A novel ultrasonic surface machining tool utilizing elastic traveling waves

Area of Science:

• Materials Science and Engineering
• Mechanical Engineering
• Nanotechnology

Background:

• Ultra-precision machining is crucial for advanced technology but limited by joint clearance, feeding inaccuracy, and high contact stress.
• Existing methods struggle to meet the demands for higher precision and reduced surface damage in modern industrial applications.

Purpose of the Study:

• To propose and verify a novel surface machining method using structural elastic waves.
• To develop a piezoelectric-actuated machining tool for ultra-precision surface fabrication.
• To investigate the influence of vibration modes and driving signal parameters on machining performance.

Main Methods:

• Utilized finite element method (FEM) for calculating the configuration and vibration modes of the machining tool.
• Determined the optimal working frequency through vibration characteristic experiments on a prototype.
• Conducted machining characteristic experiments to validate the proposed method, varying contact force, voltage, and phase shift.

Main Results:

• Achieved a minimum working contact force of 1N, resulting in a chipped depth of 1.93μm after 5 minutes.
• Optimized conditions (6N contact force, 400Vpp driving voltage, π/2 phase shift, 5 min) yielded a surface roughness of approximately 0.20μm.
• Demonstrated efficient machining with low contact force, low residual stress, and minimal damage.

Conclusions:

• The proposed structural elastic wave machining method significantly enhances surface quality and precision.
• The piezoelectric-actuated tool eliminates joint clearance errors inherent in kinematic pairs.
• This innovative approach offers a promising solution for achieving high-quality machined surfaces with reduced damage.