The ZG-HF Series is a water-cooled high frequency induction heater designed for fast, localized and repeatable heating of electrically conductive metal parts. Seven models are available with rated output from 15 kW to 100 kW and model-dependent operating frequencies from 30 kHz to 150 kHz.
The system can be configured for rod and bolt heating, surface hardening, brazing, annealing, shrink fitting and small-batch metal heating. Constant-current and constant-power control, adjustable heating and holding times, replaceable induction coils and a 100% duty-cycle design support both manual operation and continuous industrial production.
Powered by the esteemed Siemens MOSFET/IGBT module, this induction annealing machine boasts a distinctive inverter technology. With a 100% duty cycle design and the capability for 24-hour operation at maximum power, reliability is etched into every aspect of its performance.
1. Heat treatment of various hardware tools and hand tools, such as pliers, wrenches, screwdrivers, hammers, axes, etc.
2. High-frequency induction heating machine for quenching and hardening processing of various auto parts and motorcycle parts. Such as: crankshaft, connecting rod, piston pin, crank pin, sprocket, camshaft, valve, various rocker arms, rocker arm shaft; various gears in the gearbox, spline shafts, transmission half shafts, various small shafts , All kinds of forks and other high-frequency quenching treatment.
3. High-frequency induction heat treating equipment for hardening processing of gears, shafts, etc. on various power tools.
4. High frequency induction heating quenching of various hydraulic components and pneumatic components. Such as the column of a plunger pump.
5. Quenching treatment of plugs, rotors of rotor pumps; reversing shafts on various valves, gears of gear pumps, etc.
6. Heat treatment of any metal parts, such as various gears, sprockets, various shafts, spline shafts, pins, etc.
7. Quenching treatment of machine tool bed guide rails in the machine tool industry.
Induction Heating for Rods, Bars and Bolts
The ZG-HF Series can be configured as an induction heater for localized heating of steel rods, bars, pins and bolt ends. A work coil is designed according to the rod diameter, heated length and required temperature profile so that heat is concentrated in the specified area.
Typical applications include bolt-end heating before forming, localized rod heating, pin hardening, shaft surface treatment and preheating before assembly. For small-diameter parts or shallow heating requirements, the higher-frequency models provide rapid heat concentration and short cycle times.
For larger bars requiring uniform through-heating, frequency and power must be evaluated carefully. Please provide:
• Material grade
• Rod or bar diameter
• Total and heated length
• Starting and target temperature
• Required heating time
• Hourly production quantity
• Manual, semi-automatic or continuous feeding requirement
Based on these details, we can determine whether a ZG-HF high frequency induction heater or a lower-frequency induction heating system is more suitable.
MAIN FEATURES
High frequency induction heaters use electromagnetic induction to heat metals and other conductive materials quickly and efficiently. This non-contact heating method ensures precise and uniform temperature control, making it suitable for metal hardening, brazing, forging, and heat treatment. By generating heat directly within the material, induction heating minimizes energy consumption, reduces wear and tear on equipment, and provides faster processing times compared to traditional heating methods.
Our range of high frequency induction heating machine offers high performance, reliability, and energy efficiency, designed for both industrial and laboratory use, providing a cost-effective solution for applications requiring rapid and controlled heating.
(1) High frequency induction heating machine 5KW-100KW from Hitfar adopts the world well-known Siemens MOSFET/IGBT mould as power source to devices and unique inverter technology,100% duty cycle design, 24-hour operation at maximum power, high reliability assurance.
(2) self-controlled adjustable heating time, heating power, holding time, holding power and cooling time; greatly mprove the quality and repeatability of heating heating products, to simplify the operation of technical workers.
(3) light weight, small size, simple installation [a few minutes to complete].
(4) simple, few minutes to learn.
(5) Special Security, the output voltage is below 36V, remove the high voltage electric shock.
(6) the heating efficiency up to 95%, energy consumption is only 20% -30% of the old-fashioned tube, almost no lectricity in standby mode, and 24 hours of continuous work.
(7) the sensor can be freely removable quick replacement, ultra-fast heating significantly reduced the oxidation of the workpiece deformation.
(8) substituted oxygen, acetylene, coal and other dangerous items heated latest environmentally friendly products, no open flame to produce more safe and secure.
(9) the induction annealing machine has over-current, over voltage, over temperature, water shortages, lack of equal perfect automatic protection function, and is equipped with self-diagnostic alarm system.
(10) the apparatus includes a constant current and constant power control function, greatly optimize the process of heating the metal to achieve efficient, rapid heating, the superiority of the product can be fully realized.
TECHNICAL PARAMETER
| Model No. | ZG-HF15 | ZG-HF25 | ZG-HF35 | ZG-HF40 | ZG-HF60 | ZG-HF80 | ZG-HF100 |
| Maxi. Oscillating Power | 15KW | 25KW | 35KW | 40KW | 60KW | 80KW | 100KW |
| Oscillating Frequency | 30~150KHz | 30~100KHz | 30-100KHz | 30-80KHz | 30-80KHz | 30-80KHz | 30-50KHz |
| Input Voltage | Single Phase 220V±20% | Three Phases 380V±20% , 415/440/480V can be ordered. |
| Duty Cycle | 100% | 100% 24hour continuously work |
| Input Current Frequency | 50Hz or 60Hz |
| Heating & Retaining Time | 1-99.9 seconds or N |
| Cooling Water Temperature | >5～<50℃ |
| Cooling Water Desire | 0.05~0.2 MPA, 6L/Minute |
| Net. Weight (KGs) | 21 | 18.5 | 18.5 | 29 | 45 | 53 | 55 |
| 13.5 | 15 | 18 | 25 | 35 | 35 |
The working frequency of Hitfar high-frequency induction heating equipment covers 50 kHz ~ 120 kHz. This high-frequency induction heating machine series is used in induction welding, tool welding, pipe welding, thermal nesting, thermal packaging, and other applications.
ZG-HF Configuration and Model Selection
The ZG-HF Series is available in different power and frequency configurations for localized metal heating, brazing, hardening, annealing and related heat-treatment processes. The correct configuration should be selected according to the workpiece and production requirements rather than output power alone.
Important selection factors include:
◆ Workpiece material and electrical properties
◆ Part diameter, wall thickness and total mass
◆ Required heating area and penetration depth
◆ Starting and target temperatures
◆ Required heating cycle and hourly output
◆ Available input voltage and phase
◆ Induction coil geometry and coupling distance
◆ Cooling-water conditions
◆ Manual, remote or automated operation
The actual operating frequency can vary according to the selected model, induction coil and connected load. Customers should provide workpiece drawings, material information and process requirements before confirming the machine and coil configuration.
Advantages of Hitfar High-Frequency Induction Heating Equipment
◆ Adjustable Process Control: Heating power, heating time, holding power and holding time can be adjusted to improve process repeatability.
◆ Continuous Industrial Operation: The ZG-HF Series is designed with a 100% duty cycle for continuous production when the specified power supply and cooling requirements are met.
◆ Constant-Current and Constant-Power Control: Stable output control helps maintain more consistent heating conditions when processing repeat parts.
◆ Remote Control Options: Depending on the selected configuration, remote start/stop and control signals such as on/off, 4–20 mA or 0–10 V can be integrated into the production line.
◆ Equipment Protection: Available protection functions may include overcurrent, overvoltage, overheating and insufficient cooling-water alarms. The exact protection configuration should be confirmed for each model.
◆ Custom and Replaceable Induction Coils: Coils can be designed according to the workpiece shape, heating position and required temperature pattern. Replaceable coils also allow one power supply to support different applications.
◆ Application Evaluation: Workpiece samples or drawings can be evaluated before production to determine suitable power, frequency, heating time and coil structure.
Principle of High-Frequency Induction Heating
A high-frequency induction heater uses an inverter power supply to deliver alternating current to a copper induction coil. The current flowing through the coil creates an alternating magnetic field around the workpiece.
When an electrically conductive metal part is placed inside or near the coil, the magnetic field induces circulating electrical currents, known as eddy currents, within the workpiece. The electrical resistance of the material converts this energy into heat, allowing the metal to be heated directly without contact or an open flame.
The resulting heating pattern depends on several factors, including operating frequency, output power, material properties, coil geometry and the distance between the coil and the workpiece. Higher frequencies generally concentrate heating closer to the surface, while lower frequencies provide greater penetration depth. Therefore, frequency selection must be matched to the workpiece size and required heating depth.
Applications of the ZG-HF High-Frequency Induction Heater
The ZG-HF Series is intended for rapid and controlled heating of electrically conductive metal components. Typical applications include:
◆ Brazing and Soldering: Localized heating of a joint area so that the filler metal flows between the components without unnecessarily heating the entire assembly.
◆ Surface Hardening: Controlled heating of gears, shafts, pins, sprockets and other wear surfaces before quenching.
◆ Localized Heat Treatment: Heating selected areas of metal components for hardening, tempering or stress-relief processes.
◆ Annealing: Controlled heating and cooling of copper, stainless steel and other metal parts to modify hardness, ductility or forming characteristics.
◆ Rod, Bar and Bolt Heating: Localized heating of steel rods, pins, bars and bolt ends before forming, hardening or assembly.
◆ Shrink Fitting: Heating an outer metal component so that it expands for assembly. After cooling, the component contracts and produces a secure interference fit.
◆ Preheating Before Forming or Forging: Rapid heating of small workpieces or selected sections before bending, pressing or forming.
Induction Heating for Rods, Bars and Bolts
The ZG-HF Series can be configured as an induction heater for localized heating of rods, bars, pins and bolt ends. The induction coil is designed according to the workpiece diameter, heated length and required temperature distribution.
It is suitable for applications such as bolt-end heating, localized rod heating, pin hardening, shaft heat treatment and preheating before forming. For larger bars requiring uniform through-heating, power and frequency must be evaluated carefully because higher frequencies generally produce shallower heating penetration.
To evaluate a rod heating application, customers should provide:
◆ Material grade
◆ Rod or bar diameter
◆ Total length and required heated length
◆ Target temperature
◆ Required heating time
◆ Hourly production quantity
◆ Manual or automatic feeding requirements
This information allows the power supply and induction coil to be matched more accurately to the application.
FAQ:
What is high-frequency induction heating?
High-frequency induction heating is a non-contact process used to heat electrically conductive materials. Alternating current flowing through an induction coil creates a magnetic field, which induces eddy currents and generates heat directly within the workpiece.
How does frequency affect induction heating?
Operating frequency affects current concentration and heating penetration. Higher frequencies generally concentrate heat closer to the surface and are suitable for localized heating or surface treatment. Lower frequencies provide deeper penetration and are often more suitable for larger or thicker workpieces.
What is the best frequency for induction heating?
There is no single frequency that is suitable for every application. Frequency should be selected according to the workpiece material, diameter, required heating depth, target temperature, production speed and induction coil design. Higher frequency does not automatically mean faster or more efficient heating.
How do I select the right ZG-HF model?
Provide the workpiece material, dimensions, heated area, target temperature, required cycle time, available input voltage and production quantity. Based on this information, the appropriate power supply, frequency range, transformer and coil can be evaluated.
Can a high-frequency induction heater heat steel rods and bars?
Yes, it can be used for localized heating, end heating, surface hardening and preheating of suitable rods and bars. However, large-diameter bars requiring uniform through-heating may need a lower-frequency induction heating system.
Does the ZG-HF Series require water cooling?
The ZG-HF Series is water-cooled. The power supply, transformer and induction coil must operate within the specified water temperature, pressure and flow requirements. The exact cooling requirements should be listed separately for each model.
