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Multi-point flexible straightening process by reciprocating bending for metal profiles

Transactions of Nonferrous Metals Society of China 2021年第7期31卷 2039-2050页

作者： Xue-ying HUANG Jun ZHAO Gao-chao YU Qing-dang MENG Zhen-kai MU Yan-jun LIU Key Laboratory of Advanced Forging&Stamping Technology and Science Ministry of EducationYanshan UniversityQinhuangdao 066004China College of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China

A multi-point flexible straightening process characterized by reciprocating bending is ***,the process is analyzed in terms of deformation mechanism and verified by numerical simulations and physical experiments of the straightening of a series of metal profiles with different materials and initial ***,the relationship between the bending radius and the times of reciprocating bending required to unify the curvature is discussed,and the distribution of residual stress after straightening is *** results show that the reciprocating bending process can eliminate the difference of the initial curvature,make the curvature of each section tend to be uniform;the times of reciprocating bending to reach the uniform curvature decreases with the decrease of bending *** straightness of the straightened profile obtained from the experiment and simulation is less than 0.2%,demonstrating a good feasibility of this method.

关键词： multi-point flexibility metal profile reciprocating bending curvature unification over-bending straightening straightness

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High temperature stress–strain curves of MnS and their applications in finite element simulation

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Transactions of Nonferrous Metals Society of China 2018年第10期28卷 2082-2093页

作者： Miao JIN Lin-lin YU Xin-gang LIU Bao-feng GUO Key Laboratory of Advanced Forging&Stamping Technology and Science Ministry of EducationYanshan UniversityQinhuangdao 066004China School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China

A novel method for testing stress–strain curves of non-metallic materials was *** high temperature stress-strain curves of MnS were preliminarily obtained and corrected to account for the influence of *** the finite element method,the influence of deformation parameters on the deformation evolution of MnS inclusions was investigated based on the experimental reference *** corresponding physical experiment was designed for comparative *** results indicate that the experimental high-temperature deformation data of MnS are highly *** the process of matrix deformation,the shapes of MnS inclusions change from spherical to ellipsoidal and even to *** are some differences in the morphological deformation of MnS inclusions located at different *** the increase in the initial size of MnS inclusions,the risk of failing the inclusion-flaw inspection increases and the forging quality further deteriorates.

关键词： inclusion MnS stress-strain curve finite element method morphology

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Dynamic Topology Multi Force Particle Swarm Optimization Algorithm and Its Application

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Chinese Journal of Mechanical Engineering 2016年第1期29卷 124-135页

作者： CHEN Dongning ZHANG Ruixing YAO Chengyu ZHAO Zheyu Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University Qinhuangdao 066004 China Key Laboratory of Advanced Forging & Stamping Technology and Science (Yanshan University) Ministry of Education of China Qinhuangdao 066004 China Hebei Provincial Key Laboratory of Industrial Computer Control Engineering Yanshan University Qinhuangdao 066004 China

Particle swarm optimization （PSO） algorithm is an effective bio-inspired algorithm but it has shortage of premature convergence. Researchers have made some improvements especially in force rules and population topologies. However, the current algorithms only consider a single kind of force rules and lack consideration of comprehensive improvement in both multi force rules and population topologies. In this paper, a dynamic topology multi force particle swarm optimization （DTMFPSO） algorithm is proposed in order to get better search performance. First of all, the principle of the presented multi force particle swarm optimization （MFPSO） algorithm is that different force rules are used in different search stages, which can balance the ability of global and local search. Secondly, a fitness-driven edge-changing （FE） topology based on the probability selection mechanism of roulette method is designed to cut and add edges between the particles, and the DTMFPSO algorithm is proposed by combining the FE topology with the MFPSO algorithm through concurrent evolution of both algorithm and structure in order to further improve the search accuracy. Thirdly, Benchmark functions are employed to evaluate the performance of the DTMFPSO algorithm, and test results show that the proposed algorithm is better than the well-known PSO algorithms, such as gPSO, MPSO, and EPSO algorithms. Finally, the proposed algorithm is applied to optimize the process parameters for ultrasonic vibration cutting on SiC wafer, and the surface quality of the SiC wafer is improved by 12.8% compared with the PSO algorithm in Ref. [25]. This research proposes a DTMFPSO algorithm with multi force rules and dynamic population topologies evolved simultaneously, and it has better search performance.

关键词： force rule MFPSO algorithm FE topology DTMFPSO algorithm parameter optimization

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Study on co-simulation model of forging manipulator based on virtual prototyping

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High technology Letters 2016年第2期22卷 128-134页

作者：翟富刚 Zhu Hanyin Wu Qilei Kong Xiangdong School of Mechanical Engineering Yanshan University Key Laboratory of Advanced Forging & Stamping Technology and Science(Yanshan University) Ministry of Education of China Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University

Based on the characteristics of integrated virtual prototype technology, the mechanical system sub-model, the hydraulic system sub-model and the control system sub-model of a forging manipula- tor system have been built using a variety of software, and a forging manipulator mtrltidisciplinary co- simulation model has been also built using a method of simulation models interface. Then the simu- lation and experiment are finished, and the result of the experiment is in good agreement with the re- sult of the simulation. It shows that the co-simulation model established can simulate accurately pa- rameter changes in real time during the moving of the forging manipulator such as displacement, ve- locity and pressure flow, which is of important significance for the optimized design of the forging manipulator system to establish the models.

关键词： forging manipulator virtual prototype co-simulation control characteristics

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Three-roller continuous setting round process for longitudinally submerged arc welding pipes

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Transactions of Nonferrous Metals Society of China 2021年第5期31卷 1411-1426页

作者： Xue-ying HUANG Jun ZHAO Gao-chao YU Qing-dang MENG Zhen-kai MU Rui-xue ZHAI Key Laboratory of Advanced Forging&Stamping Technology and Science Ministry of Education of ChinaYanshan UniversityQinhuangdao 066004China School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China

In order to solve the problems of excess ovality and cross-section distortion of longitudinally submerged arc welding pipes after forming,a new three-roller continuous setting round process was *** process can be divided into three stages:loading stage,roll bending stage and unloading *** on the discretization idea,the mechanical model of the primary statically indeterminate problem of the longitudinally submerged arc welding pipes at the roll bending stage was established,and the deformation response was *** simulation and theoretical results show that there are three positive bending regions and three reverse bending regions along the circumference of the *** loading force of each roller shows growth,stability and downward trend with *** error between the theoretical fitting curve and the simulated data point is very small,and the simulation results verify the reliability of the theoretical *** experimental results show that the residual ovality decreases with the increase of the reduction,and the reduction of the turning point is the optimum *** addition,the residual ovality of the pipe is less than 0.7%without cross-section distortion,which verifies the feasibility of this process.

关键词： longitudinally submerged arc welding pipes three-roller continuous setting round statically indeterminate problem mechanical model ovality optimum reduction

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Comparative study on forming limit prediction of AA7075-T6 sheet with M−K model and Lou−Huh criterion

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Transactions of Nonferrous Metals Society of China 2020年第6期30卷 1463-1477页

作者： Guo-jiang DONG Zhi-wei CHEN Zhuo-yun YANG Bo-cheng FAN Hebei Key Laboratory of Special Delivery Equipment Yanshan UniversityQinhuangdao 066004China Key Laboratory of Advanced Forging&Stamping Technology and Science of Ministry of Education of China Yanshan UniversityQinhuangdao 066004China

In order to effectively predict the fracture of AA7075-T6 sheet, the forming limit curves of AA7075-T6 high-strength sheet were drawn according to Morciniak Kuczyski (M K) model and Lou Huh criterion, respectively. The errors between the predicted values of the two theoretical prediction models and experimental values were calculated by error analysis. The forming limit curves were verified by the punch stretch test to evaluate the prediction accuracy of M K model and Lou Huh criterion. The error analysis results show that the mean error of Lou Huh criterion with the optimal parameters for all tensile specimens is 25.04%, while the mean error of M K model for all tensile specimens is 74.24%. The prediction accuracy of Lou Huh criterion in predicting the fracture of AA7075-T6 sheet is higher. The punch stretch test results show that the forming limit curve drawn by Lou Huh criterion can effectively predict the fracture of AA7075-T6 sheet, but the prediction accuracy of M K model is relatively poor.

关键词： ductile fracture criterion M K model forming limit diagram AA7075-T6 sheet

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Adaptive friction compensation for large diameter electro-hydraulic proportional valve cores based on LuGre

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High technology Letters 2015年第4期21卷 371-378页

作者：孔祥东 Song Yu Ai Chao Li Yanpeng Tian Dezhi Key Laboratory of Advanced Forging & Stamping Technology and Science(Yanshan University) Ministry of Education of China Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University School of Mechanical Engineering Yanshan University

This paper presents an adaptive friction compensation method based on LuGre model for large diameter electric-hydraulic proportional valves in which the valve core contains friction.A mathematic model of the electric-hydraulic proportional valve is established,and the friction characteristics are described based on the LuGre *** global asymptotic stability of the control system with the adaptive friction compensation controller is guaranteed over Lyapunov *** adaptive compensation of the friction on LuGre friction model is verified by simulation and *** steady-state error is about [-4.23 × 10^(-5)m,5.91 × 10^(-5)m]and[-2.5 × 10^(-4)m,2.6 ×10^(-4) m] on simulation and experiment,the position tracking accuracy is higher,and the lag time of the main valve through the dead zone is *** result proves that the adaptive friction compensation method can effectively compensate for the negative effects of nonlinear friction.

关键词： electric-hydraulic proportional valve pilot stage LuGre adaptive friction com- pensation experimental identification

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Microstructure,mechanical properties and multiphase synergistic strengthening mechanisms of a novel laser additive manufactured AlNi6TiZr alloy

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Journal of Materials science & technology 2024年第11期178卷 59-69页

作者： Jiang Bi Liukun Wu Zeqi Liu Haixiang Wang Shide Li Ji Wang Zhuoyun Yang Nannan Lu Xi Chen Mikhail Dmitrievich Starostenkov Guojiang Dong Key Laboratory of Advanced Forging&Stamping Technology and Science of Ministry of Education Yanshan UniversityQinhuangdao 066004China CITIC Dicastal Co. Ltd.Qinhuangdao 066004China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001China General Physics Department Altai State Technical UniversityLeninist.46Barnaul 656099Russia

In this work,selective laser melting(SLM)process is used to prepare the AlNi6TiZr *** analyzing the printing quality and mechanical properties of the printed specimens with different process parameters,the SLM forming window of AlNi6TiZr is *** relative density of the sample printed with 270 W-1100 mm/s(laser energy density:82 J/mm3)reaches 99.7%,exhibiting excellent mechanical properties(yield strength(YS):421.7 MPa;ultimate tensile strength(UTS):480.4 MPa).After an aging treatment of 325 ℃-12 h,the YS and UTS of the sample increased to 494 MPa and 550.7 MPa,*** Ni,Ti,and Zr components promoted the generation of multi-phase precipitates in the Al alloy and improved the synergistic strengthening effect of *** hard-shell structure(HSS)formed by the Al_(3)Ni phase at the grain boundary significantly strengthened the grain boundary *** precipitated Al_(3)(Ti,Zr)phases at the grain boundaries prevent grain growth and dislocation *** Al_(3)Ni and Al_(3)(Ti,Zr)phases have good thermal stability that can still maintain excellent enhancement effects at high ***6TiZr alloy has great application prospects in medium and high-temperature environments.

关键词： Selective laser melting Al6NiTiZr alloy Microstructure Mechanical properties Thermal stability Strengthening mechanism

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Establishment of Sheet Plastic Wrinkling Instability WLD and Study on Strain Distribution Characteristics in Instability Region 13th

Establishment of Sheet Plastic Wrinkling Instability WLD and...

引用

13th International Conference on the technology of Plasticity, ICTP 2021

作者： Du, Bing Li, Han Xie, Jun Song, Pengfei Zhao, Changcai Key Laboratory of Advanced Forging Stamping Technology and Science Yanshan University Ministry of Education of China Qinhuangdao City066004 China

ISBN: (纸本)9783030753801

In the field of thin-plate plastic forming, the efficient and accurate prediction and control of wrinkles are the basis for product and mold design and process flow formulation. In this paper, a diagonal tensile test of a square plate is taken as an example, and a numerical simulation model for plastic wrinkle analysis of a thin plate is established by using ABAQUS. On this basis, the morphology and characteristics of the critical wrinkle main strain diagram (WLD) under the condition of nonuniform tension are investigated. The distribution position relationship between the strain value at different positions in the deformation region of the specimen and the critical wrinkle main strain curve (WLD) is discussed. The research content of this paper provides ideas for determining the wrinkle instability and establishing the wrinkle critical line under other various bearing conditions. © 2021, The Minerals, Metals & Materials Society.

关键词： Stability

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Mechanism and Inhibition of Grain Coarsening of Al-Mg-Si Alloy in Hot Forming

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Journal of Harbin Institute of technology(New Series) 2013年第3期20卷 67-74页

作者： Ying-Ping Guan Zhen-Hua Wang Bin Wu Wei-Xin Wang Wan-Tang Fu Key Laboratory of Advanced Forging & Stamping Technology and Science(Yanshan University) Ministry of Education of China College of Mechanical Engineering and Applied Electronic Technology Beijing University of Technology CITIC Dicastal Wheel Manufacturing Co. Ltd. State Key Laboratory of Metastable Materials Science and Technology Yanshan University

A high-Ti 6061 alloy was rolled with strains up to 0. 8 - 2. 0 and at 350 - 550 ℃ . Microstructures that developed during deformation and subsequent solution heat treatment (SHT) were observed by using optical and transmission electron microscopy. Microstructure evolution during SHT depends mainly on the initial rolling temperature,and it was found that the higher this temperature is,the coarser the grains are. After rolling at 400 ℃ ,well-defined cells and subgrains were formed, which induced further sites for recrystallization nucleation during subsequent SHT. The recrystallization mechanism was found to be subgrain rotation,with a final grain size smaller than 200 μm. Increasing the rolling temperature to 500 ℃ results in a low density of dislocations distributed uniformly in the deformed matrix and fewer nucleation sites during subsequent SHT. The recrystallization mechanism is grain boundary bulging,while the final grain size approaches several millimeters. Finally,a hot forming process of high-Ti 6061 alloy for inhibiting grain coarsening was proposed,and verified by experiments.

关键词： aluminum alloy grain size recrystallization nucleation mechanism

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