Numerical Simulation Of Extrusion Forming Of Al Alloy T-shaped Rib

T-shape rib of Al alloy is applied to practice production. Adopting tradition cutting method, decrease work efficiency, waste material and intensity of T-shaped rib is not enough. Adopting extrusion forming, T-shaped rib of Al alloy need not to be processed again. Adopting extrusion forming, enhance intensity of T-shaped rib, work efficiency and material using ratio, economy benefit is very high.Adopting 3D finite element simulation software DEF0RM-3D, the simulation is employed to examine the extrusion forming process in T-shaped rib of Al alloy. The effective stress distribution, the effective strain distribution, damage and the load-stroke curve of the whole process are got. It is used to research rule of metal flow, where disfigurement appear in extrusion forming of Al alloy T-shaped rib and the load of extrusion forming.Select temperature, friction coefficient, high-wide ratio of rib, helix angle and width of board parameters, the extrusion process in T-shaped rib is simulated frequently. Based on the simulation result, analyze parameters effect on the extrusion forming process in T-shaped rib. With height of rib accretion, damage of rib is accretion, exterior crack is easy appearance. With width of board accretion, the load of T-shaped rib is also accretion, the load and width of board are linearity connection. Adopting whole loading in T-shaped of width board, there is metal flowing difficulty, excessive high load. It must adopt new technology.Adopting inhibitive local loading in width board T-shape rib, 1/b ( width of punch and width of rib ratio) is low, the metal is shearing deformation, exterior of board is tilted up, the cavity of rib can't be filled with metal entirety. With 1/b accretion, the deformation mode of metal transforms gradually from shearing to extrusion, the height of rib cavity filled enhance gradually. When 1/b is 15, cavity of rib is filled with metal completely, the load is 520KN. It doesn't achieve anticipate decreasing load effect.Adopting nonrestraint local loading in width board T-shaped rib, the width of punch is 9mm, the rib cavity is filled completely, the load which is 102KN is much lower than the load of whole loading which is 930KN. With interim width accretion, clearance of the punch and inhibit board is also accretion, converse extrusion appear in evidence.