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Research on Simulation and Experiment of Chip Shape for Machining High Temperature Alloy
Fengyun Yu,YuanTu,He Wang,Yunliang Fu 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.8
For superalloy GH4169poor processing, tool wear serious, affecting the surface quality of the workpiece and other issues, using the finite element software AdvantEdge to simulate the formation process of superalloy GH4169 chip in two-dimensional, and researching the characterization of serrated chip. Take the single factor experiment and conduct finite element simulation for superalloy GH4169 in changing the rake angle and tip arc radius of the situation. The simulation and the chip shape taking from experiments will be compared to prove the feasibility of the simulation. And find out changes of rake angle and tiparc radius; make clear the influence of degree of serrated chip. The results show: with the rake angle increases, serrated degree increases, and with tiparc radius increases, serrated degree increases. The study provides a reference for reasonable choice of optimized cutting tool geometric parameters.
Fengyun Yu,He Wang,Yunliang Fu 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.5
For nickel base superalloy GH4169 is investigated in the process of machining tool is easy to wear,cold-setting severe deformation, surface quality is difficult to guarantee and so on, using different carbide cutting tools and different tool geometry parameters, nickel-based superalloy GH4169 be turning experiments. The cutting tool material, cutting tool rake angle and corner radius of the influence law of super alloy surface roughness, different tool wear condition analysis. Results show that using K313, KC5510, SM1105 three kinds of cutting tool materials processing, the difference of obtained surface roughness is not big, but for the tool wear condition, the rake face and rear face wear of KC5510 is small. Integrated tool wear and workpiece machined surface quality, in the selection of the four tool materials, KC5510 is more suitable for processing GH4169; Single factor experiments found that with the gradual increase in rake angle and the corner radius, the surface roughness gradually decreases. Therefore, when GH4169 be turning, in order to reduce the surface roughness, grain refinement should be used, together with the PVD TiAlN coating carbide cutting tools, while a larger rake angle and corner radius are selected.
Experimental Study of Factors Affecting the 7075 Aluminum Alloy Thin-walled Parts Milling Force
Fengyun Yu,Lin Wu,Yunliang Fu,Yanyan Guo,Can Zhao,Xufeng Wang 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.8
Taking 7075 aluminum alloy thin-walled part as the research object, with higher cutting parameters than the normal value selected, a four factors and four levels orthogonal experiment was carried out, in which we chose YG carbide cutting tools for the milling, intercepted the milling force stable section, selected ten peak values and took an average, conducted multiple linear regression analysis using Matlab numerical calculation software and established the milling force empirical formula of 7075 aluminum alloy thin-walled part to study the factors which have influence on its milling force. By range analysis of the experimental results, the cutting force change rule in the manufacturing process of aluminum alloy with the change of cutting parameter was revealed. It is found that the axial cutting depth had the greatest influence on the force perpendicular to the direction of cutting surface, and the radial cutting depth had the minimal impact. By comparative analysis on theoretical value and experimental value of milling forces, we found that the predicted value of the milling force Fx and Fy in theory were in good agreement with the experimental results with a relative error less than 8.7%. Under the experimental conditions, the optimal milling parameters are axial cutting depth of 2mm, radial cutting depth of 0.5mm, feed speed 95mm/min and cutting speed of 23.86m/min. It will provide data and experiment support for milling of thin-walled parts of similar materials, which will have important practical value and theoretical significance for engineering.
Bran characteristics influencing quality attributes of whole wheat Chinese steamed bread
Ma, Fengyun,Lee, Yu Young,Baik, Byung-Kee Elsevier 2018 Journal of cereal science Vol.79 No.-
<P><B>Abstract</B></P> <P>This study investigated the variations in the characteristics of brans obtained from a pilot-scale milling of 17 soft red winter wheat varieties and their influences on the quality of whole wheat northern-style Chinese steamed bread (CSB) prepared from blends of a base flour, brans of different wheat varieties and vital gluten. Protein, starch, total dietary fiber (DF), water extractable arabinoxylan (WEAX) and total phenolic contents of brans ranged from 14.3 to 19.1%, 12.0–19.4%, 43.5–50.3%, 0.69–1.35% and 14.3–18.9 mg/g, respectively. Surface smoothness, crumb structure and stress relaxation scores of whole wheat CSB ranged from 3.0 to 9.5, 6.5–12.5 and 24.3–34.3, respectively. Bran bound and total phenolic contents exhibited negative relationships with CSB surface smoothness and crumb structure. Bran WEAX content showed positive relationships with CSB specific volume, surface smoothness and stress relaxation scores. Bran insoluble DF content was negatively related to CSB stress relaxation score. Bran protein and starch contents showed negative and positive relationships, respectively, with CSB spread ratio score. Cluster analysis of wheat brans based on CSB surface smoothness and crumb structure indicated that bran with a low protein content, low bound and total phenolic contents, and high starch and WEAX contents is desirable for making whole wheat CSB.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Bran of 17 wheat varieties showed substantial variations in bran characteristics. </LI> <LI> Bran water extractable arabinoxylans (WEAX) affected steamed bread (SB) volume. </LI> <LI> Bran phenolic content (PC) influenced SB surface smoothness and crumb structure. </LI> <LI> Bran insoluble dietary fiber affected stress relaxation score of whole wheat SB. </LI> <LI> Bran with a low PC, and a high WEAX content is desirable for making whole wheat SB. </LI> </UL> </P>
Computer Simulation of Metal Surface Micro-Crack Inspection Using Pulsed Laser Thermography
Tang Qingju,Bu Chiwu,Liu Yuanlin,Yu Fengyun,Zhao Yawei 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.3
Surface micro cracks are easy to produce in the preparation and service process of metal material, which impacts on the safe operation of metal components. Pulsed laser spot excitation and infrared thermal imaging technology are combined to detect metal surface micro-cracks. The working principle of laser infrared thermal imaging detection technology was described. The three dimensional heat conduction model of pulsed laser excitation flux transfer in metal plate was established, and calculated using finite element method (FEM). The results showed that, thermal flow in the image is a “D” shape. There are temperature differences between the sound regions and defective regions, and the defects experiences the process of obscure, gradually clear, and gradually obscure. Pulsed infrared thermography sequence was processed by polynomial fitting method, and the coefficient images effectively improve the contrast between defective and non-defective areas, which is beneficial to the determination and of recognition micro cracks.
Correlation of NUF2 Overexpression with Poorer Patient Survival in Multiple Cancers
Xiaodan Jiang,Yan Jiang,Senbiao Luo,Karthik Sekar,Clara Kai Ting Koh,Amudha Deivasigamani,Qingzhe Dong,Niankai Zhang,Shenling Li,Fengyun Hao,Brian Kim Poh Goh,London Lucien Ooi,Yu Wang,Kam Man Hui 대한암학회 2021 Cancer Research and Treatment Vol.53 No.4
Purpose NUF2 has been implicated in multiple cancers recently, suggesting NUF2 may play a role in the common tumorigenesis process. In this study, we aim to perform comprehensive meta-analysis of NUF2 expression in the cancer types included in the Cancer Genome Atlas (TCGA). Materials and Methods RNA-sequencing data in 31 cancer types in the TCGA data and 11 independent datasets were used to examine NUF2 expression. Silencing NUF2 using targeting shRNAs in hepatocellular carcinoma (HCC) cell lines was used to evaluate NUF2’s role in HCC in vitro and in vivo. Results NUF2 up-regulation is significantly observed in 23 out of the 31 cancer types in the TCGA datasets and validated in 13 major cancer types using 11 independent datasets. NUF2 overexpression was clinically important as high NUF2 was significantly associated with tumor stages in eight different cancers. High NUF2 was also associated with significantly poorer patient overall survival and disease-free survival in eight and six cancers, respectively. We proceeded to validate NUF2 overexpression and its negative association with overall survival at the protein level in an independent cohort of 40 HCC patients. Compared to the non-targeting controls, NUF2 knockdown cells showed significantly reduced ability to grow, migrate into a scratch wound and invade the 8 μm porous membrane in vitro. Moreover, NUF2 knockdown cells also formed significantly smaller tumors than control cells in mouse xenograft assays in vivo. Conclusion NUF2 up-regulation is a common feature of many cancers. The prognostic potential and functional impact of NUF2 up-regulation warrant further studies.