13th International Conference on the Technology of Plasticity (ICTP 2021): Joining by Forming and Deformation III
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
Wednesday 10:20 AM
July 28, 2021
Room: Virtual: Room B
Location: Virtual
Session Chair: Takashi Kuboki, The University of Electro-Communications
Ultrasonic Forming - Alternative to Orbital Riveting for Small Bimetallic Components: Wojciech Presz1; 1Warsaw University of Technology
The development of electrical equipment has resulted in an increase in the demand for electrical switches, whose key element is contact. The orbital riveting technology has been successfully applied in assembling silver contacts. With the increase of the production, attention has been paid to the possibility of obtaining significant savings by replacing part of the rivet with copper. As a result, bimetallic contacts have been created. It has also proved that the direct transfer of orbital riveting technology from monometallic to bimetallic contacts narrows so much technological window that the cost-effectiveness of the whole process is debatable. One of the factors behind the use of orbital forming is the decisive reduction in friction. A similar effect gives the ultrasonic assistance in microforming processes. Within this work, based on the laboratory experiments results, it was suggested to replace the orbital riveting with ultrasonic riveting in relation to the miniature bimetallic contacts.
Self-piercing Riveting Using Rivets Made of Stainless Steel with High Strain Hardening: Benedikt Uhe1; Clara-Maria Kuball2; Marion Merklein2; Gerson Meschut1; 1Paderborn University; 2Friedrich-Alexander-Universität Erlangen-Nürnberg
Rivets for self-piercing riveting differ in geometry, the material used, the condition of the material and the surface condition. To shorten the manufacturing process, the use of stainless steel with high strain hardening as rivet material is a promising approach. The authors have developed a rivet made of high nitrogen steel 1.3815, which is usable for the self-piercing riveting of challenging material combinations. The focus of the presented investigation is on the deformation behaviour of the rivet during the joining process. The analysis is being made for two material combinations by means of experimental joining tests and numerical simulation. The influences of the rivet geometry and the rivet material on the deformation behaviour are identified and evaluated for conventional rivets of types P and HD2, a rivet with an improved geometry made of treatable steel 38B2 and rivets made of the stainless steels 1.3815 and 1.4541.
Numerical and Experimental Investigations on Riveting Assembly Processing Parameters of Hub Bearing Unit: You Wang1; Wei Xiong1; Jia-hua Zhou2; Peng Ren2; 1Hubei University of Arts and Science; 2Hubei New Torch Technology Co., Ltd
Applying the rotary forging process (RFP) to the shaft-end riveting assembly of hub bearing units (HBU) is an important technological innovation with promising application prospect. Due to its advantages of stable pre-tightening, low cost and high integration, shaft-end riveting assembly have become a vital process in assembling the third generation HBU. However, due to the lack of systematic application research on RFP, there are still gaps between the domestic hub bearings and the imported products especially in terms of accuracy and consistency of performance. In the study, a numerical simulation platform (NSP) was adopted to simulate the assembling processes of HBU, in which the interference assembly, loading and unloading of RFP were simulated with ABAQUS / Standard, ABAQUS / Explicit and ABAQUS / Standard, respectively. The influence of processing parameters on product quality has been carried out by investigating several levels of feed displacement and feed rate, and relevant experimental research has also been conducted. It is found that the experimental results are in consistence with the numerical simulation results, demonstrating that the NSP adopted could be an alternative in determining and optimizing the processing parameters of RFP.
Fabrication of NiAl/TiAl-based Gradient Alloys by Additive Sintering: Dongjun Wang1; Hanwei Ning1; Gang Liu1; 1Harbin Institute of Technology
In this work, aiming at near-net forming and joining of complex shapes for difficult-to-deform alloys, a novel additive sintering route combined with hot pressing sintering (HPS) and powder compact joining for NiAl/TiAl based gradient alloys has been offered, which can break the technical bottleneck of difficult-to-deform alloys and their gradient alloys. The proposed additive sintering can be realized by reheating and holding the powders on the sintered compact samples under pressure，then the complex-shape components can be prepared by repeating the process. The results show that the samples prepared by additive sintering have well-bonded interfaces and the properties at room and high temperatures of the joining region are almost the same as the non-joined samples. Due to the improvement of plasticity for the previous compact sample during additive sintering, the high temperature tensile plasticity in the direction parallel to the interface of the final product has also been improved.
A New Non-destructive Testing Method Applied to Clinching: Remi Lafarge1; Alexander Wolf1; Christina Guilleaume1; Alexander Brosius2; 1TU Dresden; 2Institute of Forming Technology and Lightweight Construction Institute
To pursue better quality, there is a strong need for efficient and robust non-destructive testing methods for joining processes. Wolf et al. Production Engineering, 2019] have proposed a new approach to detect loose bolted joints using acoustic waves. This method measures the dissipation of energy by recording the propagated waves on the surfaces of the joining partners next to the joint. The authors showed a link between the torque moments applied to the bolt and the ability of the joint to transfer acoustic energy using both simulations and experiments.In this article, we numerically investigate the ability to detect variation of some process parameters of the clinching process. To this extent, results of FEM calculation of the joining process are then used to simulate the control method. By varying parameters of the clinching model, their influence on the transmission of energy within the joint is studied.