摘要：汽车轮胎胎面由许多花纹块和沟槽构成复杂图案,以提供轮胎的各项行驶性能,如牵引性能、制动性能、乘坐舒适性及排水性。轮胎与地面直接接触的面积有明信片大小,造成胎面磨耗的原因是轮胎与地面不可避免的滑动摩擦。轮胎磨耗不仅降低了行驶性能以及缩短轮胎寿命,

摘要：Numerical simulation tech.ology was applied for optimizing th. casting design and conditions in large cast iron castings for marine engine. By th. simulation of mold filling and solidification sequences th. problems of th. previous casting conditions were analyzed and marked improvements for large cylinder liner parts were derived from th.se results. Especially th. amount and positions of ch.lls were optimized to increase th. mech.nical properties and to minimize th. sh.inkage and microporosity in th. castings. Ultrasonic testing, penetration testing and mech.nical property testing were carried out for th. parts with.th. modified casting conditions. It sh.wed th.t no defects in th. castings were found and th. productivity could be distinctly increased. Th. mech.nical properties satisfied also th. specification demanded.