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Counter-roller spinning (CRS), where the mandrel is replaced by rollers, is an effective means of manufacturing large-sized, thin-walled, cylindrical parts with more than 2500 mm diameter. CRS is very complex because of multi-axis rotation, multi-local loading along the circumference, and radial-axial compound deformation. Analytical or experimental methods cannot fully understand CRS. Meanwhile,...
Cold rolling process has become an important alternative to form small module spline shafts because there are significant advantages in enhancing the mechanical properties of the component, increasing productivity, reducing production cost. However the study of spline cold rolling process is still very fewer. In the present study, the contact ratio between roller and workpiece in process of spline...
To provide faster, more repeatable and stronger MEMS packaging technology, the dynamic characteristics of ultrasonic transducers are studied using finite element method (FEM), and the ultrasonic generator for driving the transducer is also presented in this paper. The finite element model of the high frequency ultrasonic transducer was established by using ANSYS software, and the vibration characteristics...
A methodology is put forward for the design of high frequency ultrasonic transducer for wire bonding, which is based on the theory of the ultrasonic transducer, finite element method (FEM) and impedance analysis techniques. The axial vibration equation of the bar with varied section, piezoelectric equation and mechanical boundary conditions are used to conceive and design the transducer. Using the...
A methodology for designing high-frequency ultrasonic transducers is proposed in order to improve the speed and stability of bonding as well as the conversion efficiency of ultrasonic energy, and the phases of the design process are expressed in detail. The design process can be divided into three steps: the topology design of the components, finite element method (FEM) aided analysis optimization...
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