Finite Element Analysis Of Powder Metallurgy Hot Forging Connecting Rod

With the development of our auto industry, powder metallurgy technology is given more attention to. Powder metallurgy (P/M) is a type of little or no machine work technology. P/M can save raw material, work time, energy sources and so on, so it has better economic benefits. Traditional P/M process includes mixing, molding, sintering and aftertreatment, such as coining, forging, heat treatment, machining, oil impregnation. Auto and motor parts are the most P/M ones, and they occupy 60 to 70 percent of whole P/M production.Powder forging is that the perform is forged to part after being heated in die, and it combines P/M with precision forging to improve density and mechanical properties of powder metallurgy parts efficiently. Connecting rod and gear are usually made by powder forging method. As an example of TB50 motor connecting rod, this article describes the process of powder forging include the design of press tool, perform, forge tool and forge technology.As the important part of transferring power in engine, connecting rod is subject to alternating load generated by a variety of complex and periodic tension, pressure and inertial force. To analyze the stress and strain, the finite element method is usually done. The finite element analysis is often used a mathematical method in engineering field now.A three dimensions model of connecting rod has been made and drawn meshes. The body of connecting rod was simplified, the big, small end and transition part were detailed in model and meshes. The load and boundary conditions were determined and the stress was calculated with Abaqus software. From the figures of stress, max tension lies in the notch transition part between big end and body and max pressure lies in the transition part between small end and body. Compared 20 Cr-Mo steel with powder forging, the stress size and safe coefficient are intuitive. Trough calculated the safe coefficient, the safety was discussed of connecting rod. And some factors affected safety coefficient were analyzed, such as smooth finish of surface, carburized, shot and so on.The rod made with powder forging is better in mechanical and technology properties. From finite element calculate and analysis, the conclusion that the powder forging rod can replace the steel rod was deduced.