| Summary: | 碩士 === 國立中山大學 === 機械與機電工程學系研究所 === 101 === When traditional hydroforming, die fixed and rely the axial feed punch press tube during the forming process, it is inevitable there will be buckling or wrinkling occurs. In addition, between the tube and the die of the forming process will be generated by the frictional force, so that the billet is difficult to flow, resulting in the thickness of the expansion zone is too thin and may fracture, the thickness distribution will be uneven.
Therefore, the concept of the movable die, it can reduce the influence of the frictional force contact between the tube and the die so that the billet during the forming process can be uniformly flow, once a good flowability can be improved even flaring the possibility of the rate of the thickness distribution after deformation due to the good flowability, and the not have thinned phenomenon. This thesis used the concept of movable die design for the local big bulging and all the big bulging hydroforming, and made a loading path for finite element analysis of hydraulic bulging thickness change with or without movable die effect discussed. After simulation results, the actuations of between movable die and punch have to do two phases that can success.
Keywords: tube hydroforming, bucking, wrinkling, movable die, frictional force,
loading path
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