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CSAA/IET International Conference on Aircraft Utility Systems, AUS 2018

作者： Yuan, Xiaoming Zhao, Shiyi Wang, Chu Zhang, Lijie Hebei Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University Qinhuangdao China

ISBN: (纸本)9781785617911

To improve the jet performance of a fire water monitor, the monitor head with three different inner contour lines were designed. Based on FLUENT, the calculation domain was defined geometrically and then the cloud pictures of the flow velocity, pressure, turbulence kinetic energy and multiphase flow of the fluid field in the nozzle and jet were obtained, based on which the optimal structure of each model can be selected. The simulation result can provide the theoretical reference for the design of a monitor head. © 2018 IET Conference Publications. All rights reserved.

关键词： Flow velocity

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Effect of metal layer material properties on the metal laminate wrinkle resistance

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Engineering Failure Analysis 2025年 177卷

作者： Bing Du Xingze Zhen Fenghua Liu Chaoyang Huang Ziwei Feng Hailong Cui Mingxin Dong National-Local Joint Engineering Research Center for Advanced Manufacturing Forming Technology and Equipment Yanshan University Qinhuangdao City China Key Laboratory of Advanced Forging & Stamping Technology and Science (Yanshan University) Ministry of Education of China Qinhuangdao City China Hebei Engineering Technology Research Center of Metal Precision Plastic Processing Yanshan University Qinhuangdao City China

Metal laminates are prone to wrinkling in the plastic forming, and the mechanical response differences between different metal layers lead to the complexity of the wrinkling mechanism. However, understanding how these differences affect wrinkle resistance can improve the laminate anti-wrinkle properties. Therefore, this study established evaluation indicators for wrinkle resistance based on macroscopic morphological characteristics using the Yoshida Buckling test and the finite element method. Furthermore, the influence of material parameters of different metal layers (including elastic modulus E , Poisson ratio μ , strength coefficient K , and hardening index n ) on the laminate wrinkle resistance was analyzed. The study indicates that increasing the parameters E , μ, and K or decreasing n can enhance the overall wrinkle resistance on metal laminates. In addition, orthogonal test methods further reveal the sensitivity of each parameter to wrinkle resistance. The results demonstrate that the material properties of the base layer exhibit higher sensitivity to wrinkling resistance than those of the cladding layer. The sensitivity hierarchy follows n > K > E > μ . At the same time, the optimal parameter combination for wrinkle resistance is obtained. The research result provides a theoretical basis and guidance for the optimal design and manufacture of metal laminates.

关键词： Surface properties

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Stress-strain analysis on AA7075 cylindrical parts during hot granule medium pressure forming

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Journal of Central South University 2016年第11期23卷 2845-2857页

作者：董国疆杨卓云赵建培赵长财曹秒艳 College of Vehicles and Energy Yanshan University Qinhuangdao 066004 China Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education of China (Yanshan University) Qinhuangdao 066004 China National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan University Qinhuangdao 066004 China

Hot granule medium pressure forming(HGMF) is a technology in which heat-resistant granules are used to replace liquids or gases in existing flexible-die forming technology as pressure-transfer medium. Considering the characteristic of granule medium that seals and loads easily, the technology provides a new method to realize the hot deep-drawing forming on high strength aluminum alloy sheet. Based on the pressure-transfer performance test of granule medium and the material performance test of AA7075-T6 sheet, plastic mechanics analysis is conducted for the areas, such as the flange area, force-transfer area and free deforming area, of cylindrical parts deep-drawn by HGMF technology, and the function relation of forming pressure is obtained under the condition of nonuniform distribution of internal pressure. The comparison between theoretical result and experimental data shows that larger deviation occurs in the middle and later period of forming process, and the maximum theoretical forming force is less than the experimental value by 24.6%. The variation tendency of the theoretical thickness curve is close to the practical situation, and the theoretical value basically agrees well with experimental value in the flange area and the top area of spherical cap which is in the free deforming area.

关键词： granule medium aluminum alloy sheet deep-drawing hot forming limit drawing ratio

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Investigation on the microstructures and tensile properties of TA15 titanium alloy thick-wall parts formed by laser rapid forming process

Investigation on the microstructures and tensile properties ...

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2012 International Conference on Advances in Materials science and Engineering, AMSE 2012

作者： Xi, Mingzhe Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University Ministry of Education of China Qinhuangdao City 066004 Hebei Province China

ISBN: (纸本)9783037855997

TA15 titanium alloy thick-wall parts have been deposited by Laser rapid forming (LRF) process. In this paper, a new overlap method between two adjacent laser tracks has been used to deposit the thick-wall titanium part. Results showed that the LRFed thick-wall titanium part was good in shape by using the new overlap method. The microstructure of the LRFed titanium alloy primarily consists of columnar prior-beta grain, which is perpendicular to the substrate resulting from directionally solidification. It also could be observed that the size of alpha phase increased with increasing laser power and decreasing scanning velocity. Tensile properties of LRFed titanium was slightly lower than that of the wrought annealed TA15 titanium alloy, after the heat-treatment of 940°C/1h/AC, the heat-treated titanium alloy showed good tensile properties which were equivalent to that of the wrought annealed TA15 titanium alloy. © (2013) Trans Tech Publications, Switzerland.

关键词： Microstructure

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Simulation on the transient thermal stress field of the wall-shaped part deposited by laser direct metal powder deposition

Simulation on the transient thermal stress field of the wall...

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2012 International Conference on Biomaterial and Bioengineering, ICBB 2012

作者： Xi, Mingzhe Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University Ministry of Education of China Qinhuangdao City 066004 Hebei Province China

ISBN: (纸本)9783037855973

A thermo-kinetic model for the transient thermal stress field of the wall-shaped part produced using laser direct powder deposition process is developed. In case of numerical modeling, the capabilities of ANSYS parametric design language and the the 'birth and death' element technique were employed. The distribution of the thermal stress of the wall-shaped part at different time was calculated by the model. Results show that during process, the X-direction thermal stress within top layer of the wall-shape part and that within the interior deposited layers of the wall-shape part was tensile stress and compressive stress, respectively. The deformation of the wall-shaped part and base plate was also calculated. © (2013) Trans Tech Publications, Switzerland.

关键词： Finite element method

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Tailored properties of a novelly-designed press-hardened 22MnMoB steel

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Journal of Iron and Steel Research International 2017年第5期24卷 508-512页

作者： Ming-bo Zhou Jing-lin Tang Jie Yang Cun-yu Wang Key Laboratory of Advanced Forging & Stamping Technology and Science (Yanshan University) Ministry of Education of China Qinhuangdao 066004 Hebei China Lightweight Research Department Society of Automotive Engineers of China Beijing 100055 China Central Iron & Steel Research Institute Beijing 100081 China

A novel 22MnMoB hot stamping steel was designed. The continuous cooling transformation （CCT） measurement of the 22MnMoB steel showed that the ferrite-bainite microstructure could be obtained at cooling rates lower than 25 ℃/s, and the complete martensite structure required the cooling rate higher than 30 ℃/s. The experiments with non-uniform die temperatures were carried out to obtain tailored properties. The results showed that strength of 1 411 MPa and elon- gation of 6% could be obtained in the hard zone, and strength of 916 MPa and elongation of 9% could be obtained in the soft zone, which can be realized by controlling the die temperature at 400 ℃. The transition zone was found smooth and could be beneficial to reduce the stress concen tration and therefore improve the performance of components.

关键词： Hot stamping Bainite Tailored property Mechanical property Microstructure

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Finite element simulation and microstructure of two-pass inner spinning process of curved-generatrix cone cylindrical parts with annealing/quenching

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Journal of Central South University 2019年第12期26卷 3305-3314页

作者： HAO Zeng-liang YANG Zhe-yi) WEI Wei LIU Lei LUO Jun-ting LIU Jin-heng Key Laboratory of Advanced Forging&Stamping Technology and Science of Ministry of Education Yanshan UniversityQinhuangdao 066004China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China Hebei Construction Material Vocational and Technical College Qinhuangdao 066000China

A two-pass annealing/quenching internal spinning process with small-end rotations is proposed to form a curved generatrix conical thin-walled *** is,annealing at 360°C for 2 h followed by the 1st pass spinning,and finally quenching in ice water after holding for 1 h at 498°C followed by the 2nd pass *** finite element software is used to simulate the internal spinning process of the products formed under different forming *** distribution laws of spinning force,the stress and strain under different forming processes were compared and *** mechanical properties and microstructure of the products are subsequently *** results show that the strain and the residual stress in the skin area of the formed products under two-pass spinning process more uniform,and the hardness and the mechanical performance are *** microstructure of the products formed with the 0.15 mm thickness reduction at the 2nd pass is *** the second phase grain size distributed uniformly in the range of 36μ***,the second phase particles are broken seriously and the size distribution inhomogeneity is increased when the thickness reduction in the skin area is greater than 0.20 mm at the 2nd pass spinning process.

关键词： curved generatrix conical internal spinning process annealing/quenching small-end rotations finite element simulation

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Co-simulation technology of casting-forging combination forming process for grain distribution prediction

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Cailiao Daobao/Materials Review 2017年第1期31卷 150-154页

作者： Wang, Wei Ma, Rui Zhao, Jun Zhai, Ruixue Key Laboratory of Advanced Forging & Stamping Technology and Science Yanshan University Qinhuangdao066004 China

A co-simulation technology of casting-forging combination forming process was developed. Initial nonuniform cas-ting grain size was obtained from CAFE module of ProCAST software by casting simulation. A Fortran program was compiled as a function module of Deform-3D software to establish the coupling between the initial nonuniform casting grain size distribution and the Deform-3D forging model. The simulation of microstructure evolution during the forging process was realized though the secondary development of Deform-3D software. Finally, the distribution of dynamic recrystallized grain size and dynamic recrystallization vo-lume fraction could be predicted. The casting-forging combination forming of the cutting pick body was simulated by the developed co-simulation technology. The distribution of dynamic recrystallized grain size and dynamic recrystallization volume fraction of the two models, one model with initial uniform grain size, another with initial nonuniform grain size form the casting simulation, were acquired respectively. The feasibility of co-simulation technology of casting-forging combination forming process for grain distribution prediction was proved by the comparison result analysis. © 2017, Materials Review Magazine. All right reserved.

关键词： Forecasting

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Densification,microstructural features and tensile properties of selective laser melted AlMgSiScZr alloy from single track to block specimen

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Journal of Central South University 2021年第4期28卷 1129-1143页

作者： BI Jiang CHEN Yan-bin CHEN Xi STAROSTENKOV M D DONG Guo-jiang Key Laboratory of Advanced Forging&Stamping Technology and Science of Ministry of Education Yanshan UniversityQinhuangdao 066004China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China General Physics Department Polzunov Altai State Technical UniversityBarnaul 656038Russia

The selective laser melting(SLM)processed aluminum alloys have already aroused researchers’attention in aerospace,rail transport and petrochemical engineering due to the comprehensive advantages of low density,good corrosion resistance and high mechanical *** this paper,an Al-14.1Mg-0.47Si-0.31Sc-0.17Zr alloy was fabricated via *** characteristics of single track at different process parameters,and the influence of hatch spacing on densification,microstructural features and tensile properties of block specimens were systematically *** hatch spacing has an influence on the overlap ratio of single track,and further affects the internal forming quality of printed *** a laser power of 160 W and scanning speed of 400 mm/s,the densification of block specimen increased first and then decreased with the increase of hatch *** nearly full dense specimen(98.7%)with a tensile strength of 452 MPa was fabricated at a hatch spacing of 80μ*** characteristics of dimple and cleavage on the tensile fracture of the AlMgSiScZr alloy showed the mixed fracture of ductility and brittleness.

关键词： selective laser melting aluminum alloy hatch spacing microstructural feature tensile properties

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Influence of structure parameters on the permanent magnetic planetary gear forced vibration frequency response 4

Influence of structure parameters on the permanent magnetic ...

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4th International Conference on advanced Design and Manufacturing Engineering, ADME 2014

作者： Zhu, Xue Jun Xu, Li Zhong Yanshan Hebei Provincial Key Laboratory of Parallel Robot and Mechatronic System Yanshan University Qinhuangdao China Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University Qinhuangdao China

ISBN: (纸本)9783038352570

The time and frequency forced responses for the permanent magnetic planetary gear drive were computed and analyzed. The influence of magnetization intensity and pole pair number to frequency forced responses is discussed. Results show that the dynamic displacement when only considering output excitation is larger than that when only considering input excitationand magnetic parameters have obvious effects on the low frequency vibration amplitude of elements. When magnetization intensity and pole pair number are too large or too small, they will seriously affect the dynamic performance of the system. So, selecting rational system structure parameters is very important, which can avoid system elements generating larger vibration. © (2014) Trans Tech Publications, Switzerland.

关键词： Frequency response

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