Ultrasonic Surface Peening
Ultrasonic surface hardening increases the hardness and fatigue strength of metal surfaces by controlled peening with high-frequency ultrasonic vibrations.
Physico-Chemical Mechanism of Action
Ultrasonic surface hardening uses high-frequency sound waves that strike the metal surface in a controlled manner. This causes microscopic stresses and deformations in the material, changing the crystal structure and increasing hardness.
Metallurgical Relevance & Welding Risks
Hardening increases the toughness of the surface layer, making the tool hold up better under high stress. However, too strong an impact can lead to micro-deformations or even grain changes that can soften the material. An imprecise ultrasonic process can therefore worsen tool quality.
Shop Practice & Instructions
To ensure successful hardening, set the ultrasonic frequency between 20 kHz and 50 kHz. The impact pressure should be set to about 100 N/cm². The hardening time typically ranges from 30 to 60 seconds. Keep the tool surface clean and free of dirt before the process.