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Lin Yuan,Tong Guo,Zhongjun Qiu,Xing Fu,Xiaotang Hu 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.12
Ultra-precision manufacturing is essential to the production of workpieces of the highest quality in terms of form accuracy, surface accuracy, and integrity. Compared with physical and chemical material removal methods, it has the advantages of high efficiency, high flexibility, and low cost. Because of the direct interaction between the workpiece and the tool during the process of ultra-precision manufacturing, the geometrical parameters of the tool directly affect the surface quality of the workpiece and need to be measured accurately and comprehensively. However, due to the large surface slopes of some tools, some three-dimensional measurement methods cannot measure their geometrical parameters because of limited maximum measurement angle. In this work, we build a focus variation system to make three-dimensional measurements of tools and extract their geometrical parameters. The data processing procedures and the selection of experimental parameters are analyzed in detail using simulations and experiments. Furthermore, we use a step height standard to verify the high accuracy of the measurement system and a roughened fl at surface to evaluate the measurement noise and vertical resolution. Measurements of the parameters of a round nose cutting tool and the surface texture parameters of a grinding tool are conducted and indicate that the focus variation system is suitable for measuring the geometrical parameters of tools for ultra-precision manufacturing.
Zhaoyi Li,Liang Sun,Zhongjun Fu,Yuchao Li,Zhaohui Jiang,Bingtao Tang,Quan Ji,Yanzhi Xia,Ming Wang,Haofei Huang 한국섬유공학회 2021 Fibers and polymers Vol.22 No.3
Calcium alginate fiber is a biomaterial with promising application in textile industry. However, the poor dyeingproperty of this fiber restricts its development. In this study, three PVAm (polyvinylamine) dyes were applied to the exhaustdyeing of calcium alginate fiber and their dyeing behavior under different dyeing conditions was studied. The dyeing resultsrevealed that PVAm dyes were firmly adsorbed on calcium alginate fiber by coordination bonding formed between theprimary amino groups in PVAm backbones of dyes and Ca2+ ions in calcium alginate fiber. This special complex dyeingmode was further confirmed by a Langmuir-type adsorption manner of PVAm-1 dye for calcium alginate fiber. By theformation of this stable chelation structure between dyes and fibers, high exhaustion rates (88.9-97.1 %) and excellent colorfastness were obtained. SEM and XRD results also showed that the surface and crystal phase of dyed fibers had very slightchanges compared to those of original calcium alginate fibers. The strength property of the fiber was also maintained wellafter this special complex dyeing process.