13th International Conference on the Technology of Plasticity (ICTP 2021): Zhongren Wang Honorary Symposium
Program Organizers: Glenn Daehn, Ohio State University; Libby Culley, The Ohio State University; Anupam Vivek, Ohio State University; Jian Cao, Northwestern University; Brad Kinsey, University of New Hampshire; Erman Tekkaya, TU Dortmund; Yoshinori Yoshida, Gifu University
Monday 10:20 AM
July 26, 2021
Room: Virtual: Room A
Location: Virtual
Session Chair: Shijian Yuan, Harbin Institute of Technology
Professor Z.R. Wang's Contributions to Metal Forming Theory, Technology and Education: Gang Liu1; Shijian Yuan1; Kaifeng Zhang1; 1Harbin Institute of Technology
Prof. Wang once served as the president of the China Society for Technology of Plasticity (CSTP) and hosted the 4th ICTP in Beijing 1993 as Chairman. During 60 years’ academic life on metal forming. He has published 17 books and more than 300 academic papers, has won international and national Awards 5 times, including invention award and science & technology progress award, etc. His main contributions include: developing the engineering plasticity theory and promoting its applications; inventing the die-less hydroforming method for large scale spherical shells; solving the technological problems of several major national projects in China; leading internationalization of Chinese community of plasticity engineering; educating a group of talents on metal forming.
A Study of the Forming Quality of Magnesium Alloy Cylindrical Parts with Inner Ribs by Induction-heating Assisted Spinning: Qinxiang Xia1; Jinchuan Long1; Gaozhu Huang1; Shuai Yuan1; Yi Qin2; 1South China University of Technology; 2University of Strathclyde
Magnesium alloy cylindrical parts with inner ribs (MACPIR) are attractive as lightweight components for improving the performance of high-end equipment in various industrial sectors. Induction-heating assisted spinning (IHAS), an effective way to manufacture cylindrical parts made of difficult-to-deform materials, was used to form the MACPIR. However, when using this process for MACPIR, nonuniform deformation and other forming defects can easily occur between the cylindrical wall and inner ribs. An FEM model of MACPIR during IHAS was developed via ABAQUS, and experimental verification was conducted. Forming defects that occurred during the spinning process of MACPIR were analyzed, and evaluation indexes of forming quality were proposed. The results show that the concavity of rib back, and nonuniform distribution of rib height along tangential and axial directions are the main forming defects. Additionally, the influence of process parameters on the forming quality was discussed. The results indicate that the forming quality of MACPIR can be improved under a forming temperature of T=300~350℃, roller feed rate f=0.4~0.6mm/r and thinning ratio of wall thickness Ψt=65~75%. The simulation results confirm well with experimental ones.
Friction Law in Cold Metal Forming: Zhigang Wang1; Yasuharu Yoshikawa2; Wenzheng Dong1; 1Gifu University; 2Meijo Univeristy
In cold forming, liquid lubricants and lubrication coatings are generally employed. As the basis for understanding of friction behavior under lubricated conditions, the friction law under dry condition is determined based on experimental results in compression of metal sheets by a DLC coated tool. Then the friction law of lubrication coatings is investigated. Finally, the friction law under lubricated conditions is proposed based on the friction law under dry condition and experimental results by the testing method with side stretching and the high pressure friction test.
Adding Value by Advancing Metal Forming: LiLiang Wang1; Trevor Dean2; 1Imperial College London; 2University of Birmingham
The metal forming industry is responding to the changing technical and commercial demands of customers and increasingly stringent legislative restrictions. In addition, lead times are contracting. Also OEMs are demanding deliveries just-in-time on changeable schedules and for many products batch quantities have become smaller than a few years ago. To meet these challenges, in the metal forming industry, the rate at which new and existing process technologies and production practices are being developed is increasing. Computer-aided design and manufacturing systems have been allied to computer process simulation, to form powerful cloud based knowledge-based tools for producing parts right-first-time through identifying the customers' needs. The purpose of this paper is to illustrate some advances made in metal forming industry by the authors, through advancing the base of scientific process knowledge, to meet the demands for added value products.
Recent Advances in Sheet and Tube Hydroforming: Shi-Hong Zhang1; Da-Yong Chen1; Yong Xu1; Yan Ma1; 1Institute of Metal Research, Chinese Academy of Sciences
Pulsating hydroforming and impact hydroforming are two advanced technologies to increase the formability of material compared with other traditional forming technologies. They were systematically investigated from aspects of technical principle, forming mechanism, equipment and applications. Pulsating hydroforming can improve the forming ability by altering the friction condition of sheet/tube parts or by utilizing the effect of transformation induced plasticity of stainless steels under the pulsated loading. As for impact hydroforming, the strain rate can reach 103~104/s and the instantaneous pressure can be GPa level, which can obviously increase the elongation of hard-to-form material by 20%~60%. The effect of flexible liquid and impact impulse was investigated by both experiment and simulation, while the mechanisms are related to the compatible deformation of second phase, strain decentralization and defect stabilization. The technologies have been used on the manufacturing of complex, thin walled components for the fields of aeronautics and aerospace, automobile, nuclear power.
An Improved Hot Stamping Process for Titanium Alloys by Fast Heating: Kehuan Wang1; Gang Liu1; Liliang Wang2; Xiaosong Wang1; 1Harbin Institute of Technology; 2Imperial College London
Titanium alloys are increasingly used in aviation and aerospace industry, but the price of titanium alloys components is always very high, which confines the further applications greatly. Hot stamping of titanium alloys is a young technology but with great potential to reduce the forming cost and improve the forming efficiency for titanium alloys sheet components. In this paper, some progress on hot stamping with furnace heating of titanium alloys achieved in our lab including forming process, microstructure and property evolution and deformation mechanisms are presented firstly. Then both advantages and limitations of this technology are discussed. At the end, a novel hot stamping with fast heating technology is proposed to extend the processing windows.
Rim Thickening of Disk-like Parts Using Spinning: Wang Xinyun1; Jin Junsong1; Deng Lei1; Gong Pan1; Zhang Mao1; 1Huazhong University of Science & Technology
In this study, a multistage spinning process was employed to thicken the rim of a disc-like sheet blank with a uniform thickness. In this process, the workpiece is clamped between the upper spindle and lower spindle, while all of them rotating together. A set of rollers with external grooves, which passively rotate under the drive of friction between the roller and workpiece, feed along the radial direction of the workpiece to compress and thicken the rim in sequence. Based on FEA and experiments, the influences of defects and process parameters on the forming behavior were investigated. Moreover, the effect of preformed shape on the workpiece deformation in the successive stage was also considered. Process parameters were optimized based on flow line distribution.