钛合金型材拉弯模具仿真分析与优化

Optimization for titanium alloy section mold during stretch-bending

典型型材拉弯过程中因存在回弹而不利于模具的设计制造,通过经验法给出拉弯回弹值并进行修模后,所拉弯成形的零件不符合制造技术要求,需要反复试验且有很大的不确定性,存在制造风险。用有限元仿真技术对钛合金型材进行拉弯变形过程进行仿真分析,结合钛合金材料的特点,归纳分析型材在拉弯变形过程中的参数变化,找出影响拉弯回弹的一些主要因素,从而对拉弯轨迹进行优化,改变了以经验为主的设计模式。通过试验验证,提升了设计效率与可靠性,缩短模具设计制造周期,对成形加工工艺起到很好的推动作用。

Spring-back exists during stretch bending of typical profile,which is unfavorable for the designing and manufacturing of moulds. Even after repairing the moulds by application of empirical method which gives the spring-back value for tension bending,the parts for tension-bending forming are still not in conformity with the manufacturing technical requirements. Also,the repeated testing shall take risks due to great uncertainty titanium alloy section tension-bending forming process was analyzed by means of finite element simulation technology. Parameters variations were analyzed and summarized during stretch bending process in accordance with characteristics of titanium alloy. M ain factors affecting the stretch bending and spring-back were summarized to optimize the stretch-bending locus,which changes the design process based on experience. The experiment shows that the design efficiency and reliability are improved,and the mould design and manufacturing cycle are shortened,which play a great role in promoting the forming processing craft.