Simulasi Perbaikan Desain Proses Pembentukan Tempa Dingin (Cold Forming) Mur M14

Nut and bolt components (fasteners) can be produced through various techniques, including through the forging process. However, in a cold forging process (cold forming) the production of nuts cannot be separated from failures, in the form of defects in cracks on the surface. This failure has an impact on productivity, besides that it can hamper other processes. In this study, the crack defects of SWCH45K carbon steel M14 nuts could be identified visually during inspection. In order to find out the cause of the failure, an analysis was carried out by simulating the cold forming process for the M14 nut according to the existing process variable data using the DEFORM 2D/3D V10.2 program. The simulation results show that the formation at stations 3 and 4 does not fully fill the mold (dies) and high damage to the bearing surface (flange) area, crack defects are caused by high concentrations of stress in the process of forming station 3 because the punch corner does not have a radius (rounding). With the design punch parameters proposed for process improvement, the simulation results for the formation of M14 station 3 and 4 nuts are fully filled, the potential for crack defects decreases.