Alves Luis M, Afonso Rafael M, Silva Frederico L R, Martins Paulo A F
Instituto de Engenharia Mecânica, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
Materials (Basel). 2019 Nov 26;12(23):3909. doi: 10.3390/ma12233909.
This paper is built upon the deformation-assisted joining of sheets to tubes, away from the tube ends, by means of a new process developed by the authors. The process is based on mechanical joining by means of form-fit joints that are obtained by annular squeezing (compression) of the sheet surfaces adjacent to the tubes. The concept is different from the fixing of sheets to tubes by applying direct loading on the tubes, as is currently done in existing deformation-assisted joining solutions. The process is carried out at room temperature and its development is a contribution towards ecological and sustainable manufacturing practices due to savings in material and energy consumption and to easier end-of-life disassembly and recycling when compared to alternative processes based on fastening, riveting, welding and adhesive bonding. The paper is focused on the main process parameters and special emphasis is put on sheet thickness, squeezing depth, and cross-section recess length of the punches. The presentation is supported by experimentation and finite element modelling, and results show that appropriate process parameters should ensure a compromise between the geometry of the mechanical interlocking and the pull-out strength of the new sheet-tube connections.
本文基于作者开发的一种新工艺，该工艺用于在远离管端的位置将板材与管材进行变形辅助连接。该工艺基于通过对管材相邻板材表面进行环形挤压（压缩）获得的形状配合接头进行机械连接。这一概念与现有变形辅助连接解决方案中通过直接对管材施加载荷来将板材固定到管材上的方式不同。该工艺在室温下进行，与基于紧固、铆接、焊接和粘接的替代工艺相比，其发展有助于实现生态和可持续的制造实践，因为可节省材料和能源消耗，并且更易于进行报废拆解和回收利用。本文重点关注主要工艺参数，并特别强调板材厚度、挤压深度和冲头的横截面凹槽长度。通过实验和有限元建模对相关内容进行了阐述，结果表明，合适的工艺参数应确保在机械互锁几何形状与新型板材 - 管材连接的拔出强度之间达成折衷。
