Heat Treatment Technology

In heat treatment, metal is heated and cooled to impart microstructural changes. Some processes such as quenching and tempering are necessary to produce the characteristics required by springs. Since the required characteristics such as fatigue resistance, settling resistance, mass, cost, etc. vary depending on the uses of various springs, it is necessary to perform the most appropriate heat treatment.

POINT

Evolution of Heat Treatment for Achieving Carbon Neutrality

We have introduced electric heating, high-frequency heating using electricity, and other technologies which have smaller CO2 emissions. We have also developed stabilizer bars that do not require tempering, which was previously an essential process. NHK Spring is committed to accelerating its efforts toward carbon neutrality and energy conservation by taking advantage of these strengths.

Spring manufacturing using electric heating

Stabilizer bar quenching by electric heating

Coil spring tempering by electric heating

Development of non-tempered stabilizer bars

Non-tempered solid stabilizers

Reduction of CO₂ emissions through reducing processes

Stabilizer bar manufacturing process