基于分时模糊控制法的单丝双连杆应力槽线切割加工控制研究

Research on Control of Stress Groove Cutting of Double Connecting Rods with Single Wire Based on Time-sharing Fuzzy Control

研发的单丝双连杆应力槽线切割机床是新一代免穿丝型电火花线切割机床。该机床采用一根电极丝同时对两根连杆的大头孔内表面双侧应力槽进行切割加工,所以伺服控制方法的研究非常关键。在分析双连杆应力槽线切割加工过程的基础上,提出了分时模糊控制法,确保机床能够对两根连杆的应力槽同时加工,提高生产效率。实验表明,该机床能够在20 s内同时完成两根连杆的大头孔内表面双侧应力槽切割加工。与连杆应力槽双向同步电火花线切割机床相比,使用分时模糊控制法后该机床的加工时间更短,槽宽与槽深的控制更精确,实现了预期目标。

The machining tool for stress grooves of double connecting rods with single wire developed in this paper is a new type of wire-free electrical discharge machining(EDM)tool.This machining tool use an electrode wire to cut stress grooves on both sides of the inner surface of the large-end holes of the two connecting rods simultaneously,so the research of servo control method is crucial.Based on the analysis of the cutting process,a time-sharing fuzzy control method is proposed to ensure that the machining tool can cut the stress grooves of the two connecting rods simultaneously,and improve the production efficiency.The experimental results show that the machining tool can complete the double-sided stress groove cutting on the inner surface of the large-end holes of the two connecting rods simultaneously within 20 s.Compared with two-way synchronous wire EDM tool for stress grooves of connecting rods,the machining tool with time-sharing fuzzy control takes less time to complete the stress groove cutting,and the groove width and groove depth are more accurate,which achieves the expected goal.