금형의 탄성변형을 고려한 요크 단조공정의 정밀해석

In this paper, non-steady state finite element simulation of a porthole extrusion process for manufacturing a radiation pipe under isothermal assumption is conducted with emphasis on effect of elastic deformation of dies. Effect of die elastic deformation on forming load and deformed shape of material is investigated, revealing that consideration of die elastic deformation is inevitable for precision or optimized die orifice design in extrusion of aluminum bars with complicated cross-sections. It is shown that extrusion simulation considering die elastic deformation is numerically stable, compared with forging simulation. It is, of course, due to steady-state behavior of forming load in extrusion.