INEL Induction hardening Industry

We manufacture medium frequency converters that take up very little space and are easy to use.

Features

• conversion of low frequency energy from the electrical grid into single phase medium frequency energy (AC/DC and DC/AC conversion)
• supply of powering induction heating devices
• output power from 10 kW to 2.000 kW
• output frequencies from 50 Hz to 100.000 Hz
• voltage and current output protection
• automatic frequency adjustment to the loaded oscillating circuit
• galvanic separation from the grid with a MF transformer
• baseed on state-of-the-art semiconductor technology (thyristors, IGBT transistors)
• air and water cooling

Advantages

• compact realisation
• space saving
• easy to use
• ready to use
• no losses when running under no-load
• up to 95 % energy efficiency
• continuous power regulation from 5 % to 100 %
• frequency range between 50 % and 150 % of the nominal frequency

Usage

Medium frequency converters with powers ranging from 10 kW to 2.000 kW and frequencies ranging from 250 Hz to 50.000 Hz are used with smelters, to melt grey iron, steel, nonferrous and precious metals in a graphite crucible as well as quartz and glass.
Capacities of melting crucibles range from 0,5 kg to 5.000 kg. They are used to melt metals with a melting point above 2.000 °C. Melting is conducted simply in the open, under vacuum conditions or in a protective atmosphere.

Advantages

• short melting times
• significant energy savings
• even alloying due to vertical melt mixing in the electromagnetic field
• improved product quality
• possibility of melting under vacuum conditions
• reduced dimensions
• improved working conditions (noise, heat, dust)
• environment friendly technology

Technical specifications

Example of melting high alloyed steel with the PT2000K05 unit

Converter

• Power supply: 2×(3×710 V)/50 Hz, 2.200 kVA
• MF output: 2.000 kW, 2.000 V, 300-500 Hz
• Cooling: air and water
• Dimensions: 3.000 × 600 × 2.200 mm

Smelter

Melting capacity:

• 3.500 kg/h – steel at 1.600 °C
• Crucible volume: 4.000 kg

Usage

Medium frequency converters with power ranges 20 kW and 1.000 kW and working frequencies between 250 Hz and 50.000 Hz are used with heaters to heat round or square profiles and pipes made of steel or nonferrous metals (copper, brass, aluminium) and measuring from 1 to 150 mm in diameter – to a temperature of 1.250 °C before remodelling (forging, bending). Heating systems are customized to fit customer’s needs. They occupy very little space. Examples of use: screws with a special head design (M10-M100), nuts, bolts, tools, spanners, wrenches, links, sheet punching tools, ejectors, continuous curving of pipe sections (1/2″-12″, radius from 2,5D upward).

Advantages

• direct heating within the material with eddy currents (skin effect)
• medium frequency heating reaches several millimetres of depth
• improved product quality due to low level of surface combustion (up to 0,06 mm, up to 0,3 mm with gas)
• no grain formation within the structure and no carbon losses on the surface of the processed item (heating from 5 to 50 sec)
• unvarying temperature of up to 0,1 %
• imcreased durability of forging tools
• power consumption for steel from 0,35 to 0,5 kWh/kg at up to 1.250 °C
• no demands for workers (heat, noise)
• environment friendly technology
• increased productivity

Technical specifications

Example of screw forging with the TRM135K3 device

Converter

• Power supply: 3×400 V/50 Hz, 150 kVA
• MF output: 135 kW/1,5 kHz to 4,5 kHz
• Cooling: air and water
• Dimensions: 1.200×600×2.100 mm

Heating system

• Capacity: up to 300 kg/h of steel with a diameter
• of 19 to 120 mm or 13 to 80 mm at 1.250 °C
• Cooling water consumtion: up to 1,5 m3/h
• Dimensions: 1.200×600×1.200 mm

Usage

Medium frequency converters are used with heating systems for surface hardening of steel products and tools.
Based on your requirements, we make converters with induction hardening equipment with power outputs ranging from 50 kW to 800 kW and output frequencies from 50 Hz to 100 kHz.
Hardening is possible whether the treated unit or the inductor is in standstill or in motion.

Advantages

• short heating times
• medium frequency (MF) enables depth heating from 1 mm to 50 mm
• direct heating at hardening depth
• unvarying results (constant energy)
• automation of hardening process
• cost reducing use of cheaper materials for the same hardness

Usage

Medium frequency converters with power ranges between 10 kW and 50 kW and working frequencies between 1.000 Hz and 100 kHz are used with heating systems, are used in electronic and machanical engineering and also in the manufacturing of tools.
They are distinguished by extremely small dimensions, good energy efficiency and low power input.
Siver, brass or copper solders are used to join together metal parts (steel, brass, copper, and silver) at a temperature of up to 1.100 °C.
The procedure enables soldering and brazing of metals (Fe, Cu, Au, Ag, and brass), artificial and sintered diamonds and carbide plates onto working tools.
We also perform soldering services on our units.

Advantages

• short heating times
• direct heating at the point of soldering
• medium frequency (MF) enables depth heating
• no solder overheating
• unvarying results
• possibility of automation
• soldering in a protective atmosphere
• improved working conditions (light, heat, noise)
• environment friendly technology
• reduced dimensions and weight of the unit
• reduced energy and cooling water consumption