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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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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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Precision and Flexible Bending Control Strategy Based on Analytical Models and Data Models

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Chinese Journal of Mechanical Engineering 2022年第5期35卷 112-130页

作者： Yongchuan Duan Le Tian Fangfang Zhang Yu Liu Haidi Qiao Liu Yang Yingping Guan Key Laboratory of Advanced Forming&Stamping Technology and Science Ministry of Education of ChinaYanshan UniversityQinhuangdao 066004China College of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China

Forming of various customized bending parts,small batches,as well as numerous types of materials is a new challenges for Industry 4.0,the current control strategies can not meet the precision and flexibility requirement,expected control strategy of bending processes need to not only resist unknown interferences of process condition and models,but also produce various new parts automatically and *** this paper,a precision and flexible bending control strategy based on analytical models and data models is proposed to build adaptive bending *** analytical prediction models for loading and unloading are established and suitable for various materials,a sequential identification strategy is proposed to search nominal properties using the four sub-optimization models.A data-based feedback model is established to prevent over-bending and eliminate online *** models are merged into a precision and flexible control *** system firstly uses sub-optimization models to search the nominal point which is near to target point,secondly the system further uses feedback model to eliminate residual error between the nominal point and target *** with four kinds sheet metals,the allowable ranges for variables are determined for a good *** target bending angles were set to 20°,40°,and 60°.Forty parts were tracked for each kind material,the adaptive bending system converged after one iteration,and exhibited better performances.

关键词： Air bending Springback control Flexible bending control Feedback compensation

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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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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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Frictional characteristics of granular system under high pressure

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Journal of Central South University 2016年第5期23卷 1132-1141页

作者：曹秒艳彭雅新赵长财董国疆杜冰 national engineering research center for equipment and technology of cold strip rolling(yanshan university) Qinhuangdao 066004China Key Laboratory of Advanced Forging&Stamping Technology and Science of Ministry of Education of China(Yanshan University) Qinhuangdao 066004China College of Vehicles and Energy Yanshan UniversityQinhuangdao 066004China

In order to reveal the force transmission features of the granules in the solid granule medium forming(SGMF) technology,the frictional characteristics of the non-metallic granule medium(NGM) under high pressure were investigated by tests and *** the relevant changing curves of the internal friction coefficient of the granular system under different normal pressures were obtained by self-designed shear *** the granule volume compression test,the accurate discrete element simulation parameters were obtained,based on this,the discrete element method(DEM) was adopted to reveal the evolution law of the NGM granules movement in the sample shear process from the microscopic *** on the DEM,the influence of granule diameter,surface friction coefficient,normal pressure and shear velocity on the internal friction coefficient of the granular system were *** the parameters were conducted to be dimensionless by introducing the inertia ***,the expression showing power-law relationship of inertia coefficient,surface friction coefficient and internal friction coefficient is obtained.

关键词： granule friction coefficient discrete element method inertia coefficient

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A dynamic sintering-forging integrated method for synergetic controlling W-Ti refractory alloy with high densities, fine grains and low titanium-rich content

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Results in Physics 2025年 73卷

作者： Gao, Ka Hu, Yanghu Zhang, Zixiang Rao, Yuan Tang, Yufan Li, Qiang Sun, Dejian Gao, Yang Dang, Li Wang, Hailong Zhuo, Haiou Guo, Biao An, Linan School of Mechanical Engineering University of Shanghai for Science and Technology Shanghai 200093 China State Key Laboratory of Metal Extrusion and Forging Equipment Technology (China National Heavy Machinery Research Institute Co. Ltd) Xi'an 710000 China School of Materials Science and Engineering Zhengzhou University of Aeronautics Zhengzhou 450015 China Zhongyuan Critical Metals Laboratory Zhengzhou University Zhengzhou 450003 China Jiangxi Province Key Laboratory of Ultra-high Temperature Metal Material Nanchang University Nanchang 330031 China Key Laboratory of Materials and Surface Technology (Ministry of Education) School of Materials Science and Engineering Xihua University Chengdu 610039 China School of Mechanical Engineering Dongguan University of Technology Dongguan 523808 China

The synergistic controlling of high densities, fine grain sizes, and low titanium-rich phase content is critical for high sputtering quality of W-Ti refractory alloy targets. In this work, high-performance W-Ti alloy targets have been successfully designed and prepared for the first time by using the dynamic sintering and forging (DSF) integrated method. Compared to hot press (HP) and hot oscillating pressing (HOP), DSF can achieve a relative density of 99.31 % for W-Ti alloys at a lower temperature of 1100 °C (more than 200 °C lower than the above methods). Moreover, its grain size was not grown abnormally and the formation of the Ti-rich phase was suppressed not to be observed. This had never been achieved in previous studies. The DSF integrated method preliminarily achieved the synergistic control of high densities, fine-grain sizes, and low titanium-rich phase content, which achievement provides a technical reference for the preparation of high-performance refractory alloy targets at low temperatures. © 2025 The Authors

关键词： Dynamic sintering and forging integrated method Synergistic controlling Ti-rich phase content W-Ti refractory alloy targets

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Innovative design and optimization of a two-dimensional deployable nine-grid planar antenna mechanism with a flat reflection surface

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Chinese Journal of Aeronautics 2023年第11期36卷 529-550页

作者： Bo CHEN Ze JIANG Xinlu WEI Luyao GUO Xin ZHOU Yundou XU Junjie QIAN Yongsheng ZHAO Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan UniversityQinhuangdao 066004China Key Laboratory of Advanced Forging&Stamping Technology and Science of Ministry of National Education Yanshan UniversityQinhuangdao 066004China Space Structure and Mechanism Technology Laboratory of China Aerospace Science and Technology Group Co.Ltd Shanghai 201109China Aerospace System Engineering Shanghai Shanghai 201109China

With the development of the aerospace industry,space missions are becoming more complicated and diversified,and there is a demand for antenna mechanisms with a larger physical *** this paper,a planar deployable mechanism is proposed,which can form a flat reflection surface with a small gap between *** this end,a novel large-scale two-dimensional deployable nine-grid planar antenna mechanism is ***,two antenna folding schemes and four supporting mechanism schemes are *** comparison analysis,the antenna configuration scheme with the best comprehensive performance is selected.A kinematic model of the deployable mechanism is established,and its kinematic characteristics are ***,the correctness of the kinematic model is verified by comparing the analytical and simulation results of the kinematic ***,a finite element model of the antenna is *** on the response surface method,the structural parameters of the support rods of the antenna are optimized,and a set of optimized solutions with lightweight and high fundamental frequency characteristics are ***,a prototype of the proposed nine-grid planar antenna is *** feasibility of the deployment principle and the rationality of the designed mechanism are verified by deployment experiments.

关键词： Design optimization Kinematics Planar antenna Structural design Two-dimensional expansion

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Study on the health condition monitoring method of hydraulic pump based on convolutional neural network 12

Study on the health condition monitoring method of hydraulic...

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12th International Conference on Measuring technology and Mechatronics Automation, ICMTMA 2020

作者： Sun, Shaowu Sheng, Zhang Jiang, Wanlu Li, Zhenbao Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University Qinhuangdao066004 China

ISBN: (纸本)9781728170817

Aiming at the different health states of hydraulic pumps, this paper proposes to use the convolutional neural network to classify and identify the time-frequency images of different volumetric efficiency of hydraulic pumps to realize the health status monitoring of hydraulic pumps. After collecting the vibration signal data of the hydraulic pump, the time-frequency map is formed by short-time Fourier transform, wavelet transform, and Wigner-Will distribution, and then the generated time-frequency map is divided into a training set and a test set, in which the former is used to train the convolutional neural network and the latter is used to verify the recognition result. Finally, it is proved that the convolutional neural network can well identify the different health states of the hydraulic pump, and the recognition rate reaches 99%. © 2020 IEEE.

关键词： Finite element method

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Roller straightening process and FEM simulation for stainless steel clad plate

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Open Mechanical Engineering Journal 2014年 8卷 557-561页

作者： He-Ong, Jin Ya-Li, Yi Xue-Yan, Han Yan, Liang Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of National Education Yanshan University Qinhuangdao China Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan University Qinhuangdao China School of Mechanical Engineering Yanshan University Qinhuangdao China

Based on elasto-plastic deformation straightening theory and adopting 11 rolls plate straightening mode, the isothermal residual curvature straightening process is proposed for stainless steel clad plate. The straightening mathematical model is established to realize plate shape finishing and stress reforming. By using finite element analysis software, establishing straightening process and determining intermesh, the effects of intermesh on shape and residual stress are analyzed. The results indicate that the straightening process meet the finishing plainness of stainless steel clad plate after rolling. Longitudinal residual stress of the clad plate is evenly distributed across width. The cladding plate and steel substrate are symmetrical and the ascent of stress near the edge is greater. Longitudinal residual stress across length is distributed with the wave of pull-press-pull and the cladding plate and base plate are symmetrical. The above researches are based on the previous theory of the application of stainless steel clad plate straightening technology. © 2014, He-Rong et al.;Licensee Bentham Open.

关键词： Stainless steel

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