The exploration of the causes of dropping end is much necessary in raising reelabilityof poor raw cocoon. This paper, by an analysis of the curves of gumming force and dissoci-ating tension of cocoon filament, put for...The exploration of the causes of dropping end is much necessary in raising reelabilityof poor raw cocoon. This paper, by an analysis of the curves of gumming force and dissoci-ating tension of cocoon filament, put forward a view that dissociation consists of a processof alternate tension and relaxation of the tensile force on the bave being dissociated. Also,based on the cocooning pattern of silkworms and the composition of the tensile force indissociation, a conclusion was reached that dropping end takes place when the energy con-sumed in dissociating a certain length of bave goes beyond the work of brittle rupture of thebave. Consequently tests were made in possible ways to improve reelability and the resultswere discussed.展开更多
Electrochemical micromachining （EMM） technology for fabricating micro structures is presented in this article. By applying ultra short pulses, dissolution of a workpiece can be restricted to the region very close to...Electrochemical micromachining （EMM） technology for fabricating micro structures is presented in this article. By applying ultra short pulses, dissolution of a workpiece can be restricted to the region very close to the electrode. First, an EMM system for meeting the requirements of the EMM process is established. Second, sets of experiments is carried out to investigate the influence of some of the predominant electrochemical process parameters such as electrical parameters, feed rate, electrode geometry features and electrolyte composition on machining quality, especially the influences of pulse on time on shape precision and working end shape of electrode on machined surface quality. Finally, after the preliminary experiments, a complex microstructure with good shape precision and surface quality is successfully obtained.展开更多
文摘The exploration of the causes of dropping end is much necessary in raising reelabilityof poor raw cocoon. This paper, by an analysis of the curves of gumming force and dissoci-ating tension of cocoon filament, put forward a view that dissociation consists of a processof alternate tension and relaxation of the tensile force on the bave being dissociated. Also,based on the cocooning pattern of silkworms and the composition of the tensile force indissociation, a conclusion was reached that dropping end takes place when the energy con-sumed in dissociating a certain length of bave goes beyond the work of brittle rupture of thebave. Consequently tests were made in possible ways to improve reelability and the resultswere discussed.
基金National Natural Science Foundation of China (50635040)National High-tech Research and Development Program (2009AA04Z302)Jiangsu Provincial Natural Science Foundation (BK2008043)
文摘Electrochemical micromachining （EMM） technology for fabricating micro structures is presented in this article. By applying ultra short pulses, dissolution of a workpiece can be restricted to the region very close to the electrode. First, an EMM system for meeting the requirements of the EMM process is established. Second, sets of experiments is carried out to investigate the influence of some of the predominant electrochemical process parameters such as electrical parameters, feed rate, electrode geometry features and electrolyte composition on machining quality, especially the influences of pulse on time on shape precision and working end shape of electrode on machined surface quality. Finally, after the preliminary experiments, a complex microstructure with good shape precision and surface quality is successfully obtained.
