Induction Hardening

High-Frequency Generator

The energy-conserving, all-solid-state type high-frequency generator delivers high-efficiency and stability in a compact package, and is the choice of many customers. The standard model supports frequencies from 20 kHz to 200 kHz, and outputs of 1 kW to 200 kW.

Advantage

feature1Surfaces can be hardened in a very short time of period.

feature2Hardened depth is adjustable.

feature3Heating of limited areas is possible.

feature4Uniform, high-quality hardening is obtained.

feature5Hardening achieved at very low cost.

feature6Workpiece materials may be changed from high priced alloy steel to inexpensive carbon steel.

Applications

Continuous annealing, such as pipe, electrical wire, steel wire, etc.
Heating power supply for MOCVD, vapor deposition CVD, magnetic levitation
Various processing, including hardening, brazing, dissolution, etc.
SiC （crystal, CVD, annealing）

Characteristic

Compact design: Volume ratio 61％ Footprint ratio 71％（Internal comparison for output 200kW）
Supports a wide frequency range: 1kHz to 400kHz
Supports a wide output band: 10kW to 200kW
High reverse conversion efficiency: 90% to 95%

Options

Heating coil
Mechanical system
Output switch unit (automatic / manual)
Frequency switch unit (automatic/ manual)

JMT transistor inverter series standard specifications

Model	Output power ［ｋW］	Frequency ［kHz］	Input voltage ［V］	DC voltage ［V］	DC current ［A］
JMT-15	15	1～400	3φ、220	260	65
JMT-30	30	1～400	3φ、220	260	130
JMT-50	50	1～400	3φ、220	260	220
JMT-100	100	1～400	3φ、440	520	210
JMT-150	150	1～400	3φ、440	520	310

Model	DC output ［ｋW］	AC input ［ｋVA］	Weight ［ｋｇ］	Cooling water ［L/min］	Unit dimensions ［mm］(W×D×H）
JMT-15	16.9	20	165	10	600×450×1200
JMT-30	33.8	40	180	20	600×450×1200
JMT-50	57.2	65	195	20	600×450×1200
JMT-100	109.2	130	660	45	1000×955×1750
JMT-150	161.2	195	680	60	1000×955×1750

※Specification may be revised without notice as improvements are made.

HF Generator

H-100D HF Generator

H-100D HF Generator
［100kw output,10/100kHz switchable］

Induction heating using RF current is now widely utilized in industries for applications such as hardening/tempering/annealing of steel, forging, melting, brazing, etc. There are several types, including the vacuum tube type, transistor type and thyristor type, which are selected for the application according to their different characteristics.
Based on more than 50 years of experience and unrivalled expertise, NDK can meet any customer requirements in this area.

Principle

When the metallic workpiece is placed in a coil, an RF current is applied to the coil, and RF current is induced on the surface of the workpiece causing it to heat up. The heated portion is quenched by using coolant such as water to harden.

High frequency generator standard specifications

Spec＼Model	JMT-series Transistor inverter type	JHS-series Conventional Vacuum tube type
Input power ［V（three phases）‐ｋVA］	200-440・20-260	200-440・10-450
Frequency range ［kHz］	1～400	20～400
Nominal output power ［ｋW］	15～200	5～200
Cooling water ［L/min］	60～150	22～300

※Specification may be revised without notice as improvements are made.

Hardening Machines

N-2QM series hardening machines are designed for hardening of small size gears, cam shafts and rod type products. The N2-QM model transfer distance is standardized to 600, 900, and 1200 mm.
Special purpose or automated machines are available upon request.

N-2QM series hardening machine with
integrated control and operation board（PSW programmer）