检索结果-南通市图书馆

Recent advances and trends in roll bonding process and bonding model:A review

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2023年第4期36卷 36-74页

作者： Zixuan LI Shahed REZAEI Tao WANG Jianchao HAN xuedao shu Zbigniew PATER Qingxue HUANG College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan 030002China Institute of Materials Science Technische Universita¨t DarmstadtDarmstadt 64287Germany Faculty of Mechanical Engineering&Mechanics Ningbo UniversityNingbo 315211China Faculty of Mechanical Engineering Lublin University of TechnologyLublin20618Poland

This review presents a thorough survey of the roll bonding process with a focus on the bimetallic bars/tubes as well as the bonding models and criteria.The review aims to provide insight into cold,hot and cryogenic bonding mechanisms at the micro and atomic scale and act as a guide for researchers working on roll bonding,other joining processes and bonding simulation.Mean-while,the shortcomings of roll bonding processes are presented from the aspect of formable shapes,while bonding models are shown from the aspect of calculation time,convergence,interface behav-ior of dissimilar materials as well as hot bonding status prediction.Two well-accepted numerical methodologies of bonding models,namely the contact algorithm and cohesive zone model(CZM)of bonding models and in simulations of the bonding process are highlighted.Particularly,recent advances and trends in the application of the combination of mechanical interlocking and metallurgical bonding,special energy fields,gradient structure,novel materials,green technology and soft computing method in the roll bonding process are also discussed.The challenges for advancing and prospects of the roll bonding process and bonding model are presented in an attempt to shed some light on the future research direction.

关键词： Bimetallic Bonding mechanism Bonding model Numerical simulation Roll bonding process

工艺参数对机匣冷态强力旋压力学行为影响规律研究

在线全文

学校读者我要写书评

暂无评论

工程科学与技术 2024年第4期56卷 229-237页

作者：束学道郑家斌刘艳丽徐海洁谢超宁波大学机械工程与力学学院浙江宁波315211 宁波大学浙江省零件轧制成形技术研究重点实验室浙江宁波315211

针对航空钣金机匣材料难于成形,且成形后的产品精度难以控制等问题,本文以高温合金GH3030为材料,在阐明钣金机匣冷态强旋成形回弹理论与载荷作用机制基础上,使用SIMUFACT.FORMING有限元软件,导入实验室之前所得到的GH3030的本构方程,在... 详细信息

针对航空钣金机匣材料难于成形,且成形后的产品精度难以控制等问题,本文以高温合金GH3030为材料,在阐明钣金机匣冷态强旋成形回弹理论与载荷作用机制基础上,使用SIMUFACT.FORMING有限元软件,导入实验室之前所得到的GH3030的本构方程,在软件中建立了航空机匣锥形件冷态强旋的仿真模型,分析了旋轮间隙、旋轮进给比、芯模半锥角等旋压参数对钣金机匣冷态强旋成形回弹与载荷的影响规律;采用正交实验得到了各工艺参数对回弹角度影响的主次规律,并在此基础之上得到最优工艺参数组合;采用BBD(Box-Behnken design)响应曲面设计实验方法,得到旋压过程中最大成形力与旋压参数的量化回归模型,并对回归方程进行方差分析,计算回归方程的多元相关系数、可信度以及精确度。最终结果表明:所得到的模型的可信度和精准度较高;在最终实验结果与仿真结果中取点验证,发现误差在10%以内,因此,回归模型较为精准。最后,进行了旋压实验,对比分析了仿真结果与旋压实验实测结果的回弹角度,其平均误差在6.2%以内,验证了仿真结果及回归模型的可靠性。研究表明:仿真分析的回弹角度与实验测得回弹角度变化趋势几乎相同,并且误差较小,控制在12%以内,表明仿真分析的结果能够较准确地展现旋压件的回弹规律。本文的研究结果为实现高温合金钣金机匣锥形件冷强旋的精确成形提供了理论指导和技术支持。

关键词：钣金机匣高温合金GH3030 冷强旋回弹成形力

CoCrFeNiCu高熵合金涂层的激光熔覆制备及其组织和耐磨性能研究

在线全文

学校读者我要写书评

暂无评论

宁波大学学报（理工版） 2024年第4期37卷 95-102页

作者：章伟束学道邓益民宁波大学机械工程与力学学院浙江宁波315211 浙江省零件轧制成形技术研究重点实验室浙江宁波315211

采用同步送粉的方法在45号钢表面通过激光熔覆制备了CoCrFeNiCu高熵合金涂层,系统探究了激光功率对激光熔覆CoCrFeNiCu高熵合金涂层组织及耐磨性能的影响,利用X射线衍射仪(XRD)、光学显微镜(OM)、扫描电镜(SEM)、电子能谱(EDS)、维氏硬... 详细信息

采用同步送粉的方法在45号钢表面通过激光熔覆制备了CoCrFeNiCu高熵合金涂层,系统探究了激光功率对激光熔覆CoCrFeNiCu高熵合金涂层组织及耐磨性能的影响,利用X射线衍射仪(XRD)、光学显微镜(OM)、扫描电镜(SEM)、电子能谱(EDS)、维氏硬度计、多功能摩擦磨损试验机,对不同功率下高熵合金涂层的组织、相组成结构、力学性能等进行了表征与测试.结果显示,在不同激光功率下,涂层的相结构只有FCC相,表明激光功率并未改变涂层的相组成结构.随着激光功率的增大,涂层顶部由枝晶向胞状晶转变,底部由柱状晶向胞状晶再向柱状晶转变,在1700W下涂层获得的晶粒较均匀致密;随着功率继续增大,晶粒有长大趋势;涂层的显微硬度先升高后降低,在1700W达到最高值202 HV0.2,在1700W下涂层的磨损体积仅有0.03856mm3,耐磨性达到最佳.

关键词：高熵合金激光熔覆微观组织耐磨性

在线全文

学校读者我要写书评

暂无评论

铝合金发动机端盖压铸数值模拟与工艺优化

特种铸造及有色合金 2024年第3期44卷 424-427页

作者：卢信学邓益民束学道孙宝寿李光浩宁波大学机械工程与力学学院宁波315211 浙江省零件轧制成形技术研究重点实验室宁波315211 宁波博大机械有限公司宁波315211

对铝合金发动机后端盖进行了压铸充型凝固过程数值模拟,对可能产生缩孔、缩松的部位进行预测。分析了充型、凝固过程,对冷却水道进行优化,采用正交试验优化了压铸工艺参数:浇注温度为680℃,压射速度为4 m/s,模具预热温度为220℃。用优... 详细信息

对铝合金发动机后端盖进行了压铸充型凝固过程数值模拟,对可能产生缩孔、缩松的部位进行预测。分析了充型、凝固过程,对冷却水道进行优化,采用正交试验优化了压铸工艺参数:浇注温度为680℃,压射速度为4 m/s,模具预热温度为220℃。用优化后的方案进行压铸生产和检测,结果表明压铸件品质得到显著提高。

关键词：铝合金压铸数值模拟正交试验

工艺参数对汽车EGR管件三维弯曲成形质量的影响分析

在线全文

学校读者我要写书评

暂无评论

宁波大学学报（理工版） 2024年第3期37卷 28-35页

作者：何金明白永洁束学道徐海洁宁波大学机械工程与力学学院浙江宁波315211 浙江省零件轧制成形技术研究重点实验室浙江宁波315211 宁波阿能集团浙江宁波315145

为减少汽车废气再循环(Exhaust Gas Recirculation,EGR)管件三维弯曲缺陷,提高成品率,本文建立了304不锈钢本构模型,采用数值仿真与实验相结合方法对模型成形参数中相对壁厚、相对半径对管材的最大主应变、最大壁厚减薄率等影响因素进... 详细信息

为减少汽车废气再循环(Exhaust Gas Recirculation,EGR)管件三维弯曲缺陷,提高成品率,本文建立了304不锈钢本构模型,采用数值仿真与实验相结合方法对模型成形参数中相对壁厚、相对半径对管材的最大主应变、最大壁厚减薄率等影响因素进行探索,分析相对壁厚、相对弯曲半径对管材弯曲过程中成形质量的影响.结果表明,管材在弯曲成形过程中,相对壁厚越小,相对弯曲半径越小,则管材越容易产生裂纹以及失稳起皱等缺陷;随着弯曲角度的增大,管材弯曲最大壁厚减薄率值的增大趋于平缓.对于易发生塑性变形的金属材料,其相对壁厚及相对弯曲半径的取值是否合适是减少其裂纹产生的关键因素.故研究结果可为获得高质量的管件提供理论支撑.

关键词： EGR管件三维弯曲相对壁厚相对弯曲半径

THE 3-D BOUNDARY ELEMENT METHOD OF ROLLER BEARING BY PLATE ELEMENT ANALOGUE

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2001年第3期14卷 268-274页

作者： Shen Guangxian shu xuedao Li Ming Yanshan Univ Dept Mech Engn Qinhuangdao 066004 Peoples R China

The mill roller bearing is made up of an internal ring, middlerolls and an external ring, the analysis of which is a multi-bodiescontact problem. In this paper, based on the three-dimensionalelastic contact BEM without friction, and using the structuralcharacteristics of roller bearings, middle rolls are de- scribed byelastic plate units of different shapes, which is placed on theinternal ring.

关键词： roller bearing traction sub-element method elastic plate element

Grain Boundary Distribution Evolution of 00Cr12Ti FSS during Annealing

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2019年第4期34卷 932-939页

作者：殷安民 WANG Yufan shu xuedao ZHU Zhenge PENG Hao Faculty of Mechanical Engineering & Mechanics Ningbo UniversityNingbo 315211China Part Rolling Key Laboratory of Zhejiang Province Ningbo UniversityNingbo 315211China

The texture and grain boundary of 00Cr12 Ti FSS have a close correlation with properties and should be controlled to optimize the performance of steel sheets. In this paper, the macrotexture evolution during recrystallization annealing was investigated by XRD, the microtexture and grain boundary distribution evolution during recrystallization annealing were investigated by EBSD. The results showed that the γ fiber texture were mainly generated by replacing α fiber texture in recrystallization process. But with the holding time extending,γ fiber texture transferred to other texture after the holding time got to a certain degree. The major CSLs in 00Cr12 Ti FSS after recrystallization are Σ3 and the frequency of Σ3 climb up and then decline with the holding time extending.Σ11 plays an important role in the process of recrystallized γ fiber texture formation.

关键词： ferritic stainless texture evolution grain boundary distribution recrystallization

SELF-ALIGNING EVEN LOAD MECHANISM OF MULTI-ROW BEARINGS OF LARGE STRIP ROLLING MILL

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2006年第2期19卷 246-250页

作者： HUANG Qingxue LI Yugui SHEN Guangxian CHEN Zhanfu shu xuedao SHI Rong ZHA0 Hongwei CHEN Buquan College of Material Engineering Taiyuan University of Science and TechnologyTaiyuan 030024 China Department of Machinery Yanshan UniversityQinhuangdao 066004 China Hot Mill Plant Baoshan I＆S Group Co.Shanghai 200030 China

The load distribution of multi-row bearings of large strip rolling mill is fully analyzed by 3D contact boundary element method （BEM）. It is found out that bearings are frequently worn out due to serious uneven load on the multi-row rollers. The constraint mechanism of the previous rolling system is found to be unreasonable by theoretical analysis on heavy machinery structure. A mechanism of self-aligning even load for workroll bearing of 2 050 mm hot rolling mill of Baoshan I＆S Co. is developed. This device is manufactured with particular regard to the structure of 2 050 mm hot rolling mill mentioned above. Hence, uneven load on multi-row bearings is greatly relieved and their lives are remarkably prolonged. Meanwhile, theoretical analysis and on-spot tests prove the rationality and validity of the device.

关键词： Strip rolling mill Multi-row bearings Loading features

CALCULATION OF MILL RIGIDITY BY THREE DIMENSION CONTACT BOUNDARY ELEMENT METHOD

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2001年第1期14卷 82-85页

作者： shu xuedao Zhang Liandong Shen Gangxian Rolling Mill Institute,Yanshan University Gao Lihua Beiman Special Type Steel Stock Corporation Ltd. 燕山大学轧机研究所河北秦皇岛北满特殊钢股份有限公司黑龙江

Vertical rigidity of the space self adaptive  530 high rigidity mill is calculated by applying the boundary element method (BEM) of three dimension elastic contact problem,which can update the existed deforming separation calculating theory and corresponding methods of material mechanics,elastic mechanics and finite element method.The method has less hypotheses and stronger synthesis in contact type calculating model.The advantages of the method are high calculating rate,high calculating accuracy,etc..

关键词： Mill rigidity Boundary element method Deforming separation Contact type