| dc.description.abstract | This study presents a finite element model of forming tap based on the Deform-3D software. Investigating the thread quality of M1.2 tap on 7075 aluminum alloy, and the influence of tool geometric parameters on the thread fill rate and maximum torque. Therefore, the factors of tool geometry, including tool width, root diameter, front-end diameter, and tooth angle. The result of experiments of internal thread profile and thread fill rate as validation of simulations. Its show that finite element model can deal with internal thread problem. 25 sets of simulation experiments are designed to three levels of each factor according to Box-Behnken design, a type of second-order response surface methodology. Analysis of variance(ANOVA) based on the simulation results established the regression equation of thread fill rate and maximum torque by using Minitab software. Depend on the effect of factors with tool geometry, find out the optimal design to increase thread fill rate, and reduce maximum torque in the thread process. Furthermore, the FEM simulation result has been validated by the regression equation, and establish the analysis model has certain accuracy on the internal thread process. This analysis model is expected to support an optimal tool design for the industry. | en_US |