Aiming at the problem that giant magnetostrictive actuator has short stroke and is difficult to be popularized. Combining the advantages of large stroke of voice coil motor with high precision of giant magnetostrictive actuator, a coaxial integrated structure of macro-micro composite actuator with large stroke and high precision is proposed. According to the working principle of composite actuator, the coaxial integrated design scheme of composite actuator is verified by electromagnetic field simulation analysis, and in the process of macro motion in 0-20 mm, the distribution of magnetic force line of macro-motion coil, the effect of macro-motion coil on the distribution of micro-motion magnetic field, and the effect of micro-motion coil on macro-thrust are analyzed. The analysis results show that the distribution of magnetic force line is reasonable and the average axial magnetic field intensity of GMM rod is in the range of 495~640A/m in the macro displacement of 0-20mm, and that the static thrust difference of macro moving part is controlled within 4N in the stroke of macro displacement 6-14mm, which indicates that the coaxial integrated design scheme of macro-micro composite actuator is feasible. The research results provide a theoretical basis for the development of large-stroke and high-precision actuators in the field of precision manufacturing.
Giant magnetostrictive material (GMM) is an attractive material for sensors because of its characteristics including high relative permeability and high magneto-mechanical coupling coefficient. Based on the Villari effect and crystal anisotropy theory of this material, the mathematical models which describe the relation between GMM rod permeability and its pressure, the relation between induction coil inductance and its relative permeability were established in this paper. The models were simulated and analyzed by using MATLAB software. The results show that there is a good linear relationship between the pressure exerted on the GMM rod and the inductance of induction coil, which lays a theoretical basis to design a three-dimensional force sensor with high precision, high stability and good output characteristics.
When a working cylinder of the pressing machine working cylinder was stuck and underwent retracted conversion, pressure shock was high in working cylinder cavity and flow pulsation was distinct in the pipeline due to the high working pressure and frequent retracted transformation of the working cylinder, which not only shortened the service life of the pressing machine, but also exerted serious impacts on the machining precision and quality, especially after the pressing machine applied loads and high-pressure oil in work rod end cavity of working cylinder needed to be relieved in a short time. In order to research and analyze the better pressure relief characteristics of the two types of pressure relief circuits of the pressing machine, the paper established models, carried out simulation and analysis and then made contrastive analysis of the working cylinder rod velocity, rod acceleration and port pressure pulsation according to the simulation results.
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