Analysis And Optimization Of Rolling Mechanism For The Round Corner Of Crankshaft

With the rapid development of the automobile industry in our country, The core component of automobile engine crankshaft processing to be concerned. Crankshaft has the characteristics, such as structure and stress state are complex, processing difficulties, bear alternate load largely, the structure parameters and processing technology level affect the whole engine power, reliability and life. In the working status, The operation condition environment of the crankshaft is bad. Crankshaft stress distribution is not uniform, and is alternating stress, the transition way is round between the crank and journal, the region will produce serious stress concentration, so while guaranteeing normal and reliable operation of the engine, at the same time, need to make sure that the crankshaft has enough strength, stiffness and wear resistance.Generally, the basic form of the crankshaft damage is bending fatigue failure and twist fatigue damage, Crankshaft fatigue crack almost all come from the crank to journal transition fillet place, Strengthen the transition fillet can prolong the service life of the crankshaft. At present, the engine crankshaft fillet rolling processing, equipment and key technology are research emphasis of crankshaft processing at home and abroad.This paper is based on rolling clamp body institution for the round corner of crankshaft as the research object, According to the main design requirements of clamp body institution and principles of configuration design, analyze the shortage of QH2—040crankshaft fillet rolling CNC intelligence processing system clamp body institution, put forward the improvement plan, The mechanism consists of clamp body lifting shake block mechanism、pressure motion mechanism、clamp pendulum cylinder mechanism and crank rocker mechanism synthesis mechanism. Then design rolling clamp body institution for the round corner of crankshaft totally and key parts. Use Pro/E for the tool, establish three dimensional model of the whole institution, determine the related technical parameters preliminarily, provide design platform for further analysis. According to the working process of the rolling clamp body institution, Use rod group analysis to divide this complex mechanism into simple single link、RRR double pole group and RPR double pole group institutions, analyze kinematics. Use Pro/e software to assembly the design component, analyze motion interference, to prepare for the kinematics simulation, Motion simulation results analysis correctness and reliability of verify kinematics.Use the analysis tool of ANSYS Workbench, utilize the finite element method to analyze the static of the main component rolling clamp body institution for left and right clamp body, get the stress field、strain field and displacement field, The analysis results show that clamp body institution safety coefficient is very large, also can be further optimization.By using ANSYS Workbench own optimization module to do optimization design for the simplified clamp body model, the input parameter is the height of the two clamp body, the output parameter is the clamp body quality and deformation. The analysis shows that the clamp body has large quality before optimization, It has caused that while rolling the force inertia is very big, and the clamp body deformation is also very big, do optimization design is for the purpose of improving the rolling quality and effect, and get the size and parameters of clamp body model after optimization. The optimization results show that clamp body quality within bounds has decrease widely, and the mechanism entire deformation has reduced a lot, It’s in favor of improving the quality of rolling processing.