In this thesis extrusion process of sheet-bulk metal forming is studied. Forward and backward extrusion process is performed on sheet metal through its thickness direction. Sheet extrusion process is aimed to produce integrated parts and sheet thickness change can occur without any secondary operation. DEFORM software is used for computer simulations of forward and backward extrusion, which contains elements generation, boundary conditions of the problem, definition of materials characteristics, model geometry and related parameters. Both closed die and open die extrusion cases were studied. In open die extrusion condition the work piece would be placed on the die without any boundary constraints but in closed die condition raw piece is placed in the die and the boundaries are constraint. Required force on the punch were calculated for both open and closed extrusion cases. In open die case material can flow outside and hence less material is extruded. Forward and backward extrusions were analyzed for different extrusion ratios and punch edge radii and die edge radii their effects on punch force were obtained. The effect of punch and die eccentricity on the punch force was also studied. To validate simulation results, predicted results in forward sheet extrusion process throw its thickness were compared with experimental results obtained from a previous researches. Experimental observations confirmed simulation results. Required force for open die is less than closed die and also work piece height was also less than closed die. By increasing punch edge radius and dies edge radius at the same time, the force used on punch would be decreased and by increasing extrusion ratio the required force on punch increases and also in eccentric punch and die required force on punch increases. Keywords: Sheet-bulk metal forming, Forward and backward extrusion, Uncoaxial punch and die, Extrusion ratio