| 摘要 |
PROBLEM TO BE SOLVED: To shorten a period for product development, to reduce cost, and to improve joining strength by converting welding energy obtained by computations into the joining strength of a joined part and obtaining the strength of a joined product. SOLUTION: Analytical model data in which the shape of each injection-molded component is divided into microelements is created. In addition to this microelement data, molding conditions such as injection pressure, mold temperature and the property values of a resin in use such as viscosity, a specific heat ratio are inputted to obtain the state of deformation in each vibration-welded component by injection-molding CAE software. Then stress generated in each microelement at the time of the forceful joining of a welded part is obtained, and further stress generated in each microelement at the time of the addition of load such as internal pressure assumed at the time of use is obtained. Next, the conditions of vibration welding are inputted to compute welding energy generated with the progress of vibration welding by numerical analytical techniques such as finite element method. Then the welding energy is converted into welding strength through the use of a specific equation to obtain welding strength in each microelement of the welded part. Furthermore, the degree of safety in each microelement is obtained by the welding strength and the above-obtained generated stress. |
