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Formation Mechanism of Inclusion Defects in Large Forged Pieces

Journal of Iron and Steel Research International 2016年第6期23卷 531-538页

作者： Rong-sheng QI Miao JIN Xin-gang LIU Bao-feng GUO Key Laboratory of Advanced Forging and Stamping Technology and Science of Ministry of Education Yanshan University

Nonmetallic inclusions mixed into large forged metal objects destroy the continuity in the metal and affect the quality of the forged *** on how inclusions affect the plastic deformation of a matrix shows the significance of the formation mechanism of inclusion *** upset forging,the nonlinear finite element model was shown to be appropriate for the ingot hot-forging process by comparing the results with experiments involving plastic and hard inclusions inserted into the forged *** high-temperature stress-strain curves of MnS plastic inclusions were obtained *** results show how,during upsetting,the morphology of MnS plastic inclusions varies from spherical to ellipsoidal,until finally becoming flat in *** larger the inclusion is,the larger the degree of deformation of the inclusion is,and large inclusions enhance the risk of the final product failing to pass inspection for inclusion *** significantly concentrates in the matrix near a hard *** the hard inclusion reaches a certain size,conical fractures form on both sides of the *** pass inclusion-flaw inspection and close hole defects to the extent possible,the flat-anvil upsetting is ***,the inclusiondeformation state obtained by finite element simulation is verified experimentally.

关键词： inclusion inspection anvil spherical destroy continuity forging finally verified ingot

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Research on Active Training Model of Rehabilitation Robot Based on Joint Torque Signal

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IOP Conference Series: Materials Science and Engineering 2019年第7期490卷

作者： Hongbo Wang Hao Yan Yonggan Yan Yungui Li Baoshan Niu Meng Liu Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan University China Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education Yanshan University China Academy for Engineering & Technology Fudan University Shanghai China

This paper constructs a man-machine integrated no-load static model considering the self-balancing of the mechanism, obtains the mapping relationship among joint variable, no-load torque, measured torque and end-force of the patient. According to the damping control strategy, the end force and speed mapping function planning is completed. The joint angular velocities based on the kinematic inverse solution are calculated, which are important parameter of man-machine coupling motion.

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Dynamics analysis and simulation of a new 6-DOF lower limb rehabilitation robot

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IOP Conference Series: Materials Science and Engineering 2019年第6期490卷

作者： Hongbo Wang Musong Lin Yonggan Yan Guowei Liu Bowen Su Chaosheng Zhao Fuhao Wang Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan University Qinhuangdao China Academy for Engineering & Technology Fudan University Shanghai China Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education Yanshan University Qinhuangdao China

This paper proposes a new hybrid (parallel–serial) 6-DOF lower limb rehabilitation robot including two mechanical legs and an adjustable seat, which could train in sitting, lying and standing three postures. Each mechanical leg consists of hip joint, knee joint and ankle joint. The dynamics and DOF of the robot are analysed, and the result is verified by the software ADAMS. The result lay the foundation for prototype build in future.

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On line detection technology of the hardness of cast iron parts based on machine vision

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Jixie Gongcheng Xuebao/Journal of Mechanical Engineering 2017年第1期53卷 157-164页

作者： Shan, Zhongde Zhang, Fei Ren, Yongxin Zhang, Jing Nie, Jungang State Key Laboratory of Advanced Forming Technology and Equipment China Academy of Machinery Science Technology Beijing100083 China

In order to realize online-detection of casting the Brinell hardness, automatic measurement system for the hardness based on machine vision, is applied to collect the Indentation image, to study the algorithm of image filtering, image contour diameter extraction and diameter coefficient calibration. According to the characteristics of the indentation image, a snake model of indentation contour extraction algorithm based on particle swarm is proposed. The indentation diameter calibration coefficient is introduced to solve the conversion relation between the indentation diameter pixels and indentation diameter in the visual measurement, to achieve the least-squares fitting what can improve the measurement accuracy. The online-detection device of the Brinell hardness is used to test 180-210 HBW standard hardness test block. Test shows that the average error is 0.72%, the measurement precision is between ±2 HBW, the standard deviation is 125 HBW, the device has good repeatability and high precision. So the device can meet the online-detection requirement of the hardness of castings. © 2017 Journal of Mechanical Engineering.

关键词： Computer vision

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Study and Implementation of Non-Smooth Weld Identification Based on LabVIEW

Study and Implementation of Non-Smooth Weld Identification B...

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第六届工程机械与车辆工程新进展国际学术会议

作者： Liu Tao Zhang lian-meng Zhang Dan Li wei-jian Zhang xin-yu Hebei Province Laboratory of Heavy Machinery Fluid Power Transmission and Control Key Laboratory of Ministry of Education for Advanced Forging Press Forming Technology and Science

Machine vision is widely used in welding intelligent technology,weld identification is an important prerequisite and *** paper expounds the identification method of non-smooth welds and use

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Auto-establishing simulation parallel manipulators with linear legs and auto-solving their workspaces by utilizing CAD variation geometry

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International Journal of Computers and Applications 2017年第4期39卷 220-233页

作者： Lu, Yi Bi, Cuicui Ye, Nijia Bo, Hu College of Mechanical Engineering Yanshan University Qinhuangdao China Parallel Robot and Mechatronic System Laboratory of Hebei Province Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of National Education Yanshan University QinhuangdaoHebei China Hebei Hanguang Industry CO. LTD Hebei China

A new approach of CAD variation geometry is proposed for automatically establishing the simulation mechanisms of parallel manipulators (PMs) with linear legs, and automatically solving their forward displacements, workspaces, and Euler angles. First, the basic concepts and techniques of the CAD variation geometry are described. Second, a program is developed by utilizing new approach. In the developed software, an interface is constructed for inputting given parameters and outputting solved results of data and graphs, several sub-programs are compiled for automatically establishing various simulation mechanisms, solving the forward displacements, and solving/ displaying reachable workspaces and Euler angles of various PMs. Third, the three novel and five existing different PMs are illustrated. When the given parameters of the PMs into the interface are inputted, their simulation mechanisms are established automatically. The displacements, the reachable workspaces, and the Euler angles are solved automatically. Finally, the solved results of the developed software are verified by that of the analytic solutions of several existing PMs and the simulation solutions of several novel PMs. © 2017 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Geometry

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Study on Double Differential Pressure Dynamic Flowmeter

Study on Double Differential Pressure Dynamic Flowmeter

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第六届工程机械与车辆工程新进展国际学术会议

作者： Liu Tao Yin zhi-gang Zhang lian-meng Zuo zhi-bing Hebei Province Laboratory of Heavy Machinery Fluid Power Transmission and Control Key Laboratory of Ministry of Education for Advanced Forging Press Forming Technology and Science

In the test of electro-hydraulic proportional valve,it is necessary to test the high frequency dynamic flow with *** of the limitation of piston stroke,no load hydraulic cylinder is only suit

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Comfort degree of patients' rehabilitation training based on DSmT theory

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IOP Conference Series: Materials Science and Engineering 2019年第6期490卷

作者： Hongbo Wang Hao Yan Baoshan Niu Xincheng Wang Yafeng Li Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan University Qinhuangdao China Academy for Engineering & Technology Fudan University Shanghai China Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education Yanshan University Qinhuangdao China

This paper aims to solve the problem that most rehabilitation robots lack to integrate their physiological functions and psychological states into closed controlling loop in rehabilitation training of stroke patients. The application of fusion technology of multi-electromechanical sensor signal and DSmT signal is used to achieve patients' comfort judgement. Mean value and variance are used to extract physiological information such as heart rate, temperature and skin resistance. Sensor information of fusion technology of rehabilitation robot based on classical DSmT theory can realize on-line diagnosis of multi-comfort degree of patients' coupling.

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Designing Transformation-Induced Plasticity and Twinning-Induced Plasticity Cr-Co-Ni Medium Entropy Alloys: Theory and Experiment

SSRN

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SSRN 2020年

作者： Yang, Zhibiao Lu, Song Tian, Yanzhong Gu, Zijian Mao, Huahai Sun, Jian Vitos, Levente Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai200240 China Applied Materials Physics Department of Materials Science and Engineering Royal Institute of Technology StockholmSE-100 44 Sweden School of Materials Science and Engineering Northeastern University Shenyang110819 China Unit of Structures Dept Materials Science and Engineering KTH StockholmSE-10044 Sweden Thermo-Calc Software Råsundav. 18 SolnaSE-16767 Sweden Division of Materials Theory Department of Physics and Materials Science Uppsala University P.O. Box 516 UppsalaSE-75120 Sweden Research Institute for Solid State Physics and Optics Wigner Research Center for Physics P.O.Box 49 BudapestH-1525 Hungary

In order to efficiently explore the nearly infinite composition space in multicomponent solid solution alloys, it is important to establish predictive design strategies and use computation-aided methods. In the present work, we demonstrated the density functional theory calculations informed design routes for realizing transformation-induced plasticity (TRIP) and twinning-induced plasticity (TWIP) in Cr-Co-Ni medium entropy alloys (MEAs). We systematically studied the effects of magnetism and chemical composition on the generalized stacking fault energy surface (γ-surface) and showed that both chemistry and the coupled magnetic state strongly affect the γ-surface, consequently, the primary deformation modes. Based on the calculated effective energy barriers for the competing deformation modes, we constructed composition and magnetism dependent deformation maps at both room and cryogenic temperatures. Accordingly, we proposed various design routes for achieving desired primary deformation modes in the ternary Cr-Co-Ni alloys. The deformation mechanisms predicted by our theoretical models are in nice agreement with available experimental observations in literature. Furthermore, we fabricated two non-equiatomic Cr-Co-Ni MEAs possessing the designed TWIP and TRIP effects, showing excellent combinations of tensile strength and ductility. © 2020, The Authors. All rights reserved.

关键词： Nickel alloys

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Designing transformation-induced plasticity and twinning-induced plasticity Cr-Co-Ni medium entropy alloys: Theory and experiment

arXiv

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arXiv 2020年

关键词： Nickel alloys

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