDOCAST burnout oven burning temperature is unformed and the temperature accuracy can be 2 degree with the temperature displace can be 0-1200C.

2: Max burning temperature is 900 Degree, and come with the temperature protection system, once the temperature is over than the set temperature, the power supply will be cut automatically, so can guarantee the machine and the castings can be well protect from damage.

3: Designed With second burning function, can Re-burning the exhaust gas in the furnace, Minimize air pollution and is an extremely environmentally friendly device.

4: Built-in two-layer rotating turntable, it can hold 40pcs 4*8 flask, and the single-layer load is about 50Kg, which is very suitable for large-scale jewelry manufacturers.

5: Rotate burnout oven comes with Touch screen editable program system design , with running data logging function, can store data running continuously for 30 days, support U disk CSV export data record file.

FAQ

Q1. What are the working dimensions of this rotary burnout oven? Is customization supported?

A: The internal standard dimensions of this rotary oven are 700mm (W) x 700mm (D) x 700mm (H). Yes, we support size customization based on your production needs.

Q2. How many flasks can this rotary burnout oven load at one time?

A: The standard-sized rotary oven is equipped with 2 layers of rotating trays. With reasonable layout, it can simultaneously load up to 36 pcs of standard φ4 x 11-inch flasks, making it ideal for centralized dewaxing and firing of small to medium batch jewelry casting.

Q3. What is the maximum working temperature this rotary burnout oven can reach?

A: The maximum design temperature of this equipment can reach 1000°C, fully meeting the requirements for complete dewaxing and high-temperature firing of plaster molds for various precious metal casting. It is equipped with a temperature protection system; once the temperature exceeds the set point, the power will automatically cut off, ensuring the machine and castings are not damaged.

Q4. What is the heating method and working principle of this rotary burnout oven?

A: This rotary oven uses electric resistance heating. The furnace chamber is lined with heating elements on three sides to ensure even heating.
Working Principle: It provides precise temperature control through multi-zone electric radiant heating while driving the loaded part carrier to rotate at a constant speed, achieving dynamic and uniform heating of the parts. The melted wax flows smoothly out of the oven through a dedicated wax channel, preventing mold shell cracking due to wax expansion.

Q5. Is the rotation speed of the turntable adjustable during the dewaxing process?

A: Yes, the rotation speed is adjustable. The equipment is equipped with a speed-controllable rotation mechanism. Users can set the optimal rotation speed according to the size of different molds, wax characteristics, and process stages (e.g., low speed for dewaxing, medium to high speed for firing).

Q6. What are the main advantages of a rotary burnout oven compared to traditional static burnout ovens?

A: The main advantages lie in the process improvements brought by the rotation function:

• More Thorough and Safer Dewaxing: The centrifugal force generated by rotation effectively guides the melted wax to flow smoothly out of the flasks, significantly reducing the risk of mold cracking caused by thermal expansion of the wax.

• More Uniform Heating: Rotation ensures all sides of the flasks and molds are heated evenly, avoiding local hotspots or insufficient heating, resulting in mold shells with stable quality.

• Improved Efficiency and Consistency: Capable of processing a large number of molds at once with high process controllability, making it very suitable for standardized production.

Q7. Is your rotary oven easy to operate? Are there any other special designs?

A: Our rotary oven adopts PLC touchscreen control system, allowing customers to freely set parameters such as heating temperature and time, enabling automated operation. It features operation data logging, supporting continuous storage of run data and export of data log files. It is also designed with a secondary combustion function that re-burns exhaust gases inside the furnace, minimizing air pollution and making it an extremely environmentally friendly device.

Q8. What materials are the furnace chamber and rotation mechanism made of?

A: The furnace chamber is constructed from high-performance refractory ceramic fiber, offering good insulation and fast heating. The core rotating components are made of 310S stainless steel, ensuring long-term stable operation under high temperature and high load conditions.

Q9. What are the common process issues with the rotary burnout oven and their solutions?

A: The main common issues are:

• Mold Shell Cracking or Swelling: Usually caused by too rapid heating during the dewaxing stage. The solution is to use a gentler, low-temperature dewaxing curve and ensure the rotation function is properly activated.

• Castings with Porosity or Incomplete Metal Fill: This may be due to insufficient firing temperature or time, leaving the mold shell incompletely sintered or containing residual moisture. Check and ensure adequate firing temperature and holding time are reached.

• Residual Wax Ash After Dewaxing: Final firing temperature or time is insufficient. The temperature in the final firing stage should be increased and the holding time appropriately extended.

Q10. How is the daily maintenance and upkeep of the equipment performed?

A: You can follow the following suggestions for maintenance:

• Regular Cleaning: Clean up wax drips and other debris inside the furnace chamber promptly after it has cooled down.

• Inspect the Rotation Mechanism: Periodically check if the fixing screws of the rotating rack are loose, if the bearings operate smoothly, and add high-temperature lubricant as required.

• Clean Internal Dust: Due to prolonged use and environmental factors, dust may accumulate inside the machine and on the mainboard. Regularly use compressed air to clean the mainboard and internal dust. (Perform this only 30 minutes after turning off the main power switch to avoid electric shock hazard.)

• Check Seals and Heating Elements: Observe if the furnace door seal is intact. Check heating elements (e.g., silicon carbide rods, resistance wires) for signs of aging or damage.

• Exhaust System: Regularly check that the exhaust pipes are clear and unobstructed.

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Metal Forming Machine

Tube Necking Machine

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[ Tube Necking Machine]

CDOCAST state-of-the-art Tube Necking Machine is engineered to deliver unparalleled accuracy and efficiency in reducing the diameter of tube ends. Designed for demanding precious metal & industrial applications, this robust machine is the cornerstone for creating secure, leak-proof connections in tubing systems across diverse sectors.

This Tube Necking Machine is exclusively designed for precision necking processing of precious metal hollow tube ends (Ø2-12mm), including gold, silver, copper, etc. Utilizing cold forging technology, it reduces tube end diameters by 15%-30% to form standardized tapered lead-in ends. These precisely shaped ends directly interface with rolling mill grooves or drawing dies, effectively eliminating feeding jams and end deformation caused by the soft nature of precious metal thin-walled tubes. This ensures continuous, high-efficiency operation of subsequent rolling/drawing processes.

Tube necking machine is a device for processing metal tube ends. It achieves plastic deformation through radial compression, reducing tube diameter while increasing wall thickness. Its operating principle is based on foundational theories of metal plasticity: The hydraulic system actuates dies to apply radial pressure on the tube end, causing axial material flow that completes the necking formation.

Machine Details

Tube Necking Machine

Parameter

Model number	CDO-TN1
Voltage	380V, 3 Phase, 50Hz
Motor power	3KW
Max. Diameter	Ф12mm
Min. Diameter	Ф2mm
Necking Ratio	≤50%
Die Material	D2 HRC60-62
Die Length	100mm
Lubrication System	Three-phase Electric Pump
Size	730x480x1050mm
Weight	350kg

Feature

Tube Necking Machine Feature:

1. Exceptional Precision & Consistency: Achieves tight tolerances on neck diameter, length, angle, and concentricity, critical for leak-proof fittings and assembly reliability. Batch-to-batch consistency is guaranteed.

2. Superior Surface Finish: Cold-forming process produces a smooth, work-hardened surface on the necked area, enhancing fatigue life and seal integrity. Minimizes the need for secondary finishing.

3. High Production Efficiency: Fast cycle times, easy setup (especially with quick-change tooling), and potential for automation integration (auto-load/unload) significantly boost throughput.

4. Zero Material Loss Processing: 99.8% material utilization via chip-free cold forming, Surface integrity maintained.

5. Versatility: Capable of necking a wide range of tube materials (gold, silver, copper, brass etc) and diameters (specify your typical range φ2-12mm) with appropriate tooling.

6. Reduced Secondary Operations: Produces a ready-to-assembly tube end, often eliminating the need for additional swaging, flaring (in some cases), or extensive cleaning.

7. Operator-Friendly: Intuitive controls, clear setup procedures, and accessible tooling changes minimize training time and operator error.

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Auxiliary Facilities

Jewelry Polishing Machine

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1Product Details1

[Jewelry Polishing Machine]

CDOCAST Jewelry Polishing Machine is specifically designed for processing various metals (gold, silver, copper, etc.) and hard synthetic materials, meeting polishing demands across multiple industries. Polishing Machine delivers highly efficient surface finishing for metals, imparting exceptional surface smoothness to precious metals, jewelry, and precision components.

In jewelry manufacturing, surface polishing directly determines product aesthetics and commercial value. Traditional manual polishing is inefficient, inconsistent, and struggles with complex geometries. CDOCAST introduces multiple intelligent systems — Vibration Polishing Machine, Centrifugal Polishing Machine, Dry/Wet Eddy Current Grinding Polishing Machine, etc — engineered to overcome industry challenges and elevate your productivity!

① Vibration Polishing Machine (Master of Complex Structures): It is designed for porous, hollow, and intricate jewelry, solving polishing challenges in hard-to-reach areas like earring backs, chain links, and relief details. Ideal for:

Materials: Silver, K-gold, copper alloys, plated accessories
Workpieces: Beads, pendants, filigree, perforated clasps
Objectives: Deburring, scratch removal, matte-to-mirror finishes

② Centrifugal Polishing Machine (High-Speed Expert for Precision Parts): Optimized for ultra-smooth, mirror finishes on high-value micro-components:

Critical Workpieces: Prong settings, micro-clasps, precious metal fittings
Objective: Achieve Ra≤0.1μm super-mirror finishes for enhanced gem reflection.

③ Dry/Wet Eddy Current Grinding Polishing Machine (Gentle Solution for Curved Surfaces): Specialized for scratch-sensitive curved jewelry, preserving plated/enamel finishes:

Typical Workpieces: Relief bracelets, enamel pendants, soft silver carvings
Core Value: High gloss + zero scratching for delicate surfaces.

Machine Details

Vibration Polishing Machine

Centrifugal Polishing Machine

Wet Eddy Current Grinding Polishing Machine

Parameter

Vibration Polishing Machine:

Model	CDO-VPM40	CDO-VPM60	CDO-VPM80
Voltage	380V, 3 Phase, 50Hz	380V, 3 Phase, 50Hz	380V, 3 Phase, 50Hz
Power	550W	750W	750W
Capacity	40L	60L	80L
Rotation rate	1450R/Min	1450R/Min	1450R/Min
Size	φ50x62mm	φ64x62mm	φ80x75mm
Weight	50kg	85kg	100kg

Centrifugal Polishing Machine:

Model	CDO-CPM30	CDO-CPM40	CDO-CPM50
Voltage	380V, 3 Phase, 50Hz	380V, 3 Phase, 50Hz	380V, 3 Phase, 50Hz
Motor power	2.2 KW	2.2 KW	3 KW
Total capacity	30L	40L	50L
Polishing tank capacity	4*7.5L	4*10L	8*6.2L
Polishing tank size	φ175**275mm	φ175*355mm	φ175*235mm
Rotation rate	1800 rpm	1800 rpm	1800 rpm
Outer Dimensions	10809601400mm	11809601400mm	12809601400mm
Weight	600kg	650kg	720kg

Wet Eddy Current Grinding Polishing Machine:

Model	CDO-GPM18-1	CDO-GPM18-2	CDO-GPM18-3	CDO-GPM36-1	CDO-GPM36-2	CDO-GPM36-3
Voltage	220V, 1 Phase, 50Hz	220V, 1 Phase, 50Hz	220V, 1 Phase, 50Hz	380V, 3 Phase, 50Hz	380V, 3 Phase, 50Hz	380V, 3 Phase, 50Hz
Motor power	0.75 KW	2*0.75 KW	3*0.75 KW	2.2 KW	2*2.2 KW	3*2.2 KW
Rated volume	18L	2*18L	3*18L	36L	2*36L	3*36L
Working volume	14L	2*14L	3*14L	28L	2*28L	3*28L
Outer Dimensions	690×850×1440mm	1170×850×1440mm	1680×850×1440mm	880×780×1440mm	1480×780×1440mm	2120×780×1440mm
Weight	140kg	235kg	330kg	220kg	370kg	530kg

Feature

Jewelry Polishing Machine Feature:

1. CDOCAST jewelry polishing machine is suitable for polishing various metals (gold, silver, copper, etc.) and hard synthetic materials.

2. Completely eliminating the reliance on traditional manual polishing, CDOCAST jewelry polishing machine has achieved full process automation, reducing labor costs.

3. The jewelry polishing machine has versatile surface treatment capabilities, such as efficient deburring, deep cleaning, gloss enhancement, and edge passivation.

4. The polishing process can achieve non-destructive fine processing, and gentle vibration can avoid deformation of thin-walled/precision parts.

5. Improved Workflow – makes polishing easier and makes it possible to manage workflow more effectively.

6. Excellent production efficiency – with a single processing capacity of tens of kilograms, the efficiency is 20 times higher than manual polishing.

7. Our jewelry polishing machine is easy to operate, low maintenance, and has super economy, reducing labor costs.

8. The jewelry polishing machine is perfectly adapted to various industries, such as jewelry, hardware tools, medical equipment, electronic components, automotive parts, and more.

Catalog

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Metal Forming Machine

Hollow Tube Forming Machine

1Finished Products1

1Product Details1

[Hollow Tube Forming Machine]

CDOCAST Hollow tube forming machine is an advanced automatic solution designed for producing high-quality metal hollow tubes from strips, supporting various diameters and thicknesses. It is compatible with soft metals such as gold, K gold, silver, and copper, and features an integrated argon welding system for seamless forming and welding. The innovative double-line design enables the simultaneous production of tubes in two different diameters, streamlining subsequent processing. With motorized variable speed control, this machine is ideal for jewelry manufacturing and other precision metalworking applications.

Our Hollow tube forming machine is designed to enable you to simply and effectively produce tubes of various shapes and sizes. Utilizing continuous roll forming combined with high-frequency welding technology, it processes metal strips such as gold, silver, and copper into precision hollow tubes. It achieves one-stop production from coil material to finished tubes, making it particularly well-suited for high-end applications like precious metal thin-walled tubes and capillary tubes.

One key advantage of the hollow tube forming machine is that it enhances productivity and reduces costs. It can manufacture numerous metal tubes much faster than older methods. Furthermore, the machine provides a high degree of precision and accuracy, ensuring each tube produced meets the necessary standards. By efficiently cutting and forming the metal, the machine maximizes the utilization of raw materials. This minimizes waste and reduces expenses.

Machine Details

Hollow Tube Forming Machine

Parameter

Model	CDO-TF01	CDO-TF02
Voltage	380V, 3 Phase, 50Hz	380V, 3 Phase, 50Hz
Motor Power	1.5KW	1.5KW
Tube Die Size	Ф4-11.5mm	Ф4-11.5mm
Tube Die Amount	Customized 1 Set	Customized 2 Set
Tube Die Hardness	HRC 52	HRC 52
Die Speed	17r/min	17r/min
Argon Welder	220V-200A-1 Set	220V-200A-2 Set
Size	1230x510x1160mm	1500x746x1650mm
Weight	400kg	600kg

Feature

Hollow Tube Forming Machine Feature:

1. CDOCAST Hollow tube forming machine can process metal strips such as gold, silver, and copper, and the output diameter can be customized. Specially suitable for high-end manufacturing fields such as jewelry precision capillary tubes, building decoration tubes, and HVAC system tubes.

2. Integrating four core modules: continuous roll forming, high-frequency welding (10-100kHz), online sizing, and chip-free cutting, a single machine completes the complete process from coil to finished pipe.

3. Revolutionary production efficiency and precision, with production speed reaching 350% of traditional equipment and material utilization rate exceeding 99.3%.

4. The weld strength reaches 98% of the base material (argon gas shielded welding), which can achieve perfect seamless welding.

5. By efficiently cutting and forming metals, CDOCAST hollow tube forming machine can maximize the use of raw materials, minimize waste, and minimize costs.

Catalog

Product Catalog

Metal Forming Machine

Hollow Ball Making Machine

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1Product Details1

[Hollow Ball Making Machine]

CDOCAST Hollow Ball Making Machine is suitable for making different shapes & sizes and materials of hollow balls, such as gold, karat gold, silver, and copper, etc.

In the realm of precision and efficiency-driven metal processing, CDOCAST Hollow Bead Making Machine is your ideal solution for the batch production of high-quality hollow metal spheres. Specifically designed to meet the demands of the jewelry manufacturing, hardware components, decorative items, and other precision metal processing industries, it rapidly and accurately transforms hollow tubes into hollow balls with diverse geometries and uniform dimensions.

Hollow ball making machine adopts advanced automated design, simplifying the complex ball making process into efficient and smooth automatic operations:

1. Feeding: The Metal tube is precisely fed into the processing area.

2. Precision Stamping: The tube is stamped using precision dies to form the basic contour of the sphere.

3. Automatic Folding & Forming: In this critical stage, the equipment automatically performs precision folding and closure of the stamped metal, forming a seamless hollow structure.

Machine Details

Hollow Ball Making Machine

*Click to check the detailed production line video

Parameter

Model	CDO-HBM1	CDO-HBM2
Voltage	380V, 3 Phase, 50Hz	380V, 3 Phase, 50Hz
Motor Power	3KW	3KW
Bead Diameter	Ф2-6mm	Ф6-10mm
Bead Making Speed	3400 Beads/Hour	3400 Beads/Hour
Size	650x600x1230mm	650x600x1230mm
Weight	600kg	600kg

Feature

Hollow Ball Making Machine Feature:

1. Wide material applicability: CDOCAST hollow ball making machine can efficiently process various commonly used metal sheets such as gold (pure gold, K gold), silver, copper, etc.

2. Diversified sphere production: Easily manufacture hollow spheres in various shapes, including standard spheres (round spheres), rugby balls (oval spheres), teardrop spheres, abacus beads, and other customized-shaped balls.

3. Precision size range: Hollow ball making machine can stably produce hollow balls with diameters ranging from 2mm to 10mm, meeting the precise requirements of different application scenarios.

4. Industry applications: Widely used in jewelry (such as bead chains, pendants, decorative elements), hardware accessories (such as handles, decorative buckles), handicrafts, clothing accessories and other fields.

5. Easy and efficient operation: With automated process design, operators mainly undertake simple tasks such as loading, monitoring, and receiving materials. The learning curve is short, saving the cost of hiring physical labor.

6. Stable, reliable and durable: The sturdy mechanical structure and high-quality core components ensure the stability and durability of the equipment under long-term continuous operation.

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Hydraulic Minting Press

Hydraulic Logo Stamping Machine

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1Product Details1

CDOCAST Compact Four-Column Hydraulic Press for Precious Metal Stamping

CDOCAST’s compact four-column hydraulic press is engineered for the precious metals industry. Designed for stamping marks and logos onto gold bars, silver bars, platinum ingots, and more, this machine guarantees flawless branding that enhances product value and strengthens your brand identity. It is the ideal stamping solution for both small workshops and large-scale precious metal processing plants.

High-Precision Pressure Control
Achieve perfectly consistent marks on precious metals of any hardness. Our advanced pressure regulation system allows for precise adjustments in increments as fine as 0.1 tons, ensuring every impression is sharp and clear.

Long-Lasting Alloy Molds
Each press comes standard with high-hardness alloy steel molds. Through specialized heat treatment and surface hardening processes, our dies are built for endurance, standing up to high-frequency use without compromising on stamp quality.

Quick-Die-Change System
Maximize your productivity with our tool-free, modular die installation. Changeover time is reduced to under one minute, allowing for flexible switching between multiple dies to meet diverse production demands.

Adjustable Stamping Speed
Tailor the machine’s cycling speed to your output requirements. This adjustable feature provides the flexibility to prioritize either high-volume production or meticulous, deliberate stamping, making it a versatile asset for any production schedule.

Intelligent Safety Protection
Operate with complete peace of mind. The press is equipped with an automatic overload protection system, two-hand operation buttons, and an emergency stop switch, ensuring a secure working environment.

Energy Efficient & Low Noise
Our high-efficiency motor reduces energy consumption by up to 20%. Combined with a remarkably quiet operation of under 75 dB, this press is as environmentally friendly as it is cost-effective.

Machine Details

100 ton Mini Logo Stamping Machine

Please click here to watch video

300 ton Mini Logo Stamping Machine

Small Logo Stamping Machine

Parameter

Model		Unit	CDO-100S1	CDO-200S1	CDO-300S1
Rated capacity		Ton	100	200	300
Max.System pressure		Mpa	63	63	63
Stroke of movable working table		mm	100	100	100
Opening height		mm	190	250	300
Height of working platform from ground		mm	890	1050	1020
Upward speed of movabale working table		mm/s	5	5	5
Returning speed of movabale working table		mm/s	2	3	5
Movable working table size	L-R between column	mm/s	220	230	250
Movable working table size	F-B Rim	mm/s	220	230	160
Overall dimension	L-R	mm	500	520	580
	F-B	mm	500	520	860
	H	mm	1200	1470	1500
Motor power		KW	0.75	1.5	3
Weight (Approx.)		Kgs	320	460	820

Bar Casting Line

Gold Silver Bar Casting Line

Feature

Purpose-Built for Gold: Designed specifically for stamping characters and logos onto gold bars, ensuring clean and permanent marks.
Simple & Space-Saving: Features a simple structure and compact design, making it an easy-to-operate and space-efficient solution for any workshop.
Affordable Power: A highly cost-effective press that delivers immense value, generating tens of tons of pressure for high-quality results.
Ideal for Small Batch Production: Perfectly suited for small studios and factories looking for a reliable, low-maintenance stamping solution.
Streamlined Operation: The process is simplified and typically requires no additional pad formwork, getting you from setup to production in no time.

Catalog

Product Catalog

Rolling Mills

Metal Strips Rolling Mill

1Finished Products1

1Product Details1

What is a Metal Strip Rolling Mill?

A metal strip rolling mill is a critical piece of industrial equipment, playing a central role in the precious metals and general metalworking industries. It processes metal strips—such as gold, silver, and copper—by passing them between one or more pairs of rotating rollers that apply precisely controlled pressure. This process induces planned plastic deformation, shaping the metal into precise strips, foils, or semi-finished products with specific thicknesses, widths, and surface finishes. This system is key to achieving high-precision, high-efficiency metal forming, directly determining the quality and consistency of the final product.

Core Working Principle: Precision Deformation Under Pressure

The fundamental principle of a strip rolling mill is **plastic deformation**. The drive system rotates the high-strength rolls in opposite directions, and the metal strip is fed into the gap between them. The mill applies immense vertical pressure—far exceeding the metal’s yield strength at room or elevated temperatures—through a hydraulic or mechanical system. This force causes the metal’s atomic lattice to slip, resulting in uniform thinning of its thickness, elongation in length, and a smooth surface finish. The entire process can be managed by an advanced CNC system that provides closed-loop control over pressure, speed, and tension, ensuring precise and stable deformation.

Key Components and Their Functions

A high-performance metal rolling mill is a perfect integration of precision machinery and intelligent control, consisting of the following main components:

• Rolls: The core tools for deformation, directly determining product accuracy and surface quality. They are typically manufactured from ultra-high-strength, wear-resistant alloy materials like Cr12MoV, DC53, or Tungsten Steel, and undergo precision grinding and heat treatment to ensure long-term stability under high pressure and abrasive conditions.

• Frame: Acting as the “skeleton” of the entire machine, the frame is usually constructed from heavy-duty cast steel or welded steel plates, stress-relieved for stability. Its primary function is to provide the rigidity and strength needed to withstand enormous rolling forces, preventing any frame deflection from compromising rolling accuracy.

• Drive System: The “heart” of the mill, providing smooth and powerful rotational force to the rolls. This system typically includes high-performance motors, reduction gearboxes, and couplings, ensuring the rolls maintain constant torque at preset speeds for smooth startup and braking.

• Control System: The “brain” of the operation. Modern mills commonly use an automated control system combining a PLC (Programmable Logic Controller) with an HMI (Human-Machine Interface). Operators can use it to precisely set and monitor key parameters like working speed, rolling pressure, forward/reverse operation, and coiling tension, guaranteeing an automated and repeatable production process.

Industry Applications and Value

In the precious metals sector, the metal strip rolling mill is indispensable. It is used to roll cast gold and silver ingots into standard-thickness investment bars or thin sheets, and further into ultra-thin foils for applications in electronic circuits, decorative materials, and high-end crafts. Its value lies in its ability to produce high-quality products with precise dimensions, bright surfaces, and dense microstructure, all while offering high material utilization and mass-production capabilities, significantly enhancing the added value and brand image of precious metal products.

[The comparance of roller material ]

	Cr12MoV	DC53	Tungsten
Hardness	HRC 58-62	HRC 60-64	HRA 88-93
Wear life	1X	1.3-1.5X	5-8X
Impact resistance	★★☆	★★★★	★★☆
High temperature resistance	≤300℃	≤400℃	≤800℃
Cost	Low	Medium	High

→The comparison of roller material

Machine Details

Metal Strips Rolling Mill

Click to watch the video

Metal Strips Rolling Mill Details

Parameter

Model	CDO-RM5.5	CDO-RM7.5	CDO-RM10	CDO-RM15	CDO-RM20
Motor	4kW	5.5kW	7.5kW	11kW	15kW
Voltage	380V, 3P, 50/60Hz	380V, 3P, 50/60Hz	380V, 3P, 50/60Hz	380V, 3P, 50/60Hz	380V, 3P, 50/60Hz
Roller Speed	9.4m/min	11.4m/min	13.1m/min	15.6m/min	13.4m/min
Output Thickness	25-0.1 mm	25-0.1mm	30-0.1 mm	30-0.1mm	45-0.15 mm
Roller Material	Cr12MoV	Cr12MoV	Cr12MoV	Cr12MoV	Cr12MoV
Roller Hardness	HRC 60-62	HRC 60-62	HRC 60-62	HRC 60-62	HRC 60-62
Roller Size	Φ108x180mm	Φ132x180mm	Φ151x180mm/Φ151×250mm	Φ180x250mm	Φ200x250mm
Lubrication System	Bearing Bush Grease Lubricated	Bearing Bush Grease Lubricated	Bearing Bush Grease Lubricated	Bearing Bush Grease Lubricated	Bearing Bush Grease Lubricated
Weight	600kg	950kg	1200kg	1700kg	3000kg
Size(LxWxH)	1200x640x1370mm	1340x750x1420mm	1430x760x1500mm	1530x840x1600mm	1740x900x1700mm
Roller material can be upgraded to DC53 or Tungsten

Feature

1: Use the high grade rollers to ensure the quality and stability of the machine.

2: The machine structure is heavy and stable, and the safety of operation is greatly improved.

3: Unique design dramatically improves the precision of binding.

4: Rolling different precious metals without loss.

5: The rolling mill can be customized according to customer needs.

6: The combination of multiple drivers and different drive structures has a moderate speed and can prevent interference.

Main Function

Key Functions of a Metal Strip Rolling Mill

A metal strip rolling mill is far more than just a shaping tool; it is a transformative piece of industrial technology that enhances the very properties of metal. Its core functions deliver critical benefits for modern manufacturing:

1. Reshape and Resize Metal with Precision
The primary function of a rolling mill is to transform raw metal inputs—such as ingots and billets—into highly usable forms. This includes the production of precise sheets, strips, bars, and wires, all tailored to specific dimensional tolerances for downstream applications.

2. Enhance Material Properties and Performance
Rolling does more than change shape; it improves the metal’s internal structure and external qualities.

Grain Refinement: The process of compression breaks down and refines the metal’s internal grain structure. This can lead to significant improvements in key mechanical properties, such as strength and hardness (a phenomenon known as work hardening).
Hot vs. Cold Rolling Benefits:

Hot Rolling is highly effective for eliminating internal casting defects, creating a more uniform and ductile microstructure.
Cold Rolling is renowned for producing superior surface finish, tighter dimensional accuracy, and increased strength through strain hardening.
3. Maximize Production Efficiency and Output
Modern rolling mills are engineered for high-volume manufacturing. Continuous and semi-continuous rolling processes enable mass production at high speeds, reliably meeting the large-scale demands of global industries.

4. Achieve Energy Efficiency and Reduce Waste
Compared to subtractive methods like machining or cutting, rolling is a highly efficient forming process. It significantly reduces material waste (minimizing scrap) and generally consumes less energy per unit of output, contributing to more sustainable and cost-effective production

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Product Catalog

Rollers directly determine product quality and production efficiency. Choosing the right roll material, maintenance, and supporting processes are key to improving rolling mill performance!

The operation panel controls the working of the rolling mill.

The adjusting wheel is used to adjust the position of the roller.