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激光裂解技术能够极大改善发动机缸体主轴承座的加工质量并显著提高加工效率.为探寻Nd:YAG激光烧蚀球墨铸铁材料裂解槽的裂解性能,本文基于有限元法成功构建了发动机缸体主轴承座激光裂解加工过程仿真模型,针对QT500-7球墨铸铁主轴承座的裂解参数进行了仿真分析.研究结果表明:在影响裂解质量的三个裂解槽几何参数中,槽深较张角及曲率半径对裂解载荷的影响效应更为明显;裂解载荷随槽深的增加而迅速降低,随槽张角和曲率半径的增加而升高;QT500-7球墨铸铁发动机缸体主轴承座激光裂解加工优化参数应为裂解槽深选为0.5 mm,裂解槽张角选为60°,裂解槽半径选为0.2 mm.有限元模拟分析结果得到了单向拉伸实验结果的验证.本工作通过ABAQUS仿真模拟及大量裂解载荷试验确立了裂解槽几何形状的优化参数,为显著降低裂解载荷和优化裂解工艺提供了数值参考,有利于实现发动机缸体加工的快速发展,从而促进汽车工业实现绿色制造.
Laser pyrolysis technology can greatly improve the machining quality of the engine block main bearing seat and significantly improve the machining efficiency.In order to explore the pyrolysis performance of Nd: YAG laser ablation ductile iron cracked tank, the engine block is successfully constructed based on the finite element method The simulation model of the laser cracking process of the main housing was simulated and the crack parameters of QT500-7 ductile iron main bearing were simulated.The results show that among the geometrical parameters affecting the cracking quality, The influence of radius of curvature on cracking load is more obvious. The cracking load decreases rapidly with the increase of groove depth and increases with the increase of groove opening angle and radius of curvature. The laser cracking of QT500-7 nodular cast iron engine block main bearing The optimization parameters should be 0.5 mm for depth of pyrolysis tank, 60 ° for opening angle of pyrolysis tank and 0.2 mm for radius of pyrolysis tank.The results of uniaxial tensile test are verified by finite element analysis.The results of ABAQUS simulation Simulation and a lot of cracking load tests established the optimization parameters of crack geometry, which provided a numerical reference for significantly reducing the cracking load and optimizing the cracking process, Conducive to the rapid development of the engine block machining, thus contributing to the automotive industry to achieve green manufacturing.