열융착 Boss 설계 개선

In case for door trim of car interior, it is assembled with plastic molding parts. There are two methods for assembling two parts with boss. The first method is screw assembling. It put together strongly each part, but it is required more cost and man hour. The second method is hot sticking method by automatic machine. This method is helpful for factory automation, and good for cost reduction, but it has disadvantage of force for taking off plastic molding parts. In this paper, it is investigated improving force of taking off assembled parts with using hot sticking method. In case of requiring low bolting force, it is possible to substitute screw method to hot sticking method. But it is need to have the similar force of screw method in taking off two parts. Now, it is studied design parameter of hot sticking boss to find appropriate height of boss head and height of initial boss height with two case, outer diameter 7.5㎜ and 8.0㎜. It is used FEM by LS-DYNA and simple regression analysis by JMP program to achieve them.