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Principle of Multi-roller Straightening Process and Quantitative Resolutions of Straightening Strategies

Journal of Iron and Steel Research International 2014年第9期21卷 823-829页

作者： Jing YIN Jun ZHAO Shi-yan WANG Xian-song WAN Yue-lin LI College of Mechanical Engineering Ningbo University of Technology Key Laboratory of Advanced Forging and Stamping Technology and Science(Yanshan University) Ministry of Education of China CISDI R&D Co. Ltd.

The multi-roller straightening process of section steel is analyzed by the springback theory of small curva- ture plane bending. The theoretical analysis results prove the curvature unification in straightening process and clear- ly reveal the principle of the multi-roller straightening process. The principle can be described as~ the initial curva- tures are reduced by several times anti-bendingl meanwhile the initial curvature differences are diminished and the residual curvatures are unified~ finally, the member after curvature unification is straightened by the last anti-ben- ding. With the plastic region ratios becoming larger, the initial curvatures are more easily unified in straightening process. Based on the plastic region ratios and the required number of roller systems for unifying the initial curva- tures, the large deformation straightening strategy and the small deformation straightening strategy are redefined. The new definition provides an important theoretical basis for setting reliable reduction rules. Through the theoretical analysis results, a new straightener design philosophy is proposed to improve the straightening quality and further increase the adjustment precision as well as the flexibility of the last roller system. The adjustable end roller emerges as the times required, achieving a good effect in practical application.

关键词： section steel multi-roller straightening curvature unification plastic region ratio straightening strategy

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Process of back pressure deep drawing with solid granule medium on sheet metal

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Journal of Central South University 2014年第7期21卷 2617-2626页

作者：董国疆赵长财曹秒艳 College of Vehicles and Energy Yanshan University Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education of China (Yanshan University) National Engineering Research Center for Equipment and Technology of Cold Strip Rolling (Yanshan University)

The experimental die apparatus of the solid granules medium forming on sheet metal was designed and *** parts,such as conical,parabolic,cylindrical and square-box-shaped components,were successfully trial-produced as *** to the analysis of the changing trends of the cross-section shape and the wall thickness during the process,it can be found that the shape of the free deformation zone of the sheet metal,which is the most critical thinning area,can be described as an approximately spherical *** to this forming feature,back pressure deep drawing technology with solid granules medium on sheet metal was proposed to restrain drastic thinning at the bottom of the part through the joint friction effect of solid granules medium,the back pressure tringle and the sheet ***,the deep drawing limit of the sheet metal is significantly *** order to fabricate thin-walled rotary parts with great drawing ratio and complex cross-sections,a finite element model based on the material property test of the solid granules medium was established to optimize the scheme of the back pressure deep *** effects on the forming performance of sheet metal from back pressure load and the approach of blank holding control were analyzed through this model.

关键词： solid granules medium forming drawing sheet metal finite element simulation

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Effect of temperature on the dispersion of graphene in graphene reinforced aluminum matrix composite 4

Effect of temperature on the dispersion of graphene in graph...

引用

2020 4th International Conference on Material science and technology, ICMST 2020

作者： Wang, Qiang Sun, Qingze Chen, Shengyong Key Laboratory of Advanced Forging and Stamping Technology and Science of Ministry of Education Yanshan University Qinhuangdao066004 China

The influence of hot pressing temperature on the dispersion of graphene (GR) in GR reinforced aluminum matrix composites was investigate. The micro structure s of the sample were observed by optical microscope, scanning electron microscopy and energy dispersion spectrum, respectively. The temperature is hold at 640-750°C, and the interval is 10°C. The results show that GR is mainly distributed at the grain boundary at 640°C. And GR is dispersed in the aluminum matrix, without obvious agglomeration at the temperature from 670°C to 680°C. However, GR is agglomerated in the aluminum matrix and has obvious regional differentiation at 690-750°C, in which the concentrated area of GR is in the middle of the sample, and the dilution area in the rest. © 2020 Institute of Physics Publishing. All rights reserved.

关键词： Graphene

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Configuration Synthesis and Lightweight Networking of Deployable Mechanism Based on a Novel Pyramid Module

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Chinese Journal of Mechanical Engineering 2023年第4期36卷 294-310页

作者： Jinwei Guo Jianliang He Guoxing Zhang Yongsheng Zhao Yundou Xu School of Mechanical Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan UniversityQinhuangdao 066004China Key Laboratory of Advanced Forging and Stamping Technology and Science of Ministry of National Education Yanshan UniversityQinhuangdao 066004China

Deployable mechanism with preferable deployable performance,strong expansibility,and lightweight has attracted much attention because of their potential in aerospace.A basic deployable pyramid unit with good deployability and expandability is proposed to construct a sizeable deployable ***,the basic unit folding principle and expansion method is *** configuration synthesis method of adding constraint chains of spatial closed-loop mechanism is used to synthesize the basic ***,the degree of freedom of the basic unit is analyzed using the screw theory and the link dismantling ***,the three-dimensional models of the pyramid unit,expansion unit,and array unit are established,and the folding motion simulation analysis is carried *** on the number of components,weight reduction rate,and deployable rate,the performance characteristics of the three types of mechanisms are described in ***,prototypes of the pyramid unit,combination unit,and expansion unit are developed to verify further the correctness of the configuration synthesis based on the *** proposed deployable mechanism provides aference for the design and application of antennas with a large aperture,high deployable rate,and *** has a good application prospect in the aerospace field.

关键词： Pyramid unit Deployable mechanism Configuration synthesis Structural design Lightweight networking

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Research on double differential pressure dynamic flowmeter

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High technology Letters 2019年第4期25卷 378-385页

作者： Liu Tao Zuo Zhibing Yin Zhigang Hebei Province Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan UniversityQinhuangdao 066004P.R.China Key Laboratory of Education Ministry for Advanced Forging Press Technology and Science Yanshan UniversityQinhuangdao 066004P.R.China

When testing an electrohydraulic proportional valve,it is necessary to test the high frequency dynamic flow with *** of the limitation of the piston stroke,a no-load hydraulic cylinder is only suitable for a reciprocating symmetrical dynamic flow *** the traditional differential pressure flowmeter is affected by viscosity and inertia of the fluid,it is only suitable for measuring steady ***,a new type of double pressure differential dynamic flowmeter is designed to improve the traditional differential pressure *** influence of fluid viscosity and inertia in the flow process are negated by subtracting the differential pressure in section expansion from the differential pressure in section *** double differential pressure flowmeter is modeled and a flow meter prototype is ***,the flow coefficients are identified and corrected by a practical ***,the dynamic performance and steady-state precision of the flowmeter are verified by comparing with the test results of the no-load hydraulic *** double differential pressure dynamic flowmeter is proven to measure dynamic flow accurately,especially at higher dynamic frequencies.

关键词： dynamic flowmeter double differential pressure contrast experiment coefficient correction

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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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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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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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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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Effect of axial preloading on mechanical behavior during the free-end torsion of an extruded AZ31 magnesium alloy

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International Journal of Minerals,Metallurgy and Materials 2022年第7期29卷 1351-1360页

作者： Qun Li Dan Meng Zhichang Fu Hui Zhao Chong Yang Yan Peng Baodong Shi Key Laboratory of Advanced Forging&Stamping Technology and Science of Ministry of Education School of Mechanical EngineeringYanshan UniversityQinhuangdao 066004China National Engineering Research Center for Equipment and Technology of Cold Rolled Strip School of Mechanical EngineeringYanshan UniversityQinhuangdao 066004China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China

Large plastic deformation commonly occurs during the practical forming process in *** with uniaxial tension/compression,torsion is a more effective approach to investigate mechanical behavior under large *** response of the large strain torsion of magnesium alloy is sensitive to the initial texture and ***,an extruded AZ31 alloy was pre-stressed in tension and compression to introduce dislocations and twins in the current ***,torsion tests were conducted to clarify the effects of twinning and dislocation on subsequent deformation *** corresponding microstructure and deformation mechanisms were explored on the basis of viscoplastic self-consistent(VPSC)*** experimental observations on stress-strain responses and pole figures were captured by simulation *** was found that twins make less contribution to plastic deformation,which results in small change in texture direction under pure torsion and torsion after *** activity of the slip/twin system and the mechanical properties are affected by different initial textures and active conditions of the ***,the stress state during combined tension-torsion loading benefits the reduction of texture intensity.

关键词： magnesium alloy torsion twinning dislocation texture viscoplastic self-consistent

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