DEVELOPMENTS IN HYDRO MECHANICAL FORMING PROCESSES

Abstract

Sheet hydroforming is one of the sheet metal forming processes used in industry to produce complex shapes with high limiting drawing ratio. In sheet metal hydroforming, controlled metal flow during the operation minimizes localized stress concentrations that may cause workpiece buckling or wrinkling. Sheet metal hydroforming is slower than traditional stamping, thus its use is limited to short runs of more highly specialized parts. Hydroforming is an unconventional processes of the metal forming that are used for forming metal sheet and tube thin walled elements, as other spatial elements.Technological forming processes by fluid are deep drawing, stretching, bending, extruding, tube forming. Hydroforming and other actions of plastic forming are based on the laws of plastic theory, balance of forces that are opposite to deformation. The success of hydroforming action depends on the processing parameters are forming force, the force of sheet metal holder, the frame, dimensions of workpiece and friction. Hydroforming analysis at the plasticity area is possible because of actual knowledge application on deformation processing for conventional or unconventional processing as the values of individual parameters can be compared. The fluid pressure intensification pressure system consists of a low-pressure, high flow rate filling system, along with a high pressure intensifier to raise the fluid pressure to forming levels. The forming fluid is water based and contains additives such as lubricants, drying agents and rust preventatives. In this paper presents hydromechanical forming processes.