In this continuous induction hardening process, the jack is raised and lowered at a high frequency of one stroke every 15 seconds, and even a slight deviation in the stopping position causes uneven hardening. With the conventional hydraulic method, it is difficult to achieve both high speed and positional accuracy, which leads to issues such as quality variations and defects.

By adopting a servo motor-driven Linispeed Jack, we have achieved both high speed lifting and high stopping accuracy. Because the stopping position is stable even during high frequency lifting operations, it is possible to control the hardening conditions for each part consistently, stabilizing hardening quality and reducing the defect rate. This contributes to improving the reliability of the entire mass production process while maintaining a stable production takt time.