CuNi90/10铜合金高颈法兰精辗成形数值模拟与试验研究

Numerical simulation and test study on precision rolling of CuNi90/10 copper alloy for high neck flange

高颈法兰的颈部高度和底盘外径大,采用锻造后机加工的方法制作生产效率较低。为提高生产效率,通过对现有辗环工艺进行分析,借助有限元软件建立了高颈法兰精辗模型,并对典型规格的外径Φ159 mm的高颈法兰轧制成形过程进行了仿真分析,研究了驱动辊转速、芯辊进给速度、毛坯形式对高颈法兰轧制成形过程的影响。结果表明:增加驱动辊转速与芯辊进给速度可以减少轧制缺陷,同时采用锥形内孔可以避免内孔产生蝶型缺陷。最终确定了法兰内孔形式为锥形内孔、驱动辊转速ω=5 rad·s^(-1)、芯辊径向进给速度V=3 mm·s^(-1)。最后设计配套模具进行试验验证,完成了典型规格高颈法兰的产品试制,验证了高颈法兰碾环成形工艺的可行性。

The neck height and the outer diameter of chassis for high neck flange are large,and the production efficiency is low by the method of machining after forging.Therefore,in order to improve the production efficiency,through the analysis on the existing ring rolling process,the precision rolling model of the high neck flange was established by finite element software,and the rolling process of the high neck flange with an typical specification of the outer diameter ofΦ159 mm was simulated and analyzed.Then,the influences of rotation speed of drive roller,feeding speed of core roller and blank forms on the rolling process of the high neck flange were investigated.The results show that increasing the rotation speed of drive roller and the feeding speed of core roller can decrease rolling defects,and the use of tapered inner hole can avoid butterfly defects in the inner hole.Finally,the inner hole form of flange is determined as a tapered inner hole,and the rotation speed of drive rollerω=5 rad·s^(-1) and the feeding speed of core roller V=3 mm·s^(-1).Furthermore,a supporting die is designed for test verification,and the trial production of the high neck flange with typical specification is completed to verify the feasibility of the high neck flange rolling process.