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In this work, a refined microstructure is obtained in a Ti‐40Al‐8Nb‐0.5B alloy (at%) by hot deformation in the (α + β) phase region and subsequent tempering at 800 °C. The results show that the dynamic recrystallization of α phase occurred during the hot deformation, which resulted in the grain refinement from 56 to 18 µm. Meanwhile, high‐density stacking faults are introduced into the deformed α...
Experiments are carried out to investigate the effects of dome structure on the combustion performance of a trapped vortex combustor. The effects are directly explored in terms of combustion efficiency, ignition and lean blowout limits with three different dome structures. The experimental results indicate that the fairing-tube configuration exhibits excellent advantages in lean blowout limits and...
Stepping motion is the movement of output execution with fixed period of motion, and the cam type manipulator has the characteristics of steady movement, accurate transmission, controllable working speed and low cost. According to the output step action design 6 different types of cam mechanism(plane groove cam, cylindrical cam, globoidal cam mechanism with cylinder cam mechanism, plane groove cam-cylindrical...
The cam-type ATC manipulator has the advantages of fast tool changing and high efficiency, but the structure is complex and difficult to design. This paper proposed a new method of globoid cam 3D modeling for ATC manipulator-double-globoid cam mechanism, which could solve the design problem of the cam-type ATC device. Then, the multi-ridge dynamics model of the cam-type ATC manipulator was established;...
Laser die transfer technique provides an efficient solution for fast transportation of microchips in microassembly. Capillary self-alignment is able to achieve parallel and high-accuracy alignment of microchips on receptor sites. In this paper, we propose a new hybrid microassembly strategy, which combines laser die transfer and capillary self-alignment techniques. The laser die transfer technique...
For the prevention and control of chemical pollution made by synthetic pigments and existing antibacterial agents, the antibacterial function natural scutellaria baicalensis georgi pigments were compounded with biodegradable polyester poly(butylene succinate) (PBS) for dying. A biodegradable antimicrobial plastic were prepared. The properties of the dyed films with different pigments proportions,...
The present situation of research on hybrid electromechanical system is introduced, and then the concept of the hybrid cam-linkage mechanism is presented and its signification is expounded. The basic structure of hybrid cam-linkage mechanism is given. Based on the inverse kinematic analysis, the boundary condition of the flexible workspace is derived by using the graphic method. A representative hybrid...
A stacked injection mold with hot runner is designed to form the inside bracket of global pick-up head after analysing its structure. The mold which used stacked molding, hot runner system and open mold system of gear and rack can enhance productivity greatly under the premise of product quality guaranteed. In the mould design process, Pro / E Modeling module is used to establish the bracket model...
In the view of the difficult problem to receive the original design of the cam and its follower motion specification, an efficient, rapid and accurate reverse design for cam mechanisms is provided. This paper does research on the motion specification of cam mechanisms through establishing mathematical model, motion simulation and analysis. Firstly, amends the measured parameters achieved by the CMM...
Based on the analysis of current situation and application prospect of hybrid electromechanical system, the concept of hybrid cam-linkage mechanism is proposed and its significance is expounded. The basic form of hybrid-driven mechanism is given and its kinematic principle is analyzed. Take realizing ellipse path with scheduled timing mark as example, the design method of hybrid cam-linkage generating...
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