Abstract
Radial forging is a widely used forming process for manufacturing hollow products in transport industry. As the deformation of the workpiece, during the process, is a consequence of a large number of high-speed strokes, the Johnson-Cook constitutive law (taking into account the strain rate) seems to be well adapted for representing the material behavior even if the process is performed under cold conditions. But numerous contributions concerning radial forging analysis, in the literature, are based on a simple elastic-plastic formulation. As far as we know, this assumption has yet not been validated for the radial forging process. Because of the importance of the flow law in the effectiveness of the model, our purpose in this paper is to analyze the influence of the use of an elastic-viscoplastic formulation instead of an elastic-plastic one for modeling the cold radial forging process. In this paper we have selected two different laws for the simulations: the Johnson-Cook and the Ludwik ones, and we have compared the results in terms of forging force, product's thickness, strains, stresses, and CPU time. For the presented study we use an AISI 4140 steel, and we denote a fairly good agreement between the results obtained using both laws.
Highlights
Metal forming is a widely used tool in the industry to manufacture a large range of parts in different sectors
In 1992, Piela [7] has studied the applicability of the finite element method for simulating radial forging process and has proposed his own model in a latter paper in 1997 [8]
Ameli and Movahhedy [11] have proposed a parametric study in cold radial forging process using a finite element model where they analyzed the influence of three parameters on the residual stresses
Summary
Metal forming is a widely used tool in the industry to manufacture a large range of parts in different sectors. In 1992, Piela [7] has studied the applicability of the finite element method for simulating radial forging process and has proposed his own model in a latter paper in 1997 [8]. Domblesky et al [9, 10] have proposed their operating strategy to model multiple-pass radial forging using the finite element method Their approach is based on a stroke by stroke axisymmetric simulation with an automatic update of the die and the workpiece positions between each stroke. Ameli and Movahhedy [11] have proposed a parametric study in cold radial forging process using a finite element model where they analyzed the influence of three parameters (the axial feed, the preform thickness, and the friction coefficient) on the residual stresses. We will compare the Johnson-Cook and the Ludwik constitutive laws in terms of forging force, product thickness, strains, stresses, and CPU time in the last section
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
