Optimization of the Shape of Lip Die in the Extrusion of Plate Wider than the Diameter of the Round Billet using a Lip Die

립(Lip)금형을 이용한 원형 빌렛 직경 이상의 판재압출에서 립금형 형상의 최적화

In the extrusion process, the working material is forced to flow through a die with the desired profile. In general, the width of an extruded section is limited to about an inch less than the diameter of the round billet. But through the lip die, material is spreaded to produce a wider extruded section than the diameter of round billet. In this study, the extrusion process of an aluminum plate using the lip die is investigated. The width of the extruded plate is 450mm that is formed from the round billet with a diameter of 250mm. The flow characteristic through the lip die is considered to produce the wide-extruded plate with a small billet using rigid plastic FE analysis. Based on the result of FE analysis, an optimized design of the lip die is then proposed.