增量成形内凸螺旋波纹管研究

目的 研究增量成形螺旋波纹管过程中，工具头的单次压下量与摩擦因数对成形质量和极限的影响规律，优化成形工艺参数。方法 通过ABAQUS有限元模拟和实验相结合，对各个成形工艺参数进行有限元模拟；使用前端直径为8 mm的成形工具头对外径40 mm、壁厚0.8 mm的304不锈钢进行增量成形螺旋波纹管实验研究。结果 不同摩擦因数对成形极限影响较小，对成形质量有较大影响。单次进给量为0.1 mm，摩擦因数为0.02时，螺纹深度极限可以提高10.5%。模拟和实验都验证了工艺参数的合理性。结论 摩擦因数一定的情况下，单次压下量越小，成形力越小，螺纹深度极限越大。

Incremental Forming Internally Convex Spiral Bellows

The paper aims to study influences of single reduction and friction coefficient of tool head on forming quality and limit during incremental forming of spiral corrugated tube, and to optimize parameters of forming process. Through combination of ABAQUS finite element simulation and experiments, finite element simulation of each forming process parameter was performed. The spiral corrugated tube was incrementally formed on 304 stainless steel tube with an outer diameter of 40 mm and a wall thickness of 0.8 mm through a forming tool head with a diameter of 8 mm. Different friction coefficients had few influences on forming limit and had large influences on forming quality. When the single feed rate was 0.1 mm, the thread depth limit could be increased by 10.5% when the friction coefficient was 0.02. Both simulations and experiments verified the rationality of process parameters. When the friction coefficient is constant, the smaller the single feed, the smaller the forming force and the greater the thread depth limit.