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In this paper, the finite element method is used to investigate the extrusion process of the straight-fin heat sink in computers. A series of simulations on the straight-fin extrusion using the program DEFORM 2D was carried out. The influences of the process parameters such as straight-fin thickness, straightfin clearance and friction factor between the die and workpiece on the difference of maximum and minimum extruded fin lengths are examined. Fig. 1. A straight-fin heat sink in a computer Fig. 2. The extruded straight-fins with different lengths