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第六届工程机械与车辆工程新进展国际学术会议

作者： Yuan Xiaoming Wang Xikun Zhao Shiyi Sun Jing Key Laboratory of Advanced Forging & Stamping Technology and Science Yanshan University Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University

To improve the jet performance of a fire water monitor,the monitor head with three different inner contour lines were *** on FLUENT,the calculation domain was defined geometrically and then

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Performance Analysis of Star-Shaped Flow Regulator with Different Structures

Performance Analysis of Star-Shaped Flow Regulator with Diff...

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第六届工程机械与车辆工程新进展国际学术会议

作者： Yuan Xiaoming Zhao Shiyi Sun Kunxing Zhang Lijie Key Laboratory of Advanced Forging & Stamping Technology and Science Yanshan University Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University

In order to evaluate the hydraulic performance of a regulator,the pressure loss and the stabilization performance of the regulator installed in the fire water monitor were *** effects of st

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Data-driven casting defect prediction model for sand casting based on random forest classification algorithm

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China Foundry 2024年第2期21卷 137-146页

作者： Bang Guan Dong-hong Wang Da Shu Shou-qin Zhu Xiao-yuan Ji Bao-de Sun Shanghai Key Lab of Advanced High-Temperature Materials and Precision Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Lab of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240China Hefei Casting and Forging Factory of Anhui Heli Co. LtdHefei 230000China State Key Laboratory of Materials Processing and Die&Mould Technology Huazhong University of Science and TechnologyWuhan 430074China

The complex sand-casting process combined with the interactions between process parameters makes it difficult to control the casting quality,resulting in a high scrap rate.A strategy based on a data-driven model was proposed to reduce casting defects and improve production efficiency,which includes the random forest(RF)classification model,the feature importance analysis,and the process parameters optimization with Monte Carlo *** collected data includes four types of defects and corresponding process parameters were used to construct the RF *** results show a recall rate above 90% for all *** Gini Index was used to assess the importance of the process parameters in the formation of various defects in the RF ***,the classification model was applied to different production conditions for quality *** the case of process parameters optimization for gas porosity defects,this model serves as an experimental process in the Monte Carlo method to estimate a better temperature *** prediction model,when applied to the factory,greatly improved the efficiency of defect *** show that the scrap rate decreased from 10.16% to 6.68%.

关键词： sand casting process data-driven method classification model quality prediction feature importance

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Design and Analysis of a New 5-DOF Hybrid Serial-Parallel Manipulator

Design and Analysis of a New 5-DOF Hybrid Serial-Parallel Ma...

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作者： Xu, Yundou Xu, Zhenghe Yang, Fan Mei, Youen Yue, Yi Zhou, Yulin Yao, Jiantao Zhao, Yongsheng Laboratory of Parallel Robot and Mechatronic System of Hebei Province Yanshan University Qinhuangdao066004 China Key Laboratory of Advanced Forging & Stamping Technology and Science Yanshan University Qinhuangdao066004 China Shanghai Aerospace Equipment Manufacture Company Limited Shanghai201100 China School of Mechanical Engineering Yanshan University Qinhuangdao066004 China

In this paper, a 2R1T (two rotations and one translation) over-constrained parallel mechanism R(2RPR)R/SP with two ordered continuous rotational axes is proposed, which contains fewer joints, by concatenating a 2-degree-of-freedom (DOF) RR tilting head with orientation-adjusting capability, a novel 5-DOF hybrid manipulator is constructed. On this basis, optimize the sizes with the best performance of the motion/force transmissibility as the optimization target, and the design dimensions that meet the requirements of the workspace are obtained and the structural design is carried out. The static stiffness of the manipulator are analyzed, and the analysis results are verified by simulation and compared with the products that have been successfully applied in foreign countries. An iterative searching method is used to determine the workspace of the manipulator, and evaluate whether the workspace of the hybrid manipulator meets the requirements. © 2020, Springer Nature Singapore Pte Ltd.

关键词： Manipulators

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The Simulation Study On Cutting Patterns For Cutting Head Of Longitudinal Axial Roadheader

The Simulation Study On Cutting Patterns For Cutting Head Of...

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第六届工程机械与车辆工程新进展国际学术会议

作者： Yuan Xiaoming Shen Minghui Zhang Lijie Key Laboratory of Advanced Forging & Stamping Technology and Science Yanshan University Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University

The simulation of drilling condition and swing condition is completed with *** cutting patterns of cutting process is drawn for cutting head of longitudinal axial *** variations of c

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Development and application of light-weight design of the aluminum alloy wheel

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2012 International Conference on Engineering Materials, Geotechnical Engineering and Environmental Engineering, EMGEEE 2012

作者： Hu, Jinhua Liu, Xinxin Sun, Huixue Zhu, Zhihua Li, Baohua Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University Ministry of Education of China Qinhuangdao 066004 China Qinhuangdao Yanda Modern Integrated Manufacturing Technology Development Co. Ltd Qinhuangdao 066004 China Research and Design Department Citic Dicastal Co. Ltd Qinhuangdao 066004 China

ISBN: (纸本)9783037856697

In order to implement the optimization design for a forging aluminum wheel, the wheel's structural optimization design software, i.e. DWheel, was developed in this paper. DWheel was programmed based on C# and ANSYS applying the restrained variable-dimension method. The key data interface commands were introduced first. Subsequently, the software was applied on a forging wheel's structural optimization design. The optimized wheel passed the practical testings successfully. © (2013) Trans Tech Publications, Switzerland.

关键词： Structural optimization

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Effect of Rolling Reduction Rate on the Microstructure of Hot Rolling Stainless Steel Clad Plate 5

Effect of Rolling Reduction Rate on the Microstructure of Ho...

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2018 5th International Conference on advanced Composite Materials and Manufacturing Engineering, ACMME 2018

作者： Jin, Herong Zhang, Lei Yi, Yali Key Lab. of Advanced Forging and Stamping Technology and Science of Ministry of National Education Yanshan University Qinhuangdao066004 China Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan University Qinhuangdao066004 China School of Mechanical Engineering Yanshan University Qinhuangdao066004 China

The macro-scale and meso-scale simulation models of stainless steel clad plate were established by DEFORM-3D. The multi-scale coupling simulations of clad plate with different rolling parameters were carried out. The seven pass hot rolling process of stainless steel clad plate was simulated by numerical simulation. By contrasting the vertical stress and the deformation resistance of cladding layer, the rolling reduction rate satisfying interface bonding was obtained. The grain distribution at the center of the substrate layer was analyzed and reasonable hot rolling reduction rates were selected considering their effects on the recrystallization volume percent and the grain size. The results show that the grain size decreases with the increase of reduction rate. However, too much reduction rate will decrease the rate of recrystallization volume percent and the refining effect of grain is not obvious. To ensure uniform grain size distribution, it is most reasonable to set the rolling temperature to 1150°C and the reduction rate to 50%. © Published under licence by IOP Publishing Ltd.

关键词： Stainless steel

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Effects of Cutting Angle on Load Characteristics of Picks on Roadheader

Effects of Cutting Angle on Load Characteristics of Picks on...

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第六届工程机械与车辆工程新进展国际学术会议

The horizontal yaw cutting condition of the picks was analyzed to study the load characteristics of a roadheader’s cutting *** on theoretical calculation,the range of the cutting angle was cert

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The Research on The Seawater Desalination System of Electro Hydraulic Proportional Valve Controlled Hydraulic Cylinder

The Research on The Seawater Desalination System of Electro ...

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第六届工程机械与车辆工程新进展国际学术会议

作者： ZHANG Qisheng LI Wenlei LIU Feng ZHAO Jingyi Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University Key Laboratory of Advanced Forging & Stamping Technology and Science(Yanshan University)

The shortage of water resources is a major challenge of the world,seawater desalination is the best way to solve the crisis of water *** osmosis membrane desalination equipment needs to

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Near-α Ti60 alloy dwell fatigue basal slip-induced cracking: faceted crack initiation and local strain evolution

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Journal of Materials science & technology 2025年

作者： Boning Wang Weidong Zeng Zibo Zhao Runchen Jia Jianwei Xu Qingjiang Wang Heng Li State Key Laboratory of Solidification Processing School of Materials Science and Engineering Northwestern Polytechnical University Xi’an 710072 China Defense Technologies Innovation Center of precision forging and ring rolling School of Materials Science and Engineering Northwestern Polytechnical University Xi’an 710072 China Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment Northwestern Polytechnical University Xi’an 710072 China Shi Changxu Innovation Center for Advanced Materials Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

Basal fracture due to dwell fatigue (DF) is primary cause of core material failure during aero-engine service, which highlights the importance of understanding the crack initiation mechanism. In this study, the relationship between activation of plastic slip within the [0001] basal plane orientation, local strain and crack initiation in near-α Ti60 alloys was investigated using coupled in situ and high-resolution digital image correlation (HR-DIC) methods. The results show that basal slip is preferentially activated resulting into a higher shear strain in DF compared to [10 1 ¯ 0] prismatic orientation grains. Two types of cracking induced by strong basal slip were identified in grains with medium to high basal Schmidt factor (SF): slip transgranular cracking and basal twist grain boundary (BTGB) cracking. The slip deformation and strain evolution of the two types of cracks before and after their initiation were observed for the first time on the sample surface by in-situ dwell, which provides experimental and theoretical support for their formation mechanism. In order to constitute potential locations for crack nucleation, these regions have high local and shear strains during the basal slip stage prior to crack initiation. The higher local strain in the former is attributed to the intrusion and extrusion mechanism of the slip bands, while the latter is attributed to the inconsistency of the slip deformation of the microscopic dislocations on both sides of the BTGB making the GB slip-shear. Additionally, the incoordination on both sides of the GB, coupled with the inherently low cleavage energy, makes the BTGB more susceptible to cracking compared to slip transgranular cracking. No elemental segregation or β-phase influence was observed at the grain boundary interface. This study provides new insights into the mechanisms involved basal slip-induced cracking in Ti alloys subjected to dwell loadings.

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