The Design of Rare-Earth Giant Magnetostrictive Ultrasonic Transducer and Experimental Study on Its Application of Ultrasonic Surface Strengthening

Abstract

Ultrasonic transducer based on rare-earth giant magnetostrictive materials was designed in accordance with the technical requirements of ultrasonic surface strengthening. The whole structure of the transducer was designed. Modal analysis is made to get the natural frequency of the compound oscillator. The working frequency of the transducer should be guaranteed at about 15.2 kHz and the composite oscillator should have relatively better vibration mode. The magnetic field of the transducer is well sealed and the transducer will not show obvious magnetic flux leakage phenomenon. Which shows the rationality of structural design. Based on this transducer, the ultrasonic surface strengthening experiment on 40 steel was conducted. The surface roughness and hardness of the parts were analyzed after the experiment. The results show that the surface of the parts reach the mirror surface result after the ultrasonic strengthening. When compared to the previous process, the roughness decreases by about 75%, and the surface hardness increases by more than 20%.

New Type of Linear Magnetostrictive Motor Designed for Outer Space Applications, from Concept to End-Product

“…GMAs are generally used in applications where several requirements must be met simultaneously, such as high forces (hundreds of N), small linear displacements (tens of µm), and high frequencies (of up to 15 kHz). In this regard, an ultrasonic transducer based on rare-earth giant magnetostrictive materials could be designed to comply with the technical requirements of ultrasonic surface strengthening [3].…”

“…The bias magnetic field can be produced by using a cylindrical, axially magnetized permanent magnet [7,8], by several permanent magnets stacked with the active magnetostrictive material [1], or by a permanent magnet positioned near the MAC, at the bottom [3,10]. However, for enhanced and flexible control of GMA (the LMM), the bias magnetic field can be produced by either a magnetic bias coil [16,17] or a combination of permanent magnets and a magnetic bias coil [18].…”

Research on path planning of robotic ultrasonic surface strengthening for turbine blade based on dynamic response of ultrasonic surface strengthening

“…Ultrasonic surface strengthening technology has a very strong strengthening ability for fine finishing surface, which improves the hardness and wear resistance of the processed surface, reduces the surface roughness, and has low processing cost and significantly improves the production efficiency. 1 At present, ultrasonic surface strengthening technology is widely used in strengthening regular surfaces (such as plane, cylindrical surface, and spherical surface), and surface strengthening of regular surface is mainly carried out by integrating an ultrasonic surface strengthening system on a universal machine tool. However, for free-form surface parts (such as turbine blades, propeller blades, and mold cavities), the path of strengthening operation is complex, so the application of ultrasonic surface strengthening technology for such parts is less.…”

Editorial for the Special Issue on Micro-Machining: Challenges and Opportunities

“…This special issue of Micromachines , entitled “ Micro-Machining: Challenges and Opportunities ”, collects 16 original research papers and one review article that provides updates on the latest micro-machining technologies, including novel research on and development of diamond turning [ 1 , 2 ], micro-milling [ 3 , 4 , 5 ], micro-grinding [ 6 ], polishing [ 7 , 8 , 9 ], laser micro-machining [ 10 , 11 , 12 ], lithography-based micro-machining processes [ 13 ], ultrasonic devices [ 14 ], control systems for hybrid machines [ 15 ], on-machine surface metrology [ 16 ], and the surface and subsurface integrity characterization technique [ 17 ].…”

“…They researched and developed a novel ultrasonic assisted diamond turning device to restrain tool wear and obtain nano-smoothed surface. To further extend the application of ultrasonic technology, Fang et al [ 14 ] designed a novel ultrasonic transducer based on rare-earth giant magnetostrictive materials which can overcome problems of small vibration amplitude and power loss for current piezoelectric ceramic transducers. They applied this new transducer in a surface strengthening experiment for #40 steel and demonstrated a mirror surface finish and 20% increase of surface hardness of the test part.…”