FE-simulation of the Presta joining process for assembled camshafts - local widening of shafts through rolling

18th Chemnitz Seminar on Materials Engineering – 18. Werkstofftechnisches Kolloquium

Scherzer, R.^1 ; Silbermann, C.B.^1 ; Ihlemann, J.^1

Prof. of Solid Mechanics, Technische Universität Chemnitz, Reichenhainer Straße 70, Chemnitz

09126, Germany^1

关键词: Assembled camshafts;    Complex materials;    Hardening mechanism;    Joining process;    Manufacturing methods;    Manufacturing process;    Outer diameters;    Three-dimensional model;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/118/1/012039/pdf
DOI  :  10.1088/1757-899X/118/1/012039

来源: IOP

【 摘 要 】

Considerable weight benefits and the option to combine various steel alloys of the single parts are the major advantages of assembled over conventional camshafts. The Presta joining process is the leading manufacturing method of assembled camshafts in the global market. The process is divided into two substeps. At first, the outer diameter of the shaft is widened with a profile oriented orthogonal to the shaft axis at the intended cam seat. At this position the shaft is subsequently joined with a cam with an internal profile oriented parallel to the shaft axis. As a result, these perpendicular profiles form a tight fit due to plastic deformations. Consequently the simulation of the manufacturing process has to start with the simulation of the rolling of the shaft. The resulting profile requested in this step is axisymmetric, but the arrangement of tools is not. Thus a three-dimensional model is required, which is presented in this work. Furthermore, the infeed of the rolling tool is unknown and controlled by the stiffness of the holders of the rolling tool. This work shows the modeling of this behavior. To predict realistic results for the underlying process, the use of precise material models is essential in order to take several hardening mechanisms into account. However, the use of complex material models implies additional effort, which is shown in this work.