Surface hardening method of spring such as plate spring, involves using ultrasonic balls that are accelerated by sonotrode for radiating ultrasonic waves onto underside, inner side and outer side of spring

摘要

The method involves using ultrasonic balls that are accelerated by sonotrode for radiating ultrasonic waves onto underside, inner side and outer side of a spring. The surface area of the spring is borated and/or nitrated.