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作者： Huang, Wen Yu, Hai Bo Lu, Hong Qin, Si Ji National Engieering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan University Qinhuangdao Hebei 066004 China Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University Ministry of Education of China Qinhuangdao Hebei 066004 China

ISBN: (纸本)9783038351221

The hydroforming process of differential gear box for automobile under axial compressive load and internal bulging pressure was simulated and the load paths were optimized. The hydroforming process is divided into two steps. The deformation under different load paths was investigated using dynamic explicit finite element method. The distribution of equivalent strain and thickness was investigated as well. The simulation results show that the forming path for the first step is optimal when internal pressure changes linearly from 37MPa to 65MPa with the axial displacement. © (2014) Trans Tech Publications, Switzerland.

关键词： Finite element method

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Force measurement method and analysis of guide wire in minimally invasive cardiovascular interventional surgery

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Journal of Chemical and Pharmaceutical Research 2014年第1期6卷 266-270页

作者： Yang, Xue Wang, Hongbo Wang, Qiang Wu, Jianshuang Parallel Robot and Mechatronic System Laboratory of Hebei Province China Key Laboratory of Advanced Forging and Stamping Technology and Science of Ministry of Education Yanshan University China

This paper presents a method of detecting the resistant force that acting on the guide wire when it moving into the body blood vessel for minimally invasive cardiovascular interventional surgery operated by a robot system. To learn more about the influenced factors for measured force, some simulations of body blood flow environment have been given. And then some analyses have been worked on blood flow to study whether the parameters of blood flow influence the resistant force measurement results. All of these studies will make us know more about the reliability of this force detecting method and lay the foundation for realizing force feedback in minimally invasive surgery robot system to further improve the system reliability.

关键词： Blood vessels

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Modified formula of mobility for mechanisms

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2014年 8918卷 535-545页

作者： Lu, Wenjuan Zhang, Lijie Zhang, Yitong Ma, Yalei Cui, Xiaoxu Key Laboratory of Parallel Robot and Mechatronic System Yanshan University Qinhuangdao066004 China Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University Qinhuangdao066004 China

How to determine the degree of freedom (DOF) of parallel mechanisms (PMs) and multiloop spatial mechanisms has been a long standing problem, and it still is an active field of research with plenty open questions. Firstly, three categories formulas expressed with loop-unit are introduced from a new perspective of their treatment for the motion parameter of each independent closed loop(ICL). Secondly, based on some concepts and theory of link group, the analysis provides insight into why the previous formulas do not work for some multiloop mechanisms. Then a modified formula is presented by adding an addition index called loop-redundant-rank, meanwhile the steps of estimate of mobility property are presented. Finally a typical examples is selected to calculate the DOF with the formula mentioned above. And the results coincide with the prototype data, which shows the effectiveness of the proposed method to a certain extent. It can be seen that the formula presented in this paper can do quick mobility calculation and mobility property analyses of parallel mechanisms with elementary legs. © Springer International Publishing Switzerland 2014.

关键词： Mechanisms

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Critical strain for the initiation of dynamic recrystallization in a Fe-Cr-Ni super austenitic stainless steel

Critical strain for the initiation of dynamic recrystallizat...

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2nd International Conference on Mechanics, Dynamic Systems and Material Engineering, MDSME 2014

作者： Hu, Chao Bei Guo, Bao Feng Zhang, Yong Tao Jin, Miao Ma, Ming Fang Yang, Guan Qiang Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University QinhuangdaoHebei 066004 China Shanghai Dianji University School of Mechanical Engineering Shanghai 200245 China Shanghai Heavy Machinery Plant Co. Ltd. Shanghai 200245 China

ISBN: (纸本)9783038351337

In constant strain rate tests, the occurrence of dynamic recrystallization (DRX) is traditionally identified from the presence of stress peaks in flow curves. However, not all materials display well-defined peaks when tested under these conditions. It is shown that the onset of DRX can also be identified from the inflection point on the strain hardening rate (θ = dσ/dΕ)versus flow stress (σ) curve. In this paper, the hot compression curves can be described by an equation that fits the experimental θ - σ data from zero to the peak stress. An appropriate third order equation was fitted to the strain hardening data. The results show that the critical stress at initiation σc = B /3A where A and B are coefficients of the third order equation. It is evident that this value depends on the deformation conditions. The stress-strain curve was then normalized with respect to the peak stress, leading to a normalized value of the critical stress (uc) equal to uc = σc/σp= - B′/3A′. Here A′ and B′ are coefficients of the normalized third order equation. This value is constant and independent of the deformation conditions. © (2014) Trans Tech Publications, Switzerland.

关键词： Dynamic recrystallization

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Novel Mobility Formula for Parallel Mechanisms Expressed with Mobility of General Link Group

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Chinese Journal of Mechanical Engineering 2013年第6期26卷 1082-1090页

作者： ZHANG Yitong LU Wenjuan MU Dejun YANG Yandong ZHANG Lijie ZENG Daxing Key Laboratory of Parallel Robot and Mechatronic System Yanshan University Key Laboratory of Advanced Forging & Stamping Technology and Science Yanshan University

The determination of virtual constraints is always one of the key and difficult problems in traditional mobility calculation. To make mobility calculation simple, considering avoiding virtual constraints, some new formulae have been presented, however these formulae can hardly intuitively reflect general link group＇s restrictions on output member and its influences on independence of output parameters, which is premise to the judgment of the properties of mobility. Towards the problem to reveal the intrinsic relationship between the degree of freedom（DOF） of a mechanism, the link group, and the dimension of output parameters, also to avoid determination of virtual constraint, based on the new concepts of the ＂DOF of general link group＂ and ＂node parameters＂, a new formula in the calculation of the mobility of mechanisms is presented that is expressed with DOFs of the general link groups and rank of motion parameters of base point of the output link. It is named GOM（mobility of groups and output parameter） formula. On the basis of new concepts of＂effective parameters＂ and ＂invalid parameters＂, a rule is put forward for solving the DOF of mechanisms with invalid parameters by GOM formula, that is, the base point parameters are the subset of effective parameters of link group. Thereafter, several examples are enumerated and the results coincide with the prototype data, which proves the validity of the proposed formula. Meanwhile, it is obtained that the necessary and sufficient condition for the judgment of output parameters independence is that each of the DOF of the link group is not less than zero. The proposed formula which is simple in calculation provides theoretical basis for the judgment of independence of output parameters and provides references for type synthesis of novel parallel mechanisms with independence requirements of their output parameters.

关键词： parallel mechanism degree of freedom general link group output parameters

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Numerical simulation research on stretch-bending springback of sheet metal in different loading methods

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ICIC Express Letters 2014年第6期8卷 1761-1766页

作者： Zhai, Ruixue Qian, Zhiping Zhao, Jun Key Laboratory of Advanced Forging and Stamping Technology and Science Ministry of Education Yanshan University No. 438 Hebei Ave. Qinhuangdao 066004 China

The research on springback is always the difficulty in the field of stretchbending processing. The 3D finite element model of sheet metal stretch-bending was established based on the finite element simulation software ABAQUS, in order to investigate the influence of different loading methods, bending radius and tension on the springback. When the bending radius was 150mm, 300mm and 450mm, the numerical simulations were performed respectively in the loading method of stretching-after-bending and bending-after-stretching. The relationships among residual radius of sheet metal after springback, tension and bending radius were obtained. The springback laws in the two loading methods were compared. © 2014 ISSN 1881-803X.

关键词： Sheet metal

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Static Recrystallization Behavior of 316LN Austenitic Stainless Steel

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Journal of Iron and Steel Research International 2013年第11期20卷 67-72页

作者： JIN Miao LU Bo LIU Xin-gang GUO Huan JI Hai-peng GUO Bao-feng Key Laboratory of Advanced Forging and Stamping Technology and Science of Ministry of Education Yanshan University

The static recrystallization of 316LN austenitic stainless steel was studied by double-pass hot compression tests on a Gleeble 3500 thermomechanical simulator. The specimens were compressed at the deformation tempera- tures of 950, 1050, 1150 ℃, strain rates of 0.01, 0.1, 1 s^- 1, strains of 0.1, 0.15, 0.2, and intervals of 1-100 s. The results show that the volume fraction of static recrystallization of 316LN increases with the increase of deforma- tion temperature, strain rate, strain and interval, which indicates that static recrystallization occurs easily under the conditions of higher deformation temperature, higher strain rate and larger strain. Deformation temperature has sig- nificant influence on static recrystallization of 316LN. The volume fraction of static recrystallization could easily reach 1000% at higher deformation temperatures. By microstructure analysis, it can be concluded that the larger the volume fraction of static recrystallization, the more obvious the grain refinement. The static recrystallization activation energy of 317 882 J/mol and the exponent n of 0.46 were obtained. The static recrystallization kinetics was established. The predicted volume fraction of static recrystallization is in good agreement with the experimental results.

关键词： static recrystallization austenitic stainless steel hot deformation

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Researches on the flue gas desulfurization gypsum mold formula used for the non-mold casting 71

Researches on the flue gas desulfurization gypsum mold formu...

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71st World Foundry Congress: advanced Sustainable Foundry, WFC 2014

作者： Wang, Yongwei Shan, Zhongde Zhang, Xuping Rong, Wenjuan School of Materials Science and Engineering China University of Mining and Technology No.1 Da Xue Road JiangSu XuZhou China State Key Laboratory of Advanced Forming Technology and Equipment China Academy of Machinery Science and Technology No.18 Xue Qing Road Haidian District Beijing China

ISBN: (纸本)9788461700875

Most The traditional plaster mold casting adopts the natural gypsum, rarely uses flu gas desulfurization (FGD) gypsum. In this paper, FGD gypsum is used as the main mold material, adding quartz powder, high bauxite and glass fiber as filler Samples of the basic performances were tested through the orthogonal test, the optimal formulation was selected after comprehensive comparison. the basic properties of the formula are improved by adding additives such as water reducing agent, retarder and deforming agent, the end formula to meet the no-no-mouldmould casting was obtained. Copyright 2014 World Foundry Organization.

关键词： Foundries

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Differential evolution based quantum genetic algorithm and its application

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Journal of Computational Information Systems 2014年第1期10卷 1-8页

作者： Jiang, Wanlu Zhang, Sheng Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Key Laboratory of Advanced Forging and Stamping Technology and Science Ministry of Edu. of China Yanshan University Qinhuangdao 066004 China

In the traditional quantum genetic algorithm, the rotation angle and direction of the quantum rotation gate should be looked up from the lookup table which has been designed according to the specific problem. However, this way to solve optimization problems has strong pertinence and poor efficiency so as to miss the global optimal value. For overcome this drawback, the rotation angle and the direction of the quantum rotation gate is determined with the differential evolution algorithm instead, which is a high-efficiency and adaptable evolutionary algorithm. The improved algorithm is applied to solve the function optimization problem, and the numerical results indicate that the improved algorithm has more efficiency and the stronger global optimal capacity. The improved algorithm can be used to optimize the rolling schedule of the tandem cold rolling mills, and the experiment demonstrates that the quantum genetic algorithm based on the differential evolution algorithm is an effective and feasible intelligence method for rolling schedule optimization. Copyright © 2014 Binary Information Press.

关键词： Table lookup

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Correlation between Zener-Hollomon parameter and DRX critical parameters of a Fe-Cr-Ni super austenitic stainless steel during hot deformation

Correlation between Zener-Hollomon parameter and DRX critica...

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4th International Conference on Engineering Materials, Energy, Management and Control, MEMC 2014

作者： Hu, Chao Bei Guo, Bao Feng Zhang, Yong Tao Jin, Miao Yang, Guan Qiang Ma, Ming Fang Key Laboratory of Advanced Forging and Stamping Technology and Science Ministry of Education Yanshan University Qinhuangdao Hebei 066004 China Shanghai Dianji University School of Mechanical Engineering Shanghai 200245 China Shanghai Heavy Machinery Plant Co. Ltd. Shanghai 200245 China

ISBN: (纸本)9783038351610

Calculation of the critical condition for the initiation of DRX is of considerable interest for the modeling of industrial processes but it strongly depends on the chemical composition of the material, the grain size prior to deformation, and the deformation conditions (T and Ε). This paper was therefore to show an approach that allows for accurate but convenient identification of the occurrence of DRX. For a Fe-Cr-Ni super stainless steel, the results show that there is a linear relationship between σc and lnZ (σc = 457.26 - 12.52lnZ). In addition, within the entire range of temperature and strain rate studied, it can be found that the values of both σc, and σp, or Εc, and Εpkeep similar variation trends, respectively. Finally, it was found that the critical ratios of both σc/σp and Εc/Εp remain fairly constant (≈0.92 and ≈0.47, respectively). © (2014) Trans Tech Publications, Switzerland.

关键词： Strain rate

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